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Copy pathsubtype-exprs.cpp
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79 lines (69 loc) · 2.8 KB
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/*
* Copyright 2025 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ir/subtype-exprs.h"
#include "wasm-traversal.h"
#include "wasm.h"
#include "gtest/gtest.h"
using namespace wasm;
static Type anyref = Type(HeapType::any, Nullable);
// A BrIf must require of its value to both match the block it targets, and
// also the BrIf itself, as the value flows out.
TEST(SubtypeExprsTest, BrIf) {
Module wasm;
Builder builder(wasm);
// A br_if in a block, whose value is a null.
auto* null = builder.makeRefNull(HeapType::any);
auto* c = builder.makeConst(Literal(int32_t(42)));
auto* brIf = builder.makeBreak("block", null, c);
auto* block = builder.makeBlock("block", {brIf}, anyref);
auto* drop = builder.makeDrop(block);
auto func = builder.makeFunction(
"func", {}, Signature(Type::none, Type::none), {}, drop);
// Implement a SubtypingDiscoverer.
struct Finder
: public ControlFlowWalker<Finder, SubtypingDiscoverer<Finder>> {
std::set<Expression*> seen;
void noteSubtype(Type sub, Type super) {}
void noteSubtype(HeapType sub, HeapType super) {}
void noteSubtype(Type sub, Expression* super) {}
void noteSubtype(Expression* sub, Type super) {}
void noteSubtype(Expression* sub, Expression* super) {
if (sub->is<RefNull>()) {
// The null will be called with two constraints: the block (the null is
// sent there) and also the break (the null flows out through it).
seen.insert(super);
}
}
void noteNonFlowSubtype(Expression* sub, Type super) {}
void noteCast(HeapType src, Type dst) {}
void noteCast(Expression* src, Type dst) {}
void noteCast(Expression* src, Expression* dst) {}
} finder;
finder.walkFunctionInModule(func.get(), &wasm);
// We should have seen both things.
ASSERT_EQ(finder.seen.size(), 2);
EXPECT_EQ(finder.seen.count(brIf), 1);
EXPECT_EQ(finder.seen.count(block), 1);
// Remove the condition from the br. Now it is unreachable and no value
// flows out.
brIf->condition = nullptr;
brIf->type = Type::unreachable;
// We should now only see the sent value - nothing flows out to the br_if.
finder.seen.clear();
finder.walkFunctionInModule(func.get(), &wasm);
ASSERT_EQ(finder.seen.size(), 1);
EXPECT_EQ(finder.seen.count(block), 1);
}