本文整理汇总了C++中machinebasicblock::const_iterator::getOpcode方法的典型用法代码示例。如果您正苦于以下问题：C++ const_iterator::getOpcode方法的具体用法？C++ const_iterator::getOpcode怎么用？C++ const_iterator::getOpcode使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类machinebasicblock::const_iterator的用法示例。
在下文中一共展示了const_iterator::getOpcode方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: isAsynchronousEHPersonality
DenseMap<const MachineBasicBlock *, int>
llvm::getEHScopeMembership(const MachineFunction &MF) {
DenseMap<const MachineBasicBlock *, int> EHScopeMembership;
// We don't have anything to do if there aren't any EH pads.
if (!MF.hasEHScopes())
return EHScopeMembership;
int EntryBBNumber = MF.front().getNumber();
bool IsSEH = isAsynchronousEHPersonality(
classifyEHPersonality(MF.getFunction().getPersonalityFn()));
const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
SmallVector<const MachineBasicBlock *, 16> EHScopeBlocks;
SmallVector<const MachineBasicBlock *, 16> UnreachableBlocks;
SmallVector<const MachineBasicBlock *, 16> SEHCatchPads;
SmallVector<std::pair<const MachineBasicBlock *, int>, 16> CatchRetSuccessors;
for (const MachineBasicBlock &MBB : MF) {
if (MBB.isEHScopeEntry()) {
EHScopeBlocks.push_back(&MBB);
} else if (IsSEH && MBB.isEHPad()) {
SEHCatchPads.push_back(&MBB);
} else if (MBB.pred_empty()) {
UnreachableBlocks.push_back(&MBB);
}
MachineBasicBlock::const_iterator MBBI = MBB.getFirstTerminator();
// CatchPads are not scopes for SEH so do not consider CatchRet to
// transfer control to another scope.
if (MBBI == MBB.end() || MBBI->getOpcode() != TII->getCatchReturnOpcode())
continue;
// FIXME: SEH CatchPads are not necessarily in the parent function:
// they could be inside a finally block.
const MachineBasicBlock *Successor = MBBI->getOperand(0).getMBB();
const MachineBasicBlock *SuccessorColor = MBBI->getOperand(1).getMBB();
CatchRetSuccessors.push_back(
{Successor, IsSEH ? EntryBBNumber : SuccessorColor->getNumber()});
}
// We don't have anything to do if there aren't any EH pads.
if (EHScopeBlocks.empty())
return EHScopeMembership;
// Identify all the basic blocks reachable from the function entry.
collectEHScopeMembers(EHScopeMembership, EntryBBNumber, &MF.front());
// All blocks not part of a scope are in the parent function.
for (const MachineBasicBlock *MBB : UnreachableBlocks)
collectEHScopeMembers(EHScopeMembership, EntryBBNumber, MBB);
// Next, identify all the blocks inside the scopes.
for (const MachineBasicBlock *MBB : EHScopeBlocks)
collectEHScopeMembers(EHScopeMembership, MBB->getNumber(), MBB);
// SEH CatchPads aren't really scopes, handle them separately.
for (const MachineBasicBlock *MBB : SEHCatchPads)
collectEHScopeMembers(EHScopeMembership, EntryBBNumber, MBB);
// Finally, identify all the targets of a catchret.
for (std::pair<const MachineBasicBlock *, int> CatchRetPair :
CatchRetSuccessors)
collectEHScopeMembers(EHScopeMembership, CatchRetPair.second,
CatchRetPair.first);
return EHScopeMembership;
}