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ARM/AArch64: Attach the FrameSetup MIFlag to CFI instructions.

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Debug info marks the first instruction without the FrameSetup flag
as being the end of the function prologue. Any CFI instructions in the
middle of the function prologue would cause debug info to end the prologue
too early and worse, attach the line number of the CFI instruction, which
incidentally is often 0.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224294 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl
2014-12-16 00:20:49 +00:00
parent 3a0f6b52db
commit 6f059afde6
5 changed files with 256 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
lib/Target/ARM/ARMFrameLowering.cpp
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@@ -203,7 +203,9 @@ struct StackAdjustingInsts {
unsigned CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createDefCfaOffset(nullptr, CFAOffset));
BuildMI(MBB, std::next(Info.I), dl,
TII.get(TargetOpcode::CFI_INSTRUCTION)).addCFIIndex(CFIIndex);
TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex)
.setMIFlags(MachineInstr::FrameSetup);
}
}
};
@@ -451,13 +453,15 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
nullptr, MRI->getDwarfRegNum(FramePtr, true),
-(ArgRegsSaveSize - FramePtrOffsetInPush)));
BuildMI(MBB, AfterPush, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
.addCFIIndex(CFIIndex)
.setMIFlags(MachineInstr::FrameSetup);
} else {
unsigned CFIIndex =
MMI.addFrameInst(MCCFIInstruction::createDefCfaRegister(
nullptr, MRI->getDwarfRegNum(FramePtr, true)));
BuildMI(MBB, AfterPush, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
.addCFIIndex(CFIIndex)
.setMIFlags(MachineInstr::FrameSetup);
}
}
@@ -491,7 +495,8 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
CFIIndex = MMI.addFrameInst(MCCFIInstruction::createOffset(
nullptr, MRI->getDwarfRegNum(Reg, true), MFI->getObjectOffset(FI)));
BuildMI(MBB, Pos, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
.addCFIIndex(CFIIndex)
.setMIFlags(MachineInstr::FrameSetup);
break;
}
}
@@ -514,7 +519,8 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
unsigned CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createOffset(nullptr, DwarfReg, Offset));
BuildMI(MBB, Pos, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
.addCFIIndex(CFIIndex)
.setMIFlags(MachineInstr::FrameSetup);
}
break;
}
@@ -535,7 +541,8 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
unsigned CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createOffset(nullptr, DwarfReg, Offset));
BuildMI(MBB, Pos, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
.addCFIIndex(CFIIndex)
.setMIFlags(MachineInstr::FrameSetup);
}
}
}