Added llvm-mc support for parsing the .desc directive.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75645 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 34 insertions, 0 deletions

diff --git a/tools/llvm-mc/AsmParser.cpp b/tools/llvm-mc/AsmParser.cpp
index c105801632..d94b7b3270 100644
--- a/tools/llvm-mc/AsmParser.cpp
+++ b/tools/llvm-mc/AsmParser.cpp
@@ -526,6 +526,8 @@ bool AsmParser::ParseStatement() {
       return ParseDirectiveComm(/*IsLocal=*/true);
     if (!strcmp(IDVal, ".zerofill"))
       return ParseDirectiveDarwinZerofill();
+    if (!strcmp(IDVal, ".desc"))
+      return ParseDirectiveDarwinSymbolDesc();
 
     if (!strcmp(IDVal, ".subsections_via_symbols"))
       return ParseDirectiveDarwinSubsectionsViaSymbols();
@@ -909,6 +911,37 @@ bool AsmParser::ParseDirectiveSymbolAttribute(MCStreamer::SymbolAttr Attr) {
   return false;  
 }
 
+/// ParseDirectiveDarwinSymbolDesc
+///  ::= .desc identifier , expression
+bool AsmParser::ParseDirectiveDarwinSymbolDesc() {
+  if (Lexer.isNot(asmtok::Identifier))
+    return TokError("expected identifier in directive");
+  
+  // handle the identifier as the key symbol.
+  SMLoc IDLoc = Lexer.getLoc();
+  MCSymbol *Sym = Ctx.GetOrCreateSymbol(Lexer.getCurStrVal());
+  Lexer.Lex();
+
+  if (Lexer.isNot(asmtok::Comma))
+    return TokError("unexpected token in '.desc' directive");
+  Lexer.Lex();
+
+  SMLoc DescLoc = Lexer.getLoc();
+  int64_t DescValue;
+  if (ParseAbsoluteExpression(DescValue))
+    return true;
+
+  if (Lexer.isNot(asmtok::EndOfStatement))
+    return TokError("unexpected token in '.desc' directive");
+  
+  Lexer.Lex();
+
+  // Set the n_desc field of this Symbol to this DescValue
+  Out.EmitSymbolDesc(Sym, DescValue);
+
+  return false;
+}
+
 /// ParseDirectiveComm
 ///  ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
 bool AsmParser::ParseDirectiveComm(bool IsLocal) {
diff --git a/tools/llvm-mc/AsmParser.h b/tools/llvm-mc/AsmParser.h
index da546732a7..b4f5e2d428 100644
--- a/tools/llvm-mc/AsmParser.h
+++ b/tools/llvm-mc/AsmParser.h
@@ -109,6 +109,7 @@ private:
   /// ParseDirectiveSymbolAttribute - Parse a directive like ".globl" which
   /// accepts a single symbol (which should be a label or an external).
   bool ParseDirectiveSymbolAttribute(MCStreamer::SymbolAttr Attr);
+  bool ParseDirectiveDarwinSymbolDesc(); // Darwin specific ".desc"
 
   bool ParseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"
   bool ParseDirectiveDarwinZerofill(); // Darwin specific ".zerofill"