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