From ce4bec8e0ce57f3e11fb34db49cf81ffdf216f78 Mon Sep 17 00:00:00 2001
From: Kevin Enderby <enderby@apple.com>
Date: Thu, 10 Sep 2009 20:51:44 +0000
Subject: Added the ParseInstruction() hook for target specific assembler
 directives so that things like .word can be parsed as target specific.  Moved
 parsing .word out of AsmParser.cpp into X86AsmParser.cpp as it is 2 bytes on
 X86 and 4 bytes for other targets that support the .word directive.

llvm-svn: 81461
---
 llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp | 39 +++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

(limited to 'llvm/lib')

diff --git a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
index e5f23e018bf..aa04ba60d37 100644
--- a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -12,6 +12,7 @@
 #include "llvm/ADT/Twine.h"
 #include "llvm/MC/MCAsmLexer.h"
 #include "llvm/MC/MCAsmParser.h"
+#include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCInst.h"
 #include "llvm/Support/SourceMgr.h"
@@ -39,7 +40,9 @@ private:
   bool ParseOperand(X86Operand &Op);
 
   bool ParseMemOperand(X86Operand &Op);
-  
+
+  bool ParseDirectiveWord(unsigned Size, SMLoc L);
+
   /// @name Auto-generated Match Functions
   /// {  
 
@@ -57,6 +60,8 @@ public:
     : TargetAsmParser(T), Parser(_Parser) {}
 
   virtual bool ParseInstruction(const StringRef &Name, MCInst &Inst);
+
+  virtual bool ParseDirective(AsmToken DirectiveID);
 };
   
 } // end anonymous namespace
@@ -432,6 +437,38 @@ bool X86ATTAsmParser::ParseInstruction(const StringRef &Name, MCInst &Inst) {
   return true;
 }
 
+bool X86ATTAsmParser::ParseDirective(AsmToken DirectiveID) {
+  StringRef IDVal = DirectiveID.getIdentifier();
+  if (IDVal == ".word")
+    return ParseDirectiveWord(2, DirectiveID.getLoc());
+  return true;
+}
+
+/// ParseDirectiveWord
+///  ::= .word [ expression (, expression)* ]
+bool X86ATTAsmParser::ParseDirectiveWord(unsigned Size, SMLoc L) {
+  if (getLexer().isNot(AsmToken::EndOfStatement)) {
+    for (;;) {
+      const MCExpr *Value;
+      if (getParser().ParseExpression(Value))
+        return true;
+
+      getParser().getStreamer().EmitValue(Value, Size);
+
+      if (getLexer().is(AsmToken::EndOfStatement))
+        break;
+      
+      // FIXME: Improve diagnostic.
+      if (getLexer().isNot(AsmToken::Comma))
+        return Error(L, "unexpected token in directive");
+      getLexer().Lex();
+    }
+  }
+
+  getLexer().Lex();
+  return false;
+}
+
 // Force static initialization.
 extern "C" void LLVMInitializeX86AsmParser() {
   RegisterAsmParser<X86ATTAsmParser> X(TheX86_32Target);
-- 
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