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/*
* Copyright 2017 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.
*/
#ifndef _wasm_ir_hashed_h
#define _wasm_ir_hashed_h
#include "ir/utils.h"
#include "support/hash.h"
#include "wasm.h"
#include <functional>
namespace wasm {
// A pass that hashes all functions
struct FunctionHasher : public WalkerPass<PostWalker<FunctionHasher>> {
bool isFunctionParallel() override { return true; }
bool modifiesBinaryenIR() override { return false; }
struct Map : public std::map<Function*, size_t> {};
FunctionHasher(Map* output, ExpressionAnalyzer::ExprHasher customHasher)
: output(output), customHasher(customHasher) {}
FunctionHasher(Map* output)
: output(output), customHasher(ExpressionAnalyzer::nothingHasher) {}
std::unique_ptr<Pass> create() override {
return std::make_unique<FunctionHasher>(output, customHasher);
}
static Map createMap(Module* module) {
Map hashes;
for (auto& func : module->functions) {
// ensure an entry for each function - we must not modify the map shape in
// parallel, just the values
hashes[func.get()] = hash(0);
}
return hashes;
}
void doWalkFunction(Function* func) {
output->at(func) = flexibleHashFunction(func, customHasher);
}
static size_t
flexibleHashFunction(Function* func,
ExpressionAnalyzer::ExprHasher customHasher) {
auto digest = hash(func->type);
for (auto type : func->vars) {
rehash(digest, type.getID());
}
hash_combine(digest,
ExpressionAnalyzer::flexibleHash(func->body, customHasher));
return digest;
}
static size_t hashFunction(Function* func) {
return flexibleHashFunction(func, ExpressionAnalyzer::nothingHasher);
}
private:
Map* output;
ExpressionAnalyzer::ExprHasher customHasher;
};
} // namespace wasm
#endif // _wasm_ir_hashed_h
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