diff options
author | Jessica Paquette <jpaquette@apple.com> | 2018-03-19 22:48:40 +0000 |
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committer | Jessica Paquette <jpaquette@apple.com> | 2018-03-19 22:48:40 +0000 |
commit | aa9b406e17ab028c95099d41aa10395df5d6e326 (patch) | |
tree | 667ce6a1aa3c98df05ad3e0b117da88bd6530e19 /lib/Target/AArch64/AArch64InstrInfo.cpp | |
parent | a1b5897aa3029a1a02f176a7050d7ca431e8d3e9 (diff) |
[MachineOutliner] AArch64: Emit CFI instructions when outlining calls
When outlining calls, the outliner needs to update CFI to ensure that, say,
exception handling works. This commit adds that functionality and adds a test
just for call outlining.
Call outlining stuff in machine-outliner.mir should be moved into
machine-outliner-calls.mir in a later commit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327917 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/AArch64/AArch64InstrInfo.cpp')
-rw-r--r-- | lib/Target/AArch64/AArch64InstrInfo.cpp | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/Target/AArch64/AArch64InstrInfo.cpp b/lib/Target/AArch64/AArch64InstrInfo.cpp index 0164905a3e0..585524ebbf2 100644 --- a/lib/Target/AArch64/AArch64InstrInfo.cpp +++ b/lib/Target/AArch64/AArch64InstrInfo.cpp @@ -5282,6 +5282,25 @@ void AArch64InstrInfo::insertOutlinerEpilogue( .addImm(-16); It = MBB.insert(It, STRXpre); + const TargetSubtargetInfo &STI = MF.getSubtarget(); + const MCRegisterInfo *MRI = STI.getRegisterInfo(); + unsigned DwarfReg = MRI->getDwarfRegNum(AArch64::LR, true); + + // Add a CFI saying the stack was moved 16 B down. + int64_t StackPosEntry = + MF.addFrameInst(MCCFIInstruction::createDefCfaOffset(nullptr, 16)); + BuildMI(MBB, It, DebugLoc(), get(AArch64::CFI_INSTRUCTION)) + .addCFIIndex(StackPosEntry) + .setMIFlags(MachineInstr::FrameSetup); + + // Add a CFI saying that the LR that we want to find is now 16 B higher than + // before. + int64_t LRPosEntry = + MF.addFrameInst(MCCFIInstruction::createOffset(nullptr, DwarfReg, 16)); + BuildMI(MBB, It, DebugLoc(), get(AArch64::CFI_INSTRUCTION)) + .addCFIIndex(LRPosEntry) + .setMIFlags(MachineInstr::FrameSetup); + // Insert a restore before the terminator for the function. MachineInstr *LDRXpost = BuildMI(MF, DebugLoc(), get(AArch64::LDRXpost)) .addReg(AArch64::SP, RegState::Define) |