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MC: When parsing a variable reference, substitute absolute variables immediately

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since they are allowed to be redefined.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84230 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar
2009-10-16 01:34:54 +00:00
parent 7c3600de94
commit fffff915d5
4 changed files with 43 additions and 14 deletions
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19
tools/llvm-mc/AsmParser.cpp
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@ -21,6 +21,7 @@
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmParser.h"
@ -220,12 +221,22 @@ bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res) {
Res = MCUnaryExpr::CreateLNot(Res, getContext());
return false;
case AsmToken::String:
case AsmToken::Identifier:
// This is a label, this should be parsed as part of an expression, to
// handle things like LFOO+4.
Res = MCSymbolRefExpr::Create(Lexer.getTok().getIdentifier(), getContext());
case AsmToken::Identifier: {
// This is a symbol reference.
MCSymbol *Sym = CreateSymbol(Lexer.getTok().getIdentifier());
Lexer.Lex(); // Eat identifier.
// If this is an absolute variable reference, substitute it now to preserve
// semantics in the face of reassignment.
if (Sym->getValue() && isa<MCConstantExpr>(Sym->getValue())) {
Res = Sym->getValue();
return false;
}
// Otherwise create a symbol ref.
Res = MCSymbolRefExpr::Create(Sym, getContext());
return false;
}
case AsmToken::Integer:
Res = MCConstantExpr::Create(Lexer.getTok().getIntVal(), getContext());
Lexer.Lex(); // Eat token.