Add support for parsing the ELF .type assembler directive.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104316 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCParser/AsmParser.h

@@ -131,6 +131,7 @@ private:
   /// ParseDirectiveSymbolAttribute - Parse a directive like ".globl" which
   /// accepts a single symbol (which should be a label or an external).
   bool ParseDirectiveSymbolAttribute(MCSymbolAttr Attr);
+  bool ParseDirectiveELFType(); // ELF specific ".type"
   bool ParseDirectiveDarwinSymbolDesc(); // Darwin specific ".desc"
   bool ParseDirectiveDarwinLsym(); // Darwin specific ".lsym"
 

include/llvm/MC/MCParser/MCAsmLexer.h

@@ -47,7 +47,7 @@ public:
     Pipe, PipePipe, Caret, 
     Amp, AmpAmp, Exclaim, ExclaimEqual, Percent, Hash,
     Less, LessEqual, LessLess, LessGreater,
-    Greater, GreaterEqual, GreaterGreater
+    Greater, GreaterEqual, GreaterGreater, At
   };
 
   TokenKind Kind;

lib/MC/MCParser/AsmLexer.cpp

@@ -281,6 +281,7 @@ AsmToken AsmLexer::LexToken() {
   case '*': return AsmToken(AsmToken::Star, StringRef(TokStart, 1));
   case ',': return AsmToken(AsmToken::Comma, StringRef(TokStart, 1));
   case '$': return AsmToken(AsmToken::Dollar, StringRef(TokStart, 1));
+  case '@': return AsmToken(AsmToken::At, StringRef(TokStart, 1));
   case '=': 
     if (*CurPtr == '=')
       return ++CurPtr, AsmToken(AsmToken::EqualEqual, StringRef(TokStart, 2));

lib/MC/MCParser/AsmParser.cpp

@@ -13,6 +13,7 @@
 
 #include "llvm/MC/MCParser/AsmParser.h"
 #include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringSwitch.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
@@ -738,6 +739,8 @@ bool AsmParser::ParseStatement() {
       return ParseDirectiveSymbolAttribute(MCSA_Protected);
     if (IDVal == ".reference")
       return ParseDirectiveSymbolAttribute(MCSA_Reference);
+    if (IDVal == ".type")
+      return ParseDirectiveELFType();
     if (IDVal == ".weak")
       return ParseDirectiveSymbolAttribute(MCSA_Weak);
     if (IDVal == ".weak_definition")
@@ -1307,6 +1310,52 @@ bool AsmParser::ParseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
   return false;  
 }
 
+/// ParseDirectiveELFType
+///  ::= .type identifier , @attribute
+bool AsmParser::ParseDirectiveELFType() {
+  StringRef Name;
+  if (ParseIdentifier(Name))
+    return TokError("expected identifier in directive");
+
+  // Handle the identifier as the key symbol.
+  MCSymbol *Sym = CreateSymbol(Name);
+
+  if (Lexer.isNot(AsmToken::Comma))
+    return TokError("unexpected token in '.type' directive");
+  Lex();
+
+  if (Lexer.isNot(AsmToken::At))
+    return TokError("expected '@' before type");
+  Lex();
+
+  StringRef Type;
+  SMLoc TypeLoc;
+
+  TypeLoc = Lexer.getLoc();
+  if (ParseIdentifier(Type))
+    return TokError("expected symbol type in directive");
+
+  MCSymbolAttr Attr = StringSwitch<MCSymbolAttr>(Type)
+    .Case("function", MCSA_ELF_TypeFunction)
+    .Case("object", MCSA_ELF_TypeObject)
+    .Case("tls_object", MCSA_ELF_TypeTLS)
+    .Case("common", MCSA_ELF_TypeCommon)
+    .Case("notype", MCSA_ELF_TypeNoType)
+    .Default(MCSA_Invalid);
+
+  if (Attr == MCSA_Invalid)
+    return Error(TypeLoc, "unsupported attribute in '.type' directive");
+
+  if (Lexer.isNot(AsmToken::EndOfStatement))
+    return TokError("unexpected token in '.type' directive");
+
+  Lex();
+
+  Out.EmitSymbolAttribute(Sym, Attr);
+
+  return false;
+}
+
 /// ParseDirectiveDarwinSymbolDesc
 ///  ::= .desc identifier , expression
 bool AsmParser::ParseDirectiveDarwinSymbolDesc() {