dalvik_system_DexFile.cc revision 63582f211b7123d02f18dfa7075f6758ccb2b07c 
1/*
2 * Copyright (C) 2008 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 <algorithm>
18#include <set>
19#include <fcntl.h>
20#ifdef __linux__
21#include <sys/sendfile.h>
22#else
23#include <sys/socket.h>
24#endif
25#include <sys/stat.h>
26#include <unistd.h>
27
28#include "base/logging.h"
29#include "base/stl_util.h"
30#include "base/stringprintf.h"
31#include "class_linker.h"
32#include "common_throws.h"
33#include "dex_file-inl.h"
34#include "gc/space/image_space.h"
35#include "gc/space/space-inl.h"
36#include "image.h"
37#include "jni_internal.h"
38#include "mirror/class_loader.h"
39#include "mirror/object-inl.h"
40#include "mirror/string.h"
41#include "oat.h"
42#include "os.h"
43#include "profiler.h"
44#include "runtime.h"
45#include "scoped_thread_state_change.h"
46#include "ScopedFd.h"
47#include "ScopedLocalRef.h"
48#include "ScopedUtfChars.h"
49#include "utils.h"
50#include "well_known_classes.h"
51#include "zip_archive.h"
52
53namespace art {
54
55// A smart pointer that provides read-only access to a Java string's UTF chars.
56// Unlike libcore's NullableScopedUtfChars, this will *not* throw NullPointerException if
57// passed a null jstring. The correct idiom is:
58//
59//   NullableScopedUtfChars name(env, javaName);
60//   if (env->ExceptionCheck()) {
61//       return NULL;
62//   }
63//   // ... use name.c_str()
64//
65// TODO: rewrite to get rid of this, or change ScopedUtfChars to offer this option.
66class NullableScopedUtfChars {
67 public:
68  NullableScopedUtfChars(JNIEnv* env, jstring s) : mEnv(env), mString(s) {
69    mUtfChars = (s != NULL) ? env->GetStringUTFChars(s, NULL) : NULL;
70  }
71
72  ~NullableScopedUtfChars() {
73    if (mUtfChars) {
74      mEnv->ReleaseStringUTFChars(mString, mUtfChars);
75    }
76  }
77
78  const char* c_str() const {
79    return mUtfChars;
80  }
81
82  size_t size() const {
83    return strlen(mUtfChars);
84  }
85
86  // Element access.
87  const char& operator[](size_t n) const {
88    return mUtfChars[n];
89  }
90
91 private:
92  JNIEnv* mEnv;
93  jstring mString;
94  const char* mUtfChars;
95
96  // Disallow copy and assignment.
97  NullableScopedUtfChars(const NullableScopedUtfChars&);
98  void operator=(const NullableScopedUtfChars&);
99};
100
101static jlong DexFile_openDexFileNative(JNIEnv* env, jclass, jstring javaSourceName, jstring javaOutputName, jint) {
102  ScopedUtfChars sourceName(env, javaSourceName);
103  if (sourceName.c_str() == NULL) {
104    return 0;
105  }
106  NullableScopedUtfChars outputName(env, javaOutputName);
107  if (env->ExceptionCheck()) {
108    return 0;
109  }
110
111  ClassLinker* linker = Runtime::Current()->GetClassLinker();
112  std::unique_ptr<std::vector<const DexFile*>> dex_files(new std::vector<const DexFile*>());
113  std::vector<std::string> error_msgs;
114
115  bool success = linker->OpenDexFilesFromOat(sourceName.c_str(), outputName.c_str(), &error_msgs,
116                                             dex_files.get());
117
118  if (success || !dex_files->empty()) {
119    // In the case of non-success, we have not found or could not generate the oat file.
120    // But we may still have found a dex file that we can use.
121    return static_cast<jlong>(reinterpret_cast<uintptr_t>(dex_files.release()));
122  } else {
123    // The vector should be empty after a failed loading attempt.
124    DCHECK_EQ(0U, dex_files->size());
125
126    ScopedObjectAccess soa(env);
127    CHECK(!error_msgs.empty());
128    // The most important message is at the end. So set up nesting by going forward, which will
129    // wrap the existing exception as a cause for the following one.
130    auto it = error_msgs.begin();
131    auto itEnd = error_msgs.end();
132    for ( ; it != itEnd; ++it) {
133      ThrowWrappedIOException("%s", it->c_str());
134    }
135
136    return 0;
137  }
138}
139
140static std::vector<const DexFile*>* toDexFiles(jlong dex_file_address, JNIEnv* env) {
141  std::vector<const DexFile*>* dex_files = reinterpret_cast<std::vector<const DexFile*>*>(
142      static_cast<uintptr_t>(dex_file_address));
143  if (UNLIKELY(dex_files == nullptr)) {
144    ScopedObjectAccess soa(env);
145    ThrowNullPointerException(NULL, "dex_file == null");
146  }
147  return dex_files;
148}
149
150static void DexFile_closeDexFile(JNIEnv* env, jclass, jlong cookie) {
151  std::unique_ptr<std::vector<const DexFile*>> dex_files(toDexFiles(cookie, env));
152  if (dex_files.get() == nullptr) {
153    return;
154  }
155  ScopedObjectAccess soa(env);
156
157  size_t index = 0;
158  for (const DexFile* dex_file : *dex_files) {
159    if (Runtime::Current()->GetClassLinker()->IsDexFileRegistered(*dex_file)) {
160      (*dex_files)[index] = nullptr;
161    }
162    index++;
163  }
164
165  STLDeleteElements(dex_files.get());
166  // Unique_ptr will delete the vector itself.
167}
168
169static jclass DexFile_defineClassNative(JNIEnv* env, jclass, jstring javaName, jobject javaLoader,
170                                        jlong cookie) {
171  std::vector<const DexFile*>* dex_files = toDexFiles(cookie, env);
172  if (dex_files == NULL) {
173    VLOG(class_linker) << "Failed to find dex_file";
174    return NULL;
175  }
176  ScopedUtfChars class_name(env, javaName);
177  if (class_name.c_str() == NULL) {
178    VLOG(class_linker) << "Failed to find class_name";
179    return NULL;
180  }
181  const std::string descriptor(DotToDescriptor(class_name.c_str()));
182
183  for (const DexFile* dex_file : *dex_files) {
184    const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor.c_str());
185    if (dex_class_def != nullptr) {
186      ScopedObjectAccess soa(env);
187      ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
188      class_linker->RegisterDexFile(*dex_file);
189      StackHandleScope<1> hs(soa.Self());
190      Handle<mirror::ClassLoader> class_loader(
191          hs.NewHandle(soa.Decode<mirror::ClassLoader*>(javaLoader)));
192      mirror::Class* result = class_linker->DefineClass(descriptor.c_str(), class_loader, *dex_file,
193                                                        *dex_class_def);
194      if (result != nullptr) {
195        VLOG(class_linker) << "DexFile_defineClassNative returning " << result;
196        return soa.AddLocalReference<jclass>(result);
197      }
198    }
199  }
200  VLOG(class_linker) << "Failed to find dex_class_def";
201  return nullptr;
202}
203
204// Needed as a compare functor for sets of const char
205struct CharPointerComparator {
206  bool operator()(const char *str1, const char *str2) const {
207    return strcmp(str1, str2) < 0;
208  }
209};
210
211// Note: this can be an expensive call, as we sort out duplicates in MultiDex files.
212static jobjectArray DexFile_getClassNameList(JNIEnv* env, jclass, jlong cookie) {
213  jobjectArray result = nullptr;
214  std::vector<const DexFile*>* dex_files = toDexFiles(cookie, env);
215
216  if (dex_files != nullptr) {
217    // Push all class descriptors into a set. Use set instead of unordered_set as we want to
218    // retrieve all in the end.
219    std::set<const char*, CharPointerComparator> descriptors;
220    for (const DexFile* dex_file : *dex_files) {
221      for (size_t i = 0; i < dex_file->NumClassDefs(); ++i) {
222        const DexFile::ClassDef& class_def = dex_file->GetClassDef(i);
223        const char* descriptor = dex_file->GetClassDescriptor(class_def);
224        descriptors.insert(descriptor);
225      }
226    }
227
228    // Now create output array and copy the set into it.
229    result = env->NewObjectArray(descriptors.size(), WellKnownClasses::java_lang_String, nullptr);
230    if (result != nullptr) {
231      auto it = descriptors.begin();
232      auto it_end = descriptors.end();
233      jsize i = 0;
234      for (; it != it_end; it++, ++i) {
235        std::string descriptor(DescriptorToDot(*it));
236        ScopedLocalRef<jstring> jdescriptor(env, env->NewStringUTF(descriptor.c_str()));
237        if (jdescriptor.get() == nullptr) {
238          return nullptr;
239        }
240        env->SetObjectArrayElement(result, i, jdescriptor.get());
241      }
242    }
243  }
244  return result;
245}
246
247static void CopyProfileFile(const char* oldfile, const char* newfile) {
248  ScopedFd src(open(oldfile, O_RDONLY));
249  if (src.get() == -1) {
250    PLOG(ERROR) << "Failed to open profile file " << oldfile
251      << ". My uid:gid is " << getuid() << ":" << getgid();
252    return;
253  }
254
255  struct stat stat_src;
256  if (fstat(src.get(), &stat_src) == -1) {
257    PLOG(ERROR) << "Failed to get stats for profile file  " << oldfile
258      << ". My uid:gid is " << getuid() << ":" << getgid();
259    return;
260  }
261
262  // Create the copy with rw------- (only accessible by system)
263  ScopedFd dst(open(newfile, O_WRONLY|O_CREAT|O_TRUNC, 0600));
264  if (dst.get()  == -1) {
265    PLOG(ERROR) << "Failed to create/write prev profile file " << newfile
266      << ".  My uid:gid is " << getuid() << ":" << getgid();
267    return;
268  }
269
270#ifdef __linux__
271  if (sendfile(dst.get(), src.get(), nullptr, stat_src.st_size) == -1) {
272#else
273  off_t len;
274  if (sendfile(dst.get(), src.get(), 0, &len, nullptr, 0) == -1) {
275#endif
276    PLOG(ERROR) << "Failed to copy profile file " << oldfile << " to " << newfile
277      << ". My uid:gid is " << getuid() << ":" << getgid();
278  }
279}
280
281// Java: dalvik.system.DexFile.UP_TO_DATE
282static const jbyte kUpToDate = 0;
283// Java: dalvik.system.DexFile.DEXOPT_NEEDED
284static const jbyte kPatchoatNeeded = 1;
285// Java: dalvik.system.DexFile.PATCHOAT_NEEDED
286static const jbyte kDexoptNeeded = 2;
287
288template <const bool kVerboseLogging, const bool kReasonLogging>
289static jbyte IsDexOptNeededForFile(const std::string& oat_filename, const char* filename,
290                                   InstructionSet target_instruction_set) {
291  std::string error_msg;
292  std::unique_ptr<const OatFile> oat_file(OatFile::Open(oat_filename, oat_filename, nullptr,
293                                                        false, &error_msg));
294  if (oat_file.get() == nullptr) {
295    if (kReasonLogging) {
296      LOG(INFO) << "DexFile_isDexOptNeeded failed to open oat file '" << oat_filename
297          << "' for file location '" << filename << "': " << error_msg;
298    }
299    error_msg.clear();
300    return kDexoptNeeded;
301  }
302  bool should_relocate_if_possible = Runtime::Current()->ShouldRelocate();
303  uint32_t location_checksum = 0;
304  const art::OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(filename, nullptr,
305                                                                          kReasonLogging);
306  if (oat_dex_file != nullptr) {
307    // If its not possible to read the classes.dex assume up-to-date as we won't be able to
308    // compile it anyway.
309    if (!DexFile::GetChecksum(filename, &location_checksum, &error_msg)) {
310      if (kVerboseLogging) {
311        LOG(INFO) << "DexFile_isDexOptNeeded found precompiled stripped file: "
312            << filename << " for " << oat_filename << ": " << error_msg;
313      }
314      if (ClassLinker::VerifyOatChecksums(oat_file.get(), target_instruction_set, &error_msg)) {
315        if (kVerboseLogging) {
316          LOG(INFO) << "DexFile_isDexOptNeeded file " << oat_filename
317                    << " is up-to-date for " << filename;
318        }
319        return kUpToDate;
320      } else if (should_relocate_if_possible &&
321                  ClassLinker::VerifyOatImageChecksum(oat_file.get(), target_instruction_set)) {
322        if (kReasonLogging) {
323          LOG(INFO) << "DexFile_isDexOptNeeded file " << oat_filename
324                    << " needs to be relocated for " << filename;
325        }
326        return kPatchoatNeeded;
327      } else {
328        if (kReasonLogging) {
329          LOG(INFO) << "DexFile_isDexOptNeeded file " << oat_filename
330                    << " is out of date for " << filename;
331        }
332        return kDexoptNeeded;
333      }
334      // If we get here the file is out of date and we should use the system one to relocate.
335    } else {
336      if (ClassLinker::VerifyOatAndDexFileChecksums(oat_file.get(), filename, location_checksum,
337                                                    target_instruction_set, &error_msg)) {
338        if (kVerboseLogging) {
339          LOG(INFO) << "DexFile_isDexOptNeeded file " << oat_filename
340                    << " is up-to-date for " << filename;
341        }
342        return kUpToDate;
343      } else if (location_checksum == oat_dex_file->GetDexFileLocationChecksum()
344                  && should_relocate_if_possible
345                  && ClassLinker::VerifyOatImageChecksum(oat_file.get(), target_instruction_set)) {
346        if (kReasonLogging) {
347          LOG(INFO) << "DexFile_isDexOptNeeded file " << oat_filename
348                    << " needs to be relocated for " << filename;
349        }
350        return kPatchoatNeeded;
351      } else {
352        if (kReasonLogging) {
353          LOG(INFO) << "DexFile_isDexOptNeeded file " << oat_filename
354                    << " is out of date for " << filename;
355        }
356        return kDexoptNeeded;
357      }
358    }
359  } else {
360    if (kReasonLogging) {
361      LOG(INFO) << "DexFile_isDexOptNeeded file " << oat_filename
362                << " does not contain " << filename;
363    }
364    return kDexoptNeeded;
365  }
366}
367
368static jbyte IsDexOptNeededInternal(JNIEnv* env, const char* filename,
369    const char* pkgname, const char* instruction_set, const jboolean defer) {
370  // Spammy logging for kUpToDate
371  const bool kVerboseLogging = false;
372  // Logging of reason for returning kDexoptNeeded or kPatchoatNeeded.
373  const bool kReasonLogging = true;
374
375  if ((filename == nullptr) || !OS::FileExists(filename)) {
376    LOG(ERROR) << "DexFile_isDexOptNeeded file '" << filename << "' does not exist";
377    ScopedLocalRef<jclass> fnfe(env, env->FindClass("java/io/FileNotFoundException"));
378    const char* message = (filename == nullptr) ? "<empty file name>" : filename;
379    env->ThrowNew(fnfe.get(), message);
380    return kUpToDate;
381  }
382
383  // Always treat elements of the bootclasspath as up-to-date.  The
384  // fact that code is running at all means that this should be true.
385  Runtime* runtime = Runtime::Current();
386  ClassLinker* class_linker = runtime->GetClassLinker();
387  // TODO: We're assuming that the 64 and 32 bit runtimes have identical
388  // class paths. isDexOptNeeded will not necessarily be called on a runtime
389  // that has the same instruction set as the file being dexopted.
390  const std::vector<const DexFile*>& boot_class_path = class_linker->GetBootClassPath();
391  for (size_t i = 0; i < boot_class_path.size(); i++) {
392    if (boot_class_path[i]->GetLocation() == filename) {
393      if (kVerboseLogging) {
394        LOG(INFO) << "DexFile_isDexOptNeeded ignoring boot class path file: " << filename;
395      }
396      return kUpToDate;
397    }
398  }
399
400  bool force_system_only = false;
401  bool require_system_version = false;
402
403  // Check the profile file.  We need to rerun dex2oat if the profile has changed significantly
404  // since the last time, or it's new.
405  // If the 'defer' argument is true then this will be retried later.  In this case we
406  // need to make sure that the profile file copy is not made so that we will get the
407  // same result second time.
408  std::string profile_file;
409  std::string prev_profile_file;
410  bool should_copy_profile = false;
411  if (Runtime::Current()->GetProfilerOptions().IsEnabled() && (pkgname != nullptr)) {
412    profile_file = GetDalvikCacheOrDie("profiles", false /* create_if_absent */)
413        + std::string("/") + pkgname;
414    prev_profile_file = profile_file + std::string("@old");
415
416    struct stat profstat, prevstat;
417    int e1 = stat(profile_file.c_str(), &profstat);
418    int e1_errno = errno;
419    int e2 = stat(prev_profile_file.c_str(), &prevstat);
420    int e2_errno = errno;
421    if (e1 < 0) {
422      if (e1_errno != EACCES) {
423        // No profile file, need to run dex2oat, unless we find a file in system
424        if (kReasonLogging) {
425          LOG(INFO) << "DexFile_isDexOptNeededInternal profile file " << profile_file << " doesn't exist. "
426                    << "Will check odex to see if we can find a working version.";
427        }
428        // Force it to only accept system files/files with versions in system.
429        require_system_version = true;
430      } else {
431        LOG(INFO) << "DexFile_isDexOptNeededInternal recieved EACCES trying to stat profile file "
432                  << profile_file;
433      }
434    } else if (e2 == 0) {
435      // There is a previous profile file.  Check if the profile has changed significantly.
436      // A change in profile is considered significant if X% (change_thr property) of the top K%
437      // (compile_thr property) samples has changed.
438      double top_k_threshold = Runtime::Current()->GetProfilerOptions().GetTopKThreshold();
439      double change_threshold = Runtime::Current()->GetProfilerOptions().GetTopKChangeThreshold();
440      double change_percent = 0.0;
441      ProfileFile new_profile, old_profile;
442      bool new_ok = new_profile.LoadFile(profile_file);
443      bool old_ok = old_profile.LoadFile(prev_profile_file);
444      if (!new_ok || !old_ok) {
445        if (kVerboseLogging) {
446          LOG(INFO) << "DexFile_isDexOptNeededInternal Ignoring invalid profiles: "
447                    << (new_ok ?  "" : profile_file) << " " << (old_ok ? "" : prev_profile_file);
448        }
449      } else {
450        std::set<std::string> new_top_k, old_top_k;
451        new_profile.GetTopKSamples(new_top_k, top_k_threshold);
452        old_profile.GetTopKSamples(old_top_k, top_k_threshold);
453        if (new_top_k.empty()) {
454          if (kVerboseLogging) {
455            LOG(INFO) << "DexFile_isDexOptNeededInternal empty profile: " << profile_file;
456          }
457          // If the new topK is empty we shouldn't optimize so we leave the change_percent at 0.0.
458        } else {
459          std::set<std::string> diff;
460          std::set_difference(new_top_k.begin(), new_top_k.end(), old_top_k.begin(), old_top_k.end(),
461            std::inserter(diff, diff.end()));
462          // TODO: consider using the usedPercentage instead of the plain diff count.
463          change_percent = 100.0 * static_cast<double>(diff.size()) / static_cast<double>(new_top_k.size());
464          if (kVerboseLogging) {
465            std::set<std::string>::iterator end = diff.end();
466            for (std::set<std::string>::iterator it = diff.begin(); it != end; it++) {
467              LOG(INFO) << "DexFile_isDexOptNeededInternal new in topK: " << *it;
468            }
469          }
470        }
471      }
472
473      if (change_percent > change_threshold) {
474        if (kReasonLogging) {
475          LOG(INFO) << "DexFile_isDexOptNeededInternal size of new profile file " << profile_file <<
476          " is significantly different from old profile file " << prev_profile_file << " (top "
477          << top_k_threshold << "% samples changed in proportion of " << change_percent << "%)";
478        }
479        should_copy_profile = !defer;
480        // Force us to only accept system files.
481        force_system_only = true;
482      }
483    } else if (e2_errno == ENOENT) {
484      // Previous profile does not exist.  Make a copy of the current one.
485      if (kVerboseLogging) {
486        LOG(INFO) << "DexFile_isDexOptNeededInternal previous profile doesn't exist: " << prev_profile_file;
487      }
488      should_copy_profile = !defer;
489    } else {
490      PLOG(INFO) << "Unable to stat previous profile file " << prev_profile_file;
491    }
492  }
493
494  const InstructionSet target_instruction_set = GetInstructionSetFromString(instruction_set);
495  if (target_instruction_set == kNone) {
496    ScopedLocalRef<jclass> iae(env, env->FindClass("java/lang/IllegalArgumentException"));
497    std::string message(StringPrintf("Instruction set %s is invalid.", instruction_set));
498    env->ThrowNew(iae.get(), message.c_str());
499    return 0;
500  }
501
502  // Get the filename for odex file next to the dex file.
503  std::string odex_filename(DexFilenameToOdexFilename(filename, target_instruction_set));
504  // Get the filename for the dalvik-cache file
505  std::string cache_dir;
506  bool have_android_data = false;
507  bool dalvik_cache_exists = false;
508  bool is_global_cache = false;
509  GetDalvikCache(instruction_set, false, &cache_dir, &have_android_data, &dalvik_cache_exists,
510                 &is_global_cache);
511  std::string cache_filename;  // was cache_location
512  bool have_cache_filename = false;
513  if (dalvik_cache_exists) {
514    std::string error_msg;
515    have_cache_filename = GetDalvikCacheFilename(filename, cache_dir.c_str(), &cache_filename,
516                                                 &error_msg);
517    if (!have_cache_filename && kVerboseLogging) {
518      LOG(INFO) << "DexFile_isDexOptNeededInternal failed to find cache file for dex file " << filename
519                << ": " << error_msg;
520    }
521  }
522
523  bool should_relocate_if_possible = Runtime::Current()->ShouldRelocate();
524
525  jbyte dalvik_cache_decision = -1;
526  // Lets try the cache first (since we want to load from there since thats where the relocated
527  // versions will be).
528  if (have_cache_filename && !force_system_only) {
529    // We can use the dalvik-cache if we find a good file.
530    dalvik_cache_decision =
531        IsDexOptNeededForFile<kVerboseLogging, kReasonLogging>(cache_filename, filename,
532                                                               target_instruction_set);
533    // We will only return DexOptNeeded if both the cache and system return it.
534    if (dalvik_cache_decision != kDexoptNeeded && !require_system_version) {
535      CHECK(!(dalvik_cache_decision == kPatchoatNeeded && !should_relocate_if_possible))
536          << "May not return PatchoatNeeded when patching is disabled.";
537      return dalvik_cache_decision;
538    }
539    // We couldn't find one thats easy. We should now try the system.
540  }
541
542  jbyte system_decision =
543      IsDexOptNeededForFile<kVerboseLogging, kReasonLogging>(odex_filename, filename,
544                                                             target_instruction_set);
545  CHECK(!(system_decision == kPatchoatNeeded && !should_relocate_if_possible))
546      << "May not return PatchoatNeeded when patching is disabled.";
547
548  if (require_system_version && system_decision == kPatchoatNeeded
549                             && dalvik_cache_decision == kUpToDate) {
550    // We have a version from system relocated to the cache. Return it.
551    return dalvik_cache_decision;
552  }
553
554  if (should_copy_profile && system_decision == kDexoptNeeded) {
555    CopyProfileFile(profile_file.c_str(), prev_profile_file.c_str());
556  }
557
558  return system_decision;
559}
560
561static jbyte DexFile_isDexOptNeededInternal(JNIEnv* env, jclass, jstring javaFilename,
562    jstring javaPkgname, jstring javaInstructionSet, jboolean defer) {
563  ScopedUtfChars filename(env, javaFilename);
564  if (env->ExceptionCheck()) {
565    return 0;
566  }
567
568  NullableScopedUtfChars pkgname(env, javaPkgname);
569
570  ScopedUtfChars instruction_set(env, javaInstructionSet);
571  if (env->ExceptionCheck()) {
572    return 0;
573  }
574
575  return IsDexOptNeededInternal(env, filename.c_str(), pkgname.c_str(),
576                                instruction_set.c_str(), defer);
577}
578
579// public API, NULL pkgname
580static jboolean DexFile_isDexOptNeeded(JNIEnv* env, jclass, jstring javaFilename) {
581  const char* instruction_set = GetInstructionSetString(kRuntimeISA);
582  ScopedUtfChars filename(env, javaFilename);
583  return kUpToDate != IsDexOptNeededInternal(env, filename.c_str(), nullptr /* pkgname */,
584                                             instruction_set, false /* defer */);
585}
586
587
588static JNINativeMethod gMethods[] = {
589  NATIVE_METHOD(DexFile, closeDexFile, "(J)V"),
590  NATIVE_METHOD(DexFile, defineClassNative, "(Ljava/lang/String;Ljava/lang/ClassLoader;J)Ljava/lang/Class;"),
591  NATIVE_METHOD(DexFile, getClassNameList, "(J)[Ljava/lang/String;"),
592  NATIVE_METHOD(DexFile, isDexOptNeeded, "(Ljava/lang/String;)Z"),
593  NATIVE_METHOD(DexFile, isDexOptNeededInternal, "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Z)B"),
594  NATIVE_METHOD(DexFile, openDexFileNative, "(Ljava/lang/String;Ljava/lang/String;I)J"),
595};
596
597void register_dalvik_system_DexFile(JNIEnv* env) {
598  REGISTER_NATIVE_METHODS("dalvik/system/DexFile");
599}
600
601}  // namespace art
602