runtime/openjdkjvm/OpenjdkJvm.cc - platform/art - Gitiles

 /* Copyright (C) 2014 The Android Open Source Project
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This file implements interfaces from the file jvm.h. This implementation
  * is licensed under the same terms as the file jvm.h.  The
  * copyright and license information for the file jvm.h follows.
  *
  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 /*
  * Services that OpenJDK expects the VM to provide.
  */
 #include<stdio.h>
 #include <dlfcn.h>
 #include <limits.h>
 #include <unistd.h>

 #include "common_throws.h"
 #include "gc/heap.h"
 #include "thread.h"
 #include "thread_list.h"
 #include "runtime.h"
 #include "handle_scope-inl.h"
 #include "scoped_thread_state_change.h"
 #include "ScopedUtfChars.h"
 #include "mirror/class_loader.h"
 #include "verify_object-inl.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "../../libcore/ojluni/src/main/native/jvm.h"  // TODO(narayan): fix it
 #include "jni_internal.h"
 #include "mirror/string-inl.h"
 #include "native/scoped_fast_native_object_access.h"
 #include "ScopedLocalRef.h"
 #include <sys/time.h>
 #include <sys/socket.h>
 #include <sys/ioctl.h>

 #ifdef ART_TARGET_ANDROID
 // This function is provided by android linker.
 extern "C" void android_update_LD_LIBRARY_PATH(const char* ld_library_path);
 #endif  // ART_TARGET_ANDROID

 #undef LOG_TAG
 #define LOG_TAG "artopenjdk"

 using art::WARNING;
 using art::INFO;
 using art::ERROR;
 using art::FATAL;

 /* posix open() with extensions; used by e.g. ZipFile */
 JNIEXPORT jint JVM_Open(const char* fname, jint flags, jint mode) {
     /*
      * The call is expected to handle JVM_O_DELETE, which causes the file
      * to be removed after it is opened.  Also, some code seems to
      * want the special return value JVM_EEXIST if the file open fails
      * due to O_EXCL.
      */
     int fd = TEMP_FAILURE_RETRY(open(fname, flags & ~JVM_O_DELETE, mode));
     if (fd < 0) {
         int err = errno;
         if (err == EEXIST) {
             return JVM_EEXIST;
         } else {
             return -1;
         }
     }

     if (flags & JVM_O_DELETE) {
         if (unlink(fname) != 0) {
             LOG(WARNING) << "Post-open deletion of '" << fname << "' failed: " << strerror(errno);
         }
     }

     return fd;
 }

 /* posix close() */
 JNIEXPORT jint JVM_Close(jint fd) {
     // don't want TEMP_FAILURE_RETRY here -- file is closed even if EINTR
     return close(fd);
 }

 /* posix read() */
 JNIEXPORT jint JVM_Read(jint fd, char* buf, jint nbytes) {
     return TEMP_FAILURE_RETRY(read(fd, buf, nbytes));
 }

 /* posix write(); is used to write messages to stderr */
 JNIEXPORT jint JVM_Write(jint fd, char* buf, jint nbytes) {
     return TEMP_FAILURE_RETRY(write(fd, buf, nbytes));
 }

 /* posix lseek() */
 JNIEXPORT jlong JVM_Lseek(jint fd, jlong offset, jint whence) {
 #if !defined(__APPLE__)
     // NOTE: Using TEMP_FAILURE_RETRY here is busted for LP32 on glibc - the return
     // value will be coerced into an int32_t.
     //
     // lseek64 isn't specified to return EINTR so it shouldn't be necessary
     // anyway.
     return lseek64(fd, offset, whence);
 #else
     // NOTE: This code is compiled for Mac OS but isn't ever run on that
     // platform.
     return lseek(fd, offset, whence);
 #endif
 }

 /*
  * "raw monitors" seem to be expected to behave like non-recursive pthread
  * mutexes.  They're used by ZipFile.
  */
 JNIEXPORT void* JVM_RawMonitorCreate(void) {
     pthread_mutex_t* mutex =
         reinterpret_cast<pthread_mutex_t*>(malloc(sizeof(pthread_mutex_t)));
     CHECK(mutex != nullptr);
     CHECK_PTHREAD_CALL(pthread_mutex_init, (mutex, nullptr), "JVM_RawMonitorCreate");
     return mutex;
 }

 JNIEXPORT void JVM_RawMonitorDestroy(void* mon) {
     CHECK_PTHREAD_CALL(pthread_mutex_destroy,
                        (reinterpret_cast<pthread_mutex_t*>(mon)),
                        "JVM_RawMonitorDestroy");
     free(mon);
 }

 JNIEXPORT jint JVM_RawMonitorEnter(void* mon) {
     return pthread_mutex_lock(reinterpret_cast<pthread_mutex_t*>(mon));
 }

 JNIEXPORT void JVM_RawMonitorExit(void* mon) {
     CHECK_PTHREAD_CALL(pthread_mutex_unlock,
                        (reinterpret_cast<pthread_mutex_t*>(mon)),
                        "JVM_RawMonitorExit");
 }

 JNIEXPORT char* JVM_NativePath(char* path) {
     return path;
 }

 JNIEXPORT jint JVM_GetLastErrorString(char* buf, int len) {
 #if defined(__GLIBC__) || defined(__BIONIC__)
   if (len == 0) {
     return 0;
   }

   const int err = errno;
   char* result = strerror_r(err, buf, len);
   if (result != buf) {
     strncpy(buf, result, len);
     buf[len - 1] = '\0';
   }

   return strlen(buf);
 #else
   UNUSED(buf);
   UNUSED(len);
   return -1;
 #endif
 }

 JNIEXPORT int jio_fprintf(FILE* fp, const char* fmt, ...) {
     va_list args;

     va_start(args, fmt);
     int len = jio_vfprintf(fp, fmt, args);
     va_end(args);

     return len;
 }

 JNIEXPORT int jio_vfprintf(FILE* fp, const char* fmt, va_list args) {
     assert(fp != NULL);
     return vfprintf(fp, fmt, args);
 }

 /* posix fsync() */
 JNIEXPORT jint JVM_Sync(jint fd) {
     return TEMP_FAILURE_RETRY(fsync(fd));
 }

 JNIEXPORT void* JVM_FindLibraryEntry(void* handle, const char* name) {
     return dlsym(handle, name);
 }

 JNIEXPORT jlong JVM_CurrentTimeMillis(JNIEnv* env ATTRIBUTE_UNUSED,
                                       jclass clazz ATTRIBUTE_UNUSED) {
     struct timeval tv;
     gettimeofday(&tv, (struct timezone *) NULL);
     jlong when = tv.tv_sec * 1000LL + tv.tv_usec / 1000;
     return when;
 }

 JNIEXPORT jint JVM_Socket(jint domain, jint type, jint protocol) {
     return TEMP_FAILURE_RETRY(socket(domain, type, protocol));
 }

 JNIEXPORT jint JVM_InitializeSocketLibrary() {
   return 0;
 }

 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
   if ((intptr_t)count <= 0) return -1;
   return vsnprintf(str, count, fmt, args);
 }

 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
   va_list args;
   int len;
   va_start(args, fmt);
   len = jio_vsnprintf(str, count, fmt, args);
   va_end(args);
   return len;
 }

 JNIEXPORT jint JVM_SetSockOpt(jint fd, int level, int optname,
     const char* optval, int optlen) {
   return TEMP_FAILURE_RETRY(setsockopt(fd, level, optname, optval, optlen));
 }

 JNIEXPORT jint JVM_SocketShutdown(jint fd, jint howto) {
   return TEMP_FAILURE_RETRY(shutdown(fd, howto));
 }

 JNIEXPORT jint JVM_GetSockOpt(jint fd, int level, int optname, char* optval,
   int* optlen) {
   socklen_t len = *optlen;
   int cc = TEMP_FAILURE_RETRY(getsockopt(fd, level, optname, optval, &len));
   *optlen = len;
   return cc;
 }

 JNIEXPORT jint JVM_GetSockName(jint fd, struct sockaddr* addr, int* addrlen) {
   socklen_t len = *addrlen;
   int cc = TEMP_FAILURE_RETRY(getsockname(fd, addr, &len));
   *addrlen = len;
   return cc;
 }

 JNIEXPORT jint JVM_SocketAvailable(jint fd, jint* result) {
   if (TEMP_FAILURE_RETRY(ioctl(fd, FIONREAD, result)) < 0) {
       return JNI_FALSE;
   }

   return JNI_TRUE;
 }

 JNIEXPORT jint JVM_Send(jint fd, char* buf, jint nBytes, jint flags) {
   return TEMP_FAILURE_RETRY(send(fd, buf, nBytes, flags));
 }

 JNIEXPORT jint JVM_SocketClose(jint fd) {
   // Don't want TEMP_FAILURE_RETRY here -- file is closed even if EINTR.
   return close(fd);
 }

 JNIEXPORT jint JVM_Listen(jint fd, jint count) {
   return TEMP_FAILURE_RETRY(listen(fd, count));
 }

 JNIEXPORT jint JVM_Connect(jint fd, struct sockaddr* addr, jint addrlen) {
   return TEMP_FAILURE_RETRY(connect(fd, addr, addrlen));
 }

 JNIEXPORT int JVM_GetHostName(char* name, int namelen) {
   return TEMP_FAILURE_RETRY(gethostname(name, namelen));
 }

 JNIEXPORT jstring JVM_InternString(JNIEnv* env, jstring jstr) {
   art::ScopedFastNativeObjectAccess soa(env);
   art::mirror::String* s = soa.Decode<art::mirror::String*>(jstr);
   art::mirror::String* result = s->Intern();
   return soa.AddLocalReference<jstring>(result);
 }

 JNIEXPORT jlong JVM_FreeMemory(void) {
   return art::Runtime::Current()->GetHeap()->GetFreeMemory();
 }

 JNIEXPORT jlong JVM_TotalMemory(void) {
   return art::Runtime::Current()->GetHeap()->GetTotalMemory();
 }

 JNIEXPORT jlong JVM_MaxMemory(void) {
   return art::Runtime::Current()->GetHeap()->GetMaxMemory();
 }

 JNIEXPORT void JVM_GC(void) {
   if (art::Runtime::Current()->IsExplicitGcDisabled()) {
       LOG(INFO) << "Explicit GC skipped.";
       return;
   }
   art::Runtime::Current()->GetHeap()->CollectGarbage(false);
 }

 JNIEXPORT __attribute__((noreturn)) void JVM_Exit(jint status) {
   LOG(INFO) << "System.exit called, status: " << status;
   art::Runtime::Current()->CallExitHook(status);
   exit(status);
 }

 static void SetLdLibraryPath(JNIEnv* env, jstring javaLdLibraryPath) {
 #ifdef ART_TARGET_ANDROID
   if (javaLdLibraryPath != nullptr) {
     ScopedUtfChars ldLibraryPath(env, javaLdLibraryPath);
     if (ldLibraryPath.c_str() != nullptr) {
       android_update_LD_LIBRARY_PATH(ldLibraryPath.c_str());
     }
   }

 #else
   LOG(WARNING) << "android_update_LD_LIBRARY_PATH not found; .so dependencies will not work!";
   UNUSED(javaLdLibraryPath, env);
 #endif
 }


 JNIEXPORT jstring JVM_NativeLoad(JNIEnv* env,
                                  jstring javaFilename,
                                  jobject javaLoader,
                                  jstring javaLibrarySearchPath) {
   ScopedUtfChars filename(env, javaFilename);
   if (filename.c_str() == NULL) {
     return NULL;
   }

   int32_t target_sdk_version = art::Runtime::Current()->GetTargetSdkVersion();

   // Starting with N nativeLoad uses classloader local
   // linker namespace instead of global LD_LIBRARY_PATH
   // (23 is Marshmallow). This call is here to preserve
   // backwards compatibility for the apps targeting sdk
   // version <= 23
   if (target_sdk_version == 0) {
     SetLdLibraryPath(env, javaLibrarySearchPath);
   }

   std::string error_msg;
   {
     art::JavaVMExt* vm = art::Runtime::Current()->GetJavaVM();
     bool success = vm->LoadNativeLibrary(env,
                                          filename.c_str(),
                                          javaLoader,
                                          javaLibrarySearchPath,
                                          &error_msg);
     if (success) {
       return nullptr;
     }
   }

   // Don't let a pending exception from JNI_OnLoad cause a CheckJNI issue with NewStringUTF.
   env->ExceptionClear();
   return env->NewStringUTF(error_msg.c_str());
 }

 JNIEXPORT void JVM_StartThread(JNIEnv* env, jobject jthread, jlong stack_size, jboolean daemon) {
   art::Thread::CreateNativeThread(env, jthread, stack_size, daemon == JNI_TRUE);
 }

 JNIEXPORT void JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio) {
   art::ScopedObjectAccess soa(env);
   art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
   art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
   if (thread != NULL) {
     thread->SetNativePriority(prio);
   }
 }

 JNIEXPORT void JVM_Yield(JNIEnv* env ATTRIBUTE_UNUSED, jclass threadClass ATTRIBUTE_UNUSED) {
   sched_yield();
 }

 JNIEXPORT void JVM_Sleep(JNIEnv* env, jclass threadClass ATTRIBUTE_UNUSED,
                          jobject java_lock, jlong millis) {
   art::ScopedFastNativeObjectAccess soa(env);
   art::mirror::Object* lock = soa.Decode<art::mirror::Object*>(java_lock);
   art::Monitor::Wait(art::Thread::Current(), lock, millis, 0, true, art::kSleeping);
 }

 JNIEXPORT jobject JVM_CurrentThread(JNIEnv* env, jclass unused ATTRIBUTE_UNUSED) {
   art::ScopedFastNativeObjectAccess soa(env);
   return soa.AddLocalReference<jobject>(soa.Self()->GetPeer());
 }

 JNIEXPORT void JVM_Interrupt(JNIEnv* env, jobject jthread) {
   art::ScopedFastNativeObjectAccess soa(env);
   art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
   art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
   if (thread != nullptr) {
     thread->Interrupt(soa.Self());
   }
 }

 JNIEXPORT jboolean JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clearInterrupted) {
   if (clearInterrupted) {
     return static_cast<art::JNIEnvExt*>(env)->self->Interrupted() ? JNI_TRUE : JNI_FALSE;
   } else {
     art::ScopedFastNativeObjectAccess soa(env);
     art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
     art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
     return (thread != nullptr) ? thread->IsInterrupted() : JNI_FALSE;
   }
 }

 JNIEXPORT jboolean JVM_HoldsLock(JNIEnv* env, jclass unused ATTRIBUTE_UNUSED, jobject jobj) {
   art::ScopedObjectAccess soa(env);
   art::mirror::Object* object = soa.Decode<art::mirror::Object*>(jobj);
   if (object == NULL) {
     art::ThrowNullPointerException("object == null");
     return JNI_FALSE;
   }
   return soa.Self()->HoldsLock(object);
 }

 JNIEXPORT void JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring java_name) {
   ScopedUtfChars name(env, java_name);
   {
     art::ScopedObjectAccess soa(env);
     if (soa.Decode<art::mirror::Object*>(jthread) == soa.Self()->GetPeer()) {
       soa.Self()->SetThreadName(name.c_str());
       return;
     }
   }
   // Suspend thread to avoid it from killing itself while we set its name. We don't just hold the
   // thread list lock to avoid this, as setting the thread name causes mutator to lock/unlock
   // in the DDMS send code.
   art::ThreadList* thread_list = art::Runtime::Current()->GetThreadList();
   bool timed_out;
   // Take suspend thread lock to avoid races with threads trying to suspend this one.
   art::Thread* thread;
   {
     thread = thread_list->SuspendThreadByPeer(jthread, true, false, &timed_out);
   }
   if (thread != NULL) {
     {
       art::ScopedObjectAccess soa(env);
       thread->SetThreadName(name.c_str());
     }
     thread_list->Resume(thread, false);
   } else if (timed_out) {
     LOG(ERROR) << "Trying to set thread name to '" << name.c_str() << "' failed as the thread "
         "failed to suspend within a generous timeout.";
   }
 }

 JNIEXPORT jint JVM_IHashCode(JNIEnv* env ATTRIBUTE_UNUSED,
                              jobject javaObject ATTRIBUTE_UNUSED) {
   UNIMPLEMENTED(FATAL) << "JVM_IHashCode is not implemented";
   return 0;
 }

 JNIEXPORT jlong JVM_NanoTime(JNIEnv* env ATTRIBUTE_UNUSED, jclass unused ATTRIBUTE_UNUSED) {
   UNIMPLEMENTED(FATAL) << "JVM_NanoTime is not implemented";
   return 0L;
 }

 JNIEXPORT void JVM_ArrayCopy(JNIEnv* /* env */, jclass /* unused */, jobject /* javaSrc */,
                              jint /* srcPos */, jobject /* javaDst */, jint /* dstPos */,
                              jint /* length */) {
   UNIMPLEMENTED(FATAL) << "JVM_ArrayCopy is not implemented";
 }

 JNIEXPORT jint JVM_FindSignal(const char* name ATTRIBUTE_UNUSED) {
   LOG(FATAL) << "JVM_FindSignal is not implemented";
   return 0;
 }

 JNIEXPORT void* JVM_RegisterSignal(jint signum ATTRIBUTE_UNUSED, void* handler ATTRIBUTE_UNUSED) {
   LOG(FATAL) << "JVM_RegisterSignal is not implemented";
   return nullptr;
 }

 JNIEXPORT jboolean JVM_RaiseSignal(jint signum ATTRIBUTE_UNUSED) {
   LOG(FATAL) << "JVM_RaiseSignal is not implemented";
   return JNI_FALSE;
 }

 JNIEXPORT __attribute__((noreturn))  void JVM_Halt(jint code) {
   exit(code);
 }

 JNIEXPORT jboolean JVM_IsNaN(jdouble d) {
   return isnan(d);
 }
	/* Copyright (C) 2014 The Android Open Source Project
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This file implements interfaces from the file jvm.h. This implementation
	* is licensed under the same terms as the file jvm.h. The
	* copyright and license information for the file jvm.h follows.
	*
	* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* Services that OpenJDK expects the VM to provide.
	*/
	#include<stdio.h>
	#include <dlfcn.h>
	#include <limits.h>
	#include <unistd.h>

	#include "common_throws.h"
	#include "gc/heap.h"
	#include "thread.h"
	#include "thread_list.h"
	#include "runtime.h"
	#include "handle_scope-inl.h"
	#include "scoped_thread_state_change.h"
	#include "ScopedUtfChars.h"
	#include "mirror/class_loader.h"
	#include "verify_object-inl.h"
	#include "base/logging.h"
	#include "base/macros.h"
	#include "../../libcore/ojluni/src/main/native/jvm.h" // TODO(narayan): fix it
	#include "jni_internal.h"
	#include "mirror/string-inl.h"
	#include "native/scoped_fast_native_object_access.h"
	#include "ScopedLocalRef.h"
	#include <sys/time.h>
	#include <sys/socket.h>
	#include <sys/ioctl.h>

	#ifdef ART_TARGET_ANDROID
	// This function is provided by android linker.
	extern "C" void android_update_LD_LIBRARY_PATH(const char* ld_library_path);
	#endif // ART_TARGET_ANDROID

	#undef LOG_TAG
	#define LOG_TAG "artopenjdk"

	using art::WARNING;
	using art::INFO;
	using art::ERROR;
	using art::FATAL;

	/* posix open() with extensions; used by e.g. ZipFile */
	JNIEXPORT jint JVM_Open(const char* fname, jint flags, jint mode) {
	/*
	* The call is expected to handle JVM_O_DELETE, which causes the file
	* to be removed after it is opened. Also, some code seems to
	* want the special return value JVM_EEXIST if the file open fails
	* due to O_EXCL.
	*/
	int fd = TEMP_FAILURE_RETRY(open(fname, flags & ~JVM_O_DELETE, mode));
	if (fd < 0) {
	int err = errno;
	if (err == EEXIST) {
	return JVM_EEXIST;
	} else {
	return -1;
	}
	}

	if (flags & JVM_O_DELETE) {
	if (unlink(fname) != 0) {
	LOG(WARNING) << "Post-open deletion of '" << fname << "' failed: " << strerror(errno);
	}
	}

	return fd;
	}

	/* posix close() */
	JNIEXPORT jint JVM_Close(jint fd) {
	// don't want TEMP_FAILURE_RETRY here -- file is closed even if EINTR
	return close(fd);
	}

	/* posix read() */
	JNIEXPORT jint JVM_Read(jint fd, char* buf, jint nbytes) {
	return TEMP_FAILURE_RETRY(read(fd, buf, nbytes));
	}

	/* posix write(); is used to write messages to stderr */
	JNIEXPORT jint JVM_Write(jint fd, char* buf, jint nbytes) {
	return TEMP_FAILURE_RETRY(write(fd, buf, nbytes));
	}

	/* posix lseek() */
	JNIEXPORT jlong JVM_Lseek(jint fd, jlong offset, jint whence) {
	#if !defined(__APPLE__)
	// NOTE: Using TEMP_FAILURE_RETRY here is busted for LP32 on glibc - the return
	// value will be coerced into an int32_t.
	//
	// lseek64 isn't specified to return EINTR so it shouldn't be necessary
	// anyway.
	return lseek64(fd, offset, whence);
	#else
	// NOTE: This code is compiled for Mac OS but isn't ever run on that
	// platform.
	return lseek(fd, offset, whence);
	#endif
	}

	/*
	* "raw monitors" seem to be expected to behave like non-recursive pthread
	* mutexes. They're used by ZipFile.
	*/
	JNIEXPORT void* JVM_RawMonitorCreate(void) {
	pthread_mutex_t* mutex =
	reinterpret_cast<pthread_mutex_t*>(malloc(sizeof(pthread_mutex_t)));
	CHECK(mutex != nullptr);
	CHECK_PTHREAD_CALL(pthread_mutex_init, (mutex, nullptr), "JVM_RawMonitorCreate");
	return mutex;
	}

	JNIEXPORT void JVM_RawMonitorDestroy(void* mon) {
	CHECK_PTHREAD_CALL(pthread_mutex_destroy,
	(reinterpret_cast<pthread_mutex_t*>(mon)),
	"JVM_RawMonitorDestroy");
	free(mon);
	}

	JNIEXPORT jint JVM_RawMonitorEnter(void* mon) {
	return pthread_mutex_lock(reinterpret_cast<pthread_mutex_t*>(mon));
	}

	JNIEXPORT void JVM_RawMonitorExit(void* mon) {
	CHECK_PTHREAD_CALL(pthread_mutex_unlock,
	(reinterpret_cast<pthread_mutex_t*>(mon)),
	"JVM_RawMonitorExit");
	}

	JNIEXPORT char* JVM_NativePath(char* path) {
	return path;
	}

	JNIEXPORT jint JVM_GetLastErrorString(char* buf, int len) {
	#if defined(__GLIBC__) \|\| defined(__BIONIC__)
	if (len == 0) {
	return 0;
	}

	const int err = errno;
	char* result = strerror_r(err, buf, len);
	if (result != buf) {
	strncpy(buf, result, len);
	buf[len - 1] = '\0';
	}

	return strlen(buf);
	#else
	UNUSED(buf);
	UNUSED(len);
	return -1;
	#endif
	}

	JNIEXPORT int jio_fprintf(FILE* fp, const char* fmt, ...) {
	va_list args;

	va_start(args, fmt);
	int len = jio_vfprintf(fp, fmt, args);
	va_end(args);

	return len;
	}

	JNIEXPORT int jio_vfprintf(FILE* fp, const char* fmt, va_list args) {
	assert(fp != NULL);
	return vfprintf(fp, fmt, args);
	}

	/* posix fsync() */
	JNIEXPORT jint JVM_Sync(jint fd) {
	return TEMP_FAILURE_RETRY(fsync(fd));
	}

	JNIEXPORT void* JVM_FindLibraryEntry(void* handle, const char* name) {
	return dlsym(handle, name);
	}

	JNIEXPORT jlong JVM_CurrentTimeMillis(JNIEnv* env ATTRIBUTE_UNUSED,
	jclass clazz ATTRIBUTE_UNUSED) {
	struct timeval tv;
	gettimeofday(&tv, (struct timezone *) NULL);
	jlong when = tv.tv_sec * 1000LL + tv.tv_usec / 1000;
	return when;
	}

	JNIEXPORT jint JVM_Socket(jint domain, jint type, jint protocol) {
	return TEMP_FAILURE_RETRY(socket(domain, type, protocol));
	}

	JNIEXPORT jint JVM_InitializeSocketLibrary() {
	return 0;
	}

	int jio_vsnprintf(char str, size_t count, const char fmt, va_list args) {
	if ((intptr_t)count <= 0) return -1;
	return vsnprintf(str, count, fmt, args);
	}

	int jio_snprintf(char str, size_t count, const char fmt, ...) {
	va_list args;
	int len;
	va_start(args, fmt);
	len = jio_vsnprintf(str, count, fmt, args);
	va_end(args);
	return len;
	}

	JNIEXPORT jint JVM_SetSockOpt(jint fd, int level, int optname,
	const char* optval, int optlen) {
	return TEMP_FAILURE_RETRY(setsockopt(fd, level, optname, optval, optlen));
	}

	JNIEXPORT jint JVM_SocketShutdown(jint fd, jint howto) {
	return TEMP_FAILURE_RETRY(shutdown(fd, howto));
	}

	JNIEXPORT jint JVM_GetSockOpt(jint fd, int level, int optname, char* optval,
	int* optlen) {
	socklen_t len = *optlen;
	int cc = TEMP_FAILURE_RETRY(getsockopt(fd, level, optname, optval, &len));
	*optlen = len;
	return cc;
	}

	JNIEXPORT jint JVM_GetSockName(jint fd, struct sockaddr* addr, int* addrlen) {
	socklen_t len = *addrlen;
	int cc = TEMP_FAILURE_RETRY(getsockname(fd, addr, &len));
	*addrlen = len;
	return cc;
	}

	JNIEXPORT jint JVM_SocketAvailable(jint fd, jint* result) {
	if (TEMP_FAILURE_RETRY(ioctl(fd, FIONREAD, result)) < 0) {
	return JNI_FALSE;
	}

	return JNI_TRUE;
	}

	JNIEXPORT jint JVM_Send(jint fd, char* buf, jint nBytes, jint flags) {
	return TEMP_FAILURE_RETRY(send(fd, buf, nBytes, flags));
	}

	JNIEXPORT jint JVM_SocketClose(jint fd) {
	// Don't want TEMP_FAILURE_RETRY here -- file is closed even if EINTR.
	return close(fd);
	}

	JNIEXPORT jint JVM_Listen(jint fd, jint count) {
	return TEMP_FAILURE_RETRY(listen(fd, count));
	}

	JNIEXPORT jint JVM_Connect(jint fd, struct sockaddr* addr, jint addrlen) {
	return TEMP_FAILURE_RETRY(connect(fd, addr, addrlen));
	}

	JNIEXPORT int JVM_GetHostName(char* name, int namelen) {
	return TEMP_FAILURE_RETRY(gethostname(name, namelen));
	}

	JNIEXPORT jstring JVM_InternString(JNIEnv* env, jstring jstr) {
	art::ScopedFastNativeObjectAccess soa(env);
	art::mirror::String* s = soa.Decode<art::mirror::String*>(jstr);
	art::mirror::String* result = s->Intern();
	return soa.AddLocalReference<jstring>(result);
	}

	JNIEXPORT jlong JVM_FreeMemory(void) {
	return art::Runtime::Current()->GetHeap()->GetFreeMemory();
	}

	JNIEXPORT jlong JVM_TotalMemory(void) {
	return art::Runtime::Current()->GetHeap()->GetTotalMemory();
	}

	JNIEXPORT jlong JVM_MaxMemory(void) {
	return art::Runtime::Current()->GetHeap()->GetMaxMemory();
	}

	JNIEXPORT void JVM_GC(void) {
	if (art::Runtime::Current()->IsExplicitGcDisabled()) {
	LOG(INFO) << "Explicit GC skipped.";
	return;
	}
	art::Runtime::Current()->GetHeap()->CollectGarbage(false);
	}

	JNIEXPORT __attribute__((noreturn)) void JVM_Exit(jint status) {
	LOG(INFO) << "System.exit called, status: " << status;
	art::Runtime::Current()->CallExitHook(status);
	exit(status);
	}

	static void SetLdLibraryPath(JNIEnv* env, jstring javaLdLibraryPath) {
	#ifdef ART_TARGET_ANDROID
	if (javaLdLibraryPath != nullptr) {
	ScopedUtfChars ldLibraryPath(env, javaLdLibraryPath);
	if (ldLibraryPath.c_str() != nullptr) {
	android_update_LD_LIBRARY_PATH(ldLibraryPath.c_str());
	}
	}

	#else
	LOG(WARNING) << "android_update_LD_LIBRARY_PATH not found; .so dependencies will not work!";
	UNUSED(javaLdLibraryPath, env);
	#endif
	}


	JNIEXPORT jstring JVM_NativeLoad(JNIEnv* env,
	jstring javaFilename,
	jobject javaLoader,
	jstring javaLibrarySearchPath) {
	ScopedUtfChars filename(env, javaFilename);
	if (filename.c_str() == NULL) {
	return NULL;
	}

	int32_t target_sdk_version = art::Runtime::Current()->GetTargetSdkVersion();

	// Starting with N nativeLoad uses classloader local
	// linker namespace instead of global LD_LIBRARY_PATH
	// (23 is Marshmallow). This call is here to preserve
	// backwards compatibility for the apps targeting sdk
	// version <= 23
	if (target_sdk_version == 0) {
	SetLdLibraryPath(env, javaLibrarySearchPath);
	}

	std::string error_msg;
	{
	art::JavaVMExt* vm = art::Runtime::Current()->GetJavaVM();
	bool success = vm->LoadNativeLibrary(env,
	filename.c_str(),
	javaLoader,
	javaLibrarySearchPath,
	&error_msg);
	if (success) {
	return nullptr;
	}
	}

	// Don't let a pending exception from JNI_OnLoad cause a CheckJNI issue with NewStringUTF.
	env->ExceptionClear();
	return env->NewStringUTF(error_msg.c_str());
	}

	JNIEXPORT void JVM_StartThread(JNIEnv* env, jobject jthread, jlong stack_size, jboolean daemon) {
	art::Thread::CreateNativeThread(env, jthread, stack_size, daemon == JNI_TRUE);
	}

	JNIEXPORT void JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio) {
	art::ScopedObjectAccess soa(env);
	art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
	art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
	if (thread != NULL) {
	thread->SetNativePriority(prio);
	}
	}

	JNIEXPORT void JVM_Yield(JNIEnv* env ATTRIBUTE_UNUSED, jclass threadClass ATTRIBUTE_UNUSED) {
	sched_yield();
	}

	JNIEXPORT void JVM_Sleep(JNIEnv* env, jclass threadClass ATTRIBUTE_UNUSED,
	jobject java_lock, jlong millis) {
	art::ScopedFastNativeObjectAccess soa(env);
	art::mirror::Object* lock = soa.Decode<art::mirror::Object*>(java_lock);
	art::Monitor::Wait(art::Thread::Current(), lock, millis, 0, true, art::kSleeping);
	}

	JNIEXPORT jobject JVM_CurrentThread(JNIEnv* env, jclass unused ATTRIBUTE_UNUSED) {
	art::ScopedFastNativeObjectAccess soa(env);
	return soa.AddLocalReference<jobject>(soa.Self()->GetPeer());
	}

	JNIEXPORT void JVM_Interrupt(JNIEnv* env, jobject jthread) {
	art::ScopedFastNativeObjectAccess soa(env);
	art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
	art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
	if (thread != nullptr) {
	thread->Interrupt(soa.Self());
	}
	}

	JNIEXPORT jboolean JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clearInterrupted) {
	if (clearInterrupted) {
	return static_cast<art::JNIEnvExt*>(env)->self->Interrupted() ? JNI_TRUE : JNI_FALSE;
	} else {
	art::ScopedFastNativeObjectAccess soa(env);
	art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
	art::Thread* thread = art::Thread::FromManagedThread(soa, jthread);
	return (thread != nullptr) ? thread->IsInterrupted() : JNI_FALSE;
	}
	}

	JNIEXPORT jboolean JVM_HoldsLock(JNIEnv* env, jclass unused ATTRIBUTE_UNUSED, jobject jobj) {
	art::ScopedObjectAccess soa(env);
	art::mirror::Object* object = soa.Decode<art::mirror::Object*>(jobj);
	if (object == NULL) {
	art::ThrowNullPointerException("object == null");
	return JNI_FALSE;
	}
	return soa.Self()->HoldsLock(object);
	}

	JNIEXPORT void JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring java_name) {
	ScopedUtfChars name(env, java_name);
	{
	art::ScopedObjectAccess soa(env);
	if (soa.Decode<art::mirror::Object*>(jthread) == soa.Self()->GetPeer()) {
	soa.Self()->SetThreadName(name.c_str());
	return;
	}
	}
	// Suspend thread to avoid it from killing itself while we set its name. We don't just hold the
	// thread list lock to avoid this, as setting the thread name causes mutator to lock/unlock
	// in the DDMS send code.
	art::ThreadList* thread_list = art::Runtime::Current()->GetThreadList();
	bool timed_out;
	// Take suspend thread lock to avoid races with threads trying to suspend this one.
	art::Thread* thread;
	{
	thread = thread_list->SuspendThreadByPeer(jthread, true, false, &timed_out);
	}
	if (thread != NULL) {
	{
	art::ScopedObjectAccess soa(env);
	thread->SetThreadName(name.c_str());
	}
	thread_list->Resume(thread, false);
	} else if (timed_out) {
	LOG(ERROR) << "Trying to set thread name to '" << name.c_str() << "' failed as the thread "
	"failed to suspend within a generous timeout.";
	}
	}

	JNIEXPORT jint JVM_IHashCode(JNIEnv* env ATTRIBUTE_UNUSED,
	jobject javaObject ATTRIBUTE_UNUSED) {
	UNIMPLEMENTED(FATAL) << "JVM_IHashCode is not implemented";
	return 0;
	}

	JNIEXPORT jlong JVM_NanoTime(JNIEnv* env ATTRIBUTE_UNUSED, jclass unused ATTRIBUTE_UNUSED) {
	UNIMPLEMENTED(FATAL) << "JVM_NanoTime is not implemented";
	return 0L;
	}

	JNIEXPORT void JVM_ArrayCopy(JNIEnv* /* env /, jclass / unused /, jobject / javaSrc */,
	jint /* srcPos /, jobject / javaDst /, jint / dstPos */,
	jint /* length */) {
	UNIMPLEMENTED(FATAL) << "JVM_ArrayCopy is not implemented";
	}

	JNIEXPORT jint JVM_FindSignal(const char* name ATTRIBUTE_UNUSED) {
	LOG(FATAL) << "JVM_FindSignal is not implemented";
	return 0;
	}

	JNIEXPORT void* JVM_RegisterSignal(jint signum ATTRIBUTE_UNUSED, void* handler ATTRIBUTE_UNUSED) {
	LOG(FATAL) << "JVM_RegisterSignal is not implemented";
	return nullptr;
	}

	JNIEXPORT jboolean JVM_RaiseSignal(jint signum ATTRIBUTE_UNUSED) {
	LOG(FATAL) << "JVM_RaiseSignal is not implemented";
	return JNI_FALSE;
	}

	JNIEXPORT __attribute__((noreturn)) void JVM_Halt(jint code) {
	exit(code);
	}

	JNIEXPORT jboolean JVM_IsNaN(jdouble d) {
	return isnan(d);
	}