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llvm-mc: Clean up some handling of symbol/section association to be more correct

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(external was really undefined and there wasn't an explicit representation for
absolute symbols).
 - This still needs some cleanup to how the absolute "pseudo" section is dealt
   with, but I haven't figured out the nicest approach yet.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79733 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar
2009-08-22 07:22:36 +00:00
parent 66aa9b1c2f
commit 8906ff1b9d
7 changed files with 153 additions and 63 deletions
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26
tools/llvm-mc/AsmParser.cpp
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@@ -149,10 +149,6 @@ bool AsmParser::ParsePrimaryExpr(AsmExpr *&Res) {
// This is a label, this should be parsed as part of an expression, to
// handle things like LFOO+4.
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Lexer.getTok().getIdentifier());
// If this is use of an undefined symbol then mark it external.
if (!Sym->getSection() && !Ctx.GetSymbolValue(Sym))
Sym->setExternal(true);
Res = new AsmSymbolRefExpr(Sym);
Lexer.Lex(); // Eat identifier.
@@ -376,10 +372,8 @@ bool AsmParser::ParseStatement() {
// FIXME: This doesn't diagnose assignment to a symbol which has been
// implicitly marked as external.
MCSymbol *Sym = Ctx.GetOrCreateSymbol(IDVal);
if (Sym->getSection())
if (!Sym->isUndefined())
return Error(IDLoc, "invalid symbol redefinition");
if (Ctx.GetSymbolValue(Sym))
return Error(IDLoc, "symbol already used as assembler variable");
// Since we saw a label, create a symbol and emit it.
// FIXME: If the label starts with L it is an assembler temporary label.
@@ -687,15 +681,11 @@ bool AsmParser::ParseAssignment(const StringRef &Name, bool IsDotSet) {
// Diagnose assignment to a label.
//
// FIXME: Diagnostics. Note the location of the definition as a label.
// FIXME: This doesn't diagnose assignment to a symbol which has been
// implicitly marked as external.
// FIXME: Handle '.'.
// FIXME: Diagnose assignment to protected identifier (e.g., register name).
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name);
if (Sym->getSection())
return Error(EqualLoc, "invalid assignment to symbol emitted as a label");
if (Sym->isExternal())
return Error(EqualLoc, "invalid assignment to external symbol");
if (!Sym->isUndefined() && !Sym->isAbsolute())
return Error(EqualLoc, "symbol has already been defined");
// Do the assignment.
Out.EmitAssignment(Sym, Value, IsDotSet);
@@ -1117,10 +1107,6 @@ bool AsmParser::ParseDirectiveSymbolAttribute(MCStreamer::SymbolAttr Attr) {
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name);
// If this is use of an undefined symbol then mark it external.
if (!Sym->getSection() && !Ctx.GetSymbolValue(Sym))
Sym->setExternal(true);
Out.EmitSymbolAttribute(Sym, Attr);
if (Lexer.is(AsmToken::EndOfStatement))
@@ -1213,8 +1199,7 @@ bool AsmParser::ParseDirectiveComm(bool IsLocal) {
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))
if (!Sym->isUndefined())
return Error(IDLoc, "invalid symbol redefinition");
// Create the Symbol as a common or local common with Size and Pow2Alignment
@@ -1305,8 +1290,7 @@ bool AsmParser::ParseDirectiveDarwinZerofill() {
return Error(Pow2AlignmentLoc, "invalid '.zerofill' 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))
if (!Sym->isUndefined())
return Error(IDLoc, "invalid symbol redefinition");
// FIXME: Arch specific.