Line data    Source code

       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       70675 : 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_