/*
* 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;
}
}
}
}