reflection.cc revision 83c81955bfbfe8fbe6daf215ca73e436747e3e60 
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 "reflection-inl.h"
18
19#include "art_field-inl.h"
20#include "class_linker.h"
21#include "common_throws.h"
22#include "dex_file-inl.h"
23#include "entrypoints/entrypoint_utils.h"
24#include "indirect_reference_table-inl.h"
25#include "jni_internal.h"
26#include "mirror/abstract_method.h"
27#include "mirror/art_method-inl.h"
28#include "mirror/class-inl.h"
29#include "mirror/object_array-inl.h"
30#include "nth_caller_visitor.h"
31#include "scoped_thread_state_change.h"
32#include "stack.h"
33#include "well_known_classes.h"
34
35namespace art {
36
37class ArgArray {
38 public:
39  explicit ArgArray(const char* shorty, uint32_t shorty_len)
40      : shorty_(shorty), shorty_len_(shorty_len), num_bytes_(0) {
41    size_t num_slots = shorty_len + 1;  // +1 in case of receiver.
42    if (LIKELY((num_slots * 2) < kSmallArgArraySize)) {
43      // We can trivially use the small arg array.
44      arg_array_ = small_arg_array_;
45    } else {
46      // Analyze shorty to see if we need the large arg array.
47      for (size_t i = 1; i < shorty_len; ++i) {
48        char c = shorty[i];
49        if (c == 'J' || c == 'D') {
50          num_slots++;
51        }
52      }
53      if (num_slots <= kSmallArgArraySize) {
54        arg_array_ = small_arg_array_;
55      } else {
56        large_arg_array_.reset(new uint32_t[num_slots]);
57        arg_array_ = large_arg_array_.get();
58      }
59    }
60  }
61
62  uint32_t* GetArray() {
63    return arg_array_;
64  }
65
66  uint32_t GetNumBytes() {
67    return num_bytes_;
68  }
69
70  void Append(uint32_t value) {
71    arg_array_[num_bytes_ / 4] = value;
72    num_bytes_ += 4;
73  }
74
75  void Append(mirror::Object* obj) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
76    Append(StackReference<mirror::Object>::FromMirrorPtr(obj).AsVRegValue());
77  }
78
79  void AppendWide(uint64_t value) {
80    arg_array_[num_bytes_ / 4] = value;
81    arg_array_[(num_bytes_ / 4) + 1] = value >> 32;
82    num_bytes_ += 8;
83  }
84
85  void AppendFloat(float value) {
86    jvalue jv;
87    jv.f = value;
88    Append(jv.i);
89  }
90
91  void AppendDouble(double value) {
92    jvalue jv;
93    jv.d = value;
94    AppendWide(jv.j);
95  }
96
97  void BuildArgArrayFromVarArgs(const ScopedObjectAccessAlreadyRunnable& soa,
98                                mirror::Object* receiver, va_list ap)
99      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
100    // Set receiver if non-null (method is not static)
101    if (receiver != nullptr) {
102      Append(receiver);
103    }
104    for (size_t i = 1; i < shorty_len_; ++i) {
105      switch (shorty_[i]) {
106        case 'Z':
107        case 'B':
108        case 'C':
109        case 'S':
110        case 'I':
111          Append(va_arg(ap, jint));
112          break;
113        case 'F':
114          AppendFloat(va_arg(ap, jdouble));
115          break;
116        case 'L':
117          Append(soa.Decode<mirror::Object*>(va_arg(ap, jobject)));
118          break;
119        case 'D':
120          AppendDouble(va_arg(ap, jdouble));
121          break;
122        case 'J':
123          AppendWide(va_arg(ap, jlong));
124          break;
125#ifndef NDEBUG
126        default:
127          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
128#endif
129      }
130    }
131  }
132
133  void BuildArgArrayFromJValues(const ScopedObjectAccessAlreadyRunnable& soa,
134                                mirror::Object* receiver, jvalue* args)
135      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
136    // Set receiver if non-null (method is not static)
137    if (receiver != nullptr) {
138      Append(receiver);
139    }
140    for (size_t i = 1, args_offset = 0; i < shorty_len_; ++i, ++args_offset) {
141      switch (shorty_[i]) {
142        case 'Z':
143          Append(args[args_offset].z);
144          break;
145        case 'B':
146          Append(args[args_offset].b);
147          break;
148        case 'C':
149          Append(args[args_offset].c);
150          break;
151        case 'S':
152          Append(args[args_offset].s);
153          break;
154        case 'I':
155        case 'F':
156          Append(args[args_offset].i);
157          break;
158        case 'L':
159          Append(soa.Decode<mirror::Object*>(args[args_offset].l));
160          break;
161        case 'D':
162        case 'J':
163          AppendWide(args[args_offset].j);
164          break;
165#ifndef NDEBUG
166        default:
167          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
168#endif
169      }
170    }
171  }
172
173  void BuildArgArrayFromFrame(ShadowFrame* shadow_frame, uint32_t arg_offset)
174      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
175    // Set receiver if non-null (method is not static)
176    size_t cur_arg = arg_offset;
177    if (!shadow_frame->GetMethod()->IsStatic()) {
178      Append(shadow_frame->GetVReg(cur_arg));
179      cur_arg++;
180    }
181    for (size_t i = 1; i < shorty_len_; ++i) {
182      switch (shorty_[i]) {
183        case 'Z':
184        case 'B':
185        case 'C':
186        case 'S':
187        case 'I':
188        case 'F':
189        case 'L':
190          Append(shadow_frame->GetVReg(cur_arg));
191          cur_arg++;
192          break;
193        case 'D':
194        case 'J':
195          AppendWide(shadow_frame->GetVRegLong(cur_arg));
196          cur_arg++;
197          cur_arg++;
198          break;
199#ifndef NDEBUG
200        default:
201          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
202#endif
203      }
204    }
205  }
206
207  static void ThrowIllegalPrimitiveArgumentException(const char* expected,
208                                                     const char* found_descriptor)
209      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
210    ThrowIllegalArgumentException(
211        StringPrintf("Invalid primitive conversion from %s to %s", expected,
212                     PrettyDescriptor(found_descriptor).c_str()).c_str());
213  }
214
215  bool BuildArgArrayFromObjectArray(mirror::Object* receiver,
216                                    mirror::ObjectArray<mirror::Object>* args,
217                                    Handle<mirror::ArtMethod> h_m)
218      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
219    const DexFile::TypeList* classes = h_m->GetParameterTypeList();
220    // Set receiver if non-null (method is not static)
221    if (receiver != nullptr) {
222      Append(receiver);
223    }
224    for (size_t i = 1, args_offset = 0; i < shorty_len_; ++i, ++args_offset) {
225      mirror::Object* arg = args->Get(args_offset);
226      if (((shorty_[i] == 'L') && (arg != nullptr)) || ((arg == nullptr && shorty_[i] != 'L'))) {
227        mirror::Class* dst_class =
228            h_m->GetClassFromTypeIndex(classes->GetTypeItem(args_offset).type_idx_, true);
229        if (UNLIKELY(arg == nullptr || !arg->InstanceOf(dst_class))) {
230          ThrowIllegalArgumentException(
231              StringPrintf("method %s argument %zd has type %s, got %s",
232                  PrettyMethod(h_m.Get(), false).c_str(),
233                  args_offset + 1,  // Humans don't count from 0.
234                  PrettyDescriptor(dst_class).c_str(),
235                  PrettyTypeOf(arg).c_str()).c_str());
236          return false;
237        }
238      }
239
240#define DO_FIRST_ARG(match_descriptor, get_fn, append) { \
241          if (LIKELY(arg != nullptr && arg->GetClass<>()->DescriptorEquals(match_descriptor))) { \
242            ArtField* primitive_field = arg->GetClass()->GetInstanceField(0); \
243            append(primitive_field-> get_fn(arg));
244
245#define DO_ARG(match_descriptor, get_fn, append) \
246          } else if (LIKELY(arg != nullptr && \
247                            arg->GetClass<>()->DescriptorEquals(match_descriptor))) { \
248            ArtField* primitive_field = arg->GetClass()->GetInstanceField(0); \
249            append(primitive_field-> get_fn(arg));
250
251#define DO_FAIL(expected) \
252          } else { \
253            if (arg->GetClass<>()->IsPrimitive()) { \
254              std::string temp; \
255              ThrowIllegalPrimitiveArgumentException(expected, \
256                                                     arg->GetClass<>()->GetDescriptor(&temp)); \
257            } else { \
258              ThrowIllegalArgumentException(\
259                  StringPrintf("method %s argument %zd has type %s, got %s", \
260                      PrettyMethod(h_m.Get(), false).c_str(), \
261                      args_offset + 1, \
262                      expected, \
263                      PrettyTypeOf(arg).c_str()).c_str()); \
264            } \
265            return false; \
266          } }
267
268      switch (shorty_[i]) {
269        case 'L':
270          Append(arg);
271          break;
272        case 'Z':
273          DO_FIRST_ARG("Ljava/lang/Boolean;", GetBoolean, Append)
274          DO_FAIL("boolean")
275          break;
276        case 'B':
277          DO_FIRST_ARG("Ljava/lang/Byte;", GetByte, Append)
278          DO_FAIL("byte")
279          break;
280        case 'C':
281          DO_FIRST_ARG("Ljava/lang/Character;", GetChar, Append)
282          DO_FAIL("char")
283          break;
284        case 'S':
285          DO_FIRST_ARG("Ljava/lang/Short;", GetShort, Append)
286          DO_ARG("Ljava/lang/Byte;", GetByte, Append)
287          DO_FAIL("short")
288          break;
289        case 'I':
290          DO_FIRST_ARG("Ljava/lang/Integer;", GetInt, Append)
291          DO_ARG("Ljava/lang/Character;", GetChar, Append)
292          DO_ARG("Ljava/lang/Short;", GetShort, Append)
293          DO_ARG("Ljava/lang/Byte;", GetByte, Append)
294          DO_FAIL("int")
295          break;
296        case 'J':
297          DO_FIRST_ARG("Ljava/lang/Long;", GetLong, AppendWide)
298          DO_ARG("Ljava/lang/Integer;", GetInt, AppendWide)
299          DO_ARG("Ljava/lang/Character;", GetChar, AppendWide)
300          DO_ARG("Ljava/lang/Short;", GetShort, AppendWide)
301          DO_ARG("Ljava/lang/Byte;", GetByte, AppendWide)
302          DO_FAIL("long")
303          break;
304        case 'F':
305          DO_FIRST_ARG("Ljava/lang/Float;", GetFloat, AppendFloat)
306          DO_ARG("Ljava/lang/Long;", GetLong, AppendFloat)
307          DO_ARG("Ljava/lang/Integer;", GetInt, AppendFloat)
308          DO_ARG("Ljava/lang/Character;", GetChar, AppendFloat)
309          DO_ARG("Ljava/lang/Short;", GetShort, AppendFloat)
310          DO_ARG("Ljava/lang/Byte;", GetByte, AppendFloat)
311          DO_FAIL("float")
312          break;
313        case 'D':
314          DO_FIRST_ARG("Ljava/lang/Double;", GetDouble, AppendDouble)
315          DO_ARG("Ljava/lang/Float;", GetFloat, AppendDouble)
316          DO_ARG("Ljava/lang/Long;", GetLong, AppendDouble)
317          DO_ARG("Ljava/lang/Integer;", GetInt, AppendDouble)
318          DO_ARG("Ljava/lang/Character;", GetChar, AppendDouble)
319          DO_ARG("Ljava/lang/Short;", GetShort, AppendDouble)
320          DO_ARG("Ljava/lang/Byte;", GetByte, AppendDouble)
321          DO_FAIL("double")
322          break;
323#ifndef NDEBUG
324        default:
325          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
326          UNREACHABLE();
327#endif
328      }
329#undef DO_FIRST_ARG
330#undef DO_ARG
331#undef DO_FAIL
332    }
333    return true;
334  }
335
336 private:
337  enum { kSmallArgArraySize = 16 };
338  const char* const shorty_;
339  const uint32_t shorty_len_;
340  uint32_t num_bytes_;
341  uint32_t* arg_array_;
342  uint32_t small_arg_array_[kSmallArgArraySize];
343  std::unique_ptr<uint32_t[]> large_arg_array_;
344};
345
346static void CheckMethodArguments(JavaVMExt* vm, mirror::ArtMethod* m, uint32_t* args)
347    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
348  const DexFile::TypeList* params = m->GetParameterTypeList();
349  if (params == nullptr) {
350    return;  // No arguments so nothing to check.
351  }
352  uint32_t offset = 0;
353  uint32_t num_params = params->Size();
354  size_t error_count = 0;
355  if (!m->IsStatic()) {
356    offset = 1;
357  }
358  // TODO: If args contain object references, it may cause problems.
359  Thread* self = Thread::Current();
360  StackHandleScope<1> hs(self);
361  Handle<mirror::ArtMethod> h_m(hs.NewHandle(m));
362  for (uint32_t i = 0; i < num_params; i++) {
363    uint16_t type_idx = params->GetTypeItem(i).type_idx_;
364    mirror::Class* param_type = h_m->GetClassFromTypeIndex(type_idx, true);
365    if (param_type == nullptr) {
366      CHECK(self->IsExceptionPending());
367      LOG(ERROR) << "Internal error: unresolvable type for argument type in JNI invoke: "
368          << h_m->GetTypeDescriptorFromTypeIdx(type_idx) << "\n"
369          << self->GetException()->Dump();
370      self->ClearException();
371      ++error_count;
372    } else if (!param_type->IsPrimitive()) {
373      // TODO: There is a compaction bug here since GetClassFromTypeIdx can cause thread suspension,
374      // this is a hard to fix problem since the args can contain Object*, we need to save and
375      // restore them by using a visitor similar to the ones used in the trampoline entrypoints.
376      mirror::Object* argument =
377          (reinterpret_cast<StackReference<mirror::Object>*>(&args[i + offset]))->AsMirrorPtr();
378      if (argument != nullptr && !argument->InstanceOf(param_type)) {
379        LOG(ERROR) << "JNI ERROR (app bug): attempt to pass an instance of "
380                   << PrettyTypeOf(argument) << " as argument " << (i + 1)
381                   << " to " << PrettyMethod(h_m.Get());
382        ++error_count;
383      }
384    } else if (param_type->IsPrimitiveLong() || param_type->IsPrimitiveDouble()) {
385      offset++;
386    } else {
387      int32_t arg = static_cast<int32_t>(args[i + offset]);
388      if (param_type->IsPrimitiveBoolean()) {
389        if (arg != JNI_TRUE && arg != JNI_FALSE) {
390          LOG(ERROR) << "JNI ERROR (app bug): expected jboolean (0/1) but got value of "
391              << arg << " as argument " << (i + 1) << " to " << PrettyMethod(h_m.Get());
392          ++error_count;
393        }
394      } else if (param_type->IsPrimitiveByte()) {
395        if (arg < -128 || arg > 127) {
396          LOG(ERROR) << "JNI ERROR (app bug): expected jbyte but got value of "
397              << arg << " as argument " << (i + 1) << " to " << PrettyMethod(h_m.Get());
398          ++error_count;
399        }
400      } else if (param_type->IsPrimitiveChar()) {
401        if (args[i + offset] > 0xFFFF) {
402          LOG(ERROR) << "JNI ERROR (app bug): expected jchar but got value of "
403              << arg << " as argument " << (i + 1) << " to " << PrettyMethod(h_m.Get());
404          ++error_count;
405        }
406      } else if (param_type->IsPrimitiveShort()) {
407        if (arg < -32768 || arg > 0x7FFF) {
408          LOG(ERROR) << "JNI ERROR (app bug): expected jshort but got value of "
409              << arg << " as argument " << (i + 1) << " to " << PrettyMethod(h_m.Get());
410          ++error_count;
411        }
412      }
413    }
414  }
415  if (UNLIKELY(error_count > 0)) {
416    // TODO: pass the JNI function name (such as "CallVoidMethodV") through so we can call JniAbort
417    // with an argument.
418    vm->JniAbortF(nullptr, "bad arguments passed to %s (see above for details)",
419                  PrettyMethod(h_m.Get()).c_str());
420  }
421}
422
423static mirror::ArtMethod* FindVirtualMethod(mirror::Object* receiver,
424                                            mirror::ArtMethod* method)
425    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
426  return receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(method);
427}
428
429
430static void InvokeWithArgArray(const ScopedObjectAccessAlreadyRunnable& soa,
431                               mirror::ArtMethod* method, ArgArray* arg_array, JValue* result,
432                               const char* shorty)
433    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
434  uint32_t* args = arg_array->GetArray();
435  if (UNLIKELY(soa.Env()->check_jni)) {
436    CheckMethodArguments(soa.Vm(), method, args);
437  }
438  method->Invoke(soa.Self(), args, arg_array->GetNumBytes(), result, shorty);
439}
440
441JValue InvokeWithVarArgs(const ScopedObjectAccessAlreadyRunnable& soa, jobject obj, jmethodID mid,
442                         va_list args)
443    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
444  // We want to make sure that the stack is not within a small distance from the
445  // protected region in case we are calling into a leaf function whose stack
446  // check has been elided.
447  if (UNLIKELY(__builtin_frame_address(0) < soa.Self()->GetStackEnd())) {
448    ThrowStackOverflowError(soa.Self());
449    return JValue();
450  }
451
452  mirror::ArtMethod* method = soa.DecodeMethod(mid);
453  bool is_string_init = method->GetDeclaringClass()->IsStringClass() && method->IsConstructor();
454  if (is_string_init) {
455    // Replace calls to String.<init> with equivalent StringFactory call.
456    method = soa.DecodeMethod(WellKnownClasses::StringInitToStringFactoryMethodID(mid));
457  }
458  mirror::Object* receiver = method->IsStatic() ? nullptr : soa.Decode<mirror::Object*>(obj);
459  uint32_t shorty_len = 0;
460  const char* shorty = method->GetShorty(&shorty_len);
461  JValue result;
462  ArgArray arg_array(shorty, shorty_len);
463  arg_array.BuildArgArrayFromVarArgs(soa, receiver, args);
464  InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
465  if (is_string_init) {
466    // For string init, remap original receiver to StringFactory result.
467    UpdateReference(soa.Self(), obj, result.GetL());
468  }
469  return result;
470}
471
472JValue InvokeWithJValues(const ScopedObjectAccessAlreadyRunnable& soa, jobject obj, jmethodID mid,
473                         jvalue* args) {
474  // We want to make sure that the stack is not within a small distance from the
475  // protected region in case we are calling into a leaf function whose stack
476  // check has been elided.
477  if (UNLIKELY(__builtin_frame_address(0) < soa.Self()->GetStackEnd())) {
478    ThrowStackOverflowError(soa.Self());
479    return JValue();
480  }
481
482  mirror::ArtMethod* method = soa.DecodeMethod(mid);
483  bool is_string_init = method->GetDeclaringClass()->IsStringClass() && method->IsConstructor();
484  if (is_string_init) {
485    // Replace calls to String.<init> with equivalent StringFactory call.
486    method = soa.DecodeMethod(WellKnownClasses::StringInitToStringFactoryMethodID(mid));
487  }
488  mirror::Object* receiver = method->IsStatic() ? nullptr : soa.Decode<mirror::Object*>(obj);
489  uint32_t shorty_len = 0;
490  const char* shorty = method->GetShorty(&shorty_len);
491  JValue result;
492  ArgArray arg_array(shorty, shorty_len);
493  arg_array.BuildArgArrayFromJValues(soa, receiver, args);
494  InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
495  if (is_string_init) {
496    // For string init, remap original receiver to StringFactory result.
497    UpdateReference(soa.Self(), obj, result.GetL());
498  }
499  return result;
500}
501
502JValue InvokeVirtualOrInterfaceWithJValues(const ScopedObjectAccessAlreadyRunnable& soa,
503                                           jobject obj, jmethodID mid, jvalue* args) {
504  // We want to make sure that the stack is not within a small distance from the
505  // protected region in case we are calling into a leaf function whose stack
506  // check has been elided.
507  if (UNLIKELY(__builtin_frame_address(0) < soa.Self()->GetStackEnd())) {
508    ThrowStackOverflowError(soa.Self());
509    return JValue();
510  }
511
512  mirror::Object* receiver = soa.Decode<mirror::Object*>(obj);
513  mirror::ArtMethod* method = FindVirtualMethod(receiver, soa.DecodeMethod(mid));
514  bool is_string_init = method->GetDeclaringClass()->IsStringClass() && method->IsConstructor();
515  if (is_string_init) {
516    // Replace calls to String.<init> with equivalent StringFactory call.
517    method = soa.DecodeMethod(WellKnownClasses::StringInitToStringFactoryMethodID(mid));
518    receiver = nullptr;
519  }
520  uint32_t shorty_len = 0;
521  const char* shorty = method->GetShorty(&shorty_len);
522  JValue result;
523  ArgArray arg_array(shorty, shorty_len);
524  arg_array.BuildArgArrayFromJValues(soa, receiver, args);
525  InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
526  if (is_string_init) {
527    // For string init, remap original receiver to StringFactory result.
528    UpdateReference(soa.Self(), obj, result.GetL());
529  }
530  return result;
531}
532
533JValue InvokeVirtualOrInterfaceWithVarArgs(const ScopedObjectAccessAlreadyRunnable& soa,
534                                           jobject obj, jmethodID mid, va_list args) {
535  // We want to make sure that the stack is not within a small distance from the
536  // protected region in case we are calling into a leaf function whose stack
537  // check has been elided.
538  if (UNLIKELY(__builtin_frame_address(0) < soa.Self()->GetStackEnd())) {
539    ThrowStackOverflowError(soa.Self());
540    return JValue();
541  }
542
543  mirror::Object* receiver = soa.Decode<mirror::Object*>(obj);
544  mirror::ArtMethod* method = FindVirtualMethod(receiver, soa.DecodeMethod(mid));
545  bool is_string_init = method->GetDeclaringClass()->IsStringClass() && method->IsConstructor();
546  if (is_string_init) {
547    // Replace calls to String.<init> with equivalent StringFactory call.
548    method = soa.DecodeMethod(WellKnownClasses::StringInitToStringFactoryMethodID(mid));
549    receiver = nullptr;
550  }
551  uint32_t shorty_len = 0;
552  const char* shorty = method->GetShorty(&shorty_len);
553  JValue result;
554  ArgArray arg_array(shorty, shorty_len);
555  arg_array.BuildArgArrayFromVarArgs(soa, receiver, args);
556  InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
557  if (is_string_init) {
558    // For string init, remap original receiver to StringFactory result.
559    UpdateReference(soa.Self(), obj, result.GetL());
560  }
561  return result;
562}
563
564jobject InvokeMethod(const ScopedObjectAccessAlreadyRunnable& soa, jobject javaMethod,
565                     jobject javaReceiver, jobject javaArgs, size_t num_frames) {
566  // We want to make sure that the stack is not within a small distance from the
567  // protected region in case we are calling into a leaf function whose stack
568  // check has been elided.
569  if (UNLIKELY(__builtin_frame_address(0) <
570               soa.Self()->GetStackEndForInterpreter(true))) {
571    ThrowStackOverflowError(soa.Self());
572    return nullptr;
573  }
574
575  auto* abstract_method = soa.Decode<mirror::AbstractMethod*>(javaMethod);
576  const bool accessible = abstract_method->IsAccessible();
577  mirror::ArtMethod* m = abstract_method->GetArtMethod();
578
579  mirror::Class* declaring_class = m->GetDeclaringClass();
580  if (UNLIKELY(!declaring_class->IsInitialized())) {
581    StackHandleScope<1> hs(soa.Self());
582    Handle<mirror::Class> h_class(hs.NewHandle(declaring_class));
583    if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(soa.Self(), h_class, true, true)) {
584      return nullptr;
585    }
586    declaring_class = h_class.Get();
587  }
588
589  mirror::Object* receiver = nullptr;
590  if (!m->IsStatic()) {
591    // Replace calls to String.<init> with equivalent StringFactory call.
592    if (declaring_class->IsStringClass() && m->IsConstructor()) {
593      jmethodID mid = soa.EncodeMethod(m);
594      m = soa.DecodeMethod(WellKnownClasses::StringInitToStringFactoryMethodID(mid));
595      CHECK(javaReceiver == nullptr);
596    } else {
597      // Check that the receiver is non-null and an instance of the field's declaring class.
598      receiver = soa.Decode<mirror::Object*>(javaReceiver);
599      if (!VerifyObjectIsClass(receiver, declaring_class)) {
600        return nullptr;
601      }
602
603      // Find the actual implementation of the virtual method.
604      m = receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(m);
605    }
606  }
607
608  // Get our arrays of arguments and their types, and check they're the same size.
609  auto* objects = soa.Decode<mirror::ObjectArray<mirror::Object>*>(javaArgs);
610  const DexFile::TypeList* classes = m->GetParameterTypeList();
611  uint32_t classes_size = (classes == nullptr) ? 0 : classes->Size();
612  uint32_t arg_count = (objects != nullptr) ? objects->GetLength() : 0;
613  if (arg_count != classes_size) {
614    ThrowIllegalArgumentException(StringPrintf("Wrong number of arguments; expected %d, got %d",
615                                               classes_size, arg_count).c_str());
616    return nullptr;
617  }
618
619  // If method is not set to be accessible, verify it can be accessed by the caller.
620  mirror::Class* calling_class = nullptr;
621  if (!accessible && !VerifyAccess(soa.Self(), receiver, declaring_class, m->GetAccessFlags(),
622                                   &calling_class, num_frames)) {
623    ThrowIllegalAccessException(
624        StringPrintf("Class %s cannot access %s method %s of class %s",
625            calling_class == nullptr ? "null" : PrettyClass(calling_class).c_str(),
626            PrettyJavaAccessFlags(m->GetAccessFlags()).c_str(),
627            PrettyMethod(m).c_str(),
628            m->GetDeclaringClass() == nullptr ? "null" :
629                PrettyClass(m->GetDeclaringClass()).c_str()).c_str());
630    return nullptr;
631  }
632
633  // Invoke the method.
634  JValue result;
635  uint32_t shorty_len = 0;
636  const char* shorty = m->GetShorty(&shorty_len);
637  ArgArray arg_array(shorty, shorty_len);
638  StackHandleScope<1> hs(soa.Self());
639  Handle<mirror::ArtMethod> h_m(hs.NewHandle(m));
640  if (!arg_array.BuildArgArrayFromObjectArray(receiver, objects, h_m)) {
641    CHECK(soa.Self()->IsExceptionPending());
642    return nullptr;
643  }
644
645  InvokeWithArgArray(soa, m, &arg_array, &result, shorty);
646
647  // Wrap any exception with "Ljava/lang/reflect/InvocationTargetException;" and return early.
648  if (soa.Self()->IsExceptionPending()) {
649    // If we get another exception when we are trying to wrap, then just use that instead.
650    jthrowable th = soa.Env()->ExceptionOccurred();
651    soa.Self()->ClearException();
652    jclass exception_class = soa.Env()->FindClass("java/lang/reflect/InvocationTargetException");
653    if (exception_class == nullptr) {
654      soa.Self()->AssertPendingOOMException();
655      return nullptr;
656    }
657    jmethodID mid = soa.Env()->GetMethodID(exception_class, "<init>", "(Ljava/lang/Throwable;)V");
658    CHECK(mid != nullptr);
659    jobject exception_instance = soa.Env()->NewObject(exception_class, mid, th);
660    if (exception_instance == nullptr) {
661      soa.Self()->AssertPendingOOMException();
662      return nullptr;
663    }
664    soa.Env()->Throw(reinterpret_cast<jthrowable>(exception_instance));
665    return nullptr;
666  }
667
668  // Box if necessary and return.
669  return soa.AddLocalReference<jobject>(BoxPrimitive(Primitive::GetType(shorty[0]), result));
670}
671
672mirror::Object* BoxPrimitive(Primitive::Type src_class, const JValue& value) {
673  if (src_class == Primitive::kPrimNot) {
674    return value.GetL();
675  }
676  if (src_class == Primitive::kPrimVoid) {
677    // There's no such thing as a void field, and void methods invoked via reflection return null.
678    return nullptr;
679  }
680
681  jmethodID m = nullptr;
682  const char* shorty;
683  switch (src_class) {
684  case Primitive::kPrimBoolean:
685    m = WellKnownClasses::java_lang_Boolean_valueOf;
686    shorty = "LZ";
687    break;
688  case Primitive::kPrimByte:
689    m = WellKnownClasses::java_lang_Byte_valueOf;
690    shorty = "LB";
691    break;
692  case Primitive::kPrimChar:
693    m = WellKnownClasses::java_lang_Character_valueOf;
694    shorty = "LC";
695    break;
696  case Primitive::kPrimDouble:
697    m = WellKnownClasses::java_lang_Double_valueOf;
698    shorty = "LD";
699    break;
700  case Primitive::kPrimFloat:
701    m = WellKnownClasses::java_lang_Float_valueOf;
702    shorty = "LF";
703    break;
704  case Primitive::kPrimInt:
705    m = WellKnownClasses::java_lang_Integer_valueOf;
706    shorty = "LI";
707    break;
708  case Primitive::kPrimLong:
709    m = WellKnownClasses::java_lang_Long_valueOf;
710    shorty = "LJ";
711    break;
712  case Primitive::kPrimShort:
713    m = WellKnownClasses::java_lang_Short_valueOf;
714    shorty = "LS";
715    break;
716  default:
717    LOG(FATAL) << static_cast<int>(src_class);
718    shorty = nullptr;
719  }
720
721  ScopedObjectAccessUnchecked soa(Thread::Current());
722  DCHECK_EQ(soa.Self()->GetState(), kRunnable);
723
724  ArgArray arg_array(shorty, 2);
725  JValue result;
726  if (src_class == Primitive::kPrimDouble || src_class == Primitive::kPrimLong) {
727    arg_array.AppendWide(value.GetJ());
728  } else {
729    arg_array.Append(value.GetI());
730  }
731
732  soa.DecodeMethod(m)->Invoke(soa.Self(), arg_array.GetArray(), arg_array.GetNumBytes(),
733                              &result, shorty);
734  return result.GetL();
735}
736
737static std::string UnboxingFailureKind(ArtField* f)
738    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
739  if (f != nullptr) {
740    return "field " + PrettyField(f, false);
741  }
742  return "result";
743}
744
745static bool UnboxPrimitive(mirror::Object* o,
746                           mirror::Class* dst_class, ArtField* f,
747                           JValue* unboxed_value)
748    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
749  bool unbox_for_result = (f == nullptr);
750  if (!dst_class->IsPrimitive()) {
751    if (UNLIKELY(o != nullptr && !o->InstanceOf(dst_class))) {
752      if (!unbox_for_result) {
753        ThrowIllegalArgumentException(StringPrintf("%s has type %s, got %s",
754                                                   UnboxingFailureKind(f).c_str(),
755                                                   PrettyDescriptor(dst_class).c_str(),
756                                                   PrettyTypeOf(o).c_str()).c_str());
757      } else {
758        ThrowClassCastException(StringPrintf("Couldn't convert result of type %s to %s",
759                                             PrettyTypeOf(o).c_str(),
760                                             PrettyDescriptor(dst_class).c_str()).c_str());
761      }
762      return false;
763    }
764    unboxed_value->SetL(o);
765    return true;
766  }
767  if (UNLIKELY(dst_class->GetPrimitiveType() == Primitive::kPrimVoid)) {
768    ThrowIllegalArgumentException(StringPrintf("Can't unbox %s to void",
769                                               UnboxingFailureKind(f).c_str()).c_str());
770    return false;
771  }
772  if (UNLIKELY(o == nullptr)) {
773    if (!unbox_for_result) {
774      ThrowIllegalArgumentException(StringPrintf("%s has type %s, got null",
775                                                 UnboxingFailureKind(f).c_str(),
776                                                 PrettyDescriptor(dst_class).c_str()).c_str());
777    } else {
778      ThrowNullPointerException(StringPrintf("Expected to unbox a '%s' primitive type but was returned null",
779                                             PrettyDescriptor(dst_class).c_str()).c_str());
780    }
781    return false;
782  }
783
784  JValue boxed_value;
785  mirror::Class* klass = o->GetClass();
786  mirror::Class* src_class = nullptr;
787  ClassLinker* const class_linker = Runtime::Current()->GetClassLinker();
788  ArtField* primitive_field = &klass->GetIFields()[0];
789  if (klass->DescriptorEquals("Ljava/lang/Boolean;")) {
790    src_class = class_linker->FindPrimitiveClass('Z');
791    boxed_value.SetZ(primitive_field->GetBoolean(o));
792  } else if (klass->DescriptorEquals("Ljava/lang/Byte;")) {
793    src_class = class_linker->FindPrimitiveClass('B');
794    boxed_value.SetB(primitive_field->GetByte(o));
795  } else if (klass->DescriptorEquals("Ljava/lang/Character;")) {
796    src_class = class_linker->FindPrimitiveClass('C');
797    boxed_value.SetC(primitive_field->GetChar(o));
798  } else if (klass->DescriptorEquals("Ljava/lang/Float;")) {
799    src_class = class_linker->FindPrimitiveClass('F');
800    boxed_value.SetF(primitive_field->GetFloat(o));
801  } else if (klass->DescriptorEquals("Ljava/lang/Double;")) {
802    src_class = class_linker->FindPrimitiveClass('D');
803    boxed_value.SetD(primitive_field->GetDouble(o));
804  } else if (klass->DescriptorEquals("Ljava/lang/Integer;")) {
805    src_class = class_linker->FindPrimitiveClass('I');
806    boxed_value.SetI(primitive_field->GetInt(o));
807  } else if (klass->DescriptorEquals("Ljava/lang/Long;")) {
808    src_class = class_linker->FindPrimitiveClass('J');
809    boxed_value.SetJ(primitive_field->GetLong(o));
810  } else if (klass->DescriptorEquals("Ljava/lang/Short;")) {
811    src_class = class_linker->FindPrimitiveClass('S');
812    boxed_value.SetS(primitive_field->GetShort(o));
813  } else {
814    std::string temp;
815    ThrowIllegalArgumentException(
816        StringPrintf("%s has type %s, got %s", UnboxingFailureKind(f).c_str(),
817            PrettyDescriptor(dst_class).c_str(),
818            PrettyDescriptor(o->GetClass()->GetDescriptor(&temp)).c_str()).c_str());
819    return false;
820  }
821
822  return ConvertPrimitiveValue(unbox_for_result,
823                               src_class->GetPrimitiveType(), dst_class->GetPrimitiveType(),
824                               boxed_value, unboxed_value);
825}
826
827bool UnboxPrimitiveForField(mirror::Object* o, mirror::Class* dst_class, ArtField* f,
828                            JValue* unboxed_value) {
829  DCHECK(f != nullptr);
830  return UnboxPrimitive(o, dst_class, f, unboxed_value);
831}
832
833bool UnboxPrimitiveForResult(mirror::Object* o, mirror::Class* dst_class, JValue* unboxed_value) {
834  return UnboxPrimitive(o, dst_class, nullptr, unboxed_value);
835}
836
837mirror::Class* GetCallingClass(Thread* self, size_t num_frames) {
838  NthCallerVisitor visitor(self, num_frames);
839  visitor.WalkStack();
840  return visitor.caller != nullptr ? visitor.caller->GetDeclaringClass() : nullptr;
841}
842
843bool VerifyAccess(Thread* self, mirror::Object* obj, mirror::Class* declaring_class,
844                  uint32_t access_flags, mirror::Class** calling_class, size_t num_frames) {
845  if ((access_flags & kAccPublic) != 0) {
846    return true;
847  }
848  auto* klass = GetCallingClass(self, num_frames);
849  if (UNLIKELY(klass == nullptr)) {
850    // The caller is an attached native thread.
851    return false;
852  }
853  *calling_class = klass;
854  return VerifyAccess(self, obj, declaring_class, access_flags, klass);
855}
856
857bool VerifyAccess(Thread* self, mirror::Object* obj, mirror::Class* declaring_class,
858                  uint32_t access_flags, mirror::Class* calling_class) {
859  if (calling_class == declaring_class) {
860    return true;
861  }
862  ScopedAssertNoThreadSuspension sants(self, "verify-access");
863  if ((access_flags & kAccPrivate) != 0) {
864    return false;
865  }
866  if ((access_flags & kAccProtected) != 0) {
867    if (obj != nullptr && !obj->InstanceOf(calling_class) &&
868        !declaring_class->IsInSamePackage(calling_class)) {
869      return false;
870    } else if (declaring_class->IsAssignableFrom(calling_class)) {
871      return true;
872    }
873  }
874  return declaring_class->IsInSamePackage(calling_class);
875}
876
877void InvalidReceiverError(mirror::Object* o, mirror::Class* c) {
878  std::string expected_class_name(PrettyDescriptor(c));
879  std::string actual_class_name(PrettyTypeOf(o));
880  ThrowIllegalArgumentException(StringPrintf("Expected receiver of type %s, but got %s",
881                                             expected_class_name.c_str(),
882                                             actual_class_name.c_str()).c_str());
883}
884
885// This only works if there's one reference which points to the object in obj.
886// Will need to be fixed if there's cases where it's not.
887void UpdateReference(Thread* self, jobject obj, mirror::Object* result) {
888  IndirectRef ref = reinterpret_cast<IndirectRef>(obj);
889  IndirectRefKind kind = GetIndirectRefKind(ref);
890  if (kind == kLocal) {
891    self->GetJniEnv()->locals.Update(obj, result);
892  } else if (kind == kHandleScopeOrInvalid) {
893    LOG(FATAL) << "Unsupported UpdateReference for kind kHandleScopeOrInvalid";
894  } else if (kind == kGlobal) {
895    self->GetJniEnv()->vm->UpdateGlobal(self, ref, result);
896  } else {
897    DCHECK_EQ(kind, kWeakGlobal);
898    self->GetJniEnv()->vm->UpdateWeakGlobal(self, ref, result);
899  }
900}
901
902}  // namespace art
903