[llvm] r179115 - [ms-inline asm] Use parsePrimaryExpr in lieu of parseExpression if we need to

[Chad Rosier]

Author: mcrosier
Date: Tue Apr  9 14:34:59 2013
New Revision: 179115

URL: http://llvm.org/viewvc/llvm-project?rev=179115&view=rev
Log:
[ms-inline asm] Use parsePrimaryExpr in lieu of parseExpression if we need to
parse an identifier.  Otherwise, parseExpression may parse multiple tokens,
which makes it impossible to properly compute an immediate displacement.
An example of such a case is the source operand (i.e., [Symbol + ImmDisp]) in
the below example:

 __asm mov eax, [Symbol + ImmDisp]

The existing test cases exercise this patch.
rdar://13611297

Modified:
    llvm/trunk/include/llvm/MC/MCParser/MCAsmParser.h
    llvm/trunk/lib/MC/MCParser/AsmParser.cpp
    llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp

Modified: llvm/trunk/include/llvm/MC/MCParser/MCAsmParser.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/MC/MCParser/MCAsmParser.h?rev=179115&r1=179114&r2=179115&view=diff
==============================================================================
--- llvm/trunk/include/llvm/MC/MCParser/MCAsmParser.h (original)
+++ llvm/trunk/include/llvm/MC/MCParser/MCAsmParser.h Tue Apr  9 14:34:59 2013
@@ -151,6 +151,13 @@ public:
   virtual bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
   bool parseExpression(const MCExpr *&Res);
 
+  /// parsePrimaryExpr - Parse a primary expression.
+  ///
+  /// @param Res - The value of the expression. The result is undefined
+  /// on error.
+  /// @result - False on success.
+  virtual bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) = 0;
+
   /// parseParenExpression - Parse an arbitrary expression, assuming that an
   /// initial '(' has already been consumed.
   ///

Modified: llvm/trunk/lib/MC/MCParser/AsmParser.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCParser/AsmParser.cpp?rev=179115&r1=179114&r2=179115&view=diff
==============================================================================
--- llvm/trunk/lib/MC/MCParser/AsmParser.cpp (original)
+++ llvm/trunk/lib/MC/MCParser/AsmParser.cpp Tue Apr  9 14:34:59 2013
@@ -221,6 +221,7 @@ public:
 
   bool parseExpression(const MCExpr *&Res);
   virtual bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc);
+  virtual bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc);
   virtual bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc);
   virtual bool parseAbsoluteExpression(int64_t &Res);
 
@@ -869,6 +870,10 @@ bool AsmParser::parseExpression(const MC
   return parseExpression(Res, EndLoc);
 }
 
+bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
+  return ParsePrimaryExpr(Res, EndLoc);
+}
+
 const MCExpr *
 AsmParser::ApplyModifierToExpr(const MCExpr *E,
                                MCSymbolRefExpr::VariantKind Variant) {

Modified: llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp?rev=179115&r1=179114&r2=179115&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp (original)
+++ llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp Tue Apr  9 14:34:59 2013
@@ -1130,7 +1130,7 @@ X86Operand *X86AsmParser::ParseIntelBrac
     if (ParseRegister(TmpReg, Start, End)) {
       const MCExpr *Disp;
       SMLoc IdentStart = Tok.getLoc();
-      if (getParser().parseExpression(Disp, End))
+      if (getParser().parsePrimaryExpr(Disp, End))
         return 0;
 
       if (X86Operand *Err = ParseIntelVarWithQualifier(Disp, IdentStart))
@@ -1182,7 +1182,7 @@ X86Operand *X86AsmParser::ParseIntelBrac
         SM.onRegister(TmpReg);
         UpdateLocLex = false;
         break;
-      } else if (!getParser().parseExpression(Disp, End)) {
+      } else if (!getParser().parsePrimaryExpr(Disp, End)) {
         SM.onDispExpr();
         UpdateLocLex = false;
         break;
@@ -1324,7 +1324,7 @@ X86Operand *X86AsmParser::ParseIntelMemO
 
   const MCExpr *Disp = 0;
   SMLoc IdentStart = Tok.getLoc();
-  if (getParser().parseExpression(Disp, End))
+  if (getParser().parsePrimaryExpr(Disp, End))
     return 0;
 
   if (!isParsingInlineAsm())
@@ -1401,7 +1401,7 @@ X86Operand *X86AsmParser::ParseIntelOffs
 
   SMLoc End;
   const MCExpr *Val;
-  if (getParser().parseExpression(Val, End))
+  if (getParser().parsePrimaryExpr(Val, End))
     return ErrorOperand(Start, "Unable to parse expression!");
 
   // Don't emit the offset operator.
@@ -1437,7 +1437,7 @@ X86Operand *X86AsmParser::ParseIntelOper
 
   SMLoc End;
   const MCExpr *Val;
-  if (getParser().parseExpression(Val, End))
+  if (getParser().parsePrimaryExpr(Val, End))
     return 0;
 
   unsigned Length = 0, Size = 0, Type = 0;