MachineModuleInfo &MMI = MF.getMMI();
const MCRegisterInfo *MRI = MMI.getContext().getRegisterInfo();
DebugLoc dl;
- bool needsFrameMoves = MMI.hasDebugInfo() ||
+ bool needsCFI = MMI.hasDebugInfo() ||
MF.getFunction()->needsUnwindTableEntry();
bool isPIC = MF.getTarget().getRelocationModel() == Reloc::PIC_;
.addReg(ScratchReg);
}
- // Add the "machine moves" for the instructions we generated above, but in
- // reverse order.
- if (needsFrameMoves) {
- // Show update of SP.
- assert(NegFrameSize);
- unsigned CFIIndex = MMI.addFrameInst(
- MCCFIInstruction::createDefCfaOffset(nullptr, NegFrameSize));
+ // Add Call Frame Information for the instructions we generated above.
+ if (needsCFI) {
+ unsigned CFIIndex;
+
+ if (HasBP) {
+ // Define CFA in terms of BP. Do this in preference to using FP/SP,
+ // because if the stack needed aligning then CFA won't be at a fixed
+ // offset from FP/SP.
+ unsigned Reg = MRI->getDwarfRegNum(BPReg, true);
+ CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaRegister(nullptr, Reg));
+ } else {
+ // Adjust the definition of CFA to account for the change in SP.
+ assert(NegFrameSize);
+ CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaOffset(nullptr, NegFrameSize));
+ }
BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
if (HasFP) {
+ // Describe where FP was saved, at a fixed offset from CFA.
unsigned Reg = MRI->getDwarfRegNum(FPReg, true);
CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createOffset(nullptr, Reg, FPOffset));
}
if (HasBP) {
+ // Describe where BP was saved, at a fixed offset from CFA.
unsigned Reg = MRI->getDwarfRegNum(BPReg, true);
CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createOffset(nullptr, Reg, BPOffset));
}
if (MustSaveLR) {
+ // Describe where LR was saved, at a fixed offset from CFA.
unsigned Reg = MRI->getDwarfRegNum(LRReg, true);
CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createOffset(nullptr, Reg, LROffset));
.addReg(SPReg)
.addReg(SPReg);
- if (needsFrameMoves) {
- // Mark effective beginning of when frame pointer is ready.
+ if (!HasBP && needsCFI) {
+ // Change the definition of CFA from SP+offset to FP+offset, because SP
+ // will change at every alloca.
unsigned Reg = MRI->getDwarfRegNum(FPReg, true);
unsigned CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createDefCfaRegister(nullptr, Reg));
}
}
- if (needsFrameMoves) {
- // Add callee saved registers to move list.
+ if (needsCFI) {
+ // Describe where callee saved registers were saved, at fixed offsets from
+ // CFA.
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
unsigned Reg = CSI[I].getReg();
; CHECK-DAG: subfic 0, [[REG]], -160
; CHECK: stdux 1, 1, 0
+; CHECK: .cfi_def_cfa_register r30
; CHECK: .cfi_offset r30, -16
; CHECK: .cfi_offset lr, 16
; CHECK-FP-DAG: subfic 0, [[REG]], -160
; CHECK-FP: stdux 1, 1, 0
+; CHECK-FP: .cfi_def_cfa_register r30
; CHECK-FP: .cfi_offset r31, -8
; CHECK-FP: .cfi_offset r30, -16
; CHECK-FP: .cfi_offset lr, 16
; CHECK-DAG: subfc 0, [[REG3]], [[REG2]]
; CHECK: stdux 1, 1, 0
+; CHECK: .cfi_def_cfa_register r30
+
; CHECK: blr
; CHECK-32-LABEL: @hoo
; CHECK-DAG: subfic 0, [[REG]], -192
; CHECK: stdux 1, 1, 0
+; CHECK: .cfi_def_cfa_register r30
+
; CHECK: stfd 30, -16(30)
; CHECK: blr
; CHECK-FP-DAG: subfic 0, [[REG]], -192
; CHECK-FP: stdux 1, 1, 0
+; CHECK-FP: .cfi_def_cfa_register r30
+
; CHECK-FP: stfd 30, -16(30)
; CHECK-FP: blr