1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "class.h"
18
19 #include "art_field-inl.h"
20 #include "art_method-inl.h"
21 #include "class_linker-inl.h"
22 #include "class_loader.h"
23 #include "class-inl.h"
24 #include "dex_cache.h"
25 #include "dex_file-inl.h"
26 #include "gc/accounting/card_table-inl.h"
27 #include "handle_scope-inl.h"
28 #include "method.h"
29 #include "object_array-inl.h"
30 #include "object-inl.h"
31 #include "runtime.h"
32 #include "thread.h"
33 #include "throwable.h"
34 #include "utils.h"
35 #include "well_known_classes.h"
36
37 namespace art {
38 namespace mirror {
39
40 GcRoot<Class> Class::java_lang_Class_;
41
SetClassClass(Class * java_lang_Class)42 void Class::SetClassClass(Class* java_lang_Class) {
43 CHECK(java_lang_Class_.IsNull())
44 << java_lang_Class_.Read()
45 << " " << java_lang_Class;
46 CHECK(java_lang_Class != nullptr);
47 java_lang_Class->SetClassFlags(mirror::kClassFlagClass);
48 java_lang_Class_ = GcRoot<Class>(java_lang_Class);
49 }
50
ResetClass()51 void Class::ResetClass() {
52 CHECK(!java_lang_Class_.IsNull());
53 java_lang_Class_ = GcRoot<Class>(nullptr);
54 }
55
VisitRoots(RootVisitor * visitor)56 void Class::VisitRoots(RootVisitor* visitor) {
57 java_lang_Class_.VisitRootIfNonNull(visitor, RootInfo(kRootStickyClass));
58 }
59
SetVerifyError(mirror::Object * error)60 inline void Class::SetVerifyError(mirror::Object* error) {
61 CHECK(error != nullptr) << PrettyClass(this);
62 if (Runtime::Current()->IsActiveTransaction()) {
63 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Class, verify_error_), error);
64 } else {
65 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, verify_error_), error);
66 }
67 }
68
SetStatus(Handle<Class> h_this,Status new_status,Thread * self)69 void Class::SetStatus(Handle<Class> h_this, Status new_status, Thread* self) {
70 Status old_status = h_this->GetStatus();
71 ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
72 bool class_linker_initialized = class_linker != nullptr && class_linker->IsInitialized();
73 if (LIKELY(class_linker_initialized)) {
74 if (UNLIKELY(new_status <= old_status && new_status != kStatusError &&
75 new_status != kStatusRetired)) {
76 LOG(FATAL) << "Unexpected change back of class status for " << PrettyClass(h_this.Get())
77 << " " << old_status << " -> " << new_status;
78 }
79 if (new_status >= kStatusResolved || old_status >= kStatusResolved) {
80 // When classes are being resolved the resolution code should hold the lock.
81 CHECK_EQ(h_this->GetLockOwnerThreadId(), self->GetThreadId())
82 << "Attempt to change status of class while not holding its lock: "
83 << PrettyClass(h_this.Get()) << " " << old_status << " -> " << new_status;
84 }
85 }
86 if (UNLIKELY(new_status == kStatusError)) {
87 CHECK_NE(h_this->GetStatus(), kStatusError)
88 << "Attempt to set as erroneous an already erroneous class "
89 << PrettyClass(h_this.Get());
90 if (VLOG_IS_ON(class_linker)) {
91 LOG(ERROR) << "Setting " << PrettyDescriptor(h_this.Get()) << " to erroneous.";
92 if (self->IsExceptionPending()) {
93 LOG(ERROR) << "Exception: " << self->GetException()->Dump();
94 }
95 }
96
97 // Remember the current exception.
98 CHECK(self->GetException() != nullptr);
99 h_this->SetVerifyError(self->GetException());
100 }
101 static_assert(sizeof(Status) == sizeof(uint32_t), "Size of status not equal to uint32");
102 if (Runtime::Current()->IsActiveTransaction()) {
103 h_this->SetField32Volatile<true>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status);
104 } else {
105 h_this->SetField32Volatile<false>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status);
106 }
107
108 if (!class_linker_initialized) {
109 // When the class linker is being initialized its single threaded and by definition there can be
110 // no waiters. During initialization classes may appear temporary but won't be retired as their
111 // size was statically computed.
112 } else {
113 // Classes that are being resolved or initialized need to notify waiters that the class status
114 // changed. See ClassLinker::EnsureResolved and ClassLinker::WaitForInitializeClass.
115 if (h_this->IsTemp()) {
116 // Class is a temporary one, ensure that waiters for resolution get notified of retirement
117 // so that they can grab the new version of the class from the class linker's table.
118 CHECK_LT(new_status, kStatusResolved) << PrettyDescriptor(h_this.Get());
119 if (new_status == kStatusRetired || new_status == kStatusError) {
120 h_this->NotifyAll(self);
121 }
122 } else {
123 CHECK_NE(new_status, kStatusRetired);
124 if (old_status >= kStatusResolved || new_status >= kStatusResolved) {
125 h_this->NotifyAll(self);
126 }
127 }
128 }
129 }
130
SetDexCache(DexCache * new_dex_cache)131 void Class::SetDexCache(DexCache* new_dex_cache) {
132 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_), new_dex_cache);
133 SetDexCacheStrings(new_dex_cache != nullptr ? new_dex_cache->GetStrings() : nullptr);
134 }
135
SetClassSize(uint32_t new_class_size)136 void Class::SetClassSize(uint32_t new_class_size) {
137 if (kIsDebugBuild && new_class_size < GetClassSize()) {
138 DumpClass(LOG(INTERNAL_FATAL), kDumpClassFullDetail);
139 LOG(INTERNAL_FATAL) << new_class_size << " vs " << GetClassSize();
140 LOG(FATAL) << " class=" << PrettyTypeOf(this);
141 }
142 // Not called within a transaction.
143 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_size_), new_class_size);
144 }
145
146 // Return the class' name. The exact format is bizarre, but it's the specified behavior for
147 // Class.getName: keywords for primitive types, regular "[I" form for primitive arrays (so "int"
148 // but "[I"), and arrays of reference types written between "L" and ";" but with dots rather than
149 // slashes (so "java.lang.String" but "[Ljava.lang.String;"). Madness.
ComputeName(Handle<Class> h_this)150 String* Class::ComputeName(Handle<Class> h_this) {
151 String* name = h_this->GetName();
152 if (name != nullptr) {
153 return name;
154 }
155 std::string temp;
156 const char* descriptor = h_this->GetDescriptor(&temp);
157 Thread* self = Thread::Current();
158 if ((descriptor[0] != 'L') && (descriptor[0] != '[')) {
159 // The descriptor indicates that this is the class for
160 // a primitive type; special-case the return value.
161 const char* c_name = nullptr;
162 switch (descriptor[0]) {
163 case 'Z': c_name = "boolean"; break;
164 case 'B': c_name = "byte"; break;
165 case 'C': c_name = "char"; break;
166 case 'S': c_name = "short"; break;
167 case 'I': c_name = "int"; break;
168 case 'J': c_name = "long"; break;
169 case 'F': c_name = "float"; break;
170 case 'D': c_name = "double"; break;
171 case 'V': c_name = "void"; break;
172 default:
173 LOG(FATAL) << "Unknown primitive type: " << PrintableChar(descriptor[0]);
174 }
175 name = String::AllocFromModifiedUtf8(self, c_name);
176 } else {
177 // Convert the UTF-8 name to a java.lang.String. The name must use '.' to separate package
178 // components.
179 name = String::AllocFromModifiedUtf8(self, DescriptorToDot(descriptor).c_str());
180 }
181 h_this->SetName(name);
182 return name;
183 }
184
DumpClass(std::ostream & os,int flags)185 void Class::DumpClass(std::ostream& os, int flags) {
186 if ((flags & kDumpClassFullDetail) == 0) {
187 os << PrettyClass(this);
188 if ((flags & kDumpClassClassLoader) != 0) {
189 os << ' ' << GetClassLoader();
190 }
191 if ((flags & kDumpClassInitialized) != 0) {
192 os << ' ' << GetStatus();
193 }
194 os << "\n";
195 return;
196 }
197
198 Thread* const self = Thread::Current();
199 StackHandleScope<2> hs(self);
200 Handle<mirror::Class> h_this(hs.NewHandle(this));
201 Handle<mirror::Class> h_super(hs.NewHandle(GetSuperClass()));
202 auto image_pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
203
204 std::string temp;
205 os << "----- " << (IsInterface() ? "interface" : "class") << " "
206 << "'" << GetDescriptor(&temp) << "' cl=" << GetClassLoader() << " -----\n",
207 os << " objectSize=" << SizeOf() << " "
208 << "(" << (h_super.Get() != nullptr ? h_super->SizeOf() : -1) << " from super)\n",
209 os << StringPrintf(" access=0x%04x.%04x\n",
210 GetAccessFlags() >> 16, GetAccessFlags() & kAccJavaFlagsMask);
211 if (h_super.Get() != nullptr) {
212 os << " super='" << PrettyClass(h_super.Get()) << "' (cl=" << h_super->GetClassLoader()
213 << ")\n";
214 }
215 if (IsArrayClass()) {
216 os << " componentType=" << PrettyClass(GetComponentType()) << "\n";
217 }
218 const size_t num_direct_interfaces = NumDirectInterfaces();
219 if (num_direct_interfaces > 0) {
220 os << " interfaces (" << num_direct_interfaces << "):\n";
221 for (size_t i = 0; i < num_direct_interfaces; ++i) {
222 Class* interface = GetDirectInterface(self, h_this, i);
223 if (interface == nullptr) {
224 os << StringPrintf(" %2zd: nullptr!\n", i);
225 } else {
226 const ClassLoader* cl = interface->GetClassLoader();
227 os << StringPrintf(" %2zd: %s (cl=%p)\n", i, PrettyClass(interface).c_str(), cl);
228 }
229 }
230 }
231 if (!IsLoaded()) {
232 os << " class not yet loaded";
233 } else {
234 // After this point, this may have moved due to GetDirectInterface.
235 os << " vtable (" << h_this->NumVirtualMethods() << " entries, "
236 << (h_super.Get() != nullptr ? h_super->NumVirtualMethods() : 0) << " in super):\n";
237 for (size_t i = 0; i < NumVirtualMethods(); ++i) {
238 os << StringPrintf(" %2zd: %s\n", i, PrettyMethod(
239 h_this->GetVirtualMethodDuringLinking(i, image_pointer_size)).c_str());
240 }
241 os << " direct methods (" << h_this->NumDirectMethods() << " entries):\n";
242 for (size_t i = 0; i < h_this->NumDirectMethods(); ++i) {
243 os << StringPrintf(" %2zd: %s\n", i, PrettyMethod(
244 h_this->GetDirectMethod(i, image_pointer_size)).c_str());
245 }
246 if (h_this->NumStaticFields() > 0) {
247 os << " static fields (" << h_this->NumStaticFields() << " entries):\n";
248 if (h_this->IsResolved() || h_this->IsErroneous()) {
249 for (size_t i = 0; i < h_this->NumStaticFields(); ++i) {
250 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetStaticField(i)).c_str());
251 }
252 } else {
253 os << " <not yet available>";
254 }
255 }
256 if (h_this->NumInstanceFields() > 0) {
257 os << " instance fields (" << h_this->NumInstanceFields() << " entries):\n";
258 if (h_this->IsResolved() || h_this->IsErroneous()) {
259 for (size_t i = 0; i < h_this->NumInstanceFields(); ++i) {
260 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetInstanceField(i)).c_str());
261 }
262 } else {
263 os << " <not yet available>";
264 }
265 }
266 }
267 }
268
SetReferenceInstanceOffsets(uint32_t new_reference_offsets)269 void Class::SetReferenceInstanceOffsets(uint32_t new_reference_offsets) {
270 if (kIsDebugBuild && new_reference_offsets != kClassWalkSuper) {
271 // Sanity check that the number of bits set in the reference offset bitmap
272 // agrees with the number of references
273 uint32_t count = 0;
274 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) {
275 count += c->NumReferenceInstanceFieldsDuringLinking();
276 }
277 // +1 for the Class in Object.
278 CHECK_EQ(static_cast<uint32_t>(POPCOUNT(new_reference_offsets)) + 1, count);
279 }
280 // Not called within a transaction.
281 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_),
282 new_reference_offsets);
283 }
284
IsInSamePackage(const StringPiece & descriptor1,const StringPiece & descriptor2)285 bool Class::IsInSamePackage(const StringPiece& descriptor1, const StringPiece& descriptor2) {
286 size_t i = 0;
287 size_t min_length = std::min(descriptor1.size(), descriptor2.size());
288 while (i < min_length && descriptor1[i] == descriptor2[i]) {
289 ++i;
290 }
291 if (descriptor1.find('/', i) != StringPiece::npos ||
292 descriptor2.find('/', i) != StringPiece::npos) {
293 return false;
294 } else {
295 return true;
296 }
297 }
298
IsInSamePackage(Class * that)299 bool Class::IsInSamePackage(Class* that) {
300 Class* klass1 = this;
301 Class* klass2 = that;
302 if (klass1 == klass2) {
303 return true;
304 }
305 // Class loaders must match.
306 if (klass1->GetClassLoader() != klass2->GetClassLoader()) {
307 return false;
308 }
309 // Arrays are in the same package when their element classes are.
310 while (klass1->IsArrayClass()) {
311 klass1 = klass1->GetComponentType();
312 }
313 while (klass2->IsArrayClass()) {
314 klass2 = klass2->GetComponentType();
315 }
316 // trivial check again for array types
317 if (klass1 == klass2) {
318 return true;
319 }
320 // Compare the package part of the descriptor string.
321 std::string temp1, temp2;
322 return IsInSamePackage(klass1->GetDescriptor(&temp1), klass2->GetDescriptor(&temp2));
323 }
324
IsThrowableClass()325 bool Class::IsThrowableClass() {
326 return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this);
327 }
328
SetClassLoader(ClassLoader * new_class_loader)329 void Class::SetClassLoader(ClassLoader* new_class_loader) {
330 if (Runtime::Current()->IsActiveTransaction()) {
331 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader);
332 } else {
333 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader);
334 }
335 }
336
FindInterfaceMethod(const StringPiece & name,const StringPiece & signature,size_t pointer_size)337 ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const StringPiece& signature,
338 size_t pointer_size) {
339 // Check the current class before checking the interfaces.
340 ArtMethod* method = FindDeclaredVirtualMethod(name, signature, pointer_size);
341 if (method != nullptr) {
342 return method;
343 }
344
345 int32_t iftable_count = GetIfTableCount();
346 IfTable* iftable = GetIfTable();
347 for (int32_t i = 0; i < iftable_count; ++i) {
348 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature, pointer_size);
349 if (method != nullptr) {
350 return method;
351 }
352 }
353 return nullptr;
354 }
355
FindInterfaceMethod(const StringPiece & name,const Signature & signature,size_t pointer_size)356 ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const Signature& signature,
357 size_t pointer_size) {
358 // Check the current class before checking the interfaces.
359 ArtMethod* method = FindDeclaredVirtualMethod(name, signature, pointer_size);
360 if (method != nullptr) {
361 return method;
362 }
363
364 int32_t iftable_count = GetIfTableCount();
365 IfTable* iftable = GetIfTable();
366 for (int32_t i = 0; i < iftable_count; ++i) {
367 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature, pointer_size);
368 if (method != nullptr) {
369 return method;
370 }
371 }
372 return nullptr;
373 }
374
FindInterfaceMethod(const DexCache * dex_cache,uint32_t dex_method_idx,size_t pointer_size)375 ArtMethod* Class::FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx,
376 size_t pointer_size) {
377 // Check the current class before checking the interfaces.
378 ArtMethod* method = FindDeclaredVirtualMethod(dex_cache, dex_method_idx, pointer_size);
379 if (method != nullptr) {
380 return method;
381 }
382
383 int32_t iftable_count = GetIfTableCount();
384 IfTable* iftable = GetIfTable();
385 for (int32_t i = 0; i < iftable_count; ++i) {
386 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(
387 dex_cache, dex_method_idx, pointer_size);
388 if (method != nullptr) {
389 return method;
390 }
391 }
392 return nullptr;
393 }
394
FindDeclaredDirectMethod(const StringPiece & name,const StringPiece & signature,size_t pointer_size)395 ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature,
396 size_t pointer_size) {
397 for (auto& method : GetDirectMethods(pointer_size)) {
398 if (name == method.GetName() && method.GetSignature() == signature) {
399 return &method;
400 }
401 }
402 return nullptr;
403 }
404
FindDeclaredDirectMethod(const StringPiece & name,const Signature & signature,size_t pointer_size)405 ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const Signature& signature,
406 size_t pointer_size) {
407 for (auto& method : GetDirectMethods(pointer_size)) {
408 if (name == method.GetName() && signature == method.GetSignature()) {
409 return &method;
410 }
411 }
412 return nullptr;
413 }
414
FindDeclaredDirectMethod(const DexCache * dex_cache,uint32_t dex_method_idx,size_t pointer_size)415 ArtMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx,
416 size_t pointer_size) {
417 if (GetDexCache() == dex_cache) {
418 for (auto& method : GetDirectMethods(pointer_size)) {
419 if (method.GetDexMethodIndex() == dex_method_idx) {
420 return &method;
421 }
422 }
423 }
424 return nullptr;
425 }
426
FindDirectMethod(const StringPiece & name,const StringPiece & signature,size_t pointer_size)427 ArtMethod* Class::FindDirectMethod(const StringPiece& name, const StringPiece& signature,
428 size_t pointer_size) {
429 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
430 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature, pointer_size);
431 if (method != nullptr) {
432 return method;
433 }
434 }
435 return nullptr;
436 }
437
FindDirectMethod(const StringPiece & name,const Signature & signature,size_t pointer_size)438 ArtMethod* Class::FindDirectMethod(const StringPiece& name, const Signature& signature,
439 size_t pointer_size) {
440 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
441 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature, pointer_size);
442 if (method != nullptr) {
443 return method;
444 }
445 }
446 return nullptr;
447 }
448
FindDirectMethod(const DexCache * dex_cache,uint32_t dex_method_idx,size_t pointer_size)449 ArtMethod* Class::FindDirectMethod(
450 const DexCache* dex_cache, uint32_t dex_method_idx, size_t pointer_size) {
451 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
452 ArtMethod* method = klass->FindDeclaredDirectMethod(dex_cache, dex_method_idx, pointer_size);
453 if (method != nullptr) {
454 return method;
455 }
456 }
457 return nullptr;
458 }
459
FindDeclaredDirectMethodByName(const StringPiece & name,size_t pointer_size)460 ArtMethod* Class::FindDeclaredDirectMethodByName(const StringPiece& name, size_t pointer_size) {
461 for (auto& method : GetDirectMethods(pointer_size)) {
462 ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size);
463 if (name == np_method->GetName()) {
464 return &method;
465 }
466 }
467 return nullptr;
468 }
469
470 // TODO These should maybe be changed to be named FindOwnedVirtualMethod or something similar
471 // because they do not only find 'declared' methods and will return copied methods. This behavior is
472 // desired and correct but the naming can lead to confusion because in the java language declared
473 // excludes interface methods which might be found by this.
FindDeclaredVirtualMethod(const StringPiece & name,const StringPiece & signature,size_t pointer_size)474 ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const StringPiece& signature,
475 size_t pointer_size) {
476 for (auto& method : GetVirtualMethods(pointer_size)) {
477 ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size);
478 if (name == np_method->GetName() && np_method->GetSignature() == signature) {
479 return &method;
480 }
481 }
482 return nullptr;
483 }
484
FindDeclaredVirtualMethod(const StringPiece & name,const Signature & signature,size_t pointer_size)485 ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const Signature& signature,
486 size_t pointer_size) {
487 for (auto& method : GetVirtualMethods(pointer_size)) {
488 ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size);
489 if (name == np_method->GetName() && signature == np_method->GetSignature()) {
490 return &method;
491 }
492 }
493 return nullptr;
494 }
495
FindDeclaredVirtualMethod(const DexCache * dex_cache,uint32_t dex_method_idx,size_t pointer_size)496 ArtMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx,
497 size_t pointer_size) {
498 if (GetDexCache() == dex_cache) {
499 for (auto& method : GetDeclaredVirtualMethods(pointer_size)) {
500 if (method.GetDexMethodIndex() == dex_method_idx) {
501 return &method;
502 }
503 }
504 }
505 return nullptr;
506 }
507
FindDeclaredVirtualMethodByName(const StringPiece & name,size_t pointer_size)508 ArtMethod* Class::FindDeclaredVirtualMethodByName(const StringPiece& name, size_t pointer_size) {
509 for (auto& method : GetVirtualMethods(pointer_size)) {
510 ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size);
511 if (name == np_method->GetName()) {
512 return &method;
513 }
514 }
515 return nullptr;
516 }
517
FindVirtualMethod(const StringPiece & name,const StringPiece & signature,size_t pointer_size)518 ArtMethod* Class::FindVirtualMethod(
519 const StringPiece& name, const StringPiece& signature, size_t pointer_size) {
520 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
521 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature, pointer_size);
522 if (method != nullptr) {
523 return method;
524 }
525 }
526 return nullptr;
527 }
528
FindVirtualMethod(const StringPiece & name,const Signature & signature,size_t pointer_size)529 ArtMethod* Class::FindVirtualMethod(
530 const StringPiece& name, const Signature& signature, size_t pointer_size) {
531 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
532 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature, pointer_size);
533 if (method != nullptr) {
534 return method;
535 }
536 }
537 return nullptr;
538 }
539
FindVirtualMethod(const DexCache * dex_cache,uint32_t dex_method_idx,size_t pointer_size)540 ArtMethod* Class::FindVirtualMethod(
541 const DexCache* dex_cache, uint32_t dex_method_idx, size_t pointer_size) {
542 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
543 ArtMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx, pointer_size);
544 if (method != nullptr) {
545 return method;
546 }
547 }
548 return nullptr;
549 }
550
FindVirtualMethodForInterfaceSuper(ArtMethod * method,size_t pointer_size)551 ArtMethod* Class::FindVirtualMethodForInterfaceSuper(ArtMethod* method, size_t pointer_size) {
552 DCHECK(method->GetDeclaringClass()->IsInterface());
553 DCHECK(IsInterface()) << "Should only be called on a interface class";
554 // Check if we have one defined on this interface first. This includes searching copied ones to
555 // get any conflict methods. Conflict methods are copied into each subtype from the supertype. We
556 // don't do any indirect method checks here.
557 for (ArtMethod& iface_method : GetVirtualMethods(pointer_size)) {
558 if (method->HasSameNameAndSignature(&iface_method)) {
559 return &iface_method;
560 }
561 }
562
563 std::vector<ArtMethod*> abstract_methods;
564 // Search through the IFTable for a working version. We don't need to check for conflicts
565 // because if there was one it would appear in this classes virtual_methods_ above.
566
567 Thread* self = Thread::Current();
568 StackHandleScope<2> hs(self);
569 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(GetIfTable()));
570 MutableHandle<mirror::Class> iface(hs.NewHandle<mirror::Class>(nullptr));
571 size_t iftable_count = GetIfTableCount();
572 // Find the method. We don't need to check for conflicts because they would have been in the
573 // copied virtuals of this interface. Order matters, traverse in reverse topological order; most
574 // subtypiest interfaces get visited first.
575 for (size_t k = iftable_count; k != 0;) {
576 k--;
577 DCHECK_LT(k, iftable->Count());
578 iface.Assign(iftable->GetInterface(k));
579 // Iterate through every declared method on this interface. Each direct method's name/signature
580 // is unique so the order of the inner loop doesn't matter.
581 for (auto& method_iter : iface->GetDeclaredVirtualMethods(pointer_size)) {
582 ArtMethod* current_method = &method_iter;
583 if (current_method->HasSameNameAndSignature(method)) {
584 if (current_method->IsDefault()) {
585 // Handle JLS soft errors, a default method from another superinterface tree can
586 // "override" an abstract method(s) from another superinterface tree(s). To do this,
587 // ignore any [default] method which are dominated by the abstract methods we've seen so
588 // far. Check if overridden by any in abstract_methods. We do not need to check for
589 // default_conflicts because we would hit those before we get to this loop.
590 bool overridden = false;
591 for (ArtMethod* possible_override : abstract_methods) {
592 DCHECK(possible_override->HasSameNameAndSignature(current_method));
593 if (iface->IsAssignableFrom(possible_override->GetDeclaringClass())) {
594 overridden = true;
595 break;
596 }
597 }
598 if (!overridden) {
599 return current_method;
600 }
601 } else {
602 // Is not default.
603 // This might override another default method. Just stash it for now.
604 abstract_methods.push_back(current_method);
605 }
606 }
607 }
608 }
609 // If we reach here we either never found any declaration of the method (in which case
610 // 'abstract_methods' is empty or we found no non-overriden default methods in which case
611 // 'abstract_methods' contains a number of abstract implementations of the methods. We choose one
612 // of these arbitrarily.
613 return abstract_methods.empty() ? nullptr : abstract_methods[0];
614 }
615
FindClassInitializer(size_t pointer_size)616 ArtMethod* Class::FindClassInitializer(size_t pointer_size) {
617 for (ArtMethod& method : GetDirectMethods(pointer_size)) {
618 if (method.IsClassInitializer()) {
619 DCHECK_STREQ(method.GetName(), "<clinit>");
620 DCHECK_STREQ(method.GetSignature().ToString().c_str(), "()V");
621 return &method;
622 }
623 }
624 return nullptr;
625 }
626
627 // Custom binary search to avoid double comparisons from std::binary_search.
FindFieldByNameAndType(LengthPrefixedArray<ArtField> * fields,const StringPiece & name,const StringPiece & type)628 static ArtField* FindFieldByNameAndType(LengthPrefixedArray<ArtField>* fields,
629 const StringPiece& name,
630 const StringPiece& type)
631 SHARED_REQUIRES(Locks::mutator_lock_) {
632 if (fields == nullptr) {
633 return nullptr;
634 }
635 size_t low = 0;
636 size_t high = fields->size();
637 ArtField* ret = nullptr;
638 while (low < high) {
639 size_t mid = (low + high) / 2;
640 ArtField& field = fields->At(mid);
641 // Fields are sorted by class, then name, then type descriptor. This is verified in dex file
642 // verifier. There can be multiple fields with the same in the same class name due to proguard.
643 int result = StringPiece(field.GetName()).Compare(name);
644 if (result == 0) {
645 result = StringPiece(field.GetTypeDescriptor()).Compare(type);
646 }
647 if (result < 0) {
648 low = mid + 1;
649 } else if (result > 0) {
650 high = mid;
651 } else {
652 ret = &field;
653 break;
654 }
655 }
656 if (kIsDebugBuild) {
657 ArtField* found = nullptr;
658 for (ArtField& field : MakeIterationRangeFromLengthPrefixedArray(fields)) {
659 if (name == field.GetName() && type == field.GetTypeDescriptor()) {
660 found = &field;
661 break;
662 }
663 }
664 CHECK_EQ(found, ret) << "Found " << PrettyField(found) << " vs " << PrettyField(ret);
665 }
666 return ret;
667 }
668
FindDeclaredInstanceField(const StringPiece & name,const StringPiece & type)669 ArtField* Class::FindDeclaredInstanceField(const StringPiece& name, const StringPiece& type) {
670 // Binary search by name. Interfaces are not relevant because they can't contain instance fields.
671 return FindFieldByNameAndType(GetIFieldsPtr(), name, type);
672 }
673
FindDeclaredInstanceField(const DexCache * dex_cache,uint32_t dex_field_idx)674 ArtField* Class::FindDeclaredInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) {
675 if (GetDexCache() == dex_cache) {
676 for (ArtField& field : GetIFields()) {
677 if (field.GetDexFieldIndex() == dex_field_idx) {
678 return &field;
679 }
680 }
681 }
682 return nullptr;
683 }
684
FindInstanceField(const StringPiece & name,const StringPiece & type)685 ArtField* Class::FindInstanceField(const StringPiece& name, const StringPiece& type) {
686 // Is the field in this class, or any of its superclasses?
687 // Interfaces are not relevant because they can't contain instance fields.
688 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) {
689 ArtField* f = c->FindDeclaredInstanceField(name, type);
690 if (f != nullptr) {
691 return f;
692 }
693 }
694 return nullptr;
695 }
696
FindInstanceField(const DexCache * dex_cache,uint32_t dex_field_idx)697 ArtField* Class::FindInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) {
698 // Is the field in this class, or any of its superclasses?
699 // Interfaces are not relevant because they can't contain instance fields.
700 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) {
701 ArtField* f = c->FindDeclaredInstanceField(dex_cache, dex_field_idx);
702 if (f != nullptr) {
703 return f;
704 }
705 }
706 return nullptr;
707 }
708
FindDeclaredStaticField(const StringPiece & name,const StringPiece & type)709 ArtField* Class::FindDeclaredStaticField(const StringPiece& name, const StringPiece& type) {
710 DCHECK(type != nullptr);
711 return FindFieldByNameAndType(GetSFieldsPtr(), name, type);
712 }
713
FindDeclaredStaticField(const DexCache * dex_cache,uint32_t dex_field_idx)714 ArtField* Class::FindDeclaredStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) {
715 if (dex_cache == GetDexCache()) {
716 for (ArtField& field : GetSFields()) {
717 if (field.GetDexFieldIndex() == dex_field_idx) {
718 return &field;
719 }
720 }
721 }
722 return nullptr;
723 }
724
FindStaticField(Thread * self,Handle<Class> klass,const StringPiece & name,const StringPiece & type)725 ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const StringPiece& name,
726 const StringPiece& type) {
727 // Is the field in this class (or its interfaces), or any of its
728 // superclasses (or their interfaces)?
729 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) {
730 // Is the field in this class?
731 ArtField* f = k->FindDeclaredStaticField(name, type);
732 if (f != nullptr) {
733 return f;
734 }
735 // Wrap k incase it moves during GetDirectInterface.
736 StackHandleScope<1> hs(self);
737 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k));
738 // Is this field in any of this class' interfaces?
739 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) {
740 StackHandleScope<1> hs2(self);
741 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i)));
742 f = FindStaticField(self, interface, name, type);
743 if (f != nullptr) {
744 return f;
745 }
746 }
747 }
748 return nullptr;
749 }
750
FindStaticField(Thread * self,Handle<Class> klass,const DexCache * dex_cache,uint32_t dex_field_idx)751 ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const DexCache* dex_cache,
752 uint32_t dex_field_idx) {
753 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) {
754 // Is the field in this class?
755 ArtField* f = k->FindDeclaredStaticField(dex_cache, dex_field_idx);
756 if (f != nullptr) {
757 return f;
758 }
759 // Wrap k incase it moves during GetDirectInterface.
760 StackHandleScope<1> hs(self);
761 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k));
762 // Is this field in any of this class' interfaces?
763 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) {
764 StackHandleScope<1> hs2(self);
765 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i)));
766 f = FindStaticField(self, interface, dex_cache, dex_field_idx);
767 if (f != nullptr) {
768 return f;
769 }
770 }
771 }
772 return nullptr;
773 }
774
FindField(Thread * self,Handle<Class> klass,const StringPiece & name,const StringPiece & type)775 ArtField* Class::FindField(Thread* self, Handle<Class> klass, const StringPiece& name,
776 const StringPiece& type) {
777 // Find a field using the JLS field resolution order
778 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) {
779 // Is the field in this class?
780 ArtField* f = k->FindDeclaredInstanceField(name, type);
781 if (f != nullptr) {
782 return f;
783 }
784 f = k->FindDeclaredStaticField(name, type);
785 if (f != nullptr) {
786 return f;
787 }
788 // Is this field in any of this class' interfaces?
789 StackHandleScope<1> hs(self);
790 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k));
791 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) {
792 StackHandleScope<1> hs2(self);
793 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i)));
794 f = interface->FindStaticField(self, interface, name, type);
795 if (f != nullptr) {
796 return f;
797 }
798 }
799 }
800 return nullptr;
801 }
802
SetSkipAccessChecksFlagOnAllMethods(size_t pointer_size)803 void Class::SetSkipAccessChecksFlagOnAllMethods(size_t pointer_size) {
804 DCHECK(IsVerified());
805 for (auto& m : GetMethods(pointer_size)) {
806 if (!m.IsNative() && m.IsInvokable()) {
807 m.SetSkipAccessChecks();
808 }
809 }
810 }
811
GetDescriptor(std::string * storage)812 const char* Class::GetDescriptor(std::string* storage) {
813 if (IsPrimitive()) {
814 return Primitive::Descriptor(GetPrimitiveType());
815 } else if (IsArrayClass()) {
816 return GetArrayDescriptor(storage);
817 } else if (IsProxyClass()) {
818 *storage = Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this);
819 return storage->c_str();
820 } else {
821 const DexFile& dex_file = GetDexFile();
822 const DexFile::TypeId& type_id = dex_file.GetTypeId(GetClassDef()->class_idx_);
823 return dex_file.GetTypeDescriptor(type_id);
824 }
825 }
826
GetArrayDescriptor(std::string * storage)827 const char* Class::GetArrayDescriptor(std::string* storage) {
828 std::string temp;
829 const char* elem_desc = GetComponentType()->GetDescriptor(&temp);
830 *storage = "[";
831 *storage += elem_desc;
832 return storage->c_str();
833 }
834
GetClassDef()835 const DexFile::ClassDef* Class::GetClassDef() {
836 uint16_t class_def_idx = GetDexClassDefIndex();
837 if (class_def_idx == DexFile::kDexNoIndex16) {
838 return nullptr;
839 }
840 return &GetDexFile().GetClassDef(class_def_idx);
841 }
842
GetDirectInterfaceTypeIdx(uint32_t idx)843 uint16_t Class::GetDirectInterfaceTypeIdx(uint32_t idx) {
844 DCHECK(!IsPrimitive());
845 DCHECK(!IsArrayClass());
846 return GetInterfaceTypeList()->GetTypeItem(idx).type_idx_;
847 }
848
GetDirectInterface(Thread * self,Handle<mirror::Class> klass,uint32_t idx)849 mirror::Class* Class::GetDirectInterface(Thread* self, Handle<mirror::Class> klass,
850 uint32_t idx) {
851 DCHECK(klass.Get() != nullptr);
852 DCHECK(!klass->IsPrimitive());
853 if (klass->IsArrayClass()) {
854 ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
855 if (idx == 0) {
856 return class_linker->FindSystemClass(self, "Ljava/lang/Cloneable;");
857 } else {
858 DCHECK_EQ(1U, idx);
859 return class_linker->FindSystemClass(self, "Ljava/io/Serializable;");
860 }
861 } else if (klass->IsProxyClass()) {
862 mirror::ObjectArray<mirror::Class>* interfaces = klass.Get()->GetInterfaces();
863 DCHECK(interfaces != nullptr);
864 return interfaces->Get(idx);
865 } else {
866 uint16_t type_idx = klass->GetDirectInterfaceTypeIdx(idx);
867 mirror::Class* interface = klass->GetDexCache()->GetResolvedType(type_idx);
868 if (interface == nullptr) {
869 interface = Runtime::Current()->GetClassLinker()->ResolveType(klass->GetDexFile(), type_idx,
870 klass.Get());
871 CHECK(interface != nullptr || self->IsExceptionPending());
872 }
873 return interface;
874 }
875 }
876
GetCommonSuperClass(Handle<Class> klass)877 mirror::Class* Class::GetCommonSuperClass(Handle<Class> klass) {
878 DCHECK(klass.Get() != nullptr);
879 DCHECK(!klass->IsInterface());
880 DCHECK(!IsInterface());
881 mirror::Class* common_super_class = this;
882 while (!common_super_class->IsAssignableFrom(klass.Get())) {
883 mirror::Class* old_common = common_super_class;
884 common_super_class = old_common->GetSuperClass();
885 DCHECK(common_super_class != nullptr) << PrettyClass(old_common);
886 }
887 return common_super_class;
888 }
889
GetSourceFile()890 const char* Class::GetSourceFile() {
891 const DexFile& dex_file = GetDexFile();
892 const DexFile::ClassDef* dex_class_def = GetClassDef();
893 if (dex_class_def == nullptr) {
894 // Generated classes have no class def.
895 return nullptr;
896 }
897 return dex_file.GetSourceFile(*dex_class_def);
898 }
899
GetLocation()900 std::string Class::GetLocation() {
901 mirror::DexCache* dex_cache = GetDexCache();
902 if (dex_cache != nullptr && !IsProxyClass()) {
903 return dex_cache->GetLocation()->ToModifiedUtf8();
904 }
905 // Arrays and proxies are generated and have no corresponding dex file location.
906 return "generated class";
907 }
908
GetInterfaceTypeList()909 const DexFile::TypeList* Class::GetInterfaceTypeList() {
910 const DexFile::ClassDef* class_def = GetClassDef();
911 if (class_def == nullptr) {
912 return nullptr;
913 }
914 return GetDexFile().GetInterfacesList(*class_def);
915 }
916
PopulateEmbeddedImtAndVTable(ArtMethod * const (& methods)[kImtSize],size_t pointer_size)917 void Class::PopulateEmbeddedImtAndVTable(ArtMethod* const (&methods)[kImtSize],
918 size_t pointer_size) {
919 for (size_t i = 0; i < kImtSize; i++) {
920 auto method = methods[i];
921 DCHECK(method != nullptr);
922 SetEmbeddedImTableEntry(i, method, pointer_size);
923 }
924 PointerArray* table = GetVTableDuringLinking();
925 CHECK(table != nullptr) << PrettyClass(this);
926 const size_t table_length = table->GetLength();
927 SetEmbeddedVTableLength(table_length);
928 for (size_t i = 0; i < table_length; i++) {
929 SetEmbeddedVTableEntry(i, table->GetElementPtrSize<ArtMethod*>(i, pointer_size), pointer_size);
930 }
931 // Keep java.lang.Object class's vtable around for since it's easier
932 // to be reused by array classes during their linking.
933 if (!IsObjectClass()) {
934 SetVTable(nullptr);
935 }
936 }
937
938 class ReadBarrierOnNativeRootsVisitor {
939 public:
operator ()(mirror::Object * obj ATTRIBUTE_UNUSED,MemberOffset offset ATTRIBUTE_UNUSED,bool is_static ATTRIBUTE_UNUSED) const940 void operator()(mirror::Object* obj ATTRIBUTE_UNUSED,
941 MemberOffset offset ATTRIBUTE_UNUSED,
942 bool is_static ATTRIBUTE_UNUSED) const {}
943
VisitRootIfNonNull(mirror::CompressedReference<mirror::Object> * root) const944 void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const
945 SHARED_REQUIRES(Locks::mutator_lock_) {
946 if (!root->IsNull()) {
947 VisitRoot(root);
948 }
949 }
950
VisitRoot(mirror::CompressedReference<mirror::Object> * root) const951 void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const
952 SHARED_REQUIRES(Locks::mutator_lock_) {
953 mirror::Object* old_ref = root->AsMirrorPtr();
954 mirror::Object* new_ref = ReadBarrier::BarrierForRoot(root);
955 if (old_ref != new_ref) {
956 // Update the field atomically. This may fail if mutator updates before us, but it's ok.
957 auto* atomic_root =
958 reinterpret_cast<Atomic<mirror::CompressedReference<mirror::Object>>*>(root);
959 atomic_root->CompareExchangeStrongSequentiallyConsistent(
960 mirror::CompressedReference<mirror::Object>::FromMirrorPtr(old_ref),
961 mirror::CompressedReference<mirror::Object>::FromMirrorPtr(new_ref));
962 }
963 }
964 };
965
966 // The pre-fence visitor for Class::CopyOf().
967 class CopyClassVisitor {
968 public:
CopyClassVisitor(Thread * self,Handle<mirror::Class> * orig,size_t new_length,size_t copy_bytes,ArtMethod * const (& imt)[mirror::Class::kImtSize],size_t pointer_size)969 CopyClassVisitor(Thread* self, Handle<mirror::Class>* orig, size_t new_length,
970 size_t copy_bytes, ArtMethod* const (&imt)[mirror::Class::kImtSize],
971 size_t pointer_size)
972 : self_(self), orig_(orig), new_length_(new_length),
973 copy_bytes_(copy_bytes), imt_(imt), pointer_size_(pointer_size) {
974 }
975
operator ()(mirror::Object * obj,size_t usable_size ATTRIBUTE_UNUSED) const976 void operator()(mirror::Object* obj, size_t usable_size ATTRIBUTE_UNUSED) const
977 SHARED_REQUIRES(Locks::mutator_lock_) {
978 StackHandleScope<1> hs(self_);
979 Handle<mirror::Class> h_new_class_obj(hs.NewHandle(obj->AsClass()));
980 mirror::Object::CopyObject(self_, h_new_class_obj.Get(), orig_->Get(), copy_bytes_);
981 mirror::Class::SetStatus(h_new_class_obj, Class::kStatusResolving, self_);
982 h_new_class_obj->PopulateEmbeddedImtAndVTable(imt_, pointer_size_);
983 h_new_class_obj->SetClassSize(new_length_);
984 // Visit all of the references to make sure there is no from space references in the native
985 // roots.
986 static_cast<mirror::Object*>(h_new_class_obj.Get())->VisitReferences(
987 ReadBarrierOnNativeRootsVisitor(), VoidFunctor());
988 }
989
990 private:
991 Thread* const self_;
992 Handle<mirror::Class>* const orig_;
993 const size_t new_length_;
994 const size_t copy_bytes_;
995 ArtMethod* const (&imt_)[mirror::Class::kImtSize];
996 const size_t pointer_size_;
997 DISALLOW_COPY_AND_ASSIGN(CopyClassVisitor);
998 };
999
CopyOf(Thread * self,int32_t new_length,ArtMethod * const (& imt)[mirror::Class::kImtSize],size_t pointer_size)1000 Class* Class::CopyOf(Thread* self, int32_t new_length,
1001 ArtMethod* const (&imt)[mirror::Class::kImtSize], size_t pointer_size) {
1002 DCHECK_GE(new_length, static_cast<int32_t>(sizeof(Class)));
1003 // We may get copied by a compacting GC.
1004 StackHandleScope<1> hs(self);
1005 Handle<mirror::Class> h_this(hs.NewHandle(this));
1006 gc::Heap* heap = Runtime::Current()->GetHeap();
1007 // The num_bytes (3rd param) is sizeof(Class) as opposed to SizeOf()
1008 // to skip copying the tail part that we will overwrite here.
1009 CopyClassVisitor visitor(self, &h_this, new_length, sizeof(Class), imt, pointer_size);
1010 mirror::Object* new_class = kMovingClasses ?
1011 heap->AllocObject<true>(self, java_lang_Class_.Read(), new_length, visitor) :
1012 heap->AllocNonMovableObject<true>(self, java_lang_Class_.Read(), new_length, visitor);
1013 if (UNLIKELY(new_class == nullptr)) {
1014 self->AssertPendingOOMException();
1015 return nullptr;
1016 }
1017 return new_class->AsClass();
1018 }
1019
ProxyDescriptorEquals(const char * match)1020 bool Class::ProxyDescriptorEquals(const char* match) {
1021 DCHECK(IsProxyClass());
1022 return Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this) == match;
1023 }
1024
1025 // TODO: Move this to java_lang_Class.cc?
GetDeclaredConstructor(Thread * self,Handle<mirror::ObjectArray<mirror::Class>> args,size_t pointer_size)1026 ArtMethod* Class::GetDeclaredConstructor(
1027 Thread* self, Handle<mirror::ObjectArray<mirror::Class>> args, size_t pointer_size) {
1028 for (auto& m : GetDirectMethods(pointer_size)) {
1029 // Skip <clinit> which is a static constructor, as well as non constructors.
1030 if (m.IsStatic() || !m.IsConstructor()) {
1031 continue;
1032 }
1033 // May cause thread suspension and exceptions.
1034 if (m.GetInterfaceMethodIfProxy(sizeof(void*))->EqualParameters(args)) {
1035 return &m;
1036 }
1037 if (UNLIKELY(self->IsExceptionPending())) {
1038 return nullptr;
1039 }
1040 }
1041 return nullptr;
1042 }
1043
Depth()1044 uint32_t Class::Depth() {
1045 uint32_t depth = 0;
1046 for (Class* klass = this; klass->GetSuperClass() != nullptr; klass = klass->GetSuperClass()) {
1047 depth++;
1048 }
1049 return depth;
1050 }
1051
FindTypeIndexInOtherDexFile(const DexFile & dex_file)1052 uint32_t Class::FindTypeIndexInOtherDexFile(const DexFile& dex_file) {
1053 std::string temp;
1054 const DexFile::TypeId* type_id = dex_file.FindTypeId(GetDescriptor(&temp));
1055 return (type_id == nullptr) ? DexFile::kDexNoIndex : dex_file.GetIndexForTypeId(*type_id);
1056 }
1057
1058 template <bool kTransactionActive>
GetDeclaredMethodInternal(Thread * self,mirror::Class * klass,mirror::String * name,mirror::ObjectArray<mirror::Class> * args)1059 mirror::Method* Class::GetDeclaredMethodInternal(Thread* self,
1060 mirror::Class* klass,
1061 mirror::String* name,
1062 mirror::ObjectArray<mirror::Class>* args) {
1063 // Covariant return types permit the class to define multiple
1064 // methods with the same name and parameter types. Prefer to
1065 // return a non-synthetic method in such situations. We may
1066 // still return a synthetic method to handle situations like
1067 // escalated visibility. We never return miranda methods that
1068 // were synthesized by the runtime.
1069 constexpr uint32_t kSkipModifiers = kAccMiranda | kAccSynthetic;
1070 StackHandleScope<3> hs(self);
1071 auto h_method_name = hs.NewHandle(name);
1072 if (UNLIKELY(h_method_name.Get() == nullptr)) {
1073 ThrowNullPointerException("name == null");
1074 return nullptr;
1075 }
1076 auto h_args = hs.NewHandle(args);
1077 Handle<mirror::Class> h_klass = hs.NewHandle(klass);
1078 ArtMethod* result = nullptr;
1079 const size_t pointer_size = kTransactionActive
1080 ? Runtime::Current()->GetClassLinker()->GetImagePointerSize()
1081 : sizeof(void*);
1082 for (auto& m : h_klass->GetDeclaredVirtualMethods(pointer_size)) {
1083 auto* np_method = m.GetInterfaceMethodIfProxy(pointer_size);
1084 // May cause thread suspension.
1085 mirror::String* np_name = np_method->GetNameAsString(self);
1086 if (!np_name->Equals(h_method_name.Get()) || !np_method->EqualParameters(h_args)) {
1087 if (UNLIKELY(self->IsExceptionPending())) {
1088 return nullptr;
1089 }
1090 continue;
1091 }
1092 auto modifiers = m.GetAccessFlags();
1093 if ((modifiers & kSkipModifiers) == 0) {
1094 return mirror::Method::CreateFromArtMethod<kTransactionActive>(self, &m);
1095 }
1096 if ((modifiers & kAccMiranda) == 0) {
1097 result = &m; // Remember as potential result if it's not a miranda method.
1098 }
1099 }
1100 if (result == nullptr) {
1101 for (auto& m : h_klass->GetDirectMethods(pointer_size)) {
1102 auto modifiers = m.GetAccessFlags();
1103 if ((modifiers & kAccConstructor) != 0) {
1104 continue;
1105 }
1106 auto* np_method = m.GetInterfaceMethodIfProxy(pointer_size);
1107 // May cause thread suspension.
1108 mirror::String* np_name = np_method->GetNameAsString(self);
1109 if (np_name == nullptr) {
1110 self->AssertPendingException();
1111 return nullptr;
1112 }
1113 if (!np_name->Equals(h_method_name.Get()) || !np_method->EqualParameters(h_args)) {
1114 if (UNLIKELY(self->IsExceptionPending())) {
1115 return nullptr;
1116 }
1117 continue;
1118 }
1119 if ((modifiers & kSkipModifiers) == 0) {
1120 return mirror::Method::CreateFromArtMethod<kTransactionActive>(self, &m);
1121 }
1122 // Direct methods cannot be miranda methods, so this potential result must be synthetic.
1123 result = &m;
1124 }
1125 }
1126 return result != nullptr
1127 ? mirror::Method::CreateFromArtMethod<kTransactionActive>(self, result)
1128 : nullptr;
1129 }
1130
1131 template
1132 mirror::Method* Class::GetDeclaredMethodInternal<false>(Thread* self,
1133 mirror::Class* klass,
1134 mirror::String* name,
1135 mirror::ObjectArray<mirror::Class>* args);
1136 template
1137 mirror::Method* Class::GetDeclaredMethodInternal<true>(Thread* self,
1138 mirror::Class* klass,
1139 mirror::String* name,
1140 mirror::ObjectArray<mirror::Class>* args);
1141
1142 template <bool kTransactionActive>
GetDeclaredConstructorInternal(Thread * self,mirror::Class * klass,mirror::ObjectArray<mirror::Class> * args)1143 mirror::Constructor* Class::GetDeclaredConstructorInternal(
1144 Thread* self,
1145 mirror::Class* klass,
1146 mirror::ObjectArray<mirror::Class>* args) {
1147 StackHandleScope<1> hs(self);
1148 const size_t pointer_size = kTransactionActive
1149 ? Runtime::Current()->GetClassLinker()->GetImagePointerSize()
1150 : sizeof(void*);
1151 ArtMethod* result = klass->GetDeclaredConstructor(self, hs.NewHandle(args), pointer_size);
1152 return result != nullptr
1153 ? mirror::Constructor::CreateFromArtMethod<kTransactionActive>(self, result)
1154 : nullptr;
1155 }
1156
1157 // mirror::Constructor::CreateFromArtMethod<kTransactionActive>(self, result)
1158
1159 template mirror::Constructor* Class::GetDeclaredConstructorInternal<false>(
1160 Thread* self,
1161 mirror::Class* klass,
1162 mirror::ObjectArray<mirror::Class>* args);
1163 template mirror::Constructor* Class::GetDeclaredConstructorInternal<true>(
1164 Thread* self,
1165 mirror::Class* klass,
1166 mirror::ObjectArray<mirror::Class>* args);
1167
GetInnerClassFlags(Handle<Class> h_this,int32_t default_value)1168 int32_t Class::GetInnerClassFlags(Handle<Class> h_this, int32_t default_value) {
1169 if (h_this->IsProxyClass() || h_this->GetDexCache() == nullptr) {
1170 return default_value;
1171 }
1172 uint32_t flags;
1173 if (!h_this->GetDexFile().GetInnerClassFlags(h_this, &flags)) {
1174 return default_value;
1175 }
1176 return flags;
1177 }
1178
1179 } // namespace mirror
1180 } // namespace art
1181