Introduce CheckerContext and ClassifierUsageCheckerContext

To reduce the number of parameters in classifier usage checker
implementations, and to unify the API with call checkers

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/JvmModuleAccessibilityChecker.kt

@@ -19,7 +19,6 @@ package org.jetbrains.kotlin.resolve.jvm.checkers
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.psi.PsiElement
-import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.diagnostics.Diagnostic
 import org.jetbrains.kotlin.load.java.descriptors.getImplClassNameForDeserialized
@@ -28,14 +27,13 @@ import org.jetbrains.kotlin.load.java.structure.impl.VirtualFileBoundJavaClass
 import org.jetbrains.kotlin.load.kotlin.KotlinJvmBinaryPackageSourceElement
 import org.jetbrains.kotlin.load.kotlin.KotlinJvmBinarySourceElement
 import org.jetbrains.kotlin.load.kotlin.VirtualFileKotlinClass
-import org.jetbrains.kotlin.resolve.BindingTrace
-import org.jetbrains.kotlin.resolve.DeprecationResolver
 import org.jetbrains.kotlin.resolve.DescriptorToSourceUtils
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.calls.checkers.CallChecker
 import org.jetbrains.kotlin.resolve.calls.checkers.CallCheckerContext
 import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
 import org.jetbrains.kotlin.resolve.checkers.ClassifierUsageChecker
+import org.jetbrains.kotlin.resolve.checkers.ClassifierUsageCheckerContext
 import org.jetbrains.kotlin.resolve.jvm.diagnostics.ErrorsJvm.*
 import org.jetbrains.kotlin.resolve.jvm.modules.JavaModuleResolver
 import org.jetbrains.kotlin.resolve.jvm.modules.JavaModuleResolver.AccessError.*
@@ -101,27 +99,21 @@ class JvmModuleAccessibilityChecker(project: Project) : CallChecker {
     }
 
     inner class ClassifierUsage : ClassifierUsageChecker {
-        override fun check(
-                targetDescriptor: ClassifierDescriptor,
-                trace: BindingTrace,
-                element: PsiElement,
-                languageVersionSettings: LanguageVersionSettings,
-                deprecationResolver: DeprecationResolver
-        ) {
+        override fun check(targetDescriptor: ClassifierDescriptor, element: PsiElement, context: ClassifierUsageCheckerContext) {
             val virtualFile = element.containingFile.virtualFile
             when (targetDescriptor) {
                 is ClassDescriptor -> {
-                    diagnosticFor(targetDescriptor, targetDescriptor, virtualFile, element)?.let(trace::report)
+                    diagnosticFor(targetDescriptor, targetDescriptor, virtualFile, element)?.let(context.trace::report)
                 }
                 is TypeAliasDescriptor -> {
                     val containingClassOrPackage = DescriptorUtils.getParentOfType(targetDescriptor, ClassOrPackageFragmentDescriptor::class.java)
                     if (containingClassOrPackage != null) {
-                        diagnosticFor(containingClassOrPackage, targetDescriptor, virtualFile, element)?.let(trace::report)
+                        diagnosticFor(containingClassOrPackage, targetDescriptor, virtualFile, element)?.let(context.trace::report)
                     }
 
                     val expandedClass = targetDescriptor.expandedType.constructor.declarationDescriptor as? ClassDescriptor
                     if (expandedClass != null) {
-                        diagnosticFor(expandedClass, expandedClass, virtualFile, element)?.let(trace::report)
+                        diagnosticFor(expandedClass, expandedClass, virtualFile, element)?.let(context.trace::report)
                     }
                 }
             }

compiler/frontend/src/org/jetbrains/kotlin/resolve/LazyTopDownAnalyzer.kt

@@ -28,6 +28,8 @@ import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowInfo
 import org.jetbrains.kotlin.resolve.checkers.ClassifierUsageChecker
+import org.jetbrains.kotlin.resolve.checkers.ClassifierUsageCheckerContext
+import org.jetbrains.kotlin.resolve.checkers.checkClassifierUsages
 import org.jetbrains.kotlin.resolve.lazy.*
 import org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassDescriptor
 import org.jetbrains.kotlin.resolve.lazy.descriptors.LazyScriptDescriptor
@@ -223,7 +225,10 @@ class LazyTopDownAnalyzer(
 
         resolveImportsInAllFiles(c)
 
-        ClassifierUsageChecker.check(declarations, trace, languageVersionSettings, deprecationResolver, classifierUsageCheckers)
+        checkClassifierUsages(
+            declarations, classifierUsageCheckers,
+            ClassifierUsageCheckerContext(trace, languageVersionSettings, deprecationResolver)
+        )
 
         return c
     }

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/checkers/CallChecker.kt

@@ -23,6 +23,7 @@ import org.jetbrains.kotlin.resolve.DeprecationResolver
 import org.jetbrains.kotlin.resolve.calls.context.ResolutionContext
 import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
 import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowInfo
+import org.jetbrains.kotlin.resolve.checkers.CheckerContext
 import org.jetbrains.kotlin.resolve.scopes.LexicalScope
 import org.jetbrains.kotlin.types.DeferredType
 import org.jetbrains.kotlin.types.KotlinType
@@ -37,10 +38,10 @@ interface CallChecker {
 
 class CallCheckerContext(
     val resolutionContext: ResolutionContext<*>,
-    val trace: BindingTrace,
-    val languageVersionSettings: LanguageVersionSettings,
-    val deprecationResolver: DeprecationResolver
-) {
+    override val trace: BindingTrace,
+    override val languageVersionSettings: LanguageVersionSettings,
+    override val deprecationResolver: DeprecationResolver
+) : CheckerContext {
     val scope: LexicalScope
         get() = resolutionContext.scope
 

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/ApiVersionClassifierUsageChecker.kt

@@ -17,23 +17,16 @@
 package org.jetbrains.kotlin.resolve.checkers
 
 import com.intellij.psi.PsiElement
-import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.descriptors.ClassifierDescriptor
 import org.jetbrains.kotlin.diagnostics.Errors
-import org.jetbrains.kotlin.resolve.BindingTrace
-import org.jetbrains.kotlin.resolve.DeprecationResolver
 import org.jetbrains.kotlin.resolve.checkSinceKotlinVersionAccessibility
 
 object ApiVersionClassifierUsageChecker : ClassifierUsageChecker {
-    override fun check(
-        targetDescriptor: ClassifierDescriptor,
-        trace: BindingTrace,
-        element: PsiElement,
-        languageVersionSettings: LanguageVersionSettings,
-        deprecationResolver: DeprecationResolver
-    ) {
-        targetDescriptor.checkSinceKotlinVersionAccessibility(languageVersionSettings) { version ->
-            trace.report(Errors.API_NOT_AVAILABLE.on(element, version.versionString, languageVersionSettings.apiVersion.versionString))
+    override fun check(targetDescriptor: ClassifierDescriptor, element: PsiElement, context: ClassifierUsageCheckerContext) {
+        targetDescriptor.checkSinceKotlinVersionAccessibility(context.languageVersionSettings) { version ->
+            context.trace.report(
+                Errors.API_NOT_AVAILABLE.on(element, version.versionString, context.languageVersionSettings.apiVersion.versionString)
+            )
         }
     }
 }

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/CheckerContext.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2010-2017 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.
+ */
+
+package org.jetbrains.kotlin.resolve.checkers
+
+import org.jetbrains.kotlin.config.LanguageVersionSettings
+import org.jetbrains.kotlin.resolve.BindingTrace
+import org.jetbrains.kotlin.resolve.DeprecationResolver
+
+interface CheckerContext {
+    val trace: BindingTrace
+
+    val languageVersionSettings: LanguageVersionSettings
+
+    val deprecationResolver: DeprecationResolver
+}

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/ClassifierUsageChecker.kt

@@ -32,77 +32,74 @@ import org.jetbrains.kotlin.resolve.DeprecationResolver
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 
 interface ClassifierUsageChecker {
-    fun check(
-        targetDescriptor: ClassifierDescriptor,
-        trace: BindingTrace,
-        element: PsiElement,
-        languageVersionSettings: LanguageVersionSettings,
-        deprecationResolver: DeprecationResolver
-    )
+    fun check(targetDescriptor: ClassifierDescriptor, element: PsiElement, context: ClassifierUsageCheckerContext)
+}
 
-    companion object {
-        fun check(
-            declarations: Collection<PsiElement>,
-            trace: BindingTrace,
-            languageVersionSettings: LanguageVersionSettings,
-            deprecationResolver: DeprecationResolver,
-            checkers: Iterable<ClassifierUsageChecker>
-        ) {
-            val visitor = object : KtTreeVisitorVoid() {
-                override fun visitReferenceExpression(expression: KtReferenceExpression) {
-                    super.visitReferenceExpression(expression)
+class ClassifierUsageCheckerContext(
+    override val trace: BindingTrace,
+    override val languageVersionSettings: LanguageVersionSettings,
+    override val deprecationResolver: DeprecationResolver
+) : CheckerContext
 
-                    if (expression is KtNameReferenceExpression && expression.getReferencedNameElementType() == KtTokens.SUPER_KEYWORD) {
-                        // Do not run checkers here because super expressions is not a proper expression. For example,
-                        // it doesn't make sense to report deprecation on "super" in "super.foo()" if the super class is deprecated.
-                        return
-                    }
 
-                    val target = getReferencedClassifier(expression) ?: return
+fun checkClassifierUsages(
+    declarations: Collection<PsiElement>,
+    checkers: Iterable<ClassifierUsageChecker>,
+    context: ClassifierUsageCheckerContext
+) {
+    val visitor = object : KtTreeVisitorVoid() {
+        override fun visitReferenceExpression(expression: KtReferenceExpression) {
+            super.visitReferenceExpression(expression)
 
-                    runCheckersWithTarget(target, expression)
-
-                    getReferenceToCompanionViaClassifier(expression, target)?.let { referenceClassifier ->
-                        val outerClass = target.containingDeclaration as ClassDescriptor
-                        runCheckersWithTarget(outerClass, expression)
-                        if (referenceClassifier is TypeAliasDescriptor) {
-                            runCheckersWithTarget(referenceClassifier, expression)
-                        }
-                    }
-                }
-
-                private fun runCheckersWithTarget(target: ClassifierDescriptor, expression: KtReferenceExpression) {
-                    for (checker in checkers) {
-                        checker.check(target, trace, expression, languageVersionSettings, deprecationResolver)
-                    }
-                }
-
-                private fun getReferencedClassifier(expression: KtReferenceExpression): ClassifierDescriptor? {
-                    val target = trace.get(BindingContext.REFERENCE_TARGET, expression) as? ClassifierDescriptor
-                    if (target != null) return target
-
-                    // "Comparable" in "import java.lang.Comparable" references both a class and a SAM constructor and prevents
-                    // REFERENCE_TARGET from being recorded in favor of AMBIGUOUS_REFERENCE_TARGET. But we must still run checkers
-                    // to report if there's something wrong with the class. We characterize this case below by the following properties:
-                    // 1) Exactly one of the references is a classifier
-                    // 2) All references refer to the same source element, i.e. their source is the same
-                    val targets = trace.get(BindingContext.AMBIGUOUS_REFERENCE_TARGET, expression) ?: return null
-                    if (targets.groupBy { (it as? DeclarationDescriptorWithSource)?.source }.size != 1) return null
-                    return targets.filterIsInstance<ClassifierDescriptor>().singleOrNull()
-                }
-
-                private fun getReferenceToCompanionViaClassifier(
-                    expression: KtReferenceExpression,
-                    target: ClassifierDescriptor
-                ): ClassifierDescriptor? {
-                    if (!DescriptorUtils.isCompanionObject(target)) return null
-                    return trace.get(BindingContext.SHORT_REFERENCE_TO_COMPANION_OBJECT, expression)
-                }
+            if (expression is KtNameReferenceExpression && expression.getReferencedNameElementType() == KtTokens.SUPER_KEYWORD) {
+                // Do not run checkers here because super expressions is not a proper expression. For example,
+                // it doesn't make sense to report deprecation on "super" in "super.foo()" if the super class is deprecated.
+                return
             }
 
-            for (declaration in declarations) {
-                declaration.accept(visitor)
+            val target = getReferencedClassifier(expression) ?: return
+
+            runCheckersWithTarget(target, expression)
+
+            getReferenceToCompanionViaClassifier(expression, target)?.let { referenceClassifier ->
+                val outerClass = target.containingDeclaration as ClassDescriptor
+                runCheckersWithTarget(outerClass, expression)
+                if (referenceClassifier is TypeAliasDescriptor) {
+                    runCheckersWithTarget(referenceClassifier, expression)
+                }
             }
         }
+
+        private fun runCheckersWithTarget(target: ClassifierDescriptor, expression: KtReferenceExpression) {
+            for (checker in checkers) {
+                checker.check(target, expression, context)
+            }
+        }
+
+        private fun getReferencedClassifier(expression: KtReferenceExpression): ClassifierDescriptor? {
+            val target = context.trace.get(BindingContext.REFERENCE_TARGET, expression) as? ClassifierDescriptor
+            if (target != null) return target
+
+            // "Comparable" in "import java.lang.Comparable" references both a class and a SAM constructor and prevents
+            // REFERENCE_TARGET from being recorded in favor of AMBIGUOUS_REFERENCE_TARGET. But we must still run checkers
+            // to report if there's something wrong with the class. We characterize this case below by the following properties:
+            // 1) Exactly one of the references is a classifier
+            // 2) All references refer to the same source element, i.e. their source is the same
+            val targets = context.trace.get(BindingContext.AMBIGUOUS_REFERENCE_TARGET, expression) ?: return null
+            if (targets.groupBy { (it as? DeclarationDescriptorWithSource)?.source }.size != 1) return null
+            return targets.filterIsInstance<ClassifierDescriptor>().singleOrNull()
+        }
+
+        private fun getReferenceToCompanionViaClassifier(
+            expression: KtReferenceExpression,
+            target: ClassifierDescriptor
+        ): ClassifierDescriptor? {
+            if (!DescriptorUtils.isCompanionObject(target)) return null
+            return context.trace.get(BindingContext.SHORT_REFERENCE_TO_COMPANION_OBJECT, expression)
+        }
+    }
+
+    for (declaration in declarations) {
+        declaration.accept(visitor)
     }
 }

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/DeprecatedClassifierUsageChecker.kt

@@ -17,24 +17,16 @@
 package org.jetbrains.kotlin.resolve.checkers
 
 import com.intellij.psi.PsiElement
-import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.descriptors.ClassifierDescriptor
 import org.jetbrains.kotlin.psi.KtThisExpression
-import org.jetbrains.kotlin.resolve.BindingTrace
-import org.jetbrains.kotlin.resolve.DeprecationResolver
 import org.jetbrains.kotlin.resolve.createDeprecationDiagnostic
 
 class DeprecatedClassifierUsageChecker : ClassifierUsageChecker {
-    override fun check(
-        targetDescriptor: ClassifierDescriptor,
-        trace: BindingTrace,
-        element: PsiElement,
-        languageVersionSettings: LanguageVersionSettings,
-        deprecationResolver: DeprecationResolver
-    ) {
+    override fun check(targetDescriptor: ClassifierDescriptor, element: PsiElement, context: ClassifierUsageCheckerContext) {
         if (element.parent is KtThisExpression) return
-        for (deprecation in deprecationResolver.getDeprecations(targetDescriptor)) {
-            trace.report(createDeprecationDiagnostic(element, deprecation, languageVersionSettings))
+
+        for (deprecation in context.deprecationResolver.getDeprecations(targetDescriptor)) {
+            context.trace.report(createDeprecationDiagnostic(element, deprecation, context.languageVersionSettings))
         }
     }
 }

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/MissingDependencyClassChecker.kt

@@ -17,12 +17,9 @@
 package org.jetbrains.kotlin.resolve.checkers
 
 import com.intellij.psi.PsiElement
-import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.diagnostics.Diagnostic
 import org.jetbrains.kotlin.diagnostics.Errors.*
-import org.jetbrains.kotlin.resolve.BindingTrace
-import org.jetbrains.kotlin.resolve.DeprecationResolver
 import org.jetbrains.kotlin.resolve.calls.checkers.CallChecker
 import org.jetbrains.kotlin.resolve.calls.checkers.CallCheckerContext
 import org.jetbrains.kotlin.resolve.calls.checkers.isComputingDeferredType
@@ -92,17 +89,11 @@ object MissingDependencyClassChecker : CallChecker {
     }
 
     object ClassifierUsage : ClassifierUsageChecker {
-        override fun check(
-            targetDescriptor: ClassifierDescriptor,
-            trace: BindingTrace,
-            element: PsiElement,
-            languageVersionSettings: LanguageVersionSettings,
-            deprecationResolver: DeprecationResolver
-        ) {
-            diagnosticFor(targetDescriptor, element)?.let(trace::report)
+        override fun check(targetDescriptor: ClassifierDescriptor, element: PsiElement, context: ClassifierUsageCheckerContext) {
+            diagnosticFor(targetDescriptor, element)?.let(context.trace::report)
 
             val containerSource = (targetDescriptor as? DeserializedMemberDescriptor)?.containerSource
-            incompatibilityDiagnosticFor(containerSource, element)?.let(trace::report)
+            incompatibilityDiagnosticFor(containerSource, element)?.let(context.trace::report)
         }
     }
 }