runtime/native/dalvik_system_VMDebug.cc - SHIFTPHONES/android_art - Gitiles

 /*
  * Copyright (C) 2008 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "dalvik_system_VMDebug.h"

 #include <string.h>
 #include <unistd.h>

 #include <sstream>

 #include "base/histogram-inl.h"
 #include "base/time_utils.h"
 #include "class_linker.h"
 #include "common_throws.h"
 #include "debugger.h"
 #include "gc/space/bump_pointer_space.h"
 #include "gc/space/dlmalloc_space.h"
 #include "gc/space/large_object_space.h"
 #include "gc/space/space-inl.h"
 #include "gc/space/zygote_space.h"
 #include "hprof/hprof.h"
 #include "jni_internal.h"
 #include "mirror/class.h"
 #include "ScopedLocalRef.h"
 #include "ScopedUtfChars.h"
 #include "scoped_fast_native_object_access-inl.h"
 #include "trace.h"
 #include "well_known_classes.h"

 namespace art {

 static jobjectArray VMDebug_getVmFeatureList(JNIEnv* env, jclass) {
   static const char* features[] = {
     "method-trace-profiling",
     "method-trace-profiling-streaming",
     "method-sample-profiling",
     "hprof-heap-dump",
     "hprof-heap-dump-streaming",
   };
   jobjectArray result = env->NewObjectArray(arraysize(features),
                                             WellKnownClasses::java_lang_String,
                                             nullptr);
   if (result != nullptr) {
     for (size_t i = 0; i < arraysize(features); ++i) {
       ScopedLocalRef<jstring> jfeature(env, env->NewStringUTF(features[i]));
       if (jfeature.get() == nullptr) {
         return nullptr;
       }
       env->SetObjectArrayElement(result, i, jfeature.get());
     }
   }
   return result;
 }

 static void VMDebug_startAllocCounting(JNIEnv*, jclass) {
   Runtime::Current()->SetStatsEnabled(true);
 }

 static void VMDebug_stopAllocCounting(JNIEnv*, jclass) {
   Runtime::Current()->SetStatsEnabled(false);
 }

 static jint VMDebug_getAllocCount(JNIEnv*, jclass, jint kind) {
   return Runtime::Current()->GetStat(kind);
 }

 static void VMDebug_resetAllocCount(JNIEnv*, jclass, jint kinds) {
   Runtime::Current()->ResetStats(kinds);
 }

 static void VMDebug_startMethodTracingDdmsImpl(JNIEnv*, jclass, jint bufferSize, jint flags,
                                                jboolean samplingEnabled, jint intervalUs) {
   Trace::Start("[DDMS]", -1, bufferSize, flags, Trace::TraceOutputMode::kDDMS,
                samplingEnabled ? Trace::TraceMode::kSampling : Trace::TraceMode::kMethodTracing,
                intervalUs);
 }

 static void VMDebug_startMethodTracingFd(JNIEnv* env, jclass, jstring javaTraceFilename,
                                          jobject javaFd, jint bufferSize, jint flags,
                                          jboolean samplingEnabled, jint intervalUs) {
   int originalFd = jniGetFDFromFileDescriptor(env, javaFd);
   if (originalFd < 0) {
     return;
   }

   int fd = dup(originalFd);
   if (fd < 0) {
     ScopedObjectAccess soa(env);
     soa.Self()->ThrowNewExceptionF("Ljava/lang/RuntimeException;",
                                    "dup(%d) failed: %s", originalFd, strerror(errno));
     return;
   }

   ScopedUtfChars traceFilename(env, javaTraceFilename);
   if (traceFilename.c_str() == nullptr) {
     return;
   }
   Trace::Start(traceFilename.c_str(), fd, bufferSize, flags, Trace::TraceOutputMode::kFile,
                samplingEnabled ? Trace::TraceMode::kSampling : Trace::TraceMode::kMethodTracing,
                intervalUs);
 }

 static void VMDebug_startMethodTracingFilename(JNIEnv* env, jclass, jstring javaTraceFilename,
                                                jint bufferSize, jint flags,
                                                jboolean samplingEnabled, jint intervalUs) {
   ScopedUtfChars traceFilename(env, javaTraceFilename);
   if (traceFilename.c_str() == nullptr) {
     return;
   }
   Trace::Start(traceFilename.c_str(), -1, bufferSize, flags, Trace::TraceOutputMode::kFile,
                samplingEnabled ? Trace::TraceMode::kSampling : Trace::TraceMode::kMethodTracing,
                intervalUs);
 }

 static jint VMDebug_getMethodTracingMode(JNIEnv*, jclass) {
   return Trace::GetMethodTracingMode();
 }

 static void VMDebug_stopMethodTracing(JNIEnv*, jclass) {
   Trace::Stop();
 }

 static void VMDebug_startEmulatorTracing(JNIEnv*, jclass) {
   UNIMPLEMENTED(WARNING);
   // dvmEmulatorTraceStart();
 }

 static void VMDebug_stopEmulatorTracing(JNIEnv*, jclass) {
   UNIMPLEMENTED(WARNING);
   // dvmEmulatorTraceStop();
 }

 static jboolean VMDebug_isDebuggerConnected(JNIEnv*, jclass) {
   return Dbg::IsDebuggerActive();
 }

 static jboolean VMDebug_isDebuggingEnabled(JNIEnv*, jclass) {
   return Dbg::IsJdwpConfigured();
 }

 static jlong VMDebug_lastDebuggerActivity(JNIEnv*, jclass) {
   return Dbg::LastDebuggerActivity();
 }

 static void ThrowUnsupportedOperationException(JNIEnv* env) {
   ScopedObjectAccess soa(env);
   soa.Self()->ThrowNewException("Ljava/lang/UnsupportedOperationException;", nullptr);
 }

 static void VMDebug_startInstructionCounting(JNIEnv* env, jclass) {
   ThrowUnsupportedOperationException(env);
 }

 static void VMDebug_stopInstructionCounting(JNIEnv* env, jclass) {
   ThrowUnsupportedOperationException(env);
 }

 static void VMDebug_getInstructionCount(JNIEnv* env, jclass, jintArray /*javaCounts*/) {
   ThrowUnsupportedOperationException(env);
 }

 static void VMDebug_resetInstructionCount(JNIEnv* env, jclass) {
   ThrowUnsupportedOperationException(env);
 }

 static void VMDebug_printLoadedClasses(JNIEnv* env, jclass, jint flags) {
   ScopedFastNativeObjectAccess soa(env);
   return Runtime::Current()->GetClassLinker()->DumpAllClasses(flags);
 }

 static jint VMDebug_getLoadedClassCount(JNIEnv* env, jclass) {
   ScopedFastNativeObjectAccess soa(env);
   return Runtime::Current()->GetClassLinker()->NumLoadedClasses();
 }

 /*
  * Returns the thread-specific CPU-time clock value for the current thread,
  * or -1 if the feature isn't supported.
  */
 static jlong VMDebug_threadCpuTimeNanos(JNIEnv*, jclass) {
   return ThreadCpuNanoTime();
 }

 /*
  * static void dumpHprofData(String fileName, FileDescriptor fd)
  *
  * Cause "hprof" data to be dumped.  We can throw an IOException if an
  * error occurs during file handling.
  */
 static void VMDebug_dumpHprofData(JNIEnv* env, jclass, jstring javaFilename, jobject javaFd) {
   // Only one of these may be null.
   if (javaFilename == nullptr && javaFd == nullptr) {
     ScopedObjectAccess soa(env);
     ThrowNullPointerException("fileName == null && fd == null");
     return;
   }

   std::string filename;
   if (javaFilename != nullptr) {
     ScopedUtfChars chars(env, javaFilename);
     if (env->ExceptionCheck()) {
       return;
     }
     filename = chars.c_str();
   } else {
     filename = "[fd]";
   }

   int fd = -1;
   if (javaFd != nullptr) {
     fd = jniGetFDFromFileDescriptor(env, javaFd);
     if (fd < 0) {
       ScopedObjectAccess soa(env);
       ThrowRuntimeException("Invalid file descriptor");
       return;
     }
   }

   hprof::DumpHeap(filename.c_str(), fd, false);
 }

 static void VMDebug_dumpHprofDataDdms(JNIEnv*, jclass) {
   hprof::DumpHeap("[DDMS]", -1, true);
 }

 static void VMDebug_dumpReferenceTables(JNIEnv* env, jclass) {
   ScopedObjectAccess soa(env);
   LOG(INFO) << "--- reference table dump ---";

   soa.Env()->DumpReferenceTables(LOG_STREAM(INFO));
   soa.Vm()->DumpReferenceTables(LOG_STREAM(INFO));

   LOG(INFO) << "---";
 }

 static void VMDebug_crash(JNIEnv*, jclass) {
   LOG(FATAL) << "Crashing runtime on request";
 }

 static void VMDebug_infopoint(JNIEnv*, jclass, jint id) {
   LOG(INFO) << "VMDebug infopoint " << id << " hit";
 }

 static jlong VMDebug_countInstancesOfClass(JNIEnv* env,
                                            jclass,
                                            jclass javaClass,
                                            jboolean countAssignable) {
   ScopedObjectAccess soa(env);
   gc::Heap* const heap = Runtime::Current()->GetHeap();
   // Caller's responsibility to do GC if desired.
   ObjPtr<mirror::Class> c = soa.Decode<mirror::Class>(javaClass);
   if (c == nullptr) {
     return 0;
   }
   VariableSizedHandleScope hs(soa.Self());
   std::vector<Handle<mirror::Class>> classes {hs.NewHandle(c)};
   uint64_t count = 0;
   heap->CountInstances(classes, countAssignable, &count);
   return count;
 }

 static jlongArray VMDebug_countInstancesOfClasses(JNIEnv* env,
                                                   jclass,
                                                   jobjectArray javaClasses,
                                                   jboolean countAssignable) {
   ScopedObjectAccess soa(env);
   gc::Heap* const heap = Runtime::Current()->GetHeap();
   // Caller's responsibility to do GC if desired.
   ObjPtr<mirror::ObjectArray<mirror::Class>> decoded_classes =
       soa.Decode<mirror::ObjectArray<mirror::Class>>(javaClasses);
   if (decoded_classes == nullptr) {
     return nullptr;
   }
   VariableSizedHandleScope hs(soa.Self());
   std::vector<Handle<mirror::Class>> classes;
   for (size_t i = 0, count = decoded_classes->GetLength(); i < count; ++i) {
     classes.push_back(hs.NewHandle(decoded_classes->Get(i)));
   }
   std::vector<uint64_t> counts(classes.size(), 0u);
   // Heap::CountInstances can handle null and will put 0 for these classes.
   heap->CountInstances(classes, countAssignable, &counts[0]);
   ObjPtr<mirror::LongArray> long_counts = mirror::LongArray::Alloc(soa.Self(), counts.size());
   if (long_counts == nullptr) {
     soa.Self()->AssertPendingOOMException();
     return nullptr;
   }
   for (size_t i = 0; i < counts.size(); ++i) {
     long_counts->Set(i, counts[i]);
   }
   return soa.AddLocalReference<jlongArray>(long_counts);
 }

 // We export the VM internal per-heap-space size/alloc/free metrics
 // for the zygote space, alloc space (application heap), and the large
 // object space for dumpsys meminfo. The other memory region data such
 // as PSS, private/shared dirty/shared data are available via
 // /proc/<pid>/smaps.
 static void VMDebug_getHeapSpaceStats(JNIEnv* env, jclass, jlongArray data) {
   jlong* arr = reinterpret_cast<jlong*>(env->GetPrimitiveArrayCritical(data, 0));
   if (arr == nullptr || env->GetArrayLength(data) < 9) {
     return;
   }

   size_t allocSize = 0;
   size_t allocUsed = 0;
   size_t zygoteSize = 0;
   size_t zygoteUsed = 0;
   size_t largeObjectsSize = 0;
   size_t largeObjectsUsed = 0;
   gc::Heap* heap = Runtime::Current()->GetHeap();
   {
     ScopedObjectAccess soa(env);
     for (gc::space::ContinuousSpace* space : heap->GetContinuousSpaces()) {
       if (space->IsImageSpace()) {
         // Currently don't include the image space.
       } else if (space->IsZygoteSpace()) {
         gc::space::ZygoteSpace* zygote_space = space->AsZygoteSpace();
         zygoteSize += zygote_space->Size();
         zygoteUsed += zygote_space->GetBytesAllocated();
       } else if (space->IsMallocSpace()) {
         // This is a malloc space.
         gc::space::MallocSpace* malloc_space = space->AsMallocSpace();
         allocSize += malloc_space->GetFootprint();
         allocUsed += malloc_space->GetBytesAllocated();
       } else if (space->IsBumpPointerSpace()) {
         gc::space::BumpPointerSpace* bump_pointer_space = space->AsBumpPointerSpace();
         allocSize += bump_pointer_space->Size();
         allocUsed += bump_pointer_space->GetBytesAllocated();
       }
     }
     for (gc::space::DiscontinuousSpace* space : heap->GetDiscontinuousSpaces()) {
       if (space->IsLargeObjectSpace()) {
         largeObjectsSize += space->AsLargeObjectSpace()->GetBytesAllocated();
         largeObjectsUsed += largeObjectsSize;
       }
     }
   }
   size_t allocFree = allocSize - allocUsed;
   size_t zygoteFree = zygoteSize - zygoteUsed;
   size_t largeObjectsFree = largeObjectsSize - largeObjectsUsed;

   int j = 0;
   arr[j++] = allocSize;
   arr[j++] = allocUsed;
   arr[j++] = allocFree;
   arr[j++] = zygoteSize;
   arr[j++] = zygoteUsed;
   arr[j++] = zygoteFree;
   arr[j++] = largeObjectsSize;
   arr[j++] = largeObjectsUsed;
   arr[j++] = largeObjectsFree;
   env->ReleasePrimitiveArrayCritical(data, arr, 0);
 }

 // The runtime stat names for VMDebug.getRuntimeStat().
 enum class VMDebugRuntimeStatId {
   kArtGcGcCount = 0,
   kArtGcGcTime,
   kArtGcBytesAllocated,
   kArtGcBytesFreed,
   kArtGcBlockingGcCount,
   kArtGcBlockingGcTime,
   kArtGcGcCountRateHistogram,
   kArtGcBlockingGcCountRateHistogram,
   kNumRuntimeStats,
 };

 static jobject VMDebug_getRuntimeStatInternal(JNIEnv* env, jclass, jint statId) {
   gc::Heap* heap = Runtime::Current()->GetHeap();
   switch (static_cast<VMDebugRuntimeStatId>(statId)) {
     case VMDebugRuntimeStatId::kArtGcGcCount: {
       std::string output = std::to_string(heap->GetGcCount());
       return env->NewStringUTF(output.c_str());
     }
     case VMDebugRuntimeStatId::kArtGcGcTime: {
       std::string output = std::to_string(NsToMs(heap->GetGcTime()));
       return env->NewStringUTF(output.c_str());
     }
     case VMDebugRuntimeStatId::kArtGcBytesAllocated: {
       std::string output = std::to_string(heap->GetBytesAllocatedEver());
       return env->NewStringUTF(output.c_str());
     }
     case VMDebugRuntimeStatId::kArtGcBytesFreed: {
       std::string output = std::to_string(heap->GetBytesFreedEver());
       return env->NewStringUTF(output.c_str());
     }
     case VMDebugRuntimeStatId::kArtGcBlockingGcCount: {
       std::string output = std::to_string(heap->GetBlockingGcCount());
       return env->NewStringUTF(output.c_str());
     }
     case VMDebugRuntimeStatId::kArtGcBlockingGcTime: {
       std::string output = std::to_string(NsToMs(heap->GetBlockingGcTime()));
       return env->NewStringUTF(output.c_str());
     }
     case VMDebugRuntimeStatId::kArtGcGcCountRateHistogram: {
       std::ostringstream output;
       heap->DumpGcCountRateHistogram(output);
       return env->NewStringUTF(output.str().c_str());
     }
     case VMDebugRuntimeStatId::kArtGcBlockingGcCountRateHistogram: {
       std::ostringstream output;
       heap->DumpBlockingGcCountRateHistogram(output);
       return env->NewStringUTF(output.str().c_str());
     }
     default:
       return nullptr;
   }
 }

 static bool SetRuntimeStatValue(JNIEnv* env,
                                 jobjectArray result,
                                 VMDebugRuntimeStatId id,
                                 const std::string& value) {
   ScopedLocalRef<jstring> jvalue(env, env->NewStringUTF(value.c_str()));
   if (jvalue.get() == nullptr) {
     return false;
   }
   env->SetObjectArrayElement(result, static_cast<jint>(id), jvalue.get());
   return true;
 }

 static jobjectArray VMDebug_getRuntimeStatsInternal(JNIEnv* env, jclass) {
   jobjectArray result = env->NewObjectArray(
       static_cast<jint>(VMDebugRuntimeStatId::kNumRuntimeStats),
       WellKnownClasses::java_lang_String,
       nullptr);
   if (result == nullptr) {
     return nullptr;
   }
   gc::Heap* heap = Runtime::Current()->GetHeap();
   if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcGcCount,
                            std::to_string(heap->GetGcCount()))) {
     return nullptr;
   }
   if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcGcTime,
                            std::to_string(NsToMs(heap->GetGcTime())))) {
     return nullptr;
   }
   if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcBytesAllocated,
                            std::to_string(heap->GetBytesAllocatedEver()))) {
     return nullptr;
   }
   if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcBytesFreed,
                            std::to_string(heap->GetBytesFreedEver()))) {
     return nullptr;
   }
   if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcBlockingGcCount,
                            std::to_string(heap->GetBlockingGcCount()))) {
     return nullptr;
   }
   if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcBlockingGcTime,
                            std::to_string(NsToMs(heap->GetBlockingGcTime())))) {
     return nullptr;
   }
   {
     std::ostringstream output;
     heap->DumpGcCountRateHistogram(output);
     if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcGcCountRateHistogram,
                              output.str())) {
       return nullptr;
     }
   }
   {
     std::ostringstream output;
     heap->DumpBlockingGcCountRateHistogram(output);
     if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcBlockingGcCountRateHistogram,
                              output.str())) {
       return nullptr;
     }
   }
   return result;
 }

 static void VMDebug_attachAgent(JNIEnv* env, jclass, jstring agent) {
   if (agent == nullptr) {
     ScopedObjectAccess soa(env);
     ThrowNullPointerException("agent is null");
     return;
   }

   if (!Dbg::IsJdwpAllowed()) {
     ScopedObjectAccess soa(env);
     ThrowSecurityException("Can't attach agent, process is not debuggable.");
     return;
   }

   std::string filename;
   {
     ScopedUtfChars chars(env, agent);
     if (env->ExceptionCheck()) {
       return;
     }
     filename = chars.c_str();
   }

   Runtime::Current()->AttachAgent(filename);
 }

 static JNINativeMethod gMethods[] = {
   NATIVE_METHOD(VMDebug, countInstancesOfClass, "(Ljava/lang/Class;Z)J"),
   NATIVE_METHOD(VMDebug, countInstancesOfClasses, "([Ljava/lang/Class;Z)[J"),
   NATIVE_METHOD(VMDebug, crash, "()V"),
   NATIVE_METHOD(VMDebug, dumpHprofData, "(Ljava/lang/String;Ljava/io/FileDescriptor;)V"),
   NATIVE_METHOD(VMDebug, dumpHprofDataDdms, "()V"),
   NATIVE_METHOD(VMDebug, dumpReferenceTables, "()V"),
   NATIVE_METHOD(VMDebug, getAllocCount, "(I)I"),
   NATIVE_METHOD(VMDebug, getHeapSpaceStats, "([J)V"),
   NATIVE_METHOD(VMDebug, getInstructionCount, "([I)V"),
   NATIVE_METHOD(VMDebug, getLoadedClassCount, "!()I"),
   NATIVE_METHOD(VMDebug, getVmFeatureList, "()[Ljava/lang/String;"),
   NATIVE_METHOD(VMDebug, infopoint, "(I)V"),
   NATIVE_METHOD(VMDebug, isDebuggerConnected, "!()Z"),
   NATIVE_METHOD(VMDebug, isDebuggingEnabled, "!()Z"),
   NATIVE_METHOD(VMDebug, getMethodTracingMode, "()I"),
   NATIVE_METHOD(VMDebug, lastDebuggerActivity, "!()J"),
   NATIVE_METHOD(VMDebug, printLoadedClasses, "!(I)V"),
   NATIVE_METHOD(VMDebug, resetAllocCount, "(I)V"),
   NATIVE_METHOD(VMDebug, resetInstructionCount, "()V"),
   NATIVE_METHOD(VMDebug, startAllocCounting, "()V"),
   NATIVE_METHOD(VMDebug, startEmulatorTracing, "()V"),
   NATIVE_METHOD(VMDebug, startInstructionCounting, "()V"),
   NATIVE_METHOD(VMDebug, startMethodTracingDdmsImpl, "(IIZI)V"),
   NATIVE_METHOD(VMDebug, startMethodTracingFd, "(Ljava/lang/String;Ljava/io/FileDescriptor;IIZI)V"),
   NATIVE_METHOD(VMDebug, startMethodTracingFilename, "(Ljava/lang/String;IIZI)V"),
   NATIVE_METHOD(VMDebug, stopAllocCounting, "()V"),
   NATIVE_METHOD(VMDebug, stopEmulatorTracing, "()V"),
   NATIVE_METHOD(VMDebug, stopInstructionCounting, "()V"),
   NATIVE_METHOD(VMDebug, stopMethodTracing, "()V"),
   NATIVE_METHOD(VMDebug, threadCpuTimeNanos, "!()J"),
   NATIVE_METHOD(VMDebug, getRuntimeStatInternal, "(I)Ljava/lang/String;"),
   NATIVE_METHOD(VMDebug, getRuntimeStatsInternal, "()[Ljava/lang/String;"),
   NATIVE_METHOD(VMDebug, attachAgent, "(Ljava/lang/String;)V"),
 };

 void register_dalvik_system_VMDebug(JNIEnv* env) {
   REGISTER_NATIVE_METHODS("dalvik/system/VMDebug");
 }

 }  // namespace art
	/*
	* Copyright (C) 2008 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "dalvik_system_VMDebug.h"

	#include <string.h>
	#include <unistd.h>

	#include <sstream>

	#include "base/histogram-inl.h"
	#include "base/time_utils.h"
	#include "class_linker.h"
	#include "common_throws.h"
	#include "debugger.h"
	#include "gc/space/bump_pointer_space.h"
	#include "gc/space/dlmalloc_space.h"
	#include "gc/space/large_object_space.h"
	#include "gc/space/space-inl.h"
	#include "gc/space/zygote_space.h"
	#include "hprof/hprof.h"
	#include "jni_internal.h"
	#include "mirror/class.h"
	#include "ScopedLocalRef.h"
	#include "ScopedUtfChars.h"
	#include "scoped_fast_native_object_access-inl.h"
	#include "trace.h"
	#include "well_known_classes.h"

	namespace art {

	static jobjectArray VMDebug_getVmFeatureList(JNIEnv* env, jclass) {
	static const char* features[] = {
	"method-trace-profiling",
	"method-trace-profiling-streaming",
	"method-sample-profiling",
	"hprof-heap-dump",
	"hprof-heap-dump-streaming",
	};
	jobjectArray result = env->NewObjectArray(arraysize(features),
	WellKnownClasses::java_lang_String,
	nullptr);
	if (result != nullptr) {
	for (size_t i = 0; i < arraysize(features); ++i) {
	ScopedLocalRef<jstring> jfeature(env, env->NewStringUTF(features[i]));
	if (jfeature.get() == nullptr) {
	return nullptr;
	}
	env->SetObjectArrayElement(result, i, jfeature.get());
	}
	}
	return result;
	}

	static void VMDebug_startAllocCounting(JNIEnv*, jclass) {
	Runtime::Current()->SetStatsEnabled(true);
	}

	static void VMDebug_stopAllocCounting(JNIEnv*, jclass) {
	Runtime::Current()->SetStatsEnabled(false);
	}

	static jint VMDebug_getAllocCount(JNIEnv*, jclass, jint kind) {
	return Runtime::Current()->GetStat(kind);
	}

	static void VMDebug_resetAllocCount(JNIEnv*, jclass, jint kinds) {
	Runtime::Current()->ResetStats(kinds);
	}

	static void VMDebug_startMethodTracingDdmsImpl(JNIEnv*, jclass, jint bufferSize, jint flags,
	jboolean samplingEnabled, jint intervalUs) {
	Trace::Start("[DDMS]", -1, bufferSize, flags, Trace::TraceOutputMode::kDDMS,
	samplingEnabled ? Trace::TraceMode::kSampling : Trace::TraceMode::kMethodTracing,
	intervalUs);
	}

	static void VMDebug_startMethodTracingFd(JNIEnv* env, jclass, jstring javaTraceFilename,
	jobject javaFd, jint bufferSize, jint flags,
	jboolean samplingEnabled, jint intervalUs) {
	int originalFd = jniGetFDFromFileDescriptor(env, javaFd);
	if (originalFd < 0) {
	return;
	}

	int fd = dup(originalFd);
	if (fd < 0) {
	ScopedObjectAccess soa(env);
	soa.Self()->ThrowNewExceptionF("Ljava/lang/RuntimeException;",
	"dup(%d) failed: %s", originalFd, strerror(errno));
	return;
	}

	ScopedUtfChars traceFilename(env, javaTraceFilename);
	if (traceFilename.c_str() == nullptr) {
	return;
	}
	Trace::Start(traceFilename.c_str(), fd, bufferSize, flags, Trace::TraceOutputMode::kFile,
	samplingEnabled ? Trace::TraceMode::kSampling : Trace::TraceMode::kMethodTracing,
	intervalUs);
	}

	static void VMDebug_startMethodTracingFilename(JNIEnv* env, jclass, jstring javaTraceFilename,
	jint bufferSize, jint flags,
	jboolean samplingEnabled, jint intervalUs) {
	ScopedUtfChars traceFilename(env, javaTraceFilename);
	if (traceFilename.c_str() == nullptr) {
	return;
	}
	Trace::Start(traceFilename.c_str(), -1, bufferSize, flags, Trace::TraceOutputMode::kFile,
	samplingEnabled ? Trace::TraceMode::kSampling : Trace::TraceMode::kMethodTracing,
	intervalUs);
	}

	static jint VMDebug_getMethodTracingMode(JNIEnv*, jclass) {
	return Trace::GetMethodTracingMode();
	}

	static void VMDebug_stopMethodTracing(JNIEnv*, jclass) {
	Trace::Stop();
	}

	static void VMDebug_startEmulatorTracing(JNIEnv*, jclass) {
	UNIMPLEMENTED(WARNING);
	// dvmEmulatorTraceStart();
	}

	static void VMDebug_stopEmulatorTracing(JNIEnv*, jclass) {
	UNIMPLEMENTED(WARNING);
	// dvmEmulatorTraceStop();
	}

	static jboolean VMDebug_isDebuggerConnected(JNIEnv*, jclass) {
	return Dbg::IsDebuggerActive();
	}

	static jboolean VMDebug_isDebuggingEnabled(JNIEnv*, jclass) {
	return Dbg::IsJdwpConfigured();
	}

	static jlong VMDebug_lastDebuggerActivity(JNIEnv*, jclass) {
	return Dbg::LastDebuggerActivity();
	}

	static void ThrowUnsupportedOperationException(JNIEnv* env) {
	ScopedObjectAccess soa(env);
	soa.Self()->ThrowNewException("Ljava/lang/UnsupportedOperationException;", nullptr);
	}

	static void VMDebug_startInstructionCounting(JNIEnv* env, jclass) {
	ThrowUnsupportedOperationException(env);
	}

	static void VMDebug_stopInstructionCounting(JNIEnv* env, jclass) {
	ThrowUnsupportedOperationException(env);
	}

	static void VMDebug_getInstructionCount(JNIEnv* env, jclass, jintArray /javaCounts/) {
	ThrowUnsupportedOperationException(env);
	}

	static void VMDebug_resetInstructionCount(JNIEnv* env, jclass) {
	ThrowUnsupportedOperationException(env);
	}

	static void VMDebug_printLoadedClasses(JNIEnv* env, jclass, jint flags) {
	ScopedFastNativeObjectAccess soa(env);
	return Runtime::Current()->GetClassLinker()->DumpAllClasses(flags);
	}

	static jint VMDebug_getLoadedClassCount(JNIEnv* env, jclass) {
	ScopedFastNativeObjectAccess soa(env);
	return Runtime::Current()->GetClassLinker()->NumLoadedClasses();
	}

	/*
	* Returns the thread-specific CPU-time clock value for the current thread,
	* or -1 if the feature isn't supported.
	*/
	static jlong VMDebug_threadCpuTimeNanos(JNIEnv*, jclass) {
	return ThreadCpuNanoTime();
	}

	/*
	* static void dumpHprofData(String fileName, FileDescriptor fd)
	*
	* Cause "hprof" data to be dumped. We can throw an IOException if an
	* error occurs during file handling.
	*/
	static void VMDebug_dumpHprofData(JNIEnv* env, jclass, jstring javaFilename, jobject javaFd) {
	// Only one of these may be null.
	if (javaFilename == nullptr && javaFd == nullptr) {
	ScopedObjectAccess soa(env);
	ThrowNullPointerException("fileName == null && fd == null");
	return;
	}

	std::string filename;
	if (javaFilename != nullptr) {
	ScopedUtfChars chars(env, javaFilename);
	if (env->ExceptionCheck()) {
	return;
	}
	filename = chars.c_str();
	} else {
	filename = "[fd]";
	}

	int fd = -1;
	if (javaFd != nullptr) {
	fd = jniGetFDFromFileDescriptor(env, javaFd);
	if (fd < 0) {
	ScopedObjectAccess soa(env);
	ThrowRuntimeException("Invalid file descriptor");
	return;
	}
	}

	hprof::DumpHeap(filename.c_str(), fd, false);
	}

	static void VMDebug_dumpHprofDataDdms(JNIEnv*, jclass) {
	hprof::DumpHeap("[DDMS]", -1, true);
	}

	static void VMDebug_dumpReferenceTables(JNIEnv* env, jclass) {
	ScopedObjectAccess soa(env);
	LOG(INFO) << "--- reference table dump ---";

	soa.Env()->DumpReferenceTables(LOG_STREAM(INFO));
	soa.Vm()->DumpReferenceTables(LOG_STREAM(INFO));

	LOG(INFO) << "---";
	}

	static void VMDebug_crash(JNIEnv*, jclass) {
	LOG(FATAL) << "Crashing runtime on request";
	}

	static void VMDebug_infopoint(JNIEnv*, jclass, jint id) {
	LOG(INFO) << "VMDebug infopoint " << id << " hit";
	}

	static jlong VMDebug_countInstancesOfClass(JNIEnv* env,
	jclass,
	jclass javaClass,
	jboolean countAssignable) {
	ScopedObjectAccess soa(env);
	gc::Heap* const heap = Runtime::Current()->GetHeap();
	// Caller's responsibility to do GC if desired.
	ObjPtr<mirror::Class> c = soa.Decode<mirror::Class>(javaClass);
	if (c == nullptr) {
	return 0;
	}
	VariableSizedHandleScope hs(soa.Self());
	std::vector<Handle<mirror::Class>> classes {hs.NewHandle(c)};
	uint64_t count = 0;
	heap->CountInstances(classes, countAssignable, &count);
	return count;
	}

	static jlongArray VMDebug_countInstancesOfClasses(JNIEnv* env,
	jclass,
	jobjectArray javaClasses,
	jboolean countAssignable) {
	ScopedObjectAccess soa(env);
	gc::Heap* const heap = Runtime::Current()->GetHeap();
	// Caller's responsibility to do GC if desired.
	ObjPtr<mirror::ObjectArray<mirror::Class>> decoded_classes =
	soa.Decode<mirror::ObjectArray<mirror::Class>>(javaClasses);
	if (decoded_classes == nullptr) {
	return nullptr;
	}
	VariableSizedHandleScope hs(soa.Self());
	std::vector<Handle<mirror::Class>> classes;
	for (size_t i = 0, count = decoded_classes->GetLength(); i < count; ++i) {
	classes.push_back(hs.NewHandle(decoded_classes->Get(i)));
	}
	std::vector<uint64_t> counts(classes.size(), 0u);
	// Heap::CountInstances can handle null and will put 0 for these classes.
	heap->CountInstances(classes, countAssignable, &counts[0]);
	ObjPtr<mirror::LongArray> long_counts = mirror::LongArray::Alloc(soa.Self(), counts.size());
	if (long_counts == nullptr) {
	soa.Self()->AssertPendingOOMException();
	return nullptr;
	}
	for (size_t i = 0; i < counts.size(); ++i) {
	long_counts->Set(i, counts[i]);
	}
	return soa.AddLocalReference<jlongArray>(long_counts);
	}

	// We export the VM internal per-heap-space size/alloc/free metrics
	// for the zygote space, alloc space (application heap), and the large
	// object space for dumpsys meminfo. The other memory region data such
	// as PSS, private/shared dirty/shared data are available via
	// /proc/<pid>/smaps.
	static void VMDebug_getHeapSpaceStats(JNIEnv* env, jclass, jlongArray data) {
	jlong* arr = reinterpret_cast<jlong*>(env->GetPrimitiveArrayCritical(data, 0));
	if (arr == nullptr \|\| env->GetArrayLength(data) < 9) {
	return;
	}

	size_t allocSize = 0;
	size_t allocUsed = 0;
	size_t zygoteSize = 0;
	size_t zygoteUsed = 0;
	size_t largeObjectsSize = 0;
	size_t largeObjectsUsed = 0;
	gc::Heap* heap = Runtime::Current()->GetHeap();
	{
	ScopedObjectAccess soa(env);
	for (gc::space::ContinuousSpace* space : heap->GetContinuousSpaces()) {
	if (space->IsImageSpace()) {
	// Currently don't include the image space.
	} else if (space->IsZygoteSpace()) {
	gc::space::ZygoteSpace* zygote_space = space->AsZygoteSpace();
	zygoteSize += zygote_space->Size();
	zygoteUsed += zygote_space->GetBytesAllocated();
	} else if (space->IsMallocSpace()) {
	// This is a malloc space.
	gc::space::MallocSpace* malloc_space = space->AsMallocSpace();
	allocSize += malloc_space->GetFootprint();
	allocUsed += malloc_space->GetBytesAllocated();
	} else if (space->IsBumpPointerSpace()) {
	gc::space::BumpPointerSpace* bump_pointer_space = space->AsBumpPointerSpace();
	allocSize += bump_pointer_space->Size();
	allocUsed += bump_pointer_space->GetBytesAllocated();
	}
	}
	for (gc::space::DiscontinuousSpace* space : heap->GetDiscontinuousSpaces()) {
	if (space->IsLargeObjectSpace()) {
	largeObjectsSize += space->AsLargeObjectSpace()->GetBytesAllocated();
	largeObjectsUsed += largeObjectsSize;
	}
	}
	}
	size_t allocFree = allocSize - allocUsed;
	size_t zygoteFree = zygoteSize - zygoteUsed;
	size_t largeObjectsFree = largeObjectsSize - largeObjectsUsed;

	int j = 0;
	arr[j++] = allocSize;
	arr[j++] = allocUsed;
	arr[j++] = allocFree;
	arr[j++] = zygoteSize;
	arr[j++] = zygoteUsed;
	arr[j++] = zygoteFree;
	arr[j++] = largeObjectsSize;
	arr[j++] = largeObjectsUsed;
	arr[j++] = largeObjectsFree;
	env->ReleasePrimitiveArrayCritical(data, arr, 0);
	}

	// The runtime stat names for VMDebug.getRuntimeStat().
	enum class VMDebugRuntimeStatId {
	kArtGcGcCount = 0,
	kArtGcGcTime,
	kArtGcBytesAllocated,
	kArtGcBytesFreed,
	kArtGcBlockingGcCount,
	kArtGcBlockingGcTime,
	kArtGcGcCountRateHistogram,
	kArtGcBlockingGcCountRateHistogram,
	kNumRuntimeStats,
	};

	static jobject VMDebug_getRuntimeStatInternal(JNIEnv* env, jclass, jint statId) {
	gc::Heap* heap = Runtime::Current()->GetHeap();
	switch (static_cast<VMDebugRuntimeStatId>(statId)) {
	case VMDebugRuntimeStatId::kArtGcGcCount: {
	std::string output = std::to_string(heap->GetGcCount());
	return env->NewStringUTF(output.c_str());
	}
	case VMDebugRuntimeStatId::kArtGcGcTime: {
	std::string output = std::to_string(NsToMs(heap->GetGcTime()));
	return env->NewStringUTF(output.c_str());
	}
	case VMDebugRuntimeStatId::kArtGcBytesAllocated: {
	std::string output = std::to_string(heap->GetBytesAllocatedEver());
	return env->NewStringUTF(output.c_str());
	}
	case VMDebugRuntimeStatId::kArtGcBytesFreed: {
	std::string output = std::to_string(heap->GetBytesFreedEver());
	return env->NewStringUTF(output.c_str());
	}
	case VMDebugRuntimeStatId::kArtGcBlockingGcCount: {
	std::string output = std::to_string(heap->GetBlockingGcCount());
	return env->NewStringUTF(output.c_str());
	}
	case VMDebugRuntimeStatId::kArtGcBlockingGcTime: {
	std::string output = std::to_string(NsToMs(heap->GetBlockingGcTime()));
	return env->NewStringUTF(output.c_str());
	}
	case VMDebugRuntimeStatId::kArtGcGcCountRateHistogram: {
	std::ostringstream output;
	heap->DumpGcCountRateHistogram(output);
	return env->NewStringUTF(output.str().c_str());
	}
	case VMDebugRuntimeStatId::kArtGcBlockingGcCountRateHistogram: {
	std::ostringstream output;
	heap->DumpBlockingGcCountRateHistogram(output);
	return env->NewStringUTF(output.str().c_str());
	}
	default:
	return nullptr;
	}
	}

	static bool SetRuntimeStatValue(JNIEnv* env,
	jobjectArray result,
	VMDebugRuntimeStatId id,
	const std::string& value) {
	ScopedLocalRef<jstring> jvalue(env, env->NewStringUTF(value.c_str()));
	if (jvalue.get() == nullptr) {
	return false;
	}
	env->SetObjectArrayElement(result, static_cast<jint>(id), jvalue.get());
	return true;
	}

	static jobjectArray VMDebug_getRuntimeStatsInternal(JNIEnv* env, jclass) {
	jobjectArray result = env->NewObjectArray(
	static_cast<jint>(VMDebugRuntimeStatId::kNumRuntimeStats),
	WellKnownClasses::java_lang_String,
	nullptr);
	if (result == nullptr) {
	return nullptr;
	}
	gc::Heap* heap = Runtime::Current()->GetHeap();
	if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcGcCount,
	std::to_string(heap->GetGcCount()))) {
	return nullptr;
	}
	if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcGcTime,
	std::to_string(NsToMs(heap->GetGcTime())))) {
	return nullptr;
	}
	if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcBytesAllocated,
	std::to_string(heap->GetBytesAllocatedEver()))) {
	return nullptr;
	}
	if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcBytesFreed,
	std::to_string(heap->GetBytesFreedEver()))) {
	return nullptr;
	}
	if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcBlockingGcCount,
	std::to_string(heap->GetBlockingGcCount()))) {
	return nullptr;
	}
	if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcBlockingGcTime,
	std::to_string(NsToMs(heap->GetBlockingGcTime())))) {
	return nullptr;
	}
	{
	std::ostringstream output;
	heap->DumpGcCountRateHistogram(output);
	if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcGcCountRateHistogram,
	output.str())) {
	return nullptr;
	}
	}
	{
	std::ostringstream output;
	heap->DumpBlockingGcCountRateHistogram(output);
	if (!SetRuntimeStatValue(env, result, VMDebugRuntimeStatId::kArtGcBlockingGcCountRateHistogram,
	output.str())) {
	return nullptr;
	}
	}
	return result;
	}

	static void VMDebug_attachAgent(JNIEnv* env, jclass, jstring agent) {
	if (agent == nullptr) {
	ScopedObjectAccess soa(env);
	ThrowNullPointerException("agent is null");
	return;
	}

	if (!Dbg::IsJdwpAllowed()) {
	ScopedObjectAccess soa(env);
	ThrowSecurityException("Can't attach agent, process is not debuggable.");
	return;
	}

	std::string filename;
	{
	ScopedUtfChars chars(env, agent);
	if (env->ExceptionCheck()) {
	return;
	}
	filename = chars.c_str();
	}

	Runtime::Current()->AttachAgent(filename);
	}

	static JNINativeMethod gMethods[] = {
	NATIVE_METHOD(VMDebug, countInstancesOfClass, "(Ljava/lang/Class;Z)J"),
	NATIVE_METHOD(VMDebug, countInstancesOfClasses, "([Ljava/lang/Class;Z)[J"),
	NATIVE_METHOD(VMDebug, crash, "()V"),
	NATIVE_METHOD(VMDebug, dumpHprofData, "(Ljava/lang/String;Ljava/io/FileDescriptor;)V"),
	NATIVE_METHOD(VMDebug, dumpHprofDataDdms, "()V"),
	NATIVE_METHOD(VMDebug, dumpReferenceTables, "()V"),
	NATIVE_METHOD(VMDebug, getAllocCount, "(I)I"),
	NATIVE_METHOD(VMDebug, getHeapSpaceStats, "([J)V"),
	NATIVE_METHOD(VMDebug, getInstructionCount, "([I)V"),
	NATIVE_METHOD(VMDebug, getLoadedClassCount, "!()I"),
	NATIVE_METHOD(VMDebug, getVmFeatureList, "()[Ljava/lang/String;"),
	NATIVE_METHOD(VMDebug, infopoint, "(I)V"),
	NATIVE_METHOD(VMDebug, isDebuggerConnected, "!()Z"),
	NATIVE_METHOD(VMDebug, isDebuggingEnabled, "!()Z"),
	NATIVE_METHOD(VMDebug, getMethodTracingMode, "()I"),
	NATIVE_METHOD(VMDebug, lastDebuggerActivity, "!()J"),
	NATIVE_METHOD(VMDebug, printLoadedClasses, "!(I)V"),
	NATIVE_METHOD(VMDebug, resetAllocCount, "(I)V"),
	NATIVE_METHOD(VMDebug, resetInstructionCount, "()V"),
	NATIVE_METHOD(VMDebug, startAllocCounting, "()V"),
	NATIVE_METHOD(VMDebug, startEmulatorTracing, "()V"),
	NATIVE_METHOD(VMDebug, startInstructionCounting, "()V"),
	NATIVE_METHOD(VMDebug, startMethodTracingDdmsImpl, "(IIZI)V"),
	NATIVE_METHOD(VMDebug, startMethodTracingFd, "(Ljava/lang/String;Ljava/io/FileDescriptor;IIZI)V"),
	NATIVE_METHOD(VMDebug, startMethodTracingFilename, "(Ljava/lang/String;IIZI)V"),
	NATIVE_METHOD(VMDebug, stopAllocCounting, "()V"),
	NATIVE_METHOD(VMDebug, stopEmulatorTracing, "()V"),
	NATIVE_METHOD(VMDebug, stopInstructionCounting, "()V"),
	NATIVE_METHOD(VMDebug, stopMethodTracing, "()V"),
	NATIVE_METHOD(VMDebug, threadCpuTimeNanos, "!()J"),
	NATIVE_METHOD(VMDebug, getRuntimeStatInternal, "(I)Ljava/lang/String;"),
	NATIVE_METHOD(VMDebug, getRuntimeStatsInternal, "()[Ljava/lang/String;"),
	NATIVE_METHOD(VMDebug, attachAgent, "(Ljava/lang/String;)V"),
	};

	void register_dalvik_system_VMDebug(JNIEnv* env) {
	REGISTER_NATIVE_METHODS("dalvik/system/VMDebug");
	}

	} // namespace art