MCAsmLayout: Add support for computing the symbol offset of variables. Not
currently used, because variables don't get reported as being "defined". llvm-svn: 130524
This commit is contained in:
parent
bea7b93c88
commit
72032861c6
|
@ -102,6 +102,33 @@ uint64_t MCAsmLayout::getFragmentOffset(const MCFragment *F) const {
|
||||||
}
|
}
|
||||||
|
|
||||||
uint64_t MCAsmLayout::getSymbolOffset(const MCSymbolData *SD) const {
|
uint64_t MCAsmLayout::getSymbolOffset(const MCSymbolData *SD) const {
|
||||||
|
const MCSymbol &S = SD->getSymbol();
|
||||||
|
|
||||||
|
// If this is a variable, then recursively evaluate now.
|
||||||
|
if (S.isVariable()) {
|
||||||
|
MCValue Target;
|
||||||
|
if (!S.getVariableValue()->EvaluateAsRelocatable(Target, *this))
|
||||||
|
report_fatal_error("unable to evaluate offset for variable '" +
|
||||||
|
S.getName() + "'");
|
||||||
|
|
||||||
|
// Verify that any used symbols are defined.
|
||||||
|
if (Target.getSymA() && Target.getSymA()->getSymbol().isUndefined())
|
||||||
|
report_fatal_error("unable to evaluate offset to undefined symbol '" +
|
||||||
|
Target.getSymA()->getSymbol().getName() + "'");
|
||||||
|
if (Target.getSymB() && Target.getSymB()->getSymbol().isUndefined())
|
||||||
|
report_fatal_error("unable to evaluate offset to undefined symbol '" +
|
||||||
|
Target.getSymB()->getSymbol().getName() + "'");
|
||||||
|
|
||||||
|
uint64_t Offset = Target.getConstant();
|
||||||
|
if (Target.getSymA())
|
||||||
|
Offset += getSymbolOffset(&Assembler.getSymbolData(
|
||||||
|
Target.getSymA()->getSymbol()));
|
||||||
|
if (Target.getSymB())
|
||||||
|
Offset -= getSymbolOffset(&Assembler.getSymbolData(
|
||||||
|
Target.getSymB()->getSymbol()));
|
||||||
|
return Offset;
|
||||||
|
}
|
||||||
|
|
||||||
assert(SD->getFragment() && "Invalid getOffset() on undefined symbol!");
|
assert(SD->getFragment() && "Invalid getOffset() on undefined symbol!");
|
||||||
return getFragmentOffset(SD->getFragment()) + SD->getOffset();
|
return getFragmentOffset(SD->getFragment()) + SD->getOffset();
|
||||||
}
|
}
|
||||||
|
|
|
@ -0,0 +1,8 @@
|
||||||
|
// RUN: not llvm-mc -triple x86_64-apple-darwin10 %s -filetype=obj -o %t.o 2> %t.err
|
||||||
|
// RUN: FileCheck < %t.err %s
|
||||||
|
|
||||||
|
.data
|
||||||
|
t0_a:
|
||||||
|
t0_x = t0_a - t0_b
|
||||||
|
// CHECK: unable to evaluate offset to undefined symbol 't0_b'
|
||||||
|
.long t0_x
|
Loading…
Reference in New Issue