[Sparc] Implements exception handling in SPARC with DwarfCFI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191432 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 23 insertions, 4 deletions

diff --git a/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.cpp b/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.cpp
index 45cfe03..06b1df6 100644
--- a/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.cpp
+++ b/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.cpp
@@ -36,6 +36,8 @@ SparcELFMCAsmInfo::SparcELFMCAsmInfo(StringRef TT) {
   HasLEB128 = true;
   SupportsDebugInformation = true;
 
+  ExceptionsType = ExceptionHandling::DwarfCFI;
+
   SunStyleELFSectionSwitchSyntax = true;
   UsesELFSectionDirectiveForBSS = true;
 
diff --git a/lib/Target/Sparc/SparcFrameLowering.cpp b/lib/Target/Sparc/SparcFrameLowering.cpp
index 536e466..1f9cac5 100644
--- a/lib/Target/Sparc/SparcFrameLowering.cpp
+++ b/lib/Target/Sparc/SparcFrameLowering.cpp
@@ -70,6 +70,25 @@ void SparcFrameLowering::emitPrologue(MachineFunction &MF) const {
     BuildMI(MBB, MBBI, dl, TII.get(SAVErr), SP::O6)
       .addReg(SP::O6).addReg(SP::G1);
   }
+  MachineModuleInfo &MMI = MF.getMMI();
+  const MCRegisterInfo *MRI = MMI.getContext().getRegisterInfo();
+  MCSymbol *FrameLabel = MMI.getContext().CreateTempSymbol();
+  BuildMI(MBB, MBBI, dl, TII.get(SP::PROLOG_LABEL)).addSym(FrameLabel);
+
+  unsigned regFP = MRI->getDwarfRegNum(SP::I6, true);
+
+  // Emit ".cfi_def_cfa_register 30".
+  MMI.addFrameInst(MCCFIInstruction::createDefCfaRegister(FrameLabel,
+                                                          regFP));
+  // Emit ".cfi_window_save".
+  MMI.addFrameInst(MCCFIInstruction::createWindowSave(FrameLabel));
+
+  unsigned regInRA = MRI->getDwarfRegNum(SP::I7, true);
+  unsigned regOutRA = MRI->getDwarfRegNum(SP::O7, true);
+  // Emit ".cfi_register 15, 31".
+  MMI.addFrameInst(MCCFIInstruction::createRegister(FrameLabel,
+                                                    regOutRA,
+                                                    regInRA));
 }
 
 void SparcFrameLowering::
diff --git a/lib/Target/Sparc/SparcISelLowering.cpp b/lib/Target/Sparc/SparcISelLowering.cpp
index 86bac7e..cdba998 100644
--- a/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/lib/Target/Sparc/SparcISelLowering.cpp
@@ -1432,8 +1432,6 @@ SparcTargetLowering::SparcTargetLowering(TargetMachine &TM)
   setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
   setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
 
-  setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
-
   // VASTART needs to be custom lowered to use the VarArgsFrameIndex.
   setOperationAction(ISD::VASTART           , MVT::Other, Custom);
   // VAARG needs to be lowered to not do unaligned accesses for doubles.
@@ -1446,8 +1444,8 @@ SparcTargetLowering::SparcTargetLowering(TargetMachine &TM)
   setOperationAction(ISD::STACKRESTORE      , MVT::Other, Expand);
   setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32  , Custom);
 
-  // No debug info support yet.
-  setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
+  setExceptionPointerRegister(SP::I0);
+  setExceptionSelectorRegister(SP::I1);
 
   setStackPointerRegisterToSaveRestore(SP::O6);