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82 lines
2 KiB
C++
82 lines
2 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#pragma once
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#include "Luau/RegisterX64.h"
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#include "UnwindBuilder.h"
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#include <vector>
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namespace Luau
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{
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namespace CodeGen
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{
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// This struct matches the layout of x64 RUNTIME_FUNCTION from winnt.h
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struct UnwindFunctionWin
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{
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uint32_t beginOffset;
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uint32_t endOffset;
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uint32_t unwindInfoOffset;
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};
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// This struct matches the layout of x64 UNWIND_INFO from ehdata.h
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struct UnwindInfoWin
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{
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uint8_t version : 3;
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uint8_t flags : 5;
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uint8_t prologsize;
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uint8_t unwindcodecount;
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uint8_t framereg : 4;
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uint8_t frameregoff : 4;
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};
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// This struct matches the layout of UNWIND_CODE from ehdata.h
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struct UnwindCodeWin
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{
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uint8_t offset;
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uint8_t opcode : 4;
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uint8_t opinfo : 4;
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};
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class UnwindBuilderWin : public UnwindBuilder
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{
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public:
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void setBeginOffset(size_t beginOffset) override;
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size_t getBeginOffset() const override;
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void startInfo() override;
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void startFunction() override;
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void spill(int espOffset, X64::RegisterX64 reg) override;
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void save(X64::RegisterX64 reg) override;
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void allocStack(int size) override;
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void setupFrameReg(X64::RegisterX64 reg, int espOffset) override;
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void finishFunction(uint32_t beginOffset, uint32_t endOffset) override;
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void finishInfo() override;
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size_t getSize() const override;
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size_t getFunctionCount() const override;
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void finalize(char* target, size_t offset, void* funcAddress, size_t funcSize) const override;
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private:
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size_t beginOffset = 0;
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static const unsigned kRawDataLimit = 1024;
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uint8_t rawData[kRawDataLimit];
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uint8_t* rawDataPos = rawData;
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std::vector<UnwindFunctionWin> unwindFunctions;
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// Windows unwind codes are written in reverse, so we have to collect them all first
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std::vector<UnwindCodeWin> unwindCodes;
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uint8_t prologSize = 0;
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X64::RegisterX64 frameReg = X64::noreg;
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uint8_t frameRegOffset = 0;
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uint32_t stackOffset = 0;
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};
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} // namespace CodeGen
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} // namespace Luau
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