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w6a: DATAW directive for writable .data section

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First step toward top-level mutable `let`. Adds a sibling directive to
DATA whose bytes land in a separate writable .data PROGBITS section
(SHF_ALLOC|SHF_WRITE, STT_OBJECT) instead of .text. The section is
emitted only when DATAW was used, so inputs without it produce a
byte-identical .o — tests 991 (selfhost .o diff) and 995 (self-rebuild)
keep passing unchanged.

w6l still treats data-resident syms as undefined; that's the next step.
This commit is contained in:
Hojun-Cho
2026-05-12 11:35:50 +09:00
parent 922877309b
commit 1b0955c97b
7 changed files with 381 additions and 18 deletions
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6
Makefile
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@@ -210,7 +210,8 @@ $(BIN) $(LIB) $(OBJ)/wcc $(OBJ)/ww $(OBJ)/wwdump $(OBJ)/w6c $(OBJ)/w6a $(OBJ)/w6
# ---- 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_w6c $(BIN)/test_w6a $(BIN)/test_w6l $(BIN)/test_arch \
$(BIN)/test_w6c $(BIN)/test_w6a $(BIN)/test_dataw $(BIN)/test_w6l \
$(BIN)/test_arch \
$(BIN)/test_e2e $(BIN)/test_ffi $(BIN)/test_dyn $(BIN)/test_stdlib \
$(BIN)/test_at_test \
$(BIN)/test_selfhost $(BIN)/test_w6a_ww $(BIN)/test_w6l_ww \
@@ -235,6 +236,9 @@ $(BIN)/test_w6c: test/wcc/400_w6c.c $(BIN)/w6c | $(BIN)
$(BIN)/test_w6a: test/wcc/500_w6a.c $(BIN)/w6c $(BIN)/w6a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_dataw: test/wcc/510_dataw.c $(BIN)/w6a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_w6l: test/wcc/600_w6l.c $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l | $(BIN)
$(CC) $(CFLAGS) -o $@ $<