// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_CODE_REFERENCE_H_
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#define V8_CODE_REFERENCE_H_
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#include "src/handles.h"
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#include "src/objects/code.h"
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namespace v8 {
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namespace internal {
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class Code;
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namespace wasm {
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class WasmCode;
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}
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class CodeReference {
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public:
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CodeReference() : kind_(JS), js_code_() {}
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explicit CodeReference(const wasm::WasmCode* wasm_code)
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: kind_(WASM), wasm_code_(wasm_code) {}
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explicit CodeReference(Handle<Code> js_code) : kind_(JS), js_code_(js_code) {}
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Address constant_pool() const;
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Address instruction_start() const;
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Address instruction_end() const;
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int instruction_size() const;
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const byte* relocation_start() const;
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const byte* relocation_end() const;
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int relocation_size() const;
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bool is_null() const {
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return kind_ == JS ? js_code_.is_null() : wasm_code_ == nullptr;
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}
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Handle<Code> as_js_code() const {
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DCHECK_EQ(JS, kind_);
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return js_code_;
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}
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const wasm::WasmCode* as_wasm_code() const {
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DCHECK_EQ(WASM, kind_);
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return wasm_code_;
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}
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private:
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enum { JS, WASM } kind_;
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union {
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const wasm::WasmCode* wasm_code_;
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Handle<Code> js_code_;
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};
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DISALLOW_NEW_AND_DELETE();
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};
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ASSERT_TRIVIALLY_COPYABLE(CodeReference);
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} // namespace internal
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} // namespace v8
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#endif // V8_CODE_REFERENCE_H_
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