From 0db58bfecea020ffcdfa1fc6458995371e1c3c50 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Tue, 31 Jan 2012 18:14:05 +0000
Subject: [PATCH] Add assembler dialect attribute in asm parser which lets
 target specific asm parser change dialect on the fly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149396 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/MC/MCParser/MCAsmParser.h    |  1 +
 lib/MC/MCParser/AsmParser.cpp             | 16 ++++++++++++++--
 lib/Target/X86/AsmParser/X86AsmParser.cpp |  7 +++----
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/include/llvm/MC/MCParser/MCAsmParser.h b/include/llvm/MC/MCParser/MCAsmParser.h
index 70df99de4c7..793c7097ba1 100644
--- a/include/llvm/MC/MCParser/MCAsmParser.h
+++ b/include/llvm/MC/MCParser/MCAsmParser.h
@@ -65,6 +65,7 @@ public:
   void setTargetParser(MCTargetAsmParser &P);
 
   virtual unsigned getAssemblerDialect() { return 0;}
+  virtual void setAssemblerDialect(unsigned i) { }
 
   bool getShowParsedOperands() const { return ShowParsedOperands; }
   void setShowParsedOperands(bool Value) { ShowParsedOperands = Value; }
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 01f68e3dca8..dad72d2050a 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -123,6 +123,9 @@ private:
   int64_t CppHashLineNumber;
   SMLoc CppHashLoc;
 
+  /// AssemblerDialect. ~OU means unset value and use value provided by MAI.
+  unsigned AssemblerDialect;
+
 public:
   AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
             const MCAsmInfo &MAI);
@@ -144,7 +147,15 @@ public:
   virtual MCAsmLexer &getLexer() { return Lexer; }
   virtual MCContext &getContext() { return Ctx; }
   virtual MCStreamer &getStreamer() { return Out; }
-  virtual unsigned getAssemblerDialect() { return MAI.getAssemblerDialect(); }
+  virtual unsigned getAssemblerDialect() { 
+    if (AssemblerDialect == ~0U)
+      return MAI.getAssemblerDialect(); 
+    else
+      return AssemblerDialect;
+  }
+  virtual void setAssemblerDialect(unsigned i) {
+    AssemblerDialect = i;
+  }
 
   virtual bool Warning(SMLoc L, const Twine &Msg,
                        ArrayRef<SMRange> Ranges = ArrayRef<SMRange>());
@@ -369,7 +380,8 @@ AsmParser::AsmParser(SourceMgr &_SM, MCContext &_Ctx,
                      MCStreamer &_Out, const MCAsmInfo &_MAI)
   : Lexer(_MAI), Ctx(_Ctx), Out(_Out), MAI(_MAI), SrcMgr(_SM),
     GenericParser(new GenericAsmParser), PlatformParser(0),
-    CurBuffer(0), MacrosEnabled(true), CppHashLineNumber(0) {
+    CurBuffer(0), MacrosEnabled(true), CppHashLineNumber(0), 
+    AssemblerDialect(~0U) {
   // Save the old handler.
   SavedDiagHandler = SrcMgr.getDiagHandler();
   SavedDiagContext = SrcMgr.getDiagContext();
diff --git a/lib/Target/X86/AsmParser/X86AsmParser.cpp b/lib/Target/X86/AsmParser/X86AsmParser.cpp
index fd6efa63276..a1f1d5cf8b6 100644
--- a/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -34,7 +34,6 @@ struct X86Operand;
 class X86AsmParser : public MCTargetAsmParser {
   MCSubtargetInfo &STI;
   MCAsmParser &Parser;
-  bool IntelSyntax;
 private:
   MCAsmParser &getParser() const { return Parser; }
 
@@ -94,7 +93,7 @@ private:
 
 public:
   X86AsmParser(MCSubtargetInfo &sti, MCAsmParser &parser)
-    : MCTargetAsmParser(), STI(sti), Parser(parser), IntelSyntax(false) {
+    : MCTargetAsmParser(), STI(sti), Parser(parser) {
 
     // Initialize the set of available features.
     setAvailableFeatures(ComputeAvailableFeatures(STI.getFeatureBits()));
@@ -107,7 +106,7 @@ public:
   virtual bool ParseDirective(AsmToken DirectiveID);
 
   bool isParsingIntelSyntax() {
-    return IntelSyntax || getParser().getAssemblerDialect();
+    return getParser().getAssemblerDialect();
   }
 };
 } // end anonymous namespace
@@ -1646,7 +1645,7 @@ bool X86AsmParser::ParseDirective(AsmToken DirectiveID) {
   else if (IDVal.startswith(".code"))
     return ParseDirectiveCode(IDVal, DirectiveID.getLoc());
   else if (IDVal.startswith(".intel_syntax")) {
-    IntelSyntax = true;
+    getParser().setAssemblerDialect(1);
     if (getLexer().isNot(AsmToken::EndOfStatement)) {
       if(Parser.getTok().getString() == "noprefix") {
 	// FIXME : Handle noprefix
-- 
2.34.1