1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "common_throws.h"
18
19 #include <sstream>
20
21 #include <android-base/logging.h>
22 #include <android-base/stringprintf.h>
23
24 #include "art_field-inl.h"
25 #include "art_method-inl.h"
26 #include "class_linker-inl.h"
27 #include "debug_print.h"
28 #include "dex/dex_file-inl.h"
29 #include "dex/dex_instruction-inl.h"
30 #include "dex/invoke_type.h"
31 #include "mirror/class-inl.h"
32 #include "mirror/method_type.h"
33 #include "mirror/object-inl.h"
34 #include "mirror/object_array-inl.h"
35 #include "nativehelper/scoped_local_ref.h"
36 #include "obj_ptr-inl.h"
37 #include "thread.h"
38 #include "well_known_classes.h"
39
40 namespace art {
41
42 using android::base::StringAppendV;
43 using android::base::StringPrintf;
44
AddReferrerLocation(std::ostream & os,ObjPtr<mirror::Class> referrer)45 static void AddReferrerLocation(std::ostream& os, ObjPtr<mirror::Class> referrer)
46 REQUIRES_SHARED(Locks::mutator_lock_) {
47 if (referrer != nullptr) {
48 std::string location(referrer->GetLocation());
49 if (!location.empty()) {
50 os << " (declaration of '" << referrer->PrettyDescriptor()
51 << "' appears in " << location << ")";
52 }
53 }
54 }
55
ThrowException(const char * exception_descriptor)56 static void ThrowException(const char* exception_descriptor) REQUIRES_SHARED(Locks::mutator_lock_) {
57 Thread* self = Thread::Current();
58 self->ThrowNewException(exception_descriptor, nullptr);
59 }
60
ThrowException(const char * exception_descriptor,ObjPtr<mirror::Class> referrer,const char * fmt,va_list * args=nullptr)61 static void ThrowException(const char* exception_descriptor,
62 ObjPtr<mirror::Class> referrer,
63 const char* fmt,
64 va_list* args = nullptr)
65 REQUIRES_SHARED(Locks::mutator_lock_) {
66 std::ostringstream msg;
67 if (args != nullptr) {
68 std::string vmsg;
69 StringAppendV(&vmsg, fmt, *args);
70 msg << vmsg;
71 } else {
72 msg << fmt;
73 }
74 AddReferrerLocation(msg, referrer);
75 Thread* self = Thread::Current();
76 self->ThrowNewException(exception_descriptor, msg.str().c_str());
77 }
78
ThrowWrappedException(const char * exception_descriptor,ObjPtr<mirror::Class> referrer,const char * fmt,va_list * args=nullptr)79 static void ThrowWrappedException(const char* exception_descriptor,
80 ObjPtr<mirror::Class> referrer,
81 const char* fmt,
82 va_list* args = nullptr)
83 REQUIRES_SHARED(Locks::mutator_lock_) {
84 std::ostringstream msg;
85 if (args != nullptr) {
86 std::string vmsg;
87 StringAppendV(&vmsg, fmt, *args);
88 msg << vmsg;
89 } else {
90 msg << fmt;
91 }
92 AddReferrerLocation(msg, referrer);
93 Thread* self = Thread::Current();
94 self->ThrowNewWrappedException(exception_descriptor, msg.str().c_str());
95 }
96
97 // AbstractMethodError
98
ThrowAbstractMethodError(ArtMethod * method)99 void ThrowAbstractMethodError(ArtMethod* method) {
100 ThrowException("Ljava/lang/AbstractMethodError;", nullptr,
101 StringPrintf("abstract method \"%s\"",
102 ArtMethod::PrettyMethod(method).c_str()).c_str());
103 }
104
ThrowAbstractMethodError(uint32_t method_idx,const DexFile & dex_file)105 void ThrowAbstractMethodError(uint32_t method_idx, const DexFile& dex_file) {
106 ThrowException("Ljava/lang/AbstractMethodError;", /* referrer= */ nullptr,
107 StringPrintf("abstract method \"%s\"",
108 dex_file.PrettyMethod(method_idx,
109 /* with_signature= */ true).c_str()).c_str());
110 }
111
112 // ArithmeticException
113
ThrowArithmeticExceptionDivideByZero()114 void ThrowArithmeticExceptionDivideByZero() {
115 ThrowException("Ljava/lang/ArithmeticException;", nullptr, "divide by zero");
116 }
117
118 // ArrayIndexOutOfBoundsException
119
ThrowArrayIndexOutOfBoundsException(int index,int length)120 void ThrowArrayIndexOutOfBoundsException(int index, int length) {
121 ThrowException("Ljava/lang/ArrayIndexOutOfBoundsException;", nullptr,
122 StringPrintf("length=%d; index=%d", length, index).c_str());
123 }
124
125 // ArrayStoreException
126
ThrowArrayStoreException(ObjPtr<mirror::Class> element_class,ObjPtr<mirror::Class> array_class)127 void ThrowArrayStoreException(ObjPtr<mirror::Class> element_class,
128 ObjPtr<mirror::Class> array_class) {
129 ThrowException("Ljava/lang/ArrayStoreException;", nullptr,
130 StringPrintf("%s cannot be stored in an array of type %s",
131 mirror::Class::PrettyDescriptor(element_class).c_str(),
132 mirror::Class::PrettyDescriptor(array_class).c_str()).c_str());
133 }
134
135 // BootstrapMethodError
136
ThrowBootstrapMethodError(const char * fmt,...)137 void ThrowBootstrapMethodError(const char* fmt, ...) {
138 va_list args;
139 va_start(args, fmt);
140 ThrowException("Ljava/lang/BootstrapMethodError;", nullptr, fmt, &args);
141 va_end(args);
142 }
143
ThrowWrappedBootstrapMethodError(const char * fmt,...)144 void ThrowWrappedBootstrapMethodError(const char* fmt, ...) {
145 va_list args;
146 va_start(args, fmt);
147 ThrowWrappedException("Ljava/lang/BootstrapMethodError;", nullptr, fmt, &args);
148 va_end(args);
149 }
150
151 // ClassCastException
152
ThrowClassCastException(ObjPtr<mirror::Class> dest_type,ObjPtr<mirror::Class> src_type)153 void ThrowClassCastException(ObjPtr<mirror::Class> dest_type, ObjPtr<mirror::Class> src_type) {
154 DumpB77342775DebugData(dest_type, src_type);
155 ThrowException("Ljava/lang/ClassCastException;", nullptr,
156 StringPrintf("%s cannot be cast to %s",
157 mirror::Class::PrettyDescriptor(src_type).c_str(),
158 mirror::Class::PrettyDescriptor(dest_type).c_str()).c_str());
159 }
160
ThrowClassCastException(const char * msg)161 void ThrowClassCastException(const char* msg) {
162 ThrowException("Ljava/lang/ClassCastException;", nullptr, msg);
163 }
164
165 // ClassCircularityError
166
ThrowClassCircularityError(ObjPtr<mirror::Class> c)167 void ThrowClassCircularityError(ObjPtr<mirror::Class> c) {
168 std::ostringstream msg;
169 msg << mirror::Class::PrettyDescriptor(c);
170 ThrowException("Ljava/lang/ClassCircularityError;", c, msg.str().c_str());
171 }
172
ThrowClassCircularityError(ObjPtr<mirror::Class> c,const char * fmt,...)173 void ThrowClassCircularityError(ObjPtr<mirror::Class> c, const char* fmt, ...) {
174 va_list args;
175 va_start(args, fmt);
176 ThrowException("Ljava/lang/ClassCircularityError;", c, fmt, &args);
177 va_end(args);
178 }
179
180 // ClassFormatError
181
ThrowClassFormatError(ObjPtr<mirror::Class> referrer,const char * fmt,...)182 void ThrowClassFormatError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
183 va_list args;
184 va_start(args, fmt);
185 ThrowException("Ljava/lang/ClassFormatError;", referrer, fmt, &args);
186 va_end(args);
187 }
188
189 // IllegalAccessError
190
ThrowIllegalAccessErrorClass(ObjPtr<mirror::Class> referrer,ObjPtr<mirror::Class> accessed)191 void ThrowIllegalAccessErrorClass(ObjPtr<mirror::Class> referrer, ObjPtr<mirror::Class> accessed) {
192 std::ostringstream msg;
193 msg << "Illegal class access: '" << mirror::Class::PrettyDescriptor(referrer)
194 << "' attempting to access '" << mirror::Class::PrettyDescriptor(accessed) << "'";
195 ThrowException("Ljava/lang/IllegalAccessError;", referrer, msg.str().c_str());
196 }
197
ThrowIllegalAccessErrorClassForMethodDispatch(ObjPtr<mirror::Class> referrer,ObjPtr<mirror::Class> accessed,ArtMethod * called,InvokeType type)198 void ThrowIllegalAccessErrorClassForMethodDispatch(ObjPtr<mirror::Class> referrer,
199 ObjPtr<mirror::Class> accessed,
200 ArtMethod* called,
201 InvokeType type) {
202 std::ostringstream msg;
203 msg << "Illegal class access ('" << mirror::Class::PrettyDescriptor(referrer)
204 << "' attempting to access '"
205 << mirror::Class::PrettyDescriptor(accessed) << "') in attempt to invoke " << type
206 << " method " << ArtMethod::PrettyMethod(called).c_str();
207 ThrowException("Ljava/lang/IllegalAccessError;", referrer, msg.str().c_str());
208 }
209
ThrowIllegalAccessErrorMethod(ObjPtr<mirror::Class> referrer,ArtMethod * accessed)210 void ThrowIllegalAccessErrorMethod(ObjPtr<mirror::Class> referrer, ArtMethod* accessed) {
211 std::ostringstream msg;
212 msg << "Method '" << ArtMethod::PrettyMethod(accessed) << "' is inaccessible to class '"
213 << mirror::Class::PrettyDescriptor(referrer) << "'";
214 ThrowException("Ljava/lang/IllegalAccessError;", referrer, msg.str().c_str());
215 }
216
ThrowIllegalAccessErrorField(ObjPtr<mirror::Class> referrer,ArtField * accessed)217 void ThrowIllegalAccessErrorField(ObjPtr<mirror::Class> referrer, ArtField* accessed) {
218 std::ostringstream msg;
219 msg << "Field '" << ArtField::PrettyField(accessed, false) << "' is inaccessible to class '"
220 << mirror::Class::PrettyDescriptor(referrer) << "'";
221 ThrowException("Ljava/lang/IllegalAccessError;", referrer, msg.str().c_str());
222 }
223
ThrowIllegalAccessErrorFinalField(ArtMethod * referrer,ArtField * accessed)224 void ThrowIllegalAccessErrorFinalField(ArtMethod* referrer, ArtField* accessed) {
225 std::ostringstream msg;
226 msg << "Final field '" << ArtField::PrettyField(accessed, false)
227 << "' cannot be written to by method '" << ArtMethod::PrettyMethod(referrer) << "'";
228 ThrowException("Ljava/lang/IllegalAccessError;",
229 referrer != nullptr ? referrer->GetDeclaringClass() : nullptr,
230 msg.str().c_str());
231 }
232
ThrowIllegalAccessError(ObjPtr<mirror::Class> referrer,const char * fmt,...)233 void ThrowIllegalAccessError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
234 va_list args;
235 va_start(args, fmt);
236 ThrowException("Ljava/lang/IllegalAccessError;", referrer, fmt, &args);
237 va_end(args);
238 }
239
240 // IllegalAccessException
241
ThrowIllegalAccessException(const char * msg)242 void ThrowIllegalAccessException(const char* msg) {
243 ThrowException("Ljava/lang/IllegalAccessException;", nullptr, msg);
244 }
245
246 // IllegalArgumentException
247
ThrowIllegalArgumentException(const char * msg)248 void ThrowIllegalArgumentException(const char* msg) {
249 ThrowException("Ljava/lang/IllegalArgumentException;", nullptr, msg);
250 }
251
252 // IllegalStateException
253
ThrowIllegalStateException(const char * msg)254 void ThrowIllegalStateException(const char* msg) {
255 ThrowException("Ljava/lang/IllegalStateException;", nullptr, msg);
256 }
257
258 // IncompatibleClassChangeError
259
ThrowIncompatibleClassChangeError(InvokeType expected_type,InvokeType found_type,ArtMethod * method,ArtMethod * referrer)260 void ThrowIncompatibleClassChangeError(InvokeType expected_type, InvokeType found_type,
261 ArtMethod* method, ArtMethod* referrer) {
262 std::ostringstream msg;
263 msg << "The method '" << ArtMethod::PrettyMethod(method) << "' was expected to be of type "
264 << expected_type << " but instead was found to be of type " << found_type;
265 ThrowException("Ljava/lang/IncompatibleClassChangeError;",
266 referrer != nullptr ? referrer->GetDeclaringClass() : nullptr,
267 msg.str().c_str());
268 }
269
ThrowIncompatibleClassChangeErrorClassForInterfaceSuper(ArtMethod * method,ObjPtr<mirror::Class> target_class,ObjPtr<mirror::Object> this_object,ArtMethod * referrer)270 void ThrowIncompatibleClassChangeErrorClassForInterfaceSuper(ArtMethod* method,
271 ObjPtr<mirror::Class> target_class,
272 ObjPtr<mirror::Object> this_object,
273 ArtMethod* referrer) {
274 // Referrer is calling interface_method on this_object, however, the interface_method isn't
275 // implemented by this_object.
276 CHECK(this_object != nullptr);
277 std::ostringstream msg;
278 msg << "Class '" << mirror::Class::PrettyDescriptor(this_object->GetClass())
279 << "' does not implement interface '" << mirror::Class::PrettyDescriptor(target_class)
280 << "' in call to '"
281 << ArtMethod::PrettyMethod(method) << "'";
282 DumpB77342775DebugData(target_class, this_object->GetClass());
283 ThrowException("Ljava/lang/IncompatibleClassChangeError;",
284 referrer != nullptr ? referrer->GetDeclaringClass() : nullptr,
285 msg.str().c_str());
286 }
287
ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(ArtMethod * interface_method,ObjPtr<mirror::Object> this_object,ArtMethod * referrer)288 void ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(ArtMethod* interface_method,
289 ObjPtr<mirror::Object> this_object,
290 ArtMethod* referrer) {
291 // Referrer is calling interface_method on this_object, however, the interface_method isn't
292 // implemented by this_object.
293 CHECK(this_object != nullptr);
294 std::ostringstream msg;
295 msg << "Class '" << mirror::Class::PrettyDescriptor(this_object->GetClass())
296 << "' does not implement interface '"
297 << mirror::Class::PrettyDescriptor(interface_method->GetDeclaringClass())
298 << "' in call to '" << ArtMethod::PrettyMethod(interface_method) << "'";
299 DumpB77342775DebugData(interface_method->GetDeclaringClass(), this_object->GetClass());
300 ThrowException("Ljava/lang/IncompatibleClassChangeError;",
301 referrer != nullptr ? referrer->GetDeclaringClass() : nullptr,
302 msg.str().c_str());
303 }
304
ThrowIncompatibleClassChangeErrorField(ArtField * resolved_field,bool is_static,ArtMethod * referrer)305 void ThrowIncompatibleClassChangeErrorField(ArtField* resolved_field, bool is_static,
306 ArtMethod* referrer) {
307 std::ostringstream msg;
308 msg << "Expected '" << ArtField::PrettyField(resolved_field) << "' to be a "
309 << (is_static ? "static" : "instance") << " field" << " rather than a "
310 << (is_static ? "instance" : "static") << " field";
311 ThrowException("Ljava/lang/IncompatibleClassChangeError;", referrer->GetDeclaringClass(),
312 msg.str().c_str());
313 }
314
ThrowIncompatibleClassChangeError(ObjPtr<mirror::Class> referrer,const char * fmt,...)315 void ThrowIncompatibleClassChangeError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
316 va_list args;
317 va_start(args, fmt);
318 ThrowException("Ljava/lang/IncompatibleClassChangeError;", referrer, fmt, &args);
319 va_end(args);
320 }
321
ThrowIncompatibleClassChangeErrorForMethodConflict(ArtMethod * method)322 void ThrowIncompatibleClassChangeErrorForMethodConflict(ArtMethod* method) {
323 DCHECK(method != nullptr);
324 ThrowException("Ljava/lang/IncompatibleClassChangeError;",
325 /*referrer=*/nullptr,
326 StringPrintf("Conflicting default method implementations %s",
327 ArtMethod::PrettyMethod(method).c_str()).c_str());
328 }
329
330 // IndexOutOfBoundsException
331
ThrowIndexOutOfBoundsException(int index,int length)332 void ThrowIndexOutOfBoundsException(int index, int length) {
333 ThrowException("Ljava/lang/IndexOutOfBoundsException;", nullptr,
334 StringPrintf("length=%d; index=%d", length, index).c_str());
335 }
336
337 // InternalError
338
ThrowInternalError(const char * fmt,...)339 void ThrowInternalError(const char* fmt, ...) {
340 va_list args;
341 va_start(args, fmt);
342 ThrowException("Ljava/lang/InternalError;", nullptr, fmt, &args);
343 va_end(args);
344 }
345
346 // IOException
347
ThrowIOException(const char * fmt,...)348 void ThrowIOException(const char* fmt, ...) {
349 va_list args;
350 va_start(args, fmt);
351 ThrowException("Ljava/io/IOException;", nullptr, fmt, &args);
352 va_end(args);
353 }
354
ThrowWrappedIOException(const char * fmt,...)355 void ThrowWrappedIOException(const char* fmt, ...) {
356 va_list args;
357 va_start(args, fmt);
358 ThrowWrappedException("Ljava/io/IOException;", nullptr, fmt, &args);
359 va_end(args);
360 }
361
362 // LinkageError
363
ThrowLinkageError(ObjPtr<mirror::Class> referrer,const char * fmt,...)364 void ThrowLinkageError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
365 va_list args;
366 va_start(args, fmt);
367 ThrowException("Ljava/lang/LinkageError;", referrer, fmt, &args);
368 va_end(args);
369 }
370
ThrowWrappedLinkageError(ObjPtr<mirror::Class> referrer,const char * fmt,...)371 void ThrowWrappedLinkageError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
372 va_list args;
373 va_start(args, fmt);
374 ThrowWrappedException("Ljava/lang/LinkageError;", referrer, fmt, &args);
375 va_end(args);
376 }
377
378 // NegativeArraySizeException
379
ThrowNegativeArraySizeException(int size)380 void ThrowNegativeArraySizeException(int size) {
381 ThrowException("Ljava/lang/NegativeArraySizeException;", nullptr,
382 StringPrintf("%d", size).c_str());
383 }
384
ThrowNegativeArraySizeException(const char * msg)385 void ThrowNegativeArraySizeException(const char* msg) {
386 ThrowException("Ljava/lang/NegativeArraySizeException;", nullptr, msg);
387 }
388
389 // NoSuchFieldError
390
ThrowNoSuchFieldError(std::string_view scope,ObjPtr<mirror::Class> c,std::string_view type,std::string_view name)391 void ThrowNoSuchFieldError(std::string_view scope,
392 ObjPtr<mirror::Class> c,
393 std::string_view type,
394 std::string_view name) {
395 std::ostringstream msg;
396 std::string temp;
397 msg << "No " << scope << "field " << name << " of type " << type
398 << " in class " << c->GetDescriptor(&temp) << " or its superclasses";
399 ThrowException("Ljava/lang/NoSuchFieldError;", c, msg.str().c_str());
400 }
401
ThrowNoSuchFieldException(ObjPtr<mirror::Class> c,std::string_view name)402 void ThrowNoSuchFieldException(ObjPtr<mirror::Class> c, std::string_view name) {
403 std::ostringstream msg;
404 std::string temp;
405 msg << "No field " << name << " in class " << c->GetDescriptor(&temp);
406 ThrowException("Ljava/lang/NoSuchFieldException;", c, msg.str().c_str());
407 }
408
409 // NoSuchMethodError
410
ThrowNoSuchMethodError(InvokeType type,ObjPtr<mirror::Class> c,std::string_view name,const Signature & signature)411 void ThrowNoSuchMethodError(InvokeType type,
412 ObjPtr<mirror::Class> c,
413 std::string_view name,
414 const Signature& signature) {
415 std::ostringstream msg;
416 std::string temp;
417 msg << "No " << type << " method " << name << signature
418 << " in class " << c->GetDescriptor(&temp) << " or its super classes";
419 ThrowException("Ljava/lang/NoSuchMethodError;", c, msg.str().c_str());
420 }
421
422 // NullPointerException
423
ThrowNullPointerExceptionForFieldAccess(ArtField * field,bool is_read)424 void ThrowNullPointerExceptionForFieldAccess(ArtField* field, bool is_read) {
425 std::ostringstream msg;
426 msg << "Attempt to " << (is_read ? "read from" : "write to")
427 << " field '" << ArtField::PrettyField(field, true) << "' on a null object reference";
428 ThrowException("Ljava/lang/NullPointerException;", nullptr, msg.str().c_str());
429 }
430
ThrowNullPointerExceptionForMethodAccessImpl(uint32_t method_idx,const DexFile & dex_file,InvokeType type)431 static void ThrowNullPointerExceptionForMethodAccessImpl(uint32_t method_idx,
432 const DexFile& dex_file,
433 InvokeType type)
434 REQUIRES_SHARED(Locks::mutator_lock_) {
435 std::ostringstream msg;
436 msg << "Attempt to invoke " << type << " method '"
437 << dex_file.PrettyMethod(method_idx, true) << "' on a null object reference";
438 ThrowException("Ljava/lang/NullPointerException;", nullptr, msg.str().c_str());
439 }
440
ThrowNullPointerExceptionForMethodAccess(uint32_t method_idx,InvokeType type)441 void ThrowNullPointerExceptionForMethodAccess(uint32_t method_idx, InvokeType type) {
442 const DexFile& dex_file = *Thread::Current()->GetCurrentMethod(nullptr)->GetDexFile();
443 ThrowNullPointerExceptionForMethodAccessImpl(method_idx, dex_file, type);
444 }
445
ThrowNullPointerExceptionForMethodAccess(ArtMethod * method,InvokeType type)446 void ThrowNullPointerExceptionForMethodAccess(ArtMethod* method, InvokeType type) {
447 ThrowNullPointerExceptionForMethodAccessImpl(method->GetDexMethodIndex(),
448 *method->GetDexFile(),
449 type);
450 }
451
IsValidReadBarrierImplicitCheck(uintptr_t addr)452 static bool IsValidReadBarrierImplicitCheck(uintptr_t addr) {
453 DCHECK(kEmitCompilerReadBarrier);
454 uint32_t monitor_offset = mirror::Object::MonitorOffset().Uint32Value();
455 if (kUseBakerReadBarrier &&
456 (kRuntimeISA == InstructionSet::kX86 || kRuntimeISA == InstructionSet::kX86_64)) {
457 constexpr uint32_t gray_byte_position = LockWord::kReadBarrierStateShift / kBitsPerByte;
458 monitor_offset += gray_byte_position;
459 }
460 return addr == monitor_offset;
461 }
462
IsValidImplicitCheck(uintptr_t addr,const Instruction & instr)463 static bool IsValidImplicitCheck(uintptr_t addr, const Instruction& instr)
464 REQUIRES_SHARED(Locks::mutator_lock_) {
465 if (!CanDoImplicitNullCheckOn(addr)) {
466 return false;
467 }
468
469 switch (instr.Opcode()) {
470 case Instruction::INVOKE_DIRECT:
471 case Instruction::INVOKE_DIRECT_RANGE:
472 case Instruction::INVOKE_VIRTUAL:
473 case Instruction::INVOKE_VIRTUAL_RANGE:
474 case Instruction::INVOKE_INTERFACE:
475 case Instruction::INVOKE_INTERFACE_RANGE:
476 case Instruction::INVOKE_POLYMORPHIC:
477 case Instruction::INVOKE_POLYMORPHIC_RANGE:
478 case Instruction::INVOKE_VIRTUAL_QUICK:
479 case Instruction::INVOKE_VIRTUAL_RANGE_QUICK: {
480 // Without inlining, we could just check that the offset is the class offset.
481 // However, when inlining, the compiler can (validly) merge the null check with a field access
482 // on the same object. Note that the stack map at the NPE will reflect the invoke's location,
483 // which is the caller.
484 return true;
485 }
486
487 case Instruction::IGET_OBJECT:
488 if (kEmitCompilerReadBarrier && IsValidReadBarrierImplicitCheck(addr)) {
489 return true;
490 }
491 FALLTHROUGH_INTENDED;
492 case Instruction::IGET:
493 case Instruction::IGET_WIDE:
494 case Instruction::IGET_BOOLEAN:
495 case Instruction::IGET_BYTE:
496 case Instruction::IGET_CHAR:
497 case Instruction::IGET_SHORT:
498 case Instruction::IPUT:
499 case Instruction::IPUT_WIDE:
500 case Instruction::IPUT_OBJECT:
501 case Instruction::IPUT_BOOLEAN:
502 case Instruction::IPUT_BYTE:
503 case Instruction::IPUT_CHAR:
504 case Instruction::IPUT_SHORT: {
505 // We might be doing an implicit null check with an offset that doesn't correspond
506 // to the instruction, for example with two field accesses and the first one being
507 // eliminated or re-ordered.
508 return true;
509 }
510
511 case Instruction::IGET_OBJECT_QUICK:
512 if (kEmitCompilerReadBarrier && IsValidReadBarrierImplicitCheck(addr)) {
513 return true;
514 }
515 FALLTHROUGH_INTENDED;
516 case Instruction::IGET_QUICK:
517 case Instruction::IGET_BOOLEAN_QUICK:
518 case Instruction::IGET_BYTE_QUICK:
519 case Instruction::IGET_CHAR_QUICK:
520 case Instruction::IGET_SHORT_QUICK:
521 case Instruction::IGET_WIDE_QUICK:
522 case Instruction::IPUT_QUICK:
523 case Instruction::IPUT_BOOLEAN_QUICK:
524 case Instruction::IPUT_BYTE_QUICK:
525 case Instruction::IPUT_CHAR_QUICK:
526 case Instruction::IPUT_SHORT_QUICK:
527 case Instruction::IPUT_WIDE_QUICK:
528 case Instruction::IPUT_OBJECT_QUICK: {
529 // We might be doing an implicit null check with an offset that doesn't correspond
530 // to the instruction, for example with two field accesses and the first one being
531 // eliminated or re-ordered.
532 return true;
533 }
534
535 case Instruction::AGET_OBJECT:
536 if (kEmitCompilerReadBarrier && IsValidReadBarrierImplicitCheck(addr)) {
537 return true;
538 }
539 FALLTHROUGH_INTENDED;
540 case Instruction::AGET:
541 case Instruction::AGET_WIDE:
542 case Instruction::AGET_BOOLEAN:
543 case Instruction::AGET_BYTE:
544 case Instruction::AGET_CHAR:
545 case Instruction::AGET_SHORT:
546 case Instruction::APUT:
547 case Instruction::APUT_WIDE:
548 case Instruction::APUT_OBJECT:
549 case Instruction::APUT_BOOLEAN:
550 case Instruction::APUT_BYTE:
551 case Instruction::APUT_CHAR:
552 case Instruction::APUT_SHORT:
553 case Instruction::FILL_ARRAY_DATA:
554 case Instruction::ARRAY_LENGTH: {
555 // The length access should crash. We currently do not do implicit checks on
556 // the array access itself.
557 return (addr == 0u) || (addr == mirror::Array::LengthOffset().Uint32Value());
558 }
559
560 default: {
561 // We have covered all the cases where an NPE could occur.
562 // Note that this must be kept in sync with the compiler, and adding
563 // any new way to do implicit checks in the compiler should also update
564 // this code.
565 return false;
566 }
567 }
568 }
569
ThrowNullPointerExceptionFromDexPC(bool check_address,uintptr_t addr)570 void ThrowNullPointerExceptionFromDexPC(bool check_address, uintptr_t addr) {
571 uint32_t throw_dex_pc;
572 ArtMethod* method = Thread::Current()->GetCurrentMethod(&throw_dex_pc);
573 CodeItemInstructionAccessor accessor(method->DexInstructions());
574 CHECK_LT(throw_dex_pc, accessor.InsnsSizeInCodeUnits());
575 const Instruction& instr = accessor.InstructionAt(throw_dex_pc);
576 if (check_address && !IsValidImplicitCheck(addr, instr)) {
577 const DexFile* dex_file = method->GetDexFile();
578 LOG(FATAL) << "Invalid address for an implicit NullPointerException check: "
579 << "0x" << std::hex << addr << std::dec
580 << ", at "
581 << instr.DumpString(dex_file)
582 << " in "
583 << method->PrettyMethod();
584 }
585
586 switch (instr.Opcode()) {
587 case Instruction::INVOKE_DIRECT:
588 ThrowNullPointerExceptionForMethodAccess(instr.VRegB_35c(), kDirect);
589 break;
590 case Instruction::INVOKE_DIRECT_RANGE:
591 ThrowNullPointerExceptionForMethodAccess(instr.VRegB_3rc(), kDirect);
592 break;
593 case Instruction::INVOKE_VIRTUAL:
594 ThrowNullPointerExceptionForMethodAccess(instr.VRegB_35c(), kVirtual);
595 break;
596 case Instruction::INVOKE_VIRTUAL_RANGE:
597 ThrowNullPointerExceptionForMethodAccess(instr.VRegB_3rc(), kVirtual);
598 break;
599 case Instruction::INVOKE_INTERFACE:
600 ThrowNullPointerExceptionForMethodAccess(instr.VRegB_35c(), kInterface);
601 break;
602 case Instruction::INVOKE_INTERFACE_RANGE:
603 ThrowNullPointerExceptionForMethodAccess(instr.VRegB_3rc(), kInterface);
604 break;
605 case Instruction::INVOKE_POLYMORPHIC:
606 ThrowNullPointerExceptionForMethodAccess(instr.VRegB_45cc(), kVirtual);
607 break;
608 case Instruction::INVOKE_POLYMORPHIC_RANGE:
609 ThrowNullPointerExceptionForMethodAccess(instr.VRegB_4rcc(), kVirtual);
610 break;
611 case Instruction::INVOKE_VIRTUAL_QUICK:
612 case Instruction::INVOKE_VIRTUAL_RANGE_QUICK: {
613 uint16_t method_idx = method->GetIndexFromQuickening(throw_dex_pc);
614 if (method_idx != DexFile::kDexNoIndex16) {
615 // NPE with precise message.
616 ThrowNullPointerExceptionForMethodAccess(method_idx, kVirtual);
617 } else {
618 // NPE with imprecise message.
619 ThrowNullPointerException("Attempt to invoke a virtual method on a null object reference");
620 }
621 break;
622 }
623 case Instruction::IGET:
624 case Instruction::IGET_WIDE:
625 case Instruction::IGET_OBJECT:
626 case Instruction::IGET_BOOLEAN:
627 case Instruction::IGET_BYTE:
628 case Instruction::IGET_CHAR:
629 case Instruction::IGET_SHORT: {
630 ArtField* field =
631 Runtime::Current()->GetClassLinker()->ResolveField(instr.VRegC_22c(), method, false);
632 Thread::Current()->ClearException(); // Resolution may fail, ignore.
633 ThrowNullPointerExceptionForFieldAccess(field, /* is_read= */ true);
634 break;
635 }
636 case Instruction::IGET_QUICK:
637 case Instruction::IGET_BOOLEAN_QUICK:
638 case Instruction::IGET_BYTE_QUICK:
639 case Instruction::IGET_CHAR_QUICK:
640 case Instruction::IGET_SHORT_QUICK:
641 case Instruction::IGET_WIDE_QUICK:
642 case Instruction::IGET_OBJECT_QUICK: {
643 uint16_t field_idx = method->GetIndexFromQuickening(throw_dex_pc);
644 ArtField* field = nullptr;
645 CHECK_NE(field_idx, DexFile::kDexNoIndex16);
646 field = Runtime::Current()->GetClassLinker()->ResolveField(
647 field_idx, method, /* is_static= */ false);
648 Thread::Current()->ClearException(); // Resolution may fail, ignore.
649 ThrowNullPointerExceptionForFieldAccess(field, /* is_read= */ true);
650 break;
651 }
652 case Instruction::IPUT:
653 case Instruction::IPUT_WIDE:
654 case Instruction::IPUT_OBJECT:
655 case Instruction::IPUT_BOOLEAN:
656 case Instruction::IPUT_BYTE:
657 case Instruction::IPUT_CHAR:
658 case Instruction::IPUT_SHORT: {
659 ArtField* field = Runtime::Current()->GetClassLinker()->ResolveField(
660 instr.VRegC_22c(), method, /* is_static= */ false);
661 Thread::Current()->ClearException(); // Resolution may fail, ignore.
662 ThrowNullPointerExceptionForFieldAccess(field, /* is_read= */ false);
663 break;
664 }
665 case Instruction::IPUT_QUICK:
666 case Instruction::IPUT_BOOLEAN_QUICK:
667 case Instruction::IPUT_BYTE_QUICK:
668 case Instruction::IPUT_CHAR_QUICK:
669 case Instruction::IPUT_SHORT_QUICK:
670 case Instruction::IPUT_WIDE_QUICK:
671 case Instruction::IPUT_OBJECT_QUICK: {
672 uint16_t field_idx = method->GetIndexFromQuickening(throw_dex_pc);
673 ArtField* field = nullptr;
674 CHECK_NE(field_idx, DexFile::kDexNoIndex16);
675 field = Runtime::Current()->GetClassLinker()->ResolveField(
676 field_idx, method, /* is_static= */ false);
677 Thread::Current()->ClearException(); // Resolution may fail, ignore.
678 ThrowNullPointerExceptionForFieldAccess(field, /* is_read= */ false);
679 break;
680 }
681 case Instruction::AGET:
682 case Instruction::AGET_WIDE:
683 case Instruction::AGET_OBJECT:
684 case Instruction::AGET_BOOLEAN:
685 case Instruction::AGET_BYTE:
686 case Instruction::AGET_CHAR:
687 case Instruction::AGET_SHORT:
688 ThrowException("Ljava/lang/NullPointerException;", nullptr,
689 "Attempt to read from null array");
690 break;
691 case Instruction::APUT:
692 case Instruction::APUT_WIDE:
693 case Instruction::APUT_OBJECT:
694 case Instruction::APUT_BOOLEAN:
695 case Instruction::APUT_BYTE:
696 case Instruction::APUT_CHAR:
697 case Instruction::APUT_SHORT:
698 ThrowException("Ljava/lang/NullPointerException;", nullptr,
699 "Attempt to write to null array");
700 break;
701 case Instruction::ARRAY_LENGTH:
702 ThrowException("Ljava/lang/NullPointerException;", nullptr,
703 "Attempt to get length of null array");
704 break;
705 case Instruction::FILL_ARRAY_DATA: {
706 ThrowException("Ljava/lang/NullPointerException;", nullptr,
707 "Attempt to write to null array");
708 break;
709 }
710 case Instruction::MONITOR_ENTER:
711 case Instruction::MONITOR_EXIT: {
712 ThrowException("Ljava/lang/NullPointerException;", nullptr,
713 "Attempt to do a synchronize operation on a null object");
714 break;
715 }
716 default: {
717 const DexFile* dex_file = method->GetDexFile();
718 LOG(FATAL) << "NullPointerException at an unexpected instruction: "
719 << instr.DumpString(dex_file)
720 << " in "
721 << method->PrettyMethod();
722 UNREACHABLE();
723 }
724 }
725 }
726
ThrowNullPointerException(const char * msg)727 void ThrowNullPointerException(const char* msg) {
728 ThrowException("Ljava/lang/NullPointerException;", nullptr, msg);
729 }
730
731 // ReadOnlyBufferException
732
ThrowReadOnlyBufferException()733 void ThrowReadOnlyBufferException() {
734 Thread::Current()->ThrowNewException("Ljava/nio/ReadOnlyBufferException;", nullptr);
735 }
736
737 // RuntimeException
738
ThrowRuntimeException(const char * fmt,...)739 void ThrowRuntimeException(const char* fmt, ...) {
740 va_list args;
741 va_start(args, fmt);
742 ThrowException("Ljava/lang/RuntimeException;", nullptr, fmt, &args);
743 va_end(args);
744 }
745
746 // SecurityException
747
ThrowSecurityException(const char * fmt,...)748 void ThrowSecurityException(const char* fmt, ...) {
749 va_list args;
750 va_start(args, fmt);
751 ThrowException("Ljava/lang/SecurityException;", nullptr, fmt, &args);
752 va_end(args);
753 }
754
755 // Stack overflow.
756
ThrowStackOverflowError(Thread * self)757 void ThrowStackOverflowError(Thread* self) {
758 if (self->IsHandlingStackOverflow()) {
759 LOG(ERROR) << "Recursive stack overflow.";
760 // We don't fail here because SetStackEndForStackOverflow will print better diagnostics.
761 }
762
763 self->SetStackEndForStackOverflow(); // Allow space on the stack for constructor to execute.
764 JNIEnvExt* env = self->GetJniEnv();
765 std::string msg("stack size ");
766 msg += PrettySize(self->GetStackSize());
767
768 // Avoid running Java code for exception initialization.
769 // TODO: Checks to make this a bit less brittle.
770 //
771 // Note: this lambda ensures that the destruction of the ScopedLocalRefs will run in the extended
772 // stack, which is important for modes with larger stack sizes (e.g., ASAN). Using a lambda
773 // instead of a block simplifies the control flow.
774 auto create_and_throw = [&]() REQUIRES_SHARED(Locks::mutator_lock_) {
775 // Allocate an uninitialized object.
776 ScopedLocalRef<jobject> exc(env,
777 env->AllocObject(WellKnownClasses::java_lang_StackOverflowError));
778 if (exc == nullptr) {
779 LOG(WARNING) << "Could not allocate StackOverflowError object.";
780 return;
781 }
782
783 // "Initialize".
784 // StackOverflowError -> VirtualMachineError -> Error -> Throwable -> Object.
785 // Only Throwable has "custom" fields:
786 // String detailMessage.
787 // Throwable cause (= this).
788 // List<Throwable> suppressedExceptions (= Collections.emptyList()).
789 // Object stackState;
790 // StackTraceElement[] stackTrace;
791 // Only Throwable has a non-empty constructor:
792 // this.stackTrace = EmptyArray.STACK_TRACE_ELEMENT;
793 // fillInStackTrace();
794
795 // detailMessage.
796 // TODO: Use String::FromModifiedUTF...?
797 ScopedLocalRef<jstring> s(env, env->NewStringUTF(msg.c_str()));
798 if (s == nullptr) {
799 LOG(WARNING) << "Could not throw new StackOverflowError because JNI NewStringUTF failed.";
800 return;
801 }
802
803 env->SetObjectField(exc.get(), WellKnownClasses::java_lang_Throwable_detailMessage, s.get());
804
805 // cause.
806 env->SetObjectField(exc.get(), WellKnownClasses::java_lang_Throwable_cause, exc.get());
807
808 // suppressedExceptions.
809 ScopedLocalRef<jobject> emptylist(env, env->GetStaticObjectField(
810 WellKnownClasses::java_util_Collections,
811 WellKnownClasses::java_util_Collections_EMPTY_LIST));
812 CHECK(emptylist != nullptr);
813 env->SetObjectField(exc.get(),
814 WellKnownClasses::java_lang_Throwable_suppressedExceptions,
815 emptylist.get());
816
817 // stackState is set as result of fillInStackTrace. fillInStackTrace calls
818 // nativeFillInStackTrace.
819 ScopedLocalRef<jobject> stack_state_val(env, nullptr);
820 {
821 ScopedObjectAccessUnchecked soa(env); // TODO: Is this necessary?
822 stack_state_val.reset(soa.Self()->CreateInternalStackTrace<false>(soa));
823 }
824 if (stack_state_val != nullptr) {
825 env->SetObjectField(exc.get(),
826 WellKnownClasses::java_lang_Throwable_stackState,
827 stack_state_val.get());
828
829 // stackTrace.
830 ScopedLocalRef<jobject> stack_trace_elem(env, env->GetStaticObjectField(
831 WellKnownClasses::libcore_util_EmptyArray,
832 WellKnownClasses::libcore_util_EmptyArray_STACK_TRACE_ELEMENT));
833 env->SetObjectField(exc.get(),
834 WellKnownClasses::java_lang_Throwable_stackTrace,
835 stack_trace_elem.get());
836 } else {
837 LOG(WARNING) << "Could not create stack trace.";
838 // Note: we'll create an exception without stack state, which is valid.
839 }
840
841 // Throw the exception.
842 self->SetException(self->DecodeJObject(exc.get())->AsThrowable());
843 };
844 create_and_throw();
845 CHECK(self->IsExceptionPending());
846
847 bool explicit_overflow_check = Runtime::Current()->ExplicitStackOverflowChecks();
848 self->ResetDefaultStackEnd(); // Return to default stack size.
849
850 // And restore protection if implicit checks are on.
851 if (!explicit_overflow_check) {
852 self->ProtectStack();
853 }
854 }
855
856 // StringIndexOutOfBoundsException
857
ThrowStringIndexOutOfBoundsException(int index,int length)858 void ThrowStringIndexOutOfBoundsException(int index, int length) {
859 ThrowException("Ljava/lang/StringIndexOutOfBoundsException;", nullptr,
860 StringPrintf("length=%d; index=%d", length, index).c_str());
861 }
862
863 // UnsupportedOperationException
864
ThrowUnsupportedOperationException()865 void ThrowUnsupportedOperationException() {
866 ThrowException("Ljava/lang/UnsupportedOperationException;");
867 }
868
869 // VerifyError
870
ThrowVerifyError(ObjPtr<mirror::Class> referrer,const char * fmt,...)871 void ThrowVerifyError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
872 va_list args;
873 va_start(args, fmt);
874 ThrowException("Ljava/lang/VerifyError;", referrer, fmt, &args);
875 va_end(args);
876 }
877
878 // WrongMethodTypeException
879
ThrowWrongMethodTypeException(ObjPtr<mirror::MethodType> expected_type,ObjPtr<mirror::MethodType> actual_type)880 void ThrowWrongMethodTypeException(ObjPtr<mirror::MethodType> expected_type,
881 ObjPtr<mirror::MethodType> actual_type) {
882 ThrowWrongMethodTypeException(expected_type->PrettyDescriptor(), actual_type->PrettyDescriptor());
883 }
884
ThrowWrongMethodTypeException(const std::string & expected_descriptor,const std::string & actual_descriptor)885 void ThrowWrongMethodTypeException(const std::string& expected_descriptor,
886 const std::string& actual_descriptor) {
887 std::ostringstream msg;
888 msg << "Expected " << expected_descriptor << " but was " << actual_descriptor;
889 ThrowException("Ljava/lang/invoke/WrongMethodTypeException;", nullptr, msg.str().c_str());
890 }
891
892 } // namespace art
893