llvm-6502/lib/Target/ARM/ARMMachineFunctionInfo.h
Evan Cheng ac096808a3 Re-apply r110655 with fixes. Epilogue must restore sp from fp if the function stack frame has a var-sized object.
Also added a test case to check for the added benefit of this patch: it's optimizing away the unnecessary restore of sp from fp for some non-leaf functions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110707 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-10 19:30:19 +00:00

251 lines
7.9 KiB
C++

//====- ARMMachineFuctionInfo.h - ARM machine function info -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares ARM-specific per-machine-function information.
//
//===----------------------------------------------------------------------===//
#ifndef ARMMACHINEFUNCTIONINFO_H
#define ARMMACHINEFUNCTIONINFO_H
#include "ARMSubtarget.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/ADT/BitVector.h"
namespace llvm {
/// ARMFunctionInfo - This class is derived from MachineFunction private
/// ARM target-specific information for each MachineFunction.
class ARMFunctionInfo : public MachineFunctionInfo {
/// isThumb - True if this function is compiled under Thumb mode.
/// Used to initialized Align, so must precede it.
bool isThumb;
/// hasThumb2 - True if the target architecture supports Thumb2. Do not use
/// to determine if function is compiled under Thumb mode, for that use
/// 'isThumb'.
bool hasThumb2;
/// VarArgsRegSaveSize - Size of the register save area for vararg functions.
///
unsigned VarArgsRegSaveSize;
/// HasStackFrame - True if this function has a stack frame. Set by
/// processFunctionBeforeCalleeSavedScan().
bool HasStackFrame;
/// RestoreSPFromFP - True if epilogue should restore SP from FP. Set by
/// emitPrologue.
bool RestoreSPFromFP;
/// LRSpilledForFarJump - True if the LR register has been for spilled to
/// enable far jump.
bool LRSpilledForFarJump;
/// FramePtrSpillOffset - If HasStackFrame, this records the frame pointer
/// spill stack offset.
unsigned FramePtrSpillOffset;
/// GPRCS1Offset, GPRCS2Offset, DPRCSOffset - Starting offset of callee saved
/// register spills areas. For Mac OS X:
///
/// GPR callee-saved (1) : r4, r5, r6, r7, lr
/// --------------------------------------------
/// GPR callee-saved (2) : r8, r10, r11
/// --------------------------------------------
/// DPR callee-saved : d8 - d15
unsigned GPRCS1Offset;
unsigned GPRCS2Offset;
unsigned DPRCSOffset;
/// GPRCS1Size, GPRCS2Size, DPRCSSize - Sizes of callee saved register spills
/// areas.
unsigned GPRCS1Size;
unsigned GPRCS2Size;
unsigned DPRCSSize;
/// GPRCS1Frames, GPRCS2Frames, DPRCSFrames - Keeps track of frame indices
/// which belong to these spill areas.
BitVector GPRCS1Frames;
BitVector GPRCS2Frames;
BitVector DPRCSFrames;
/// SpilledCSRegs - A BitVector mask of all spilled callee-saved registers.
///
BitVector SpilledCSRegs;
/// JumpTableUId - Unique id for jumptables.
///
unsigned JumpTableUId;
unsigned ConstPoolEntryUId;
/// VarArgsFrameIndex - FrameIndex for start of varargs area.
int VarArgsFrameIndex;
/// HasITBlocks - True if IT blocks have been inserted.
bool HasITBlocks;
public:
ARMFunctionInfo() :
isThumb(false),
hasThumb2(false),
VarArgsRegSaveSize(0), HasStackFrame(false), RestoreSPFromFP(false),
LRSpilledForFarJump(false),
FramePtrSpillOffset(0), GPRCS1Offset(0), GPRCS2Offset(0), DPRCSOffset(0),
GPRCS1Size(0), GPRCS2Size(0), DPRCSSize(0),
GPRCS1Frames(0), GPRCS2Frames(0), DPRCSFrames(0),
JumpTableUId(0), ConstPoolEntryUId(0), VarArgsFrameIndex(0),
HasITBlocks(false) {}
explicit ARMFunctionInfo(MachineFunction &MF) :
isThumb(MF.getTarget().getSubtarget<ARMSubtarget>().isThumb()),
hasThumb2(MF.getTarget().getSubtarget<ARMSubtarget>().hasThumb2()),
VarArgsRegSaveSize(0), HasStackFrame(false), RestoreSPFromFP(false),
LRSpilledForFarJump(false),
FramePtrSpillOffset(0), GPRCS1Offset(0), GPRCS2Offset(0), DPRCSOffset(0),
GPRCS1Size(0), GPRCS2Size(0), DPRCSSize(0),
GPRCS1Frames(32), GPRCS2Frames(32), DPRCSFrames(32),
SpilledCSRegs(MF.getTarget().getRegisterInfo()->getNumRegs()),
JumpTableUId(0), ConstPoolEntryUId(0), VarArgsFrameIndex(0),
HasITBlocks(false) {}
bool isThumbFunction() const { return isThumb; }
bool isThumb1OnlyFunction() const { return isThumb && !hasThumb2; }
bool isThumb2Function() const { return isThumb && hasThumb2; }
unsigned getVarArgsRegSaveSize() const { return VarArgsRegSaveSize; }
void setVarArgsRegSaveSize(unsigned s) { VarArgsRegSaveSize = s; }
bool hasStackFrame() const { return HasStackFrame; }
void setHasStackFrame(bool s) { HasStackFrame = s; }
bool shouldRestoreSPFromFP() const { return RestoreSPFromFP; }
void setShouldRestoreSPFromFP(bool s) { RestoreSPFromFP = s; }
bool isLRSpilledForFarJump() const { return LRSpilledForFarJump; }
void setLRIsSpilledForFarJump(bool s) { LRSpilledForFarJump = s; }
unsigned getFramePtrSpillOffset() const { return FramePtrSpillOffset; }
void setFramePtrSpillOffset(unsigned o) { FramePtrSpillOffset = o; }
unsigned getGPRCalleeSavedArea1Offset() const { return GPRCS1Offset; }
unsigned getGPRCalleeSavedArea2Offset() const { return GPRCS2Offset; }
unsigned getDPRCalleeSavedAreaOffset() const { return DPRCSOffset; }
void setGPRCalleeSavedArea1Offset(unsigned o) { GPRCS1Offset = o; }
void setGPRCalleeSavedArea2Offset(unsigned o) { GPRCS2Offset = o; }
void setDPRCalleeSavedAreaOffset(unsigned o) { DPRCSOffset = o; }
unsigned getGPRCalleeSavedArea1Size() const { return GPRCS1Size; }
unsigned getGPRCalleeSavedArea2Size() const { return GPRCS2Size; }
unsigned getDPRCalleeSavedAreaSize() const { return DPRCSSize; }
void setGPRCalleeSavedArea1Size(unsigned s) { GPRCS1Size = s; }
void setGPRCalleeSavedArea2Size(unsigned s) { GPRCS2Size = s; }
void setDPRCalleeSavedAreaSize(unsigned s) { DPRCSSize = s; }
bool isGPRCalleeSavedArea1Frame(int fi) const {
if (fi < 0 || fi >= (int)GPRCS1Frames.size())
return false;
return GPRCS1Frames[fi];
}
bool isGPRCalleeSavedArea2Frame(int fi) const {
if (fi < 0 || fi >= (int)GPRCS2Frames.size())
return false;
return GPRCS2Frames[fi];
}
bool isDPRCalleeSavedAreaFrame(int fi) const {
if (fi < 0 || fi >= (int)DPRCSFrames.size())
return false;
return DPRCSFrames[fi];
}
void addGPRCalleeSavedArea1Frame(int fi) {
if (fi >= 0) {
int Size = GPRCS1Frames.size();
if (fi >= Size) {
Size *= 2;
if (fi >= Size)
Size = fi+1;
GPRCS1Frames.resize(Size);
}
GPRCS1Frames[fi] = true;
}
}
void addGPRCalleeSavedArea2Frame(int fi) {
if (fi >= 0) {
int Size = GPRCS2Frames.size();
if (fi >= Size) {
Size *= 2;
if (fi >= Size)
Size = fi+1;
GPRCS2Frames.resize(Size);
}
GPRCS2Frames[fi] = true;
}
}
void addDPRCalleeSavedAreaFrame(int fi) {
if (fi >= 0) {
int Size = DPRCSFrames.size();
if (fi >= Size) {
Size *= 2;
if (fi >= Size)
Size = fi+1;
DPRCSFrames.resize(Size);
}
DPRCSFrames[fi] = true;
}
}
void setCSRegisterIsSpilled(unsigned Reg) {
SpilledCSRegs.set(Reg);
}
bool isCSRegisterSpilled(unsigned Reg) const {
return SpilledCSRegs[Reg];
}
const BitVector &getSpilledCSRegisters() const {
return SpilledCSRegs;
}
unsigned createJumpTableUId() {
return JumpTableUId++;
}
unsigned getNumJumpTables() const {
return JumpTableUId;
}
void initConstPoolEntryUId(unsigned UId) {
ConstPoolEntryUId = UId;
}
unsigned getNumConstPoolEntries() const {
return ConstPoolEntryUId;
}
unsigned createConstPoolEntryUId() {
return ConstPoolEntryUId++;
}
int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
bool hasITBlocks() const { return HasITBlocks; }
void setHasITBlocks(bool h) { HasITBlocks = h; }
};
} // End llvm namespace
#endif // ARMMACHINEFUNCTIONINFO_H