// If this is a variable, then recursively evaluate now.
if (S.isVariable()) {
+ if (const MCConstantExpr *C =
+ dyn_cast<const MCConstantExpr>(S.getVariableValue()))
+ return C->getValue();
+
+
MCValue Target;
if (!S.getVariableValue()->EvaluateAsRelocatable(Target, Layout))
report_fatal_error("unable to evaluate offset for variable '" +
// Compute the symbol address.
if (Symbol.isDefined()) {
- if (Symbol.isAbsolute()) {
- Address = cast<MCConstantExpr>(Symbol.getVariableValue())->getValue();
- } else {
- Address = getSymbolAddress(&Data, Layout);
- }
+ Address = getSymbolAddress(&Data, Layout);
} else if (Data.isCommon()) {
// Common symbols are encoded with the size in the address
// field, and their alignment in the flags.
}
}
+void MachObjectWriter::markAbsoluteVariableSymbols(MCAssembler &Asm,
+ const MCAsmLayout &Layout) {
+ for (MCAssembler::symbol_iterator i = Asm.symbol_begin(),
+ e = Asm.symbol_end();
+ i != e; ++i) {
+ MCSymbolData &SD = *i;
+ if (!SD.getSymbol().isVariable())
+ continue;
+
+ // Is the variable is a symbol difference (SA - SB + C) expression,
+ // and neither symbol is external, mark the variable as absolute.
+ const MCExpr *Expr = SD.getSymbol().getVariableValue();
+ MCValue Value;
+ if (Expr->EvaluateAsRelocatable(Value, Layout)) {
+ if (Value.getSymA() && Value.getSymB())
+ const_cast<MCSymbol*>(&SD.getSymbol())->setAbsolute();
+ }
+ }
+}
+
void MachObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm,
const MCAsmLayout &Layout) {
computeSectionAddresses(Asm, Layout);
// Create symbol data for any indirect symbols.
BindIndirectSymbols(Asm);
+ // Mark symbol difference expressions in variables (from .set or = directives)
+ // as absolute.
+ markAbsoluteVariableSymbols(Asm, Layout);
+
// Compute symbol table information and bind symbol indices.
ComputeSymbolTable(Asm, StringTable, LocalSymbolData, ExternalSymbolData,
UndefinedSymbolData);