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cgen: default the hi bound of an N_DOT array-field slice arg

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pushargsrev's N_SLICE arm resolved esz and the base address from the
stamped tinfo of an N_DOT [N]T-field base but let the omitted hi bound
fall to $0, so the #258 array-to-slice borrow desugar handed callees a
zero-length slice: base64 clear()'s bytes.zero(e.ibuf) was a runtime
no-op under the wwstage frontend. Take the element count from the
field's array tinfo like the cgslice #252 arm and cstage's bu->alen.
Graduates r989_libprecond_decodedsize_aligned and the 989_lib_byteid
#59.3 base64 pin.
This commit is contained in:
Hojun-Cho
2026-08-07 23:50:02 +09:00
parent 58641e97a5
commit 4559b52950
3 changed files with 13 additions and 3 deletions
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2
Makefile
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@@ -586,7 +586,7 @@ DATABYTEID_EXPECTED_MIN = 911
DATABYTEID_DIVERGED = r71_tagged_return_scratch_mixed \
r76_typeeq_fn_diff_arity r76_typeeq_fn_diff_param_type \
r76_typeeq_fn_io_vtable_shape r76_typeeq_fn_variadic_vs_fixed \
r940_str_forrange_arg r989_libprecond_decodedsize_aligned
r940_str_forrange_arg
$(if $(DATABYTEID_FILES),,$(error test-byteid: empty data corpus))
test-data-byteid: $(BIN)/ww $(BIN)/w6c $(BIN)/w6c_ww
@work=$$(mktemp -d "$(CURDIR)/$(DATABYTEID_DIR).XXXXXX") || exit 1; \

10
selfhost/cmd/wcc/cgenutil.ww
View File

@@ -774,9 +774,17 @@ fn pushargsrev(c: *cgen, arg: *syntax.node, param: *syntax.node, memphase: bool,
emitline("\tMOVQ\t8(CX), AX\n");
};};
};
} else { if (dotbu != nil && dotbu.kind == syntax.tykind.TY_ARRAY) {
// #252 twin: default-hi over an N_DOT `[N]T`-field base —
// element count from the field's array tinfo (cstage reads
// bu->alen uniformly). Without this the #258 array→slice
// borrow desugar handed callees a 0-length slice.
emitline("\tMOVQ\t$");
emitint(dotbu.alen: i64);
emitline(", AX\n");
} else {
emitline("\tMOVQ\t$0, AX\n");
};};};
};};};};
emitline("\tPUSHQ\tAX\n");
// lo (default 0) → AX
if (lo != nil) { cgexpr(c, lo); }

4
test/wcc/989_lib_byteid.c
View File

@@ -145,8 +145,10 @@ static const struct ent ents[] = {
{ .fixture = "lib/ascii/asciitest.ww",
.mode = M_ID, .cite = "#59.1 graduated by #146 str==" },
/* #59.2 bufio graduated to M_ID above (#129 fix) */
/* #59.3 base64 graduated to M_ID (pushargsrev N_DOT array-field
* default-hi fix — clear()'s borrow no longer zero-length) */
{ .fixture = "lib/encoding/base64/base64_test.ww",
.mode = M_DIVERGE, .cite = "#59.3" },
.mode = M_ID },
/* #59.4 hextest graduated to M_ID above (#22a reviewer fixes) */
{ .fixture = "lib/errors/errnotest.ww",
.mode = M_DIVERGE, .cite = "#59.5" },