/*******************************************************************************
* 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
* Stephan Herrmann - Contribution for bug 236385
*******************************************************************************/
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.InvocationSite;
import org.eclipse.jdt.internal.compiler.lookup.LocalTypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;
import org.eclipse.jdt.internal.compiler.lookup.MethodBinding;
import org.eclipse.jdt.internal.compiler.lookup.NestedTypeBinding;
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.SyntheticArgumentBinding;
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;
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
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();
}
}
// 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 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) != 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) != 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 {
this.resolvedType= this.type.resolveType(scope, true /* check bounds*/);
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;
}
}
}
}
}
// 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.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);
}
}