Line data Source code
1 : // Copyright 2017 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_LOCAL_DECL_ENCODER_H_
6 : #define V8_WASM_LOCAL_DECL_ENCODER_H_
7 :
8 : #include "src/wasm/wasm-opcodes.h"
9 : #include "src/zone/zone-containers.h"
10 : #include "src/zone/zone.h"
11 :
12 : namespace v8 {
13 : namespace internal {
14 : namespace wasm {
15 :
16 : // A helper for encoding local declarations prepended to the body of a
17 : // function.
18 : class LocalDeclEncoder {
19 : public:
20 : explicit LocalDeclEncoder(Zone* zone, FunctionSig* s = nullptr)
21 41590 : : sig(s), local_decls(zone), total(0) {}
22 :
23 : // Prepend local declarations by creating a new buffer and copying data
24 : // over. The new buffer must be delete[]'d by the caller.
25 : void Prepend(Zone* zone, const byte** start, const byte** end) const;
26 :
27 : size_t Emit(byte* buffer) const;
28 :
29 : // Add locals declarations to this helper. Return the index of the newly added
30 : // local(s), with an optional adjustment for the parameters.
31 : uint32_t AddLocals(uint32_t count, ValueType type);
32 :
33 : size_t Size() const;
34 :
35 : bool has_sig() const { return sig != nullptr; }
36 : FunctionSig* get_sig() const { return sig; }
37 20596 : void set_sig(FunctionSig* s) { sig = s; }
38 :
39 : private:
40 : FunctionSig* sig;
41 : ZoneVector<std::pair<uint32_t, ValueType>> local_decls;
42 : size_t total;
43 : };
44 :
45 : } // namespace wasm
46 : } // namespace internal
47 : } // namespace v8
48 :
49 : #endif // V8_WASM_LOCAL_DECL_ENCODER_H_
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