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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "jni_internal.h"
#include "class_linker.h"
#include "object.h"
#include "JniConstants.h" // Last to avoid problems with LOG redefinition.
namespace art {
namespace {
// Recursively create an array with multiple dimensions. Elements may be
// Objects or primitive types.
Array* CreateMultiArray(Class* array_class, int current_dimension, IntArray* dimensions) {
int32_t array_length = dimensions->Get(current_dimension++);
SirtRef<Array> new_array(Array::Alloc(array_class, array_length));
if (new_array.get() == NULL) {
CHECK(Thread::Current()->IsExceptionPending());
return NULL;
}
if (current_dimension == dimensions->GetLength()) {
return new_array.get();
}
if (!array_class->GetComponentType()->IsArrayClass()) {
// TODO: throw an exception, not relying on class_linker->FindClass to throw.
// old code assumed this but if you recurse from "[Foo" to "Foo" to "oo",
// you shouldn't assume there isn't a class "oo".
}
std::string sub_array_descriptor(array_class->GetDescriptor()->ToModifiedUtf8(), 1);
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
Class* sub_array_class = class_linker->FindClass(sub_array_descriptor,
array_class->GetClassLoader());
if (sub_array_class == NULL) {
CHECK(Thread::Current()->IsExceptionPending());
return NULL;
}
DCHECK(sub_array_class->IsArrayClass());
// Create a new sub-array in every element of the array.
SirtRef<ObjectArray<Array> > object_array(new_array->AsObjectArray<Array>());
for (int32_t i = 0; i < array_length; i++) {
SirtRef<Array> sub_array(CreateMultiArray(sub_array_class, current_dimension, dimensions));
if (sub_array.get() == NULL) {
CHECK(Thread::Current()->IsExceptionPending());
return NULL;
}
object_array->Set(i, sub_array.get());
}
return new_array.get();
}
// Create a multi-dimensional array of Objects or primitive types.
//
// We have to generate the names for X[], X[][], X[][][], and so on. The
// easiest way to deal with that is to create the full name once and then
// subtract pieces off. Besides, we want to start with the outermost
// piece and work our way in.
jobject Array_createMultiArray(JNIEnv* env, jclass, jclass javaElementClass, jobject javaDimArray) {
ScopedThreadStateChange tsc(Thread::Current(), Thread::kRunnable);
DCHECK(javaElementClass != NULL);
Class* element_class = Decode<Class*>(env, javaElementClass);
DCHECK(element_class->IsClass());
DCHECK(javaDimArray != NULL);
Object* dimensions_obj = Decode<Class*>(env, javaDimArray);
DCHECK(dimensions_obj->IsArrayInstance());
DCHECK(dimensions_obj->GetClass()->GetDescriptor()->Equals("[I"));
IntArray* dimensions_array = down_cast<IntArray*>(dimensions_obj);
// Verify dimensions.
//
// The caller is responsible for verifying that "dimArray" is non-null
// and has a length > 0 and <= 255.
int num_dimensions = dimensions_array->GetLength();
DCHECK_GT(num_dimensions, 0);
DCHECK_LE(num_dimensions, 255);
for (int i = 0; i < num_dimensions; i++) {
int dimension = dimensions_array->Get(i);
if (dimension < 0) {
Thread::Current()->ThrowNewExceptionF("Ljava/lang/NegativeArraySizeException;",
"Dimension %d: %d", i, dimension);
return NULL;
}
}
// Generate the full name of the array class.
std::string descriptor(num_dimensions, '[');
descriptor += element_class->GetDescriptor()->ToModifiedUtf8();
// Find/generate the array class.
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
Class* array_class = class_linker->FindClass(descriptor, element_class->GetClassLoader());
if (array_class == NULL) {
CHECK(Thread::Current()->IsExceptionPending());
return NULL;
}
// create the array
Array* new_array = CreateMultiArray(array_class, 0, dimensions_array);
if (new_array == NULL) {
CHECK(Thread::Current()->IsExceptionPending());
return NULL;
}
return AddLocalReference<jobject>(env, new_array);
}
jobject Array_createObjectArray(JNIEnv* env, jclass, jclass javaElementClass, jint length)
{
ScopedThreadStateChange tsc(Thread::Current(), Thread::kRunnable);
DCHECK(javaElementClass != NULL);
Class* element_class = Decode<Class*>(env, javaElementClass);
if (length < 0) {
Thread::Current()->ThrowNewExceptionF("Ljava/lang/NegativeArraySizeException;", "%d", length);
return NULL;
}
std::string descriptor;
descriptor += '[';
descriptor += element_class->GetDescriptor()->ToModifiedUtf8();
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
Class* array_class = class_linker->FindClass(descriptor, element_class->GetClassLoader());
if (array_class == NULL) {
CHECK(Thread::Current()->IsExceptionPending());
return NULL;
}
DCHECK(array_class->IsArrayClass());
Array* new_array = Array::Alloc(array_class, length);
if (new_array == NULL) {
CHECK(Thread::Current()->IsExceptionPending());
return NULL;
}
return AddLocalReference<jobject>(env, new_array);
}
static JNINativeMethod gMethods[] = {
NATIVE_METHOD(Array, createMultiArray, "(Ljava/lang/Class;[I)Ljava/lang/Object;"),
NATIVE_METHOD(Array, createObjectArray, "(Ljava/lang/Class;I)Ljava/lang/Object;"),
};
} // namespace
void register_java_lang_reflect_Array(JNIEnv* env) {
jniRegisterNativeMethods(env, "java/lang/reflect/Array", gMethods, NELEM(gMethods));
}
} // namespace art