| /******************************************************************************* |
| * 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 - Contributions for |
| * bug 236385 - [compiler] Warn for potential programming problem if an object is created but not used |
| * 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.*; |
| import org.eclipse.jdt.internal.compiler.flow.*; |
| import org.eclipse.jdt.internal.compiler.impl.Constant; |
| import org.eclipse.jdt.internal.compiler.lookup.*; |
| |
| public class AllocationExpression extends Expression implements InvocationSite { |
| |
| public TypeReference type; |
| public Expression[] arguments; |
| public MethodBinding binding; // exact binding resulting from lookup |
| MethodBinding syntheticAccessor; // synthetic accessor for inner-emulation |
| public TypeReference[] typeArguments; |
| public TypeBinding[] genericTypeArguments; |
| public FieldDeclaration enumConstant; // for enum constant initializations |
| private TypeBinding expectedTypeForInference; // for <> inference |
| |
| public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) { |
| // check captured variables are initialized in current context (26134) |
| checkCapturedLocalInitializationIfNecessary((ReferenceBinding)this.binding.declaringClass.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) |
| .unconditionalInits(); |
| if ((this.arguments[i].implicitConversion & TypeIds.UNBOXING) != 0) { |
| this.arguments[i].checkNPE(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); |
| } |
| if (this.binding.declaringClass.isMemberType() && !this.binding.declaringClass.isStatic()) { |
| // allocating a non-static member type without an enclosing instance of parent type |
| // https://bugs.eclipse.org/bugs/show_bug.cgi?id=335845 |
| currentScope.resetEnclosingMethodStaticFlag(); |
| } |
| manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo); |
| manageSyntheticAccessIfNecessary(currentScope, flowInfo); |
| |
| return flowInfo; |
| } |
| |
| public void checkCapturedLocalInitializationIfNecessary(ReferenceBinding checkedType, BlockScope currentScope, FlowInfo flowInfo) { |
| if (((checkedType.tagBits & ( TagBits.AnonymousTypeMask|TagBits.LocalTypeMask)) == TagBits.LocalTypeMask) |
| && !currentScope.isDefinedInType(checkedType)) { // only check external allocations |
| NestedTypeBinding nestedType = (NestedTypeBinding) checkedType; |
| SyntheticArgumentBinding[] syntheticArguments = nestedType.syntheticOuterLocalVariables(); |
| if (syntheticArguments != null) |
| for (int i = 0, count = syntheticArguments.length; i < count; i++){ |
| SyntheticArgumentBinding syntheticArgument = syntheticArguments[i]; |
| LocalVariableBinding targetLocal; |
| if ((targetLocal = syntheticArgument.actualOuterLocalVariable) == null) continue; |
| if (targetLocal.declaration != null && !flowInfo.isDefinitelyAssigned(targetLocal)){ |
| currentScope.problemReporter().uninitializedLocalVariable(targetLocal, this); |
| } |
| } |
| } |
| } |
| |
| public Expression enclosingInstance() { |
| return null; |
| } |
| |
| 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); |
| } |
| |
| /** |
| * @see org.eclipse.jdt.internal.compiler.lookup.InvocationSite#genericTypeArguments() |
| */ |
| public TypeBinding[] genericTypeArguments() { |
| return this.genericTypeArguments; |
| } |
| |
| public boolean isSuperAccess() { |
| return false; |
| } |
| |
| 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. |
| */ |
| public void manageEnclosingInstanceAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) { |
| if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) != 0) return; |
| ReferenceBinding allocatedTypeErasure = (ReferenceBinding) this.binding.declaringClass.erasure(); |
| |
| // perform some 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, false); |
| // request cascade of accesses |
| } else { |
| // locally propagate, since we already now the desired shape for sure |
| currentScope.propagateInnerEmulation(allocatedTypeErasure, false); |
| // request cascade of accesses |
| } |
| } |
| } |
| |
| public void manageSyntheticAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) { |
| if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) != 0) return; |
| // if constructor from parameterized type got found, use the original constructor at codegen time |
| MethodBinding codegenBinding = this.binding.original(); |
| |
| ReferenceBinding declaringClass; |
| if (codegenBinding.isPrivate() && currentScope.enclosingSourceType() != (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 printExpression(int indent, StringBuffer output) { |
| if (this.type != null) { // type null for enum constant initializations |
| output.append("new "); //$NON-NLS-1$ |
| } |
| 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.type != null) { // type null for enum constant initializations |
| this.type.printExpression(0, output); |
| } |
| output.append('('); |
| 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(')'); |
| } |
| |
| public TypeBinding resolveType(BlockScope scope) { |
| // Propagate the type checking to the arguments, and check if the constructor is defined. |
| this.constant = Constant.NotAConstant; |
| if (this.type == null) { |
| // initialization of an enum constant |
| this.resolvedType = scope.enclosingReceiverType(); |
| } else { |
| if ((this.type.bits & ASTNode.IsDiamond) != 0) { |
| this.resolvedType = null; // can be done only after type arguments and method arguments resolution. |
| } else { |
| this.resolvedType = this.type.resolveType(scope, true /* check bounds*/); |
| } |
| // check for parameterized allocation deferred to below. |
| } |
| // will check for null after args are resolved |
| |
| // 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; |
| } |
| } |
| |
| // buffering the arguments' types |
| boolean argsContainCast = false; |
| TypeBinding[] argumentTypes = Binding.NO_PARAMETERS; |
| if (this.arguments != null) { |
| boolean argHasError = false; |
| 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 |= DisableUnnecessaryCastCheck; // will check later on |
| argsContainCast = true; |
| } |
| if ((argumentTypes[i] = argument.resolveType(scope)) == null) { |
| argHasError = true; |
| } |
| } |
| if (argHasError) { |
| if (this.resolvedType instanceof ReferenceBinding) { |
| // 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((ReferenceBinding) this.resolvedType, 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 this.resolvedType; |
| } |
| } |
| if (this.type != null && (this.type.bits & ASTNode.IsDiamond) != 0) { |
| // Perform diamond inference here. (Not done yet.) |
| this.resolvedType = this.type.resolveType(scope, true /* check bounds*/); // for now just do what we do for 1.6- |
| } |
| checkParameterizedAllocation: { |
| if (this.type instanceof ParameterizedQualifiedTypeReference) { // disallow new X<String>.Y<Integer>() |
| ReferenceBinding currentType = (ReferenceBinding)this.resolvedType; |
| if (currentType == null) return currentType; |
| 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, this.resolvedType); |
| break; |
| } |
| } |
| } |
| } |
| if (this.resolvedType == null || !this.resolvedType.isValidBinding()) { |
| return null; |
| } |
| |
| // null type denotes fake allocation for enum constant inits |
| if (this.type != null && !this.resolvedType.canBeInstantiated()) { |
| scope.problemReporter().cannotInstantiate(this.type, this.resolvedType); |
| return this.resolvedType; |
| } |
| ReferenceBinding allocationType = (ReferenceBinding) this.resolvedType; |
| if (!(this.binding = scope.getConstructor(allocationType, argumentTypes, this)).isValidBinding()) { |
| if (this.binding.declaringClass == null) { |
| this.binding.declaringClass = allocationType; |
| } |
| if (this.type != null && !this.type.resolvedType.isValidBinding()) { |
| return null; |
| } |
| scope.problemReporter().invalidConstructor(this, this.binding); |
| return this.resolvedType; |
| } |
| if ((this.binding.tagBits & TagBits.HasMissingType) != 0) { |
| scope.problemReporter().missingTypeInConstructor(this, this.binding); |
| } |
| 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); |
| } |
| return allocationType; |
| } |
| |
| public void setActualReceiverType(ReferenceBinding receiverType) { |
| // ignored |
| } |
| |
| public void setDepth(int i) { |
| // ignored |
| } |
| |
| public void setFieldIndex(int i) { |
| // ignored |
| } |
| |
| public void traverse(ASTVisitor visitor, BlockScope scope) { |
| if (visitor.visit(this, 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) { // enum constant scenario |
| this.type.traverse(visitor, scope); |
| } |
| if (this.arguments != null) { |
| for (int i = 0, argumentsLength = this.arguments.length; i < argumentsLength; i++) |
| this.arguments[i].traverse(visitor, scope); |
| } |
| } |
| visitor.endVisit(this, scope); |
| } |
| /** |
| * @see org.eclipse.jdt.internal.compiler.ast.Expression#setExpectedType(org.eclipse.jdt.internal.compiler.lookup.TypeBinding) |
| */ |
| public void setExpectedType(TypeBinding expectedType) { |
| this.expectedTypeForInference = expectedType; |
| } |
| /** |
| * @see org.eclipse.jdt.internal.compiler.lookup.InvocationSite#expectedType() |
| */ |
| public TypeBinding expectedType() { |
| return this.expectedTypeForInference; |
| } |
| |
| } |