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--- Reverse-merging (from foreign repository) r74952 into '.':

Browse Source 
U    lib/Target/X86/X86RegisterInfo.cpp
U    lib/Target/X86/X86RegisterInfo.h

Temporarily revert. This was causing an infinite loop in the linker on Leopard.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74970 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2009-07-07 23:37:49 +00:00
parent a4f7318245
commit 97b4d4a8b5
2 changed files with 70 additions and 76 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

142
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -644,16 +644,15 @@ static int mergeSPUpdates(MachineBasicBlock &MBB,
return Offset;
}
void X86RegisterInfo::emitCalleeSavedFrameMoves(MachineFunction &MF,
unsigned LabelId) const {
void X86RegisterInfo::emitFrameMoves(MachineFunction &MF,
unsigned FrameLabelId,
unsigned ReadyLabelId) const {
MachineFrameInfo *MFI = MF.getFrameInfo();
MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
if (!MMI) return;
// Add callee saved registers to move list.
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
if (CSI.empty()) return;
if (!MMI)
return;
uint64_t StackSize = MFI->getStackSize();
std::vector<MachineMove> &Moves = MMI->getFrameMoves();
const TargetData *TD = MF.getTarget().getTargetData();
@ -663,30 +662,62 @@ void X86RegisterInfo::emitCalleeSavedFrameMoves(MachineFunction &MF,
TargetFrameInfo::StackGrowsUp ?
TD->getPointerSize() : -TD->getPointerSize());
MachineLocation FPDst(hasFP(MF) ? FramePtr : StackPtr);
MachineLocation FPSrc(MachineLocation::VirtualFP);
Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
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 (std::vector<CalleeSavedInfo>::const_iterator
I = CSI.begin(), E = CSI.end(); I != E; ++I)
for (unsigned I = 0, E = CSI.size(); I!=E; ++I)
MaxOffset = std::min(MaxOffset,
MFI->getObjectOffset(I->getFrameIdx()));
// Calculate offsets.
int64_t saveAreaOffset = (hasFP(MF) ? 3 : 2) * stackGrowth;
for (std::vector<CalleeSavedInfo>::const_iterator
I = CSI.begin(), E = CSI.end(); I != E; ++I) {
int64_t Offset = MFI->getObjectOffset(I->getFrameIdx());
unsigned Reg = I->getReg();
Offset = MaxOffset - Offset + saveAreaOffset;
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(LabelId, CSDst, CSSrc));
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));
}
}
void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineFrameInfo *MFI = MF.getFrameInfo();
@ -698,9 +729,11 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
bool needsFrameMoves = (MMI && MMI->hasDebugInfo()) ||
!Fn->doesNotThrow() ||
UnwindTablesMandatory;
bool HasFP = hasFP(MF);
DebugLoc DL;
// Prepare for frame info.
unsigned FrameLabelId = 0;
// Get the number of bytes to allocate from the FrameInfo.
uint64_t StackSize = MFI->getStackSize();
@ -724,7 +757,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
!MFI->hasCalls() && // No calls.
!Subtarget->isTargetWin64()) { // Win64 has no Red Zone
uint64_t MinSize = X86FI->getCalleeSavedFrameSize();
if (HasFP) MinSize += SlotSize;
if (hasFP(MF)) MinSize += SlotSize;
StackSize = std::max(MinSize,
StackSize > 128 ? StackSize - 128 : 0);
MFI->setStackSize(StackSize);
@ -741,16 +774,8 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MI->getOperand(3).setIsDead();
}
// uint64_t StackSize = MFI->getStackSize();
std::vector<MachineMove> &Moves = MMI->getFrameMoves();
const TargetData *TD = MF.getTarget().getTargetData();
int stackGrowth =
(MF.getTarget().getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
TD->getPointerSize() : -TD->getPointerSize());
uint64_t NumBytes = 0;
if (HasFP) {
if (hasFP(MF)) {
// Calculate required stack adjustment
uint64_t FrameSize = StackSize - SlotSize;
if (needsStackRealignment(MF))
@ -758,38 +783,19 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
NumBytes = FrameSize - X86FI->getCalleeSavedFrameSize();
// Get the offset of the stack slot for the EBP register, which is
// Get the offset of the stack slot for the EBP register... which is
// guaranteed to be the last slot by processFunctionBeforeFrameFinalized.
// Update the frame offset adjustment.
MFI->setOffsetAdjustment(-NumBytes);
// Save EBP/RBP into the appropriate stack slot...
// Save EBP into the appropriate stack slot...
BuildMI(MBB, MBBI, DL, TII.get(Is64Bit ? X86::PUSH64r : X86::PUSH32r))
.addReg(FramePtr, RegState::Kill);
if (needsFrameMoves) {
// Mark effective beginning of when frame pointer becomes valid.
unsigned FrameLabelId = MMI->NextLabelID();
FrameLabelId = MMI->NextLabelID();
BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(FrameLabelId);
// Define the current CFA rule to use the provided offset.
if (StackSize) {
MachineLocation SPDst(MachineLocation::VirtualFP);
MachineLocation SPSrc(MachineLocation::VirtualFP,
HasFP ? 2 * stackGrowth :
-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));
}
// Change the rule for the FramePtr to be an "offset" rule.
MachineLocation FPDst(MachineLocation::VirtualFP, 2 * stackGrowth);
MachineLocation FPSrc(FramePtr);
Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc));
}
// Update EBP with the new base value...
@ -797,16 +803,6 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), FramePtr)
.addReg(StackPtr);
if (needsFrameMoves) {
unsigned FrameLabelId = MMI->NextLabelID();
BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(FrameLabelId);
// Define the current CFA to use the EBP/RBP register.
MachineLocation FPDst(FramePtr);
MachineLocation FPSrc(MachineLocation::VirtualFP);
Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc));
}
// Mark the FramePtr as live-in in every block except the entry.
for (MachineFunction::iterator I = next(MF.begin()), E = MF.end();
I != E; ++I)
@ -826,22 +822,10 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
}
// Skip the callee-saved push instructions.
bool RegsSaved = false;
while (MBBI != MBB.end() &&
(MBBI->getOpcode() == X86::PUSH32r ||
MBBI->getOpcode() == X86::PUSH64r)) {
RegsSaved = true;
MBBI->getOpcode() == X86::PUSH64r))
++MBBI;
}
if (RegsSaved && needsFrameMoves) {
// Mark end of callee-saved push instructions.
unsigned LabelId = MMI->NextLabelID();
BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(LabelId);
// Emit DWARF info specifying the offsets of the callee-saved registers.
emitCalleeSavedFrameMoves(MF, LabelId);
}
if (MBBI != MBB.end())
DL = MBBI->getDebugLoc();
@ -898,6 +882,14 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
if (NumBytes)
emitSPUpdate(MBB, MBBI, StackPtr, -(int64_t)NumBytes, Is64Bit, TII);
}
if (needsFrameMoves) {
unsigned ReadyLabelId = 0;
// Mark effective beginning of when frame pointer is ready.
ReadyLabelId = MMI->NextLabelID();
BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(ReadyLabelId);
emitFrameMoves(MF, FrameLabelId, ReadyLabelId);
}
}
void X86RegisterInfo::emitEpilogue(MachineFunction &MF,

4
lib/Target/X86/X86RegisterInfo.h
View File

@ -136,10 +136,12 @@ public:
void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS = NULL) const;
void emitCalleeSavedFrameMoves(MachineFunction &MF, unsigned LabelId) const;
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;