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      1 /* Copyright (C) 2014 The Android Open Source Project
      2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
      3  *
      4  * This file implements interfaces from the file jvm.h. This implementation
      5  * is licensed under the same terms as the file jvm.h.  The
      6  * copyright and license information for the file jvm.h follows.
      7  *
      8  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
      9  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     10  *
     11  * This code is free software; you can redistribute it and/or modify it
     12  * under the terms of the GNU General Public License version 2 only, as
     13  * published by the Free Software Foundation.  Oracle designates this
     14  * particular file as subject to the "Classpath" exception as provided
     15  * by Oracle in the LICENSE file that accompanied this code.
     16  *
     17  * This code is distributed in the hope that it will be useful, but WITHOUT
     18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     20  * version 2 for more details (a copy is included in the LICENSE file that
     21  * accompanied this code).
     22  *
     23  * You should have received a copy of the GNU General Public License version
     24  * 2 along with this work; if not, write to the Free Software Foundation,
     25  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
     26  *
     27  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
     28  * or visit www.oracle.com if you need additional information or have any
     29  * questions.
     30  */
     31 
     32 /*
     33  * Services that OpenJDK expects the VM to provide.
     34  */
     35 #include<stdio.h>
     36 #include <dlfcn.h>
     37 #include <limits.h>
     38 #include <sys/time.h>
     39 #include <sys/socket.h>
     40 #include <sys/ioctl.h>
     41 #include <unistd.h>
     42 
     43 #include "../../libcore/ojluni/src/main/native/jvm.h"  // TODO(narayan): fix it
     44 
     45 #include "base/logging.h"
     46 #include "base/macros.h"
     47 #include "common_throws.h"
     48 #include "gc/heap.h"
     49 #include "handle_scope-inl.h"
     50 #include "java_vm_ext.h"
     51 #include "jni_internal.h"
     52 #include "mirror/class_loader.h"
     53 #include "mirror/string-inl.h"
     54 #include "monitor.h"
     55 #include "native/scoped_fast_native_object_access-inl.h"
     56 #include "runtime.h"
     57 #include "thread.h"
     58 #include "thread_list.h"
     59 #include "scoped_thread_state_change-inl.h"
     60 #include "ScopedLocalRef.h"
     61 #include "ScopedUtfChars.h"
     62 #include "verify_object.h"
     63 
     64 #undef LOG_TAG
     65 #define LOG_TAG "artopenjdk"
     66 
     67 using ::android::base::WARNING;
     68 using ::android::base::INFO;
     69 using ::android::base::ERROR;
     70 using ::android::base::FATAL;
     71 
     72 /* posix open() with extensions; used by e.g. ZipFile */
     73 JNIEXPORT jint JVM_Open(const char* fname, jint flags, jint mode) {
     74     /*
     75      * Some code seems to want the special return value JVM_EEXIST if the
     76      * file open fails due to O_EXCL.
     77      */
     78     // Don't use JVM_O_DELETE, it's problematic with FUSE, see b/28901232.
     79     if (flags & JVM_O_DELETE) {
     80         LOG(FATAL) << "JVM_O_DELETE option is not supported (while opening: '"
     81                    << fname << "')";
     82     }
     83 
     84     int fd = TEMP_FAILURE_RETRY(open(fname, flags & ~JVM_O_DELETE, mode));
     85     if (fd < 0) {
     86         int err = errno;
     87         if (err == EEXIST) {
     88             return JVM_EEXIST;
     89         } else {
     90             return -1;
     91         }
     92     }
     93 
     94     return fd;
     95 }
     96 
     97 /* posix close() */
     98 JNIEXPORT jint JVM_Close(jint fd) {
     99     // don't want TEMP_FAILURE_RETRY here -- file is closed even if EINTR
    100     return close(fd);
    101 }
    102 
    103 /* posix read() */
    104 JNIEXPORT jint JVM_Read(jint fd, char* buf, jint nbytes) {
    105     return TEMP_FAILURE_RETRY(read(fd, buf, nbytes));
    106 }
    107 
    108 /* posix write(); is used to write messages to stderr */
    109 JNIEXPORT jint JVM_Write(jint fd, char* buf, jint nbytes) {
    110     return TEMP_FAILURE_RETRY(write(fd, buf, nbytes));
    111 }
    112 
    113 /* posix lseek() */
    114 JNIEXPORT jlong JVM_Lseek(jint fd, jlong offset, jint whence) {
    115 #if !defined(__APPLE__)
    116     // NOTE: Using TEMP_FAILURE_RETRY here is busted for LP32 on glibc - the return
    117     // value will be coerced into an int32_t.
    118     //
    119     // lseek64 isn't specified to return EINTR so it shouldn't be necessary
    120     // anyway.
    121     return lseek64(fd, offset, whence);
    122 #else
    123     // NOTE: This code is compiled for Mac OS but isn't ever run on that
    124     // platform.
    125     return lseek(fd, offset, whence);
    126 #endif
    127 }
    128 
    129 /*
    130  * "raw monitors" seem to be expected to behave like non-recursive pthread
    131  * mutexes.  They're used by ZipFile.
    132  */
    133 JNIEXPORT void* JVM_RawMonitorCreate(void) {
    134     pthread_mutex_t* mutex =
    135         reinterpret_cast<pthread_mutex_t*>(malloc(sizeof(pthread_mutex_t)));
    136     CHECK(mutex != nullptr);
    137     CHECK_PTHREAD_CALL(pthread_mutex_init, (mutex, nullptr), "JVM_RawMonitorCreate");
    138     return mutex;
    139 }
    140 
    141 JNIEXPORT void JVM_RawMonitorDestroy(void* mon) {
    142     CHECK_PTHREAD_CALL(pthread_mutex_destroy,
    143                        (reinterpret_cast<pthread_mutex_t*>(mon)),
    144                        "JVM_RawMonitorDestroy");
    145     free(mon);
    146 }
    147 
    148 JNIEXPORT jint JVM_RawMonitorEnter(void* mon) {
    149     return pthread_mutex_lock(reinterpret_cast<pthread_mutex_t*>(mon));
    150 }
    151 
    152 JNIEXPORT void JVM_RawMonitorExit(void* mon) {
    153     CHECK_PTHREAD_CALL(pthread_mutex_unlock,
    154                        (reinterpret_cast<pthread_mutex_t*>(mon)),
    155                        "JVM_RawMonitorExit");
    156 }
    157 
    158 JNIEXPORT char* JVM_NativePath(char* path) {
    159     return path;
    160 }
    161 
    162 JNIEXPORT jint JVM_GetLastErrorString(char* buf, int len) {
    163 #if defined(__GLIBC__) || defined(__BIONIC__)
    164   if (len == 0) {
    165     return 0;
    166   }
    167 
    168   const int err = errno;
    169   char* result = strerror_r(err, buf, len);
    170   if (result != buf) {
    171     strncpy(buf, result, len);
    172     buf[len - 1] = '\0';
    173   }
    174 
    175   return strlen(buf);
    176 #else
    177   UNUSED(buf);
    178   UNUSED(len);
    179   return -1;
    180 #endif
    181 }
    182 
    183 JNIEXPORT int jio_fprintf(FILE* fp, const char* fmt, ...) {
    184     va_list args;
    185 
    186     va_start(args, fmt);
    187     int len = jio_vfprintf(fp, fmt, args);
    188     va_end(args);
    189 
    190     return len;
    191 }
    192 
    193 JNIEXPORT int jio_vfprintf(FILE* fp, const char* fmt, va_list args) {
    194     assert(fp != NULL);
    195     return vfprintf(fp, fmt, args);
    196 }
    197 
    198 /* posix fsync() */
    199 JNIEXPORT jint JVM_Sync(jint fd) {
    200     return TEMP_FAILURE_RETRY(fsync(fd));
    201 }
    202 
    203 JNIEXPORT void* JVM_FindLibraryEntry(void* handle, const char* name) {
    204     return dlsym(handle, name);
    205 }
    206 
    207 JNIEXPORT jlong JVM_CurrentTimeMillis(JNIEnv* env ATTRIBUTE_UNUSED,
    208                                       jclass clazz ATTRIBUTE_UNUSED) {
    209     struct timeval tv;
    210     gettimeofday(&tv, (struct timezone *) NULL);
    211     jlong when = tv.tv_sec * 1000LL + tv.tv_usec / 1000;
    212     return when;
    213 }
    214 
    215 JNIEXPORT jint JVM_Socket(jint domain, jint type, jint protocol) {
    216     return TEMP_FAILURE_RETRY(socket(domain, type, protocol));
    217 }
    218 
    219 JNIEXPORT jint JVM_InitializeSocketLibrary() {
    220   return 0;
    221 }
    222 
    223 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
    224   if ((intptr_t)count <= 0) return -1;
    225   return vsnprintf(str, count, fmt, args);
    226 }
    227 
    228 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
    229   va_list args;
    230   int len;
    231   va_start(args, fmt);
    232   len = jio_vsnprintf(str, count, fmt, args);
    233   va_end(args);
    234   return len;
    235 }
    236 
    237 JNIEXPORT jint JVM_SetSockOpt(jint fd, int level, int optname,
    238     const char* optval, int optlen) {
    239   return TEMP_FAILURE_RETRY(setsockopt(fd, level, optname, optval, optlen));
    240 }
    241 
    242 JNIEXPORT jint JVM_SocketShutdown(jint fd, jint howto) {
    243   return TEMP_FAILURE_RETRY(shutdown(fd, howto));
    244 }
    245 
    246 JNIEXPORT jint JVM_GetSockOpt(jint fd, int level, int optname, char* optval,
    247   int* optlen) {
    248   socklen_t len = *optlen;
    249   int cc = TEMP_FAILURE_RETRY(getsockopt(fd, level, optname, optval, &len));
    250   *optlen = len;
    251   return cc;
    252 }
    253 
    254 JNIEXPORT jint JVM_GetSockName(jint fd, struct sockaddr* addr, int* addrlen) {
    255   socklen_t len = *addrlen;
    256   int cc = TEMP_FAILURE_RETRY(getsockname(fd, addr, &len));
    257   *addrlen = len;
    258   return cc;
    259 }
    260 
    261 JNIEXPORT jint JVM_SocketAvailable(jint fd, jint* result) {
    262   if (TEMP_FAILURE_RETRY(ioctl(fd, FIONREAD, result)) < 0) {
    263       return JNI_FALSE;
    264   }
    265 
    266   return JNI_TRUE;
    267 }
    268 
    269 JNIEXPORT jint JVM_Send(jint fd, char* buf, jint nBytes, jint flags) {
    270   return TEMP_FAILURE_RETRY(send(fd, buf, nBytes, flags));
    271 }
    272 
    273 JNIEXPORT jint JVM_SocketClose(jint fd) {
    274   // Don't want TEMP_FAILURE_RETRY here -- file is closed even if EINTR.
    275   return close(fd);
    276 }
    277 
    278 JNIEXPORT jint JVM_Listen(jint fd, jint count) {
    279   return TEMP_FAILURE_RETRY(listen(fd, count));
    280 }
    281 
    282 JNIEXPORT jint JVM_Connect(jint fd, struct sockaddr* addr, jint addrlen) {
    283   return TEMP_FAILURE_RETRY(connect(fd, addr, addrlen));
    284 }
    285 
    286 JNIEXPORT int JVM_GetHostName(char* name, int namelen) {
    287   return TEMP_FAILURE_RETRY(gethostname(name, namelen));
    288 }
    289 
    290 JNIEXPORT jstring JVM_InternString(JNIEnv* env, jstring jstr) {
    291   art::ScopedFastNativeObjectAccess soa(env);
    292   art::ObjPtr<art::mirror::String> s = soa.Decode<art::mirror::String>(jstr);
    293   return soa.AddLocalReference<jstring>(s->Intern());
    294 }
    295 
    296 JNIEXPORT jlong JVM_FreeMemory(void) {
    297   return art::Runtime::Current()->GetHeap()->GetFreeMemory();
    298 }
    299 
    300 JNIEXPORT jlong JVM_TotalMemory(void) {
    301   return art::Runtime::Current()->GetHeap()->GetTotalMemory();
    302 }
    303 
    304 JNIEXPORT jlong JVM_MaxMemory(void) {
    305   return art::Runtime::Current()->GetHeap()->GetMaxMemory();
    306 }
    307 
    308 JNIEXPORT void JVM_GC(void) {
    309   if (art::Runtime::Current()->IsExplicitGcDisabled()) {
    310       LOG(INFO) << "Explicit GC skipped.";
    311       return;
    312   }
    313   art::Runtime::Current()->GetHeap()->CollectGarbage(false);
    314 }
    315 
    316 JNIEXPORT __attribute__((noreturn)) void JVM_Exit(jint status) {
    317   LOG(INFO) << "System.exit called, status: " << status;
    318   art::Runtime::Current()->CallExitHook(status);
    319   exit(status);
    320 }
    321 
    322 JNIEXPORT jstring JVM_NativeLoad(JNIEnv* env,
    323                                  jstring javaFilename,
    324                                  jobject javaLoader,
    325                                  jstring javaLibrarySearchPath) {
    326   ScopedUtfChars filename(env, javaFilename);
    327   if (filename.c_str() == NULL) {
    328     return NULL;
    329   }
    330 
    331   std::string error_msg;
    332   {
    333     art::JavaVMExt* vm = art::Runtime::Current()->GetJavaVM();
    334     bool success = vm->LoadNativeLibrary(env,
    335                                          filename.c_str(),
    336                                          javaLoader,
    337                                          javaLibrarySearchPath,
    338                                          &error_msg);
    339     if (success) {
    340       return nullptr;
    341     }
    342   }
    343 
    344   // Don't let a pending exception from JNI_OnLoad cause a CheckJNI issue with NewStringUTF.
    345   env->ExceptionClear();
    346   return env->NewStringUTF(error_msg.c_str());
    347 }
    348 
    349 JNIEXPORT void JVM_StartThread(JNIEnv* env, jobject jthread, jlong stack_size, jboolean daemon) {
    350   art::Thread::CreateNativeThread(env, jthread, stack_size, daemon == JNI_TRUE);
    351 }
    352 
    353 JNIEXPORT void JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio) {
    354   art::ScopedObjectAccess soa(env);
    355   art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
    356   art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
    357   if (thread != NULL) {
    358     thread->SetNativePriority(prio);
    359   }
    360 }
    361 
    362 JNIEXPORT void JVM_Yield(JNIEnv* env ATTRIBUTE_UNUSED, jclass threadClass ATTRIBUTE_UNUSED) {
    363   sched_yield();
    364 }
    365 
    366 JNIEXPORT void JVM_Sleep(JNIEnv* env, jclass threadClass ATTRIBUTE_UNUSED,
    367                          jobject java_lock, jlong millis) {
    368   art::ScopedFastNativeObjectAccess soa(env);
    369   art::ObjPtr<art::mirror::Object> lock = soa.Decode<art::mirror::Object>(java_lock);
    370   art::Monitor::Wait(art::Thread::Current(), lock.Ptr(), millis, 0, true, art::kSleeping);
    371 }
    372 
    373 JNIEXPORT jobject JVM_CurrentThread(JNIEnv* env, jclass unused ATTRIBUTE_UNUSED) {
    374   art::ScopedFastNativeObjectAccess soa(env);
    375   return soa.AddLocalReference<jobject>(soa.Self()->GetPeer());
    376 }
    377 
    378 JNIEXPORT void JVM_Interrupt(JNIEnv* env, jobject jthread) {
    379   art::ScopedFastNativeObjectAccess soa(env);
    380   art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
    381   art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
    382   if (thread != nullptr) {
    383     thread->Interrupt(soa.Self());
    384   }
    385 }
    386 
    387 JNIEXPORT jboolean JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clearInterrupted) {
    388   if (clearInterrupted) {
    389     return static_cast<art::JNIEnvExt*>(env)->self->Interrupted() ? JNI_TRUE : JNI_FALSE;
    390   } else {
    391     art::ScopedFastNativeObjectAccess soa(env);
    392     art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
    393     art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
    394     return (thread != nullptr) ? thread->IsInterrupted() : JNI_FALSE;
    395   }
    396 }
    397 
    398 JNIEXPORT jboolean JVM_HoldsLock(JNIEnv* env, jclass unused ATTRIBUTE_UNUSED, jobject jobj) {
    399   art::ScopedObjectAccess soa(env);
    400   art::ObjPtr<art::mirror::Object> object = soa.Decode<art::mirror::Object>(jobj);
    401   if (object == nullptr) {
    402     art::ThrowNullPointerException("object == null");
    403     return JNI_FALSE;
    404   }
    405   return soa.Self()->HoldsLock(object.Ptr());
    406 }
    407 
    408 JNIEXPORT void JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring java_name) {
    409   ScopedUtfChars name(env, java_name);
    410   {
    411     art::ScopedObjectAccess soa(env);
    412     if (soa.Decode<art::mirror::Object>(jthread) == soa.Self()->GetPeer()) {
    413       soa.Self()->SetThreadName(name.c_str());
    414       return;
    415     }
    416   }
    417   // Suspend thread to avoid it from killing itself while we set its name. We don't just hold the
    418   // thread list lock to avoid this, as setting the thread name causes mutator to lock/unlock
    419   // in the DDMS send code.
    420   art::ThreadList* thread_list = art::Runtime::Current()->GetThreadList();
    421   bool timed_out;
    422   // Take suspend thread lock to avoid races with threads trying to suspend this one.
    423   art::Thread* thread;
    424   {
    425     thread = thread_list->SuspendThreadByPeer(jthread, true, false, &timed_out);
    426   }
    427   if (thread != NULL) {
    428     {
    429       art::ScopedObjectAccess soa(env);
    430       thread->SetThreadName(name.c_str());
    431     }
    432     thread_list->Resume(thread, false);
    433   } else if (timed_out) {
    434     LOG(ERROR) << "Trying to set thread name to '" << name.c_str() << "' failed as the thread "
    435         "failed to suspend within a generous timeout.";
    436   }
    437 }
    438 
    439 JNIEXPORT jint JVM_IHashCode(JNIEnv* env ATTRIBUTE_UNUSED,
    440                              jobject javaObject ATTRIBUTE_UNUSED) {
    441   UNIMPLEMENTED(FATAL) << "JVM_IHashCode is not implemented";
    442   return 0;
    443 }
    444 
    445 JNIEXPORT jlong JVM_NanoTime(JNIEnv* env ATTRIBUTE_UNUSED, jclass unused ATTRIBUTE_UNUSED) {
    446   UNIMPLEMENTED(FATAL) << "JVM_NanoTime is not implemented";
    447   return 0L;
    448 }
    449 
    450 JNIEXPORT void JVM_ArrayCopy(JNIEnv* /* env */, jclass /* unused */, jobject /* javaSrc */,
    451                              jint /* srcPos */, jobject /* javaDst */, jint /* dstPos */,
    452                              jint /* length */) {
    453   UNIMPLEMENTED(FATAL) << "JVM_ArrayCopy is not implemented";
    454 }
    455 
    456 JNIEXPORT jint JVM_FindSignal(const char* name ATTRIBUTE_UNUSED) {
    457   LOG(FATAL) << "JVM_FindSignal is not implemented";
    458   return 0;
    459 }
    460 
    461 JNIEXPORT void* JVM_RegisterSignal(jint signum ATTRIBUTE_UNUSED, void* handler ATTRIBUTE_UNUSED) {
    462   LOG(FATAL) << "JVM_RegisterSignal is not implemented";
    463   return nullptr;
    464 }
    465 
    466 JNIEXPORT jboolean JVM_RaiseSignal(jint signum ATTRIBUTE_UNUSED) {
    467   LOG(FATAL) << "JVM_RaiseSignal is not implemented";
    468   return JNI_FALSE;
    469 }
    470 
    471 JNIEXPORT __attribute__((noreturn))  void JVM_Halt(jint code) {
    472   exit(code);
    473 }
    474 
    475 JNIEXPORT jboolean JVM_IsNaN(jdouble d) {
    476   return isnan(d);
    477 }
    478