reflection.cc revision 2b7c4d196c8abe32f4ca633534917da9de53c359 
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.h"
18
19#include "class_linker.h"
20#include "common_throws.h"
21#include "dex_file-inl.h"
22#include "jni_internal.h"
23#include "mirror/art_field-inl.h"
24#include "mirror/art_method-inl.h"
25#include "mirror/class.h"
26#include "mirror/class-inl.h"
27#include "mirror/object_array.h"
28#include "mirror/object_array-inl.h"
29#include "nth_caller_visitor.h"
30#include "object_utils.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    // For ARM and MIPS portable, align wide values to 8 bytes (ArgArray starts at offset of 4).
81#if defined(ART_USE_PORTABLE_COMPILER) && (defined(__arm__) || defined(__mips__))
82    if (num_bytes_ % 8 == 0) {
83      num_bytes_ += 4;
84    }
85#endif
86    arg_array_[num_bytes_ / 4] = value;
87    arg_array_[(num_bytes_ / 4) + 1] = value >> 32;
88    num_bytes_ += 8;
89  }
90
91  void AppendFloat(float value) {
92    jvalue jv;
93    jv.f = value;
94    Append(jv.i);
95  }
96
97  void AppendDouble(double value) {
98    jvalue jv;
99    jv.d = value;
100    AppendWide(jv.j);
101  }
102
103  void BuildArgArrayFromVarArgs(const ScopedObjectAccessAlreadyRunnable& soa,
104                                mirror::Object* receiver, va_list ap)
105      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
106    // Set receiver if non-null (method is not static)
107    if (receiver != nullptr) {
108      Append(receiver);
109    }
110    for (size_t i = 1; i < shorty_len_; ++i) {
111      switch (shorty_[i]) {
112        case 'Z':
113        case 'B':
114        case 'C':
115        case 'S':
116        case 'I':
117          Append(va_arg(ap, jint));
118          break;
119        case 'F':
120          AppendFloat(va_arg(ap, jdouble));
121          break;
122        case 'L':
123          Append(soa.Decode<mirror::Object*>(va_arg(ap, jobject)));
124          break;
125        case 'D':
126          AppendDouble(va_arg(ap, jdouble));
127          break;
128        case 'J':
129          AppendWide(va_arg(ap, jlong));
130          break;
131#ifndef NDEBUG
132        default:
133          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
134#endif
135      }
136    }
137  }
138
139  void BuildArgArrayFromJValues(const ScopedObjectAccessAlreadyRunnable& soa,
140                                mirror::Object* receiver, jvalue* args)
141      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
142    // Set receiver if non-null (method is not static)
143    if (receiver != nullptr) {
144      Append(receiver);
145    }
146    for (size_t i = 1, args_offset = 0; i < shorty_len_; ++i, ++args_offset) {
147      switch (shorty_[i]) {
148        case 'Z':
149          Append(args[args_offset].z);
150          break;
151        case 'B':
152          Append(args[args_offset].b);
153          break;
154        case 'C':
155          Append(args[args_offset].c);
156          break;
157        case 'S':
158          Append(args[args_offset].s);
159          break;
160        case 'I':
161        case 'F':
162          Append(args[args_offset].i);
163          break;
164        case 'L':
165          Append(soa.Decode<mirror::Object*>(args[args_offset].l));
166          break;
167        case 'D':
168        case 'J':
169          AppendWide(args[args_offset].j);
170          break;
171#ifndef NDEBUG
172        default:
173          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
174#endif
175      }
176    }
177  }
178
179  void BuildArgArrayFromFrame(ShadowFrame* shadow_frame, uint32_t arg_offset)
180      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
181    // Set receiver if non-null (method is not static)
182    size_t cur_arg = arg_offset;
183    if (!shadow_frame->GetMethod()->IsStatic()) {
184      Append(shadow_frame->GetVReg(cur_arg));
185      cur_arg++;
186    }
187    for (size_t i = 1; i < shorty_len_; ++i) {
188      switch (shorty_[i]) {
189        case 'Z':
190        case 'B':
191        case 'C':
192        case 'S':
193        case 'I':
194        case 'F':
195        case 'L':
196          Append(shadow_frame->GetVReg(cur_arg));
197          cur_arg++;
198          break;
199        case 'D':
200        case 'J':
201          AppendWide(shadow_frame->GetVRegLong(cur_arg));
202          cur_arg++;
203          cur_arg++;
204          break;
205#ifndef NDEBUG
206        default:
207          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
208#endif
209      }
210    }
211  }
212
213  static void ThrowIllegalPrimitiveArgumentException(const char* expected,
214                                                     const StringPiece& found_descriptor)
215      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
216    ThrowIllegalArgumentException(nullptr,
217        StringPrintf("Invalid primitive conversion from %s to %s", expected,
218                     PrettyDescriptor(found_descriptor.as_string()).c_str()).c_str());
219  }
220
221  bool BuildArgArrayFromObjectArray(const ScopedObjectAccessAlreadyRunnable& soa,
222                                    mirror::Object* receiver,
223                                    mirror::ObjectArray<mirror::Object>* args, MethodHelper& mh)
224      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
225    const DexFile::TypeList* classes = mh.GetParameterTypeList();
226    // Set receiver if non-null (method is not static)
227    if (receiver != nullptr) {
228      Append(receiver);
229    }
230    for (size_t i = 1, args_offset = 0; i < shorty_len_; ++i, ++args_offset) {
231      mirror::Object* arg = args->Get(args_offset);
232      if (((shorty_[i] == 'L') && (arg != nullptr)) || ((arg == nullptr && shorty_[i] != 'L'))) {
233        mirror::Class* dst_class =
234            mh.GetClassFromTypeIdx(classes->GetTypeItem(args_offset).type_idx_);
235        if (UNLIKELY(arg == nullptr || !arg->InstanceOf(dst_class))) {
236          ThrowIllegalArgumentException(nullptr,
237              StringPrintf("method %s argument %zd has type %s, got %s",
238                  PrettyMethod(mh.GetMethod(), false).c_str(),
239                  args_offset + 1,  // Humans don't count from 0.
240                  PrettyDescriptor(dst_class).c_str(),
241                  PrettyTypeOf(arg).c_str()).c_str());
242          return false;
243        }
244      }
245
246#define DO_FIRST_ARG(match_descriptor, get_fn, append) { \
247          if (LIKELY(arg != nullptr && arg->GetClass<>()->DescriptorEquals(match_descriptor))) { \
248            mirror::ArtField* primitive_field = arg->GetClass()->GetIFields()->Get(0); \
249            append(primitive_field-> get_fn(arg));
250
251#define DO_ARG(match_descriptor, get_fn, append) \
252          } else if (LIKELY(arg != nullptr && \
253                            arg->GetClass<>()->DescriptorEquals(match_descriptor))) { \
254            mirror::ArtField* primitive_field = arg->GetClass()->GetIFields()->Get(0); \
255            append(primitive_field-> get_fn(arg));
256
257#define DO_FAIL(expected) \
258          } else { \
259            if (arg->GetClass<>()->IsPrimitive()) { \
260              ThrowIllegalPrimitiveArgumentException(expected, \
261                                                     arg->GetClass<>()->GetDescriptor().c_str()); \
262            } else { \
263              ThrowIllegalArgumentException(nullptr, \
264                  StringPrintf("method %s argument %zd has type %s, got %s", \
265                      PrettyMethod(mh.GetMethod(), false).c_str(), \
266                      args_offset + 1, \
267                      expected, \
268                      PrettyTypeOf(arg).c_str()).c_str()); \
269            } \
270            return false; \
271          } }
272
273      switch (shorty_[i]) {
274        case 'L':
275          Append(arg);
276          break;
277        case 'Z':
278          DO_FIRST_ARG("Ljava/lang/Boolean;", GetBoolean, Append)
279          DO_FAIL("boolean")
280          break;
281        case 'B':
282          DO_FIRST_ARG("Ljava/lang/Byte;", GetByte, Append)
283          DO_FAIL("byte")
284          break;
285        case 'C':
286          DO_FIRST_ARG("Ljava/lang/Character;", GetChar, Append)
287          DO_FAIL("char")
288          break;
289        case 'S':
290          DO_FIRST_ARG("Ljava/lang/Short;", GetShort, Append)
291          DO_ARG("Ljava/lang/Byte;", GetByte, Append)
292          DO_FAIL("short")
293          break;
294        case 'I':
295          DO_FIRST_ARG("Ljava/lang/Integer;", GetInt, Append)
296          DO_ARG("Ljava/lang/Character;", GetChar, Append)
297          DO_ARG("Ljava/lang/Short;", GetShort, Append)
298          DO_ARG("Ljava/lang/Byte;", GetByte, Append)
299          DO_FAIL("int")
300          break;
301        case 'J':
302          DO_FIRST_ARG("Ljava/lang/Long;", GetLong, AppendWide)
303          DO_ARG("Ljava/lang/Integer;", GetInt, AppendWide)
304          DO_ARG("Ljava/lang/Character;", GetChar, AppendWide)
305          DO_ARG("Ljava/lang/Short;", GetShort, AppendWide)
306          DO_ARG("Ljava/lang/Byte;", GetByte, AppendWide)
307          DO_FAIL("long")
308          break;
309        case 'F':
310          DO_FIRST_ARG("Ljava/lang/Float;", GetFloat, AppendFloat)
311          DO_ARG("Ljava/lang/Long;", GetLong, AppendFloat)
312          DO_ARG("Ljava/lang/Integer;", GetInt, AppendFloat)
313          DO_ARG("Ljava/lang/Character;", GetChar, AppendFloat)
314          DO_ARG("Ljava/lang/Short;", GetShort, AppendFloat)
315          DO_ARG("Ljava/lang/Byte;", GetByte, AppendFloat)
316          DO_FAIL("float")
317          break;
318        case 'D':
319          DO_FIRST_ARG("Ljava/lang/Double;", GetDouble, AppendDouble)
320          DO_ARG("Ljava/lang/Float;", GetFloat, AppendDouble)
321          DO_ARG("Ljava/lang/Long;", GetLong, AppendDouble)
322          DO_ARG("Ljava/lang/Integer;", GetInt, AppendDouble)
323          DO_ARG("Ljava/lang/Character;", GetChar, AppendDouble)
324          DO_ARG("Ljava/lang/Short;", GetShort, AppendDouble)
325          DO_ARG("Ljava/lang/Byte;", GetByte, AppendDouble)
326          DO_FAIL("double")
327          break;
328#ifndef NDEBUG
329        default:
330          LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
331#endif
332      }
333#undef DO_FIRST_ARG
334#undef DO_ARG
335#undef DO_FAIL
336    }
337    return true;
338  }
339
340 private:
341  enum { kSmallArgArraySize = 16 };
342  const char* const shorty_;
343  const uint32_t shorty_len_;
344  uint32_t num_bytes_;
345  uint32_t* arg_array_;
346  uint32_t small_arg_array_[kSmallArgArraySize];
347  UniquePtr<uint32_t[]> large_arg_array_;
348};
349
350static void CheckMethodArguments(mirror::ArtMethod* m, uint32_t* args)
351    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
352  const DexFile::TypeList* params = MethodHelper(m).GetParameterTypeList();
353  if (params == nullptr) {
354    return;  // No arguments so nothing to check.
355  }
356  uint32_t offset = 0;
357  uint32_t num_params = params->Size();
358  size_t error_count = 0;
359  if (!m->IsStatic()) {
360    offset = 1;
361  }
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 = MethodHelper(m).GetClassFromTypeIdx(type_idx);
365    if (param_type == nullptr) {
366      Thread* self = Thread::Current();
367      CHECK(self->IsExceptionPending());
368      LOG(ERROR) << "Internal error: unresolvable type for argument type in JNI invoke: "
369          << MethodHelper(m).GetTypeDescriptorFromTypeIdx(type_idx) << "\n"
370          << self->GetException(nullptr)->Dump();
371      self->ClearException();
372      ++error_count;
373    } else if (!param_type->IsPrimitive()) {
374      // TODO: check primitives are in range.
375      mirror::Object* argument = reinterpret_cast<mirror::Object*>(args[i + offset]);
376      if (argument != nullptr && !argument->InstanceOf(param_type)) {
377        LOG(ERROR) << "JNI ERROR (app bug): attempt to pass an instance of "
378                   << PrettyTypeOf(argument) << " as argument " << (i + 1)
379                   << " to " << PrettyMethod(m);
380        ++error_count;
381      }
382    } else if (param_type->IsPrimitiveLong() || param_type->IsPrimitiveDouble()) {
383      offset++;
384    }
385  }
386  if (error_count > 0) {
387    // TODO: pass the JNI function name (such as "CallVoidMethodV") through so we can call JniAbort
388    // with an argument.
389    JniAbortF(nullptr, "bad arguments passed to %s (see above for details)",
390              PrettyMethod(m).c_str());
391  }
392}
393
394static mirror::ArtMethod* FindVirtualMethod(mirror::Object* receiver,
395                                            mirror::ArtMethod* method)
396    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
397  return receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(method);
398}
399
400
401static void InvokeWithArgArray(const ScopedObjectAccessAlreadyRunnable& soa,
402                               mirror::ArtMethod* method, ArgArray* arg_array, JValue* result,
403                               const char* shorty)
404    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
405  uint32_t* args = arg_array->GetArray();
406  if (UNLIKELY(soa.Env()->check_jni)) {
407    CheckMethodArguments(method, args);
408  }
409  method->Invoke(soa.Self(), args, arg_array->GetNumBytes(), result, shorty);
410}
411
412JValue InvokeWithVarArgs(const ScopedObjectAccessAlreadyRunnable& soa, jobject obj, jmethodID mid,
413                         va_list args)
414    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
415  mirror::ArtMethod* method = soa.DecodeMethod(mid);
416  mirror::Object* receiver = method->IsStatic() ? nullptr : soa.Decode<mirror::Object*>(obj);
417  MethodHelper mh(method);
418  JValue result;
419  ArgArray arg_array(mh.GetShorty(), mh.GetShortyLength());
420  arg_array.BuildArgArrayFromVarArgs(soa, receiver, args);
421  InvokeWithArgArray(soa, method, &arg_array, &result, mh.GetShorty());
422  return result;
423}
424
425JValue InvokeWithJValues(const ScopedObjectAccessAlreadyRunnable& soa, mirror::Object* receiver,
426                         jmethodID mid, jvalue* args) {
427  mirror::ArtMethod* method = soa.DecodeMethod(mid);
428  MethodHelper mh(method);
429  JValue result;
430  ArgArray arg_array(mh.GetShorty(), mh.GetShortyLength());
431  arg_array.BuildArgArrayFromJValues(soa, receiver, args);
432  InvokeWithArgArray(soa, method, &arg_array, &result, mh.GetShorty());
433  return result;
434}
435
436JValue InvokeVirtualOrInterfaceWithJValues(const ScopedObjectAccessAlreadyRunnable& soa,
437                                           mirror::Object* receiver, jmethodID mid, jvalue* args) {
438  mirror::ArtMethod* method = FindVirtualMethod(receiver, soa.DecodeMethod(mid));
439  MethodHelper mh(method);
440  JValue result;
441  ArgArray arg_array(mh.GetShorty(), mh.GetShortyLength());
442  arg_array.BuildArgArrayFromJValues(soa, receiver, args);
443  InvokeWithArgArray(soa, method, &arg_array, &result, mh.GetShorty());
444  return result;
445}
446
447JValue InvokeVirtualOrInterfaceWithVarArgs(const ScopedObjectAccessAlreadyRunnable& soa,
448                                           jobject obj, jmethodID mid, va_list args) {
449  mirror::Object* receiver = soa.Decode<mirror::Object*>(obj);
450  mirror::ArtMethod* method = FindVirtualMethod(receiver, soa.DecodeMethod(mid));
451  MethodHelper mh(method);
452  JValue result;
453  ArgArray arg_array(mh.GetShorty(), mh.GetShortyLength());
454  arg_array.BuildArgArrayFromVarArgs(soa, receiver, args);
455  InvokeWithArgArray(soa, method, &arg_array, &result, mh.GetShorty());
456  return result;
457}
458
459void InvokeWithShadowFrame(Thread* self, ShadowFrame* shadow_frame, uint16_t arg_offset,
460                           MethodHelper& mh, JValue* result) {
461  ArgArray arg_array(mh.GetShorty(), mh.GetShortyLength());
462  arg_array.BuildArgArrayFromFrame(shadow_frame, arg_offset);
463  shadow_frame->GetMethod()->Invoke(self, arg_array.GetArray(), arg_array.GetNumBytes(), result,
464                                    mh.GetShorty());
465}
466
467jobject InvokeMethod(const ScopedObjectAccessAlreadyRunnable& soa, jobject javaMethod,
468                     jobject javaReceiver, jobject javaArgs, bool accessible) {
469  mirror::ArtMethod* m = mirror::ArtMethod::FromReflectedMethod(soa, javaMethod);
470
471  mirror::Class* declaring_class = m->GetDeclaringClass();
472  if (UNLIKELY(!declaring_class->IsInitialized())) {
473    StackHandleScope<1> hs(soa.Self());
474    Handle<mirror::Class> h_class(hs.NewHandle(declaring_class));
475    if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(h_class, true, true)) {
476      return nullptr;
477    }
478    declaring_class = h_class.Get();
479  }
480
481  mirror::Object* receiver = nullptr;
482  if (!m->IsStatic()) {
483    // Check that the receiver is non-null and an instance of the field's declaring class.
484    receiver = soa.Decode<mirror::Object*>(javaReceiver);
485    if (!VerifyObjectIsClass(receiver, declaring_class)) {
486      return NULL;
487    }
488
489    // Find the actual implementation of the virtual method.
490    m = receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(m);
491  }
492
493  // Get our arrays of arguments and their types, and check they're the same size.
494  mirror::ObjectArray<mirror::Object>* objects =
495      soa.Decode<mirror::ObjectArray<mirror::Object>*>(javaArgs);
496  MethodHelper mh(m);
497  const DexFile::TypeList* classes = mh.GetParameterTypeList();
498  uint32_t classes_size = (classes == nullptr) ? 0 : classes->Size();
499  uint32_t arg_count = (objects != nullptr) ? objects->GetLength() : 0;
500  if (arg_count != classes_size) {
501    ThrowIllegalArgumentException(NULL,
502                                  StringPrintf("Wrong number of arguments; expected %d, got %d",
503                                               classes_size, arg_count).c_str());
504    return NULL;
505  }
506
507  // If method is not set to be accessible, verify it can be accessed by the caller.
508  if (!accessible && !VerifyAccess(receiver, declaring_class, m->GetAccessFlags())) {
509    ThrowIllegalAccessException(nullptr, StringPrintf("Cannot access method: %s",
510                                                      PrettyMethod(m).c_str()).c_str());
511    return nullptr;
512  }
513
514  // Invoke the method.
515  JValue result;
516  ArgArray arg_array(mh.GetShorty(), mh.GetShortyLength());
517  if (!arg_array.BuildArgArrayFromObjectArray(soa, receiver, objects, mh)) {
518    CHECK(soa.Self()->IsExceptionPending());
519    return nullptr;
520  }
521
522  InvokeWithArgArray(soa, m, &arg_array, &result, mh.GetShorty());
523
524  // Wrap any exception with "Ljava/lang/reflect/InvocationTargetException;" and return early.
525  if (soa.Self()->IsExceptionPending()) {
526    jthrowable th = soa.Env()->ExceptionOccurred();
527    soa.Env()->ExceptionClear();
528    jclass exception_class = soa.Env()->FindClass("java/lang/reflect/InvocationTargetException");
529    jmethodID mid = soa.Env()->GetMethodID(exception_class, "<init>", "(Ljava/lang/Throwable;)V");
530    jobject exception_instance = soa.Env()->NewObject(exception_class, mid, th);
531    soa.Env()->Throw(reinterpret_cast<jthrowable>(exception_instance));
532    return NULL;
533  }
534
535  // Box if necessary and return.
536  return soa.AddLocalReference<jobject>(BoxPrimitive(mh.GetReturnType()->GetPrimitiveType(),
537                                                     result));
538}
539
540bool VerifyObjectIsClass(mirror::Object* o, mirror::Class* c) {
541  if (o == NULL) {
542    ThrowNullPointerException(NULL, "null receiver");
543    return false;
544  } else if (!o->InstanceOf(c)) {
545    std::string expected_class_name(PrettyDescriptor(c));
546    std::string actual_class_name(PrettyTypeOf(o));
547    ThrowIllegalArgumentException(NULL,
548                                  StringPrintf("Expected receiver of type %s, but got %s",
549                                               expected_class_name.c_str(),
550                                               actual_class_name.c_str()).c_str());
551    return false;
552  }
553  return true;
554}
555
556bool ConvertPrimitiveValue(const ThrowLocation* throw_location, bool unbox_for_result,
557                           Primitive::Type srcType, Primitive::Type dstType,
558                           const JValue& src, JValue* dst) {
559  DCHECK(srcType != Primitive::kPrimNot && dstType != Primitive::kPrimNot);
560  if (LIKELY(srcType == dstType)) {
561    dst->SetJ(src.GetJ());
562    return true;
563  }
564  switch (dstType) {
565  case Primitive::kPrimBoolean:  // Fall-through.
566  case Primitive::kPrimChar:  // Fall-through.
567  case Primitive::kPrimByte:
568    // Only expect assignment with source and destination of identical type.
569    break;
570  case Primitive::kPrimShort:
571    if (srcType == Primitive::kPrimByte) {
572      dst->SetS(src.GetI());
573      return true;
574    }
575    break;
576  case Primitive::kPrimInt:
577    if (srcType == Primitive::kPrimByte || srcType == Primitive::kPrimChar ||
578        srcType == Primitive::kPrimShort) {
579      dst->SetI(src.GetI());
580      return true;
581    }
582    break;
583  case Primitive::kPrimLong:
584    if (srcType == Primitive::kPrimByte || srcType == Primitive::kPrimChar ||
585        srcType == Primitive::kPrimShort || srcType == Primitive::kPrimInt) {
586      dst->SetJ(src.GetI());
587      return true;
588    }
589    break;
590  case Primitive::kPrimFloat:
591    if (srcType == Primitive::kPrimByte || srcType == Primitive::kPrimChar ||
592        srcType == Primitive::kPrimShort || srcType == Primitive::kPrimInt) {
593      dst->SetF(src.GetI());
594      return true;
595    } else if (srcType == Primitive::kPrimLong) {
596      dst->SetF(src.GetJ());
597      return true;
598    }
599    break;
600  case Primitive::kPrimDouble:
601    if (srcType == Primitive::kPrimByte || srcType == Primitive::kPrimChar ||
602        srcType == Primitive::kPrimShort || srcType == Primitive::kPrimInt) {
603      dst->SetD(src.GetI());
604      return true;
605    } else if (srcType == Primitive::kPrimLong) {
606      dst->SetD(src.GetJ());
607      return true;
608    } else if (srcType == Primitive::kPrimFloat) {
609      dst->SetD(src.GetF());
610      return true;
611    }
612    break;
613  default:
614    break;
615  }
616  if (!unbox_for_result) {
617    ThrowIllegalArgumentException(throw_location,
618                                  StringPrintf("Invalid primitive conversion from %s to %s",
619                                               PrettyDescriptor(srcType).c_str(),
620                                               PrettyDescriptor(dstType).c_str()).c_str());
621  } else {
622    ThrowClassCastException(throw_location,
623                            StringPrintf("Couldn't convert result of type %s to %s",
624                                         PrettyDescriptor(srcType).c_str(),
625                                         PrettyDescriptor(dstType).c_str()).c_str());
626  }
627  return false;
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(const ThrowLocation* throw_location, 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(throw_location,
712                                      StringPrintf("%s has type %s, got %s",
713                                                   UnboxingFailureKind(f).c_str(),
714                                                   PrettyDescriptor(dst_class).c_str(),
715                                                   PrettyTypeOf(o).c_str()).c_str());
716      } else {
717        ThrowClassCastException(throw_location,
718                                StringPrintf("Couldn't convert result of type %s to %s",
719                                             PrettyTypeOf(o).c_str(),
720                                             PrettyDescriptor(dst_class).c_str()).c_str());
721      }
722      return false;
723    }
724    unboxed_value->SetL(o);
725    return true;
726  }
727  if (UNLIKELY(dst_class->GetPrimitiveType() == Primitive::kPrimVoid)) {
728    ThrowIllegalArgumentException(throw_location,
729                                  StringPrintf("Can't unbox %s to void",
730                                               UnboxingFailureKind(f).c_str()).c_str());
731    return false;
732  }
733  if (UNLIKELY(o == nullptr)) {
734    if (!unbox_for_result) {
735      ThrowIllegalArgumentException(throw_location,
736                                    StringPrintf("%s has type %s, got null",
737                                                 UnboxingFailureKind(f).c_str(),
738                                                 PrettyDescriptor(dst_class).c_str()).c_str());
739    } else {
740      ThrowNullPointerException(throw_location,
741                                StringPrintf("Expected to unbox a '%s' primitive type but was returned null",
742                                             PrettyDescriptor(dst_class).c_str()).c_str());
743    }
744    return false;
745  }
746
747  JValue boxed_value;
748  mirror::Class* klass = o->GetClass();
749  mirror::Class* src_class = nullptr;
750  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
751  mirror::ArtField* primitive_field = o->GetClass()->GetIFields()->Get(0);
752  if (klass->DescriptorEquals("Ljava/lang/Boolean;")) {
753    src_class = class_linker->FindPrimitiveClass('Z');
754    boxed_value.SetZ(primitive_field->GetBoolean(o));
755  } else if (klass->DescriptorEquals("Ljava/lang/Byte;")) {
756    src_class = class_linker->FindPrimitiveClass('B');
757    boxed_value.SetB(primitive_field->GetByte(o));
758  } else if (klass->DescriptorEquals("Ljava/lang/Character;")) {
759    src_class = class_linker->FindPrimitiveClass('C');
760    boxed_value.SetC(primitive_field->GetChar(o));
761  } else if (klass->DescriptorEquals("Ljava/lang/Float;")) {
762    src_class = class_linker->FindPrimitiveClass('F');
763    boxed_value.SetF(primitive_field->GetFloat(o));
764  } else if (klass->DescriptorEquals("Ljava/lang/Double;")) {
765    src_class = class_linker->FindPrimitiveClass('D');
766    boxed_value.SetD(primitive_field->GetDouble(o));
767  } else if (klass->DescriptorEquals("Ljava/lang/Integer;")) {
768    src_class = class_linker->FindPrimitiveClass('I');
769    boxed_value.SetI(primitive_field->GetInt(o));
770  } else if (klass->DescriptorEquals("Ljava/lang/Long;")) {
771    src_class = class_linker->FindPrimitiveClass('J');
772    boxed_value.SetJ(primitive_field->GetLong(o));
773  } else if (klass->DescriptorEquals("Ljava/lang/Short;")) {
774    src_class = class_linker->FindPrimitiveClass('S');
775    boxed_value.SetS(primitive_field->GetShort(o));
776  } else {
777    ThrowIllegalArgumentException(throw_location,
778                                  StringPrintf("%s has type %s, got %s",
779                                               UnboxingFailureKind(f).c_str(),
780                                               PrettyDescriptor(dst_class).c_str(),
781                                               PrettyDescriptor(o->GetClass()->GetDescriptor()).c_str()).c_str());
782    return false;
783  }
784
785  return ConvertPrimitiveValue(throw_location, unbox_for_result,
786                               src_class->GetPrimitiveType(), dst_class->GetPrimitiveType(),
787                               boxed_value, unboxed_value);
788}
789
790bool UnboxPrimitiveForField(mirror::Object* o, mirror::Class* dst_class, mirror::ArtField* f,
791                            JValue* unboxed_value) {
792  DCHECK(f != nullptr);
793  return UnboxPrimitive(nullptr, o, dst_class, f, unboxed_value);
794}
795
796bool UnboxPrimitiveForResult(const ThrowLocation& throw_location, mirror::Object* o,
797                             mirror::Class* dst_class, JValue* unboxed_value) {
798  return UnboxPrimitive(&throw_location, o, dst_class, nullptr, unboxed_value);
799}
800
801bool VerifyAccess(mirror::Object* obj, mirror::Class* declaring_class, uint32_t access_flags) {
802  NthCallerVisitor visitor(Thread::Current(), 2);
803  visitor.WalkStack();
804  mirror::Class* caller_class = visitor.caller->GetDeclaringClass();
805
806  if (((access_flags & kAccPublic) != 0) || (caller_class == declaring_class)) {
807    return true;
808  }
809  if ((access_flags & kAccPrivate) != 0) {
810    return false;
811  }
812  if ((access_flags & kAccProtected) != 0) {
813    if (obj != nullptr && !obj->InstanceOf(caller_class) &&
814        !declaring_class->IsInSamePackage(caller_class)) {
815      return false;
816    } else if (declaring_class->IsAssignableFrom(caller_class)) {
817      return true;
818    }
819  }
820  if (!declaring_class->IsInSamePackage(caller_class)) {
821    return false;
822  }
823  return true;
824}
825
826}  // namespace art
827