1 //===-- X86MachineFuctionInfo.h - X86 machine function info -----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares X86-specific per-machine-function information.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_TARGET_X86_X86MACHINEFUNCTIONINFO_H
15 #define LLVM_LIB_TARGET_X86_X86MACHINEFUNCTIONINFO_H
17 #include "llvm/CodeGen/CallingConvLower.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineValueType.h"
24 /// X86MachineFunctionInfo - This class is derived from MachineFunction and
25 /// contains private X86 target-specific information for each MachineFunction.
26 class X86MachineFunctionInfo : public MachineFunctionInfo {
27 virtual void anchor();
29 /// ForceFramePointer - True if the function is required to use of frame
30 /// pointer for reasons other than it containing dynamic allocation or
31 /// that FP eliminatation is turned off. For example, Cygwin main function
32 /// contains stack pointer re-alignment code which requires FP.
33 bool ForceFramePointer;
35 /// RestoreBasePointerOffset - Non-zero if the function has base pointer
36 /// and makes call to llvm.eh.sjlj.setjmp. When non-zero, the value is a
37 /// displacement from the frame pointer to a slot where the base pointer
39 signed char RestoreBasePointerOffset;
41 /// CalleeSavedFrameSize - Size of the callee-saved register portion of the
42 /// stack frame in bytes.
43 unsigned CalleeSavedFrameSize;
45 /// BytesToPopOnReturn - Number of bytes function pops on return (in addition
46 /// to the space used by the return address).
47 /// Used on windows platform for stdcall & fastcall name decoration
48 unsigned BytesToPopOnReturn;
50 /// ReturnAddrIndex - FrameIndex for return slot.
53 /// TailCallReturnAddrDelta - The number of bytes by which return address
54 /// stack slot is moved as the result of tail call optimization.
55 int TailCallReturnAddrDelta;
57 /// SRetReturnReg - Some subtargets require that sret lowering includes
58 /// returning the value of the returned struct in a register. This field
59 /// holds the virtual register into which the sret argument is passed.
60 unsigned SRetReturnReg;
62 /// GlobalBaseReg - keeps track of the virtual register initialized for
63 /// use as the global base register. This is used for PIC in some PIC
64 /// relocation models.
65 unsigned GlobalBaseReg;
67 /// VarArgsFrameIndex - FrameIndex for start of varargs area.
68 int VarArgsFrameIndex;
69 /// RegSaveFrameIndex - X86-64 vararg func register save area.
70 int RegSaveFrameIndex;
71 /// VarArgsGPOffset - X86-64 vararg func int reg offset.
72 unsigned VarArgsGPOffset;
73 /// VarArgsFPOffset - X86-64 vararg func fp reg offset.
74 unsigned VarArgsFPOffset;
75 /// ArgumentStackSize - The number of bytes on stack consumed by the arguments
76 /// being passed on the stack.
77 unsigned ArgumentStackSize;
78 /// NumLocalDynamics - Number of local-dynamic TLS accesses.
79 unsigned NumLocalDynamics;
82 /// ForwardedMustTailRegParms - A list of virtual and physical registers
83 /// that must be forwarded to every musttail call.
84 SmallVector<ForwardedRegister, 1> ForwardedMustTailRegParms;
87 X86MachineFunctionInfo() : ForceFramePointer(false),
88 RestoreBasePointerOffset(0),
89 CalleeSavedFrameSize(0),
90 BytesToPopOnReturn(0),
92 TailCallReturnAddrDelta(0),
100 NumLocalDynamics(0) {}
102 explicit X86MachineFunctionInfo(MachineFunction &MF)
103 : ForceFramePointer(false),
104 RestoreBasePointerOffset(0),
105 CalleeSavedFrameSize(0),
106 BytesToPopOnReturn(0),
108 TailCallReturnAddrDelta(0),
111 VarArgsFrameIndex(0),
112 RegSaveFrameIndex(0),
115 ArgumentStackSize(0),
116 NumLocalDynamics(0) {}
118 bool getForceFramePointer() const { return ForceFramePointer;}
119 void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; }
121 bool getRestoreBasePointer() const { return RestoreBasePointerOffset!=0; }
122 void setRestoreBasePointer(const MachineFunction *MF);
123 int getRestoreBasePointerOffset() const {return RestoreBasePointerOffset; }
125 unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
126 void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; }
128 unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; }
129 void setBytesToPopOnReturn (unsigned bytes) { BytesToPopOnReturn = bytes;}
131 int getRAIndex() const { return ReturnAddrIndex; }
132 void setRAIndex(int Index) { ReturnAddrIndex = Index; }
134 int getTCReturnAddrDelta() const { return TailCallReturnAddrDelta; }
135 void setTCReturnAddrDelta(int delta) {TailCallReturnAddrDelta = delta;}
137 unsigned getSRetReturnReg() const { return SRetReturnReg; }
138 void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
140 unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
141 void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
143 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
144 void setVarArgsFrameIndex(int Idx) { VarArgsFrameIndex = Idx; }
146 int getRegSaveFrameIndex() const { return RegSaveFrameIndex; }
147 void setRegSaveFrameIndex(int Idx) { RegSaveFrameIndex = Idx; }
149 unsigned getVarArgsGPOffset() const { return VarArgsGPOffset; }
150 void setVarArgsGPOffset(unsigned Offset) { VarArgsGPOffset = Offset; }
152 unsigned getVarArgsFPOffset() const { return VarArgsFPOffset; }
153 void setVarArgsFPOffset(unsigned Offset) { VarArgsFPOffset = Offset; }
155 unsigned getArgumentStackSize() const { return ArgumentStackSize; }
156 void setArgumentStackSize(unsigned size) { ArgumentStackSize = size; }
158 unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; }
159 void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; }
161 SmallVectorImpl<ForwardedRegister> &getForwardedMustTailRegParms() {
162 return ForwardedMustTailRegParms;
166 } // End llvm namespace