62 lines
1.9 KiB
C++
62 lines
1.9 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/RegisterA64.h"
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#include "Luau/RegisterX64.h"
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#include <initializer_list>
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#include <stddef.h>
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#include <stdint.h>
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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 value is used in 'finishFunction' to mark the function that spans to the end of the whole code block
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static uint32_t kFullBlockFuncton = ~0u;
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class UnwindBuilder
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{
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public:
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enum Arch
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{
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X64,
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A64
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};
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virtual ~UnwindBuilder() = default;
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virtual void setBeginOffset(size_t beginOffset) = 0;
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virtual size_t getBeginOffset() const = 0;
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virtual void startInfo(Arch arch) = 0;
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virtual void startFunction() = 0;
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virtual void finishFunction(uint32_t beginOffset, uint32_t endOffset) = 0;
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virtual void finishInfo() = 0;
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// A64-specific; prologue must look like this:
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// sub sp, sp, stackSize
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// store sequence that saves regs to [sp..sp+regs.size*8) in the order specified in regs; regs should start with x29, x30 (fp, lr)
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// mov x29, sp
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virtual void prologueA64(uint32_t prologueSize, uint32_t stackSize, std::initializer_list<A64::RegisterA64> regs) = 0;
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// X64-specific; prologue must look like this:
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// optional, indicated by setupFrame:
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// push rbp
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// mov rbp, rsp
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// push reg in the order specified in regs
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// sub rsp, stackSize
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virtual void prologueX64(uint32_t prologueSize, uint32_t stackSize, bool setupFrame, std::initializer_list<X64::RegisterX64> regs) = 0;
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virtual size_t getSize() const = 0;
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virtual size_t getFunctionCount() const = 0;
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// This will place the unwinding data at the target address and might update values of some fields
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virtual void finalize(char* target, size_t offset, void* funcAddress, size_t funcSize) const = 0;
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};
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} // namespace CodeGen
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} // namespace Luau
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