public FlowInfo analyseAssignment(
BlockScope currentScope,
FlowContext flowContext,
FlowInfo flowInfo,
Assignment assignment,
boolean isCompound) {
boolean isReachable = (flowInfo.tagBits & FlowInfo.UNREACHABLE) == 0;
// compound assignment extra work
if (isCompound) { // check the variable part is initialized if blank final
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.FIELD: // reading a field
FieldBinding fieldBinding = (FieldBinding) this.binding;
if (fieldBinding.isBlankFinal()
&& currentScope.needBlankFinalFieldInitializationCheck(fieldBinding)) {
FlowInfo fieldInits =
flowContext.getInitsForFinalBlankInitializationCheck(
fieldBinding.declaringClass.original(), flowInfo);
if (!fieldInits.isDefinitelyAssigned(fieldBinding)) {
currentScope.problemReporter().uninitializedBlankFinalField(fieldBinding, this);
}
}
if (!fieldBinding.isStatic()) {
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=318682
currentScope.resetEnclosingMethodStaticFlag();
}
manageSyntheticAccessIfNecessary(currentScope, flowInfo, true /*read-access*/);
break;
case Binding.LOCAL: // reading a local variable
// check if assigning a final blank field
LocalVariableBinding localBinding;
if (!flowInfo.isDefinitelyAssigned(localBinding = (LocalVariableBinding) this.binding)) {
currentScope.problemReporter().uninitializedLocalVariable(localBinding, this);
// we could improve error msg here telling "cannot use compound assignment on final
// local variable"
}
if (localBinding.useFlag != LocalVariableBinding.USED) {
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=185682
// access from compound assignment does not prevent "unused" warning, unless unboxing is
// involved:
if (isReachable && (this.implicitConversion & TypeIds.UNBOXING) != 0) {
localBinding.useFlag = LocalVariableBinding.USED;
} else {
// use values < 0 to count the number of compound uses:
if (localBinding.useFlag <= LocalVariableBinding.UNUSED) localBinding.useFlag--;
}
}
}
}
if (assignment.expression != null) {
flowInfo =
assignment
.expression
.analyseCode(currentScope, flowContext, flowInfo)
.unconditionalInits();
}
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.FIELD: // assigning to a field
manageSyntheticAccessIfNecessary(currentScope, flowInfo, false /*write-access*/);
// check if assigning a final field
FieldBinding fieldBinding = (FieldBinding) this.binding;
if (fieldBinding.isFinal()) {
// inside a context where allowed
if (!isCompound
&& fieldBinding.isBlankFinal()
&& currentScope.allowBlankFinalFieldAssignment(fieldBinding)) {
if (flowInfo.isPotentiallyAssigned(fieldBinding)) {
currentScope
.problemReporter()
.duplicateInitializationOfBlankFinalField(fieldBinding, this);
} else {
flowContext.recordSettingFinal(fieldBinding, this, flowInfo);
}
flowInfo.markAsDefinitelyAssigned(fieldBinding);
} else {
currentScope.problemReporter().cannotAssignToFinalField(fieldBinding, this);
}
}
if (!fieldBinding.isStatic()) {
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=318682
currentScope.resetEnclosingMethodStaticFlag();
}
break;
case Binding.LOCAL: // assigning to a local variable
LocalVariableBinding localBinding = (LocalVariableBinding) this.binding;
if (!flowInfo.isDefinitelyAssigned(localBinding)) { // for local variable debug attributes
this.bits |= ASTNode.FirstAssignmentToLocal;
} else {
this.bits &= ~ASTNode.FirstAssignmentToLocal;
}
if (localBinding.isFinal()) {
if ((this.bits & ASTNode.DepthMASK) == 0) {
// tolerate assignment to final local in unreachable code (45674)
if ((isReachable && isCompound) || !localBinding.isBlankFinal()) {
currentScope.problemReporter().cannotAssignToFinalLocal(localBinding, this);
} else if (flowInfo.isPotentiallyAssigned(localBinding)) {
currentScope
.problemReporter()
.duplicateInitializationOfFinalLocal(localBinding, this);
} else {
flowContext.recordSettingFinal(localBinding, this, flowInfo);
}
} else {
currentScope.problemReporter().cannotAssignToFinalOuterLocal(localBinding, this);
}
} else /* avoid double diagnostic */ if ((localBinding.tagBits & TagBits.IsArgument) != 0) {
currentScope.problemReporter().parameterAssignment(localBinding, this);
}
flowInfo.markAsDefinitelyAssigned(localBinding);
}
manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo);
return flowInfo;
}
