[llvm] r347041 - [MSP430] Add support for .refsym directive

[Anton Korobeynikov via llvm-commits]

Author: asl
Date: Fri Nov 16 01:50:24 2018
New Revision: 347041

URL: http://llvm.org/viewvc/llvm-project?rev=347041&view=rev
Log:
[MSP430] Add support for .refsym directive

Introduces support for '.refsym' assembler directive.

>From GCC docs (for MSP430):
'.refsym' - This directive instructs assembler to add an undefined reference
to the symbol following the directive. No relocation is created for this symbol;
it will exist purely for pulling in object files from archives.

Patch by Kristina Bessonova!

Differential Revision: https://reviews.llvm.org/D54618


Added:
    llvm/trunk/test/MC/MSP430/refsym.s
Modified:
    llvm/trunk/lib/Target/MSP430/AsmParser/MSP430AsmParser.cpp

Modified: llvm/trunk/lib/Target/MSP430/AsmParser/MSP430AsmParser.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/MSP430/AsmParser/MSP430AsmParser.cpp?rev=347041&r1=347040&r2=347041&view=diff
==============================================================================
--- llvm/trunk/lib/Target/MSP430/AsmParser/MSP430AsmParser.cpp (original)
+++ llvm/trunk/lib/Target/MSP430/AsmParser/MSP430AsmParser.cpp Fri Nov 16 01:50:24 2018
@@ -51,6 +51,7 @@ class MSP430AsmParser : public MCTargetA
                         SMLoc NameLoc, OperandVector &Operands) override;
 
   bool ParseDirective(AsmToken DirectiveID) override;
+  bool ParseDirectiveRefSym(AsmToken DirectiveID);
 
   unsigned validateTargetOperandClass(MCParsedAsmOperand &Op,
                                       unsigned Kind) override;
@@ -407,6 +408,16 @@ bool MSP430AsmParser::ParseInstruction(P
   return false;
 }
 
+bool MSP430AsmParser::ParseDirectiveRefSym(AsmToken DirectiveID) {
+    StringRef Name;
+    if (getParser().parseIdentifier(Name))
+      return TokError("expected identifier in directive");
+
+    MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
+    getStreamer().EmitSymbolAttribute(Sym, MCSA_Global);
+    return false;
+}
+
 bool MSP430AsmParser::ParseDirective(AsmToken DirectiveID) {
   StringRef IDVal = DirectiveID.getIdentifier();
   if (IDVal.lower() == ".long") {
@@ -415,6 +426,8 @@ bool MSP430AsmParser::ParseDirective(Asm
     ParseLiteralValues(2, DirectiveID.getLoc());
   } else if (IDVal.lower() == ".byte") {
     ParseLiteralValues(1, DirectiveID.getLoc());
+  } else if (IDVal.lower() == ".refsym") {
+    return ParseDirectiveRefSym(DirectiveID);
   }
   return true;
 }

Added: llvm/trunk/test/MC/MSP430/refsym.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/MSP430/refsym.s?rev=347041&view=auto
==============================================================================
--- llvm/trunk/test/MC/MSP430/refsym.s (added)
+++ llvm/trunk/test/MC/MSP430/refsym.s Fri Nov 16 01:50:24 2018
@@ -0,0 +1,14 @@
+# RUN: llvm-mc -filetype=obj -triple=msp430 %s | llvm-readobj -t - | FileCheck %s
+
+foo:
+  .refsym __hook
+
+; CHECK:       Symbol {
+; CHECK:         Name: __hook (30)
+; CHECK-NEXT:    Value: 0x0
+; CHECK-NEXT:    Size: 0
+; CHECK-NEXT:    Binding: Global (0x1)
+; CHECK-NEXT:    Type: None (0x0)
+; CHECK-NEXT:    Other: 0
+; CHECK-NEXT:    Section: Undefined (0x0)
+; CHECK-NEXT:  }