Add support for the .symver directive. This is really ugly, but most of it is

contained in the ELF object writer.

llvm-svn: 117448

1 files changed, 30 insertions, 0 deletions

diff --git a/llvm/lib/MC/MCParser/ELFAsmParser.cpp b/llvm/lib/MC/MCParser/ELFAsmParser.cpp
index 1970124b2d8..33fdf98bcfc 100644
--- a/llvm/lib/MC/MCParser/ELFAsmParser.cpp
+++ b/llvm/lib/MC/MCParser/ELFAsmParser.cpp
@@ -12,6 +12,7 @@
 #include "llvm/ADT/Twine.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCParser/MCAsmLexer.h"
 #include "llvm/MC/MCSectionELF.h"
 #include "llvm/MC/MCStreamer.h"
@@ -51,6 +52,7 @@ public:
     AddDirectiveHandler<&ELFAsmParser::ParseDirectivePrevious>(".previous");
     AddDirectiveHandler<&ELFAsmParser::ParseDirectiveType>(".type");
     AddDirectiveHandler<&ELFAsmParser::ParseDirectiveIdent>(".ident");
+    AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSymver>(".symver");
   }
 
   // FIXME: Part of this logic is duplicated in the MCELFStreamer. What is
@@ -116,6 +118,7 @@ public:
   bool ParseDirectivePrevious(StringRef, SMLoc);
   bool ParseDirectiveType(StringRef, SMLoc);
   bool ParseDirectiveIdent(StringRef, SMLoc);
+  bool ParseDirectiveSymver(StringRef, SMLoc);
 
 private:
   bool ParseSectionName(StringRef &SectionName);
@@ -377,6 +380,33 @@ bool ELFAsmParser::ParseDirectiveIdent(StringRef, SMLoc) {
   return false;
 }
 
+/// ParseDirectiveSymver
+///  ::= .symver foo, bar2@zed
+bool ELFAsmParser::ParseDirectiveSymver(StringRef, SMLoc) {
+  StringRef Name;
+  if (getParser().ParseIdentifier(Name))
+    return TokError("expected identifier in directive");
+
+  if (getLexer().isNot(AsmToken::Comma))
+    return TokError("expected a comma");
+
+  Lex();
+
+  StringRef AliasName;
+  if (getParser().ParseIdentifier(AliasName))
+    return TokError("expected identifier in directive");
+
+  if (AliasName.find('@') == StringRef::npos)
+    return TokError("expected a '@' in the name");
+
+  MCSymbol *Alias = getContext().GetOrCreateSymbol(AliasName);
+  MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
+  const MCExpr *Value = MCSymbolRefExpr::Create(Sym, getContext());
+
+  getStreamer().EmitAssignment(Alias, Value);
+  return false;
+}
+
 namespace llvm {
 
 MCAsmParserExtension *createELFAsmParser() {