add check for escaped identifiers

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

+/*
+ * Copyright 2010-2015 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.jvm.checkers
+
+import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.diagnostics.DiagnosticSink
+import org.jetbrains.kotlin.diagnostics.Errors
+import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.resolve.IdentifierChecker
+
+object JvmSimpleNameBacktickChecker : IdentifierChecker {
+    // See The Java Virtual Machine Specification, section 4.7.9.1 https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.9.1
+    private val CHARS = setOf('.', ';', '[', ']', '/', '<', '>', ':', '\\')
+
+    override fun checkIdentifier(identifier: PsiElement?, diagnosticHolder: DiagnosticSink) {
+        if (identifier == null) return
+
+        reportIfNeeded(identifier.text, identifier, diagnosticHolder)
+    }
+
+    override fun checkDeclaration(declaration: JetDeclaration, diagnosticHolder: DiagnosticSink) {
+        if (declaration is JetMultiDeclaration) {
+            declaration.entries.forEach { checkNamed(it, diagnosticHolder) }
+        }
+        if (declaration is JetCallableDeclaration) {
+            declaration.valueParameters.forEach { checkNamed(it, diagnosticHolder) }
+        }
+        if (declaration is JetTypeParameterListOwner) {
+            declaration.typeParameters.forEach { checkNamed(it, diagnosticHolder) }
+        }
+        if (declaration is JetNamedDeclaration) {
+            checkNamed(declaration, diagnosticHolder)
+        }
+    }
+
+    fun checkNamed(declaration: JetNamedDeclaration, diagnosticHolder: DiagnosticSink) {
+        val name = declaration.name ?: return
+
+        val element = declaration.nameIdentifier ?: declaration
+        reportIfNeeded(name, element, diagnosticHolder)
+    }
+
+    private fun reportIfNeeded(name: String, element: PsiElement, diagnosticHolder: DiagnosticSink) {
+        val text = JetPsiUtil.unquoteIdentifier(name)
+        if (text.isEmpty()) {
+            diagnosticHolder.report(Errors.INVALID_CHARACTERS.on(element, "should not be empty"))
+        }
+        else if (text.any { it in CHARS }) {
+            diagnosticHolder.report(Errors.INVALID_CHARACTERS.on(element, "contains illegal characters: ${CHARS.intersect(text.toSet()).joinToString("")}"))
+        }
+    }
+}
+

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/platform/JvmPlatformConfigurator.kt

@@ -26,6 +26,7 @@ import org.jetbrains.kotlin.resolve.*
 import org.jetbrains.kotlin.resolve.jvm.checkers.*
 import org.jetbrains.kotlin.types.DynamicTypesSettings
 
+
 public object JvmPlatformConfigurator : PlatformConfigurator(
         DynamicTypesSettings(),
         additionalDeclarationCheckers = listOf(
@@ -60,7 +61,9 @@ public object JvmPlatformConfigurator : PlatformConfigurator(
         additionalAnnotationCheckers = listOf(
                 RepeatableAnnotationChecker,
                 FileClassAnnotationsChecker
-        )
+        ),
+
+        identifierChecker = JvmSimpleNameBacktickChecker
 ) {
 
     override fun configure(container: StorageComponentContainer) {
@@ -69,4 +72,3 @@ public object JvmPlatformConfigurator : PlatformConfigurator(
         container.useImpl<ReflectionAPICallChecker>()
     }
 }
-

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java

@@ -565,6 +565,7 @@ public interface Errors {
     DiagnosticFactory1<JetSimpleNameExpression, JetType> COMPARE_TO_TYPE_MISMATCH = DiagnosticFactory1.create(ERROR);
 
     DiagnosticFactory0<PsiElement> UNDERSCORE_IS_DEPRECATED = DiagnosticFactory0.create(WARNING);
+    DiagnosticFactory1<PsiElement, String> INVALID_CHARACTERS = DiagnosticFactory1.create(ERROR);
 
     DiagnosticFactory0<PsiElement> INAPPLICABLE_OPERATOR_MODIFIER = DiagnosticFactory0.create(WARNING);
     DiagnosticFactory0<PsiElement> INAPPLICABLE_INFIX_MODIFIER = DiagnosticFactory0.create(WARNING);

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java

@@ -377,6 +377,7 @@ public class DefaultErrorMessages {
         MAP.put(COMPARE_TO_TYPE_MISMATCH, "''compareTo()'' must return kotlin.Int, but returns {0}", RENDER_TYPE);
 
         MAP.put(UNDERSCORE_IS_DEPRECATED, "Names _, __, ___, ..., are deprecated");
+        MAP.put(INVALID_CHARACTERS, "Name {0}", STRING);
 
         MAP.put(INAPPLICABLE_OPERATOR_MODIFIER, "'operator' modifier is inapplicable on this function");
         MAP.put(INAPPLICABLE_INFIX_MODIFIER, "'infix' modifier is inapplicable on this function");

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

@@ -16,9 +16,9 @@
 
 package org.jetbrains.kotlin.resolve
 
-import org.jetbrains.kotlin.psi.JetDeclaration
-import org.jetbrains.kotlin.diagnostics.DiagnosticSink
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
+import org.jetbrains.kotlin.diagnostics.DiagnosticSink
+import org.jetbrains.kotlin.psi.JetDeclaration
 
 public interface DeclarationChecker {
 

compiler/frontend/src/org/jetbrains/kotlin/resolve/DeclarationsChecker.java

@@ -48,16 +48,19 @@ public class DeclarationsChecker {
     @NotNull private final ModifiersChecker.ModifiersCheckingProcedure modifiersChecker;
     @NotNull private final DescriptorResolver descriptorResolver;
     @NotNull private final AnnotationChecker annotationChecker;
+    @NotNull private final IdentifierChecker identifierChecker;
 
     public DeclarationsChecker(
             @NotNull DescriptorResolver descriptorResolver,
             @NotNull ModifiersChecker modifiersChecker,
             @NotNull AnnotationChecker annotationChecker,
+            @NotNull IdentifierChecker identifierChecker,
             @NotNull BindingTrace trace
     ) {
         this.descriptorResolver = descriptorResolver;
         this.modifiersChecker = modifiersChecker.withTrace(trace);
         this.annotationChecker = annotationChecker;
+        this.identifierChecker = identifierChecker;
         this.trace = trace;
     }
 
@@ -88,6 +91,7 @@ public class DeclarationsChecker {
             checkPrimaryConstructor(classOrObject, classDescriptor);
 
             modifiersChecker.checkModifiersForDeclaration(classOrObject, classDescriptor);
+            identifierChecker.checkDeclaration(classOrObject, trace);
             checkClassExposedType(classOrObject, classDescriptor);
         }
 
@@ -98,6 +102,7 @@ public class DeclarationsChecker {
 
             checkFunction(function, functionDescriptor);
             modifiersChecker.checkModifiersForDeclaration(function, functionDescriptor);
+            identifierChecker.checkDeclaration(function, trace);
         }
 
         Map<JetProperty, PropertyDescriptor> properties = bodiesResolveContext.getProperties();
@@ -107,6 +112,7 @@ public class DeclarationsChecker {
 
             checkProperty(property, propertyDescriptor);
             modifiersChecker.checkModifiersForDeclaration(property, propertyDescriptor);
+            identifierChecker.checkDeclaration(property, trace);
         }
 
         for (Map.Entry<JetSecondaryConstructor, ConstructorDescriptor> entry : bodiesResolveContext.getSecondaryConstructors().entrySet()) {
@@ -119,6 +125,7 @@ public class DeclarationsChecker {
 
     private void checkConstructorDeclaration(ConstructorDescriptor constructorDescriptor, JetDeclaration declaration) {
         modifiersChecker.checkModifiersForDeclaration(declaration, constructorDescriptor);
+        identifierChecker.checkDeclaration(declaration, trace);
     }
 
     private void checkModifiersAndAnnotationsInPackageDirective(JetFile file) {
@@ -819,6 +826,7 @@ public class DeclarationsChecker {
             PropertyAccessorDescriptor propertyAccessorDescriptor = accessor.isGetter() ? propertyDescriptor.getGetter() : propertyDescriptor.getSetter();
             assert propertyAccessorDescriptor != null : "No property accessor descriptor for " + property.getText();
             modifiersChecker.checkModifiersForDeclaration(accessor, propertyAccessorDescriptor);
+            identifierChecker.checkDeclaration(accessor, trace);
         }
         checkAccessor(propertyDescriptor, property.getGetter(), propertyDescriptor.getGetter());
         checkAccessor(propertyDescriptor, property.getSetter(), propertyDescriptor.getSetter());

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

+/*
+ * Copyright 2010-2015 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
+
+import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.diagnostics.DiagnosticSink
+import org.jetbrains.kotlin.psi.JetDeclaration
+
+public interface IdentifierChecker {
+    fun checkIdentifier(identifier: PsiElement?, diagnosticHolder: DiagnosticSink)
+    fun checkDeclaration(declaration: JetDeclaration, diagnosticHolder: DiagnosticSink)
+
+    object DEFAULT : IdentifierChecker {
+        override fun checkIdentifier(identifier: PsiElement?, diagnosticHolder: DiagnosticSink) {}
+        override fun checkDeclaration(declaration: JetDeclaration, diagnosticHolder: DiagnosticSink) {}
+    }
+}

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

@@ -47,9 +47,11 @@ public class LazyTopDownAnalyzer(
         private val topLevelDescriptorProvider: TopLevelDescriptorProvider,
         private val fileScopeProvider: FileScopeProvider,
         private val declarationScopeProvider: DeclarationScopeProvider,
-        private val qualifiedExpressionResolver: QualifiedExpressionResolver
+        private val qualifiedExpressionResolver: QualifiedExpressionResolver,
+        private val identifierChecker: IdentifierChecker
 ) {
     public fun analyzeDeclarations(topDownAnalysisMode: TopDownAnalysisMode, declarations: Collection<PsiElement>, outerDataFlowInfo: DataFlowInfo): TopDownAnalysisContext {
+
         val c = TopDownAnalysisContext(topDownAnalysisMode, outerDataFlowInfo, declarationScopeProvider)
 
         val topLevelFqNames = HashMultimap.create<FqName, JetElement>()
@@ -93,6 +95,7 @@ public class LazyTopDownAnalyzer(
                 }
 
                 override fun visitPackageDirective(directive: JetPackageDirective) {
+                    directive.packageNames.forEach { identifierChecker.checkIdentifier(it.getIdentifier(), trace) }
                     qualifiedExpressionResolver.resolvePackageHeader(directive, moduleDescriptor, trace)
                 }
 

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

@@ -43,7 +43,7 @@ abstract class TargetPlatform(
         override val builtIns: KotlinBuiltIns
             get() = DefaultBuiltIns.Instance
         override val defaultModuleParameters = ModuleParameters.Empty
-        override val platformConfigurator = PlatformConfigurator(DynamicTypesSettings(), listOf(), listOf(), listOf(), listOf(), listOf())
+        override val platformConfigurator = PlatformConfigurator(DynamicTypesSettings(), listOf(), listOf(), listOf(), listOf(), listOf(), IdentifierChecker.DEFAULT)
     }
 }
 
@@ -65,7 +65,8 @@ open class PlatformConfigurator(
         additionalCallCheckers: List<CallChecker>,
         additionalTypeCheckers: List<AdditionalTypeChecker>,
         additionalSymbolUsageValidators: List<SymbolUsageValidator>,
-        private val additionalAnnotationCheckers: List<AdditionalAnnotationChecker>
+        private val additionalAnnotationCheckers: List<AdditionalAnnotationChecker>,
+        private val identifierChecker: IdentifierChecker
 ) {
 
     private val declarationCheckers: List<DeclarationChecker> = DEFAULT_DECLARATION_CHECKERS + additionalDeclarationCheckers
@@ -81,6 +82,7 @@ open class PlatformConfigurator(
             typeCheckers.forEach { useInstance(it) }
             useInstance(symbolUsageValidator)
             additionalAnnotationCheckers.forEach { useInstance(it) }
+            useInstance(identifierChecker)
         }
     }
 }

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

@@ -52,7 +52,8 @@ public class TypeResolver(
         private val storageManager: StorageManager,
         private val lazinessToken: TypeLazinessToken,
         private val dynamicTypesSettings: DynamicTypesSettings,
-        private val dynamicCallableDescriptors: DynamicCallableDescriptors
+        private val dynamicCallableDescriptors: DynamicCallableDescriptors,
+        private val identifierChecker: IdentifierChecker
 ) {
 
     public open class FlexibleTypeCapabilitiesProvider {
@@ -238,6 +239,7 @@ public class TypeResolver(
 
             override fun visitFunctionType(type: JetFunctionType) {
                 val receiverTypeRef = type.getReceiverTypeReference()
+                type.parameters.forEach { identifierChecker.checkDeclaration(it, c.trace) }
                 val receiverType = if (receiverTypeRef == null) null else resolveType(c.noBareTypes(), receiverTypeRef)
 
                 type.parameters.forEach { checkParameterInFunctionType(it) }

compiler/frontend/src/org/jetbrains/kotlin/types/expressions/ControlStructureTypingVisitor.java

@@ -393,6 +393,7 @@ public class ControlStructureTypingVisitor extends ExpressionTypingVisitor {
         if (loopParameter != null) {
             VariableDescriptor variableDescriptor = createLoopParameterDescriptor(loopParameter, expectedParameterType, context);
             components.modifiersChecker.withTrace(context.trace).checkModifiersForLocalDeclaration(loopParameter, variableDescriptor);
+            components.identifierChecker.checkDeclaration(loopParameter, context.trace);
 
             loopScope.addVariableDescriptor(variableDescriptor);
         }
@@ -406,6 +407,7 @@ public class ControlStructureTypingVisitor extends ExpressionTypingVisitor {
                         loopScope, multiParameter, iteratorNextAsReceiver, loopRange, context
                 );
                 components.modifiersChecker.withTrace(context.trace).checkModifiersForMultiDeclaration(multiParameter);
+                components.identifierChecker.checkDeclaration(multiParameter, context.trace);
             }
         }
 
@@ -473,6 +475,7 @@ public class ControlStructureTypingVisitor extends ExpressionTypingVisitor {
             JetParameter catchParameter = catchClause.getCatchParameter();
             JetExpression catchBody = catchClause.getCatchBody();
             if (catchParameter != null) {
+                components.identifierChecker.checkDeclaration(catchParameter, context.trace);
                 ModifiersChecker.ModifiersCheckingProcedure modifiersChecking = components.modifiersChecker.withTrace(context.trace);
                 modifiersChecking.checkParameterHasNoValOrVar(catchParameter, VAL_OR_VAR_ON_CATCH_PARAMETER);
                 ModifierCheckerCore.INSTANCE$.check(catchParameter, context.trace, null);

compiler/frontend/src/org/jetbrains/kotlin/types/expressions/ExpressionTypingComponents.java

@@ -28,7 +28,6 @@ import org.jetbrains.kotlin.resolve.calls.checkers.CallChecker;
 import org.jetbrains.kotlin.resolve.constants.evaluate.ConstantExpressionEvaluator;
 import org.jetbrains.kotlin.resolve.validation.SymbolUsageValidator;
 import org.jetbrains.kotlin.types.DynamicTypesSettings;
-import org.jetbrains.kotlin.types.TypeIntersector;
 
 import javax.inject.Inject;
 
@@ -55,6 +54,7 @@ public class ExpressionTypingComponents {
     /*package*/ ModifiersChecker modifiersChecker;
     /*package*/ DataFlowAnalyzer dataFlowAnalyzer;
     /*package*/ Iterable<CallChecker> callCheckers;
+    /*package*/ IdentifierChecker identifierChecker;
 
     @Inject
     public void setGlobalContext(@NotNull GlobalContext globalContext) {
@@ -161,6 +161,11 @@ public class ExpressionTypingComponents {
         this.modifiersChecker = modifiersChecker;
     }
 
+    @Inject
+    public void setIdentifierChecker(@NotNull IdentifierChecker identifierChecker) {
+        this.identifierChecker = identifierChecker;
+    }
+
     @Inject
     public void setDataFlowAnalyzer(@NotNull DataFlowAnalyzer dataFlowAnalyzer) {
         this.dataFlowAnalyzer = dataFlowAnalyzer;

compiler/frontend/src/org/jetbrains/kotlin/types/expressions/ExpressionTypingVisitorForStatements.java

@@ -165,6 +165,7 @@ public class ExpressionTypingVisitorForStatements extends ExpressionTypingVisito
 
         scope.addVariableDescriptor(propertyDescriptor);
         components.modifiersChecker.withTrace(context.trace).checkModifiersForLocalDeclaration(property, propertyDescriptor);
+        components.identifierChecker.checkDeclaration(property, context.trace);
         return typeInfo.replaceType(components.dataFlowAnalyzer.checkStatementType(property, context));
     }
 
@@ -185,6 +186,7 @@ public class ExpressionTypingVisitorForStatements extends ExpressionTypingVisito
         }
         components.multiDeclarationResolver.defineLocalVariablesFromMultiDeclaration(scope, multiDeclaration, expressionReceiver, initializer, context);
         components.modifiersChecker.withTrace(context.trace).checkModifiersForMultiDeclaration(multiDeclaration);
+        components.identifierChecker.checkDeclaration(multiDeclaration, context.trace);
         return typeInfo.replaceType(components.dataFlowAnalyzer.checkStatementType(multiDeclaration, context));
     }
 

compiler/frontend/src/org/jetbrains/kotlin/types/expressions/FunctionsTypingVisitor.kt

@@ -106,6 +106,7 @@ public class FunctionsTypingVisitor(facade: ExpressionTypingInternals) : Express
         )
 
         components.modifiersChecker.withTrace(context.trace).checkModifiersForLocalDeclaration(function, functionDescriptor)
+        components.identifierChecker.checkDeclaration(function, context.trace)
         if (!function.hasBody()) {
             context.trace.report(NON_MEMBER_FUNCTION_NO_BODY.on(function, functionDescriptor))
         }
@@ -140,6 +141,7 @@ public class FunctionsTypingVisitor(facade: ExpressionTypingInternals) : Express
         val functionTypeExpected = !noExpectedType(expectedType) && KotlinBuiltIns.isFunctionOrExtensionFunctionType(expectedType)
 
         val functionDescriptor = createFunctionLiteralDescriptor(expression, context)
+        expression.valueParameters.forEach { components.identifierChecker.checkDeclaration(it, context.trace) }
         val safeReturnType = computeReturnType(expression, context, functionDescriptor, functionTypeExpected)
         functionDescriptor.setReturnType(safeReturnType)
 

compiler/testData/diagnostics/tests/BacktickNames.kt

+//  !DIAGNOSTICS: -UNUSED_VARIABLE -UNUSED_PARAMETER
+// TODO Uncomment all the examples when there will be no problems with light classes
+//package `foo.bar`
+
+// TODO: Uncomment after fixing KT-9416
+//import kotlin.Deprecated as `deprecate\entity`
+
+//@`deprecate\entity`("") data class Pair(val x: Int, val y: Int)
+
+// Names should not contains characters: '.', ';', '[', ']', '/', '<', '>', ':', '\\'
+//class `class.name`
+class <!INVALID_CHARACTERS!>`class;name`<!>
+class <!INVALID_CHARACTERS!>`class[name`<!>
+class <!INVALID_CHARACTERS!>`class]name`<!>
+//class `class/name`
+class <!INVALID_CHARACTERS!>`class<name`<!>
+class <!INVALID_CHARACTERS!>`class>name`<!>
+class <!INVALID_CHARACTERS!>`class:name`<!>
+class <!INVALID_CHARACTERS!>`class\name`<!>
+
+class ` ` {}
+class `  `
+
+//val `val.X` = 10
+val <!INVALID_CHARACTERS!>`val;X`<!> = 10
+val <!INVALID_CHARACTERS!>`val[X`<!> = 10
+val <!INVALID_CHARACTERS!>`val]X`<!> = 10
+//val `val/X` = 10
+val <!INVALID_CHARACTERS!>`val<X`<!> = 10
+val <!INVALID_CHARACTERS!>`val>X`<!> = 10
+val <!INVALID_CHARACTERS!>`val:X`<!> = 10
+val <!INVALID_CHARACTERS!>`val\X`<!> = 10
+
+val <!INVALID_CHARACTERS!>`;`<!> = 1
+val <!INVALID_CHARACTERS!>`[`<!> = 2
+val <!INVALID_CHARACTERS!>`]`<!> = 3
+// org.jetbrains.kotlin.resolve.lazy.NoDescriptorForDeclarationException: Descriptor wasn't found for declaration PROPERTY
+// Names which start with '<' are treated as "special": see Name.java
+//val `<` = 4
+
+val <!INVALID_CHARACTERS!>`>`<!> = 5
+val <!INVALID_CHARACTERS!>`:`<!> = 6
+val <!INVALID_CHARACTERS!>`\`<!> = 7
+// org.jetbrains.kotlin.resolve.lazy.NoDescriptorForDeclarationException: Descriptor wasn't found for declaration PROPERTY
+// Names which start with '<' are treated as "special": see Name.java
+//val `<>` = 8
+
+val <!INVALID_CHARACTERS!>`[]`<!> = 9
+val <!INVALID_CHARACTERS!>`[;]`<!> = 10
+
+// TODO Uncomment when there will be no problems with light classes (Error: Invalid formal type parameter (must be a valid Java identifier))
+//class AWithTypeParameter<`T:K`> {}
+//fun <`T/K`> genericFun(x: `T/K`) {}
+
+class B(val <!INVALID_CHARACTERS!>`a:b`<!>: Int, val <!INVALID_CHARACTERS!>`c:d`<!>: Int)
+
+val ff: (<!INVALID_CHARACTERS!>`x:X`<!>: Int) -> Unit = {}
+val fg: ((<!INVALID_CHARACTERS!>`x:X`<!>: Int) -> Unit) -> Unit = {}
+val fh: ((Int) -> ((<!INVALID_CHARACTERS!>`x:X`<!>: Int) -> Unit) -> Unit) = {{}}
+
+fun f(x: Int, g: (Int) -> Unit) = g(x)
+
+data class Data(val x: Int,  val y: Int)
+
+class A() {
+    init {
+        val <!INVALID_CHARACTERS!>`a:b`<!> = 10
+    }
+
+    fun g(<!INVALID_CHARACTERS!>`x:y`<!>: Int) {
+        val <!INVALID_CHARACTERS!>`s:`<!> = 30
+    }
+}
+
+fun <!INVALID_CHARACTERS!>`foo:bar`<!>(<!INVALID_CHARACTERS!>`\arg`<!>: Int): Int {
+    val (<!INVALID_CHARACTERS!>`a:b`<!>, c) = Data(10, 20)
+    val <!INVALID_CHARACTERS!>`a\b`<!> = 10
+
+    fun localFun() {}
+
+    for (<!INVALID_CHARACTERS!>`x/y`<!> in 0..10) {
+    }
+
+    f(10) {
+        <!INVALID_CHARACTERS!>`x:z`<!>: Int -> localFun()
+    }
+
+    f(20, fun(<!INVALID_CHARACTERS!>`x:z`<!>: Int): Unit {})
+
+    try {
+        val <!INVALID_CHARACTERS!>`a:`<!> = 10
+    }
+    catch (<!INVALID_CHARACTERS!>`e:a`<!>: Exception) {
+        val <!INVALID_CHARACTERS!>`b:`<!> = 20
+    }
+
+    return `\arg`
+}
\ No newline at end of file

compiler/testData/diagnostics/tests/BacktickNames.txt

+package
+
+public val `:`: kotlin.Int = 6
+public val `;`: kotlin.Int = 1
+public val `>`: kotlin.Int = 5
+public val `[`: kotlin.Int = 2
+public val `[;]`: kotlin.Int = 10
+public val `[]`: kotlin.Int = 9
+public val `\`: kotlin.Int = 7
+public val `]`: kotlin.Int = 3
+public val ff: (kotlin.Int) -> kotlin.Unit
+public val fg: ((kotlin.Int) -> kotlin.Unit) -> kotlin.Unit
+public val fh: (kotlin.Int) -> ((kotlin.Int) -> kotlin.Unit) -> kotlin.Unit
+public val `val:X`: kotlin.Int = 10
+public val `val;X`: kotlin.Int = 10
+public val `val<X`: kotlin.Int = 10
+public val `val>X`: kotlin.Int = 10
+public val `val[X`: kotlin.Int = 10
+public val `val\X`: kotlin.Int = 10
+public val `val]X`: kotlin.Int = 10
+public fun f(/*0*/ x: kotlin.Int, /*1*/ g: (kotlin.Int) -> kotlin.Unit): kotlin.Unit
+public fun `foo:bar`(/*0*/ `\arg`: kotlin.Int): kotlin.Int
+
+public final class ` ` {
+    public constructor ` `()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class `  ` {
+    public constructor `  `()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class A {
+    public constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun g(/*0*/ `x:y`: kotlin.Int): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class B {
+    public constructor B(/*0*/ `a:b`: kotlin.Int, /*1*/ `c:d`: kotlin.Int)
+    public final val `a:b`: kotlin.Int
+    public final val `c:d`: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+@kotlin.data() public final class Data {
+    public constructor Data(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.Int)
+    public final val x: kotlin.Int
+    public final val y: kotlin.Int
+    public final operator /*synthesized*/ fun component1(): kotlin.Int
+    public final operator /*synthesized*/ fun component2(): kotlin.Int
+    public final /*synthesized*/ fun copy(/*0*/ x: kotlin.Int = ..., /*1*/ y: kotlin.Int = ...): Data
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class `class:name` {
+    public constructor `class:name`()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class `class;name` {
+    public constructor `class;name`()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class `class<name` {
+    public constructor `class<name`()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class `class>name` {
+    public constructor `class>name`()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class `class[name` {
+    public constructor `class[name`()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class `class\name` {
+    public constructor `class\name`()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class `class]name` {
+    public constructor `class]name`()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/tests/org/jetbrains/kotlin/checkers/JetDiagnosticsTestGenerated.java

@@ -91,6 +91,12 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
             doTest(fileName);
         }
 
+        @TestMetadata("BacktickNames.kt")
+        public void testBacktickNames() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/BacktickNames.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("Basic.kt")
         public void testBasic() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/Basic.kt");

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/JsPlatformConfigurator.kt

@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.js.resolve
 import org.jetbrains.kotlin.container.StorageComponentContainer
 import org.jetbrains.kotlin.container.useImpl
 import org.jetbrains.kotlin.js.resolve.diagnostics.JsCallChecker
+import org.jetbrains.kotlin.resolve.IdentifierChecker
 import org.jetbrains.kotlin.resolve.PlatformConfigurator
 import org.jetbrains.kotlin.types.DynamicTypesAllowed
 
@@ -28,7 +29,8 @@ public object JsPlatformConfigurator : PlatformConfigurator(
         additionalCallCheckers = listOf(),
         additionalTypeCheckers = listOf(),
         additionalSymbolUsageValidators = listOf(),
-        additionalAnnotationCheckers = listOf()
+        additionalAnnotationCheckers = listOf(),
+        identifierChecker = IdentifierChecker.DEFAULT
 ) {
     override fun configure(container: StorageComponentContainer) {
         super.configure(container)