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 #ifndef ART_RUNTIME_MIRROR_CLASS_INL_H_
18 #define ART_RUNTIME_MIRROR_CLASS_INL_H_
19
20 #include "class.h"
21
22 #include "art_field.h"
23 #include "art_method.h"
24 #include "base/array_slice.h"
25 #include "base/length_prefixed_array.h"
26 #include "base/utils.h"
27 #include "class_linker.h"
28 #include "class_loader.h"
29 #include "common_throws.h"
30 #include "dex/dex_file-inl.h"
31 #include "dex/invoke_type.h"
32 #include "dex_cache.h"
33 #include "gc/heap-inl.h"
34 #include "iftable.h"
35 #include "subtype_check.h"
36 #include "object-inl.h"
37 #include "object_array.h"
38 #include "read_barrier-inl.h"
39 #include "reference-inl.h"
40 #include "runtime.h"
41 #include "string.h"
42
43 namespace art {
44 namespace mirror {
45
46 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
GetObjectSize()47 inline uint32_t Class::GetObjectSize() {
48 // Note: Extra parentheses to avoid the comma being interpreted as macro parameter separator.
49 DCHECK((!IsVariableSize<kVerifyFlags, kReadBarrierOption>())) << "class=" << PrettyTypeOf();
50 return GetField32(ObjectSizeOffset());
51 }
52
53 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
GetObjectSizeAllocFastPath()54 inline uint32_t Class::GetObjectSizeAllocFastPath() {
55 // Note: Extra parentheses to avoid the comma being interpreted as macro parameter separator.
56 DCHECK((!IsVariableSize<kVerifyFlags, kReadBarrierOption>())) << "class=" << PrettyTypeOf();
57 return GetField32(ObjectSizeAllocFastPathOffset());
58 }
59
60 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
GetSuperClass()61 inline Class* Class::GetSuperClass() {
62 // Can only get super class for loaded classes (hack for when runtime is
63 // initializing)
64 DCHECK(IsLoaded<kVerifyFlags>() ||
65 IsErroneous<kVerifyFlags>() ||
66 !Runtime::Current()->IsStarted()) << IsLoaded();
67 return GetFieldObject<Class, kVerifyFlags, kReadBarrierOption>(
68 OFFSET_OF_OBJECT_MEMBER(Class, super_class_));
69 }
70
SetSuperClass(ObjPtr<Class> new_super_class)71 inline void Class::SetSuperClass(ObjPtr<Class> new_super_class) {
72 // Super class is assigned once, except during class linker initialization.
73 if (kIsDebugBuild) {
74 ObjPtr<Class> old_super_class =
75 GetFieldObject<Class>(OFFSET_OF_OBJECT_MEMBER(Class, super_class_));
76 DCHECK(old_super_class == nullptr || old_super_class == new_super_class);
77 }
78 DCHECK(new_super_class != nullptr);
79 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, super_class_), new_super_class);
80 }
81
82 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
GetClassLoader()83 inline ClassLoader* Class::GetClassLoader() {
84 return GetFieldObject<ClassLoader, kVerifyFlags, kReadBarrierOption>(
85 OFFSET_OF_OBJECT_MEMBER(Class, class_loader_));
86 }
87
88 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
GetExtData()89 inline ClassExt* Class::GetExtData() {
90 return GetFieldObject<ClassExt, kVerifyFlags, kReadBarrierOption>(
91 OFFSET_OF_OBJECT_MEMBER(Class, ext_data_));
92 }
93
94 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
GetDexCache()95 inline DexCache* Class::GetDexCache() {
96 return GetFieldObject<DexCache, kVerifyFlags, kReadBarrierOption>(
97 OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_));
98 }
99
GetCopiedMethodsStartOffset()100 inline uint32_t Class::GetCopiedMethodsStartOffset() {
101 // Object::GetFieldShort returns an int16_t value, but
102 // Class::copied_methods_offset_ is an uint16_t value; cast the
103 // latter to uint16_t before returning it as an uint32_t value, so
104 // that uint16_t values between 2^15 and 2^16-1 are correctly
105 // handled.
106 return static_cast<uint16_t>(
107 GetFieldShort(OFFSET_OF_OBJECT_MEMBER(Class, copied_methods_offset_)));
108 }
109
GetDirectMethodsStartOffset()110 inline uint32_t Class::GetDirectMethodsStartOffset() {
111 return 0;
112 }
113
GetVirtualMethodsStartOffset()114 inline uint32_t Class::GetVirtualMethodsStartOffset() {
115 // Object::GetFieldShort returns an int16_t value, but
116 // Class::virtual_method_offset_ is an uint16_t value; cast the
117 // latter to uint16_t before returning it as an uint32_t value, so
118 // that uint16_t values between 2^15 and 2^16-1 are correctly
119 // handled.
120 return static_cast<uint16_t>(
121 GetFieldShort(OFFSET_OF_OBJECT_MEMBER(Class, virtual_methods_offset_)));
122 }
123
124 template<VerifyObjectFlags kVerifyFlags>
GetDirectMethodsSlice(PointerSize pointer_size)125 inline ArraySlice<ArtMethod> Class::GetDirectMethodsSlice(PointerSize pointer_size) {
126 DCHECK(IsLoaded() || IsErroneous());
127 return GetDirectMethodsSliceUnchecked(pointer_size);
128 }
129
GetDirectMethodsSliceUnchecked(PointerSize pointer_size)130 inline ArraySlice<ArtMethod> Class::GetDirectMethodsSliceUnchecked(PointerSize pointer_size) {
131 return GetMethodsSliceRangeUnchecked(GetMethodsPtr(),
132 pointer_size,
133 GetDirectMethodsStartOffset(),
134 GetVirtualMethodsStartOffset());
135 }
136
137 template<VerifyObjectFlags kVerifyFlags>
GetDeclaredMethodsSlice(PointerSize pointer_size)138 inline ArraySlice<ArtMethod> Class::GetDeclaredMethodsSlice(PointerSize pointer_size) {
139 DCHECK(IsLoaded() || IsErroneous());
140 return GetDeclaredMethodsSliceUnchecked(pointer_size);
141 }
142
GetDeclaredMethodsSliceUnchecked(PointerSize pointer_size)143 inline ArraySlice<ArtMethod> Class::GetDeclaredMethodsSliceUnchecked(PointerSize pointer_size) {
144 return GetMethodsSliceRangeUnchecked(GetMethodsPtr(),
145 pointer_size,
146 GetDirectMethodsStartOffset(),
147 GetCopiedMethodsStartOffset());
148 }
149 template<VerifyObjectFlags kVerifyFlags>
GetDeclaredVirtualMethodsSlice(PointerSize pointer_size)150 inline ArraySlice<ArtMethod> Class::GetDeclaredVirtualMethodsSlice(PointerSize pointer_size) {
151 DCHECK(IsLoaded() || IsErroneous());
152 return GetDeclaredVirtualMethodsSliceUnchecked(pointer_size);
153 }
154
GetDeclaredVirtualMethodsSliceUnchecked(PointerSize pointer_size)155 inline ArraySlice<ArtMethod> Class::GetDeclaredVirtualMethodsSliceUnchecked(
156 PointerSize pointer_size) {
157 return GetMethodsSliceRangeUnchecked(GetMethodsPtr(),
158 pointer_size,
159 GetVirtualMethodsStartOffset(),
160 GetCopiedMethodsStartOffset());
161 }
162
163 template<VerifyObjectFlags kVerifyFlags>
GetVirtualMethodsSlice(PointerSize pointer_size)164 inline ArraySlice<ArtMethod> Class::GetVirtualMethodsSlice(PointerSize pointer_size) {
165 DCHECK(IsLoaded() || IsErroneous());
166 return GetVirtualMethodsSliceUnchecked(pointer_size);
167 }
168
GetVirtualMethodsSliceUnchecked(PointerSize pointer_size)169 inline ArraySlice<ArtMethod> Class::GetVirtualMethodsSliceUnchecked(PointerSize pointer_size) {
170 LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
171 return GetMethodsSliceRangeUnchecked(methods,
172 pointer_size,
173 GetVirtualMethodsStartOffset(),
174 NumMethods(methods));
175 }
176
177 template<VerifyObjectFlags kVerifyFlags>
GetCopiedMethodsSlice(PointerSize pointer_size)178 inline ArraySlice<ArtMethod> Class::GetCopiedMethodsSlice(PointerSize pointer_size) {
179 DCHECK(IsLoaded() || IsErroneous());
180 return GetCopiedMethodsSliceUnchecked(pointer_size);
181 }
182
GetCopiedMethodsSliceUnchecked(PointerSize pointer_size)183 inline ArraySlice<ArtMethod> Class::GetCopiedMethodsSliceUnchecked(PointerSize pointer_size) {
184 LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
185 return GetMethodsSliceRangeUnchecked(methods,
186 pointer_size,
187 GetCopiedMethodsStartOffset(),
188 NumMethods(methods));
189 }
190
GetMethodsPtr()191 inline LengthPrefixedArray<ArtMethod>* Class::GetMethodsPtr() {
192 return reinterpret_cast<LengthPrefixedArray<ArtMethod>*>(
193 static_cast<uintptr_t>(GetField64(OFFSET_OF_OBJECT_MEMBER(Class, methods_))));
194 }
195
196 template<VerifyObjectFlags kVerifyFlags>
GetMethodsSlice(PointerSize pointer_size)197 inline ArraySlice<ArtMethod> Class::GetMethodsSlice(PointerSize pointer_size) {
198 DCHECK(IsLoaded() || IsErroneous());
199 LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
200 return GetMethodsSliceRangeUnchecked(methods, pointer_size, 0, NumMethods(methods));
201 }
202
GetMethodsSliceRangeUnchecked(LengthPrefixedArray<ArtMethod> * methods,PointerSize pointer_size,uint32_t start_offset,uint32_t end_offset)203 inline ArraySlice<ArtMethod> Class::GetMethodsSliceRangeUnchecked(
204 LengthPrefixedArray<ArtMethod>* methods,
205 PointerSize pointer_size,
206 uint32_t start_offset,
207 uint32_t end_offset) {
208 DCHECK_LE(start_offset, end_offset);
209 DCHECK_LE(end_offset, NumMethods(methods));
210 uint32_t size = end_offset - start_offset;
211 if (size == 0u) {
212 return ArraySlice<ArtMethod>();
213 }
214 DCHECK(methods != nullptr);
215 DCHECK_LE(end_offset, methods->size());
216 size_t method_size = ArtMethod::Size(pointer_size);
217 size_t method_alignment = ArtMethod::Alignment(pointer_size);
218 ArraySlice<ArtMethod> slice(&methods->At(0u, method_size, method_alignment),
219 methods->size(),
220 method_size);
221 return slice.SubArray(start_offset, size);
222 }
223
NumMethods()224 inline uint32_t Class::NumMethods() {
225 return NumMethods(GetMethodsPtr());
226 }
227
NumMethods(LengthPrefixedArray<ArtMethod> * methods)228 inline uint32_t Class::NumMethods(LengthPrefixedArray<ArtMethod>* methods) {
229 return (methods == nullptr) ? 0 : methods->size();
230 }
231
GetDirectMethodUnchecked(size_t i,PointerSize pointer_size)232 inline ArtMethod* Class::GetDirectMethodUnchecked(size_t i, PointerSize pointer_size) {
233 CheckPointerSize(pointer_size);
234 return &GetDirectMethodsSliceUnchecked(pointer_size)[i];
235 }
236
GetDirectMethod(size_t i,PointerSize pointer_size)237 inline ArtMethod* Class::GetDirectMethod(size_t i, PointerSize pointer_size) {
238 CheckPointerSize(pointer_size);
239 return &GetDirectMethodsSlice(pointer_size)[i];
240 }
241
SetMethodsPtr(LengthPrefixedArray<ArtMethod> * new_methods,uint32_t num_direct,uint32_t num_virtual)242 inline void Class::SetMethodsPtr(LengthPrefixedArray<ArtMethod>* new_methods,
243 uint32_t num_direct,
244 uint32_t num_virtual) {
245 DCHECK(GetMethodsPtr() == nullptr);
246 SetMethodsPtrUnchecked(new_methods, num_direct, num_virtual);
247 }
248
249
SetMethodsPtrUnchecked(LengthPrefixedArray<ArtMethod> * new_methods,uint32_t num_direct,uint32_t num_virtual)250 inline void Class::SetMethodsPtrUnchecked(LengthPrefixedArray<ArtMethod>* new_methods,
251 uint32_t num_direct,
252 uint32_t num_virtual) {
253 DCHECK_LE(num_direct + num_virtual, (new_methods == nullptr) ? 0 : new_methods->size());
254 SetMethodsPtrInternal(new_methods);
255 SetFieldShort<false>(OFFSET_OF_OBJECT_MEMBER(Class, copied_methods_offset_),
256 dchecked_integral_cast<uint16_t>(num_direct + num_virtual));
257 SetFieldShort<false>(OFFSET_OF_OBJECT_MEMBER(Class, virtual_methods_offset_),
258 dchecked_integral_cast<uint16_t>(num_direct));
259 }
260
SetMethodsPtrInternal(LengthPrefixedArray<ArtMethod> * new_methods)261 inline void Class::SetMethodsPtrInternal(LengthPrefixedArray<ArtMethod>* new_methods) {
262 SetField64<false>(OFFSET_OF_OBJECT_MEMBER(Class, methods_),
263 static_cast<uint64_t>(reinterpret_cast<uintptr_t>(new_methods)));
264 }
265
266 template<VerifyObjectFlags kVerifyFlags>
GetVirtualMethod(size_t i,PointerSize pointer_size)267 inline ArtMethod* Class::GetVirtualMethod(size_t i, PointerSize pointer_size) {
268 CheckPointerSize(pointer_size);
269 DCHECK(IsResolved<kVerifyFlags>() || IsErroneous<kVerifyFlags>())
270 << Class::PrettyClass() << " status=" << GetStatus();
271 return GetVirtualMethodUnchecked(i, pointer_size);
272 }
273
GetVirtualMethodDuringLinking(size_t i,PointerSize pointer_size)274 inline ArtMethod* Class::GetVirtualMethodDuringLinking(size_t i, PointerSize pointer_size) {
275 CheckPointerSize(pointer_size);
276 DCHECK(IsLoaded() || IsErroneous());
277 return GetVirtualMethodUnchecked(i, pointer_size);
278 }
279
GetVirtualMethodUnchecked(size_t i,PointerSize pointer_size)280 inline ArtMethod* Class::GetVirtualMethodUnchecked(size_t i, PointerSize pointer_size) {
281 CheckPointerSize(pointer_size);
282 return &GetVirtualMethodsSliceUnchecked(pointer_size)[i];
283 }
284
285 template<VerifyObjectFlags kVerifyFlags,
286 ReadBarrierOption kReadBarrierOption>
GetVTable()287 inline PointerArray* Class::GetVTable() {
288 DCHECK(IsLoaded<kVerifyFlags>() || IsErroneous<kVerifyFlags>());
289 return GetFieldObject<PointerArray, kVerifyFlags, kReadBarrierOption>(
290 OFFSET_OF_OBJECT_MEMBER(Class, vtable_));
291 }
292
GetVTableDuringLinking()293 inline PointerArray* Class::GetVTableDuringLinking() {
294 DCHECK(IsLoaded() || IsErroneous());
295 return GetFieldObject<PointerArray>(OFFSET_OF_OBJECT_MEMBER(Class, vtable_));
296 }
297
SetVTable(PointerArray * new_vtable)298 inline void Class::SetVTable(PointerArray* new_vtable) {
299 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, vtable_), new_vtable);
300 }
301
HasVTable()302 inline bool Class::HasVTable() {
303 return GetVTable() != nullptr || ShouldHaveEmbeddedVTable();
304 }
305
306 template<VerifyObjectFlags kVerifyFlags,
307 ReadBarrierOption kReadBarrierOption>
GetVTableLength()308 inline int32_t Class::GetVTableLength() {
309 if (ShouldHaveEmbeddedVTable<kVerifyFlags, kReadBarrierOption>()) {
310 return GetEmbeddedVTableLength();
311 }
312 return GetVTable<kVerifyFlags, kReadBarrierOption>() != nullptr ?
313 GetVTable<kVerifyFlags, kReadBarrierOption>()->GetLength() : 0;
314 }
315
316 template<VerifyObjectFlags kVerifyFlags,
317 ReadBarrierOption kReadBarrierOption>
GetVTableEntry(uint32_t i,PointerSize pointer_size)318 inline ArtMethod* Class::GetVTableEntry(uint32_t i, PointerSize pointer_size) {
319 if (ShouldHaveEmbeddedVTable<kVerifyFlags, kReadBarrierOption>()) {
320 return GetEmbeddedVTableEntry(i, pointer_size);
321 }
322 auto* vtable = GetVTable<kVerifyFlags, kReadBarrierOption>();
323 DCHECK(vtable != nullptr);
324 return vtable->template GetElementPtrSize<ArtMethod*, kVerifyFlags, kReadBarrierOption>(i, pointer_size);
325 }
326
GetEmbeddedVTableLength()327 inline int32_t Class::GetEmbeddedVTableLength() {
328 return GetField32(MemberOffset(EmbeddedVTableLengthOffset()));
329 }
330
SetEmbeddedVTableLength(int32_t len)331 inline void Class::SetEmbeddedVTableLength(int32_t len) {
332 SetField32<false>(MemberOffset(EmbeddedVTableLengthOffset()), len);
333 }
334
GetImt(PointerSize pointer_size)335 inline ImTable* Class::GetImt(PointerSize pointer_size) {
336 return GetFieldPtrWithSize<ImTable*>(MemberOffset(ImtPtrOffset(pointer_size)), pointer_size);
337 }
338
SetImt(ImTable * imt,PointerSize pointer_size)339 inline void Class::SetImt(ImTable* imt, PointerSize pointer_size) {
340 return SetFieldPtrWithSize<false>(MemberOffset(ImtPtrOffset(pointer_size)), imt, pointer_size);
341 }
342
EmbeddedVTableEntryOffset(uint32_t i,PointerSize pointer_size)343 inline MemberOffset Class::EmbeddedVTableEntryOffset(uint32_t i, PointerSize pointer_size) {
344 return MemberOffset(
345 EmbeddedVTableOffset(pointer_size).Uint32Value() + i * VTableEntrySize(pointer_size));
346 }
347
GetEmbeddedVTableEntry(uint32_t i,PointerSize pointer_size)348 inline ArtMethod* Class::GetEmbeddedVTableEntry(uint32_t i, PointerSize pointer_size) {
349 return GetFieldPtrWithSize<ArtMethod*>(EmbeddedVTableEntryOffset(i, pointer_size), pointer_size);
350 }
351
SetEmbeddedVTableEntryUnchecked(uint32_t i,ArtMethod * method,PointerSize pointer_size)352 inline void Class::SetEmbeddedVTableEntryUnchecked(
353 uint32_t i, ArtMethod* method, PointerSize pointer_size) {
354 SetFieldPtrWithSize<false>(EmbeddedVTableEntryOffset(i, pointer_size), method, pointer_size);
355 }
356
SetEmbeddedVTableEntry(uint32_t i,ArtMethod * method,PointerSize pointer_size)357 inline void Class::SetEmbeddedVTableEntry(uint32_t i, ArtMethod* method, PointerSize pointer_size) {
358 auto* vtable = GetVTableDuringLinking();
359 CHECK_EQ(method, vtable->GetElementPtrSize<ArtMethod*>(i, pointer_size));
360 SetEmbeddedVTableEntryUnchecked(i, method, pointer_size);
361 }
362
Implements(ObjPtr<Class> klass)363 inline bool Class::Implements(ObjPtr<Class> klass) {
364 DCHECK(klass != nullptr);
365 DCHECK(klass->IsInterface()) << PrettyClass();
366 // All interfaces implemented directly and by our superclass, and
367 // recursively all super-interfaces of those interfaces, are listed
368 // in iftable_, so we can just do a linear scan through that.
369 int32_t iftable_count = GetIfTableCount();
370 ObjPtr<IfTable> iftable = GetIfTable();
371 for (int32_t i = 0; i < iftable_count; i++) {
372 if (iftable->GetInterface(i) == klass) {
373 return true;
374 }
375 }
376 return false;
377 }
378
379 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
IsVariableSize()380 inline bool Class::IsVariableSize() {
381 // Classes, arrays, and strings vary in size, and so the object_size_ field cannot
382 // be used to Get their instance size
383 return IsClassClass<kVerifyFlags, kReadBarrierOption>() ||
384 IsArrayClass<kVerifyFlags, kReadBarrierOption>() ||
385 IsStringClass();
386 }
387
SetObjectSize(uint32_t new_object_size)388 inline void Class::SetObjectSize(uint32_t new_object_size) {
389 DCHECK(!IsVariableSize());
390 // Not called within a transaction.
391 return SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, object_size_), new_object_size);
392 }
393
394 // Determine whether "this" is assignable from "src", where both of these
395 // are array classes.
396 //
397 // Consider an array class, e.g. Y[][], where Y is a subclass of X.
398 // Y[][] = Y[][] --> true (identity)
399 // X[][] = Y[][] --> true (element superclass)
400 // Y = Y[][] --> false
401 // Y[] = Y[][] --> false
402 // Object = Y[][] --> true (everything is an object)
403 // Object[] = Y[][] --> true
404 // Object[][] = Y[][] --> true
405 // Object[][][] = Y[][] --> false (too many []s)
406 // Serializable = Y[][] --> true (all arrays are Serializable)
407 // Serializable[] = Y[][] --> true
408 // Serializable[][] = Y[][] --> false (unless Y is Serializable)
409 //
410 // Don't forget about primitive types.
411 // Object[] = int[] --> false
412 //
IsArrayAssignableFromArray(ObjPtr<Class> src)413 inline bool Class::IsArrayAssignableFromArray(ObjPtr<Class> src) {
414 DCHECK(IsArrayClass()) << PrettyClass();
415 DCHECK(src->IsArrayClass()) << src->PrettyClass();
416 return GetComponentType()->IsAssignableFrom(src->GetComponentType());
417 }
418
IsAssignableFromArray(ObjPtr<Class> src)419 inline bool Class::IsAssignableFromArray(ObjPtr<Class> src) {
420 DCHECK(!IsInterface()) << PrettyClass(); // handled first in IsAssignableFrom
421 DCHECK(src->IsArrayClass()) << src->PrettyClass();
422 if (!IsArrayClass()) {
423 // If "this" is not also an array, it must be Object.
424 // src's super should be java_lang_Object, since it is an array.
425 ObjPtr<Class> java_lang_Object = src->GetSuperClass();
426 DCHECK(java_lang_Object != nullptr) << src->PrettyClass();
427 DCHECK(java_lang_Object->GetSuperClass() == nullptr) << src->PrettyClass();
428 return this == java_lang_Object;
429 }
430 return IsArrayAssignableFromArray(src);
431 }
432
433 template <bool throw_on_failure>
ResolvedFieldAccessTest(ObjPtr<Class> access_to,ArtField * field,ObjPtr<DexCache> dex_cache,uint32_t field_idx)434 inline bool Class::ResolvedFieldAccessTest(ObjPtr<Class> access_to,
435 ArtField* field,
436 ObjPtr<DexCache> dex_cache,
437 uint32_t field_idx) {
438 DCHECK(dex_cache != nullptr);
439 if (UNLIKELY(!this->CanAccess(access_to))) {
440 // The referrer class can't access the field's declaring class but may still be able
441 // to access the field if the FieldId specifies an accessible subclass of the declaring
442 // class rather than the declaring class itself.
443 dex::TypeIndex class_idx = dex_cache->GetDexFile()->GetFieldId(field_idx).class_idx_;
444 // The referenced class has already been resolved with the field, but may not be in the dex
445 // cache. Use LookupResolveType here to search the class table if it is not in the dex cache.
446 // should be no thread suspension due to the class being resolved.
447 ObjPtr<Class> dex_access_to = Runtime::Current()->GetClassLinker()->LookupResolvedType(
448 class_idx,
449 dex_cache,
450 access_to->GetClassLoader());
451 DCHECK(dex_access_to != nullptr);
452 if (UNLIKELY(!this->CanAccess(dex_access_to))) {
453 if (throw_on_failure) {
454 ThrowIllegalAccessErrorClass(this, dex_access_to);
455 }
456 return false;
457 }
458 }
459 if (LIKELY(this->CanAccessMember(access_to, field->GetAccessFlags()))) {
460 return true;
461 }
462 if (throw_on_failure) {
463 ThrowIllegalAccessErrorField(this, field);
464 }
465 return false;
466 }
467
468 template <bool throw_on_failure>
ResolvedMethodAccessTest(ObjPtr<Class> access_to,ArtMethod * method,ObjPtr<DexCache> dex_cache,uint32_t method_idx,InvokeType throw_invoke_type)469 inline bool Class::ResolvedMethodAccessTest(ObjPtr<Class> access_to,
470 ArtMethod* method,
471 ObjPtr<DexCache> dex_cache,
472 uint32_t method_idx,
473 InvokeType throw_invoke_type) {
474 DCHECK(throw_on_failure || throw_invoke_type == kStatic);
475 DCHECK(dex_cache != nullptr);
476 if (UNLIKELY(!this->CanAccess(access_to))) {
477 // The referrer class can't access the method's declaring class but may still be able
478 // to access the method if the MethodId specifies an accessible subclass of the declaring
479 // class rather than the declaring class itself.
480 dex::TypeIndex class_idx = dex_cache->GetDexFile()->GetMethodId(method_idx).class_idx_;
481 // The referenced class has already been resolved with the method, but may not be in the dex
482 // cache.
483 ObjPtr<Class> dex_access_to = Runtime::Current()->GetClassLinker()->LookupResolvedType(
484 class_idx,
485 dex_cache,
486 access_to->GetClassLoader());
487 DCHECK(dex_access_to != nullptr);
488 if (UNLIKELY(!this->CanAccess(dex_access_to))) {
489 if (throw_on_failure) {
490 ThrowIllegalAccessErrorClassForMethodDispatch(this,
491 dex_access_to.Ptr(),
492 method,
493 throw_invoke_type);
494 }
495 return false;
496 }
497 }
498 if (LIKELY(this->CanAccessMember(access_to, method->GetAccessFlags()))) {
499 return true;
500 }
501 if (throw_on_failure) {
502 ThrowIllegalAccessErrorMethod(this, method);
503 }
504 return false;
505 }
506
CanAccessResolvedField(ObjPtr<Class> access_to,ArtField * field,ObjPtr<DexCache> dex_cache,uint32_t field_idx)507 inline bool Class::CanAccessResolvedField(ObjPtr<Class> access_to,
508 ArtField* field,
509 ObjPtr<DexCache> dex_cache,
510 uint32_t field_idx) {
511 return ResolvedFieldAccessTest<false>(access_to, field, dex_cache, field_idx);
512 }
513
CheckResolvedFieldAccess(ObjPtr<Class> access_to,ArtField * field,ObjPtr<DexCache> dex_cache,uint32_t field_idx)514 inline bool Class::CheckResolvedFieldAccess(ObjPtr<Class> access_to,
515 ArtField* field,
516 ObjPtr<DexCache> dex_cache,
517 uint32_t field_idx) {
518 return ResolvedFieldAccessTest<true>(access_to, field, dex_cache, field_idx);
519 }
520
CanAccessResolvedMethod(ObjPtr<Class> access_to,ArtMethod * method,ObjPtr<DexCache> dex_cache,uint32_t method_idx)521 inline bool Class::CanAccessResolvedMethod(ObjPtr<Class> access_to,
522 ArtMethod* method,
523 ObjPtr<DexCache> dex_cache,
524 uint32_t method_idx) {
525 return ResolvedMethodAccessTest<false>(access_to, method, dex_cache, method_idx, kStatic);
526 }
527
CheckResolvedMethodAccess(ObjPtr<Class> access_to,ArtMethod * method,ObjPtr<DexCache> dex_cache,uint32_t method_idx,InvokeType throw_invoke_type)528 inline bool Class::CheckResolvedMethodAccess(ObjPtr<Class> access_to,
529 ArtMethod* method,
530 ObjPtr<DexCache> dex_cache,
531 uint32_t method_idx,
532 InvokeType throw_invoke_type) {
533 return ResolvedMethodAccessTest<true>(
534 access_to, method, dex_cache, method_idx, throw_invoke_type);
535 }
536
IsSubClass(ObjPtr<Class> klass)537 inline bool Class::IsSubClass(ObjPtr<Class> klass) {
538 // Since the SubtypeCheck::IsSubtypeOf needs to lookup the Depth,
539 // it is always O(Depth) in terms of speed to do the check.
540 //
541 // So always do the "slow" linear scan in normal release builds.
542 //
543 // Future note: If we could have the depth in O(1) we could use the 'fast'
544 // method instead as it avoids a loop and a read barrier.
545 bool result = false;
546 DCHECK(!IsInterface()) << PrettyClass();
547 DCHECK(!IsArrayClass()) << PrettyClass();
548 ObjPtr<Class> current = this;
549 do {
550 if (current == klass) {
551 result = true;
552 break;
553 }
554 current = current->GetSuperClass();
555 } while (current != nullptr);
556
557 if (kIsDebugBuild && kBitstringSubtypeCheckEnabled) {
558 ObjPtr<mirror::Class> dis(this);
559
560 SubtypeCheckInfo::Result sc_result = SubtypeCheck<ObjPtr<Class>>::IsSubtypeOf(dis, klass);
561 if (sc_result != SubtypeCheckInfo::kUnknownSubtypeOf) {
562 // Note: The "kUnknownSubTypeOf" can be avoided if and only if:
563 // SubtypeCheck::EnsureInitialized(source)
564 // happens-before source.IsSubClass(target)
565 // SubtypeCheck::EnsureAssigned(target).GetState() == Assigned
566 // happens-before source.IsSubClass(target)
567 //
568 // When code generated by optimizing compiler executes this operation, both
569 // happens-before are guaranteed, so there is no fallback code there.
570 SubtypeCheckInfo::Result expected_result =
571 result ? SubtypeCheckInfo::kSubtypeOf : SubtypeCheckInfo::kNotSubtypeOf;
572 DCHECK_EQ(expected_result, sc_result)
573 << "source: " << PrettyClass() << "target: " << klass->PrettyClass();
574 }
575 }
576
577 return result;
578 }
579
FindVirtualMethodForInterface(ArtMethod * method,PointerSize pointer_size)580 inline ArtMethod* Class::FindVirtualMethodForInterface(ArtMethod* method,
581 PointerSize pointer_size) {
582 ObjPtr<Class> declaring_class = method->GetDeclaringClass();
583 DCHECK(declaring_class != nullptr) << PrettyClass();
584 if (UNLIKELY(!declaring_class->IsInterface())) {
585 DCHECK(declaring_class->IsObjectClass()) << method->PrettyMethod();
586 DCHECK(method->IsPublic() && !method->IsStatic());
587 return FindVirtualMethodForVirtual(method, pointer_size);
588 }
589 DCHECK(!method->IsCopied());
590 // TODO cache to improve lookup speed
591 const int32_t iftable_count = GetIfTableCount();
592 ObjPtr<IfTable> iftable = GetIfTable();
593 for (int32_t i = 0; i < iftable_count; i++) {
594 if (iftable->GetInterface(i) == declaring_class) {
595 return iftable->GetMethodArray(i)->GetElementPtrSize<ArtMethod*>(
596 method->GetMethodIndex(), pointer_size);
597 }
598 }
599 return nullptr;
600 }
601
FindVirtualMethodForVirtual(ArtMethod * method,PointerSize pointer_size)602 inline ArtMethod* Class::FindVirtualMethodForVirtual(ArtMethod* method, PointerSize pointer_size) {
603 // Only miranda or default methods may come from interfaces and be used as a virtual.
604 DCHECK(!method->GetDeclaringClass()->IsInterface() || method->IsDefault() || method->IsMiranda());
605 // The argument method may from a super class.
606 // Use the index to a potentially overridden one for this instance's class.
607 return GetVTableEntry(method->GetMethodIndex(), pointer_size);
608 }
609
FindVirtualMethodForSuper(ArtMethod * method,PointerSize pointer_size)610 inline ArtMethod* Class::FindVirtualMethodForSuper(ArtMethod* method, PointerSize pointer_size) {
611 DCHECK(!method->GetDeclaringClass()->IsInterface());
612 return GetSuperClass()->GetVTableEntry(method->GetMethodIndex(), pointer_size);
613 }
614
FindVirtualMethodForVirtualOrInterface(ArtMethod * method,PointerSize pointer_size)615 inline ArtMethod* Class::FindVirtualMethodForVirtualOrInterface(ArtMethod* method,
616 PointerSize pointer_size) {
617 if (method->IsDirect()) {
618 return method;
619 }
620 if (method->GetDeclaringClass()->IsInterface() && !method->IsCopied()) {
621 return FindVirtualMethodForInterface(method, pointer_size);
622 }
623 return FindVirtualMethodForVirtual(method, pointer_size);
624 }
625
626 template<VerifyObjectFlags kVerifyFlags,
627 ReadBarrierOption kReadBarrierOption>
GetIfTable()628 inline IfTable* Class::GetIfTable() {
629 ObjPtr<IfTable> ret = GetFieldObject<IfTable, kVerifyFlags, kReadBarrierOption>(IfTableOffset());
630 DCHECK(ret != nullptr) << PrettyClass(this);
631 return ret.Ptr();
632 }
633
634 template<VerifyObjectFlags kVerifyFlags,
635 ReadBarrierOption kReadBarrierOption>
GetIfTableCount()636 inline int32_t Class::GetIfTableCount() {
637 return GetIfTable<kVerifyFlags, kReadBarrierOption>()->Count();
638 }
639
SetIfTable(ObjPtr<IfTable> new_iftable)640 inline void Class::SetIfTable(ObjPtr<IfTable> new_iftable) {
641 DCHECK(new_iftable != nullptr) << PrettyClass(this);
642 SetFieldObject<false>(IfTableOffset(), new_iftable);
643 }
644
GetIFieldsPtr()645 inline LengthPrefixedArray<ArtField>* Class::GetIFieldsPtr() {
646 DCHECK(IsLoaded() || IsErroneous()) << GetStatus();
647 return GetFieldPtr<LengthPrefixedArray<ArtField>*>(OFFSET_OF_OBJECT_MEMBER(Class, ifields_));
648 }
649
650 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
GetFirstReferenceInstanceFieldOffset()651 inline MemberOffset Class::GetFirstReferenceInstanceFieldOffset() {
652 ObjPtr<Class> super_class = GetSuperClass<kVerifyFlags, kReadBarrierOption>();
653 return (super_class != nullptr)
654 ? MemberOffset(RoundUp(super_class->GetObjectSize<kVerifyFlags, kReadBarrierOption>(),
655 kHeapReferenceSize))
656 : ClassOffset();
657 }
658
659 template <VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
GetFirstReferenceStaticFieldOffset(PointerSize pointer_size)660 inline MemberOffset Class::GetFirstReferenceStaticFieldOffset(PointerSize pointer_size) {
661 DCHECK(IsResolved());
662 uint32_t base = sizeof(Class); // Static fields come after the class.
663 if (ShouldHaveEmbeddedVTable<kVerifyFlags, kReadBarrierOption>()) {
664 // Static fields come after the embedded tables.
665 base = Class::ComputeClassSize(
666 true, GetEmbeddedVTableLength(), 0, 0, 0, 0, 0, pointer_size);
667 }
668 return MemberOffset(base);
669 }
670
GetFirstReferenceStaticFieldOffsetDuringLinking(PointerSize pointer_size)671 inline MemberOffset Class::GetFirstReferenceStaticFieldOffsetDuringLinking(
672 PointerSize pointer_size) {
673 DCHECK(IsLoaded());
674 uint32_t base = sizeof(Class); // Static fields come after the class.
675 if (ShouldHaveEmbeddedVTable()) {
676 // Static fields come after the embedded tables.
677 base = Class::ComputeClassSize(true, GetVTableDuringLinking()->GetLength(),
678 0, 0, 0, 0, 0, pointer_size);
679 }
680 return MemberOffset(base);
681 }
682
SetIFieldsPtr(LengthPrefixedArray<ArtField> * new_ifields)683 inline void Class::SetIFieldsPtr(LengthPrefixedArray<ArtField>* new_ifields) {
684 DCHECK(GetIFieldsPtrUnchecked() == nullptr);
685 return SetFieldPtr<false>(OFFSET_OF_OBJECT_MEMBER(Class, ifields_), new_ifields);
686 }
687
SetIFieldsPtrUnchecked(LengthPrefixedArray<ArtField> * new_ifields)688 inline void Class::SetIFieldsPtrUnchecked(LengthPrefixedArray<ArtField>* new_ifields) {
689 SetFieldPtr<false, true, kVerifyNone>(OFFSET_OF_OBJECT_MEMBER(Class, ifields_), new_ifields);
690 }
691
GetSFieldsPtrUnchecked()692 inline LengthPrefixedArray<ArtField>* Class::GetSFieldsPtrUnchecked() {
693 return GetFieldPtr<LengthPrefixedArray<ArtField>*>(OFFSET_OF_OBJECT_MEMBER(Class, sfields_));
694 }
695
GetIFieldsPtrUnchecked()696 inline LengthPrefixedArray<ArtField>* Class::GetIFieldsPtrUnchecked() {
697 return GetFieldPtr<LengthPrefixedArray<ArtField>*>(OFFSET_OF_OBJECT_MEMBER(Class, ifields_));
698 }
699
GetSFieldsPtr()700 inline LengthPrefixedArray<ArtField>* Class::GetSFieldsPtr() {
701 DCHECK(IsLoaded() || IsErroneous()) << GetStatus();
702 return GetSFieldsPtrUnchecked();
703 }
704
SetSFieldsPtr(LengthPrefixedArray<ArtField> * new_sfields)705 inline void Class::SetSFieldsPtr(LengthPrefixedArray<ArtField>* new_sfields) {
706 DCHECK((IsRetired() && new_sfields == nullptr) ||
707 GetFieldPtr<ArtField*>(OFFSET_OF_OBJECT_MEMBER(Class, sfields_)) == nullptr);
708 SetFieldPtr<false>(OFFSET_OF_OBJECT_MEMBER(Class, sfields_), new_sfields);
709 }
710
SetSFieldsPtrUnchecked(LengthPrefixedArray<ArtField> * new_sfields)711 inline void Class::SetSFieldsPtrUnchecked(LengthPrefixedArray<ArtField>* new_sfields) {
712 SetFieldPtr<false, true, kVerifyNone>(OFFSET_OF_OBJECT_MEMBER(Class, sfields_), new_sfields);
713 }
714
GetStaticField(uint32_t i)715 inline ArtField* Class::GetStaticField(uint32_t i) {
716 return &GetSFieldsPtr()->At(i);
717 }
718
GetInstanceField(uint32_t i)719 inline ArtField* Class::GetInstanceField(uint32_t i) {
720 return &GetIFieldsPtr()->At(i);
721 }
722
723 template<VerifyObjectFlags kVerifyFlags>
GetReferenceInstanceOffsets()724 inline uint32_t Class::GetReferenceInstanceOffsets() {
725 DCHECK(IsResolved<kVerifyFlags>() || IsErroneous<kVerifyFlags>());
726 return GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_));
727 }
728
SetClinitThreadId(pid_t new_clinit_thread_id)729 inline void Class::SetClinitThreadId(pid_t new_clinit_thread_id) {
730 SetField32Transaction(OFFSET_OF_OBJECT_MEMBER(Class, clinit_thread_id_), new_clinit_thread_id);
731 }
732
GetName()733 inline String* Class::GetName() {
734 return GetFieldObject<String>(OFFSET_OF_OBJECT_MEMBER(Class, name_));
735 }
736
SetName(ObjPtr<String> name)737 inline void Class::SetName(ObjPtr<String> name) {
738 SetFieldObjectTransaction(OFFSET_OF_OBJECT_MEMBER(Class, name_), name);
739 }
740
741 template<VerifyObjectFlags kVerifyFlags>
GetPrimitiveType()742 inline Primitive::Type Class::GetPrimitiveType() {
743 static_assert(sizeof(Primitive::Type) == sizeof(int32_t),
744 "art::Primitive::Type and int32_t have different sizes.");
745 int32_t v32 = GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, primitive_type_));
746 Primitive::Type type = static_cast<Primitive::Type>(v32 & kPrimitiveTypeMask);
747 DCHECK_EQ(static_cast<size_t>(v32 >> kPrimitiveTypeSizeShiftShift),
748 Primitive::ComponentSizeShift(type));
749 return type;
750 }
751
752 template<VerifyObjectFlags kVerifyFlags>
GetPrimitiveTypeSizeShift()753 inline size_t Class::GetPrimitiveTypeSizeShift() {
754 static_assert(sizeof(Primitive::Type) == sizeof(int32_t),
755 "art::Primitive::Type and int32_t have different sizes.");
756 int32_t v32 = GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, primitive_type_));
757 size_t size_shift = static_cast<Primitive::Type>(v32 >> kPrimitiveTypeSizeShiftShift);
758 DCHECK_EQ(size_shift,
759 Primitive::ComponentSizeShift(static_cast<Primitive::Type>(v32 & kPrimitiveTypeMask)));
760 return size_shift;
761 }
762
CheckObjectAlloc()763 inline void Class::CheckObjectAlloc() {
764 DCHECK(!IsArrayClass())
765 << PrettyClass()
766 << "A array shouldn't be allocated through this "
767 << "as it requires a pre-fence visitor that sets the class size.";
768 DCHECK(!IsClassClass())
769 << PrettyClass()
770 << "A class object shouldn't be allocated through this "
771 << "as it requires a pre-fence visitor that sets the class size.";
772 DCHECK(!IsStringClass())
773 << PrettyClass()
774 << "A string shouldn't be allocated through this "
775 << "as it requires a pre-fence visitor that sets the class size.";
776 DCHECK(IsInstantiable()) << PrettyClass();
777 // TODO: decide whether we want this check. It currently fails during bootstrap.
778 // DCHECK(!Runtime::Current()->IsStarted() || IsInitializing()) << PrettyClass();
779 DCHECK_GE(this->object_size_, sizeof(Object));
780 }
781
782 template<bool kIsInstrumented, bool kCheckAddFinalizer>
Alloc(Thread * self,gc::AllocatorType allocator_type)783 inline ObjPtr<Object> Class::Alloc(Thread* self, gc::AllocatorType allocator_type) {
784 CheckObjectAlloc();
785 gc::Heap* heap = Runtime::Current()->GetHeap();
786 const bool add_finalizer = kCheckAddFinalizer && IsFinalizable();
787 if (!kCheckAddFinalizer) {
788 DCHECK(!IsFinalizable());
789 }
790 // Note that the this pointer may be invalidated after the allocation.
791 ObjPtr<Object> obj =
792 heap->AllocObjectWithAllocator<kIsInstrumented, false>(self,
793 this,
794 this->object_size_,
795 allocator_type,
796 VoidFunctor());
797 if (add_finalizer && LIKELY(obj != nullptr)) {
798 heap->AddFinalizerReference(self, &obj);
799 if (UNLIKELY(self->IsExceptionPending())) {
800 // Failed to allocate finalizer reference, it means that the whole allocation failed.
801 obj = nullptr;
802 }
803 }
804 return obj.Ptr();
805 }
806
AllocObject(Thread * self)807 inline ObjPtr<Object> Class::AllocObject(Thread* self) {
808 return Alloc<true>(self, Runtime::Current()->GetHeap()->GetCurrentAllocator());
809 }
810
AllocNonMovableObject(Thread * self)811 inline ObjPtr<Object> Class::AllocNonMovableObject(Thread* self) {
812 return Alloc<true>(self, Runtime::Current()->GetHeap()->GetCurrentNonMovingAllocator());
813 }
814
ComputeClassSize(bool has_embedded_vtable,uint32_t num_vtable_entries,uint32_t num_8bit_static_fields,uint32_t num_16bit_static_fields,uint32_t num_32bit_static_fields,uint32_t num_64bit_static_fields,uint32_t num_ref_static_fields,PointerSize pointer_size)815 inline uint32_t Class::ComputeClassSize(bool has_embedded_vtable,
816 uint32_t num_vtable_entries,
817 uint32_t num_8bit_static_fields,
818 uint32_t num_16bit_static_fields,
819 uint32_t num_32bit_static_fields,
820 uint32_t num_64bit_static_fields,
821 uint32_t num_ref_static_fields,
822 PointerSize pointer_size) {
823 // Space used by java.lang.Class and its instance fields.
824 uint32_t size = sizeof(Class);
825 // Space used by embedded tables.
826 if (has_embedded_vtable) {
827 size = RoundUp(size + sizeof(uint32_t), static_cast<size_t>(pointer_size));
828 size += static_cast<size_t>(pointer_size); // size of pointer to IMT
829 size += num_vtable_entries * VTableEntrySize(pointer_size);
830 }
831
832 // Space used by reference statics.
833 size += num_ref_static_fields * kHeapReferenceSize;
834 if (!IsAligned<8>(size) && num_64bit_static_fields > 0) {
835 uint32_t gap = 8 - (size & 0x7);
836 size += gap; // will be padded
837 // Shuffle 4-byte fields forward.
838 while (gap >= sizeof(uint32_t) && num_32bit_static_fields != 0) {
839 --num_32bit_static_fields;
840 gap -= sizeof(uint32_t);
841 }
842 // Shuffle 2-byte fields forward.
843 while (gap >= sizeof(uint16_t) && num_16bit_static_fields != 0) {
844 --num_16bit_static_fields;
845 gap -= sizeof(uint16_t);
846 }
847 // Shuffle byte fields forward.
848 while (gap >= sizeof(uint8_t) && num_8bit_static_fields != 0) {
849 --num_8bit_static_fields;
850 gap -= sizeof(uint8_t);
851 }
852 }
853 // Guaranteed to be at least 4 byte aligned. No need for further alignments.
854 // Space used for primitive static fields.
855 size += num_8bit_static_fields * sizeof(uint8_t) + num_16bit_static_fields * sizeof(uint16_t) +
856 num_32bit_static_fields * sizeof(uint32_t) + num_64bit_static_fields * sizeof(uint64_t);
857 return size;
858 }
859
860 template<ReadBarrierOption kReadBarrierOption>
IsReferenceClass()861 inline bool Class::IsReferenceClass() const {
862 return this == Reference::GetJavaLangRefReference<kReadBarrierOption>();
863 }
864
865 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
IsClassClass()866 inline bool Class::IsClassClass() {
867 ObjPtr<Class> java_lang_Class = GetClass<kVerifyFlags, kReadBarrierOption>()->
868 template GetClass<kVerifyFlags, kReadBarrierOption>();
869 return this == java_lang_Class;
870 }
871
GetDexFile()872 inline const DexFile& Class::GetDexFile() {
873 // From-space version is the same as the to-space version since the dex file never changes.
874 // Avoiding the read barrier here is important to prevent recursive AssertToSpaceInvariant issues
875 // from PrettyTypeOf.
876 return *GetDexCache<kDefaultVerifyFlags, kWithoutReadBarrier>()->GetDexFile();
877 }
878
DescriptorEquals(const char * match)879 inline bool Class::DescriptorEquals(const char* match) {
880 if (IsArrayClass()) {
881 return match[0] == '[' && GetComponentType()->DescriptorEquals(match + 1);
882 } else if (IsPrimitive()) {
883 return strcmp(Primitive::Descriptor(GetPrimitiveType()), match) == 0;
884 } else if (IsProxyClass()) {
885 return ProxyDescriptorEquals(match);
886 } else {
887 const DexFile& dex_file = GetDexFile();
888 const DexFile::TypeId& type_id = dex_file.GetTypeId(GetClassDef()->class_idx_);
889 return strcmp(dex_file.GetTypeDescriptor(type_id), match) == 0;
890 }
891 }
892
AssertInitializedOrInitializingInThread(Thread * self)893 inline void Class::AssertInitializedOrInitializingInThread(Thread* self) {
894 if (kIsDebugBuild && !IsInitialized()) {
895 CHECK(IsInitializing()) << PrettyClass() << " is not initializing: " << GetStatus();
896 CHECK_EQ(GetClinitThreadId(), self->GetTid()) << PrettyClass()
897 << " is initializing in a different thread";
898 }
899 }
900
GetProxyInterfaces()901 inline ObjectArray<Class>* Class::GetProxyInterfaces() {
902 CHECK(IsProxyClass());
903 // First static field.
904 auto* field = GetStaticField(0);
905 DCHECK_STREQ(field->GetName(), "interfaces");
906 MemberOffset field_offset = field->GetOffset();
907 return GetFieldObject<ObjectArray<Class>>(field_offset);
908 }
909
GetProxyThrows()910 inline ObjectArray<ObjectArray<Class>>* Class::GetProxyThrows() {
911 CHECK(IsProxyClass());
912 // Second static field.
913 auto* field = GetStaticField(1);
914 DCHECK_STREQ(field->GetName(), "throws");
915 MemberOffset field_offset = field->GetOffset();
916 return GetFieldObject<ObjectArray<ObjectArray<Class>>>(field_offset);
917 }
918
GetDisableIntrinsicFlagOffset()919 inline MemberOffset Class::GetDisableIntrinsicFlagOffset() {
920 CHECK(IsReferenceClass());
921 // First static field
922 auto* field = GetStaticField(0);
923 DCHECK_STREQ(field->GetName(), "disableIntrinsic");
924 return field->GetOffset();
925 }
926
GetSlowPathFlagOffset()927 inline MemberOffset Class::GetSlowPathFlagOffset() {
928 CHECK(IsReferenceClass());
929 // Second static field
930 auto* field = GetStaticField(1);
931 DCHECK_STREQ(field->GetName(), "slowPathEnabled");
932 return field->GetOffset();
933 }
934
GetSlowPathEnabled()935 inline bool Class::GetSlowPathEnabled() {
936 return GetFieldBoolean(GetSlowPathFlagOffset());
937 }
938
SetSlowPath(bool enabled)939 inline void Class::SetSlowPath(bool enabled) {
940 SetFieldBoolean<false, false>(GetSlowPathFlagOffset(), enabled);
941 }
942
operator()943 inline void Class::InitializeClassVisitor::operator()(ObjPtr<Object> obj,
944 size_t usable_size) const {
945 DCHECK_LE(class_size_, usable_size);
946 // Avoid AsClass as object is not yet in live bitmap or allocation stack.
947 ObjPtr<Class> klass = ObjPtr<Class>::DownCast(obj);
948 klass->SetClassSize(class_size_);
949 klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive.
950 klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index.
951 klass->SetDexTypeIndex(dex::TypeIndex(DexFile::kDexNoIndex16)); // Default to no valid type
952 // index.
953 // Default to force slow path until initialized.
954 klass->SetObjectSizeAllocFastPath(std::numeric_limits<uint32_t>::max());
955 }
956
SetAccessFlags(uint32_t new_access_flags)957 inline void Class::SetAccessFlags(uint32_t new_access_flags) {
958 // Called inside a transaction when setting pre-verified flag during boot image compilation.
959 if (Runtime::Current()->IsActiveTransaction()) {
960 SetField32<true>(AccessFlagsOffset(), new_access_flags);
961 } else {
962 SetField32<false>(AccessFlagsOffset(), new_access_flags);
963 }
964 }
965
SetClassFlags(uint32_t new_flags)966 inline void Class::SetClassFlags(uint32_t new_flags) {
967 if (Runtime::Current()->IsActiveTransaction()) {
968 SetField32<true>(OFFSET_OF_OBJECT_MEMBER(Class, class_flags_), new_flags);
969 } else {
970 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_flags_), new_flags);
971 }
972 }
973
NumDirectInterfaces()974 inline uint32_t Class::NumDirectInterfaces() {
975 if (IsPrimitive()) {
976 return 0;
977 } else if (IsArrayClass()) {
978 return 2;
979 } else if (IsProxyClass()) {
980 ObjectArray<Class>* interfaces = GetProxyInterfaces();
981 return interfaces != nullptr ? interfaces->GetLength() : 0;
982 } else {
983 const DexFile::TypeList* interfaces = GetInterfaceTypeList();
984 if (interfaces == nullptr) {
985 return 0;
986 } else {
987 return interfaces->Size();
988 }
989 }
990 }
991
GetDirectMethods(PointerSize pointer_size)992 inline ArraySlice<ArtMethod> Class::GetDirectMethods(PointerSize pointer_size) {
993 CheckPointerSize(pointer_size);
994 return GetDirectMethodsSliceUnchecked(pointer_size);
995 }
996
GetDeclaredMethods(PointerSize pointer_size)997 inline ArraySlice<ArtMethod> Class::GetDeclaredMethods(
998 PointerSize pointer_size) {
999 return GetDeclaredMethodsSliceUnchecked(pointer_size);
1000 }
1001
GetDeclaredVirtualMethods(PointerSize pointer_size)1002 inline ArraySlice<ArtMethod> Class::GetDeclaredVirtualMethods(
1003 PointerSize pointer_size) {
1004 return GetDeclaredVirtualMethodsSliceUnchecked(pointer_size);
1005 }
1006
GetVirtualMethods(PointerSize pointer_size)1007 inline ArraySlice<ArtMethod> Class::GetVirtualMethods(
1008 PointerSize pointer_size) {
1009 CheckPointerSize(pointer_size);
1010 return GetVirtualMethodsSliceUnchecked(pointer_size);
1011 }
1012
GetCopiedMethods(PointerSize pointer_size)1013 inline ArraySlice<ArtMethod> Class::GetCopiedMethods(PointerSize pointer_size) {
1014 CheckPointerSize(pointer_size);
1015 return GetCopiedMethodsSliceUnchecked(pointer_size);
1016 }
1017
1018
GetMethods(PointerSize pointer_size)1019 inline ArraySlice<ArtMethod> Class::GetMethods(PointerSize pointer_size) {
1020 CheckPointerSize(pointer_size);
1021 LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
1022 return GetMethodsSliceRangeUnchecked(methods, pointer_size, 0u, NumMethods(methods));
1023 }
1024
GetIFields()1025 inline IterationRange<StrideIterator<ArtField>> Class::GetIFields() {
1026 return MakeIterationRangeFromLengthPrefixedArray(GetIFieldsPtr());
1027 }
1028
GetSFields()1029 inline IterationRange<StrideIterator<ArtField>> Class::GetSFields() {
1030 return MakeIterationRangeFromLengthPrefixedArray(GetSFieldsPtr());
1031 }
1032
GetIFieldsUnchecked()1033 inline IterationRange<StrideIterator<ArtField>> Class::GetIFieldsUnchecked() {
1034 return MakeIterationRangeFromLengthPrefixedArray(GetIFieldsPtrUnchecked());
1035 }
1036
GetSFieldsUnchecked()1037 inline IterationRange<StrideIterator<ArtField>> Class::GetSFieldsUnchecked() {
1038 return MakeIterationRangeFromLengthPrefixedArray(GetSFieldsPtrUnchecked());
1039 }
1040
EmbeddedVTableOffset(PointerSize pointer_size)1041 inline MemberOffset Class::EmbeddedVTableOffset(PointerSize pointer_size) {
1042 CheckPointerSize(pointer_size);
1043 return MemberOffset(ImtPtrOffset(pointer_size).Uint32Value() + static_cast<size_t>(pointer_size));
1044 }
1045
CheckPointerSize(PointerSize pointer_size)1046 inline void Class::CheckPointerSize(PointerSize pointer_size) {
1047 DCHECK_EQ(pointer_size, Runtime::Current()->GetClassLinker()->GetImagePointerSize());
1048 }
1049
1050 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
GetComponentType()1051 inline Class* Class::GetComponentType() {
1052 return GetFieldObject<Class, kVerifyFlags, kReadBarrierOption>(ComponentTypeOffset());
1053 }
1054
1055 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
IsArrayClass()1056 inline bool Class::IsArrayClass() {
1057 return GetComponentType<kVerifyFlags, kReadBarrierOption>() != nullptr;
1058 }
1059
1060 template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
IsObjectArrayClass()1061 inline bool Class::IsObjectArrayClass() {
1062 ObjPtr<Class> const component_type = GetComponentType<kVerifyFlags, kReadBarrierOption>();
1063 return component_type != nullptr && !component_type->IsPrimitive();
1064 }
1065
IsAssignableFrom(ObjPtr<Class> src)1066 inline bool Class::IsAssignableFrom(ObjPtr<Class> src) {
1067 DCHECK(src != nullptr);
1068 if (this == src) {
1069 // Can always assign to things of the same type.
1070 return true;
1071 } else if (IsObjectClass()) {
1072 // Can assign any reference to java.lang.Object.
1073 return !src->IsPrimitive();
1074 } else if (IsInterface()) {
1075 return src->Implements(this);
1076 } else if (src->IsArrayClass()) {
1077 return IsAssignableFromArray(src);
1078 } else {
1079 return !src->IsInterface() && src->IsSubClass(this);
1080 }
1081 }
1082
NumDirectMethods()1083 inline uint32_t Class::NumDirectMethods() {
1084 return GetVirtualMethodsStartOffset();
1085 }
1086
NumDeclaredVirtualMethods()1087 inline uint32_t Class::NumDeclaredVirtualMethods() {
1088 return GetCopiedMethodsStartOffset() - GetVirtualMethodsStartOffset();
1089 }
1090
NumVirtualMethods()1091 inline uint32_t Class::NumVirtualMethods() {
1092 return NumMethods() - GetVirtualMethodsStartOffset();
1093 }
1094
NumInstanceFields()1095 inline uint32_t Class::NumInstanceFields() {
1096 LengthPrefixedArray<ArtField>* arr = GetIFieldsPtrUnchecked();
1097 return arr != nullptr ? arr->size() : 0u;
1098 }
1099
NumStaticFields()1100 inline uint32_t Class::NumStaticFields() {
1101 LengthPrefixedArray<ArtField>* arr = GetSFieldsPtrUnchecked();
1102 return arr != nullptr ? arr->size() : 0u;
1103 }
1104
1105 template <VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption, typename Visitor>
FixupNativePointers(Class * dest,PointerSize pointer_size,const Visitor & visitor)1106 inline void Class::FixupNativePointers(Class* dest,
1107 PointerSize pointer_size,
1108 const Visitor& visitor) {
1109 // Update the field arrays.
1110 LengthPrefixedArray<ArtField>* const sfields = GetSFieldsPtr();
1111 LengthPrefixedArray<ArtField>* const new_sfields = visitor(sfields);
1112 if (sfields != new_sfields) {
1113 dest->SetSFieldsPtrUnchecked(new_sfields);
1114 }
1115 LengthPrefixedArray<ArtField>* const ifields = GetIFieldsPtr();
1116 LengthPrefixedArray<ArtField>* const new_ifields = visitor(ifields);
1117 if (ifields != new_ifields) {
1118 dest->SetIFieldsPtrUnchecked(new_ifields);
1119 }
1120 // Update method array.
1121 LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
1122 LengthPrefixedArray<ArtMethod>* new_methods = visitor(methods);
1123 if (methods != new_methods) {
1124 dest->SetMethodsPtrInternal(new_methods);
1125 }
1126 // Fix up embedded tables.
1127 if (!IsTemp() && ShouldHaveEmbeddedVTable<kVerifyNone, kReadBarrierOption>()) {
1128 for (int32_t i = 0, count = GetEmbeddedVTableLength(); i < count; ++i) {
1129 ArtMethod* method = GetEmbeddedVTableEntry(i, pointer_size);
1130 void** dest_addr = reinterpret_cast<void**>(reinterpret_cast<uintptr_t>(dest) +
1131 EmbeddedVTableEntryOffset(i, pointer_size).Uint32Value());
1132 ArtMethod* new_method = visitor(method, dest_addr);
1133 if (method != new_method) {
1134 dest->SetEmbeddedVTableEntryUnchecked(i, new_method, pointer_size);
1135 }
1136 }
1137 }
1138 if (!IsTemp() && ShouldHaveImt<kVerifyNone, kReadBarrierOption>()) {
1139 dest->SetImt(visitor(GetImt(pointer_size)), pointer_size);
1140 }
1141 }
1142
CanAccess(ObjPtr<Class> that)1143 inline bool Class::CanAccess(ObjPtr<Class> that) {
1144 return that->IsPublic() || this->IsInSamePackage(that);
1145 }
1146
1147
CanAccessMember(ObjPtr<Class> access_to,uint32_t member_flags)1148 inline bool Class::CanAccessMember(ObjPtr<Class> access_to, uint32_t member_flags) {
1149 // Classes can access all of their own members
1150 if (this == access_to) {
1151 return true;
1152 }
1153 // Public members are trivially accessible
1154 if (member_flags & kAccPublic) {
1155 return true;
1156 }
1157 // Private members are trivially not accessible
1158 if (member_flags & kAccPrivate) {
1159 return false;
1160 }
1161 // Check for protected access from a sub-class, which may or may not be in the same package.
1162 if (member_flags & kAccProtected) {
1163 if (!this->IsInterface() && this->IsSubClass(access_to)) {
1164 return true;
1165 }
1166 }
1167 // Allow protected access from other classes in the same package.
1168 return this->IsInSamePackage(access_to);
1169 }
1170
CannotBeAssignedFromOtherTypes()1171 inline bool Class::CannotBeAssignedFromOtherTypes() {
1172 if (!IsArrayClass()) {
1173 return IsFinal();
1174 }
1175 ObjPtr<Class> component = GetComponentType();
1176 return component->IsPrimitive() || component->CannotBeAssignedFromOtherTypes();
1177 }
1178
1179 } // namespace mirror
1180 } // namespace art
1181
1182 #endif // ART_RUNTIME_MIRROR_CLASS_INL_H_
1183