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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_WASM_SIGNATURE_MAP_H_
#define V8_WASM_SIGNATURE_MAP_H_
#include <unordered_map>
#include "src/codegen/signature.h"
#include "src/wasm/value-type.h"
namespace v8 {
namespace internal {
namespace wasm {
// A signature map canonicalizes signatures into a range of indices so that
// two different {FunctionSig} instances with the same contents map to the
// same index.
class V8_EXPORT_PRIVATE SignatureMap {
public:
// Allow default construction and move construction (because we have vectors
// of objects containing SignatureMaps), but disallow copy or assign. It's
// too easy to get security bugs by accidentally updating a copy of the map.
MOVE_ONLY_WITH_DEFAULT_CONSTRUCTORS(SignatureMap);
// Gets the index for a signature, assigning a new index if necessary.
uint32_t FindOrInsert(const FunctionSig& sig);
// Gets the index for a signature, returning {-1} if not found.
int32_t Find(const FunctionSig& sig) const;
// Disallows further insertions to this signature map.
void Freeze() { frozen_ = true; }
size_t size() const { return map_.size(); }
bool is_frozen() const { return frozen_; }
private:
bool frozen_ = false;
std::unordered_map<FunctionSig, uint32_t, base::hash<FunctionSig>> map_;
};
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_SIGNATURE_MAP_H_