Minor, invert JavaModule.isBinary -> isSourceModule

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/ClasspathRootsResolver.kt

@@ -161,7 +161,9 @@ class ClasspathRootsResolver(
     }
 
     private fun addModularRoots(modules: List<JavaModule>, result: MutableList<JavaRoot>) {
-        val sourceModules = modules.filterIsInstance<JavaModule.Explicit>().filterNot(JavaModule::isBinary)
+        // In current implementation, at most one source module is supported. This can be relaxed in the future if we support another
+        // compilation mode, similar to java's --module-source-path
+        val sourceModules = modules.filterIsInstance<JavaModule.Explicit>().filter(JavaModule::isSourceModule)
         if (sourceModules.size > 1) {
             for (module in sourceModules) {
                 report(ERROR, "Too many source module declarations found", module.moduleInfoFile)

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/modules/CliJavaModuleResolver.kt

@@ -32,12 +32,12 @@ class CliJavaModuleResolver(
         private val systemModules: List<JavaModule.Explicit>
 ) : JavaModuleResolver {
     init {
-        assert(userModules.count { !it.isBinary } <= 1) {
+        assert(userModules.count(JavaModule::isSourceModule) <= 1) {
             "Modules computed by ClasspathRootsResolver cannot have more than one source module: $userModules"
         }
     }
 
-    private val sourceModule: JavaModule? = userModules.firstOrNull { !it.isBinary }
+    private val sourceModule: JavaModule? = userModules.firstOrNull(JavaModule::isSourceModule)
 
     private fun findJavaModule(file: VirtualFile): JavaModule? {
         if (file.fileSystem.protocol == StandardFileSystems.JRT_PROTOCOL) {

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/modules/JavaModule.kt

@@ -16,7 +16,7 @@
 
 package org.jetbrains.kotlin.resolve.jvm.modules
 
-import com.intellij.ide.highlighter.JavaClassFileType
+import com.intellij.ide.highlighter.JavaFileType
 import com.intellij.openapi.vfs.VirtualFile
 import org.jetbrains.kotlin.name.FqName
 
@@ -41,10 +41,11 @@ interface JavaModule {
     val moduleInfoFile: VirtualFile?
 
     /**
-     * `true` if this module is either an automatic module on the module path, or an explicit module loaded from module-info.class.
-     * `false` if this module is an explicit module loaded from module-info.java.
+     * `true` if this module is an explicit module loaded from module-info.java, `false` otherwise. This usually corresponds to the module
+     * currently being compiled.
+     * Note that in case of partial/incremental compilation, the source module may contain both binary roots and non-binary roots.
      */
-    val isBinary: Boolean
+    val isSourceModule: Boolean
 
     /**
      * `true` if this module exports the package with the given FQ name to all dependent modules.
@@ -70,7 +71,7 @@ interface JavaModule {
     class Automatic(override val name: String, override val moduleRoots: List<Root>) : JavaModule {
         override val moduleInfoFile: VirtualFile? get() = null
 
-        override val isBinary: Boolean get() = true
+        override val isSourceModule: Boolean get() = false
 
         override fun exports(packageFqName: FqName): Boolean = true
 
@@ -87,8 +88,8 @@ interface JavaModule {
         override val name: String
             get() = moduleInfo.moduleName
 
-        override val isBinary: Boolean
-            get() = moduleInfoFile.fileType == JavaClassFileType.INSTANCE
+        override val isSourceModule: Boolean
+            get() = moduleInfoFile.fileType == JavaFileType.INSTANCE
 
         override fun exports(packageFqName: FqName): Boolean {
             return moduleInfo.exports.any { (fqName, toModules) ->