reflection.cc revision ca239af73e512df5eeb80fe6c09c2ca614649e06 
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 "class_linker.h"
20#include "common_throws.h"
21#include "dex_file-inl.h"
22#include "entrypoints/entrypoint_utils.h"
23#include "jni_internal.h"
24#include "mirror/art_field-inl.h"
25#include "mirror/art_method-inl.h"
26#include "mirror/class-inl.h"
27#include "mirror/object_array-inl.h"
28#include "mirror/object_array.h"
29#include "nth_caller_visitor.h"
30#include "scoped_thread_state_change.h"
31#include "stack.h"
32#include "well_known_classes.h"
33
34namespace art {
35
36class ArgArray {
37 public:
38  explicit ArgArray(const char* shorty, uint32_t shorty_len)
39      : shorty_(shorty), shorty_len_(shorty_len), num_bytes_(0) {
40    size_t num_slots = shorty_len + 1;  // +1 in case of receiver.
41    if (LIKELY((num_slots * 2) < kSmallArgArraySize)) {
42      // We can trivially use the small arg array.
43      arg_array_ = small_arg_array_;
44    } else {
45      // Analyze shorty to see if we need the large arg array.
46      for (size_t i = 1; i < shorty_len; ++i) {
47        char c = shorty[i];
48        if (c == 'J' || c == 'D') {
49          num_slots++;
50        }
51      }
52      if (num_slots <= kSmallArgArraySize) {
53        arg_array_ = small_arg_array_;
54      } else {
55        large_arg_array_.reset(new uint32_t[num_slots]);
56        arg_array_ = large_arg_array_.get();
57      }
58    }
59  }
60
61  uint32_t* GetArray() {
62    return arg_array_;
63  }
64
65  uint32_t GetNumBytes() {
66    return num_bytes_;
67  }
68
69  void Append(uint32_t value) {
70    arg_array_[num_bytes_ / 4] = value;
71    num_bytes_ += 4;
72  }
73
74  void Append(mirror::Object* obj) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
75    Append(StackReference<mirror::Object>::FromMirrorPtr(obj).AsVRegValue());
76  }
77
78  void AppendWide(uint64_t value) {
79    arg_array_[num_bytes_ / 4] = value;
80    arg_array_[(num_bytes_ / 4) + 1] = value >> 32;
81    num_bytes_ += 8;
82  }
83
84  void AppendFloat(float value) {
85    jvalue jv;
86    jv.f = value;
87    Append(jv.i);
88  }
89
90  void AppendDouble(double value) {
91    jvalue jv;
92    jv.d = value;
93    AppendWide(jv.j);
94  }
95
96  void BuildArgArrayFromVarArgs(const ScopedObjectAccessAlreadyRunnable& soa,
97                                mirror::Object* receiver, va_list ap)
98      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
99    // Set receiver if non-null (method is not static)
100    if (receiver != nullptr) {
101      Append(receiver);
102    }
103    for (size_t i = 1; i < shorty_len_; ++i) {
104      switch (shorty_[i]) {
105        case 'Z':
106        case 'B':
107        case 'C':
108        case 'S':
109        case 'I':
110          Append(va_arg(ap, jint));
111          break;
112        case 'F':
113          AppendFloat(va_arg(ap, jdouble));
114          break;
115        case 'L':
116          Append(soa.Decode<mirror::Object*>(va_arg(ap, jobject)));
117          break;
118        case 'D':
119          AppendDouble(va_arg(ap, jdouble));
120          break;
121        case 'J':
122          AppendWide(va_arg(ap, jlong));
123          break;
124#ifndef NDEBUG
125        default:
126          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
127#endif
128      }
129    }
130  }
131
132  void BuildArgArrayFromJValues(const ScopedObjectAccessAlreadyRunnable& soa,
133                                mirror::Object* receiver, jvalue* args)
134      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
135    // Set receiver if non-null (method is not static)
136    if (receiver != nullptr) {
137      Append(receiver);
138    }
139    for (size_t i = 1, args_offset = 0; i < shorty_len_; ++i, ++args_offset) {
140      switch (shorty_[i]) {
141        case 'Z':
142          Append(args[args_offset].z);
143          break;
144        case 'B':
145          Append(args[args_offset].b);
146          break;
147        case 'C':
148          Append(args[args_offset].c);
149          break;
150        case 'S':
151          Append(args[args_offset].s);
152          break;
153        case 'I':
154        case 'F':
155          Append(args[args_offset].i);
156          break;
157        case 'L':
158          Append(soa.Decode<mirror::Object*>(args[args_offset].l));
159          break;
160        case 'D':
161        case 'J':
162          AppendWide(args[args_offset].j);
163          break;
164#ifndef NDEBUG
165        default:
166          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
167#endif
168      }
169    }
170  }
171
172  void BuildArgArrayFromFrame(ShadowFrame* shadow_frame, uint32_t arg_offset)
173      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
174    // Set receiver if non-null (method is not static)
175    size_t cur_arg = arg_offset;
176    if (!shadow_frame->GetMethod()->IsStatic()) {
177      Append(shadow_frame->GetVReg(cur_arg));
178      cur_arg++;
179    }
180    for (size_t i = 1; i < shorty_len_; ++i) {
181      switch (shorty_[i]) {
182        case 'Z':
183        case 'B':
184        case 'C':
185        case 'S':
186        case 'I':
187        case 'F':
188        case 'L':
189          Append(shadow_frame->GetVReg(cur_arg));
190          cur_arg++;
191          break;
192        case 'D':
193        case 'J':
194          AppendWide(shadow_frame->GetVRegLong(cur_arg));
195          cur_arg++;
196          cur_arg++;
197          break;
198#ifndef NDEBUG
199        default:
200          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
201#endif
202      }
203    }
204  }
205
206  static void ThrowIllegalPrimitiveArgumentException(const char* expected,
207                                                     const char* found_descriptor)
208      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
209    ThrowIllegalArgumentException(
210        StringPrintf("Invalid primitive conversion from %s to %s", expected,
211                     PrettyDescriptor(found_descriptor).c_str()).c_str());
212  }
213
214  bool BuildArgArrayFromObjectArray(mirror::Object* receiver,
215                                    mirror::ObjectArray<mirror::Object>* args,
216                                    Handle<mirror::ArtMethod> h_m)
217      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
218    const DexFile::TypeList* classes = h_m->GetParameterTypeList();
219    // Set receiver if non-null (method is not static)
220    if (receiver != nullptr) {
221      Append(receiver);
222    }
223    for (size_t i = 1, args_offset = 0; i < shorty_len_; ++i, ++args_offset) {
224      mirror::Object* arg = args->Get(args_offset);
225      if (((shorty_[i] == 'L') && (arg != nullptr)) || ((arg == nullptr && shorty_[i] != 'L'))) {
226        mirror::Class* dst_class =
227            h_m->GetClassFromTypeIndex(classes->GetTypeItem(args_offset).type_idx_, true);
228        if (UNLIKELY(arg == nullptr || !arg->InstanceOf(dst_class))) {
229          ThrowIllegalArgumentException(
230              StringPrintf("method %s argument %zd has type %s, got %s",
231                  PrettyMethod(h_m.Get(), false).c_str(),
232                  args_offset + 1,  // Humans don't count from 0.
233                  PrettyDescriptor(dst_class).c_str(),
234                  PrettyTypeOf(arg).c_str()).c_str());
235          return false;
236        }
237      }
238
239#define DO_FIRST_ARG(match_descriptor, get_fn, append) { \
240          if (LIKELY(arg != nullptr && arg->GetClass<>()->DescriptorEquals(match_descriptor))) { \
241            mirror::ArtField* primitive_field = arg->GetClass()->GetIFields()->Get(0); \
242            append(primitive_field-> get_fn(arg));
243
244#define DO_ARG(match_descriptor, get_fn, append) \
245          } else if (LIKELY(arg != nullptr && \
246                            arg->GetClass<>()->DescriptorEquals(match_descriptor))) { \
247            mirror::ArtField* primitive_field = arg->GetClass()->GetIFields()->Get(0); \
248            append(primitive_field-> get_fn(arg));
249
250#define DO_FAIL(expected) \
251          } else { \
252            if (arg->GetClass<>()->IsPrimitive()) { \
253              std::string temp; \
254              ThrowIllegalPrimitiveArgumentException(expected, \
255                                                     arg->GetClass<>()->GetDescriptor(&temp)); \
256            } else { \
257              ThrowIllegalArgumentException(\
258                  StringPrintf("method %s argument %zd has type %s, got %s", \
259                      PrettyMethod(h_m.Get(), false).c_str(), \
260                      args_offset + 1, \
261                      expected, \
262                      PrettyTypeOf(arg).c_str()).c_str()); \
263            } \
264            return false; \
265          } }
266
267      switch (shorty_[i]) {
268        case 'L':
269          Append(arg);
270          break;
271        case 'Z':
272          DO_FIRST_ARG("Ljava/lang/Boolean;", GetBoolean, Append)
273          DO_FAIL("boolean")
274          break;
275        case 'B':
276          DO_FIRST_ARG("Ljava/lang/Byte;", GetByte, Append)
277          DO_FAIL("byte")
278          break;
279        case 'C':
280          DO_FIRST_ARG("Ljava/lang/Character;", GetChar, Append)
281          DO_FAIL("char")
282          break;
283        case 'S':
284          DO_FIRST_ARG("Ljava/lang/Short;", GetShort, Append)
285          DO_ARG("Ljava/lang/Byte;", GetByte, Append)
286          DO_FAIL("short")
287          break;
288        case 'I':
289          DO_FIRST_ARG("Ljava/lang/Integer;", GetInt, Append)
290          DO_ARG("Ljava/lang/Character;", GetChar, Append)
291          DO_ARG("Ljava/lang/Short;", GetShort, Append)
292          DO_ARG("Ljava/lang/Byte;", GetByte, Append)
293          DO_FAIL("int")
294          break;
295        case 'J':
296          DO_FIRST_ARG("Ljava/lang/Long;", GetLong, AppendWide)
297          DO_ARG("Ljava/lang/Integer;", GetInt, AppendWide)
298          DO_ARG("Ljava/lang/Character;", GetChar, AppendWide)
299          DO_ARG("Ljava/lang/Short;", GetShort, AppendWide)
300          DO_ARG("Ljava/lang/Byte;", GetByte, AppendWide)
301          DO_FAIL("long")
302          break;
303        case 'F':
304          DO_FIRST_ARG("Ljava/lang/Float;", GetFloat, AppendFloat)
305          DO_ARG("Ljava/lang/Long;", GetLong, AppendFloat)
306          DO_ARG("Ljava/lang/Integer;", GetInt, AppendFloat)
307          DO_ARG("Ljava/lang/Character;", GetChar, AppendFloat)
308          DO_ARG("Ljava/lang/Short;", GetShort, AppendFloat)
309          DO_ARG("Ljava/lang/Byte;", GetByte, AppendFloat)
310          DO_FAIL("float")
311          break;
312        case 'D':
313          DO_FIRST_ARG("Ljava/lang/Double;", GetDouble, AppendDouble)
314          DO_ARG("Ljava/lang/Float;", GetFloat, AppendDouble)
315          DO_ARG("Ljava/lang/Long;", GetLong, AppendDouble)
316          DO_ARG("Ljava/lang/Integer;", GetInt, AppendDouble)
317          DO_ARG("Ljava/lang/Character;", GetChar, AppendDouble)
318          DO_ARG("Ljava/lang/Short;", GetShort, AppendDouble)
319          DO_ARG("Ljava/lang/Byte;", GetByte, AppendDouble)
320          DO_FAIL("double")
321          break;
322#ifndef NDEBUG
323        default:
324          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
325          UNREACHABLE();
326#endif
327      }
328#undef DO_FIRST_ARG
329#undef DO_ARG
330#undef DO_FAIL
331    }
332    return true;
333  }
334
335 private:
336  enum { kSmallArgArraySize = 16 };
337  const char* const shorty_;
338  const uint32_t shorty_len_;
339  uint32_t num_bytes_;
340  uint32_t* arg_array_;
341  uint32_t small_arg_array_[kSmallArgArraySize];
342  std::unique_ptr<uint32_t[]> large_arg_array_;
343};
344
345static void CheckMethodArguments(JavaVMExt* vm, mirror::ArtMethod* m, uint32_t* args)
346    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
347  const DexFile::TypeList* params = m->GetParameterTypeList();
348  if (params == nullptr) {
349    return;  // No arguments so nothing to check.
350  }
351  uint32_t offset = 0;
352  uint32_t num_params = params->Size();
353  size_t error_count = 0;
354  if (!m->IsStatic()) {
355    offset = 1;
356  }
357  // TODO: If args contain object references, it may cause problems.
358  Thread* self = Thread::Current();
359  StackHandleScope<1> hs(self);
360  Handle<mirror::ArtMethod> h_m(hs.NewHandle(m));
361  for (uint32_t i = 0; i < num_params; i++) {
362    uint16_t type_idx = params->GetTypeItem(i).type_idx_;
363    mirror::Class* param_type = h_m->GetClassFromTypeIndex(type_idx, true);
364    if (param_type == nullptr) {
365      CHECK(self->IsExceptionPending());
366      LOG(ERROR) << "Internal error: unresolvable type for argument type in JNI invoke: "
367          << h_m->GetTypeDescriptorFromTypeIdx(type_idx) << "\n"
368          << self->GetException()->Dump();
369      self->ClearException();
370      ++error_count;
371    } else if (!param_type->IsPrimitive()) {
372      // TODO: There is a compaction bug here since GetClassFromTypeIdx can cause thread suspension,
373      // this is a hard to fix problem since the args can contain Object*, we need to save and
374      // restore them by using a visitor similar to the ones used in the trampoline entrypoints.
375      mirror::Object* argument =
376          (reinterpret_cast<StackReference<mirror::Object>*>(&args[i + offset]))->AsMirrorPtr();
377      if (argument != nullptr && !argument->InstanceOf(param_type)) {
378        LOG(ERROR) << "JNI ERROR (app bug): attempt to pass an instance of "
379                   << PrettyTypeOf(argument) << " as argument " << (i + 1)
380                   << " to " << PrettyMethod(h_m.Get());
381        ++error_count;
382      }
383    } else if (param_type->IsPrimitiveLong() || param_type->IsPrimitiveDouble()) {
384      offset++;
385    } else {
386      int32_t arg = static_cast<int32_t>(args[i + offset]);
387      if (param_type->IsPrimitiveBoolean()) {
388        if (arg != JNI_TRUE && arg != JNI_FALSE) {
389          LOG(ERROR) << "JNI ERROR (app bug): expected jboolean (0/1) but got value of "
390              << arg << " as argument " << (i + 1) << " to " << PrettyMethod(h_m.Get());
391          ++error_count;
392        }
393      } else if (param_type->IsPrimitiveByte()) {
394        if (arg < -128 || arg > 127) {
395          LOG(ERROR) << "JNI ERROR (app bug): expected jbyte but got value of "
396              << arg << " as argument " << (i + 1) << " to " << PrettyMethod(h_m.Get());
397          ++error_count;
398        }
399      } else if (param_type->IsPrimitiveChar()) {
400        if (args[i + offset] > 0xFFFF) {
401          LOG(ERROR) << "JNI ERROR (app bug): expected jchar but got value of "
402              << arg << " as argument " << (i + 1) << " to " << PrettyMethod(h_m.Get());
403          ++error_count;
404        }
405      } else if (param_type->IsPrimitiveShort()) {
406        if (arg < -32768 || arg > 0x7FFF) {
407          LOG(ERROR) << "JNI ERROR (app bug): expected jshort but got value of "
408              << arg << " as argument " << (i + 1) << " to " << PrettyMethod(h_m.Get());
409          ++error_count;
410        }
411      }
412    }
413  }
414  if (UNLIKELY(error_count > 0)) {
415    // TODO: pass the JNI function name (such as "CallVoidMethodV") through so we can call JniAbort
416    // with an argument.
417    vm->JniAbortF(nullptr, "bad arguments passed to %s (see above for details)",
418                  PrettyMethod(h_m.Get()).c_str());
419  }
420}
421
422static mirror::ArtMethod* FindVirtualMethod(mirror::Object* receiver,
423                                            mirror::ArtMethod* method)
424    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
425  return receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(method);
426}
427
428
429static void InvokeWithArgArray(const ScopedObjectAccessAlreadyRunnable& soa,
430                               mirror::ArtMethod* method, ArgArray* arg_array, JValue* result,
431                               const char* shorty)
432    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
433  uint32_t* args = arg_array->GetArray();
434  if (UNLIKELY(soa.Env()->check_jni)) {
435    CheckMethodArguments(soa.Vm(), method, args);
436  }
437  method->Invoke(soa.Self(), args, arg_array->GetNumBytes(), result, shorty);
438}
439
440JValue InvokeWithVarArgs(const ScopedObjectAccessAlreadyRunnable& soa, jobject obj, jmethodID mid,
441                         va_list args)
442    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
443  // We want to make sure that the stack is not within a small distance from the
444  // protected region in case we are calling into a leaf function whose stack
445  // check has been elided.
446  if (UNLIKELY(__builtin_frame_address(0) < soa.Self()->GetStackEnd())) {
447    ThrowStackOverflowError(soa.Self());
448    return JValue();
449  }
450
451  mirror::ArtMethod* method = soa.DecodeMethod(mid);
452  mirror::Object* receiver = method->IsStatic() ? nullptr : soa.Decode<mirror::Object*>(obj);
453  uint32_t shorty_len = 0;
454  const char* shorty = method->GetShorty(&shorty_len);
455  JValue result;
456  ArgArray arg_array(shorty, shorty_len);
457  arg_array.BuildArgArrayFromVarArgs(soa, receiver, args);
458  InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
459  return result;
460}
461
462JValue InvokeWithJValues(const ScopedObjectAccessAlreadyRunnable& soa, mirror::Object* receiver,
463                         jmethodID mid, jvalue* args) {
464  // We want to make sure that the stack is not within a small distance from the
465  // protected region in case we are calling into a leaf function whose stack
466  // check has been elided.
467  if (UNLIKELY(__builtin_frame_address(0) < soa.Self()->GetStackEnd())) {
468    ThrowStackOverflowError(soa.Self());
469    return JValue();
470  }
471
472  mirror::ArtMethod* method = soa.DecodeMethod(mid);
473  uint32_t shorty_len = 0;
474  const char* shorty = method->GetShorty(&shorty_len);
475  JValue result;
476  ArgArray arg_array(shorty, shorty_len);
477  arg_array.BuildArgArrayFromJValues(soa, receiver, args);
478  InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
479  return result;
480}
481
482JValue InvokeVirtualOrInterfaceWithJValues(const ScopedObjectAccessAlreadyRunnable& soa,
483                                           mirror::Object* receiver, jmethodID mid, jvalue* args) {
484  // We want to make sure that the stack is not within a small distance from the
485  // protected region in case we are calling into a leaf function whose stack
486  // check has been elided.
487  if (UNLIKELY(__builtin_frame_address(0) < soa.Self()->GetStackEnd())) {
488    ThrowStackOverflowError(soa.Self());
489    return JValue();
490  }
491
492  mirror::ArtMethod* method = FindVirtualMethod(receiver, soa.DecodeMethod(mid));
493  uint32_t shorty_len = 0;
494  const char* shorty = method->GetShorty(&shorty_len);
495  JValue result;
496  ArgArray arg_array(shorty, shorty_len);
497  arg_array.BuildArgArrayFromJValues(soa, receiver, args);
498  InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
499  return result;
500}
501
502JValue InvokeVirtualOrInterfaceWithVarArgs(const ScopedObjectAccessAlreadyRunnable& soa,
503                                           jobject obj, jmethodID mid, va_list 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  uint32_t shorty_len = 0;
515  const char* shorty = method->GetShorty(&shorty_len);
516  JValue result;
517  ArgArray arg_array(shorty, shorty_len);
518  arg_array.BuildArgArrayFromVarArgs(soa, receiver, args);
519  InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
520  return result;
521}
522
523void InvokeWithShadowFrame(Thread* self, ShadowFrame* shadow_frame, uint16_t arg_offset,
524                           JValue* result) {
525  // We want to make sure that the stack is not within a small distance from the
526  // protected region in case we are calling into a leaf function whose stack
527  // check has been elided.
528  if (UNLIKELY(__builtin_frame_address(0) < self->GetStackEnd())) {
529    ThrowStackOverflowError(self);
530    return;
531  }
532  uint32_t shorty_len;
533  const char* shorty = shadow_frame->GetMethod()->GetShorty(&shorty_len);
534  ArgArray arg_array(shorty, shorty_len);
535  arg_array.BuildArgArrayFromFrame(shadow_frame, arg_offset);
536  shadow_frame->GetMethod()->Invoke(self, arg_array.GetArray(), arg_array.GetNumBytes(), result,
537                                    shorty);
538}
539
540jobject InvokeMethod(const ScopedObjectAccessAlreadyRunnable& soa, jobject javaMethod,
541                     jobject javaReceiver, jobject javaArgs, bool accessible) {
542  // We want to make sure that the stack is not within a small distance from the
543  // protected region in case we are calling into a leaf function whose stack
544  // check has been elided.
545  if (UNLIKELY(__builtin_frame_address(0) <
546               soa.Self()->GetStackEndForInterpreter(true))) {
547    ThrowStackOverflowError(soa.Self());
548    return nullptr;
549  }
550
551  mirror::ArtMethod* m = mirror::ArtMethod::FromReflectedMethod(soa, javaMethod);
552
553  mirror::Class* declaring_class = m->GetDeclaringClass();
554  if (UNLIKELY(!declaring_class->IsInitialized())) {
555    StackHandleScope<1> hs(soa.Self());
556    Handle<mirror::Class> h_class(hs.NewHandle(declaring_class));
557    if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(soa.Self(), h_class, true, true)) {
558      return nullptr;
559    }
560    declaring_class = h_class.Get();
561  }
562
563  mirror::Object* receiver = nullptr;
564  if (!m->IsStatic()) {
565    // Check that the receiver is non-null and an instance of the field's declaring class.
566    receiver = soa.Decode<mirror::Object*>(javaReceiver);
567    if (!VerifyObjectIsClass(receiver, declaring_class)) {
568      return nullptr;
569    }
570
571    // Find the actual implementation of the virtual method.
572    m = receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(m);
573  }
574
575  // Get our arrays of arguments and their types, and check they're the same size.
576  mirror::ObjectArray<mirror::Object>* objects =
577      soa.Decode<mirror::ObjectArray<mirror::Object>*>(javaArgs);
578  const DexFile::TypeList* classes = m->GetParameterTypeList();
579  uint32_t classes_size = (classes == nullptr) ? 0 : classes->Size();
580  uint32_t arg_count = (objects != nullptr) ? objects->GetLength() : 0;
581  if (arg_count != classes_size) {
582    ThrowIllegalArgumentException(StringPrintf("Wrong number of arguments; expected %d, got %d",
583                                               classes_size, arg_count).c_str());
584    return nullptr;
585  }
586
587  // If method is not set to be accessible, verify it can be accessed by the caller.
588  mirror::Class* calling_class = nullptr;
589  if (!accessible && !VerifyAccess(soa.Self(), receiver, declaring_class, m->GetAccessFlags(),
590                                   &calling_class, 2)) {
591    ThrowIllegalAccessException(
592        StringPrintf("Class %s cannot access %s method %s of class %s",
593            calling_class == nullptr ? "null" : PrettyClass(calling_class).c_str(),
594            PrettyJavaAccessFlags(m->GetAccessFlags()).c_str(),
595            PrettyMethod(m).c_str(),
596            m->GetDeclaringClass() == nullptr ? "null" :
597                PrettyClass(m->GetDeclaringClass()).c_str()).c_str());
598    return nullptr;
599  }
600
601  // Invoke the method.
602  JValue result;
603  uint32_t shorty_len = 0;
604  const char* shorty = m->GetShorty(&shorty_len);
605  ArgArray arg_array(shorty, shorty_len);
606  StackHandleScope<1> hs(soa.Self());
607  Handle<mirror::ArtMethod> h_m(hs.NewHandle(m));
608  if (!arg_array.BuildArgArrayFromObjectArray(receiver, objects, h_m)) {
609    CHECK(soa.Self()->IsExceptionPending());
610    return nullptr;
611  }
612
613  InvokeWithArgArray(soa, m, &arg_array, &result, shorty);
614
615  // Wrap any exception with "Ljava/lang/reflect/InvocationTargetException;" and return early.
616  if (soa.Self()->IsExceptionPending()) {
617    jthrowable th = soa.Env()->ExceptionOccurred();
618    soa.Env()->ExceptionClear();
619    jclass exception_class = soa.Env()->FindClass("java/lang/reflect/InvocationTargetException");
620    jmethodID mid = soa.Env()->GetMethodID(exception_class, "<init>", "(Ljava/lang/Throwable;)V");
621    jobject exception_instance = soa.Env()->NewObject(exception_class, mid, th);
622    soa.Env()->Throw(reinterpret_cast<jthrowable>(exception_instance));
623    return nullptr;
624  }
625
626  // Box if necessary and return.
627  return soa.AddLocalReference<jobject>(BoxPrimitive(Primitive::GetType(shorty[0]), result));
628}
629
630mirror::Object* BoxPrimitive(Primitive::Type src_class, const JValue& value) {
631  if (src_class == Primitive::kPrimNot) {
632    return value.GetL();
633  }
634  if (src_class == Primitive::kPrimVoid) {
635    // There's no such thing as a void field, and void methods invoked via reflection return null.
636    return nullptr;
637  }
638
639  jmethodID m = nullptr;
640  const char* shorty;
641  switch (src_class) {
642  case Primitive::kPrimBoolean:
643    m = WellKnownClasses::java_lang_Boolean_valueOf;
644    shorty = "LZ";
645    break;
646  case Primitive::kPrimByte:
647    m = WellKnownClasses::java_lang_Byte_valueOf;
648    shorty = "LB";
649    break;
650  case Primitive::kPrimChar:
651    m = WellKnownClasses::java_lang_Character_valueOf;
652    shorty = "LC";
653    break;
654  case Primitive::kPrimDouble:
655    m = WellKnownClasses::java_lang_Double_valueOf;
656    shorty = "LD";
657    break;
658  case Primitive::kPrimFloat:
659    m = WellKnownClasses::java_lang_Float_valueOf;
660    shorty = "LF";
661    break;
662  case Primitive::kPrimInt:
663    m = WellKnownClasses::java_lang_Integer_valueOf;
664    shorty = "LI";
665    break;
666  case Primitive::kPrimLong:
667    m = WellKnownClasses::java_lang_Long_valueOf;
668    shorty = "LJ";
669    break;
670  case Primitive::kPrimShort:
671    m = WellKnownClasses::java_lang_Short_valueOf;
672    shorty = "LS";
673    break;
674  default:
675    LOG(FATAL) << static_cast<int>(src_class);
676    shorty = nullptr;
677  }
678
679  ScopedObjectAccessUnchecked soa(Thread::Current());
680  DCHECK_EQ(soa.Self()->GetState(), kRunnable);
681
682  ArgArray arg_array(shorty, 2);
683  JValue result;
684  if (src_class == Primitive::kPrimDouble || src_class == Primitive::kPrimLong) {
685    arg_array.AppendWide(value.GetJ());
686  } else {
687    arg_array.Append(value.GetI());
688  }
689
690  soa.DecodeMethod(m)->Invoke(soa.Self(), arg_array.GetArray(), arg_array.GetNumBytes(),
691                              &result, shorty);
692  return result.GetL();
693}
694
695static std::string UnboxingFailureKind(mirror::ArtField* f)
696    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
697  if (f != nullptr) {
698    return "field " + PrettyField(f, false);
699  }
700  return "result";
701}
702
703static bool UnboxPrimitive(mirror::Object* o,
704                           mirror::Class* dst_class, mirror::ArtField* f,
705                           JValue* unboxed_value)
706    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
707  bool unbox_for_result = (f == nullptr);
708  if (!dst_class->IsPrimitive()) {
709    if (UNLIKELY(o != nullptr && !o->InstanceOf(dst_class))) {
710      if (!unbox_for_result) {
711        ThrowIllegalArgumentException(StringPrintf("%s has type %s, got %s",
712                                                   UnboxingFailureKind(f).c_str(),
713                                                   PrettyDescriptor(dst_class).c_str(),
714                                                   PrettyTypeOf(o).c_str()).c_str());
715      } else {
716        ThrowClassCastException(StringPrintf("Couldn't convert result of type %s to %s",
717                                             PrettyTypeOf(o).c_str(),
718                                             PrettyDescriptor(dst_class).c_str()).c_str());
719      }
720      return false;
721    }
722    unboxed_value->SetL(o);
723    return true;
724  }
725  if (UNLIKELY(dst_class->GetPrimitiveType() == Primitive::kPrimVoid)) {
726    ThrowIllegalArgumentException(StringPrintf("Can't unbox %s to void",
727                                               UnboxingFailureKind(f).c_str()).c_str());
728    return false;
729  }
730  if (UNLIKELY(o == nullptr)) {
731    if (!unbox_for_result) {
732      ThrowIllegalArgumentException(StringPrintf("%s has type %s, got null",
733                                                 UnboxingFailureKind(f).c_str(),
734                                                 PrettyDescriptor(dst_class).c_str()).c_str());
735    } else {
736      ThrowNullPointerException(StringPrintf("Expected to unbox a '%s' primitive type but was returned null",
737                                             PrettyDescriptor(dst_class).c_str()).c_str());
738    }
739    return false;
740  }
741
742  JValue boxed_value;
743  mirror::Class* klass = o->GetClass();
744  mirror::Class* src_class = nullptr;
745  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
746  mirror::ArtField* primitive_field = o->GetClass()->GetIFields()->Get(0);
747  if (klass->DescriptorEquals("Ljava/lang/Boolean;")) {
748    src_class = class_linker->FindPrimitiveClass('Z');
749    boxed_value.SetZ(primitive_field->GetBoolean(o));
750  } else if (klass->DescriptorEquals("Ljava/lang/Byte;")) {
751    src_class = class_linker->FindPrimitiveClass('B');
752    boxed_value.SetB(primitive_field->GetByte(o));
753  } else if (klass->DescriptorEquals("Ljava/lang/Character;")) {
754    src_class = class_linker->FindPrimitiveClass('C');
755    boxed_value.SetC(primitive_field->GetChar(o));
756  } else if (klass->DescriptorEquals("Ljava/lang/Float;")) {
757    src_class = class_linker->FindPrimitiveClass('F');
758    boxed_value.SetF(primitive_field->GetFloat(o));
759  } else if (klass->DescriptorEquals("Ljava/lang/Double;")) {
760    src_class = class_linker->FindPrimitiveClass('D');
761    boxed_value.SetD(primitive_field->GetDouble(o));
762  } else if (klass->DescriptorEquals("Ljava/lang/Integer;")) {
763    src_class = class_linker->FindPrimitiveClass('I');
764    boxed_value.SetI(primitive_field->GetInt(o));
765  } else if (klass->DescriptorEquals("Ljava/lang/Long;")) {
766    src_class = class_linker->FindPrimitiveClass('J');
767    boxed_value.SetJ(primitive_field->GetLong(o));
768  } else if (klass->DescriptorEquals("Ljava/lang/Short;")) {
769    src_class = class_linker->FindPrimitiveClass('S');
770    boxed_value.SetS(primitive_field->GetShort(o));
771  } else {
772    std::string temp;
773    ThrowIllegalArgumentException(
774        StringPrintf("%s has type %s, got %s", UnboxingFailureKind(f).c_str(),
775            PrettyDescriptor(dst_class).c_str(),
776            PrettyDescriptor(o->GetClass()->GetDescriptor(&temp)).c_str()).c_str());
777    return false;
778  }
779
780  return ConvertPrimitiveValue(unbox_for_result,
781                               src_class->GetPrimitiveType(), dst_class->GetPrimitiveType(),
782                               boxed_value, unboxed_value);
783}
784
785bool UnboxPrimitiveForField(mirror::Object* o, mirror::Class* dst_class, mirror::ArtField* f,
786                            JValue* unboxed_value) {
787  DCHECK(f != nullptr);
788  return UnboxPrimitive(o, dst_class, f, unboxed_value);
789}
790
791bool UnboxPrimitiveForResult(mirror::Object* o,
792                             mirror::Class* dst_class, JValue* unboxed_value) {
793  return UnboxPrimitive(o, dst_class, nullptr, unboxed_value);
794}
795
796bool VerifyAccess(Thread* self, mirror::Object* obj, mirror::Class* declaring_class,
797                  uint32_t access_flags, mirror::Class** calling_class, size_t num_frames) {
798  if ((access_flags & kAccPublic) != 0) {
799    return true;
800  }
801  NthCallerVisitor visitor(self, num_frames);
802  visitor.WalkStack();
803  if (UNLIKELY(visitor.caller == nullptr)) {
804    // The caller is an attached native thread.
805    return false;
806  }
807  mirror::Class* caller_class = visitor.caller->GetDeclaringClass();
808  if (caller_class == declaring_class) {
809    return true;
810  }
811  ScopedAssertNoThreadSuspension sants(self, "verify-access");
812  *calling_class = caller_class;
813  if ((access_flags & kAccPrivate) != 0) {
814    return false;
815  }
816  if ((access_flags & kAccProtected) != 0) {
817    if (obj != nullptr && !obj->InstanceOf(caller_class) &&
818        !declaring_class->IsInSamePackage(caller_class)) {
819      return false;
820    } else if (declaring_class->IsAssignableFrom(caller_class)) {
821      return true;
822    }
823  }
824  return declaring_class->IsInSamePackage(caller_class);
825}
826
827void InvalidReceiverError(mirror::Object* o, mirror::Class* c) {
828  std::string expected_class_name(PrettyDescriptor(c));
829  std::string actual_class_name(PrettyTypeOf(o));
830  ThrowIllegalArgumentException(StringPrintf("Expected receiver of type %s, but got %s",
831                                             expected_class_name.c_str(),
832                                             actual_class_name.c_str()).c_str());
833}
834
835}  // namespace art
836