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_
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