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/*
* 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.cli.jvm.compiler
import com.intellij.openapi.vfs.VirtualFile
import com.intellij.util.containers.IntArrayList
import org.jetbrains.kotlin.name.ClassId
import org.jetbrains.kotlin.name.FqName
import java.util.ArrayList
import java.util.EnumSet
import java.util.HashMap
public data class JavaRoot(public val file: VirtualFile, public val type: JavaRoot.RootType) {
public enum class RootType {
SOURCE,
BINARY
}
companion object RootTypes {
public val OnlyBinary: Set = EnumSet.of(RootType.BINARY)
public val SourceAndBinary: Set = EnumSet.of(RootType.BINARY, RootType.SOURCE)
}
}
// speeds up finding files/classes in classpath/java source roots
// NOT THREADSAFE, needs to be adapted/removed if we want compiler to be multithreaded
// the main idea of this class is for each package to store roots which contains it to avoid excessive file system traversal
public class JvmDependenciesIndex(_roots: List) {
//these fields are computed based on _roots passed to constructor which are filled in later
private val roots: List by lazy { _roots.toList() }
private val maxIndex: Int
get() = roots.size()
// each "Cache" object corresponds to a package
private class Cache {
private val innerPackageCaches = HashMap()
fun get(name: String) = innerPackageCaches.getOrPut(name) { Cache() }
// indices of roots that are known to contain this package
// if this list contains [1, 3, 5] then roots with indices 1, 3 and 5 are known to contain this package, 2 and 4 are known not to (no information about roots 6 or higher)
// if this list contains maxIndex that means that all roots containing this package are known
val rootIndices = IntArrayList()
}
// root "Cache" object corresponds to DefaultPackage which exists in every root
private val rootCache: Cache by lazy {
with(Cache()) {
roots.indices.forEach {
rootIndices.add(it)
}
rootIndices.add(maxIndex)
rootIndices.trimToSize()
this
}
}
// holds the request and the result last time we searched for class
// helps improve several scenarios, LazyJavaResolverContext.findClassInJava being the most important
private var lastClassSearch: Pair? = null
// findClassGivenDirectory MUST check whether the class with this classId exists in given package
public fun findClass(
classId: ClassId,
acceptedRootTypes: Set = JavaRoot.SourceAndBinary,
findClassGivenDirectory: (VirtualFile, JavaRoot.RootType) -> T?
): T? {
return search(FindClassRequest(classId, acceptedRootTypes)) { dir, rootType ->
val found = findClassGivenDirectory(dir, rootType)
HandleResult(found, continueSearch = found == null)
}
}
public fun traverseDirectoriesInPackage(
packageFqName: FqName,
acceptedRootTypes: Set = JavaRoot.SourceAndBinary,
continueSearch: (VirtualFile, JavaRoot.RootType) -> Boolean
) {
search(TraverseRequest(packageFqName, acceptedRootTypes)) { dir, rootType ->
HandleResult(Unit, continueSearch(dir, rootType))
}
}
private data class HandleResult(val result: T?, val continueSearch: Boolean)
private fun search(
request: SearchRequest,
handler: (VirtualFile, JavaRoot.RootType) -> HandleResult
): T? {
// default to searching with given parameters
fun doSearch() = doSearch(request, handler)
// make a decision based on information saved from last class search
if (request !is FindClassRequest || lastClassSearch == null) {
return doSearch()
}
val (cachedRequest, cachedResult) = lastClassSearch!!
if (cachedRequest.classId != request.classId) {
return doSearch()
}
when (cachedResult) {
is SearchResult.NotFound -> {
val limitedRootTypes = request.acceptedRootTypes.toHashSet()
limitedRootTypes.removeAll(cachedRequest.acceptedRootTypes)
if (limitedRootTypes.isEmpty()) {
return null
}
else {
return doSearch(FindClassRequest(request.classId, limitedRootTypes), handler)
}
}
is SearchResult.Found -> {
if (cachedRequest.acceptedRootTypes == request.acceptedRootTypes) {
return handler(cachedResult.packageDirectory, cachedResult.root.type).result
}
}
}
return doSearch()
}
private fun doSearch(request: SearchRequest, handler: (VirtualFile, JavaRoot.RootType) -> HandleResult): T? {
val findClassRequest = request as? FindClassRequest
fun found(packageDirectory: VirtualFile, root: JavaRoot, result: T): T {
if (findClassRequest != null) {
lastClassSearch = Pair(findClassRequest, SearchResult.Found(packageDirectory, root))
}
return result
}
fun notFound(): T? {
if (findClassRequest != null) {
lastClassSearch = Pair(findClassRequest, SearchResult.NotFound)
}
return null
}
fun handle(root: JavaRoot, targetDirInRoot: VirtualFile): T? {
if (root.type in request.acceptedRootTypes) {
val (result, shouldContinue) = handler(targetDirInRoot, root.type)
if (!shouldContinue) {
return result
}
}
return null
}
// a list of package sub names, ["org", "jb", "kotlin"]
val packagesPath = request.packageFqName.pathSegments().map { it.getIdentifier() }
// a list of caches corresponding to packages, [default, "org", "org.jb", "org.jb.kotlin"]
val caches = cachesPath(packagesPath)
var processedRootsUpTo = -1
// traverse caches starting from last, which contains most specific information
// NOTE: indices manipulation instead of using caches.indices.reversed() is here for performance reasons
val cachesLastIndex = caches.lastIndex
for (cacheIndex in 0..cachesLastIndex) {
val reverseCacheIndex = cachesLastIndex - cacheIndex
val cache = caches[reverseCacheIndex]
for (i in 0..cache.rootIndices.size() - 1) {
val rootIndex = cache.rootIndices[i]
if (rootIndex <= processedRootsUpTo) continue // roots with those indices have been processed by now
val directoryInRoot = travelPath(rootIndex, packagesPath, reverseCacheIndex, caches) ?: continue
val root = roots[rootIndex]
val result = handle(root, directoryInRoot)
if (result != null) {
return found(directoryInRoot, root, result)
}
}
processedRootsUpTo = cache.rootIndices.lastOrNull() ?: processedRootsUpTo
}
return notFound()
}
// try to find a target directory corresponding to package represented by packagesPath in a given root reprenting by index
// possibly filling "Cache" objects with new information
private fun travelPath(rootIndex: Int, packagesPath: List, fillCachesAfter: Int, cachesPath: List): VirtualFile? {
if (rootIndex >= maxIndex) {
for (i in (fillCachesAfter + 1)..cachesPath.size() - 1) {
// we all know roots that contain this package by now
cachesPath[i].rootIndices.add(maxIndex)
cachesPath[i].rootIndices.trimToSize()
}
return null
}
var currentFile = roots[rootIndex].file
for (pathIndex in packagesPath.indices) {
val subPackageName = packagesPath[pathIndex]
currentFile = currentFile.findChild(subPackageName) ?: return null
val correspondingCacheIndex = pathIndex + 1
if (correspondingCacheIndex > fillCachesAfter) {
// subPackageName exists in this root
cachesPath[correspondingCacheIndex].rootIndices.add(rootIndex)
}
}
return currentFile
}
private fun cachesPath(path: List): List {
val caches = ArrayList()
caches.add(rootCache)
var currentCache = rootCache
for (subPackageName in path) {
currentCache = currentCache[subPackageName]
caches.add(currentCache)
}
return caches
}
private data class FindClassRequest(val classId: ClassId, override val acceptedRootTypes: Set) : SearchRequest {
override val packageFqName: FqName
get() = classId.getPackageFqName()
}
private data class TraverseRequest(
override val packageFqName: FqName,
override val acceptedRootTypes: Set
) : SearchRequest
private interface SearchRequest {
val packageFqName: FqName
val acceptedRootTypes: Set
}
private interface SearchResult {
class Found(val packageDirectory: VirtualFile, val root: JavaRoot) : SearchResult
object NotFound : SearchResult
}
}
private fun IntArrayList.lastOrNull() = if (isEmpty()) null else get(size() - 1)
private val IntArrayList.indices: IntRange get() = 0..size()-1
