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;
80 /// HasPushSequences - Keeps track of whether this function uses sequences
81 /// of pushes to pass function parameters.
82 bool HasPushSequences;
85 /// ForwardedMustTailRegParms - A list of virtual and physical registers
86 /// that must be forwarded to every musttail call.
87 SmallVector<ForwardedRegister, 1> ForwardedMustTailRegParms;
90 X86MachineFunctionInfo() : ForceFramePointer(false),
91 RestoreBasePointerOffset(0),
92 CalleeSavedFrameSize(0),
93 BytesToPopOnReturn(0),
95 TailCallReturnAddrDelta(0),
102 ArgumentStackSize(0),
104 HasPushSequences(false) {}
106 explicit X86MachineFunctionInfo(MachineFunction &MF)
107 : ForceFramePointer(false),
108 RestoreBasePointerOffset(0),
109 CalleeSavedFrameSize(0),
110 BytesToPopOnReturn(0),
112 TailCallReturnAddrDelta(0),
115 VarArgsFrameIndex(0),
116 RegSaveFrameIndex(0),
119 ArgumentStackSize(0),
121 HasPushSequences(false) {}
123 bool getForceFramePointer() const { return ForceFramePointer;}
124 void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; }
126 bool getHasPushSequences() const { return HasPushSequences; }
127 void setHasPushSequences(bool HasPush) { HasPushSequences = HasPush; }
129 bool getRestoreBasePointer() const { return RestoreBasePointerOffset!=0; }
130 void setRestoreBasePointer(const MachineFunction *MF);
131 int getRestoreBasePointerOffset() const {return RestoreBasePointerOffset; }
133 unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
134 void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; }
136 unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; }
137 void setBytesToPopOnReturn (unsigned bytes) { BytesToPopOnReturn = bytes;}
139 int getRAIndex() const { return ReturnAddrIndex; }
140 void setRAIndex(int Index) { ReturnAddrIndex = Index; }
142 int getTCReturnAddrDelta() const { return TailCallReturnAddrDelta; }
143 void setTCReturnAddrDelta(int delta) {TailCallReturnAddrDelta = delta;}
145 unsigned getSRetReturnReg() const { return SRetReturnReg; }
146 void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
148 unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
149 void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
151 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
152 void setVarArgsFrameIndex(int Idx) { VarArgsFrameIndex = Idx; }
154 int getRegSaveFrameIndex() const { return RegSaveFrameIndex; }
155 void setRegSaveFrameIndex(int Idx) { RegSaveFrameIndex = Idx; }
157 unsigned getVarArgsGPOffset() const { return VarArgsGPOffset; }
158 void setVarArgsGPOffset(unsigned Offset) { VarArgsGPOffset = Offset; }
160 unsigned getVarArgsFPOffset() const { return VarArgsFPOffset; }
161 void setVarArgsFPOffset(unsigned Offset) { VarArgsFPOffset = Offset; }
163 unsigned getArgumentStackSize() const { return ArgumentStackSize; }
164 void setArgumentStackSize(unsigned size) { ArgumentStackSize = size; }
166 unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; }
167 void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; }
169 SmallVectorImpl<ForwardedRegister> &getForwardedMustTailRegParms() {
170 return ForwardedMustTailRegParms;
174 } // End llvm namespace