feat(core) EspressoVM compatibility

modules/lwjgl/core/src/main/java/org/lwjgl/system/ThreadLocalUtil.java

@@ -90,6 +90,14 @@ be easy to workaround (attaching the agent at startup, making sure no contexts a
     /** The global JNIEnv. */
     private static final long JNI_NATIVE_INTERFACE = memGetAddress(getThreadJNIEnv());
 
+    /** The offset in JNIEnv at which to store the pointer to the capabilities array. */
+    private static final int CAPABILITIES_OFFSET = 3 * POINTER_SIZE;
+
+    // OpenJDK: NULL
+    // EspressoVM: NULL
+    // GraalVM Native Image: pointer to UnimplementedWithJNIEnvArgument function (see #875)
+    private static long RESERVED3_NULL = memGetAddress(JNI_NATIVE_INTERFACE + CAPABILITIES_OFFSET);
+
     /** The number of pointers in the JNIEnv struct. */
     private static final int JNI_NATIVE_INTERFACE_FUNCTION_COUNT;
 
@@ -103,9 +111,6 @@ be easy to workaround (attaching the agent at startup, making sure no contexts a
      */
     private static long FUNCTION_MISSING_ABORT_TABLE = NULL;
 
-    /** The offset in JNIEnv at which to store the pointer to the capabilities array. */
-    private static final int CAPABILITIES_OFFSET = 3 * POINTER_SIZE;
-
     static {
         int JNI_VERSION = GetVersion();
 
@@ -184,21 +189,17 @@ public static void setCapabilities(long capabilities) {
 
     // Ensures FUNCTION_MISSING_ABORT will be called even if no context is current,
     public static void setFunctionMissingAddresses(int functionCount) {
-        // OpenJDK: NULL
-        // GraalVM Native Image: pointer to UnimplementedWithJNIEnvArgument function (see #875)
-        long RESERVED0_NULL = memGetAddress(JNI_NATIVE_INTERFACE);
-
         long ptr = JNI_NATIVE_INTERFACE + CAPABILITIES_OFFSET;
 
         long currentTable = memGetAddress(ptr);
         if (functionCount == 0) {
-            if (currentTable != RESERVED0_NULL) {
+            if (currentTable != RESERVED3_NULL) {
                 FUNCTION_MISSING_ABORT_TABLE = NULL;
                 getAllocator().free(currentTable);
                 memPutAddress(ptr, NULL);
             }
         } else {
-            if (currentTable != RESERVED0_NULL) {
+            if (currentTable != RESERVED3_NULL) {
                 throw new IllegalStateException("setFunctionMissingAddresses has been called already");
             }
             if (currentTable != NULL) {
@@ -233,4 +234,4 @@ public static boolean areCapabilitiesDifferent(PointerBuffer ref, PointerBuffer
         return false;
     }
 
-}
+}