/// in the machine code. It inserts labels at safe points and populates a
/// GCMetadata record for each function.
class GCMachineCodeAnalysis : public MachineFunctionPass {
- const TargetMachine *TM;
GCFunctionInfo *FI;
MachineModuleInfo *MMI;
const TargetInstrInfo *TII;
MCSymbol *GCMachineCodeAnalysis::InsertLabel(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
DebugLoc DL) const {
- MCSymbol *Label = MBB.getParent()->getContext().CreateTempSymbol();
+ MCSymbol *Label = MBB.getParent()->getContext().createTempSymbol();
BuildMI(MBB, MI, DL, TII->get(TargetOpcode::GC_LABEL)).addSym(Label);
return Label;
}
}
void GCMachineCodeAnalysis::FindStackOffsets(MachineFunction &MF) {
- const TargetFrameLowering *TFI = TM->getSubtargetImpl()->getFrameLowering();
+ const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
assert(TFI && "TargetRegisterInfo not available!");
for (GCFunctionInfo::roots_iterator RI = FI->roots_begin();
return false;
FI = &getAnalysis<GCModuleInfo>().getFunctionInfo(*MF.getFunction());
- if (!FI->getStrategy().needsSafePoints())
- return false;
-
- TM = &MF.getTarget();
MMI = &getAnalysis<MachineModuleInfo>();
- TII = TM->getSubtargetImpl()->getInstrInfo();
+ TII = MF.getSubtarget().getInstrInfo();
- // Find the size of the stack frame.
- FI->setFrameSize(MF.getFrameInfo()->getStackSize());
+ // Find the size of the stack frame. There may be no correct static frame
+ // size, we use UINT64_MAX to represent this.
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ const TargetRegisterInfo *RegInfo = MF.getSubtarget().getRegisterInfo();
+ const bool DynamicFrameSize = MFI->hasVarSizedObjects() ||
+ RegInfo->needsStackRealignment(MF);
+ FI->setFrameSize(DynamicFrameSize ? UINT64_MAX : MFI->getStackSize());
// Find all safe points.
- FindSafePoints(MF);
+ if (FI->getStrategy().needsSafePoints())
+ FindSafePoints(MF);
- // Find the stack offsets for all roots.
+ // Find the concrete stack offsets for all roots (stack slots)
FindStackOffsets(MF);
return false;