introduce the MCParsedAsmOperand class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93454 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCParsedAsmOperand.h

@@ -0,0 +1,28 @@
+//===-- llvm/MC/MCParsedAsmOperand.h - Asm Parser Operand -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCASMOPERAND_H
+#define LLVM_MC_MCASMOPERAND_H
+
+namespace llvm {
+
+/// MCParsedAsmOperand - This abstract class represents a source-level assembly
+/// instruction operand.  It should be subclassed by target-specific code.  This
+/// base class is used by target-independent clients and is the interface
+/// between parsing an asm instruction and recognizing it.
+class MCParsedAsmOperand {
+public:  
+  MCParsedAsmOperand();
+  virtual ~MCParsedAsmOperand() = 0;
+  // TODO: Out of line vfun.
+};
+
+} // end namespace llvm.
+
+#endif

lib/Target/X86/AsmParser/X86AsmParser.cpp

@@ -15,6 +15,7 @@
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCParsedAsmOperand.h"
 #include "llvm/Support/SourceMgr.h"
 #include "llvm/Target/TargetRegistry.h"
 #include "llvm/Target/TargetAsmParser.h"
@@ -71,7 +72,7 @@ namespace {
 
 /// X86Operand - Instances of this class represent a parsed X86 machine
 /// instruction.
-struct X86Operand {
+struct X86Operand : public MCParsedAsmOperand {
   enum {
     Token,
     Register,