// 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/common/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, const 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; } const FunctionSig* get_sig() const { return sig; } void set_sig(const FunctionSig* s) { sig = s; } private: const 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_