Fix unnecessary reflection calls in the generated code #1353 (#1491)

Fix unnecessary reflection calls and infinite loop in self-reference initializations

Author: sofurihafe

utbot-framework/src/main/kotlin/org/utbot/framework/assemble/AssembleModelGenerator.kt

@@ -226,6 +226,8 @@ class AssembleModelGenerator(private val basePackageName: String) {
             assembleModel
         }
 
+    private val modelsInAnalysis = mutableListOf<UtCompositeModel>()
+
     /**
      * Assembles internal structure of [UtCompositeModel] if possible and handles assembling exceptions.
      */
@@ -243,7 +245,14 @@ class AssembleModelGenerator(private val basePackageName: String) {
             val constructorId = findBestConstructorOrNull(compositeModel)
                 ?: throw AssembleException("No default constructor to instantiate an object of the class ${compositeModel.classId}")
 
-            val constructorInfo = constructorAnalyzer.analyze(constructorId)
+            // we do not analyze a constructor which is currently in the analysis
+            // thus, we do not encounter an infinite loop in self or cross-reference situations
+            val shouldAnalyzeConstructor = compositeModel !in modelsInAnalysis
+            modelsInAnalysis.add(compositeModel)
+
+            val constructorInfo =
+                if (shouldAnalyzeConstructor) constructorAnalyzer.analyze(constructorId)
+                else ConstructorAssembleInfo(constructorId)
 
             val instantiationCall = constructorCall(compositeModel, constructorInfo)
             return UtAssembleModel(
@@ -284,6 +293,8 @@ class AssembleModelGenerator(private val basePackageName: String) {
         } catch (e: AssembleException) {
             instantiatedModels.remove(compositeModel)
             throw e
+        } finally {
+            modelsInAnalysis.remove(compositeModel)
         }
     }
 

utbot-framework/src/main/kotlin/org/utbot/framework/modifications/ConstructorAnalyzer.kt

@@ -33,9 +33,9 @@ import soot.jimple.internal.JimpleLocal
  * */
 data class ConstructorAssembleInfo(
     val constructorId: ConstructorId,
-    val params: Map<Int, FieldId>,
-    val setFields: Set<FieldId>,
-    val affectedFields: Set<FieldId>
+    val params: Map<Int, FieldId> = mapOf(),
+    val setFields: Set<FieldId> = setOf(),
+    val affectedFields: Set<FieldId> = setOf()
 )
 
 /**
@@ -109,18 +109,11 @@ class ConstructorAnalyzer {
         return jimpleLocal.name.first() != '$'
     }
 
-    private val visitedConstructors = mutableSetOf<SootMethod>()
-
     private fun analyze(
         sootConstructor: SootMethod,
         setFields: MutableSet<FieldId>,
         affectedFields: MutableSet<FieldId>,
     ): Map<Int, FieldId> {
-        if (sootConstructor in visitedConstructors) {
-            return emptyMap()
-        }
-        visitedConstructors.add(sootConstructor)
-
         val jimpleBody = retrieveJimpleBody(sootConstructor) ?: return emptyMap()
         analyzeAssignments(jimpleBody, setFields, affectedFields)