ChakraCore/lib/Backend/Encoder.h

//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------
#include "EncoderMD.h"
#include "Backend.h"

///---------------------------------------------------------------------------
///
/// class Encoder
///
///---------------------------------------------------------------------------

typedef JsUtil::List<NativeOffsetInlineeFramePair, ArenaAllocator> InlineeFrameMap;
typedef JsUtil::List<IR::PragmaInstr*, ArenaAllocator> PragmaInstrList;
typedef JsUtil::List<uint32, ArenaAllocator> OffsetList;
typedef JsUtil::List<BranchJumpTableWrapper*, ArenaAllocator> JmpTableList;

class Encoder
{
    friend class EncoderMD;
public:
    Encoder(Func * func) : m_func(func), m_encoderMD(func), m_inlineeFrameMap(nullptr) {}

    void            Encode();
    void            RecordInlineeFrame(Func* inlinee, uint32 currentOffset);
    void            RecordBailout(IR::Instr* instr, uint32 currentOffset);
private:
    bool            DoTrackAllStatementBoundary() const;

    Func *          m_func;
    EncoderMD       m_encoderMD;
    BYTE *          m_encodeBuffer;
    BYTE *          m_pc;
    uint32          m_encodeBufferSize;
    ArenaAllocator *m_tempAlloc;

    InlineeFrameMap* m_inlineeFrameMap;
    typedef JsUtil::List<LazyBailOutRecord, ArenaAllocator> BailoutRecordMap;
    BailoutRecordMap* m_bailoutRecordMap;
#if DBG_DUMP
    void DumpInlineeFrameMap(size_t baseAddress);
    uint32 *        m_offsetBuffer;
    uint32          m_instrNumber;
#endif

    PragmaInstrList     *m_pragmaInstrToRecordOffset;
    PragmaInstrList     *m_pragmaInstrToRecordMap;
#if defined(_M_IX86) || defined(_M_X64)
    InlineeFrameRecords *m_inlineeFrameRecords;

    BOOL            ShortenBranchesAndLabelAlign(BYTE **codeStart, ptrdiff_t *codeSize);
    void            revertRelocList();
    template <bool restore> void  CopyMaps(OffsetList **m_origInlineeFrameRecords, OffsetList **m_origInlineeFrameMap, OffsetList **m_origPragmaInstrToRecordOffset, OffsetList **m_origOffsetBuffer);
#endif
    void            InsertNopsForLabelAlignment(int nopCount, BYTE ** pDstBuffer);
    void            CopyPartialBuffer(BYTE ** ptrDstBuffer, size_t &dstSize, BYTE * srcStart, BYTE * srcEnd);
    BYTE            FindNopCountFor16byteAlignment(size_t address);

    uint32          GetCurrentOffset() const;
    void            TryCopyAndAddRelocRecordsForSwitchJumpTableEntries(BYTE *codeStart, size_t codeSize, JmpTableList * jumpTableListForSwitchStatement, size_t totalJmpTableSizeInBytes);
};