| // Copyright 2017 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_LOCAL_DECL_ENCODER_H_ |
| #define V8_WASM_LOCAL_DECL_ENCODER_H_ |
| |
| #include "src/globals.h" |
| #include "src/wasm/wasm-opcodes.h" |
| #include "src/zone/zone-containers.h" |
| #include "src/zone/zone.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace wasm { |
| |
| // A helper for encoding local declarations prepended to the body of a |
| // function. |
| class V8_EXPORT_PRIVATE LocalDeclEncoder { |
| public: |
| explicit LocalDeclEncoder(Zone* zone, FunctionSig* s = nullptr) |
| : sig(s), local_decls(zone), total(0) {} |
| |
| // Prepend local declarations by creating a new buffer and copying data |
| // over. The new buffer must be delete[]'d by the caller. |
| void Prepend(Zone* zone, const byte** start, const byte** end) const; |
| |
| size_t Emit(byte* buffer) const; |
| |
| // Add locals declarations to this helper. Return the index of the newly added |
| // local(s), with an optional adjustment for the parameters. |
| uint32_t AddLocals(uint32_t count, ValueType type); |
| |
| size_t Size() const; |
| |
| bool has_sig() const { return sig != nullptr; } |
| FunctionSig* get_sig() const { return sig; } |
| void set_sig(FunctionSig* s) { sig = s; } |
| |
| private: |
| FunctionSig* sig; |
| ZoneVector<std::pair<uint32_t, ValueType>> local_decls; |
| size_t total; |
| }; |
| |
| } // namespace wasm |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_WASM_LOCAL_DECL_ENCODER_H_ |