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78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
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// 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/AssemblyBuilderA64.h"
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#include "EmitCommon.h"
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#include "lobject.h"
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#include "ltm.h"
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// AArch64 ABI reminder:
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// Arguments: x0-x7, v0-v7
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// Return: x0, v0 (or x8 that points to the address of the resulting structure)
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// Volatile: x9-x14, v16-v31 ("caller-saved", any call may change them)
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// Non-volatile: x19-x28, v8-v15 ("callee-saved", preserved after calls, only bottom half of SIMD registers is preserved!)
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// Reserved: x16-x18: reserved for linker/platform use; x29: frame pointer (unless omitted); x30: link register; x31: stack pointer
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namespace Luau
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{
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namespace CodeGen
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{
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struct NativeState;
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namespace A64
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{
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// Data that is very common to access is placed in non-volatile registers
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constexpr RegisterA64 rState = x19; // lua_State* L
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constexpr RegisterA64 rBase = x20; // StkId base
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constexpr RegisterA64 rNativeContext = x21; // NativeContext* context
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constexpr RegisterA64 rConstants = x22; // TValue* k
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constexpr RegisterA64 rClosure = x23; // Closure* cl
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constexpr RegisterA64 rCode = x24; // Instruction* code
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// Native code is as stackless as the interpreter, so we can place some data on the stack once and have it accessible at any point
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// See CodeGenA64.cpp for layout
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constexpr unsigned kStackSize = 64; // 8 stashed registers
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inline AddressA64 luauReg(int ri)
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{
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return mem(rBase, ri * sizeof(TValue));
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}
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inline AddressA64 luauRegValue(int ri)
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{
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return mem(rBase, ri * sizeof(TValue) + offsetof(TValue, value));
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}
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inline AddressA64 luauRegTag(int ri)
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{
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return mem(rBase, ri * sizeof(TValue) + offsetof(TValue, tt));
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}
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inline AddressA64 luauConstant(int ki)
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{
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return mem(rConstants, ki * sizeof(TValue));
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}
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inline AddressA64 luauConstantTag(int ki)
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{
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return mem(rConstants, ki * sizeof(TValue) + offsetof(TValue, tt));
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}
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inline AddressA64 luauConstantValue(int ki)
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{
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return mem(rConstants, ki * sizeof(TValue) + offsetof(TValue, value));
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}
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void emitExit(AssemblyBuilderA64& build, bool continueInVm);
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void emitUpdateBase(AssemblyBuilderA64& build);
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void emitSetSavedPc(AssemblyBuilderA64& build, int pcpos); // invalidates x0/x1
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void emitInterrupt(AssemblyBuilderA64& build, int pcpos);
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} // namespace A64
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} // namespace CodeGen
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} // namespace Luau
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