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/*******************************************************************************
* Copyright (c) 2000, 2015 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 - Contributions for
* bug 349326 - [1.7] new warning for missing try-with-resources
* bug 359334 - Analysis for resource leak warnings does not consider exceptions as method exit points
* bug 358903 - Filter practically unimportant resource leak warnings
* bug 368546 - [compiler][resource] Avoid remaining false positives found when compiling the Eclipse SDK
* bug 370639 - [compiler][resource] restore the default for resource leak warnings
* bug 388996 - [compiler][resource] Incorrect 'potential resource leak'
* bug 379784 - [compiler] "Method can be static" is not getting reported
* bug 394768 - [compiler][resource] Incorrect resource leak warning when creating stream in conditional
* bug 404649 - [1.8][compiler] detect illegal reference to indirect or redundant super
* Bug 429958 - [1.8][null] evaluate new DefaultLocation attribute of @NonNullByDefault
* Bug 371614 - [compiler][resource] Wrong "resource leak" problem on return/throw inside while loop
* Bug 421035 - [resource] False alarm of resource leak warning when casting a closeable in its assignment
* Bug 444964 - [1.7+][resource] False resource leak warning (try-with-resources for ByteArrayOutputStream - return inside for loop)
* Bug 396575 - [compiler][resources] Incorrect Errors/Warnings check for potential resource leak when surrounding with try-catch
* Jesper S Moller - Contributions for
* bug 378674 - "The method can be declared as static" is wrong
* Keigo Imai - Contribution for bug 388903 - Cannot extend inner class as an anonymous class when it extends the outer class
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.lookup;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.ast.*;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.codegen.CodeStream;
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.problem.ProblemReporter;
@SuppressWarnings({"rawtypes", "unchecked"})
public class BlockScope extends Scope {
// Local variable management
public LocalVariableBinding[] locals;
public int localIndex; // position for next variable
public int startIndex; // start position in this scope - for ordering scopes vs. variables
public int offset; // for variable allocation throughout scopes
public int maxOffset; // for variable allocation throughout scopes
// finally scopes must be shifted behind respective try&catch scope(s) so as to avoid
// collisions of secret variables (return address, save value).
public BlockScope[] shiftScopes;
public Scope[] subscopes = new Scope[1]; // need access from code assist
public int subscopeCount = 0; // need access from code assist
// record the current case statement being processed (for entire switch case block).
public CaseStatement enclosingCase; // from 1.4 on, local types should not be accessed across switch case blocks (52221)
public final static VariableBinding[] EmulationPathToImplicitThis = {};
public final static VariableBinding[] NoEnclosingInstanceInConstructorCall = {};
public final static VariableBinding[] NoEnclosingInstanceInStaticContext = {};
// annotation support
public boolean insideTypeAnnotation = false;
public BlockScope(BlockScope parent) {
this(parent, true);
}
public BlockScope(BlockScope parent, boolean addToParentScope) {
this(Scope.BLOCK_SCOPE, parent);
this.locals = new LocalVariableBinding[5];
if (addToParentScope) parent.addSubscope(this);
this.startIndex = parent.localIndex;
}
public BlockScope(BlockScope parent, int variableCount) {
this(Scope.BLOCK_SCOPE, parent);
this.locals = new LocalVariableBinding[variableCount];
parent.addSubscope(this);
this.startIndex = parent.localIndex;
}
protected BlockScope(int kind, Scope parent) {
super(kind, parent);
}
/* Create the class scope & binding for the anonymous type.
*/
public final void addAnonymousType(TypeDeclaration anonymousType, ReferenceBinding superBinding) {
ClassScope anonymousClassScope = new ClassScope(this, anonymousType);
anonymousClassScope.buildAnonymousTypeBinding(
enclosingSourceType(),
superBinding);
/* Tag any enclosing lambdas as instance capturing. Strictly speaking they need not be, unless the local/anonymous type references enclosing instance state.
but the types themselves track enclosing types regardless of whether the state is accessed or not. This creates a mismatch in expectations in code generation
time, if we choose to make the lambda method static. To keep things simple and avoid a messy rollback, we force the lambda to be an instance method under
this situation. However if per source, the lambda occurs in a static context, we would generate a static synthetic method.
*/
MethodScope methodScope = methodScope();
while (methodScope != null && methodScope.referenceContext instanceof LambdaExpression) {
LambdaExpression lambda = (LambdaExpression) methodScope.referenceContext;
if (!lambda.scope.isStatic && !lambda.scope.isConstructorCall) {
lambda.shouldCaptureInstance = true;
}
methodScope = methodScope.enclosingMethodScope();
}
}
/* Create the class scope & binding for the local type.
*/
public final void addLocalType(TypeDeclaration localType) {
ClassScope localTypeScope = new ClassScope(this, localType);
addSubscope(localTypeScope);
localTypeScope.buildLocalTypeBinding(enclosingSourceType());
// See comment in addAnonymousType.
MethodScope methodScope = methodScope();
while (methodScope != null && methodScope.referenceContext instanceof LambdaExpression) {
LambdaExpression lambda = (LambdaExpression) methodScope.referenceContext;
if (!lambda.scope.isStatic && !lambda.scope.isConstructorCall) {
lambda.shouldCaptureInstance = true;
}
methodScope = methodScope.enclosingMethodScope();
}
}
/* Insert a local variable into a given scope, updating its position
* and checking there are not too many locals or arguments allocated.
*/
public final void addLocalVariable(LocalVariableBinding binding) {
checkAndSetModifiersForVariable(binding);
// insert local in scope
if (this.localIndex == this.locals.length)
System.arraycopy(
this.locals,
0,
(this.locals = new LocalVariableBinding[this.localIndex * 2]),
0,
this.localIndex);
this.locals[this.localIndex++] = binding;
// update local variable binding
binding.declaringScope = this;
binding.id = outerMostMethodScope().analysisIndex++;
// share the outermost method scope analysisIndex
}
public void addSubscope(Scope childScope) {
if (this.subscopeCount == this.subscopes.length)
System.arraycopy(
this.subscopes,
0,
(this.subscopes = new Scope[this.subscopeCount * 2]),
0,
this.subscopeCount);
this.subscopes[this.subscopeCount++] = childScope;
}
/**
* Answer true if the receiver is suitable for assigning final blank fields.
* in other words, it is inside an initializer, a constructor or a clinit
*/
public final boolean allowBlankFinalFieldAssignment(FieldBinding binding) {
if (TypeBinding.notEquals(enclosingReceiverType(), binding.declaringClass))
return false;
MethodScope methodScope = methodScope();
if (methodScope.isStatic != binding.isStatic())
return false;
if (methodScope.isLambdaScope())
return false;
return methodScope.isInsideInitializer() // inside initializer
|| ((AbstractMethodDeclaration) methodScope.referenceContext).isInitializationMethod(); // inside constructor or clinit
}
String basicToString(int tab) {
String newLine = "\n"; //$NON-NLS-1$
for (int i = tab; --i >= 0;)
newLine += "\t"; //$NON-NLS-1$
String s = newLine + "--- Block Scope ---"; //$NON-NLS-1$
newLine += "\t"; //$NON-NLS-1$
s += newLine + "locals:"; //$NON-NLS-1$
for (int i = 0; i < this.localIndex; i++)
s += newLine + "\t" + this.locals[i].toString(); //$NON-NLS-1$
s += newLine + "startIndex = " + this.startIndex; //$NON-NLS-1$
return s;
}
private void checkAndSetModifiersForVariable(LocalVariableBinding varBinding) {
int modifiers = varBinding.modifiers;
if ((modifiers & ExtraCompilerModifiers.AccAlternateModifierProblem) != 0 && varBinding.declaration != null){
problemReporter().duplicateModifierForVariable(varBinding.declaration, this instanceof MethodScope);
}
int realModifiers = modifiers & ExtraCompilerModifiers.AccJustFlag;
int unexpectedModifiers = ~ClassFileConstants.AccFinal;
if ((realModifiers & unexpectedModifiers) != 0 && varBinding.declaration != null){
problemReporter().illegalModifierForVariable(varBinding.declaration, this instanceof MethodScope);
}
varBinding.modifiers = modifiers;
}
/* Compute variable positions in scopes given an initial position offset
* ignoring unused local variables.
*
* No argument is expected here (ilocal is the first non-argument local of the outermost scope)
* Arguments are managed by the MethodScope method
*/
void computeLocalVariablePositions(int ilocal, int initOffset, CodeStream codeStream) {
this.offset = initOffset;
this.maxOffset = initOffset;
// local variable init
int maxLocals = this.localIndex;
boolean hasMoreVariables = ilocal < maxLocals;
// scope init
int iscope = 0, maxScopes = this.subscopeCount;
boolean hasMoreScopes = maxScopes > 0;
// iterate scopes and variables in parallel
while (hasMoreVariables || hasMoreScopes) {
if (hasMoreScopes
&& (!hasMoreVariables || (this.subscopes[iscope].startIndex() <= ilocal))) {
// consider subscope first
if (this.subscopes[iscope] instanceof BlockScope) {
BlockScope subscope = (BlockScope) this.subscopes[iscope];
int subOffset = subscope.shiftScopes == null ? this.offset : subscope.maxShiftedOffset();
subscope.computeLocalVariablePositions(0, subOffset, codeStream);
if (subscope.maxOffset > this.maxOffset)
this.maxOffset = subscope.maxOffset;
}
hasMoreScopes = ++iscope < maxScopes;
} else {
// consider variable first
LocalVariableBinding local = this.locals[ilocal]; // if no local at all, will be locals[ilocal]==null
// check if variable is actually used, and may force it to be preserved
boolean generateCurrentLocalVar = (local.useFlag > LocalVariableBinding.UNUSED && local.constant() == Constant.NotAConstant);
// do not report fake used variable
if (local.useFlag == LocalVariableBinding.UNUSED
&& (local.declaration != null) // unused (and non secret) local
&& ((local.declaration.bits & ASTNode.IsLocalDeclarationReachable) != 0)) { // declaration is reachable
if (local.isCatchParameter()) {
problemReporter().unusedExceptionParameter(local.declaration); // report unused catch arguments
}
else {
problemReporter().unusedLocalVariable(local.declaration);
}
}
// could be optimized out, but does need to preserve unread variables ?
if (!generateCurrentLocalVar) {
if (local.declaration != null && compilerOptions().preserveAllLocalVariables) {
generateCurrentLocalVar = true; // force it to be preserved in the generated code
if (local.useFlag == LocalVariableBinding.UNUSED)
local.useFlag = LocalVariableBinding.USED;
}
}
// allocate variable
if (generateCurrentLocalVar) {
if (local.declaration != null) {
codeStream.record(local); // record user-defined local variables for attribute generation
}
// assign variable position
local.resolvedPosition = this.offset;
if ((TypeBinding.equalsEquals(local.type, TypeBinding.LONG)) || (TypeBinding.equalsEquals(local.type, TypeBinding.DOUBLE))) {
this.offset += 2;
} else {
this.offset++;
}
if (this.offset > 0xFFFF) { // no more than 65535 words of locals
problemReporter().noMoreAvailableSpaceForLocal(
local,
local.declaration == null ? (ASTNode)methodScope().referenceContext : local.declaration);
}
} else {
local.resolvedPosition = -1; // not generated
}
hasMoreVariables = ++ilocal < maxLocals;
}
}
if (this.offset > this.maxOffset)
this.maxOffset = this.offset;
}
/*
* Record the suitable binding denoting a synthetic field or constructor argument,
* mapping to the actual outer local variable in the scope context.
* Note that this may not need any effect, in case the outer local variable does not
* need to be emulated and can directly be used as is (using its back pointer to its
* declaring scope).
*/
public void emulateOuterAccess(LocalVariableBinding outerLocalVariable) {
BlockScope outerVariableScope = outerLocalVariable.declaringScope;
if (outerVariableScope == null)
return; // no need to further emulate as already inserted (val$this$0)
int depth = 0;
Scope scope = this;
while (outerVariableScope != scope) {
switch(scope.kind) {
case CLASS_SCOPE:
depth++;
break;
case METHOD_SCOPE:
if (scope.isLambdaScope()) {
LambdaExpression lambdaExpression = (LambdaExpression) scope.referenceContext();
lambdaExpression.addSyntheticArgument(outerLocalVariable);
}
break;
}
scope = scope.parent;
}
if (depth == 0)
return;
MethodScope currentMethodScope = methodScope();
if (outerVariableScope.methodScope() != currentMethodScope) {
NestedTypeBinding currentType = (NestedTypeBinding) enclosingSourceType();
//do nothing for member types, pre emulation was performed already
if (!currentType.isLocalType()) {
return;
}
// must also add a synthetic field if we're not inside a constructor
if (!currentMethodScope.isInsideInitializerOrConstructor()) {
currentType.addSyntheticArgumentAndField(outerLocalVariable);
} else {
currentType.addSyntheticArgument(outerLocalVariable);
}
}
}
/* Note that it must never produce a direct access to the targetEnclosingType,
* but instead a field sequence (this$2.this$1.this$0) so as to handle such a test case:
*
* class XX {
* void foo() {
* class A {
* class B {
* class C {
* boolean foo() {
* return (Object) A.this == (Object) B.this;
* }
* }
* }
* }
* new A().new B().new C();
* }
* }
* where we only want to deal with ONE enclosing instance for C (could not figure out an A for C)
*/
public final ReferenceBinding findLocalType(char[] name) {
long compliance = compilerOptions().complianceLevel;
for (int i = this.subscopeCount-1; i >= 0; i--) {
if (this.subscopes[i] instanceof ClassScope) {
LocalTypeBinding sourceType = (LocalTypeBinding)((ClassScope) this.subscopes[i]).referenceContext.binding;
// from 1.4 on, local types should not be accessed across switch case blocks (52221)
if (compliance >= ClassFileConstants.JDK1_4 && sourceType.enclosingCase != null) {
if (!isInsideCase(sourceType.enclosingCase)) {
continue;
}
}
if (CharOperation.equals(sourceType.sourceName(), name))
return sourceType;
}
}
return null;
}
/**
* Returns all declarations of most specific locals containing a given position in their source range.
* This code does not recurse in nested types.
* Returned array may have null values at trailing indexes.
*/
public LocalDeclaration[] findLocalVariableDeclarations(int position) {
// local variable init
int ilocal = 0, maxLocals = this.localIndex;
boolean hasMoreVariables = maxLocals > 0;
LocalDeclaration[] localDeclarations = null;
int declPtr = 0;
// scope init
int iscope = 0, maxScopes = this.subscopeCount;
boolean hasMoreScopes = maxScopes > 0;
// iterate scopes and variables in parallel
while (hasMoreVariables || hasMoreScopes) {
if (hasMoreScopes
&& (!hasMoreVariables || (this.subscopes[iscope].startIndex() <= ilocal))) {
// consider subscope first
Scope subscope = this.subscopes[iscope];
if (subscope.kind == Scope.BLOCK_SCOPE) { // do not dive in nested types
localDeclarations = ((BlockScope)subscope).findLocalVariableDeclarations(position);
if (localDeclarations != null) {
return localDeclarations;
}
}
hasMoreScopes = ++iscope < maxScopes;
} else {
// consider variable first
LocalVariableBinding local = this.locals[ilocal]; // if no local at all, will be locals[ilocal]==null
if (local != null) {
LocalDeclaration localDecl = local.declaration;
if (localDecl != null) {
if (localDecl.declarationSourceStart <= position) {
if (position <= localDecl.declarationSourceEnd) {
if (localDeclarations == null) {
localDeclarations = new LocalDeclaration[maxLocals];
}
localDeclarations[declPtr++] = localDecl;
}
} else {
return localDeclarations;
}
}
}
hasMoreVariables = ++ilocal < maxLocals;
if (!hasMoreVariables && localDeclarations != null) {
return localDeclarations;
}
}
}
return null;
}
public LocalVariableBinding findVariable(char[] variableName) {
int varLength = variableName.length;
for (int i = this.localIndex-1; i >= 0; i--) { // lookup backward to reach latest additions first
LocalVariableBinding local;
char[] localName;
if ((localName = (local = this.locals[i]).name).length == varLength && CharOperation.equals(localName, variableName))
return local;
}
return null;
}
/* API
* flag is a mask of the following values VARIABLE (= FIELD or LOCAL), TYPE.
* Only bindings corresponding to the mask will be answered.
*
* if the VARIABLE mask is set then
* If the first name provided is a field (or local) then the field (or local) is answered
* Otherwise, package names and type names are consumed until a field is found.
* In this case, the field is answered.
*
* if the TYPE mask is set,
* package names and type names are consumed until the end of the input.
* Only if all of the input is consumed is the type answered
*
* All other conditions are errors, and a problem binding is returned.
*
* NOTE: If a problem binding is returned, senders should extract the compound name
* from the binding & not assume the problem applies to the entire compoundName.
*
* The VARIABLE mask has precedence over the TYPE mask.
*
* InvocationSite implements
* isSuperAccess(); this is used to determine if the discovered field is visible.
* setFieldIndex(int); this is used to record the number of names that were consumed.
*
* For example, getBinding({"foo","y","q", VARIABLE, site) will answer
* the binding for the field or local named "foo" (or an error binding if none exists).
* In addition, setFieldIndex(1) will be sent to the invocation site.
* If a type named "foo" exists, it will not be detected (and an error binding will be answered)
*
* IMPORTANT NOTE: This method is written under the assumption that compoundName is longer than length 1.
*/
public Binding getBinding(char[][] compoundName, int mask, InvocationSite invocationSite, boolean needResolve) {
Binding binding = getBinding(compoundName[0], mask | Binding.TYPE | Binding.PACKAGE, invocationSite, needResolve);
invocationSite.setFieldIndex(1);
if (binding instanceof VariableBinding) return binding;
CompilationUnitScope unitScope = compilationUnitScope();
// in the problem case, we want to ensure we record the qualified dependency in case a type is added
// and we do not know that its package was also added (can happen with CompilationParticipants)
unitScope.recordQualifiedReference(compoundName);
if (!binding.isValidBinding()) return binding;
int length = compoundName.length;
int currentIndex = 1;
foundType : if (binding instanceof PackageBinding) {
PackageBinding packageBinding = (PackageBinding) binding;
while (currentIndex < length) {
unitScope.recordReference(packageBinding.compoundName, compoundName[currentIndex]);
binding = packageBinding.getTypeOrPackage(compoundName[currentIndex++]);
invocationSite.setFieldIndex(currentIndex);
if (binding == null) {
if (currentIndex == length) {
// must be a type if its the last name, otherwise we have no idea if its a package or type
return new ProblemReferenceBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
null,
ProblemReasons.NotFound);
}
return new ProblemBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
ProblemReasons.NotFound);
}
if (binding instanceof ReferenceBinding) {
if (!binding.isValidBinding())
return new ProblemReferenceBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
(ReferenceBinding)((ReferenceBinding)binding).closestMatch(),
binding.problemId());
if (!((ReferenceBinding) binding).canBeSeenBy(this))
return new ProblemReferenceBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
(ReferenceBinding) binding,
ProblemReasons.NotVisible);
break foundType;
}
packageBinding = (PackageBinding) binding;
}
// It is illegal to request a PACKAGE from this method.
return new ProblemReferenceBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
null,
ProblemReasons.NotFound);
}
// know binding is now a ReferenceBinding
ReferenceBinding referenceBinding = (ReferenceBinding) binding;
binding = environment().convertToRawType(referenceBinding, false /*do not force conversion of enclosing types*/);
if (invocationSite instanceof ASTNode) {
ASTNode invocationNode = (ASTNode) invocationSite;
if (invocationNode.isTypeUseDeprecated(referenceBinding, this)) {
problemReporter().deprecatedType(referenceBinding, invocationNode);
}
}
Binding problemFieldBinding = null;
while (currentIndex < length) {
referenceBinding = (ReferenceBinding) binding;
char[] nextName = compoundName[currentIndex++];
invocationSite.setFieldIndex(currentIndex);
invocationSite.setActualReceiverType(referenceBinding);
if ((mask & Binding.FIELD) != 0 && (binding = findField(referenceBinding, nextName, invocationSite, true /*resolve*/)) != null) {
if (binding.isValidBinding()) {
break; // binding is now a field
}
problemFieldBinding = new ProblemFieldBinding(
((ProblemFieldBinding)binding).closestMatch,
((ProblemFieldBinding)binding).declaringClass,
CharOperation.concatWith(CharOperation.subarray(compoundName, 0, currentIndex), '.'),
binding.problemId());
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=317858 : If field is inaccessible,
// don't give up yet, continue to look for a visible member type
if (binding.problemId() != ProblemReasons.NotVisible) {
return problemFieldBinding;
}
}
if ((binding = findMemberType(nextName, referenceBinding)) == null) {
if (problemFieldBinding != null) {
return problemFieldBinding;
}
if ((mask & Binding.FIELD) != 0) {
return new ProblemFieldBinding(
null,
referenceBinding,
nextName,
ProblemReasons.NotFound);
} else if ((mask & Binding.VARIABLE) != 0) {
return new ProblemBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
referenceBinding,
ProblemReasons.NotFound);
}
return new ProblemReferenceBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
referenceBinding,
ProblemReasons.NotFound);
}
// binding is a ReferenceBinding
if (!binding.isValidBinding()) {
if (problemFieldBinding != null) {
return problemFieldBinding;
}
return new ProblemReferenceBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
(ReferenceBinding)((ReferenceBinding)binding).closestMatch(),
binding.problemId());
}
if (invocationSite instanceof ASTNode) {
referenceBinding = (ReferenceBinding) binding;
ASTNode invocationNode = (ASTNode) invocationSite;
if (invocationNode.isTypeUseDeprecated(referenceBinding, this)) {
problemReporter().deprecatedType(referenceBinding, invocationNode);
}
}
}
if ((mask & Binding.FIELD) != 0 && (binding instanceof FieldBinding)) {
// was looking for a field and found a field
FieldBinding field = (FieldBinding) binding;
if (!field.isStatic())
return new ProblemFieldBinding(
field,
field.declaringClass,
CharOperation.concatWith(CharOperation.subarray(compoundName, 0, currentIndex), '.'),
ProblemReasons.NonStaticReferenceInStaticContext);
// Since a qualified reference must be for a static member, it won't affect static-ness of the enclosing method,
// so we don't have to call resetEnclosingMethodStaticFlag() in this case
return binding;
}
if ((mask & Binding.TYPE) != 0 && (binding instanceof ReferenceBinding)) {
// was looking for a type and found a type
return binding;
}
// handle the case when a field or type was asked for but we resolved the compoundName to a type or field
return new ProblemBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
ProblemReasons.NotFound);
}
// Added for code assist... NOT Public API
public final Binding getBinding(char[][] compoundName, InvocationSite invocationSite) {
int currentIndex = 0;
int length = compoundName.length;
Binding binding =
getBinding(
compoundName[currentIndex++],
Binding.VARIABLE | Binding.TYPE | Binding.PACKAGE,
invocationSite,
true /*resolve*/);
if (!binding.isValidBinding())
return binding;
foundType : if (binding instanceof PackageBinding) {
while (currentIndex < length) {
PackageBinding packageBinding = (PackageBinding) binding;
binding = packageBinding.getTypeOrPackage(compoundName[currentIndex++]);
if (binding == null) {
if (currentIndex == length) {
// must be a type if its the last name, otherwise we have no idea if its a package or type
return new ProblemReferenceBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
null,
ProblemReasons.NotFound);
}
return new ProblemBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
ProblemReasons.NotFound);
}
if (binding instanceof ReferenceBinding) {
if (!binding.isValidBinding())
return new ProblemReferenceBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
(ReferenceBinding)((ReferenceBinding)binding).closestMatch(),
binding.problemId());
if (!((ReferenceBinding) binding).canBeSeenBy(this))
return new ProblemReferenceBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
(ReferenceBinding) binding,
ProblemReasons.NotVisible);
break foundType;
}
}
return binding;
}
foundField : if (binding instanceof ReferenceBinding) {
while (currentIndex < length) {
ReferenceBinding typeBinding = (ReferenceBinding) binding;
char[] nextName = compoundName[currentIndex++];
TypeBinding receiverType = typeBinding.capture(this, invocationSite.sourceStart(), invocationSite.sourceEnd());
if ((binding = findField(receiverType, nextName, invocationSite, true /*resolve*/)) != null) {
if (!binding.isValidBinding()) {
return new ProblemFieldBinding(
(FieldBinding) binding,
((FieldBinding) binding).declaringClass,
CharOperation.concatWith(CharOperation.subarray(compoundName, 0, currentIndex), '.'),
binding.problemId());
}
if (!((FieldBinding) binding).isStatic())
return new ProblemFieldBinding(
(FieldBinding) binding,
((FieldBinding) binding).declaringClass,
CharOperation.concatWith(CharOperation.subarray(compoundName, 0, currentIndex), '.'),
ProblemReasons.NonStaticReferenceInStaticContext);
break foundField; // binding is now a field
}
if ((binding = findMemberType(nextName, typeBinding)) == null) {
return new ProblemBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
typeBinding,
ProblemReasons.NotFound);
}
if (!binding.isValidBinding()) {
return new ProblemReferenceBinding(
CharOperation.subarray(compoundName, 0, currentIndex),
(ReferenceBinding)((ReferenceBinding)binding).closestMatch(),
binding.problemId());
}
}
return binding;
}
VariableBinding variableBinding = (VariableBinding) binding;
while (currentIndex < length) {
TypeBinding typeBinding = variableBinding.type;
if (typeBinding == null) {
return new ProblemFieldBinding(
null,
null,
CharOperation.concatWith(CharOperation.subarray(compoundName, 0, currentIndex), '.'),
ProblemReasons.NotFound);
}
TypeBinding receiverType = typeBinding.capture(this, invocationSite.sourceStart(), invocationSite.sourceEnd());
variableBinding = findField(receiverType, compoundName[currentIndex++], invocationSite, true /*resolve*/);
if (variableBinding == null) {
return new ProblemFieldBinding(
null,
receiverType instanceof ReferenceBinding ? (ReferenceBinding) receiverType : null,
CharOperation.concatWith(CharOperation.subarray(compoundName, 0, currentIndex), '.'),
ProblemReasons.NotFound);
}
if (!variableBinding.isValidBinding())
return variableBinding;
}
return variableBinding;
}
/*
* This retrieves the argument that maps to an enclosing instance of the suitable type,
* if not found then answers nil -- do not create one
*
* #implicitThis : the implicit this will be ok
* #((arg) this$n) : available as a constructor arg
* #((arg) this$n ... this$p) : available as as a constructor arg + a sequence of fields
* #((fieldDescr) this$n ... this$p) : available as a sequence of fields
* nil : not found
*
* Note that this algorithm should answer the shortest possible sequence when
* shortcuts are available:
* this$0 . this$0 . this$0
* instead of
* this$2 . this$1 . this$0 . this$1 . this$0
* thus the code generation will be more compact and runtime faster
*/
public VariableBinding[] getEmulationPath(LocalVariableBinding outerLocalVariable) {
MethodScope currentMethodScope = methodScope();
SourceTypeBinding sourceType = currentMethodScope.enclosingSourceType();
// identity check
BlockScope variableScope = outerLocalVariable.declaringScope;
if (variableScope == null /*val$this$0*/ || currentMethodScope == variableScope.methodScope()) {
return new VariableBinding[] { outerLocalVariable };
// implicit this is good enough
}
if (currentMethodScope.isLambdaScope()) {
LambdaExpression lambda = (LambdaExpression) currentMethodScope.referenceContext;
SyntheticArgumentBinding syntheticArgument;
if ((syntheticArgument = lambda.getSyntheticArgument(outerLocalVariable)) != null) {
return new VariableBinding[] { syntheticArgument };
}
}
// use synthetic constructor arguments if possible
if (currentMethodScope.isInsideInitializerOrConstructor()
&& (sourceType.isNestedType())) {
SyntheticArgumentBinding syntheticArg;
if ((syntheticArg = ((NestedTypeBinding) sourceType).getSyntheticArgument(outerLocalVariable)) != null) {
return new VariableBinding[] { syntheticArg };
}
}
// use a synthetic field then
if (!currentMethodScope.isStatic) {
FieldBinding syntheticField;
if ((syntheticField = sourceType.getSyntheticField(outerLocalVariable)) != null) {
return new VariableBinding[] { syntheticField };
}
}
return null;
}
/*
* This retrieves the argument that maps to an enclosing instance of the suitable type,
* if not found then answers nil -- do not create one
*
* #implicitThis : the implicit this will be ok
* #((arg) this$n) : available as a constructor arg
* #((arg) this$n access$m... access$p) : available as as a constructor arg + a sequence of synthetic accessors to synthetic fields
* #((fieldDescr) this$n access#m... access$p) : available as a first synthetic field + a sequence of synthetic accessors to synthetic fields
* null : not found
* jls 15.9.2 + http://www.ergnosis.com/java-spec-report/java-language/jls-8.8.5.1-d.html
*/
public Object[] getEmulationPath(ReferenceBinding targetEnclosingType, boolean onlyExactMatch, boolean denyEnclosingArgInConstructorCall) {
MethodScope currentMethodScope = methodScope();
SourceTypeBinding sourceType = currentMethodScope.enclosingSourceType();
// use 'this' if possible
if (!currentMethodScope.isStatic && !currentMethodScope.isConstructorCall) {
if (TypeBinding.equalsEquals(sourceType, targetEnclosingType) || (!onlyExactMatch && sourceType.findSuperTypeOriginatingFrom(targetEnclosingType) != null)) {
return BlockScope.EmulationPathToImplicitThis; // implicit this is good enough
}
}
if (!sourceType.isNestedType() || sourceType.isStatic()) { // no emulation from within non-inner types
if (currentMethodScope.isConstructorCall) {
return BlockScope.NoEnclosingInstanceInConstructorCall;
} else if (currentMethodScope.isStatic){
return BlockScope.NoEnclosingInstanceInStaticContext;
}
return null;
}
boolean insideConstructor = currentMethodScope.isInsideInitializerOrConstructor();
// use synthetic constructor arguments if possible
if (insideConstructor) {
SyntheticArgumentBinding syntheticArg;
if ((syntheticArg = ((NestedTypeBinding) sourceType).getSyntheticArgument(targetEnclosingType, onlyExactMatch, currentMethodScope.isConstructorCall)) != null) {
boolean isAnonymousAndHasEnclosing = sourceType.isAnonymousType()
&& sourceType.scope.referenceContext.allocation.enclosingInstance != null;
// reject allocation and super constructor call
if (denyEnclosingArgInConstructorCall
&& currentMethodScope.isConstructorCall
&& !isAnonymousAndHasEnclosing
&& (TypeBinding.equalsEquals(sourceType, targetEnclosingType) || (!onlyExactMatch && sourceType.findSuperTypeOriginatingFrom(targetEnclosingType) != null))) {
return BlockScope.NoEnclosingInstanceInConstructorCall;
}
return new Object[] { syntheticArg };
}
}
// use a direct synthetic field then
if (currentMethodScope.isStatic) {
return BlockScope.NoEnclosingInstanceInStaticContext;
}
if (sourceType.isAnonymousType()) {
ReferenceBinding enclosingType = sourceType.enclosingType();
if (enclosingType.isNestedType()) {
NestedTypeBinding nestedEnclosingType = (NestedTypeBinding) enclosingType;
SyntheticArgumentBinding enclosingArgument = nestedEnclosingType.getSyntheticArgument(nestedEnclosingType.enclosingType(), onlyExactMatch, currentMethodScope.isConstructorCall);
if (enclosingArgument != null) {
FieldBinding syntheticField = sourceType.getSyntheticField(enclosingArgument);
if (syntheticField != null) {
if (TypeBinding.equalsEquals(syntheticField.type, targetEnclosingType) || (!onlyExactMatch && ((ReferenceBinding)syntheticField.type).findSuperTypeOriginatingFrom(targetEnclosingType) != null))
return new Object[] { syntheticField };
}
}
}
}
FieldBinding syntheticField = sourceType.getSyntheticField(targetEnclosingType, onlyExactMatch);
if (syntheticField != null) {
if (currentMethodScope.isConstructorCall){
return BlockScope.NoEnclosingInstanceInConstructorCall;
}
return new Object[] { syntheticField };
}
// could be reached through a sequence of enclosing instance link (nested members)
Object[] path = new Object[2]; // probably at least 2 of them
ReferenceBinding currentType = sourceType.enclosingType();
if (insideConstructor) {
path[0] = ((NestedTypeBinding) sourceType).getSyntheticArgument(currentType, onlyExactMatch, currentMethodScope.isConstructorCall);
} else {
if (currentMethodScope.isConstructorCall){
return BlockScope.NoEnclosingInstanceInConstructorCall;
}
path[0] = sourceType.getSyntheticField(currentType, onlyExactMatch);
}
if (path[0] != null) { // keep accumulating
int count = 1;
ReferenceBinding currentEnclosingType;
while ((currentEnclosingType = currentType.enclosingType()) != null) {
//done?
if (TypeBinding.equalsEquals(currentType, targetEnclosingType)
|| (!onlyExactMatch && currentType.findSuperTypeOriginatingFrom(targetEnclosingType) != null)) break;
if (currentMethodScope != null) {
currentMethodScope = currentMethodScope.enclosingMethodScope();
if (currentMethodScope != null && currentMethodScope.isConstructorCall){
return BlockScope.NoEnclosingInstanceInConstructorCall;
}
if (currentMethodScope != null && currentMethodScope.isStatic){
return BlockScope.NoEnclosingInstanceInStaticContext;
}
}
syntheticField = ((NestedTypeBinding) currentType).getSyntheticField(currentEnclosingType, onlyExactMatch);
if (syntheticField == null) break;
// append inside the path
if (count == path.length) {
System.arraycopy(path, 0, (path = new Object[count + 1]), 0, count);
}
// private access emulation is necessary since synthetic field is private
path[count++] = ((SourceTypeBinding) syntheticField.declaringClass).addSyntheticMethod(syntheticField, true/*read*/, false /*not super access*/);
currentType = currentEnclosingType;
}
if (TypeBinding.equalsEquals(currentType, targetEnclosingType)
|| (!onlyExactMatch && currentType.findSuperTypeOriginatingFrom(targetEnclosingType) != null)) {
return path;
}
}
return null;
}
/* Answer true if the variable name already exists within the receiver's scope.
*/
public final boolean isDuplicateLocalVariable(char[] name) {
BlockScope current = this;
while (true) {
for (int i = 0; i < this.localIndex; i++) {
if (CharOperation.equals(name, current.locals[i].name))
return true;
}
if (current.kind != Scope.BLOCK_SCOPE) return false;
current = (BlockScope)current.parent;
}
}
public int maxShiftedOffset() {
int max = -1;
if (this.shiftScopes != null){
for (int i = 0, length = this.shiftScopes.length; i < length; i++){
if (this.shiftScopes[i] != null) {
int subMaxOffset = this.shiftScopes[i].maxOffset;
if (subMaxOffset > max) max = subMaxOffset;
}
}
}
return max;
}
/**
* Returns true if the context requires to check initialization of final blank fields.
* in other words, it is inside an initializer, a constructor or a clinit
*/
public final boolean needBlankFinalFieldInitializationCheck(FieldBinding binding) {
boolean isStatic = binding.isStatic();
ReferenceBinding fieldDeclaringClass = binding.declaringClass;
// loop in enclosing context, until reaching the field declaring context
MethodScope methodScope = namedMethodScope();
while (methodScope != null) {
if (methodScope.isStatic != isStatic)
return false;
if (!methodScope.isInsideInitializer() // inside initializer
&& !((AbstractMethodDeclaration) methodScope.referenceContext).isInitializationMethod()) { // inside constructor or clinit
return false; // found some non-initializer context
}
ReferenceBinding enclosingType = methodScope.enclosingReceiverType();
if (TypeBinding.equalsEquals(enclosingType, fieldDeclaringClass)) {
return true; // found the field context, no need to check any further
}
if (!enclosingType.erasure().isAnonymousType()) {
return false; // only check inside anonymous type
}
methodScope = methodScope.enclosingMethodScope().namedMethodScope();
}
return false;
}
/* Answer the problem reporter to use for raising new problems.
*
* Note that as a side-effect, this updates the current reference context
* (unit, type or method) in case the problem handler decides it is necessary
* to abort.
*/
public ProblemReporter problemReporter() {
return methodScope().problemReporter();
}
/*
* Code responsible to request some more emulation work inside the invocation type, so as to supply
* correct synthetic arguments to any allocation of the target type.
*/
public void propagateInnerEmulation(ReferenceBinding targetType, boolean isEnclosingInstanceSupplied) {
// no need to propagate enclosing instances, they got eagerly allocated already.
SyntheticArgumentBinding[] syntheticArguments;
if ((syntheticArguments = targetType.syntheticOuterLocalVariables()) != null) {
for (int i = 0, max = syntheticArguments.length; i < max; i++) {
SyntheticArgumentBinding syntheticArg = syntheticArguments[i];
// need to filter out the one that could match a supplied enclosing instance
if (!(isEnclosingInstanceSupplied
&& (TypeBinding.equalsEquals(syntheticArg.type, targetType.enclosingType())))) {
emulateOuterAccess(syntheticArg.actualOuterLocalVariable);
}
}
}
}
/* Answer the reference type of this scope.
*
* It is the nearest enclosing type of this scope.
*/
public TypeDeclaration referenceType() {
return methodScope().referenceType();
}
/*
* Answer the index of this scope relatively to its parent.
* For method scope, answers -1 (not a classScope relative position)
*/
public int scopeIndex() {
if (this instanceof MethodScope) return -1;
BlockScope parentScope = (BlockScope)this.parent;
Scope[] parentSubscopes = parentScope.subscopes;
for (int i = 0, max = parentScope.subscopeCount; i < max; i++) {
if (parentSubscopes[i] == this) return i;
}
return -1;
}
// start position in this scope - for ordering scopes vs. variables
int startIndex() {
return this.startIndex;
}
public String toString() {
return toString(0);
}
public String toString(int tab) {
String s = basicToString(tab);
for (int i = 0; i < this.subscopeCount; i++)
if (this.subscopes[i] instanceof BlockScope)
s += ((BlockScope) this.subscopes[i]).toString(tab + 1) + "\n"; //$NON-NLS-1$
return s;
}
private List trackingVariables; // can be null if no resources are tracked
/** Used only during analyseCode and only for checking if a resource was closed in a finallyBlock. */
public FlowInfo finallyInfo;
/**
* Register a tracking variable and compute its id.
*/
public int registerTrackingVariable(FakedTrackingVariable fakedTrackingVariable) {
if (this.trackingVariables == null)
this.trackingVariables = new ArrayList(3);
this.trackingVariables.add(fakedTrackingVariable);
MethodScope outerMethodScope = outerMostMethodScope();
return outerMethodScope.analysisIndex++;
}
/** When are no longer interested in this tracking variable - remove it. */
public void removeTrackingVar(FakedTrackingVariable trackingVariable) {
if (trackingVariable.innerTracker != null) {
trackingVariable.innerTracker.withdraw();
trackingVariable.innerTracker = null;
}
if (this.trackingVariables != null)
if (this.trackingVariables.remove(trackingVariable))
return;
if (this.parent instanceof BlockScope)
((BlockScope)this.parent).removeTrackingVar(trackingVariable);
}
/** Unregister a wrapper resource without affecting its inner. */
public void pruneWrapperTrackingVar(FakedTrackingVariable trackingVariable) {
this.trackingVariables.remove(trackingVariable);
}
/**
* At the end of a block check the closing-status of all tracked closeables that are declared in this block.
* Also invoked when entering unreachable code.
*/
public void checkUnclosedCloseables(FlowInfo flowInfo, FlowContext flowContext, ASTNode location, BlockScope locationScope) {
if (!compilerOptions().analyseResourceLeaks) return;
if (this.trackingVariables == null) {
// at a method return we also consider enclosing scopes
if (location != null && this.parent instanceof BlockScope)
((BlockScope) this.parent).checkUnclosedCloseables(flowInfo, flowContext, location, locationScope);
return;
}
if (location != null && flowInfo.reachMode() != 0) return;
FakedTrackingVariable returnVar = (location instanceof ReturnStatement) ?
FakedTrackingVariable.getCloseTrackingVariable(((ReturnStatement)location).expression, flowInfo, flowContext) : null;
// iterate variables according to the priorities defined in FakedTrackingVariable.IteratorForReporting.Stage
Iterator iterator = new FakedTrackingVariable.IteratorForReporting(this.trackingVariables, this, location != null);
while (iterator.hasNext()) {
FakedTrackingVariable trackingVar = iterator.next();
if (returnVar != null && trackingVar.isResourceBeingReturned(returnVar)) {
continue;
}
if (location != null && trackingVar.hasDefinitelyNoResource(flowInfo)) {
continue; // reporting against a specific location, there is no resource at this flow, don't complain
}
if (location != null && flowContext != null && flowContext.recordExitAgainstResource(this, flowInfo, trackingVar, location)) {
continue; // handled by the flow context
}
// compute the most specific null status for this resource,
int status = trackingVar.findMostSpecificStatus(flowInfo, this, locationScope);
if (status == FlowInfo.NULL) {
// definitely unclosed: highest priority
reportResourceLeak(trackingVar, location, status);
continue;
}
if (location == null) // at end of block and not definitely unclosed
{
// problems at specific locations: medium priority
if (trackingVar.reportRecordedErrors(this, status, flowInfo.reachMode() != FlowInfo.REACHABLE)) // ... report previously recorded errors
continue;
}
if (status == FlowInfo.POTENTIALLY_NULL) {
// potentially unclosed: lower priority
reportResourceLeak(trackingVar, location, status);
} else if (status == FlowInfo.NON_NULL) {
// properly closed but not managed by t-w-r: lowest priority
if (environment().globalOptions.complianceLevel >= ClassFileConstants.JDK1_7)
trackingVar.reportExplicitClosing(problemReporter());
}
}
if (location == null) {
// when leaving this block dispose off all tracking variables:
for (int i=0; i always closed
}
else if ( elseFlowInfo.isDefinitelyNonNull(trackingVar.binding) // closed in else branch
&& thenFlowInfo.isDefinitelyNull(trackingVar.originalBinding)) // null in then branch
{
thenFlowInfo.markAsDefinitelyNonNull(trackingVar.binding); // -> always closed
}
else {
if (thenFlowInfo == FlowInfo.DEAD_END || elseFlowInfo == FlowInfo.DEAD_END)
continue; // short cut
for (int j=i+1; j
