src/hotspot/share/prims/jni.cpp

*** 3508,3517 ****
--- 3508,3607 ----
    JNIWrapper("GetModule");
    return Modules::get_module(clazz, THREAD);
  JNI_END
  
  
+ JNI_ENTRY(void*, jni_GetFlattenedArrayElements(JNIEnv* env, jarray array, jboolean* isCopy))
+   JNIWrapper("jni_GetFlattenedArrayElements");
+   if (isCopy != NULL) {
+     *isCopy = JNI_FALSE;
+   }
+   arrayOop ar = arrayOop(JNIHandles::resolve_non_null(array));
+   if (!ar->is_array()) {
+     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Not an array");
+   }
+   if (!ar->is_valueArray()) {
+     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Not a flattened array");
+   }
+   ValueArrayKlass* vak = ValueArrayKlass::cast(ar->klass());
+   if (vak->contains_oops()) {
+     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Flattened array contains oops");
+   }
+   oop a = lock_gc_or_pin_object(thread, array);
+   valueArrayOop vap = valueArrayOop(a);
+   void* ret = vap->value_at_addr(0, vak->layout_helper());
+   return ret;
+ JNI_END
+ 
+ JNI_ENTRY(void, jni_ReleaseFlattenedArrayElements(JNIEnv* env, jarray array, void* elem, jint mode))
+   JNIWrapper("jni_ReleaseFlattenedArrayElements");
+   unlock_gc_or_unpin_object(thread, array);
+ JNI_END
+ 
+ JNI_ENTRY(jsize, jni_GetFlattenedArrayElementSize(JNIEnv* env, jarray array)) {
+   JNIWrapper("jni_GetFlattenedElementSize");
+   arrayOop a = arrayOop(JNIHandles::resolve_non_null(array));
+   if (!a->is_array()) {
+     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Not an array");
+   }
+   if (!a->is_valueArray()) {
+     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Not a flattened array");
+   }
+   ValueArrayKlass* vak = ValueArrayKlass::cast(a->klass());
+   jsize ret = vak->element_byte_size();
+   return ret;
+ }
+ JNI_END
+ 
+ JNI_ENTRY(jclass, jni_GetFlattenedArrayElementClass(JNIEnv* env, jarray array))
+   JNIWrapper("jni_GetArrayElementClass");
+   arrayOop a = arrayOop(JNIHandles::resolve_non_null(array));
+   if (!a->is_array()) {
+     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Not an array");
+   }
+   if (!a->is_valueArray()) {
+     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Not a flattened array");
+   }
+   ValueArrayKlass* vak = ValueArrayKlass::cast(a->klass());
+   ValueKlass* vk = vak->element_klass();
+   return (jclass) JNIHandles::make_local(vk->java_mirror());
+ JNI_END
+ 
+ JNI_ENTRY(jsize, jni_GetFieldOffsetInFlattenedLayout(JNIEnv* env, jclass clazz, const char *name, const char *signature, jboolean* isFlattened))
+   JNIWrapper("jni_GetFieldOffsetInFlattenedLayout");
+ 
+   oop mirror = JNIHandles::resolve_non_null(clazz);
+   Klass* k = java_lang_Class::as_Klass(mirror);
+   if (!k->is_value()) {
+     ResourceMark rm;
+         THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), err_msg("%s has not flattened layout", k->external_name()));
+   }
+   ValueKlass* vk = ValueKlass::cast(k);
+ 
+   TempNewSymbol fieldname = SymbolTable::probe(name, (int)strlen(name));
+   TempNewSymbol signame = SymbolTable::probe(signature, (int)strlen(signature));
+   if (fieldname == NULL || signame == NULL) {
+     ResourceMark rm;
+     THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), err_msg("%s.%s %s", vk->external_name(), name, signature));
+   }
+ 
+   assert(vk->is_initialized(), "If a flattened array has been created, the element klass must have been initialized");
+ 
+   fieldDescriptor fd;
+   if (!vk->is_instance_klass() ||
+       !InstanceKlass::cast(vk)->find_field(fieldname, signame, false, &fd)) {
+     ResourceMark rm;
+     THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), err_msg("%s.%s %s", vk->external_name(), name, signature));
+   }
+ 
+   int offset = fd.offset() - vk->first_field_offset();
+   if (isFlattened != NULL) {
+     *isFlattened = fd.is_flattened();
+   }
+   return (jsize)offset;
+ JNI_END
+ 
  // Structure containing all jni functions
  struct JNINativeInterface_ jni_NativeInterface = {
      NULL,
      NULL,
      NULL,
*** 3791,3801 ****
  
      jni_GetObjectRefType,
  
      // Module features
  
!     jni_GetModule
  };
  
  
  // For jvmti use to modify jni function table.
  // Java threads in native contiues to run until it is transitioned
--- 3881,3899 ----
  
      jni_GetObjectRefType,
  
      // Module features
  
!     jni_GetModule,
! 
!     // Flattened arrays features
! 
!     jni_GetFlattenedArrayElements,
!     jni_ReleaseFlattenedArrayElements,
!     jni_GetFlattenedArrayElementClass,
!     jni_GetFlattenedArrayElementSize,
!     jni_GetFieldOffsetInFlattenedLayout
  };
  
  
  // For jvmti use to modify jni function table.
  // Java threads in native contiues to run until it is transitioned