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Provide convenient helpers for some operations

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50153 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2008-04-23 18:15:48 +00:00
parent e201190eb7
commit 9bbbea568c
2 changed files with 88 additions and 64 deletions
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147
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -258,11 +258,18 @@ bool X86RegisterInfo::hasFP(const MachineFunction &MF) const {
MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
return (NoFramePointerElim ||
needsStackRealignment(MF) ||
MFI->hasVarSizedObjects() ||
MF.getInfo<X86MachineFunctionInfo>()->getForceFramePointer() ||
(MMI && MMI->callsUnwindInit()));
}
bool X86RegisterInfo::needsStackRealignment(const MachineFunction &MF) const {
MachineFrameInfo *MFI = MF.getFrameInfo();;
return (MFI->getMaxAlignment() > StackAlign);
}
bool X86RegisterInfo::hasReservedCallFrame(MachineFunction &MF) const {
return !MF.getFrameInfo()->hasVarSizedObjects();
}
@ -496,6 +503,80 @@ static int mergeSPUpdates(MachineBasicBlock &MBB,
return Offset;
}
void X86RegisterInfo::emitFrameMoves(MachineFunction &MF,
unsigned FrameLabelId,
unsigned ReadyLabelId) const {
MachineFrameInfo *MFI = MF.getFrameInfo();
MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
if (!MMI)
return;
uint64_t StackSize = MFI->getStackSize();
std::vector<MachineMove> &Moves = MMI->getFrameMoves();
const TargetData *TD = MF.getTarget().getTargetData();
// Calculate amount of bytes used for return address storing
int stackGrowth =
(MF.getTarget().getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
TD->getPointerSize() : -TD->getPointerSize());
if (StackSize) {
// Show update of SP.
if (hasFP(MF)) {
// Adjust SP
MachineLocation SPDst(MachineLocation::VirtualFP);
MachineLocation SPSrc(MachineLocation::VirtualFP, 2*stackGrowth);
Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
} else {
MachineLocation SPDst(MachineLocation::VirtualFP);
MachineLocation SPSrc(MachineLocation::VirtualFP,
-StackSize+stackGrowth);
Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
}
} else {
//FIXME: Verify & implement for FP
MachineLocation SPDst(StackPtr);
MachineLocation SPSrc(StackPtr, stackGrowth);
Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
}
// Add callee saved registers to move list.
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
// FIXME: This is dirty hack. The code itself is pretty mess right now.
// It should be rewritten from scratch and generalized sometimes.
// Determine maximum offset (minumum due to stack growth)
int64_t MaxOffset = 0;
for (unsigned I = 0, E = CSI.size(); I!=E; ++I)
MaxOffset = std::min(MaxOffset,
MFI->getObjectOffset(CSI[I].getFrameIdx()));
// Calculate offsets
int64_t saveAreaOffset = (hasFP(MF) ? 3 : 2)*stackGrowth;
for (unsigned I = 0, E = CSI.size(); I!=E; ++I) {
int64_t Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
unsigned Reg = CSI[I].getReg();
Offset = (MaxOffset-Offset+saveAreaOffset);
MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
MachineLocation CSSrc(Reg);
Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc));
}
if (hasFP(MF)) {
// Save FP
MachineLocation FPDst(MachineLocation::VirtualFP, 2*stackGrowth);
MachineLocation FPSrc(FramePtr);
Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
}
MachineLocation FPDst(hasFP(MF) ? FramePtr : StackPtr);
MachineLocation FPSrc(MachineLocation::VirtualFP);
Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
}
void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineFrameInfo *MFI = MF.getFrameInfo();
@ -609,70 +690,8 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
}
}
if (needsFrameMoves) {
std::vector<MachineMove> &Moves = MMI->getFrameMoves();
const TargetData *TD = MF.getTarget().getTargetData();
// Calculate amount of bytes used for return address storing
int stackGrowth =
(MF.getTarget().getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
TD->getPointerSize() : -TD->getPointerSize());
if (StackSize) {
// Show update of SP.
if (hasFP(MF)) {
// Adjust SP
MachineLocation SPDst(MachineLocation::VirtualFP);
MachineLocation SPSrc(MachineLocation::VirtualFP, 2*stackGrowth);
Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
} else {
MachineLocation SPDst(MachineLocation::VirtualFP);
MachineLocation SPSrc(MachineLocation::VirtualFP,
-StackSize+stackGrowth);
Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
}
} else {
//FIXME: Verify & implement for FP
MachineLocation SPDst(StackPtr);
MachineLocation SPSrc(StackPtr, stackGrowth);
Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
}
// Add callee saved registers to move list.
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
// FIXME: This is dirty hack. The code itself is pretty mess right now.
// It should be rewritten from scratch and generalized sometimes.
// Determine maximum offset (minumum due to stack growth)
int64_t MaxOffset = 0;
for (unsigned I = 0, E = CSI.size(); I!=E; ++I)
MaxOffset = std::min(MaxOffset,
MFI->getObjectOffset(CSI[I].getFrameIdx()));
// Calculate offsets
int64_t saveAreaOffset = (hasFP(MF) ? 3 : 2)*stackGrowth;
for (unsigned I = 0, E = CSI.size(); I!=E; ++I) {
int64_t Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
unsigned Reg = CSI[I].getReg();
Offset = (MaxOffset-Offset+saveAreaOffset);
MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
MachineLocation CSSrc(Reg);
Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc));
}
if (hasFP(MF)) {
// Save FP
MachineLocation FPDst(MachineLocation::VirtualFP, 2*stackGrowth);
MachineLocation FPSrc(FramePtr);
Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
}
MachineLocation FPDst(hasFP(MF) ? FramePtr : StackPtr);
MachineLocation FPSrc(MachineLocation::VirtualFP);
Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
}
if (needsFrameMoves)
emitFrameMoves(MF, FrameLabelId, ReadyLabelId);
// If it's main() on Cygwin\Mingw32 we should align stack as well
if (Fn->hasExternalLinkage() && Fn->getName() == "main" &&

5
lib/Target/X86/X86RegisterInfo.h
View File

@ -115,6 +115,8 @@ public:
bool hasFP(const MachineFunction &MF) const;
bool needsStackRealignment(const MachineFunction &MF) const;
bool hasReservedCallFrame(MachineFunction &MF) const;
void eliminateCallFramePseudoInstr(MachineFunction &MF,
@ -129,6 +131,9 @@ public:
void emitPrologue(MachineFunction &MF) const;
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
void emitFrameMoves(MachineFunction &MF,
unsigned FrameLabelId, unsigned ReadyLabelId) const;
// Debug information queries.
unsigned getRARegister() const;
unsigned getFrameRegister(MachineFunction &MF) const;