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Java > Open Source Codes > org > eclipse > jdt > internal > compiler > ast > AllocationExpression


1 /*******************************************************************************
2  * Copyright (c) 2000, 2007 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  *******************************************************************************/
11 package org.eclipse.jdt.internal.compiler.ast;
12
13 import org.eclipse.jdt.internal.compiler.ASTVisitor;
14 import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
15 import org.eclipse.jdt.internal.compiler.codegen.*;
16 import org.eclipse.jdt.internal.compiler.flow.*;
17 import org.eclipse.jdt.internal.compiler.impl.Constant;
18 import org.eclipse.jdt.internal.compiler.lookup.*;
19
20 public class AllocationExpression extends Expression implements InvocationSite {
21         
22     public TypeReference type;
23     public Expression[] arguments;
24     public MethodBinding binding; // exact binding resulting from lookup
25 protected MethodBinding codegenBinding; // actual binding used for code generation (if no synthetic accessor)
26 MethodBinding syntheticAccessor; // synthetic accessor for inner-emulation
27 public TypeReference[] typeArguments;
28     public TypeBinding[] genericTypeArguments;
29     public FieldDeclaration enumConstant; // for enum constant initializations
30
31 public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
32     // check captured variables are initialized in current context (26134)
33 checkCapturedLocalInitializationIfNecessary((ReferenceBinding)this.binding.declaringClass.erasure(), currentScope, flowInfo);
34
35     // process arguments
36 if (arguments != null) {
37         for (int i = 0, count = arguments.length; i < count; i++) {
38             flowInfo =
39                 arguments[i]
40                     .analyseCode(currentScope, flowContext, flowInfo)
41                     .unconditionalInits();
42         }
43     }
44     // record some dependency information for exception types
45 ReferenceBinding[] thrownExceptions;
46     if (((thrownExceptions = this.binding.thrownExceptions).length) != 0) {
47         // check exception handling
48 flowContext.checkExceptionHandlers(
49             thrownExceptions,
50             this,
51             flowInfo.unconditionalCopy(),
52             currentScope);
53     }
54     manageEnclosingInstanceAccessIfNecessary(currentScope, flowInfo);
55     manageSyntheticAccessIfNecessary(currentScope, flowInfo);
56     
57     return flowInfo;
58 }
59
60 public void checkCapturedLocalInitializationIfNecessary(ReferenceBinding checkedType, BlockScope currentScope, FlowInfo flowInfo) {
61     if (checkedType.isLocalType()
62             && !checkedType.isAnonymousType()
63             && !currentScope.isDefinedInType(checkedType)) { // only check external allocations
64 NestedTypeBinding nestedType = (NestedTypeBinding) checkedType;
65         SyntheticArgumentBinding[] syntheticArguments = nestedType.syntheticOuterLocalVariables();
66         if (syntheticArguments != null)
67             for (int i = 0, count = syntheticArguments.length; i < count; i++){
68                 SyntheticArgumentBinding syntheticArgument = syntheticArguments[i];
69                 LocalVariableBinding targetLocal;
70                 if ((targetLocal = syntheticArgument.actualOuterLocalVariable) == null) continue;
71                 if (targetLocal.declaration != null && !flowInfo.isDefinitelyAssigned(targetLocal)){
72                     currentScope.problemReporter().uninitializedLocalVariable(targetLocal, this);
73                 }
74             }
75     }
76 }
77
78 public Expression enclosingInstance() {
79     return null;
80 }
81
82 public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
83     int pc = codeStream.position;
84     ReferenceBinding allocatedType = this.codegenBinding.declaringClass;
85
86     codeStream.new_(allocatedType);
87     boolean isUnboxing = (this.implicitConversion & TypeIds.UNBOXING) != 0;
88     if (valueRequired || isUnboxing) {
89         codeStream.dup();
90     }
91     // better highlight for allocation: display the type individually
92 if (this.type != null) { // null for enum constant body
93 codeStream.recordPositionsFrom(pc, this.type.sourceStart);
94     } else {
95         // push enum constant name and ordinal
96 codeStream.ldc(String.valueOf(enumConstant.name));
97         codeStream.generateInlinedValue(enumConstant.binding.id);
98     }
99
100     // handling innerclass instance allocation - enclosing instance arguments
101 if (allocatedType.isNestedType()) {
102         codeStream.generateSyntheticEnclosingInstanceValues(
103             currentScope,
104             allocatedType,
105             enclosingInstance(),
106             this);
107     }
108     // generate the arguments for constructor
109 generateArguments(binding, arguments, currentScope, codeStream);
110     // handling innerclass instance allocation - outer local arguments
111 if (allocatedType.isNestedType()) {
112         codeStream.generateSyntheticOuterArgumentValues(
113             currentScope,
114             allocatedType,
115             this);
116     }
117     // invoke constructor
118 if (syntheticAccessor == null) {
119         codeStream.invokespecial(this.codegenBinding);
120     } else {
121         // synthetic accessor got some extra arguments appended to its signature, which need values
122 for (int i = 0,
123             max = syntheticAccessor.parameters.length - this.codegenBinding.parameters.length;
124             i < max;
125             i++) {
126             codeStream.aconst_null();
127         }
128         codeStream.invokespecial(syntheticAccessor);
129     }
130     if (valueRequired) {
131         codeStream.generateImplicitConversion(this.implicitConversion);
132     } else if (isUnboxing) {
133         // conversion only generated if unboxing
134 codeStream.generateImplicitConversion(this.implicitConversion);
135         switch (postConversionType(currentScope).id) {
136             case T_long :
137             case T_double :
138                 codeStream.pop2();
139                 break;
140             default :
141                 codeStream.pop();
142         }
143     }
144     codeStream.recordPositionsFrom(pc, this.sourceStart);
145 }
146
147 /**
148  * @see org.eclipse.jdt.internal.compiler.lookup.InvocationSite#genericTypeArguments()
149  */
150 public TypeBinding[] genericTypeArguments() {
151     return this.genericTypeArguments;
152 }
153
154 public boolean isSuperAccess() {
155     return false;
156 }
157
158 public boolean isTypeAccess() {
159     return true;
160 }
161
162 /* Inner emulation consists in either recording a dependency
163  * link only, or performing one level of propagation.
164  *
165  * Dependency mechanism is used whenever dealing with source target
166  * types, since by the time we reach them, we might not yet know their
167  * exact need.
168  */
169 public void manageEnclosingInstanceAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) {
170     if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) != 0) return;
171     ReferenceBinding allocatedTypeErasure = (ReferenceBinding) binding.declaringClass.erasure();
172
173     // perform some emulation work in case there is some and we are inside a local type only
174 if (allocatedTypeErasure.isNestedType()
175         && currentScope.enclosingSourceType().isLocalType()) {
176
177         if (allocatedTypeErasure.isLocalType()) {
178             ((LocalTypeBinding) allocatedTypeErasure).addInnerEmulationDependent(currentScope, false);
179             // request cascade of accesses
180 } else {
181             // locally propagate, since we already now the desired shape for sure
182 currentScope.propagateInnerEmulation(allocatedTypeErasure, false);
183             // request cascade of accesses
184 }
185     }
186 }
187
188 public void manageSyntheticAccessIfNecessary(BlockScope currentScope, FlowInfo flowInfo) {
189     if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) != 0) return;
190     // if constructor from parameterized type got found, use the original constructor at codegen time
191 this.codegenBinding = this.binding.original();
192
193     ReferenceBinding declaringClass;
194     if (this.codegenBinding.isPrivate() && currentScope.enclosingSourceType() != (declaringClass = this.codegenBinding.declaringClass)) {
195
196         // from 1.4 on, local type constructor can lose their private flag to ease emulation
197 if ((declaringClass.tagBits & TagBits.IsLocalType) != 0 && currentScope.compilerOptions().complianceLevel >= ClassFileConstants.JDK1_4) {
198             // constructor will not be dumped as private, no emulation required thus
199 this.codegenBinding.tagBits |= TagBits.ClearPrivateModifier;
200         } else {
201             syntheticAccessor = ((SourceTypeBinding) declaringClass).addSyntheticMethod(this.codegenBinding, isSuperAccess());
202             currentScope.problemReporter().needToEmulateMethodAccess(this.codegenBinding, this);
203         }
204     }
205 }
206
207 public StringBuffer JavaDoc printExpression(int indent, StringBuffer JavaDoc output) {
208     if (this.type != null) { // type null for enum constant initializations
209 output.append("new "); //$NON-NLS-1$
210 }
211     if (typeArguments != null) {
212         output.append('<');
213         int max = typeArguments.length - 1;
214         for (int j = 0; j < max; j++) {
215             typeArguments[j].print(0, output);
216             output.append(", ");//$NON-NLS-1$
217 }
218         typeArguments[max].print(0, output);
219         output.append('>');
220     }
221     if (type != null) { // type null for enum constant initializations
222 type.printExpression(0, output);
223     }
224     output.append('(');
225     if (arguments != null) {
226         for (int i = 0; i < arguments.length; i++) {
227             if (i > 0) output.append(", "); //$NON-NLS-1$
228 arguments[i].printExpression(0, output);
229         }
230     }
231     return output.append(')');
232 }
233
234 public TypeBinding resolveType(BlockScope scope) {
235     // Propagate the type checking to the arguments, and check if the constructor is defined.
236 constant = Constant.NotAConstant;
237     if (this.type == null) {
238         // initialization of an enum constant
239 this.resolvedType = scope.enclosingReceiverType();
240     } else {
241         this.resolvedType = this.type.resolveType(scope, true /* check bounds*/);
242         checkParameterizedAllocation: {
243             if (this.type instanceof ParameterizedQualifiedTypeReference) { // disallow new X<String>.Y<Integer>()
244 ReferenceBinding currentType = (ReferenceBinding)this.resolvedType;
245                 if (currentType == null) return null;
246                 do {
247                     // isStatic() is answering true for toplevel types
248 if ((currentType.modifiers & ClassFileConstants.AccStatic) != 0) break checkParameterizedAllocation;
249                     if (currentType.isRawType()) break checkParameterizedAllocation;
250                 } while ((currentType = currentType.enclosingType())!= null);
251                 ParameterizedQualifiedTypeReference qRef = (ParameterizedQualifiedTypeReference) this.type;
252                 for (int i = qRef.typeArguments.length - 2; i >= 0; i--) {
253                     if (qRef.typeArguments[i] != null) {
254                         scope.problemReporter().illegalQualifiedParameterizedTypeAllocation(this.type, this.resolvedType);
255                         break;
256                     }
257                 }
258             }
259         }
260     }
261     // will check for null after args are resolved
262
263     // resolve type arguments (for generic constructor call)
264 if (this.typeArguments != null) {
265         int length = this.typeArguments.length;
266         boolean argHasError = false; // typeChecks all arguments
267 this.genericTypeArguments = new TypeBinding[length];
268         for (int i = 0; i < length; i++) {
269             TypeReference typeReference = this.typeArguments[i];
270             if ((this.genericTypeArguments[i] = typeReference.resolveType(scope, true /* check bounds*/)) == null) {
271                 argHasError = true;
272             }
273             if (argHasError && typeReference instanceof Wildcard) {
274                 scope.problemReporter().illegalUsageOfWildcard(typeReference);
275             }
276         }
277         if (argHasError) {
278             return null;
279         }
280     }
281     
282     // buffering the arguments' types
283 boolean argsContainCast = false;
284     TypeBinding[] argumentTypes = Binding.NO_PARAMETERS;
285     if (arguments != null) {
286         boolean argHasError = false;
287         int length = arguments.length;
288         argumentTypes = new TypeBinding[length];
289         for (int i = 0; i < length; i++) {
290             Expression argument = this.arguments[i];
291             if (argument instanceof CastExpression) {
292                 argument.bits |= DisableUnnecessaryCastCheck; // will check later on
293 argsContainCast = true;
294             }
295             if ((argumentTypes[i] = argument.resolveType(scope)) == null) {
296                 argHasError = true;
297             }
298         }
299         if (argHasError) {
300             if (this.resolvedType instanceof ReferenceBinding) {
301                 // record a best guess, for clients who need hint about possible contructor match
302 TypeBinding[] pseudoArgs = new TypeBinding[length];
303                 for (int i = length; --i >= 0;) {
304                     pseudoArgs[i] = argumentTypes[i] == null ? TypeBinding.NULL : argumentTypes[i]; // replace args with errors with null type
305 }
306                 this.binding = scope.findMethod((ReferenceBinding) this.resolvedType, TypeConstants.INIT, pseudoArgs, this);
307                 if (this.binding != null && !this.binding.isValidBinding()) {
308                     MethodBinding closestMatch = ((ProblemMethodBinding)this.binding).closestMatch;
309                     // record the closest match, for clients who may still need hint about possible method match
310 if (closestMatch != null) {
311                         if (closestMatch.original().typeVariables != Binding.NO_TYPE_VARIABLES) { // generic method
312 // shouldn't return generic method outside its context, rather convert it to raw method (175409)
313 closestMatch = scope.environment().createParameterizedGenericMethod(closestMatch.original(), (RawTypeBinding)null);
314                         }
315                         this.binding = closestMatch;
316                         MethodBinding closestMatchOriginal = closestMatch.original();
317                         if ((closestMatchOriginal.isPrivate() || closestMatchOriginal.declaringClass.isLocalType()) && !scope.isDefinedInMethod(closestMatchOriginal)) {
318                             // ignore cases where method is used from within inside itself (e.g. direct recursions)
319 closestMatchOriginal.modifiers |= ExtraCompilerModifiers.AccLocallyUsed;
320                         }
321                     }
322                 }
323             }
324             return this.resolvedType;
325         }
326     }
327     if (this.resolvedType == null)
328         return null;
329
330     // null type denotes fake allocation for enum constant inits
331 if (this.type != null && !this.resolvedType.canBeInstantiated()) {
332         scope.problemReporter().cannotInstantiate(type, this.resolvedType);
333         return this.resolvedType;
334     }
335     ReferenceBinding allocationType = (ReferenceBinding) this.resolvedType;
336     if (!(binding = scope.getConstructor(allocationType, argumentTypes, this)).isValidBinding()) {
337         if (binding.declaringClass == null)
338             binding.declaringClass = allocationType;
339         scope.problemReporter().invalidConstructor(this, binding);
340         return this.resolvedType;
341     }
342     if (isMethodUseDeprecated(binding, scope, true))
343         scope.problemReporter().deprecatedMethod(binding, this);
344     checkInvocationArguments(scope, null, allocationType, this.binding, this.arguments, argumentTypes, argsContainCast, this);
345
346     return allocationType;
347 }
348
349 public void setActualReceiverType(ReferenceBinding receiverType) {
350     // ignored
351 }
352
353 public void setDepth(int i) {
354     // ignored
355 }
356
357 public void setFieldIndex(int i) {
358     // ignored
359 }
360
361 public void traverse(ASTVisitor visitor, BlockScope scope) {
362     if (visitor.visit(this, scope)) {
363         if (this.typeArguments != null) {
364             for (int i = 0, typeArgumentsLength = this.typeArguments.length; i < typeArgumentsLength; i++) {
365                 this.typeArguments[i].traverse(visitor, scope);
366             }
367         }
368         if (this.type != null) { // enum constant scenario
369 this.type.traverse(visitor, scope);
370         }
371         if (this.arguments != null) {
372             for (int i = 0, argumentsLength = this.arguments.length; i < argumentsLength; i++)
373                 this.arguments[i].traverse(visitor, scope);
374         }
375     }
376     visitor.endVisit(this, scope);
377 }
378 }
379
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