public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
this.preAssertInitStateIndex = currentScope.methodScope().recordInitializationStates(flowInfo);
Constant cst = this.assertExpression.optimizedBooleanConstant();
if ((this.assertExpression.implicitConversion & TypeIds.UNBOXING) != 0) {
this.assertExpression.checkNPE(currentScope, flowContext, flowInfo);
}
boolean isOptimizedTrueAssertion = cst != Constant.NotAConstant && cst.booleanValue() == true;
boolean isOptimizedFalseAssertion = cst != Constant.NotAConstant && cst.booleanValue() == false;
flowContext.tagBits |= FlowContext.HIDE_NULL_COMPARISON_WARNING;
FlowInfo conditionFlowInfo =
this.assertExpression.analyseCode(currentScope, flowContext, flowInfo.copy());
flowContext.extendTimeToLiveForNullCheckedField(1); // survive this assert as a Statement
flowContext.tagBits &= ~FlowContext.HIDE_NULL_COMPARISON_WARNING;
UnconditionalFlowInfo assertWhenTrueInfo =
conditionFlowInfo.initsWhenTrue().unconditionalInits();
FlowInfo assertInfo = conditionFlowInfo.initsWhenFalse();
if (isOptimizedTrueAssertion) {
assertInfo.setReachMode(FlowInfo.UNREACHABLE_OR_DEAD);
}
if (this.exceptionArgument != null) {
// only gets evaluated when escaping - results are not taken into account
FlowInfo exceptionInfo =
this.exceptionArgument.analyseCode(currentScope, flowContext, assertInfo.copy());
if (isOptimizedTrueAssertion) {
currentScope.problemReporter().fakeReachable(this.exceptionArgument);
} else {
flowContext.checkExceptionHandlers(
currentScope.getJavaLangAssertionError(), this, exceptionInfo, currentScope);
}
}
if (!isOptimizedTrueAssertion) {
// add the assert support in the clinit
manageSyntheticAccessIfNecessary(currentScope, flowInfo);
}
// account for potential AssertionError:
flowContext.recordAbruptExit();
if (isOptimizedFalseAssertion) {
return flowInfo; // if assertions are enabled, the following code will be unreachable
// change this if we need to carry null analysis results of the assert
// expression downstream
} else {
CompilerOptions compilerOptions = currentScope.compilerOptions();
if (!compilerOptions.includeNullInfoFromAsserts) {
// keep just the initializations info, don't include assert's null info
// merge initialization info's and then add back the null info from flowInfo to
// make sure that the empty null info of assertInfo doesnt change flowInfo's null info.
return ((flowInfo.nullInfoLessUnconditionalCopy())
.mergedWith(assertInfo.nullInfoLessUnconditionalCopy()))
.addNullInfoFrom(flowInfo);
}
return flowInfo
.mergedWith(assertInfo.nullInfoLessUnconditionalCopy())
.addInitializationsFrom(assertWhenTrueInfo.discardInitializationInfo());
// keep the merge from the initial code for the definite assignment
// analysis, tweak the null part to influence nulls downstream
}
}
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
this.breakLabel = new BranchLabel();
this.continueLabel = new BranchLabel();
LoopingFlowContext loopingContext =
new LoopingFlowContext(
flowContext, flowInfo, this, this.breakLabel, this.continueLabel, currentScope);
Constant cst = this.condition.constant;
boolean isConditionTrue = cst != Constant.NotAConstant && cst.booleanValue() == true;
cst = this.condition.optimizedBooleanConstant();
boolean isConditionOptimizedTrue = cst != Constant.NotAConstant && cst.booleanValue() == true;
boolean isConditionOptimizedFalse = cst != Constant.NotAConstant && cst.booleanValue() == false;
int previousMode = flowInfo.reachMode();
UnconditionalFlowInfo actionInfo = flowInfo.nullInfoLessUnconditionalCopy();
// we need to collect the contribution to nulls of the coming paths through the
// loop, be they falling through normally or branched to break, continue labels
// or catch blocks
if ((this.action != null) && !this.action.isEmptyBlock()) {
actionInfo =
this.action.analyseCode(currentScope, loopingContext, actionInfo).unconditionalInits();
// code generation can be optimized when no need to continue in the loop
if ((actionInfo.tagBits & loopingContext.initsOnContinue.tagBits & FlowInfo.UNREACHABLE)
!= 0) {
this.continueLabel = null;
}
}
/* Reset reach mode, to address following scenario.
* final blank;
* do { if (true) break; else blank = 0; } while(false);
* blank = 1; // may be initialized already
*/
actionInfo.setReachMode(previousMode);
LoopingFlowContext condLoopContext;
FlowInfo condInfo =
this.condition.analyseCode(
currentScope,
(condLoopContext =
new LoopingFlowContext(flowContext, flowInfo, this, null, null, currentScope)),
(this.action == null
? actionInfo
: (actionInfo.mergedWith(loopingContext.initsOnContinue)))
.copy());
this.preConditionInitStateIndex =
currentScope.methodScope().recordInitializationStates(actionInfo);
if (!isConditionOptimizedFalse && this.continueLabel != null) {
loopingContext.complainOnDeferredFinalChecks(currentScope, condInfo);
condLoopContext.complainOnDeferredFinalChecks(currentScope, condInfo);
loopingContext.complainOnDeferredNullChecks(
currentScope,
flowInfo
.unconditionalCopy()
.addPotentialNullInfoFrom(condInfo.initsWhenTrue().unconditionalInits()));
condLoopContext.complainOnDeferredNullChecks(
currentScope,
actionInfo.addPotentialNullInfoFrom(condInfo.initsWhenTrue().unconditionalInits()));
}
// end of loop
FlowInfo mergedInfo =
FlowInfo.mergedOptimizedBranches(
(loopingContext.initsOnBreak.tagBits & FlowInfo.UNREACHABLE) != 0
? loopingContext.initsOnBreak
: flowInfo.unconditionalCopy().addInitializationsFrom(loopingContext.initsOnBreak),
// recover upstream null info
isConditionOptimizedTrue,
(condInfo.tagBits & FlowInfo.UNREACHABLE) == 0
? flowInfo.addInitializationsFrom(condInfo.initsWhenFalse())
: condInfo,
// recover null inits from before condition analysis
false, // never consider opt false case for DO loop, since break can always occur
// (47776)
!isConditionTrue /*do{}while(true); unreachable(); */);
this.mergedInitStateIndex = currentScope.methodScope().recordInitializationStates(mergedInfo);
return mergedInfo;
}
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
boolean nonStatic = !this.binding.isStatic();
boolean wasInsideAssert =
((flowContext.tagBits & FlowContext.HIDE_NULL_COMPARISON_WARNING) != 0);
flowInfo =
this.receiver
.analyseCode(currentScope, flowContext, flowInfo, nonStatic)
.unconditionalInits();
// recording the closing of AutoCloseable resources:
boolean analyseResources = currentScope.compilerOptions().analyseResourceLeaks;
if (analyseResources && CharOperation.equals(TypeConstants.CLOSE, this.selector)) {
FakedTrackingVariable trackingVariable =
FakedTrackingVariable.getCloseTrackingVariable(this.receiver);
if (trackingVariable
!= null) { // null happens if receiver is not a local variable or not an AutoCloseable
if (trackingVariable.methodScope == currentScope.methodScope()) {
trackingVariable.markClose(flowInfo, flowContext);
} else {
trackingVariable.markClosedInNestedMethod();
}
}
}
if (nonStatic) {
this.receiver.checkNPE(currentScope, flowContext, flowInfo);
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=318682
if (this.receiver.isThis()) {
// accessing non-static method without an object
currentScope.resetDeclaringClassMethodStaticFlag(this.binding.declaringClass);
}
} else if (this.receiver.isThis()) {
if ((this.receiver.bits & ASTNode.IsImplicitThis) == 0) {
// explicit this receiver, not allowed in static context
currentScope.resetEnclosingMethodStaticFlag();
}
}
FlowInfo conditionFlowInfo;
if (this.arguments != null) {
int length = this.arguments.length;
for (int i = 0; i < length; i++) {
Expression argument = this.arguments[i];
if ((argument.implicitConversion & TypeIds.UNBOXING) != 0) {
argument.checkNPE(currentScope, flowContext, flowInfo);
}
if (this.receiver.resolvedType != null
&& this.receiver.resolvedType.id == TypeIds.T_OrgEclipseCoreRuntimeAssert
&& argument.resolvedType != null
&& argument.resolvedType.id == TypeIds.T_boolean) {
Constant cst = argument.optimizedBooleanConstant();
boolean isOptimizedTrueAssertion =
cst != Constant.NotAConstant && cst.booleanValue() == true;
boolean isOptimizedFalseAssertion =
cst != Constant.NotAConstant && cst.booleanValue() == false;
flowContext.tagBits |= FlowContext.HIDE_NULL_COMPARISON_WARNING;
conditionFlowInfo = argument.analyseCode(currentScope, flowContext, flowInfo.copy());
if (!wasInsideAssert) {
flowContext.tagBits &= ~FlowContext.HIDE_NULL_COMPARISON_WARNING;
}
UnconditionalFlowInfo assertWhenTrueInfo =
conditionFlowInfo.initsWhenTrue().unconditionalInits();
FlowInfo assertInfo = conditionFlowInfo.initsWhenFalse();
if (isOptimizedTrueAssertion) {
assertInfo.setReachMode(FlowInfo.UNREACHABLE_OR_DEAD);
}
if (!isOptimizedFalseAssertion) {
// if assertion is not false for sure, only then it makes sense to carry the flow info
// ahead.
// if the code does reach ahead, it means the assert didn't cause an exit, and so
// the expression inside it shouldn't change the prior flowinfo
// viz. org.eclipse.core.runtime.Assert.isLegal(false && o != null)
// keep the merge from the initial code for the definite assignment
// analysis, tweak the null part to influence nulls downstream
flowInfo =
flowInfo
.mergedWith(assertInfo.nullInfoLessUnconditionalCopy())
.addInitializationsFrom(assertWhenTrueInfo.discardInitializationInfo());
}
} else {
flowInfo = argument.analyseCode(currentScope, flowContext, flowInfo).unconditionalInits();
}
if (analyseResources) {
// if argument is an AutoCloseable insert info that it *may* be closed (by the target
// method, i.e.)
flowInfo =
FakedTrackingVariable.markPassedToOutside(currentScope, argument, flowInfo, false);
}
}
analyseArguments(currentScope, flowContext, flowInfo, this.binding, this.arguments);
}
ReferenceBinding[] thrownExceptions;
if ((thrownExceptions = this.binding.thrownExceptions) != Binding.NO_EXCEPTIONS) {
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);
}
// must verify that exceptions potentially thrown by this expression are caught in the method
flowContext.checkExceptionHandlers(thrownExceptions, this, flowInfo.copy(), currentScope);
// TODO (maxime) the copy above is needed because of a side effect into
// checkExceptionHandlers; consider protecting there instead of here;
// NullReferenceTest#test0510
}
manageSyntheticAccessIfNecessary(currentScope, flowInfo);
return flowInfo;
}