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/*
* Copyright (C) 2019-2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "InstructionStream.h"
#include <wtf/SegmentedVector.h>
namespace JSC {
class RegisterID;
template<typename BytecodeGenerator>
class GenericBoundLabel;
template<typename BytecodeGenerator>
class GenericLabel;
template<typename Traits>
class BytecodeGeneratorBase {
template<typename BytecodeGenerator>
friend class GenericBoundLabel;
template<typename BytecodeGenerator>
friend class GenericLabel;
using InstructionStreamWriterType = InstructionStreamWriter<typename Traits::InstructionType>;
using InstructionStreamType = InstructionStream<typename Traits::InstructionType>;
public:
BytecodeGeneratorBase(typename Traits::CodeBlock, uint32_t virtualRegisterCountForCalleeSaves);
void allocateCalleeSaveSpace(uint32_t virtualRegisterCountForCalleeSaves);
Ref<GenericLabel<Traits>> newLabel();
Ref<GenericLabel<Traits>> newEmittedLabel();
RegisterID* newRegister();
RegisterID* addVar();
// Returns the next available temporary register. Registers returned by
// newTemporary require a modified form of reference counting: any
// register with a refcount of 0 is considered "available", meaning that
// the next instruction may overwrite it.
RegisterID* newTemporary();
template<typename Functor>
void newTemporaries(size_t count, const Functor&);
void emitLabel(GenericLabel<Traits>&);
void recordOpcode(typename Traits::OpcodeID);
void alignWideOpcode16();
void alignWideOpcode32();
void write(uint8_t);
void write(uint16_t);
void write(uint32_t);
void write(int8_t);
void write(int16_t);
void write(int32_t);
protected:
void reclaimFreeRegisters();
InstructionStreamWriterType m_writer;
typename Traits::CodeBlock m_codeBlock;
bool m_outOfMemoryDuringConstruction { false };
typename Traits::OpcodeID m_lastOpcodeID = Traits::opcodeForDisablingOptimizations;
typename InstructionStreamType::MutableRef m_lastInstruction { m_writer.ref() };
SegmentedVector<GenericLabel<Traits>, 32> m_labels;
SegmentedVector<RegisterID, 32> m_calleeLocals;
};
} // namespace JSC
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