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// 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.
#if !V8_ENABLE_WEBASSEMBLY
#error This header should only be included if WebAssembly is enabled.
#endif // !V8_ENABLE_WEBASSEMBLY
#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_
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