| // 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_ |