public void generatePostIncrement(
BlockScope currentScope, CompoundAssignment postIncrement, boolean valueRequired) {
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.FIELD: // assigning to a field
FieldBinding fieldBinding = (FieldBinding) this.binding;
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=185682
// check if postIncrement is the only usage of a private field
reportOnlyUselesslyReadPrivateField(currentScope, fieldBinding, valueRequired);
FieldBinding codegenField = fieldBinding.original();
fieldStore(
currentScope,
codegenField,
this.syntheticAccessors == null
? null
: this.syntheticAccessors[SingleNameReference.WRITE],
this.actualReceiverType,
true /*implicit this*/,
false);
// no need for generic cast
return;
case Binding.LOCAL: // assigning to a local variable
LocalVariableBinding localBinding = (LocalVariableBinding) this.binding;
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=185682
// check if postIncrement is the only usage of this local
Reference.reportOnlyUselesslyReadLocal(currentScope, localBinding, valueRequired);
if (localBinding.resolvedPosition == -1) {
if (valueRequired) {
// restart code gen
localBinding.useFlag = LocalVariableBinding.USED;
throw new AbortMethod(null, null);
}
}
}
}
public void generateCode(BlockScope currentScope, boolean valueRequired) {
if (this.constant != Constant.NotAConstant) {
return;
} else {
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.FIELD: // reading a field
FieldBinding codegenField = ((FieldBinding) this.binding).original();
Constant fieldConstant = codegenField.constant();
if (fieldConstant != Constant.NotAConstant) {
return;
}
if (codegenField.isStatic()) {
if (!valueRequired
// if no valueRequired, still need possible side-effects of <clinit> invocation,
// if field belongs to different class
&& ((FieldBinding) this.binding).original().declaringClass
== this.actualReceiverType.erasure()
&& ((this.implicitConversion & TypeIds.UNBOXING) == 0)
&& this.genericCast == null) {
// if no valueRequired, optimize out entire gen
return;
}
} else {
if (!valueRequired
&& (this.implicitConversion & TypeIds.UNBOXING) == 0
&& this.genericCast == null) {
// if no valueRequired, optimize out entire gen
return;
}
}
break;
case Binding.LOCAL: // reading a local
LocalVariableBinding localBinding = (LocalVariableBinding) this.binding;
if (localBinding.resolvedPosition == -1) {
if (valueRequired) {
// restart code gen
localBinding.useFlag = LocalVariableBinding.USED;
throw new AbortMethod(null, null);
}
return;
}
if (!valueRequired && (this.implicitConversion & TypeIds.UNBOXING) == 0) {
// if no valueRequired, optimize out entire gen
return;
}
break;
default: // type
return;
}
}
}
public FlowInfo analyseCode(
BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo, boolean valueRequired) {
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.FIELD: // reading a field
if (valueRequired
|| currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4) {
manageSyntheticAccessIfNecessary(currentScope, flowInfo, true /*read-access*/);
}
// check if reading a final blank 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();
}
break;
case Binding.LOCAL: // reading a local variable
LocalVariableBinding localBinding;
if (!flowInfo.isDefinitelyAssigned(localBinding = (LocalVariableBinding) this.binding)) {
currentScope.problemReporter().uninitializedLocalVariable(localBinding, this);
}
if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) == 0) {
localBinding.useFlag = LocalVariableBinding.USED;
} else if (localBinding.useFlag == LocalVariableBinding.UNUSED) {
localBinding.useFlag = LocalVariableBinding.FAKE_USED;
}
}
if (valueRequired) {
manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo);
}
return flowInfo;
}
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;
}
/*
* The APIs with an extra argument is used whenever there are two references to the same variable which
* are optimized in one access: e.g "a = a + 1" optimized into "a++".
*/
public void generateCompoundAssignment(
BlockScope currentScope,
MethodBinding writeAccessor,
Expression expression,
int operator,
int assignmentImplicitConversion,
boolean valueRequired) {
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.FIELD: // assigning to a field
break;
case Binding.LOCAL: // assigning to a local variable (cannot assign to outer local)
LocalVariableBinding localBinding = (LocalVariableBinding) this.binding;
// using incr bytecode if possible
Constant assignConstant;
switch (localBinding.type.id) {
case T_JavaLangString:
return;
case T_int:
assignConstant = expression.constant;
if (localBinding.resolvedPosition == -1) {
if (valueRequired) {
/*
* restart code gen because we either:
* - need the value
* - the constant can have potential side-effect
*/
localBinding.useFlag = LocalVariableBinding.USED;
throw new AbortMethod(null, null);
} else if (assignConstant == Constant.NotAConstant) {
// we only need to generate the value of the expression's constant if it is not a
// constant expression
expression.generateCode(currentScope, false);
}
return;
}
if ((assignConstant != Constant.NotAConstant)
&& (assignConstant.typeID() != TypeIds.T_float)
// only for integral types
&& (assignConstant.typeID()
!= TypeIds.T_double)) { // TODO (philippe) is this test needed ?
switch (operator) {
case PLUS:
int increment = assignConstant.intValue();
if (increment != (short) increment) break; // not representable as a 16-bits value
return;
case MINUS:
increment = -assignConstant.intValue();
if (increment != (short) increment) break; // not representable as a 16-bits value
return;
}
}
// $FALL-THROUGH$
default:
if (localBinding.resolvedPosition == -1) {
assignConstant = expression.constant;
if (valueRequired) {
/*
* restart code gen because we either:
* - need the value
* - the constant can have potential side-effect
*/
localBinding.useFlag = LocalVariableBinding.USED;
throw new AbortMethod(null, null);
} else if (assignConstant == Constant.NotAConstant) {
// we only need to generate the value of the expression's constant if it is not a
// constant expression
expression.generateCode(currentScope, false);
}
return;
}
}
}
switch ((this.implicitConversion & TypeIds.IMPLICIT_CONVERSION_MASK) >> 4) {
case T_JavaLangString:
case T_JavaLangObject:
case T_undefined:
// we enter here if the single name reference is a field of type java.lang.String or if the
// type of the
// operation is java.lang.Object
// For example: o = o + ""; // where the compiled type of o is java.lang.Object.
// no need for generic cast on previous #getfield since using Object string buffer methods.
break;
default:
// promote the array reference to the suitable operation type
// generate the increment value (will by itself be promoted to the operation value)
if (expression != IntLiteral.One) { // prefix operation
expression.generateCode(currentScope, true);
}
}
// store the result back into the variable
switch (this.bits & ASTNode.RestrictiveFlagMASK) {
case Binding.FIELD: // assigning to a field
FieldBinding codegenField = ((FieldBinding) this.binding).original();
fieldStore(
currentScope,
codegenField,
writeAccessor,
this.actualReceiverType,
true /* implicit this*/,
valueRequired);
// no need for generic cast as value got dupped
return;
case Binding.LOCAL: // assigning to a local variable
LocalVariableBinding localBinding = (LocalVariableBinding) this.binding;
if (valueRequired) {
switch (localBinding.type.id) {
case TypeIds.T_long:
case TypeIds.T_double:
break;
default:
break;
}
}
}
}