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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"
namespace wasm {
// An expression with a cached hash value
struct HashedExpression {
Expression* expr;
HashType hash;
HashedExpression(Expression* expr) : expr(expr) {
if (expr) {
hash = ExpressionAnalyzer::hash(expr);
}
}
HashedExpression(const HashedExpression& other)
: expr(other.expr), hash(other.hash) {}
};
struct ExpressionHasher {
HashType operator()(const HashedExpression value) const { return value.hash; }
};
struct ExpressionComparer {
bool operator()(const HashedExpression a, const HashedExpression b) const {
if (a.hash != b.hash) {
return false;
}
return ExpressionAnalyzer::equal(a.expr, b.expr);
}
};
template<typename T>
class HashedExpressionMap
: public std::
unordered_map<HashedExpression, T, ExpressionHasher, ExpressionComparer> {
};
// A pass that hashes all functions
struct FunctionHasher : public WalkerPass<PostWalker<FunctionHasher>> {
bool isFunctionParallel() override { return true; }
struct Map : public std::map<Function*, HashType> {};
FunctionHasher(Map* output) : output(output) {}
FunctionHasher* create() override { return new FunctionHasher(output); }
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()] = 0;
}
return hashes;
}
void doWalkFunction(Function* func) { output->at(func) = hashFunction(func); }
static HashType hashFunction(Function* func) {
HashType ret = 0;
ret = rehash(ret, (HashType)func->getNumParams());
for (auto type : func->params) {
ret = rehash(ret, (HashType)type);
}
ret = rehash(ret, (HashType)func->getNumVars());
for (auto type : func->vars) {
ret = rehash(ret, (HashType)type);
}
ret = rehash(ret, (HashType)func->result);
ret = rehash(ret,
HashType(func->type.is() ? std::hash<wasm::Name>{}(func->type)
: HashType(0)));
ret = rehash(ret, (HashType)ExpressionAnalyzer::hash(func->body));
return ret;
}
private:
Map* output;
};
} // namespace wasm
#endif // _wasm_ir_hashed_h
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