@Nullable
private Collection<DfaMemoryState> createInitialStates(
@NotNull PsiElement psiBlock, @NotNull InstructionVisitor visitor) {
PsiElement container =
PsiTreeUtil.getParentOfType(psiBlock, PsiClass.class, PsiLambdaExpression.class);
if (container != null
&& (!(container instanceof PsiClass)
|| PsiUtil.isLocalOrAnonymousClass((PsiClass) container))) {
final PsiElement parent = container.getParent();
final PsiCodeBlock block = DfaPsiUtil.getTopmostBlockInSameClass(parent);
if (block != null) {
final RunnerResult result = analyzeMethod(block, visitor);
if (result == RunnerResult.OK) {
final Collection<DfaMemoryState> closureStates =
myNestedClosures.get(DfaPsiUtil.getTopmostBlockInSameClass(psiBlock));
if (!closureStates.isEmpty()) {
return closureStates;
}
}
return null;
}
}
return Collections.singletonList(createMemoryState());
}
@NotNull
final RunnerResult analyzeMethod(
@NotNull PsiElement psiBlock,
@NotNull InstructionVisitor visitor,
boolean ignoreAssertions,
@NotNull Collection<DfaMemoryState> initialStates) {
if (PsiTreeUtil.findChildOfType(psiBlock, OuterLanguageElement.class) != null)
return RunnerResult.NOT_APPLICABLE;
try {
final ControlFlow flow =
new ControlFlowAnalyzer(myValueFactory, psiBlock, ignoreAssertions).buildControlFlow();
if (flow == null) return RunnerResult.NOT_APPLICABLE;
int[] loopNumber = LoopAnalyzer.calcInLoop(flow);
int endOffset = flow.getInstructionCount();
myInstructions = flow.getInstructions();
myNestedClosures.clear();
Set<Instruction> joinInstructions = ContainerUtil.newHashSet();
for (int index = 0; index < myInstructions.length; index++) {
Instruction instruction = myInstructions[index];
if (instruction instanceof GotoInstruction) {
joinInstructions.add(myInstructions[((GotoInstruction) instruction).getOffset()]);
} else if (instruction instanceof ConditionalGotoInstruction) {
joinInstructions.add(
myInstructions[((ConditionalGotoInstruction) instruction).getOffset()]);
} else if (instruction instanceof MethodCallInstruction
&& !((MethodCallInstruction) instruction).getContracts().isEmpty()) {
joinInstructions.add(myInstructions[index + 1]);
}
}
if (LOG.isDebugEnabled()) {
LOG.debug("Analyzing code block: " + psiBlock.getText());
for (int i = 0; i < myInstructions.length; i++) {
LOG.debug(i + ": " + myInstructions[i]);
}
}
// for (int i = 0; i < myInstructions.length; i++) System.out.println(i + ": " +
// myInstructions[i].toString());
Integer tooExpensiveHash = psiBlock.getUserData(TOO_EXPENSIVE_HASH);
if (tooExpensiveHash != null && tooExpensiveHash == psiBlock.getText().hashCode()) {
LOG.debug("Too complex because hasn't changed since being too complex already");
return RunnerResult.TOO_COMPLEX;
}
final StateQueue queue = new StateQueue();
for (final DfaMemoryState initialState : initialStates) {
queue.offer(new DfaInstructionState(myInstructions[0], initialState));
}
MultiMap<BranchingInstruction, DfaMemoryState> processedStates = MultiMap.createSet();
MultiMap<BranchingInstruction, DfaMemoryState> incomingStates = MultiMap.createSet();
long msLimit =
shouldCheckTimeLimit()
? Registry.intValue("ide.dfa.time.limit.online")
: Registry.intValue("ide.dfa.time.limit.offline");
WorkingTimeMeasurer measurer = new WorkingTimeMeasurer(msLimit * 1000 * 1000);
int count = 0;
while (!queue.isEmpty()) {
List<DfaInstructionState> states = queue.getNextInstructionStates(joinInstructions);
for (DfaInstructionState instructionState : states) {
if (count++ % 1024 == 0 && measurer.isTimeOver()) {
LOG.debug("Too complex because the analysis took too long");
psiBlock.putUserData(TOO_EXPENSIVE_HASH, psiBlock.getText().hashCode());
return RunnerResult.TOO_COMPLEX;
}
ProgressManager.checkCanceled();
if (LOG.isDebugEnabled()) {
LOG.debug(instructionState.toString());
}
// System.out.println(instructionState.toString());
Instruction instruction = instructionState.getInstruction();
if (instruction instanceof BranchingInstruction) {
BranchingInstruction branching = (BranchingInstruction) instruction;
Collection<DfaMemoryState> processed = processedStates.get(branching);
if (processed.contains(instructionState.getMemoryState())) {
continue;
}
if (processed.size() > MAX_STATES_PER_BRANCH) {
LOG.debug("Too complex because too many different possible states");
return RunnerResult.TOO_COMPLEX; // Too complex :(
}
if (loopNumber[branching.getIndex()] != 0) {
processedStates.putValue(branching, instructionState.getMemoryState().createCopy());
}
}
DfaInstructionState[] after = acceptInstruction(visitor, instructionState);
for (DfaInstructionState state : after) {
Instruction nextInstruction = state.getInstruction();
if (nextInstruction.getIndex() >= endOffset) {
continue;
}
handleStepOutOfLoop(
instruction,
nextInstruction,
loopNumber,
processedStates,
incomingStates,
states,
after,
queue);
if (nextInstruction instanceof BranchingInstruction) {
BranchingInstruction branching = (BranchingInstruction) nextInstruction;
if (processedStates.get(branching).contains(state.getMemoryState())
|| incomingStates.get(branching).contains(state.getMemoryState())) {
continue;
}
if (loopNumber[branching.getIndex()] != 0) {
incomingStates.putValue(branching, state.getMemoryState().createCopy());
}
}
queue.offer(state);
}
}
}
psiBlock.putUserData(TOO_EXPENSIVE_HASH, null);
LOG.debug("Analysis ok");
return RunnerResult.OK;
} catch (ArrayIndexOutOfBoundsException e) {
LOG.error(psiBlock.getText(), e);
return RunnerResult.ABORTED;
} catch (EmptyStackException e) {
LOG.error(psiBlock.getText(), e);
return RunnerResult.ABORTED;
}
}