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[MSP430] Add support for .refsym directive

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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

llvm-svn: 347041
This commit is contained in:
Anton Korobeynikov 2018-11-16 09:50:24 +00:00
parent dd107226b3
commit 9b1cbb8f4a
2 changed files with 27 additions and 0 deletions
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13
lib/Target/MSP430/AsmParser/MSP430AsmParser.cpp
View File

@ -51,6 +51,7 @@ class MSP430AsmParser : public MCTargetAsmParser {
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(ParseInstructionInfo &Info,
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(AsmToken DirectiveID) {
ParseLiteralValues(2, DirectiveID.getLoc());
} else if (IDVal.lower() == ".byte") {
ParseLiteralValues(1, DirectiveID.getLoc());
} else if (IDVal.lower() == ".refsym") {
return ParseDirectiveRefSym(DirectiveID);
}
return true;
}

14
test/MC/MSP430/refsym.s Normal file
View File

@ -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: }