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add llvm-mc support for parsing the .lcomm directive, patch by Kevin Enderby!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75148 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-07-09 17:25:12 +00:00
parent f0b9effccb
commit 1fc3d75581
5 changed files with 35 additions and 18 deletions
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25
tools/llvm-mc/AsmParser.cpp
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@@ -521,7 +521,9 @@ bool AsmParser::ParseStatement() {
return ParseDirectiveSymbolAttribute(MCStreamer::WeakReference);
if (!strcmp(IDVal, ".comm"))
return ParseDirectiveComm();
return ParseDirectiveComm(/*IsLocal=*/false);
if (!strcmp(IDVal, ".lcomm"))
return ParseDirectiveComm(/*IsLocal=*/true);
Warning(IDLoc, "ignoring directive for now");
EatToEndOfStatement();
@@ -901,8 +903,8 @@ bool AsmParser::ParseDirectiveSymbolAttribute(MCStreamer::SymbolAttr Attr) {
}
/// ParseDirectiveComm
/// ::= .comm identifier , size_expression [ , align_expression ]
bool AsmParser::ParseDirectiveComm() {
/// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
bool AsmParser::ParseDirectiveComm(bool IsLocal) {
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected identifier in directive");
@@ -930,28 +932,29 @@ bool AsmParser::ParseDirectiveComm() {
}
if (Lexer.isNot(asmtok::EndOfStatement))
return TokError("unexpected token in '.comm' directive");
return TokError("unexpected token in '.comm' or '.lcomm' directive");
Lexer.Lex();
// NOTE: a size of zero should create a undefined symbol
// NOTE: a size of zero for a .comm should create a undefined symbol
// but a size of .lcomm creates a bss symbol of size zero.
if (Size < 0)
return Error(SizeLoc, "invalid '.comm' size, can't be less than zero");
return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive 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");
return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
"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);
// Create the Symbol as a common or local common with Size and Pow2Alignment
Out.EmitCommonSymbol(Sym, Size, Pow2Alignment, IsLocal);
return false;
}