1 /*
2  * Copyright (C) 2011 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 "array-inl.h"
18 
19 #include "array-alloc-inl.h"
20 #include "base/utils.h"
21 #include "class-inl.h"
22 #include "class.h"
23 #include "class_linker-inl.h"
24 #include "class_root.h"
25 #include "common_throws.h"
26 #include "dex/dex_file-inl.h"
27 #include "gc/accounting/card_table-inl.h"
28 #include "handle_scope-inl.h"
29 #include "object-inl.h"
30 #include "object_array-alloc-inl.h"
31 #include "object_array-inl.h"
32 #include "thread.h"
33 
34 namespace art {
35 namespace mirror {
36 
37 using android::base::StringPrintf;
38 
39 // Create a multi-dimensional array of Objects or primitive types.
40 //
41 // We have to generate the names for X[], X[][], X[][][], and so on.  The
42 // easiest way to deal with that is to create the full name once and then
43 // subtract pieces off.  Besides, we want to start with the outermost
44 // piece and work our way in.
45 // Recursively create an array with multiple dimensions.  Elements may be
46 // Objects or primitive types.
RecursiveCreateMultiArray(Thread * self,Handle<Class> array_class,int current_dimension,Handle<mirror::IntArray> dimensions)47 static ObjPtr<Array> RecursiveCreateMultiArray(Thread* self,
48                                                Handle<Class> array_class,
49                                                int current_dimension,
50                                                Handle<mirror::IntArray> dimensions)
51     REQUIRES_SHARED(Locks::mutator_lock_) {
52   int32_t array_length = dimensions->Get(current_dimension);
53   StackHandleScope<2> hs(self);
54   Handle<mirror::Class> h_component_type(hs.NewHandle(array_class->GetComponentType()));
55   size_t component_size_shift = h_component_type->GetPrimitiveTypeSizeShift();
56   gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
57   Handle<Array> new_array(hs.NewHandle(
58       Array::Alloc(self, array_class.Get(), array_length, component_size_shift, allocator_type)));
59   if (UNLIKELY(new_array == nullptr)) {
60     CHECK(self->IsExceptionPending());
61     return nullptr;
62   }
63   if (current_dimension + 1 < dimensions->GetLength()) {
64     // Create a new sub-array in every element of the array.
65     for (int32_t i = 0; i < array_length; i++) {
66       ObjPtr<Array> sub_array =
67           RecursiveCreateMultiArray(self, h_component_type, current_dimension + 1, dimensions);
68       if (UNLIKELY(sub_array == nullptr)) {
69         CHECK(self->IsExceptionPending());
70         return nullptr;
71       }
72       // Use non-transactional mode without check.
73       new_array->AsObjectArray<Array>()->Set<false, false>(i, sub_array);
74     }
75   }
76   return new_array.Get();
77 }
78 
CreateMultiArray(Thread * self,Handle<Class> element_class,Handle<IntArray> dimensions)79 ObjPtr<Array> Array::CreateMultiArray(Thread* self,
80                                       Handle<Class> element_class,
81                                       Handle<IntArray> dimensions) {
82   // Verify dimensions.
83   //
84   // The caller is responsible for verifying that "dimArray" is non-null
85   // and has a length > 0 and <= 255.
86   int num_dimensions = dimensions->GetLength();
87   DCHECK_GT(num_dimensions, 0);
88   DCHECK_LE(num_dimensions, 255);
89 
90   for (int i = 0; i < num_dimensions; i++) {
91     int dimension = dimensions->Get(i);
92     if (UNLIKELY(dimension < 0)) {
93       ThrowNegativeArraySizeException(StringPrintf("Dimension %d: %d", i, dimension).c_str());
94       return nullptr;
95     }
96   }
97 
98   // Find/generate the array class.
99   ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
100   StackHandleScope<1> hs(self);
101   MutableHandle<mirror::Class> array_class(
102       hs.NewHandle(class_linker->FindArrayClass(self, element_class.Get())));
103   if (UNLIKELY(array_class == nullptr)) {
104     CHECK(self->IsExceptionPending());
105     return nullptr;
106   }
107   for (int32_t i = 1; i < dimensions->GetLength(); ++i) {
108     array_class.Assign(class_linker->FindArrayClass(self, array_class.Get()));
109     if (UNLIKELY(array_class == nullptr)) {
110       CHECK(self->IsExceptionPending());
111       return nullptr;
112     }
113   }
114   // Create the array.
115   ObjPtr<Array> new_array = RecursiveCreateMultiArray(self, array_class, 0, dimensions);
116   if (UNLIKELY(new_array == nullptr)) {
117     CHECK(self->IsExceptionPending());
118   }
119   return new_array.Ptr();
120 }
121 
122 template<typename T>
Alloc(Thread * self,size_t length)123 ObjPtr<PrimitiveArray<T>> PrimitiveArray<T>::Alloc(Thread* self, size_t length) {
124   gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
125   ObjPtr<Array> raw_array = Array::Alloc(self,
126                                          GetClassRoot<PrimitiveArray<T>>(),
127                                          length,
128                                          ComponentSizeShiftWidth(sizeof(T)),
129                                          allocator_type);
130   return ObjPtr<PrimitiveArray<T>>::DownCast(raw_array);
131 }
132 
ThrowArrayIndexOutOfBoundsException(int32_t index)133 void Array::ThrowArrayIndexOutOfBoundsException(int32_t index) {
134   art::ThrowArrayIndexOutOfBoundsException(index, GetLength());
135 }
136 
ThrowArrayStoreException(ObjPtr<Object> object)137 void Array::ThrowArrayStoreException(ObjPtr<Object> object) {
138   art::ThrowArrayStoreException(object->GetClass(), this->GetClass());
139 }
140 
CopyOf(Handle<Array> h_this,Thread * self,int32_t new_length)141 ObjPtr<Array> Array::CopyOf(Handle<Array> h_this, Thread* self, int32_t new_length) {
142   ObjPtr<Class> klass = h_this->GetClass();
143   CHECK(klass->IsPrimitiveArray()) << "Will miss write barriers";
144   DCHECK_GE(new_length, 0);
145   auto* heap = Runtime::Current()->GetHeap();
146   gc::AllocatorType allocator_type = heap->IsMovableObject(h_this.Get())
147       ? heap->GetCurrentAllocator()
148       : heap->GetCurrentNonMovingAllocator();
149   const auto component_size = klass->GetComponentSize();
150   const auto component_shift = klass->GetComponentSizeShift();
151   ObjPtr<Array> new_array =
152       Alloc(self, klass, new_length, component_shift, allocator_type);  // Invalidates klass.
153   if (LIKELY(new_array != nullptr)) {
154     memcpy(new_array->GetRawData(component_size, 0),
155            h_this->GetRawData(component_size, 0),
156            std::min(h_this->GetLength(), new_length) << component_shift);
157   }
158   return new_array;
159 }
160 
161 // Explicitly instantiate all the primitive array types.
162 template class PrimitiveArray<uint8_t>;   // BooleanArray
163 template class PrimitiveArray<int8_t>;    // ByteArray
164 template class PrimitiveArray<uint16_t>;  // CharArray
165 template class PrimitiveArray<double>;    // DoubleArray
166 template class PrimitiveArray<float>;     // FloatArray
167 template class PrimitiveArray<int32_t>;   // IntArray
168 template class PrimitiveArray<int64_t>;   // LongArray
169 template class PrimitiveArray<int16_t>;   // ShortArray
170 
171 }  // namespace mirror
172 }  // namespace art
173