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SILOptimzer: correct a case of UB #62508

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Dec 12, 2022
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SILOptimzer: correct a case of UB #62508

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16 changes: 8 additions & 8 deletions include/swift/SILOptimizer/Utils/UpdatingInstructionIterator.h
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Original file line number Diff line number Diff line change
Expand Up @@ -177,24 +177,24 @@ class UpdatingInstructionIteratorRegistry {


public:
UpdatingInstructionIteratorRegistry() :
callbacks(InstModCallbacks()
UpdatingInstructionIteratorRegistry() {
callbacks = std::move(InstModCallbacks()
.onDelete([this](SILInstruction *toDelete) {
notifyDelete(toDelete);
toDelete->eraseFromParent();
})
.onCreateNewInst(
[this](SILInstruction *newlyCreatedInst) {
notifyNew(newlyCreatedInst);
}))
{}
}));
}

UpdatingInstructionIteratorRegistry(InstModCallbacks &&chainedCallbacks) :
// Copy the two std::functions that we need. The rest of the callbacks are
// copied implicitly by assignment.
chainedDelete(std::move(chainedCallbacks.deleteInstFunc)),
chainedNew(std::move(chainedCallbacks.createdNewInstFunc)),
callbacks(std::move(chainedCallbacks
chainedNew(std::move(chainedCallbacks.createdNewInstFunc)) {
callbacks = std::move(chainedCallbacks
.onDelete([this](SILInstruction *toDelete) {
notifyDelete(toDelete);
if (chainedDelete) {
Expand All @@ -209,8 +209,8 @@ class UpdatingInstructionIteratorRegistry {
if (chainedNew) {
chainedNew(newlyCreatedInst);
}
})))
{}
}));
}

// The callbacks capture 'this'. So copying is invalid.
UpdatingInstructionIteratorRegistry(
Expand Down