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types: add INT/UINT limit constants, derived from size(int) (#114)

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ww's int/uint are machine words (8B on amd64, type.c:58), not the 4B
Hare gives them on amd64 (arch+x86_64.ha maps INT_MAX->I32_MAX). So the
limits can't alias a per-arch literal; they DERIVE from size(int) the
Go way (cf math.MaxInt), staying correct on any word width:

  INT_MAX:  int  = (1 << (size(int)*8 - 1)) - 1
  INT_MIN:  int  = -1 << (size(int)*8 - 1)
  UINT_MIN: uint = 0
  UINT_MAX: uint = ~(0: uint)

All four const-fold in def-init; on amd64 they evaluate to I64_MAX,
I64_MIN, 0, U64_MAX. UINT_MAX uses the all-ones complement to dodge the
1<<64 overflow. Per the user ruling (2026-05-26): derived, not literal.

Probe 959_types_intlim_run asserts each value vs both the literal and
the i64/u64 limit const, plus wrap-through-i32 arithmetic usability.
combined.ww regenerated for all 5 selfhost tools + smoke (all embed
lib/types).
This commit is contained in:
Hojun-Cho
2026-05-26 08:31:41 +09:00
parent b1c598651f
commit d9cfb91cb9
9 changed files with 206 additions and 0 deletions
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5
Makefile
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@@ -336,6 +336,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_floats_run \
$(BIN)/test_size_type_run \
$(BIN)/test_types_sizelim_run \
$(BIN)/test_types_intlim_run \
$(BIN)/test_bufio_run $(BIN)/test_random_run
$(BIN)/test_smoke: test/wcc/000_smoke.c $(LIB)/libwcc.a | $(BIN)
@@ -1091,6 +1092,10 @@ $(BIN)/test_types_sizelim_run: test/wcc/958_types_sizelim_run.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_types_intlim_run: test/wcc/959_types_intlim_run.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_f64crossmod_run: test/wcc/953_f64crossmod_run.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6c_ww $(BIN)/w6a $(BIN)/w6l \
$(LIB)/libwwrt.a | $(BIN)