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