diff --git a/include/llvm/MC/MCAsmParser.h b/include/llvm/MC/MCAsmParser.h
index d530093..a3c10f9 100644
--- a/include/llvm/MC/MCAsmParser.h
+++ b/include/llvm/MC/MCAsmParser.h
@@ -55,15 +55,17 @@
   /// @param Res - The value of the expression. The result is undefined
   /// on error.
   /// @result - False on success.
-  virtual bool ParseExpression(const MCExpr *&Res) = 0;
-
+  virtual bool ParseExpression(const MCExpr *&Res,
+                               SMLoc &StartLoc, SMLoc &EndLoc) = 0;
+  bool ParseExpression(const MCExpr *&Res);
+  
   /// ParseParenExpression - Parse an arbitrary expression, assuming that an
   /// initial '(' has already been consumed.
   ///
   /// @param Res - The value of the expression. The result is undefined
   /// on error.
   /// @result - False on success.
-  virtual bool ParseParenExpression(const MCExpr *&Res) = 0;
+  virtual bool ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
 
   /// ParseAbsoluteExpression - Parse an expression which must evaluate to an
   /// absolute value.
diff --git a/lib/MC/MCAsmParser.cpp b/lib/MC/MCAsmParser.cpp
index 2287e89..b58d6d4 100644
--- a/lib/MC/MCAsmParser.cpp
+++ b/lib/MC/MCAsmParser.cpp
@@ -8,7 +8,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/MC/MCAsmParser.h"
-
+#include "llvm/MC/MCParsedAsmOperand.h"
+#include "llvm/Support/SourceMgr.h"
 using namespace llvm;
 
 MCAsmParser::MCAsmParser() {
@@ -16,3 +17,15 @@
 
 MCAsmParser::~MCAsmParser() {
 }
+
+bool MCAsmParser::ParseExpression(const MCExpr *&Res) {
+  SMLoc L;
+  return ParseExpression(Res, L, L);
+}
+
+
+/// getStartLoc - Get the location of the first token of this operand.
+SMLoc MCParsedAsmOperand::getStartLoc() const { return SMLoc(); }
+SMLoc MCParsedAsmOperand::getEndLoc() const { return SMLoc(); }
+
+
diff --git a/lib/Target/X86/AsmParser/X86AsmParser.cpp b/lib/Target/X86/AsmParser/X86AsmParser.cpp
index 8ccfc8f..7539528 100644
--- a/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -201,8 +201,8 @@
       Inst.addOperand(MCOperand::CreateReg(getMemSegReg()));
   }
 
-  static X86Operand *CreateToken(StringRef Str) {
-    X86Operand *Res = new X86Operand(Token);
+  static X86Operand *CreateToken(StringRef Str, SMLoc Loc) {
+    X86Operand *Res = new X86Operand(Token, Loc, Loc);
     Res->Tok.Data = Str.data();
     Res->Tok.Length = Str.size();
     return Res;
@@ -214,8 +214,8 @@
     return Res;
   }
 
-  static X86Operand *CreateImm(const MCExpr *Val) {
-    X86Operand *Res = new X86Operand(Immediate);
+  static X86Operand *CreateImm(const MCExpr *Val, SMLoc StartLoc, SMLoc EndLoc){
+    X86Operand *Res = new X86Operand(Immediate, StartLoc, EndLoc);
     Res->Imm.Val = Val;
     return Res;
   }
@@ -281,9 +281,10 @@
     // $42 -> immediate.
     getLexer().Lex();
     const MCExpr *Val;
-    if (getParser().ParseExpression(Val))
+    SMLoc Start, End;
+    if (getParser().ParseExpression(Val, Start, End))
       return 0;
-    return X86Operand::CreateImm(Val);
+    return X86Operand::CreateImm(Val, Start, End);
   }
   }
 }
@@ -299,14 +300,15 @@
   // it.
   const MCExpr *Disp = MCConstantExpr::Create(0, getParser().getContext());
   if (getLexer().isNot(AsmToken::LParen)) {
-    if (getParser().ParseExpression(Disp)) return 0;
+    SMLoc ExprStart, ExprEnd;
+    if (getParser().ParseExpression(Disp, ExprStart, ExprEnd)) return 0;
     
     // After parsing the base expression we could either have a parenthesized
     // memory address or not.  If not, return now.  If so, eat the (.
     if (getLexer().isNot(AsmToken::LParen)) {
       // Unless we have a segment register, treat this as an immediate.
       if (SegReg == 0)
-        return X86Operand::CreateImm(Disp);
+        return X86Operand::CreateImm(Disp, ExprStart, ExprEnd);
       return X86Operand::CreateMem(SegReg, Disp, 0, 0, 1);
     }
     
@@ -315,14 +317,17 @@
   } else {
     // Okay, we have a '('.  We don't know if this is an expression or not, but
     // so we have to eat the ( to see beyond it.
+    SMLoc LParenLoc = getLexer().getTok().getLoc();
     getLexer().Lex(); // Eat the '('.
     
     if (getLexer().is(AsmToken::Percent) || getLexer().is(AsmToken::Comma)) {
       // Nothing to do here, fall into the code below with the '(' part of the
       // memory operand consumed.
     } else {
+      SMLoc ExprEnd;
+      
       // It must be an parenthesized expression, parse it now.
-      if (getParser().ParseParenExpression(Disp))
+      if (getParser().ParseParenExpression(Disp, ExprEnd))
         return 0;
       
       // After parsing the base expression we could either have a parenthesized
@@ -330,7 +335,7 @@
       if (getLexer().isNot(AsmToken::LParen)) {
         // Unless we have a segment register, treat this as an immediate.
         if (SegReg == 0)
-          return X86Operand::CreateImm(Disp);
+          return X86Operand::CreateImm(Disp, LParenLoc, ExprEnd);
         return X86Operand::CreateMem(SegReg, Disp, 0, 0, 1);
       }
       
@@ -414,15 +419,15 @@
 ParseInstruction(const StringRef &Name, SMLoc NameLoc,
                  SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
 
-  Operands.push_back(X86Operand::CreateToken(Name));
+  Operands.push_back(X86Operand::CreateToken(Name, NameLoc));
 
-  SMLoc Loc = getLexer().getTok().getLoc();
   if (getLexer().isNot(AsmToken::EndOfStatement)) {
 
     // Parse '*' modifier.
     if (getLexer().is(AsmToken::Star)) {
+      SMLoc Loc = getLexer().getTok().getLoc();
+      Operands.push_back(X86Operand::CreateToken("*", Loc));
       getLexer().Lex(); // Eat the star.
-      Operands.push_back(X86Operand::CreateToken("*"));
     }
 
     // Read the first operand.
diff --git a/tools/llvm-mc/AsmParser.cpp b/tools/llvm-mc/AsmParser.cpp
index 2eb75a7..4e03646 100644
--- a/tools/llvm-mc/AsmParser.cpp
+++ b/tools/llvm-mc/AsmParser.cpp
@@ -29,11 +29,6 @@
 #include "llvm/Target/TargetAsmParser.h"
 using namespace llvm;
 
-/// getStartLoc - Get the location of the first token of this operand.
-SMLoc MCParsedAsmOperand::getStartLoc() const { return SMLoc(); }
-SMLoc MCParsedAsmOperand::getEndLoc() const { return SMLoc(); }
-
-
 // Mach-O section uniquing.
 //
 // FIXME: Figure out where this should live, it should be shared by
@@ -193,10 +188,11 @@
 ///
 /// parenexpr ::= expr)
 ///
-bool AsmParser::ParseParenExpr(const MCExpr *&Res) {
+bool AsmParser::ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
   if (ParseExpression(Res)) return true;
   if (Lexer.isNot(AsmToken::RParen))
     return TokError("expected ')' in parentheses expression");
+  EndLoc = Lexer.getLoc();
   Lexer.Lex();
   return false;
 }
@@ -217,13 +213,13 @@
 ///  primaryexpr ::= symbol
 ///  primaryexpr ::= number
 ///  primaryexpr ::= ~,+,- primaryexpr
-bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res) {
+bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
   switch (Lexer.getKind()) {
   default:
     return TokError("unknown token in expression");
   case AsmToken::Exclaim:
     Lexer.Lex(); // Eat the operator.
-    if (ParsePrimaryExpr(Res))
+    if (ParsePrimaryExpr(Res, EndLoc))
       return true;
     Res = MCUnaryExpr::CreateLNot(Res, getContext());
     return false;
@@ -231,6 +227,7 @@
   case AsmToken::Identifier: {
     // This is a symbol reference.
     MCSymbol *Sym = CreateSymbol(Lexer.getTok().getIdentifier());
+    EndLoc = Lexer.getLoc();
     Lexer.Lex(); // Eat identifier.
 
     // If this is an absolute variable reference, substitute it now to preserve
@@ -246,32 +243,38 @@
   }
   case AsmToken::Integer:
     Res = MCConstantExpr::Create(Lexer.getTok().getIntVal(), getContext());
+    EndLoc = Lexer.getLoc();
     Lexer.Lex(); // Eat token.
     return false;
   case AsmToken::LParen:
     Lexer.Lex(); // Eat the '('.
-    return ParseParenExpr(Res);
+    return ParseParenExpr(Res, EndLoc);
   case AsmToken::Minus:
     Lexer.Lex(); // Eat the operator.
-    if (ParsePrimaryExpr(Res))
+    if (ParsePrimaryExpr(Res, EndLoc))
       return true;
     Res = MCUnaryExpr::CreateMinus(Res, getContext());
     return false;
   case AsmToken::Plus:
     Lexer.Lex(); // Eat the operator.
-    if (ParsePrimaryExpr(Res))
+    if (ParsePrimaryExpr(Res, EndLoc))
       return true;
     Res = MCUnaryExpr::CreatePlus(Res, getContext());
     return false;
   case AsmToken::Tilde:
     Lexer.Lex(); // Eat the operator.
-    if (ParsePrimaryExpr(Res))
+    if (ParsePrimaryExpr(Res, EndLoc))
       return true;
     Res = MCUnaryExpr::CreateNot(Res, getContext());
     return false;
   }
 }
 
+bool AsmParser::ParseExpression(const MCExpr *&Res) {
+  SMLoc L;
+  return ParseExpression(Res, L, L);
+}
+
 /// ParseExpression - Parse an expression and return it.
 /// 
 ///  expr ::= expr +,- expr          -> lowest.
@@ -279,14 +282,16 @@
 ///  expr ::= expr *,/,%,<<,>> expr  -> highest.
 ///  expr ::= primaryexpr
 ///
-bool AsmParser::ParseExpression(const MCExpr *&Res) {
+bool AsmParser::ParseExpression(const MCExpr *&Res,
+                                SMLoc &StartLoc, SMLoc &EndLoc) {
+  StartLoc = Lexer.getLoc();
   Res = 0;
-  return ParsePrimaryExpr(Res) ||
-         ParseBinOpRHS(1, Res);
+  return ParsePrimaryExpr(Res, EndLoc) ||
+         ParseBinOpRHS(1, Res, EndLoc);
 }
 
-bool AsmParser::ParseParenExpression(const MCExpr *&Res) {
-  if (ParseParenExpr(Res))
+bool AsmParser::ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
+  if (ParseParenExpr(Res, EndLoc))
     return true;
 
   return false;
@@ -381,7 +386,8 @@
 
 /// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'.
 /// Res contains the LHS of the expression on input.
-bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res) {
+bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
+                              SMLoc &EndLoc) {
   while (1) {
     MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
     unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
@@ -395,14 +401,14 @@
     
     // Eat the next primary expression.
     const MCExpr *RHS;
-    if (ParsePrimaryExpr(RHS)) return true;
+    if (ParsePrimaryExpr(RHS, EndLoc)) return true;
     
     // If BinOp binds less tightly with RHS than the operator after RHS, let
     // the pending operator take RHS as its LHS.
     MCBinaryExpr::Opcode Dummy;
     unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
     if (TokPrec < NextTokPrec) {
-      if (ParseBinOpRHS(Precedence+1, RHS)) return true;
+      if (ParseBinOpRHS(Precedence+1, RHS, EndLoc)) return true;
     }
 
     // Merge LHS and RHS according to operator.
diff --git a/tools/llvm-mc/AsmParser.h b/tools/llvm-mc/AsmParser.h
index 171dfcd..63bac59 100644
--- a/tools/llvm-mc/AsmParser.h
+++ b/tools/llvm-mc/AsmParser.h
@@ -79,8 +79,10 @@
   virtual void Warning(SMLoc L, const Twine &Meg);
   virtual bool Error(SMLoc L, const Twine &Msg);
 
-  virtual bool ParseExpression(const MCExpr *&Res);
-  virtual bool ParseParenExpression(const MCExpr *&Res);
+  bool ParseExpression(const MCExpr *&Res);
+  virtual bool ParseExpression(const MCExpr *&Res,
+                               SMLoc &StartLoc, SMLoc &EndLoc);
+  virtual bool ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc);
   virtual bool ParseAbsoluteExpression(int64_t &Res);
 
   /// }
@@ -105,9 +107,9 @@
   
   bool ParseAssignment(const StringRef &Name);
 
-  bool ParsePrimaryExpr(const MCExpr *&Res);
-  bool ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res);
-  bool ParseParenExpr(const MCExpr *&Res);
+  bool ParsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc);
+  bool ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc);
+  bool ParseParenExpr(const MCExpr *&Res, SMLoc &EndLoc);
 
   /// ParseIdentifier - Parse an identifier or string (as a quoted identifier)
   /// and set \arg Res to the identifier contents.