+++ /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
- *******************************************************************************/
-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.impl.Constant;
-import net.sourceforge.phpdt.internal.compiler.lookup.ArrayBinding;
-import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
-import net.sourceforge.phpdt.internal.compiler.lookup.MethodBinding;
-import net.sourceforge.phpdt.internal.compiler.lookup.ReferenceBinding;
-import net.sourceforge.phpdt.internal.compiler.lookup.Scope;
-import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
-
-public class EqualExpression extends BinaryExpression {
-
-public EqualExpression(Expression left, Expression right,int operator) {
- super(left,right,operator);
-}
-public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
- if (((bits & OperatorMASK) >> OperatorSHIFT) == EQUAL_EQUAL) {
- if ((left.constant != NotAConstant) && (left.constant.typeID() == T_boolean)) {
- if (left.constant.booleanValue()) { // true == anything
- // this is equivalent to the right argument inits
- return right.analyseCode(currentScope, flowContext, flowInfo);
- } else { // false == anything
- // this is equivalent to the right argument inits negated
- return right.analyseCode(currentScope, flowContext, flowInfo).asNegatedCondition();
- }
- }
- if ((right.constant != NotAConstant) && (right.constant.typeID() == T_boolean)) {
- if (right.constant.booleanValue()) { // anything == true
- // this is equivalent to the right argument inits
- return left.analyseCode(currentScope, flowContext, flowInfo);
- } else { // anything == false
- // this is equivalent to the right argument inits negated
- return left.analyseCode(currentScope, flowContext, flowInfo).asNegatedCondition();
- }
- }
- return right.analyseCode(
- currentScope, flowContext,
- left.analyseCode(currentScope, flowContext, flowInfo).unconditionalInits()).unconditionalInits();
- } else { //NOT_EQUAL :
- if ((left.constant != NotAConstant) && (left.constant.typeID() == T_boolean)) {
- if (!left.constant.booleanValue()) { // false != anything
- // this is equivalent to the right argument inits
- return right.analyseCode(currentScope, flowContext, flowInfo);
- } else { // true != anything
- // this is equivalent to the right argument inits negated
- return right.analyseCode(currentScope, flowContext, flowInfo).asNegatedCondition();
- }
- }
- if ((right.constant != NotAConstant) && (right.constant.typeID() == T_boolean)) {
- if (!right.constant.booleanValue()) { // anything != false
- // this is equivalent to the right argument inits
- return left.analyseCode(currentScope, flowContext, flowInfo);
- } else { // anything != true
- // this is equivalent to the right argument inits negated
- return left.analyseCode(currentScope, flowContext, flowInfo).asNegatedCondition();
- }
- }
- return right.analyseCode(
- currentScope, flowContext,
- left.analyseCode(currentScope, flowContext, flowInfo).unconditionalInits()).asNegatedCondition().unconditionalInits();
- }
-}
-public final boolean areTypesCastCompatible(BlockScope scope, TypeBinding castType, TypeBinding expressionType) {
- //see specifications 5.5
- //A more complete version of this method is provided on
- //CastExpression (it deals with constant and need runtime checkcast)
-
- if (castType == expressionType) return true;
-
- //========ARRAY===============
- if (expressionType.isArrayType()) {
- if (castType.isArrayType()) { //------- (castTb.isArray) expressionTb.isArray -----------
- TypeBinding expressionEltType = ((ArrayBinding) expressionType).elementsType(scope);
- if (expressionEltType.isBaseType())
- // <---stop the recursion-------
- return ((ArrayBinding) castType).elementsType(scope) == expressionEltType;
- //recursivly on the elts...
- return areTypesCastCompatible(scope, ((ArrayBinding) castType).elementsType(scope), expressionEltType);
- }
- if (castType.isBaseType()) {
- return false;
- }
- if (castType.isClass()) { //------(castTb.isClass) expressionTb.isArray ---------------
- if (scope.isJavaLangObject(castType))
- return true;
- return false;
- }
- if (castType.isInterface()) { //------- (castTb.isInterface) expressionTb.isArray -----------
- if (scope.isJavaLangCloneable(castType) || scope.isJavaIoSerializable(castType)) {
- return true;
- }
- return false;
- }
-
- return false;
- }
-
- //------------(castType) null--------------
- if (expressionType == NullBinding) {
- return !castType.isBaseType();
- }
-
- //========BASETYPE==============
- if (expressionType.isBaseType()) {
- return false;
- }
-
-
- //========REFERENCE TYPE===================
-
- if (expressionType.isClass()) {
- if (castType.isArrayType()) { // ---- (castTb.isArray) expressionTb.isClass -------
- if (scope.isJavaLangObject(expressionType))
- return true;
- }
- if (castType.isBaseType()) {
- return false;
- }
- if (castType.isClass()) { // ----- (castTb.isClass) expressionTb.isClass ------
- if (expressionType.isCompatibleWith(castType))
- return true;
- else {
- if (castType.isCompatibleWith(expressionType)) {
- return true;
- }
- return false;
- }
- }
- if (castType.isInterface()) { // ----- (castTb.isInterface) expressionTb.isClass -------
- if (((ReferenceBinding) expressionType).isFinal()) { //no subclass for expressionTb, thus compile-time check is valid
- if (expressionType.isCompatibleWith(castType))
- return true;
- return false;
- } else {
- return true;
- }
- }
-
- return false;
- }
- if (expressionType.isInterface()) {
- if (castType.isArrayType()) { // ----- (castTb.isArray) expressionTb.isInterface ------
- if (scope.isJavaLangCloneable(expressionType) || scope.isJavaIoSerializable(expressionType))
- //potential runtime error
- {
- return true;
- }
- return false;
- }
- if (castType.isBaseType()) {
- return false;
- }
- if (castType.isClass()) { // ----- (castTb.isClass) expressionTb.isInterface --------
- if (scope.isJavaLangObject(castType))
- return true;
- if (((ReferenceBinding) castType).isFinal()) { //no subclass for castTb, thus compile-time check is valid
- if (castType.isCompatibleWith(expressionType)) {
- return true;
- }
- return false;
- }
- return true;
- }
- if (castType.isInterface()) { // ----- (castTb.isInterface) expressionTb.isInterface -------
- if (Scope.compareTypes(castType, expressionType) == NotRelated) {
- MethodBinding[] castTbMethods = ((ReferenceBinding) castType).methods();
- int castTbMethodsLength = castTbMethods.length;
- MethodBinding[] expressionTbMethods = ((ReferenceBinding) expressionType).methods();
- int expressionTbMethodsLength = expressionTbMethods.length;
- for (int i = 0; i < castTbMethodsLength; i++) {
- for (int j = 0; j < expressionTbMethodsLength; j++) {
- if (castTbMethods[i].selector == expressionTbMethods[j].selector) {
- if (castTbMethods[i].returnType != expressionTbMethods[j].returnType) {
- if (castTbMethods[i].areParametersEqual(expressionTbMethods[j])) {
- return false;
- }
- }
- }
- }
- }
- }
- return true;
- }
-
- return false;
- }
-
- return false;
-}
-public final void computeConstant(TypeBinding leftType, TypeBinding rightType) {
- if ((this.left.constant != NotAConstant) && (this.right.constant != NotAConstant)) {
- this.constant =
- Constant.computeConstantOperationEQUAL_EQUAL(
- left.constant,
- leftType.id,
- EQUAL_EQUAL,
- right.constant,
- rightType.id);
- if (((this.bits & OperatorMASK) >> OperatorSHIFT) == NOT_EQUAL)
- constant = Constant.fromValue(!constant.booleanValue());
- } else {
- this.constant = NotAConstant;
- // no optimization for null == null
- }
-}
-/**
- * Normal == or != code generation.
- *
- * @param currentScope net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
- * @param codeStream net.sourceforge.phpdt.internal.compiler.codegen.CodeStream
- * @param valueRequired boolean
- */
-//public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
-//
-// if (constant != NotAConstant) {
-// int pc = codeStream.position;
-// if (valueRequired)
-// codeStream.generateConstant(constant, implicitConversion);
-// codeStream.recordPositionsFrom(pc, this.sourceStart);
-// return;
-// }
-// Label falseLabel;
-// bits |= OnlyValueRequiredMASK;
-// generateOptimizedBoolean(
-// currentScope,
-// codeStream,
-// null,
-// falseLabel = new Label(codeStream),
-// valueRequired);
-// if (falseLabel.hasForwardReferences()) {
-// if (valueRequired){
-// // comparison is TRUE
-// codeStream.iconst_1();
-// if ((bits & ValueForReturnMASK) != 0){
-// codeStream.ireturn();
-// // comparison is FALSE
-// falseLabel.place();
-// codeStream.iconst_0();
-// } else {
-// Label endLabel = new Label(codeStream);
-// codeStream.goto_(endLabel);
-// codeStream.decrStackSize(1);
-// // comparison is FALSE
-// falseLabel.place();
-// codeStream.iconst_0();
-// endLabel.place();
-// }
-// } else {
-// falseLabel.place();
-// }
-// }
-//}
-/**
- * Boolean operator code generation
- * Optimized operations are: == and !=
- */
-//public void generateOptimizedBoolean(BlockScope currentScope, CodeStream codeStream, Label trueLabel, Label falseLabel, boolean valueRequired) {
-//
-// if (constant != Constant.NotAConstant) {
-// super.generateOptimizedBoolean(currentScope, codeStream, trueLabel, falseLabel, valueRequired);
-// return;
-// }
-// if (((bits & OperatorMASK) >> OperatorSHIFT) == EQUAL_EQUAL) {
-// if ((left.implicitConversion & 0xF) /*compile-time*/ == T_boolean) {
-// generateOptimizedBooleanEqual(currentScope, codeStream, trueLabel, falseLabel, valueRequired);
-// } else {
-// generateOptimizedNonBooleanEqual(currentScope, codeStream, trueLabel, falseLabel, valueRequired);
-// }
-// } else {
-// if ((left.implicitConversion & 0xF) /*compile-time*/ == T_boolean) {
-// generateOptimizedBooleanEqual(currentScope, codeStream, falseLabel, trueLabel, valueRequired);
-// } else {
-// generateOptimizedNonBooleanEqual(currentScope, codeStream, falseLabel, trueLabel, valueRequired);
-// }
-// }
-//}
-/**
- * Boolean generation for == with boolean operands
- *
- * Note this code does not optimize conditional constants !!!!
- */
-//public void generateOptimizedBooleanEqual(BlockScope currentScope, CodeStream codeStream, Label trueLabel, Label falseLabel, boolean valueRequired) {
-//
-// // optimized cases: true == x, false == x
-// if (left.constant != NotAConstant) {
-// boolean inline = left.constant.booleanValue();
-// right.generateOptimizedBoolean(currentScope, codeStream, (inline ? trueLabel : falseLabel), (inline ? falseLabel : trueLabel), valueRequired);
-// return;
-// } // optimized cases: x == true, x == false
-// if (right.constant != NotAConstant) {
-// boolean inline = right.constant.booleanValue();
-// left.generateOptimizedBoolean(currentScope, codeStream, (inline ? trueLabel : falseLabel), (inline ? falseLabel : trueLabel), valueRequired);
-// return;
-// }
-// // default case
-// left.generateCode(currentScope, codeStream, valueRequired);
-// right.generateCode(currentScope, codeStream, valueRequired);
-// if (valueRequired) {
-// if (falseLabel == null) {
-// if (trueLabel != null) {
-// // implicit falling through the FALSE case
-// codeStream.if_icmpeq(trueLabel);
-// }
-// } else {
-// // implicit falling through the TRUE case
-// if (trueLabel == null) {
-// codeStream.if_icmpne(falseLabel);
-// } else {
-// // no implicit fall through TRUE/FALSE --> should never occur
-// }
-// }
-// }
-// // reposition the endPC
-// codeStream.updateLastRecordedEndPC(codeStream.position);
-//}
-///**
-// * Boolean generation for == with non-boolean operands
-// *
-// */
-//public void generateOptimizedNonBooleanEqual(BlockScope currentScope, CodeStream codeStream, Label trueLabel, Label falseLabel, boolean valueRequired) {
-//
-// int pc = codeStream.position;
-// Constant inline;
-// if ((inline = right.constant) != NotAConstant) {
-// // optimized case: x == 0
-// if (((left.implicitConversion >> 4) == T_int) && (inline.intValue() == 0)) {
-// left.generateCode(currentScope, codeStream, valueRequired);
-// if (valueRequired) {
-// if (falseLabel == null) {
-// if (trueLabel != null) {
-// // implicit falling through the FALSE case
-// codeStream.ifeq(trueLabel);
-// }
-// } else {
-// // implicit falling through the TRUE case
-// if (trueLabel == null) {
-// codeStream.ifne(falseLabel);
-// } else {
-// // no implicit fall through TRUE/FALSE --> should never occur
-// }
-// }
-// }
-// codeStream.recordPositionsFrom(pc, this.sourceStart);
-// return;
-// }
-// }
-// if ((inline = left.constant) != NotAConstant) {
-// // optimized case: 0 == x
-// if (((left.implicitConversion >> 4) == T_int)
-// && (inline.intValue() == 0)) {
-// right.generateCode(currentScope, codeStream, valueRequired);
-// if (valueRequired) {
-// if (falseLabel == null) {
-// if (trueLabel != null) {
-// // implicit falling through the FALSE case
-// codeStream.ifeq(trueLabel);
-// }
-// } else {
-// // implicit falling through the TRUE case
-// if (trueLabel == null) {
-// codeStream.ifne(falseLabel);
-// } else {
-// // no implicit fall through TRUE/FALSE --> should never occur
-// }
-// }
-// }
-// codeStream.recordPositionsFrom(pc, this.sourceStart);
-// return;
-// }
-// }
-// // null cases
-// // optimized case: x == null
-// if (right instanceof NullLiteral) {
-// if (left instanceof NullLiteral) {
-// // null == null
-// if (valueRequired) {
-// if ((bits & OnlyValueRequiredMASK) != 0) {
-// if (((bits & OperatorMASK) >> OperatorSHIFT) == EQUAL_EQUAL) {
-// codeStream.iconst_1();
-// } else {
-// codeStream.iconst_0();
-// }
-// } else {
-// if (falseLabel == null) {
-// // implicit falling through the FALSE case
-// if (trueLabel != null) {
-// codeStream.goto_(trueLabel);
-// }
-// }
-// }
-// }
-// } else {
-// left.generateCode(currentScope, codeStream, valueRequired);
-// if (valueRequired) {
-// if (falseLabel == null) {
-// if (trueLabel != null) {
-// // implicit falling through the FALSE case
-// codeStream.ifnull(trueLabel);
-// }
-// } else {
-// // implicit falling through the TRUE case
-// if (trueLabel == null) {
-// codeStream.ifnonnull(falseLabel);
-// } else {
-// // no implicit fall through TRUE/FALSE --> should never occur
-// }
-// }
-// }
-// }
-// codeStream.recordPositionsFrom(pc, this.sourceStart);
-// return;
-// } else if (left instanceof NullLiteral) { // optimized case: null == x
-// right.generateCode(currentScope, codeStream, valueRequired);
-// if (valueRequired) {
-// if (falseLabel == null) {
-// if (trueLabel != null) {
-// // implicit falling through the FALSE case
-// codeStream.ifnull(trueLabel);
-// }
-// } else {
-// // implicit falling through the TRUE case
-// if (trueLabel == null) {
-// codeStream.ifnonnull(falseLabel);
-// } else {
-// // no implicit fall through TRUE/FALSE --> should never occur
-// }
-// }
-// }
-// codeStream.recordPositionsFrom(pc, this.sourceStart);
-// return;
-// }
-//
-// // default case
-// left.generateCode(currentScope, codeStream, valueRequired);
-// right.generateCode(currentScope, codeStream, valueRequired);
-// if (valueRequired) {
-// if (falseLabel == null) {
-// if (trueLabel != null) {
-// // implicit falling through the FALSE case
-// switch (left.implicitConversion >> 4) { // operand runtime type
-// case T_int :
-// codeStream.if_icmpeq(trueLabel);
-// break;
-// case T_float :
-// codeStream.fcmpl();
-// codeStream.ifeq(trueLabel);
-// break;
-// case T_long :
-// codeStream.lcmp();
-// codeStream.ifeq(trueLabel);
-// break;
-// case T_double :
-// codeStream.dcmpl();
-// codeStream.ifeq(trueLabel);
-// break;
-// default :
-// codeStream.if_acmpeq(trueLabel);
-// }
-// }
-// } else {
-// // implicit falling through the TRUE case
-// if (trueLabel == null) {
-// switch (left.implicitConversion >> 4) { // operand runtime type
-// case T_int :
-// codeStream.if_icmpne(falseLabel);
-// break;
-// case T_float :
-// codeStream.fcmpl();
-// codeStream.ifne(falseLabel);
-// break;
-// case T_long :
-// codeStream.lcmp();
-// codeStream.ifne(falseLabel);
-// break;
-// case T_double :
-// codeStream.dcmpl();
-// codeStream.ifne(falseLabel);
-// break;
-// default :
-// codeStream.if_acmpne(falseLabel);
-// }
-// } else {
-// // no implicit fall through TRUE/FALSE --> should never occur
-// }
-// }
-// }
-// codeStream.recordPositionsFrom(pc, this.sourceStart);
-//}
-public boolean isCompactableOperation() {
- return false;
-}
-public TypeBinding resolveType(BlockScope scope) {
- // always return BooleanBinding
- TypeBinding leftType = left.resolveType(scope);
- TypeBinding rightType = right.resolveType(scope);
- if (leftType == null || rightType == null){
- constant = NotAConstant;
- return null;
- }
-
- // both base type
- if (leftType.isBaseType() && rightType.isBaseType()) {
- // the code is an int
- // (cast) left == (cast) rigth --> result
- // 0000 0000 0000 0000 0000
- // <<16 <<12 <<8 <<4 <<0
- int result = ResolveTypeTables[EQUAL_EQUAL][ (leftType.id << 4) + rightType.id];
- left.implicitConversion = result >>> 12;
- right.implicitConversion = (result >>> 4) & 0x000FF;
- bits |= result & 0xF;
- if ((result & 0x0000F) == T_undefined) {
- constant = Constant.NotAConstant;
- scope.problemReporter().invalidOperator(this, leftType, rightType);
- return null;
- }
- computeConstant(leftType, rightType);
- this.resolvedType = BooleanBinding;
- return BooleanBinding;
- }
-
- // Object references
- // spec 15.20.3
- if (areTypesCastCompatible(scope, rightType, leftType) || areTypesCastCompatible(scope, leftType, rightType)) {
- // (special case for String)
- if ((rightType.id == T_String) && (leftType.id == T_String))
- computeConstant(leftType, rightType);
- else
- constant = NotAConstant;
- if (rightType.id == T_String)
- right.implicitConversion = String2String;
- if (leftType.id == T_String)
- left.implicitConversion = String2String;
- this.resolvedType = BooleanBinding;
- return BooleanBinding;
- }
- constant = NotAConstant;
- scope.problemReporter().notCompatibleTypesError(this, leftType, rightType);
- return null;
-}
-public void traverse(ASTVisitor visitor, BlockScope scope) {
- if (visitor.visit(this, scope)) {
- left.traverse(visitor, scope);
- right.traverse(visitor, scope);
- }
- visitor.endVisit(this, scope);
-}
-}
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