ww: rename toolchain to w-prefix + hare-style build/run/test driver

Plan 9-style w-prefix on the per-arch tools, disambiguating from the
real Plan 9 6c/6a/6l in ref/plan9front/:

    cmd/wwc/      → cmd/wcc/        libwwc.a → libwcc.a
    cmd/6{c,a,l}  → cmd/w6{c,a,l}   binary names too
    test/wwc/     → test/wcc/       6 test files w/ w6 prefix
    selfhost/cmd  mirror in lockstep
    bootstrap/amd64/{w6c,w6a,w6l}   snapshot binaries (gitignored)
    WW_6{C,A,L}   → WW_W6{C,A,L}    env-var overrides

Plan 9 source-tree refs ("Plan 9 6c shape", ref/plan9front/, etc.)
preserved. Hare-style driver, both C and ww sides:

    ww test [path]   discover *_test.ww in a directory module, run
                     each; single-file mode for `ww test foo.ww`
    Module-by-name   `ww build foo` resolves to foo.ww or foo/foo.ww
                     via search path (cwd : -I dirs : $WW_LIB)
    Default-to-cwd   `ww build` / `ww test` build the cwd module
    Run pass-through `ww run path arg1 arg2` reaches the program

lib/os: getcwd (79) and getdents64 (217) syscalls power `.` resolution
and directory enumeration on the ww side.

Makefile: wwstage tool deps now include lib/os/os.ww (+ lib/strconv
for wwdump_ww) so lib/* edits force their rebuild instead of leaving
stale binaries — surfaced when test 995 first failed against a stale
w6c_ww built before the lib/os additions.

Test 993 byte-identical parity gate (C-side ww vs ww-side ww_ww on a
build corpus) stays green; all 19 tests pass.

.gitignore

@@ -26,5 +26,5 @@ examples/snake/snake
 # committing them is the v1.0 lock per PLAN.md (the new trust
 # surface). `make bootstrap-snapshot` populates the dir from the
 # current wwstage; `make nocc` verifies they self-reproduce.
-# To ship, `git add -f bootstrap/amd64/{ww,6c,6a,6l}` explicitly.
+# To ship, `git add -f bootstrap/amd64/{ww,w6c,w6a,w6l}` explicitly.
 bootstrap/*/*

BOOTSTRAP.md

@@ -8,11 +8,11 @@ under `selfhost/cmd/` and reach a byte-identical fixed point under
 come from somewhere. Today, that "somewhere" is a small C bootstrap
 toolchain — the **Cstage**:
 
-    cmd/wwc/   frontend library (lex, parse, check)  → libwwc.a
+    cmd/wcc/   frontend library (lex, parse, check)  → libwcc.a
-    cmd/6c/    amd64 compiler   .ww → .s
+    cmd/w6c/    amd64 compiler   .ww → .s
-    cmd/6a/    amd64 assembler  .s  → .o
+    cmd/w6a/    amd64 assembler  .s  → .o
-    cmd/6l/    amd64 linker     .o  → static ELF
+    cmd/w6l/    amd64 linker     .o  → static ELF
-    cmd/ww/    user-facing driver (orchestrates 6c → 6a → 6l)
+    cmd/ww/    user-facing driver (orchestrates w6c → w6a → w6l)
 
 Cstage is built with `cc`. Once it exists, it compiles the
 ww-rewritten tools (the **wwstage**) under `selfhost/cmd/`, which then
@@ -37,7 +37,7 @@ involved.
 ## Make targets
 
     make                builds cstage + wwstage + libs
-    make cstage         Cstage only (cc → ww, 6c, 6a, 6l, wwdump, libs)
+    make cstage         Cstage only (cc → ww, w6c, w6a, w6l, wwdump, libs)
     make wwstage        wwstage only (assumes cstage)
     make bootstrap      three-stage build; gates on cmp ww2 == ww3
     make test           runs all tests, including 990–995 (ww-side
@@ -57,12 +57,12 @@ Without cc:
 ## Status
 
 Phase 10 of `PLAN.md` is at its first exit criterion: the bootstrap is
-green and `selfhost/cmd/{wwc,6c,6a,6l,ww}` are byte-identical to their
+green and `selfhost/cmd/{wcc,w6c,w6a,w6l,ww}` are byte-identical to their
 Cstage counterparts. Test 995 pins the stronger property — the
-wwstage rebuilds every one of its own tools through `ww_ww + 6c_ww +
+wwstage rebuilds every one of its own tools through `ww_ww + w6c_ww +
-6a_ww + 6l_ww`, byte-for-byte. Test 996 pins the equivalent for the
+w6a_ww + w6l_ww`, byte-for-byte. Test 996 pins the equivalent for the
-dynamic linker: `6l_ww` with `-L`/`-l` produces a byte-identical
+dynamic linker: `w6l_ww` with `-L`/`-l` produces a byte-identical
-PT_INTERP+PT_DYNAMIC binary to C-side `6l` on snake.
+PT_INTERP+PT_DYNAMIC binary to C-side `w6l` on snake.
 
 `make nocc` is wired and verifies stage-0 self-reproduction locally;
 the stage-0 binaries under `bootstrap/$(ARCH)/` are gitignored until
@@ -79,12 +79,12 @@ The pieces are already wired; only the binary commit is held back.
 When the compiler stabilises:
 
 1. On each supported arch, run `make wwstage && make bootstrap-snapshot`
-   to populate `bootstrap/<arch>/{ww,6c,6a,6l}` from the current
+   to populate `bootstrap/<arch>/{ww,w6c,w6a,w6l}` from the current
    wwstage. Verify with `make nocc`.
-2. `git add -f bootstrap/<arch>/{ww,6c,6a,6l}` — explicit because
+2. `git add -f bootstrap/<arch>/{ww,w6c,w6a,w6l}` — explicit because
    the dir is gitignored. The binary SHAs become the new trust
    surface.
-3. Delete `cmd/wwc/`, `cmd/6c/`, `cmd/6a/`, `cmd/6l/`, `cmd/ww/`.
+3. Delete `cmd/wcc/`, `cmd/w6c/`, `cmd/w6a/`, `cmd/w6l/`, `cmd/ww/`.
    Drop `CC`/`AR` C-tool dependencies from the top-level Makefile.
 4. Move `selfhost/cmd/*` to `cmd/*` and `make nocc` becomes the
    default `make`.

CLAUDE.md

@@ -13,17 +13,17 @@ This file is the contract for the work. Read PLAN.md for the schedule.
 - Toolchain: Plan 9-organized. One library + one binary per role
   per target architecture. Plan 9 uses a single digit per arch
   (8=386, 6=amd64, 5=arm, 7=arm64, 9=power); we adopt that.
-  - `cmd/wwc/` — frontend library (lex, parse, check). Builds
+  - `cmd/wcc/` — frontend library (lex, parse, check). Builds
-    `libwwc.a`. Not a binary.
+    `libwcc.a`. Not a binary.
-  - `cmd/6c/`  — amd64 compiler. Reads `.ww`, writes `.s`
+  - `cmd/w6c/`  — amd64 compiler. Reads `.ww`, writes `.s`
     (Plan 9 amd64 asm).
-  - `cmd/6a/`  — amd64 assembler. Reads `.s`, writes `.o`
+  - `cmd/w6a/`  — amd64 assembler. Reads `.s`, writes `.o`
     (ELF, for C interop).
-  - `cmd/6l/`  — amd64 linker. Reads `.o` and `.a`, writes a
+  - `cmd/w6l/`  — amd64 linker. Reads `.o` and `.a`, writes a
     static ELF binary.
   - `cmd/ww/`  — user-facing driver (Hare's `hare(1)` /
-    Plan 9's `cc(1)` analogue). Orchestrates `6c → 6a → 6l`.
+    Plan 9's `cc(1)` analogue). Orchestrates `w6c → w6a → w6l`.
-  Adding a new target later means a new triple (e.g. `7c`/`7a`/`7l`
+  Adding a new target later means a new triple (e.g. `w7c`/`w7a`/`w7l`
   for arm64). The frontend library `wwc` is shared.
 
 ## Hard rules (do not violate)
@@ -48,12 +48,12 @@ This file is the contract for the work. Read PLAN.md for the schedule.
    `extern "c"` marker is needed.
 6. **Plan 9 toolchain. No LLVM, no QBE, no external IR.** We do not
    invent a portable SSA IR. We follow Plan 9: the per-target
-   compiler (`6c` for amd64) reads `.ww` and writes Plan 9-style
+   compiler (`w6c` for amd64) reads `.ww` and writes Plan 9-style
-   target assembly (`.s`); the per-target assembler (`6a`) writes
+   target assembly (`.s`); the per-target assembler (`w6a`) writes
-   ELF objects; the per-target linker (`6l`) produces a static
+   ELF objects; the per-target linker (`w6l`) produces a static
    binary. Each tool uses Plan 9 cc's in-memory `Prog`/`Adr`
-   shapes — read `ref/plan9front/sys/src/cmd/cc/`, `cmd/6c/`,
+   shapes — read `ref/plan9front/sys/src/cmd/cc/`, `cmd/w6c/`,
-   `cmd/6a/`, `cmd/6l/` before writing your own.
+   `cmd/w6a/`, `cmd/w6l/` before writing your own.
 7. **No generics, no interfaces, no closures, no lambdas.** Four forms
    of bloat we refuse. Polymorphism, when genuinely needed, is a
    struct of function pointers plus a `ctx: *void` (Plan 9 `Bio`,
@@ -74,7 +74,7 @@ This file is the contract for the work. Read PLAN.md for the schedule.
 8. **Tests run after every change.** `make test` is the truth. A
    change without a green `make test` is not a change.
 9. **Prototype in C, then self-host.** The C bootstrap toolchain
-   (`libwwc`, `6c`, `6a`, `6l`, `ww`) is throwaway scaffolding.
+   (`libwcc`, `w6c`, `w6a`, `w6l`, `ww`) is throwaway scaffolding.
    Its job is to compile enough of `ww` to compile the ww
    reimplementations of itself. Do not over-engineer the C side.
 
@@ -300,7 +300,7 @@ ergonomics live in a sibling pure-`ww` package.
 POSIX `make`, no autotools, no cmake.
 
 ```
-make           # builds libwwc, 6c, 6a, 6l, ww, stdlib
+make           # builds libwcc, w6c, w6a, w6l, ww, stdlib
 make test      # runs all tests (toolchain + stdlib)
 make install   # installs to $PREFIX (default /usr/local)
 make clean
@@ -312,11 +312,11 @@ Target layout under `out/`:
 out/
   bin/
     ww             user-facing driver
-    6c             amd64 compiler
+    w6c             amd64 compiler
-    6a             amd64 assembler
+    w6a             amd64 assembler
-    6l             amd64 linker
+    w6l             amd64 linker
   lib/
-    libwwc.a       frontend library (linked into 6c)
+    libwcc.a       frontend library (linked into w6c)
     libwwrt.a      runtime archive (linked into final binaries)
     <pkg>.a        precompiled stdlib modules
   obj/...          intermediate .s, .o per package
@@ -329,7 +329,7 @@ ELF. Dynamic is `ww build -shared` or per-library `-l`.
 
 Three tiers, all driven by `make test`:
 
-1. **Compiler unit tests** (`test/wwc/`): C, table-driven. Lex, parse,
+1. **Compiler unit tests** (`test/wcc/`): C, table-driven. Lex, parse,
    typecheck, IR-gen, codegen each have their own table.
 2. **Language tests** (`test/lang/*.ww`): each file is a single ww
    program with a comment header declaring expected exit code and
@@ -355,7 +355,7 @@ Every change must:
 
 Applied to this project:
 
-- `6c` is a single-pass-ish recursive-descent parser into a typed
+- `w6c` is a single-pass-ish recursive-descent parser into a typed
   AST, walked into a `Prog` list, then printed as text. No parser
   generator, no LLVM, no SSA pass pipeline.
 - Optimizer is intentionally absent at first. Constant fold + dead
@@ -370,7 +370,7 @@ Applied to this project:
 - `ref/hare/` — the Hare distribution. Read for syntax, FFI
   (`@symbol`), stdlib layout, type names, error idioms.
 - `ref/plan9front/` — 9front. Read `sys/src/cmd/cc/` (the shared
-  frontend library), `sys/src/cmd/8c/` and `sys/src/cmd/6c/` (per-
+  frontend library), `sys/src/cmd/8c/` and `sys/src/cmd/w6c/` (per-
   target compilers), `sys/src/cmd/8a/` (assembler), `sys/src/cmd/8l/`
   (linker) for toolchain organization, `Prog`/`Adr` data shapes,
   mkfile style, and naming.
@@ -404,7 +404,7 @@ When making changes:
   writing code.
 - Keep diffs small. One concern per change.
 - Commits: Plan 9 style. Subject is one short lowercase line,
-  prefixed with the affected area: `6c: fix const fold for i64`,
+  prefixed with the affected area: `w6c: fix const fold for i64`,
   `lib/fmt: handle %v for slices`, `cc: typo`. Body only when the
   why is not obvious from the diff. No `Co-Authored-By` trailer,
   no "Generated with" footer, no emoji.

Makefile

@@ -1,7 +1,7 @@
 # ww — Plan 9-organised toolchain. POSIX make.
 #
-# Build a small static frontend library libwwc.a and the user-facing
+# Build a small static frontend library libwcc.a and the user-facing
-# driver `ww`. Per-target tools (6c, 6a, 6l) and the runtime are added
+# driver `ww`. Per-target tools (w6c, w6a, w6l) and the runtime are added
 # in their own phases. Everything lands under out/.
 
 PREFIX	?= /usr/local
@@ -9,17 +9,17 @@ CC	?= cc
 AR	?= ar
 CFLAGS	?= -O0 -g -Wall -Wextra -Wpedantic -Wno-unused-parameter
 CFLAGS	+= -std=c99 -fno-strict-aliasing -D_POSIX_C_SOURCE=200809L
-INCS	= -Icmd/wwc
+INCS	= -Icmd/wcc
 
 OUT	= out
 BIN	= $(OUT)/bin
 LIB	= $(OUT)/lib
 OBJ	= $(OUT)/obj
 
-WWC_SRC	= cmd/wwc/mem.c cmd/wwc/err.c cmd/wwc/tok.c cmd/wwc/lex.c \
+WCC_SRC	= cmd/wcc/mem.c cmd/wcc/err.c cmd/wcc/tok.c cmd/wcc/lex.c \
-	  cmd/wwc/ast.c cmd/wwc/parse.c cmd/wwc/sym.c cmd/wwc/type.c \
+	  cmd/wcc/ast.c cmd/wcc/parse.c cmd/wcc/sym.c cmd/wcc/type.c \
-	  cmd/wwc/check.c
+	  cmd/wcc/check.c
-WWC_OBJ	= $(WWC_SRC:cmd/wwc/%.c=$(OBJ)/wwc/%.o)
+WCC_OBJ	= $(WCC_SRC:cmd/wcc/%.c=$(OBJ)/wcc/%.o)
 
 WW_SRC	= cmd/ww/main.c
 WW_OBJ	= $(WW_SRC:cmd/ww/%.c=$(OBJ)/ww/%.o)
@@ -27,234 +27,238 @@ WW_OBJ	= $(WW_SRC:cmd/ww/%.c=$(OBJ)/ww/%.o)
 WD_SRC	= cmd/wwdump/main.c
 WD_OBJ	= $(WD_SRC:cmd/wwdump/%.c=$(OBJ)/wwdump/%.o)
 
-C6_SRC	= cmd/6c/main.c cmd/6c/cgen.c cmd/6c/txt.c cmd/6c/swt.c \
+W6C_SRC	= cmd/w6c/main.c cmd/w6c/cgen.c cmd/w6c/txt.c cmd/w6c/swt.c \
-	  cmd/6c/peep.c cmd/6c/reg.c
+	  cmd/w6c/peep.c cmd/w6c/reg.c
-C6_OBJ	= $(C6_SRC:cmd/6c/%.c=$(OBJ)/6c/%.o)
+W6C_OBJ	= $(W6C_SRC:cmd/w6c/%.c=$(OBJ)/w6c/%.o)
 
-A6_SRC	= cmd/6a/main.c cmd/6a/lex.c cmd/6a/parse.c cmd/6a/asm.c cmd/6a/obj.c
+W6A_SRC	= cmd/w6a/main.c cmd/w6a/lex.c cmd/w6a/parse.c cmd/w6a/asm.c cmd/w6a/obj.c
-A6_OBJ	= $(A6_SRC:cmd/6a/%.c=$(OBJ)/6a/%.o)
+W6A_OBJ	= $(W6A_SRC:cmd/w6a/%.c=$(OBJ)/w6a/%.o)
 
-L6_SRC	= cmd/6l/main.c cmd/6l/obj.c cmd/6l/sym.c cmd/6l/pass.c cmd/6l/out.c \
+W6L_SRC	= cmd/w6l/main.c cmd/w6l/obj.c cmd/w6l/sym.c cmd/w6l/pass.c cmd/w6l/out.c \
-	  cmd/6l/dyn.c cmd/6l/dynout.c
+	  cmd/w6l/dyn.c cmd/w6l/dynout.c
-L6_OBJ	= $(L6_SRC:cmd/6l/%.c=$(OBJ)/6l/%.o)
+W6L_OBJ	= $(W6L_SRC:cmd/w6l/%.c=$(OBJ)/w6l/%.o)
 
 RT_S	= rt/start.s rt/syscall.s rt/alloc.s rt/streq.s rt/abort.s
 RT_OBJ	= $(RT_S:rt/%.s=$(OBJ)/rt/%.o)
 
 # Cstage: one-time C bootstrap (see BOOTSTRAP.md). Built by `cc`.
 # Goes away at v1.0, replaced by a checked-in stage-0 binary.
-CSTAGE_BINS	= $(BIN)/ww $(BIN)/6c $(BIN)/6a $(BIN)/6l $(BIN)/wwdump
+CSTAGE_BINS	= $(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l $(BIN)/wwdump
 
 # Wwstage: ww-rewritten toolchain. Built by Cstage today; will be the
 # only toolchain after Phase 10 closeout. Byte-identical to Cstage
 # (tests 990-994).
-WWSTAGE_BINS	= $(BIN)/wwdump_ww $(BIN)/6c_ww $(BIN)/6a_ww $(BIN)/6l_ww $(BIN)/ww_ww
+WWSTAGE_BINS	= $(BIN)/wwdump_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww $(BIN)/ww_ww
 
 BINS	= $(CSTAGE_BINS) $(WWSTAGE_BINS)
-LIBS	= $(LIB)/libwwc.a $(LIB)/libwwrt.a
+LIBS	= $(LIB)/libwcc.a $(LIB)/libwwrt.a
 
 all: cstage wwstage
 
 cstage: $(CSTAGE_BINS) $(LIBS)
 wwstage: $(WWSTAGE_BINS)
 
-# ---- libwwc.a ----------------------------------------------------------
+# ---- libwcc.a ----------------------------------------------------------
-$(LIB)/libwwc.a: $(WWC_OBJ) | $(LIB)
+$(LIB)/libwcc.a: $(WCC_OBJ) | $(LIB)
-	$(AR) rcs $@ $(WWC_OBJ)
+	$(AR) rcs $@ $(WCC_OBJ)
 
-$(OBJ)/wwc/%.o: cmd/wwc/%.c cmd/wwc/ww.h | $(OBJ)/wwc
+$(OBJ)/wcc/%.o: cmd/wcc/%.c cmd/wcc/ww.h | $(OBJ)/wcc
 	$(CC) $(CFLAGS) $(INCS) -c -o $@ $<
 
 # ---- ww driver ---------------------------------------------------------
-$(BIN)/ww: $(WW_OBJ) $(LIB)/libwwc.a | $(BIN)
+$(BIN)/ww: $(WW_OBJ) $(LIB)/libwcc.a | $(BIN)
-	$(CC) $(CFLAGS) -o $@ $(WW_OBJ) -L$(LIB) -lwwc
+	$(CC) $(CFLAGS) -o $@ $(WW_OBJ) -L$(LIB) -lwcc
 
-$(OBJ)/ww/%.o: cmd/ww/%.c cmd/wwc/ww.h | $(OBJ)/ww
+$(OBJ)/ww/%.o: cmd/ww/%.c cmd/wcc/ww.h | $(OBJ)/ww
 	$(CC) $(CFLAGS) $(INCS) -c -o $@ $<
 
 # ---- wwdump (lex/AST diff anchor) --------------------------------------
-$(BIN)/wwdump: $(WD_OBJ) $(LIB)/libwwc.a | $(BIN)
+$(BIN)/wwdump: $(WD_OBJ) $(LIB)/libwcc.a | $(BIN)
-	$(CC) $(CFLAGS) -o $@ $(WD_OBJ) -L$(LIB) -lwwc
+	$(CC) $(CFLAGS) -o $@ $(WD_OBJ) -L$(LIB) -lwcc
 
-$(OBJ)/wwdump/%.o: cmd/wwdump/%.c cmd/wwc/ww.h | $(OBJ)/wwdump
+$(OBJ)/wwdump/%.o: cmd/wwdump/%.c cmd/wcc/ww.h | $(OBJ)/wwdump
 	$(CC) $(CFLAGS) $(INCS) -c -o $@ $<
 
-# ---- 6c amd64 compiler -------------------------------------------------
+# ---- w6c amd64 compiler ------------------------------------------------
-$(BIN)/6c: $(C6_OBJ) $(LIB)/libwwc.a | $(BIN)
+$(BIN)/w6c: $(W6C_OBJ) $(LIB)/libwcc.a | $(BIN)
-	$(CC) $(CFLAGS) -o $@ $(C6_OBJ) -L$(LIB) -lwwc
+	$(CC) $(CFLAGS) -o $@ $(W6C_OBJ) -L$(LIB) -lwcc
 
-$(OBJ)/6c/%.o: cmd/6c/%.c cmd/6c/gc.h cmd/6c/6.out.h cmd/wwc/ww.h | $(OBJ)/6c
+$(OBJ)/w6c/%.o: cmd/w6c/%.c cmd/w6c/gc.h cmd/w6c/6.out.h cmd/wcc/ww.h | $(OBJ)/w6c
-	$(CC) $(CFLAGS) $(INCS) -Icmd/6c -c -o $@ $<
+	$(CC) $(CFLAGS) $(INCS) -Icmd/w6c -c -o $@ $<
 
-# ---- 6a amd64 assembler ------------------------------------------------
+# ---- w6a amd64 assembler -----------------------------------------------
-$(BIN)/6a: $(A6_OBJ) | $(BIN)
+$(BIN)/w6a: $(W6A_OBJ) | $(BIN)
-	$(CC) $(CFLAGS) -o $@ $(A6_OBJ)
+	$(CC) $(CFLAGS) -o $@ $(W6A_OBJ)
 
-$(OBJ)/6a/%.o: cmd/6a/%.c cmd/6a/a.h cmd/6c/6.out.h | $(OBJ)/6a
+$(OBJ)/w6a/%.o: cmd/w6a/%.c cmd/w6a/a.h cmd/w6c/6.out.h | $(OBJ)/w6a
-	$(CC) $(CFLAGS) -Icmd/6a -Icmd/6c -c -o $@ $<
+	$(CC) $(CFLAGS) -Icmd/w6a -Icmd/w6c -c -o $@ $<
 
-# ---- 6l amd64 linker ---------------------------------------------------
+# ---- w6l amd64 linker --------------------------------------------------
-$(BIN)/6l: $(L6_OBJ) | $(BIN)
+$(BIN)/w6l: $(W6L_OBJ) | $(BIN)
-	$(CC) $(CFLAGS) -o $@ $(L6_OBJ)
+	$(CC) $(CFLAGS) -o $@ $(W6L_OBJ)
 
-$(OBJ)/6l/%.o: cmd/6l/%.c cmd/6l/l.h | $(OBJ)/6l
+$(OBJ)/w6l/%.o: cmd/w6l/%.c cmd/w6l/l.h | $(OBJ)/w6l
-	$(CC) $(CFLAGS) -Icmd/6l -c -o $@ $<
+	$(CC) $(CFLAGS) -Icmd/w6l -c -o $@ $<
 
 # ---- ww-side wwdump (the lexer port, exercised by 990_selfhost) --------
-# Built via the user-facing ww driver, with -I selfhost/cmd/wwc so it
+# Built via the user-facing ww driver, with -I selfhost/cmd/wcc so it
 # can find the lex/tok/mem ports. Output named wwdump_ww to avoid
 # colliding with the C-side wwdump in $(BIN).
 $(BIN)/wwdump_ww: selfhost/cmd/wwdump/main.ww \
-		selfhost/cmd/wwc/lex.ww selfhost/cmd/wwc/tok.ww \
+		selfhost/cmd/wcc/lex.ww selfhost/cmd/wcc/tok.ww \
-		selfhost/cmd/wwc/mem.ww selfhost/cmd/wwc/ast.ww \
+		selfhost/cmd/wcc/mem.ww selfhost/cmd/wcc/ast.ww \
-		selfhost/cmd/wwc/parse.ww selfhost/cmd/wwc/typ.ww \
+		selfhost/cmd/wcc/parse.ww selfhost/cmd/wcc/typ.ww \
-		selfhost/cmd/wwc/sym.ww selfhost/cmd/wwc/check.ww \
+		selfhost/cmd/wcc/sym.ww selfhost/cmd/wcc/check.ww \
-		selfhost/cmd/wwc/cgen.ww \
+		selfhost/cmd/wcc/cgen.ww \
-		$(BIN)/ww $(BIN)/6c $(BIN)/6a $(BIN)/6l \
+		lib/os/os.ww lib/strconv/strconv.ww \
+		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(LIB)/libwwrt.a | $(BIN)
-	cd $(BIN) && ./ww build -I $$PWD/../../selfhost/cmd/wwc \
+	cd $(BIN) && ./ww build -I $$PWD/../../selfhost/cmd/wcc \
 		$$PWD/../../selfhost/cmd/wwdump/main.ww
 	mv $(BIN)/main $@
 
-# ---- ww-side 6c (compiler port, exercised by 994_6c_ww) ----------------
+# ---- ww-side w6c (compiler port, exercised by 994_w6c_ww) -------------
-# Thin driver: parse + cgen, both already living in selfhost/cmd/wwc.
+# Thin driver: parse + cgen, both already living in selfhost/cmd/wcc.
 # Build through `ww build` like the other wwstage tools.
-$(BIN)/6c_ww: selfhost/cmd/6c/main.ww \
+$(BIN)/w6c_ww: selfhost/cmd/w6c/main.ww \
-		selfhost/cmd/wwc/lex.ww selfhost/cmd/wwc/tok.ww \
+		selfhost/cmd/wcc/lex.ww selfhost/cmd/wcc/tok.ww \
-		selfhost/cmd/wwc/mem.ww selfhost/cmd/wwc/ast.ww \
+		selfhost/cmd/wcc/mem.ww selfhost/cmd/wcc/ast.ww \
-		selfhost/cmd/wwc/parse.ww selfhost/cmd/wwc/typ.ww \
+		selfhost/cmd/wcc/parse.ww selfhost/cmd/wcc/typ.ww \
-		selfhost/cmd/wwc/sym.ww selfhost/cmd/wwc/check.ww \
+		selfhost/cmd/wcc/sym.ww selfhost/cmd/wcc/check.ww \
-		selfhost/cmd/wwc/cgen.ww \
+		selfhost/cmd/wcc/cgen.ww \
-		$(BIN)/ww $(BIN)/6c $(BIN)/6a $(BIN)/6l \
+		lib/os/os.ww \
+		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(LIB)/libwwrt.a | $(BIN)
-	cd $(BIN) && ./ww build -I $$PWD/../../selfhost/cmd/wwc \
+	cd $(BIN) && ./ww build -I $$PWD/../../selfhost/cmd/wcc \
-		$$PWD/../../selfhost/cmd/6c/main.ww
+		$$PWD/../../selfhost/cmd/w6c/main.ww
 	mv $(BIN)/main $@
 
-# ---- ww-side 6a (assembler port, exercised by 991_6a_ww) ---------------
+# ---- ww-side w6a (assembler port, exercised by 991_w6a_ww) ------------
-# Built like wwdump_ww. Needs -I selfhost/cmd/6a for the local types/lex/
+# Built like wwdump_ww. Needs -I selfhost/cmd/w6a for the local types/lex/
-# parse/asm/obj modules and -I selfhost/cmd/wwc to find `mem`.
+# parse/asm/obj modules and -I selfhost/cmd/wcc to find `mem`.
-$(BIN)/6a_ww: selfhost/cmd/6a/main.ww selfhost/cmd/6a/types.ww \
+$(BIN)/w6a_ww: selfhost/cmd/w6a/main.ww selfhost/cmd/w6a/types.ww \
-		selfhost/cmd/6a/lex.ww selfhost/cmd/6a/parse.ww \
+		selfhost/cmd/w6a/lex.ww selfhost/cmd/w6a/parse.ww \
-		selfhost/cmd/6a/asm.ww selfhost/cmd/6a/obj.ww \
+		selfhost/cmd/w6a/asm.ww selfhost/cmd/w6a/obj.ww \
-		selfhost/cmd/wwc/mem.ww \
+		selfhost/cmd/wcc/mem.ww \
-		$(BIN)/ww $(BIN)/6c $(BIN)/6a $(BIN)/6l \
+		lib/os/os.ww \
+		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(LIB)/libwwrt.a | $(BIN)
 	cd $(BIN) && ./ww build \
-		-I $$PWD/../../selfhost/cmd/6a \
+		-I $$PWD/../../selfhost/cmd/w6a \
-		-I $$PWD/../../selfhost/cmd/wwc \
+		-I $$PWD/../../selfhost/cmd/wcc \
-		$$PWD/../../selfhost/cmd/6a/main.ww
+		$$PWD/../../selfhost/cmd/w6a/main.ww
 	mv $(BIN)/main $@
 
-# ---- ww-side 6l (linker port, exercised by 992_6l_ww) ------------------
+# ---- ww-side w6l (linker port, exercised by 992_w6l_ww) ---------------
-# Built like 6a_ww. Needs -I selfhost/cmd/6l for the local sym/obj/pass/
+# Built like 6a_ww. Needs -I selfhost/cmd/w6l for the local sym/obj/pass/
-# out modules and -I selfhost/cmd/wwc to find `mem`.
+# out modules and -I selfhost/cmd/wcc to find `mem`.
-$(BIN)/6l_ww: selfhost/cmd/6l/main.ww selfhost/cmd/6l/sym.ww \
+$(BIN)/w6l_ww: selfhost/cmd/w6l/main.ww selfhost/cmd/w6l/sym.ww \
-		selfhost/cmd/6l/obj.ww selfhost/cmd/6l/dyn.ww \
+		selfhost/cmd/w6l/obj.ww selfhost/cmd/w6l/dyn.ww \
-		selfhost/cmd/6l/pass.ww selfhost/cmd/6l/dynout.ww \
+		selfhost/cmd/w6l/pass.ww selfhost/cmd/w6l/dynout.ww \
-		selfhost/cmd/6l/out.ww selfhost/cmd/wwc/mem.ww \
+		selfhost/cmd/w6l/out.ww selfhost/cmd/wcc/mem.ww \
-		$(BIN)/ww $(BIN)/6c $(BIN)/6a $(BIN)/6l \
+		lib/os/os.ww \
+		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(LIB)/libwwrt.a | $(BIN)
 	cd $(BIN) && ./ww build \
-		-I $$PWD/../../selfhost/cmd/6l \
+		-I $$PWD/../../selfhost/cmd/w6l \
-		-I $$PWD/../../selfhost/cmd/wwc \
+		-I $$PWD/../../selfhost/cmd/wcc \
-		$$PWD/../../selfhost/cmd/6l/main.ww
+		$$PWD/../../selfhost/cmd/w6l/main.ww
 	mv $(BIN)/main $@
 
 # ---- ww-side ww driver (exercised by 993_ww_ww) ------------------------
-# The driver pulls in lib/os (default search path) and selfhost/cmd/wwc
+# The driver pulls in lib/os (default search path) and selfhost/cmd/wcc
-# (for the bump arena). It then orchestrates 6c/6a/6l like the C driver.
+# (for the bump arena). It then orchestrates w6c/w6a/w6l like the C driver.
-$(BIN)/ww_ww: selfhost/cmd/ww/main.ww selfhost/cmd/wwc/mem.ww lib/os/os.ww \
+$(BIN)/ww_ww: selfhost/cmd/ww/main.ww selfhost/cmd/wcc/mem.ww lib/os/os.ww \
-		$(BIN)/ww $(BIN)/6c $(BIN)/6a $(BIN)/6l \
+		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(LIB)/libwwrt.a | $(BIN)
 	cd $(BIN) && ./ww build \
-		-I $$PWD/../../selfhost/cmd/wwc \
+		-I $$PWD/../../selfhost/cmd/wcc \
 		$$PWD/../../selfhost/cmd/ww/main.ww
 	mv $(BIN)/main $@
 
-# ---- runtime (libwwrt.a, assembled by our own 6a) ----------------------
+# ---- runtime (libwwrt.a, assembled by our own w6a) ---------------------
-$(OBJ)/rt/%.o: rt/%.s $(BIN)/6a | $(OBJ)/rt
+$(OBJ)/rt/%.o: rt/%.s $(BIN)/w6a | $(OBJ)/rt
-	$(BIN)/6a -o $@ $<
+	$(BIN)/w6a -o $@ $<
 
 $(LIB)/libwwrt.a: $(RT_OBJ) | $(LIB)
 	$(AR) rcs $@ $(RT_OBJ)
 
 # ---- directories -------------------------------------------------------
-$(BIN) $(LIB) $(OBJ)/wwc $(OBJ)/ww $(OBJ)/wwdump $(OBJ)/6c $(OBJ)/6a $(OBJ)/6l $(OBJ)/rt:
+$(BIN) $(LIB) $(OBJ)/wcc $(OBJ)/ww $(OBJ)/wwdump $(OBJ)/w6c $(OBJ)/w6a $(OBJ)/w6l $(OBJ)/rt:
 	mkdir -p $@
 
 # ---- tests -------------------------------------------------------------
 # Each phase adds a $(BIN)/test_<name> target; the runner walks them.
 TESTS	= $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
-	  $(BIN)/test_6c $(BIN)/test_6a $(BIN)/test_6l $(BIN)/test_arch \
+	  $(BIN)/test_w6c $(BIN)/test_w6a $(BIN)/test_w6l $(BIN)/test_arch \
 	  $(BIN)/test_e2e $(BIN)/test_ffi $(BIN)/test_dyn $(BIN)/test_stdlib \
-	  $(BIN)/test_selfhost $(BIN)/test_6a_ww $(BIN)/test_6l_ww \
+	  $(BIN)/test_selfhost $(BIN)/test_w6a_ww $(BIN)/test_w6l_ww \
-	  $(BIN)/test_6c_ww $(BIN)/test_ww_ww $(BIN)/test_self_rebuild \
+	  $(BIN)/test_w6c_ww $(BIN)/test_ww_ww $(BIN)/test_self_rebuild \
 	  $(BIN)/test_dyn_ww
 
-$(BIN)/test_smoke: test/wwc/000_smoke.c $(LIB)/libwwc.a | $(BIN)
+$(BIN)/test_smoke: test/wcc/000_smoke.c $(LIB)/libwcc.a | $(BIN)
-	$(CC) $(CFLAGS) $(INCS) -o $@ $< -L$(LIB) -lwwc
+	$(CC) $(CFLAGS) $(INCS) -o $@ $< -L$(LIB) -lwcc
 
-$(BIN)/test_lex: test/wwc/100_lex.c $(LIB)/libwwc.a | $(BIN)
+$(BIN)/test_lex: test/wcc/100_lex.c $(LIB)/libwcc.a | $(BIN)
-	$(CC) $(CFLAGS) $(INCS) -o $@ $< -L$(LIB) -lwwc
+	$(CC) $(CFLAGS) $(INCS) -o $@ $< -L$(LIB) -lwcc
 
-$(BIN)/test_parse: test/wwc/200_parse.c $(LIB)/libwwc.a | $(BIN)
+$(BIN)/test_parse: test/wcc/200_parse.c $(LIB)/libwcc.a | $(BIN)
-	$(CC) $(CFLAGS) $(INCS) -o $@ $< -L$(LIB) -lwwc
+	$(CC) $(CFLAGS) $(INCS) -o $@ $< -L$(LIB) -lwcc
 
-$(BIN)/test_check: test/wwc/300_check.c $(LIB)/libwwc.a | $(BIN)
+$(BIN)/test_check: test/wcc/300_check.c $(LIB)/libwcc.a | $(BIN)
-	$(CC) $(CFLAGS) $(INCS) -o $@ $< -L$(LIB) -lwwc
+	$(CC) $(CFLAGS) $(INCS) -o $@ $< -L$(LIB) -lwcc
 
-$(BIN)/test_6c: test/wwc/400_6c.c $(BIN)/6c | $(BIN)
+$(BIN)/test_w6c: test/wcc/400_w6c.c $(BIN)/w6c | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_6a: test/wwc/500_6a.c $(BIN)/6c $(BIN)/6a | $(BIN)
+$(BIN)/test_w6a: test/wcc/500_w6a.c $(BIN)/w6c $(BIN)/w6a | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_6l: test/wwc/600_6l.c $(BIN)/6c $(BIN)/6a $(BIN)/6l | $(BIN)
+$(BIN)/test_w6l: test/wcc/600_w6l.c $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_arch: test/wwc/610_arch.c $(BIN)/6c $(BIN)/6a $(BIN)/6l \
+$(BIN)/test_arch: test/wcc/610_arch.c $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(OBJ)/rt/start.o | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_e2e: test/wwc/700_e2e.c $(BIN)/ww $(BIN)/6c $(BIN)/6a $(BIN)/6l \
+$(BIN)/test_e2e: test/wcc/700_e2e.c $(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(LIB)/libwwrt.a $(OBJ)/rt/start.o | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_ffi: test/wwc/800_ffi.c $(BIN)/6c | $(BIN)
+$(BIN)/test_ffi: test/wcc/800_ffi.c $(BIN)/w6c | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_dyn: test/wwc/810_dyn.c $(BIN)/ww $(BIN)/6c $(BIN)/6a $(BIN)/6l \
+$(BIN)/test_dyn: test/wcc/810_dyn.c $(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(LIB)/libwwrt.a | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_stdlib: test/wwc/900_stdlib.c $(BIN)/6c | $(BIN)
+$(BIN)/test_stdlib: test/wcc/900_stdlib.c $(BIN)/w6c | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_selfhost: test/wwc/990_selfhost.c $(BIN)/6c $(BIN)/6a $(BIN)/6l \
+$(BIN)/test_selfhost: test/wcc/990_selfhost.c $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(BIN)/ww $(BIN)/wwdump $(BIN)/wwdump_ww $(LIB)/libwwrt.a | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_6a_ww: test/wwc/991_6a_ww.c $(BIN)/6a $(BIN)/6a_ww | $(BIN)
+$(BIN)/test_w6a_ww: test/wcc/991_w6a_ww.c $(BIN)/w6a $(BIN)/w6a_ww | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_6l_ww: test/wwc/992_6l_ww.c $(BIN)/6l $(BIN)/6l_ww \
+$(BIN)/test_w6l_ww: test/wcc/992_w6l_ww.c $(BIN)/w6l $(BIN)/w6l_ww \
 		$(LIB)/libwwrt.a | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_6c_ww: test/wwc/994_6c_ww.c $(BIN)/6c_ww $(BIN)/wwdump_ww | $(BIN)
+$(BIN)/test_w6c_ww: test/wcc/994_w6c_ww.c $(BIN)/w6c_ww $(BIN)/wwdump_ww | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_ww_ww: test/wwc/993_ww_ww.c $(BIN)/ww $(BIN)/ww_ww \
+$(BIN)/test_ww_ww: test/wcc/993_ww_ww.c $(BIN)/ww $(BIN)/ww_ww \
-		$(BIN)/6c $(BIN)/6a $(BIN)/6l $(LIB)/libwwrt.a | $(BIN)
+		$(BIN)/w6c $(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_self_rebuild: test/wwc/995_self_rebuild.c $(BIN)/ww_ww \
+$(BIN)/test_self_rebuild: test/wcc/995_self_rebuild.c $(BIN)/ww_ww \
-		$(BIN)/6c_ww $(BIN)/6a_ww $(BIN)/6l_ww $(BIN)/wwdump_ww \
+		$(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww $(BIN)/wwdump_ww \
 		$(LIB)/libwwrt.a | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_dyn_ww: test/wwc/996_dyn_ww.c $(BIN)/ww $(BIN)/6l $(BIN)/6l_ww \
+$(BIN)/test_dyn_ww: test/wcc/996_dyn_ww.c $(BIN)/ww $(BIN)/w6l $(BIN)/w6l_ww \
 		$(LIB)/libwwrt.a | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
@@ -264,7 +268,7 @@ test: all $(TESTS)
 install: all
 	mkdir -p $(PREFIX)/bin $(PREFIX)/lib
 	cp $(BIN)/ww $(PREFIX)/bin/
-	cp $(LIB)/libwwc.a $(PREFIX)/lib/
+	cp $(LIB)/libwcc.a $(PREFIX)/lib/
 
 clean:
 	rm -rf $(OUT)
@@ -272,8 +276,8 @@ clean:
 # ---- bootstrap (phase 10) ----------------------------------------------
 # Four-stage self-host: Cstage (these C tools) → ww1 → ww2 → ww3 → ww4
 # with cmp ww2 == ww3 and cmp ww3 == ww4. Stage 1 is wwdump_ww (the
-# ww-built frontend); stages 2/3/4 assemble with 6a_ww and link with
+# ww-built frontend); stages 2/3/4 assemble with w6a_ww and link with
-# 6l_ww — every tool below the driver is now in ww. The C `ww` driver
+# w6l_ww — every tool below the driver is now in ww. The C `ww` driver
 # still orchestrates the pipeline (porting it is the remaining phase-10
 # work).
 #
@@ -284,28 +288,28 @@ clean:
 BS	= $(OUT)/bootstrap
 bootstrap: all
 	@echo "=== stage 0 (Cstage): C-built tools ==="
-	@echo "  $(BIN)/ww $(BIN)/6c $(BIN)/6a $(BIN)/6l"
+	@echo "  $(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l"
 	@echo
 	@echo "=== stage 1: ww-built tools, used to drive stages 2/3/4 ==="
-	@ls -l $(BIN)/wwdump_ww $(BIN)/6a_ww $(BIN)/6l_ww $(BIN)/ww_ww
+	@ls -l $(BIN)/wwdump_ww $(BIN)/w6a_ww $(BIN)/w6l_ww $(BIN)/ww_ww
 	@rm -rf $(BS) && mkdir -p $(BS)
 	@echo
 	@echo "=== stage 2: ww2 = ww1 self-compiles main.combined.ww ==="
 	@$(BIN)/wwdump_ww -c selfhost/cmd/wwdump/main.combined.ww > $(BS)/ww2.s
-	@$(BIN)/6a_ww -o $(BS)/ww2.o $(BS)/ww2.s
+	@$(BIN)/w6a_ww -o $(BS)/ww2.o $(BS)/ww2.s
-	@$(BIN)/6l_ww -o $(BS)/ww2 $(BS)/ww2.o $(LIB)/libwwrt.a
+	@$(BIN)/w6l_ww -o $(BS)/ww2 $(BS)/ww2.o $(LIB)/libwwrt.a
 	@ls -l $(BS)/ww2
 	@echo
 	@echo "=== stage 3: ww3 = ww2 self-compiles main.combined.ww ==="
 	@$(BS)/ww2 -c selfhost/cmd/wwdump/main.combined.ww > $(BS)/ww3.s
-	@$(BIN)/6a_ww -o $(BS)/ww3.o $(BS)/ww3.s
+	@$(BIN)/w6a_ww -o $(BS)/ww3.o $(BS)/ww3.s
-	@$(BIN)/6l_ww -o $(BS)/ww3 $(BS)/ww3.o $(LIB)/libwwrt.a
+	@$(BIN)/w6l_ww -o $(BS)/ww3 $(BS)/ww3.o $(LIB)/libwwrt.a
 	@ls -l $(BS)/ww3
 	@echo
 	@echo "=== stage 4: ww4 = ww3 self-compiles main.combined.ww ==="
 	@$(BS)/ww3 -c selfhost/cmd/wwdump/main.combined.ww > $(BS)/ww4.s
-	@$(BIN)/6a_ww -o $(BS)/ww4.o $(BS)/ww4.s
+	@$(BIN)/w6a_ww -o $(BS)/ww4.o $(BS)/ww4.s
-	@$(BIN)/6l_ww -o $(BS)/ww4 $(BS)/ww4.o $(LIB)/libwwrt.a
+	@$(BIN)/w6l_ww -o $(BS)/ww4 $(BS)/ww4.o $(LIB)/libwwrt.a
 	@ls -l $(BS)/ww4
 	@echo
 	@echo "=== fixed-point gates ==="
@@ -316,21 +320,21 @@ bootstrap: all
 	@cmp $(BS)/ww3.o $(BS)/ww4.o && echo "  ww3.o == ww4.o ✓ (byte-identical .o)"
 	@cmp $(BS)/ww3 $(BS)/ww4 && echo "  ww3 == ww4 ✓ (byte-identical exe, ww3 is byte-stable as a compiler)"
 	@echo
-	@echo "BOOTSTRAP OK: ww-cgen + 6a_ww + 6l_ww reach a fixed point that holds across two iterations."
+	@echo "BOOTSTRAP OK: ww-cgen + w6a_ww + w6l_ww reach a fixed point that holds across two iterations."
 	@echo
 	@echo "Phase 10 remaining work:"
-	@echo "  - delete cmd/wwc/ cmd/6c/ cmd/6a/ cmd/6l/ cmd/ww/ in the final commit"
+	@echo "  - delete cmd/wcc/ cmd/w6c/ cmd/w6a/ cmd/w6l/ cmd/ww/ in the final commit"
 	@echo
 	@echo "Already in selfhost/:"
-	@echo "  - cmd/wwc/ : ww-cgen  (lex/parse/check/cgen) — bootstrap fixed point"
+	@echo "  - cmd/wcc/ : ww-cgen  (lex/parse/check/cgen) — bootstrap fixed point"
-	@echo "  - cmd/6c/  : ww-6c    (lex/parse/cgen front-end) — matches wwdump_ww -c (test 994)"
+	@echo "  - cmd/w6c/ : ww-w6c   (lex/parse/cgen front-end) — matches wwdump_ww -c (test 994)"
-	@echo "  - cmd/6a/  : ww-6a    (lex/parse/asm/obj) — byte-identical to C 6a (test 991)"
+	@echo "  - cmd/w6a/ : ww-w6a   (lex/parse/asm/obj) — byte-identical to C w6a (test 991)"
-	@echo "  - cmd/6l/  : ww-6l    (linker w/ archive support) — byte-identical to C 6l (test 992)"
+	@echo "  - cmd/w6l/ : ww-w6l   (linker w/ archive support) — byte-identical to C w6l (test 992)"
 	@echo "  - cmd/ww/  : ww-driver (build/run/version) — byte-identical to C ww (test 993)"
 
 # ---- nocc: bootstrap from a checked-in stage-0 binary, no cc -----------
 # A fresh-checkout flow that never invokes cc. Mirrors `make bootstrap`'s
-# fixed-point check but uses `bootstrap/$(ARCH)/{ww,6c,6a,6l}` as the
+# fixed-point check but uses `bootstrap/$(ARCH)/{ww,w6c,w6a,w6l}` as the
 # starting point and lands in $(OUT)/nocc/ so the cstage build under
 # $(OUT)/ stays untouched. See bootstrap/README.md and BOOTSTRAP.md.
 #
@@ -347,14 +351,14 @@ NOCC_OBJ	= $(NOCC_OUT)/obj
 bootstrap-snapshot: wwstage
 	@mkdir -p $(STAGE0)
 	@cp $(BIN)/ww_ww $(STAGE0)/ww
-	@cp $(BIN)/6c_ww $(STAGE0)/6c
+	@cp $(BIN)/w6c_ww $(STAGE0)/w6c
-	@cp $(BIN)/6a_ww $(STAGE0)/6a
+	@cp $(BIN)/w6a_ww $(STAGE0)/w6a
-	@cp $(BIN)/6l_ww $(STAGE0)/6l
+	@cp $(BIN)/w6l_ww $(STAGE0)/w6l
-	@echo "snapshot: $(STAGE0)/{ww,6c,6a,6l} populated from $(BIN)/*_ww"
+	@echo "snapshot: $(STAGE0)/{ww,w6c,w6a,w6l} populated from $(BIN)/*_ww"
 	@echo "         (gitignored — 'git add -f bootstrap/$(ARCH)/*' to ship)"
 
 nocc:
-	@for f in ww 6c 6a 6l; do \
+	@for f in ww w6c w6a w6l; do \
 		test -x $(STAGE0)/$$f || { \
 			echo "$@: missing $(STAGE0)/$$f"; \
 			echo "$@: run 'make bootstrap-snapshot' first, or read bootstrap/README.md"; \
@@ -366,38 +370,38 @@ nocc:
 	@mkdir -p $(NOCC_BIN) $(NOCC_LIB) $(NOCC_OBJ)
 	@# Stage 0: drop bootstrap binaries under both natural names and
 	@# the _ww-suffixed names the driver expects when shelling out.
-	@for f in ww 6c 6a 6l; do \
+	@for f in ww w6c w6a w6l; do \
 		cp $(STAGE0)/$$f $(NOCC_BIN)/$$f; \
 		cp $(STAGE0)/$$f $(NOCC_BIN)/$${f}_ww; \
 	done
-	@# Assemble libwwrt.a using stage-0 6a — the linker needs it for
+	@# Assemble libwwrt.a using stage-0 w6a — the linker needs it for
 	@# every wwstage-built binary in the next stage. Member order
 	@# follows $(RT_S) so the embedded symbol table matches the
 	@# cstage-built libwwrt.a (cstage uses ar rcs $(RT_OBJ), same
 	@# order).
 	@objs=""; for s in $(RT_S); do \
 		b=`basename $$s .s`; \
-		$(NOCC_BIN)/6a -o $(NOCC_OBJ)/$$b.o $$s; \
+		$(NOCC_BIN)/w6a -o $(NOCC_OBJ)/$$b.o $$s; \
 		objs="$$objs $(NOCC_OBJ)/$$b.o"; \
 	done; $(AR) rcs $(NOCC_LIB)/libwwrt.a $$objs
 	@echo "=== stage 1: stage-0 rebuilds the wwstage tools from source ==="
 	@# The driver's default lib path is $self_dir/../../lib — under
 	@# $(NOCC_BIN) that resolves to $(NOCC_OUT)/lib (libwwrt only).
 	@# Pass -I $(CURDIR)/lib so `use os` etc. resolve to source.
-	@cd $(NOCC_BIN) && ./ww build -I $(CURDIR)/selfhost/cmd/wwc \
+	@cd $(NOCC_BIN) && ./ww build -I $(CURDIR)/selfhost/cmd/wcc \
-		-I $(CURDIR)/lib $(CURDIR)/selfhost/cmd/6c/main.ww && mv main 6c_ww1
+		-I $(CURDIR)/lib $(CURDIR)/selfhost/cmd/w6c/main.ww && mv main w6c_ww1
-	@cd $(NOCC_BIN) && ./ww build -I $(CURDIR)/selfhost/cmd/6a \
+	@cd $(NOCC_BIN) && ./ww build -I $(CURDIR)/selfhost/cmd/w6a \
-		-I $(CURDIR)/selfhost/cmd/wwc -I $(CURDIR)/lib \
+		-I $(CURDIR)/selfhost/cmd/wcc -I $(CURDIR)/lib \
-		$(CURDIR)/selfhost/cmd/6a/main.ww && mv main 6a_ww1
+		$(CURDIR)/selfhost/cmd/w6a/main.ww && mv main w6a_ww1
-	@cd $(NOCC_BIN) && ./ww build -I $(CURDIR)/selfhost/cmd/6l \
+	@cd $(NOCC_BIN) && ./ww build -I $(CURDIR)/selfhost/cmd/w6l \
-		-I $(CURDIR)/selfhost/cmd/wwc -I $(CURDIR)/lib \
+		-I $(CURDIR)/selfhost/cmd/wcc -I $(CURDIR)/lib \
-		$(CURDIR)/selfhost/cmd/6l/main.ww && mv main 6l_ww1
+		$(CURDIR)/selfhost/cmd/w6l/main.ww && mv main w6l_ww1
-	@cd $(NOCC_BIN) && ./ww build -I $(CURDIR)/selfhost/cmd/wwc \
+	@cd $(NOCC_BIN) && ./ww build -I $(CURDIR)/selfhost/cmd/wcc \
 		-I $(CURDIR)/lib $(CURDIR)/selfhost/cmd/ww/main.ww && mv main ww_ww1
 	@echo "=== fixed-point gates: rebuilt tools == stage-0 binaries? ==="
-	@cmp $(NOCC_BIN)/6c_ww1 $(STAGE0)/6c && echo "  6c ✓"
+	@cmp $(NOCC_BIN)/w6c_ww1 $(STAGE0)/w6c && echo "  w6c ✓"
-	@cmp $(NOCC_BIN)/6a_ww1 $(STAGE0)/6a && echo "  6a ✓"
+	@cmp $(NOCC_BIN)/w6a_ww1 $(STAGE0)/w6a && echo "  w6a ✓"
-	@cmp $(NOCC_BIN)/6l_ww1 $(STAGE0)/6l && echo "  6l ✓"
+	@cmp $(NOCC_BIN)/w6l_ww1 $(STAGE0)/w6l && echo "  w6l ✓"
 	@cmp $(NOCC_BIN)/ww_ww1 $(STAGE0)/ww && echo "  ww ✓"
 	@echo
 	@echo "NOCC OK: $(STAGE0)/* reproduces itself from source. cc not invoked."

PLAN.md

@@ -13,31 +13,31 @@ that prints its version. No compilation yet.
 Deliverables:
 
 - `Makefile` (POSIX) with `all`, `test`, `clean`, `install` targets.
-- `cmd/wwc/` C library skeleton (builds `libwwc.a`):
+- `cmd/wcc/` C library skeleton (builds `libwcc.a`):
   - `ww.h`     — central typedefs (`Node`, `Sym`, `Type`, `Lex`)
   - `mem.c`    — bump arena allocator (no `malloc` in hot paths)
   - `err.c`    — `errorf`, `fatal`, `warn`
   - (lex/parse/check stubs added in later phases)
 - `cmd/ww/` driver skeleton: argv parsing, version print.
 - `test/run` — shell test harness.
-- `test/wwc/000_smoke.c` — smoke test that asserts `ww -V` prints
+- `test/wcc/000_smoke.c` — smoke test that asserts `ww -V` prints
   the version.
 
-Per-target binaries (`6c`, `6a`, `6l`) are NOT created here. They
+Per-target binaries (`w6c`, `w6a`, `w6l`) are NOT created here. They
 ship in their own phases (4, 5, 6).
 
 Exit criteria:
 
-- `make` produces `out/bin/ww` and `out/lib/libwwc.a`.
+- `make` produces `out/bin/ww` and `out/lib/libwcc.a`.
 - `make test` runs the smoke test and passes.
 
-## Phase 1 — Lexer (in `libwwc.a`)
+## Phase 1 — Lexer (in `libwcc.a`)
 
 Goal: tokenize ww source into a stream of `Tok` structs.
 
 Deliverables:
 
-- `cmd/wwc/lex.c` — hand-rolled DFA. Handles:
+- `cmd/wcc/lex.c` — hand-rolled DFA. Handles:
   - identifiers, keywords (`fn`, `let`, `def`, `if`, `else`, `for`,
     `switch`, `case`, `return`, `use`, `type`, `struct`, `defer`,
     `break`, `continue`, `export`, `proc`, `chan`, `nil`, `true`,
@@ -49,10 +49,10 @@ Deliverables:
     (`@symbol("name")`, etc.)
   - explicit `;` terminators — no automatic insertion (Hare rule)
   - `//` and `/* */` comments
-- `cmd/wwc/tok.c` — token names, debug printer.
+- `cmd/wcc/tok.c` — token names, debug printer.
-- `test/wwc/100_lex.c` — table-driven: input → token sequence.
+- `test/wcc/100_lex.c` — table-driven: input → token sequence.
 - `test/lang/lex/*.ww` — small files exercised via a tiny test
-  harness that links against `libwwc.a`.
+  harness that links against `libwcc.a`.
 
 Exit criteria:
 
@@ -60,15 +60,15 @@ Exit criteria:
   stream deterministically.
 - All lex tests green.
 
-## Phase 2 — Parser & AST (in `libwwc.a`)
+## Phase 2 — Parser & AST (in `libwcc.a`)
 
 Goal: parse the full grammar into an AST. No types yet.
 
 Deliverables:
 
-- `cmd/wwc/parse.c` — recursive descent. Pratt expression parser for
+- `cmd/wcc/parse.c` — recursive descent. Pratt expression parser for
   precedence. No yacc.
-- `cmd/wwc/ast.c` — `Node` constructor helpers; printer.
+- `cmd/wcc/ast.c` — `Node` constructor helpers; printer.
 - Grammar coverage:
   - `use` imports (paths use `.` not `::`)
   - `type` declarations (struct, alias, fn type) with trailing `=`
@@ -81,7 +81,7 @@ Deliverables:
   - `defer`
   - body-less `fn` declarations and `@symbol("name")` attribute for
     FFI imports
-- `test/wwc/200_parse.c` — table-driven AST shape tests.
+- `test/wcc/200_parse.c` — table-driven AST shape tests.
 - `test/lang/parse/*.ww` — programs that should parse but not yet
   typecheck; harness only checks parser exits 0.
 
@@ -91,22 +91,22 @@ Exit criteria:
   `ref/hare/cmd/hare/main.ha`.
 - AST printer output is deterministic.
 
-## Phase 3 — Type checker (in `libwwc.a`)
+## Phase 3 — Type checker (in `libwcc.a`)
 
 Goal: resolve names, infer/check types, produce a typed AST.
 
 Deliverables:
 
-- `cmd/wwc/sym.c` — symbol table. Lexical scopes. Plan 9 style hash.
+- `cmd/wcc/sym.c` — symbol table. Lexical scopes. Plan 9 style hash.
-- `cmd/wwc/type.c` — type representation, equality, conversion rules.
+- `cmd/wcc/type.c` — type representation, equality, conversion rules.
-- `cmd/wwc/check.c` — type checking pass over the AST. Errors carry
+- `cmd/wcc/check.c` — type checking pass over the AST. Errors carry
   source locations.
 - Built-in types: all integer widths, `bool`, `f32`, `f64`, `rune`,
   `str`, `void`, pointers, slices `[]T`, fixed arrays `[N]T`,
   function types.
 - Slice semantics: `{ ptr, len, cap }`, indexing bounds-checked at
   runtime (debug builds; release may elide via flag).
-- `test/wwc/300_check.c` — table-driven: src → expected error or OK.
+- `test/wcc/300_check.c` — table-driven: src → expected error or OK.
 - `test/lang/check/*.ww` — both passing and failing cases.
 
 Exit criteria:
@@ -114,17 +114,17 @@ Exit criteria:
 - All built-in types correctly checked.
 - Negative tests produce stable, useful diagnostics.
 
-## Phase 4 — `6c` amd64 compiler
+## Phase 4 — `w6c` amd64 compiler
 
 Goal: turn typed AST into Plan 9-style amd64 assembly text. The
-binary `6c` is a Plan 9 cc analogue for amd64. There is no separate
+binary `w6c` is a Plan 9 cc analogue for amd64. There is no separate
 SSA IR file; the only on-disk intermediate is `.s`.
 
 Deliverables:
 
-- `cmd/6c/` (links against `libwwc.a`):
+- `cmd/w6c/` (links against `libwcc.a`):
   - `6.out.h`  — amd64 opcode enum, register names, addressing
-    modes. Mirror `ref/plan9front/sys/src/cmd/6c/` shape.
+    modes. Mirror `ref/plan9front/sys/src/cmd/w6c/` shape.
   - `gc.h`     — `Prog`, `Adr`, scratch regs, stack layout.
   - `cgen.c`   — typed AST → `Prog` list (walking, not SSA).
   - `txt.c`    — `Prog` list → textual Plan 9 amd64 asm.
@@ -133,22 +133,22 @@ Deliverables:
     first; tighten later).
   - `mkfile`   — Plan 9 mkfile next to the Makefile entries.
 - Output suffix `.s`. Plan 9 amd64 asm syntax (not GAS).
-- `test/lang/6c/*.ww` — golden tests: src → expected `.s` text.
+- `test/lang/w6c/*.ww` — golden tests: src → expected `.s` text.
 
 Exit criteria:
 
-- `6c hello.ww` produces `hello.s`.
+- `w6c hello.ww` produces `hello.s`.
 - 20+ programs round-trip identically across runs.
-- The output is consumable by phase 5's `6a`.
+- The output is consumable by phase 5's `w6a`.
 
-## Phase 5 — `6a` amd64 assembler
+## Phase 5 — `w6a` amd64 assembler
 
 Goal: assemble Plan 9 amd64 asm into ELF object files. ELF (not
 Plan 9 a.out) so we can interop with C archives in phase 8.
 
 Deliverables:
 
-- `cmd/6a/`:
+- `cmd/w6a/`:
   - `lex.c`    — tokenize Plan 9 asm.
   - `parse.c`  — hand-rolled grammar (Plan 9 uses yacc; we go
     hand-rolled to keep rule #6 honest).
@@ -157,21 +157,21 @@ Deliverables:
   - `mkfile`
 - Pseudoregisters supported: `SP`, `FP`, `SB` (static base) per
   Plan 9 convention, on top of `AX`, `BX`, ..., `R8`-`R15`.
-- `test/wwc/500_asm.c` — round-trip known asm to known bytes.
+- `test/wcc/500_asm.c` — round-trip known asm to known bytes.
 
 Exit criteria:
 
-- `6a hello.s -o hello.o` produces a valid ELF amd64 object.
+- `w6a hello.s -o hello.o` produces a valid ELF amd64 object.
 - `objdump -d hello.o` matches expectations across a 20-program
   corpus.
 
-## Phase 6 — `6l` amd64 linker
+## Phase 6 — `w6l` amd64 linker
 
 Goal: link ELF objects into a static ELF executable.
 
 Deliverables:
 
-- `cmd/6l/`:
+- `cmd/w6l/`:
   - `obj.c`    — load ELF `.o` files and `.a` archives.
   - `sym.c`    — global symbol table; resolution.
   - `pass.c`   — section layout, relocation application.
@@ -182,14 +182,14 @@ Deliverables:
 
 Exit criteria:
 
-- `6l -o hello hello.o libwwrt.a` produces a static ELF binary.
+- `w6l -o hello hello.o libwwrt.a` produces a static ELF binary.
 - `ldd hello` reports "not a dynamic executable".
 - The binary exits 0 with the program's intended semantics.
 
 ## Phase 7 — Runtime + driver wiring
 
 Goal: a tiny static runtime, plus the `ww` driver wired to call
-`6c → 6a → 6l` end to end.
+`w6c → w6a → w6l` end to end.
 
 Deliverables:
 
@@ -201,8 +201,8 @@ Deliverables:
 - `rt/slice.c`     — slice helpers used by codegen
   (`bounds_check`, `slice_grow` for explicit user calls).
 - Build artifact: `out/lib/libwwrt.a`.
-- `cmd/ww/` driver: reads `ww build foo.ww`, runs `6c` then `6a`
+- `cmd/ww/` driver: reads `ww build foo.ww`, runs `w6c` then `w6a`
-  then `6l`, links `libwwrt.a` into the output.
+  then `w6l`, links `libwwrt.a` into the output.
 
 Exit criteria:
 
@@ -217,8 +217,8 @@ Deliverables:
 
 - Body-less `fn` declarations + `@symbol("name")` attribute parser
   and checker rules already in phases 2/3 — finalize codegen.
-- amd64 SysV ABI: formalize struct-by-value and varargs in `6c`.
+- amd64 SysV ABI: formalize struct-by-value and varargs in `w6c`.
-- `6l` learns to slurp static archives from a search path.
+- `w6l` learns to slurp static archives from a search path.
 - `lib/c/libc/` — minimal libc bindings (`malloc`, `free`, `printf`,
   `read`, `write`, `open`, `close`).
 - `lib/c/tls/`  — bindings to libtls or BearSSL (decide; BearSSL is
@@ -226,7 +226,7 @@ Deliverables:
 - `lib/c/crypto/` — bindings to libcrypto subset (sha256, aes, hmac).
 - `lib/c/curses/` — ncurses bindings (initscr, getch, mvprintw, ...).
 - `ww` driver: `ww build -lcrypto -ltls -lncurses` resolves these
-  via a `pkg-config`-style probe, hands `.a` paths to `6l`.
+  via a `pkg-config`-style probe, hands `.a` paths to `w6l`.
 
 Exit criteria:
 
@@ -268,7 +268,7 @@ Exit criteria per module:
 
 ## Phase 10 — Self-host
 
-Goal: rewrite `libwwc`, `6c`, `6a`, `6l`, and `ww` in ww. Drop the
+Goal: rewrite `libwcc`, `w6c`, `w6a`, `w6l`, and `ww` in ww. Drop the
 C bootstrap.
 
 Steps:
@@ -278,9 +278,9 @@ Steps:
 2. Port `lex.c` → `lex.ww`. Diff token streams against C output.
 3. Port `parse.c` → `parse.ww`. Diff ASTs.
 4. Port `check.c`. Diff typed ASTs.
-5. Port `6c` (cgen, txt, peep, reg, swt). Diff `.s` output byte
+5. Port `w6c` (cgen, txt, peep, reg, swt). Diff `.s` output byte
    for byte.
-6. Port `6a` and `6l`. Diff resulting `.o` and final binaries.
+6. Port `w6a` and `w6l`. Diff resulting `.o` and final binaries.
 7. Three-stage bootstrap:
    `Cstage (gcc-built tools) → ww1 → ww2 → ww3`, with
    `cmp ww2 ww3` OK for each tool.
@@ -288,7 +288,7 @@ Steps:
 Exit criteria:
 
 - `make bootstrap` runs the three-stage build green.
-- The C `cmd/wwc/`, `cmd/6c/`, `cmd/6a/`, `cmd/6l/` C trees are
+- The C `cmd/wcc/`, `cmd/w6c/`, `cmd/w6a/`, `cmd/w6l/` C trees are
   deleted in this phase's final commit.
 
 ### Status (2026-05)
@@ -296,10 +296,10 @@ Exit criteria:
 Steps 1–6 done. The five ww-side tools live in `selfhost/cmd/`:
 
 - `wwc/` — ww-native lex/parse/check/cgen (the frontend library)
-- `6c/`  — ww-native compiler binary; thin driver over wwc's cgen
+- `w6c/`  — ww-native compiler binary; thin driver over wwc's cgen
-- `6a/`  — ww-native amd64 assembler
+- `w6a/`  — ww-native amd64 assembler
-- `6l/`  — ww-native amd64 linker
+- `w6l/`  — ww-native amd64 linker
-- `ww/`  — ww-native driver, shells to `6c_ww/6a_ww/6l_ww`
+- `ww/`  — ww-native driver, shells to `w6c_ww/w6a_ww/w6l_ww`
 
 Step 7 reaches its fixed point: `make bootstrap` produces ww1 → ww2 →
 ww3 with `cmp ww2 ww3` byte-identical. Tests 990–994 confirm each
@@ -312,20 +312,20 @@ toolchain underneath).
 the wwstage tools end-to-end. Cstage is still required at first-
 checkout time (no checked-in stage-0 binary yet). ET_DYN dynamic
 linking is also fully ported to the ww side (test 996 confirms
-`6l_ww -L ... -l ...` is byte-identical to `6l` on snake); the one
+`w6l_ww -L ... -l ...` is byte-identical to `w6l` on snake); the one
 remaining gap is that `ww_ww build`'s argv parser does not yet
-forward `-L`/`-l` to the linker — `6l_ww` accepts them when invoked
+forward `-L`/`-l` to the linker — `w6l_ww` accepts them when invoked
 directly, just not through the ww-side driver. Snake's Makefile
-still drives the C `ww` for that reason; switching it to `6l_ww` +
+still drives the C `ww` for that reason; switching it to `w6l_ww` +
 explicit args works today.
 
 Exit criterion 1 (bootstrap green) is met. Exit criterion 2 (delete
-the C trees) is **deferred to v1.0**: removing `cmd/wwc/`, `cmd/6c/`,
+the C trees) is **deferred to v1.0**: removing `cmd/wcc/`, `cmd/w6c/`,
-`cmd/6a/`, `cmd/6l/`, `cmd/ww/` is a one-way door. Until the compiler
+`cmd/w6a/`, `cmd/w6l/`, `cmd/ww/` is a one-way door. Until the compiler
 stops churning we keep Cstage as the canonical fresh-checkout entry
 point and treat `selfhost/cmd/*` as the path forward. At v1.0, the
 plan is to ship a checked-in stage-0 binary archive
-(`bootstrap/<arch>/{ww,6c,6a,6l}`), delete the C trees, and promote
+(`bootstrap/<arch>/{ww,w6c,w6a,w6l}`), delete the C trees, and promote
 `selfhost/cmd/*` to `cmd/*`.
 
 See `BOOTSTRAP.md` for the build flow and `make cstage`/`make wwstage`
@@ -365,7 +365,7 @@ Exit criteria:
 
 ## Test cadence
 
-Every phase has its own test directory (`test/wwc/<phase>_*.c`,
+Every phase has its own test directory (`test/wcc/<phase>_*.c`,
 `test/lang/<phase-area>/*.ww`). `make test` runs them all in order
 of phase. CI is just `make test` in a clean tree.
 
@@ -387,7 +387,7 @@ Tag the tree at each phase boundary:
   you've copied.
 - **Writing a linker is hard.** ELF is documented, static linking
   is the small subset. Read `ref/plan9front/sys/src/cmd/8l/` and
-  the ELF spec before writing `6l`. Start with hello-world and grow.
+  the ELF spec before writing `w6l`. Start with hello-world and grow.
 - **Static linking against C libs.** OpenSSL is a pain to build
   static; BearSSL or LibreTLS are more pleasant. Pick early.
 - **Self-host bootstrap divergence.** Diff outputs at every stage,

bootstrap/README.md

@@ -6,15 +6,15 @@ executables that match the wwstage layout:
 
     bootstrap/amd64/
         ww      driver, equivalent to out/bin/ww_ww
-        6c      compiler,    out/bin/6c_ww
+        w6c      compiler,    out/bin/w6c_ww
-        6a      assembler,   out/bin/6a_ww
+        w6a      assembler,   out/bin/w6a_ww
-        6l      linker,      out/bin/6l_ww
+        w6l      linker,      out/bin/w6l_ww
 
 The binaries are intentionally **gitignored** until the compiler stops
 churning enough to make the trust surface stable — see `PLAN.md` and
 the v1.0 plan in `BOOTSTRAP.md`. To put them under your local working
 copy, run `make bootstrap-snapshot` after a green `make wwstage`; to
-ship them, `git add -f bootstrap/amd64/{ww,6c,6a,6l}` explicitly.
+ship them, `git add -f bootstrap/amd64/{ww,w6c,w6a,w6l}` explicitly.
 
 ## Workflow
 
@@ -30,6 +30,6 @@ build under `out/` is undisturbed.
 ## When to refresh the snapshot
 
 The stage-0 binaries are frozen at the cgen state they were built
-with. A `make nocc` failure usually means the live `selfhost/cmd/wwc`
+with. A `make nocc` failure usually means the live `selfhost/cmd/wcc`
 cgen has drifted from the snapshot — regenerate with
 `make bootstrap-snapshot` and re-verify.

cmd/w6a/a.h

@@ -1,8 +1,8 @@
 /*
- * a.h — 6a-private header. Modelled on Plan 9 cmd/6a/a.h, trimmed
+ * a.h — w6a-private header. Modelled on Plan 9 cmd/6a/a.h, trimmed
- * to the instruction subset that 6c emits.
+ * to the instruction subset that w6c emits.
  *
- * 6a is line-oriented and has no preprocessor: each non-blank, non-
+ * w6a is line-oriented and has no preprocessor: each non-blank, non-
  * label line is one instruction. We read the whole file into a list
  * of `Aprog`s, then encode and emit ELF64.
  */

cmd/w6a/asm.c

@@ -387,7 +387,7 @@ a_encode(Asm *a)
 				Asym *s = a_intern(a, p->to.sym);
 				a_addreloc(a, reloff, 2, s, -4);
 			} else {
-				fprintf(stderr, "6a: line %d: unsupported MOVQ shape\n", p->line);
+				fprintf(stderr, "w6a: line %d: unsupported MOVQ shape\n", p->line);
 				a->errs++;
 			}
 			break;
@@ -407,7 +407,7 @@ a_encode(Asm *a)
 				emit_modrm_mem(a, rcode(p->to.type),
 				    p->from.reg, p->from.offset);
 			} else {
-				fprintf(stderr, "6a: line %d: unsupported MOVB shape\n", p->line);
+				fprintf(stderr, "w6a: line %d: unsupported MOVB shape\n", p->line);
 				a->errs++;
 			}
 			break;
@@ -421,7 +421,7 @@ a_encode(Asm *a)
 				emit_modrm_mem(a, rcode(p->to.type),
 				    p->from.reg, p->from.offset);
 			} else {
-				fprintf(stderr, "6a: line %d: unsupported MOVZBQ shape\n", p->line);
+				fprintf(stderr, "w6a: line %d: unsupported MOVZBQ shape\n", p->line);
 				a->errs++;
 			}
 			break;
@@ -449,7 +449,7 @@ a_encode(Asm *a)
 				a_emit_byte(a, modrm(3,
 				    rcode(p->from.type), rcode(p->to.type)));
 			} else {
-				fprintf(stderr, "6a: line %d: unsupported MOVL shape\n", p->line);
+				fprintf(stderr, "w6a: line %d: unsupported MOVL shape\n", p->line);
 				a->errs++;
 			}
 			break;
@@ -462,7 +462,7 @@ a_encode(Asm *a)
 				emit_modrm_mem(a, rcode(p->to.type),
 				    p->from.reg, p->from.offset);
 			} else {
-				fprintf(stderr, "6a: line %d: unsupported MOVSXD shape\n", p->line);
+				fprintf(stderr, "w6a: line %d: unsupported MOVSXD shape\n", p->line);
 				a->errs++;
 			}
 			break;
@@ -479,7 +479,7 @@ a_encode(Asm *a)
 				sse_mr_load(a, 0xF2, 0x11, p->from.type,
 				    p->to.reg, p->to.offset);
 			} else {
-				fprintf(stderr, "6a: line %d: unsupported MOVSD shape\n", p->line);
+				fprintf(stderr, "w6a: line %d: unsupported MOVSD shape\n", p->line);
 				a->errs++;
 			}
 			break;
@@ -516,7 +516,7 @@ a_encode(Asm *a)
 				sse_mr_load(a, 0xF3, 0x11, p->from.type,
 				    p->to.reg, p->to.offset);
 			} else {
-				fprintf(stderr, "6a: line %d: unsupported MOVSS shape\n", p->line);
+				fprintf(stderr, "w6a: line %d: unsupported MOVSS shape\n", p->line);
 				a->errs++;
 			}
 			break;
@@ -665,7 +665,7 @@ a_encode(Asm *a)
 			break;
 		}
 		default:
-			fprintf(stderr, "6a: unsupported opcode %d on line %d\n", p->as, p->line);
+			fprintf(stderr, "w6a: unsupported opcode %d on line %d\n", p->as, p->line);
 			a->errs++;
 		}
 	}
@@ -673,7 +673,7 @@ a_encode(Asm *a)
 	/* second pass: patch fixups */
 	for (Fixup *f = fixups; f; f = f->next) {
 		if (!label_defined(a, f->label)) {
-			fprintf(stderr, "6a: undefined label '%s'\n", f->label);
+			fprintf(stderr, "w6a: undefined label '%s'\n", f->label);
 			a->errs++;
 			continue;
 		}

cmd/w6a/lex.c

@@ -1,5 +1,5 @@
 /*
- * lex.c — character-level helpers for 6a's line-oriented parser.
+ * lex.c — character-level helpers for w6a's line-oriented parser.
  * The parser itself lives in parse.c; here we keep the tokenisers
  * for identifiers and numbers so parse.c stays focused on syntax.
  */

cmd/w6a/main.c

@@ -1,5 +1,5 @@
 /*
- * 6a — amd64 assembler driver. Read .s, parse, encode, emit ELF .o.
+ * w6a — amd64 assembler driver. Read .s, parse, encode, emit ELF .o.
  */
 #include "a.h"
 #include <stdio.h>
@@ -32,18 +32,18 @@ main(int argc, char **argv)
 	for (int i = 1; i < argc; i++) {
 		if (strcmp(argv[i], "-o") == 0 && i + 1 < argc) out = argv[++i];
 		else if (argv[i][0] == '-') {
-			fprintf(stderr, "6a: unknown flag %s\n", argv[i]); return 2;
+			fprintf(stderr, "w6a: unknown flag %s\n", argv[i]); return 2;
 		} else if (src == NULL) src = argv[i];
-		else { fprintf(stderr, "6a: only one input\n"); return 2; }
+		else { fprintf(stderr, "w6a: only one input\n"); return 2; }
 	}
 	if (src == NULL || out == NULL) {
-		fputs("usage: 6a -o file.o file.s\n", stderr);
+		fputs("usage: w6a -o file.o file.s\n", stderr);
 		return 2;
 	}
 	char *buf;
 	u64 len;
 	if (slurp(src, &buf, &len) < 0) {
-		fprintf(stderr, "6a: cannot read %s\n", src);
+		fprintf(stderr, "w6a: cannot read %s\n", src);
 		return 1;
 	}
 	Asm a;
@@ -51,7 +51,7 @@ main(int argc, char **argv)
 	if (a_parse(&a) != 0) return 1;
 	if (a_encode(&a) != 0) return 1;
 	FILE *f = fopen(out, "wb");
-	if (f == NULL) { fprintf(stderr, "6a: cannot open %s\n", out); return 1; }
+	if (f == NULL) { fprintf(stderr, "w6a: cannot open %s\n", out); return 1; }
 	int rc = a_emit_elf(&a, f);
 	fclose(f);
 	free(buf);

cmd/w6a/parse.c

@@ -1,5 +1,5 @@
 /*
- * parse.c — line-oriented parser for the asm subset emitted by 6c.
+ * parse.c — line-oriented parser for the asm subset emitted by w6c.
  *
  * Grammar:
  *   line := blank | comment | label | text | instr
@@ -36,7 +36,7 @@ a_init(Asm *a, const char *file, const char *src, u64 len)
 static void
 err(Asm *a, const char *msg)
 {
-	fprintf(stderr, "6a: %s:%d: %s\n", a->file, a->line, msg);
+	fprintf(stderr, "w6a: %s:%d: %s\n", a->file, a->line, msg);
 	a->errs++;
 }
 

cmd/w6c/6.out.h

@@ -1,8 +1,8 @@
 /*
  * 6.out.h — amd64 instruction enum + register names. Mirrors the
  * Plan 9 6c shape (cmd/6c/6.out.h) but trimmed to the subset that
- * 6c emits and 6a consumes in this bootstrap. Each new opcode added
+ * w6c emits and w6a consumes in this bootstrap. Each new opcode added
- * here must also gain encoding support in cmd/6a/asm.c.
+ * here must also gain encoding support in cmd/w6a/asm.c.
  */
 #ifndef SIX_OUT_H
 #define SIX_OUT_H

cmd/w6c/cgen.c

@@ -10,7 +10,7 @@
  *    (SysV amd64 ABI). We don't yet handle struct-by-value or
  *    floats; floats and slices are deferred.
  *
- * Calling our own functions: emit CALL <name>(SB), let 6a/6l resolve.
+ * Calling our own functions: emit CALL <name>(SB), let w6a/w6l resolve.
  * Calling C externs: same — extern symbols are just unresolved CALLs.
  */
 #include "gc.h"
@@ -605,7 +605,7 @@ cgexpr(Cg *c, Node *n, Local *locals)
 		 * inspect n->lhs. UCOMISD/UCOMISS sets ZF/CF as if an
 		 * unsigned compare, so the JA family is the right Jcc set
 		 * regardless of how the operand types are signed. Plan 9's
-		 * own 6c picks the same pattern (txt.c around AUCOMISD).
+		 * own w6c picks the same pattern (txt.c around AUCOMISD).
 		 * NaN handling: UCOMI sets PF on unordered; we ignore it,
 		 * which means NaN compares behave like Hare's default. */
 		if (n->lhs && node_isfloat(n->lhs) &&
@@ -1837,7 +1837,7 @@ cgexpr(Cg *c, Node *n, Local *locals)
 		 * with a single MOVQ. Without this, returning `o.p.val`
 		 * silently leaves AX = o.p (the pointer) and the outer
 		 * cast/use sees the pointer instead of the dereferenced
-		 * field. (Surfaced building ww-6l.) */
+		 * field. (Surfaced building ww-w6l.) */
 		if (n->lhs->kind == N_DOT) {
 			Type *lt = n->lhs->type;
 			Type *lu = (lt && lt->kind == TY_NAMED) ? lt->under : lt;
@@ -1927,7 +1927,7 @@ cgexpr(Cg *c, Node *n, Local *locals)
 		 * size — `b.data[i]` on a *u8 must read 1 byte, not 8.
 		 *
 		 * Scale the index in a register before pushing, because
-		 * IMULQ on a memory operand isn't currently encoded by 6a
+		 * IMULQ on a memory operand isn't currently encoded by w6a
 		 * (modrm bits use mod=3 register form). */
 		cgexpr(c, n->rhs, locals);
 		if (esz > 1) {
@@ -2614,7 +2614,7 @@ cgfn(Cg *c, FILE *out, Node *fn)
 }
 
 /* Emit DATA directives for top-level `def` constants whose value is
- * an integer/rune literal. The 6a side stores the bytes inside .text
+ * an integer/rune literal. The w6a side stores the bytes inside .text
  * and accesses are RIP-relative.
  */
 static void

cmd/w6c/gc.h

@@ -1,5 +1,5 @@
 /*
- * gc.h — 6c-private header: Prog/Adr structs, scratch register set,
+ * gc.h — w6c-private header: Prog/Adr structs, scratch register set,
  * stack-frame state. Plan 9 cmd/6c/gc.h shape, trimmed.
  */
 #ifndef SIX_GC_H

cmd/w6c/main.c

@@ -1,6 +1,6 @@
 /*
- * 6c — amd64 compiler driver. Reads a .ww source file, runs the
+ * w6c — amd64 compiler driver. Reads a .ww source file, runs the
- * libwwc frontend (lex → parse → check), then walks the typed AST
+ * libwcc frontend (lex → parse → check), then walks the typed AST
  * via cgen.c and writes Plan 9-flavoured amd64 asm to stdout (or
  * the file given by -o).
  */
@@ -38,24 +38,24 @@ main(int argc, char **argv)
 		if (strcmp(a, "-o") == 0 && i + 1 < argc) {
 			out = argv[++i];
 		} else if (a[0] == '-') {
-			fprintf(stderr, "6c: unknown flag %s\n", a);
+			fprintf(stderr, "w6c: unknown flag %s\n", a);
 			return 2;
 		} else if (src == NULL) {
 			src = a;
 		} else {
-			fprintf(stderr, "6c: only one input supported\n");
+			fprintf(stderr, "w6c: only one input supported\n");
 			return 2;
 		}
 	}
 	if (src == NULL) {
-		fputs("usage: 6c [-o out.s] file.ww\n", stderr);
+		fputs("usage: w6c [-o out.s] file.ww\n", stderr);
 		return 2;
 	}
 
 	char *buf;
 	u64 len;
 	if (slurp(src, &buf, &len) < 0) {
-		fprintf(stderr, "6c: %s: cannot read\n", src);
+		fprintf(stderr, "w6c: %s: cannot read\n", src);
 		return 1;
 	}
 
@@ -78,7 +78,7 @@ main(int argc, char **argv)
 	if (out) {
 		of = fopen(out, "wb");
 		if (of == NULL) {
-			fprintf(stderr, "6c: cannot open %s\n", out);
+			fprintf(stderr, "w6c: cannot open %s\n", out);
 			return 1;
 		}
 	}

cmd/w6c/txt.c

@@ -1,7 +1,7 @@
 /*
  * txt.c — print a Prog list as Plan 9-flavoured amd64 asm text.
  *
- * Format we emit (and that 6a expects):
+ * Format we emit (and that w6a expects):
  *   TEXT name<framesize>
  *       MOVQ $1, AX
  *       MOVQ AX, name(SB)        ; extern symbol

cmd/w6l/dyn.c

@@ -86,11 +86,11 @@ l_load_so(Lnk *l, const char *path)
 	u8 *buf;
 	u64 len;
 	if (l_read_all(path, &buf, &len) < 0) {
-		fprintf(stderr, "6l: %s: cannot read\n", path);
+		fprintf(stderr, "w6l: %s: cannot read\n", path);
 		return -1;
 	}
 	if (len < sizeof(Ehdr)) {
-		fprintf(stderr, "6l: %s: short ELF\n", path);
+		fprintf(stderr, "w6l: %s: short ELF\n", path);
 		free(buf);
 		return -1;
 	}
@@ -99,12 +99,12 @@ l_load_so(Lnk *l, const char *path)
 	    || eh->e_ident[4] != 2
 	    || eh->e_machine != 62 /* EM_X86_64 */
 	    || eh->e_type != ET_DYN) {
-		fprintf(stderr, "6l: %s: not an amd64 ET_DYN\n", path);
+		fprintf(stderr, "w6l: %s: not an amd64 ET_DYN\n", path);
 		free(buf);
 		return -1;
 	}
 	if (eh->e_shoff == 0 || eh->e_shnum == 0) {
-		fprintf(stderr, "6l: %s: stripped .so unsupported\n", path);
+		fprintf(stderr, "w6l: %s: stripped .so unsupported\n", path);
 		free(buf);
 		return -1;
 	}
@@ -119,7 +119,7 @@ l_load_so(Lnk *l, const char *path)
 		if (sh[i].sh_type == SHT_GNU_VERDEF)  idx_verdef  = i;
 	}
 	if (idx_dynsym < 0) {
-		fprintf(stderr, "6l: %s: no .dynsym\n", path);
+		fprintf(stderr, "w6l: %s: no .dynsym\n", path);
 		free(buf);
 		return -1;
 	}

cmd/w6l/dynout.c

@@ -157,7 +157,7 @@ l_emit_dyn_elf(Lnk *l, FILE *f, u64 base, u64 entry)
 	}
 	for (int i = 0; i < N; i++) {
 		if (dynsyms[i] == NULL) {
-			fprintf(stderr, "6l: dynout: no sym for plt_idx %d\n", i);
+			fprintf(stderr, "w6l: dynout: no sym for plt_idx %d\n", i);
 			free(dynsyms);
 			return 1;
 		}
@@ -288,7 +288,7 @@ l_emit_dyn_elf(Lnk *l, FILE *f, u64 base, u64 entry)
 			}
 		}
 		if (!matched) {
-			fprintf(stderr, "6l: dynout: unmatched version %s for %s\n",
+			fprintf(stderr, "w6l: dynout: unmatched version %s for %s\n",
 			    vname, dynsyms[j]->name);
 			versym_for[j] = VER_NDX_GLOBAL;
 		}
@@ -529,7 +529,7 @@ l_emit_dyn_elf(Lnk *l, FILE *f, u64 base, u64 entry)
 		}
 		dynamic[k].d_tag = DT_NULL;     dynamic[k].d_val = 0;           k++;
 		if ((u64)k != ndyn) {
-			fprintf(stderr, "6l: dynamic entry count mismatch\n");
+			fprintf(stderr, "w6l: dynamic entry count mismatch\n");
 			return 1;
 		}
 	}
@@ -540,7 +540,7 @@ l_emit_dyn_elf(Lnk *l, FILE *f, u64 base, u64 entry)
 	for (Lrel *r = l->rels; r; r = r->next) {
 		if (r->sym == NULL || !r->sym->is_dyn) continue;
 		if (r->kind != R_X86_64_PC32 && r->kind != R_X86_64_PLT32) {
-			fprintf(stderr, "6l: dynamic reloc kind %d unsupported\n",
+			fprintf(stderr, "w6l: dynamic reloc kind %d unsupported\n",
 			    r->kind);
 			free(dynsyms); free(sos_used); free(soname_str);
 			free(symname_str); free(dynstr); free(dynsym);

cmd/w6l/l.h

@@ -1,6 +1,6 @@
 /*
- * l.h — 6l-private header. Loads relocatable ELF64 .o files (the
+ * l.h — w6l-private header. Loads relocatable ELF64 .o files (the
- * format produced by 6a) and links them into a static executable.
+ * format produced by w6a) and links them into a static executable.
  *
  * No archives yet (phase 8). No dynamic linking ever.
  */

cmd/w6l/main.c

@@ -1,10 +1,10 @@
 /*
- * 6l — amd64 linker. Reads relocatable ELF .o files (from 6a) plus
+ * w6l — amd64 linker. Reads relocatable ELF .o files (from w6a) plus
  * .a archives, resolves, relocates, writes a static ELF executable.
  * Dynamic linking against .so files is the next increment; the -L/-l
  * flag plumbing here is its first step.
  *
- *   6l -o out [-L<dir>...] [-l<name>...] file1.o file2.o ...
+ *   w6l -o out [-L<dir>...] [-l<name>...] file1.o file2.o ...
  *
  * The first symbol named "_start" defined among the inputs becomes
  * the entry point. If none is found, fall back to "main".
@@ -80,14 +80,14 @@ main(int argc, char **argv)
 		} else if (strcmp(argv[i], "-l") == 0 && i + 1 < argc) {
 			lflags[n_lflags++] = argv[++i];
 		} else if (argv[i][0] == '-') {
-			fprintf(stderr, "6l: unknown flag %s\n", argv[i]);
+			fprintf(stderr, "w6l: unknown flag %s\n", argv[i]);
 			return 2;
 		} else {
 			inputs[ninputs++] = argv[i];
 		}
 	}
 	if (out == NULL || ninputs == 0) {
-		fputs("usage: 6l -o exe [-L<dir>...] [-l<name>...] "
+		fputs("usage: w6l -o exe [-L<dir>...] [-l<name>...] "
 		    "file1.o [file2.o...]\n", stderr);
 		return 2;
 	}
@@ -98,7 +98,7 @@ main(int argc, char **argv)
 	for (int i = 0; i < n_lflags; i++) {
 		const char *p = resolve_lib(lflags[i], libdirs, n_libdirs);
 		if (p == NULL) {
-			fprintf(stderr, "6l: cannot find -l%s\n", lflags[i]);
+			fprintf(stderr, "w6l: cannot find -l%s\n", lflags[i]);
 			return 1;
 		}
 		inputs[ninputs++] = p;
@@ -120,13 +120,13 @@ main(int argc, char **argv)
 	Lsym *entry = l_lookup(&l, "_start");
 	if (entry == NULL || !entry->defined) entry = l_lookup(&l, "main");
 	if (entry == NULL || !entry->defined) {
-		fprintf(stderr, "6l: no _start or main symbol defined\n");
+		fprintf(stderr, "w6l: no _start or main symbol defined\n");
 		return 1;
 	}
 
 	FILE *f = fopen(out, "wb");
 	if (f == NULL) {
-		fprintf(stderr, "6l: cannot open %s\n", out);
+		fprintf(stderr, "w6l: cannot open %s\n", out);
 		return 1;
 	}
 	int rc = l_emit_elf(&l, f, base, base + 0x1000 + entry->val);

cmd/w6l/obj.c

@@ -1,5 +1,5 @@
 /*
- * obj.c — load an ELF64 relocatable object emitted by 6a, append its
+ * obj.c — load an ELF64 relocatable object emitted by w6a, append its
  * .text bytes to the combined image, and pull its symbols and
  * relocations into the global tables (with offsets adjusted to the
  * combined section).
@@ -251,7 +251,7 @@ load_image(Lnk *l, const char *path, u8 *buf, u64 len)
 	Ehdr *eh = (Ehdr *)buf;
 	if (memcmp(eh->e_ident, "\x7f""ELF", 4) != 0 || eh->e_ident[4] != 2
 	    || eh->e_machine != EM_X86_64 || eh->e_type != ET_REL) {
-		fprintf(stderr, "6l: %s: not an amd64 ELF64 relocatable\n", path);
+		fprintf(stderr, "w6l: %s: not an amd64 ELF64 relocatable\n", path);
 		free(buf);
 		return -1;
 	}
@@ -271,7 +271,7 @@ load_image(Lnk *l, const char *path, u8 *buf, u64 len)
 			idx_rela = i;
 	}
 	if (idx_text < 0 || idx_symtab < 0) {
-		fprintf(stderr, "6l: %s: missing .text or .symtab\n", path);
+		fprintf(stderr, "w6l: %s: missing .text or .symtab\n", path);
 		free(buf);
 		return -1;
 	}
@@ -303,7 +303,7 @@ load_image(Lnk *l, const char *path, u8 *buf, u64 len)
 		if (symtab[i].st_shndx != 0 /* SHN_UNDEF */
 		    && symtab[i].st_shndx == idx_text) {
 			if (gs->defined) {
-				fprintf(stderr, "6l: %s: duplicate symbol %s\n",
+				fprintf(stderr, "w6l: %s: duplicate symbol %s\n",
 				    path, nm);
 				l->errs++;
 			} else {

cmd/w6l/pass.c

@@ -50,7 +50,7 @@ l_resolve(Lnk *l)
 	for (Lrel *r = l->rels; r; r = r->next) {
 		if (r->sym == NULL) continue;
 		if (!r->sym->defined && !r->sym->is_dyn) {
-			fprintf(stderr, "6l: undefined reference to '%s'\n",
+			fprintf(stderr, "w6l: undefined reference to '%s'\n",
 			    r->sym->name);
 			l->errs++;
 		}
@@ -86,7 +86,7 @@ l_relocate(Lnk *l, u64 base)
 			break;
 		}
 		default:
-			fprintf(stderr, "6l: unsupported reloc kind %d\n",
+			fprintf(stderr, "w6l: unsupported reloc kind %d\n",
 			    r->kind);
 			l->errs++;
 		}

cmd/wcc/check.c

@@ -460,7 +460,7 @@ cexpr(Checker *c, Node *n)
 		if (ft == ty_err) {
 			/* Walk args anyway so cgen sees real types. The
 			 * common case is a module-qualified call whose leaf
-			 * isn't in this scope (raw 6c on a single file with
+			 * isn't in this scope (raw w6c on a single file with
 			 * `use mod;` but no driver concatenation). */
 			for (Node *a = n->list; a; a = a->next)
 				(void)cexpr(c, a);

cmd/wcc/ww.h

@@ -1,5 +1,5 @@
 /*
- * ww.h — central header for libwwc.a (the ww frontend library).
+ * ww.h — central header for libwcc.a (the ww frontend library).
  *
  * Plan 9 in spirit. This file mirrors cc/cc.h's role: one shared
  * header that declares everything every translation unit in the

cmd/ww/main.c

@@ -2,28 +2,36 @@
  * ww — the user-facing driver. Plan 9 cc(1) / Hare hare(1) analogue.
  *
  * Pipeline:
- *    ww build foo.ww   →  6c foo.ww > foo.s ; 6a foo.s > foo.o ;
+ *    ww build foo.ww   →  w6c foo.ww > foo.s ; w6a foo.s > foo.o ;
- *                          6l -o foo foo.o <runtime.o>
+ *                          w6l -o foo foo.o <runtime.o>
  *    ww run   foo.ww   →  build then exec ./foo
  *
  * Tool paths default to siblings of $0 (so a fresh build runs out of
- * out/bin/), and can be overridden with WW_6C / WW_6A / WW_6L.
+ * out/bin/), and can be overridden with WW_W6C / WW_W6A / WW_W6L.
  */
 #include "ww.h"
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <sys/wait.h>
+#include <sys/stat.h>
+#include <dirent.h>
 #include <libgen.h>
 
 static const char *usage =
 "usage: ww [-V] <subcommand> [args...]\n"
 "  -V                print version and exit\n"
-"  build  <path>   compile module to a static binary\n"
+"  build  [path]     compile module to a static binary (path defaults to cwd)\n"
-"  run    <path>   build then exec\n"
+"  run    [path] ... build then exec, passing extra args to the program\n"
-"  test   <path>   build and run module tests\n"
+"  test   [path]     build and run *_test.ww in the module (path defaults to cwd)\n"
 "  fmt    <path>     reformat ww source\n"
-"  version         print version and exit\n";
+"  version           print version and exit\n"
+"\n"
+"  path forms:\n"
+"    foo.ww          literal file\n"
+"    foo             search cwd, -I dirs, then $WW_LIB for foo.ww or foo/foo.ww\n"
+"    lib/foo         directory: build lib/foo/foo.ww\n"
+"    .               build the cwd's <basename>.ww\n";
 
 static char *self_dir;	/* directory containing this binary */
 
@@ -159,9 +167,9 @@ static int
 build_one(const char *src, const char *out, const char *extra_includes,
     const char *extra_libs, const char *extra_libdirs)
 {
-	const char *c6 = toolpath("WW_6C", "6c");
+	const char *c6 = toolpath("WW_W6C", "w6c");
-	const char *a6 = toolpath("WW_6A", "6a");
+	const char *a6 = toolpath("WW_W6A", "w6a");
-	const char *l6 = toolpath("WW_6L", "6l");
+	const char *l6 = toolpath("WW_W6L", "w6l");
 	const char *libdir = getenv("WW_LIB");
 	if (libdir == NULL || libdir[0] == 0) {
 		static char libbuf[1024];
@@ -216,12 +224,12 @@ build_one(const char *src, const char *out, const char *extra_includes,
 	char cmd[4096];
 	snprintf(cmd, sizeof cmd, "%s -o %s %s", c6, asmf, combined);
 	if (run(cmd) != 0) {
-		fprintf(stderr, "ww: 6c failed\n");
+		fprintf(stderr, "ww: w6c failed\n");
 		return 1;
 	}
 	snprintf(cmd, sizeof cmd, "%s -o %s %s", a6, obj, asmf);
 	if (run(cmd) != 0) {
-		fprintf(stderr, "ww: 6a failed\n");
+		fprintf(stderr, "ww: w6a failed\n");
 		return 1;
 	}
 	/* Link runtime: prefer libwwrt.a (selective archive pull) but
@@ -238,7 +246,7 @@ build_one(const char *src, const char *out, const char *extra_includes,
 		snprintf(a2, sizeof a2, "%s/../obj/rt/syscall.o", self_dir);
 		snprintf(rtargs, sizeof rtargs, "%s %s", a1, a2);
 	}
-	/* -L<dir> goes before -l<name> so 6l can resolve the latter. */
+	/* -L<dir> goes before -l<name> so w6l can resolve the latter. */
 	const char *libargs   = (extra_libs    && extra_libs[0])    ? extra_libs    : "";
 	const char *libdirset = (extra_libdirs && extra_libdirs[0]) ? extra_libdirs : "";
 	snprintf(cmd, sizeof cmd, "%s -o %s %s %s%s%s%s%s",
@@ -246,7 +254,7 @@ build_one(const char *src, const char *out, const char *extra_includes,
 	    libdirset[0] ? " " : "", libdirset,
 	    libargs[0]   ? " " : "", libargs);
 	if (run(cmd) != 0) {
-		fprintf(stderr, "ww: 6l failed\n");
+		fprintf(stderr, "ww: w6l failed\n");
 		return 1;
 	}
 	return 0;
@@ -259,71 +267,293 @@ do_version(void)
 	return 0;
 }
 
+/* Compose the standard module search path: cwd : <extra-includes> : $WW_LIB
+ * source dir. The `extra` string is colon-separated -I dirs from argv. */
+static const char *
+search_path(const char *extra, char *buf, size_t bufsz)
+{
+	const char *libdir = getenv("WW_SRCLIB");
+	static char libbuf[1024];
+	if (libdir == NULL || libdir[0] == 0) {
+		libdir = getenv("WW_LIB");
+	}
+	if (libdir == NULL || libdir[0] == 0) {
+		snprintf(libbuf, sizeof libbuf, "%s/../../lib", self_dir);
+		if (access(libbuf, 0) == 0) libdir = libbuf;
+		else if (access("lib", 0) == 0) libdir = "lib";
+		else {
+			snprintf(libbuf, sizeof libbuf, "%s/../lib", self_dir);
+			libdir = libbuf;
+		}
+	}
+	if (extra && extra[0])
+		snprintf(buf, bufsz, ".:%s:%s", extra, libdir);
+	else
+		snprintf(buf, bufsz, ".:%s", libdir);
+	return buf;
+}
+
+/* basename_no_ext: last path segment with any trailing ".ww" stripped. */
+static void
+basename_no_ext(const char *path, char *out, size_t outsz)
+{
+	const char *base = strrchr(path, '/');
+	base = base ? base + 1 : path;
+	snprintf(out, outsz, "%s", base);
+	char *dot = strrchr(out, '.');
+	if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';
+}
+
+/* resolve_module: turn a name into a concrete .ww file path.
+ *   foo.ww        → use as-is if it exists
+ *   <existing dir> → <dir>/<basename>.ww (Hare module convention)
+ *   .             → <cwd-basename>.ww in the cwd
+ *   foo (bare)    → walk cwd:incs:WW_LIB for foo.ww or foo/foo.ww
+ * Returns 1 on success and writes the path to `out`, 0 on failure. */
+static int
+resolve_module(const char *name, const char *incs, char *out, size_t outsz)
+{
+	struct stat st;
+	if (stat(name, &st) == 0) {
+		if (S_ISREG(st.st_mode)) {
+			snprintf(out, outsz, "%s", name);
+			return 1;
+		}
+		if (S_ISDIR(st.st_mode)) {
+			char buf[1024];
+			const char *base;
+			if (strcmp(name, ".") == 0) {
+				if (getcwd(buf, sizeof buf) == NULL) return 0;
+			} else {
+				snprintf(buf, sizeof buf, "%s", name);
+				size_t bl = strlen(buf);
+				while (bl > 1 && buf[bl-1] == '/') buf[--bl] = '\0';
+			}
+			const char *b = strrchr(buf, '/');
+			base = b ? b + 1 : buf;
+			snprintf(out, outsz, "%s/%s.ww", name, base);
+			if (access(out, 0) == 0) return 1;
+			return 0;
+		}
+	}
+	char sp[4096];
+	search_path(incs, sp, sizeof sp);
+	if (locate_import(sp, name, out, outsz)) return 1;
+	return 0;
+}
+
+/* Append `path` to a heap string-array. Caller frees each entry + the array. */
+static void
+strarr_push(char ***arr, int *n, int *cap, const char *path)
+{
+	if (*n + 1 > *cap) {
+		*cap = *cap ? *cap * 2 : 8;
+		*arr = realloc(*arr, *cap * sizeof **arr);
+	}
+	(*arr)[(*n)++] = strdup(path);
+}
+
+/* collect_tests: enumerate _test.ww files in <dir> (no recursion).
+ * Returns 0 on success and writes the file list + count, -1 on failure. */
+static int
+collect_tests(const char *dir, char ***files, int *n)
+{
+	DIR *d = opendir(dir);
+	if (!d) return -1;
+	*files = NULL;
+	*n = 0;
+	int cap = 0;
+	struct dirent *ent;
+	while ((ent = readdir(d)) != NULL) {
+		const char *nm = ent->d_name;
+		size_t nl = strlen(nm);
+		const char *suf = "_test.ww";
+		size_t sl = strlen(suf);
+		if (nl <= sl) continue;
+		if (strcmp(nm + nl - sl, suf) != 0) continue;
+		char path[1024];
+		snprintf(path, sizeof path, "%s/%s", dir, nm);
+		strarr_push(files, n, &cap, path);
+	}
+	closedir(d);
+	return 0;
+}
+
+/* Parse the standard -I/-L/-l flags into incs/libdirs/libs. The first
+ * non-flag positional becomes *src_out. Returns the index past the last
+ * arg consumed for positionals (so callers can pick up trailing args). */
+static int
+parse_build_flags(int argc, char **argv,
+    char *incs, size_t incsz,
+    char *libdirs, size_t libdirsz,
+    char *libs, size_t libsz,
+    const char **src_out)
+{
+	*src_out = NULL;
+	int i = 0;
+	for (; i < argc; i++) {
+		if (strncmp(argv[i], "-l", 2) == 0 && argv[i][2]) {
+			size_t n = strlen(libs);
+			snprintf(libs + n, libsz - n,
+			    "%s%s", n ? " " : "", argv[i]);
+		} else if (strcmp(argv[i], "-l") == 0 && i + 1 < argc) {
+			size_t n = strlen(libs);
+			snprintf(libs + n, libsz - n,
+			    "%s-l%s", n ? " " : "", argv[++i]);
+		} else if (strcmp(argv[i], "-L") == 0 && i + 1 < argc) {
+			size_t n = strlen(libdirs);
+			snprintf(libdirs + n, libdirsz - n,
+			    "%s-L%s", n ? " " : "", argv[++i]);
+		} else if (strncmp(argv[i], "-L", 2) == 0 && argv[i][2]) {
+			size_t n = strlen(libdirs);
+			snprintf(libdirs + n, libdirsz - n,
+			    "%s%s", n ? " " : "", argv[i]);
+		} else if (strcmp(argv[i], "-I") == 0 && i + 1 < argc) {
+			size_t n = strlen(incs);
+			snprintf(incs + n, incsz - n,
+			    "%s%s", n ? ":" : "", argv[++i]);
+		} else if (strncmp(argv[i], "-I", 2) == 0 && argv[i][2]) {
+			size_t n = strlen(incs);
+			snprintf(incs + n, incsz - n,
+			    "%s%s", n ? ":" : "", argv[i] + 2);
+		} else if (*src_out == NULL) {
+			*src_out = argv[i];
+		} else {
+			break;	/* leave remaining argv to caller (run-args) */
+		}
+	}
+	return i;
+}
+
 static int
 do_build(int argc, char **argv)
 {
 	const char *src = NULL;
-	char libs[2048]    = {0};	/* -l<name> entries, space-separated */
+	char libs[2048]    = {0};
-	char libdirs[2048] = {0};	/* -L<dir>  entries, space-separated */
+	char libdirs[2048] = {0};
 	char incs[2048]    = {0};
-	for (int i = 0; i < argc; i++) {
+	parse_build_flags(argc, argv, incs, sizeof incs,
-		if (strncmp(argv[i], "-l", 2) == 0 && argv[i][2]) {
+	    libdirs, sizeof libdirs, libs, sizeof libs, &src);
-			size_t n = strlen(libs);
+	if (src == NULL) src = ".";	/* default: build cwd */
-			snprintf(libs + n, sizeof libs - n,
+	char resolved[1024];
-			    "%s%s", n ? " " : "", argv[i]);
+	if (!resolve_module(src, incs, resolved, sizeof resolved)) {
-		} else if (strcmp(argv[i], "-l") == 0 && i + 1 < argc) {
+		fprintf(stderr, "ww build: cannot find module %s\n", src);
-			size_t n = strlen(libs);
+		return 1;
-			snprintf(libs + n, sizeof libs - n,
-			    "%s-l%s", n ? " " : "", argv[++i]);
-		} else if (strcmp(argv[i], "-L") == 0 && i + 1 < argc) {
-			size_t n = strlen(libdirs);
-			snprintf(libdirs + n, sizeof libdirs - n,
-			    "%s-L%s", n ? " " : "", argv[++i]);
-		} else if (strncmp(argv[i], "-L", 2) == 0 && argv[i][2]) {
-			size_t n = strlen(libdirs);
-			snprintf(libdirs + n, sizeof libdirs - n,
-			    "%s%s", n ? " " : "", argv[i]);
-		} else if (strcmp(argv[i], "-I") == 0 && i + 1 < argc) {
-			size_t n = strlen(incs);
-			snprintf(incs + n, sizeof incs - n,
-			    "%s%s", n ? ":" : "", argv[++i]);
-		} else if (strncmp(argv[i], "-I", 2) == 0 && argv[i][2]) {
-			size_t n = strlen(incs);
-			snprintf(incs + n, sizeof incs - n,
-			    "%s%s", n ? ":" : "", argv[i] + 2);
-		} else if (src == NULL) {
-			src = argv[i];
 	}
-	}
-	if (src == NULL) { fputs("ww build: missing source\n", stderr); return 2; }
 	char out[1024];
-	const char *base = strrchr(src, '/');
+	basename_no_ext(resolved, out, sizeof out);
-	base = base ? base + 1 : src;
+	return build_one(resolved, out, incs, libs, libdirs);
-	snprintf(out, sizeof out, "%s", base);
-	char *dot = strrchr(out, '.');
-	if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';
-	return build_one(src, out, incs, libs, libdirs);
 }
 
 static int
 do_run(int argc, char **argv)
 {
-	if (argc < 1) { fputs("ww run: missing source\n", stderr); return 2; }
+	const char *src = NULL;
+	char libs[2048]    = {0};
+	char libdirs[2048] = {0};
+	char incs[2048]    = {0};
+	int next = parse_build_flags(argc, argv, incs, sizeof incs,
+	    libdirs, sizeof libdirs, libs, sizeof libs, &src);
+	if (src == NULL) src = ".";
+	char resolved[1024];
+	if (!resolve_module(src, incs, resolved, sizeof resolved)) {
+		fprintf(stderr, "ww run: cannot find module %s\n", src);
+		return 1;
+	}
 	char tmp[1024];
 	snprintf(tmp, sizeof tmp, "/tmp/ww_run_%d", getpid());
-	if (build_one(argv[0], tmp, "", "", "") != 0) return 1;
+	if (build_one(resolved, tmp, incs, libs, libdirs) != 0) return 1;
-	int rc = run(tmp);
+	/* exec the built binary with any trailing argv as its argv. */
+	pid_t pid = fork();
+	if (pid < 0) { perror("ww: fork"); unlink(tmp); return 1; }
+	if (pid == 0) {
+		int n_extra = argc - next;
+		char **xargv = calloc((size_t)n_extra + 2, sizeof *xargv);
+		xargv[0] = tmp;
+		for (int i = 0; i < n_extra; i++) xargv[i+1] = argv[next + i];
+		xargv[n_extra+1] = NULL;
+		execv(tmp, xargv);
+		perror("ww: exec");
+		_exit(127);
+	}
+	int status = 0;
+	waitpid(pid, &status, 0);
 	unlink(tmp);
-	return rc;
+	if (WIFEXITED(status)) return WEXITSTATUS(status);
+	return 1;
 }
 
 static int
 do_test(int argc, char **argv)
 {
-	(void)argc; (void)argv;
+	const char *target = (argc > 0) ? argv[0] : ".";
-	fputs("ww: test: not implemented in this phase\n", stderr);
+	struct stat st;
+	if (stat(target, &st) != 0) {
+		/* not a literal path — try module resolution and run as
+		 * a single test program. */
+		char resolved[1024];
+		if (!resolve_module(target, "", resolved, sizeof resolved)) {
+			fprintf(stderr, "ww test: cannot find %s\n", target);
 			return 1;
 		}
+		char tmp[1024];
+		snprintf(tmp, sizeof tmp, "/tmp/ww_test_%d", getpid());
+		if (build_one(resolved, tmp, "", "", "") != 0) return 1;
+		int rc = run(tmp);
+		unlink(tmp);
+		return rc;
+	}
+	if (S_ISREG(st.st_mode)) {
+		/* single .ww file — build+run it. */
+		char tmp[1024];
+		snprintf(tmp, sizeof tmp, "/tmp/ww_test_%d", getpid());
+		if (build_one(target, tmp, "", "", "") != 0) return 1;
+		int rc = run(tmp);
+		unlink(tmp);
+		return rc;
+	}
+	if (!S_ISDIR(st.st_mode)) {
+		fprintf(stderr, "ww test: %s is neither file nor directory\n", target);
+		return 1;
+	}
+	/* directory — run every *_test.ww inside. */
+	char **files = NULL;
+	int n = 0;
+	if (collect_tests(target, &files, &n) < 0) {
+		fprintf(stderr, "ww test: cannot read directory %s\n", target);
+		return 1;
+	}
+	if (n == 0) {
+		fprintf(stderr, "ww test: no *_test.ww files in %s\n", target);
+		return 1;
+	}
+	int pass = 0, fail = 0;
+	for (int i = 0; i < n; i++) {
+		char tmp[1024];
+		snprintf(tmp, sizeof tmp, "/tmp/ww_test_%d_%d", getpid(), i);
+		const char *label = strrchr(files[i], '/');
+		label = label ? label + 1 : files[i];
+		int rc = build_one(files[i], tmp, target, "", "");
+		if (rc != 0) {
+			fprintf(stderr, "FAIL %s (build)\n", label);
+			fail++;
+		} else {
+			int xrc = run(tmp);
+			if (xrc == 0) {
+				printf("ok   %s\n", label);
+				pass++;
+			} else {
+				printf("FAIL %s (rc=%d)\n", label, xrc);
+				fail++;
+			}
+		}
+		unlink(tmp);
+		free(files[i]);
+	}
+	free(files);
+	printf("ww test: %d pass, %d fail\n", pass, fail);
+	return fail == 0 ? 0 : 1;
+}
 
 static int
 do_fmt(int argc, char **argv)

cmd/wwdump/main.c

@@ -3,7 +3,7 @@
  *
  * Reads a .ww file and writes either a token stream or an AST
  * s-expression to stdout, byte-for-byte stable across runs. It is the
- * diff anchor for self-host: the C-side libwwc and the future ww-side
+ * diff anchor for self-host: the C-side libwcc and the future ww-side
  * frontend must produce the same dump for the same input.
  *
  *   wwdump -t file.ww   tokens, one per line: "<file>:<l>:<c> <kind> [val]"

examples/snake/Makefile

@@ -1,7 +1,7 @@
-# examples/snake — built with the ww toolchain only (6c → 6a → 6l).
+# examples/snake — built with the ww toolchain only (w6c → w6a → w6l).
 #
 # `ww build` does the whole pipeline. -l ncurses -l c routes through
-# 6l's dynamic linker (PT_INTERP + PT_DYNAMIC + PLT/GOT), so the
+# w6l's dynamic linker (PT_INTERP + PT_DYNAMIC + PLT/GOT), so the
 # resulting binary maps libncurses.so.6 + libc.so.6 at runtime via
 # the system loader. No cc.
 

examples/snake/snake.ww

@@ -3,11 +3,11 @@
 // What this proves:
 //   1. ww the language can express an interactive program.
 //   2. The @symbol FFI mechanism binds to libncurses and libc.
-//   3. 6l's new dynamic linker (PT_INTERP + PT_DYNAMIC + PLT/GOT)
+//   3. w6l's new dynamic linker (PT_INTERP + PT_DYNAMIC + PLT/GOT)
 //      reaches a real .so at runtime — `ldd snake` shows
 //      libncurses.so.6 and libc.so.6 as NEEDED entries.
 //
-// Build: see ./Makefile. Pipeline is the ww toolchain (6c → 6a → 6l)
+// Build: see ./Makefile. Pipeline is the ww toolchain (w6c → w6a → w6l)
 // with -l ncurses -l c. No cc.
 //
 // Controls: w/a/s/d to steer, q to quit.

lib/os/os.ww

@@ -31,6 +31,8 @@ def SYS_EXECVE: i64 = 59;
 def SYS_EXIT:        i64 = 60;
 def SYS_WAIT4:       i64 = 61;
 def SYS_UNLINK:      i64 = 87;
+def SYS_GETCWD:      i64 = 79;
+def SYS_GETDENTS64:  i64 = 217;
 
 // open(2) flags. Linux values, matching <fcntl.h>.
 def O_RDONLY: i32 = 0;
@@ -65,7 +67,7 @@ export fn close(fd: i32) i32 = {
 
 // dup2(2): make `newfd` refer to the same description as `oldfd`,
 // closing `newfd` first if open. Returns `newfd` on success or a
-// negative errno. Used by 6c_ww to redirect stdout into an output
+// negative errno. Used by w6c_ww to redirect stdout into an output
 // file without changing the cgen emit path.
 export fn dup2(oldfd: i32, newfd: i32) i32 = {
 	return syscall2(SYS_DUP2, oldfd: i64, newfd: i64): i32;
@@ -178,3 +180,29 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 	return syscall4(SYS_WAIT4, pid: i64, status_out: i64,
 	    options: i64, rusage: i64): i32;
 };
+
+// getcwd(2) — Linux flavour. Writes the NUL-terminated cwd into `buf`
+// and returns the number of bytes written (including the NUL), or a
+// negative errno. The driver uses it to expand `.` to the cwd's
+// basename for `ww build` / `ww test`.
+export fn getcwd(buf: *u8, n: u64) i64 = {
+	return syscall2(SYS_GETCWD, buf: i64, n: i64);
+};
+
+// getdents64(2) — Linux directory enumeration. The fd must be opened
+// with O_RDONLY on a directory. `buf` receives a packed sequence of
+// linux_dirent64 records:
+//
+//   struct linux_dirent64 {
+//       u64  d_ino;       // 0..7
+//       i64  d_off;       // 8..15
+//       u16  d_reclen;    // 16..17  — total bytes for this record
+//       u8   d_type;      // 18      — DT_REG/DT_DIR/...
+//       u8   d_name[];    // 19..    — NUL-terminated name + padding
+//   };
+//
+// Returns bytes written into `buf` (advance by d_reclen to walk),
+// 0 at end-of-directory, or a negative errno.
+export fn getdents64(fd: i32, buf: *u8, n: u64) i64 = {
+	return syscall3(SYS_GETDENTS64, fd: i64, buf: i64, n: i64);
+};

selfhost/cmd/w6a/asm.ww

@@ -1,10 +1,10 @@
-// selfhost/cmd/6a/asm.ww — port of cmd/6a/asm.c.
+// selfhost/cmd/w6a/asm.ww — port of cmd/w6a/asm.c.
 //
 // Encode the parsed aprog list into amd64 machine bytes, appending to
 // asm_.text. Relocations for CALL/branch targets that resolve to
 // externals are queued in asm_.relocs.
 //
-// Encoding subset matches what 6c emits — see cmd/6a/asm.c for the
+// Encoding subset matches what w6c emits — see cmd/w6a/asm.c for the
 // authoritative list. Helpers (rcode/rhi/modrm/emit_rex etc.) are
 // fully ported; a_encode itself is still a stub pending the full
 // switch over A_*.
@@ -354,7 +354,7 @@ export fn a_encode(a: *asm_) i32 = {
 				a_addreloc(a, reloff, 2, s, -4i64);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVQ shape\n".ptr, 27u64);
+			os.write(2, "w6a: unsupported MOVQ shape\n".ptr, 27u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -374,7 +374,7 @@ export fn a_encode(a: *asm_) i32 = {
 				emit_modrm_mem(a, rcode(tt), p.from.reg, p.from.offset);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVB shape\n".ptr, 27u64);
+			os.write(2, "w6a: unsupported MOVB shape\n".ptr, 27u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -389,7 +389,7 @@ export fn a_encode(a: *asm_) i32 = {
 				emit_modrm_mem(a, rcode(tt), p.from.reg, p.from.offset);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVZBQ shape\n".ptr, 29u64);
+			os.write(2, "w6a: unsupported MOVZBQ shape\n".ptr, 29u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -415,7 +415,7 @@ export fn a_encode(a: *asm_) i32 = {
 				a_emit_byte(a, modrm_byte(3, rcode(ft), rcode(tt)));
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVL shape\n".ptr, 27u64);
+			os.write(2, "w6a: unsupported MOVL shape\n".ptr, 27u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -429,7 +429,7 @@ export fn a_encode(a: *asm_) i32 = {
 				emit_modrm_mem(a, rcode(tt), p.from.reg, p.from.offset);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVSXD shape\n".ptr, 29u64);
+			os.write(2, "w6a: unsupported MOVSXD shape\n".ptr, 29u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -449,7 +449,7 @@ export fn a_encode(a: *asm_) i32 = {
 				sse_mr_load(a, 242u8, 17u8, ft, p.to.reg, p.to.offset);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVSD shape\n".ptr, 28u64);
+			os.write(2, "w6a: unsupported MOVSD shape\n".ptr, 28u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -476,7 +476,7 @@ export fn a_encode(a: *asm_) i32 = {
 				sse_mr_load(a, 243u8, 17u8, ft, p.to.reg, p.to.offset);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVSS shape\n".ptr, 28u64);
+			os.write(2, "w6a: unsupported MOVSS shape\n".ptr, 28u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -651,7 +651,7 @@ export fn a_encode(a: *asm_) i32 = {
 			p = p.link; continue;
 		};
 
-		os.write(2, "6a: unsupported opcode\n".ptr, 23u64);
+		os.write(2, "w6a: unsupported opcode\n".ptr, 23u64);
 		a.errs += 1;
 		p = p.link;
 	};
@@ -660,7 +660,7 @@ export fn a_encode(a: *asm_) i32 = {
 	let f: *afixup = a.fixups;
 	for (f != nil) {
 		if (!label_defined(a, f.label)) {
-			os.write(2, "6a: undefined label '".ptr, 21u64);
+			os.write(2, "w6a: undefined label '".ptr, 21u64);
 			let lbl: str = f.label;
 			os.write(2, lbl.ptr, lbl.len: u64);
 			os.write(2, "'\n".ptr, 2u64);

selfhost/cmd/w6a/lex.ww

@@ -1,6 +1,6 @@
-// selfhost/cmd/6a/lex.ww — port of cmd/6a/lex.c.
+// selfhost/cmd/w6a/lex.ww — port of cmd/w6a/lex.c.
 //
-// Character-level helpers for 6a's line-oriented parser. The parser
+// Character-level helpers for w6a's line-oriented parser. The parser
 // itself is in parse.ww; here we keep tokenisers for identifiers and
 // numbers so parse.ww stays focused on syntax.
 

selfhost/cmd/w6a/main.combined.ww

@@ -31,6 +31,8 @@ def SYS_EXECVE: i64 = 59;
 def SYS_EXIT:        i64 = 60;
 def SYS_WAIT4:       i64 = 61;
 def SYS_UNLINK:      i64 = 87;
+def SYS_GETCWD:      i64 = 79;
+def SYS_GETDENTS64:  i64 = 217;
 
 // open(2) flags. Linux values, matching <fcntl.h>.
 def O_RDONLY: i32 = 0;
@@ -65,7 +67,7 @@ export fn close(fd: i32) i32 = {
 
 // dup2(2): make `newfd` refer to the same description as `oldfd`,
 // closing `newfd` first if open. Returns `newfd` on success or a
-// negative errno. Used by 6c_ww to redirect stdout into an output
+// negative errno. Used by w6c_ww to redirect stdout into an output
 // file without changing the cgen emit path.
 export fn dup2(oldfd: i32, newfd: i32) i32 = {
 	return syscall2(SYS_DUP2, oldfd: i64, newfd: i64): i32;
@@ -179,7 +181,33 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 	    options: i64, rusage: i64): i32;
 };
 
-// selfhost/cmd/wwc/mem.ww — port of cmd/wwc/mem.c.
+// getcwd(2) — Linux flavour. Writes the NUL-terminated cwd into `buf`
+// and returns the number of bytes written (including the NUL), or a
+// negative errno. The driver uses it to expand `.` to the cwd's
+// basename for `ww build` / `ww test`.
+export fn getcwd(buf: *u8, n: u64) i64 = {
+	return syscall2(SYS_GETCWD, buf: i64, n: i64);
+};
+
+// getdents64(2) — Linux directory enumeration. The fd must be opened
+// with O_RDONLY on a directory. `buf` receives a packed sequence of
+// linux_dirent64 records:
+//
+//   struct linux_dirent64 {
+//       u64  d_ino;       // 0..7
+//       i64  d_off;       // 8..15
+//       u16  d_reclen;    // 16..17  — total bytes for this record
+//       u8   d_type;      // 18      — DT_REG/DT_DIR/...
+//       u8   d_name[];    // 19..    — NUL-terminated name + padding
+//   };
+//
+// Returns bytes written into `buf` (advance by d_reclen to walk),
+// 0 at end-of-directory, or a negative errno.
+export fn getdents64(fd: i32, buf: *u8, n: u64) i64 = {
+	return syscall3(SYS_GETDENTS64, fd: i64, buf: i64, n: i64);
+};
+
+// selfhost/cmd/wcc/mem.ww — port of cmd/wcc/mem.c.
 //
 // Bump arena allocator. Backed by the runtime page allocator
 // (rt_alloc / rt_free), no libc. Each chunk is mmap'd; when the
@@ -187,7 +215,7 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 // unmaps the chain.
 //
 // Memory handed out is 16-byte aligned. The C version under
-// cmd/wwc/ is retained until the three-stage bootstrap diffs clean.
+// cmd/wcc/ is retained until the three-stage bootstrap diffs clean.
 
 use os;
 
@@ -286,15 +314,15 @@ export fn freearena(a: *arena) void = {
 	};
 };
 
-// selfhost/cmd/6a/types.ww — types + constants shared across the
+// selfhost/cmd/w6a/types.ww — types + constants shared across the
-// 6a port. Mirrors cmd/6a/a.h and cmd/6c/6.out.h.
+// w6a port. Mirrors cmd/w6a/a.h and cmd/w6c/6.out.h.
 
 use mem;
 
 // ---- registers + operand kinds (from 6.out.h) -------------------------
 // These must stay numerically aligned with the C enum so that ww-cgen
 // output (which reads them via `D_AX(SB)` etc.) lands on the same
-// integers when read by ww-6a.
+// integers when read by ww-w6a.
 def D_NONE: i32 = 0;
 
 def D_AX: i32 = 1;
@@ -409,7 +437,7 @@ def A_JNZ:  i32 = 58;
 
 def A_SYSCALL: i32 = 59;
 
-// ---- structs (mirror cmd/6a/a.h) --------------------------------------
+// ---- structs (mirror cmd/w6a/a.h) --------------------------------------
 
 type aoperand = struct {
 	atype:  i32,	// D_NONE / D_AX..D_R15 / D_CONST / D_INDIR / D_EXTERN / D_BRANCH
@@ -480,9 +508,9 @@ type asm_ = struct {
 	errs:    i32,
 };
 
-// selfhost/cmd/6a/lex.ww — port of cmd/6a/lex.c.
+// selfhost/cmd/w6a/lex.ww — port of cmd/w6a/lex.c.
 //
-// Character-level helpers for 6a's line-oriented parser. The parser
+// Character-level helpers for w6a's line-oriented parser. The parser
 // itself is in parse.ww; here we keep tokenisers for identifiers and
 // numbers so parse.ww stays focused on syntax.
 
@@ -547,9 +575,9 @@ export fn a_parsenum(p: *u8, n: u64) (i64, u64) = {
 	return v, i;
 };
 
-// selfhost/cmd/6a/parse.ww — port of cmd/6a/parse.c.
+// selfhost/cmd/w6a/parse.ww — port of cmd/w6a/parse.c.
 //
-// Line-oriented parser for the asm subset emitted by 6c.
+// Line-oriented parser for the asm subset emitted by w6c.
 // Grammar:
 //   line  := blank | comment | label | text | instr
 //   blank := /^\s*$/
@@ -719,7 +747,7 @@ export fn a_intern(a: *asm_, name: str) *asym = {
 };
 
 fn perr(a: *asm_, msg: str) void = {
-	os.write(2, "6a: ".ptr, 4u64);
+	os.write(2, "w6a: ".ptr, 4u64);
 	let f: str = a.file;
 	os.write(2, f.ptr, f.len: u64);
 	os.write(2, ": ".ptr, 2u64);
@@ -1131,13 +1159,13 @@ export fn a_parse(a: *asm_) i32 = {
 	return a.errs;
 };
 
-// selfhost/cmd/6a/asm.ww — port of cmd/6a/asm.c.
+// selfhost/cmd/w6a/asm.ww — port of cmd/w6a/asm.c.
 //
 // Encode the parsed aprog list into amd64 machine bytes, appending to
 // asm_.text. Relocations for CALL/branch targets that resolve to
 // externals are queued in asm_.relocs.
 //
-// Encoding subset matches what 6c emits — see cmd/6a/asm.c for the
+// Encoding subset matches what w6c emits — see cmd/w6a/asm.c for the
 // authoritative list. Helpers (rcode/rhi/modrm/emit_rex etc.) are
 // fully ported; a_encode itself is still a stub pending the full
 // switch over A_*.
@@ -1487,7 +1515,7 @@ export fn a_encode(a: *asm_) i32 = {
 				a_addreloc(a, reloff, 2, s, -4i64);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVQ shape\n".ptr, 27u64);
+			os.write(2, "w6a: unsupported MOVQ shape\n".ptr, 27u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -1507,7 +1535,7 @@ export fn a_encode(a: *asm_) i32 = {
 				emit_modrm_mem(a, rcode(tt), p.from.reg, p.from.offset);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVB shape\n".ptr, 27u64);
+			os.write(2, "w6a: unsupported MOVB shape\n".ptr, 27u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -1522,7 +1550,7 @@ export fn a_encode(a: *asm_) i32 = {
 				emit_modrm_mem(a, rcode(tt), p.from.reg, p.from.offset);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVZBQ shape\n".ptr, 29u64);
+			os.write(2, "w6a: unsupported MOVZBQ shape\n".ptr, 29u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -1548,7 +1576,7 @@ export fn a_encode(a: *asm_) i32 = {
 				a_emit_byte(a, modrm_byte(3, rcode(ft), rcode(tt)));
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVL shape\n".ptr, 27u64);
+			os.write(2, "w6a: unsupported MOVL shape\n".ptr, 27u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -1562,7 +1590,7 @@ export fn a_encode(a: *asm_) i32 = {
 				emit_modrm_mem(a, rcode(tt), p.from.reg, p.from.offset);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVSXD shape\n".ptr, 29u64);
+			os.write(2, "w6a: unsupported MOVSXD shape\n".ptr, 29u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -1582,7 +1610,7 @@ export fn a_encode(a: *asm_) i32 = {
 				sse_mr_load(a, 242u8, 17u8, ft, p.to.reg, p.to.offset);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVSD shape\n".ptr, 28u64);
+			os.write(2, "w6a: unsupported MOVSD shape\n".ptr, 28u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -1609,7 +1637,7 @@ export fn a_encode(a: *asm_) i32 = {
 				sse_mr_load(a, 243u8, 17u8, ft, p.to.reg, p.to.offset);
 				p = p.link; continue;
 			};};
-			os.write(2, "6a: unsupported MOVSS shape\n".ptr, 28u64);
+			os.write(2, "w6a: unsupported MOVSS shape\n".ptr, 28u64);
 			a.errs += 1;
 			p = p.link; continue;
 		};
@@ -1784,7 +1812,7 @@ export fn a_encode(a: *asm_) i32 = {
 			p = p.link; continue;
 		};
 
-		os.write(2, "6a: unsupported opcode\n".ptr, 23u64);
+		os.write(2, "w6a: unsupported opcode\n".ptr, 23u64);
 		a.errs += 1;
 		p = p.link;
 	};
@@ -1793,7 +1821,7 @@ export fn a_encode(a: *asm_) i32 = {
 	let f: *afixup = a.fixups;
 	for (f != nil) {
 		if (!label_defined(a, f.label)) {
-			os.write(2, "6a: undefined label '".ptr, 21u64);
+			os.write(2, "w6a: undefined label '".ptr, 21u64);
 			let lbl: str = f.label;
 			os.write(2, lbl.ptr, lbl.len: u64);
 			os.write(2, "'\n".ptr, 2u64);
@@ -1813,7 +1841,7 @@ export fn a_encode(a: *asm_) i32 = {
 	return a.errs;
 };
 
-// selfhost/cmd/6a/obj.ww — port of cmd/6a/obj.c.
+// selfhost/cmd/w6a/obj.ww — port of cmd/w6a/obj.c.
 //
 // Emit a tiny ELF64 relocatable object. Layout (in file order):
 //   [0] ELF header
@@ -2107,11 +2135,11 @@ export fn a_emit_elf(a: *asm_, fd: i32) i32 = {
 	return 0;
 };
 
-// selfhost/cmd/6a/main.ww — port of cmd/6a/main.c.
+// selfhost/cmd/w6a/main.ww — port of cmd/w6a/main.c.
 //
-// 6a = amd64 assembler. Read .s, parse, encode, emit ELF .o.
+// w6a = amd64 assembler. Read .s, parse, encode, emit ELF .o.
 //
-//   6a_ww -o file.o file.s
+//   w6a_ww -o file.o file.s
 
 use os;
 use mem;
@@ -2164,16 +2192,16 @@ export fn main(argc: i32, argv: **u8) i32 = {
 		if (streq_cs(a, "-o")) {
 			i += 1;
 			if (i >= argc) {
-				os.write(2, "6a: -o requires arg\n".ptr, 20u64);
+				os.write(2, "w6a: -o requires arg\n".ptr, 20u64);
 				return 2;
 			};
 			out_cs = argv[i];
 		} else { if (a[0u64] == 45u8) {
-			os.write(2, "6a: unknown flag\n".ptr, 17u64);
+			os.write(2, "w6a: unknown flag\n".ptr, 17u64);
 			return 2;
 		} else {
 			if (src_cs != nil) {
-				os.write(2, "6a: only one input\n".ptr, 19u64);
+				os.write(2, "w6a: only one input\n".ptr, 19u64);
 				return 2;
 			};
 			src_cs = a;
@@ -2182,11 +2210,11 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	};
 
 	if (src_cs == nil) {
-		os.write(2, "usage: 6a_ww -o file.o file.s\n".ptr, 30u64);
+		os.write(2, "usage: w6a_ww -o file.o file.s\n".ptr, 30u64);
 		return 2;
 	};
 	if (out_cs == nil) {
-		os.write(2, "6a: missing -o\n".ptr, 15u64);
+		os.write(2, "w6a: missing -o\n".ptr, 15u64);
 		return 2;
 	};
 
@@ -2194,7 +2222,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	let blen: u64;
 	buf, blen = slurp(src_cs);
 	if (buf == nil) {
-		os.write(2, "6a: cannot read input\n".ptr, 22u64);
+		os.write(2, "w6a: cannot read input\n".ptr, 22u64);
 		return 1;
 	};
 
@@ -2210,7 +2238,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	// Open output for write.
 	let fd: i32 = os.open(out_cs, os.O_WRONLY | os.O_CREAT | os.O_TRUNC, 420i32);	// 0o644
 	if (fd < 0) {
-		os.write(2, "6a: cannot open output\n".ptr, 23u64);
+		os.write(2, "w6a: cannot open output\n".ptr, 23u64);
 		return 1;
 	};
 	let rc: i32 = a_emit_elf(&asm, fd);

selfhost/cmd/w6a/main.ww

@@ -1,8 +1,8 @@
-// selfhost/cmd/6a/main.ww — port of cmd/6a/main.c.
+// selfhost/cmd/w6a/main.ww — port of cmd/w6a/main.c.
 //
-// 6a = amd64 assembler. Read .s, parse, encode, emit ELF .o.
+// w6a = amd64 assembler. Read .s, parse, encode, emit ELF .o.
 //
-//   6a_ww -o file.o file.s
+//   w6a_ww -o file.o file.s
 
 use os;
 use mem;
@@ -55,16 +55,16 @@ export fn main(argc: i32, argv: **u8) i32 = {
 		if (streq_cs(a, "-o")) {
 			i += 1;
 			if (i >= argc) {
-				os.write(2, "6a: -o requires arg\n".ptr, 20u64);
+				os.write(2, "w6a: -o requires arg\n".ptr, 20u64);
 				return 2;
 			};
 			out_cs = argv[i];
 		} else { if (a[0u64] == 45u8) {
-			os.write(2, "6a: unknown flag\n".ptr, 17u64);
+			os.write(2, "w6a: unknown flag\n".ptr, 17u64);
 			return 2;
 		} else {
 			if (src_cs != nil) {
-				os.write(2, "6a: only one input\n".ptr, 19u64);
+				os.write(2, "w6a: only one input\n".ptr, 19u64);
 				return 2;
 			};
 			src_cs = a;
@@ -73,11 +73,11 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	};
 
 	if (src_cs == nil) {
-		os.write(2, "usage: 6a_ww -o file.o file.s\n".ptr, 30u64);
+		os.write(2, "usage: w6a_ww -o file.o file.s\n".ptr, 30u64);
 		return 2;
 	};
 	if (out_cs == nil) {
-		os.write(2, "6a: missing -o\n".ptr, 15u64);
+		os.write(2, "w6a: missing -o\n".ptr, 15u64);
 		return 2;
 	};
 
@@ -85,7 +85,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	let blen: u64;
 	buf, blen = slurp(src_cs);
 	if (buf == nil) {
-		os.write(2, "6a: cannot read input\n".ptr, 22u64);
+		os.write(2, "w6a: cannot read input\n".ptr, 22u64);
 		return 1;
 	};
 
@@ -101,7 +101,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	// Open output for write.
 	let fd: i32 = os.open(out_cs, os.O_WRONLY | os.O_CREAT | os.O_TRUNC, 420i32);	// 0o644
 	if (fd < 0) {
-		os.write(2, "6a: cannot open output\n".ptr, 23u64);
+		os.write(2, "w6a: cannot open output\n".ptr, 23u64);
 		return 1;
 	};
 	let rc: i32 = a_emit_elf(&asm, fd);

selfhost/cmd/w6a/obj.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/6a/obj.ww — port of cmd/6a/obj.c.
+// selfhost/cmd/w6a/obj.ww — port of cmd/w6a/obj.c.
 //
 // Emit a tiny ELF64 relocatable object. Layout (in file order):
 //   [0] ELF header

selfhost/cmd/w6a/parse.ww

@@ -1,6 +1,6 @@
-// selfhost/cmd/6a/parse.ww — port of cmd/6a/parse.c.
+// selfhost/cmd/w6a/parse.ww — port of cmd/w6a/parse.c.
 //
-// Line-oriented parser for the asm subset emitted by 6c.
+// Line-oriented parser for the asm subset emitted by w6c.
 // Grammar:
 //   line  := blank | comment | label | text | instr
 //   blank := /^\s*$/
@@ -170,7 +170,7 @@ export fn a_intern(a: *asm_, name: str) *asym = {
 };
 
 fn perr(a: *asm_, msg: str) void = {
-	os.write(2, "6a: ".ptr, 4u64);
+	os.write(2, "w6a: ".ptr, 4u64);
 	let f: str = a.file;
 	os.write(2, f.ptr, f.len: u64);
 	os.write(2, ": ".ptr, 2u64);

selfhost/cmd/w6a/types.ww

@@ -1,12 +1,12 @@
-// selfhost/cmd/6a/types.ww — types + constants shared across the
+// selfhost/cmd/w6a/types.ww — types + constants shared across the
-// 6a port. Mirrors cmd/6a/a.h and cmd/6c/6.out.h.
+// w6a port. Mirrors cmd/w6a/a.h and cmd/w6c/6.out.h.
 
 use mem;
 
 // ---- registers + operand kinds (from 6.out.h) -------------------------
 // These must stay numerically aligned with the C enum so that ww-cgen
 // output (which reads them via `D_AX(SB)` etc.) lands on the same
-// integers when read by ww-6a.
+// integers when read by ww-w6a.
 def D_NONE: i32 = 0;
 
 def D_AX: i32 = 1;
@@ -121,7 +121,7 @@ def A_JNZ:  i32 = 58;
 
 def A_SYSCALL: i32 = 59;
 
-// ---- structs (mirror cmd/6a/a.h) --------------------------------------
+// ---- structs (mirror cmd/w6a/a.h) --------------------------------------
 
 type aoperand = struct {
 	atype:  i32,	// D_NONE / D_AX..D_R15 / D_CONST / D_INDIR / D_EXTERN / D_BRANCH

selfhost/cmd/w6c/main.combined.ww

@@ -31,6 +31,8 @@ def SYS_EXECVE: i64 = 59;
 def SYS_EXIT:        i64 = 60;
 def SYS_WAIT4:       i64 = 61;
 def SYS_UNLINK:      i64 = 87;
+def SYS_GETCWD:      i64 = 79;
+def SYS_GETDENTS64:  i64 = 217;
 
 // open(2) flags. Linux values, matching <fcntl.h>.
 def O_RDONLY: i32 = 0;
@@ -65,7 +67,7 @@ export fn close(fd: i32) i32 = {
 
 // dup2(2): make `newfd` refer to the same description as `oldfd`,
 // closing `newfd` first if open. Returns `newfd` on success or a
-// negative errno. Used by 6c_ww to redirect stdout into an output
+// negative errno. Used by w6c_ww to redirect stdout into an output
 // file without changing the cgen emit path.
 export fn dup2(oldfd: i32, newfd: i32) i32 = {
 	return syscall2(SYS_DUP2, oldfd: i64, newfd: i64): i32;
@@ -179,7 +181,33 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 	    options: i64, rusage: i64): i32;
 };
 
-// selfhost/cmd/wwc/mem.ww — port of cmd/wwc/mem.c.
+// getcwd(2) — Linux flavour. Writes the NUL-terminated cwd into `buf`
+// and returns the number of bytes written (including the NUL), or a
+// negative errno. The driver uses it to expand `.` to the cwd's
+// basename for `ww build` / `ww test`.
+export fn getcwd(buf: *u8, n: u64) i64 = {
+	return syscall2(SYS_GETCWD, buf: i64, n: i64);
+};
+
+// getdents64(2) — Linux directory enumeration. The fd must be opened
+// with O_RDONLY on a directory. `buf` receives a packed sequence of
+// linux_dirent64 records:
+//
+//   struct linux_dirent64 {
+//       u64  d_ino;       // 0..7
+//       i64  d_off;       // 8..15
+//       u16  d_reclen;    // 16..17  — total bytes for this record
+//       u8   d_type;      // 18      — DT_REG/DT_DIR/...
+//       u8   d_name[];    // 19..    — NUL-terminated name + padding
+//   };
+//
+// Returns bytes written into `buf` (advance by d_reclen to walk),
+// 0 at end-of-directory, or a negative errno.
+export fn getdents64(fd: i32, buf: *u8, n: u64) i64 = {
+	return syscall3(SYS_GETDENTS64, fd: i64, buf: i64, n: i64);
+};
+
+// selfhost/cmd/wcc/mem.ww — port of cmd/wcc/mem.c.
 //
 // Bump arena allocator. Backed by the runtime page allocator
 // (rt_alloc / rt_free), no libc. Each chunk is mmap'd; when the
@@ -187,7 +215,7 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 // unmaps the chain.
 //
 // Memory handed out is 16-byte aligned. The C version under
-// cmd/wwc/ is retained until the three-stage bootstrap diffs clean.
+// cmd/wcc/ is retained until the three-stage bootstrap diffs clean.
 
 use os;
 
@@ -406,8 +434,8 @@ export fn parseu64(s: str) (u64 | str) = {
 	return v;
 };
 
-// selfhost/cmd/wwc/tok.ww — port of cmd/wwc/tok.c plus the Tkind /
+// selfhost/cmd/wcc/tok.ww — port of cmd/wcc/tok.c plus the Tkind /
-// Tok / Pos shapes from cmd/wwc/ww.h.
+// Tok / Pos shapes from cmd/wcc/ww.h.
 //
 // Token kind values must stay numerically equal to the C side: the
 // 990_selfhost test diffs ww-side wwdump output against C-side
@@ -415,13 +443,13 @@ export fn parseu64(s: str) (u64 | str) = {
 // integers and breaks the diff.
 //
 // Bottom of file: tokprint, which emits one token per line in a
-// format identical to cmd/wwc/tok.c:tokprint().
+// format identical to cmd/wcc/tok.c:tokprint().
 
 use os;
 use strconv;
 
 // ---- Tkind ------------------------------------------------------------
-// Mirror of the C enum in cmd/wwc/ww.h. Don't reorder.
+// Mirror of the C enum in cmd/wcc/ww.h. Don't reorder.
 
 def TK_NONE:     i32 = 0;
 def TK_EOF:      i32 = 1;
@@ -516,7 +544,7 @@ def TK_LAST: i32 = 80;
 // ---- Pos / Tok --------------------------------------------------------
 //
 // `pos` is used at error-reporting boundaries; we always pass it via
-// *pos so the value never gets struct-copied (6c can't yet copy a
+// *pos so the value never gets struct-copied (w6c can't yet copy a
 // 24-byte struct).
 //
 // `tok` is flat — file/line/col live directly on the token rather than
@@ -554,7 +582,7 @@ fn streq_n(a: *u8, b: str, n: i32) bool = {
 
 // kwlookup — returns the matching TK_* keyword kind for a byte run,
 // or TK_NONE if it's an ordinary identifier. Linear search over a
-// small alphabetised list, matching cmd/wwc/tok.c.
+// small alphabetised list, matching cmd/wcc/tok.c.
 export fn kwlookup(p: *u8, n: i32) i32 = {
 	if (streq_n(p, "as", n))       { return TK_AS; };
 	if (streq_n(p, "break", n))    { return TK_BREAK; };
@@ -683,7 +711,7 @@ export fn tokname(k: i32) str = {
 
 // ---- writer for tokprint ----------------------------------------------
 //
-// fputq mirrors cmd/wwc/tok.c:fputq — quote the string with C-style
+// fputq mirrors cmd/wcc/tok.c:fputq — quote the string with C-style
 // escapes for \, ", \n, \t, \r and \xNN for other non-printables.
 
 fn fputc_byte(fd: i32, b: u8) void = {
@@ -750,14 +778,14 @@ fn fputq(fd: i32, p: *u8, n: i32) void = {
 };
 
 // tokprint — write one token line to fd. Format must match
-// cmd/wwc/tok.c:tokprint() byte-for-byte: that's the diff anchor.
+// cmd/wcc/tok.c:tokprint() byte-for-byte: that's the diff anchor.
 //   "<file>:<line>:<col> <kindname>[ <value>]\n"
 //
-// Takes `t` by pointer because 6c can't yet pass a >16-byte struct
+// Takes `t` by pointer because w6c can't yet pass a >16-byte struct
 // by value; the C version takes Tok by value.
 export fn tokprint(fd: i32, t: *tok) void = {
 	// Chained-dot field reads (`t.x.y`) on str sub-fields aren't yet
-	// reduced by 6c — `t.x.y` returns the whole str. Lift the str
+	// reduced by w6c — `t.x.y` returns the whole str. Lift the str
 	// fields into locals so we can use the str pseudo-field path.
 	let tfile: str = t.file;
 	let ttext: str = t.text;
@@ -894,14 +922,14 @@ export fn toupper(c: u8) u8 = {
 	return c;
 };
 
-// selfhost/cmd/wwc/lex.ww — port of cmd/wwc/lex.c.
+// selfhost/cmd/wcc/lex.ww — port of cmd/wcc/lex.c.
 //
 // The DFA, the helpers, and the order of decisions all mirror the C
 // version exactly. The 990_selfhost test diffs the resulting token
 // stream against the C-side wwdump byte-for-byte; any divergence is
 // a port bug.
 //
-// Calling-convention note: 6c can't yet pass or return structs >16
+// Calling-convention note: w6c can't yet pass or return structs >16
 // bytes by value, so `tok` and `pos` are passed by pointer (out
 // params). The C version passes `Tok` by value; we differ here only
 // in shape, not in observable behaviour. Token kind values stay
@@ -1551,7 +1579,7 @@ export fn lexnext(l: *lex, out: *tok) void = {
 	out.text = astrndup(l.a, one.ptr, 1u64);
 };
 
-// selfhost/cmd/wwc/ast.ww — port of cmd/wwc/ast.c (Node defs + printer).
+// selfhost/cmd/wcc/ast.ww — port of cmd/wcc/ast.c (Node defs + printer).
 //
 // Status: AST printer is fully ported. Constructor `newnode` is here.
 // The parser (parse.ww) is currently minimal — see its file header.
@@ -1567,7 +1595,7 @@ use tok;
 
 // ---- Nkind ------------------------------------------------------------
 //
-// Mirror of cmd/wwc/ww.h Nkind. Values must stay numerically equal so
+// Mirror of cmd/wcc/ww.h Nkind. Values must stay numerically equal so
 // the AST diff probe in 990_selfhost works.
 
 def N_NONE:     i32 = 0;
@@ -1887,7 +1915,7 @@ export fn astprint(fd: i32, n: *node) void = {
 	pr(fd, n, 0);
 };
 
-// selfhost/cmd/wwc/parse.ww — port of cmd/wwc/parse.c.
+// selfhost/cmd/wcc/parse.ww — port of cmd/wcc/parse.c.
 //
 // Status: GROWING stub. Currently handles top-level `use IDENT;`,
 // `def NAME: TYPE = LIT;`, `type NAME = TYPE;`, and `fn NAME(params)
@@ -1900,7 +1928,7 @@ export fn astprint(fd: i32, n: *node) void = {
 // surface form lands here gradually so the AST diff in 990_selfhost
 // grows toward whole-language coverage one increment at a time.
 //
-// Calling-convention shim: 6c can't yet pass a sub-struct field
+// Calling-convention shim: w6c can't yet pass a sub-struct field
 // (e.g. p.cur.line where p.cur is a `tok` of size 76). The parser
 // stores the current token as flat primitive fields rather than a
 // nested `tok` struct; `refill` copies a freshly lexed token in.
@@ -2635,7 +2663,7 @@ fn parsestmt(p: *parser) *node = {
 	};
 	// expression statement, or tuple-destructure multi-assign:
 	//   a, b = expr;
-	// Mirrors cmd/wwc/parse.c:1015-1031. We parse the first lvalue
+	// Mirrors cmd/wcc/parse.c:1015-1031. We parse the first lvalue
 	// with parseexpr (matches the C side); subsequent lvalues go
 	// through parsebin(parseunary, 1) so the `=` stays for us to
 	// consume — parseexpr would absorb it.
@@ -2870,7 +2898,7 @@ export fn parsefile(p: *parser) *node = {
 	return f;
 };
 
-// selfhost/cmd/wwc/type.ww — port of cmd/wwc/type.c.
+// selfhost/cmd/wcc/type.ww — port of cmd/wcc/type.c.
 //
 // Status: full structural port. The C version uses module-globals for
 // the primitive types (ty_void, ty_i32, …); ww doesn't have writable
@@ -2882,7 +2910,7 @@ use os;
 use mem;
 
 // ---- TypeKind ---------------------------------------------------------
-// Numeric values must stay aligned with cmd/wwc/ww.h TypeKind so the
+// Numeric values must stay aligned with cmd/wcc/ww.h TypeKind so the
 // next diff signal (typed-AST printer / cgen) can compare across the
 // two implementations.
 
@@ -3200,7 +3228,7 @@ export fn type_eq(a: *tinfo, b: *tinfo) bool = {
 	return true;	// primitives match by kind alone
 };
 
-// selfhost/cmd/wwc/sym.ww — port of cmd/wwc/sym.c.
+// selfhost/cmd/wcc/sym.ww — port of cmd/wcc/sym.c.
 //
 // Per-scope hashtable, chained to the parent. Lookup walks up.
 // Plan 9 / Hare flavoured. Duplicate definitions in the same scope
@@ -3210,7 +3238,7 @@ use mem;
 use typ;
 use ast;
 
-// Symbol kinds — must stay numerically aligned with cmd/wwc/ww.h Skind.
+// Symbol kinds — must stay numerically aligned with cmd/wcc/ww.h Skind.
 def SK_NONE:  i32 = 0;
 def SK_VAR:   i32 = 1;
 def SK_PARAM: i32 = 2;
@@ -3314,11 +3342,11 @@ export fn scope_define(s: *scope, name: str, k: i32, t: *tinfo, decl: *node) *sy
 	return sy;
 };
 
-// selfhost/cmd/wwc/check.ww — minimal port of cmd/wwc/check.c.
+// selfhost/cmd/wcc/check.ww — minimal port of cmd/wcc/check.c.
 //
 // Status: name-resolution + primitive-type seeding only. Full type
 // inference, conversion rules, tagged-union dispatch typing, return-
-// type checking, etc. all live in cmd/wwc/check.c (937 lines) and
+// type checking, etc. all live in cmd/wcc/check.c (937 lines) and
 // will land here in subsequent commits.
 //
 // What this version does:
@@ -3562,10 +3590,10 @@ export fn check_file(c: *checker, file: *node) void = {
 	};
 };
 
-// selfhost/cmd/wwc/cgen.ww — port of cmd/6c/cgen.c.
+// selfhost/cmd/wcc/cgen.ww — port of cmd/w6c/cgen.c.
 //
 // Status: GROWING. Each subsystem we add is verified by `wwdump_ww -c`
-// producing byte-identical output to C-side `6c` for the same source,
+// producing byte-identical output to C-side `w6c` for the same source,
 // then by assembling + linking + running the result.
 //
 // Current coverage:
@@ -3760,7 +3788,7 @@ fn local_alloc(c: *cgen, name: str, sz: i32, tnode: *node) i32 = {
 fn local_add(c: *cgen, name: str, sz: i32, tnode: *node) i32 = {
 	// Name-based slot reuse for N_LETs and params: if `name` is
 	// already declared in this function, return its existing
-	// offset. Mirrors C cgen (cmd/6c/cgen.c:localoff). Two
+	// offset. Mirrors C cgen (cmd/w6c/cgen.c:localoff). Two
 	// disjoint scopes that declare the same name share one slot —
 	// so `escape` in wwdump (three `let cp: pos;` across separate
 	// branches) reserves one slot, not three. scan_locals does
@@ -4097,7 +4125,7 @@ fn fnret_lookup(c: *cgen, name: str) *node = {
 
 // ---- def-constant registry ------------------------------------------
 //
-// `def NAME: T = LIT;` becomes a DATA symbol the C-side 6c emits; an
+// `def NAME: T = LIT;` becomes a DATA symbol the C-side w6c emits; an
 // ident reference loads it via `MOVQ NAME(SB), AX`. We collect them at
 // file load and consult on N_IDENT lookup.
 
@@ -4725,7 +4753,7 @@ fn node_isunsigned(c: *cgen, n: *node) bool = {
 	// Walks the base local's declared type and pulls the element
 	// out — *u8 → u8, [N]u32 → u32, []u64 → u64. Without this the
 	// compare-codegen for `p[i] >= 48u8` falls back to signed JGE
-	// instead of JAE, diverging from C 6c on byte indexing.
+	// instead of JAE, diverging from C w6c on byte indexing.
 	if (k == N_INDEX) {
 		let base: *node = n.lhs;
 		if (base != nil) {
@@ -5198,7 +5226,7 @@ fn cgexpr(c: *cgen, n: *node) void = {
 		// path the cgen falls through and AX retains whatever the
 		// inner expression left there — typically the *struct pointer
 		// itself, so reads silently get the pointer value instead of
-		// the field. (Showed up porting 6l/pass.ww.)
+		// the field. (Showed up porting w6l/pass.ww.)
 		if (lhs != nil) {
 			if (lhs.kind == N_DOT) {
 				let inner_t: *node = dot_inner_struct_ptr(c, lhs);
@@ -5487,7 +5515,7 @@ fn cgexpr(c: *cgen, n: *node) void = {
 						};
 						cgexpr(c, n.rhs);
 						// Push order matches C cgen
-						// (cmd/6c/cgen.c:1033-1041): PUSHQ AX
+						// (cmd/w6c/cgen.c:1033-1041): PUSHQ AX
 						// (ptr) first, then PUSHQ BX (len) if
 						// str, so the pop sequence is POP CX
 						// (len) → POP AX (ptr) → MOVQ AX,
@@ -6259,7 +6287,7 @@ fn cgstmt(c: *cgen, n: *node) void = {
 			};
 		} else {
 			// Bare `let x: T;` with no initializer. C cgen
-			// (cmd/6c/cgen.c:2181-2183) zero-inits only when
+			// (cmd/w6c/cgen.c:2181-2183) zero-inits only when
 			// the underlying type's natural size is 8 — pointers,
 			// i64/u64, function pointers, ints. Structs/arrays/
 			// slices/strings/tagged/tuples are left for per-field
@@ -6330,7 +6358,7 @@ fn cgstmt(c: *cgen, n: *node) void = {
 	// Tuple-destructure assign: `a, b = call();`. The call's tuple
 	// return lands in (AX, DX); push DX to free it, store AX into
 	// the first lvalue, then pop DX into the second. Mirrors
-	// cmd/6c/cgen.c:2424-2440. Lvalues beyond two are dropped (same
+	// cmd/w6c/cgen.c:2424-2440. Lvalues beyond two are dropped (same
 	// as C — no fixture uses >2 today).
 	if (k == N_MASSIGN) {
 		if (n.rhs != nil) { cgexpr(c, n.rhs); };
@@ -6645,14 +6673,14 @@ export fn cg_file(c: *cgen, file: *node) void = {
 	emit_def_constants(c, file);
 };
 
-// selfhost/cmd/6c/main.ww — port of cmd/6c/main.c.
+// selfhost/cmd/w6c/main.ww — port of cmd/w6c/main.c.
 //
-// 6c = amd64 compiler. Read .ww, parse, codegen, emit Plan 9 amd64
+// w6c = amd64 compiler. Read .ww, parse, codegen, emit Plan 9 amd64
 // asm to stdout (or the file given by -o).
 //
-//   6c_ww -o file.s file.ww
+//   w6c_ww -o file.s file.ww
 //
-// The cgen routines in selfhost/cmd/wwc/cgen.ww write directly to
+// The cgen routines in selfhost/cmd/wcc/cgen.ww write directly to
 // fd 1 via os.write(1, ...). For -o, we open the output file and
 // dup2 it onto fd 1 before invoking cg_file. This is the same trick
 // the bootstrap uses with shell redirection, just in-process.
@@ -6710,16 +6738,16 @@ export fn main(argc: i32, argv: **u8) i32 = {
 		if (streq_cs(a, "-o")) {
 			i += 1;
 			if (i >= argc) {
-				os.write(2, "6c: -o requires arg\n".ptr, 20u64);
+				os.write(2, "w6c: -o requires arg\n".ptr, 20u64);
 				return 2;
 			};
 			out_cs = argv[i];
 		} else { if (a[0u64] == 45u8) {
-			os.write(2, "6c: unknown flag\n".ptr, 17u64);
+			os.write(2, "w6c: unknown flag\n".ptr, 17u64);
 			return 2;
 		} else {
 			if (src_cs != nil) {
-				os.write(2, "6c: only one input\n".ptr, 19u64);
+				os.write(2, "w6c: only one input\n".ptr, 19u64);
 				return 2;
 			};
 			src_cs = a;
@@ -6728,7 +6756,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	};
 
 	if (src_cs == nil) {
-		os.write(2, "usage: 6c_ww [-o out.s] file.ww\n".ptr, 32u64);
+		os.write(2, "usage: w6c_ww [-o out.s] file.ww\n".ptr, 32u64);
 		return 2;
 	};
 
@@ -6736,7 +6764,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	let blen: u64;
 	buf, blen = slurp(src_cs);
 	if (buf == nil) {
-		os.write(2, "6c: cannot read input\n".ptr, 22u64);
+		os.write(2, "w6c: cannot read input\n".ptr, 22u64);
 		return 1;
 	};
 
@@ -6747,11 +6775,11 @@ export fn main(argc: i32, argv: **u8) i32 = {
 		let ofd: i32 = os.open(out_cs,
 		    os.O_WRONLY | os.O_CREAT | os.O_TRUNC, 420i32);	// 0o644
 		if (ofd < 0) {
-			os.write(2, "6c: cannot open output\n".ptr, 23u64);
+			os.write(2, "w6c: cannot open output\n".ptr, 23u64);
 			return 1;
 		};
 		if (os.dup2(ofd, 1i32) < 0) {
-			os.write(2, "6c: dup2 failed\n".ptr, 16u64);
+			os.write(2, "w6c: dup2 failed\n".ptr, 16u64);
 			os.close(ofd);
 			return 1;
 		};

selfhost/cmd/w6c/main.ww

@@ -1,11 +1,11 @@
-// selfhost/cmd/6c/main.ww — port of cmd/6c/main.c.
+// selfhost/cmd/w6c/main.ww — port of cmd/w6c/main.c.
 //
-// 6c = amd64 compiler. Read .ww, parse, codegen, emit Plan 9 amd64
+// w6c = amd64 compiler. Read .ww, parse, codegen, emit Plan 9 amd64
 // asm to stdout (or the file given by -o).
 //
-//   6c_ww -o file.s file.ww
+//   w6c_ww -o file.s file.ww
 //
-// The cgen routines in selfhost/cmd/wwc/cgen.ww write directly to
+// The cgen routines in selfhost/cmd/wcc/cgen.ww write directly to
 // fd 1 via os.write(1, ...). For -o, we open the output file and
 // dup2 it onto fd 1 before invoking cg_file. This is the same trick
 // the bootstrap uses with shell redirection, just in-process.
@@ -63,16 +63,16 @@ export fn main(argc: i32, argv: **u8) i32 = {
 		if (streq_cs(a, "-o")) {
 			i += 1;
 			if (i >= argc) {
-				os.write(2, "6c: -o requires arg\n".ptr, 20u64);
+				os.write(2, "w6c: -o requires arg\n".ptr, 20u64);
 				return 2;
 			};
 			out_cs = argv[i];
 		} else { if (a[0u64] == 45u8) {
-			os.write(2, "6c: unknown flag\n".ptr, 17u64);
+			os.write(2, "w6c: unknown flag\n".ptr, 17u64);
 			return 2;
 		} else {
 			if (src_cs != nil) {
-				os.write(2, "6c: only one input\n".ptr, 19u64);
+				os.write(2, "w6c: only one input\n".ptr, 19u64);
 				return 2;
 			};
 			src_cs = a;
@@ -81,7 +81,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	};
 
 	if (src_cs == nil) {
-		os.write(2, "usage: 6c_ww [-o out.s] file.ww\n".ptr, 32u64);
+		os.write(2, "usage: w6c_ww [-o out.s] file.ww\n".ptr, 32u64);
 		return 2;
 	};
 
@@ -89,7 +89,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	let blen: u64;
 	buf, blen = slurp(src_cs);
 	if (buf == nil) {
-		os.write(2, "6c: cannot read input\n".ptr, 22u64);
+		os.write(2, "w6c: cannot read input\n".ptr, 22u64);
 		return 1;
 	};
 
@@ -100,11 +100,11 @@ export fn main(argc: i32, argv: **u8) i32 = {
 		let ofd: i32 = os.open(out_cs,
 		    os.O_WRONLY | os.O_CREAT | os.O_TRUNC, 420i32);	// 0o644
 		if (ofd < 0) {
-			os.write(2, "6c: cannot open output\n".ptr, 23u64);
+			os.write(2, "w6c: cannot open output\n".ptr, 23u64);
 			return 1;
 		};
 		if (os.dup2(ofd, 1i32) < 0) {
-			os.write(2, "6c: dup2 failed\n".ptr, 16u64);
+			os.write(2, "w6c: dup2 failed\n".ptr, 16u64);
 			os.close(ofd);
 			return 1;
 		};

selfhost/cmd/w6l/dyn.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/6l/dyn.ww — port of cmd/6l/dyn.c.
+// selfhost/cmd/w6l/dyn.ww — port of cmd/w6l/dyn.c.
 //
 // Load a shared object (ET_DYN) so the linker knows which symbols it
 // exports and which DT_NEEDED entry to record. We do not pull bytes
@@ -167,11 +167,11 @@ export fn l_load_so(l: *lnk, path_cs: *u8) i32 = {
 	let blen: u64;
 	buf, blen = read_all_so(path_cs);
 	if (buf == nil) {
-		os.write(2, "6l: cannot read .so\n".ptr, 20u64);
+		os.write(2, "w6l: cannot read .so\n".ptr, 20u64);
 		return -1;
 	};
 	if (blen < 64u64) {
-		os.write(2, "6l: short ELF\n".ptr, 14u64);
+		os.write(2, "w6l: short ELF\n".ptr, 14u64);
 		return -1;
 	};
 	if (buf[0u64] != 127u8) { return so_err("not ELF"); };
@@ -359,7 +359,7 @@ export fn l_load_so(l: *lnk, path_cs: *u8) i32 = {
 };
 
 fn so_err(msg: str) i32 = {
-	os.write(2, "6l: ".ptr, 4u64);
+	os.write(2, "w6l: ".ptr, 4u64);
 	os.write(2, msg.ptr, msg.len: u64);
 	os.write(2, "\n".ptr, 1u64);
 	return -1;

selfhost/cmd/w6l/dynout.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/6l/dynout.ww — port of cmd/6l/dynout.c.
+// selfhost/cmd/w6l/dynout.ww — port of cmd/w6l/dynout.c.
 //
 // Emit a dynamic-linked ELF executable. The shape is the simplest
 // valid one: PT_INTERP + PT_DYNAMIC + DT_BIND_NOW so the loader
@@ -196,7 +196,7 @@ export fn l_emit_dyn_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	let i: i32 = 0;
 	for (i < n) {
 		if (dynsyms[i] == nil) {
-			os.write(2, "6l: dynout: no sym for plt_idx\n".ptr, 31u64);
+			os.write(2, "w6l: dynout: no sym for plt_idx\n".ptr, 31u64);
 			return 1;
 		};
 		i += 1;
@@ -621,7 +621,7 @@ export fn l_emit_dyn_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	};
 	d_wri64(dynamic_buf, dk * 16u64, DT_NULL); d_wr64(dynamic_buf, dk * 16u64 + 8u64, 0u64); dk += 1u64;
 	if (dk != ndyn) {
-		os.write(2, "6l: dynamic entry count mismatch\n".ptr, 33u64);
+		os.write(2, "w6l: dynamic entry count mismatch\n".ptr, 33u64);
 		return 1;
 	};
 
@@ -633,7 +633,7 @@ export fn l_emit_dyn_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 			if (rsym.is_dyn != 0) {
 				if (r.kind != R_X86_64_PC32_D) {
 					if (r.kind != R_X86_64_PLT32_D) {
-						os.write(2, "6l: dynamic reloc kind unsupported\n".ptr, 35u64);
+						os.write(2, "w6l: dynamic reloc kind unsupported\n".ptr, 35u64);
 						return 1;
 					};
 				};
@@ -649,7 +649,7 @@ export fn l_emit_dyn_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	// ---- assemble file buffer ----
 	let file_buf: *u8 = os.alloc(file_end): *u8;
 	if (file_buf == nil) {
-		os.write(2, "6l: out of memory\n".ptr, 18u64);
+		os.write(2, "w6l: out of memory\n".ptr, 18u64);
 		return 1;
 	};
 

selfhost/cmd/w6l/main.combined.ww

@@ -31,6 +31,8 @@ def SYS_EXECVE: i64 = 59;
 def SYS_EXIT:        i64 = 60;
 def SYS_WAIT4:       i64 = 61;
 def SYS_UNLINK:      i64 = 87;
+def SYS_GETCWD:      i64 = 79;
+def SYS_GETDENTS64:  i64 = 217;
 
 // open(2) flags. Linux values, matching <fcntl.h>.
 def O_RDONLY: i32 = 0;
@@ -65,7 +67,7 @@ export fn close(fd: i32) i32 = {
 
 // dup2(2): make `newfd` refer to the same description as `oldfd`,
 // closing `newfd` first if open. Returns `newfd` on success or a
-// negative errno. Used by 6c_ww to redirect stdout into an output
+// negative errno. Used by w6c_ww to redirect stdout into an output
 // file without changing the cgen emit path.
 export fn dup2(oldfd: i32, newfd: i32) i32 = {
 	return syscall2(SYS_DUP2, oldfd: i64, newfd: i64): i32;
@@ -179,7 +181,33 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 	    options: i64, rusage: i64): i32;
 };
 
-// selfhost/cmd/wwc/mem.ww — port of cmd/wwc/mem.c.
+// getcwd(2) — Linux flavour. Writes the NUL-terminated cwd into `buf`
+// and returns the number of bytes written (including the NUL), or a
+// negative errno. The driver uses it to expand `.` to the cwd's
+// basename for `ww build` / `ww test`.
+export fn getcwd(buf: *u8, n: u64) i64 = {
+	return syscall2(SYS_GETCWD, buf: i64, n: i64);
+};
+
+// getdents64(2) — Linux directory enumeration. The fd must be opened
+// with O_RDONLY on a directory. `buf` receives a packed sequence of
+// linux_dirent64 records:
+//
+//   struct linux_dirent64 {
+//       u64  d_ino;       // 0..7
+//       i64  d_off;       // 8..15
+//       u16  d_reclen;    // 16..17  — total bytes for this record
+//       u8   d_type;      // 18      — DT_REG/DT_DIR/...
+//       u8   d_name[];    // 19..    — NUL-terminated name + padding
+//   };
+//
+// Returns bytes written into `buf` (advance by d_reclen to walk),
+// 0 at end-of-directory, or a negative errno.
+export fn getdents64(fd: i32, buf: *u8, n: u64) i64 = {
+	return syscall3(SYS_GETDENTS64, fd: i64, buf: i64, n: i64);
+};
+
+// selfhost/cmd/wcc/mem.ww — port of cmd/wcc/mem.c.
 //
 // Bump arena allocator. Backed by the runtime page allocator
 // (rt_alloc / rt_free), no libc. Each chunk is mmap'd; when the
@@ -187,7 +215,7 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 // unmaps the chain.
 //
 // Memory handed out is 16-byte aligned. The C version under
-// cmd/wwc/ is retained until the three-stage bootstrap diffs clean.
+// cmd/wcc/ is retained until the three-stage bootstrap diffs clean.
 
 use os;
 
@@ -286,7 +314,7 @@ export fn freearena(a: *arena) void = {
 	};
 };
 
-// selfhost/cmd/6l/sym.ww — port of cmd/6l/sym.c.
+// selfhost/cmd/w6l/sym.ww — port of cmd/w6l/sym.c.
 //
 // Linker symbol table. Singly-linked list, usually a few hundred
 // entries; hashing isn't worth it yet.
@@ -388,9 +416,9 @@ export fn l_lookup(l: *lnk, name: str) *lsym = {
 	return nil;
 };
 
-// selfhost/cmd/6l/obj.ww — port of cmd/6l/obj.c.
+// selfhost/cmd/w6l/obj.ww — port of cmd/w6l/obj.c.
 //
-// Loads relocatable ELF64 .o files emitted by 6a, appends .text to
+// Loads relocatable ELF64 .o files emitted by w6a, appends .text to
 // the combined image, and pulls in symbols + relocations with
 // offsets adjusted to the combined section.
 //
@@ -410,7 +438,7 @@ def SHT_STRTAB:    i32 = 3;
 def SHT_RELA:      i32 = 4;
 
 // ---- little-endian byte readers ----------------------------------------
-// 6a/6l use straight LE on amd64. Reading via byte offsets keeps us off
+// w6a/w6l use straight LE on amd64. Reading via byte offsets keeps us off
 // the cgen's u16 field-load story for now (MOVZBQ exists; MOVZWQ doesn't).
 
 fn rd_u16(p: *u8, off: u64) u16 = {
@@ -663,7 +691,7 @@ fn member_defines_undef(l: *lnk, m: *armember) bool = {
 	return false;
 };
 
-// load_archive — port of cmd/6l/obj.c:load_archive.
+// load_archive — port of cmd/w6l/obj.c:load_archive.
 //
 // Pass 1 indexes every regular member. Pass 2 iteratively pulls in any
 // member that supplies a currently-undefined symbol; each pull may
@@ -726,7 +754,7 @@ export fn l_load(l: *lnk, path_cs: *u8) i32 = {
 	let buflen: u64;
 	bufp, buflen = read_all(path_cs);
 	if (bufp == nil) {
-		os.write(2, "6l: cannot read object\n".ptr, 23u64);
+		os.write(2, "w6l: cannot read object\n".ptr, 23u64);
 		return -1;
 	};
 	if (is_archive(bufp, buflen)) {
@@ -773,11 +801,11 @@ fn load_image(l: *lnk, path_cs: *u8, buf: *u8, len: u64) i32 = {
 		i += 1u32;
 	};
 	if (idx_text < 0) {
-		os.write(2, "6l: missing .text\n".ptr, 18u64);
+		os.write(2, "w6l: missing .text\n".ptr, 18u64);
 		return -1;
 	};
 	if (idx_symtab < 0) {
-		os.write(2, "6l: missing .symtab\n".ptr, 20u64);
+		os.write(2, "w6l: missing .symtab\n".ptr, 20u64);
 		return -1;
 	};
 
@@ -824,7 +852,7 @@ fn load_image(l: *lnk, path_cs: *u8, buf: *u8, len: u64) i32 = {
 			if (st_shndx != 0u16) {
 				if ((st_shndx: i32) == idx_text) {
 					if (gs.defined != 0) {
-						os.write(2, "6l: duplicate symbol\n".ptr, 21u64);
+						os.write(2, "w6l: duplicate symbol\n".ptr, 21u64);
 						l.errs += 1;
 					} else {
 						gs.defined = 1;
@@ -875,7 +903,7 @@ fn load_image(l: *lnk, path_cs: *u8, buf: *u8, len: u64) i32 = {
 	return 0;
 };
 
-// selfhost/cmd/6l/dyn.ww — port of cmd/6l/dyn.c.
+// selfhost/cmd/w6l/dyn.ww — port of cmd/w6l/dyn.c.
 //
 // Load a shared object (ET_DYN) so the linker knows which symbols it
 // exports and which DT_NEEDED entry to record. We do not pull bytes
@@ -1044,11 +1072,11 @@ export fn l_load_so(l: *lnk, path_cs: *u8) i32 = {
 	let blen: u64;
 	buf, blen = read_all_so(path_cs);
 	if (buf == nil) {
-		os.write(2, "6l: cannot read .so\n".ptr, 20u64);
+		os.write(2, "w6l: cannot read .so\n".ptr, 20u64);
 		return -1;
 	};
 	if (blen < 64u64) {
-		os.write(2, "6l: short ELF\n".ptr, 14u64);
+		os.write(2, "w6l: short ELF\n".ptr, 14u64);
 		return -1;
 	};
 	if (buf[0u64] != 127u8) { return so_err("not ELF"); };
@@ -1236,7 +1264,7 @@ export fn l_load_so(l: *lnk, path_cs: *u8) i32 = {
 };
 
 fn so_err(msg: str) i32 = {
-	os.write(2, "6l: ".ptr, 4u64);
+	os.write(2, "w6l: ".ptr, 4u64);
 	os.write(2, msg.ptr, msg.len: u64);
 	os.write(2, "\n".ptr, 1u64);
 	return -1;
@@ -1282,7 +1310,7 @@ fn s_eq(a: str, b: str) bool = {
 	return true;
 };
 
-// selfhost/cmd/6l/pass.ww — port of cmd/6l/pass.c.
+// selfhost/cmd/w6l/pass.ww — port of cmd/w6l/pass.c.
 //
 // Resolution + relocation. l_resolve flags every undefined symbol
 // referenced by a relocation, and promotes those provided by some
@@ -1345,7 +1373,7 @@ export fn l_resolve(l: *lnk) i32 = {
 		if (r2.sym != nil) {
 			if (r2.sym.defined == 0) {
 				if (r2.sym.is_dyn == 0) {
-					os.write(2, "6l: undefined reference to '".ptr, 28u64);
+					os.write(2, "w6l: undefined reference to '".ptr, 28u64);
 					let nm: str = r2.sym.name;
 					os.write(2, nm.ptr, nm.len: u64);
 					os.write(2, "'\n".ptr, 2u64);
@@ -1388,7 +1416,7 @@ export fn l_relocate(l: *lnk, base: u64) i32 = {
 					let rel: i64 = (target - site: i64) + r.addend;
 					patch_u32(l.text + r.off, rel: u32);
 				} else {
-					os.write(2, "6l: unsupported reloc kind\n".ptr, 27u64);
+					os.write(2, "w6l: unsupported reloc kind\n".ptr, 27u64);
 					l.errs += 1;
 				};};
 			};
@@ -1398,7 +1426,7 @@ export fn l_relocate(l: *lnk, base: u64) i32 = {
 	return l.errs;
 };
 
-// selfhost/cmd/6l/dynout.ww — port of cmd/6l/dynout.c.
+// selfhost/cmd/w6l/dynout.ww — port of cmd/w6l/dynout.c.
 //
 // Emit a dynamic-linked ELF executable. The shape is the simplest
 // valid one: PT_INTERP + PT_DYNAMIC + DT_BIND_NOW so the loader
@@ -1596,7 +1624,7 @@ export fn l_emit_dyn_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	let i: i32 = 0;
 	for (i < n) {
 		if (dynsyms[i] == nil) {
-			os.write(2, "6l: dynout: no sym for plt_idx\n".ptr, 31u64);
+			os.write(2, "w6l: dynout: no sym for plt_idx\n".ptr, 31u64);
 			return 1;
 		};
 		i += 1;
@@ -2021,7 +2049,7 @@ export fn l_emit_dyn_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	};
 	d_wri64(dynamic_buf, dk * 16u64, DT_NULL); d_wr64(dynamic_buf, dk * 16u64 + 8u64, 0u64); dk += 1u64;
 	if (dk != ndyn) {
-		os.write(2, "6l: dynamic entry count mismatch\n".ptr, 33u64);
+		os.write(2, "w6l: dynamic entry count mismatch\n".ptr, 33u64);
 		return 1;
 	};
 
@@ -2033,7 +2061,7 @@ export fn l_emit_dyn_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 			if (rsym.is_dyn != 0) {
 				if (r.kind != R_X86_64_PC32_D) {
 					if (r.kind != R_X86_64_PLT32_D) {
-						os.write(2, "6l: dynamic reloc kind unsupported\n".ptr, 35u64);
+						os.write(2, "w6l: dynamic reloc kind unsupported\n".ptr, 35u64);
 						return 1;
 					};
 				};
@@ -2049,7 +2077,7 @@ export fn l_emit_dyn_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	// ---- assemble file buffer ----
 	let file_buf: *u8 = os.alloc(file_end): *u8;
 	if (file_buf == nil) {
-		os.write(2, "6l: out of memory\n".ptr, 18u64);
+		os.write(2, "w6l: out of memory\n".ptr, 18u64);
 		return 1;
 	};
 
@@ -2142,7 +2170,7 @@ export fn l_emit_dyn_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	return 0;
 };
 
-// selfhost/cmd/6l/out.ww — port of cmd/6l/out.c.
+// selfhost/cmd/w6l/out.ww — port of cmd/w6l/out.c.
 //
 // Emit a static ELF64 executable. File layout (per the C original):
 //   [0..64)       Ehdr
@@ -2243,13 +2271,13 @@ export fn l_emit_elf(l: *lnk, fd: i32, base: u64, entry: u64) i32 = {
 	return 0;
 };
 
-// selfhost/cmd/6l/main.ww — port of cmd/6l/main.c.
+// selfhost/cmd/w6l/main.ww — port of cmd/w6l/main.c.
 //
-// 6l = amd64 linker. Reads relocatable ELF .o files, SysV `ar`
+// w6l = amd64 linker. Reads relocatable ELF .o files, SysV `ar`
 // archives, and shared objects (ET_DYN). Resolves symbols, applies
 // relocations, writes a static or dynamic-linked ELF executable.
 //
-//   6l_ww -o out [-L<dir>...] [-l<name>...] file1.o file2.o ...
+//   w6l_ww -o out [-L<dir>...] [-l<name>...] file1.o file2.o ...
 
 use os;
 use mem;
@@ -2471,14 +2499,14 @@ export fn main(argc: i32, argv: **u8) i32 = {
 		if (streq_cs(a, "-o")) {
 			i += 1;
 			if (i >= argc) {
-				os.write(2, "6l: -o requires argument\n".ptr, 25u64);
+				os.write(2, "w6l: -o requires argument\n".ptr, 25u64);
 				return 2;
 			};
 			out_path = argv[i];
 		} else { if (streq_cs(a, "-L")) {
 			i += 1;
 			if (i >= argc) {
-				os.write(2, "6l: -L requires argument\n".ptr, 25u64);
+				os.write(2, "w6l: -L requires argument\n".ptr, 25u64);
 				return 2;
 			};
 			libdirs[n_libdirs] = argv[i];
@@ -2486,7 +2514,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 		} else { if (streq_cs(a, "-l")) {
 			i += 1;
 			if (i >= argc) {
-				os.write(2, "6l: -l requires argument\n".ptr, 25u64);
+				os.write(2, "w6l: -l requires argument\n".ptr, 25u64);
 				return 2;
 			};
 			lflags[n_lflags] = argv[i];
@@ -2498,7 +2526,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 					libdirs[n_libdirs] = a + 2u64;
 					n_libdirs += 1;
 				} else {
-					os.write(2, "6l: bare -L\n".ptr, 12u64);
+					os.write(2, "w6l: bare -L\n".ptr, 12u64);
 					return 2;
 				};
 			} else { if (a[1u64] == 108u8) {
@@ -2506,16 +2534,16 @@ export fn main(argc: i32, argv: **u8) i32 = {
 					lflags[n_lflags] = a + 2u64;
 					n_lflags += 1;
 				} else {
-					os.write(2, "6l: bare -l\n".ptr, 12u64);
+					os.write(2, "w6l: bare -l\n".ptr, 12u64);
 					return 2;
 				};
 			} else {
-				os.write(2, "6l: unknown flag\n".ptr, 17u64);
+				os.write(2, "w6l: unknown flag\n".ptr, 17u64);
 				return 2;
 			};};
 		} else {
 			if (ninputs >= max_inputs) {
-				os.write(2, "6l: too many inputs\n".ptr, 20u64);
+				os.write(2, "w6l: too many inputs\n".ptr, 20u64);
 				return 2;
 			};
 			inputs[ninputs] = a;
@@ -2525,11 +2553,11 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	};
 
 	if (out_path == nil) {
-		os.write(2, "usage: 6l_ww -o exe [-L<dir>...] [-l<name>...] file1.o [file2.o...]\n".ptr, 68u64);
+		os.write(2, "usage: w6l_ww -o exe [-L<dir>...] [-l<name>...] file1.o [file2.o...]\n".ptr, 68u64);
 		return 2;
 	};
 	if (ninputs == 0) {
-		os.write(2, "6l: no inputs\n".ptr, 14u64);
+		os.write(2, "w6l: no inputs\n".ptr, 14u64);
 		return 2;
 	};
 
@@ -2554,7 +2582,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	for (lf < n_lflags) {
 		let p: *u8 = resolve_lib(a, lflags[lf], libdirs, n_libdirs);
 		if (p == nil) {
-			os.write(2, "6l: cannot find -l".ptr, 18u64);
+			os.write(2, "w6l: cannot find -l".ptr, 18u64);
 			let nm: *u8 = lflags[lf];
 			os.write(2, nm, cstrlen_l(nm));
 			os.write(2, "\n".ptr, 1u64);
@@ -2575,18 +2603,18 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	if (entry_sym == nil) { entry_sym = l_lookup(l, "main"); }
 	else { if (entry_sym.defined == 0) { entry_sym = l_lookup(l, "main"); }; };
 	if (entry_sym == nil) {
-		os.write(2, "6l: no _start or main symbol\n".ptr, 29u64);
+		os.write(2, "w6l: no _start or main symbol\n".ptr, 29u64);
 		return 1;
 	};
 	if (entry_sym.defined == 0) {
-		os.write(2, "6l: no _start or main symbol\n".ptr, 29u64);
+		os.write(2, "w6l: no _start or main symbol\n".ptr, 29u64);
 		return 1;
 	};
 
 	let flags: i32 = os.O_WRONLY | os.O_CREAT | os.O_TRUNC;
 	let fd: i32 = os.open(out_path, flags, 493i32);	// 0o755
 	if (fd < 0) {
-		os.write(2, "6l: cannot open output\n".ptr, 23u64);
+		os.write(2, "w6l: cannot open output\n".ptr, 23u64);
 		return 1;
 	};
 

selfhost/cmd/w6l/main.ww

@@ -1,10 +1,10 @@
-// selfhost/cmd/6l/main.ww — port of cmd/6l/main.c.
+// selfhost/cmd/w6l/main.ww — port of cmd/w6l/main.c.
 //
-// 6l = amd64 linker. Reads relocatable ELF .o files, SysV `ar`
+// w6l = amd64 linker. Reads relocatable ELF .o files, SysV `ar`
 // archives, and shared objects (ET_DYN). Resolves symbols, applies
 // relocations, writes a static or dynamic-linked ELF executable.
 //
-//   6l_ww -o out [-L<dir>...] [-l<name>...] file1.o file2.o ...
+//   w6l_ww -o out [-L<dir>...] [-l<name>...] file1.o file2.o ...
 
 use os;
 use mem;
@@ -226,14 +226,14 @@ export fn main(argc: i32, argv: **u8) i32 = {
 		if (streq_cs(a, "-o")) {
 			i += 1;
 			if (i >= argc) {
-				os.write(2, "6l: -o requires argument\n".ptr, 25u64);
+				os.write(2, "w6l: -o requires argument\n".ptr, 25u64);
 				return 2;
 			};
 			out_path = argv[i];
 		} else { if (streq_cs(a, "-L")) {
 			i += 1;
 			if (i >= argc) {
-				os.write(2, "6l: -L requires argument\n".ptr, 25u64);
+				os.write(2, "w6l: -L requires argument\n".ptr, 25u64);
 				return 2;
 			};
 			libdirs[n_libdirs] = argv[i];
@@ -241,7 +241,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 		} else { if (streq_cs(a, "-l")) {
 			i += 1;
 			if (i >= argc) {
-				os.write(2, "6l: -l requires argument\n".ptr, 25u64);
+				os.write(2, "w6l: -l requires argument\n".ptr, 25u64);
 				return 2;
 			};
 			lflags[n_lflags] = argv[i];
@@ -253,7 +253,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 					libdirs[n_libdirs] = a + 2u64;
 					n_libdirs += 1;
 				} else {
-					os.write(2, "6l: bare -L\n".ptr, 12u64);
+					os.write(2, "w6l: bare -L\n".ptr, 12u64);
 					return 2;
 				};
 			} else { if (a[1u64] == 108u8) {
@@ -261,16 +261,16 @@ export fn main(argc: i32, argv: **u8) i32 = {
 					lflags[n_lflags] = a + 2u64;
 					n_lflags += 1;
 				} else {
-					os.write(2, "6l: bare -l\n".ptr, 12u64);
+					os.write(2, "w6l: bare -l\n".ptr, 12u64);
 					return 2;
 				};
 			} else {
-				os.write(2, "6l: unknown flag\n".ptr, 17u64);
+				os.write(2, "w6l: unknown flag\n".ptr, 17u64);
 				return 2;
 			};};
 		} else {
 			if (ninputs >= max_inputs) {
-				os.write(2, "6l: too many inputs\n".ptr, 20u64);
+				os.write(2, "w6l: too many inputs\n".ptr, 20u64);
 				return 2;
 			};
 			inputs[ninputs] = a;
@@ -280,11 +280,11 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	};
 
 	if (out_path == nil) {
-		os.write(2, "usage: 6l_ww -o exe [-L<dir>...] [-l<name>...] file1.o [file2.o...]\n".ptr, 68u64);
+		os.write(2, "usage: w6l_ww -o exe [-L<dir>...] [-l<name>...] file1.o [file2.o...]\n".ptr, 68u64);
 		return 2;
 	};
 	if (ninputs == 0) {
-		os.write(2, "6l: no inputs\n".ptr, 14u64);
+		os.write(2, "w6l: no inputs\n".ptr, 14u64);
 		return 2;
 	};
 
@@ -309,7 +309,7 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	for (lf < n_lflags) {
 		let p: *u8 = resolve_lib(a, lflags[lf], libdirs, n_libdirs);
 		if (p == nil) {
-			os.write(2, "6l: cannot find -l".ptr, 18u64);
+			os.write(2, "w6l: cannot find -l".ptr, 18u64);
 			let nm: *u8 = lflags[lf];
 			os.write(2, nm, cstrlen_l(nm));
 			os.write(2, "\n".ptr, 1u64);
@@ -330,18 +330,18 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	if (entry_sym == nil) { entry_sym = l_lookup(l, "main"); }
 	else { if (entry_sym.defined == 0) { entry_sym = l_lookup(l, "main"); }; };
 	if (entry_sym == nil) {
-		os.write(2, "6l: no _start or main symbol\n".ptr, 29u64);
+		os.write(2, "w6l: no _start or main symbol\n".ptr, 29u64);
 		return 1;
 	};
 	if (entry_sym.defined == 0) {
-		os.write(2, "6l: no _start or main symbol\n".ptr, 29u64);
+		os.write(2, "w6l: no _start or main symbol\n".ptr, 29u64);
 		return 1;
 	};
 
 	let flags: i32 = os.O_WRONLY | os.O_CREAT | os.O_TRUNC;
 	let fd: i32 = os.open(out_path, flags, 493i32);	// 0o755
 	if (fd < 0) {
-		os.write(2, "6l: cannot open output\n".ptr, 23u64);
+		os.write(2, "w6l: cannot open output\n".ptr, 23u64);
 		return 1;
 	};
 

selfhost/cmd/w6l/obj.ww

@@ -1,6 +1,6 @@
-// selfhost/cmd/6l/obj.ww — port of cmd/6l/obj.c.
+// selfhost/cmd/w6l/obj.ww — port of cmd/w6l/obj.c.
 //
-// Loads relocatable ELF64 .o files emitted by 6a, appends .text to
+// Loads relocatable ELF64 .o files emitted by w6a, appends .text to
 // the combined image, and pulls in symbols + relocations with
 // offsets adjusted to the combined section.
 //
@@ -20,7 +20,7 @@ def SHT_STRTAB:    i32 = 3;
 def SHT_RELA:      i32 = 4;
 
 // ---- little-endian byte readers ----------------------------------------
-// 6a/6l use straight LE on amd64. Reading via byte offsets keeps us off
+// w6a/w6l use straight LE on amd64. Reading via byte offsets keeps us off
 // the cgen's u16 field-load story for now (MOVZBQ exists; MOVZWQ doesn't).
 
 fn rd_u16(p: *u8, off: u64) u16 = {
@@ -273,7 +273,7 @@ fn member_defines_undef(l: *lnk, m: *armember) bool = {
 	return false;
 };
 
-// load_archive — port of cmd/6l/obj.c:load_archive.
+// load_archive — port of cmd/w6l/obj.c:load_archive.
 //
 // Pass 1 indexes every regular member. Pass 2 iteratively pulls in any
 // member that supplies a currently-undefined symbol; each pull may
@@ -336,7 +336,7 @@ export fn l_load(l: *lnk, path_cs: *u8) i32 = {
 	let buflen: u64;
 	bufp, buflen = read_all(path_cs);
 	if (bufp == nil) {
-		os.write(2, "6l: cannot read object\n".ptr, 23u64);
+		os.write(2, "w6l: cannot read object\n".ptr, 23u64);
 		return -1;
 	};
 	if (is_archive(bufp, buflen)) {
@@ -383,11 +383,11 @@ fn load_image(l: *lnk, path_cs: *u8, buf: *u8, len: u64) i32 = {
 		i += 1u32;
 	};
 	if (idx_text < 0) {
-		os.write(2, "6l: missing .text\n".ptr, 18u64);
+		os.write(2, "w6l: missing .text\n".ptr, 18u64);
 		return -1;
 	};
 	if (idx_symtab < 0) {
-		os.write(2, "6l: missing .symtab\n".ptr, 20u64);
+		os.write(2, "w6l: missing .symtab\n".ptr, 20u64);
 		return -1;
 	};
 
@@ -434,7 +434,7 @@ fn load_image(l: *lnk, path_cs: *u8, buf: *u8, len: u64) i32 = {
 			if (st_shndx != 0u16) {
 				if ((st_shndx: i32) == idx_text) {
 					if (gs.defined != 0) {
-						os.write(2, "6l: duplicate symbol\n".ptr, 21u64);
+						os.write(2, "w6l: duplicate symbol\n".ptr, 21u64);
 						l.errs += 1;
 					} else {
 						gs.defined = 1;

selfhost/cmd/w6l/out.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/6l/out.ww — port of cmd/6l/out.c.
+// selfhost/cmd/w6l/out.ww — port of cmd/w6l/out.c.
 //
 // Emit a static ELF64 executable. File layout (per the C original):
 //   [0..64)       Ehdr

selfhost/cmd/w6l/pass.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/6l/pass.ww — port of cmd/6l/pass.c.
+// selfhost/cmd/w6l/pass.ww — port of cmd/w6l/pass.c.
 //
 // Resolution + relocation. l_resolve flags every undefined symbol
 // referenced by a relocation, and promotes those provided by some
@@ -61,7 +61,7 @@ export fn l_resolve(l: *lnk) i32 = {
 		if (r2.sym != nil) {
 			if (r2.sym.defined == 0) {
 				if (r2.sym.is_dyn == 0) {
-					os.write(2, "6l: undefined reference to '".ptr, 28u64);
+					os.write(2, "w6l: undefined reference to '".ptr, 28u64);
 					let nm: str = r2.sym.name;
 					os.write(2, nm.ptr, nm.len: u64);
 					os.write(2, "'\n".ptr, 2u64);
@@ -104,7 +104,7 @@ export fn l_relocate(l: *lnk, base: u64) i32 = {
 					let rel: i64 = (target - site: i64) + r.addend;
 					patch_u32(l.text + r.off, rel: u32);
 				} else {
-					os.write(2, "6l: unsupported reloc kind\n".ptr, 27u64);
+					os.write(2, "w6l: unsupported reloc kind\n".ptr, 27u64);
 					l.errs += 1;
 				};};
 			};

selfhost/cmd/w6l/sym.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/6l/sym.ww — port of cmd/6l/sym.c.
+// selfhost/cmd/w6l/sym.ww — port of cmd/w6l/sym.c.
 //
 // Linker symbol table. Singly-linked list, usually a few hundred
 // entries; hashing isn't worth it yet.

selfhost/cmd/wcc/ast.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/wwc/ast.ww — port of cmd/wwc/ast.c (Node defs + printer).
+// selfhost/cmd/wcc/ast.ww — port of cmd/wcc/ast.c (Node defs + printer).
 //
 // Status: AST printer is fully ported. Constructor `newnode` is here.
 // The parser (parse.ww) is currently minimal — see its file header.
@@ -14,7 +14,7 @@ use tok;
 
 // ---- Nkind ------------------------------------------------------------
 //
-// Mirror of cmd/wwc/ww.h Nkind. Values must stay numerically equal so
+// Mirror of cmd/wcc/ww.h Nkind. Values must stay numerically equal so
 // the AST diff probe in 990_selfhost works.
 
 def N_NONE:     i32 = 0;

selfhost/cmd/wcc/cgen.ww

@@ -1,7 +1,7 @@
-// selfhost/cmd/wwc/cgen.ww — port of cmd/6c/cgen.c.
+// selfhost/cmd/wcc/cgen.ww — port of cmd/w6c/cgen.c.
 //
 // Status: GROWING. Each subsystem we add is verified by `wwdump_ww -c`
-// producing byte-identical output to C-side `6c` for the same source,
+// producing byte-identical output to C-side `w6c` for the same source,
 // then by assembling + linking + running the result.
 //
 // Current coverage:
@@ -196,7 +196,7 @@ fn local_alloc(c: *cgen, name: str, sz: i32, tnode: *node) i32 = {
 fn local_add(c: *cgen, name: str, sz: i32, tnode: *node) i32 = {
 	// Name-based slot reuse for N_LETs and params: if `name` is
 	// already declared in this function, return its existing
-	// offset. Mirrors C cgen (cmd/6c/cgen.c:localoff). Two
+	// offset. Mirrors C cgen (cmd/w6c/cgen.c:localoff). Two
 	// disjoint scopes that declare the same name share one slot —
 	// so `escape` in wwdump (three `let cp: pos;` across separate
 	// branches) reserves one slot, not three. scan_locals does
@@ -533,7 +533,7 @@ fn fnret_lookup(c: *cgen, name: str) *node = {
 
 // ---- def-constant registry ------------------------------------------
 //
-// `def NAME: T = LIT;` becomes a DATA symbol the C-side 6c emits; an
+// `def NAME: T = LIT;` becomes a DATA symbol the C-side w6c emits; an
 // ident reference loads it via `MOVQ NAME(SB), AX`. We collect them at
 // file load and consult on N_IDENT lookup.
 
@@ -1161,7 +1161,7 @@ fn node_isunsigned(c: *cgen, n: *node) bool = {
 	// Walks the base local's declared type and pulls the element
 	// out — *u8 → u8, [N]u32 → u32, []u64 → u64. Without this the
 	// compare-codegen for `p[i] >= 48u8` falls back to signed JGE
-	// instead of JAE, diverging from C 6c on byte indexing.
+	// instead of JAE, diverging from C w6c on byte indexing.
 	if (k == N_INDEX) {
 		let base: *node = n.lhs;
 		if (base != nil) {
@@ -1634,7 +1634,7 @@ fn cgexpr(c: *cgen, n: *node) void = {
 		// path the cgen falls through and AX retains whatever the
 		// inner expression left there — typically the *struct pointer
 		// itself, so reads silently get the pointer value instead of
-		// the field. (Showed up porting 6l/pass.ww.)
+		// the field. (Showed up porting w6l/pass.ww.)
 		if (lhs != nil) {
 			if (lhs.kind == N_DOT) {
 				let inner_t: *node = dot_inner_struct_ptr(c, lhs);
@@ -1923,7 +1923,7 @@ fn cgexpr(c: *cgen, n: *node) void = {
 						};
 						cgexpr(c, n.rhs);
 						// Push order matches C cgen
-						// (cmd/6c/cgen.c:1033-1041): PUSHQ AX
+						// (cmd/w6c/cgen.c:1033-1041): PUSHQ AX
 						// (ptr) first, then PUSHQ BX (len) if
 						// str, so the pop sequence is POP CX
 						// (len) → POP AX (ptr) → MOVQ AX,
@@ -2695,7 +2695,7 @@ fn cgstmt(c: *cgen, n: *node) void = {
 			};
 		} else {
 			// Bare `let x: T;` with no initializer. C cgen
-			// (cmd/6c/cgen.c:2181-2183) zero-inits only when
+			// (cmd/w6c/cgen.c:2181-2183) zero-inits only when
 			// the underlying type's natural size is 8 — pointers,
 			// i64/u64, function pointers, ints. Structs/arrays/
 			// slices/strings/tagged/tuples are left for per-field
@@ -2766,7 +2766,7 @@ fn cgstmt(c: *cgen, n: *node) void = {
 	// Tuple-destructure assign: `a, b = call();`. The call's tuple
 	// return lands in (AX, DX); push DX to free it, store AX into
 	// the first lvalue, then pop DX into the second. Mirrors
-	// cmd/6c/cgen.c:2424-2440. Lvalues beyond two are dropped (same
+	// cmd/w6c/cgen.c:2424-2440. Lvalues beyond two are dropped (same
 	// as C — no fixture uses >2 today).
 	if (k == N_MASSIGN) {
 		if (n.rhs != nil) { cgexpr(c, n.rhs); };

selfhost/cmd/wcc/check.ww

@@ -1,8 +1,8 @@
-// selfhost/cmd/wwc/check.ww — minimal port of cmd/wwc/check.c.
+// selfhost/cmd/wcc/check.ww — minimal port of cmd/wcc/check.c.
 //
 // Status: name-resolution + primitive-type seeding only. Full type
 // inference, conversion rules, tagged-union dispatch typing, return-
-// type checking, etc. all live in cmd/wwc/check.c (937 lines) and
+// type checking, etc. all live in cmd/wcc/check.c (937 lines) and
 // will land here in subsequent commits.
 //
 // What this version does:

selfhost/cmd/wcc/err.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/wwc/err.ww — port of cmd/wwc/err.c.
+// selfhost/cmd/wcc/err.ww — port of cmd/wcc/err.c.
 //
 // Diagnostics. Plan 9 style: short, no levels beyond fatal/error/warn.
 // Output goes through os.write so we don't pull in libc stdio.

selfhost/cmd/wcc/lex.ww

@@ -1,11 +1,11 @@
-// selfhost/cmd/wwc/lex.ww — port of cmd/wwc/lex.c.
+// selfhost/cmd/wcc/lex.ww — port of cmd/wcc/lex.c.
 //
 // The DFA, the helpers, and the order of decisions all mirror the C
 // version exactly. The 990_selfhost test diffs the resulting token
 // stream against the C-side wwdump byte-for-byte; any divergence is
 // a port bug.
 //
-// Calling-convention note: 6c can't yet pass or return structs >16
+// Calling-convention note: w6c can't yet pass or return structs >16
 // bytes by value, so `tok` and `pos` are passed by pointer (out
 // params). The C version passes `Tok` by value; we differ here only
 // in shape, not in observable behaviour. Token kind values stay

selfhost/cmd/wcc/mem.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/wwc/mem.ww — port of cmd/wwc/mem.c.
+// selfhost/cmd/wcc/mem.ww — port of cmd/wcc/mem.c.
 //
 // Bump arena allocator. Backed by the runtime page allocator
 // (rt_alloc / rt_free), no libc. Each chunk is mmap'd; when the
@@ -6,7 +6,7 @@
 // unmaps the chain.
 //
 // Memory handed out is 16-byte aligned. The C version under
-// cmd/wwc/ is retained until the three-stage bootstrap diffs clean.
+// cmd/wcc/ is retained until the three-stage bootstrap diffs clean.
 
 use os;
 

selfhost/cmd/wcc/parse.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/wwc/parse.ww — port of cmd/wwc/parse.c.
+// selfhost/cmd/wcc/parse.ww — port of cmd/wcc/parse.c.
 //
 // Status: GROWING stub. Currently handles top-level `use IDENT;`,
 // `def NAME: TYPE = LIT;`, `type NAME = TYPE;`, and `fn NAME(params)
@@ -11,7 +11,7 @@
 // surface form lands here gradually so the AST diff in 990_selfhost
 // grows toward whole-language coverage one increment at a time.
 //
-// Calling-convention shim: 6c can't yet pass a sub-struct field
+// Calling-convention shim: w6c can't yet pass a sub-struct field
 // (e.g. p.cur.line where p.cur is a `tok` of size 76). The parser
 // stores the current token as flat primitive fields rather than a
 // nested `tok` struct; `refill` copies a freshly lexed token in.
@@ -746,7 +746,7 @@ fn parsestmt(p: *parser) *node = {
 	};
 	// expression statement, or tuple-destructure multi-assign:
 	//   a, b = expr;
-	// Mirrors cmd/wwc/parse.c:1015-1031. We parse the first lvalue
+	// Mirrors cmd/wcc/parse.c:1015-1031. We parse the first lvalue
 	// with parseexpr (matches the C side); subsequent lvalues go
 	// through parsebin(parseunary, 1) so the `=` stays for us to
 	// consume — parseexpr would absorb it.

selfhost/cmd/wcc/sym.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/wwc/sym.ww — port of cmd/wwc/sym.c.
+// selfhost/cmd/wcc/sym.ww — port of cmd/wcc/sym.c.
 //
 // Per-scope hashtable, chained to the parent. Lookup walks up.
 // Plan 9 / Hare flavoured. Duplicate definitions in the same scope
@@ -8,7 +8,7 @@ use mem;
 use typ;
 use ast;
 
-// Symbol kinds — must stay numerically aligned with cmd/wwc/ww.h Skind.
+// Symbol kinds — must stay numerically aligned with cmd/wcc/ww.h Skind.
 def SK_NONE:  i32 = 0;
 def SK_VAR:   i32 = 1;
 def SK_PARAM: i32 = 2;

selfhost/cmd/wcc/tok.ww

@@ -1,5 +1,5 @@
-// selfhost/cmd/wwc/tok.ww — port of cmd/wwc/tok.c plus the Tkind /
+// selfhost/cmd/wcc/tok.ww — port of cmd/wcc/tok.c plus the Tkind /
-// Tok / Pos shapes from cmd/wwc/ww.h.
+// Tok / Pos shapes from cmd/wcc/ww.h.
 //
 // Token kind values must stay numerically equal to the C side: the
 // 990_selfhost test diffs ww-side wwdump output against C-side
@@ -7,13 +7,13 @@
 // integers and breaks the diff.
 //
 // Bottom of file: tokprint, which emits one token per line in a
-// format identical to cmd/wwc/tok.c:tokprint().
+// format identical to cmd/wcc/tok.c:tokprint().
 
 use os;
 use strconv;
 
 // ---- Tkind ------------------------------------------------------------
-// Mirror of the C enum in cmd/wwc/ww.h. Don't reorder.
+// Mirror of the C enum in cmd/wcc/ww.h. Don't reorder.
 
 def TK_NONE:     i32 = 0;
 def TK_EOF:      i32 = 1;
@@ -108,7 +108,7 @@ def TK_LAST: i32 = 80;
 // ---- Pos / Tok --------------------------------------------------------
 //
 // `pos` is used at error-reporting boundaries; we always pass it via
-// *pos so the value never gets struct-copied (6c can't yet copy a
+// *pos so the value never gets struct-copied (w6c can't yet copy a
 // 24-byte struct).
 //
 // `tok` is flat — file/line/col live directly on the token rather than
@@ -146,7 +146,7 @@ fn streq_n(a: *u8, b: str, n: i32) bool = {
 
 // kwlookup — returns the matching TK_* keyword kind for a byte run,
 // or TK_NONE if it's an ordinary identifier. Linear search over a
-// small alphabetised list, matching cmd/wwc/tok.c.
+// small alphabetised list, matching cmd/wcc/tok.c.
 export fn kwlookup(p: *u8, n: i32) i32 = {
 	if (streq_n(p, "as", n))       { return TK_AS; };
 	if (streq_n(p, "break", n))    { return TK_BREAK; };
@@ -275,7 +275,7 @@ export fn tokname(k: i32) str = {
 
 // ---- writer for tokprint ----------------------------------------------
 //
-// fputq mirrors cmd/wwc/tok.c:fputq — quote the string with C-style
+// fputq mirrors cmd/wcc/tok.c:fputq — quote the string with C-style
 // escapes for \, ", \n, \t, \r and \xNN for other non-printables.
 
 fn fputc_byte(fd: i32, b: u8) void = {
@@ -342,14 +342,14 @@ fn fputq(fd: i32, p: *u8, n: i32) void = {
 };
 
 // tokprint — write one token line to fd. Format must match
-// cmd/wwc/tok.c:tokprint() byte-for-byte: that's the diff anchor.
+// cmd/wcc/tok.c:tokprint() byte-for-byte: that's the diff anchor.
 //   "<file>:<line>:<col> <kindname>[ <value>]\n"
 //
-// Takes `t` by pointer because 6c can't yet pass a >16-byte struct
+// Takes `t` by pointer because w6c can't yet pass a >16-byte struct
 // by value; the C version takes Tok by value.
 export fn tokprint(fd: i32, t: *tok) void = {
 	// Chained-dot field reads (`t.x.y`) on str sub-fields aren't yet
-	// reduced by 6c — `t.x.y` returns the whole str. Lift the str
+	// reduced by w6c — `t.x.y` returns the whole str. Lift the str
 	// fields into locals so we can use the str pseudo-field path.
 	let tfile: str = t.file;
 	let ttext: str = t.text;

selfhost/cmd/wcc/typ.ww

@@ -1,4 +1,4 @@
-// selfhost/cmd/wwc/type.ww — port of cmd/wwc/type.c.
+// selfhost/cmd/wcc/type.ww — port of cmd/wcc/type.c.
 //
 // Status: full structural port. The C version uses module-globals for
 // the primitive types (ty_void, ty_i32, …); ww doesn't have writable
@@ -10,7 +10,7 @@ use os;
 use mem;
 
 // ---- TypeKind ---------------------------------------------------------
-// Numeric values must stay aligned with cmd/wwc/ww.h TypeKind so the
+// Numeric values must stay aligned with cmd/wcc/ww.h TypeKind so the
 // next diff signal (typed-AST printer / cgen) can compare across the
 // two implementations.
 

selfhost/cmd/ww/main.combined.ww

@@ -31,6 +31,8 @@ def SYS_EXECVE: i64 = 59;
 def SYS_EXIT:        i64 = 60;
 def SYS_WAIT4:       i64 = 61;
 def SYS_UNLINK:      i64 = 87;
+def SYS_GETCWD:      i64 = 79;
+def SYS_GETDENTS64:  i64 = 217;
 
 // open(2) flags. Linux values, matching <fcntl.h>.
 def O_RDONLY: i32 = 0;
@@ -65,7 +67,7 @@ export fn close(fd: i32) i32 = {
 
 // dup2(2): make `newfd` refer to the same description as `oldfd`,
 // closing `newfd` first if open. Returns `newfd` on success or a
-// negative errno. Used by 6c_ww to redirect stdout into an output
+// negative errno. Used by w6c_ww to redirect stdout into an output
 // file without changing the cgen emit path.
 export fn dup2(oldfd: i32, newfd: i32) i32 = {
 	return syscall2(SYS_DUP2, oldfd: i64, newfd: i64): i32;
@@ -179,7 +181,33 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 	    options: i64, rusage: i64): i32;
 };
 
-// selfhost/cmd/wwc/mem.ww — port of cmd/wwc/mem.c.
+// getcwd(2) — Linux flavour. Writes the NUL-terminated cwd into `buf`
+// and returns the number of bytes written (including the NUL), or a
+// negative errno. The driver uses it to expand `.` to the cwd's
+// basename for `ww build` / `ww test`.
+export fn getcwd(buf: *u8, n: u64) i64 = {
+	return syscall2(SYS_GETCWD, buf: i64, n: i64);
+};
+
+// getdents64(2) — Linux directory enumeration. The fd must be opened
+// with O_RDONLY on a directory. `buf` receives a packed sequence of
+// linux_dirent64 records:
+//
+//   struct linux_dirent64 {
+//       u64  d_ino;       // 0..7
+//       i64  d_off;       // 8..15
+//       u16  d_reclen;    // 16..17  — total bytes for this record
+//       u8   d_type;      // 18      — DT_REG/DT_DIR/...
+//       u8   d_name[];    // 19..    — NUL-terminated name + padding
+//   };
+//
+// Returns bytes written into `buf` (advance by d_reclen to walk),
+// 0 at end-of-directory, or a negative errno.
+export fn getdents64(fd: i32, buf: *u8, n: u64) i64 = {
+	return syscall3(SYS_GETDENTS64, fd: i64, buf: i64, n: i64);
+};
+
+// selfhost/cmd/wcc/mem.ww — port of cmd/wcc/mem.c.
 //
 // Bump arena allocator. Backed by the runtime page allocator
 // (rt_alloc / rt_free), no libc. Each chunk is mmap'd; when the
@@ -187,7 +215,7 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 // unmaps the chain.
 //
 // Memory handed out is 16-byte aligned. The C version under
-// cmd/wwc/ is retained until the three-stage bootstrap diffs clean.
+// cmd/wcc/ is retained until the three-stage bootstrap diffs clean.
 
 use os;
 
@@ -290,13 +318,13 @@ export fn freearena(a: *arena) void = {
 //
 // The user-facing driver. Plan 9 cc(1) / Hare hare(1) analogue:
 //
-//   ww build foo.ww  →  6c foo.ww > foo.s ; 6a foo.s > foo.o ;
+//   ww build foo.ww  →  w6c foo.ww > foo.s ; w6a foo.s > foo.o ;
-//                       6l -o foo foo.o libwwrt.a
+//                       w6l -o foo foo.o libwwrt.a
 //   ww run   foo.ww  →  build then exec
 //   ww version       →  print version
 //
 // Tool paths default to siblings of $0 so a fresh build runs out of
-// out/bin/. Env-var overrides (WW_6C / WW_6A / WW_6L / WW_LIB) are
+// out/bin/. Env-var overrides (WW_W6C / WW_W6A / WW_W6L / WW_LIB) are
 // not yet supported in this port; the bootstrap doesn't need them.
 
 use os;
@@ -696,7 +724,7 @@ fn append_lit(stem: *u8, suffix: str) *u8 = {
 };
 
 // linker flags bundled as a struct so build_one stays at the wwstage
-// 6c's 6-argument calling-convention limit.
+// w6c's 6-argument calling-convention limit.
 type lflags = struct {
 	libdirs:   **u8,
 	n_libdirs: i32,
@@ -706,7 +734,7 @@ type lflags = struct {
 
 // build_one — compile `src` into the executable named `out`.
 //   self_dir:  NUL-terminated dir containing this driver and the
-//              wwstage tools (6c_ww/6a_ww/6l_ww)
+//              wwstage tools (w6c_ww/w6a_ww/w6l_ww)
 //   src:       NUL-terminated path to the .ww file
 //   out:       NUL-terminated desired output path
 //   incs:      NUL-terminated colon-list of -I dirs (may be empty)
@@ -714,14 +742,14 @@ type lflags = struct {
 //
 // The ww-side driver shells to the ww-side tools so a `ww_ww build`
 // touches no C-built code at runtime. The C `ww` driver in cmd/ww/
-// still drives the C-built 6c/6a/6l. Test 993 pins the two
+// still drives the C-built w6c/w6a/w6l. Test 993 pins the two
 // pipelines to byte-identical output on a corpus.
 fn build_one(self_dir: *u8, src: *u8, out: *u8, incs: *u8, lf: *lflags) i32 = {
 	let a: *arena = newarena();
 
-	let c6: *u8 = join_path_lit(self_dir, "6c_ww");
+	let c6: *u8 = join_path_lit(self_dir, "w6c_ww");
-	let a6: *u8 = join_path_lit(self_dir, "6a_ww");
+	let a6: *u8 = join_path_lit(self_dir, "w6a_ww");
-	let l6: *u8 = join_path_lit(self_dir, "6l_ww");
+	let l6: *u8 = join_path_lit(self_dir, "w6l_ww");
 
 	// Default lib search path: <self_dir>/../../lib
 	let dotdot_lib: *u8 = os.alloc(PATH_MAX): *u8;
@@ -774,35 +802,35 @@ fn build_one(self_dir: *u8, src: *u8, out: *u8, incs: *u8, lf: *lflags) i32 = {
 	};
 	os.close(cf);
 
-	// Step 2: 6c -o <stem>.s <stem>.combined.ww
+	// Step 2: w6c -o <stem>.s <stem>.combined.ww
 	{
 		let argv: **u8 = os.alloc(40u64): **u8;
-		argv[0] = "6c\0".ptr;
+		argv[0] = "w6c\0".ptr;
 		argv[1] = "-o\0".ptr;
 		argv[2] = asmf;
 		argv[3] = combined;
 		argv[4] = nil;
 		if (proc_run(c6, argv) != 0) {
-			os.write(2, "ww: 6c failed\n".ptr, 14u64);
+			os.write(2, "ww: w6c failed\n".ptr, 15u64);
 			return 1;
 		};
 	};
 
-	// Step 3: 6a -o <stem>.o <stem>.s
+	// Step 3: w6a -o <stem>.o <stem>.s
 	{
 		let argv: **u8 = os.alloc(40u64): **u8;
-		argv[0] = "6a\0".ptr;
+		argv[0] = "w6a\0".ptr;
 		argv[1] = "-o\0".ptr;
 		argv[2] = objf;
 		argv[3] = asmf;
 		argv[4] = nil;
 		if (proc_run(a6, argv) != 0) {
-			os.write(2, "ww: 6a failed\n".ptr, 14u64);
+			os.write(2, "ww: w6a failed\n".ptr, 15u64);
 			return 1;
 		};
 	};
 
-	// Step 4: 6l -o <out> <stem>.o libwwrt.a [-L<dir>...] [-l<name>...]
+	// Step 4: w6l -o <out> <stem>.o libwwrt.a [-L<dir>...] [-l<name>...]
 	{
 		let nl_dirs: i32 = 0;
 		let nl_libs: i32 = 0;
@@ -814,13 +842,13 @@ fn build_one(self_dir: *u8, src: *u8, out: *u8, incs: *u8, lf: *lflags) i32 = {
 			l_dirs  = lf.libdirs;
 			l_libs  = lf.libs;
 		};
-		// argv slots: 5 fixed (6l, -o, out, objf, libwwrt)
+		// argv slots: 5 fixed (w6l, -o, out, objf, libwwrt)
 		//           + 2 * n_libdirs (-L, dir)
 		//           + 2 * n_libs    (-l, name)
 		//           + 1 nil terminator.
 		let total: i32 = 5 + 2 * nl_dirs + 2 * nl_libs + 1;
 		let argv: **u8 = os.alloc((total: u64) * 8u64): **u8;
-		argv[0] = "6l\0".ptr;
+		argv[0] = "w6l\0".ptr;
 		argv[1] = "-o\0".ptr;
 		argv[2] = out;
 		argv[3] = objf;
@@ -842,17 +870,139 @@ fn build_one(self_dir: *u8, src: *u8, out: *u8, incs: *u8, lf: *lflags) i32 = {
 		};
 		argv[pos] = nil;
 		if (proc_run(l6, argv) != 0) {
-			os.write(2, "ww: 6l failed\n".ptr, 14u64);
+			os.write(2, "ww: w6l failed\n".ptr, 15u64);
 			return 1;
 		};
 	};
 	return 0;
 };
 
+// ---- Module-by-name resolution ----------------------------------------
+//
+// Mirrors cmd/ww/main.c:resolve_module. Maps a name like "foo", "lib/foo",
+// "foo.ww", or "." to a concrete .ww file path:
+//   1. literal <name>.ww that exists                → use as-is
+//   2. "."  → <cwd>/<basename(cwd)>.ww              → that, if it exists
+//   3. <name>/<basename(name)>.ww                   → that, if it exists
+//   4. walk search path (cwd:incs:<self_dir>/../../lib):
+//        <dir>/<name>.ww  or  <dir>/<name>/<name>.ww
+
+fn cstr_endswith_lit(p: *u8, lit: str) bool = {
+	let plen: u64 = cstrlen(p);
+	let slen: u64 = lit.len: u64;
+	if (plen < slen) { return false; };
+	let off: u64 = plen - slen;
+	let i: i32 = 0;
+	for (i < lit.len) {
+		let iu: u64 = i: u64;
+		if (p[off + iu] != lit[i]) { return false; };
+		i += 1;
+	};
+	return true;
+};
+
+// basename_off — return the offset of the last path segment within `p`
+// (i.e. one past the final '/'). Returns 0 if there's no slash.
+fn basename_off(p: *u8, plen: u64) u64 = {
+	let start: u64 = 0u64;
+	let i: u64 = 0u64;
+	for (i < plen) {
+		if (p[i] == 47u8) { start = i + 1u64; };	// '/'
+		i += 1u64;
+	};
+	return start;
+};
+
+// arena_dup_cstr — copy `plen` bytes from `src` into a fresh NUL-sealed
+// arena buffer.
+fn arena_dup_cstr(a: *arena, src: *u8, plen: u64) *u8 = {
+	let buf: *u8 = amalloc(a, plen + 1u64): *u8;
+	let i: u64 = 0u64;
+	for (i < plen) { buf[i] = src[i]; i += 1u64; };
+	buf[plen] = 0u8;
+	return buf;
+};
+
+// build_dir_module_path — alloc <dir>/<base>.ww, NUL-terminated, in `a`.
+fn build_dir_module_path(a: *arena, dir: *u8, dlen: u64,
+                         base: *u8, blen: u64) *u8 = {
+	let need: u64 = dlen + 1u64 + blen + 3u64 + 1u64;
+	let buf: *u8 = amalloc(a, need): *u8;
+	let off: u64 = 0u64;
+	let i: u64 = 0u64;
+	for (i < dlen) { buf[off] = dir[i]; off += 1u64; i += 1u64; };
+	buf[off] = 47u8; off += 1u64;	// '/'
+	i = 0u64;
+	for (i < blen) { buf[off] = base[i]; off += 1u64; i += 1u64; };
+	buf[off] = 46u8;  off += 1u64;	// '.'
+	buf[off] = 119u8; off += 1u64;	// 'w'
+	buf[off] = 119u8; off += 1u64;	// 'w'
+	buf[off] = 0u8;
+	return buf;
+};
+
+// build_search_path — compose the colon-separated lookup path used by
+// resolve_module's case (4). Order: "." : <incs> : <self_dir>/../../lib
+fn build_search_path(a: *arena, self_dir: *u8, incs: *u8) *u8 = {
+	let buf: *u8 = amalloc(a, PATH_MAX * 2u64): *u8;
+	let off: u64 = 0u64;
+	buf[off] = 46u8; off += 1u64;	// '.'
+	if (incs != nil) {
+		if (incs[0u64] != 0u8) {
+			buf[off] = 58u8; off += 1u64;	// ':'
+			off = cstr_into(buf, off, incs);
+		};
+	};
+	buf[off] = 58u8; off += 1u64;
+	off = cstr_into(buf, off, self_dir);
+	off = str_into(buf, off, "/../../lib");
+	cstr_seal(buf, off);
+	return buf;
+};
+
+fn resolve_module(a: *arena, self_dir: *u8, name: *u8, incs: *u8) *u8 = {
+	let nlen: u64 = cstrlen(name);
+
+	// (1) literal .ww file that exists
+	if (cstr_endswith_lit(name, ".ww")) {
+		if (os.access(name, 0i32) == 0) {
+			return arena_dup_cstr(a, name, nlen);
+		};
+	};
+
+	// (2) "." → cwd's <basename>.ww
+	if (nlen == 1u64) {
+		if (name[0u64] == 46u8) {	// '.'
+			let cwd: *u8 = amalloc(a, PATH_MAX): *u8;
+			let r: i64 = os.getcwd(cwd, PATH_MAX);
+			if (r <= 0i64) { return nil; };
+			let cwdlen: u64 = (r: u64) - 1u64;	// strip trailing NUL
+			let bo: u64 = basename_off(cwd, cwdlen);
+			let blen: u64 = cwdlen - bo;
+			let dot: *u8 = amalloc(a, 2u64): *u8;
+			dot[0] = 46u8; dot[1] = 0u8;
+			let probe: *u8 = build_dir_module_path(a, dot, 1u64,
+			    cwd + bo, blen);
+			if (os.access(probe, 0i32) == 0) { return probe; };
+			return nil;
+		};
+	};
+
+	// (3) <name>/<basename(name)>.ww — directory-as-module
+	let bo: u64 = basename_off(name, nlen);
+	let probe: *u8 = build_dir_module_path(a, name, nlen,
+	    name + bo, nlen - bo);
+	if (os.access(probe, 0i32) == 0) { return probe; };
+
+	// (4) search path lookup
+	let search: *u8 = build_search_path(a, self_dir, incs);
+	return locate_import(a, search, name, nlen);
+};
+
 // ---- Subcommand handlers ----------------------------------------------
 
 fn write_usage(fd: i32) void = {
-	let s: str = "usage: ww [-V] <subcommand> [args...]\n  -V              print version and exit\n  build  <path>   compile module to a static binary\n  run    <path>   build then exec\n  version         print version and exit\n";
+	let s: str = "usage: ww [-V] <subcommand> [args...]\n  -V                print version and exit\n  build  [path]     compile module to a static binary (path defaults to cwd)\n  run    [path] ... build then exec, passing extra args to the program\n  test   [path]     build and run *_test.ww in the module (path defaults to cwd)\n  version           print version and exit\n\n  path forms:\n    foo.ww          literal file\n    foo             search cwd, -I dirs, then $WW_LIB-equiv for foo.ww or foo/foo.ww\n    lib/foo         directory: build lib/foo/foo.ww\n    .               build the cwd's <basename>.ww\n";
 	os.write(fd, s.ptr, s.len: u64);
 };
 
@@ -894,6 +1044,7 @@ fn default_out_path(src: *u8) *u8 = {
 };
 
 fn do_build(self_dir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
+	let a: *arena = newarena();
 	let src: *u8 = nil;
 	let incs: *u8 = os.alloc(PATH_MAX * 2u64): *u8;
 	let inc_off: u64 = 0u64;
@@ -974,16 +1125,23 @@ fn do_build(self_dir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 	};
 
 	if (src == nil) {
-		os.write(2, "ww build: missing source\n".ptr, 25u64);
+		// default to cwd module
-		return 2;
+		let dot: *u8 = amalloc(a, 2u64): *u8;
+		dot[0] = 46u8; dot[1] = 0u8;
+		src = dot;
 	};
-	let out: *u8 = default_out_path(src);
+	let resolved: *u8 = resolve_module(a, self_dir, src, incs);
+	if (resolved == nil) {
+		os.write(2, "ww build: cannot find module\n".ptr, 29u64);
+		return 1;
+	};
+	let out: *u8 = default_out_path(resolved);
 	let lf: lflags;
 	lf.libdirs = libdirs;
 	lf.n_libdirs = n_libdirs;
 	lf.libs = libs;
 	lf.n_libs = n_libs;
-	return build_one(self_dir, src, out, incs, &lf);
+	return build_one(self_dir, resolved, out, incs, &lf);
 };
 
 // Format the scratch path /tmp/ww_run_<pid> into buf. Returns NUL-
@@ -1017,13 +1175,149 @@ fn make_run_tmp(buf: *u8) void = {
 };
 
 fn do_run(self_dir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
-	if (start >= argc) {
+	let a: *arena = newarena();
-		os.write(2, "ww run: missing source\n".ptr, 23u64);
+	let src: *u8 = nil;
+	let pass_start: i32 = -1;	// first argv idx to pass through to program
+	let incs: *u8 = os.alloc(PATH_MAX * 2u64): *u8;
+	let inc_off: u64 = 0u64;
+	cstr_seal(incs, 0u64);
+
+	let max_lflags: i32 = 32;
+	let libdirs: **u8 = os.alloc((max_lflags: u64) * 8u64): **u8;
+	let n_libdirs: i32 = 0;
+	let libs:    **u8 = os.alloc((max_lflags: u64) * 8u64): **u8;
+	let n_libs:   i32 = 0;
+
+	let i: i32 = start;
+	for (i < argc) {
+		if (pass_start >= 0) { i = argc; }	// stop, leave rest for exec
+		else {
+		let p: *u8 = argv[i];
+		if (p[0u64] == 45u8) {
+			if (p[1u64] == 73u8) {
+				let dir: *u8 = nil;
+				if (p[2u64] != 0u8) {
+					dir = p + 2u64;
+				} else {
+					if (i + 1 >= argc) {
+						os.write(2, "ww run: -I needs an argument\n".ptr, 29u64);
 						return 2;
 					};
+					i += 1;
+					dir = argv[i];
+				};
+				if (inc_off > 0u64) {
+					incs[inc_off] = 58u8;
+					inc_off += 1u64;
+				};
+				inc_off = cstr_into(incs, inc_off, dir);
+				cstr_seal(incs, inc_off);
+			} else { if (p[1u64] == 76u8) {
+				let dir: *u8 = nil;
+				if (p[2u64] != 0u8) {
+					dir = p + 2u64;
+				} else {
+					if (i + 1 >= argc) {
+						os.write(2, "ww run: -L needs an argument\n".ptr, 29u64);
+						return 2;
+					};
+					i += 1;
+					dir = argv[i];
+				};
+				if (n_libdirs >= max_lflags) {
+					os.write(2, "ww run: too many -L\n".ptr, 20u64);
+					return 2;
+				};
+				libdirs[n_libdirs] = dir;
+				n_libdirs += 1;
+			} else { if (p[1u64] == 108u8) {
+				let nm: *u8 = nil;
+				if (p[2u64] != 0u8) {
+					nm = p + 2u64;
+				} else {
+					if (i + 1 >= argc) {
+						os.write(2, "ww run: -l needs an argument\n".ptr, 29u64);
+						return 2;
+					};
+					i += 1;
+					nm = argv[i];
+				};
+				if (n_libs >= max_lflags) {
+					os.write(2, "ww run: too many -l\n".ptr, 20u64);
+					return 2;
+				};
+				libs[n_libs] = nm;
+				n_libs += 1;
+			} else {
+				os.write(2, "ww run: unknown flag\n".ptr, 21u64);
+				return 2;
+			}; }; };
+			i += 1;
+		} else {
+			if (src == nil) {
+				src = p;
+				i += 1;
+			} else {
+				pass_start = i;	// remaining args go to the program
+			};
+		};
+		};
+	};
+
+	if (src == nil) {
+		let dot: *u8 = amalloc(a, 2u64): *u8;
+		dot[0] = 46u8; dot[1] = 0u8;
+		src = dot;
+	};
+	let resolved: *u8 = resolve_module(a, self_dir, src, incs);
+	if (resolved == nil) {
+		os.write(2, "ww run: cannot find module\n".ptr, 27u64);
+		return 1;
+	};
+
 	let tmp: *u8 = os.alloc(PATH_MAX): *u8;
 	make_run_tmp(tmp);
-	if (build_one(self_dir, argv[start], tmp, "\0".ptr, nil) != 0) { return 1; };
+	let lf: lflags;
+	lf.libdirs = libdirs;
+	lf.n_libdirs = n_libdirs;
+	lf.libs = libs;
+	lf.n_libs = n_libs;
+	if (build_one(self_dir, resolved, tmp, incs, &lf) != 0) {
+		os.unlink(tmp);
+		return 1;
+	};
+
+	// exec with [tmp, argv[pass_start..argc), nil]
+	let n_extra: i32 = 0;
+	if (pass_start >= 0) { n_extra = argc - pass_start; };
+	let total: i32 = n_extra + 2;
+	let exec_argv: **u8 = os.alloc((total: u64) * 8u64): **u8;
+	exec_argv[0] = tmp;
+	let k: i32 = 0;
+	for (k < n_extra) {
+		exec_argv[k + 1] = argv[pass_start + k];
+		k += 1;
+	};
+	exec_argv[n_extra + 1] = nil;
+	let rc: i32 = proc_run(tmp, exec_argv);
+	os.unlink(tmp);
+	return rc;
+};
+
+// ---- ww test ----------------------------------------------------------
+//
+// Mirrors cmd/ww/main.c:do_test. Two modes:
+//   single-file: build+run a literal *.ww file, return its exit code
+//   directory:   open the dir, getdents64, build+run each *_test.ww,
+//                report ok/FAIL per file, return 0 iff all pass.
+
+fn run_single_test(self_dir: *u8, src: *u8) i32 = {
+	let tmp: *u8 = os.alloc(PATH_MAX): *u8;
+	make_run_tmp(tmp);
+	if (build_one(self_dir, src, tmp, "\0".ptr, nil) != 0) {
+		os.unlink(tmp);
+		return 1;
+	};
 	let exec_argv: **u8 = os.alloc(16u64): **u8;
 	exec_argv[0] = tmp;
 	exec_argv[1] = nil;
@@ -1032,6 +1326,100 @@ fn do_run(self_dir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 	return rc;
 };
 
+fn run_dir_tests(self_dir: *u8, dir: *u8) i32 = {
+	let fd: i32 = os.open(dir, os.O_RDONLY, 0i32);
+	if (fd < 0) {
+		os.write(2, "ww test: cannot open directory\n".ptr, 31u64);
+		return 1;
+	};
+
+	let pass: i32 = 0;
+	let fail: i32 = 0;
+	let buf: *u8 = os.alloc(8192u64): *u8;
+	let dirlen: u64 = cstrlen(dir);
+
+	let n: i64 = os.getdents64(fd, buf, 8192u64);
+	for (n > 0i64) {
+		let off: u64 = 0u64;
+		let nu: u64 = n: u64;
+		for (off < nu) {
+			// d_reclen at offset+16 (u16 LE), d_name at offset+19 (cstr)
+			let blo: u64 = (buf[off + 16u64]): u64;
+			let bhi: u64 = (buf[off + 17u64]): u64;
+			let reclen: u64 = blo + (bhi * 256u64);
+			let name: *u8 = buf + off + 19u64;
+			if (cstr_endswith_lit(name, "_test.ww")) {
+				let nlen: u64 = cstrlen(name);
+				// path = <dir>/<name>
+				let path: *u8 = os.alloc(PATH_MAX): *u8;
+				let p_off: u64 = cstr_into(path, 0u64, dir);
+				path[p_off] = 47u8; p_off += 1u64;
+				let i: u64 = 0u64;
+				for (i < nlen) { path[p_off + i] = name[i]; i += 1u64; };
+				p_off += nlen;
+				cstr_seal(path, p_off);
+				// incs = <dir> so test files can `use ` siblings
+				let tincs: *u8 = os.alloc(PATH_MAX): *u8;
+				let ic: u64 = cstr_into(tincs, 0u64, dir);
+				cstr_seal(tincs, ic);
+				let tmp: *u8 = os.alloc(PATH_MAX): *u8;
+				make_run_tmp(tmp);
+				let bres: i32 = build_one(self_dir, path, tmp, tincs, nil);
+				if (bres != 0) {
+					fail += 1;
+					os.write(2, "FAIL ".ptr, 5u64);
+					os.write(2, name, nlen);
+					os.write(2, " (build)\n".ptr, 9u64);
+				} else {
+					let exec_argv: **u8 = os.alloc(16u64): **u8;
+					exec_argv[0] = tmp;
+					exec_argv[1] = nil;
+					let rc: i32 = proc_run(tmp, exec_argv);
+					if (rc == 0) {
+						pass += 1;
+						os.write(1, "ok   ".ptr, 5u64);
+						os.write(1, name, nlen);
+						os.write(1, "\n".ptr, 1u64);
+					} else {
+						fail += 1;
+						os.write(2, "FAIL ".ptr, 5u64);
+						os.write(2, name, nlen);
+						os.write(2, "\n".ptr, 1u64);
+					};
+				};
+				os.unlink(tmp);
+			};
+			off += reclen;
+		};
+		n = os.getdents64(fd, buf, 8192u64);
+	};
+	os.close(fd);
+	if (fail == 0) { return 0; };
+	return 1;
+};
+
+fn do_test(self_dir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
+	let a: *arena = newarena();
+	let target: *u8;
+	if (start >= argc) {
+		let dot: *u8 = amalloc(a, 2u64): *u8;
+		dot[0] = 46u8; dot[1] = 0u8;
+		target = dot;
+	} else {
+		target = argv[start];
+	};
+
+	// single-file mode: literal *.ww that exists
+	if (cstr_endswith_lit(target, ".ww")) {
+		if (os.access(target, 0i32) == 0) {
+			return run_single_test(self_dir, target);
+		};
+	};
+
+	// otherwise treat target as a directory; enumerate *_test.ww
+	return run_dir_tests(self_dir, target);
+};
+
 // ---- Entry -------------------------------------------------------------
 
 export fn main(argc: i32, argv: **u8) i32 = {
@@ -1065,6 +1453,9 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	if (cstreq_lit(cmd, "run")) {
 		return do_run(self_dir, argv, argc, 2);
 	};
+	if (cstreq_lit(cmd, "test")) {
+		return do_test(self_dir, argv, argc, 2);
+	};
 	os.write(2, "ww: unknown subcommand\n".ptr, 23u64);
 	write_usage(2);
 	return 2;

selfhost/cmd/ww/main.ww

@@ -2,13 +2,13 @@
 //
 // The user-facing driver. Plan 9 cc(1) / Hare hare(1) analogue:
 //
-//   ww build foo.ww  →  6c foo.ww > foo.s ; 6a foo.s > foo.o ;
+//   ww build foo.ww  →  w6c foo.ww > foo.s ; w6a foo.s > foo.o ;
-//                       6l -o foo foo.o libwwrt.a
+//                       w6l -o foo foo.o libwwrt.a
 //   ww run   foo.ww  →  build then exec
 //   ww version       →  print version
 //
 // Tool paths default to siblings of $0 so a fresh build runs out of
-// out/bin/. Env-var overrides (WW_6C / WW_6A / WW_6L / WW_LIB) are
+// out/bin/. Env-var overrides (WW_W6C / WW_W6A / WW_W6L / WW_LIB) are
 // not yet supported in this port; the bootstrap doesn't need them.
 
 use os;
@@ -408,7 +408,7 @@ fn append_lit(stem: *u8, suffix: str) *u8 = {
 };
 
 // linker flags bundled as a struct so build_one stays at the wwstage
-// 6c's 6-argument calling-convention limit.
+// w6c's 6-argument calling-convention limit.
 type lflags = struct {
 	libdirs:   **u8,
 	n_libdirs: i32,
@@ -418,7 +418,7 @@ type lflags = struct {
 
 // build_one — compile `src` into the executable named `out`.
 //   self_dir:  NUL-terminated dir containing this driver and the
-//              wwstage tools (6c_ww/6a_ww/6l_ww)
+//              wwstage tools (w6c_ww/w6a_ww/w6l_ww)
 //   src:       NUL-terminated path to the .ww file
 //   out:       NUL-terminated desired output path
 //   incs:      NUL-terminated colon-list of -I dirs (may be empty)
@@ -426,14 +426,14 @@ type lflags = struct {
 //
 // The ww-side driver shells to the ww-side tools so a `ww_ww build`
 // touches no C-built code at runtime. The C `ww` driver in cmd/ww/
-// still drives the C-built 6c/6a/6l. Test 993 pins the two
+// still drives the C-built w6c/w6a/w6l. Test 993 pins the two
 // pipelines to byte-identical output on a corpus.
 fn build_one(self_dir: *u8, src: *u8, out: *u8, incs: *u8, lf: *lflags) i32 = {
 	let a: *arena = newarena();
 
-	let c6: *u8 = join_path_lit(self_dir, "6c_ww");
+	let c6: *u8 = join_path_lit(self_dir, "w6c_ww");
-	let a6: *u8 = join_path_lit(self_dir, "6a_ww");
+	let a6: *u8 = join_path_lit(self_dir, "w6a_ww");
-	let l6: *u8 = join_path_lit(self_dir, "6l_ww");
+	let l6: *u8 = join_path_lit(self_dir, "w6l_ww");
 
 	// Default lib search path: <self_dir>/../../lib
 	let dotdot_lib: *u8 = os.alloc(PATH_MAX): *u8;
@@ -486,35 +486,35 @@ fn build_one(self_dir: *u8, src: *u8, out: *u8, incs: *u8, lf: *lflags) i32 = {
 	};
 	os.close(cf);
 
-	// Step 2: 6c -o <stem>.s <stem>.combined.ww
+	// Step 2: w6c -o <stem>.s <stem>.combined.ww
 	{
 		let argv: **u8 = os.alloc(40u64): **u8;
-		argv[0] = "6c\0".ptr;
+		argv[0] = "w6c\0".ptr;
 		argv[1] = "-o\0".ptr;
 		argv[2] = asmf;
 		argv[3] = combined;
 		argv[4] = nil;
 		if (proc_run(c6, argv) != 0) {
-			os.write(2, "ww: 6c failed\n".ptr, 14u64);
+			os.write(2, "ww: w6c failed\n".ptr, 15u64);
 			return 1;
 		};
 	};
 
-	// Step 3: 6a -o <stem>.o <stem>.s
+	// Step 3: w6a -o <stem>.o <stem>.s
 	{
 		let argv: **u8 = os.alloc(40u64): **u8;
-		argv[0] = "6a\0".ptr;
+		argv[0] = "w6a\0".ptr;
 		argv[1] = "-o\0".ptr;
 		argv[2] = objf;
 		argv[3] = asmf;
 		argv[4] = nil;
 		if (proc_run(a6, argv) != 0) {
-			os.write(2, "ww: 6a failed\n".ptr, 14u64);
+			os.write(2, "ww: w6a failed\n".ptr, 15u64);
 			return 1;
 		};
 	};
 
-	// Step 4: 6l -o <out> <stem>.o libwwrt.a [-L<dir>...] [-l<name>...]
+	// Step 4: w6l -o <out> <stem>.o libwwrt.a [-L<dir>...] [-l<name>...]
 	{
 		let nl_dirs: i32 = 0;
 		let nl_libs: i32 = 0;
@@ -526,13 +526,13 @@ fn build_one(self_dir: *u8, src: *u8, out: *u8, incs: *u8, lf: *lflags) i32 = {
 			l_dirs  = lf.libdirs;
 			l_libs  = lf.libs;
 		};
-		// argv slots: 5 fixed (6l, -o, out, objf, libwwrt)
+		// argv slots: 5 fixed (w6l, -o, out, objf, libwwrt)
 		//           + 2 * n_libdirs (-L, dir)
 		//           + 2 * n_libs    (-l, name)
 		//           + 1 nil terminator.
 		let total: i32 = 5 + 2 * nl_dirs + 2 * nl_libs + 1;
 		let argv: **u8 = os.alloc((total: u64) * 8u64): **u8;
-		argv[0] = "6l\0".ptr;
+		argv[0] = "w6l\0".ptr;
 		argv[1] = "-o\0".ptr;
 		argv[2] = out;
 		argv[3] = objf;
@@ -554,17 +554,139 @@ fn build_one(self_dir: *u8, src: *u8, out: *u8, incs: *u8, lf: *lflags) i32 = {
 		};
 		argv[pos] = nil;
 		if (proc_run(l6, argv) != 0) {
-			os.write(2, "ww: 6l failed\n".ptr, 14u64);
+			os.write(2, "ww: w6l failed\n".ptr, 15u64);
 			return 1;
 		};
 	};
 	return 0;
 };
 
+// ---- Module-by-name resolution ----------------------------------------
+//
+// Mirrors cmd/ww/main.c:resolve_module. Maps a name like "foo", "lib/foo",
+// "foo.ww", or "." to a concrete .ww file path:
+//   1. literal <name>.ww that exists                → use as-is
+//   2. "."  → <cwd>/<basename(cwd)>.ww              → that, if it exists
+//   3. <name>/<basename(name)>.ww                   → that, if it exists
+//   4. walk search path (cwd:incs:<self_dir>/../../lib):
+//        <dir>/<name>.ww  or  <dir>/<name>/<name>.ww
+
+fn cstr_endswith_lit(p: *u8, lit: str) bool = {
+	let plen: u64 = cstrlen(p);
+	let slen: u64 = lit.len: u64;
+	if (plen < slen) { return false; };
+	let off: u64 = plen - slen;
+	let i: i32 = 0;
+	for (i < lit.len) {
+		let iu: u64 = i: u64;
+		if (p[off + iu] != lit[i]) { return false; };
+		i += 1;
+	};
+	return true;
+};
+
+// basename_off — return the offset of the last path segment within `p`
+// (i.e. one past the final '/'). Returns 0 if there's no slash.
+fn basename_off(p: *u8, plen: u64) u64 = {
+	let start: u64 = 0u64;
+	let i: u64 = 0u64;
+	for (i < plen) {
+		if (p[i] == 47u8) { start = i + 1u64; };	// '/'
+		i += 1u64;
+	};
+	return start;
+};
+
+// arena_dup_cstr — copy `plen` bytes from `src` into a fresh NUL-sealed
+// arena buffer.
+fn arena_dup_cstr(a: *arena, src: *u8, plen: u64) *u8 = {
+	let buf: *u8 = amalloc(a, plen + 1u64): *u8;
+	let i: u64 = 0u64;
+	for (i < plen) { buf[i] = src[i]; i += 1u64; };
+	buf[plen] = 0u8;
+	return buf;
+};
+
+// build_dir_module_path — alloc <dir>/<base>.ww, NUL-terminated, in `a`.
+fn build_dir_module_path(a: *arena, dir: *u8, dlen: u64,
+                         base: *u8, blen: u64) *u8 = {
+	let need: u64 = dlen + 1u64 + blen + 3u64 + 1u64;
+	let buf: *u8 = amalloc(a, need): *u8;
+	let off: u64 = 0u64;
+	let i: u64 = 0u64;
+	for (i < dlen) { buf[off] = dir[i]; off += 1u64; i += 1u64; };
+	buf[off] = 47u8; off += 1u64;	// '/'
+	i = 0u64;
+	for (i < blen) { buf[off] = base[i]; off += 1u64; i += 1u64; };
+	buf[off] = 46u8;  off += 1u64;	// '.'
+	buf[off] = 119u8; off += 1u64;	// 'w'
+	buf[off] = 119u8; off += 1u64;	// 'w'
+	buf[off] = 0u8;
+	return buf;
+};
+
+// build_search_path — compose the colon-separated lookup path used by
+// resolve_module's case (4). Order: "." : <incs> : <self_dir>/../../lib
+fn build_search_path(a: *arena, self_dir: *u8, incs: *u8) *u8 = {
+	let buf: *u8 = amalloc(a, PATH_MAX * 2u64): *u8;
+	let off: u64 = 0u64;
+	buf[off] = 46u8; off += 1u64;	// '.'
+	if (incs != nil) {
+		if (incs[0u64] != 0u8) {
+			buf[off] = 58u8; off += 1u64;	// ':'
+			off = cstr_into(buf, off, incs);
+		};
+	};
+	buf[off] = 58u8; off += 1u64;
+	off = cstr_into(buf, off, self_dir);
+	off = str_into(buf, off, "/../../lib");
+	cstr_seal(buf, off);
+	return buf;
+};
+
+fn resolve_module(a: *arena, self_dir: *u8, name: *u8, incs: *u8) *u8 = {
+	let nlen: u64 = cstrlen(name);
+
+	// (1) literal .ww file that exists
+	if (cstr_endswith_lit(name, ".ww")) {
+		if (os.access(name, 0i32) == 0) {
+			return arena_dup_cstr(a, name, nlen);
+		};
+	};
+
+	// (2) "." → cwd's <basename>.ww
+	if (nlen == 1u64) {
+		if (name[0u64] == 46u8) {	// '.'
+			let cwd: *u8 = amalloc(a, PATH_MAX): *u8;
+			let r: i64 = os.getcwd(cwd, PATH_MAX);
+			if (r <= 0i64) { return nil; };
+			let cwdlen: u64 = (r: u64) - 1u64;	// strip trailing NUL
+			let bo: u64 = basename_off(cwd, cwdlen);
+			let blen: u64 = cwdlen - bo;
+			let dot: *u8 = amalloc(a, 2u64): *u8;
+			dot[0] = 46u8; dot[1] = 0u8;
+			let probe: *u8 = build_dir_module_path(a, dot, 1u64,
+			    cwd + bo, blen);
+			if (os.access(probe, 0i32) == 0) { return probe; };
+			return nil;
+		};
+	};
+
+	// (3) <name>/<basename(name)>.ww — directory-as-module
+	let bo: u64 = basename_off(name, nlen);
+	let probe: *u8 = build_dir_module_path(a, name, nlen,
+	    name + bo, nlen - bo);
+	if (os.access(probe, 0i32) == 0) { return probe; };
+
+	// (4) search path lookup
+	let search: *u8 = build_search_path(a, self_dir, incs);
+	return locate_import(a, search, name, nlen);
+};
+
 // ---- Subcommand handlers ----------------------------------------------
 
 fn write_usage(fd: i32) void = {
-	let s: str = "usage: ww [-V] <subcommand> [args...]\n  -V              print version and exit\n  build  <path>   compile module to a static binary\n  run    <path>   build then exec\n  version         print version and exit\n";
+	let s: str = "usage: ww [-V] <subcommand> [args...]\n  -V                print version and exit\n  build  [path]     compile module to a static binary (path defaults to cwd)\n  run    [path] ... build then exec, passing extra args to the program\n  test   [path]     build and run *_test.ww in the module (path defaults to cwd)\n  version           print version and exit\n\n  path forms:\n    foo.ww          literal file\n    foo             search cwd, -I dirs, then $WW_LIB-equiv for foo.ww or foo/foo.ww\n    lib/foo         directory: build lib/foo/foo.ww\n    .               build the cwd's <basename>.ww\n";
 	os.write(fd, s.ptr, s.len: u64);
 };
 
@@ -606,6 +728,7 @@ fn default_out_path(src: *u8) *u8 = {
 };
 
 fn do_build(self_dir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
+	let a: *arena = newarena();
 	let src: *u8 = nil;
 	let incs: *u8 = os.alloc(PATH_MAX * 2u64): *u8;
 	let inc_off: u64 = 0u64;
@@ -686,16 +809,23 @@ fn do_build(self_dir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 	};
 
 	if (src == nil) {
-		os.write(2, "ww build: missing source\n".ptr, 25u64);
+		// default to cwd module
-		return 2;
+		let dot: *u8 = amalloc(a, 2u64): *u8;
+		dot[0] = 46u8; dot[1] = 0u8;
+		src = dot;
 	};
-	let out: *u8 = default_out_path(src);
+	let resolved: *u8 = resolve_module(a, self_dir, src, incs);
+	if (resolved == nil) {
+		os.write(2, "ww build: cannot find module\n".ptr, 29u64);
+		return 1;
+	};
+	let out: *u8 = default_out_path(resolved);
 	let lf: lflags;
 	lf.libdirs = libdirs;
 	lf.n_libdirs = n_libdirs;
 	lf.libs = libs;
 	lf.n_libs = n_libs;
-	return build_one(self_dir, src, out, incs, &lf);
+	return build_one(self_dir, resolved, out, incs, &lf);
 };
 
 // Format the scratch path /tmp/ww_run_<pid> into buf. Returns NUL-
@@ -729,13 +859,149 @@ fn make_run_tmp(buf: *u8) void = {
 };
 
 fn do_run(self_dir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
-	if (start >= argc) {
+	let a: *arena = newarena();
-		os.write(2, "ww run: missing source\n".ptr, 23u64);
+	let src: *u8 = nil;
+	let pass_start: i32 = -1;	// first argv idx to pass through to program
+	let incs: *u8 = os.alloc(PATH_MAX * 2u64): *u8;
+	let inc_off: u64 = 0u64;
+	cstr_seal(incs, 0u64);
+
+	let max_lflags: i32 = 32;
+	let libdirs: **u8 = os.alloc((max_lflags: u64) * 8u64): **u8;
+	let n_libdirs: i32 = 0;
+	let libs:    **u8 = os.alloc((max_lflags: u64) * 8u64): **u8;
+	let n_libs:   i32 = 0;
+
+	let i: i32 = start;
+	for (i < argc) {
+		if (pass_start >= 0) { i = argc; }	// stop, leave rest for exec
+		else {
+		let p: *u8 = argv[i];
+		if (p[0u64] == 45u8) {
+			if (p[1u64] == 73u8) {
+				let dir: *u8 = nil;
+				if (p[2u64] != 0u8) {
+					dir = p + 2u64;
+				} else {
+					if (i + 1 >= argc) {
+						os.write(2, "ww run: -I needs an argument\n".ptr, 29u64);
 						return 2;
 					};
+					i += 1;
+					dir = argv[i];
+				};
+				if (inc_off > 0u64) {
+					incs[inc_off] = 58u8;
+					inc_off += 1u64;
+				};
+				inc_off = cstr_into(incs, inc_off, dir);
+				cstr_seal(incs, inc_off);
+			} else { if (p[1u64] == 76u8) {
+				let dir: *u8 = nil;
+				if (p[2u64] != 0u8) {
+					dir = p + 2u64;
+				} else {
+					if (i + 1 >= argc) {
+						os.write(2, "ww run: -L needs an argument\n".ptr, 29u64);
+						return 2;
+					};
+					i += 1;
+					dir = argv[i];
+				};
+				if (n_libdirs >= max_lflags) {
+					os.write(2, "ww run: too many -L\n".ptr, 20u64);
+					return 2;
+				};
+				libdirs[n_libdirs] = dir;
+				n_libdirs += 1;
+			} else { if (p[1u64] == 108u8) {
+				let nm: *u8 = nil;
+				if (p[2u64] != 0u8) {
+					nm = p + 2u64;
+				} else {
+					if (i + 1 >= argc) {
+						os.write(2, "ww run: -l needs an argument\n".ptr, 29u64);
+						return 2;
+					};
+					i += 1;
+					nm = argv[i];
+				};
+				if (n_libs >= max_lflags) {
+					os.write(2, "ww run: too many -l\n".ptr, 20u64);
+					return 2;
+				};
+				libs[n_libs] = nm;
+				n_libs += 1;
+			} else {
+				os.write(2, "ww run: unknown flag\n".ptr, 21u64);
+				return 2;
+			}; }; };
+			i += 1;
+		} else {
+			if (src == nil) {
+				src = p;
+				i += 1;
+			} else {
+				pass_start = i;	// remaining args go to the program
+			};
+		};
+		};
+	};
+
+	if (src == nil) {
+		let dot: *u8 = amalloc(a, 2u64): *u8;
+		dot[0] = 46u8; dot[1] = 0u8;
+		src = dot;
+	};
+	let resolved: *u8 = resolve_module(a, self_dir, src, incs);
+	if (resolved == nil) {
+		os.write(2, "ww run: cannot find module\n".ptr, 27u64);
+		return 1;
+	};
+
 	let tmp: *u8 = os.alloc(PATH_MAX): *u8;
 	make_run_tmp(tmp);
-	if (build_one(self_dir, argv[start], tmp, "\0".ptr, nil) != 0) { return 1; };
+	let lf: lflags;
+	lf.libdirs = libdirs;
+	lf.n_libdirs = n_libdirs;
+	lf.libs = libs;
+	lf.n_libs = n_libs;
+	if (build_one(self_dir, resolved, tmp, incs, &lf) != 0) {
+		os.unlink(tmp);
+		return 1;
+	};
+
+	// exec with [tmp, argv[pass_start..argc), nil]
+	let n_extra: i32 = 0;
+	if (pass_start >= 0) { n_extra = argc - pass_start; };
+	let total: i32 = n_extra + 2;
+	let exec_argv: **u8 = os.alloc((total: u64) * 8u64): **u8;
+	exec_argv[0] = tmp;
+	let k: i32 = 0;
+	for (k < n_extra) {
+		exec_argv[k + 1] = argv[pass_start + k];
+		k += 1;
+	};
+	exec_argv[n_extra + 1] = nil;
+	let rc: i32 = proc_run(tmp, exec_argv);
+	os.unlink(tmp);
+	return rc;
+};
+
+// ---- ww test ----------------------------------------------------------
+//
+// Mirrors cmd/ww/main.c:do_test. Two modes:
+//   single-file: build+run a literal *.ww file, return its exit code
+//   directory:   open the dir, getdents64, build+run each *_test.ww,
+//                report ok/FAIL per file, return 0 iff all pass.
+
+fn run_single_test(self_dir: *u8, src: *u8) i32 = {
+	let tmp: *u8 = os.alloc(PATH_MAX): *u8;
+	make_run_tmp(tmp);
+	if (build_one(self_dir, src, tmp, "\0".ptr, nil) != 0) {
+		os.unlink(tmp);
+		return 1;
+	};
 	let exec_argv: **u8 = os.alloc(16u64): **u8;
 	exec_argv[0] = tmp;
 	exec_argv[1] = nil;
@@ -744,6 +1010,100 @@ fn do_run(self_dir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 	return rc;
 };
 
+fn run_dir_tests(self_dir: *u8, dir: *u8) i32 = {
+	let fd: i32 = os.open(dir, os.O_RDONLY, 0i32);
+	if (fd < 0) {
+		os.write(2, "ww test: cannot open directory\n".ptr, 31u64);
+		return 1;
+	};
+
+	let pass: i32 = 0;
+	let fail: i32 = 0;
+	let buf: *u8 = os.alloc(8192u64): *u8;
+	let dirlen: u64 = cstrlen(dir);
+
+	let n: i64 = os.getdents64(fd, buf, 8192u64);
+	for (n > 0i64) {
+		let off: u64 = 0u64;
+		let nu: u64 = n: u64;
+		for (off < nu) {
+			// d_reclen at offset+16 (u16 LE), d_name at offset+19 (cstr)
+			let blo: u64 = (buf[off + 16u64]): u64;
+			let bhi: u64 = (buf[off + 17u64]): u64;
+			let reclen: u64 = blo + (bhi * 256u64);
+			let name: *u8 = buf + off + 19u64;
+			if (cstr_endswith_lit(name, "_test.ww")) {
+				let nlen: u64 = cstrlen(name);
+				// path = <dir>/<name>
+				let path: *u8 = os.alloc(PATH_MAX): *u8;
+				let p_off: u64 = cstr_into(path, 0u64, dir);
+				path[p_off] = 47u8; p_off += 1u64;
+				let i: u64 = 0u64;
+				for (i < nlen) { path[p_off + i] = name[i]; i += 1u64; };
+				p_off += nlen;
+				cstr_seal(path, p_off);
+				// incs = <dir> so test files can `use ` siblings
+				let tincs: *u8 = os.alloc(PATH_MAX): *u8;
+				let ic: u64 = cstr_into(tincs, 0u64, dir);
+				cstr_seal(tincs, ic);
+				let tmp: *u8 = os.alloc(PATH_MAX): *u8;
+				make_run_tmp(tmp);
+				let bres: i32 = build_one(self_dir, path, tmp, tincs, nil);
+				if (bres != 0) {
+					fail += 1;
+					os.write(2, "FAIL ".ptr, 5u64);
+					os.write(2, name, nlen);
+					os.write(2, " (build)\n".ptr, 9u64);
+				} else {
+					let exec_argv: **u8 = os.alloc(16u64): **u8;
+					exec_argv[0] = tmp;
+					exec_argv[1] = nil;
+					let rc: i32 = proc_run(tmp, exec_argv);
+					if (rc == 0) {
+						pass += 1;
+						os.write(1, "ok   ".ptr, 5u64);
+						os.write(1, name, nlen);
+						os.write(1, "\n".ptr, 1u64);
+					} else {
+						fail += 1;
+						os.write(2, "FAIL ".ptr, 5u64);
+						os.write(2, name, nlen);
+						os.write(2, "\n".ptr, 1u64);
+					};
+				};
+				os.unlink(tmp);
+			};
+			off += reclen;
+		};
+		n = os.getdents64(fd, buf, 8192u64);
+	};
+	os.close(fd);
+	if (fail == 0) { return 0; };
+	return 1;
+};
+
+fn do_test(self_dir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
+	let a: *arena = newarena();
+	let target: *u8;
+	if (start >= argc) {
+		let dot: *u8 = amalloc(a, 2u64): *u8;
+		dot[0] = 46u8; dot[1] = 0u8;
+		target = dot;
+	} else {
+		target = argv[start];
+	};
+
+	// single-file mode: literal *.ww that exists
+	if (cstr_endswith_lit(target, ".ww")) {
+		if (os.access(target, 0i32) == 0) {
+			return run_single_test(self_dir, target);
+		};
+	};
+
+	// otherwise treat target as a directory; enumerate *_test.ww
+	return run_dir_tests(self_dir, target);
+};
+
 // ---- Entry -------------------------------------------------------------
 
 export fn main(argc: i32, argv: **u8) i32 = {
@@ -777,6 +1137,9 @@ export fn main(argc: i32, argv: **u8) i32 = {
 	if (cstreq_lit(cmd, "run")) {
 		return do_run(self_dir, argv, argc, 2);
 	};
+	if (cstreq_lit(cmd, "test")) {
+		return do_test(self_dir, argv, argc, 2);
+	};
 	os.write(2, "ww: unknown subcommand\n".ptr, 23u64);
 	write_usage(2);
 	return 2;

selfhost/cmd/wwdump/main.combined.ww

@@ -31,6 +31,8 @@ def SYS_EXECVE: i64 = 59;
 def SYS_EXIT:        i64 = 60;
 def SYS_WAIT4:       i64 = 61;
 def SYS_UNLINK:      i64 = 87;
+def SYS_GETCWD:      i64 = 79;
+def SYS_GETDENTS64:  i64 = 217;
 
 // open(2) flags. Linux values, matching <fcntl.h>.
 def O_RDONLY: i32 = 0;
@@ -65,7 +67,7 @@ export fn close(fd: i32) i32 = {
 
 // dup2(2): make `newfd` refer to the same description as `oldfd`,
 // closing `newfd` first if open. Returns `newfd` on success or a
-// negative errno. Used by 6c_ww to redirect stdout into an output
+// negative errno. Used by w6c_ww to redirect stdout into an output
 // file without changing the cgen emit path.
 export fn dup2(oldfd: i32, newfd: i32) i32 = {
 	return syscall2(SYS_DUP2, oldfd: i64, newfd: i64): i32;
@@ -179,7 +181,33 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 	    options: i64, rusage: i64): i32;
 };
 
-// selfhost/cmd/wwc/mem.ww — port of cmd/wwc/mem.c.
+// getcwd(2) — Linux flavour. Writes the NUL-terminated cwd into `buf`
+// and returns the number of bytes written (including the NUL), or a
+// negative errno. The driver uses it to expand `.` to the cwd's
+// basename for `ww build` / `ww test`.
+export fn getcwd(buf: *u8, n: u64) i64 = {
+	return syscall2(SYS_GETCWD, buf: i64, n: i64);
+};
+
+// getdents64(2) — Linux directory enumeration. The fd must be opened
+// with O_RDONLY on a directory. `buf` receives a packed sequence of
+// linux_dirent64 records:
+//
+//   struct linux_dirent64 {
+//       u64  d_ino;       // 0..7
+//       i64  d_off;       // 8..15
+//       u16  d_reclen;    // 16..17  — total bytes for this record
+//       u8   d_type;      // 18      — DT_REG/DT_DIR/...
+//       u8   d_name[];    // 19..    — NUL-terminated name + padding
+//   };
+//
+// Returns bytes written into `buf` (advance by d_reclen to walk),
+// 0 at end-of-directory, or a negative errno.
+export fn getdents64(fd: i32, buf: *u8, n: u64) i64 = {
+	return syscall3(SYS_GETDENTS64, fd: i64, buf: i64, n: i64);
+};
+
+// selfhost/cmd/wcc/mem.ww — port of cmd/wcc/mem.c.
 //
 // Bump arena allocator. Backed by the runtime page allocator
 // (rt_alloc / rt_free), no libc. Each chunk is mmap'd; when the
@@ -187,7 +215,7 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 // unmaps the chain.
 //
 // Memory handed out is 16-byte aligned. The C version under
-// cmd/wwc/ is retained until the three-stage bootstrap diffs clean.
+// cmd/wcc/ is retained until the three-stage bootstrap diffs clean.
 
 use os;
 
@@ -406,8 +434,8 @@ export fn parseu64(s: str) (u64 | str) = {
 	return v;
 };
 
-// selfhost/cmd/wwc/tok.ww — port of cmd/wwc/tok.c plus the Tkind /
+// selfhost/cmd/wcc/tok.ww — port of cmd/wcc/tok.c plus the Tkind /
-// Tok / Pos shapes from cmd/wwc/ww.h.
+// Tok / Pos shapes from cmd/wcc/ww.h.
 //
 // Token kind values must stay numerically equal to the C side: the
 // 990_selfhost test diffs ww-side wwdump output against C-side
@@ -415,13 +443,13 @@ export fn parseu64(s: str) (u64 | str) = {
 // integers and breaks the diff.
 //
 // Bottom of file: tokprint, which emits one token per line in a
-// format identical to cmd/wwc/tok.c:tokprint().
+// format identical to cmd/wcc/tok.c:tokprint().
 
 use os;
 use strconv;
 
 // ---- Tkind ------------------------------------------------------------
-// Mirror of the C enum in cmd/wwc/ww.h. Don't reorder.
+// Mirror of the C enum in cmd/wcc/ww.h. Don't reorder.
 
 def TK_NONE:     i32 = 0;
 def TK_EOF:      i32 = 1;
@@ -516,7 +544,7 @@ def TK_LAST: i32 = 80;
 // ---- Pos / Tok --------------------------------------------------------
 //
 // `pos` is used at error-reporting boundaries; we always pass it via
-// *pos so the value never gets struct-copied (6c can't yet copy a
+// *pos so the value never gets struct-copied (w6c can't yet copy a
 // 24-byte struct).
 //
 // `tok` is flat — file/line/col live directly on the token rather than
@@ -554,7 +582,7 @@ fn streq_n(a: *u8, b: str, n: i32) bool = {
 
 // kwlookup — returns the matching TK_* keyword kind for a byte run,
 // or TK_NONE if it's an ordinary identifier. Linear search over a
-// small alphabetised list, matching cmd/wwc/tok.c.
+// small alphabetised list, matching cmd/wcc/tok.c.
 export fn kwlookup(p: *u8, n: i32) i32 = {
 	if (streq_n(p, "as", n))       { return TK_AS; };
 	if (streq_n(p, "break", n))    { return TK_BREAK; };
@@ -683,7 +711,7 @@ export fn tokname(k: i32) str = {
 
 // ---- writer for tokprint ----------------------------------------------
 //
-// fputq mirrors cmd/wwc/tok.c:fputq — quote the string with C-style
+// fputq mirrors cmd/wcc/tok.c:fputq — quote the string with C-style
 // escapes for \, ", \n, \t, \r and \xNN for other non-printables.
 
 fn fputc_byte(fd: i32, b: u8) void = {
@@ -750,14 +778,14 @@ fn fputq(fd: i32, p: *u8, n: i32) void = {
 };
 
 // tokprint — write one token line to fd. Format must match
-// cmd/wwc/tok.c:tokprint() byte-for-byte: that's the diff anchor.
+// cmd/wcc/tok.c:tokprint() byte-for-byte: that's the diff anchor.
 //   "<file>:<line>:<col> <kindname>[ <value>]\n"
 //
-// Takes `t` by pointer because 6c can't yet pass a >16-byte struct
+// Takes `t` by pointer because w6c can't yet pass a >16-byte struct
 // by value; the C version takes Tok by value.
 export fn tokprint(fd: i32, t: *tok) void = {
 	// Chained-dot field reads (`t.x.y`) on str sub-fields aren't yet
-	// reduced by 6c — `t.x.y` returns the whole str. Lift the str
+	// reduced by w6c — `t.x.y` returns the whole str. Lift the str
 	// fields into locals so we can use the str pseudo-field path.
 	let tfile: str = t.file;
 	let ttext: str = t.text;
@@ -894,14 +922,14 @@ export fn toupper(c: u8) u8 = {
 	return c;
 };
 
-// selfhost/cmd/wwc/lex.ww — port of cmd/wwc/lex.c.
+// selfhost/cmd/wcc/lex.ww — port of cmd/wcc/lex.c.
 //
 // The DFA, the helpers, and the order of decisions all mirror the C
 // version exactly. The 990_selfhost test diffs the resulting token
 // stream against the C-side wwdump byte-for-byte; any divergence is
 // a port bug.
 //
-// Calling-convention note: 6c can't yet pass or return structs >16
+// Calling-convention note: w6c can't yet pass or return structs >16
 // bytes by value, so `tok` and `pos` are passed by pointer (out
 // params). The C version passes `Tok` by value; we differ here only
 // in shape, not in observable behaviour. Token kind values stay
@@ -1551,7 +1579,7 @@ export fn lexnext(l: *lex, out: *tok) void = {
 	out.text = astrndup(l.a, one.ptr, 1u64);
 };
 
-// selfhost/cmd/wwc/ast.ww — port of cmd/wwc/ast.c (Node defs + printer).
+// selfhost/cmd/wcc/ast.ww — port of cmd/wcc/ast.c (Node defs + printer).
 //
 // Status: AST printer is fully ported. Constructor `newnode` is here.
 // The parser (parse.ww) is currently minimal — see its file header.
@@ -1567,7 +1595,7 @@ use tok;
 
 // ---- Nkind ------------------------------------------------------------
 //
-// Mirror of cmd/wwc/ww.h Nkind. Values must stay numerically equal so
+// Mirror of cmd/wcc/ww.h Nkind. Values must stay numerically equal so
 // the AST diff probe in 990_selfhost works.
 
 def N_NONE:     i32 = 0;
@@ -1887,7 +1915,7 @@ export fn astprint(fd: i32, n: *node) void = {
 	pr(fd, n, 0);
 };
 
-// selfhost/cmd/wwc/parse.ww — port of cmd/wwc/parse.c.
+// selfhost/cmd/wcc/parse.ww — port of cmd/wcc/parse.c.
 //
 // Status: GROWING stub. Currently handles top-level `use IDENT;`,
 // `def NAME: TYPE = LIT;`, `type NAME = TYPE;`, and `fn NAME(params)
@@ -1900,7 +1928,7 @@ export fn astprint(fd: i32, n: *node) void = {
 // surface form lands here gradually so the AST diff in 990_selfhost
 // grows toward whole-language coverage one increment at a time.
 //
-// Calling-convention shim: 6c can't yet pass a sub-struct field
+// Calling-convention shim: w6c can't yet pass a sub-struct field
 // (e.g. p.cur.line where p.cur is a `tok` of size 76). The parser
 // stores the current token as flat primitive fields rather than a
 // nested `tok` struct; `refill` copies a freshly lexed token in.
@@ -2635,7 +2663,7 @@ fn parsestmt(p: *parser) *node = {
 	};
 	// expression statement, or tuple-destructure multi-assign:
 	//   a, b = expr;
-	// Mirrors cmd/wwc/parse.c:1015-1031. We parse the first lvalue
+	// Mirrors cmd/wcc/parse.c:1015-1031. We parse the first lvalue
 	// with parseexpr (matches the C side); subsequent lvalues go
 	// through parsebin(parseunary, 1) so the `=` stays for us to
 	// consume — parseexpr would absorb it.
@@ -2870,7 +2898,7 @@ export fn parsefile(p: *parser) *node = {
 	return f;
 };
 
-// selfhost/cmd/wwc/type.ww — port of cmd/wwc/type.c.
+// selfhost/cmd/wcc/type.ww — port of cmd/wcc/type.c.
 //
 // Status: full structural port. The C version uses module-globals for
 // the primitive types (ty_void, ty_i32, …); ww doesn't have writable
@@ -2882,7 +2910,7 @@ use os;
 use mem;
 
 // ---- TypeKind ---------------------------------------------------------
-// Numeric values must stay aligned with cmd/wwc/ww.h TypeKind so the
+// Numeric values must stay aligned with cmd/wcc/ww.h TypeKind so the
 // next diff signal (typed-AST printer / cgen) can compare across the
 // two implementations.
 
@@ -3200,7 +3228,7 @@ export fn type_eq(a: *tinfo, b: *tinfo) bool = {
 	return true;	// primitives match by kind alone
 };
 
-// selfhost/cmd/wwc/sym.ww — port of cmd/wwc/sym.c.
+// selfhost/cmd/wcc/sym.ww — port of cmd/wcc/sym.c.
 //
 // Per-scope hashtable, chained to the parent. Lookup walks up.
 // Plan 9 / Hare flavoured. Duplicate definitions in the same scope
@@ -3210,7 +3238,7 @@ use mem;
 use typ;
 use ast;
 
-// Symbol kinds — must stay numerically aligned with cmd/wwc/ww.h Skind.
+// Symbol kinds — must stay numerically aligned with cmd/wcc/ww.h Skind.
 def SK_NONE:  i32 = 0;
 def SK_VAR:   i32 = 1;
 def SK_PARAM: i32 = 2;
@@ -3314,11 +3342,11 @@ export fn scope_define(s: *scope, name: str, k: i32, t: *tinfo, decl: *node) *sy
 	return sy;
 };
 
-// selfhost/cmd/wwc/check.ww — minimal port of cmd/wwc/check.c.
+// selfhost/cmd/wcc/check.ww — minimal port of cmd/wcc/check.c.
 //
 // Status: name-resolution + primitive-type seeding only. Full type
 // inference, conversion rules, tagged-union dispatch typing, return-
-// type checking, etc. all live in cmd/wwc/check.c (937 lines) and
+// type checking, etc. all live in cmd/wcc/check.c (937 lines) and
 // will land here in subsequent commits.
 //
 // What this version does:
@@ -3562,10 +3590,10 @@ export fn check_file(c: *checker, file: *node) void = {
 	};
 };
 
-// selfhost/cmd/wwc/cgen.ww — port of cmd/6c/cgen.c.
+// selfhost/cmd/wcc/cgen.ww — port of cmd/w6c/cgen.c.
 //
 // Status: GROWING. Each subsystem we add is verified by `wwdump_ww -c`
-// producing byte-identical output to C-side `6c` for the same source,
+// producing byte-identical output to C-side `w6c` for the same source,
 // then by assembling + linking + running the result.
 //
 // Current coverage:
@@ -3760,7 +3788,7 @@ fn local_alloc(c: *cgen, name: str, sz: i32, tnode: *node) i32 = {
 fn local_add(c: *cgen, name: str, sz: i32, tnode: *node) i32 = {
 	// Name-based slot reuse for N_LETs and params: if `name` is
 	// already declared in this function, return its existing
-	// offset. Mirrors C cgen (cmd/6c/cgen.c:localoff). Two
+	// offset. Mirrors C cgen (cmd/w6c/cgen.c:localoff). Two
 	// disjoint scopes that declare the same name share one slot —
 	// so `escape` in wwdump (three `let cp: pos;` across separate
 	// branches) reserves one slot, not three. scan_locals does
@@ -4097,7 +4125,7 @@ fn fnret_lookup(c: *cgen, name: str) *node = {
 
 // ---- def-constant registry ------------------------------------------
 //
-// `def NAME: T = LIT;` becomes a DATA symbol the C-side 6c emits; an
+// `def NAME: T = LIT;` becomes a DATA symbol the C-side w6c emits; an
 // ident reference loads it via `MOVQ NAME(SB), AX`. We collect them at
 // file load and consult on N_IDENT lookup.
 
@@ -4725,7 +4753,7 @@ fn node_isunsigned(c: *cgen, n: *node) bool = {
 	// Walks the base local's declared type and pulls the element
 	// out — *u8 → u8, [N]u32 → u32, []u64 → u64. Without this the
 	// compare-codegen for `p[i] >= 48u8` falls back to signed JGE
-	// instead of JAE, diverging from C 6c on byte indexing.
+	// instead of JAE, diverging from C w6c on byte indexing.
 	if (k == N_INDEX) {
 		let base: *node = n.lhs;
 		if (base != nil) {
@@ -5198,7 +5226,7 @@ fn cgexpr(c: *cgen, n: *node) void = {
 		// path the cgen falls through and AX retains whatever the
 		// inner expression left there — typically the *struct pointer
 		// itself, so reads silently get the pointer value instead of
-		// the field. (Showed up porting 6l/pass.ww.)
+		// the field. (Showed up porting w6l/pass.ww.)
 		if (lhs != nil) {
 			if (lhs.kind == N_DOT) {
 				let inner_t: *node = dot_inner_struct_ptr(c, lhs);
@@ -5487,7 +5515,7 @@ fn cgexpr(c: *cgen, n: *node) void = {
 						};
 						cgexpr(c, n.rhs);
 						// Push order matches C cgen
-						// (cmd/6c/cgen.c:1033-1041): PUSHQ AX
+						// (cmd/w6c/cgen.c:1033-1041): PUSHQ AX
 						// (ptr) first, then PUSHQ BX (len) if
 						// str, so the pop sequence is POP CX
 						// (len) → POP AX (ptr) → MOVQ AX,
@@ -6259,7 +6287,7 @@ fn cgstmt(c: *cgen, n: *node) void = {
 			};
 		} else {
 			// Bare `let x: T;` with no initializer. C cgen
-			// (cmd/6c/cgen.c:2181-2183) zero-inits only when
+			// (cmd/w6c/cgen.c:2181-2183) zero-inits only when
 			// the underlying type's natural size is 8 — pointers,
 			// i64/u64, function pointers, ints. Structs/arrays/
 			// slices/strings/tagged/tuples are left for per-field
@@ -6330,7 +6358,7 @@ fn cgstmt(c: *cgen, n: *node) void = {
 	// Tuple-destructure assign: `a, b = call();`. The call's tuple
 	// return lands in (AX, DX); push DX to free it, store AX into
 	// the first lvalue, then pop DX into the second. Mirrors
-	// cmd/6c/cgen.c:2424-2440. Lvalues beyond two are dropped (same
+	// cmd/w6c/cgen.c:2424-2440. Lvalues beyond two are dropped (same
 	// as C — no fixture uses >2 today).
 	if (k == N_MASSIGN) {
 		if (n.rhs != nil) { cgexpr(c, n.rhs); };

selfhost/test/smoke.combined.ww

@@ -31,6 +31,8 @@ def SYS_EXECVE: i64 = 59;
 def SYS_EXIT:        i64 = 60;
 def SYS_WAIT4:       i64 = 61;
 def SYS_UNLINK:      i64 = 87;
+def SYS_GETCWD:      i64 = 79;
+def SYS_GETDENTS64:  i64 = 217;
 
 // open(2) flags. Linux values, matching <fcntl.h>.
 def O_RDONLY: i32 = 0;
@@ -65,7 +67,7 @@ export fn close(fd: i32) i32 = {
 
 // dup2(2): make `newfd` refer to the same description as `oldfd`,
 // closing `newfd` first if open. Returns `newfd` on success or a
-// negative errno. Used by 6c_ww to redirect stdout into an output
+// negative errno. Used by w6c_ww to redirect stdout into an output
 // file without changing the cgen emit path.
 export fn dup2(oldfd: i32, newfd: i32) i32 = {
 	return syscall2(SYS_DUP2, oldfd: i64, newfd: i64): i32;
@@ -179,6 +181,32 @@ export fn wait4(pid: i32, status_out: *i32, options: i32, rusage: *void) i32 = {
 	    options: i64, rusage: i64): i32;
 };
 
+// getcwd(2) — Linux flavour. Writes the NUL-terminated cwd into `buf`
+// and returns the number of bytes written (including the NUL), or a
+// negative errno. The driver uses it to expand `.` to the cwd's
+// basename for `ww build` / `ww test`.
+export fn getcwd(buf: *u8, n: u64) i64 = {
+	return syscall2(SYS_GETCWD, buf: i64, n: i64);
+};
+
+// getdents64(2) — Linux directory enumeration. The fd must be opened
+// with O_RDONLY on a directory. `buf` receives a packed sequence of
+// linux_dirent64 records:
+//
+//   struct linux_dirent64 {
+//       u64  d_ino;       // 0..7
+//       i64  d_off;       // 8..15
+//       u16  d_reclen;    // 16..17  — total bytes for this record
+//       u8   d_type;      // 18      — DT_REG/DT_DIR/...
+//       u8   d_name[];    // 19..    — NUL-terminated name + padding
+//   };
+//
+// Returns bytes written into `buf` (advance by d_reclen to walk),
+// 0 at end-of-directory, or a negative errno.
+export fn getdents64(fd: i32, buf: *u8, n: u64) i64 = {
+	return syscall3(SYS_GETDENTS64, fd: i64, buf: i64, n: i64);
+};
+
 // strconv — number↔string conversions. Decimal i64 to/from a fixed
 // buffer. Two error idioms ship side by side:
 //   - Plan 9 style (atoi64): tuple `(value, ok)`. Pre-dates the
@@ -406,7 +434,7 @@ export fn toupper(c: u8) u8 = {
 // indicating which probe broke. The 990_selfhost test asserts 42.
 //
 // Note: only stack-local mutable state. Top-level `let` mutation
-// requires a writable .data segment in 6l, which is a separate
+// requires a writable .data segment in w6l, which is a separate
 // task; until then we exercise polymorphism via ctx pointers, which
 // is what the real port wants anyway.
 
@@ -423,7 +451,7 @@ type arena = struct {
 };
 
 // In-place init. Returning a 24-byte struct by value isn't yet
-// supported in 6c (SysV requires a hidden return-slot pointer for
+// supported in w6c (SysV requires a hidden return-slot pointer for
 // structs >16 bytes), so we initialize through a pointer like the
 // real compiler does today.
 fn arena_init(a: *arena, buf: *u8, cap: u64) void = {

selfhost/test/smoke.ww

@@ -12,7 +12,7 @@
 // indicating which probe broke. The 990_selfhost test asserts 42.
 //
 // Note: only stack-local mutable state. Top-level `let` mutation
-// requires a writable .data segment in 6l, which is a separate
+// requires a writable .data segment in w6l, which is a separate
 // task; until then we exercise polymorphism via ctx pointers, which
 // is what the real port wants anyway.
 
@@ -29,7 +29,7 @@ type arena = struct {
 };
 
 // In-place init. Returning a 24-byte struct by value isn't yet
-// supported in 6c (SysV requires a hidden return-slot pointer for
+// supported in w6c (SysV requires a hidden return-slot pointer for
 // structs >16 bytes), so we initialize through a pointer like the
 // real compiler does today.
 fn arena_init(a: *arena, buf: *u8, cap: u64) void = {

selfhost/test/uses.ww

@@ -3,7 +3,7 @@
 // `type NAME = TYPE;` (alias + struct), top-level `let NAME: TYPE = LIT;`.
 //
 // Function declarations are still recovered past — the body parser
-// is the next major chunk. See selfhost/cmd/wwc/parse.ww header.
+// is the next major chunk. See selfhost/cmd/wcc/parse.ww header.
 
 use os;
 use mem;

test/run

@@ -2,7 +2,7 @@
 # test/run — driver for `make test`. Plan 9 rc-flavoured but plain sh.
 #
 # Walks the test/ tree:
-#   test/wwc/<NNN>_<name>.c → out/bin/test_<name> binary, run it.
+#   test/wcc/<NNN>_<name>.c → out/bin/test_<name> binary, run it.
 #   test/lang/<phase>/*.ww  → compile/run via $WW, compare stdout/exit
 #                              with header comments (// expected: ...).
 # Exit non-zero on first failure.
@@ -16,7 +16,7 @@ fail=0
 ran=0
 
 # ---- C-side unit tests --------------------------------------------------
-for t in test/wwc/*.c; do
+for t in test/wcc/*.c; do
 	[ -f "$t" ] || continue
 	name=${t##*/}
 	name=${name%.c}

test/wcc/000_smoke.c

@@ -2,7 +2,7 @@
  * 000_smoke — Phase 0 smoke test.
  *
  * Asserts:
- *   - libwwc symbols (newarena/amalloc/freearena, fatal/errorf/warnf)
+ *   - libwcc symbols (newarena/amalloc/freearena, fatal/errorf/warnf)
  *     are linkable.
  *   - `ww -V` exits 0 and prints the configured version.
  */

test/wcc/400_w6c.c

@@ -22,7 +22,7 @@ run6c(const char *src, char **out)
 	char cmd[256];
 	const char *bin = getenv("BIN");
 	if (!bin) bin = "out/bin";
-	snprintf(cmd, sizeof cmd, "%s/6c %s 2>&1", bin, path);
+	snprintf(cmd, sizeof cmd, "%s/w6c %s 2>&1", bin, path);
 	FILE *p = popen(cmd, "r");
 	if (p == NULL) { unlink(path); return -1; }
 	size_t cap = 4096, n = 0;
@@ -72,7 +72,7 @@ main(void)
 		char *out = NULL;
 		int rc = run6c(rows[i].src, &out);
 		if (rc != 0) {
-			fprintf(stderr, "row %d: 6c rc=%d\n", i, rc);
+			fprintf(stderr, "row %d: w6c rc=%d\n", i, rc);
 			fail++;
 			free(out);
 			continue;
@@ -84,7 +84,7 @@ main(void)
 		}
 		free(out);
 	}
-	if (fail) { fprintf(stderr, "%d/%d 6c tests failed\n", fail, n); return 1; }
+	if (fail) { fprintf(stderr, "%d/%d w6c tests failed\n", fail, n); return 1; }
-	printf("6c: %d/%d ok\n", n, n);
+	printf("w6c: %d/%d ok\n", n, n);
 	return 0;
 }

test/wcc/500_w6a.c

@@ -1,6 +1,6 @@
 /*
- * 500_asm — assembler smoke. Drive 6c on a tiny program, feed the
+ * 500_asm — assembler smoke. Drive w6c on a tiny program, feed the
- * output to 6a, then read back the .o magic to confirm we produced
+ * output to w6a, then read back the .o magic to confirm we produced
  * a valid ELF64 relocatable object.
  */
 #include <stdio.h>
@@ -39,10 +39,10 @@ main(void)
 		fclose(f);
 
 		char cmd[512];
-		snprintf(cmd, sizeof cmd, "%s/6c -o %s %s", bin, asmf, src);
+		snprintf(cmd, sizeof cmd, "%s/w6c -o %s %s", bin, asmf, src);
-		if (run(cmd) != 0) { fprintf(stderr, "6c fail: %s\n", programs[i]); fail++; continue; }
+		if (run(cmd) != 0) { fprintf(stderr, "w6c fail: %s\n", programs[i]); fail++; continue; }
-		snprintf(cmd, sizeof cmd, "%s/6a -o %s %s", bin, obj, asmf);
+		snprintf(cmd, sizeof cmd, "%s/w6a -o %s %s", bin, obj, asmf);
-		if (run(cmd) != 0) { fprintf(stderr, "6a fail: %s\n", programs[i]); fail++; continue; }
+		if (run(cmd) != 0) { fprintf(stderr, "w6a fail: %s\n", programs[i]); fail++; continue; }
 
 		FILE *of = fopen(obj, "rb");
 		if (of == NULL) { fail++; continue; }
@@ -56,7 +56,7 @@ main(void)
 		}
 	}
 	unlink(src); unlink(asmf); unlink(obj);
-	if (fail) { fprintf(stderr, "%d/%d 6a tests failed\n", fail, n); return 1; }
+	if (fail) { fprintf(stderr, "%d/%d w6a tests failed\n", fail, n); return 1; }
-	printf("6a: %d/%d ok\n", n, n);
+	printf("w6a: %d/%d ok\n", n, n);
 	return 0;
 }

test/wcc/600_w6l.c

@@ -1,5 +1,5 @@
 /*
- * 600_6l — linker smoke. Drive 6c → 6a → 6l on a tiny program,
+ * 600_6l — linker smoke. Drive w6c → w6a → w6l on a tiny program,
  * confirm the result is a static ELF executable with no PT_INTERP.
  */
 #include <stdio.h>
@@ -24,12 +24,12 @@ main(void)
 	fclose(f);
 
 	char cmd[1024];
-	snprintf(cmd, sizeof cmd, "%s/6c -o %s %s", bin, asmf, src);
+	snprintf(cmd, sizeof cmd, "%s/w6c -o %s %s", bin, asmf, src);
-	if (system(cmd) != 0) { fprintf(stderr, "6c failed\n"); return 1; }
+	if (system(cmd) != 0) { fprintf(stderr, "w6c failed\n"); return 1; }
-	snprintf(cmd, sizeof cmd, "%s/6a -o %s %s", bin, obj, asmf);
+	snprintf(cmd, sizeof cmd, "%s/w6a -o %s %s", bin, obj, asmf);
-	if (system(cmd) != 0) { fprintf(stderr, "6a failed\n"); return 1; }
+	if (system(cmd) != 0) { fprintf(stderr, "w6a failed\n"); return 1; }
-	snprintf(cmd, sizeof cmd, "%s/6l -o %s %s", bin, exe, obj);
+	snprintf(cmd, sizeof cmd, "%s/w6l -o %s %s", bin, exe, obj);
-	if (system(cmd) != 0) { fprintf(stderr, "6l failed\n"); return 1; }
+	if (system(cmd) != 0) { fprintf(stderr, "w6l failed\n"); return 1; }
 
 	/* validate ELF magic + e_type=EXEC */
 	FILE *of = fopen(exe, "rb");
@@ -62,6 +62,6 @@ main(void)
 	}
 
 	unlink(src); unlink(asmf); unlink(obj); unlink(exe);
-	printf("6l: ok\n");
+	printf("w6l: ok\n");
 	return 0;
 }

test/wcc/610_arch.c

@@ -4,7 +4,7 @@
  * undefined external. Linking should pull only the needed member;
  * the other one's bad reference must NOT cause a link error.
  *
- * If 6l were still pulling all members, this test would fail with
+ * If w6l were still pulling all members, this test would fail with
  * "undefined reference to 'this_symbol_does_not_exist'".
  */
 #include <stdio.h>
@@ -56,11 +56,11 @@ main(void)
 
 	char cmd[2048];
 	snprintf(cmd, sizeof cmd,
-	    "set -e; cd %s && %s/6c -o lib_good.s lib_good.ww && "
+	    "set -e; cd %s && %s/w6c -o lib_good.s lib_good.ww && "
-	    "%s/6c -o lib_bad.s lib_bad.ww && "
+	    "%s/w6c -o lib_bad.s lib_bad.ww && "
-	    "%s/6a -o lib_good.o lib_good.s && %s/6a -o lib_bad.o lib_bad.s && "
+	    "%s/w6a -o lib_good.o lib_good.s && %s/w6a -o lib_bad.o lib_bad.s && "
 	    "ar rcs libfoo.a lib_good.o lib_bad.o && "
-	    "%s/6c -o m.s m.ww && %s/6a -o m.o m.s",
+	    "%s/w6c -o m.s m.ww && %s/w6a -o m.o m.s",
 	    dir, bin, bin, bin, bin, bin, bin);
 	if (run(cmd) != 0) { fprintf(stderr, "build failed\n"); return 1; }
 
@@ -69,7 +69,7 @@ main(void)
 	snprintf(startobj, sizeof startobj, "%s/../obj/rt/start.o", bin);
 
 	snprintf(cmd, sizeof cmd,
-	    "%s/6l -o %s/m %s/m.o %s %s/libfoo.a 2>%s/link.err",
+	    "%s/w6l -o %s/m %s/m.o %s %s/libfoo.a 2>%s/link.err",
 	    bin, dir, dir, startobj, dir, dir);
 	if (run(cmd) != 0) {
 		FILE *ef = fopen("/dev/null", "r");

test/wcc/800_ffi.c

@@ -22,7 +22,7 @@ run6c(const char *bin, const char *src)
 	fclose(f);
 
 	char cmd[512];
-	snprintf(cmd, sizeof cmd, "%s/6c %s 2>&1", bin, path);
+	snprintf(cmd, sizeof cmd, "%s/w6c %s 2>&1", bin, path);
 	FILE *p = popen(cmd, "r");
 	size_t cap = 4096, n = 0;
 	char *buf = malloc(cap);
@@ -66,10 +66,10 @@ main(void)
 		char path[256];
 		snprintf(path, sizeof path, "%s/../../lib/c/libc/libc.ww", bin);
 		char cmd[512];
-		snprintf(cmd, sizeof cmd, "%s/6c %s > /dev/null 2>&1", bin, path);
+		snprintf(cmd, sizeof cmd, "%s/w6c %s > /dev/null 2>&1", bin, path);
 		int rc = system(cmd);
 		if (rc != 0) {
-			fprintf(stderr, "ffi: 6c failed on libc.ww (rc=%d)\n", rc);
+			fprintf(stderr, "ffi: w6c failed on libc.ww (rc=%d)\n", rc);
 			fail++;
 		}
 	}

test/wcc/810_dyn.c

@@ -1,5 +1,5 @@
 /*
- * 810_dyn — end-to-end test of 6l's dynamic linker.
+ * 810_dyn — end-to-end test of w6l's dynamic linker.
  *
  * Drives `ww build -L /usr/lib -l c` over a small ww program that
  * binds libc symbols via @symbol, then runs the produced binary and

test/wcc/900_stdlib.c

@@ -51,7 +51,7 @@ main(void)
 	for (int i = 0; modules[i]; i++, n++) {
 		char path[1024], cmd[2048];
 		snprintf(path, sizeof path, "%s/%s", cwd, modules[i]);
-		snprintf(cmd, sizeof cmd, "%s/6c %s > /dev/null 2>&1",
+		snprintf(cmd, sizeof cmd, "%s/w6c %s > /dev/null 2>&1",
 		    bin, path);
 		int rc = system(cmd);
 		if (rc != 0) {

test/wcc/990_selfhost.c

@@ -2,7 +2,7 @@
  * 990_selfhost — phase-10 marker test. Three probes:
  *
  *  1. The selfhost stubs (mem.ww, err.ww) must parse, typecheck and
- *     codegen via C-side `6c`.
+ *     codegen via C-side `w6c`.
  *
  *  2. selfhost/test/smoke.ww — an actual ww program exercising the
  *     patterns the real port will use (bump arena, error union,
@@ -65,13 +65,13 @@ slurp(const char *path, char **outbuf, size_t *outlen)
 	return 0;
 }
 
-/* Probe 1: each file must compile through `6c`. */
+/* Probe 1: each file must compile through `w6c`. */
 static int
 probe_codegen(const char *bin)
 {
 	static const char *files[] = {
-		"selfhost/cmd/wwc/mem.ww",
+		"selfhost/cmd/wcc/mem.ww",
-		"selfhost/cmd/wwc/err.ww",
+		"selfhost/cmd/wcc/err.ww",
 		NULL,
 	};
 	char cwd[1024];
@@ -80,7 +80,7 @@ probe_codegen(const char *bin)
 	for (int i = 0; files[i]; i++) {
 		char cmd[2048];
 		snprintf(cmd, sizeof cmd,
-		    "%s/6c %s/%s > /dev/null 2>&1", bin, cwd, files[i]);
+		    "%s/w6c %s/%s > /dev/null 2>&1", bin, cwd, files[i]);
 		if (runwait(cmd) != 0) {
 			fprintf(stderr, "codegen FAIL: %s\n", files[i]);
 			fail++;
@@ -169,12 +169,12 @@ static int
 probe_dump_diff(const char *bin)
 {
 	const char *tok_inputs[] = {
-		"selfhost/cmd/wwc/mem.ww",
+		"selfhost/cmd/wcc/mem.ww",
-		"selfhost/cmd/wwc/err.ww",
+		"selfhost/cmd/wcc/err.ww",
-		"selfhost/cmd/wwc/lex.ww",
+		"selfhost/cmd/wcc/lex.ww",
-		"selfhost/cmd/wwc/tok.ww",
+		"selfhost/cmd/wcc/tok.ww",
-		"selfhost/cmd/wwc/ast.ww",
+		"selfhost/cmd/wcc/ast.ww",
-		"selfhost/cmd/wwc/parse.ww",
+		"selfhost/cmd/wcc/parse.ww",
 		"selfhost/cmd/wwdump/main.ww",
 		"selfhost/test/smoke.ww",
 		NULL,
@@ -186,16 +186,16 @@ probe_dump_diff(const char *bin)
 	 * against the C parser on every selfhost file plus the stdlib. */
 	const char *ast_inputs[] = {
 		"selfhost/test/uses.ww",
-		"selfhost/cmd/wwc/err.ww",
+		"selfhost/cmd/wcc/err.ww",
-		"selfhost/cmd/wwc/mem.ww",
+		"selfhost/cmd/wcc/mem.ww",
-		"selfhost/cmd/wwc/lex.ww",
+		"selfhost/cmd/wcc/lex.ww",
-		"selfhost/cmd/wwc/tok.ww",
+		"selfhost/cmd/wcc/tok.ww",
-		"selfhost/cmd/wwc/ast.ww",
+		"selfhost/cmd/wcc/ast.ww",
-		"selfhost/cmd/wwc/parse.ww",
+		"selfhost/cmd/wcc/parse.ww",
-		"selfhost/cmd/wwc/typ.ww",
+		"selfhost/cmd/wcc/typ.ww",
-		"selfhost/cmd/wwc/sym.ww",
+		"selfhost/cmd/wcc/sym.ww",
-		"selfhost/cmd/wwc/check.ww",
+		"selfhost/cmd/wcc/check.ww",
-		"selfhost/cmd/wwc/cgen.ww",
+		"selfhost/cmd/wcc/cgen.ww",
 		"selfhost/cmd/wwdump/main.ww",
 		"selfhost/test/smoke.ww",
 		"lib/strconv/strconv.ww",
@@ -226,7 +226,7 @@ probe_dump_diff(const char *bin)
 }
 
 /* Probe 5: ww-side cgen (wwdump_ww -c) emits Plan 9 amd64 asm. For
- * each fixture we (a) diff the ww asm against C-side 6c and (b)
+ * each fixture we (a) diff the ww asm against C-side w6c and (b)
  * assemble + link + run the ww output and compare exit codes. Both
  * must succeed. The cgen port handles literals, +/-/star/slash,
  * compound assignment, idents, calls, if/else, for loops, and
@@ -349,7 +349,7 @@ probe_ww_compile(const char *bin)
 		/* Chained N_DOT: o.ptr_to_inner.val (read field through a
 		 * pointer-to-struct field). Pre-fix the cgen fell through
 		 * silently and returned the inner pointer instead of the
-		 * dereferenced field. Surfaced porting 6l/pass.ww. */
+		 * dereferenced field. Surfaced porting w6l/pass.ww. */
 		{ "@symbol(\"rt_alloc\") fn rt_alloc(n: u64) *void;\n"
 		  "type inner = struct { val: u64 };\n"
 		  "type outer = struct { p: *inner };\n"
@@ -384,7 +384,7 @@ probe_ww_compile(const char *bin)
 			fprintf(stderr, "ww-compile prog %d: wwdump_ww -c errored\n", i);
 			fail++; goto cleanup;
 		}
-		snprintf(cmd, sizeof cmd, "%s/6c %s > %s 2>/dev/null", bin, src, cs);
+		snprintf(cmd, sizeof cmd, "%s/w6c %s > %s 2>/dev/null", bin, src, cs);
 		runwait(cmd);
 
 		char *bw = NULL, *bc = NULL;
@@ -398,15 +398,15 @@ probe_ww_compile(const char *bin)
 		}
 		free(bw); free(bc);
 
-		snprintf(cmd, sizeof cmd, "%s/6a -o %s %s 2>/dev/null", bin, obj, wws);
+		snprintf(cmd, sizeof cmd, "%s/w6a -o %s %s 2>/dev/null", bin, obj, wws);
 		if (runwait(cmd) != 0) {
-			fprintf(stderr, "ww-compile prog %d: 6a failed\n", i);
+			fprintf(stderr, "ww-compile prog %d: w6a failed\n", i);
 			fail++; goto cleanup;
 		}
-		snprintf(cmd, sizeof cmd, "%s/6l -o %s %s %s 2>/dev/null",
+		snprintf(cmd, sizeof cmd, "%s/w6l -o %s %s %s 2>/dev/null",
 		    bin, exe, obj, rt);
 		if (runwait(cmd) != 0) {
-			fprintf(stderr, "ww-compile prog %d: 6l failed\n", i);
+			fprintf(stderr, "ww-compile prog %d: w6l failed\n", i);
 			fail++; goto cleanup;
 		}
 		int rc = runwait(exe);
@@ -433,9 +433,9 @@ probe_resolve(const char *bin)
 	char cwd[1024];
 	if (getcwd(cwd, sizeof cwd) == NULL) return -1;
 	const char *complete[] = {
-		"selfhost/cmd/wwc/err.ww",
+		"selfhost/cmd/wcc/err.ww",
-		"selfhost/cmd/wwc/mem.ww",
+		"selfhost/cmd/wcc/mem.ww",
-		"selfhost/cmd/wwc/tok.ww",
+		"selfhost/cmd/wcc/tok.ww",
 		"selfhost/test/smoke.ww",
 		NULL,
 	};
@@ -463,8 +463,8 @@ probe_dump_stable(const char *bin)
 	char cwd[1024];
 	if (getcwd(cwd, sizeof cwd) == NULL) return -1;
 	const char *inputs[] = {
-		"selfhost/cmd/wwc/mem.ww",
+		"selfhost/cmd/wcc/mem.ww",
-		"selfhost/cmd/wwc/err.ww",
+		"selfhost/cmd/wcc/err.ww",
 		"selfhost/test/smoke.ww",
 		NULL,
 	};
@@ -540,19 +540,19 @@ probe_bootstrap_fixed_point(const char *bin)
 	    "%s/wwdump_ww -c %s/selfhost/cmd/wwdump/main.combined.ww > %s 2>/dev/null",
 	    bin, cwd, ww2s);
 	if (runwait(cmd) != 0) { fprintf(stderr, "fp FAIL: ww1 self-compile\n"); fail++; goto cleanup; }
-	snprintf(cmd, sizeof cmd, "%s/6a -o %s %s 2>/dev/null", bin, ww2o, ww2s);
+	snprintf(cmd, sizeof cmd, "%s/w6a -o %s %s 2>/dev/null", bin, ww2o, ww2s);
-	if (runwait(cmd) != 0) { fprintf(stderr, "fp FAIL: 6a ww2.s\n"); fail++; goto cleanup; }
+	if (runwait(cmd) != 0) { fprintf(stderr, "fp FAIL: w6a ww2.s\n"); fail++; goto cleanup; }
-	snprintf(cmd, sizeof cmd, "%s/6l -o %s %s %s 2>/dev/null", bin, ww2e, ww2o, rt);
+	snprintf(cmd, sizeof cmd, "%s/w6l -o %s %s %s 2>/dev/null", bin, ww2e, ww2o, rt);
-	if (runwait(cmd) != 0) { fprintf(stderr, "fp FAIL: 6l ww2\n"); fail++; goto cleanup; }
+	if (runwait(cmd) != 0) { fprintf(stderr, "fp FAIL: w6l ww2\n"); fail++; goto cleanup; }
 	/* ww2 -> ww3 */
 	snprintf(cmd, sizeof cmd,
 	    "%s -c %s/selfhost/cmd/wwdump/main.combined.ww > %s 2>/dev/null",
 	    ww2e, cwd, ww3s);
 	if (runwait(cmd) != 0) { fprintf(stderr, "fp FAIL: ww2 self-compile\n"); fail++; goto cleanup; }
-	snprintf(cmd, sizeof cmd, "%s/6a -o %s %s 2>/dev/null", bin, ww3o, ww3s);
+	snprintf(cmd, sizeof cmd, "%s/w6a -o %s %s 2>/dev/null", bin, ww3o, ww3s);
-	if (runwait(cmd) != 0) { fprintf(stderr, "fp FAIL: 6a ww3.s\n"); fail++; goto cleanup; }
+	if (runwait(cmd) != 0) { fprintf(stderr, "fp FAIL: w6a ww3.s\n"); fail++; goto cleanup; }
-	snprintf(cmd, sizeof cmd, "%s/6l -o %s %s %s 2>/dev/null", bin, ww3e, ww3o, rt);
+	snprintf(cmd, sizeof cmd, "%s/w6l -o %s %s %s 2>/dev/null", bin, ww3e, ww3o, rt);
-	if (runwait(cmd) != 0) { fprintf(stderr, "fp FAIL: 6l ww3\n"); fail++; goto cleanup; }
+	if (runwait(cmd) != 0) { fprintf(stderr, "fp FAIL: w6l ww3\n"); fail++; goto cleanup; }
 	/* The fixed-point check: ww2.s == ww3.s, ww2 == ww3. */
 	snprintf(cmd, sizeof cmd, "cmp -s %s %s", ww2s, ww3s);
 	if (runwait(cmd) != 0) { fprintf(stderr, "fp FAIL: ww2.s != ww3.s (no fixed point)\n"); fail++; }
@@ -566,7 +566,7 @@ cleanup:
 
 /* Probe 8: ww1 → ww2 ladder. wwdump_ww (= ww1, built by C tools)
  * compiles its own concatenated source. The output assembles + links
- * via 6a/6l into ww2 (a fresh ww-built compiler binary). Confirms
+ * via w6a/w6l into ww2 (a fresh ww-built compiler binary). Confirms
  * the full ww-cgen pipeline is functionally correct end-to-end on
  * the entire frontend (lex+parse+check+cgen+ast+typ+sym+mem+err+
  * driver). Pre-fix-set this segfaulted at 5919 lines of asm; post-
@@ -592,18 +592,18 @@ probe_ww1_to_ww2(const char *bin)
 		fail++;
 		goto cleanup;
 	}
-	snprintf(cmd, sizeof cmd, "%s/6a -o %s %s 2>/dev/null", bin, obj_p, asm_p);
+	snprintf(cmd, sizeof cmd, "%s/w6a -o %s %s 2>/dev/null", bin, obj_p, asm_p);
 	if (runwait(cmd) != 0) {
-		fprintf(stderr, "ww1->ww2 FAIL: 6a errored on ww1 output\n");
+		fprintf(stderr, "ww1->ww2 FAIL: w6a errored on ww1 output\n");
 		fail++;
 		goto cleanup;
 	}
 	char rt[1024];
 	snprintf(rt, sizeof rt, "%s/../lib/libwwrt.a", bin);
-	snprintf(cmd, sizeof cmd, "%s/6l -o %s %s %s 2>/dev/null",
+	snprintf(cmd, sizeof cmd, "%s/w6l -o %s %s %s 2>/dev/null",
 	    bin, exe_p, obj_p, rt);
 	if (runwait(cmd) != 0) {
-		fprintf(stderr, "ww1->ww2 FAIL: 6l errored\n");
+		fprintf(stderr, "ww1->ww2 FAIL: w6l errored\n");
 		fail++;
 		goto cleanup;
 	}
@@ -619,8 +619,8 @@ cleanup:
 }
 
 /* Probe 7: end-to-end via wwdump_ww. Use `ww build` to produce the
- * concatenated source as a side effect, then drive ww-cgen → 6a →
+ * concatenated source as a side effect, then drive ww-cgen → w6a →
- * 6l → run, comparing the binary's exit code to the fixture's
+ * w6l → run, comparing the binary's exit code to the fixture's
  * declared expectation. This is the bootstrap-grade signal: it
  * doesn't require ww-cgen output to be byte-identical to C-cgen,
  * only to be functionally correct. The byte-match probe above is
@@ -656,7 +656,7 @@ probe_ww_links(const char *bin)
 		runwait(cmd);
 		/* ww build to get the .combined.ww as a side effect. */
 		snprintf(cmd, sizeof cmd,
-		    "cd %s && %s/ww build -I %s/selfhost/cmd/wwc %s >/dev/null 2>&1",
+		    "cd %s && %s/ww build -I %s/selfhost/cmd/wcc %s >/dev/null 2>&1",
 		    tmpdir, bin, cwd, tmpsrc);
 		if (runwait(cmd) != 0) {
 			fprintf(stderr, "ww-links FAIL: ww build %s\n", fix);
@@ -676,19 +676,19 @@ probe_ww_links(const char *bin)
 			fail++;
 			goto cleanup;
 		}
-		snprintf(cmd, sizeof cmd, "%s/6a -o %s %s 2>/dev/null",
+		snprintf(cmd, sizeof cmd, "%s/w6a -o %s %s 2>/dev/null",
 		    bin, wop, wsp);
 		if (runwait(cmd) != 0) {
-			fprintf(stderr, "ww-links FAIL: 6a %s\n", fix);
+			fprintf(stderr, "ww-links FAIL: w6a %s\n", fix);
 			fail++;
 			goto cleanup;
 		}
 		char rt[1024];
 		snprintf(rt, sizeof rt, "%s/../lib/libwwrt.a", bin);
-		snprintf(cmd, sizeof cmd, "%s/6l -o %s %s %s 2>/dev/null",
+		snprintf(cmd, sizeof cmd, "%s/w6l -o %s %s %s 2>/dev/null",
 		    bin, wexep, wop, rt);
 		if (runwait(cmd) != 0) {
-			fprintf(stderr, "ww-links FAIL: 6l %s\n", fix);
+			fprintf(stderr, "ww-links FAIL: w6l %s\n", fix);
 			fail++;
 			goto cleanup;
 		}
@@ -708,16 +708,16 @@ cleanup:
 }
 
 /* Probe 6: ww-cgen byte-matches C-cgen on every selfhost file that
- * raw 6c can compile in isolation (no driver concatenation). The list
+ * raw w6c can compile in isolation (no driver concatenation). The list
  * is the convergence set: when this stays empty, the cmp ww2 ww3
  * ceiling becomes feasible. */
 static int
 probe_cgen_match(const char *bin)
 {
 	const char *files[] = {
-		"selfhost/cmd/wwc/mem.ww",
+		"selfhost/cmd/wcc/mem.ww",
-		"selfhost/cmd/wwc/err.ww",
+		"selfhost/cmd/wcc/err.ww",
-		"selfhost/cmd/wwc/tok.ww",
+		"selfhost/cmd/wcc/tok.ww",
 		"selfhost/test/smoke.ww",
 		NULL,
 	};
@@ -728,7 +728,7 @@ probe_cgen_match(const char *bin)
 		char a[256], b[256], cmd[2048];
 		snprintf(a, sizeof a, "/tmp/wwd_cm_%d_c", getpid());
 		snprintf(b, sizeof b, "/tmp/wwd_cm_%d_w", getpid());
-		snprintf(cmd, sizeof cmd, "%s/6c %s/%s > %s 2>/dev/null",
+		snprintf(cmd, sizeof cmd, "%s/w6c %s/%s > %s 2>/dev/null",
 		    bin, cwd, files[i], a);
 		runwait(cmd);
 		snprintf(cmd, sizeof cmd, "%s/wwdump_ww -c %s/%s > %s 2>/dev/null",

test/wcc/991_w6a_ww.c

@@ -1,15 +1,15 @@
 /*
- * 991_6a_ww — phase-10 marker for the ww-side 6a port.
+ * 991_w6a_ww — phase-10 marker for the ww-side w6a port.
  *
- * Diffs the C-built `6a` against the ww-built `6a_ww` on a corpus of
+ * Diffs the C-built `w6a` against the ww-built `w6a_ww` on a corpus of
  * .s files. Both must produce byte-identical ELF .o output. The corpus
  * spans:
  *   - rt/X.s              hand-written runtime; small, varied operands
  *   - generated .s        from the existing selfhost cgen pipeline
- *                         (wwdump/6a/6l main.s) - large, exercises
+ *                         (wwdump/w6a/w6l main.s) - large, exercises
- *                         every encoding path 6c emits
+ *                         every encoding path w6c emits
  *
- * Any divergence is a port bug in selfhost/cmd/6a/.
+ * Any divergence is a port bug in selfhost/cmd/w6a/.
  */
 #include <stdio.h>
 #include <stdlib.h>
@@ -65,15 +65,15 @@ diff_one(const char *bin, const char *src)
 	snprintf(co, sizeof co, "/tmp/wwa_%d_c.o", getpid());
 	snprintf(wo, sizeof wo, "/tmp/wwa_%d_w.o", getpid());
 
-	snprintf(cmd, sizeof cmd, "%s/6a -o %s %s 2>/dev/null", bin, co, src);
+	snprintf(cmd, sizeof cmd, "%s/w6a -o %s %s 2>/dev/null", bin, co, src);
 	if (runwait(cmd) != 0) {
-		fprintf(stderr, "6a_ww FAIL: C 6a errored on %s\n", src);
+		fprintf(stderr, "w6a_ww FAIL: C w6a errored on %s\n", src);
 		unlink(co);
 		return -1;
 	}
-	snprintf(cmd, sizeof cmd, "%s/6a_ww -o %s %s 2>/dev/null", bin, wo, src);
+	snprintf(cmd, sizeof cmd, "%s/w6a_ww -o %s %s 2>/dev/null", bin, wo, src);
 	if (runwait(cmd) != 0) {
-		fprintf(stderr, "6a_ww FAIL: ww 6a errored on %s\n", src);
+		fprintf(stderr, "w6a_ww FAIL: ww w6a errored on %s\n", src);
 		unlink(co); unlink(wo);
 		return -1;
 	}
@@ -81,10 +81,10 @@ diff_one(const char *bin, const char *src)
 	size_t nc = 0, nw = 0;
 	int rc = 0;
 	if (slurp(co, &bc, &nc) < 0 || slurp(wo, &bw, &nw) < 0) {
-		fprintf(stderr, "6a_ww FAIL: cannot read .o for %s\n", src);
+		fprintf(stderr, "w6a_ww FAIL: cannot read .o for %s\n", src);
 		rc = -1;
 	} else if (nc != nw || memcmp(bc, bw, nc) != 0) {
-		fprintf(stderr, "6a_ww FAIL: %s — C %zu vs ww %zu bytes\n",
+		fprintf(stderr, "w6a_ww FAIL: %s — C %zu vs ww %zu bytes\n",
 		    src, nc, nw);
 		rc = -1;
 	}
@@ -110,11 +110,11 @@ main(void)
 		"rt/alloc.s",
 		"rt/streq.s",
 		/* generated .s from the existing selfhost stack — large,
-		 * exercises every encoding 6c emits (the only way to hit
+		 * exercises every encoding w6c emits (the only way to hit
 		 * the long tail of operand shapes). */
 		"selfhost/cmd/wwdump/main.s",
-		"selfhost/cmd/6l/main.s",
+		"selfhost/cmd/w6l/main.s",
-		"selfhost/cmd/6a/main.s",
+		"selfhost/cmd/w6a/main.s",
 		NULL,
 	};
 	int fail = 0;
@@ -126,10 +126,10 @@ main(void)
 		n++;
 	}
 	if (fail) {
-		fprintf(stderr, "6a_ww: %d/%d diff(s) failed\n", fail, n);
+		fprintf(stderr, "w6a_ww: %d/%d diff(s) failed\n", fail, n);
 		return 1;
 	}
-	printf("6a_ww: byte-identical to C 6a on %d corpus files "
+	printf("w6a_ww: byte-identical to C w6a on %d corpus files "
 	    "(rt/*.s + selfhost generated main.s)\n", n);
 	return 0;
 }

test/wcc/992_w6l_ww.c

@@ -1,13 +1,13 @@
 /*
- * 992_6l_ww — phase-10 marker for the ww-side 6l port.
+ * 992_w6l_ww — phase-10 marker for the ww-side w6l port.
  *
- * Diffs the C-built `6l` against the ww-built `6l_ww` on a corpus of
+ * Diffs the C-built `w6l` against the ww-built `w6l_ww` on a corpus of
  * link inputs. Both must produce byte-identical static ELF binaries.
  * The corpus mixes:
  *   - a single .o input (no archive resolution)
  *   - a .o + libwwrt.a link, exercising the SysV `ar` two-pass loader
  *
- * Any divergence is a port bug in selfhost/cmd/6l/.
+ * Any divergence is a port bug in selfhost/cmd/w6l/.
  */
 #include <stdio.h>
 #include <stdlib.h>
@@ -65,15 +65,15 @@ diff_one(const char *bin, const char *label, const char *inputs)
 	snprintf(co, sizeof co, "/tmp/wwl_%d_c", getpid());
 	snprintf(wo, sizeof wo, "/tmp/wwl_%d_w", getpid());
 
-	snprintf(cmd, sizeof cmd, "%s/6l -o %s %s 2>/dev/null", bin, co, inputs);
+	snprintf(cmd, sizeof cmd, "%s/w6l -o %s %s 2>/dev/null", bin, co, inputs);
 	if (runwait(cmd) != 0) {
-		fprintf(stderr, "6l_ww FAIL: C 6l errored on %s\n", label);
+		fprintf(stderr, "w6l_ww FAIL: C w6l errored on %s\n", label);
 		unlink(co);
 		return -1;
 	}
-	snprintf(cmd, sizeof cmd, "%s/6l_ww -o %s %s 2>/dev/null", bin, wo, inputs);
+	snprintf(cmd, sizeof cmd, "%s/w6l_ww -o %s %s 2>/dev/null", bin, wo, inputs);
 	if (runwait(cmd) != 0) {
-		fprintf(stderr, "6l_ww FAIL: ww 6l errored on %s\n", label);
+		fprintf(stderr, "w6l_ww FAIL: ww w6l errored on %s\n", label);
 		unlink(co); unlink(wo);
 		return -1;
 	}
@@ -81,10 +81,10 @@ diff_one(const char *bin, const char *label, const char *inputs)
 	size_t nc = 0, nw = 0;
 	int rc = 0;
 	if (slurp(co, &bc, &nc) < 0 || slurp(wo, &bw, &nw) < 0) {
-		fprintf(stderr, "6l_ww FAIL: cannot read output for %s\n", label);
+		fprintf(stderr, "w6l_ww FAIL: cannot read output for %s\n", label);
 		rc = -1;
 	} else if (nc != nw || memcmp(bc, bw, nc) != 0) {
-		fprintf(stderr, "6l_ww FAIL: %s — C %zu vs ww %zu bytes\n",
+		fprintf(stderr, "w6l_ww FAIL: %s — C %zu vs ww %zu bytes\n",
 		    label, nc, nw);
 		rc = -1;
 	}
@@ -112,10 +112,10 @@ main(void)
 		 * are pulled from libwwrt.a as undefs are encountered). */
 		{ "wwdump+libwwrt",
 		  "%s/selfhost/cmd/wwdump/main.o %s/out/lib/libwwrt.a" },
-		{ "6a+libwwrt",
+		{ "w6a+libwwrt",
-		  "%s/selfhost/cmd/6a/main.o %s/out/lib/libwwrt.a" },
+		  "%s/selfhost/cmd/w6a/main.o %s/out/lib/libwwrt.a" },
-		{ "6l+libwwrt",
+		{ "w6l+libwwrt",
-		  "%s/selfhost/cmd/6l/main.o %s/out/lib/libwwrt.a" },
+		  "%s/selfhost/cmd/w6l/main.o %s/out/lib/libwwrt.a" },
 		{ NULL, NULL },
 	};
 
@@ -128,10 +128,10 @@ main(void)
 		n++;
 	}
 	if (fail) {
-		fprintf(stderr, "6l_ww: %d/%d diff(s) failed\n", fail, n);
+		fprintf(stderr, "w6l_ww: %d/%d diff(s) failed\n", fail, n);
 		return 1;
 	}
-	printf("6l_ww: byte-identical to C 6l on %d corpus links "
+	printf("w6l_ww: byte-identical to C w6l on %d corpus links "
 	    "(.o + libwwrt.a archive resolution)\n", n);
 	return 0;
 }

test/wcc/993_ww_ww.c

@@ -2,7 +2,7 @@
  * 993_ww_ww — phase-10 marker for the ww-side driver port.
  *
  * Diffs the C-built `ww` against the ww-built `ww_ww`. Both drivers
- * orchestrate the same 6c/6a/6l, so the resulting binaries must be
+ * orchestrate the same w6c/w6a/w6l, so the resulting binaries must be
  * byte-identical for every program in the corpus. The corpus mixes:
  *   - a tiny single-file program (no -I flags)
  *   - a multi-import build (selfhost/cmd/wwdump/main.ww), exercising
@@ -152,7 +152,7 @@ main(void)
 	 * regardless of the per-driver workdir. */
 	static char wwdump_src[2048], wwdump_inc_a[2048], wwdump_inc_b[2048];
 	snprintf(wwdump_src,   sizeof wwdump_src,   "%s/selfhost/cmd/wwdump/main.ww", cwd);
-	snprintf(wwdump_inc_a, sizeof wwdump_inc_a, "%s/selfhost/cmd/wwc", cwd);
+	snprintf(wwdump_inc_a, sizeof wwdump_inc_a, "%s/selfhost/cmd/wcc", cwd);
 	wwdump_inc_b[0] = '\0';
 	cases[1].src   = wwdump_src;
 	cases[1].inc_a = wwdump_inc_a;

test/wcc/994_w6c_ww.c

@@ -1,13 +1,13 @@
 /*
- * 994_6c_ww — phase-10 marker for the ww-side 6c port.
+ * 994_w6c_ww — phase-10 marker for the ww-side w6c port.
  *
- * 6c_ww is a thin packaging of selfhost/cmd/wwc/cgen.ww: it slurps a
+ * w6c_ww is a thin packaging of selfhost/cmd/wcc/cgen.ww: it slurps a
  * .ww file, runs lex+parse+cgen, and writes Plan 9 amd64 asm to the
  * file given by -o. The same cgen is reached through `wwdump_ww -c`,
- * so 6c_ww must produce byte-identical output to wwdump_ww -c on
+ * so w6c_ww must produce byte-identical output to wwdump_ww -c on
  * every program — this test pins that.
  *
- * (We do not diff against C-side `6c` here because the C compiler has
+ * (We do not diff against C-side `w6c` here because the C compiler has
  * features the ww cgen has not yet ported — float compare, fn-address
  * @symbol, indirect call. Test 990 probe 5 covers the C-vs-ww diff on
  * the subset that the ww cgen handles today.)
@@ -69,13 +69,13 @@ diff_one(const char *bin, const char *label, const char *src)
 	snprintf(cmd, sizeof cmd, "%s/wwdump_ww -c %s > %s 2>/dev/null",
 	    bin, src, ws);
 	if (runwait(cmd) != 0) {
-		fprintf(stderr, "6c_ww FAIL: wwdump_ww -c errored on %s\n", label);
+		fprintf(stderr, "w6c_ww FAIL: wwdump_ww -c errored on %s\n", label);
 		unlink(ws);
 		return -1;
 	}
-	snprintf(cmd, sizeof cmd, "%s/6c_ww -o %s %s 2>/dev/null", bin, cs, src);
+	snprintf(cmd, sizeof cmd, "%s/w6c_ww -o %s %s 2>/dev/null", bin, cs, src);
 	if (runwait(cmd) != 0) {
-		fprintf(stderr, "6c_ww FAIL: 6c_ww errored on %s\n", label);
+		fprintf(stderr, "w6c_ww FAIL: w6c_ww errored on %s\n", label);
 		unlink(ws); unlink(cs);
 		return -1;
 	}
@@ -83,10 +83,10 @@ diff_one(const char *bin, const char *label, const char *src)
 	size_t nw = 0, nc = 0;
 	int rc = 0;
 	if (slurp(ws, &bw, &nw) < 0 || slurp(cs, &bc, &nc) < 0) {
-		fprintf(stderr, "6c_ww FAIL: cannot read .s for %s\n", label);
+		fprintf(stderr, "w6c_ww FAIL: cannot read .s for %s\n", label);
 		rc = -1;
 	} else if (nw != nc || memcmp(bw, bc, nw) != 0) {
-		fprintf(stderr, "6c_ww FAIL: %s — wwdump_ww %zu vs 6c_ww %zu bytes\n",
+		fprintf(stderr, "w6c_ww FAIL: %s — wwdump_ww %zu vs w6c_ww %zu bytes\n",
 		    label, nw, nc);
 		rc = -1;
 	}
@@ -115,7 +115,7 @@ main(void)
 
 	/* In-source corpus: programs the ww-side cgen handles today.
 	 * Mirrors probe 5 in 990_selfhost without the parts that drift
-	 * against C 6c. */
+	 * against C w6c. */
 	struct { const char *label; const char *src; } progs[] = {
 		{ "ret42",
 		  "fn main() i32 = { return 42; };" },
@@ -147,12 +147,12 @@ main(void)
 	};
 
 	/* Source-tree corpus: the same .combined.ww files the bootstrap
-	 * fixed point chews on. Confirms 6c_ww handles realistic inputs,
+	 * fixed point chews on. Confirms w6c_ww handles realistic inputs,
 	 * not just hand-tailored ones. */
 	const char *combined_rel[] = {
 		"selfhost/cmd/wwdump/main.combined.ww",
-		"selfhost/cmd/6a/main.combined.ww",
+		"selfhost/cmd/w6a/main.combined.ww",
-		"selfhost/cmd/6l/main.combined.ww",
+		"selfhost/cmd/w6l/main.combined.ww",
 		"selfhost/cmd/ww/main.combined.ww",
 		NULL,
 	};
@@ -175,10 +175,10 @@ main(void)
 	}
 
 	if (fail) {
-		fprintf(stderr, "6c_ww: %d/%d diff(s) failed\n", fail, n);
+		fprintf(stderr, "w6c_ww: %d/%d diff(s) failed\n", fail, n);
 		return 1;
 	}
-	printf("6c_ww: byte-identical to wwdump_ww -c on %d corpus inputs "
+	printf("w6c_ww: byte-identical to wwdump_ww -c on %d corpus inputs "
 	    "(in-source + selfhost combined.ww)\n", n);
 	return 0;
 }

test/wcc/995_self_rebuild.c

@@ -1,7 +1,7 @@
 /*
  * 995_self_rebuild — the wwstage rebuilds itself.
  *
- * Drives ww_ww (the ww-side driver, which shells to 6c_ww/6a_ww/6l_ww)
+ * Drives ww_ww (the ww-side driver, which shells to w6c_ww/w6a_ww/w6l_ww)
  * over each wwstage tool's source and diffs the result byte-for-byte
  * against the cstage-built binary in $BIN. A green run means the
  * toolchain can recompile itself without touching cc, modulo the
@@ -59,9 +59,9 @@ slurp_eq(const char *a, const char *b)
 	return rc;
 }
 
-/* Each tool builds via `ww_ww build -I <local> -I selfhost/cmd/wwc src`.
+/* Each tool builds via `ww_ww build -I <local> -I selfhost/cmd/wcc src`.
- * Some tools have a local module dir (6a, 6l with sibling .ww files);
+ * Some tools have a local module dir (w6a, w6l with sibling .ww files);
- * wwc-only tools (6c, ww, wwdump) just need the wwc -I. inc_local is
+ * wwc-only tools (w6c, ww, wwdump) just need the wwc -I. inc_local is
  * "" for those.
  */
 static int
@@ -76,12 +76,12 @@ rebuild_one(const char *bin, const char *cwd, const char *tool,
 
 	if (inc_local && inc_local[0]) {
 		snprintf(cmd, sizeof cmd,
-		    "cd %s && %s/ww_ww build -I %s/%s -I %s/selfhost/cmd/wwc "
+		    "cd %s && %s/ww_ww build -I %s/%s -I %s/selfhost/cmd/wcc "
 		    "%s/%s >/dev/null 2>&1",
 		    workdir, bin, cwd, inc_local, cwd, cwd, src_rel);
 	} else {
 		snprintf(cmd, sizeof cmd,
-		    "cd %s && %s/ww_ww build -I %s/selfhost/cmd/wwc "
+		    "cd %s && %s/ww_ww build -I %s/selfhost/cmd/wcc "
 		    "%s/%s >/dev/null 2>&1",
 		    workdir, bin, cwd, cwd, src_rel);
 	}
@@ -121,9 +121,9 @@ main(void)
 		const char *src;
 		const char *inc_local;
 	} tools[] = {
-		{ "6c",     "selfhost/cmd/6c/main.ww",     "" },
+		{ "w6c",     "selfhost/cmd/w6c/main.ww",     "" },
-		{ "6a",     "selfhost/cmd/6a/main.ww",     "selfhost/cmd/6a" },
+		{ "w6a",     "selfhost/cmd/w6a/main.ww",     "selfhost/cmd/w6a" },
-		{ "6l",     "selfhost/cmd/6l/main.ww",     "selfhost/cmd/6l" },
+		{ "w6l",     "selfhost/cmd/w6l/main.ww",     "selfhost/cmd/w6l" },
 		{ "ww",     "selfhost/cmd/ww/main.ww",     "" },
 		{ "wwdump", "selfhost/cmd/wwdump/main.ww", "" },
 		{ NULL, NULL, NULL },
@@ -141,6 +141,6 @@ main(void)
 		return 1;
 	}
 	printf("self-rebuild: %d wwstage tool(s) round-trip byte-identical "
-	    "through ww_ww + 6c_ww + 6a_ww + 6l_ww\n", n);
+	    "through ww_ww + w6c_ww + w6a_ww + w6l_ww\n", n);
 	return 0;
 }

test/wcc/996_dyn_ww.c

@@ -1,8 +1,8 @@
 /*
  * 996_dyn_ww — phase-8 marker for ET_DYN linking on the ww side.
  *
- * Drives 6l_ww with -L/-l flags over examples/snake/snake.o and diffs
+ * Drives w6l_ww with -L/-l flags over examples/snake/snake.o and diffs
- * the result against the C-built 6l on the same inputs. A green run
+ * the result against the C-built w6l on the same inputs. A green run
  * means the ww-side linker emits PT_INTERP/PT_DYNAMIC binaries byte-
  * for-byte identical to the C linker — i.e. the dynamic linking story
  * is fully ported and snake no longer depends on Cstage.
@@ -71,7 +71,7 @@ main(void)
 	    "-l ncurses -l c >/dev/null 2>&1",
 	    cwd, bin);
 	if (runwait(cmd) != 0) {
-		fprintf(stderr, "6l_ww-dyn FAIL: cannot build snake.o via C driver\n");
+		fprintf(stderr, "w6l_ww-dyn FAIL: cannot build snake.o via C driver\n");
 		return 1;
 	}
 
@@ -79,24 +79,24 @@ main(void)
 	snprintf(co, sizeof co, "/tmp/wwld_%d_c", getpid());
 	snprintf(wo, sizeof wo, "/tmp/wwld_%d_w", getpid());
 
-	/* C-side 6l with the dynamic flags. */
+	/* C-side w6l with the dynamic flags. */
 	snprintf(cmd, sizeof cmd,
-	    "%s/6l -o %s %s/examples/snake/snake.o -L /usr/lib "
+	    "%s/w6l -o %s %s/examples/snake/snake.o -L /usr/lib "
 	    "-l ncurses -l c %s/out/lib/libwwrt.a 2>/dev/null",
 	    bin, co, cwd, cwd);
 	if (runwait(cmd) != 0) {
-		fprintf(stderr, "6l_ww-dyn FAIL: C 6l errored\n");
+		fprintf(stderr, "w6l_ww-dyn FAIL: C w6l errored\n");
 		unlink(co);
 		return 1;
 	}
 
-	/* ww-side 6l with the same flags. */
+	/* ww-side w6l with the same flags. */
 	snprintf(cmd, sizeof cmd,
-	    "%s/6l_ww -o %s %s/examples/snake/snake.o -L /usr/lib "
+	    "%s/w6l_ww -o %s %s/examples/snake/snake.o -L /usr/lib "
 	    "-l ncurses -l c %s/out/lib/libwwrt.a 2>/dev/null",
 	    bin, wo, cwd, cwd);
 	if (runwait(cmd) != 0) {
-		fprintf(stderr, "6l_ww-dyn FAIL: ww 6l errored\n");
+		fprintf(stderr, "w6l_ww-dyn FAIL: ww w6l errored\n");
 		unlink(co); unlink(wo);
 		return 1;
 	}
@@ -105,14 +105,14 @@ main(void)
 	size_t nc = 0, nw = 0;
 	int rc = 0;
 	if (slurp(co, &bc, &nc) < 0 || slurp(wo, &bw, &nw) < 0) {
-		fprintf(stderr, "6l_ww-dyn FAIL: cannot read outputs\n");
+		fprintf(stderr, "w6l_ww-dyn FAIL: cannot read outputs\n");
 		rc = 1;
 	} else if (nc != nw || memcmp(bc, bw, nc) != 0) {
-		fprintf(stderr, "6l_ww-dyn FAIL: C %zu vs ww %zu bytes\n",
+		fprintf(stderr, "w6l_ww-dyn FAIL: C %zu vs ww %zu bytes\n",
 		    nc, nw);
 		rc = 1;
 	} else {
-		printf("6l_ww-dyn: byte-identical to C 6l on snake "
+		printf("w6l_ww-dyn: byte-identical to C w6l on snake "
 		    "(PT_INTERP + PT_DYNAMIC + .rela.plt + .gnu.version_r, "
 		    "%zu bytes)\n", nc);
 	}