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Don't crash in a strange .size directive.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115684 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2010-10-05 21:02:45 +00:00
parent 748a2fe917
commit 62fed8bd38
2 changed files with 24 additions and 5 deletions
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20
lib/MC/ELFObjectWriter.cpp
View File

@ -445,12 +445,22 @@ void ELFObjectWriterImpl::WriteSymbol(MCDataFragment *F, ELFSymbolData &MSD,
const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(ESize);
if (BE->EvaluateAsRelocatable(Res, &Layout)) {
MCSymbolData &A =
Layout.getAssembler().getSymbolData(Res.getSymA()->getSymbol());
MCSymbolData &B =
Layout.getAssembler().getSymbolData(Res.getSymB()->getSymbol());
uint64_t AddressA = 0;
uint64_t AddressB = 0;
const MCSymbol &SymA = Res.getSymA()->getSymbol();
const MCSymbol &SymB = Res.getSymB()->getSymbol();
Size = Layout.getSymbolAddress(&A) - Layout.getSymbolAddress(&B);
if (SymA.isDefined()) {
MCSymbolData &A = Layout.getAssembler().getSymbolData(SymA);
AddressA = Layout.getSymbolAddress(&A);
}
if (SymB.isDefined()) {
MCSymbolData &B = Layout.getAssembler().getSymbolData(SymB);
AddressB = Layout.getSymbolAddress(&B);
}
Size = AddressA - AddressB;
}
} else if (ESize->getKind() == MCExpr::Constant) {
Size = static_cast<const MCConstantExpr *>(ESize)->getValue();

9
test/MC/ELF/size.s Normal file
View File

@ -0,0 +1,9 @@
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump | FileCheck %s
// Mostly a test that this doesn't crash anymore.
// CHECK: # Symbol 4
// CHECK-NEXT: (('st_name', 1) # 'foo'
// CHECK-NEXT: ('st_bind', 1)
.size foo, .Lbar-foo