runtime/native/dalvik_system_VMDebug.cc - LeafOS-Project/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 "nativehelper/jni_macros.h"

 #include "base/file_utils.h"
 #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 "handle_scope-inl.h"
 #include "hprof/hprof.h"
 #include "jni/java_vm_ext.h"
 #include "jni/jni_internal.h"
 #include "mirror/array-alloc-inl.h"
 #include "mirror/array-inl.h"
 #include "mirror/class.h"
 #include "mirror/object_array-inl.h"
 #include "native_util.h"
 #include "nativehelper/scoped_local_ref.h"
 #include "nativehelper/scoped_utf_chars.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 static_cast<jint>(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::StartDDMS(bufferSize,
                    flags,
                    samplingEnabled ? Trace::TraceMode::kSampling : Trace::TraceMode::kMethodTracing,
                    intervalUs);
 }

 static void VMDebug_startMethodTracingFd(JNIEnv* env,
                                          jclass,
                                          jstring javaTraceFilename ATTRIBUTE_UNUSED,
                                          jint javaFd,
                                          jint bufferSize,
                                          jint flags,
                                          jboolean samplingEnabled,
                                          jint intervalUs,
                                          jboolean streamingOutput) {
   int originalFd = javaFd;
   if (originalFd < 0) {
     ScopedObjectAccess soa(env);
     soa.Self()->ThrowNewExceptionF("Ljava/lang/RuntimeException;",
                                    "Trace fd is invalid: %d",
                                    originalFd);
     return;
   }

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

   // Ignore the traceFilename.
   Trace::TraceOutputMode outputMode = streamingOutput
                                           ? Trace::TraceOutputMode::kStreaming
                                           : Trace::TraceOutputMode::kFile;
   Trace::Start(fd,
                bufferSize,
                flags,
                outputMode,
                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(),
                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 jboolean VMDebug_isDebuggerConnected(JNIEnv*, jclass) {
   // This function will be replaced by the debugger when it's connected. See
   // external/oj-libjdwp/src/share/vmDebug.c for implementation when debugger is connected.
   return false;
 }

 static jboolean VMDebug_isDebuggingEnabled(JNIEnv* env, jclass) {
   ScopedObjectAccess soa(env);
   return Runtime::Current()->GetRuntimeCallbacks()->IsDebuggerConfigured();
 }

 static jlong VMDebug_lastDebuggerActivity(JNIEnv*, jclass) {
   // This function will be replaced by the debugger when it's connected. See
   // external/oj-libjdwp/src/share/vmDebug.c for implementation when debugger is connected.
   return -1;
 }

 static void VMDebug_printLoadedClasses(JNIEnv* env, jclass, jint flags) {
   class DumpClassVisitor : public ClassVisitor {
    public:
     explicit DumpClassVisitor(int dump_flags) : flags_(dump_flags) {}

     bool operator()(ObjPtr<mirror::Class> klass) override REQUIRES_SHARED(Locks::mutator_lock_) {
       klass->DumpClass(LOG_STREAM(ERROR), flags_);
       return true;
     }

    private:
     const int flags_;
   };
   DumpClassVisitor visitor(flags);

   ScopedFastNativeObjectAccess soa(env);
   return Runtime::Current()->GetClassLinker()->VisitClasses(&visitor);
 }

 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, jint javaFd) {
   // Only one of these may be null.
   if (javaFilename == nullptr && javaFd < 0) {
     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 = javaFd;

   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 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);
 }

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

 static jstring 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());
     }
     case VMDebugRuntimeStatId::kArtGcObjectsAllocated: {
       std::string output = std::to_string(heap->GetObjectsAllocated());
       return env->NewStringUTF(output.c_str());
     }
     case VMDebugRuntimeStatId::kArtGcTotalTimeWaitingForGc: {
       std::string output = std::to_string(heap->GetTotalTimeWaitingForGC());
       return env->NewStringUTF(output.c_str());
     }
     case VMDebugRuntimeStatId::kArtGcPreOomeGcCount: {
       std::string output = std::to_string(heap->GetPreOomeGcCount());
       return env->NewStringUTF(output.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_nativeAttachAgent(JNIEnv* env, jclass, jstring agent, jobject classloader) {
   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(env, filename, classloader);
 }

 static void VMDebug_allowHiddenApiReflectionFrom(JNIEnv* env, jclass, jclass j_caller) {
   Runtime* runtime = Runtime::Current();
   ScopedObjectAccess soa(env);

   if (!runtime->IsJavaDebuggable()) {
     ThrowSecurityException("Can't exempt class, process is not debuggable.");
     return;
   }

   StackHandleScope<1> hs(soa.Self());
   Handle<mirror::Class> h_caller(hs.NewHandle(soa.Decode<mirror::Class>(j_caller)));
   if (h_caller.IsNull()) {
     ThrowNullPointerException("argument is null");
     return;
   }

   h_caller->SetSkipHiddenApiChecks();
 }

 static void VMDebug_setAllocTrackerStackDepth(JNIEnv* env, jclass, jint stack_depth) {
   Runtime* runtime = Runtime::Current();
   if (stack_depth < 0 ||
       static_cast<size_t>(stack_depth) > gc::AllocRecordObjectMap::kMaxSupportedStackDepth) {
     ScopedObjectAccess soa(env);
     soa.Self()->ThrowNewExceptionF("Ljava/lang/RuntimeException;",
                                    "Stack depth is invalid: %d",
                                    stack_depth);
   } else {
     runtime->GetHeap()->SetAllocTrackerStackDepth(static_cast<size_t>(stack_depth));
   }
 }

 static JNINativeMethod gMethods[] = {
   NATIVE_METHOD(VMDebug, countInstancesOfClass, "(Ljava/lang/Class;Z)J"),
   NATIVE_METHOD(VMDebug, countInstancesOfClasses, "([Ljava/lang/Class;Z)[J"),
   NATIVE_METHOD(VMDebug, dumpHprofData, "(Ljava/lang/String;I)V"),
   NATIVE_METHOD(VMDebug, dumpHprofDataDdms, "()V"),
   NATIVE_METHOD(VMDebug, dumpReferenceTables, "()V"),
   NATIVE_METHOD(VMDebug, getAllocCount, "(I)I"),
   FAST_NATIVE_METHOD(VMDebug, getLoadedClassCount, "()I"),
   NATIVE_METHOD(VMDebug, getVmFeatureList, "()[Ljava/lang/String;"),
   FAST_NATIVE_METHOD(VMDebug, isDebuggerConnected, "()Z"),
   FAST_NATIVE_METHOD(VMDebug, isDebuggingEnabled, "()Z"),
   NATIVE_METHOD(VMDebug, getMethodTracingMode, "()I"),
   FAST_NATIVE_METHOD(VMDebug, lastDebuggerActivity, "()J"),
   FAST_NATIVE_METHOD(VMDebug, printLoadedClasses, "(I)V"),
   NATIVE_METHOD(VMDebug, resetAllocCount, "(I)V"),
   NATIVE_METHOD(VMDebug, startAllocCounting, "()V"),
   NATIVE_METHOD(VMDebug, startMethodTracingDdmsImpl, "(IIZI)V"),
   NATIVE_METHOD(VMDebug, startMethodTracingFd, "(Ljava/lang/String;IIIZIZ)V"),
   NATIVE_METHOD(VMDebug, startMethodTracingFilename, "(Ljava/lang/String;IIZI)V"),
   NATIVE_METHOD(VMDebug, stopAllocCounting, "()V"),
   NATIVE_METHOD(VMDebug, stopMethodTracing, "()V"),
   FAST_NATIVE_METHOD(VMDebug, threadCpuTimeNanos, "()J"),
   NATIVE_METHOD(VMDebug, getRuntimeStatInternal, "(I)Ljava/lang/String;"),
   NATIVE_METHOD(VMDebug, getRuntimeStatsInternal, "()[Ljava/lang/String;"),
   NATIVE_METHOD(VMDebug, nativeAttachAgent, "(Ljava/lang/String;Ljava/lang/ClassLoader;)V"),
   NATIVE_METHOD(VMDebug, allowHiddenApiReflectionFrom, "(Ljava/lang/Class;)V"),
   NATIVE_METHOD(VMDebug, setAllocTrackerStackDepth, "(I)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 "nativehelper/jni_macros.h"

	#include "base/file_utils.h"
	#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 "handle_scope-inl.h"
	#include "hprof/hprof.h"
	#include "jni/java_vm_ext.h"
	#include "jni/jni_internal.h"
	#include "mirror/array-alloc-inl.h"
	#include "mirror/array-inl.h"
	#include "mirror/class.h"
	#include "mirror/object_array-inl.h"
	#include "native_util.h"
	#include "nativehelper/scoped_local_ref.h"
	#include "nativehelper/scoped_utf_chars.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 static_cast<jint>(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::StartDDMS(bufferSize,
	flags,
	samplingEnabled ? Trace::TraceMode::kSampling : Trace::TraceMode::kMethodTracing,
	intervalUs);
	}

	static void VMDebug_startMethodTracingFd(JNIEnv* env,
	jclass,
	jstring javaTraceFilename ATTRIBUTE_UNUSED,
	jint javaFd,
	jint bufferSize,
	jint flags,
	jboolean samplingEnabled,
	jint intervalUs,
	jboolean streamingOutput) {
	int originalFd = javaFd;
	if (originalFd < 0) {
	ScopedObjectAccess soa(env);
	soa.Self()->ThrowNewExceptionF("Ljava/lang/RuntimeException;",
	"Trace fd is invalid: %d",
	originalFd);
	return;
	}

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

	// Ignore the traceFilename.
	Trace::TraceOutputMode outputMode = streamingOutput
	? Trace::TraceOutputMode::kStreaming
	: Trace::TraceOutputMode::kFile;
	Trace::Start(fd,
	bufferSize,
	flags,
	outputMode,
	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(),
	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 jboolean VMDebug_isDebuggerConnected(JNIEnv*, jclass) {
	// This function will be replaced by the debugger when it's connected. See
	// external/oj-libjdwp/src/share/vmDebug.c for implementation when debugger is connected.
	return false;
	}

	static jboolean VMDebug_isDebuggingEnabled(JNIEnv* env, jclass) {
	ScopedObjectAccess soa(env);
	return Runtime::Current()->GetRuntimeCallbacks()->IsDebuggerConfigured();
	}

	static jlong VMDebug_lastDebuggerActivity(JNIEnv*, jclass) {
	// This function will be replaced by the debugger when it's connected. See
	// external/oj-libjdwp/src/share/vmDebug.c for implementation when debugger is connected.
	return -1;
	}

	static void VMDebug_printLoadedClasses(JNIEnv* env, jclass, jint flags) {
	class DumpClassVisitor : public ClassVisitor {
	public:
	explicit DumpClassVisitor(int dump_flags) : flags_(dump_flags) {}

	bool operator()(ObjPtr<mirror::Class> klass) override REQUIRES_SHARED(Locks::mutator_lock_) {
	klass->DumpClass(LOG_STREAM(ERROR), flags_);
	return true;
	}

	private:
	const int flags_;
	};
	DumpClassVisitor visitor(flags);

	ScopedFastNativeObjectAccess soa(env);
	return Runtime::Current()->GetClassLinker()->VisitClasses(&visitor);
	}

	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, jint javaFd) {
	// Only one of these may be null.
	if (javaFilename == nullptr && javaFd < 0) {
	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 = javaFd;

	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 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);
	}

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

	static jstring 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());
	}
	case VMDebugRuntimeStatId::kArtGcObjectsAllocated: {
	std::string output = std::to_string(heap->GetObjectsAllocated());
	return env->NewStringUTF(output.c_str());
	}
	case VMDebugRuntimeStatId::kArtGcTotalTimeWaitingForGc: {
	std::string output = std::to_string(heap->GetTotalTimeWaitingForGC());
	return env->NewStringUTF(output.c_str());
	}
	case VMDebugRuntimeStatId::kArtGcPreOomeGcCount: {
	std::string output = std::to_string(heap->GetPreOomeGcCount());
	return env->NewStringUTF(output.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_nativeAttachAgent(JNIEnv* env, jclass, jstring agent, jobject classloader) {
	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(env, filename, classloader);
	}

	static void VMDebug_allowHiddenApiReflectionFrom(JNIEnv* env, jclass, jclass j_caller) {
	Runtime* runtime = Runtime::Current();
	ScopedObjectAccess soa(env);

	if (!runtime->IsJavaDebuggable()) {
	ThrowSecurityException("Can't exempt class, process is not debuggable.");
	return;
	}

	StackHandleScope<1> hs(soa.Self());
	Handle<mirror::Class> h_caller(hs.NewHandle(soa.Decode<mirror::Class>(j_caller)));
	if (h_caller.IsNull()) {
	ThrowNullPointerException("argument is null");
	return;
	}

	h_caller->SetSkipHiddenApiChecks();
	}

	static void VMDebug_setAllocTrackerStackDepth(JNIEnv* env, jclass, jint stack_depth) {
	Runtime* runtime = Runtime::Current();
	if (stack_depth < 0 \|\|
	static_cast<size_t>(stack_depth) > gc::AllocRecordObjectMap::kMaxSupportedStackDepth) {
	ScopedObjectAccess soa(env);
	soa.Self()->ThrowNewExceptionF("Ljava/lang/RuntimeException;",
	"Stack depth is invalid: %d",
	stack_depth);
	} else {
	runtime->GetHeap()->SetAllocTrackerStackDepth(static_cast<size_t>(stack_depth));
	}
	}

	static JNINativeMethod gMethods[] = {
	NATIVE_METHOD(VMDebug, countInstancesOfClass, "(Ljava/lang/Class;Z)J"),
	NATIVE_METHOD(VMDebug, countInstancesOfClasses, "([Ljava/lang/Class;Z)[J"),
	NATIVE_METHOD(VMDebug, dumpHprofData, "(Ljava/lang/String;I)V"),
	NATIVE_METHOD(VMDebug, dumpHprofDataDdms, "()V"),
	NATIVE_METHOD(VMDebug, dumpReferenceTables, "()V"),
	NATIVE_METHOD(VMDebug, getAllocCount, "(I)I"),
	FAST_NATIVE_METHOD(VMDebug, getLoadedClassCount, "()I"),
	NATIVE_METHOD(VMDebug, getVmFeatureList, "()[Ljava/lang/String;"),
	FAST_NATIVE_METHOD(VMDebug, isDebuggerConnected, "()Z"),
	FAST_NATIVE_METHOD(VMDebug, isDebuggingEnabled, "()Z"),
	NATIVE_METHOD(VMDebug, getMethodTracingMode, "()I"),
	FAST_NATIVE_METHOD(VMDebug, lastDebuggerActivity, "()J"),
	FAST_NATIVE_METHOD(VMDebug, printLoadedClasses, "(I)V"),
	NATIVE_METHOD(VMDebug, resetAllocCount, "(I)V"),
	NATIVE_METHOD(VMDebug, startAllocCounting, "()V"),
	NATIVE_METHOD(VMDebug, startMethodTracingDdmsImpl, "(IIZI)V"),
	NATIVE_METHOD(VMDebug, startMethodTracingFd, "(Ljava/lang/String;IIIZIZ)V"),
	NATIVE_METHOD(VMDebug, startMethodTracingFilename, "(Ljava/lang/String;IIZI)V"),
	NATIVE_METHOD(VMDebug, stopAllocCounting, "()V"),
	NATIVE_METHOD(VMDebug, stopMethodTracing, "()V"),
	FAST_NATIVE_METHOD(VMDebug, threadCpuTimeNanos, "()J"),
	NATIVE_METHOD(VMDebug, getRuntimeStatInternal, "(I)Ljava/lang/String;"),
	NATIVE_METHOD(VMDebug, getRuntimeStatsInternal, "()[Ljava/lang/String;"),
	NATIVE_METHOD(VMDebug, nativeAttachAgent, "(Ljava/lang/String;Ljava/lang/ClassLoader;)V"),
	NATIVE_METHOD(VMDebug, allowHiddenApiReflectionFrom, "(Ljava/lang/Class;)V"),
	NATIVE_METHOD(VMDebug, setAllocTrackerStackDepth, "(I)V"),
	};

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

	} // namespace art