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// Copyright 2018 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_CODEGEN_CODE_REFERENCE_H_
#define V8_CODEGEN_CODE_REFERENCE_H_
#include "src/base/platform/platform.h"
#include "src/handles/handles.h"
#include "src/objects/code.h"
namespace v8 {
namespace internal {
class InstructionStream;
class Code;
class CodeDesc;
namespace wasm {
class WasmCode;
} // namespace wasm
class CodeReference {
public:
CodeReference() : kind_(Kind::NONE), null_(nullptr) {}
explicit CodeReference(const wasm::WasmCode* wasm_code)
: kind_(Kind::WASM_CODE), wasm_code_(wasm_code) {}
explicit CodeReference(const CodeDesc* code_desc)
: kind_(Kind::CODE_DESC), code_desc_(code_desc) {}
explicit CodeReference(Handle<Code> code) : kind_(Kind::CODE), code_(code) {}
Address constant_pool() const;
Address instruction_start() const;
Address instruction_end() const;
int instruction_size() const;
const byte* relocation_start() const;
const byte* relocation_end() const;
int relocation_size() const;
Address code_comments() const;
int code_comments_size() const;
bool is_null() const { return kind_ == Kind::NONE; }
bool is_code() const { return kind_ == Kind::CODE; }
bool is_wasm_code() const { return kind_ == Kind::WASM_CODE; }
Handle<Code> as_code() const {
DCHECK_EQ(Kind::CODE, kind_);
return code_;
}
const wasm::WasmCode* as_wasm_code() const {
DCHECK_EQ(Kind::WASM_CODE, kind_);
return wasm_code_;
}
private:
enum class Kind { NONE, CODE, WASM_CODE, CODE_DESC } kind_;
union {
std::nullptr_t null_;
const wasm::WasmCode* wasm_code_;
const CodeDesc* code_desc_;
Handle<Code> code_;
};
DISALLOW_NEW_AND_DELETE()
};
ASSERT_TRIVIALLY_COPYABLE(CodeReference);
} // namespace internal
} // namespace v8
#endif // V8_CODEGEN_CODE_REFERENCE_H_
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