| /******************************************************************************* |
| * 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 |
| * |
| * 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.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.InvocationSite; |
| import org.eclipse.jdt.internal.compiler.lookup.LocalTypeBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.MethodBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.MethodScope; |
| import org.eclipse.jdt.internal.compiler.lookup.ProblemMethodBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.RawTypeBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding; |
| import org.eclipse.jdt.internal.compiler.lookup.SourceTypeBinding; |
| 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; |
| import org.eclipse.jdt.internal.compiler.lookup.VariableBinding; |
| |
| public class ExplicitConstructorCall extends Statement implements InvocationSite { |
| |
| public Expression[] arguments; |
| public Expression qualification; |
| public MethodBinding binding; // exact binding resulting from lookup |
| MethodBinding syntheticAccessor; // synthetic accessor for inner-emulation |
| public int accessMode; |
| public TypeReference[] typeArguments; |
| public TypeBinding[] genericTypeArguments; |
| |
| public final static int ImplicitSuper = 1; |
| public final static int Super = 2; |
| public final static int This = 3; |
| |
| public VariableBinding[][] implicitArguments; |
| |
| // TODO Remove once DOMParser is activated |
| public int typeArgumentsSourceStart; |
| |
| public ExplicitConstructorCall(int accessMode) { |
| this.accessMode = accessMode; |
| } |
| |
| public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) { |
| // must verify that exceptions potentially thrown by this expression are caught in the method. |
| |
| try { |
| ((MethodScope) currentScope).isConstructorCall = true; |
| |
| // process enclosing instance |
| if (this.qualification != null) { |
| flowInfo = |
| this.qualification |
| .analyseCode(currentScope, flowContext, flowInfo) |
| .unconditionalInits(); |
| } |
| // process arguments |
| if (this.arguments != null) { |
| for (int i = 0, max = this.arguments.length; i < max; i++) { |
| flowInfo = |
| this.arguments[i] |
| .analyseCode(currentScope, flowContext, flowInfo) |
| .unconditionalInits(); |
| if ((this.arguments[i].implicitConversion & TypeIds.UNBOXING) != 0) { |
| this.arguments[i].checkNPE(currentScope, flowContext, flowInfo); |
| } |
| } |
| } |
| |
| ReferenceBinding[] thrownExceptions; |
| if ((thrownExceptions = this.binding.thrownExceptions) != Binding.NO_EXCEPTIONS) { |
| 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 exceptions |
| flowContext.checkExceptionHandlers( |
| thrownExceptions, |
| (this.accessMode == ExplicitConstructorCall.ImplicitSuper) |
| ? (ASTNode) currentScope.methodScope().referenceContext |
| : (ASTNode) this, |
| flowInfo, |
| currentScope); |
| } |
| manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo); |
| manageSyntheticAccessIfNecessary(currentScope, flowInfo); |
| return flowInfo; |
| } finally { |
| ((MethodScope) currentScope).isConstructorCall = false; |
| } |
| } |
| |
| /** |
| * Constructor call code generation |
| * |
| * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope |
| * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream |
| */ |
| public void generateCode(BlockScope currentScope, CodeStream codeStream) { |
| if ((this.bits & ASTNode.IsReachable) == 0) { |
| return; |
| } |
| try { |
| ((MethodScope) currentScope).isConstructorCall = true; |
| |
| int pc = codeStream.position; |
| codeStream.aload_0(); |
| |
| MethodBinding codegenBinding = this.binding.original(); |
| ReferenceBinding targetType = codegenBinding.declaringClass; |
| |
| // special name&ordinal argument generation for enum constructors |
| if (targetType.erasure().id == TypeIds.T_JavaLangEnum || targetType.isEnum()) { |
| codeStream.aload_1(); // pass along name param as name arg |
| codeStream.iload_2(); // pass along ordinal param as ordinal arg |
| } |
| // handling innerclass constructor invocation |
| // handling innerclass instance allocation - enclosing instance arguments |
| if (targetType.isNestedType()) { |
| codeStream.generateSyntheticEnclosingInstanceValues( |
| currentScope, |
| targetType, |
| (this.bits & ASTNode.DiscardEnclosingInstance) != 0 ? null : this.qualification, |
| this); |
| } |
| // generate arguments |
| generateArguments(this.binding, this.arguments, currentScope, codeStream); |
| |
| // handling innerclass instance allocation - outer local arguments |
| if (targetType.isNestedType()) { |
| codeStream.generateSyntheticOuterArgumentValues( |
| currentScope, |
| targetType, |
| this); |
| } |
| if (this.syntheticAccessor != null) { |
| // 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 */); |
| } else { |
| codeStream.invoke(Opcodes.OPC_invokespecial, codegenBinding, null /* default declaringClass */); |
| } |
| codeStream.recordPositionsFrom(pc, this.sourceStart); |
| } finally { |
| ((MethodScope) currentScope).isConstructorCall = false; |
| } |
| } |
| |
| /** |
| * @see org.eclipse.jdt.internal.compiler.lookup.InvocationSite#genericTypeArguments() |
| */ |
| public TypeBinding[] genericTypeArguments() { |
| return this.genericTypeArguments; |
| } |
| |
| public boolean isImplicitSuper() { |
| return (this.accessMode == ExplicitConstructorCall.ImplicitSuper); |
| } |
| |
| public boolean isSuperAccess() { |
| return this.accessMode != ExplicitConstructorCall.This; |
| } |
| |
| public boolean isTypeAccess() { |
| return true; |
| } |
| |
| /* 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. |
| */ |
| void manageEnclosingInstanceAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) { |
| ReferenceBinding superTypeErasure = (ReferenceBinding) this.binding.declaringClass.erasure(); |
| |
| if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) == 0) { |
| // perform some emulation work in case there is some and we are inside a local type only |
| if (superTypeErasure.isNestedType() |
| && currentScope.enclosingSourceType().isLocalType()) { |
| |
| if (superTypeErasure.isLocalType()) { |
| ((LocalTypeBinding) superTypeErasure).addInnerEmulationDependent(currentScope, this.qualification != null); |
| } else { |
| // locally propagate, since we already now the desired shape for sure |
| currentScope.propagateInnerEmulation(superTypeErasure, this.qualification != null); |
| } |
| } |
| } |
| } |
| |
| public void manageSyntheticAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) { |
| if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) == 0) { |
| // if constructor from parameterized type got found, use the original constructor at codegen time |
| MethodBinding codegenBinding = this.binding.original(); |
| |
| // perform some emulation work in case there is some and we are inside a local type only |
| if (this.binding.isPrivate() && this.accessMode != ExplicitConstructorCall.This) { |
| ReferenceBinding declaringClass = codegenBinding.declaringClass; |
| // from 1.4 on, local type constructor can lose their private flag to ease emulation |
| if ((declaringClass.tagBits & TagBits.IsLocalType) != 0 && currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4) { |
| // constructor will not be dumped as private, no emulation required thus |
| codegenBinding.tagBits |= TagBits.ClearPrivateModifier; |
| } else { |
| this.syntheticAccessor = ((SourceTypeBinding) declaringClass).addSyntheticMethod(codegenBinding, isSuperAccess()); |
| currentScope.problemReporter().needToEmulateMethodAccess(codegenBinding, this); |
| } |
| } |
| } |
| } |
| |
| public StringBuffer printStatement(int indent, StringBuffer output) { |
| printIndent(indent, output); |
| if (this.qualification != null) this.qualification.printExpression(0, output).append('.'); |
| if (this.typeArguments != null) { |
| output.append('<'); |
| int max = this.typeArguments.length - 1; |
| for (int j = 0; j < max; j++) { |
| this.typeArguments[j].print(0, output); |
| output.append(", ");//$NON-NLS-1$ |
| } |
| this.typeArguments[max].print(0, output); |
| output.append('>'); |
| } |
| if (this.accessMode == ExplicitConstructorCall.This) { |
| output.append("this("); //$NON-NLS-1$ |
| } else { |
| output.append("super("); //$NON-NLS-1$ |
| } |
| if (this.arguments != null) { |
| for (int i = 0; i < this.arguments.length; i++) { |
| if (i > 0) output.append(", "); //$NON-NLS-1$ |
| this.arguments[i].printExpression(0, output); |
| } |
| } |
| return output.append(");"); //$NON-NLS-1$ |
| } |
| |
| public void resolve(BlockScope scope) { |
| // the return type should be void for a constructor. |
| // the test is made into getConstructor |
| |
| // mark the fact that we are in a constructor call..... |
| // unmark at all returns |
| MethodScope methodScope = scope.methodScope(); |
| try { |
| AbstractMethodDeclaration methodDeclaration = methodScope.referenceMethod(); |
| if (methodDeclaration == null |
| || !methodDeclaration.isConstructor() |
| || ((ConstructorDeclaration) methodDeclaration).constructorCall != this) { |
| scope.problemReporter().invalidExplicitConstructorCall(this); |
| // fault-tolerance |
| if (this.qualification != null) { |
| this.qualification.resolveType(scope); |
| } |
| if (this.typeArguments != null) { |
| for (int i = 0, max = this.typeArguments.length; i < max; i++) { |
| this.typeArguments[i].resolveType(scope, true /* check bounds*/); |
| } |
| } |
| if (this.arguments != null) { |
| for (int i = 0, max = this.arguments.length; i < max; i++) { |
| this.arguments[i].resolveType(scope); |
| } |
| } |
| return; |
| } |
| methodScope.isConstructorCall = true; |
| ReferenceBinding receiverType = scope.enclosingReceiverType(); |
| boolean rcvHasError = false; |
| if (this.accessMode != ExplicitConstructorCall.This) { |
| receiverType = receiverType.superclass(); |
| TypeReference superclassRef = scope.referenceType().superclass; |
| if (superclassRef != null && superclassRef.resolvedType != null && !superclassRef.resolvedType.isValidBinding()) { |
| rcvHasError = true; |
| } |
| } |
| if (receiverType != null) { |
| // prevent (explicit) super constructor invocation from within enum |
| if (this.accessMode == ExplicitConstructorCall.Super && receiverType.erasure().id == TypeIds.T_JavaLangEnum) { |
| scope.problemReporter().cannotInvokeSuperConstructorInEnum(this, methodScope.referenceMethod().binding); |
| } |
| // qualification should be from the type of the enclosingType |
| if (this.qualification != null) { |
| if (this.accessMode != ExplicitConstructorCall.Super) { |
| scope.problemReporter().unnecessaryEnclosingInstanceSpecification( |
| this.qualification, |
| receiverType); |
| } |
| if (!rcvHasError) { |
| ReferenceBinding enclosingType = receiverType.enclosingType(); |
| if (enclosingType == null) { |
| scope.problemReporter().unnecessaryEnclosingInstanceSpecification(this.qualification, receiverType); |
| this.bits |= ASTNode.DiscardEnclosingInstance; |
| } else { |
| TypeBinding qTb = this.qualification.resolveTypeExpecting(scope, enclosingType); |
| this.qualification.computeConversion(scope, qTb, qTb); |
| } |
| } |
| } |
| } |
| // resolve type arguments (for generic constructor call) |
| if (this.typeArguments != null) { |
| boolean argHasError = scope.compilerOptions().sourceLevel < ClassFileConstants.JDK1_5; |
| int length = this.typeArguments.length; |
| 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; |
| } |
| } |
| // arguments buffering for the method lookup |
| TypeBinding[] argumentTypes = Binding.NO_PARAMETERS; |
| boolean argsContainCast = false; |
| if (this.arguments != null) { |
| boolean argHasError = false; // typeChecks all arguments |
| 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) { |
| argHasError = true; |
| } |
| } |
| if (argHasError) { |
| if (receiverType == null) { |
| return; |
| } |
| // record a best guess, for clients who need hint about possible contructor match |
| 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(receiverType, 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; |
| } |
| } |
| } |
| return; |
| } |
| } else if (receiverType.erasure().id == TypeIds.T_JavaLangEnum) { |
| // TODO (philippe) get rid of once well-known binding is available |
| argumentTypes = new TypeBinding[] { scope.getJavaLangString(), TypeBinding.INT }; |
| } |
| if (receiverType == null) { |
| return; |
| } |
| if ((this.binding = scope.getConstructor(receiverType, argumentTypes, this)).isValidBinding()) { |
| if ((this.binding.tagBits & TagBits.HasMissingType) != 0) { |
| if (!methodScope.enclosingSourceType().isAnonymousType()) { |
| scope.problemReporter().missingTypeInConstructor(this, this.binding); |
| } |
| } |
| if (isMethodUseDeprecated(this.binding, scope, this.accessMode != ExplicitConstructorCall.ImplicitSuper)) { |
| scope.problemReporter().deprecatedMethod(this.binding, this); |
| } |
| if (checkInvocationArguments(scope, null, receiverType, this.binding, this.arguments, argumentTypes, argsContainCast, this)) { |
| this.bits |= ASTNode.Unchecked; |
| } |
| if (this.binding.isOrEnclosedByPrivateType()) { |
| this.binding.original().modifiers |= ExtraCompilerModifiers.AccLocallyUsed; |
| } |
| 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 = receiverType; |
| } |
| if (rcvHasError) |
| return; |
| scope.problemReporter().invalidConstructor(this, this.binding); |
| } |
| } finally { |
| methodScope.isConstructorCall = false; |
| } |
| } |
| |
| public void setActualReceiverType(ReferenceBinding receiverType) { |
| // ignored |
| } |
| |
| public void setDepth(int depth) { |
| // ignore for here |
| } |
| |
| public void setFieldIndex(int depth) { |
| // ignore for here |
| } |
| |
| public void traverse(ASTVisitor visitor, BlockScope scope) { |
| if (visitor.visit(this, scope)) { |
| if (this.qualification != null) { |
| this.qualification.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.arguments != null) { |
| for (int i = 0, argumentLength = this.arguments.length; i < argumentLength; i++) |
| this.arguments[i].traverse(visitor, scope); |
| } |
| } |
| visitor.endVisit(this, scope); |
| } |
| } |
