## Composition by architecture modules

Each [architecture module and platform](platforms.md) can contribute code to any of the elements.
Not every module contributes to every element.

      if (exception == null) {
        exception = ioe
      }
    }
  }
  if (exception != null) {
    throw exception
  }
}

internal fun <E> MutableList<E>.addIfAbsent(element: E) {
  if (!contains(element)) add(element)
}

internal fun Exception.withSuppressed(suppressed: List<Exception>): Throwable =
  apply {
    for (e in suppressed) addSuppressed(e)
  }

            token,
        )
    }

    override fun analyze(elements: List<KtElement>, mode: Fe10AnalysisFacade.AnalysisMode): BindingContext {
        val element = elements.firstOrNull() ?: return BindingContext.EMPTY
        return getHandler(element).resolveSession.orThrowResolutionNotPerformedError().bindingContext
    }

            return mapping[fir]?.getOrNull()
        }

        override fun visitElement(element: FirElement) {
            withElement(element) {
                if (element in statements) {
                    // The leaf is in mapping, but its value is still 'null'
                    mapping.computeIfAbsent(element) { _ ->
                        unmappedCount -= 1

            registerProvider provider@{ element: KtValueArgument ->
                if (element.isNamed()) return@provider null
                val annotationEntry = element.getParentOfTypeAndBranch<KtAnnotationEntry> { valueArgumentList } ?: return@provider null
                if (annotationEntry.valueArguments.size != 1) return@provider null

                KtDefaultAnnotationArgumentReference(element)
            }
        }
    }

import org.jetbrains.kotlin.utils.exceptions.withPsiEntry

object KtFirReferenceResolver : ResolveCache.PolyVariantResolver<KtReference> {
    class KotlinResolveResult(element: PsiElement) : PsiElementResolveResult(element)

    @OptIn(KtAllowAnalysisOnEdt::class, KtAllowAnalysisFromWriteAction::class)
    override fun resolve(ref: KtReference, incompleteCode: Boolean): Array<ResolveResult> {

internal fun <T> List<T>.toImmutableList(): List<T> {
  return Collections.unmodifiableList(toMutableList())
}

/** Returns an immutable list containing [elements]. */
@SafeVarargs
internal fun <T> immutableListOf(vararg elements: T): List<T> {
  return Collections.unmodifiableList(listOf(*elements.clone()))
}

/** Closes this, ignoring any checked exceptions. */
internal fun Socket.closeQuietly() {
  try {
    close()

        val firSymbol = useSiteSession.symbolProvider.getTopLevelCallableSymbols(kotlinPackage, identifier).firstOrNull {
            /* choose (for byte array)
             * public fun byteArrayOf(vararg elements: kotlin.Byte): kotlin.ByteArray
             */
            (it as? FirFunctionSymbol<*>)?.fir?.valueParameters?.singleOrNull()?.isVararg == true
        } as? FirNamedFunctionSymbol ?: return null

            // For invalid code like the following,
            // ```
            // when {
            //   true, false -> {}
            // }
            // ```
            // `false` does not have a corresponding elements on the FIR side and hence the containing `FirWhenBranch` is returned. In this
            // case, we simply report null since FIR does not know about it.
            else -> null
        }
    }

    override val token: KtLifetimeToken,
) : KtDiagnosticProvider(), KtFirAnalysisSessionComponent {

    override fun getDiagnosticsForElement(
        element: KtElement,
        filter: KtDiagnosticCheckerFilter
    ): Collection<KtDiagnosticWithPsi<*>> {
        return element.getDiagnostics(firResolveSession, filter.asLLFilter()).map { it.asKtDiagnostic() }
    }