Wrong method reference for private method calls in Java 11 bytecode #140

Author: lehvolk

jacodb-core/src/main/kotlin/org/jacodb/impl/cfg/TypedMethodRefImpl.kt

@@ -38,6 +38,10 @@ abstract class MethodSignatureRef(
         private val alwaysTrue: (JcTypedMethod) -> Boolean = { true }
     }
 
+    private fun predicate(additionalFilter: (JcTypedMethod) -> Boolean = alwaysTrue): (JcTypedMethod) -> Boolean = {
+        it.name == name && additionalFilter(it) && it.method.description == description
+    }
+
     protected val description: String = buildString {
         append("(")
         argTypes.forEach {
@@ -48,17 +52,16 @@ abstract class MethodSignatureRef(
     }
 
     private fun List<JcTypedMethod>.findMethod(filter: (JcTypedMethod) -> Boolean = alwaysTrue): JcTypedMethod? {
-        return firstOrNull { it.name == name && filter(it) && it.method.description == description }
+        return firstOrNull(predicate(filter))
     }
 
     protected fun JcClassType.findTypedMethod(filter: (JcTypedMethod) -> Boolean = alwaysTrue): JcTypedMethod {
-        return findMethodOrNull(filter) ?: throw IllegalStateException(this.methodNotFoundMessage)
+        return findMethodOrNull(predicate(filter)) ?: throw IllegalStateException(this.methodNotFoundMessage)
     }
 
     protected fun JcClassType.findTypedMethodOrNull(filter: (JcTypedMethod) -> Boolean = alwaysTrue): JcTypedMethod? {
-        var methodOrNull = findMethodOrNull {
-            it.name == name && filter(it) && it.method.description == description
-        }
+        var methodOrNull = findMethodOrNull(predicate(filter))
+
         if (methodOrNull == null && jcClass.packageName == "java.lang.invoke") {
             methodOrNull = findMethodOrNull {
                 val method = it.method
@@ -194,11 +197,11 @@ class VirtualMethodRefImpl(
     }
 
     override val method: JcTypedMethod by softLazy {
-        actualType.findTypedMethodOrNull { !it.isPrivate } ?: declaredMethod
+        actualType.findTypedMethodOrNull() ?: declaredMethod
     }
 
     override val declaredMethod: JcTypedMethod by softLazy {
-        type.findTypedMethod { !it.isPrivate }
+        type.findTypedMethod()
     }
 }
 

jacodb-core/src/test/kotlin/org/jacodb/testing/cfg/InstructionsTest.kt

@@ -29,12 +29,12 @@ import org.jacodb.api.ext.cfg.callExpr
 import org.jacodb.api.ext.cfg.locals
 import org.jacodb.api.ext.cfg.values
 import org.jacodb.testing.BaseTest
+import org.jacodb.testing.Common
 import org.jacodb.testing.WithDB
 import org.jacodb.testing.cfg.RealMethodResolution.Virtual
 import org.jacodb.testing.cfg.RealMethodResolution.VirtualImpl
-import org.jacodb.testing.structure.FieldsAndMethods
 import org.jacodb.testing.primitives.Primitives
-import org.jacodb.testing.Common
+import org.jacodb.testing.structure.FieldsAndMethods
 import org.junit.jupiter.api.Assertions.*
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.condition.DisabledOnJre
@@ -244,6 +244,15 @@ class InstructionsTest : BaseTest() {
         assertEquals(cp.boolean, fieldBoolean.fieldType)
     }
 
+    @Test
+    fun `private call with invokevirtual instruction`() {
+        val clazz = cp.findClass("VirtualInstructions")
+        val instList = clazz.declaredMethods.first { it.name == "run" }.instList
+        val callDoSmth = instList.mapNotNull { it.callExpr }. first {
+            it.toString().contains("doSmth")
+        }
+        assertEquals("doSmth", callDoSmth.method.method.name)
+    }
 }
 
 fun JcMethod.dumpInstructions(): String {