Implement @llvm.returnaddress. rdar://8015977.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104421 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 15 insertions, 2 deletions

diff --git a/include/llvm/CodeGen/MachineFrameInfo.h b/include/llvm/CodeGen/MachineFrameInfo.h
index 25622c6..fe2c298 100644
--- a/include/llvm/CodeGen/MachineFrameInfo.h
+++ b/include/llvm/CodeGen/MachineFrameInfo.h
@@ -125,6 +125,10 @@ class MachineFrameInfo {
   /// to builtin \@llvm.frameaddress.
   bool FrameAddressTaken;
 
+  /// ReturnAddressTaken - This boolean keeps track of whether there is a call
+  /// to builtin \@llvm.returnaddress.
+  bool ReturnAddressTaken;
+
   /// StackSize - The prolog/epilog code inserter calculates the final stack
   /// offsets for all of the fixed size objects, updating the Objects list
   /// above.  It then updates StackSize to contain the number of bytes that need
@@ -193,6 +197,7 @@ public:
     StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0;
     HasVarSizedObjects = false;
     FrameAddressTaken = false;
+    ReturnAddressTaken = false;
     AdjustsStack = false;
     HasCalls = false;
     StackProtectorIdx = -1;
@@ -223,6 +228,12 @@ public:
   bool isFrameAddressTaken() const { return FrameAddressTaken; }
   void setFrameAddressIsTaken(bool T) { FrameAddressTaken = T; }
 
+  /// isReturnAddressTaken - This method may be called any time after instruction
+  /// selection is complete to determine if there is a call to
+  /// \@llvm.returnaddress in this function.
+  bool isReturnAddressTaken() const { return ReturnAddressTaken; }
+  void setReturnAddressIsTaken(bool s) { ReturnAddressTaken = s; }
+
   /// getObjectIndexBegin - Return the minimum frame object index.
   ///
   int getObjectIndexBegin() const { return -NumFixedObjects; }
diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h
index 43005c0..2e5697e 100644
--- a/include/llvm/Target/TargetInstrInfo.h
+++ b/include/llvm/Target/TargetInstrInfo.h
@@ -352,7 +352,8 @@ public:
   /// storeRegToStackSlot(). Returns false otherwise.
   virtual bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
                                          MachineBasicBlock::iterator MI,
-                                const std::vector<CalleeSavedInfo> &CSI) const {
+                                         const std::vector<CalleeSavedInfo> &CSI,
+                                         const TargetRegisterInfo *TRI) const {
     return false;
   }
 
@@ -362,7 +363,8 @@ public:
   /// Returns false otherwise.
   virtual bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
                                            MachineBasicBlock::iterator MI,
-                                const std::vector<CalleeSavedInfo> &CSI) const {
+                                        const std::vector<CalleeSavedInfo> &CSI,
+                                        const TargetRegisterInfo *TRI) const {
     return false;
   }