[ms-inline asm] If the state of the parser is ignore, then don't parse the

inline assembly.  Also make sure the remove the ignored statements from the IR.

llvm-svn: 166357

llvm/lib/MC/MCParser/AsmParser.cpp

@@ -1138,7 +1138,7 @@ bool AsmParser::ParseStatement() {
     return ParseDirectiveEndIf(IDLoc);
 
   // If we are in a ".if 0" block, ignore this statement.
-  if (TheCondState.Ignore && !ParsingInlineAsm) {
+  if (TheCondState.Ignore) {
     EatToEndOfStatement();
     return false;
   }
@@ -3579,7 +3579,8 @@ enum AsmOpRewriteKind {
    AOK_Imm,
    AOK_Input,
    AOK_Output,
-   AOK_SizeDirective
+   AOK_SizeDirective,
+   AOK_Skip
 };
 
 struct AsmOpRewrite {
@@ -3619,9 +3620,24 @@ bool AsmParser::ParseMSInlineAsm(void *AsmLoc, std::string &AsmString,
     // Clear the opcode.
     setOpcode(~0x0);
 
+    // Save the conditional ignore state of the parser prior to parsing the statement.
+    bool PreParseCondStateIgnore = TheCondState.Ignore;
+
+    // Save the starting point of this statement in case we need to skip it.
+    SMLoc Start = getLexer().getLoc();
+
     if (ParseStatement())
       return true;
 
+    // If PreParseCondStateIgnore is false, but TheCondState.Ignore is true, then we
+    // just parsed a directive that changed the state to ignore.  Don't skip 
+    // emitting this directive.
+    if (PreParseCondStateIgnore && TheCondState.Ignore) {
+      unsigned Len = getLexer().getLoc().getPointer() - Start.getPointer();
+      AsmStrRewrites.push_back(AsmOpRewrite(AOK_Skip, Start, Len));
+      continue;
+    }
+
     if (isInstruction()) {
       const MCInstrDesc &Desc = MII->get(getOpcode());
 
@@ -3727,8 +3743,15 @@ bool AsmParser::ParseMSInlineAsm(void *AsmLoc, std::string &AsmString,
       OS << StringRef(Start, Loc - Start);
     PrevKind = Kind;
 
+    // Skip the original expression.
+    if (Kind == AOK_Skip) {
+      Start = Loc + (*I).Len;
+      continue;
+    }
+
     // Rewrite expressions in $N notation.
     switch (Kind) {
+    default: break;
     case AOK_Imm:
       OS << Twine("$$") + StringRef(Loc, (*I).Len);
       break;