quick_cast_entrypoints.cc revision ea46f950e7a51585db293cd7f047de190a482414 
1/*
2 * Copyright (C) 2012 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 "callee_save_frame.h"
18#include "entrypoints/entrypoint_utils.h"
19#include "mirror/class-inl.h"
20#include "mirror/object-inl.h"
21#include "mirror/object_array-inl.h"
22
23namespace art {
24
25// Assignable test for code, won't throw.  Null and equality tests already performed
26extern "C" uint32_t artIsAssignableFromCode(const mirror::Class* klass,
27                                            const mirror::Class* ref_class)
28    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
29  DCHECK(klass != NULL);
30  DCHECK(ref_class != NULL);
31  return klass->IsAssignableFrom(ref_class) ? 1 : 0;
32}
33
34// Check whether it is safe to cast one class to the other, throw exception and return -1 on failure
35extern "C" int artCheckCastFromCode(mirror::Class* src_type, mirror::Class* dest_type,
36                                    Thread* self, mirror::ArtMethod** sp)
37    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
38  DCHECK(src_type->IsClass()) << PrettyClass(src_type);
39  DCHECK(dest_type->IsClass()) << PrettyClass(dest_type);
40  if (LIKELY(dest_type->IsAssignableFrom(src_type))) {
41    return 0;  // Success
42  } else {
43    FinishCalleeSaveFrameSetup(self, sp, Runtime::kRefsOnly);
44    ThrowClassCastException(dest_type, src_type);
45    return -1;  // Failure
46  }
47}
48
49// Tests whether 'element' can be assigned into an array of type 'array_class'.
50// Returns 0 on success and -1 if an exception is pending.
51extern "C" int artCanPutArrayElementFromCode(const mirror::Object* element,
52                                             const mirror::Class* array_class,
53                                             Thread* self, mirror::ArtMethod** sp)
54    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
55  DCHECK(array_class != NULL);
56  // element can't be NULL as we catch this is screened in runtime_support
57  mirror::Class* element_class = element->GetClass();
58  mirror::Class* component_type = array_class->GetComponentType();
59  if (LIKELY(component_type->IsAssignableFrom(element_class))) {
60    return 0;  // Success
61  } else {
62    FinishCalleeSaveFrameSetup(self, sp, Runtime::kRefsOnly);
63    ThrowArrayStoreException(element_class, array_class);
64    return -1;  // Failure
65  }
66}
67
68}  // namespace art
69