Added MipsMachineFunction class, to hold Mips dinamic stack info when inserting Prologue/Epilog

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@39758 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/MipsMachineFunction.h

@@ -0,0 +1,54 @@
+//===-- MipsMachineFunctionInfo.h - Private data used for Mips ----*- C++ -*-=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Bruno Cardoso Lopes and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the Mips specific subclass of MachineFunctionInfo.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MIPS_MACHINE_FUNCTION_INFO_H
+#define MIPS_MACHINE_FUNCTION_INFO_H
+
+#include "llvm/CodeGen/MachineFunction.h"
+
+namespace llvm {
+
+/// MipsFunctionInfo - This class is derived from MachineFunction private
+/// Mips target-specific information for each MachineFunction.
+class MipsFunctionInfo : public MachineFunctionInfo {
+
+private:
+  /// Holds for each function where on the stack 
+  /// the Frame Pointer must be saved
+  int FPStackOffset;
+
+  /// Holds for each function where on the stack 
+  /// the Return Address must be saved
+  int RAStackOffset;
+
+public:
+  MipsFunctionInfo(MachineFunction& MF) 
+  : FPStackOffset(0), RAStackOffset(0)
+  {}
+
+  int getFPStackOffset() const { return FPStackOffset; }
+  void setFPStackOffset(int Off) { FPStackOffset = Off; }
+
+  int getRAStackOffset() const { return RAStackOffset; }
+  void setRAStackOffset(int Off) { RAStackOffset = Off; }
+
+  int getTopSavedRegOffset() const { 
+    return (RAStackOffset > FPStackOffset) ? 
+           (RAStackOffset) : (FPStackOffset);
+  }
+};
+
+} // end of namespace llvm
+
+
+#endif