/**
* Record that a nullity mismatch was detected against an annotated type reference.
*
* @param currentScope scope for error reporting
* @param expression the expression violating the specification
* @param providedType the type of the provided value, i.e., either expression or an element
* thereof (in ForeachStatements)
* @param expectedType the declared type of the spec'ed variable, for error reporting.
* @param flowInfo the flowInfo observed when visiting expression
* @param nullStatus the null status of expression at the current location
* @param annotationStatus status from type annotation analysis, or null
*/
public void recordNullityMismatch(
BlockScope currentScope,
Expression expression,
TypeBinding providedType,
TypeBinding expectedType,
FlowInfo flowInfo,
int nullStatus,
NullAnnotationMatching annotationStatus) {
if (providedType == null) {
return; // assume type error was already reported
}
if (expression.localVariableBinding()
!= null) { // flowContext cannot yet handle non-localvar expressions (e.g., fields)
// find the inner-most flowContext that might need deferred handling:
FlowContext currentContext = this;
while (currentContext != null) {
// some flow contexts implement deferred checking, should we participate in that?
int isInsideAssert = 0x0;
if ((this.tagBits & FlowContext.HIDE_NULL_COMPARISON_WARNING) != 0) {
isInsideAssert = FlowContext.HIDE_NULL_COMPARISON_WARNING;
}
if (currentContext.internalRecordNullityMismatch(
expression,
providedType,
flowInfo,
nullStatus,
expectedType,
ASSIGN_TO_NONNULL | isInsideAssert)) return;
currentContext = currentContext.parent;
}
}
// no reason to defer, so report now:
if (annotationStatus != null)
currentScope
.problemReporter()
.nullityMismatchingTypeAnnotation(
expression, providedType, expectedType, annotationStatus);
else
currentScope
.problemReporter()
.nullityMismatch(
expression,
providedType,
expectedType,
nullStatus,
currentScope.environment().getNonNullAnnotationName());
}
/**
* @param isExceptionOnAutoClose This is for checking exception handlers for exceptions raised
* during the auto close of resources inside a try with resources statement. (Relevant for
* source levels 1.7 and above only)
*/
public void checkExceptionHandlers(
TypeBinding raisedException,
ASTNode location,
FlowInfo flowInfo,
BlockScope scope,
boolean isExceptionOnAutoClose) {
// LIGHT-VERSION OF THE EQUIVALENT WITH AN ARRAY OF EXCEPTIONS
// check that all the argument exception types are handled
// JDK Compatible implementation - when an exception type is thrown,
// all related catch blocks are marked as reachable... instead of those only
// until the point where it is safely handled (Smarter - see comment at the end)
FlowContext traversedContext = this;
ArrayList abruptlyExitedLoops = null;
if (scope.compilerOptions().sourceLevel >= ClassFileConstants.JDK1_7
&& location instanceof ThrowStatement) {
Expression throwExpression = ((ThrowStatement) location).exception;
LocalVariableBinding throwArgBinding = throwExpression.localVariableBinding();
if (throwExpression
instanceof SingleNameReference // https://bugs.eclipse.org/bugs/show_bug.cgi?id=350361
&& throwArgBinding instanceof CatchParameterBinding
&& throwArgBinding.isEffectivelyFinal()) {
CatchParameterBinding parameter = (CatchParameterBinding) throwArgBinding;
checkExceptionHandlers(parameter.getPreciseTypes(), location, flowInfo, scope);
return;
}
}
while (traversedContext != null) {
SubRoutineStatement sub;
if (((sub = traversedContext.subroutine()) != null) && sub.isSubRoutineEscaping()) {
// traversing a non-returning subroutine means that all unhandled
// exceptions will actually never get sent...
return;
}
// filter exceptions that are locally caught from the innermost enclosing
// try statement to the outermost ones.
if (traversedContext instanceof ExceptionHandlingFlowContext) {
ExceptionHandlingFlowContext exceptionContext =
(ExceptionHandlingFlowContext) traversedContext;
ReferenceBinding[] caughtExceptions;
if ((caughtExceptions = exceptionContext.handledExceptions) != Binding.NO_EXCEPTIONS) {
boolean definitelyCaught = false;
for (int caughtIndex = 0, caughtCount = caughtExceptions.length;
caughtIndex < caughtCount;
caughtIndex++) {
ReferenceBinding caughtException = caughtExceptions[caughtIndex];
FlowInfo exceptionFlow = flowInfo;
int state =
caughtException == null
? Scope.EQUAL_OR_MORE_SPECIFIC /* any exception */
: Scope.compareTypes(raisedException, caughtException);
if (abruptlyExitedLoops != null
&& caughtException != null
&& state != Scope.NOT_RELATED) {
for (int i = 0, abruptlyExitedLoopsCount = abruptlyExitedLoops.size();
i < abruptlyExitedLoopsCount;
i++) {
LoopingFlowContext loop = (LoopingFlowContext) abruptlyExitedLoops.get(i);
loop.recordCatchContextOfEscapingException(
exceptionContext, caughtException, flowInfo);
}
exceptionFlow =
FlowInfo
.DEAD_END; // don't use flow info on first round, flow info will be evaluated
// during loopback simulation
}
switch (state) {
case Scope.EQUAL_OR_MORE_SPECIFIC:
exceptionContext.recordHandlingException(
caughtException,
exceptionFlow.unconditionalInits(),
raisedException,
raisedException, // precise exception that will be caught
location,
definitelyCaught);
// was it already definitely caught ?
definitelyCaught = true;
break;
case Scope.MORE_GENERIC:
exceptionContext.recordHandlingException(
caughtException,
exceptionFlow.unconditionalInits(),
raisedException,
caughtException,
location,
false);
// was not caught already per construction
}
}
if (definitelyCaught) return;
}
// method treatment for unchecked exceptions
if (exceptionContext.isMethodContext) {
if (raisedException.isUncheckedException(false)) return;
boolean shouldMergeUnhandledExceptions =
exceptionContext instanceof ExceptionInferenceFlowContext;
// anonymous constructors are allowed to throw any exceptions (their thrown exceptions
// clause will be fixed up later as per JLS 8.6).
if (exceptionContext.associatedNode instanceof AbstractMethodDeclaration) {
AbstractMethodDeclaration method =
(AbstractMethodDeclaration) exceptionContext.associatedNode;
if (method.isConstructor() && method.binding.declaringClass.isAnonymousType())
shouldMergeUnhandledExceptions = true;
}
if (shouldMergeUnhandledExceptions) {
exceptionContext.mergeUnhandledException(raisedException);
return; // no need to complain, will fix up constructor/lambda exceptions
}
break; // not handled anywhere, thus jump to error handling
}
} else if (traversedContext instanceof LoopingFlowContext) {
if (abruptlyExitedLoops == null) {
abruptlyExitedLoops = new ArrayList(5);
}
abruptlyExitedLoops.add(traversedContext);
}
traversedContext.recordReturnFrom(flowInfo.unconditionalInits());
if (!isExceptionOnAutoClose) {
if (traversedContext instanceof InsideSubRoutineFlowContext) {
ASTNode node = traversedContext.associatedNode;
if (node instanceof TryStatement) {
TryStatement tryStatement = (TryStatement) node;
flowInfo.addInitializationsFrom(tryStatement.subRoutineInits); // collect inits
}
}
}
traversedContext = traversedContext.getLocalParent();
}
// if reaches this point, then there are some remaining unhandled exception types.
if (isExceptionOnAutoClose) {
scope.problemReporter().unhandledExceptionFromAutoClose(raisedException, location);
} else {
scope.problemReporter().unhandledException(raisedException, location);
}
}
