AArch64MachineFunctionInfo.h revision 249259
1249259Sdim//=- AArch64MachineFuctionInfo.h - AArch64 machine function info -*- C++ -*-==// 2249259Sdim// 3249259Sdim// The LLVM Compiler Infrastructure 4249259Sdim// 5249259Sdim// This file is distributed under the University of Illinois Open Source 6249259Sdim// License. See LICENSE.TXT for details. 7249259Sdim// 8249259Sdim//===----------------------------------------------------------------------===// 9249259Sdim// 10249259Sdim// This file declares AArch64-specific per-machine-function information. 11249259Sdim// 12249259Sdim//===----------------------------------------------------------------------===// 13249259Sdim 14249259Sdim#ifndef AARCH64MACHINEFUNCTIONINFO_H 15249259Sdim#define AARCH64MACHINEFUNCTIONINFO_H 16249259Sdim 17249259Sdim#include "llvm/CodeGen/MachineFunction.h" 18249259Sdim 19249259Sdimnamespace llvm { 20249259Sdim 21249259Sdim/// This class is derived from MachineFunctionInfo and contains private AArch64 22249259Sdim/// target-specific information for each MachineFunction. 23249259Sdimclass AArch64MachineFunctionInfo : public MachineFunctionInfo { 24249259Sdim virtual void anchor(); 25249259Sdim 26249259Sdim /// Number of bytes of arguments this function has on the stack. If the callee 27249259Sdim /// is expected to restore the argument stack this should be a multiple of 16, 28249259Sdim /// all usable during a tail call. 29249259Sdim /// 30249259Sdim /// The alternative would forbid tail call optimisation in some cases: if we 31249259Sdim /// want to transfer control from a function with 8-bytes of stack-argument 32249259Sdim /// space to a function with 16-bytes then misalignment of this value would 33249259Sdim /// make a stack adjustment necessary, which could not be undone by the 34249259Sdim /// callee. 35249259Sdim unsigned BytesInStackArgArea; 36249259Sdim 37249259Sdim /// The number of bytes to restore to deallocate space for incoming 38249259Sdim /// arguments. Canonically 0 in the C calling convention, but non-zero when 39249259Sdim /// callee is expected to pop the args. 40249259Sdim unsigned ArgumentStackToRestore; 41249259Sdim 42249259Sdim /// If the stack needs to be adjusted on frame entry in two stages, this 43249259Sdim /// records the size of the first adjustment just prior to storing 44249259Sdim /// callee-saved registers. The callee-saved slots are addressed assuming 45249259Sdim /// SP == <incoming-SP> - InitialStackAdjust. 46249259Sdim unsigned InitialStackAdjust; 47249259Sdim 48249259Sdim /// Number of local-dynamic TLS accesses. 49249259Sdim unsigned NumLocalDynamics; 50249259Sdim 51249259Sdim /// @see AArch64 Procedure Call Standard, B.3 52249259Sdim /// 53249259Sdim /// The Frame index of the area where LowerFormalArguments puts the 54249259Sdim /// general-purpose registers that might contain variadic parameters. 55249259Sdim int VariadicGPRIdx; 56249259Sdim 57249259Sdim /// @see AArch64 Procedure Call Standard, B.3 58249259Sdim /// 59249259Sdim /// The size of the frame object used to store the general-purpose registers 60249259Sdim /// which might contain variadic arguments. This is the offset from 61249259Sdim /// VariadicGPRIdx to what's stored in __gr_top. 62249259Sdim unsigned VariadicGPRSize; 63249259Sdim 64249259Sdim /// @see AArch64 Procedure Call Standard, B.3 65249259Sdim /// 66249259Sdim /// The Frame index of the area where LowerFormalArguments puts the 67249259Sdim /// floating-point registers that might contain variadic parameters. 68249259Sdim int VariadicFPRIdx; 69249259Sdim 70249259Sdim /// @see AArch64 Procedure Call Standard, B.3 71249259Sdim /// 72249259Sdim /// The size of the frame object used to store the floating-point registers 73249259Sdim /// which might contain variadic arguments. This is the offset from 74249259Sdim /// VariadicFPRIdx to what's stored in __vr_top. 75249259Sdim unsigned VariadicFPRSize; 76249259Sdim 77249259Sdim /// @see AArch64 Procedure Call Standard, B.3 78249259Sdim /// 79249259Sdim /// The Frame index of an object pointing just past the last known stacked 80249259Sdim /// argument on entry to a variadic function. This goes into the __stack field 81249259Sdim /// of the va_list type. 82249259Sdim int VariadicStackIdx; 83249259Sdim 84249259Sdim /// The offset of the frame pointer from the stack pointer on function 85249259Sdim /// entry. This is expected to be negative. 86249259Sdim int FramePointerOffset; 87249259Sdim 88249259Sdimpublic: 89249259Sdim AArch64MachineFunctionInfo() 90249259Sdim : BytesInStackArgArea(0), 91249259Sdim ArgumentStackToRestore(0), 92249259Sdim InitialStackAdjust(0), 93249259Sdim NumLocalDynamics(0), 94249259Sdim VariadicGPRIdx(0), 95249259Sdim VariadicGPRSize(0), 96249259Sdim VariadicFPRIdx(0), 97249259Sdim VariadicFPRSize(0), 98249259Sdim VariadicStackIdx(0), 99249259Sdim FramePointerOffset(0) {} 100249259Sdim 101249259Sdim explicit AArch64MachineFunctionInfo(MachineFunction &MF) 102249259Sdim : BytesInStackArgArea(0), 103249259Sdim ArgumentStackToRestore(0), 104249259Sdim InitialStackAdjust(0), 105249259Sdim NumLocalDynamics(0), 106249259Sdim VariadicGPRIdx(0), 107249259Sdim VariadicGPRSize(0), 108249259Sdim VariadicFPRIdx(0), 109249259Sdim VariadicFPRSize(0), 110249259Sdim VariadicStackIdx(0), 111249259Sdim FramePointerOffset(0) {} 112249259Sdim 113249259Sdim unsigned getBytesInStackArgArea() const { return BytesInStackArgArea; } 114249259Sdim void setBytesInStackArgArea (unsigned bytes) { BytesInStackArgArea = bytes;} 115249259Sdim 116249259Sdim unsigned getArgumentStackToRestore() const { return ArgumentStackToRestore; } 117249259Sdim void setArgumentStackToRestore(unsigned bytes) { 118249259Sdim ArgumentStackToRestore = bytes; 119249259Sdim } 120249259Sdim 121249259Sdim unsigned getInitialStackAdjust() const { return InitialStackAdjust; } 122249259Sdim void setInitialStackAdjust(unsigned bytes) { InitialStackAdjust = bytes; } 123249259Sdim 124249259Sdim unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; } 125249259Sdim void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; } 126249259Sdim 127249259Sdim int getVariadicGPRIdx() const { return VariadicGPRIdx; } 128249259Sdim void setVariadicGPRIdx(int Idx) { VariadicGPRIdx = Idx; } 129249259Sdim 130249259Sdim unsigned getVariadicGPRSize() const { return VariadicGPRSize; } 131249259Sdim void setVariadicGPRSize(unsigned Size) { VariadicGPRSize = Size; } 132249259Sdim 133249259Sdim int getVariadicFPRIdx() const { return VariadicFPRIdx; } 134249259Sdim void setVariadicFPRIdx(int Idx) { VariadicFPRIdx = Idx; } 135249259Sdim 136249259Sdim unsigned getVariadicFPRSize() const { return VariadicFPRSize; } 137249259Sdim void setVariadicFPRSize(unsigned Size) { VariadicFPRSize = Size; } 138249259Sdim 139249259Sdim int getVariadicStackIdx() const { return VariadicStackIdx; } 140249259Sdim void setVariadicStackIdx(int Idx) { VariadicStackIdx = Idx; } 141249259Sdim 142249259Sdim int getFramePointerOffset() const { return FramePointerOffset; } 143249259Sdim void setFramePointerOffset(int Idx) { FramePointerOffset = Idx; } 144249259Sdim 145249259Sdim}; 146249259Sdim 147249259Sdim} // End llvm namespace 148249259Sdim 149249259Sdim#endif 150