/******************************************************************************* * Copyright (c) 2000, 2010 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Nick Teryaev - fix for bug (https://bugs.eclipse.org/bugs/show_bug.cgi?id=40752) *******************************************************************************/ package org.eclipse.jdt.internal.compiler.ast; import org.eclipse.jdt.internal.compiler.ASTVisitor; import org.eclipse.jdt.internal.compiler.codegen.CodeStream; import org.eclipse.jdt.internal.compiler.flow.FlowContext; import org.eclipse.jdt.internal.compiler.flow.FlowInfo; import org.eclipse.jdt.internal.compiler.impl.CompilerOptions; import org.eclipse.jdt.internal.compiler.impl.Constant; import org.eclipse.jdt.internal.compiler.lookup.ArrayBinding; import org.eclipse.jdt.internal.compiler.lookup.Binding; import org.eclipse.jdt.internal.compiler.lookup.BlockScope; import org.eclipse.jdt.internal.compiler.lookup.InvocationSite; import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding; import org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment; import org.eclipse.jdt.internal.compiler.lookup.MethodBinding; import org.eclipse.jdt.internal.compiler.lookup.ParameterizedGenericMethodBinding; import org.eclipse.jdt.internal.compiler.lookup.ParameterizedTypeBinding; import org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding; import org.eclipse.jdt.internal.compiler.lookup.Scope; import org.eclipse.jdt.internal.compiler.lookup.TagBits; import org.eclipse.jdt.internal.compiler.lookup.TypeBinding; import org.eclipse.jdt.internal.compiler.lookup.TypeIds; import org.eclipse.jdt.internal.compiler.problem.ProblemSeverities; public class CastExpression extends Expression { public Expression expression; public Expression type; public TypeBinding expectedType; // when assignment conversion to a given expected type: String s = (String) t; //expression.implicitConversion holds the cast for baseType casting public CastExpression(Expression expression, Expression type) { this.expression= expression; this.type= type; type.bits|= ASTNode.IgnoreRawTypeCheck; // no need to worry about raw type usage } public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) { return this.expression .analyseCode(currentScope, flowContext, flowInfo) .unconditionalInits(); } /** * Complain if assigned expression is cast, but not actually used as such, e.g. Object o = * (List) object; */ public static void checkNeedForAssignedCast(BlockScope scope, TypeBinding expectedType, CastExpression rhs) { if (scope.compilerOptions().getSeverity(CompilerOptions.UnnecessaryTypeCheck) == ProblemSeverities.Ignore) return; TypeBinding castedExpressionType= rhs.expression.resolvedType; // int i = (byte) n; // cast still had side effect // double d = (float) n; // cast to float is unnecessary if (castedExpressionType == null || rhs.resolvedType.isBaseType()) return; //if (castedExpressionType.id == T_null) return; // tolerate null expression cast if (castedExpressionType.isCompatibleWith(expectedType)) { scope.problemReporter().unnecessaryCast(rhs); } } /** * Complain if cast expression is cast, but not actually needed, int i = (int)(Integer) 12; Note * that this (int) cast is however needed: Integer i = 0; char c = (char)((int) i); */ public static void checkNeedForCastCast(BlockScope scope, CastExpression enclosingCast) { if (scope.compilerOptions().getSeverity(CompilerOptions.UnnecessaryTypeCheck) == ProblemSeverities.Ignore) return; CastExpression nestedCast= (CastExpression)enclosingCast.expression; if ((nestedCast.bits & ASTNode.UnnecessaryCast) == 0) return; // check if could cast directly to enclosing cast type, without intermediate type cast CastExpression alternateCast= new CastExpression(null, enclosingCast.type); alternateCast.resolvedType= enclosingCast.resolvedType; if (!alternateCast.checkCastTypesCompatibility(scope, enclosingCast.resolvedType, nestedCast.expression.resolvedType, null /* no expr to avoid side-effects*/)) return; scope.problemReporter().unnecessaryCast(nestedCast); } /** * Casting an enclosing instance will considered as useful if removing it would actually bind to * a different type */ public static void checkNeedForEnclosingInstanceCast(BlockScope scope, Expression enclosingInstance, TypeBinding enclosingInstanceType, TypeBinding memberType) { if (scope.compilerOptions().getSeverity(CompilerOptions.UnnecessaryTypeCheck) == ProblemSeverities.Ignore) return; TypeBinding castedExpressionType= ((CastExpression)enclosingInstance).expression.resolvedType; if (castedExpressionType == null) return; // cannot do better // obvious identity cast if (castedExpressionType == enclosingInstanceType) { scope.problemReporter().unnecessaryCast((CastExpression)enclosingInstance); } else if (castedExpressionType == TypeBinding.NULL) { return; // tolerate null enclosing instance cast } else { TypeBinding alternateEnclosingInstanceType= castedExpressionType; if (castedExpressionType.isBaseType() || castedExpressionType.isArrayType()) return; // error case if (memberType == scope.getMemberType(memberType.sourceName(), (ReferenceBinding)alternateEnclosingInstanceType)) { scope.problemReporter().unnecessaryCast((CastExpression)enclosingInstance); } } } /** * Only complain for identity cast, since other type of casts may be useful: e.g. ~((~(long) 0) * << 32) is different from: ~((~0) << 32) */ public static void checkNeedForArgumentCast(BlockScope scope, int operator, int operatorSignature, Expression expression, int expressionTypeId) { if (scope.compilerOptions().getSeverity(CompilerOptions.UnnecessaryTypeCheck) == ProblemSeverities.Ignore) return; // check need for left operand cast if ((expression.bits & ASTNode.UnnecessaryCast) == 0 && expression.resolvedType.isBaseType()) { // narrowing conversion on base type may change value, thus necessary return; } else { TypeBinding alternateLeftType= ((CastExpression)expression).expression.resolvedType; if (alternateLeftType == null) return; // cannot do better if (alternateLeftType.id == expressionTypeId) { // obvious identity cast scope.problemReporter().unnecessaryCast((CastExpression)expression); return; } } } /** * Cast expressions will considered as useful if removing them all would actually bind to a * different method (no fine grain analysis on per casted argument basis, simply separate * widening cast from narrowing ones) */ public static void checkNeedForArgumentCasts(BlockScope scope, Expression receiver, TypeBinding receiverType, MethodBinding binding, Expression[] arguments, TypeBinding[] argumentTypes, final InvocationSite invocationSite) { if (scope.compilerOptions().getSeverity(CompilerOptions.UnnecessaryTypeCheck) == ProblemSeverities.Ignore) return; int length= argumentTypes.length; // iterate over arguments, and retrieve original argument types (before cast) TypeBinding[] rawArgumentTypes= argumentTypes; for (int i= 0; i < length; i++) { Expression argument= arguments[i]; if (argument instanceof CastExpression) { // narrowing conversion on base type may change value, thus necessary if ((argument.bits & ASTNode.UnnecessaryCast) == 0 && argument.resolvedType.isBaseType()) { continue; } TypeBinding castedExpressionType= ((CastExpression)argument).expression.resolvedType; if (castedExpressionType == null) return; // cannot do better // obvious identity cast if (castedExpressionType == argumentTypes[i]) { scope.problemReporter().unnecessaryCast((CastExpression)argument); } else if (castedExpressionType == TypeBinding.NULL) { continue; // tolerate null argument cast } else if ((argument.implicitConversion & TypeIds.BOXING) != 0) { continue; // boxing has a side effect: (int) char is not boxed as simple char } else { if (rawArgumentTypes == argumentTypes) { System.arraycopy(rawArgumentTypes, 0, rawArgumentTypes= new TypeBinding[length], 0, length); } // retain original argument type rawArgumentTypes[i]= castedExpressionType; } } } // perform alternate lookup with original types if (rawArgumentTypes != argumentTypes) { checkAlternateBinding(scope, receiver, receiverType, binding, arguments, argumentTypes, rawArgumentTypes, invocationSite); } } /** * Check binary operator casted arguments */ public static void checkNeedForArgumentCasts(BlockScope scope, int operator, int operatorSignature, Expression left, int leftTypeId, boolean leftIsCast, Expression right, int rightTypeId, boolean rightIsCast) { if (scope.compilerOptions().getSeverity(CompilerOptions.UnnecessaryTypeCheck) == ProblemSeverities.Ignore) return; // check need for left operand cast int alternateLeftTypeId= leftTypeId; if (leftIsCast) { if ((left.bits & ASTNode.UnnecessaryCast) == 0 && left.resolvedType.isBaseType()) { // narrowing conversion on base type may change value, thus necessary leftIsCast= false; } else { TypeBinding alternateLeftType= ((CastExpression)left).expression.resolvedType; if (alternateLeftType == null) return; // cannot do better if ((alternateLeftTypeId= alternateLeftType.id) == leftTypeId || scope.environment().computeBoxingType(alternateLeftType).id == leftTypeId) { // obvious identity cast scope.problemReporter().unnecessaryCast((CastExpression)left); leftIsCast= false; } else if (alternateLeftTypeId == TypeIds.T_null) { alternateLeftTypeId= leftTypeId; // tolerate null argument cast leftIsCast= false; } } } // check need for right operand cast int alternateRightTypeId= rightTypeId; if (rightIsCast) { if ((right.bits & ASTNode.UnnecessaryCast) == 0 && right.resolvedType.isBaseType()) { // narrowing conversion on base type may change value, thus necessary rightIsCast= false; } else { TypeBinding alternateRightType= ((CastExpression)right).expression.resolvedType; if (alternateRightType == null) return; // cannot do better if ((alternateRightTypeId= alternateRightType.id) == rightTypeId || scope.environment().computeBoxingType(alternateRightType).id == rightTypeId) { // obvious identity cast scope.problemReporter().unnecessaryCast((CastExpression)right); rightIsCast= false; } else if (alternateRightTypeId == TypeIds.T_null) { alternateRightTypeId= rightTypeId; // tolerate null argument cast rightIsCast= false; } } } if (leftIsCast || rightIsCast) { if (alternateLeftTypeId > 15 || alternateRightTypeId > 15) { // must convert String + Object || Object + String if (alternateLeftTypeId == TypeIds.T_JavaLangString) { alternateRightTypeId= TypeIds.T_JavaLangObject; } else if (alternateRightTypeId == TypeIds.T_JavaLangString) { alternateLeftTypeId= TypeIds.T_JavaLangObject; } else { return; // invalid operator } } int alternateOperatorSignature= OperatorExpression.OperatorSignatures[operator][(alternateLeftTypeId << 4) + alternateRightTypeId]; // (cast) left Op (cast) right --> result // 1111 0000 1111 0000 1111 // <<16 <<12 <<8 <<4 <<0 final int CompareMASK= (0xF << 16) + (0xF << 8) + 0xF; // mask hiding compile-time types if ((operatorSignature & CompareMASK) == (alternateOperatorSignature & CompareMASK)) { // same promotions and result if (leftIsCast) scope.problemReporter().unnecessaryCast((CastExpression)left); if (rightIsCast) scope.problemReporter().unnecessaryCast((CastExpression)right); } } } private static void checkAlternateBinding(BlockScope scope, Expression receiver, TypeBinding receiverType, MethodBinding binding, Expression[] arguments, TypeBinding[] originalArgumentTypes, TypeBinding[] alternateArgumentTypes, final InvocationSite invocationSite) { InvocationSite fakeInvocationSite= new InvocationSite() { public TypeBinding[] genericTypeArguments() { return null; } public boolean isSuperAccess() { return invocationSite.isSuperAccess(); } public boolean isTypeAccess() { return invocationSite.isTypeAccess(); } public void setActualReceiverType(ReferenceBinding actualReceiverType) { /* ignore */ } public void setDepth(int depth) { /* ignore */ } public void setFieldIndex(int depth) { /* ignore */ } public int sourceStart() { return 0; } public int sourceEnd() { return 0; } }; MethodBinding bindingIfNoCast; if (binding.isConstructor()) { bindingIfNoCast= scope.getConstructor((ReferenceBinding)receiverType, alternateArgumentTypes, fakeInvocationSite); } else { bindingIfNoCast= receiver.isImplicitThis() ? scope.getImplicitMethod(binding.selector, alternateArgumentTypes, fakeInvocationSite) : scope.getMethod(receiverType, binding.selector, alternateArgumentTypes, fakeInvocationSite); } if (bindingIfNoCast == binding) { int argumentLength= originalArgumentTypes.length; if (binding.isVarargs()) { int paramLength= binding.parameters.length; if (paramLength == argumentLength) { int varargsIndex= paramLength - 1; ArrayBinding varargsType= (ArrayBinding)binding.parameters[varargsIndex]; TypeBinding lastArgType= alternateArgumentTypes[varargsIndex]; // originalType may be compatible already, but cast mandated // to clarify between varargs/non-varargs call if (varargsType.dimensions != lastArgType.dimensions()) { return; } if (lastArgType.isCompatibleWith(varargsType.elementsType()) && lastArgType.isCompatibleWith(varargsType)) { return; } } } for (int i= 0; i < argumentLength; i++) { if (originalArgumentTypes[i] != alternateArgumentTypes[i] /*&& !originalArgumentTypes[i].needsUncheckedConversion(alternateArgumentTypes[i])*/) { scope.problemReporter().unnecessaryCast((CastExpression)arguments[i]); } } } } public boolean checkUnsafeCast(Scope scope, TypeBinding castType, TypeBinding expressionType, TypeBinding match, boolean isNarrowing) { if (match == castType) { if (!isNarrowing && match == this.resolvedType.leafComponentType()) { // do not tag as unnecessary when recursing through upper bounds tagAsUnnecessaryCast(scope, castType); } return true; } if (match != null) { if (isNarrowing ? match.isProvablyDistinct(expressionType) : castType.isProvablyDistinct(match)) { return false; } } switch (castType.kind()) { case Binding.PARAMETERIZED_TYPE: if (!castType.isReifiable()) { if (match == null) { // unrelated types this.bits|= ASTNode.UnsafeCast; return true; } switch (match.kind()) { case Binding.PARAMETERIZED_TYPE: if (isNarrowing) { // [JLS 5.5] T <: S if (expressionType.isRawType() || !expressionType.isEquivalentTo(match)) { this.bits|= ASTNode.UnsafeCast; return true; } // [JLS 5.5] S has no subtype X != T, such that |X| == |T| // if I2<T,U> extends I1<T>, then cast from I1<T> to I2<T,U> is unchecked ParameterizedTypeBinding paramCastType= (ParameterizedTypeBinding)castType; ParameterizedTypeBinding paramMatch= (ParameterizedTypeBinding)match; // easy case if less parameters on match TypeBinding[] castArguments= paramCastType.arguments; int length= castArguments == null ? 0 : castArguments.length; if (paramMatch.arguments == null || length > paramMatch.arguments.length) { this.bits|= ASTNode.UnsafeCast; } else if ((paramCastType.tagBits & (TagBits.HasDirectWildcard | TagBits.HasTypeVariable)) != 0) { // verify alternate cast type, substituting different type arguments nextAlternateArgument: for (int i= 0; i < length; i++) { switch (castArguments[i].kind()) { case Binding.WILDCARD_TYPE: case Binding.TYPE_PARAMETER: break; // check substituting with other default: continue nextAlternateArgument; // no alternative possible } TypeBinding[] alternateArguments; // need to clone for each iteration to avoid env paramtype cache interference System.arraycopy(paramCastType.arguments, 0, alternateArguments= new TypeBinding[length], 0, length); alternateArguments[i]= scope.getJavaLangObject(); LookupEnvironment environment= scope.environment(); ParameterizedTypeBinding alternateCastType= environment.createParameterizedType((ReferenceBinding)castType.erasure(), alternateArguments, castType.enclosingType()); if (alternateCastType.findSuperTypeOriginatingFrom(expressionType) == match) { this.bits|= ASTNode.UnsafeCast; break; } } } return true; } else { // [JLS 5.5] T >: S if (!match.isEquivalentTo(castType)) { this.bits|= ASTNode.UnsafeCast; return true; } } break; case Binding.RAW_TYPE: this.bits|= ASTNode.UnsafeCast; // upcast since castType is known to be bound paramType return true; default: if (isNarrowing) { // match is not parameterized or raw, then any other subtype of match will erase to |T| this.bits|= ASTNode.UnsafeCast; return true; } break; } } break; case Binding.ARRAY_TYPE: TypeBinding leafType= castType.leafComponentType(); if (isNarrowing && (!leafType.isReifiable() || leafType.isTypeVariable())) { this.bits|= ASTNode.UnsafeCast; return true; } break; case Binding.TYPE_PARAMETER: this.bits|= ASTNode.UnsafeCast; return true; // (disabled) https://bugs.eclipse.org/bugs/show_bug.cgi?id=240807 // case Binding.TYPE : // if (isNarrowing && match == null && expressionType.isParameterizedType()) { // this.bits |= ASTNode.UnsafeCast; // return true; // } // break; } if (!isNarrowing && match == this.resolvedType.leafComponentType()) { // do not tag as unnecessary when recursing through upper bounds tagAsUnnecessaryCast(scope, castType); } return true; } /** * Cast expression 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) { int pc= codeStream.position; boolean needRuntimeCheckcast= (this.bits & ASTNode.GenerateCheckcast) != 0; if (this.constant != Constant.NotAConstant) { if (valueRequired || needRuntimeCheckcast) { // Added for: 1F1W9IG: IVJCOM:WINNT - Compiler omits casting check codeStream.generateConstant(this.constant, this.implicitConversion); if (needRuntimeCheckcast) { codeStream.checkcast(this.resolvedType); } if (!valueRequired) { // the resolveType cannot be double or long codeStream.pop(); } } codeStream.recordPositionsFrom(pc, this.sourceStart); return; } this.expression.generateCode(currentScope, codeStream, valueRequired || needRuntimeCheckcast); if (needRuntimeCheckcast && this.expression.postConversionType(currentScope) != this.resolvedType.erasure()) { // no need to issue a checkcast if already done as genericCast codeStream.checkcast(this.resolvedType); } if (valueRequired) { codeStream.generateImplicitConversion(this.implicitConversion); } else if (needRuntimeCheckcast) { codeStream.pop(); } codeStream.recordPositionsFrom(pc, this.sourceStart); } public Expression innermostCastedExpression() { Expression current= this.expression; while (current instanceof CastExpression) { current= ((CastExpression)current).expression; } return current; } /** * @see org.eclipse.jdt.internal.compiler.ast.Expression#localVariableBinding() */ public LocalVariableBinding localVariableBinding() { return this.expression.localVariableBinding(); } public int nullStatus(FlowInfo flowInfo) { return this.expression.nullStatus(flowInfo); } /** * @see org.eclipse.jdt.internal.compiler.ast.Expression#optimizedBooleanConstant() */ public Constant optimizedBooleanConstant() { switch (this.resolvedType.id) { case T_boolean: case T_JavaLangBoolean: return this.expression.optimizedBooleanConstant(); } return Constant.NotAConstant; } public StringBuffer printExpression(int indent, StringBuffer output) { output.append('('); this.type.print(0, output).append(") "); //$NON-NLS-1$ return this.expression.printExpression(0, output); } public TypeBinding resolveType(BlockScope scope) { // compute a new constant if the cast is effective // due to the fact an expression may start with ( and that a cast can also start with ( // the field is an expression....it can be a TypeReference OR a NameReference Or // any kind of Expression <-- this last one is invalid....... this.constant= Constant.NotAConstant; this.implicitConversion= TypeIds.T_undefined; if ((this.type instanceof TypeReference) || (this.type instanceof NameReference) && ((this.type.bits & ASTNode.ParenthesizedMASK) >> ASTNode.ParenthesizedSHIFT) == 0) { // no extra parenthesis around type: ((A))exp boolean exprContainCast= false; TypeBinding castType= this.resolvedType= this.type.resolveType(scope); //expression.setExpectedType(this.resolvedType); // needed in case of generic method invocation if (this.expression instanceof CastExpression) { this.expression.bits|= ASTNode.DisableUnnecessaryCastCheck; exprContainCast= true; } TypeBinding expressionType= this.expression.resolveType(scope); if (castType != null) { if (expressionType != null) { boolean isLegal= checkCastTypesCompatibility(scope, castType, expressionType, this.expression); if (isLegal) { this.expression.computeConversion(scope, castType, expressionType); if ((this.bits & ASTNode.UnsafeCast) != 0) { // unsafe cast scope.problemReporter().unsafeCast(this, scope); } else { if (castType.isRawType() && scope.compilerOptions().getSeverity(CompilerOptions.RawTypeReference) != ProblemSeverities.Ignore) { scope.problemReporter().rawTypeReference(this.type, castType); } if ((this.bits & (ASTNode.UnnecessaryCast | ASTNode.DisableUnnecessaryCastCheck)) == ASTNode.UnnecessaryCast) { // unnecessary cast if (!isIndirectlyUsed()) // used for generic type inference or boxing ? scope.problemReporter().unnecessaryCast(this); } } } else { // illegal cast if ((castType.tagBits & TagBits.HasMissingType) == 0) { // no complaint if secondary error scope.problemReporter().typeCastError(this, castType, expressionType); } this.bits|= ASTNode.DisableUnnecessaryCastCheck; // disable further secondary diagnosis } } this.resolvedType= castType.capture(scope, this.sourceEnd); if (exprContainCast) { checkNeedForCastCast(scope, this); } } return this.resolvedType; } else { // expression as a cast TypeBinding expressionType= this.expression.resolveType(scope); if (expressionType == null) return null; scope.problemReporter().invalidTypeReference(this.type); return null; } } /** * @see org.eclipse.jdt.internal.compiler.ast.Expression#setExpectedType(org.eclipse.jdt.internal.compiler.lookup.TypeBinding) */ public void setExpectedType(TypeBinding expectedType) { this.expectedType= expectedType; } /** * Determines whether apparent unnecessary cast wasn't actually used to perform return type * inference of generic method invocation or boxing. */ private boolean isIndirectlyUsed() { if (this.expression instanceof MessageSend) { MethodBinding method= ((MessageSend)this.expression).binding; if (method instanceof ParameterizedGenericMethodBinding && ((ParameterizedGenericMethodBinding)method).inferredReturnType) { if (this.expectedType == null) return true; if (this.resolvedType != this.expectedType) return true; } } if (this.expectedType != null && this.resolvedType.isBaseType() && !this.resolvedType.isCompatibleWith(this.expectedType)) { // boxing: Short s = (short) _byte return true; } return false; } /** * @see org.eclipse.jdt.internal.compiler.ast.Expression#tagAsNeedCheckCast() */ public void tagAsNeedCheckCast() { this.bits|= ASTNode.GenerateCheckcast; } /** * @see org.eclipse.jdt.internal.compiler.ast.Expression#tagAsUnnecessaryCast(Scope, * TypeBinding) */ public void tagAsUnnecessaryCast(Scope scope, TypeBinding castType) { this.bits|= ASTNode.UnnecessaryCast; } public void traverse(ASTVisitor visitor, BlockScope blockScope) { if (visitor.visit(this, blockScope)) { this.type.traverse(visitor, blockScope); this.expression.traverse(visitor, blockScope); } visitor.endVisit(this, blockScope); } }