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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_CODE_REFERENCE_H_
#define V8_CODE_REFERENCE_H_
#include "src/handles.h"
#include "src/objects/code.h"
namespace v8 {
namespace internal {
class Code;
class CodeDesc;
namespace wasm {
class WasmCode;
}
class CodeReference {
public:
CodeReference() : kind_(NONE), null_(nullptr) {}
explicit CodeReference(const wasm::WasmCode* wasm_code)
: kind_(WASM), wasm_code_(wasm_code) {}
explicit CodeReference(const CodeDesc* code_desc)
: kind_(CODE_DESC), code_desc_(code_desc) {}
explicit CodeReference(Handle<Code> js_code) : kind_(JS), js_code_(js_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;
bool is_null() const { return kind_ == NONE; }
bool is_js() const { return kind_ == JS; }
bool is_wasm_code() const { return kind_ == WASM; }
Handle<Code> as_js_code() const {
DCHECK_EQ(JS, kind_);
return js_code_;
}
const wasm::WasmCode* as_wasm_code() const {
DCHECK_EQ(WASM, kind_);
return wasm_code_;
}
private:
enum { NONE, JS, WASM, CODE_DESC } kind_;
union {
std::nullptr_t null_;
const wasm::WasmCode* wasm_code_;
const CodeDesc* code_desc_;
Handle<Code> js_code_;
};
DISALLOW_NEW_AND_DELETE();
};
ASSERT_TRIVIALLY_COPYABLE(CodeReference);
} // namespace internal
} // namespace v8
#endif // V8_CODE_REFERENCE_H_