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cgen: str chained <expr>.field = v store -> 3-word -- Phase 2 G2 (both stages)

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Storing a str into a field reached through a *struct-valued expression (e.g. r.sym.flag = v) wrote only 2 words (ptr,len), dropping cap -- the second STORE-cluster fold. Direct transfer of G1 (c692923): the prior arm spilled only ptr/len across the base eval; now spill the full value (PUSHQ CX/BX/AX) after the rhs eval and before the base-expr eval (the stack slot insulates it, base-formation-agnostic), stage the *struct ptr in DX (off the AX/BX/CX str convention), store ptr/len/cap at foff+{0,8,16}. Mirrors the s.f=v oracle (cgen.c:2603); G2 adds the spill the oracle skips because the oracle's base is a slot read, not a clobbering expr. Kind-gated (TY_STR/typeisstr, never size==24). cstage==wwstage byte-identical at the store site.

test/wcc/938: table-driven write-then-read-cap over depth-2 (r.sym.f=) and depth-3 (r.a.b.f=) chained bases, both asm-confirmed to hit the chained arm. rhs is a cap!=len str; all 3 slot words pre-poisoned via a non-G2 direct store; full {ptr,len,cap} triple asserted. fail-before/pass-after verified on both drivers.

main.combined.ww regenerated via the canonical make path (md5-stable).
This commit is contained in:
Hojun-Cho
2026-05-24 16:18:49 +09:00
parent c6929231dc
commit b51a7daa25
6 changed files with 287 additions and 27 deletions
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7
Makefile
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@@ -260,6 +260,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_str_tuple_elem_cap_run \
$(BIN)/test_str_arrfield_cap_run \
$(BIN)/test_str_arrfield_store_cap_run \
$(BIN)/test_str_chainfield_store_cap_run \
$(BIN)/test_composite_call_arg \
$(BIN)/test_composite_call_arg_run \
$(BIN)/test_letdecl_zeroinit \
@@ -662,6 +663,12 @@ $(BIN)/test_str_arrfield_store_cap_run: test/wcc/937_str_arrfield_store_cap_run.
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_str_chainfield_store_cap_run: test/wcc/938_str_chainfield_store_cap_run.c \
$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_composite_call_arg: test/wcc/723_composite_call_arg.c \
$(BIN)/w6c $(BIN)/w6c_ww | $(BIN)
$(CC) $(CFLAGS) -o $@ $<