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A landing pad could have more than one predecessor. In that case, we want that

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predecessor to remove the jump to it as well. Delay clearing the 'landing pad'
flag until after the jumps have been removed. (There is an implicit assumption
in several modules that an MBB which jumps to a landing pad has only two
successors.)
<rdar://problem/10304224>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142390 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-10-18 18:30:49 +00:00
parent 9120088979
commit f7b0207f1e
1 changed files with 8 additions and 1 deletions
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9
lib/Target/ARM/ARMISelLowering.cpp
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@ -5895,6 +5895,7 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const {
const ARMBaseInstrInfo *AII = static_cast<const ARMBaseInstrInfo*>(TII);
const ARMBaseRegisterInfo &RI = AII->getRegisterInfo();
const unsigned *SavedRegs = RI.getCalleeSavedRegs(MF);
SmallVector<MachineBasicBlock*, 64> MBBLPads;
for (SmallPtrSet<MachineBasicBlock*, 64>::iterator
I = InvokeBBs.begin(), E = InvokeBBs.end(); I != E; ++I) {
MachineBasicBlock *BB = *I;
@ -5906,7 +5907,7 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const {
MachineBasicBlock *SMBB = *SI;
if (SMBB->isLandingPad()) {
BB->removeSuccessor(SMBB);
SMBB->setIsLandingPad(false);
MBBLPads.push_back(SMBB);
}
}
@ -5940,6 +5941,12 @@ EmitSjLjDispatchBlock(MachineInstr *MI, MachineBasicBlock *MBB) const {
}
}
// Mark all former landing pads as non-landing pads. The dispatch is the only
// landing pad now.
for (SmallVectorImpl<MachineBasicBlock*>::iterator
I = MBBLPads.begin(), E = MBBLPads.end(); I != E; ++I)
(*I)->setIsLandingPad(false);
// The instruction is gone now.
MI->eraseFromParent();