6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-03 13:31:05 +00:00
Code Issues Projects Releases Wiki Activity

Handle frame offset due to return address pushed on the stack

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5319 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-01-15 22:57:35 +00:00
parent 4ac7d7302b
commit eafa423881
1 changed files with 8 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -138,11 +138,11 @@ void X86RegisterInfo::eliminateFrameIndex(MachineFunction &MF,
// Now add the frame object offset to the offset from EBP.
int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
MI.getOperand(i+3).getImmedValue();
MI.getOperand(i+3).getImmedValue()+4;
if (!hasFP(MF) && hasSPAdjust(MF)) {
const MachineFrameInfo *MFI = MF.getFrameInfo();
Offset += MFI->getStackSize() + MFI->getMaxCallFrameSize();
Offset += MFI->getStackSize();
}
MI.SetMachineOperandConst(i+3, MachineOperand::MO_SignExtendedImmed, Offset);
@ -161,7 +161,7 @@ void X86RegisterInfo::processFunctionBeforeFrameFinalized(MachineFunction &MF)
void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineBasicBlock::iterator MBBI = MBB.begin();
const MachineFrameInfo *MFI = MF.getFrameInfo();
MachineFrameInfo *MFI = MF.getFrameInfo();
MachineInstr *MI;
// Get the number of bytes to allocate from the FrameInfo
@ -169,7 +169,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
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->getObjectIndexEnd()-1);
int EBPOffset = MFI->getObjectOffset(MFI->getObjectIndexEnd()-1)+4;
MI = addRegOffset(BuildMI(X86::MOVrm32, 5), // mov [ESP-<offset>], EBP
X86::ESP, EBPOffset).addReg(X86::EBP);
@ -190,6 +190,9 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
// eliminates the need for add/sub ESP brackets around call sites.
//
NumBytes += MFI->getMaxCallFrameSize();
// Update frame info to pretend that this is part of the stack...
MFI->setStackSize(NumBytes);
}
if (NumBytes) {
@ -210,7 +213,7 @@ void X86RegisterInfo::emitEpilogue(MachineFunction &MF,
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->getObjectIndexEnd()-1);
int EBPOffset = MFI->getObjectOffset(MFI->getObjectIndexEnd()-1)+4;
// mov ESP, EBP
MI = BuildMI(X86::MOVrr32, 1,X86::ESP).addReg(X86::EBP);
@ -224,7 +227,6 @@ void X86RegisterInfo::emitEpilogue(MachineFunction &MF,
// Get the number of bytes allocated from the FrameInfo...
unsigned NumBytes = MFI->getStackSize();
NumBytes += MFI->getMaxCallFrameSize();
if (NumBytes) { // adjust stack pointer back: ESP += numbytes
MI =BuildMI(X86::ADDri32, 2, X86::ESP).addReg(X86::ESP).addZImm(NumBytes);