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We were not adjusting the frame size to ensure proper alignment when alloca /

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vla are present in the function. This causes a crash when a leaf function
allocates space on the stack used to store / load with 128-bit SSE
instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27698 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-04-14 07:26:43 +00:00
parent 4f51d850da
commit d9245ca1a1
1 changed files with 23 additions and 30 deletions
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53
lib/Target/X86/X86RegisterInfo.cpp
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@ -573,17 +573,34 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
// Get the number of bytes to allocate from the FrameInfo
unsigned NumBytes = MFI->getStackSize();
if (MFI->hasCalls() || MF.getFrameInfo()->hasVarSizedObjects()) {
// When we have no frame pointer, we reserve argument space for call sites
// in the function immediately on entry to the current function. This
// eliminates the need for add/sub ESP brackets around call sites.
//
if (!hasFP(MF))
NumBytes += MFI->getMaxCallFrameSize();
// Round the size to a multiple of the alignment (don't forget the 4 byte
// offset though).
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
NumBytes = ((NumBytes+4)+Align-1)/Align*Align - 4;
}
// Update frame info to pretend that this is part of the stack...
MFI->setStackSize(NumBytes);
if (NumBytes) { // adjust stack pointer: ESP -= numbytes
unsigned Opc = NumBytes < 128 ? X86::SUB32ri8 : X86::SUB32ri;
MI = BuildMI(Opc, 1, X86::ESP,MachineOperand::UseAndDef).addImm(NumBytes);
MBB.insert(MBBI, MI);
}
if (hasFP(MF)) {
// Get the offset of the stack slot for the EBP register... which is
// guaranteed to be the last slot by processFunctionBeforeFrameFinalized.
int EBPOffset = MFI->getObjectOffset(MFI->getObjectIndexBegin())+4;
if (NumBytes) { // adjust stack pointer: ESP -= numbytes
unsigned Opc = NumBytes < 128 ? X86::SUB32ri8 : X86::SUB32ri;
MI = BuildMI(Opc, 1, X86::ESP,MachineOperand::UseAndDef).addImm(NumBytes);
MBB.insert(MBBI, MI);
}
// Save EBP into the appropriate stack slot...
MI = addRegOffset(BuildMI(X86::MOV32mr, 5), // mov [ESP-<offset>], EBP
X86::ESP, EBPOffset+NumBytes).addReg(X86::EBP);
@ -596,30 +613,6 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MI = addRegOffset(BuildMI(X86::LEA32r, 5, X86::EBP), X86::ESP,NumBytes-4);
MBB.insert(MBBI, MI);
} else {
if (MFI->hasCalls()) {
// When we have no frame pointer, we reserve argument space for call sites
// in the function immediately on entry to the current function. This
// eliminates the need for add/sub ESP brackets around call sites.
//
NumBytes += MFI->getMaxCallFrameSize();
// Round the size to a multiple of the alignment (don't forget the 4 byte
// offset though).
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
NumBytes = ((NumBytes+4)+Align-1)/Align*Align - 4;
}
// Update frame info to pretend that this is part of the stack...
MFI->setStackSize(NumBytes);
if (NumBytes) {
// adjust stack pointer: ESP -= numbytes
unsigned Opc = NumBytes < 128 ? X86::SUB32ri8 : X86::SUB32ri;
MI= BuildMI(Opc, 1, X86::ESP, MachineOperand::UseAndDef).addImm(NumBytes);
MBB.insert(MBBI, MI);
}
}
}