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[WinEH] Push unique_ptr through the Action interface.

Browse Source 
This was the source of many leaks in the past, this should fix them once and
for all.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237524 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2015-05-16 15:40:03 +00:00
parent a0b851cb9c
commit 11ba91f321
3 changed files with 33 additions and 40 deletions
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3
include/llvm/CodeGen/WinEHFuncInfo.h
View File

@ -107,8 +107,7 @@ public:
};
void parseEHActions(const IntrinsicInst *II,
SmallVectorImpl<ActionHandler *> &Actions);
SmallVectorImpl<std::unique_ptr<ActionHandler>> &Actions);
// The following structs respresent the .xdata for functions using C++
// exceptions on Windows.

36
lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
View File

@ -89,7 +89,7 @@ struct WinEHNumbering {
int CurrentBaseState;
int NextState;
SmallVector<ActionHandler *, 4> HandlerStack;
SmallVector<std::unique_ptr<ActionHandler>, 4> HandlerStack;
SmallPtrSet<const Function *, 4> VisitedHandlers;
int currentEHNumber() const {
@ -99,7 +99,8 @@ struct WinEHNumbering {
void createUnwindMapEntry(int ToState, ActionHandler *AH);
void createTryBlockMapEntry(int TryLow, int TryHigh,
ArrayRef<CatchHandler *> Handlers);
void processCallSite(ArrayRef<ActionHandler *> Actions, ImmutableCallSite CS);
void processCallSite(MutableArrayRef<std::unique_ptr<ActionHandler>> Actions,
ImmutableCallSite CS);
void calculateStateNumbers(const Function &F);
};
}
@ -324,13 +325,13 @@ void FunctionLoweringInfo::addSEHHandlersForLPads(
// Parse the llvm.eh.actions call we found.
MachineBasicBlock *LPadMBB = MBBMap[LP->getParent()];
SmallVector<ActionHandler *, 4> Actions;
SmallVector<std::unique_ptr<ActionHandler>, 4> Actions;
parseEHActions(ActionsCall, Actions);
// Iterate EH actions from most to least precedence, which means
// iterating in reverse.
for (auto I = Actions.rbegin(), E = Actions.rend(); I != E; ++I) {
ActionHandler *Action = *I;
ActionHandler *Action = I->get();
if (auto *CH = dyn_cast<CatchHandler>(Action)) {
const auto *Filter =
dyn_cast<Function>(CH->getSelector()->stripPointerCasts());
@ -345,7 +346,6 @@ void FunctionLoweringInfo::addSEHHandlersForLPads(
MMI.addSEHCleanupHandler(LPadMBB, Fini);
}
}
DeleteContainerPointers(Actions);
}
}
@ -401,8 +401,9 @@ static void print_name(const Value *V) {
#endif
}
void WinEHNumbering::processCallSite(ArrayRef<ActionHandler *> Actions,
ImmutableCallSite CS) {
void WinEHNumbering::processCallSite(
MutableArrayRef<std::unique_ptr<ActionHandler>> Actions,
ImmutableCallSite CS) {
DEBUG(dbgs() << "processCallSite (EH state = " << currentEHNumber()
<< ") for: ");
print_name(CS ? CS.getCalledValue() : nullptr);
@ -426,21 +427,15 @@ void WinEHNumbering::processCallSite(ArrayRef<ActionHandler *> Actions,
if (HandlerStack[FirstMismatch]->getHandlerBlockOrFunc() !=
Actions[FirstMismatch]->getHandlerBlockOrFunc())
break;
// Delete any actions that are already represented on the handler stack.
delete Actions[FirstMismatch];
}
// Don't recurse while we are looping over the handler stack. Instead, defer
// the numbering of the catch handlers until we are done popping.
SmallVector<CatchHandler *, 4> PoppedCatches;
for (int I = HandlerStack.size() - 1; I >= FirstMismatch; --I) {
if (auto *CH = dyn_cast<CatchHandler>(HandlerStack.back())) {
PoppedCatches.push_back(CH);
} else {
// Delete cleanup handlers
delete HandlerStack.back();
}
HandlerStack.pop_back();
std::unique_ptr<ActionHandler> Handler = HandlerStack.pop_back_val();
if (isa<CatchHandler>(Handler.get()))
PoppedCatches.push_back(cast<CatchHandler>(Handler.release()));
}
int TryHigh = NextState - 1;
@ -487,7 +482,6 @@ void WinEHNumbering::processCallSite(ArrayRef<ActionHandler *> Actions,
if (HandlerStack[FirstMismatch]->getHandlerBlockOrFunc() !=
Actions[FirstMismatch]->getHandlerBlockOrFunc())
break;
delete Actions[FirstMismatch];
}
}
@ -498,7 +492,7 @@ void WinEHNumbering::processCallSite(ArrayRef<ActionHandler *> Actions,
bool LastActionWasCatch = false;
for (size_t I = FirstMismatch; I != Actions.size(); ++I) {
// We can reuse eh states when pushing two catches for the same invoke.
bool CurrActionIsCatch = isa<CatchHandler>(Actions[I]);
bool CurrActionIsCatch = isa<CatchHandler>(Actions[I].get());
// FIXME: Reenable this optimization!
if (CurrActionIsCatch && LastActionWasCatch && false) {
DEBUG(dbgs() << "setEHState for handler to " << currentEHNumber()
@ -508,12 +502,12 @@ void WinEHNumbering::processCallSite(ArrayRef<ActionHandler *> Actions,
DEBUG(dbgs() << "createUnwindMapEntry(" << currentEHNumber() << ", ");
print_name(Actions[I]->getHandlerBlockOrFunc());
DEBUG(dbgs() << ")\n");
createUnwindMapEntry(currentEHNumber(), Actions[I]);
createUnwindMapEntry(currentEHNumber(), Actions[I].get());
DEBUG(dbgs() << "setEHState for handler to " << NextState << "\n");
Actions[I]->setEHState(NextState);
NextState++;
}
HandlerStack.push_back(Actions[I]);
HandlerStack.push_back(std::move(Actions[I]));
LastActionWasCatch = CurrActionIsCatch;
}
@ -533,7 +527,7 @@ void WinEHNumbering::calculateStateNumbers(const Function &F) {
}
DEBUG(dbgs() << "Calculating state numbers for: " << F.getName() << '\n');
SmallVector<ActionHandler *, 4> ActionList;
SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
for (const BasicBlock &BB : F) {
for (const Instruction &I : BB) {
const auto *CI = dyn_cast<CallInst>(&I);

34
lib/CodeGen/WinEHPrepare.cpp
View File

@ -867,22 +867,21 @@ bool WinEHPrepare::prepareExceptionHandlers(
// Populate the indirectbr instructions' target lists if we deferred
// doing so above.
SetVector<BasicBlock*> CheckedTargets;
SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
for (auto &LPadImplPair : LPadImpls) {
IntrinsicInst *Recover = cast<IntrinsicInst>(LPadImplPair.first);
IndirectBrInst *Branch = LPadImplPair.second;
// Get a list of handlers called by
SmallVector<ActionHandler *, 4> ActionList;
parseEHActions(Recover, ActionList);
// Add an indirect branch listing possible successors of the catch handlers.
SetVector<BasicBlock *> ReturnTargets;
for (ActionHandler *Action : ActionList) {
if (auto *CA = dyn_cast<CatchHandler>(Action)) {
for (const auto &Action : ActionList) {
if (auto *CA = dyn_cast<CatchHandler>(Action.get())) {
Function *Handler = cast<Function>(CA->getHandlerBlockOrFunc());
getPossibleReturnTargets(&F, Handler, ReturnTargets);
}
delete Action;
}
ActionList.clear();
for (BasicBlock *Target : ReturnTargets) {
@ -1045,10 +1044,10 @@ void WinEHPrepare::getPossibleReturnTargets(Function *ParentF,
// parent function.
if (auto *LPI = BB.getLandingPadInst()) {
IntrinsicInst *Recover = cast<IntrinsicInst>(LPI->getNextNode());
SmallVector<ActionHandler *, 4> ActionList;
SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
parseEHActions(Recover, ActionList);
for (auto *Action : ActionList) {
if (auto *CH = dyn_cast<CatchHandler>(Action)) {
for (const auto &Action : ActionList) {
if (auto *CH = dyn_cast<CatchHandler>(Action.get())) {
Function *NestedF = cast<Function>(CH->getHandlerBlockOrFunc());
getPossibleReturnTargets(ParentF, NestedF, Targets);
}
@ -1101,10 +1100,10 @@ void WinEHPrepare::completeNestedLandingPad(Function *ParentFn,
// Remap the exception variables into the outlined function.
SmallVector<BlockAddress *, 4> ActionTargets;
SmallVector<ActionHandler *, 4> ActionList;
SmallVector<std::unique_ptr<ActionHandler>, 4> ActionList;
parseEHActions(EHActions, ActionList);
for (auto *Action : ActionList) {
auto *Catch = dyn_cast<CatchHandler>(Action);
for (const auto &Action : ActionList) {
auto *Catch = dyn_cast<CatchHandler>(Action.get());
if (!Catch)
continue;
// The dyn_cast to function here selects C++ catch handlers and skips
@ -1142,7 +1141,6 @@ void WinEHPrepare::completeNestedLandingPad(Function *ParentFn,
ActionTargets.push_back(NewBA);
}
}
DeleteContainerPointers(ActionList);
ActionList.clear();
OutlinedBB->getInstList().push_back(EHActions);
@ -2322,8 +2320,9 @@ void WinEHPrepare::findCleanupHandlers(LandingPadActions &Actions,
// This is a public function, declared in WinEHFuncInfo.h and is also
// referenced by WinEHNumbering in FunctionLoweringInfo.cpp.
void llvm::parseEHActions(const IntrinsicInst *II,
SmallVectorImpl<ActionHandler *> &Actions) {
void llvm::parseEHActions(
const IntrinsicInst *II,
SmallVectorImpl<std::unique_ptr<ActionHandler>> &Actions) {
for (unsigned I = 0, E = II->getNumArgOperands(); I != E;) {
uint64_t ActionKind =
cast<ConstantInt>(II->getArgOperand(I))->getZExtValue();
@ -2333,16 +2332,17 @@ void llvm::parseEHActions(const IntrinsicInst *II,
int64_t EHObjIndexVal = EHObjIndex->getSExtValue();
Constant *Handler = cast<Constant>(II->getArgOperand(I + 3));
I += 4;
auto *CH = new CatchHandler(/*BB=*/nullptr, Selector, /*NextBB=*/nullptr);
auto CH = make_unique<CatchHandler>(/*BB=*/nullptr, Selector,
/*NextBB=*/nullptr);
CH->setHandlerBlockOrFunc(Handler);
CH->setExceptionVarIndex(EHObjIndexVal);
Actions.push_back(CH);
Actions.push_back(std::move(CH));
} else if (ActionKind == 0) {
Constant *Handler = cast<Constant>(II->getArgOperand(I + 1));
I += 2;
auto *CH = new CleanupHandler(/*BB=*/nullptr);
auto CH = make_unique<CleanupHandler>(/*BB=*/nullptr);
CH->setHandlerBlockOrFunc(Handler);
Actions.push_back(CH);
Actions.push_back(std::move(CH));
} else {
llvm_unreachable("Expected either a catch or cleanup handler!");
}