Brian Carlstrom | 5b8e4c8 | 2011-09-18 01:38:59 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "jni_internal.h" |
| 18 | #include "class_linker.h" |
| 19 | #include "object.h" |
| 20 | |
| 21 | #include "JniConstants.h" // Last to avoid problems with LOG redefinition. |
| 22 | |
| 23 | namespace art { |
| 24 | |
| 25 | namespace { |
| 26 | |
| 27 | |
| 28 | // Recursively create an array with multiple dimensions. Elements may be |
| 29 | // Objects or primitive types. |
| 30 | // |
| 31 | // The dimension we're creating is in dimensions[0], so when we recurse |
| 32 | // we advance the pointer. |
| 33 | Array* CreateMultiArray(Class* array_class, int current_dimension, IntArray* dimensions) { |
| 34 | int32_t array_length = dimensions->Get(current_dimension++); |
| 35 | Array* new_array = Array::Alloc(array_class, array_length); |
| 36 | if (new_array == NULL) { |
| 37 | CHECK(Thread::Current()->IsExceptionPending()); |
| 38 | return NULL; |
| 39 | } |
| 40 | if (current_dimension == dimensions->GetLength()) { |
| 41 | return new_array; |
| 42 | } |
| 43 | |
| 44 | if (!array_class->GetComponentType()->IsArrayClass()) { |
| 45 | // TODO: throw an exception, not relying on class_linker->FindClass to throw. |
| 46 | // old code assumed this but if you recurse from "[Foo" to "Foo" to "oo", |
| 47 | // you shouldn't assume there isn't a class "oo". |
| 48 | } |
| 49 | std::string sub_array_descriptor(array_class->GetDescriptor()->ToModifiedUtf8(), 1); |
| 50 | ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| 51 | Class* sub_array_class = class_linker->FindClass(sub_array_descriptor, |
| 52 | array_class->GetClassLoader()); |
| 53 | if (sub_array_class == NULL) { |
| 54 | CHECK(Thread::Current()->IsExceptionPending()); |
| 55 | return NULL; |
| 56 | } |
| 57 | DCHECK(sub_array_class->IsArrayClass()); |
| 58 | // Create a new sub-array in every element of the array. |
| 59 | ObjectArray<Array>* object_array = new_array->AsObjectArray<Array>(); |
| 60 | for (int32_t i = 0; i < array_length; i++) { |
| 61 | Array* sub_array = CreateMultiArray(sub_array_class, current_dimension, dimensions); |
| 62 | if (sub_array == NULL) { |
| 63 | CHECK(Thread::Current()->IsExceptionPending()); |
| 64 | return NULL; |
| 65 | } |
| 66 | object_array->Set(i, sub_array); |
| 67 | } |
| 68 | return new_array; |
| 69 | } |
| 70 | |
| 71 | // Create a multi-dimensional array of Objects or primitive types. |
| 72 | // |
| 73 | // We have to generate the names for X[], X[][], X[][][], and so on. The |
| 74 | // easiest way to deal with that is to create the full name once and then |
| 75 | // subtract pieces off. Besides, we want to start with the outermost |
| 76 | // piece and work our way in. |
| 77 | jobject Array_createMultiArray(JNIEnv* env, jclass, jclass javaElementClass, jobject javaDimArray) { |
| 78 | DCHECK(javaElementClass != NULL); |
| 79 | Class* element_class = Decode<Class*>(env, javaElementClass); |
| 80 | DCHECK(element_class->IsClass()); |
| 81 | DCHECK(javaDimArray != NULL); |
| 82 | Object* dimensions_obj = Decode<Class*>(env, javaDimArray); |
| 83 | DCHECK(dimensions_obj->IsArrayInstance()); |
| 84 | DCHECK(dimensions_obj->GetClass()->GetDescriptor()->Equals("[I")); |
| 85 | IntArray* dimensions_array = down_cast<IntArray*>(dimensions_obj); |
| 86 | |
| 87 | // Verify dimensions. |
| 88 | // |
| 89 | // The caller is responsible for verifying that "dimArray" is non-null |
| 90 | // and has a length > 0 and <= 255. |
| 91 | int num_dimensions = dimensions_array->GetLength(); |
| 92 | DCHECK_GT(num_dimensions, 0); |
| 93 | DCHECK_LE(num_dimensions, 255); |
| 94 | |
| 95 | for (int i = 0; i < num_dimensions; i++) { |
| 96 | if (dimensions_array->Get(i) < 0) { |
| 97 | UNIMPLEMENTED(FATAL) << "ThrowNegativeArraySizeException(dimensions[i])"; |
| 98 | return NULL; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | // Generate the full name of the array class. |
| 103 | std::string descriptor(num_dimensions, '['); |
| 104 | descriptor += element_class->GetDescriptor()->ToModifiedUtf8(); |
| 105 | |
| 106 | // Find/generate the array class. |
| 107 | ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| 108 | Class* array_class = class_linker->FindClass(descriptor, element_class->GetClassLoader()); |
| 109 | if (array_class == NULL) { |
| 110 | CHECK(Thread::Current()->IsExceptionPending()); |
| 111 | return NULL; |
| 112 | } |
| 113 | // create the array |
| 114 | Array* new_array = CreateMultiArray(array_class, 0, dimensions_array); |
| 115 | if (new_array == NULL) { |
| 116 | CHECK(Thread::Current()->IsExceptionPending()); |
| 117 | return NULL; |
| 118 | } |
| 119 | return AddLocalReference<jobject>(env, new_array); |
| 120 | } |
| 121 | |
| 122 | jobject Array_createObjectArray(JNIEnv* env, jclass, jclass javaElementClass, jint length) |
| 123 | { |
| 124 | DCHECK(javaElementClass != NULL); |
| 125 | Class* element_class = Decode<Class*>(env, javaElementClass); |
| 126 | if (length < 0) { |
| 127 | UNIMPLEMENTED(FATAL) << "ThrowNegativeArraySizeException(length)"; |
| 128 | return NULL; |
| 129 | } |
| 130 | std::string descriptor; |
| 131 | descriptor += '['; |
| 132 | descriptor += element_class->GetDescriptor()->ToModifiedUtf8(); |
| 133 | |
| 134 | ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| 135 | Class* array_class = class_linker->FindClass(descriptor, element_class->GetClassLoader()); |
| 136 | if (array_class == NULL) { |
| 137 | CHECK(Thread::Current()->IsExceptionPending()); |
| 138 | return NULL; |
| 139 | } |
| 140 | DCHECK(array_class->IsArrayClass()); |
| 141 | Array* new_array = Array::Alloc(array_class, length); |
| 142 | if (new_array == NULL) { |
| 143 | CHECK(Thread::Current()->IsExceptionPending()); |
| 144 | return NULL; |
| 145 | } |
| 146 | return AddLocalReference<jobject>(env, new_array); |
| 147 | } |
| 148 | |
| 149 | static JNINativeMethod gMethods[] = { |
| 150 | NATIVE_METHOD(Array, createMultiArray, "(Ljava/lang/Class;[I)Ljava/lang/Object;"), |
| 151 | NATIVE_METHOD(Array, createObjectArray, "(Ljava/lang/Class;I)Ljava/lang/Object;"), |
| 152 | }; |
| 153 | |
| 154 | } // namespace |
| 155 | |
| 156 | void register_java_lang_reflect_Array(JNIEnv* env) { |
| 157 | jniRegisterNativeMethods(env, "java/lang/reflect/Array", gMethods, NELEM(gMethods)); |
| 158 | } |
| 159 | |
| 160 | } // namespace art |