add a simple MCImm class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73984 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCImm.h

@@ -0,0 +1,55 @@
+//===-- llvm/MC/MCImm.h - MCImm class ---------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declaration of the MCInst and MCOperand classes, which
+// is the basic representation used to represent low-level machine code
+// instructions.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCIMM_H
+#define LLVM_MC_MCIMM_H
+
+namespace llvm {
+class MCSymbol;
+
+/// MCImm - This represents an "assembler immediate".  In its most general form,
+/// this can hold "SymbolA - SymbolB + imm64".  Not all targets supports
+/// relocations of this general form, but we need to represent this anyway.
+class MCImm {
+  MCSymbol *SymA, *SymB;
+  int64_t Cst;
+public:
+
+  int64_t getCst() const { return Cst; }
+  MCSymbol *getSymA() const { return SymA; }
+  MCSymbol *getSymB() const { return SymB; }
+  
+  
+  static MCImm get(MCSymbol *SymA, MCSymbol *SymB = 0, int64_t Val = 0) {
+    MCImm R;
+    R.Cst = Val;
+    R.SymA = SymA;
+    R.SymB = SymB;
+    return R;
+  }
+  
+  static MCImm get(int64_t Val) {
+    MCImm R;
+    R.Cst = Val;
+    R.SymA = 0;
+    R.SymB = 0;
+    return R;
+  }
+  
+};
+
+} // end namespace llvm
+
+#endif

include/llvm/MC/MCInst.h

@@ -13,10 +13,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-
 #ifndef LLVM_MC_MCINST_H
 #define LLVM_MC_MCINST_H
 
+#include "llvm/MC/MCImm.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/DataTypes.h"
 #include "llvm/Support/DebugLoc.h"
@@ -30,13 +30,15 @@ class MCOperand {
     kInvalid,                 ///< Uninitialized.
     kRegister,                ///< Register operand.
     kImmediate,               ///< Immediate operand.
-    kMBBLabel                 ///< Basic block label.
+    kMBBLabel,                ///< Basic block label.
+    kMCImm
   };
   unsigned char Kind;
   
   union {
     unsigned RegVal;
     int64_t ImmVal;
+    MCImm MCImmVal;
     struct {
       unsigned FunctionNo;
       unsigned BlockNo;