Add getFrameIndexReference() to TargetRegisterInfo, which allows targets to

tell debug info which base register to use to reference a frame index on a
per-index basis. This is useful, for example, in the presence of dynamic
stack realignment when local variables are indexed via the stack pointer and
stack-based arguments via the frame pointer.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89620 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetRegisterInfo.h

@@ -698,6 +698,18 @@ public:
   /// the stack frame of the specified index.
   virtual int getFrameIndexOffset(MachineFunction &MF, int FI) const;
 
+  /// getFrameIndexReference - This method should return the base register
+  /// and offset used to reference a frame index location. The offset is
+  /// returned directly, and the base register is returned via FrameReg.
+  virtual int getFrameIndexReference(MachineFunction &MF, int FI,
+                                     unsigned &FrameReg) const {
+    // By default, assume all frame indices are referenced via whatever
+    // getFrameRegister() says. The target can override this if it's doing
+    // something different.
+    FrameReg = getFrameRegister(MF);
+    return getFrameIndexOffset(MF, FI);
+  }
+
   /// getRARegister - This method should return the register where the return
   /// address can be found.
   virtual unsigned getRARegister() const = 0;