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Implement parsing support for the .comm directive. Patch by

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Kevin Enderby!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74944 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-07-07 20:30:46 +00:00
parent 74a77812d1
commit 4e4db7adfc
5 changed files with 90 additions and 0 deletions
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59
tools/llvm-mc/AsmParser.cpp
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@ -520,6 +520,9 @@ bool AsmParser::ParseStatement() {
if (!strcmp(IDVal, ".weak_reference"))
return ParseDirectiveSymbolAttribute(MCStreamer::WeakReference);
if (!strcmp(IDVal, ".comm"))
return ParseDirectiveComm();
Warning(IDLoc, "ignoring directive for now");
EatToEndOfStatement();
return false;
@ -896,3 +899,59 @@ bool AsmParser::ParseDirectiveSymbolAttribute(MCStreamer::SymbolAttr Attr) {
Lexer.Lex();
return false;
}
/// ParseDirectiveComm
/// ::= .comm identifier , size_expression [ , align_expression ]
bool AsmParser::ParseDirectiveComm() {
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 directive");
Lexer.Lex();
int64_t Size;
SMLoc SizeLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Size))
return true;
int64_t Pow2Alignment = 0;
SMLoc Pow2AlignmentLoc;
if (Lexer.is(asmtok::Comma)) {
Lexer.Lex();
Pow2AlignmentLoc = Lexer.getLoc();
if (ParseAbsoluteExpression(Pow2Alignment))
return true;
}
if (Lexer.isNot(asmtok::EndOfStatement))
return TokError("unexpected token in '.comm' directive");
Lexer.Lex();
// NOTE: a size of zero should create a undefined symbol
if (Size < 0)
return Error(SizeLoc, "invalid '.comm' size, can't be less than zero");
// NOTE: The alignment in the directive is a power of 2 value, the assember
// may internally end up wanting an alignment in bytes.
// FIXME: Diagnose overflow.
if (Pow2Alignment < 0)
return Error(Pow2AlignmentLoc, "invalid '.comm' alignment, can't be less "
"than zero");
// TODO: Symbol must be undefined or it is a error to re-defined the symbol
if (Sym->getSection() || Ctx.GetSymbolValue(Sym))
return Error(IDLoc, "invalid symbol redefinition");
// TODO: Symbol to be made into a common with this Size and Pow2Alignment
Out.EmitCommonSymbol(Sym, Size, Pow2Alignment);
return false;
}