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/*******************************************************************************
* Copyright (c) 2000, 2013 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Stephan Herrmann - Contribution for
* bug 345305 - [compiler][null] Compiler misidentifies a case of "variable can only be null"
* bug 383368 - [compiler][null] syntactic null analysis for field references
* bug 402993 - [null] Follow up of bug 401088: Missing warning about redundant null check
* Jesper S Moller - Contributions for
* bug 382721 - [1.8][compiler] Effectively final variables needs special treatment
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.flow.*;
import org.eclipse.jdt.internal.compiler.impl.Constant;
import org.eclipse.jdt.internal.compiler.lookup.*;
public class CompoundAssignment extends Assignment implements OperatorIds {
public int operator;
public int preAssignImplicitConversion;
// var op exp is equivalent to var = (varType) var op exp
// assignmentImplicitConversion stores the cast needed for the assignment
public CompoundAssignment(Expression lhs, Expression expression,int operator, int sourceEnd) {
//lhs is always a reference by construction ,
//but is build as an expression ==> the checkcast cannot fail
super(lhs, expression, sourceEnd);
lhs.bits &= ~IsStrictlyAssigned; // tag lhs as NON assigned - it is also a read access
lhs.bits |= IsCompoundAssigned; // tag lhs as assigned by compound
this.operator = operator ;
}
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext,
FlowInfo flowInfo) {
// record setting a variable: various scenarii are possible, setting an array reference,
// a field reference, a blank final field reference, a field of an enclosing instance or
// just a local variable.
if (this.resolvedType.id != T_JavaLangString) {
this.lhs.checkNPE(currentScope, flowContext, flowInfo);
// account for exceptions thrown by any arithmetics:
flowContext.recordAbruptExit();
}
flowInfo = ((Reference) this.lhs).analyseAssignment(currentScope, flowContext, flowInfo, this, true).unconditionalInits();
if (this.resolvedType.id == T_JavaLangString) {
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=339250
LocalVariableBinding local = this.lhs.localVariableBinding();
if (local != null) {
// compound assignment results in a definitely non null value for String
flowInfo.markAsDefinitelyNonNull(local);
flowContext.markFinallyNullStatus(local, FlowInfo.NON_NULL);
}
}
return flowInfo;
}
public boolean checkCastCompatibility() {
return true;
}
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
// various scenarii are possible, setting an array reference,
// a field reference, a blank final field reference, a field of an enclosing instance or
// just a local variable.
int pc = codeStream.position;
((Reference) this.lhs).generateCompoundAssignment(currentScope, codeStream, this.expression, this.operator, this.preAssignImplicitConversion, valueRequired);
if (valueRequired) {
codeStream.generateImplicitConversion(this.implicitConversion);
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
public int nullStatus(FlowInfo flowInfo, FlowContext flowContext) {
return FlowInfo.NON_NULL;
// we may have complained on checkNPE, but we avoid duplicate error
}
public String operatorToString() {
switch (this.operator) {
case PLUS :
return "+="; //$NON-NLS-1$
case MINUS :
return "-="; //$NON-NLS-1$
case MULTIPLY :
return "*="; //$NON-NLS-1$
case DIVIDE :
return "/="; //$NON-NLS-1$
case AND :
return "&="; //$NON-NLS-1$
case OR :
return "|="; //$NON-NLS-1$
case XOR :
return "^="; //$NON-NLS-1$
case REMAINDER :
return "%="; //$NON-NLS-1$
case LEFT_SHIFT :
return "<<="; //$NON-NLS-1$
case RIGHT_SHIFT :
return ">>="; //$NON-NLS-1$
case UNSIGNED_RIGHT_SHIFT :
return ">>>="; //$NON-NLS-1$
}
return "unknown operator"; //$NON-NLS-1$
}
public StringBuffer printExpressionNoParenthesis(int indent, StringBuffer output) {
this.lhs.printExpression(indent, output).append(' ').append(operatorToString()).append(' ');
return this.expression.printExpression(0, output) ;
}
public TypeBinding resolveType(BlockScope scope) {
this.constant = Constant.NotAConstant;
if (!(this.lhs instanceof Reference) || this.lhs.isThis()) {
scope.problemReporter().expressionShouldBeAVariable(this.lhs);
return null;
}
boolean expressionIsCast = this.expression instanceof CastExpression;
if (expressionIsCast)
this.expression.bits |= ASTNode.DisableUnnecessaryCastCheck; // will check later on
TypeBinding originalLhsType = this.lhs.resolveType(scope);
TypeBinding originalExpressionType = this.expression.resolveType(scope);
if (originalLhsType == null || originalExpressionType == null)
return null;
// autoboxing support
LookupEnvironment env = scope.environment();
TypeBinding lhsType = originalLhsType, expressionType = originalExpressionType;
boolean use15specifics = scope.compilerOptions().sourceLevel >= ClassFileConstants.JDK1_5;
boolean unboxedLhs = false;
if (use15specifics) {
if (!lhsType.isBaseType() && expressionType.id != T_JavaLangString && expressionType.id != T_null) {
TypeBinding unboxedType = env.computeBoxingType(lhsType);
if (TypeBinding.notEquals(unboxedType, lhsType)) {
lhsType = unboxedType;
unboxedLhs = true;
}
}
if (!expressionType.isBaseType() && lhsType.id != T_JavaLangString && lhsType.id != T_null) {
expressionType = env.computeBoxingType(expressionType);
}
}
if (restrainUsageToNumericTypes() && !lhsType.isNumericType()) {
scope.problemReporter().operatorOnlyValidOnNumericType(this, lhsType, expressionType);
return null;
}
int lhsID = lhsType.id;
int expressionID = expressionType.id;
if (lhsID > 15 || expressionID > 15) {
if (lhsID != T_JavaLangString) { // String += Thread is valid whereas Thread += String is not
scope.problemReporter().invalidOperator(this, lhsType, expressionType);
return null;
}
expressionID = T_JavaLangObject; // use the Object has tag table
}
// the code is an int
// (cast) left Op (cast) rigth --> result
// 0000 0000 0000 0000 0000
// <<16 <<12 <<8 <<4 <<0
// the conversion is stored INTO the reference (info needed for the code gen)
int result = OperatorExpression.OperatorSignatures[this.operator][ (lhsID << 4) + expressionID];
if (result == T_undefined) {
scope.problemReporter().invalidOperator(this, lhsType, expressionType);
return null;
}
if (this.operator == PLUS){
if(lhsID == T_JavaLangObject && (scope.compilerOptions().complianceLevel < ClassFileConstants.JDK1_7)) {
//
