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MCAsmLayout: Add support for computing the symbol offset of variables. Not

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currently used, because variables don't get reported as being "defined".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130524 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2011-04-29 18:20:20 +00:00
parent 90604ab725
commit c8497b6a25
2 changed files with 35 additions and 0 deletions
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27
lib/MC/MCAssembler.cpp
View File

@ -102,6 +102,33 @@ uint64_t MCAsmLayout::getFragmentOffset(const MCFragment *F) 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!");
return getFragmentOffset(SD->getFragment()) + SD->getOffset();
}

8
test/MC/MachO/variable-errors.s Normal file
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@ -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