| /******************************************************************************* |
| * Copyright (c) 2000, 2011 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 |
| * |
| * This is an implementation of an early-draft specification developed under the Java |
| * Community Process (JCP) and is made available for testing and evaluation purposes |
| * only. The code is not compatible with any specification of the JCP. |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| * Stephan Herrmann - Contribution for bug 319201 - [null] no warning when unboxing SingleNameReference causes NPE |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.compiler.ast; |
| |
| import org.eclipse.jdt.internal.compiler.ASTVisitor; |
| import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants; |
| import org.eclipse.jdt.internal.compiler.codegen.CodeStream; |
| import org.eclipse.jdt.internal.compiler.codegen.Opcodes; |
| import org.eclipse.jdt.internal.compiler.flow.FlowContext; |
| import org.eclipse.jdt.internal.compiler.flow.FlowInfo; |
| import org.eclipse.jdt.internal.compiler.impl.Constant; |
| import org.eclipse.jdt.internal.compiler.lookup.Binding; |
| import org.eclipse.jdt.internal.compiler.lookup.BlockScope; |
| import org.eclipse.jdt.internal.compiler.lookup.ExtraCompilerModifiers; |
| import org.eclipse.jdt.internal.compiler.lookup.LocalTypeBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.MethodBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.ProblemMethodBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.ProblemReasons; |
| import org.eclipse.jdt.internal.compiler.lookup.ProblemReferenceBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.RawTypeBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.TagBits; |
| import org.eclipse.jdt.internal.compiler.lookup.TypeBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.TypeConstants; |
| import org.eclipse.jdt.internal.compiler.lookup.TypeIds; |
| |
| /** |
| * Variation on allocation, where can optionally be specified any of: |
| * - leading enclosing instance |
| * - trailing anonymous type |
| * - generic type arguments for generic constructor invocation |
| */ |
| public class QualifiedAllocationExpression extends AllocationExpression { |
| |
| //qualification may be on both side |
| public Expression enclosingInstance; |
| public TypeDeclaration anonymousType; |
| |
| public QualifiedAllocationExpression() { |
| // for subtypes |
| } |
| |
| public QualifiedAllocationExpression(TypeDeclaration anonymousType) { |
| this.anonymousType = anonymousType; |
| anonymousType.allocation = this; |
| } |
| |
| public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) { |
| // analyse the enclosing instance |
| if (this.enclosingInstance != null) { |
| flowInfo = this.enclosingInstance.analyseCode(currentScope, flowContext, flowInfo); |
| } |
| |
| // check captured variables are initialized in current context (26134) |
| checkCapturedLocalInitializationIfNecessary( |
| (ReferenceBinding)(this.anonymousType == null |
| ? this.binding.declaringClass.erasure() |
| : this.binding.declaringClass.superclass().erasure()), |
| currentScope, |
| flowInfo); |
| |
| // process arguments |
| if (this.arguments != null) { |
| for (int i = 0, count = this.arguments.length; i < count; i++) { |
| flowInfo = this.arguments[i].analyseCode(currentScope, flowContext, flowInfo); |
| if ((this.arguments[i].implicitConversion & TypeIds.UNBOXING) != 0) { |
| this.arguments[i].checkNPE(currentScope, flowContext, flowInfo); |
| } |
| } |
| } |
| |
| // analyse the anonymous nested type |
| if (this.anonymousType != null) { |
| flowInfo = this.anonymousType.analyseCode(currentScope, flowContext, flowInfo); |
| } |
| |
| // record some dependency information for exception types |
| ReferenceBinding[] thrownExceptions; |
| if (((thrownExceptions = this.binding.thrownExceptions).length) != 0) { |
| if ((this.bits & ASTNode.Unchecked) != 0 && this.genericTypeArguments == null) { |
| // https://bugs.eclipse.org/bugs/show_bug.cgi?id=277643, align with javac on JLS 15.12.2.6 |
| thrownExceptions = currentScope.environment().convertToRawTypes(this.binding.thrownExceptions, true, true); |
| } |
| // check exception handling |
| flowContext.checkExceptionHandlers( |
| thrownExceptions, |
| this, |
| flowInfo.unconditionalCopy(), |
| currentScope); |
| } |
| manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo); |
| manageSyntheticAccessIfNecessary(currentScope, flowInfo); |
| return flowInfo; |
| } |
| |
| public Expression enclosingInstance() { |
| |
| return this.enclosingInstance; |
| } |
| |
| public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) { |
| if (!valueRequired) |
| currentScope.problemReporter().unusedObjectAllocation(this); |
| int pc = codeStream.position; |
| MethodBinding codegenBinding = this.binding.original(); |
| ReferenceBinding allocatedType = codegenBinding.declaringClass; |
| codeStream.new_(allocatedType); |
| boolean isUnboxing = (this.implicitConversion & TypeIds.UNBOXING) != 0; |
| if (valueRequired || isUnboxing) { |
| codeStream.dup(); |
| } |
| // better highlight for allocation: display the type individually |
| if (this.type != null) { // null for enum constant body |
| codeStream.recordPositionsFrom(pc, this.type.sourceStart); |
| } else { |
| // push enum constant name and ordinal |
| codeStream.ldc(String.valueOf(this.enumConstant.name)); |
| codeStream.generateInlinedValue(this.enumConstant.binding.id); |
| } |
| // handling innerclass instance allocation - enclosing instance arguments |
| if (allocatedType.isNestedType()) { |
| codeStream.generateSyntheticEnclosingInstanceValues( |
| currentScope, |
| allocatedType, |
| enclosingInstance(), |
| this); |
| } |
| // generate the arguments for constructor |
| generateArguments(this.binding, this.arguments, currentScope, codeStream); |
| // handling innerclass instance allocation - outer local arguments |
| if (allocatedType.isNestedType()) { |
| codeStream.generateSyntheticOuterArgumentValues( |
| currentScope, |
| allocatedType, |
| this); |
| } |
| |
| // invoke constructor |
| if (this.syntheticAccessor == null) { |
| codeStream.invoke(Opcodes.OPC_invokespecial, codegenBinding, null /* default declaringClass */); |
| } else { |
| // synthetic accessor got some extra arguments appended to its signature, which need values |
| for (int i = 0, |
| max = this.syntheticAccessor.parameters.length - codegenBinding.parameters.length; |
| i < max; |
| i++) { |
| codeStream.aconst_null(); |
| } |
| codeStream.invoke(Opcodes.OPC_invokespecial, this.syntheticAccessor, null /* default declaringClass */); |
| } |
| if (valueRequired) { |
| codeStream.generateImplicitConversion(this.implicitConversion); |
| } else if (isUnboxing) { |
| // conversion only generated if unboxing |
| codeStream.generateImplicitConversion(this.implicitConversion); |
| switch (postConversionType(currentScope).id) { |
| case T_long : |
| case T_double : |
| codeStream.pop2(); |
| break; |
| default : |
| codeStream.pop(); |
| } |
| } |
| codeStream.recordPositionsFrom(pc, this.sourceStart); |
| |
| if (this.anonymousType != null) { |
| this.anonymousType.generateCode(currentScope, codeStream); |
| } |
| } |
| |
| public boolean isSuperAccess() { |
| |
| // necessary to lookup super constructor of anonymous type |
| return this.anonymousType != null; |
| } |
| |
| /* Inner emulation consists in either recording a dependency |
| * link only, or performing one level of propagation. |
| * |
| * Dependency mechanism is used whenever dealing with source target |
| * types, since by the time we reach them, we might not yet know their |
| * exact need. |
| */ |
| public void manageEnclosingInstanceAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) { |
| if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) == 0) { |
| ReferenceBinding allocatedTypeErasure = (ReferenceBinding) this.binding.declaringClass.erasure(); |
| |
| // perform some extra emulation work in case there is some and we are inside a local type only |
| if (allocatedTypeErasure.isNestedType() |
| && currentScope.enclosingSourceType().isLocalType()) { |
| |
| if (allocatedTypeErasure.isLocalType()) { |
| ((LocalTypeBinding) allocatedTypeErasure).addInnerEmulationDependent(currentScope, this.enclosingInstance != null); |
| } else { |
| // locally propagate, since we already now the desired shape for sure |
| currentScope.propagateInnerEmulation(allocatedTypeErasure, this.enclosingInstance != null); |
| } |
| } |
| } |
| } |
| |
| public StringBuffer printExpression(int indent, StringBuffer output) { |
| if (this.enclosingInstance != null) |
| this.enclosingInstance.printExpression(0, output).append('.'); |
| super.printExpression(0, output); |
| if (this.anonymousType != null) { |
| this.anonymousType.print(indent, output); |
| } |
| return output; |
| } |
| |
| public TypeBinding resolveType(BlockScope scope) { |
| // added for code assist...cannot occur with 'normal' code |
| if (this.anonymousType == null && this.enclosingInstance == null) { |
| return super.resolveType(scope); |
| } |
| |
| // Propagate the type checking to the arguments, and checks if the constructor is defined. |
| // ClassInstanceCreationExpression ::= Primary '.' 'new' SimpleName '(' ArgumentListopt ')' ClassBodyopt |
| // ClassInstanceCreationExpression ::= Name '.' 'new' SimpleName '(' ArgumentListopt ')' ClassBodyopt |
| |
| this.constant = Constant.NotAConstant; |
| TypeBinding enclosingInstanceType = null; |
| ReferenceBinding enclosingInstanceReference = null; |
| TypeBinding receiverType = null; |
| boolean hasError = false; |
| boolean enclosingInstanceContainsCast = false; |
| boolean argsContainCast = false; |
| |
| if (this.enclosingInstance != null) { |
| if (this.enclosingInstance instanceof CastExpression) { |
| this.enclosingInstance.bits |= ASTNode.DisableUnnecessaryCastCheck; // will check later on |
| enclosingInstanceContainsCast = true; |
| } |
| if ((enclosingInstanceType = this.enclosingInstance.resolveType(scope)) == null){ |
| hasError = true; |
| } else if (enclosingInstanceType.isBaseType() || enclosingInstanceType.isArrayType()) { |
| scope.problemReporter().illegalPrimitiveOrArrayTypeForEnclosingInstance( |
| enclosingInstanceType, |
| this.enclosingInstance); |
| hasError = true; |
| } else if (this.type instanceof QualifiedTypeReference) { |
| scope.problemReporter().illegalUsageOfQualifiedTypeReference((QualifiedTypeReference)this.type); |
| hasError = true; |
| } else if (!(enclosingInstanceReference = (ReferenceBinding) enclosingInstanceType).canBeSeenBy(scope)) { |
| // https://bugs.eclipse.org/bugs/show_bug.cgi?id=317212 |
| enclosingInstanceType = new ProblemReferenceBinding( |
| enclosingInstanceReference.compoundName, |
| enclosingInstanceReference, |
| ProblemReasons.NotVisible); |
| scope.problemReporter().invalidType(this.enclosingInstance, enclosingInstanceType); |
| hasError = true; |
| } else { |
| receiverType = ((SingleTypeReference) this.type).resolveTypeEnclosing(scope, (ReferenceBinding) enclosingInstanceType); |
| if (receiverType != null && enclosingInstanceContainsCast) { |
| CastExpression.checkNeedForEnclosingInstanceCast(scope, this.enclosingInstance, enclosingInstanceType, receiverType); |
| } |
| } |
| } else { |
| if (this.type == null) { |
| // initialization of an enum constant |
| receiverType = scope.enclosingSourceType(); |
| } else { |
| if ((this.type.bits & ASTNode.IsDiamond) == 0) { |
| receiverType = this.type.resolveType(scope, true /* check bounds*/); |
| } else { |
| // can be done only after type arguments and method arguments resolution |
| } |
| // check for parameterized allocation deferred to below. |
| } |
| } |
| |
| // resolve type arguments (for generic constructor call) |
| if (this.typeArguments != null) { |
| int length = this.typeArguments.length; |
| boolean argHasError = scope.compilerOptions().sourceLevel < ClassFileConstants.JDK1_5; |
| this.genericTypeArguments = new TypeBinding[length]; |
| for (int i = 0; i < length; i++) { |
| TypeReference typeReference = this.typeArguments[i]; |
| if ((this.genericTypeArguments[i] = typeReference.resolveType(scope, true /* check bounds*/)) == null) { |
| argHasError = true; |
| } |
| if (argHasError && typeReference instanceof Wildcard) { |
| scope.problemReporter().illegalUsageOfWildcard(typeReference); |
| } |
| } |
| if (argHasError) { |
| if (this.arguments != null) { // still attempt to resolve arguments |
| for (int i = 0, max = this.arguments.length; i < max; i++) { |
| this.arguments[i].resolveType(scope); |
| } |
| } |
| return null; |
| } |
| } |
| |
| // will check for null after args are resolved |
| TypeBinding[] argumentTypes = Binding.NO_PARAMETERS; |
| if (this.arguments != null) { |
| int length = this.arguments.length; |
| argumentTypes = new TypeBinding[length]; |
| for (int i = 0; i < length; i++) { |
| Expression argument = this.arguments[i]; |
| if (argument instanceof CastExpression) { |
| argument.bits |= ASTNode.DisableUnnecessaryCastCheck; // will check later on |
| argsContainCast = true; |
| } |
| if ((argumentTypes[i] = argument.resolveType(scope)) == null){ |
| hasError = true; |
| } |
| } |
| } |
| if (this.type != null && (this.type.bits & ASTNode.IsDiamond) != 0) { |
| // Perform diamond inference here. (Not done yet.) |
| receiverType = this.type.resolveType(scope, true /* check bounds*/); // for now just do what we do for 1.6- |
| } |
| checkParameterizedAllocation: { |
| if (receiverType == null || !receiverType.isValidBinding()) break checkParameterizedAllocation; |
| if (this.type instanceof ParameterizedQualifiedTypeReference) { // disallow new X<String>.Y<Integer>() |
| ReferenceBinding currentType = (ReferenceBinding)receiverType; |
| do { |
| // isStatic() is answering true for toplevel types |
| if ((currentType.modifiers & ClassFileConstants.AccStatic) != 0) break checkParameterizedAllocation; |
| if (currentType.isRawType()) break checkParameterizedAllocation; |
| } while ((currentType = currentType.enclosingType())!= null); |
| ParameterizedQualifiedTypeReference qRef = (ParameterizedQualifiedTypeReference) this.type; |
| for (int i = qRef.typeArguments.length - 2; i >= 0; i--) { |
| if (qRef.typeArguments[i] != null) { |
| scope.problemReporter().illegalQualifiedParameterizedTypeAllocation(this.type, receiverType); |
| break; |
| } |
| } |
| } |
| } |
| if (receiverType == null || !receiverType.isValidBinding()) { |
| hasError = true; |
| } |
| |
| // limit of fault-tolerance |
| if (hasError) { |
| if (receiverType instanceof ReferenceBinding) { |
| ReferenceBinding referenceReceiver = (ReferenceBinding) receiverType; |
| if (receiverType.isValidBinding()) { |
| // record a best guess, for clients who need hint about possible contructor match |
| int length = this.arguments == null ? 0 : this.arguments.length; |
| TypeBinding[] pseudoArgs = new TypeBinding[length]; |
| for (int i = length; --i >= 0;) { |
| pseudoArgs[i] = argumentTypes[i] == null ? TypeBinding.NULL : argumentTypes[i]; // replace args with errors with null type |
| } |
| this.binding = scope.findMethod(referenceReceiver, TypeConstants.INIT, pseudoArgs, this); |
| if (this.binding != null && !this.binding.isValidBinding()) { |
| MethodBinding closestMatch = ((ProblemMethodBinding)this.binding).closestMatch; |
| // record the closest match, for clients who may still need hint about possible method match |
| if (closestMatch != null) { |
| if (closestMatch.original().typeVariables != Binding.NO_TYPE_VARIABLES) { // generic method |
| // shouldn't return generic method outside its context, rather convert it to raw method (175409) |
| closestMatch = scope.environment().createParameterizedGenericMethod(closestMatch.original(), (RawTypeBinding)null); |
| } |
| this.binding = closestMatch; |
| MethodBinding closestMatchOriginal = closestMatch.original(); |
| if (closestMatchOriginal.isOrEnclosedByPrivateType() && !scope.isDefinedInMethod(closestMatchOriginal)) { |
| // ignore cases where method is used from within inside itself (e.g. direct recursions) |
| closestMatchOriginal.modifiers |= ExtraCompilerModifiers.AccLocallyUsed; |
| } |
| } |
| } |
| } |
| if (this.anonymousType != null) { |
| // insert anonymous type in scope (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=210070) |
| scope.addAnonymousType(this.anonymousType, referenceReceiver); |
| this.anonymousType.resolve(scope); |
| return this.resolvedType = this.anonymousType.binding; |
| } |
| } |
| return this.resolvedType = receiverType; |
| } |
| if (this.anonymousType == null) { |
| // qualified allocation with no anonymous type |
| if (!receiverType.canBeInstantiated()) { |
| scope.problemReporter().cannotInstantiate(this.type, receiverType); |
| return this.resolvedType = receiverType; |
| } |
| ReferenceBinding allocationType = (ReferenceBinding) receiverType; |
| if ((this.binding = scope.getConstructor(allocationType, argumentTypes, this)).isValidBinding()) { |
| if (isMethodUseDeprecated(this.binding, scope, true)) { |
| scope.problemReporter().deprecatedMethod(this.binding, this); |
| } |
| if (checkInvocationArguments(scope, null, allocationType, this.binding, this.arguments, argumentTypes, argsContainCast, this)) { |
| this.bits |= ASTNode.Unchecked; |
| } |
| if (this.typeArguments != null && this.binding.original().typeVariables == Binding.NO_TYPE_VARIABLES) { |
| scope.problemReporter().unnecessaryTypeArgumentsForMethodInvocation(this.binding, this.genericTypeArguments, this.typeArguments); |
| } |
| } else { |
| if (this.binding.declaringClass == null) { |
| this.binding.declaringClass = allocationType; |
| } |
| if (this.type != null && !this.type.resolvedType.isValidBinding()) { |
| // problem already got signaled on type reference, do not report secondary problem |
| return null; |
| } |
| scope.problemReporter().invalidConstructor(this, this.binding); |
| return this.resolvedType = receiverType; |
| } |
| if ((this.binding.tagBits & TagBits.HasMissingType) != 0) { |
| scope.problemReporter().missingTypeInConstructor(this, this.binding); |
| } |
| // The enclosing instance must be compatible with the innermost enclosing type |
| ReferenceBinding expectedType = this.binding.declaringClass.enclosingType(); |
| if (expectedType != enclosingInstanceType) // must call before computeConversion() and typeMismatchError() |
| scope.compilationUnitScope().recordTypeConversion(expectedType, enclosingInstanceType); |
| if (enclosingInstanceType.isCompatibleWith(expectedType) || scope.isBoxingCompatibleWith(enclosingInstanceType, expectedType)) { |
| this.enclosingInstance.computeConversion(scope, expectedType, enclosingInstanceType); |
| return this.resolvedType = receiverType; |
| } |
| scope.problemReporter().typeMismatchError(enclosingInstanceType, expectedType, this.enclosingInstance, null); |
| return this.resolvedType = receiverType; |
| } |
| ReferenceBinding superType = (ReferenceBinding) receiverType; |
| if (superType.isTypeVariable()) { |
| superType = new ProblemReferenceBinding(new char[][]{superType.sourceName()}, superType, ProblemReasons.IllegalSuperTypeVariable); |
| scope.problemReporter().invalidType(this, superType); |
| return null; |
| } else if (this.type != null && superType.isEnum()) { // tolerate enum constant body |
| scope.problemReporter().cannotInstantiate(this.type, superType); |
| return this.resolvedType = superType; |
| } |
| // anonymous type scenario |
| // an anonymous class inherits from java.lang.Object when declared "after" an interface |
| ReferenceBinding anonymousSuperclass = superType.isInterface() ? scope.getJavaLangObject() : superType; |
| // insert anonymous type in scope |
| scope.addAnonymousType(this.anonymousType, superType); |
| this.anonymousType.resolve(scope); |
| |
| // find anonymous super constructor |
| this.resolvedType = this.anonymousType.binding; // 1.2 change |
| if ((this.resolvedType.tagBits & TagBits.HierarchyHasProblems) != 0) { |
| return null; // stop secondary errors |
| } |
| MethodBinding inheritedBinding = scope.getConstructor(anonymousSuperclass, argumentTypes, this); |
| if (!inheritedBinding.isValidBinding()) { |
| if (inheritedBinding.declaringClass == null) { |
| inheritedBinding.declaringClass = anonymousSuperclass; |
| } |
| if (this.type != null && !this.type.resolvedType.isValidBinding()) { |
| // problem already got signaled on type reference, do not report secondary problem |
| return null; |
| } |
| scope.problemReporter().invalidConstructor(this, inheritedBinding); |
| return this.resolvedType; |
| } |
| if ((inheritedBinding.tagBits & TagBits.HasMissingType) != 0) { |
| scope.problemReporter().missingTypeInConstructor(this, inheritedBinding); |
| } |
| if (this.enclosingInstance != null) { |
| ReferenceBinding targetEnclosing = inheritedBinding.declaringClass.enclosingType(); |
| if (targetEnclosing == null) { |
| scope.problemReporter().unnecessaryEnclosingInstanceSpecification(this.enclosingInstance, superType); |
| return this.resolvedType; |
| } else if (!enclosingInstanceType.isCompatibleWith(targetEnclosing) && !scope.isBoxingCompatibleWith(enclosingInstanceType, targetEnclosing)) { |
| scope.problemReporter().typeMismatchError(enclosingInstanceType, targetEnclosing, this.enclosingInstance, null); |
| return this.resolvedType; |
| } |
| this.enclosingInstance.computeConversion(scope, targetEnclosing, enclosingInstanceType); |
| } |
| if (this.arguments != null) { |
| if (checkInvocationArguments(scope, null, anonymousSuperclass, inheritedBinding, this.arguments, argumentTypes, argsContainCast, this)) { |
| this.bits |= ASTNode.Unchecked; |
| } |
| } |
| if (this.typeArguments != null && inheritedBinding.original().typeVariables == Binding.NO_TYPE_VARIABLES) { |
| scope.problemReporter().unnecessaryTypeArgumentsForMethodInvocation(inheritedBinding, this.genericTypeArguments, this.typeArguments); |
| } |
| // Update the anonymous inner class : superclass, interface |
| this.binding = this.anonymousType.createDefaultConstructorWithBinding(inheritedBinding, (this.bits & ASTNode.Unchecked) != 0 && this.genericTypeArguments == null); |
| return this.resolvedType; |
| } |
| |
| public void traverse(ASTVisitor visitor, BlockScope scope) { |
| if (visitor.visit(this, scope)) { |
| if (this.enclosingInstance != null) |
| this.enclosingInstance.traverse(visitor, scope); |
| if (this.typeArguments != null) { |
| for (int i = 0, typeArgumentsLength = this.typeArguments.length; i < typeArgumentsLength; i++) { |
| this.typeArguments[i].traverse(visitor, scope); |
| } |
| } |
| if (this.type != null) // case of enum constant |
| this.type.traverse(visitor, scope); |
| if (this.arguments != null) { |
| int argumentsLength = this.arguments.length; |
| for (int i = 0; i < argumentsLength; i++) |
| this.arguments[i].traverse(visitor, scope); |
| } |
| if (this.anonymousType != null) |
| this.anonymousType.traverse(visitor, scope); |
| } |
| visitor.endVisit(this, scope); |
| } |
| } |
