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If -fomit-frame-pointer is used, we still need to record when the %esp register

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is modified. Otherwise, the unwinder will get confused. The old code (before I
started my hacking) did this. It dropped on the floor, because I wasn't aware of
this requirement.

On the plus side, if we use "alloca" in a function, we create frame pointers
even with -fomit-frame-pointer is enabled!

This is a Good Thing(tm)!!!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75183 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2009-07-09 22:30:02 +00:00
parent 5c874172ac
commit d15f45f53e
1 changed files with 20 additions and 1 deletions
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21
lib/Target/X86/X86RegisterInfo.cpp
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@ -873,7 +873,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
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, FramePtr);
emitCalleeSavedFrameMoves(MF, LabelId, HasFP ? FramePtr : StackPtr);
}
if (MBBI != MBB.end())
@ -931,6 +931,25 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
if (NumBytes)
emitSPUpdate(MBB, MBBI, StackPtr, -(int64_t)NumBytes, Is64Bit, TII);
}
if (!HasFP && needsFrameMoves && NumBytes) {
// Mark end of stack pointer adjustment.
unsigned LabelId = MMI->NextLabelID();
BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(LabelId);
// Define the current CFA rule to use the provided offset.
if (StackSize) {
MachineLocation SPDst(MachineLocation::VirtualFP);
MachineLocation SPSrc(MachineLocation::VirtualFP,
-StackSize + stackGrowth);
Moves.push_back(MachineMove(LabelId, SPDst, SPSrc));
} else {
// FIXME: Verify & implement for FP
MachineLocation SPDst(StackPtr);
MachineLocation SPSrc(StackPtr, stackGrowth);
Moves.push_back(MachineMove(LabelId, SPDst, SPSrc));
}
}
}
void X86RegisterInfo::emitEpilogue(MachineFunction &MF,