preparing an operator call

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

@@ -280,6 +280,29 @@ fun MetadataProvider.newCallExpression(
     return node
 }
 
+/**
+ * Creates a new [MemberCallExpression]. 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.newOperatorCallExpression(
+    operatorCode: String,
+    callee: Expression?,
+    rawNode: Any? = null
+): OperatorCallExpression {
+    val node = OperatorCallExpression()
+    node.applyMetadata(
+        this,
+        operatorCode,
+        rawNode
+    )
+
+    log(node)
+    return node
+}
+
 /**
  * Creates a new [MemberCallExpression]. 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/statements/expressions/OperatorCallExpression.kt

@@ -0,0 +1,44 @@
+/*
+ * 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.statements.expressions
+
+import de.fraunhofer.aisec.cpg.graph.HasOperatorCode
+import de.fraunhofer.aisec.cpg.graph.Name
+import de.fraunhofer.aisec.cpg.graph.declarations.OperatorDeclaration
+
+/**
+ * This special call expression is used when an operator (such as a [BinaryOperator]) is overloaded.
+ * In this case, we replace the original [BinaryOperator] with an [OperatorCallExpression], which
+ * points to its respective [OperatorDeclaration].
+ */
+class OperatorCallExpression : CallExpression(), HasOperatorCode {
+
+    override val operatorCode: String? = null
+
+    override var name: Name
+        get() = Name(operatorCode ?: "")
+        set(_) {}
+}

cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/passes/SymbolResolver.kt

@@ -455,12 +455,12 @@ open class SymbolResolver(ctx: TranslationContext) : ComponentPass(ctx) {
             if (op != null) {
                 type = op.returnTypes.singleOrNull()?.root ?: unknownType()
 
-                // We need to insert a new call expression to our operator in between
+                // We need to insert a new operator call expression in between
                 val ref =
                     newMemberExpression(op.name, reference.base, operatorCode = ".")
                         .implicit(op.name.localName, location = reference.location)
                 ref.refersTo = op
-                var call = newMemberCallExpression(ref).codeAndLocationFrom(ref)
+                var call = newOperatorCallExpression(operatorCode = ".", ref).codeAndLocationFrom(ref)
                 call.invokes = listOf(op)
 
                 // Make the call our new base