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wcc/ww: out/.pkgcache content-keyed package cache for --sep (M3-tail c5b, #63)

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Per-package build cache for `ww build --sep`: before recompiling a
package, recompute a plain-text key manifest (md5sum-hex lines of the
package sources, each direct dep's .wwi, the w6c and w6a binaries, plus
the compile flags) and reuse the cached .o/.wwi on a byte-for-byte key
hit. Both stages shell the same host md5sum (no ww-side md5) so the
non-compiler key lines are byte-identical cstage==wwstage; the compiler
md5 lines differ per stage BY DESIGN, giving each stage its own cache
namespace so a hit can never reuse the other stage's .o and mask a
cs!=ww codegen divergence. Cached outputs (.o/.wwi) stay byte-identical
across stages. Root package never cached; cache lives under $(OUT)
(gitignored, wiped by make clean). Both stages mirrored.

Dev-only convenience, off every bootstrap/byte-id gate. Gate
989_pkgcache_run (cold) proves miss-compiles / hit-skips-byte-id /
independent key-bust per input class with non-vacuity rehit.
This commit is contained in:
Hojun-Cho
2026-06-16 15:35:26 +09:00
parent 62c7771594
commit 7b36f961a9
5 changed files with 1046 additions and 14 deletions
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12
Makefile
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@@ -566,6 +566,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_sepbuild_run \
$(BIN)/test_sepcycle_dup \
$(BIN)/test_separchive_run \
$(BIN)/test_pkgcache_run \
$(BIN)/test_floatlit_run \
$(BIN)/test_checked_run \
$(BIN)/test_floatarr_run \
@@ -3129,6 +3130,17 @@ $(BIN)/test_separchive_run: test/wcc/989_separchive_run.c $(BIN)/ww $(BIN)/ww_ww
$(BIN)/w6l $(BIN)/w6l_ww $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
# 989_pkgcache_run — M3-tail commit-5b gate (#46, #63): the out/.pkgcache
# content-keyed package cache. COLD/dev-only (off every byte-id/bootstrap
# gate): MISS compiles, HIT skips + non-vacuously reuses byte-identical
# artifacts, and the key busts on each input class (src / dep .wwi / compiler
# md5 / flags) — both driver stages, with cs==ww cached P.o/P.wwi. Needs both
# driver + both compiler + both linker stages + libwwrt.a.
$(BIN)/test_pkgcache_run: test/wcc/989_pkgcache_run.c $(BIN)/ww $(BIN)/ww_ww \
$(BIN)/w6c $(BIN)/w6c_ww $(BIN)/w6a $(BIN)/w6a_ww \
$(BIN)/w6l $(BIN)/w6l_ww $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_floatlit_run: test/wcc/989_floatlit_run.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6c_ww $(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<