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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.
#include <map>
#include "src/signature.h"
#include "src/wasm/wasm-opcodes.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 {
// 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.
// Gets the index for a signature, assigning a new index if necessary.
uint32_t FindOrInsert(FunctionSig* sig);
// Gets the index for a signature, returning {-1} if not found.
int32_t Find(FunctionSig* sig) const;
// Disallows further insertions to this signature map.
void Freeze() { frozen_ = true; }
// TODO(wasm): use a hashmap instead of an ordered map?
struct CompareFunctionSigs {
bool operator()(FunctionSig* a, FunctionSig* b) const;
uint32_t next_ = 0;
bool frozen_ = false;
std::map<FunctionSig*, uint32_t, CompareFunctionSigs> map_;
} // namespace wasm
} // namespace internal
} // namespace v8