Move static function type utilities from KotlinBuiltIns to functionTypes.kt

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

@@ -24,6 +24,7 @@ import kotlin.Unit;
 import kotlin.jvm.functions.Function1;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.kotlin.builtins.FunctionTypesKt;
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
 import org.jetbrains.kotlin.descriptors.*;
 import org.jetbrains.kotlin.descriptors.impl.SyntheticFieldDescriptor;
@@ -443,7 +444,7 @@ public class BodyResolver {
             if (classDescriptor != null) {
                 if (ErrorUtils.isError(classDescriptor)) continue;
 
-                if (KotlinBuiltIns.isExactExtensionFunctionType(supertype)) {
+                if (FunctionTypesKt.isExactExtensionFunctionType(supertype)) {
                     trace.report(SUPERTYPE_IS_EXTENSION_FUNCTION_TYPE.on(typeReference));
                 }
 

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

@@ -27,6 +27,7 @@ import kotlin.jvm.functions.Function0;
 import kotlin.jvm.functions.Function1;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.kotlin.builtins.FunctionTypesKt;
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
 import org.jetbrains.kotlin.descriptors.*;
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationSplitter;
@@ -611,7 +612,7 @@ public class DescriptorResolver {
         if (DynamicTypesKt.isDynamic(upperBoundType)) {
             trace.report(DYNAMIC_UPPER_BOUND.on(upperBound));
         }
-        if (KotlinBuiltIns.isExactExtensionFunctionType(upperBoundType)) {
+        if (FunctionTypesKt.isExactExtensionFunctionType(upperBoundType)) {
             trace.report(UPPER_BOUND_IS_EXTENSION_FUNCTION_TYPE.on(upperBound));
         }
     }

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

@@ -17,6 +17,9 @@
 package org.jetbrains.kotlin.resolve
 
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.getReceiverTypeFromFunctionType
+import org.jetbrains.kotlin.builtins.getValueParametersFromFunctionType
+import org.jetbrains.kotlin.builtins.isFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.descriptors.impl.ConstructorDescriptorImpl
@@ -217,12 +220,12 @@ class FunctionDescriptorResolver(
         )
     }
 
-    private fun KotlinType.functionTypeExpected() = !TypeUtils.noExpectedType(this) && KotlinBuiltIns.isFunctionOrExtensionFunctionType(this)
+    private fun KotlinType.functionTypeExpected() = !TypeUtils.noExpectedType(this) && isFunctionOrExtensionFunctionType
     private fun KotlinType.getReceiverType(): KotlinType? =
-            if (functionTypeExpected()) KotlinBuiltIns.getReceiverType(this) else null
+            if (functionTypeExpected()) getReceiverTypeFromFunctionType(this) else null
 
     private fun KotlinType.getValueParameters(owner: FunctionDescriptor): List<ValueParameterDescriptor>? =
-            if (functionTypeExpected()) KotlinBuiltIns.getValueParameters(owner, this) else null
+            if (functionTypeExpected()) getValueParametersFromFunctionType(owner, this) else null
 
     fun resolvePrimaryConstructorDescriptor(
             scope: LexicalScope,

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

@@ -16,7 +16,7 @@
 
 package org.jetbrains.kotlin.resolve
 
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.diagnostics.DiagnosticSink
 import org.jetbrains.kotlin.diagnostics.Errors
@@ -27,16 +27,14 @@ import org.jetbrains.kotlin.psi.KtFunction
 import org.jetbrains.kotlin.psi.KtParameter
 
 object InlineParameterChecker : DeclarationChecker {
-    override fun check(declaration: KtDeclaration,
+    override fun check(
-                       descriptor: DeclarationDescriptor,
+            declaration: KtDeclaration, descriptor: DeclarationDescriptor, diagnosticHolder: DiagnosticSink, bindingContext: BindingContext
-                       diagnosticHolder: DiagnosticSink,
-                       bindingContext: BindingContext
     ) {
         if (declaration is KtFunction) {
             val inline = declaration.hasModifier(KtTokens.INLINE_KEYWORD)
             for (parameter in declaration.valueParameters) {
                 val parameterDescriptor = bindingContext.get(BindingContext.VALUE_PARAMETER, parameter)
-                if (!inline || (parameterDescriptor != null && !KotlinBuiltIns.isFunctionOrExtensionFunctionType(parameterDescriptor.type))) {
+                if (!inline || (parameterDescriptor != null && !parameterDescriptor.type.isFunctionOrExtensionFunctionType)) {
                     parameter.reportIncorrectInline(KtTokens.NOINLINE_KEYWORD, diagnosticHolder)
                     parameter.reportIncorrectInline(KtTokens.CROSSINLINE_KEYWORD, diagnosticHolder)
                 }

compiler/frontend/src/org/jetbrains/kotlin/resolve/callableReferences/CallableReferencesResolutionUtils.kt

@@ -16,8 +16,7 @@
 
 package org.jetbrains.kotlin.resolve.callableReferences
 
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.*
-import org.jetbrains.kotlin.builtins.ReflectionTypes
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.descriptors.impl.AnonymousFunctionDescriptor
@@ -211,11 +210,11 @@ private fun bindFunctionReference(expression: KtCallableReferenceExpression, typ
     )
 
     functionDescriptor.initialize(
-            KotlinBuiltIns.getReceiverType(type),
+            getReceiverTypeFromFunctionType(type),
             null,
             emptyList(),
-            KotlinBuiltIns.getValueParameters(functionDescriptor, type),
+            getValueParametersFromFunctionType(functionDescriptor, type),
-            KotlinBuiltIns.getReturnTypeFromFunctionType(type),
+            getReturnTypeFromFunctionType(type),
             Modality.FINAL,
             Visibilities.PUBLIC
     )

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/CandidateResolver.kt

@@ -18,8 +18,8 @@ package org.jetbrains.kotlin.resolve.calls
 
 import com.google.common.collect.Lists
 import com.google.common.collect.Sets
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.builtins.ReflectionTypes
+import org.jetbrains.kotlin.builtins.isExactExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.diagnostics.Errors
 import org.jetbrains.kotlin.diagnostics.Errors.SUPER_CANT_BE_EXTENSION_RECEIVER
@@ -276,12 +276,11 @@ class CandidateResolver(
 
     private fun CallCandidateResolutionContext<*>.checkNonExtensionCalledWithReceiver() = checkAndReport {
         val call = candidateCall.call
-        if (call is CallTransformer.CallForImplicitInvoke && candidateCall.extensionReceiver != null
+        if (call is CallTransformer.CallForImplicitInvoke &&
-                && candidateCall.dispatchReceiver != null
+            candidateCall.extensionReceiver != null &&
+            candidateCall.dispatchReceiver != null
         ) {
-            if (call.dispatchReceiver == candidateCall.dispatchReceiver
+            if (call.dispatchReceiver == candidateCall.dispatchReceiver && !call.dispatchReceiver.type.isExactExtensionFunctionType) {
-                    && !KotlinBuiltIns.isExactExtensionFunctionType(call.dispatchReceiver.type)
-            ) {
                 tracing.nonExtensionFunctionCalledAsExtension(trace)
                 return@checkAndReport OTHER_ERROR
             }

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/GenericCandidateResolver.kt

@@ -16,8 +16,8 @@
 
 package org.jetbrains.kotlin.resolve.calls
 
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.builtins.ReflectionTypes
+import org.jetbrains.kotlin.builtins.isFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
 import org.jetbrains.kotlin.descriptors.ValueParameterDescriptor
@@ -238,11 +238,10 @@ class GenericCandidateResolver(private val argumentTypeResolver: ArgumentTypeRes
     ) = if (!TypeUtils.noExpectedType(context.expectedType) &&
             ownerReturnType != null &&
             TypeUtils.isTypeParameter(ownerReturnType) &&
-            KotlinBuiltIns.isFunctionOrExtensionFunctionType(literalExpectedType) &&
+            literalExpectedType.isFunctionOrExtensionFunctionType &&
             getReturnTypeForCallable(literalExpectedType) == ownerReturnType)
-
+        context.expectedType
-             context.expectedType
+    else DONT_CARE
-        else DONT_CARE
 
     private fun <D : CallableDescriptor> addConstraintForFunctionLiteralArgument(
             functionLiteral: KtFunction,
@@ -259,8 +258,7 @@ class GenericCandidateResolver(private val argumentTypeResolver: ArgumentTypeRes
         if (expectedType == null || TypeUtils.isDontCarePlaceholder(expectedType)) {
             expectedType = argumentTypeResolver.getShapeTypeOfFunctionLiteral(functionLiteral, context.scope, context.trace, false)
         }
-        if (expectedType == null || !KotlinBuiltIns.isFunctionOrExtensionFunctionType(expectedType) ||
+        if (expectedType == null || !expectedType.isFunctionOrExtensionFunctionType || hasUnknownFunctionParameter(expectedType)) {
-            hasUnknownFunctionParameter(expectedType)) {
             return
         }
         val dataFlowInfoForArguments = context.candidateCall.dataFlowInfoForArguments
@@ -330,7 +328,7 @@ class GenericCandidateResolver(private val argumentTypeResolver: ArgumentTypeRes
             return substitutedType
 
         val shapeType = argumentTypeResolver.getShapeTypeOfCallableReference(callableReference, context, false)
-        if (shapeType != null && KotlinBuiltIns.isFunctionOrExtensionFunctionType(shapeType) && !hasUnknownFunctionParameter(shapeType))
+        if (shapeType != null && shapeType.isFunctionOrExtensionFunctionType && !hasUnknownFunctionParameter(shapeType))
             return shapeType
 
         return null

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/checkers/InlineChecker.java

@@ -19,7 +19,7 @@ package org.jetbrains.kotlin.resolve.calls.checkers;
 import com.intellij.psi.PsiElement;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
+import org.jetbrains.kotlin.builtins.FunctionTypesKt;
 import org.jetbrains.kotlin.descriptors.*;
 import org.jetbrains.kotlin.diagnostics.Errors;
 import org.jetbrains.kotlin.lexer.KtToken;
@@ -232,9 +232,10 @@ class InlineChecker implements CallChecker {
         }
 
         DeclarationDescriptor containingDeclaration = descriptor.getContainingDeclaration();
-        boolean isInvoke = descriptor.getName().equals(OperatorNameConventions.INVOKE) &&
+        boolean isInvoke =
-                           containingDeclaration instanceof ClassDescriptor &&
+                descriptor.getName().equals(OperatorNameConventions.INVOKE) &&
-                           KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(((ClassDescriptor) containingDeclaration).getDefaultType());
+                containingDeclaration instanceof ClassDescriptor &&
+                FunctionTypesKt.isExactFunctionOrExtensionFunctionType(((ClassDescriptor) containingDeclaration).getDefaultType());
 
         return isInvoke || InlineUtil.isInline(descriptor);
     }

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

@@ -16,7 +16,7 @@
 
 package org.jetbrains.kotlin.resolve.calls.checkers
 
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExactExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.diagnostics.Errors
 import org.jetbrains.kotlin.resolve.calls.context.BasicCallResolutionContext
@@ -29,7 +29,8 @@ class InvokeConventionChecker : CallChecker {
         if (resolvedCall is VariableAsFunctionResolvedCallImpl) {
             val functionCall = resolvedCall.functionCall
             val variableCall = resolvedCall.variableCall
-            if (functionCall.dispatchReceiver != null && functionCall.extensionReceiver != null && KotlinBuiltIns.isExactExtensionFunctionType(variableCall.resultingDescriptor.type)) {
+            if (functionCall.dispatchReceiver != null && functionCall.extensionReceiver != null &&
+                variableCall.resultingDescriptor.type.isExactExtensionFunctionType) {
                 if (variableCall.dispatchReceiver is ExpressionReceiver || variableCall.extensionReceiver is ExpressionReceiver) {
                     val callElement = variableCall.call.callElement
                     context.trace.report(Errors.INVOKE_ON_EXTENSION_FUNCTION_WITH_EXPLICIT_DISPATCH_RECEIVER.on(callElement))
@@ -37,5 +38,4 @@ class InvokeConventionChecker : CallChecker {
             }
         }
     }
-
 }

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/inference/ConstraintSystemBuilderImpl.kt

@@ -16,7 +16,7 @@
 
 package org.jetbrains.kotlin.resolve.calls.inference
 
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.resolve.calls.inference.ConstraintSystemBuilderImpl.ConstraintKind.EQUAL
@@ -419,7 +419,7 @@ internal fun createTypeForFunctionPlaceholder(
 
     val functionPlaceholderTypeConstructor = functionPlaceholder.constructor as FunctionPlaceholderTypeConstructor
 
-    val isExtension = KotlinBuiltIns.isExtensionFunctionType(expectedType)
+    val isExtension = expectedType.isExtensionFunctionType
     val newArgumentTypes = if (!functionPlaceholderTypeConstructor.hasDeclaredArguments) {
         val typeParamSize = expectedType.constructor.parameters.size
         // the first parameter is receiver (if present), the last one is return type,

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/tasks/TracingStrategyForInvoke.java

@@ -18,7 +18,7 @@ package org.jetbrains.kotlin.resolve.calls.tasks;
 
 import com.intellij.psi.PsiElement;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
+import org.jetbrains.kotlin.builtins.FunctionTypesKt;
 import org.jetbrains.kotlin.descriptors.CallableDescriptor;
 import org.jetbrains.kotlin.psi.Call;
 import org.jetbrains.kotlin.psi.KtExpression;
@@ -87,7 +87,7 @@ public class TracingStrategyForInvoke extends AbstractTracingStrategy {
     }
 
     private void functionExpectedOrNoReceiverAllowed(BindingTrace trace) {
-        if (KotlinBuiltIns.isFunctionType(calleeType)) {
+        if (FunctionTypesKt.isFunctionType(calleeType)) {
             trace.report(NO_RECEIVER_ALLOWED.on(reference));
         }
         else {

compiler/frontend/src/org/jetbrains/kotlin/resolve/inline/InlineUtil.java

@@ -20,6 +20,7 @@ import com.intellij.psi.PsiElement;
 import com.intellij.psi.util.PsiTreeUtil;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.kotlin.builtins.FunctionTypesKt;
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
 import org.jetbrains.kotlin.descriptors.*;
 import org.jetbrains.kotlin.psi.*;
@@ -35,7 +36,7 @@ public class InlineUtil {
     public static boolean isInlineLambdaParameter(@NotNull ParameterDescriptor valueParameterOrReceiver) {
         return !(valueParameterOrReceiver instanceof ValueParameterDescriptor
                  && ((ValueParameterDescriptor) valueParameterOrReceiver).isNoinline()) &&
-               KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(valueParameterOrReceiver.getOriginal().getType());
+               FunctionTypesKt.isExactFunctionOrExtensionFunctionType(valueParameterOrReceiver.getOriginal().getType());
     }
 
     public static boolean isInline(@Nullable DeclarationDescriptor descriptor) {

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

@@ -19,6 +19,8 @@ package org.jetbrains.kotlin.types.expressions
 import com.google.common.collect.Lists
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.getReturnTypeFromFunctionType
+import org.jetbrains.kotlin.builtins.isFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor
 import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
@@ -142,7 +144,7 @@ internal class FunctionsTypingVisitor(facade: ExpressionTypingInternals) : Expre
         if (!expression.functionLiteral.hasBody()) return null
 
         val expectedType = context.expectedType
-        val functionTypeExpected = !noExpectedType(expectedType) && KotlinBuiltIns.isFunctionOrExtensionFunctionType(expectedType)
+        val functionTypeExpected = !noExpectedType(expectedType) && expectedType.isFunctionOrExtensionFunctionType
 
         val functionDescriptor = createFunctionLiteralDescriptor(expression, context)
         expression.valueParameters.forEach {
@@ -191,7 +193,7 @@ internal class FunctionsTypingVisitor(facade: ExpressionTypingInternals) : Expre
             functionDescriptor: SimpleFunctionDescriptorImpl,
             functionTypeExpected: Boolean
     ): KotlinType {
-        val expectedReturnType = if (functionTypeExpected) KotlinBuiltIns.getReturnTypeFromFunctionType(context.expectedType) else null
+        val expectedReturnType = if (functionTypeExpected) getReturnTypeFromFunctionType(context.expectedType) else null
         val returnType = computeUnsafeReturnType(expression, context, functionDescriptor, expectedReturnType);
 
         if (!expression.functionLiteral.hasDeclaredReturnType() && functionTypeExpected) {

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/tower/InvokeProcessors.kt

@@ -16,7 +16,7 @@
 
 package org.jetbrains.kotlin.resolve.calls.tower
 
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExactExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.resolve.calls.tasks.ExplicitReceiverKind
 import org.jetbrains.kotlin.resolve.calls.tasks.createSynthesizedInvokes
@@ -141,7 +141,7 @@ private class InvokeExtensionScopeTowerProcessor<C>(
 private fun ScopeTower.getExtensionInvokeCandidateDescriptor(
         extensionFunctionReceiver: ReceiverValue
 ): CandidateWithBoundDispatchReceiver<FunctionDescriptor>? {
-    if (!KotlinBuiltIns.isExactExtensionFunctionType(extensionFunctionReceiver.type)) return null
+    if (!extensionFunctionReceiver.type.isExactExtensionFunctionType) return null
 
     val invokeDescriptor = extensionFunctionReceiver.type.memberScope.getContributedFunctions(OperatorNameConventions.INVOKE, location).single()
     val synthesizedInvoke = createSynthesizedInvokes(listOf(invokeDescriptor)).single()

core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java

@@ -815,10 +815,6 @@ public abstract class KotlinBuiltIns {
                                             Collections.<ValueParameterDescriptor, ConstantValue<?>>emptyMap(), SourceElement.NO_SOURCE);
     }
 
-    private static boolean isTypeAnnotatedWithExtension(@NotNull KotlinType type) {
-        return type.getAnnotations().findAnnotation(FQ_NAMES.extensionFunctionType) != null;
-    }
-
     @NotNull
     public KotlinType getFunctionType(
             @NotNull Annotations annotations,
@@ -892,111 +888,6 @@ public abstract class KotlinBuiltIns {
         return getPrimitiveTypeByFqName(getFqName(descriptor)) != null;
     }
 
-    // Functions
-
-    public static boolean isFunctionOrExtensionFunctionType(@NotNull KotlinType type) {
-        return isFunctionType(type) || isExtensionFunctionType(type);
-    }
-
-    public static boolean isFunctionType(@NotNull KotlinType type) {
-        if (isExactFunctionType(type)) return true;
-
-        for (KotlinType superType : type.getConstructor().getSupertypes()) {
-            if (isFunctionType(superType)) return true;
-        }
-
-        return false;
-    }
-
-    public static boolean isExtensionFunctionType(@NotNull KotlinType type) {
-        if (isExactExtensionFunctionType(type)) return true;
-
-        for (KotlinType superType : type.getConstructor().getSupertypes()) {
-            if (isExtensionFunctionType(superType)) return true;
-        }
-
-        return false;
-    }
-
-    public static boolean isExactFunctionOrExtensionFunctionType(@NotNull KotlinType type) {
-        ClassifierDescriptor descriptor = type.getConstructor().getDeclarationDescriptor();
-        return descriptor != null && isNumberedFunctionClassFqName(getFqName(descriptor));
-    }
-
-    public static boolean isExactFunctionType(@NotNull KotlinType type) {
-        return isExactFunctionOrExtensionFunctionType(type) && !isTypeAnnotatedWithExtension(type);
-    }
-
-    public static boolean isExactExtensionFunctionType(@NotNull KotlinType type) {
-        return isExactFunctionOrExtensionFunctionType(type) && isTypeAnnotatedWithExtension(type);
-    }
-
-    /**
-     * @return true if this is an FQ name of a fictitious class representing the function type,
-     * e.g. kotlin.Function1 (but NOT kotlin.reflect.KFunction1)
-     */
-    public static boolean isNumberedFunctionClassFqName(@NotNull FqNameUnsafe fqName) {
-        List<Name> segments = fqName.pathSegments();
-        if (segments.size() != 2) return false;
-
-        if (!BUILT_INS_PACKAGE_NAME.equals(first(segments))) return false;
-
-        String shortName = last(segments).asString();
-        return BuiltInFictitiousFunctionClassFactory.isFunctionClassName(shortName, BUILT_INS_PACKAGE_FQ_NAME);
-    }
-
-    @Nullable
-    public static KotlinType getReceiverType(@NotNull KotlinType type) {
-        assert isFunctionOrExtensionFunctionType(type) : type;
-        if (isExtensionFunctionType(type)) {
-            // TODO: this is incorrect when a class extends from an extension function and swaps type arguments
-            return type.getArguments().get(0).getType();
-        }
-        return null;
-    }
-
-    @NotNull
-    public static List<ValueParameterDescriptor> getValueParameters(@NotNull FunctionDescriptor functionDescriptor, @NotNull KotlinType type) {
-        assert isFunctionOrExtensionFunctionType(type);
-        List<TypeProjection> parameterTypes = getParameterTypeProjectionsFromFunctionType(type);
-        List<ValueParameterDescriptor> valueParameters = new ArrayList<ValueParameterDescriptor>(parameterTypes.size());
-        for (int i = 0; i < parameterTypes.size(); i++) {
-            TypeProjection parameterType = parameterTypes.get(i);
-            ValueParameterDescriptorImpl valueParameterDescriptor = new ValueParameterDescriptorImpl(
-                    functionDescriptor, null, i, Annotations.Companion.getEMPTY(),
-                    Name.identifier("p" + (i + 1)), parameterType.getType(),
-                    /* declaresDefaultValue = */ false,
-                    /* isCrossinline = */ false,
-                    /* isNoinline = */ false,
-                    null, SourceElement.NO_SOURCE
-            );
-            valueParameters.add(valueParameterDescriptor);
-        }
-        return valueParameters;
-    }
-
-    @NotNull
-    public static KotlinType getReturnTypeFromFunctionType(@NotNull KotlinType type) {
-        assert isFunctionOrExtensionFunctionType(type);
-        List<TypeProjection> arguments = type.getArguments();
-        return arguments.get(arguments.size() - 1).getType();
-    }
-
-    @NotNull
-    public static List<TypeProjection> getParameterTypeProjectionsFromFunctionType(@NotNull KotlinType type) {
-        assert isFunctionOrExtensionFunctionType(type);
-        List<TypeProjection> arguments = type.getArguments();
-        int first = isExtensionFunctionType(type) ? 1 : 0;
-        int last = arguments.size() - 2;
-        // TODO: fix bugs associated with this here and in neighboring methods, see KT-9820
-        assert first <= last + 1 : "Not an exact function type: " + type;
-        List<TypeProjection> parameterTypes = new ArrayList<TypeProjection>(last - first + 1);
-        for (int i = first; i <= last; i++) {
-            parameterTypes.add(arguments.get(i));
-        }
-        return parameterTypes;
-    }
-
     private static boolean isConstructedFromGivenClass(@NotNull KotlinType type, @NotNull FqNameUnsafe fqName) {
         ClassifierDescriptor descriptor = type.getConstructor().getDeclarationDescriptor();
         return descriptor instanceof ClassDescriptor && classFqNameEquals(descriptor, fqName);

core/descriptors/src/org/jetbrains/kotlin/builtins/ReflectionTypes.kt

@@ -117,7 +117,7 @@ class ReflectionTypes(private val module: ModuleDescriptor) {
         }
 
         fun isCallableType(type: KotlinType): Boolean =
-                KotlinBuiltIns.isFunctionOrExtensionFunctionType(type) || isKCallableType(type)
+                type.isFunctionOrExtensionFunctionType || isKCallableType(type)
 
         private fun isKCallableType(type: KotlinType): Boolean =
                 isExactKCallableType(type) ||

core/descriptors/src/org/jetbrains/kotlin/builtins/functionTypes.kt

@@ -0,0 +1,110 @@
+/*
+ * Copyright 2010-2016 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.builtins
+
+import org.jetbrains.kotlin.builtins.functions.BuiltInFictitiousFunctionClassFactory
+import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.descriptors.SourceElement
+import org.jetbrains.kotlin.descriptors.ValueParameterDescriptor
+import org.jetbrains.kotlin.descriptors.annotations.Annotations
+import org.jetbrains.kotlin.descriptors.impl.ValueParameterDescriptorImpl
+import org.jetbrains.kotlin.name.FqNameUnsafe
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameUnsafe
+import org.jetbrains.kotlin.types.KotlinType
+import org.jetbrains.kotlin.types.TypeProjection
+import java.util.*
+
+val KotlinType.isFunctionOrExtensionFunctionType: Boolean
+    get() = isFunctionType || isExtensionFunctionType
+
+val KotlinType.isFunctionType: Boolean
+    get() = isExactFunctionType || constructor.supertypes.any(KotlinType::isFunctionType)
+
+val KotlinType.isExtensionFunctionType: Boolean
+    get() = isExactExtensionFunctionType || constructor.supertypes.any(KotlinType::isExtensionFunctionType)
+
+val KotlinType.isExactFunctionOrExtensionFunctionType: Boolean
+    get() {
+        val descriptor = constructor.declarationDescriptor
+        return descriptor != null && isNumberedFunctionClassFqName(descriptor.fqNameUnsafe)
+    }
+
+val KotlinType.isExactFunctionType: Boolean
+    get() = isExactFunctionOrExtensionFunctionType && !isTypeAnnotatedWithExtension
+
+val KotlinType.isExactExtensionFunctionType: Boolean
+    get() = isExactFunctionOrExtensionFunctionType && isTypeAnnotatedWithExtension
+
+private val KotlinType.isTypeAnnotatedWithExtension: Boolean
+    get() = annotations.findAnnotation(KotlinBuiltIns.FQ_NAMES.extensionFunctionType) != null
+
+/**
+ * @return true if this is an FQ name of a fictitious class representing the function type,
+ * e.g. kotlin.Function1 (but NOT kotlin.reflect.KFunction1)
+ */
+fun isNumberedFunctionClassFqName(fqName: FqNameUnsafe): Boolean {
+    val segments = fqName.pathSegments()
+    if (segments.size != 2) return false
+
+    if (KotlinBuiltIns.BUILT_INS_PACKAGE_NAME != segments.first()) return false
+
+    val shortName = segments.last().asString()
+    return BuiltInFictitiousFunctionClassFactory.isFunctionClassName(shortName, KotlinBuiltIns.BUILT_INS_PACKAGE_FQ_NAME)
+}
+
+fun getReceiverTypeFromFunctionType(type: KotlinType): KotlinType? {
+    assert(type.isFunctionOrExtensionFunctionType) { type }
+    if (type.isExtensionFunctionType) {
+        // TODO: this is incorrect when a class extends from an extension function and swaps type arguments
+        return type.arguments[0].type
+    }
+    return null
+}
+
+fun getValueParametersFromFunctionType(functionDescriptor: FunctionDescriptor, type: KotlinType): List<ValueParameterDescriptor> {
+    assert(type.isFunctionOrExtensionFunctionType) { type }
+    return getParameterTypeProjectionsFromFunctionType(type).mapIndexed { i, typeProjection ->
+        ValueParameterDescriptorImpl(
+                functionDescriptor, null, i, Annotations.EMPTY,
+                Name.identifier("p${i + 1}"), typeProjection.type,
+                /* declaresDefaultValue = */ false,
+                /* isCrossinline = */ false,
+                /* isNoinline = */ false,
+                null, SourceElement.NO_SOURCE
+        )
+    }
+}
+
+fun getReturnTypeFromFunctionType(type: KotlinType): KotlinType {
+    assert(type.isFunctionOrExtensionFunctionType) { type }
+    return type.arguments.last().type
+}
+
+fun getParameterTypeProjectionsFromFunctionType(type: KotlinType): List<TypeProjection> {
+    assert(type.isFunctionOrExtensionFunctionType) { type }
+    val arguments = type.arguments
+    val first = if (type.isExtensionFunctionType) 1 else 0
+    val last = arguments.size - 2
+    // TODO: fix bugs associated with this here and in neighboring methods, see KT-9820
+    assert(first <= last + 1) { "Not an exact function type: $type" }
+    val parameterTypes = ArrayList<TypeProjection>(last - first + 1)
+    for (i in first..last) {
+        parameterTypes.add(arguments[i])
+    }
+    return parameterTypes
+}

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt

@@ -16,7 +16,7 @@
 
 package org.jetbrains.kotlin.renderer
 
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.*
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.Annotated
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
@@ -183,7 +183,7 @@ internal class DescriptorRendererImpl(
     }
 
     private fun shouldRenderAsPrettyFunctionType(type: KotlinType): Boolean {
-        return KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(type) && type.arguments.none { it.isStarProjection }
+        return type.isExactFunctionOrExtensionFunctionType && type.arguments.none { it.isStarProjection }
     }
 
     private fun renderFlexibleType(type: KotlinType): String {
@@ -305,7 +305,7 @@ internal class DescriptorRendererImpl(
             val isNullable = type.isMarkedNullable
             if (isNullable) append("(")
 
-            val receiverType = KotlinBuiltIns.getReceiverType(type)
+            val receiverType = getReceiverTypeFromFunctionType(type)
             if (receiverType != null) {
                 val surroundReceiver = shouldRenderAsPrettyFunctionType(receiverType) && !receiverType.isMarkedNullable
                 if (surroundReceiver) {
@@ -319,9 +319,9 @@ internal class DescriptorRendererImpl(
             }
 
             append("(")
-            appendTypeProjections(KotlinBuiltIns.getParameterTypeProjectionsFromFunctionType(type), this)
+            appendTypeProjections(getParameterTypeProjectionsFromFunctionType(type), this)
             append(") ").append(arrow()).append(" ")
-            append(renderNormalizedType(KotlinBuiltIns.getReturnTypeFromFunctionType(type)))
+            append(renderNormalizedType(getReturnTypeFromFunctionType(type)))
 
             if (isNullable) append(")?")
         }

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/stubBuilder/ClassClsStubBuilder.kt

@@ -20,6 +20,7 @@ import com.intellij.openapi.diagnostic.Logger
 import com.intellij.psi.PsiElement
 import com.intellij.psi.stubs.StubElement
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isNumberedFunctionClassFqName
 import org.jetbrains.kotlin.idea.decompiler.stubBuilder.FlagsToModifiers.*
 import org.jetbrains.kotlin.lexer.KtModifierKeywordToken
 import org.jetbrains.kotlin.lexer.KtTokens
@@ -116,7 +117,7 @@ private class ClassClsStubBuilder(
         val shortName = fqName.shortName().ref()
         val superTypeRefs = supertypeIds.filterNot {
             //TODO: filtering function types should go away
-            KotlinBuiltIns.isNumberedFunctionClassFqName(it.asSingleFqName().toUnsafe())
+            isNumberedFunctionClassFqName(it.asSingleFqName().toUnsafe())
         }.map { it.shortClassName.ref() }.toTypedArray()
         return when (classKind) {
             ProtoBuf.Class.Kind.OBJECT, ProtoBuf.Class.Kind.COMPANION_OBJECT -> {

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/stubBuilder/TypeClsStubBuilder.kt

@@ -20,6 +20,7 @@ import com.google.protobuf.MessageLite
 import com.intellij.psi.PsiElement
 import com.intellij.psi.stubs.StubElement
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isNumberedFunctionClassFqName
 import org.jetbrains.kotlin.lexer.KtModifierKeywordToken
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.load.java.ANNOTATIONS_COPIED_TO_TYPES
@@ -77,7 +78,7 @@ class TypeClsStubBuilder(private val c: ClsStubBuilderContext) {
         }
 
         val classId = c.nameResolver.getClassId(type.className)
-        val shouldBuildAsFunctionType = KotlinBuiltIns.isNumberedFunctionClassFqName(classId.asSingleFqName().toUnsafe())
+        val shouldBuildAsFunctionType = isNumberedFunctionClassFqName(classId.asSingleFqName().toUnsafe())
                                         && type.argumentList.none { it.projection == Projection.STAR }
         if (shouldBuildAsFunctionType) {
             val extension = annotations.any { annotation ->

idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/FunctionsHighlightingVisitor.java

@@ -19,7 +19,7 @@ package org.jetbrains.kotlin.idea.highlighter;
 import com.intellij.lang.annotation.AnnotationHolder;
 import com.intellij.psi.PsiElement;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
+import org.jetbrains.kotlin.builtins.FunctionTypesKt;
 import org.jetbrains.kotlin.descriptors.*;
 import org.jetbrains.kotlin.psi.*;
 import org.jetbrains.kotlin.resolve.BindingContext;
@@ -74,7 +74,7 @@ public class FunctionsHighlightingVisitor extends AfterAnalysisHighlightingVisit
                 DeclarationDescriptor container = calleeDescriptor.getContainingDeclaration();
                 boolean containedInFunctionClassOrSubclass =
                         container instanceof ClassDescriptor &&
-                        KotlinBuiltIns.isFunctionOrExtensionFunctionType(((ClassDescriptor) container).getDefaultType());
+                        FunctionTypesKt.isFunctionOrExtensionFunctionType(((ClassDescriptor) container).getDefaultType());
                 NameHighlighter.highlightName(holder, callee, containedInFunctionClassOrSubclass
                                                               ? KotlinHighlightingColors.VARIABLE_AS_FUNCTION_CALL
                                                               : KotlinHighlightingColors.VARIABLE_AS_FUNCTION_LIKE_CALL);

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/CompletionUtils.kt

@@ -24,6 +24,7 @@ import com.intellij.patterns.ElementPattern
 import com.intellij.patterns.StandardPatterns
 import com.intellij.psi.PsiDocumentManager
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.idea.KotlinIcons
 import org.jetbrains.kotlin.idea.completion.handlers.CastReceiverInsertHandler
@@ -298,7 +299,7 @@ fun breakOrContinueExpressionItems(position: KtElement, breakOrContinue: String)
 fun BasicLookupElementFactory.createLookupElementForType(type: KotlinType): LookupElement? {
     if (type.isError) return null
 
-    if (KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(type)) {
+    if (type.isExactFunctionOrExtensionFunctionType) {
         val text = IdeDescriptorRenderers.SOURCE_CODE_SHORT_NAMES_IN_TYPES.renderType(type)
         val baseLookupElement = LookupElementBuilder.create(text).withIcon(KotlinIcons.LAMBDA)
         return BaseTypeLookupElement(type, baseLookupElement)

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/ContextVariablesProvider.kt

@@ -18,7 +18,7 @@ package org.jetbrains.kotlin.idea.completion
 
 import com.intellij.psi.PsiElement
 import com.intellij.util.SmartList
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.VariableDescriptor
 import org.jetbrains.kotlin.idea.codeInsight.ReferenceVariantsHelper
 import org.jetbrains.kotlin.idea.util.CallTypeAndReceiver
@@ -39,7 +39,7 @@ class RealContextVariablesProvider(
 ) : ContextVariablesProvider {
 
     val allFunctionTypeVariables by lazy {
-        collectVariables().filter { KotlinBuiltIns.isFunctionOrExtensionFunctionType(it.type) }
+        collectVariables().filter { it.type.isFunctionOrExtensionFunctionType }
     }
 
     private fun collectVariables(): Collection<VariableDescriptor> {

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/ExtensionFunctionTypeValueCompletion.kt

@@ -20,7 +20,7 @@ import com.intellij.codeInsight.completion.InsertionContext
 import com.intellij.codeInsight.lookup.LookupElement
 import com.intellij.codeInsight.lookup.LookupElementDecorator
 import com.intellij.codeInsight.lookup.LookupElementPresentation
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.idea.util.CallType
@@ -45,7 +45,7 @@ class ExtensionFunctionTypeValueCompletion(
 
         for (variable in variablesProvider.allFunctionTypeVariables) {
             val variableType = variable.type
-            if (!KotlinBuiltIns.isExtensionFunctionType(variableType)) continue
+            if (!variableType.isExtensionFunctionType) continue
 
             val invokes = variableType.memberScope.getContributedFunctions(OperatorNameConventions.INVOKE, NoLookupLocation.FROM_IDE)
             for (invoke in createSynthesizedInvokes(invokes)) {

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/InsertHandlerProvider.kt

@@ -18,7 +18,9 @@ package org.jetbrains.kotlin.idea.completion
 
 import com.intellij.codeInsight.completion.InsertHandler
 import com.intellij.codeInsight.lookup.LookupElement
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.getParameterTypeProjectionsFromFunctionType
+import org.jetbrains.kotlin.builtins.getReturnTypeFromFunctionType
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.idea.completion.handlers.*
 import org.jetbrains.kotlin.idea.core.ExpectedInfo
@@ -51,8 +53,8 @@ class InsertHandlerProvider(
                             1 -> {
                                 if (callType != CallType.SUPER_MEMBERS) { // for super call we don't suggest to generate "super.foo { ... }" (seems to be non-typical use)
                                     val parameterType = parameters.single().type
-                                    if (KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(parameterType)) {
+                                    if (parameterType.isExactFunctionOrExtensionFunctionType) {
-                                        val parameterCount = KotlinBuiltIns.getParameterTypeProjectionsFromFunctionType(parameterType).size
+                                        val parameterCount = getParameterTypeProjectionsFromFunctionType(parameterType).size
                                         if (parameterCount <= 1) {
                                             // otherwise additional item with lambda template is to be added
                                             return KotlinFunctionInsertHandler.Normal(needTypeArguments, inputValueArguments = false, lambdaInfo = GenerateLambdaInfo(parameterType, false))
@@ -96,9 +98,9 @@ class InsertHandlerProvider(
                 potentiallyInferred.add(descriptor)
             }
 
-            if (KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(type) && KotlinBuiltIns.getParameterTypeProjectionsFromFunctionType(type).size <= 1) {
+            if (type.isExactFunctionOrExtensionFunctionType && getParameterTypeProjectionsFromFunctionType(type).size <= 1) {
                 // do not rely on inference from input of function type with one or no arguments - use only return type of functional type
-                addPotentiallyInferred(KotlinBuiltIns.getReturnTypeFromFunctionType(type))
+                addPotentiallyInferred(getReturnTypeFromFunctionType(type))
                 return
             }
 

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/LookupElementFactory.kt

@@ -22,7 +22,8 @@ import com.intellij.codeInsight.lookup.LookupElementDecorator
 import com.intellij.codeInsight.lookup.LookupElementPresentation
 import com.intellij.codeInsight.lookup.impl.LookupCellRenderer
 import com.intellij.util.SmartList
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.getParameterTypeProjectionsFromFunctionType
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.idea.completion.handlers.GenerateLambdaInfo
 import org.jetbrains.kotlin.idea.completion.handlers.KotlinFunctionInsertHandler
@@ -67,7 +68,7 @@ class LookupElementFactory(
     companion object {
         fun hasSingleFunctionTypeParameter(descriptor: FunctionDescriptor): Boolean {
             val parameter = descriptor.original.valueParameters.singleOrNull() ?: return false
-            return KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(parameter.type)
+            return parameter.type.isExactFunctionOrExtensionFunctionType
         }
     }
 
@@ -107,11 +108,11 @@ class LookupElementFactory(
         val lastParameter = descriptor.valueParameters.lastOrNull() ?: return
         if (!descriptor.valueParameters.all { it == lastParameter || it.hasDefaultValue() }) return
 
-        if (KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(lastParameter.original.type)) {
+        if (lastParameter.original.type.isExactFunctionOrExtensionFunctionType) {
             val isSingleParameter = descriptor.valueParameters.size == 1
 
             val parameterType = lastParameter.type
-            val functionParameterCount = KotlinBuiltIns.getParameterTypeProjectionsFromFunctionType(parameterType).size
+            val functionParameterCount = getParameterTypeProjectionsFromFunctionType(parameterType).size
             // we don't need special item inserting lambda for single functional parameter that does not need multiple arguments because the default item will be special in this case
             if (!isSingleParameter || functionParameterCount > 1) {
                 add(createFunctionCallElementWithLambda(descriptor, parameterType, functionParameterCount > 1, useReceiverTypes))

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/handlers/GenerateLambda.kt

@@ -25,7 +25,8 @@ import com.intellij.openapi.project.Project
 import com.intellij.openapi.util.TextRange
 import com.intellij.psi.PsiDocumentManager
 import com.intellij.psi.util.PsiTreeUtil
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.getParameterTypeProjectionsFromFunctionType
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.idea.caches.resolve.getResolutionFacade
 import org.jetbrains.kotlin.idea.core.ExpectedInfos
 import org.jetbrains.kotlin.idea.core.KotlinNameSuggester
@@ -83,12 +84,12 @@ private fun needExplicitParameterTypes(context: InsertionContext, placeholderRan
 
     val functionTypes = expectedInfos
             .mapNotNull { it.fuzzyType?.type }
-            .filter { KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(it) }
+            .filter(KotlinType::isExactFunctionOrExtensionFunctionType)
             .toSet()
     if (functionTypes.size <= 1) return false
 
-    val lambdaParameterCount = KotlinBuiltIns.getParameterTypeProjectionsFromFunctionType(lambdaType).size
+    val lambdaParameterCount = getParameterTypeProjectionsFromFunctionType(lambdaType).size
-    return functionTypes.filter { KotlinBuiltIns.getParameterTypeProjectionsFromFunctionType(it).size == lambdaParameterCount }.size > 1
+    return functionTypes.filter { getParameterTypeProjectionsFromFunctionType(it).size == lambdaParameterCount }.size > 1
 }
 
 private fun buildTemplate(lambdaType: KotlinType, explicitParameterTypes: Boolean, project: Project): Template {
@@ -128,4 +129,4 @@ private class ParameterNameExpression(val nameSuggestions: Array<String>) : Expr
 }
 
 fun functionParameterTypes(functionType: KotlinType): List<KotlinType>
-        = KotlinBuiltIns.getParameterTypeProjectionsFromFunctionType(functionType).map { it.type }
+        = getParameterTypeProjectionsFromFunctionType(functionType).map { it.type }

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/smart/LambdaItems.kt

@@ -19,7 +19,7 @@ package org.jetbrains.kotlin.idea.completion.smart
 import com.intellij.codeInsight.lookup.LookupElement
 import com.intellij.codeInsight.lookup.LookupElementBuilder
 import com.intellij.openapi.util.TextRange
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.getParameterTypeProjectionsFromFunctionType
 import org.jetbrains.kotlin.idea.completion.handlers.insertLambdaTemplate
 import org.jetbrains.kotlin.idea.completion.handlers.lambdaPresentation
 import org.jetbrains.kotlin.idea.completion.suppressAutoInsertion
@@ -43,7 +43,7 @@ object LambdaItems {
                 .toSet()
 
         val singleType = if (distinctTypes.size == 1) distinctTypes.single() else null
-        val singleSignatureLength = singleType?.let { KotlinBuiltIns.getParameterTypeProjectionsFromFunctionType(it).size }
+        val singleSignatureLength = singleType?.let { getParameterTypeProjectionsFromFunctionType(it).size }
         val offerNoParametersLambda = singleSignatureLength == 0 || singleSignatureLength == 1
         if (offerNoParametersLambda) {
             val lookupElement = LookupElementBuilder.create(lambdaPresentation(null))

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/smart/TypeInstantiationItems.kt

@@ -26,6 +26,7 @@ import com.intellij.psi.search.GlobalSearchScope
 import com.intellij.psi.search.searches.ClassInheritorsSearch
 import org.jetbrains.kotlin.asJava.toLightClass
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptor
@@ -80,7 +81,7 @@ class TypeInstantiationItems(
             fuzzyType: FuzzyType,
             tail: Tail?
     ) {
-        if (KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(fuzzyType.type)) return // do not show "object: ..." for function types
+        if (fuzzyType.type.isExactFunctionOrExtensionFunctionType) return // do not show "object: ..." for function types
 
         val classifier = fuzzyType.type.constructor.declarationDescriptor
         if (classifier !is ClassDescriptor) return

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/smart/Utils.kt

@@ -22,8 +22,8 @@ import com.intellij.codeInsight.lookup.LookupElement
 import com.intellij.codeInsight.lookup.LookupElementDecorator
 import com.intellij.codeInsight.lookup.LookupElementPresentation
 import com.intellij.openapi.util.Key
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.builtins.ReflectionTypes
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.impl.LocalVariableDescriptor
 import org.jetbrains.kotlin.idea.completion.handlers.WithExpressionPrefixInsertHandler
@@ -308,8 +308,7 @@ fun DeclarationDescriptor.fuzzyTypesForSmartCompletion(
 }
 
 fun Collection<ExpectedInfo>.filterFunctionExpected()
-        = filter { it.fuzzyType != null && KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(it.fuzzyType!!.type) }
+        = filter { it.fuzzyType != null && it.fuzzyType!!.type.isExactFunctionOrExtensionFunctionType }
 
 fun Collection<ExpectedInfo>.filterCallableExpected()
         = filter { it.fuzzyType != null && ReflectionTypes.isCallableType(it.fuzzyType!!.type) }
-

idea/idea-core/src/org/jetbrains/kotlin/idea/core/ExpectedInfos.kt

@@ -17,7 +17,8 @@
 package org.jetbrains.kotlin.idea.core
 
 import com.intellij.openapi.util.text.StringUtil
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.getReturnTypeFromFunctionType
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.idea.resolve.ResolutionFacade
 import org.jetbrains.kotlin.idea.resolve.ideService
@@ -319,7 +320,7 @@ class ExpectedInfos(
             if (parameter.hasDefaultValue()) return false // parameter is optional
             if (parameter.varargElementType != null) return false // vararg arguments list can be empty
             // last parameter of functional type can be placed outside parenthesis:
-            if (!isArrayAccess && parameter == parameters.last() && KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(parameter.type)) return false
+            if (!isArrayAccess && parameter == parameters.last() && parameter.type.isExactFunctionOrExtensionFunctionType) return false
             return true
         }
 
@@ -363,7 +364,7 @@ class ExpectedInfos(
                 parameter.type
 
             if (isFunctionLiteralArgument) {
-                if (KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(parameterType)) {
+                if (parameterType.isExactFunctionOrExtensionFunctionType) {
                     add(ExpectedInfo.createForArgument(parameterType, expectedName, null, argumentPositionData))
                 }
             }
@@ -482,9 +483,9 @@ class ExpectedInfos(
             val literalExpression = functionLiteral.parent as KtLambdaExpression
             return calculate(literalExpression)
                     .mapNotNull { it.fuzzyType }
-                    .filter { KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(it.type) }
+                    .filter { it.type.isExactFunctionOrExtensionFunctionType }
                     .map {
-                        val returnType = KotlinBuiltIns.getReturnTypeFromFunctionType(it.type)
+                        val returnType = getReturnTypeFromFunctionType(it.type)
                         ExpectedInfo(FuzzyType(returnType, it.freeParameters), null, Tail.RBRACE)
                     }
         }

idea/idea-core/src/org/jetbrains/kotlin/idea/core/KotlinNameSuggester.kt

@@ -18,6 +18,7 @@ package org.jetbrains.kotlin.idea.core
 
 import com.intellij.openapi.util.text.StringUtil
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.lexer.KotlinLexer
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.psi.*
@@ -215,7 +216,7 @@ object KotlinNameSuggester {
                 }
             }
         }
-        else if (KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(type)) {
+        else if (type.isExactFunctionOrExtensionFunctionType) {
             addName("function", validator)
         }
         else {

idea/src/org/jetbrains/kotlin/idea/actions/internal/FindImplicitNothingAction.kt

@@ -34,6 +34,8 @@ import com.intellij.usages.UsageTarget
 import com.intellij.usages.UsageViewManager
 import com.intellij.usages.UsageViewPresentation
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.getReturnTypeFromFunctionType
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.idea.caches.resolve.getResolutionFacade
 import org.jetbrains.kotlin.psi.*
@@ -129,7 +131,7 @@ class FindImplicitNothingAction : AnAction() {
         return when {
             KotlinBuiltIns.isNothing(this) -> true
 
-            KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(this) -> KotlinBuiltIns.getReturnTypeFromFunctionType(this).isNothingOrNothingFunctionType()
+            this.isExactFunctionOrExtensionFunctionType -> getReturnTypeFromFunctionType(this).isNothingOrNothingFunctionType()
 
             else -> false
         }

idea/src/org/jetbrains/kotlin/idea/editor/fixers/KotlinLastLambdaParameterFixer.kt

@@ -19,7 +19,7 @@ package org.jetbrains.kotlin.idea.editor.fixers
 import com.intellij.lang.SmartEnterProcessorWithFixers
 import com.intellij.openapi.editor.Editor
 import com.intellij.psi.PsiElement
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.editor.KotlinSmartEnterHandler
 import org.jetbrains.kotlin.psi.KtCallExpression
@@ -38,7 +38,7 @@ class KotlinLastLambdaParameterFixer : SmartEnterProcessorWithFixers.Fixer<Kotli
 
         if (resolvedCall.valueArguments.size == valueParameters.size - 1) {
             val type = valueParameters.last().type
-            if (KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(type)) {
+            if (type.isExactFunctionOrExtensionFunctionType) {
                 val doc = editor.document
 
                 var offset = element.endOffset

idea/src/org/jetbrains/kotlin/idea/intentions/MoveLambdaOutsideParenthesesIntention.kt

@@ -17,7 +17,7 @@
 package org.jetbrains.kotlin.idea.intentions
 
 import com.intellij.openapi.editor.Editor
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.core.moveFunctionLiteralOutsideParentheses
@@ -48,7 +48,7 @@ class MoveLambdaOutsideParenthesesIntention : SelfTargetingIntention<KtCallExpre
                 // if there are functions among candidates but none of them have last function parameter then not show the intention
                 if (candidates.isNotEmpty() && candidates.none {
                     val lastParameter = it.valueParameters.lastOrNull()
-                    lastParameter != null && KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(lastParameter.type)
+                    lastParameter != null && lastParameter.type.isExactFunctionOrExtensionFunctionType
                 }) {
                     return false
                 }

idea/src/org/jetbrains/kotlin/idea/quickfix/createFromUsage/createCallable/CreateFunctionFromCallableReferenceActionFactory.kt

@@ -17,7 +17,10 @@
 package org.jetbrains.kotlin.idea.quickfix.createFromUsage.createCallable
 
 import com.intellij.util.SmartList
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.getParameterTypeProjectionsFromFunctionType
+import org.jetbrains.kotlin.builtins.getReceiverTypeFromFunctionType
+import org.jetbrains.kotlin.builtins.getReturnTypeFromFunctionType
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.diagnostics.Diagnostic
 import org.jetbrains.kotlin.idea.caches.resolve.getResolutionFacade
 import org.jetbrains.kotlin.idea.quickfix.createFromUsage.callableBuilder.*
@@ -25,6 +28,7 @@ import org.jetbrains.kotlin.idea.refactoring.getExtractionContainers
 import org.jetbrains.kotlin.psi.KtCallableReferenceExpression
 import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
 import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
+import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.Variance
 import org.jetbrains.kotlin.utils.ifEmpty
 
@@ -39,22 +43,27 @@ object CreateFunctionFromCallableReferenceActionFactory : CreateCallableMemberFr
         val context = resolutionFacade.analyze(element, BodyResolveMode.PARTIAL)
         return element
                 .guessTypes(context, resolutionFacade.moduleDescriptor)
-                .filter(KotlinBuiltIns::isExactFunctionOrExtensionFunctionType)
+                .filter(KotlinType::isExactFunctionOrExtensionFunctionType)
                 .mapNotNull {
-                    val expectedReceiverType = KotlinBuiltIns.getReceiverType(it)
+                    val expectedReceiverType = getReceiverTypeFromFunctionType(it)
                     val actualReceiverTypeRef = element.typeReference
                     val receiverTypeInfo = actualReceiverTypeRef?.let { TypeInfo(it, Variance.IN_VARIANCE) } ?: TypeInfo.Empty
-                    val returnTypeInfo = TypeInfo(KotlinBuiltIns.getReturnTypeFromFunctionType(it), Variance.OUT_VARIANCE)
+                    val returnTypeInfo = TypeInfo(getReturnTypeFromFunctionType(it), Variance.OUT_VARIANCE)
                     val containers = element.getExtractionContainers(includeAll = true).ifEmpty { return@mapNotNull null }
                     val parameterInfos = SmartList<ParameterInfo>().apply {
                         if (actualReceiverTypeRef == null && expectedReceiverType != null) {
                             add(ParameterInfo(TypeInfo(expectedReceiverType, Variance.IN_VARIANCE)))
                         }
 
-                        KotlinBuiltIns
+                        getParameterTypeProjectionsFromFunctionType(it)
-                                .getParameterTypeProjectionsFromFunctionType(it)
+                                .let {
-                                .let { if (actualReceiverTypeRef != null && expectedReceiverType == null && it.isNotEmpty()) it.subList(1, it.size) else it }
+                                    if (actualReceiverTypeRef != null && expectedReceiverType == null && it.isNotEmpty())
-                                .mapTo(this) { ParameterInfo(TypeInfo(it.type, it.projectionKind)) }
+                                        it.subList(1, it.size)
+                                    else it
+                                }
+                                .mapTo(this) {
+                                    ParameterInfo(TypeInfo(it.type, it.projectionKind))
+                                }
                     }
 
                     FunctionInfo(name, receiverTypeInfo, returnTypeInfo, containers, parameterInfos)

idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeInfo.kt

@@ -29,13 +29,12 @@ import com.intellij.util.VisibilityUtil
 import org.jetbrains.kotlin.asJava.getRepresentativeLightMethod
 import org.jetbrains.kotlin.asJava.toLightMethods
 import org.jetbrains.kotlin.asJava.unwrapped
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExactFunctionType
 import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.idea.KotlinLanguage
-import org.jetbrains.kotlin.idea.caches.resolve.getJavaMethodDescriptor
 import org.jetbrains.kotlin.idea.caches.resolve.getJavaOrKotlinMemberDescriptor
 import org.jetbrains.kotlin.idea.project.ProjectStructureUtil
 import org.jetbrains.kotlin.idea.refactoring.changeSignature.KotlinMethodDescriptor.Kind
@@ -249,7 +248,7 @@ open class KotlinChangeInfo(
             if (kind == Kind.FUNCTION) {
                 receiverParameterInfo?.let {
                     val typeInfo = it.currentTypeInfo
-                    if (typeInfo.type != null && KotlinBuiltIns.isExactFunctionType(typeInfo.type)) {
+                    if (typeInfo.type != null && typeInfo.type.isExactFunctionType) {
                         buffer.append("(${typeInfo.render()})")
                     }
                     else {

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractionEngine/extractorUtil.kt

@@ -22,11 +22,9 @@ import com.intellij.psi.codeStyle.CodeStyleManager
 import com.intellij.psi.search.LocalSearchScope
 import com.intellij.psi.search.searches.ReferencesSearch
 import com.intellij.refactoring.BaseRefactoringProcessor
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExactFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.idea.core.*
-import org.jetbrains.kotlin.idea.refactoring.isMultiLine
-import org.jetbrains.kotlin.idea.refactoring.removeTemplateEntryBracesIfPossible
 import org.jetbrains.kotlin.idea.intentions.ConvertToExpressionBodyIntention
 import org.jetbrains.kotlin.idea.intentions.InfixCallToOrdinaryIntention
 import org.jetbrains.kotlin.idea.intentions.OperatorToFunctionIntention
@@ -34,6 +32,8 @@ import org.jetbrains.kotlin.idea.intentions.RemoveExplicitTypeArgumentsIntention
 import org.jetbrains.kotlin.idea.refactoring.introduce.*
 import org.jetbrains.kotlin.idea.refactoring.introduce.extractionEngine.OutputValue.*
 import org.jetbrains.kotlin.idea.refactoring.introduce.extractionEngine.OutputValueBoxer.AsTuple
+import org.jetbrains.kotlin.idea.refactoring.isMultiLine
+import org.jetbrains.kotlin.idea.refactoring.removeTemplateEntryBracesIfPossible
 import org.jetbrains.kotlin.idea.util.IdeDescriptorRenderers
 import org.jetbrains.kotlin.idea.util.ShortenReferences
 import org.jetbrains.kotlin.idea.util.psi.patternMatching.*
@@ -86,7 +86,7 @@ private fun buildSignature(config: ExtractionGeneratorConfiguration, renderer: D
         config.descriptor.receiverParameter?.let {
             val receiverType = it.getParameterType(config.descriptor.extractionData.options.allowSpecialClassNames)
             val receiverTypeAsString = receiverType.typeAsString()
-            val isFunctionType = KotlinBuiltIns.isExactFunctionOrExtensionFunctionType(receiverType)
+            val isFunctionType = receiverType.isExactFunctionOrExtensionFunctionType
             receiver(if (isFunctionType) "($receiverTypeAsString)" else receiverTypeAsString)
         }
 

js/js.inliner/src/org/jetbrains/kotlin/js/inline/FunctionReader.kt

@@ -20,7 +20,8 @@ import com.google.dart.compiler.backend.js.ast.*
 import com.google.dart.compiler.backend.js.ast.metadata.inlineStrategy
 import com.google.gwt.dev.js.ThrowExceptionOnErrorReporter
 import com.intellij.util.containers.SLRUCache
-import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.builtins.isExtensionFunctionType
+import org.jetbrains.kotlin.builtins.isFunctionOrExtensionFunctionType
 import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.js.config.LibrarySourcesConfig
 import org.jetbrains.kotlin.js.inline.util.IdentitySet
@@ -141,9 +142,9 @@ private fun JsFunction.markInlineArguments(descriptor: CallableDescriptor) {
         if (!CallExpressionTranslator.shouldBeInlined(descriptor)) continue
 
         val type = param.type
-        if (!KotlinBuiltIns.isFunctionOrExtensionFunctionType(type)) continue
+        if (!type.isFunctionOrExtensionFunctionType) continue
 
-        val namesSet = if (KotlinBuiltIns.isExtensionFunctionType(type)) inlineExtensionFuns else inlineFuns
+        val namesSet = if (type.isExtensionFunctionType) inlineExtensionFuns else inlineFuns
         namesSet.add(paramsJs[i + offset].name)
     }