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[wasm] Introduce <bot> type for unreachable br_table again

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This CL implements the spec change done in
https://github.com/WebAssembly/reference-types/pull/116.

R=manoskouk@chromium.org

Bug: v8:10994
Change-Id: Ic2b4e0a52af225b5640447fe051a9c36e6d41be2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2534818
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71260}
This commit is contained in:
Andreas Haas 2020-11-12 17:52:35 +01:00 committed by Commit Bot
parent c5d998a251
commit 4e12eddda6
3 changed files with 2 additions and 12 deletions
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9
src/wasm/function-body-decoder-impl.h
View File

@ -3407,17 +3407,8 @@ class WasmFullDecoder : public WasmDecoder<validate> {
for (int i = 0; i < br_arity; ++i) {
if (this->enabled_.has_reftypes()) {
// The expected type is the biggest common sub type of all targets.
ValueType type = (*result_types)[i];
(*result_types)[i] =
CommonSubtype((*result_types)[i], (*merge)[i].type, this->module_);
if (!VALIDATE((*result_types)[i] != kWasmBottom)) {
this->DecodeError(pos,
"inconsistent type in br_table target %u (previous "
"was %s, this one is %s)",
index, type.name().c_str(),
(*merge)[i].type.name().c_str());
return false;
}
} else {
// All target must have the same signature.
if (!VALIDATE((*result_types)[i] == (*merge)[i].type)) {

3
test/mjsunit/regress/wasm/regress-1046472.js
View File

@ -29,6 +29,5 @@ kExprEnd, // @21
assertThrows(
() => {builder.toModule()}, WebAssembly.CompileError,
'WebAssembly.Module(): Compiling function #0:\"main\" failed: ' +
'inconsistent type in br_table target 1 (previous was i32, ' +
'this one is f32) @+60');
'type error in merge[0] (expected <bot>, got i32) @+57');
})();

2
test/wasm-spec-tests/wasm-spec-tests.status
View File

@ -9,7 +9,6 @@
'binary': [FAIL],
'proposals/bulk-memory-operations/binary': [FAIL],
# TODO(v8:10994): Failing spec test after update.
'proposals/reference-types/br_table': [FAIL],
'proposals/simd/binary': [FAIL],
'proposals/simd/data': [FAIL],
'proposals/js-types/data': [FAIL],
@ -36,6 +35,7 @@
'proposals/tail-call/imports': [FAIL],
'proposals/tail-call/linking': [FAIL],
'proposals/tail-call/type': [FAIL],
'proposals/tail-call/unreached-invalid': [FAIL],
# This test requires the reftypes flag to be disabled.
'proposals/bulk-memory-operations/imports': [FAIL],