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llvm-mc: Clean up some handling of symbol/section association to be more correct
(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
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@@ -149,10 +149,6 @@ bool AsmParser::ParsePrimaryExpr(AsmExpr *&Res) {
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// This is a label, this should be parsed as part of an expression, to
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// handle things like LFOO+4.
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Lexer.getTok().getIdentifier());
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// If this is use of an undefined symbol then mark it external.
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if (!Sym->getSection() && !Ctx.GetSymbolValue(Sym))
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Sym->setExternal(true);
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Res = new AsmSymbolRefExpr(Sym);
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Lexer.Lex(); // Eat identifier.
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@@ -376,10 +372,8 @@ bool AsmParser::ParseStatement() {
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// FIXME: This doesn't diagnose assignment to a symbol which has been
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// implicitly marked as external.
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(IDVal);
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if (Sym->getSection())
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if (!Sym->isUndefined())
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return Error(IDLoc, "invalid symbol redefinition");
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if (Ctx.GetSymbolValue(Sym))
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return Error(IDLoc, "symbol already used as assembler variable");
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// Since we saw a label, create a symbol and emit it.
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// FIXME: If the label starts with L it is an assembler temporary label.
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@@ -687,15 +681,11 @@ bool AsmParser::ParseAssignment(const StringRef &Name, bool IsDotSet) {
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// Diagnose assignment to a label.
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//
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// FIXME: Diagnostics. Note the location of the definition as a label.
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// FIXME: This doesn't diagnose assignment to a symbol which has been
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// implicitly marked as external.
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// FIXME: Handle '.'.
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// FIXME: Diagnose assignment to protected identifier (e.g., register name).
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name);
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if (Sym->getSection())
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return Error(EqualLoc, "invalid assignment to symbol emitted as a label");
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if (Sym->isExternal())
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return Error(EqualLoc, "invalid assignment to external symbol");
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if (!Sym->isUndefined() && !Sym->isAbsolute())
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return Error(EqualLoc, "symbol has already been defined");
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// Do the assignment.
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Out.EmitAssignment(Sym, Value, IsDotSet);
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@@ -1117,10 +1107,6 @@ bool AsmParser::ParseDirectiveSymbolAttribute(MCStreamer::SymbolAttr Attr) {
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name);
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// If this is use of an undefined symbol then mark it external.
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if (!Sym->getSection() && !Ctx.GetSymbolValue(Sym))
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Sym->setExternal(true);
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Out.EmitSymbolAttribute(Sym, Attr);
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if (Lexer.is(AsmToken::EndOfStatement))
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@@ -1213,8 +1199,7 @@ bool AsmParser::ParseDirectiveComm(bool IsLocal) {
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return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
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"alignment, can't be less than zero");
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// TODO: Symbol must be undefined or it is a error to re-defined the symbol
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if (Sym->getSection() || Ctx.GetSymbolValue(Sym))
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if (!Sym->isUndefined())
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return Error(IDLoc, "invalid symbol redefinition");
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// Create the Symbol as a common or local common with Size and Pow2Alignment
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@@ -1305,8 +1290,7 @@ bool AsmParser::ParseDirectiveDarwinZerofill() {
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return Error(Pow2AlignmentLoc, "invalid '.zerofill' directive alignment, "
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"can't be less than zero");
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// TODO: Symbol must be undefined or it is a error to re-defined the symbol
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if (Sym->getSection() || Ctx.GetSymbolValue(Sym))
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if (!Sym->isUndefined())
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return Error(IDLoc, "invalid symbol redefinition");
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// FIXME: Arch specific.
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