/*******************************************************************************
* Copyright (c) 2000, 2009 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
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.CompilationResult;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.flow.ExceptionHandlingFlowContext;
import org.eclipse.jdt.internal.compiler.flow.FlowInfo;
import org.eclipse.jdt.internal.compiler.flow.InitializationFlowContext;
import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
import org.eclipse.jdt.internal.compiler.lookup.ClassScope;
import org.eclipse.jdt.internal.compiler.lookup.ExtraCompilerModifiers;
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.parser.Parser;
import org.eclipse.jdt.internal.compiler.problem.AbortMethod;
import org.eclipse.jdt.internal.compiler.problem.ProblemSeverities;
public class MethodDeclaration extends AbstractMethodDeclaration {
public TypeReference returnType;
public TypeParameter[] typeParameters;
/**
* MethodDeclaration constructor comment.
*/
public MethodDeclaration(CompilationResult compilationResult) {
super(compilationResult);
}
public void analyseCode(ClassScope classScope, InitializationFlowContext initializationContext, FlowInfo flowInfo) {
// starting of the code analysis for methods
if (this.ignoreFurtherInvestigation)
return;
try {
if (this.binding == null)
return;
if (!this.binding.isUsed() && !this.binding.isAbstract()) {
if (this.binding.isPrivate()
|| (((this.binding.modifiers & (ExtraCompilerModifiers.AccOverriding|ExtraCompilerModifiers.AccImplementing)) == 0)
&& this.binding.isOrEnclosedByPrivateType())) {
if (!classScope.referenceCompilationUnit().compilationResult.hasSyntaxError) {
this.scope.problemReporter().unusedPrivateMethod(this);
}
}
}
// skip enum implicit methods
if (this.binding.declaringClass.isEnum() && (this.selector == TypeConstants.VALUES || this.selector == TypeConstants.VALUEOF))
return;
// may be in a non necessary <clinit> for innerclass with static final constant fields
if (this.binding.isAbstract() || this.binding.isNative())
return;
ExceptionHandlingFlowContext methodContext =
new ExceptionHandlingFlowContext(
initializationContext,
this,
this.binding.thrownExceptions,
null,
this.scope,
FlowInfo.DEAD_END);
// tag parameters as being set
if (this.arguments != null) {
for (int i = 0, count = this.arguments.length; i < count; i++) {
flowInfo.markAsDefinitelyAssigned(this.arguments[i].binding);
}
}
// propagate to statements
if (this.statements != null) {
int complaintLevel = (flowInfo.reachMode() & FlowInfo.UNREACHABLE) == 0 ? Statement.NOT_COMPLAINED : Statement.COMPLAINED_FAKE_REACHABLE;
for (int i = 0, count = this.statements.length; i < count; i++) {
Statement stat = this.statements[i];
if ((complaintLevel = stat.complainIfUnreachable(flowInfo, this.scope, complaintLevel)) < Statement.COMPLAINED_UNREACHABLE) {
flowInfo = stat.analyseCode(this.scope, methodContext, flowInfo);
}
}
}
// check for missing returning path
TypeBinding returnTypeBinding = this.binding.returnType;
if ((returnTypeBinding == TypeBinding.VOID) || isAbstract()) {
if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) == 0) {
this.bits |= ASTNode.NeedFreeReturn;
}
} else {
if (flowInfo != FlowInfo.DEAD_END) {
this.scope.problemReporter().shouldReturn(returnTypeBinding, this);
}
}
// check unreachable catch blocks
methodContext.complainIfUnusedExceptionHandlers(this);
// check unused parameters
this.scope.checkUnusedParameters(this.binding);
} catch (AbortMethod e) {
this.ignoreFurtherInvestigation = true;
}
}
public boolean isMethod() {
return true;
}
public void parseStatements(Parser parser, CompilationUnitDeclaration unit) {
//fill up the method body with statement
parser.parse(this, unit);
}
public StringBuffer printReturnType(int indent, StringBuffer output) {
if (this.returnType == null) return output;
return this.returnType.printExpression(0, output).append(' ');
}
public void resolveStatements() {
// ========= abort on fatal error =============
if (this.returnType != null && this.binding != null) {
this.returnType.resolvedType = this.binding.returnType;
// record the return type binding
}
// check if method with constructor name
if (CharOperation.equals(this.scope.enclosingSourceType().sourceName, this.selector)) {
this.scope.problemReporter().methodWithConstructorName(this);
}
if (this.typeParameters != null) {
for (int i = 0, length = this.typeParameters.length; i < length; i++) {
this.typeParameters[i].resolve(this.scope);
}
}
// check @Override annotation
final CompilerOptions compilerOptions = this.scope.compilerOptions();
checkOverride: {
if (this.binding == null) break checkOverride;
long sourceLevel = compilerOptions.sourceLevel;
if (sourceLevel < ClassFileConstants.JDK1_5) break checkOverride;
int bindingModifiers = this.binding.modifiers;
boolean hasOverrideAnnotation = (this.binding.tagBits & TagBits.AnnotationOverride) != 0;
if (hasOverrideAnnotation) {
// no static method is considered overriding
if ((bindingModifiers & (ClassFileConstants.AccStatic|ExtraCompilerModifiers.AccOverriding)) == ExtraCompilerModifiers.AccOverriding)
break checkOverride;
// in 1.5, strictly for overriding superclass method
// in 1.6 and above, also tolerate implementing interface method
if (sourceLevel >= ClassFileConstants.JDK1_6
&& ((bindingModifiers & (ClassFileConstants.AccStatic|ExtraCompilerModifiers.AccImplementing)) == ExtraCompilerModifiers.AccImplementing))
break checkOverride;
// claims to override, and doesn't actually do so
this.scope.problemReporter().methodMustOverride(this);
} else if (!this.binding.declaringClass.isInterface()
&& (bindingModifiers & (ClassFileConstants.AccStatic|ExtraCompilerModifiers.AccOverriding)) == ExtraCompilerModifiers.AccOverriding) {
// actually overrides, but did not claim to do so
this.scope.problemReporter().missingOverrideAnnotation(this);
}
}
// by grammatical construction, interface methods are always abstract
switch (TypeDeclaration.kind(this.scope.referenceType().modifiers)) {
case TypeDeclaration.ENUM_DECL :
if (this.selector == TypeConstants.VALUES) break;
if (this.selector == TypeConstants.VALUEOF) break;
//$FALL-THROUGH$
case TypeDeclaration.CLASS_DECL :
// if a method has an semicolon body and is not declared as abstract==>error
// native methods may have a semicolon body
if ((this.modifiers & ExtraCompilerModifiers.AccSemicolonBody) != 0) {
if ((this.modifiers & ClassFileConstants.AccNative) == 0)
if ((this.modifiers & ClassFileConstants.AccAbstract) == 0)
this.scope.problemReporter().methodNeedBody(this);
} else {
// the method HAS a body --> abstract native modifiers are forbiden
if (((this.modifiers & ClassFileConstants.AccNative) != 0) || ((this.modifiers & ClassFileConstants.AccAbstract) != 0))
this.scope.problemReporter().methodNeedingNoBody(this);
}
}
super.resolveStatements();
// TagBits.OverridingMethodWithSupercall is set during the resolveStatements() call
if (compilerOptions.getSeverity(CompilerOptions.OverridingMethodWithoutSuperInvocation) != ProblemSeverities.Ignore) {
if (this.binding != null) {
int bindingModifiers = this.binding.modifiers;
if ((bindingModifiers & (ExtraCompilerModifiers.AccOverriding|ExtraCompilerModifiers.AccImplementing)) == ExtraCompilerModifiers.AccOverriding
&& (this.bits & ASTNode.OverridingMethodWithSupercall) == 0) {
this.scope.problemReporter().overridesMethodWithoutSuperInvocation(this.binding);
}
}
}
}
public void traverse(
ASTVisitor visitor,
ClassScope classScope) {
if (visitor.visit(this, classScope)) {
if (this.javadoc != null) {
this.javadoc.traverse(visitor, this.scope);
}
if (this.annotations != null) {
int annotationsLength = this.annotations.length;
for (int i = 0; i < annotationsLength; i++)
this.annotations[i].traverse(visitor, this.scope);
}
if (this.typeParameters != null) {
int typeParametersLength = this.typeParameters.length;
for (int i = 0; i < typeParametersLength; i++) {
this.typeParameters[i].traverse(visitor, this.scope);
}
}
if (this.returnType != null)
this.returnType.traverse(visitor, this.scope);
if (this.arguments != null) {
int argumentLength = this.arguments.length;
for (int i = 0; i < argumentLength; i++)
this.arguments[i].traverse(visitor, this.scope);
}
if (this.thrownExceptions != null) {
int thrownExceptionsLength = this.thrownExceptions.length;
for (int i = 0; i < thrownExceptionsLength; i++)
this.thrownExceptions[i].traverse(visitor, this.scope);
}
if (this.statements != null) {
int statementsLength = this.statements.length;
for (int i = 0; i < statementsLength; i++)
this.statements[i].traverse(visitor, this.scope);
}
}
visitor.endVisit(this, classScope);
}
public TypeParameter[] typeParameters() {
return this.typeParameters;
}
}