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wcc/cgen: #58 indexed tagged-field read+assign cursor arm (both-stage)

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Reading or writing a tagged field of an indexed array element
(xs[i].field) was broken on BOTH stages, byte-identically and
silently (#263 gate-blind): the arr[i].field branches had arms for
array/str/slice/float but no TY_TAGGED arm, so the tagged field fell
to the single-word scalar path. READ loaded only the tag word (stale
payload -> `xs[i].min as T` read garbage); ASSIGN stored the raw
unboxed scalar into the tag slot, corrupting the box.

Insert a TY_TAGGED cursor arm before each scalar fallback, both
sites both stages (cgen.c read + assign; cgenexpr.ww cgdot N_INDEX-lhs
read + cgassign indexed-field). READ mirrors cg_tagged_memread
(payload -> DX/CX/R8, tag -> AX last). ASSIGN synthesizes the tag for
the concrete variant (taggedvariantindext) and stores tag+payload via
the str/slice 3-word store spine -- not the source-remap widener
(concrete rhs has no source tag to remap).

>32B / multi-word / float payloads are loud-stopped at all four arms
(emission not yet wired; see #114). That shape is reachable today via
a narrow-variant ctor, so it louds rather than silently miscompiling.
Both stages get the same arm -> byte-id preserved (990-997 green; the
runtime is the net for this #263 class). Pin 944_idx_tagged_field_run
(read/assign runtime rows + >32B expect-loud rows).
This commit is contained in:
Hojun-Cho
2026-06-06 16:21:45 +09:00
parent cc896bd078
commit 351abb0ab3
6 changed files with 905 additions and 0 deletions
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7
Makefile
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@@ -310,6 +310,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_alias_amp_idx_run \
$(BIN)/test_alias_def_addr_run \
$(BIN)/test_def_amp_idx_run \
$(BIN)/test_idx_tagged_field_run \
$(BIN)/test_tagged_widen_arg_run \
$(BIN)/test_alias_global_decl_run \
$(BIN)/test_alias_cgen_b5_run \
@@ -1519,6 +1520,12 @@ $(BIN)/test_def_amp_idx_run: test/wcc/944_def_amp_idx_run.c \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_idx_tagged_field_run: test/wcc/944_idx_tagged_field_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_tagged_widen_arg_run: test/wcc/944_tagged_widen_arg_run.c \
$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \