public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
// check captured variables are initialized in current context (26134)
checkCapturedLocalInitializationIfNecessary(
(ReferenceBinding) this.binding.declaringClass.erasure(), currentScope, flowInfo);
// process arguments
if (this.arguments != null) {
boolean analyseResources = currentScope.compilerOptions().analyseResourceLeaks;
boolean hasResourceWrapperType =
analyseResources
&& this.resolvedType instanceof ReferenceBinding
&& ((ReferenceBinding) this.resolvedType).hasTypeBit(TypeIds.BitWrapperCloseable);
for (int i = 0, count = this.arguments.length; i < count; i++) {
flowInfo =
this.arguments[i].analyseCode(currentScope, flowContext, flowInfo).unconditionalInits();
// if argument is an AutoCloseable insert info that it *may* be closed (by the target
// method, i.e.)
if (analyseResources
&& !hasResourceWrapperType) { // allocation of wrapped closeables is analyzed specially
flowInfo =
FakedTrackingVariable.markPassedToOutside(
currentScope, this.arguments[i], flowInfo, flowContext, false);
}
this.arguments[i].checkNPEbyUnboxing(currentScope, flowContext, flowInfo);
}
analyseArguments(currentScope, flowContext, flowInfo, this.binding, this.arguments);
}
// record some dependency information for exception types
ReferenceBinding[] thrownExceptions;
if (((thrownExceptions = this.binding.thrownExceptions).length) != 0) {
if ((this.bits & ASTNode.Unchecked) != 0 && this.genericTypeArguments == null) {
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=277643, align with javac on JLS 15.12.2.6
thrownExceptions =
currentScope.environment().convertToRawTypes(this.binding.thrownExceptions, true, true);
}
// check exception handling
flowContext.checkExceptionHandlers(
thrownExceptions, this, flowInfo.unconditionalCopy(), currentScope);
}
// after having analysed exceptions above start tracking newly allocated resource:
if (currentScope.compilerOptions().analyseResourceLeaks
&& FakedTrackingVariable.isAnyCloseable(this.resolvedType))
FakedTrackingVariable.analyseCloseableAllocation(currentScope, flowInfo, this);
if (this.binding.declaringClass.isMemberType() && !this.binding.declaringClass.isStatic()) {
// allocating a non-static member type without an enclosing instance of parent type
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=335845
currentScope.resetDeclaringClassMethodStaticFlag(this.binding.declaringClass.enclosingType());
// Reviewed for https://bugs.eclipse.org/bugs/show_bug.cgi?id=378674 :
// The corresponding problem (when called from static) is not produced until during code
// generation
}
manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo);
manageSyntheticAccessIfNecessary(currentScope, flowInfo);
// account for possible exceptions thrown by the constructor
flowContext.recordAbruptExit(); // TODO whitelist of ctors that cannot throw any exc.??
return flowInfo;
}
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
// Consider the try block and catch block so as to compute the intersection of initializations
// and
// the minimum exit relative depth amongst all of them. Then consider the subroutine, and append
// its
// initialization to the try/catch ones, if the subroutine completes normally. If the subroutine
// does not
// complete, then only keep this result for the rest of the analysis
// process the finally block (subroutine) - create a context for the subroutine
this.preTryInitStateIndex = currentScope.methodScope().recordInitializationStates(flowInfo);
if (this.anyExceptionVariable != null) {
this.anyExceptionVariable.useFlag = LocalVariableBinding.USED;
}
if (this.returnAddressVariable != null) { // TODO (philippe) if subroutine is escaping, unused
this.returnAddressVariable.useFlag = LocalVariableBinding.USED;
}
if (this.subRoutineStartLabel == null) {
// no finally block -- this is a simplified copy of the else part
// process the try block in a context handling the local exceptions.
ExceptionHandlingFlowContext handlingContext =
new ExceptionHandlingFlowContext(
flowContext,
this,
this.caughtExceptionTypes,
null,
this.scope,
flowInfo.unconditionalInits());
handlingContext.initsOnFinally = new NullInfoRegistry(flowInfo.unconditionalInits());
// only try blocks initialize that member - may consider creating a
// separate class if needed
FlowInfo tryInfo;
if (this.tryBlock.isEmptyBlock()) {
tryInfo = flowInfo;
} else {
tryInfo = this.tryBlock.analyseCode(currentScope, handlingContext, flowInfo.copy());
if ((tryInfo.tagBits & FlowInfo.UNREACHABLE) != 0) this.bits |= ASTNode.IsTryBlockExiting;
}
// check unreachable catch blocks
handlingContext.complainIfUnusedExceptionHandlers(this.scope, this);
// process the catch blocks - computing the minimal exit depth amongst try/catch
if (this.catchArguments != null) {
int catchCount;
this.catchExits = new boolean[catchCount = this.catchBlocks.length];
this.catchExitInitStateIndexes = new int[catchCount];
for (int i = 0; i < catchCount; i++) {
// keep track of the inits that could potentially have led to this exception handler (for
// final assignments diagnosis)
FlowInfo catchInfo;
if (this.caughtExceptionTypes[i].isUncheckedException(true)) {
catchInfo =
handlingContext.initsOnFinally.mitigateNullInfoOf(
flowInfo
.unconditionalCopy()
.addPotentialInitializationsFrom(
handlingContext.initsOnException(this.caughtExceptionTypes[i]))
.addPotentialInitializationsFrom(tryInfo)
.addPotentialInitializationsFrom(handlingContext.initsOnReturn));
} else {
FlowInfo initsOnException =
handlingContext.initsOnException(this.caughtExceptionTypes[i]);
catchInfo =
flowInfo
.nullInfoLessUnconditionalCopy()
.addPotentialInitializationsFrom(initsOnException)
.addNullInfoFrom(
initsOnException) // null info only from here, this is the only way to enter
// the catch block
.addPotentialInitializationsFrom(tryInfo.nullInfoLessUnconditionalCopy())
.addPotentialInitializationsFrom(
handlingContext.initsOnReturn.nullInfoLessUnconditionalCopy());
}
// catch var is always set
LocalVariableBinding catchArg = this.catchArguments[i].binding;
catchInfo.markAsDefinitelyAssigned(catchArg);
catchInfo.markAsDefinitelyNonNull(catchArg);
/*
"If we are about to consider an unchecked exception handler, potential inits may have occured inside
the try block that need to be detected , e.g.
try { x = 1; throwSomething();} catch(Exception e){ x = 2} "
"(uncheckedExceptionTypes notNil and: [uncheckedExceptionTypes at: index])
ifTrue: [catchInits addPotentialInitializationsFrom: tryInits]."
*/
if (this.tryBlock.statements == null) {
catchInfo.setReachMode(FlowInfo.UNREACHABLE);
}
catchInfo = this.catchBlocks[i].analyseCode(currentScope, flowContext, catchInfo);
this.catchExitInitStateIndexes[i] =
currentScope.methodScope().recordInitializationStates(catchInfo);
this.catchExits[i] = (catchInfo.tagBits & FlowInfo.UNREACHABLE) != 0;
tryInfo = tryInfo.mergedWith(catchInfo.unconditionalInits());
}
}
this.mergedInitStateIndex = currentScope.methodScope().recordInitializationStates(tryInfo);
// chain up null info registry
if (flowContext.initsOnFinally != null) {
flowContext.initsOnFinally.add(handlingContext.initsOnFinally);
}
return tryInfo;
} else {
InsideSubRoutineFlowContext insideSubContext;
FinallyFlowContext finallyContext;
UnconditionalFlowInfo subInfo;
// analyse finally block first
insideSubContext = new InsideSubRoutineFlowContext(flowContext, this);
subInfo =
this.finallyBlock
.analyseCode(
currentScope,
finallyContext = new FinallyFlowContext(flowContext, this.finallyBlock),
flowInfo.nullInfoLessUnconditionalCopy())
.unconditionalInits();
if (subInfo == FlowInfo.DEAD_END) {
this.bits |= ASTNode.IsSubRoutineEscaping;
this.scope.problemReporter().finallyMustCompleteNormally(this.finallyBlock);
}
this.subRoutineInits = subInfo;
// process the try block in a context handling the local exceptions.
ExceptionHandlingFlowContext handlingContext =
new ExceptionHandlingFlowContext(
insideSubContext,
this,
this.caughtExceptionTypes,
null,
this.scope,
flowInfo.unconditionalInits());
handlingContext.initsOnFinally = new NullInfoRegistry(flowInfo.unconditionalInits());
// only try blocks initialize that member - may consider creating a
// separate class if needed
FlowInfo tryInfo;
if (this.tryBlock.isEmptyBlock()) {
tryInfo = flowInfo;
} else {
tryInfo = this.tryBlock.analyseCode(currentScope, handlingContext, flowInfo.copy());
if ((tryInfo.tagBits & FlowInfo.UNREACHABLE) != 0) this.bits |= ASTNode.IsTryBlockExiting;
}
// check unreachable catch blocks
handlingContext.complainIfUnusedExceptionHandlers(this.scope, this);
// process the catch blocks - computing the minimal exit depth amongst try/catch
if (this.catchArguments != null) {
int catchCount;
this.catchExits = new boolean[catchCount = this.catchBlocks.length];
this.catchExitInitStateIndexes = new int[catchCount];
for (int i = 0; i < catchCount; i++) {
// keep track of the inits that could potentially have led to this exception handler (for
// final assignments diagnosis)
FlowInfo catchInfo;
if (this.caughtExceptionTypes[i].isUncheckedException(true)) {
catchInfo =
handlingContext.initsOnFinally.mitigateNullInfoOf(
flowInfo
.unconditionalCopy()
.addPotentialInitializationsFrom(
handlingContext.initsOnException(this.caughtExceptionTypes[i]))
.addPotentialInitializationsFrom(tryInfo)
.addPotentialInitializationsFrom(handlingContext.initsOnReturn));
} else {
FlowInfo initsOnException =
handlingContext.initsOnException(this.caughtExceptionTypes[i]);
catchInfo =
flowInfo
.nullInfoLessUnconditionalCopy()
.addPotentialInitializationsFrom(initsOnException)
.addNullInfoFrom(
initsOnException) // null info only from here, this is the only way to enter
// the catch block
.addPotentialInitializationsFrom(tryInfo.nullInfoLessUnconditionalCopy())
.addPotentialInitializationsFrom(
handlingContext.initsOnReturn.nullInfoLessUnconditionalCopy());
}
// catch var is always set
LocalVariableBinding catchArg = this.catchArguments[i].binding;
catchInfo.markAsDefinitelyAssigned(catchArg);
catchInfo.markAsDefinitelyNonNull(catchArg);
/*
"If we are about to consider an unchecked exception handler, potential inits may have occured inside
the try block that need to be detected , e.g.
try { x = 1; throwSomething();} catch(Exception e){ x = 2} "
"(uncheckedExceptionTypes notNil and: [uncheckedExceptionTypes at: index])
ifTrue: [catchInits addPotentialInitializationsFrom: tryInits]."
*/
if (this.tryBlock.statements == null) {
catchInfo.setReachMode(FlowInfo.UNREACHABLE);
}
catchInfo = this.catchBlocks[i].analyseCode(currentScope, insideSubContext, catchInfo);
this.catchExitInitStateIndexes[i] =
currentScope.methodScope().recordInitializationStates(catchInfo);
this.catchExits[i] = (catchInfo.tagBits & FlowInfo.UNREACHABLE) != 0;
tryInfo = tryInfo.mergedWith(catchInfo.unconditionalInits());
}
}
// we also need to check potential multiple assignments of final variables inside the finally
// block
// need to include potential inits from returns inside the try/catch parts - 1GK2AOF
finallyContext.complainOnDeferredChecks(
handlingContext.initsOnFinally.mitigateNullInfoOf(
(tryInfo.tagBits & FlowInfo.UNREACHABLE) == 0
? flowInfo
.unconditionalCopy()
.addPotentialInitializationsFrom(tryInfo)
.
// lighten the influence of the try block, which may have
// exited at any point
addPotentialInitializationsFrom(insideSubContext.initsOnReturn)
: insideSubContext.initsOnReturn),
currentScope);
// chain up null info registry
if (flowContext.initsOnFinally != null) {
flowContext.initsOnFinally.add(handlingContext.initsOnFinally);
}
this.naturalExitMergeInitStateIndex =
currentScope.methodScope().recordInitializationStates(tryInfo);
if (subInfo == FlowInfo.DEAD_END) {
this.mergedInitStateIndex = currentScope.methodScope().recordInitializationStates(subInfo);
return subInfo;
} else {
FlowInfo mergedInfo = tryInfo.addInitializationsFrom(subInfo);
this.mergedInitStateIndex =
currentScope.methodScope().recordInitializationStates(mergedInfo);
return mergedInfo;
}
}
}
