Avoid segfault when ClassInitializationInfo is wrong

Author: Christian Wimmer

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/classinitialization/ClassInitializationInfo.java

@@ -25,18 +25,20 @@
 package com.oracle.svm.core.classinitialization;
 
 // Checkstyle: stop
+
 import java.util.concurrent.locks.Condition;
 import java.util.concurrent.locks.ReentrantLock;
 
-import com.oracle.svm.core.jdk.InternalVMMethod;
 import org.graalvm.compiler.serviceprovider.GraalUnsafeAccess;
 import org.graalvm.nativeimage.Platform;
 import org.graalvm.nativeimage.Platforms;
 import org.graalvm.nativeimage.c.function.CFunctionPointer;
 
 import com.oracle.svm.core.annotate.InvokeJavaFunctionPointer;
 import com.oracle.svm.core.hub.DynamicHub;
+import com.oracle.svm.core.jdk.InternalVMMethod;
 import com.oracle.svm.core.snippets.SubstrateForeignCallTarget;
+import com.oracle.svm.core.util.VMError;
 
 import sun.misc.Unsafe;
 // Checkstyle: resume
@@ -294,7 +296,7 @@ private static void initialize(ClassInitializationInfo info, DynamicHub hub) {
         Throwable exception = null;
         try {
             /* Step 9: Next, execute the class or interface initialization method of C. */
-            info.invokeClassInitializer();
+            info.invokeClassInitializer(hub);
         } catch (Throwable ex) {
             exception = ex;
         }
@@ -372,9 +374,17 @@ private void setInitializationStateAndNotify(InitState state) {
         }
     }
 
-    private void invokeClassInitializer() {
+    private void invokeClassInitializer(DynamicHub hub) {
         if (classInitializer != null) {
-            ((ClassInitializerFunctionPointer) classInitializer.functionPointer).invoke();
+            ClassInitializerFunctionPointer functionPointer = (ClassInitializerFunctionPointer) classInitializer.functionPointer;
+            if (functionPointer.isNull()) {
+                throw invokeClassInitializerError(hub);
+            }
+            functionPointer.invoke();
         }
     }
+
+    private static RuntimeException invokeClassInitializerError(DynamicHub hub) {
+        throw VMError.shouldNotReachHere("No classInitializer.functionPointer for class " + hub.getName());
+    }
 }