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cstage+selfhost+test: fold unary-over-literal in def DATA emit (#24)

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Top-level `def NEG: i32 = -100;` skipped DATA emission in both stages
— cstage's emit_defs and wwstage's emitdefconstants each carried a
literal-leaf whitelist that excluded N_UN nodes. Same gap in
check.c's eval_enum_value cstage-side. Surfaced during #10 (lib/os
forced an `at` enum for AT_FDCWD=-100 etc. as workaround).

Factor a single fold_int_literal helper (cstage check.c; wwstage
cgen.ww). Handles N_INTLIT / N_RUNELIT / N_TRUE / N_FALSE / N_NIL
plus N_UN with TK_MINUS / TK_TILDE / TK_PLUS recursively. Consume
from eval_enum_value, emit_defs, emitdefconstants, enumevalmember —
single source of truth for "is this a literal-leaf foldable".

Side effect: cstage's def-emit set widens from {INTLIT, RUNELIT,
TRUE} to match wwstage's pre-existing 5-shape set plus the new
unary peel. Bootstrap byte-id holds (995_self_rebuild green).

Test 631 (def_neg_global): 6 rows × cstage/wwstage run + asm
byte-identity diff. Covers all three unary arms (-, ~, +), positive
regression-pin, i32 + i64 + u32 slots.

Follows up #26: revert lib/os.ww `at` enum to three top-level defs.
This commit is contained in:
Hojun-Cho
2026-05-16 03:00:34 +09:00
parent 2f9d6dc43a
commit cf24af8b26
8 changed files with 457 additions and 48 deletions
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8
Makefile
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@@ -215,7 +215,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_w6l $(BIN)/test_data_link \
$(BIN)/test_arch \
$(BIN)/test_e2e $(BIN)/test_ffi $(BIN)/test_dyn $(BIN)/test_stdlib \
$(BIN)/test_at_test $(BIN)/test_let_global \
$(BIN)/test_at_test $(BIN)/test_let_global $(BIN)/test_def_neg_global \
$(BIN)/test_int_cast_signed $(BIN)/test_dot_chain \
$(BIN)/test_amp_dot $(BIN)/test_arr_elem_field \
$(BIN)/test_arr_elem_field_write \
@@ -305,6 +305,12 @@ $(BIN)/test_let_global: test/wcc/630_let_global.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_def_neg_global: test/wcc/631_def_neg_global.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_int_cast_signed: test/wcc/640_int_cast_signed.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \