+++ /dev/null
-/*******************************************************************************
- * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Common Public License v0.5
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/cpl-v05.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- ******************************************************************************/
-package net.sourceforge.phpdt.internal.compiler.ast;
-
-import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
-import net.sourceforge.phpdt.internal.compiler.codegen.CodeStream;
-import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
-import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
-import net.sourceforge.phpdt.internal.compiler.lookup.BaseTypeBinding;
-import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
-import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
-
-public class Assignment extends Expression {
-
- public Reference lhs;
- public Expression expression;
- public TypeBinding lhsType;
-
- public Assignment(Expression lhs, Expression expression, int sourceEnd) {
- //lhs is always a reference by construction ,
- //but is build as an expression ==> the checkcast cannot fail
-
- this.lhs = (Reference) lhs;
- this.expression = expression;
-
- this.sourceStart = lhs.sourceStart;
- this.sourceEnd = sourceEnd;
- }
-
- 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.
-
- return lhs
- .analyseAssignment(currentScope, flowContext, flowInfo, this, false)
- .unconditionalInits();
- }
-
- 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;
- lhs.generateAssignment(currentScope, codeStream, this, valueRequired);
- // variable may have been optimized out
- // the lhs is responsible to perform the implicitConversion generation for the assignment since optimized for unused local assignment.
- codeStream.recordPositionsFrom(pc, this.sourceStart);
- }
-
- public TypeBinding resolveType(BlockScope scope) {
-
- // due to syntax lhs may be only a NameReference, a FieldReference or an ArrayReference
- constant = NotAConstant;
- this.lhsType = lhs.resolveType(scope);
- TypeBinding expressionTb = expression.resolveType(scope);
- if (this.lhsType == null || expressionTb == null)
- return null;
-
- // Compile-time conversion of base-types : implicit narrowing integer into byte/short/character
- // may require to widen the rhs expression at runtime
- if ((expression.isConstantValueOfTypeAssignableToType(expressionTb, this.lhsType)
- || (this.lhsType.isBaseType() && BaseTypeBinding.isWidening(this.lhsType.id, expressionTb.id)))
- || (BlockScope.areTypesCompatible(expressionTb, this.lhsType))) {
- expression.implicitWidening(this.lhsType, expressionTb);
- return this.lhsType;
- }
- scope.problemReporter().typeMismatchErrorActualTypeExpectedType(
- expression,
- expressionTb,
- this.lhsType);
- return null;
- }
-
- public String toString(int tab) {
-
- //no () when used as a statement
- return tabString(tab) + toStringExpressionNoParenthesis();
- }
-
- public String toStringExpression() {
-
- //subclass redefine toStringExpressionNoParenthesis()
- return "(" + toStringExpressionNoParenthesis() + ")"; //$NON-NLS-2$ //$NON-NLS-1$
- }
-
- public String toStringExpressionNoParenthesis() {
-
- return lhs.toStringExpression() + " " //$NON-NLS-1$
- + "=" //$NON-NLS-1$
- + ((expression.constant != null) && (expression.constant != NotAConstant)
- ? " /*cst:" + expression.constant.toString() + "*/ " //$NON-NLS-1$ //$NON-NLS-2$
- : " ") //$NON-NLS-1$
- + expression.toStringExpression();
- }
- public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
-
- if (visitor.visit(this, scope)) {
- lhs.traverse(visitor, scope);
- expression.traverse(visitor, scope);
- }
- visitor.endVisit(this, scope);
- }
-}
\ No newline at end of file
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