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Fix an asan use-after-free bug introduced by the asm printer

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changes to remove non-Function based subtargets out of the asm
printer. For module level emission we'll need to construct up
an MCSubtargetInfo so that we can encode instructions for
emission.

llvm-svn: 230050
This commit is contained in:
Eric Christopher 2015-02-20 19:54:07 +00:00
parent 10e2fab7a3
commit dc11957da0
1 changed files with 11 additions and 1 deletions
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12
lib/Target/PowerPC/PPCAsmPrinter.cpp
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@ -1303,7 +1303,17 @@ static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
void PPCDarwinAsmPrinter::
EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
// Construct a local MCSubtargetInfo and shadow EmitToStreamer here.
// This is because the MachineFunction won't exist (but have not yet been
// freed) and since we're at the global level we can use the default
// constructed subtarget.
std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
TM.getTargetTriple(), TM.getTargetCPU(), TM.getTargetFeatureString()));
auto EmitToStreamer = [&STI] (MCStreamer &S, const MCInst &Inst) {
S.EmitInstruction(Inst, *STI);
};
const TargetLoweringObjectFileMachO &TLOFMacho =
static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());