Add a target hook to encode the compact unwind information.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134577 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 16 insertions, 5 deletions

diff --git a/include/llvm/Target/TargetAsmInfo.h b/include/llvm/Target/TargetAsmInfo.h
index 9beff25bcf..cdd1672be6 100644
--- a/include/llvm/Target/TargetAsmInfo.h
+++ b/include/llvm/Target/TargetAsmInfo.h
@@ -30,8 +30,9 @@ class TargetAsmInfo {
   unsigned PointerSize;
   bool IsLittleEndian;
   TargetFrameLowering::StackDirection StackDir;
-  const TargetRegisterInfo *TRI;
   std::vector<MachineMove> InitialFrameState;
+  const TargetRegisterInfo *TRI;
+  const TargetFrameLowering *TFI;
   const TargetLoweringObjectFile *TLOF;
 
 public:
@@ -83,6 +84,11 @@ public:
     return TLOF->isFunctionEHFrameSymbolPrivate();
   }
 
+  int getCompactUnwindEncoding(const std::vector<MCCFIInstruction> &Instrs,
+                               int DataAlignmentFactor, bool IsEH) const {
+    return TFI->getCompactUnwindEncoding(Instrs, DataAlignmentFactor, IsEH);
+  }
+
   const unsigned *getCalleeSavedRegs(MachineFunction *MF = 0) const {
     return TRI->getCalleeSavedRegs(MF);
   }
@@ -106,10 +112,6 @@ public:
   int getSEHRegNum(unsigned RegNum) const {
     return TRI->getSEHRegNum(RegNum);
   }
-
-  int getCompactUnwindRegNum(unsigned RegNum, bool isEH) const {
-    return TRI->getCompactUnwindRegNum(RegNum, isEH);
-  }
 };
 
 }
diff --git a/include/llvm/Target/TargetFrameLowering.h b/include/llvm/Target/TargetFrameLowering.h
index e104b1663f..70cecbd37f 100644
--- a/include/llvm/Target/TargetFrameLowering.h
+++ b/include/llvm/Target/TargetFrameLowering.h
@@ -14,6 +14,7 @@
 #ifndef LLVM_TARGET_TARGETFRAMELOWERING_H
 #define LLVM_TARGET_TARGETFRAMELOWERING_H
 
+#include "llvm/MC/MCDwarf.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 
 #include <utility>
@@ -189,6 +190,14 @@ public:
   ///
   virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
   }
+
+  /// getCompactUnwindEncoding - Get the compact unwind encoding for the
+  /// function. Return 0 if the compact unwind isn't available.
+  virtual uint32_t getCompactUnwindEncoding(const std::vector<MCCFIInstruction>&,
+                                            int /*DataAlignmentFactor*/,
+                                            bool /*IsEH*/) const {
+    return 0;
+  }
 };
 
 } // End llvm namespace