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/*
* Copyright 2024 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/return-utils.h"
#include "ir/module-utils.h"
#include "wasm-builder.h"
#include "wasm-traversal.h"
#include "wasm.h"
namespace wasm::ReturnUtils {
namespace {
struct ReturnValueRemover : public PostWalker<ReturnValueRemover> {
void visitReturn(Return* curr) {
auto* value = curr->value;
assert(value);
curr->value = nullptr;
Builder builder(*getModule());
replaceCurrent(builder.makeSequence(builder.makeDrop(value), curr));
}
void visitCall(Call* curr) { handleReturnCall(curr); }
void visitCallIndirect(CallIndirect* curr) { handleReturnCall(curr); }
void visitCallRef(CallRef* curr) { handleReturnCall(curr); }
template<typename T> void handleReturnCall(T* curr) {
if (curr->isReturn) {
Fatal() << "Cannot remove return_calls in ReturnValueRemover";
}
}
void visitFunction(Function* curr) {
if (curr->body->type.isConcrete()) {
curr->body = Builder(*getModule()).makeDrop(curr->body);
}
}
};
} // anonymous namespace
void removeReturns(Function* func, Module& wasm) {
ReturnValueRemover().walkFunctionInModule(func, &wasm);
}
std::unordered_map<Function*, bool> findReturnCallers(Module& wasm) {
ModuleUtils::ParallelFunctionAnalysis<bool> analysis(
wasm, [&](Function* func, bool& hasReturnCall) {
if (func->imported()) {
return;
}
struct Finder : PostWalker<Finder> {
bool hasReturnCall = false;
void visitCall(Call* curr) {
if (curr->isReturn) {
hasReturnCall = true;
}
}
void visitCallIndirect(CallIndirect* curr) {
if (curr->isReturn) {
hasReturnCall = true;
}
}
void visitCallRef(CallRef* curr) {
if (curr->isReturn) {
hasReturnCall = true;
}
}
} finder;
finder.walk(func->body);
hasReturnCall = finder.hasReturnCall;
});
// Convert to an unordered map for fast lookups. TODO: Avoid a copy here.
std::unordered_map<Function*, bool> ret;
ret.reserve(analysis.map.size());
for (auto& [k, v] : analysis.map) {
ret[k] = v;
}
return ret;
}
} // namespace wasm::ReturnUtils
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