Roots.push_back(GCRoot(Num, Metadata));
}
+ /// removeStackRoot - Removes a root.
+ roots_iterator removeStackRoot(roots_iterator position) {
+ return Roots.erase(position);
+ }
+
/// addSafePoint - Notes the existence of a safe point. Num is the ID of the
/// label just prior to the safe point (if the code generator is using
/// MachineModuleInfo).
const TargetFrameLowering *TFI = TM->getFrameLowering();
assert(TFI && "TargetRegisterInfo not available!");
- for (GCFunctionInfo::roots_iterator RI = FI->roots_begin(),
- RE = FI->roots_end(); RI != RE; ++RI)
- RI->StackOffset = TFI->getFrameIndexOffset(MF, RI->Num);
+ for (GCFunctionInfo::roots_iterator RI = FI->roots_begin();
+ RI != FI->roots_end();) {
+ // If the root references a dead object, no need to keep it.
+ if (MF.getFrameInfo()->isDeadObjectIndex(RI->Num)) {
+ RI = FI->removeStackRoot(RI);
+ } else {
+ RI->StackOffset = TFI->getFrameIndexOffset(MF, RI->Num);
+ ++RI;
+ }
+ }
}
bool GCMachineCodeAnalysis::runOnMachineFunction(MachineFunction &MF) {