Kotlin: Record that generated data class members are compiler-generated

Author: igfoo

java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt

@@ -783,6 +783,9 @@ open class KotlinFileExtractor(
                     val methodId = id.cast<DbMethod>()
                     tw.writeMethods(methodId, shortName.nameInDB, "${shortName.nameInDB}$paramsSignature", returnType.javaResult.id, parentId, sourceDeclaration.cast<DbMethod>())
                     tw.writeMethodsKotlinType(methodId, returnType.kotlinResult.id)
+                    if (f.origin == IrDeclarationOrigin.GENERATED_DATA_CLASS_MEMBER) {
+                        tw.writeCompiler_generated(methodId, 2)
+                    }
 
                     if (extractMethodAndParameterTypeAccesses) {
                         extractTypeAccessRecursive(substReturnType, locId, id, -1)

java/ql/lib/config/semmlecode.dbscheme

@@ -1211,10 +1211,15 @@ ktPropertyDelegates(
   unique int variableId: @variable ref
 )
 
+/**
+ * If `id` is a compiler generated element, then the kind indicates the
+ * reason that the compiler generated it.
+ * See `Element.compilerGeneratedReason()` for an explanation of what
+ * each `kind` means.
+ */
 compiler_generated(
   unique int id: @element ref,
   int kind: int ref
-  // 1: Declaring classes of adapter functions in Kotlin
 )
 
 ktFunctionOriginalNames(

java/ql/lib/semmle/code/java/Element.qll

@@ -44,6 +44,15 @@ class Element extends @element, Top {
 
   /** Holds if this is an auxiliary program element generated by the compiler. */
   predicate isCompilerGenerated() { compiler_generated(this, _) }
+
+  /** Gets the reason this element was generated by the compiler, if any. */
+  string compilerGeneratedReason() {
+    exists(int i | compiler_generated(this, i) |
+      i = 1 and result = "Declaring classes of adapter functions in Kotlin"
+      or
+      i = 2 and result = "Generated data class members"
+    )
+  }
 }
 
 /**