first draft problem nodes

cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/DeclarationBuilder.kt

@@ -403,6 +403,27 @@ fun MetadataProvider.newProblemDeclaration(
     return node
 }
 
+/**
+ * Creates a new [Problem]. The [MetadataProvider] receiver will be used to fill different meta-data
+ * using [Node.applyMetadata]. Calling this extension function outside of Kotlin requires an
+ * appropriate [MetadataProvider], such as a [LanguageFrontend] as an additional prepended argument.
+ */
+@JvmOverloads
+fun MetadataProvider.newProblem(
+    problem: String = "",
+    problemType: ProblemNode.ProblemType = ProblemNode.ProblemType.PARSING,
+    rawNode: Any? = null
+): Problem {
+    val node = Problem()
+    node.applyMetadata(this, EMPTY_NAME, rawNode, true)
+
+    node.problem = problem
+    node.problemType = problemType
+
+    log(node)
+    return node
+}
+
 /**
  * Creates a new [IncludeDeclaration]. The [MetadataProvider] receiver will be used to fill
  * different meta-data using [Node.applyMetadata]. Calling this extension function outside of Kotlin

cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/Node.kt

@@ -257,6 +257,12 @@ abstract class Node :
     @Relationship("ANNOTATIONS") var annotationEdges = astEdgesOf<Annotation>()
     var annotations by unwrapping(Node::annotationEdges)
 
+    /**
+     * Additional problem nodes. These nodes represent problems which occurred during processing of
+     * a node (i.e. only partially processed).
+     */
+    val additionalProblems: MutableSet<ProblemNode> = mutableSetOf()
+
     /**
      * If a node should be removed from the graph, just removing it from the AST is not enough (see
      * issue #60). It will most probably be referenced somewhere via DFG or EOG edges. Thus, if it

cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/Problem.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2024, Fraunhofer AISEC. All rights reserved.
+ *
+ * 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 de.fraunhofer.aisec.cpg.graph
+
+/** A problem node documenting that something failed. */
+data class Problem(
+    override var problem: String = "",
+    override var problemType: ProblemNode.ProblemType = ProblemNode.ProblemType.TRANSLATION
+) : ProblemNode, MetadataProvider, Node()