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Move some more hooks to TargetFrameInfo

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119904 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2010-11-20 15:59:32 +00:00
parent 3ca136312a
commit 82f58740c7
18 changed files with 201 additions and 192 deletions
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90
lib/Target/ARM/ARMFrameInfo.cpp
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@@ -383,3 +383,93 @@ void ARMFrameInfo::emitEpilogue(MachineFunction &MF,
if (VARegSaveSize)
emitSPUpdate(isARM, MBB, MBBI, dl, TII, VARegSaveSize);
}
// Provide a base+offset reference to an FI slot for debug info. It's the
// same as what we use for resolving the code-gen references for now.
// FIXME: This can go wrong when references are SP-relative and simple call
// frames aren't used.
int
ARMFrameInfo::getFrameIndexReference(const MachineFunction &MF, int FI,
unsigned &FrameReg) const {
return ResolveFrameIndexReference(MF, FI, FrameReg, 0);
}
int
ARMFrameInfo::ResolveFrameIndexReference(const MachineFunction &MF,
int FI,
unsigned &FrameReg,
int SPAdj) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
const ARMBaseRegisterInfo *RegInfo =
static_cast<const ARMBaseRegisterInfo*>(MF.getTarget().getRegisterInfo());
const ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
int Offset = MFI->getObjectOffset(FI) + MFI->getStackSize();
int FPOffset = Offset - AFI->getFramePtrSpillOffset();
bool isFixed = MFI->isFixedObjectIndex(FI);
FrameReg = ARM::SP;
Offset += SPAdj;
if (AFI->isGPRCalleeSavedArea1Frame(FI))
return Offset - AFI->getGPRCalleeSavedArea1Offset();
else if (AFI->isGPRCalleeSavedArea2Frame(FI))
return Offset - AFI->getGPRCalleeSavedArea2Offset();
else if (AFI->isDPRCalleeSavedAreaFrame(FI))
return Offset - AFI->getDPRCalleeSavedAreaOffset();
// When dynamically realigning the stack, use the frame pointer for
// parameters, and the stack/base pointer for locals.
if (RegInfo->needsStackRealignment(MF)) {
assert (hasFP(MF) && "dynamic stack realignment without a FP!");
if (isFixed) {
FrameReg = RegInfo->getFrameRegister(MF);
Offset = FPOffset;
} else if (MFI->hasVarSizedObjects()) {
assert(RegInfo->hasBasePointer(MF) &&
"VLAs and dynamic stack alignment, but missing base pointer!");
FrameReg = RegInfo->getBaseRegister();
}
return Offset;
}
// If there is a frame pointer, use it when we can.
if (hasFP(MF) && AFI->hasStackFrame()) {
// Use frame pointer to reference fixed objects. Use it for locals if
// there are VLAs (and thus the SP isn't reliable as a base).
if (isFixed || (MFI->hasVarSizedObjects() && !RegInfo->hasBasePointer(MF))) {
FrameReg = RegInfo->getFrameRegister(MF);
return FPOffset;
} else if (MFI->hasVarSizedObjects()) {
assert(RegInfo->hasBasePointer(MF) && "missing base pointer!");
// Try to use the frame pointer if we can, else use the base pointer
// since it's available. This is handy for the emergency spill slot, in
// particular.
if (AFI->isThumb2Function()) {
if (FPOffset >= -255 && FPOffset < 0) {
FrameReg = RegInfo->getFrameRegister(MF);
return FPOffset;
}
} else
FrameReg = RegInfo->getBaseRegister();
} else if (AFI->isThumb2Function()) {
// In Thumb2 mode, the negative offset is very limited. Try to avoid
// out of range references.
if (FPOffset >= -255 && FPOffset < 0) {
FrameReg = RegInfo->getFrameRegister(MF);
return FPOffset;
}
} else if (Offset > (FPOffset < 0 ? -FPOffset : FPOffset)) {
// Otherwise, use SP or FP, whichever is closer to the stack slot.
FrameReg = RegInfo->getFrameRegister(MF);
return FPOffset;
}
}
// Use the base pointer if we have one.
if (RegInfo->hasBasePointer(MF))
FrameReg = RegInfo->getBaseRegister();
return Offset;
}
int ARMFrameInfo::getFrameIndexOffset(const MachineFunction &MF, int FI) const {
unsigned FrameReg;
return getFrameIndexReference(MF, FI, FrameReg);
}