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Change MCExpr::EvaluateAsRelocatableImpl of variables to return the original

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variable if recursing fails to simplify it.

Factor AliasedSymbol to be a method of MCSymbol.

Update MCAssembler::EvaluateFixup to match the change in
EvaluateAsRelocatableImpl.

Remove the WeakRefExpr hack, as the object writer now sees the weakref with
no extra effort needed.

Nothing else is using MCTargetExpr, but keep it for now.

Now that the ELF writer sees relocations with aliases, handle

    .weak    foo2
foo2:
    .weak    bar2
    .set    bar2,foo2
    .quad    bar2

the same way gas does and produce a relocation with bar2.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119152 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2010-11-15 16:33:49 +00:00
parent d3443e99e4
commit 94ed5fca3f
7 changed files with 90 additions and 115 deletions
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12
lib/MC/MCSymbol.cpp
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@ -39,6 +39,18 @@ static bool NameNeedsQuoting(StringRef Str) {
return false;
}
const MCSymbol &MCSymbol::AliasedSymbol() const {
const MCSymbol *S = this;
while (S->isVariable()) {
const MCExpr *Value = S->getVariableValue();
if (Value->getKind() != MCExpr::SymbolRef)
return *S;
const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value);
S = &Ref->getSymbol();
}
return *S;
}
void MCSymbol::setVariableValue(const MCExpr *Value) {
assert(!IsUsed && "Cannot set a variable that has already been used.");
assert(Value && "Invalid variable value!");