Introduce 2 KLIB resolve strategies: "compiler" & "tooling"

Issue #KT-36213

compiler/util-klib/src/org/jetbrains/kotlin/library/SearchPathResolver.kt

@@ -238,14 +238,18 @@ class SingleKlibComponentResolver(
     override fun libraryComponentBuilder(file: File, isDefault: Boolean) = createKotlinLibraryComponents(file, isDefault)
 }
 
-fun resolveSingleFileKlib(
-    libraryFile: File,
-    logger: Logger = object : Logger {
-        override fun log(message: String) {}
-        override fun error(message: String) = kotlin.error("e: $message")
-        override fun warning(message: String) {}
-        override fun fatal(message: String) = kotlin.error("e: $message")
-    }
-): KotlinLibrary {
-    return SingleKlibComponentResolver(libraryFile.absolutePath, listOf(KotlinAbiVersion.CURRENT), logger).resolve(libraryFile.absolutePath)
+/**
+ * Resolves KLIB libraries by:
+ * - expanding the given library path to the real path that may or may not contain ".klib" extension
+ * - searching among user-supplied libraries by "unique_name" that matches the given library name
+ * - filtering out pre-1.4 libraries (with the old style layout)
+ * - filtering out library components that have different ABI version than the ABI version of the current compiler
+ *
+ * If no match found, fails with [Logger#fatal].
+ *
+ * Typical usage scenario: compiler.
+ */
+object CompilerSingleFileKlibResolveStrategy : SingleFileKlibResolveStrategy {
+    override fun resolve(libraryFile: File, logger: Logger) =
+        SingleKlibComponentResolver(libraryFile.absolutePath, listOf(KotlinAbiVersion.CURRENT), logger).resolve(libraryFile.absolutePath)
 }

compiler/util-klib/src/org/jetbrains/kotlin/library/SingleFileResolve.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2010-2020 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.library
+
+import org.jetbrains.kotlin.konan.file.File
+import org.jetbrains.kotlin.util.Logger
+
+interface SingleFileKlibResolveStrategy {
+    fun resolve(libraryFile: File, logger: Logger): KotlinLibrary
+}
+
+fun resolveSingleFileKlib(
+    libraryFile: File,
+    logger: Logger = object : Logger {
+        override fun log(message: String) {}
+        override fun error(message: String) = kotlin.error("e: $message")
+        override fun warning(message: String) {}
+        override fun fatal(message: String) = kotlin.error("e: $message")
+    },
+    strategy: SingleFileKlibResolveStrategy = CompilerSingleFileKlibResolveStrategy
+): KotlinLibrary = strategy.resolve(libraryFile, logger)

compiler/util-klib/src/org/jetbrains/kotlin/library/ToolingResolve.kt

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2010-2020 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.library
+
+import org.jetbrains.kotlin.konan.file.File
+import org.jetbrains.kotlin.library.impl.createKotlinLibrary
+import org.jetbrains.kotlin.util.Logger
+
+/**
+ * Resolves KLIB library by making sure that the library has 1.4+ layout with exactly one component.
+ * If it is not, then [resolve] does not fail and returns a fake [KotlinLibrary] instance with nonexistent component that can be
+ * treated by the callee but can't be read.
+ *
+ * The given library path is assumed to be absolute and pointing to the real KLIB.
+ * It's the responsibility of the callee to check this condition in the appropriate way.
+ *
+ * [ToolingSingleFileKlibResolveStrategy] does not perform any ABI or metadata version compatibility checks.
+ * It's the responsibility of the callee to check library versions in the appropriate way.
+ *
+ * Typical usage scenario: IDE.
+ */
+object ToolingSingleFileKlibResolveStrategy : SingleFileKlibResolveStrategy {
+    override fun resolve(libraryFile: File, logger: Logger): KotlinLibrary {
+        if (checkComponent(libraryFile)) {
+            // old style library
+            return fakeLibrary(libraryFile)
+        }
+
+        val componentFiles = libraryFile.listFiles.filter(::checkComponent)
+        componentFiles.singleOrNull()?.let { componentFile ->
+            // single component library
+            return createKotlinLibrary(libraryFile, componentFile.name)
+        }
+
+        // otherwise mimic as old style library and warn
+        if (componentFiles.isNotEmpty()) {
+            // TODO: choose the best fit among all available candidates
+
+            logger.warning("Library $libraryFile can not be read. Multiple components found: ${componentFiles.map {
+                it.path.substringAfter(libraryFile.path)
+            }}")
+        }
+
+        return fakeLibrary(libraryFile)
+    }
+
+    private const val NONEXISTENT_COMPONENT_NAME = "__nonexistent_component_name__"
+
+    private fun checkComponent(componentFile: File) = componentFile.child(KLIB_MANIFEST_FILE_NAME).isFile
+    private fun fakeLibrary(libraryFile: File) = createKotlinLibrary(libraryFile, NONEXISTENT_COMPONENT_NAME)
+}