+++ /dev/null
-/*******************************************************************************
- * Copyright (c) 2000, 2004 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 org.eclipse.jdt.internal.compiler.ast;
-
-import org.eclipse.jdt.core.compiler.CharOperation;
-import org.eclipse.jdt.internal.compiler.ASTVisitor;
-import org.eclipse.jdt.internal.compiler.impl.*;
-import org.eclipse.jdt.internal.compiler.codegen.*;
-import org.eclipse.jdt.internal.compiler.flow.*;
-import org.eclipse.jdt.internal.compiler.lookup.*;
-
-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 (castType.id == T_Object)
- return true;
- return false;
- }
- if (castType.isInterface()) { //------- (castTb.isInterface) expressionTb.isArray -----------
- if (castType.id == T_JavaLangCloneable || castType.id == T_JavaIoSerializable) {
- 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 (expressionType.id == T_Object)
- 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 (expressionType.isCompatibleWith(castType))
- return true;
- if (!((ReferenceBinding) expressionType).isFinal()) {
- return true;
- }
- //no subclass for expressionTb, thus compile-time check is valid
- }
-
- return false;
- }
- if (expressionType.isInterface()) {
- if (castType.isArrayType()) { // ----- (castTb.isArray) expressionTb.isInterface ------
- if (expressionType.id == T_JavaLangCloneable || expressionType.id == T_JavaIoSerializable)
- //potential runtime error
- {
- return true;
- }
- return false;
- }
- if (castType.isBaseType()) {
- return false;
- }
- if (castType.isClass()) { // ----- (castTb.isClass) expressionTb.isInterface --------
- if (castType.id == T_Object)
- 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 (expressionType.isCompatibleWith(castType))
- return true;
- if (!castType.isCompatibleWith(expressionType)) {
- 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 (CharOperation.equals(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 org.eclipse.jdt.internal.compiler.lookup.BlockScope
- * @param codeStream org.eclipse.jdt.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) {
-
- boolean leftIsCast, rightIsCast;
- if ((leftIsCast = left instanceof CastExpression) == true) left.bits |= IgnoreNeedForCastCheckMASK; // will check later on
- TypeBinding leftType = left.resolveType(scope);
-
- if ((rightIsCast = right instanceof CastExpression) == true) right.bits |= IgnoreNeedForCastCheckMASK; // will check later on
- TypeBinding rightType = right.resolveType(scope);
-
- // always return BooleanBinding
- 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) right --> result
- // 0000 0000 0000 0000 0000
- // <<16 <<12 <<8 <<4 <<0
- int operatorSignature = OperatorSignatures[EQUAL_EQUAL][ (leftType.id << 4) + rightType.id];
- left.implicitConversion = operatorSignature >>> 12;
- right.implicitConversion = (operatorSignature >>> 4) & 0x000FF;
- bits |= operatorSignature & 0xF;
- if ((operatorSignature & 0x0000F) == T_undefined) {
- constant = Constant.NotAConstant;
- scope.problemReporter().invalidOperator(this, leftType, rightType);
- return null;
- }
- // check need for operand cast
- if (leftIsCast || rightIsCast) {
- CastExpression.checkNeedForArgumentCasts(scope, EQUAL_EQUAL, operatorSignature, left, leftType.id, leftIsCast, right, rightType.id, rightIsCast);
- }
- computeConstant(leftType, rightType);
- return this.resolvedType = 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;
- }
- // check need for operand cast
- boolean unnecessaryLeftCast = (left.bits & UnnecessaryCastMask) != 0;
- boolean unnecessaryRightCast = (right.bits & UnnecessaryCastMask) != 0;
- if (unnecessaryLeftCast || unnecessaryRightCast) {
- TypeBinding alternateLeftType = unnecessaryLeftCast ? ((CastExpression)left).expression.resolvedType : leftType;
- TypeBinding alternateRightType = unnecessaryRightCast ? ((CastExpression)right).expression.resolvedType : rightType;
- if (areTypesCastCompatible(scope, alternateLeftType, alternateRightType)
- || areTypesCastCompatible(scope, alternateRightType, alternateLeftType)) {
- if (unnecessaryLeftCast) scope.problemReporter().unnecessaryCast((CastExpression)left);
- if (unnecessaryRightCast) scope.problemReporter().unnecessaryCast((CastExpression)right);
- }
- }
- return this.resolvedType = 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);
-}
-}
projects / org.ibex.tool.git / blobdiff