+++ /dev/null
-/*******************************************************************************
- * Copyright (c) 2000, 2003 IBM Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Common Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/cpl-v10.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- * Genady Beriozkin - added support for reporting assignment with no effect
- *******************************************************************************/
-package net.sourceforge.phpeclipse.internal.compiler.ast;
-
-import net.sourceforge.phpdt.internal.compiler.ASTVisitor;
-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.Binding;
-import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
-import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
-
-public class Assignment extends Expression {
-
- public Expression lhs;
- public Expression expression;
-
- 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 = lhs;
- lhs.bits |= IsStrictlyAssignedMASK; // tag lhs as assigned
-
- 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 ((Reference) lhs)
- .analyseAssignment(currentScope, flowContext, flowInfo, this, false)
- .unconditionalInits();
- }
-
- void checkAssignmentEffect(BlockScope scope) {
-
- Binding left = getDirectBinding(this.lhs);
- if (left != null && left == getDirectBinding(this.expression)) {
- scope.problemReporter().assignmentHasNoEffect(this, left.shortReadableName());
- this.bits |= IsAssignmentWithNoEffectMASK; // record assignment has no effect
- }
- }
-
-// 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;
-// if ((this.bits & IsAssignmentWithNoEffectMASK) != 0) {
-// if (valueRequired) {
-// this.expression.generateCode(currentScope, codeStream, true);
-// }
-// } else {
-// ((Reference) 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);
-// }
-
- Binding getDirectBinding(Expression someExpression) {
- if (someExpression instanceof SingleNameReference) {
- return ((SingleNameReference)someExpression).binding;
- } else if (someExpression instanceof FieldReference) {
- FieldReference fieldRef = (FieldReference)someExpression;
- if (fieldRef.receiver.isThis() && !(fieldRef.receiver instanceof QualifiedThisReference)) {
- return fieldRef.binding;
- }
- }
- return null;
- }
- public StringBuffer print(int indent, StringBuffer output) {
-
- //no () when used as a statement
- printIndent(indent, output);
- return printExpressionNoParenthesis(indent, output);
- }
- public StringBuffer printExpression(int indent, StringBuffer output) {
-
- //subclass redefine printExpressionNoParenthesis()
- output.append('(');
- return printExpressionNoParenthesis(0, output).append(')');
- }
-
- public StringBuffer printExpressionNoParenthesis(int indent, StringBuffer output) {
-
- lhs.printExpression(indent, output).append(" = "); //$NON-NLS-1$
- return expression.printExpression(0, output);
- }
-
- public StringBuffer printStatement(int indent, StringBuffer output) {
-
- //no () when used as a statement
- return print(indent, output).append(';');
- }
- public TypeBinding resolveType(BlockScope scope) {
-
- // due to syntax lhs may be only a NameReference, a FieldReference or an ArrayReference
- constant = NotAConstant;
- if (!(this.lhs instanceof Reference)) {
- scope.problemReporter().expressionShouldBeAVariable(this.lhs);
- }
- this.resolvedType = lhs.resolveType(scope); // expressionType contains the assignment type (lhs Type)
- TypeBinding rhsType = expression.resolveType(scope);
- if (this.resolvedType == null || rhsType == null) {
- return null;
- }
- checkAssignmentEffect(scope);
-
- // 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(rhsType, this.resolvedType)
- || (this.resolvedType.isBaseType() && BaseTypeBinding.isWidening(this.resolvedType.id, rhsType.id)))
- || rhsType.isCompatibleWith(this.resolvedType)) {
- expression.implicitWidening(this.resolvedType, rhsType);
- return this.resolvedType;
- }
- scope.problemReporter().typeMismatchErrorActualTypeExpectedType(
- expression,
- rhsType,
- this.resolvedType);
- return this.resolvedType;
- }
-
- 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(ASTVisitor 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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