| /* |
| * Copyright 2000-2012 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* |
| * Created by IntelliJ IDEA. |
| * User: max |
| * Date: Dec 24, 2001 |
| * Time: 2:46:32 PM |
| * To change template for new class use |
| * Code Style | Class Templates options (Tools | IDE Options). |
| */ |
| package com.intellij.codeInspection.dataFlow; |
| |
| import com.intellij.codeInsight.AnnotationUtil; |
| import com.intellij.codeInsight.FileModificationService; |
| import com.intellij.codeInsight.NullableNotNullManager; |
| import com.intellij.codeInsight.daemon.GroupNames; |
| import com.intellij.codeInsight.daemon.impl.quickfix.SimplifyBooleanExpressionFix; |
| import com.intellij.codeInsight.intention.impl.AddNullableAnnotationFix; |
| import com.intellij.codeInspection.*; |
| import com.intellij.codeInspection.dataFlow.instructions.*; |
| import com.intellij.codeInspection.dataFlow.value.DfaConstValue; |
| import com.intellij.openapi.diagnostic.Logger; |
| import com.intellij.openapi.project.Project; |
| import com.intellij.openapi.util.Pair; |
| import com.intellij.openapi.util.WriteExternalException; |
| import com.intellij.openapi.util.text.StringUtil; |
| import com.intellij.pom.java.LanguageLevel; |
| import com.intellij.psi.*; |
| import com.intellij.psi.codeStyle.JavaCodeStyleManager; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.intellij.psi.util.PsiUtil; |
| import com.intellij.util.ArrayUtil; |
| import com.intellij.util.ArrayUtilRt; |
| import com.intellij.util.IncorrectOperationException; |
| import com.intellij.util.SmartList; |
| import com.intellij.util.containers.MultiMap; |
| import org.jdom.Element; |
| import org.jetbrains.annotations.NonNls; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import javax.swing.*; |
| import java.util.*; |
| |
| public class DataFlowInspectionBase extends BaseJavaBatchLocalInspectionTool { |
| private static final Logger LOG = Logger.getInstance("#com.intellij.codeInspection.dataFlow.DataFlowInspection"); |
| @NonNls private static final String SHORT_NAME = "ConstantConditions"; |
| public boolean SUGGEST_NULLABLE_ANNOTATIONS = false; |
| public boolean DONT_REPORT_TRUE_ASSERT_STATEMENTS = false; |
| public boolean IGNORE_ASSERT_STATEMENTS = false; |
| public boolean REPORT_CONSTANT_REFERENCE_VALUES = true; |
| |
| @Override |
| public JComponent createOptionsPanel() { |
| throw new RuntimeException("no UI in headless mode"); |
| } |
| |
| @Override |
| public void writeSettings(@NotNull Element node) throws WriteExternalException { |
| node.addContent(new Element("option").setAttribute("name", "SUGGEST_NULLABLE_ANNOTATIONS").setAttribute("value", String.valueOf(SUGGEST_NULLABLE_ANNOTATIONS))); |
| node.addContent(new Element("option").setAttribute("name", "DONT_REPORT_TRUE_ASSERT_STATEMENTS").setAttribute("value", String.valueOf(DONT_REPORT_TRUE_ASSERT_STATEMENTS))); |
| if (IGNORE_ASSERT_STATEMENTS) { |
| node.addContent(new Element("option").setAttribute("name", "IGNORE_ASSERT_STATEMENTS").setAttribute("value", "true")); |
| } |
| if (!REPORT_CONSTANT_REFERENCE_VALUES) { |
| node.addContent(new Element("option").setAttribute("name", "REPORT_CONSTANT_REFERENCE_VALUES").setAttribute("value", "false")); |
| } |
| } |
| |
| @Override |
| @NotNull |
| public PsiElementVisitor buildVisitor(@NotNull final ProblemsHolder holder, final boolean isOnTheFly) { |
| return new JavaElementVisitor() { |
| @Override |
| public void visitField(PsiField field) { |
| analyzeCodeBlock(field, holder, isOnTheFly); |
| } |
| |
| @Override |
| public void visitMethod(PsiMethod method) { |
| analyzeCodeBlock(method.getBody(), holder, isOnTheFly); |
| } |
| |
| @Override |
| public void visitClassInitializer(PsiClassInitializer initializer) { |
| analyzeCodeBlock(initializer.getBody(), holder, isOnTheFly); |
| } |
| |
| @Override |
| public void visitAnnotation(PsiAnnotation annotation) { |
| if (!ControlFlowAnalyzer.ORG_JETBRAINS_ANNOTATIONS_CONTRACT.equals(annotation.getQualifiedName())) return; |
| |
| PsiMethod method = PsiTreeUtil.getParentOfType(annotation, PsiMethod.class); |
| if (method == null) return; |
| |
| String text = AnnotationUtil.getStringAttributeValue(annotation, null); |
| if (text == null) return; |
| |
| String error = checkContract(method, text); |
| if (error != null) { |
| PsiAnnotationMemberValue value = annotation.findAttributeValue(null); |
| assert value != null; |
| holder.registerProblem(value, error); |
| } |
| } |
| }; |
| } |
| |
| @Nullable |
| public static String checkContract(PsiMethod method, String text) { |
| List<MethodContract> contracts; |
| try { |
| contracts = ControlFlowAnalyzer.parseContract(text); |
| } |
| catch (ControlFlowAnalyzer.ParseException e) { |
| return e.getMessage(); |
| } |
| int paramCount = method.getParameterList().getParametersCount(); |
| for (int i = 0; i < contracts.size(); i++) { |
| MethodContract contract = contracts.get(i); |
| if (contract.arguments.length != paramCount) { |
| return "Method takes " + paramCount + " parameters, while contract clause number " + (i + 1) + " expects " + contract.arguments.length; |
| } |
| } |
| return null; |
| } |
| |
| private void analyzeCodeBlock(@Nullable final PsiElement scope, ProblemsHolder holder, final boolean onTheFly) { |
| if (scope == null) return; |
| |
| PsiClass containingClass = PsiTreeUtil.getParentOfType(scope, PsiClass.class); |
| if (containingClass != null && PsiUtil.isLocalOrAnonymousClass(containingClass)) return; |
| |
| final StandardDataFlowRunner dfaRunner = new StandardDataFlowRunner(SUGGEST_NULLABLE_ANNOTATIONS) { |
| @Override |
| protected boolean shouldCheckTimeLimit() { |
| if (!onTheFly) return false; |
| return super.shouldCheckTimeLimit(); |
| } |
| }; |
| analyzeDfaWithNestedClosures(scope, holder, dfaRunner, Arrays.asList(dfaRunner.createMemoryState())); |
| } |
| |
| private void analyzeDfaWithNestedClosures(PsiElement scope, |
| ProblemsHolder holder, |
| StandardDataFlowRunner dfaRunner, |
| Collection<DfaMemoryState> initialStates) { |
| final StandardInstructionVisitor visitor = new DataFlowInstructionVisitor(dfaRunner); |
| final RunnerResult rc = dfaRunner.analyzeMethod(scope, visitor, IGNORE_ASSERT_STATEMENTS, initialStates); |
| if (rc == RunnerResult.OK) { |
| createDescription(dfaRunner, holder, visitor); |
| |
| MultiMap<PsiElement,DfaMemoryState> nestedClosures = dfaRunner.getNestedClosures(); |
| for (PsiElement closure : nestedClosures.keySet()) { |
| analyzeDfaWithNestedClosures(closure, holder, dfaRunner, nestedClosures.get(closure)); |
| } |
| } |
| else if (rc == RunnerResult.TOO_COMPLEX) { |
| if (scope.getParent() instanceof PsiMethod) { |
| PsiMethod method = (PsiMethod)scope.getParent(); |
| final PsiIdentifier name = method.getNameIdentifier(); |
| if (name != null) { // Might be null for synthetic methods like JSP page. |
| holder.registerProblem(name, InspectionsBundle.message("dataflow.too.complex"), ProblemHighlightType.WEAK_WARNING); |
| } |
| } |
| } |
| } |
| |
| @Nullable |
| private LocalQuickFix[] createNPEFixes(PsiExpression qualifier, PsiExpression expression) { |
| if (qualifier == null || expression == null) return null; |
| if (qualifier instanceof PsiMethodCallExpression) return null; |
| if (qualifier instanceof PsiLiteralExpression && ((PsiLiteralExpression)qualifier).getValue() == null) return null; |
| |
| try { |
| final List<LocalQuickFix> fixes = new SmartList<LocalQuickFix>(); |
| |
| if (PsiUtil.getLanguageLevel(qualifier).isAtLeast(LanguageLevel.JDK_1_4)) { |
| final Project project = qualifier.getProject(); |
| final PsiElementFactory elementFactory = JavaPsiFacade.getInstance(project).getElementFactory(); |
| final PsiBinaryExpression binary = (PsiBinaryExpression)elementFactory.createExpressionFromText("a != null", null); |
| binary.getLOperand().replace(qualifier); |
| fixes.add(new AddAssertStatementFix(binary)); |
| } |
| |
| addSurroundWithIfFix(qualifier, fixes); |
| |
| if (ReplaceWithTernaryOperatorFix.isAvailable(qualifier, expression)) { |
| fixes.add(new ReplaceWithTernaryOperatorFix(qualifier)); |
| } |
| return fixes.toArray(new LocalQuickFix[fixes.size()]); |
| } |
| catch (IncorrectOperationException e) { |
| LOG.error(e); |
| return null; |
| } |
| } |
| |
| protected void addSurroundWithIfFix(PsiExpression qualifier, List<LocalQuickFix> fixes) { |
| } |
| |
| private void createDescription(StandardDataFlowRunner runner, ProblemsHolder holder, StandardInstructionVisitor visitor) { |
| Pair<Set<Instruction>, Set<Instruction>> constConditions = runner.getConstConditionalExpressions(); |
| Set<Instruction> trueSet = constConditions.getFirst(); |
| Set<Instruction> falseSet = constConditions.getSecond(); |
| |
| ArrayList<Instruction> allProblems = new ArrayList<Instruction>(); |
| allProblems.addAll(trueSet); |
| allProblems.addAll(falseSet); |
| allProblems.addAll(runner.getNPEInstructions()); |
| allProblems.addAll(runner.getCCEInstructions()); |
| allProblems.addAll(StandardDataFlowRunner.getRedundantInstanceofs(runner, visitor)); |
| |
| Collections.sort(allProblems, new Comparator<Instruction>() { |
| @Override |
| public int compare(Instruction i1, Instruction i2) { |
| return i1.getIndex() - i2.getIndex(); |
| } |
| }); |
| |
| HashSet<PsiElement> reportedAnchors = new HashSet<PsiElement>(); |
| |
| for (Instruction instruction : allProblems) { |
| if (instruction instanceof MethodCallInstruction) { |
| reportCallMayProduceNpe(holder, (MethodCallInstruction)instruction, reportedAnchors); |
| } |
| else if (instruction instanceof FieldReferenceInstruction && |
| reportedAnchors.add(((FieldReferenceInstruction)instruction).getElementToAssert())) { |
| reportFieldAccessMayProduceNpe(holder, (FieldReferenceInstruction)instruction); |
| } |
| else if (instruction instanceof TypeCastInstruction && |
| reportedAnchors.add(((TypeCastInstruction)instruction).getCastExpression().getCastType())) { |
| reportCastMayFail(holder, (TypeCastInstruction)instruction); |
| } |
| else if (instruction instanceof BranchingInstruction) { |
| handleBranchingInstruction(holder, visitor, trueSet, falseSet, reportedAnchors, (BranchingInstruction)instruction); |
| } |
| } |
| |
| reportNullableArguments(runner, holder, reportedAnchors); |
| reportNullableAssignments(runner, holder, reportedAnchors); |
| reportUnboxedNullables(runner, holder, reportedAnchors); |
| reportNullableReturns(runner, holder, reportedAnchors); |
| reportNullableArgumentsPassedToNonAnnotated(runner, holder, reportedAnchors); |
| |
| if (REPORT_CONSTANT_REFERENCE_VALUES) { |
| reportConstantReferenceValues(holder, visitor, reportedAnchors); |
| } |
| } |
| |
| private static void reportConstantReferenceValues(ProblemsHolder holder, StandardInstructionVisitor visitor, Set<PsiElement> reportedAnchors) { |
| for (Pair<PsiReferenceExpression, DfaConstValue> pair : visitor.getConstantReferenceValues()) { |
| PsiReferenceExpression ref = pair.first; |
| if (!reportedAnchors.add(ref)) { |
| continue; |
| } |
| |
| final Object value = pair.second.getValue(); |
| PsiVariable constant = pair.second.getConstant(); |
| final String presentableName = constant != null ? constant.getName() : String.valueOf(value); |
| final String exprText = getConstantValueText(value, constant); |
| if (presentableName == null || exprText == null) { |
| continue; |
| } |
| |
| holder.registerProblem(ref, "Value <code>#ref</code> #loc is always '" + presentableName + "'", new LocalQuickFix() { |
| @NotNull |
| @Override |
| public String getName() { |
| return "Replace with '" + presentableName + "'"; |
| } |
| |
| @NotNull |
| @Override |
| public String getFamilyName() { |
| return "Replace with constant value"; |
| } |
| |
| @Override |
| public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) { |
| JavaPsiFacade facade = JavaPsiFacade.getInstance(project); |
| PsiElement newElement = descriptor.getPsiElement().replace(facade.getElementFactory().createExpressionFromText(exprText, null)); |
| newElement = JavaCodeStyleManager.getInstance(project).shortenClassReferences(newElement); |
| if (newElement instanceof PsiJavaCodeReferenceElement) { |
| PsiJavaCodeReferenceElement ref = (PsiJavaCodeReferenceElement)newElement; |
| PsiElement target = ref.resolve(); |
| String shortName = ref.getReferenceName(); |
| if (target != null && shortName != null && ref.isQualified() && |
| facade.getResolveHelper().resolveReferencedVariable(shortName, newElement) == target) { |
| newElement.replace(facade.getElementFactory().createExpressionFromText(shortName, null)); |
| } |
| } |
| } |
| }); |
| } |
| } |
| |
| private static String getConstantValueText(Object value, @Nullable PsiVariable constant) { |
| if (constant != null) { |
| return constant instanceof PsiMember ? PsiUtil.getMemberQualifiedName((PsiMember)constant) : constant.getName(); |
| } |
| |
| return value instanceof String ? "\"" + StringUtil.escapeStringCharacters((String)value) + "\"" : String.valueOf(value); |
| } |
| |
| private void reportNullableArgumentsPassedToNonAnnotated(StandardDataFlowRunner runner, ProblemsHolder holder, Set<PsiElement> reportedAnchors) { |
| Set<PsiExpression> exprs = runner.getNullableArgumentsPassedToNonAnnotatedParam(); |
| for (PsiExpression expr : exprs) { |
| if (reportedAnchors.contains(expr)) continue; |
| |
| final String text = isNullLiteralExpression(expr) |
| ? "Passing <code>null</code> argument to non annotated parameter" |
| : "Argument <code>#ref</code> #loc might be null but passed to non annotated parameter"; |
| LocalQuickFix[] fixes = createNPEFixes(expr, expr); |
| final PsiElement parent = expr.getParent(); |
| if (parent instanceof PsiExpressionList) { |
| final int idx = ArrayUtilRt.find(((PsiExpressionList)parent).getExpressions(), expr); |
| if (idx > -1) { |
| final PsiElement gParent = parent.getParent(); |
| if (gParent instanceof PsiCallExpression) { |
| final PsiMethod psiMethod = ((PsiCallExpression)gParent).resolveMethod(); |
| if (psiMethod != null && psiMethod.getManager().isInProject(psiMethod) && AnnotationUtil.isAnnotatingApplicable(psiMethod)) { |
| final PsiParameter[] parameters = psiMethod.getParameterList().getParameters(); |
| if (idx < parameters.length) { |
| final AddNullableAnnotationFix addNullableAnnotationFix = new AddNullableAnnotationFix(parameters[idx]); |
| fixes = fixes == null ? new LocalQuickFix[]{addNullableAnnotationFix} : ArrayUtil.append(fixes, addNullableAnnotationFix); |
| holder.registerProblem(expr, text, fixes); |
| reportedAnchors.add(expr); |
| } |
| } |
| } |
| } |
| } |
| |
| } |
| } |
| |
| private void reportCallMayProduceNpe(ProblemsHolder holder, MethodCallInstruction mcInstruction, Set<PsiElement> reportedAnchors) { |
| if (mcInstruction.getCallExpression() instanceof PsiMethodCallExpression) { |
| PsiMethodCallExpression callExpression = (PsiMethodCallExpression)mcInstruction.getCallExpression(); |
| if (!reportedAnchors.add(callExpression)) return; |
| |
| LocalQuickFix[] fix = createNPEFixes(callExpression.getMethodExpression().getQualifierExpression(), callExpression); |
| |
| holder.registerProblem(callExpression, |
| InspectionsBundle.message("dataflow.message.npe.method.invocation"), |
| fix); |
| } |
| } |
| |
| private void reportFieldAccessMayProduceNpe(ProblemsHolder holder, FieldReferenceInstruction frInstruction) { |
| PsiElement elementToAssert = frInstruction.getElementToAssert(); |
| PsiExpression expression = frInstruction.getExpression(); |
| if (expression instanceof PsiArrayAccessExpression) { |
| LocalQuickFix[] fix = createNPEFixes((PsiExpression)elementToAssert, expression); |
| holder.registerProblem(expression, |
| InspectionsBundle.message("dataflow.message.npe.array.access"), |
| fix); |
| } |
| else { |
| LocalQuickFix[] fix = createNPEFixes((PsiExpression)elementToAssert, expression); |
| assert elementToAssert != null; |
| holder.registerProblem(elementToAssert, |
| InspectionsBundle.message("dataflow.message.npe.field.access"), |
| fix); |
| } |
| } |
| |
| private static void reportCastMayFail(ProblemsHolder holder, TypeCastInstruction instruction) { |
| PsiTypeCastExpression typeCast = instruction.getCastExpression(); |
| holder.registerProblem(typeCast.getCastType(), |
| InspectionsBundle.message("dataflow.message.cce", typeCast.getOperand().getText())); |
| } |
| |
| private void handleBranchingInstruction(ProblemsHolder holder, |
| StandardInstructionVisitor visitor, |
| Set<Instruction> trueSet, |
| Set<Instruction> falseSet, HashSet<PsiElement> reportedAnchors, BranchingInstruction instruction) { |
| PsiElement psiAnchor = instruction.getPsiAnchor(); |
| boolean underBinary = isAtRHSOfBooleanAnd(psiAnchor); |
| if (instruction instanceof InstanceofInstruction && visitor.isInstanceofRedundant((InstanceofInstruction)instruction)) { |
| if (visitor.canBeNull((BinopInstruction)instruction)) { |
| holder.registerProblem(psiAnchor, |
| InspectionsBundle.message("dataflow.message.redundant.instanceof"), |
| new RedundantInstanceofFix()); |
| } |
| else { |
| final LocalQuickFix localQuickFix = createSimplifyBooleanExpressionFix(psiAnchor, true); |
| holder.registerProblem(psiAnchor, |
| InspectionsBundle.message(underBinary ? "dataflow.message.constant.condition.when.reached" : "dataflow.message.constant.condition", Boolean.toString(true)), |
| localQuickFix == null ? null : new LocalQuickFix[]{localQuickFix}); |
| } |
| } |
| else if (psiAnchor instanceof PsiSwitchLabelStatement) { |
| if (falseSet.contains(instruction)) { |
| holder.registerProblem(psiAnchor, |
| InspectionsBundle.message("dataflow.message.unreachable.switch.label")); |
| } |
| } |
| else if (psiAnchor != null && !reportedAnchors.contains(psiAnchor) && !isCompileConstantInIfCondition(psiAnchor)) { |
| boolean evaluatesToTrue = trueSet.contains(instruction); |
| if (onTheLeftSideOfConditionalAssignemnt(psiAnchor)) { |
| holder.registerProblem( |
| psiAnchor, |
| InspectionsBundle.message("dataflow.message.pointless.assignment.expression", Boolean.toString(evaluatesToTrue)), |
| createSimplifyToAssignmentFix() |
| ); |
| } |
| else if (!skipReportingConstantCondition(visitor, psiAnchor, evaluatesToTrue)) { |
| final LocalQuickFix fix = createSimplifyBooleanExpressionFix(psiAnchor, evaluatesToTrue); |
| String message = InspectionsBundle.message(underBinary ? |
| "dataflow.message.constant.condition.when.reached" : |
| "dataflow.message.constant.condition", Boolean.toString(evaluatesToTrue)); |
| holder.registerProblem(psiAnchor, message, fix == null ? null : new LocalQuickFix[]{fix}); |
| } |
| reportedAnchors.add(psiAnchor); |
| } |
| } |
| |
| private boolean skipReportingConstantCondition(StandardInstructionVisitor visitor, PsiElement psiAnchor, boolean evaluatesToTrue) { |
| return DONT_REPORT_TRUE_ASSERT_STATEMENTS && isAssertionEffectively(psiAnchor, evaluatesToTrue) || |
| visitor.silenceConstantCondition(psiAnchor); |
| } |
| |
| private void reportNullableArguments(StandardDataFlowRunner runner, ProblemsHolder holder, Set<PsiElement> reportedAnchors) { |
| Set<PsiExpression> exprs = runner.getNullableArguments(); |
| for (PsiExpression expr : exprs) { |
| if (!reportedAnchors.add(expr)) continue; |
| |
| final String text = isNullLiteralExpression(expr) |
| ? InspectionsBundle.message("dataflow.message.passing.null.argument") |
| : InspectionsBundle.message("dataflow.message.passing.nullable.argument"); |
| LocalQuickFix[] fixes = createNPEFixes(expr, expr); |
| holder.registerProblem(expr, text, fixes); |
| } |
| } |
| |
| private static void reportNullableAssignments(StandardDataFlowRunner runner, ProblemsHolder holder, Set<PsiElement> reportedAnchors) { |
| for (PsiExpression expr : runner.getNullableAssignments()) { |
| if (!reportedAnchors.add(expr)) continue; |
| |
| final String text = isNullLiteralExpression(expr) |
| ? InspectionsBundle.message("dataflow.message.assigning.null") |
| : InspectionsBundle.message("dataflow.message.assigning.nullable"); |
| holder.registerProblem(expr, text); |
| } |
| } |
| |
| private static void reportUnboxedNullables(StandardDataFlowRunner runner, ProblemsHolder holder, Set<PsiElement> reportedAnchors) { |
| for (PsiExpression expr : runner.getUnboxedNullables()) { |
| if (!reportedAnchors.add(expr)) continue; |
| holder.registerProblem(expr, InspectionsBundle.message("dataflow.message.unboxing")); |
| } |
| } |
| |
| private static void reportNullableReturns(StandardDataFlowRunner runner, ProblemsHolder holder, Set<PsiElement> reportedAnchors) { |
| for (PsiReturnStatement statement : runner.getNullableReturns()) { |
| final PsiExpression expr = statement.getReturnValue(); |
| assert expr != null; |
| if (!reportedAnchors.add(expr)) continue; |
| |
| if (runner.isInNotNullMethod()) { |
| final String text = isNullLiteralExpression(expr) |
| ? InspectionsBundle.message("dataflow.message.return.null.from.notnull") |
| : InspectionsBundle.message("dataflow.message.return.nullable.from.notnull"); |
| holder.registerProblem(expr, text); |
| } |
| else if (AnnotationUtil.isAnnotatingApplicable(statement)) { |
| final String text = isNullLiteralExpression(expr) |
| ? InspectionsBundle.message("dataflow.message.return.null.from.notnullable") |
| : InspectionsBundle.message("dataflow.message.return.nullable.from.notnullable"); |
| final NullableNotNullManager manager = NullableNotNullManager.getInstance(expr.getProject()); |
| holder.registerProblem(expr, text, new AnnotateMethodFix(manager.getDefaultNullable(), ArrayUtil.toStringArray(manager.getNotNulls())){ |
| @Override |
| public int shouldAnnotateBaseMethod(PsiMethod method, PsiMethod superMethod, Project project) { |
| return 1; |
| } |
| }); |
| } |
| } |
| } |
| |
| private static boolean isAssertionEffectively(PsiElement psiAnchor, boolean evaluatesToTrue) { |
| PsiElement parent = psiAnchor.getParent(); |
| if (parent instanceof PsiAssertStatement) { |
| return evaluatesToTrue; |
| } |
| if (parent instanceof PsiIfStatement && psiAnchor == ((PsiIfStatement)parent).getCondition()) { |
| PsiStatement thenBranch = ((PsiIfStatement)parent).getThenBranch(); |
| if (thenBranch instanceof PsiThrowStatement) { |
| return !evaluatesToTrue; |
| } |
| if (thenBranch instanceof PsiBlockStatement) { |
| PsiStatement[] statements = ((PsiBlockStatement)thenBranch).getCodeBlock().getStatements(); |
| if (statements.length == 1 && statements[0] instanceof PsiThrowStatement) { |
| return !evaluatesToTrue; |
| } |
| } |
| } |
| return false; |
| } |
| |
| private static boolean isAtRHSOfBooleanAnd(PsiElement expr) { |
| PsiElement cur = expr; |
| |
| while (cur != null && !(cur instanceof PsiMember)) { |
| PsiElement parent = cur.getParent(); |
| |
| if (parent instanceof PsiBinaryExpression && cur == ((PsiBinaryExpression)parent).getROperand()) { |
| return true; |
| } |
| |
| cur = parent; |
| } |
| |
| return false; |
| } |
| |
| private static boolean isCompileConstantInIfCondition(PsiElement element) { |
| if (!(element instanceof PsiReferenceExpression)) return false; |
| PsiElement resolved = ((PsiReferenceExpression)element).resolve(); |
| if (!(resolved instanceof PsiField)) return false; |
| PsiField field = (PsiField)resolved; |
| |
| if (!field.hasModifierProperty(PsiModifier.FINAL)) return false; |
| if (!field.hasModifierProperty(PsiModifier.STATIC)) return false; |
| |
| PsiElement parent = element.getParent(); |
| if (parent instanceof PsiPrefixExpression && ((PsiPrefixExpression)parent).getOperationTokenType() == JavaTokenType.EXCL) { |
| element = parent; |
| parent = parent.getParent(); |
| } |
| return parent instanceof PsiIfStatement && ((PsiIfStatement)parent).getCondition() == element; |
| } |
| |
| private static boolean isNullLiteralExpression(PsiExpression expr) { |
| if (expr instanceof PsiLiteralExpression) { |
| final PsiLiteralExpression literalExpression = (PsiLiteralExpression)expr; |
| return PsiType.NULL.equals(literalExpression.getType()); |
| } |
| return false; |
| } |
| |
| private static boolean onTheLeftSideOfConditionalAssignemnt(final PsiElement psiAnchor) { |
| final PsiElement parent = psiAnchor.getParent(); |
| if (parent instanceof PsiAssignmentExpression) { |
| final PsiAssignmentExpression expression = (PsiAssignmentExpression)parent; |
| if (expression.getLExpression() == psiAnchor) return true; |
| } |
| return false; |
| } |
| |
| @Nullable |
| private static LocalQuickFix createSimplifyBooleanExpressionFix(PsiElement element, final boolean value) { |
| SimplifyBooleanExpressionFix fix = createIntention(element, value); |
| if (fix == null) return null; |
| final String text = fix.getText(); |
| return new LocalQuickFix() { |
| @Override |
| @NotNull |
| public String getName() { |
| return text; |
| } |
| |
| @Override |
| public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) { |
| final PsiElement psiElement = descriptor.getPsiElement(); |
| if (psiElement == null) return; |
| final SimplifyBooleanExpressionFix fix = createIntention(psiElement, value); |
| if (fix == null) return; |
| try { |
| LOG.assertTrue(psiElement.isValid()); |
| fix.applyFix(); |
| } |
| catch (IncorrectOperationException e) { |
| LOG.error(e); |
| } |
| } |
| |
| @Override |
| @NotNull |
| public String getFamilyName() { |
| return InspectionsBundle.message("inspection.data.flow.simplify.boolean.expression.quickfix"); |
| } |
| }; |
| } |
| |
| @NotNull |
| private static LocalQuickFix createSimplifyToAssignmentFix() { |
| return new LocalQuickFix() { |
| @NotNull |
| @Override |
| public String getName() { |
| return InspectionsBundle.message("inspection.data.flow.simplify.to.assignment.quickfix.name"); |
| } |
| |
| @NotNull |
| @Override |
| public String getFamilyName() { |
| return InspectionsBundle.message("inspection.data.flow.simplify.boolean.expression.quickfix"); |
| } |
| |
| @Override |
| public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) { |
| final PsiElement psiElement = descriptor.getPsiElement(); |
| if (psiElement == null) return; |
| |
| final PsiAssignmentExpression assignmentExpression = PsiTreeUtil.getParentOfType(psiElement, PsiAssignmentExpression.class); |
| if (assignmentExpression == null) { |
| return; |
| } |
| |
| final PsiElementFactory factory = JavaPsiFacade.getElementFactory(project); |
| final String lExpressionText = assignmentExpression.getLExpression().getText(); |
| final PsiExpression rExpression = assignmentExpression.getRExpression(); |
| final String rExpressionText = rExpression != null ? rExpression.getText() : ""; |
| assignmentExpression.replace(factory.createExpressionFromText(lExpressionText + " = " + rExpressionText, psiElement)); |
| } |
| }; |
| } |
| |
| private static SimplifyBooleanExpressionFix createIntention(PsiElement element, boolean value) { |
| if (!(element instanceof PsiExpression)) return null; |
| final PsiExpression expression = (PsiExpression)element; |
| while (element.getParent() instanceof PsiExpression) { |
| element = element.getParent(); |
| } |
| final SimplifyBooleanExpressionFix fix = new SimplifyBooleanExpressionFix(expression, value); |
| // simplify intention already active |
| if (!fix.isAvailable() || |
| SimplifyBooleanExpressionFix.canBeSimplified((PsiExpression)element)) { |
| return null; |
| } |
| return fix; |
| } |
| |
| private static class RedundantInstanceofFix implements LocalQuickFix { |
| @Override |
| @NotNull |
| public String getName() { |
| return InspectionsBundle.message("inspection.data.flow.redundant.instanceof.quickfix"); |
| } |
| |
| @Override |
| public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) { |
| if (!FileModificationService.getInstance().preparePsiElementForWrite(descriptor.getPsiElement())) return; |
| final PsiElement psiElement = descriptor.getPsiElement(); |
| if (psiElement instanceof PsiInstanceOfExpression) { |
| try { |
| final PsiExpression compareToNull = JavaPsiFacade.getInstance(psiElement.getProject()).getElementFactory(). |
| createExpressionFromText(((PsiInstanceOfExpression)psiElement).getOperand().getText() + " != null", psiElement.getParent()); |
| psiElement.replace(compareToNull); |
| } |
| catch (IncorrectOperationException e) { |
| LOG.error(e); |
| } |
| } |
| } |
| |
| @Override |
| @NotNull |
| public String getFamilyName() { |
| return getName(); |
| } |
| } |
| |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return InspectionsBundle.message("inspection.data.flow.display.name"); |
| } |
| |
| @Override |
| @NotNull |
| public String getGroupDisplayName() { |
| return GroupNames.BUGS_GROUP_NAME; |
| } |
| |
| @Override |
| @NotNull |
| public String getShortName() { |
| return SHORT_NAME; |
| } |
| |
| private static class DataFlowInstructionVisitor extends StandardInstructionVisitor { |
| private final StandardDataFlowRunner myRunner; |
| |
| private DataFlowInstructionVisitor(StandardDataFlowRunner runner) { |
| myRunner = runner; |
| } |
| |
| @Override |
| protected void onAssigningToNotNullableVariable(AssignInstruction instruction) { |
| myRunner.onAssigningToNotNullableVariable(instruction.getRExpression()); |
| } |
| |
| @Override |
| protected void onNullableReturn(CheckReturnValueInstruction instruction) { |
| myRunner.onNullableReturn(instruction.getReturn()); |
| } |
| |
| @Override |
| protected void onInstructionProducesCCE(TypeCastInstruction instruction) { |
| myRunner.onInstructionProducesCCE(instruction); |
| } |
| |
| @Override |
| protected void onInstructionProducesNPE(Instruction instruction) { |
| if (instruction instanceof MethodCallInstruction && |
| ((MethodCallInstruction)instruction).getMethodType() == MethodCallInstruction.MethodType.UNBOXING) { |
| myRunner.onUnboxingNullable(((MethodCallInstruction)instruction).getContext()); |
| } |
| else { |
| myRunner.onInstructionProducesNPE(instruction); |
| } |
| } |
| |
| @Override |
| protected void onPassingNullParameter(PsiExpression arg) { |
| myRunner.onPassingNullParameter(arg); |
| } |
| |
| @Override |
| protected void onPassingNullParameterToNonAnnotated(DataFlowRunner runner, PsiExpression arg) { |
| myRunner.onPassingNullParameterToNonAnnotated(arg); |
| } |
| } |
| } |
