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/MachineFunction.h"
18 #include "llvm/CodeGen/MachineValueType.h"
23 /// X86MachineFunctionInfo - This class is derived from MachineFunction and
24 /// contains private X86 target-specific information for each MachineFunction.
25 class X86MachineFunctionInfo : public MachineFunctionInfo {
26 virtual void anchor();
28 /// ForceFramePointer - True if the function is required to use of frame
29 /// pointer for reasons other than it containing dynamic allocation or
30 /// that FP eliminatation is turned off. For example, Cygwin main function
31 /// contains stack pointer re-alignment code which requires FP.
32 bool ForceFramePointer;
34 /// RestoreBasePointerOffset - Non-zero if the function has base pointer
35 /// and makes call to llvm.eh.sjlj.setjmp. When non-zero, the value is a
36 /// displacement from the frame pointer to a slot where the base pointer
38 signed char RestoreBasePointerOffset;
40 /// CalleeSavedFrameSize - Size of the callee-saved register portion of the
41 /// stack frame in bytes.
42 unsigned CalleeSavedFrameSize;
44 /// BytesToPopOnReturn - Number of bytes function pops on return (in addition
45 /// to the space used by the return address).
46 /// Used on windows platform for stdcall & fastcall name decoration
47 unsigned BytesToPopOnReturn;
49 /// ReturnAddrIndex - FrameIndex for return slot.
52 /// TailCallReturnAddrDelta - The number of bytes by which return address
53 /// stack slot is moved as the result of tail call optimization.
54 int TailCallReturnAddrDelta;
56 /// SRetReturnReg - Some subtargets require that sret lowering includes
57 /// returning the value of the returned struct in a register. This field
58 /// holds the virtual register into which the sret argument is passed.
59 unsigned SRetReturnReg;
61 /// GlobalBaseReg - keeps track of the virtual register initialized for
62 /// use as the global base register. This is used for PIC in some PIC
63 /// relocation models.
64 unsigned GlobalBaseReg;
66 /// VarArgsFrameIndex - FrameIndex for start of varargs area.
67 int VarArgsFrameIndex;
68 /// RegSaveFrameIndex - X86-64 vararg func register save area.
69 int RegSaveFrameIndex;
70 /// VarArgsGPOffset - X86-64 vararg func int reg offset.
71 unsigned VarArgsGPOffset;
72 /// VarArgsFPOffset - X86-64 vararg func fp reg offset.
73 unsigned VarArgsFPOffset;
74 /// ArgumentStackSize - The number of bytes on stack consumed by the arguments
75 /// being passed on the stack.
76 unsigned ArgumentStackSize;
77 /// NumLocalDynamics - Number of local-dynamic TLS accesses.
78 unsigned NumLocalDynamics;
81 /// Describes a register that needs to be forwarded from the prologue to a
84 Forward(unsigned VReg, MCPhysReg PReg, MVT VT)
85 : VReg(VReg), PReg(PReg), VT(VT) {}
92 /// ForwardedMustTailRegParms - A list of virtual and physical registers
93 /// that must be forwarded to every musttail call.
94 std::vector<Forward> ForwardedMustTailRegParms;
97 X86MachineFunctionInfo() : ForceFramePointer(false),
98 RestoreBasePointerOffset(0),
99 CalleeSavedFrameSize(0),
100 BytesToPopOnReturn(0),
102 TailCallReturnAddrDelta(0),
105 VarArgsFrameIndex(0),
106 RegSaveFrameIndex(0),
109 ArgumentStackSize(0),
110 NumLocalDynamics(0) {}
112 explicit X86MachineFunctionInfo(MachineFunction &MF)
113 : ForceFramePointer(false),
114 RestoreBasePointerOffset(0),
115 CalleeSavedFrameSize(0),
116 BytesToPopOnReturn(0),
118 TailCallReturnAddrDelta(0),
121 VarArgsFrameIndex(0),
122 RegSaveFrameIndex(0),
125 ArgumentStackSize(0),
126 NumLocalDynamics(0) {}
128 bool getForceFramePointer() const { return ForceFramePointer;}
129 void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; }
131 bool getRestoreBasePointer() const { return RestoreBasePointerOffset!=0; }
132 void setRestoreBasePointer(const MachineFunction *MF);
133 int getRestoreBasePointerOffset() const {return RestoreBasePointerOffset; }
135 unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
136 void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; }
138 unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; }
139 void setBytesToPopOnReturn (unsigned bytes) { BytesToPopOnReturn = bytes;}
141 int getRAIndex() const { return ReturnAddrIndex; }
142 void setRAIndex(int Index) { ReturnAddrIndex = Index; }
144 int getTCReturnAddrDelta() const { return TailCallReturnAddrDelta; }
145 void setTCReturnAddrDelta(int delta) {TailCallReturnAddrDelta = delta;}
147 unsigned getSRetReturnReg() const { return SRetReturnReg; }
148 void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
150 unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
151 void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
153 int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
154 void setVarArgsFrameIndex(int Idx) { VarArgsFrameIndex = Idx; }
156 int getRegSaveFrameIndex() const { return RegSaveFrameIndex; }
157 void setRegSaveFrameIndex(int Idx) { RegSaveFrameIndex = Idx; }
159 unsigned getVarArgsGPOffset() const { return VarArgsGPOffset; }
160 void setVarArgsGPOffset(unsigned Offset) { VarArgsGPOffset = Offset; }
162 unsigned getVarArgsFPOffset() const { return VarArgsFPOffset; }
163 void setVarArgsFPOffset(unsigned Offset) { VarArgsFPOffset = Offset; }
165 unsigned getArgumentStackSize() const { return ArgumentStackSize; }
166 void setArgumentStackSize(unsigned size) { ArgumentStackSize = size; }
168 unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; }
169 void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; }
171 std::vector<Forward> &getForwardedMustTailRegParms() {
172 return ForwardedMustTailRegParms;
176 } // End llvm namespace