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[X86] Try to shorten dwarf CFI emission

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239786 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner 2015-06-15 23:45:08 +00:00
parent 0f80e47db3
commit 46446a56b8
1 changed files with 23 additions and 28 deletions
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51
lib/Target/X86/X86FrameLowering.cpp
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@ -345,6 +345,16 @@ int X86FrameLowering::mergeSPUpdates(MachineBasicBlock &MBB,
return Offset;
}
/// Wraps up getting a CFI index and building a MachineInstr for it.
static void BuildCFI(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
DebugLoc DL, const TargetInstrInfo &TII,
MCCFIInstruction CFIInst) {
MachineFunction &MF = *MBB.getParent();
unsigned CFIIndex = MF.getMMI().addFrameInst(CFIInst);
BuildMI(MBB, MBBI, DL, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
}
void
X86FrameLowering::emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI,
@ -366,11 +376,8 @@ X86FrameLowering::emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
unsigned Reg = I->getReg();
unsigned DwarfReg = MRI->getDwarfRegNum(Reg, true);
unsigned CFIIndex =
MMI.addFrameInst(MCCFIInstruction::createOffset(nullptr, DwarfReg,
Offset));
BuildMI(MBB, MBBI, DL, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
BuildCFI(MBB, MBBI, DL, TII,
MCCFIInstruction::createOffset(nullptr, DwarfReg, Offset));
}
}
@ -691,18 +698,14 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF,
// Mark the place where EBP/RBP was saved.
// Define the current CFA rule to use the provided offset.
assert(StackSize);
unsigned CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createDefCfaOffset(nullptr, 2 * stackGrowth));
BuildMI(MBB, MBBI, DL, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
BuildCFI(MBB, MBBI, DL, TII,
MCCFIInstruction::createDefCfaOffset(nullptr, 2 * stackGrowth));
// Change the rule for the FramePtr to be an "offset" rule.
unsigned DwarfFramePtr = RegInfo->getDwarfRegNum(MachineFramePtr, true);
CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createOffset(nullptr,
DwarfFramePtr, 2 * stackGrowth));
BuildMI(MBB, MBBI, DL, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
BuildCFI(MBB, MBBI, DL, TII,
MCCFIInstruction::createOffset(nullptr, DwarfFramePtr,
2 * stackGrowth));
}
if (NeedsWinEH) {
@ -724,10 +727,8 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF,
// Mark effective beginning of when frame pointer becomes valid.
// Define the current CFA to use the EBP/RBP register.
unsigned DwarfFramePtr = RegInfo->getDwarfRegNum(MachineFramePtr, true);
unsigned CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createDefCfaRegister(nullptr, DwarfFramePtr));
BuildMI(MBB, MBBI, DL, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
BuildCFI(MBB, MBBI, DL, TII,
MCCFIInstruction::createDefCfaRegister(nullptr, DwarfFramePtr));
}
// Mark the FramePtr as live-in in every block.
@ -752,10 +753,8 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF,
// Mark callee-saved push instruction.
// Define the current CFA rule to use the provided offset.
assert(StackSize);
unsigned CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createDefCfaOffset(nullptr, StackOffset));
BuildMI(MBB, MBBI, DL, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
BuildCFI(MBB, MBBI, DL, TII,
MCCFIInstruction::createDefCfaOffset(nullptr, StackOffset));
StackOffset += stackGrowth;
}
@ -950,12 +949,8 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF,
if (!HasFP && NumBytes) {
// Define the current CFA rule to use the provided offset.
assert(StackSize);
unsigned CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createDefCfaOffset(nullptr,
-StackSize + stackGrowth));
BuildMI(MBB, MBBI, DL, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
BuildCFI(MBB, MBBI, DL, TII, MCCFIInstruction::createDefCfaOffset(
nullptr, -StackSize + stackGrowth));
}
// Emit DWARF info specifying the offsets of the callee-saved registers.