entrypoint_utils.h revision d4beb6bc2b42b176c6d04fdd91d6c758e542c7c2 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ART_RUNTIME_ENTRYPOINTS_ENTRYPOINT_UTILS_H_
18#define ART_RUNTIME_ENTRYPOINTS_ENTRYPOINT_UTILS_H_
19
20#include "base/macros.h"
21#include "class_linker.h"
22#include "common_throws.h"
23#include "dex_file.h"
24#include "indirect_reference_table.h"
25#include "invoke_type.h"
26#include "jni_internal.h"
27#include "mirror/art_method.h"
28#include "mirror/array.h"
29#include "mirror/class-inl.h"
30#include "mirror/throwable.h"
31#include "object_utils.h"
32
33#include "thread.h"
34
35namespace art {
36
37namespace mirror {
38  class Class;
39  class ArtField;
40  class Object;
41}  // namespace mirror
42
43static inline bool CheckObjectAlloc(uint32_t type_idx, mirror::ArtMethod* method,
44                                    Thread* self,
45                                    bool access_check,
46                                    mirror::Class** klass_ptr)
47    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
48  mirror::Class* klass = method->GetDexCacheResolvedTypes()->GetWithoutChecks(type_idx);
49  Runtime* runtime = Runtime::Current();
50  if (UNLIKELY(klass == NULL)) {
51    klass = runtime->GetClassLinker()->ResolveType(type_idx, method);
52    if (klass == NULL) {
53      DCHECK(self->IsExceptionPending());
54      return false;  // Failure
55    }
56  }
57  if (access_check) {
58    if (UNLIKELY(!klass->IsInstantiable())) {
59      ThrowLocation throw_location = self->GetCurrentLocationForThrow();
60      self->ThrowNewException(throw_location, "Ljava/lang/InstantiationError;",
61                              PrettyDescriptor(klass).c_str());
62      return false;  // Failure
63    }
64    mirror::Class* referrer = method->GetDeclaringClass();
65    if (UNLIKELY(!referrer->CanAccess(klass))) {
66      ThrowIllegalAccessErrorClass(referrer, klass);
67      return false;  // Failure
68    }
69  }
70  if (!klass->IsInitialized() &&
71      !runtime->GetClassLinker()->EnsureInitialized(klass, true, true)) {
72    DCHECK(self->IsExceptionPending());
73    return false;  // Failure
74  }
75  *klass_ptr = klass;
76  return true;
77}
78
79// Given the context of a calling Method, use its DexCache to resolve a type to a Class. If it
80// cannot be resolved, throw an error. If it can, use it to create an instance.
81// When verification/compiler hasn't been able to verify access, optionally perform an access
82// check.
83static inline mirror::Object* AllocObjectFromCode(uint32_t type_idx, mirror::ArtMethod* method,
84                                                  Thread* self,
85                                                  bool access_check)
86    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
87  mirror::Class* klass;
88  if (UNLIKELY(!CheckObjectAlloc(type_idx, method, self, access_check, &klass))) {
89    return NULL;
90  }
91  return klass->AllocObjectUninstrumented(self);
92}
93
94static inline mirror::Object* AllocObjectFromCodeInstrumented(uint32_t type_idx, mirror::ArtMethod* method,
95                                                              Thread* self,
96                                                              bool access_check)
97    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
98  mirror::Class* klass;
99  if (UNLIKELY(!CheckObjectAlloc(type_idx, method, self, access_check, &klass))) {
100    return NULL;
101  }
102  return klass->AllocObjectInstrumented(self);
103}
104
105static inline bool CheckArrayAlloc(uint32_t type_idx, mirror::ArtMethod* method,
106                                   int32_t component_count,
107                                   bool access_check, mirror::Class** klass_ptr)
108    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
109  if (UNLIKELY(component_count < 0)) {
110    ThrowNegativeArraySizeException(component_count);
111    return false;  // Failure
112  }
113  mirror::Class* klass = method->GetDexCacheResolvedTypes()->GetWithoutChecks(type_idx);
114  if (UNLIKELY(klass == NULL)) {  // Not in dex cache so try to resolve
115    klass = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, method);
116    if (klass == NULL) {  // Error
117      DCHECK(Thread::Current()->IsExceptionPending());
118      return false;  // Failure
119    }
120    CHECK(klass->IsArrayClass()) << PrettyClass(klass);
121  }
122  if (access_check) {
123    mirror::Class* referrer = method->GetDeclaringClass();
124    if (UNLIKELY(!referrer->CanAccess(klass))) {
125      ThrowIllegalAccessErrorClass(referrer, klass);
126      return false;  // Failure
127    }
128  }
129  *klass_ptr = klass;
130  return true;
131}
132
133// Given the context of a calling Method, use its DexCache to resolve a type to an array Class. If
134// it cannot be resolved, throw an error. If it can, use it to create an array.
135// When verification/compiler hasn't been able to verify access, optionally perform an access
136// check.
137static inline mirror::Array* AllocArrayFromCode(uint32_t type_idx, mirror::ArtMethod* method,
138                                                int32_t component_count,
139                                                Thread* self, bool access_check)
140    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
141  mirror::Class* klass;
142  if (UNLIKELY(!CheckArrayAlloc(type_idx, method, component_count, access_check, &klass))) {
143    return NULL;
144  }
145  return mirror::Array::AllocUninstrumented(self, klass, component_count);
146}
147
148static inline mirror::Array* AllocArrayFromCodeInstrumented(uint32_t type_idx, mirror::ArtMethod* method,
149                                                            int32_t component_count,
150                                                            Thread* self, bool access_check)
151    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
152  mirror::Class* klass;
153  if (UNLIKELY(!CheckArrayAlloc(type_idx, method, component_count, access_check, &klass))) {
154    return NULL;
155  }
156  return mirror::Array::AllocInstrumented(self, klass, component_count);
157}
158
159extern mirror::Array* CheckAndAllocArrayFromCode(uint32_t type_idx, mirror::ArtMethod* method,
160                                                 int32_t component_count,
161                                                 Thread* self, bool access_check)
162    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
163
164extern mirror::Array* CheckAndAllocArrayFromCodeInstrumented(uint32_t type_idx, mirror::ArtMethod* method,
165                                                             int32_t component_count,
166                                                             Thread* self, bool access_check)
167    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
168
169// Type of find field operation for fast and slow case.
170enum FindFieldType {
171  InstanceObjectRead,
172  InstanceObjectWrite,
173  InstancePrimitiveRead,
174  InstancePrimitiveWrite,
175  StaticObjectRead,
176  StaticObjectWrite,
177  StaticPrimitiveRead,
178  StaticPrimitiveWrite,
179};
180
181template<FindFieldType type, bool access_check>
182static inline mirror::ArtField* FindFieldFromCode(uint32_t field_idx, const mirror::ArtMethod* referrer,
183                                                  Thread* self, size_t expected_size) {
184  bool is_primitive;
185  bool is_set;
186  bool is_static;
187  switch (type) {
188    case InstanceObjectRead:     is_primitive = false; is_set = false; is_static = false; break;
189    case InstanceObjectWrite:    is_primitive = false; is_set = true;  is_static = false; break;
190    case InstancePrimitiveRead:  is_primitive = true;  is_set = false; is_static = false; break;
191    case InstancePrimitiveWrite: is_primitive = true;  is_set = true;  is_static = false; break;
192    case StaticObjectRead:       is_primitive = false; is_set = false; is_static = true;  break;
193    case StaticObjectWrite:      is_primitive = false; is_set = true;  is_static = true;  break;
194    case StaticPrimitiveRead:    is_primitive = true;  is_set = false; is_static = true;  break;
195    case StaticPrimitiveWrite:   // Keep GCC happy by having a default handler, fall-through.
196    default:                     is_primitive = true;  is_set = true;  is_static = true;  break;
197  }
198  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
199  mirror::ArtField* resolved_field = class_linker->ResolveField(field_idx, referrer, is_static);
200  if (UNLIKELY(resolved_field == nullptr)) {
201    DCHECK(self->IsExceptionPending());  // Throw exception and unwind.
202    return nullptr;  // Failure.
203  }
204  mirror::Class* fields_class = resolved_field->GetDeclaringClass();
205  if (access_check) {
206    if (UNLIKELY(resolved_field->IsStatic() != is_static)) {
207      ThrowIncompatibleClassChangeErrorField(resolved_field, is_static, referrer);
208      return nullptr;
209    }
210    mirror::Class* referring_class = referrer->GetDeclaringClass();
211    if (UNLIKELY(!referring_class->CanAccess(fields_class) ||
212                 !referring_class->CanAccessMember(fields_class,
213                                                   resolved_field->GetAccessFlags()))) {
214      // The referring class can't access the resolved field, this may occur as a result of a
215      // protected field being made public by a sub-class. Resort to the dex file to determine
216      // the correct class for the access check.
217      const DexFile& dex_file = *referring_class->GetDexCache()->GetDexFile();
218      fields_class = class_linker->ResolveType(dex_file,
219                                               dex_file.GetFieldId(field_idx).class_idx_,
220                                               referring_class);
221      if (UNLIKELY(!referring_class->CanAccess(fields_class))) {
222        ThrowIllegalAccessErrorClass(referring_class, fields_class);
223        return nullptr;  // failure
224      } else if (UNLIKELY(!referring_class->CanAccessMember(fields_class,
225                                                            resolved_field->GetAccessFlags()))) {
226        ThrowIllegalAccessErrorField(referring_class, resolved_field);
227        return nullptr;  // failure
228      }
229    }
230    if (UNLIKELY(is_set && resolved_field->IsFinal() && (fields_class != referring_class))) {
231      ThrowIllegalAccessErrorFinalField(referrer, resolved_field);
232      return nullptr;  // failure
233    } else {
234      FieldHelper fh(resolved_field);
235      if (UNLIKELY(fh.IsPrimitiveType() != is_primitive ||
236                   fh.FieldSize() != expected_size)) {
237        ThrowLocation throw_location = self->GetCurrentLocationForThrow();
238        DCHECK(throw_location.GetMethod() == referrer);
239        self->ThrowNewExceptionF(throw_location, "Ljava/lang/NoSuchFieldError;",
240                                 "Attempted read of %zd-bit %s on field '%s'",
241                                 expected_size * (32 / sizeof(int32_t)),
242                                 is_primitive ? "primitive" : "non-primitive",
243                                 PrettyField(resolved_field, true).c_str());
244        return nullptr;  // failure
245      }
246    }
247  }
248  if (!is_static) {
249    // instance fields must be being accessed on an initialized class
250    return resolved_field;
251  } else {
252    // If the class is initialized we're done.
253    if (LIKELY(fields_class->IsInitialized())) {
254      return resolved_field;
255    } else if (LIKELY(class_linker->EnsureInitialized(fields_class, true, true))) {
256      // Otherwise let's ensure the class is initialized before resolving the field.
257      return resolved_field;
258    } else {
259      DCHECK(self->IsExceptionPending());  // Throw exception and unwind
260      return nullptr;  // failure
261    }
262  }
263}
264
265// Explicit template declarations of FindFieldFromCode for all field access types.
266#define EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL(_type, _access_check) \
267template SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) ALWAYS_INLINE \
268static mirror::ArtField* FindFieldFromCode<_type, _access_check>(uint32_t field_idx, \
269                                                                 const mirror::ArtMethod* referrer, \
270                                                                 Thread* self, size_t expected_size) \
271
272#define EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(_type) \
273    EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL(_type, false); \
274    EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL(_type, true)
275
276EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstanceObjectRead);
277EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstanceObjectWrite);
278EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstancePrimitiveRead);
279EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstancePrimitiveWrite);
280EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticObjectRead);
281EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticObjectWrite);
282EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticPrimitiveRead);
283EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticPrimitiveWrite);
284
285#undef EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL
286#undef EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL
287
288template<InvokeType type, bool access_check>
289static inline mirror::ArtMethod* FindMethodFromCode(uint32_t method_idx, mirror::Object* this_object,
290                                                    mirror::ArtMethod* referrer, Thread* self) {
291  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
292  mirror::ArtMethod* resolved_method = class_linker->ResolveMethod(method_idx, referrer, type);
293  if (UNLIKELY(resolved_method == nullptr)) {
294    DCHECK(self->IsExceptionPending());  // Throw exception and unwind.
295    return nullptr;  // Failure.
296  } else if (UNLIKELY(this_object == nullptr && type != kStatic)) {
297    // Maintain interpreter-like semantics where NullPointerException is thrown
298    // after potential NoSuchMethodError from class linker.
299    ThrowLocation throw_location = self->GetCurrentLocationForThrow();
300    DCHECK(referrer == throw_location.GetMethod());
301    ThrowNullPointerExceptionForMethodAccess(throw_location, method_idx, type);
302    return nullptr;  // Failure.
303  } else if (access_check) {
304    // Incompatible class change should have been handled in resolve method.
305    if (UNLIKELY(resolved_method->CheckIncompatibleClassChange(type))) {
306      ThrowIncompatibleClassChangeError(type, resolved_method->GetInvokeType(), resolved_method,
307                                        referrer);
308      return nullptr;  // Failure.
309    }
310    mirror::Class* methods_class = resolved_method->GetDeclaringClass();
311    mirror::Class* referring_class = referrer->GetDeclaringClass();
312    if (UNLIKELY(!referring_class->CanAccess(methods_class) ||
313                 !referring_class->CanAccessMember(methods_class,
314                                                   resolved_method->GetAccessFlags()))) {
315      // The referring class can't access the resolved method, this may occur as a result of a
316      // protected method being made public by implementing an interface that re-declares the
317      // method public. Resort to the dex file to determine the correct class for the access check
318      const DexFile& dex_file = *referring_class->GetDexCache()->GetDexFile();
319      ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
320      methods_class = class_linker->ResolveType(dex_file,
321                                                dex_file.GetMethodId(method_idx).class_idx_,
322                                                referring_class);
323      if (UNLIKELY(!referring_class->CanAccess(methods_class))) {
324        ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class,
325                                                      referrer, resolved_method, type);
326        return nullptr;  // Failure.
327      } else if (UNLIKELY(!referring_class->CanAccessMember(methods_class,
328                                                            resolved_method->GetAccessFlags()))) {
329        ThrowIllegalAccessErrorMethod(referring_class, resolved_method);
330        return nullptr;  // Failure.
331      }
332    }
333  }
334  switch (type) {
335    case kStatic:
336    case kDirect:
337      return resolved_method;
338    case kVirtual: {
339      mirror::ObjectArray<mirror::ArtMethod>* vtable = this_object->GetClass()->GetVTable();
340      uint16_t vtable_index = resolved_method->GetMethodIndex();
341      if (access_check &&
342          (vtable == nullptr || vtable_index >= static_cast<uint32_t>(vtable->GetLength()))) {
343        // Behavior to agree with that of the verifier.
344        MethodHelper mh(resolved_method);
345        ThrowNoSuchMethodError(type, resolved_method->GetDeclaringClass(), mh.GetName(),
346                               mh.GetSignature());
347        return nullptr;  // Failure.
348      }
349      DCHECK(vtable != nullptr);
350      return vtable->GetWithoutChecks(vtable_index);
351    }
352    case kSuper: {
353      mirror::Class* super_class = referrer->GetDeclaringClass()->GetSuperClass();
354      uint16_t vtable_index = resolved_method->GetMethodIndex();
355      mirror::ObjectArray<mirror::ArtMethod>* vtable;
356      if (access_check) {
357        // Check existence of super class.
358        vtable = (super_class != nullptr) ? super_class->GetVTable() : nullptr;
359        if (vtable == nullptr || vtable_index >= static_cast<uint32_t>(vtable->GetLength())) {
360          // Behavior to agree with that of the verifier.
361          MethodHelper mh(resolved_method);
362          ThrowNoSuchMethodError(type, resolved_method->GetDeclaringClass(), mh.GetName(),
363                                 mh.GetSignature());
364          return nullptr;  // Failure.
365        }
366      } else {
367        // Super class must exist.
368        DCHECK(super_class != nullptr);
369        vtable = super_class->GetVTable();
370      }
371      DCHECK(vtable != nullptr);
372      return vtable->GetWithoutChecks(vtable_index);
373    }
374    case kInterface: {
375      mirror::ArtMethod* interface_method =
376          this_object->GetClass()->FindVirtualMethodForInterface(resolved_method);
377      if (UNLIKELY(interface_method == nullptr)) {
378        ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(resolved_method, this_object,
379                                                                   referrer);
380        return nullptr;  // Failure.
381      } else {
382        return interface_method;
383      }
384    }
385    default:
386      LOG(FATAL) << "Unknown invoke type " << type;
387      return nullptr;  // Failure.
388  }
389}
390
391// Explicit template declarations of FindMethodFromCode for all invoke types.
392#define EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL(_type, _access_check)                        \
393  template SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) ALWAYS_INLINE                              \
394  static mirror::ArtMethod* FindMethodFromCode<_type, _access_check>(uint32_t method_idx,         \
395                                                                     mirror::Object* this_object, \
396                                                                     mirror::ArtMethod* referrer, \
397                                                                     Thread* self)
398#define EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(_type) \
399    EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL(_type, false);   \
400    EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL(_type, true)
401
402EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kStatic);
403EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kDirect);
404EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kVirtual);
405EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kSuper);
406EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kInterface);
407
408#undef EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL
409#undef EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL
410
411// Fast path field resolution that can't initialize classes or throw exceptions.
412static inline mirror::ArtField* FindFieldFast(uint32_t field_idx,
413                                              const mirror::ArtMethod* referrer,
414                                              FindFieldType type, size_t expected_size)
415    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
416  mirror::ArtField* resolved_field =
417      referrer->GetDeclaringClass()->GetDexCache()->GetResolvedField(field_idx);
418  if (UNLIKELY(resolved_field == NULL)) {
419    return NULL;
420  }
421  mirror::Class* fields_class = resolved_field->GetDeclaringClass();
422  // Check class is initiliazed or initializing.
423  if (UNLIKELY(!fields_class->IsInitializing())) {
424    return NULL;
425  }
426  // Check for incompatible class change.
427  bool is_primitive;
428  bool is_set;
429  bool is_static;
430  switch (type) {
431    case InstanceObjectRead:     is_primitive = false; is_set = false; is_static = false; break;
432    case InstanceObjectWrite:    is_primitive = false; is_set = true;  is_static = false; break;
433    case InstancePrimitiveRead:  is_primitive = true;  is_set = false; is_static = false; break;
434    case InstancePrimitiveWrite: is_primitive = true;  is_set = true;  is_static = false; break;
435    case StaticObjectRead:       is_primitive = false; is_set = false; is_static = true;  break;
436    case StaticObjectWrite:      is_primitive = false; is_set = true;  is_static = true;  break;
437    case StaticPrimitiveRead:    is_primitive = true;  is_set = false; is_static = true;  break;
438    case StaticPrimitiveWrite:   is_primitive = true;  is_set = true;  is_static = true;  break;
439    default:
440      LOG(FATAL) << "UNREACHABLE";  // Assignment below to avoid GCC warnings.
441      is_primitive = true;
442      is_set = true;
443      is_static = true;
444      break;
445  }
446  if (UNLIKELY(resolved_field->IsStatic() != is_static)) {
447    // Incompatible class change.
448    return NULL;
449  }
450  mirror::Class* referring_class = referrer->GetDeclaringClass();
451  if (UNLIKELY(!referring_class->CanAccess(fields_class) ||
452               !referring_class->CanAccessMember(fields_class,
453                                                 resolved_field->GetAccessFlags()) ||
454               (is_set && resolved_field->IsFinal() && (fields_class != referring_class)))) {
455    // Illegal access.
456    return NULL;
457  }
458  FieldHelper fh(resolved_field);
459  if (UNLIKELY(fh.IsPrimitiveType() != is_primitive ||
460               fh.FieldSize() != expected_size)) {
461    return NULL;
462  }
463  return resolved_field;
464}
465
466// Fast path method resolution that can't throw exceptions.
467static inline mirror::ArtMethod* FindMethodFast(uint32_t method_idx,
468                                                mirror::Object* this_object,
469                                                const mirror::ArtMethod* referrer,
470                                                bool access_check, InvokeType type)
471    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
472  bool is_direct = type == kStatic || type == kDirect;
473  if (UNLIKELY(this_object == NULL && !is_direct)) {
474    return NULL;
475  }
476  mirror::ArtMethod* resolved_method =
477      referrer->GetDeclaringClass()->GetDexCache()->GetResolvedMethod(method_idx);
478  if (UNLIKELY(resolved_method == NULL)) {
479    return NULL;
480  }
481  if (access_check) {
482    // Check for incompatible class change errors and access.
483    bool icce = resolved_method->CheckIncompatibleClassChange(type);
484    if (UNLIKELY(icce)) {
485      return NULL;
486    }
487    mirror::Class* methods_class = resolved_method->GetDeclaringClass();
488    mirror::Class* referring_class = referrer->GetDeclaringClass();
489    if (UNLIKELY(!referring_class->CanAccess(methods_class) ||
490                 !referring_class->CanAccessMember(methods_class,
491                                                   resolved_method->GetAccessFlags()))) {
492      // Potential illegal access, may need to refine the method's class.
493      return NULL;
494    }
495  }
496  if (type == kInterface) {  // Most common form of slow path dispatch.
497    return this_object->GetClass()->FindVirtualMethodForInterface(resolved_method);
498  } else if (is_direct) {
499    return resolved_method;
500  } else if (type == kSuper) {
501    return referrer->GetDeclaringClass()->GetSuperClass()->GetVTable()->
502        Get(resolved_method->GetMethodIndex());
503  } else {
504    DCHECK(type == kVirtual);
505    return this_object->GetClass()->GetVTable()->Get(resolved_method->GetMethodIndex());
506  }
507}
508
509static inline mirror::Class* ResolveVerifyAndClinit(uint32_t type_idx,
510                                                    const mirror::ArtMethod* referrer,
511                                                    Thread* self, bool can_run_clinit,
512                                                    bool verify_access)
513    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
514  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
515  mirror::Class* klass = class_linker->ResolveType(type_idx, referrer);
516  if (UNLIKELY(klass == NULL)) {
517    CHECK(self->IsExceptionPending());
518    return NULL;  // Failure - Indicate to caller to deliver exception
519  }
520  // Perform access check if necessary.
521  mirror::Class* referring_class = referrer->GetDeclaringClass();
522  if (verify_access && UNLIKELY(!referring_class->CanAccess(klass))) {
523    ThrowIllegalAccessErrorClass(referring_class, klass);
524    return NULL;  // Failure - Indicate to caller to deliver exception
525  }
526  // If we're just implementing const-class, we shouldn't call <clinit>.
527  if (!can_run_clinit) {
528    return klass;
529  }
530  // If we are the <clinit> of this class, just return our storage.
531  //
532  // Do not set the DexCache InitializedStaticStorage, since that implies <clinit> has finished
533  // running.
534  if (klass == referring_class && referrer->IsConstructor() && referrer->IsStatic()) {
535    return klass;
536  }
537  if (!class_linker->EnsureInitialized(klass, true, true)) {
538    CHECK(self->IsExceptionPending());
539    return NULL;  // Failure - Indicate to caller to deliver exception
540  }
541  referrer->GetDexCacheInitializedStaticStorage()->Set(type_idx, klass);
542  return klass;
543}
544
545extern void ThrowStackOverflowError(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
546
547static inline mirror::String* ResolveStringFromCode(const mirror::ArtMethod* referrer,
548                                                    uint32_t string_idx)
549    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
550  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
551  return class_linker->ResolveString(string_idx, referrer);
552}
553
554static inline void UnlockJniSynchronizedMethod(jobject locked, Thread* self)
555    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
556    UNLOCK_FUNCTION(monitor_lock_) {
557  // Save any pending exception over monitor exit call.
558  mirror::Throwable* saved_exception = NULL;
559  ThrowLocation saved_throw_location;
560  if (UNLIKELY(self->IsExceptionPending())) {
561    saved_exception = self->GetException(&saved_throw_location);
562    self->ClearException();
563  }
564  // Decode locked object and unlock, before popping local references.
565  self->DecodeJObject(locked)->MonitorExit(self);
566  if (UNLIKELY(self->IsExceptionPending())) {
567    LOG(FATAL) << "Synchronized JNI code returning with an exception:\n"
568        << saved_exception->Dump()
569        << "\nEncountered second exception during implicit MonitorExit:\n"
570        << self->GetException(NULL)->Dump();
571  }
572  // Restore pending exception.
573  if (saved_exception != NULL) {
574    self->SetException(saved_throw_location, saved_exception);
575  }
576}
577
578static inline void CheckReferenceResult(mirror::Object* o, Thread* self)
579    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
580  if (o == NULL) {
581    return;
582  }
583  mirror::ArtMethod* m = self->GetCurrentMethod(NULL);
584  if (o == kInvalidIndirectRefObject) {
585    JniAbortF(NULL, "invalid reference returned from %s", PrettyMethod(m).c_str());
586  }
587  // Make sure that the result is an instance of the type this method was expected to return.
588  mirror::Class* return_type = MethodHelper(m).GetReturnType();
589
590  if (!o->InstanceOf(return_type)) {
591    JniAbortF(NULL, "attempt to return an instance of %s from %s",
592              PrettyTypeOf(o).c_str(), PrettyMethod(m).c_str());
593  }
594}
595
596static inline void CheckSuspend(Thread* thread) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
597  for (;;) {
598    if (thread->ReadFlag(kCheckpointRequest)) {
599      thread->RunCheckpointFunction();
600    } else if (thread->ReadFlag(kSuspendRequest)) {
601      thread->FullSuspendCheck();
602    } else {
603      break;
604    }
605  }
606}
607
608JValue InvokeProxyInvocationHandler(ScopedObjectAccessUnchecked& soa, const char* shorty,
609                                    jobject rcvr_jobj, jobject interface_art_method_jobj,
610                                    std::vector<jvalue>& args)
611    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
612
613// Entry point for deoptimization.
614extern "C" void art_quick_deoptimize();
615static inline uintptr_t GetQuickDeoptimizationEntryPoint() {
616  return reinterpret_cast<uintptr_t>(art_quick_deoptimize);
617}
618
619// Return address of instrumentation stub.
620extern "C" void art_quick_instrumentation_entry(void*);
621static inline void* GetQuickInstrumentationEntryPoint() {
622  return reinterpret_cast<void*>(art_quick_instrumentation_entry);
623}
624
625// The return_pc of instrumentation exit stub.
626extern "C" void art_quick_instrumentation_exit();
627static inline uintptr_t GetQuickInstrumentationExitPc() {
628  return reinterpret_cast<uintptr_t>(art_quick_instrumentation_exit);
629}
630
631extern "C" void art_portable_to_interpreter_bridge(mirror::ArtMethod*);
632static inline const void* GetPortableToInterpreterBridge() {
633  return reinterpret_cast<void*>(art_portable_to_interpreter_bridge);
634}
635
636extern "C" void art_quick_to_interpreter_bridge(mirror::ArtMethod*);
637static inline const void* GetQuickToInterpreterBridge() {
638  return reinterpret_cast<void*>(art_quick_to_interpreter_bridge);
639}
640
641// Return address of interpreter stub.
642static inline const void* GetCompiledCodeToInterpreterBridge() {
643#if defined(ART_USE_PORTABLE_COMPILER)
644  return GetPortableToInterpreterBridge();
645#else
646  return GetQuickToInterpreterBridge();
647#endif
648}
649
650
651static inline const void* GetPortableResolutionTrampoline(ClassLinker* class_linker) {
652  return class_linker->GetPortableResolutionTrampoline();
653}
654
655static inline const void* GetQuickResolutionTrampoline(ClassLinker* class_linker) {
656  return class_linker->GetQuickResolutionTrampoline();
657}
658
659// Return address of resolution trampoline stub for defined compiler.
660static inline const void* GetResolutionTrampoline(ClassLinker* class_linker) {
661#if defined(ART_USE_PORTABLE_COMPILER)
662  return GetPortableResolutionTrampoline(class_linker);
663#else
664  return GetQuickResolutionTrampoline(class_linker);
665#endif
666}
667
668extern "C" void art_portable_proxy_invoke_handler();
669static inline const void* GetPortableProxyInvokeHandler() {
670  return reinterpret_cast<void*>(art_portable_proxy_invoke_handler);
671}
672
673extern "C" void art_quick_proxy_invoke_handler();
674static inline const void* GetQuickProxyInvokeHandler() {
675  return reinterpret_cast<void*>(art_quick_proxy_invoke_handler);
676}
677
678static inline const void* GetProxyInvokeHandler() {
679#if defined(ART_USE_PORTABLE_COMPILER)
680  return GetPortableProxyInvokeHandler();
681#else
682  return GetQuickProxyInvokeHandler();
683#endif
684}
685
686extern "C" void* art_jni_dlsym_lookup_stub(JNIEnv*, jobject);
687static inline void* GetJniDlsymLookupStub() {
688  return reinterpret_cast<void*>(art_jni_dlsym_lookup_stub);
689}
690
691template <typename INT_TYPE, typename FLOAT_TYPE>
692static inline INT_TYPE art_float_to_integral(FLOAT_TYPE f) {
693  const INT_TYPE kMaxInt = static_cast<INT_TYPE>(std::numeric_limits<INT_TYPE>::max());
694  const INT_TYPE kMinInt = static_cast<INT_TYPE>(std::numeric_limits<INT_TYPE>::min());
695  const FLOAT_TYPE kMaxIntAsFloat = static_cast<FLOAT_TYPE>(kMaxInt);
696  const FLOAT_TYPE kMinIntAsFloat = static_cast<FLOAT_TYPE>(kMinInt);
697  if (LIKELY(f > kMinIntAsFloat)) {
698     if (LIKELY(f < kMaxIntAsFloat)) {
699       return static_cast<INT_TYPE>(f);
700     } else {
701       return kMaxInt;
702     }
703  } else {
704    return (f != f) ? 0 : kMinInt;  // f != f implies NaN
705  }
706}
707
708}  // namespace art
709
710#endif  // ART_RUNTIME_ENTRYPOINTS_ENTRYPOINT_UTILS_H_
711