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;
public CompoundAssignment(Expression lhs, Expression expression,int operator, int sourceEnd) {
super(lhs, expression, sourceEnd);
lhs.bits &= ~IsStrictlyAssigned;
lhs.bits |= IsCompoundAssigned;
this.operator = operator ;
}
@Override
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext,
FlowInfo flowInfo) {
if (this.resolvedType.id != T_JavaLangString) {
this.lhs.checkNPE(currentScope, flowContext, flowInfo);
flowContext.recordAbruptExit();
}
this.expression.checkNPEbyUnboxing(currentScope, flowContext, flowInfo);
flowInfo = ((Reference) this.lhs).analyseAssignment(currentScope, flowContext, flowInfo, this, true).unconditionalInits();
if (this.resolvedType.id == T_JavaLangString) {
LocalVariableBinding local = this.lhs.localVariableBinding();
if (local != null) {
flowInfo.markAsDefinitelyNonNull(local);
flowContext.markFinallyNullStatus(local, FlowInfo.NON_NULL);
}
}
return flowInfo;
}
public boolean checkCastCompatibility() {
return true;
}
@Override
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
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);
}
@Override
public int nullStatus(FlowInfo flowInfo, FlowContext flowContext) {
return FlowInfo.NON_NULL;
}
public String operatorToString() {
switch (this.operator) {
case PLUS :
return "+=";
case MINUS :
return "-=";
case MULTIPLY :
return "*=";
case DIVIDE :
return "/=";
case AND :
return "&=";
case OR :
return "|=";
case XOR :
return "^=";
case REMAINDER :
return "%=";
case LEFT_SHIFT :
return "<<=";
case RIGHT_SHIFT :
return ">>=";
case UNSIGNED_RIGHT_SHIFT :
return ">>>=";
}
return "unknown operator";
}
@Override
public StringBuffer printExpressionNoParenthesis(int indent, StringBuffer output) {
this.lhs.printExpression(indent, output).append(' ').append(operatorToString()).append(' ');
return this.expression.printExpression(0, output) ;
}
@Override
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;
TypeBinding originalLhsType = this.lhs.resolveType(scope);
TypeBinding originalExpressionType = this.expression.resolveType(scope);
if (originalLhsType == null || originalExpressionType == null)
return null;
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) {
scope.problemReporter().invalidOperator(this, lhsType, expressionType);
return null;
}
expressionID = T_JavaLangObject;
}
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)) {
scope.problemReporter().invalidOperator(this, lhsType, expressionType);
return null;
} else {
if ((lhsType.isNumericType() || lhsID == T_boolean) && !expressionType.isNumericType()){
scope.problemReporter().invalidOperator(this, lhsType, expressionType);
return null;
}
}
}
TypeBinding resultType = TypeBinding.wellKnownType(scope, result & 0x0000F);
if (checkCastCompatibility()) {
if (originalLhsType.id != T_JavaLangString && resultType.id != T_JavaLangString) {
if (!checkCastTypesCompatibility(scope, originalLhsType, resultType, null)) {
scope.problemReporter().invalidOperator(this, originalLhsType, expressionType);
return null;
}
}
}
this.lhs.computeConversion(scope, TypeBinding.wellKnownType(scope, (result >>> 16) & 0x0000F), originalLhsType);
this.expression.computeConversion(scope, TypeBinding.wellKnownType(scope, (result >>> 8) & 0x0000F), originalExpressionType);
this.preAssignImplicitConversion = (unboxedLhs ? BOXING : 0) | (lhsID << 4) | (result & 0x0000F);
if (unboxedLhs) scope.problemReporter().autoboxing(this, lhsType, originalLhsType);
if (expressionIsCast)
CastExpression.checkNeedForArgumentCasts(scope, this.operator, result, this.lhs, originalLhsType.id, false, this.expression, originalExpressionType.id, true);
return this.resolvedType = originalLhsType;
}
public boolean restrainUsageToNumericTypes(){
return false ;
}
@Override
public void traverse(ASTVisitor visitor, BlockScope scope) {
if (visitor.visit(this, scope)) {
this.lhs.traverse(visitor, scope);
this.expression.traverse(visitor, scope);
}
visitor.endVisit(this, scope);
}
}
CompoundAssignment
