1 // Copyright 2016 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_WASM_SIGNATURE_MAP_H_ 6 #define V8_WASM_SIGNATURE_MAP_H_ 7 8 #include <map> 9 10 #include "src/signature.h" 11 #include "src/wasm/wasm-opcodes.h" 12 13 namespace v8 { 14 namespace internal { 15 namespace wasm { 16 17 // A signature map canonicalizes signatures into a range of indices so that 18 // two different {FunctionSig} instances with the same contents map to the 19 // same index. 20 class V8_EXPORT_PRIVATE SignatureMap { 21 public: 22 // Gets the index for a signature, assigning a new index if necessary. 23 uint32_t FindOrInsert(FunctionSig* sig); 24 25 // Gets the index for a signature, returning {-1} if not found. 26 int32_t Find(FunctionSig* sig) const; 27 28 private: 29 // TODO(wasm): use a hashmap instead of an ordered map? 30 struct CompareFunctionSigs { 31 bool operator()(FunctionSig* a, FunctionSig* b) const; 32 }; 33 uint32_t next_ = 0; 34 std::map<FunctionSig*, uint32_t, CompareFunctionSigs> map_; 35 }; 36 37 } // namespace wasm 38 } // namespace internal 39 } // namespace v8 40 41 #endif // V8_WASM_SIGNATURE_MAP_H_ 42
