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/*
* Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
*/
package org.jetbrains.kotlin.backend.common
import com.intellij.openapi.application.ApplicationManager
import com.intellij.openapi.project.Project
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.descriptors.*
import org.jetbrains.kotlin.diagnostics.DiagnosticSink
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.incremental.components.NoLookupLocation
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.psi.*
import org.jetbrains.kotlin.psi.psiUtil.hasExpectModifier
import org.jetbrains.kotlin.resolve.BindingContext
import org.jetbrains.kotlin.resolve.DescriptorToSourceUtils
import org.jetbrains.kotlin.resolve.DescriptorUtils
import org.jetbrains.kotlin.resolve.bindingContextUtil.isUsedAsExpression
import org.jetbrains.kotlin.resolve.calls.callUtil.getResolvedCall
import org.jetbrains.kotlin.resolve.multiplatform.ExpectedActualResolver
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.kotlin.util.getExceptionMessage
import org.jetbrains.kotlin.util.getNonPrivateTraitMembersForDelegation
import org.jetbrains.kotlin.utils.DFS
import org.jetbrains.kotlin.utils.KotlinExceptionWithAttachments
object CodegenUtil {
@JvmStatic
fun getDelegatePropertyIfAny(
expression: KtExpression, classDescriptor: ClassDescriptor, bindingContext: BindingContext
): PropertyDescriptor? {
val call = (expression as? KtSimpleNameExpression)?.getResolvedCall(bindingContext) ?: return null
val callResultingDescriptor = call.resultingDescriptor as? ValueParameterDescriptor ?: return null
// constructor parameter
if (callResultingDescriptor.containingDeclaration is ConstructorDescriptor) {
// constructor of my class
if (callResultingDescriptor.containingDeclaration.containingDeclaration === classDescriptor) {
return bindingContext.get(BindingContext.VALUE_PARAMETER_AS_PROPERTY, callResultingDescriptor)
}
}
return null
}
@JvmStatic
fun isFinalPropertyWithBackingField(propertyDescriptor: PropertyDescriptor?, bindingContext: BindingContext): Boolean {
return propertyDescriptor != null &&
!propertyDescriptor.isVar &&
(bindingContext.get(BindingContext.BACKING_FIELD_REQUIRED, propertyDescriptor) ?: false)
}
@JvmStatic
@JvmOverloads
fun getNonPrivateTraitMethods(descriptor: ClassDescriptor, copy: Boolean = true): Map {
val result = linkedMapOf()
for ((declaration, traitMember) in getNonPrivateTraitMembersForDelegation(descriptor)) {
assert(traitMember.modality !== Modality.ABSTRACT) { "Cannot delegate to abstract trait method: $declaration" }
// inheritedMember can be abstract here. In order for FunctionCodegen to generate the method body, we're creating a copy here
// with traitMember's modality
result.putAll(
if (copy)
copyFunctions(
declaration, traitMember, declaration.containingDeclaration, traitMember.modality,
DescriptorVisibilities.PUBLIC, CallableMemberDescriptor.Kind.DECLARATION, true
)
else mapMembers(declaration, traitMember)
)
}
return result
}
fun copyFunctions(
inheritedMember: CallableMemberDescriptor,
traitMember: CallableMemberDescriptor,
newOwner: DeclarationDescriptor,
modality: Modality,
visibility: DescriptorVisibility,
kind: CallableMemberDescriptor.Kind,
copyOverrides: Boolean
): Map =
mapMembers(inheritedMember.copy(newOwner, modality, visibility, kind, copyOverrides), traitMember)
private fun mapMembers(
inherited: CallableMemberDescriptor,
traitMember: CallableMemberDescriptor
): Map = when (traitMember) {
is SimpleFunctionDescriptor -> mapOf(traitMember to inherited as FunctionDescriptor)
is PropertyDescriptor -> linkedMapOf().also { result ->
for (traitAccessor in traitMember.accessors) {
for (inheritedAccessor in (inherited as PropertyDescriptor).accessors) {
if ((inheritedAccessor is PropertyGetterDescriptor) == (traitAccessor is PropertyGetterDescriptor)) {
result[traitAccessor] = inheritedAccessor
}
}
}
}
else -> error("Unexpected member: $inherited")
}
@JvmStatic
fun getSuperClassBySuperTypeListEntry(specifier: KtSuperTypeListEntry, bindingContext: BindingContext): ClassDescriptor? {
val superType = bindingContext.get(BindingContext.TYPE, specifier.typeReference!!)
return superType?.constructor?.declarationDescriptor as? ClassDescriptor
}
@JvmStatic
fun getLineNumberForElement(statement: PsiElement, markEndOffset: Boolean): Int? {
val file = statement.containingFile
if (file is KtFile && file.doNotAnalyze != null) {
return null
}
if (statement is KtConstructorDelegationReferenceExpression && statement.textLength == 0) {
// PsiElement for constructor delegation reference is always generated, so we shouldn't mark it's line number if it's empty
return null
}
val document = file.viewProvider.document
return document?.getLineNumber(if (markEndOffset) statement.textRange.endOffset else statement.textOffset)?.plus(1)
}
// Returns the descriptor for a function (whose parameters match the given predicate) which should be generated in the class.
// Note that we always generate equals/hashCode/toString in data classes, unless that would lead to a JVM signature clash with
// another method, which can only happen if the method is declared in the data class (manually or via delegation).
// Also there are no hard asserts or assumptions because such methods are generated for erroneous code as well (in light classes mode).
fun getMemberToGenerate(
classDescriptor: ClassDescriptor,
name: String,
isReturnTypeOk: (KotlinType) -> Boolean,
areParametersOk: (List) -> Boolean
): FunctionDescriptor? =
classDescriptor.unsubstitutedMemberScope.getContributedFunctions(Name.identifier(name), NoLookupLocation.FROM_BACKEND)
.singleOrNull { function ->
function.kind.let { kind -> kind == CallableMemberDescriptor.Kind.SYNTHESIZED || kind == CallableMemberDescriptor.Kind.FAKE_OVERRIDE } &&
function.modality != Modality.FINAL &&
areParametersOk(function.valueParameters) &&
function.returnType != null &&
isReturnTypeOk(function.returnType!!)
}
@JvmStatic
fun isExhaustive(bindingContext: BindingContext, whenExpression: KtWhenExpression, isStatement: Boolean): Boolean {
val slice = if (isStatement && !whenExpression.isUsedAsExpression(bindingContext)) {
BindingContext.IMPLICIT_EXHAUSTIVE_WHEN
}
else {
BindingContext.EXHAUSTIVE_WHEN
}
return bindingContext[slice, whenExpression] == true
}
@JvmStatic
fun constructFakeFunctionCall(project: Project, arity: Int): KtCallExpression {
val fakeFunctionCall =
(1..arity).joinToString(prefix = "callableReferenceFakeCall(", separator = ", ", postfix = ")") { "p$it" }
return KtPsiFactory(project, markGenerated = false).createExpression(fakeFunctionCall) as KtCallExpression
}
/**
* Returns functions, properties and type aliases in the given [file] which should be generated by the back-end.
*/
@JvmStatic
fun getMemberDeclarationsToGenerate(file: KtFile): List {
val declarations = ApplicationManager.getApplication().runReadAction> { file.declarations }
return declarations.filter { declaration ->
!declaration.hasExpectModifier() && (declaration is KtNamedFunction || declaration is KtProperty || declaration is KtTypeAlias)
}
}
@JvmStatic
fun getMemberDescriptorsToGenerate(file: KtFile, bindingContext: BindingContext): List =
getMemberDeclarationsToGenerate(file).mapNotNull { declaration ->
bindingContext.get(BindingContext.DECLARATION_TO_DESCRIPTOR, declaration) as MemberDescriptor?
}
@JvmStatic
fun findExpectedFunctionForActual(descriptor: FunctionDescriptor): FunctionDescriptor? {
val compatibleExpectedFunctions = with(ExpectedActualResolver) {
descriptor.findCompatibleExpectedForActual(DescriptorUtils.getContainingModule(descriptor))
}
return compatibleExpectedFunctions.firstOrNull() as FunctionDescriptor?
}
@JvmStatic
fun getFunctionParametersForDefaultValueGeneration(
descriptor: FunctionDescriptor,
trace: DiagnosticSink?
): List {
if (descriptor.isActual) {
val actualParameters = descriptor.valueParameters
if (actualParameters.any { it.declaresOrInheritsDefaultValue() }) {
// This is incorrect code: actual function cannot have default values, they should be declared in the expected function.
// But until KT-22818 is fixed, we need to provide a workaround for the exception that happens on complex default values
// in the expected function. One may suppress the error then, and declare default values _both_ in expect and actual.
// With this code, we'll generate actual default values if they're present, and expected default values otherwise.
return actualParameters
}
val expected = CodegenUtil.findExpectedFunctionForActual(descriptor)
if (expected != null && expected.valueParameters.any(ValueParameterDescriptor::declaresDefaultValue)) {
val element = DescriptorToSourceUtils.descriptorToDeclaration(expected)
if (element == null) {
if (trace != null) {
val actualDeclaration = DescriptorToSourceUtils.descriptorToDeclaration(descriptor)
?: error("Not a source declaration: $descriptor")
trace.report(Errors.EXPECTED_FUNCTION_SOURCE_WITH_DEFAULT_ARGUMENTS_NOT_FOUND.on(actualDeclaration))
}
return actualParameters
}
return expected.valueParameters
}
}
return descriptor.valueParameters
}
// This function is private here because no one is supposed to use it except for the hack above.
// Please use ValueParameterDescriptor.hasDefaultValue instead.
private fun ValueParameterDescriptor.declaresOrInheritsDefaultValue(): Boolean {
return DFS.ifAny(
listOf(this),
{ current -> current.overriddenDescriptors.map(ValueParameterDescriptor::getOriginal) },
{ it.declaresDefaultValue() }
)
}
@JvmStatic
fun reportBackendException(exception: Throwable, phase: String, location: String?, additionalMessage: String? = null): Nothing {
// CompilationException (the only KotlinExceptionWithAttachments possible here) is already supposed
// to have all information about the context.
if (exception is KotlinExceptionWithAttachments) throw exception
throw BackendException(
getExceptionMessage("Backend", "Exception during $phase", exception, location) +
additionalMessage?.let { "\n" + it }.orEmpty(),
exception
)
}
}
