openjdkjvmti/art_jvmti.h - LeafOS-Project/android_art - Gitiles

 /* Copyright (C) 2016 The Android Open Source Project
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This file implements interfaces from the file jvmti.h. This implementation
  * is licensed under the same terms as the file jvmti.h.  The
  * copyright and license information for the file jvmti.h follows.
  *
  * Copyright (c) 2003, 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.
  */

 #ifndef ART_OPENJDKJVMTI_ART_JVMTI_H_
 #define ART_OPENJDKJVMTI_ART_JVMTI_H_

 #include <memory>
 #include <type_traits>
 #include <unordered_map>
 #include <unordered_set>

 #include <jni.h>

 #include <android-base/logging.h>

 #include "deopt_manager.h"
 #include "base/casts.h"
 #include "base/macros.h"
 #include "base/strlcpy.h"
 #include "base/mutex.h"
 #include "events.h"
 #include "instrumentation.h"
 #include "jni/java_vm_ext.h"
 #include "jni/jni_env_ext.h"
 #include "jvmti.h"
 #include "runtime.h"
 #include "ti_breakpoint.h"

 namespace art {
 class ArtField;
 class ArtMethod;
 class ShadowFrame;
 }  // namespace art

 namespace openjdkjvmti {

 class ObjectTagTable;

 // A special version that we use to identify special tooling interface versions which mostly matches
 // the jvmti spec but everything is best effort. This is used to implement the userdebug
 // 'debug-anything' behavior.
 //
 // This is the value 0x70010200.
 static constexpr jint kArtTiVersion = JVMTI_VERSION_1_2 | 0x40000000;

 // Returns whether we are able to use all jvmti features.
 static inline bool IsFullJvmtiAvailable() {
   art::Runtime* runtime = art::Runtime::Current();
   return runtime->GetInstrumentation()->IsForcedInterpretOnly() ||
          runtime->IsJavaDebuggableAtInit();
 }

 // A structure that is a jvmtiEnv with additional information for the runtime.
 struct ArtJvmTiEnv : public jvmtiEnv {
   art::JavaVMExt* art_vm;
   void* local_data;

   // The ti_version we are compatible with. This is only for giving the correct value for GetVersion
   // when running on a userdebug/eng device.
   jint ti_version;

   jvmtiCapabilities capabilities;

   EventMasks event_masks;
   std::unique_ptr<ArtJvmtiEventCallbacks> event_callbacks;

   // Tagging is specific to the jvmtiEnv.
   std::unique_ptr<ObjectTagTable> object_tag_table;

   // Set of watched fields is unique to each jvmtiEnv.
   // TODO It might be good to follow the RI and only let one jvmtiEnv ever have the watch caps so
   // we can record this on the field directly. We could do this either using free access-flag bits
   // or by putting a list in the ClassExt of a field's DeclaringClass.
   // TODO Maybe just have an extension to let one put a watch on every field, that would probably be
   // good enough maybe since you probably want either a few or all/almost all of them.
   std::unordered_set<art::ArtField*> access_watched_fields GUARDED_BY(event_info_mutex_);
   std::unordered_set<art::ArtField*> modify_watched_fields GUARDED_BY(event_info_mutex_);

   // Set of breakpoints is unique to each jvmtiEnv.
   std::unordered_set<Breakpoint> breakpoints GUARDED_BY(event_info_mutex_);
   std::unordered_set<const art::ShadowFrame*> notify_frames GUARDED_BY(event_info_mutex_);

   // RW lock to protect access to all of the event data.
   art::ReaderWriterMutex event_info_mutex_ DEFAULT_MUTEX_ACQUIRED_AFTER;

   std::string last_error_ GUARDED_BY(last_error_mutex_);
   // Lock to touch the last-error-message.
   art::Mutex last_error_mutex_ BOTTOM_MUTEX_ACQUIRED_AFTER;

   ArtJvmTiEnv(art::JavaVMExt* runtime, EventHandler* event_handler, jint ti_version);

   static ArtJvmTiEnv* AsArtJvmTiEnv(jvmtiEnv* env) {
     return art::down_cast<ArtJvmTiEnv*>(env);
   }

   // Top level lock. Nothing can be held when we get this except for mutator lock for full
   // thread-suspension.
   static art::Mutex *gEnvMutex ACQUIRED_AFTER(art::Locks::mutator_lock_);
 };

 // Macro and constexpr to make error values less annoying to write.
 #define ERR(e) JVMTI_ERROR_ ## e
 static constexpr jvmtiError OK = JVMTI_ERROR_NONE;

 // Special error code for unimplemented functions in JVMTI
 static constexpr jvmtiError ERR(NOT_IMPLEMENTED) = JVMTI_ERROR_NOT_AVAILABLE;

 static inline JNIEnv* GetJniEnv(jvmtiEnv* env) {
   JNIEnv* ret_value = nullptr;
   jint res = reinterpret_cast<ArtJvmTiEnv*>(env)->art_vm->GetEnv(
       reinterpret_cast<void**>(&ret_value), JNI_VERSION_1_1);
   if (res != JNI_OK) {
     return nullptr;
   }
   return ret_value;
 }

 template <typename T>
 class JvmtiDeleter {
  public:
   JvmtiDeleter() : env_(nullptr) {}
   explicit JvmtiDeleter(jvmtiEnv* env) : env_(env) {}

   JvmtiDeleter(JvmtiDeleter&) = default;
   JvmtiDeleter(JvmtiDeleter&&) noexcept = default;
   JvmtiDeleter& operator=(const JvmtiDeleter&) = default;

   void operator()(T* ptr) const {
     CHECK(env_ != nullptr);
     jvmtiError ret = env_->Deallocate(reinterpret_cast<unsigned char*>(ptr));
     CHECK(ret == ERR(NONE));
   }

  private:
   mutable jvmtiEnv* env_;
 };

 template <typename T>
 class JvmtiDeleter<T[]> {
  public:
   JvmtiDeleter() : env_(nullptr) {}
   explicit JvmtiDeleter(jvmtiEnv* env) : env_(env) {}

   JvmtiDeleter(JvmtiDeleter&) = default;
   JvmtiDeleter(JvmtiDeleter&&) noexcept = default;
   JvmtiDeleter& operator=(const JvmtiDeleter&) = default;

   template <typename U>
   void operator()(U* ptr) const {
     CHECK(env_ != nullptr);
     jvmtiError ret = env_->Deallocate(reinterpret_cast<unsigned char*>(ptr));
     CHECK(ret == ERR(NONE));
   }

  private:
   mutable jvmtiEnv* env_;
 };

 template <typename T>
 using JvmtiUniquePtr = std::unique_ptr<T, JvmtiDeleter<T>>;

 template <typename T>
 ALWAYS_INLINE
 static inline JvmtiUniquePtr<T> MakeJvmtiUniquePtr(jvmtiEnv* env, T* mem) {
   return JvmtiUniquePtr<T>(mem, JvmtiDeleter<T>(env));
 }

 template <typename T>
 ALWAYS_INLINE
 static inline JvmtiUniquePtr<T> MakeJvmtiUniquePtr(jvmtiEnv* env, unsigned char* mem) {
   return JvmtiUniquePtr<T>(reinterpret_cast<T*>(mem), JvmtiDeleter<T>(env));
 }

 template <typename T>
 ALWAYS_INLINE
 static inline JvmtiUniquePtr<T> AllocJvmtiUniquePtr(jvmtiEnv* env, jvmtiError* error) {
   unsigned char* tmp;
   *error = env->Allocate(sizeof(T), &tmp);
   if (*error != ERR(NONE)) {
     return JvmtiUniquePtr<T>();
   }
   return JvmtiUniquePtr<T>(tmp, JvmtiDeleter<T>(env));
 }

 template <typename T>
 ALWAYS_INLINE
 static inline JvmtiUniquePtr<T> AllocJvmtiUniquePtr(jvmtiEnv* env,
                                                     size_t count,
                                                     jvmtiError* error) {
   unsigned char* tmp;
   *error = env->Allocate(sizeof(typename std::remove_extent<T>::type) * count, &tmp);
   if (*error != ERR(NONE)) {
     return JvmtiUniquePtr<T>();
   }
   return JvmtiUniquePtr<T>(reinterpret_cast<typename std::remove_extent<T>::type*>(tmp),
                            JvmtiDeleter<T>(env));
 }

 ALWAYS_INLINE
 static inline jvmtiError CopyDataIntoJvmtiBuffer(ArtJvmTiEnv* env,
                                                  const unsigned char* source,
                                                  jint len,
                                                  /*out*/unsigned char** dest) {
   jvmtiError res = env->Allocate(len, dest);
   if (res != OK) {
     return res;
   }
   memcpy(reinterpret_cast<void*>(*dest),
          reinterpret_cast<const void*>(source),
          len);
   return OK;
 }

 ALWAYS_INLINE
 static inline JvmtiUniquePtr<char[]> CopyString(jvmtiEnv* env, const char* src, jvmtiError* error) {
   if (src == nullptr) {
     JvmtiUniquePtr<char[]> ret = AllocJvmtiUniquePtr<char[]>(env, 0, error);
     return ret;
   }
   size_t len = strlen(src) + 1;
   JvmtiUniquePtr<char[]> ret = AllocJvmtiUniquePtr<char[]>(env, len, error);
   if (ret != nullptr) {
     strlcpy(ret.get(), src, len);
   }
   return ret;
 }

 const jvmtiCapabilities kPotentialCapabilities = {
     .can_tag_objects                                 = 1,
     .can_generate_field_modification_events          = 1,
     .can_generate_field_access_events                = 1,
     .can_get_bytecodes                               = 1,
     .can_get_synthetic_attribute                     = 1,
     .can_get_owned_monitor_info                      = 1,
     .can_get_current_contended_monitor               = 1,
     .can_get_monitor_info                            = 1,
     .can_pop_frame                                   = 1,
     .can_redefine_classes                            = 1,
     .can_signal_thread                               = 1,
     .can_get_source_file_name                        = 1,
     .can_get_line_numbers                            = 1,
     .can_get_source_debug_extension                  = 1,
     .can_access_local_variables                      = 1,
     .can_maintain_original_method_order              = 1,
     .can_generate_single_step_events                 = 1,
     .can_generate_exception_events                   = 1,
     .can_generate_frame_pop_events                   = 1,
     .can_generate_breakpoint_events                  = 1,
     .can_suspend                                     = 1,
     .can_redefine_any_class                          = 0,
     .can_get_current_thread_cpu_time                 = 0,
     .can_get_thread_cpu_time                         = 0,
     .can_generate_method_entry_events                = 1,
     .can_generate_method_exit_events                 = 1,
     .can_generate_all_class_hook_events              = 0,
     .can_generate_compiled_method_load_events        = 0,
     .can_generate_monitor_events                     = 1,
     .can_generate_vm_object_alloc_events             = 1,
     .can_generate_native_method_bind_events          = 1,
     .can_generate_garbage_collection_events          = 1,
     .can_generate_object_free_events                 = 1,
     .can_force_early_return                          = 1,
     .can_get_owned_monitor_stack_depth_info          = 1,
     .can_get_constant_pool                           = 0,
     .can_set_native_method_prefix                    = 0,
     .can_retransform_classes                         = 1,
     .can_retransform_any_class                       = 0,
     .can_generate_resource_exhaustion_heap_events    = 0,
     .can_generate_resource_exhaustion_threads_events = 0,
 };

 // These are capabilities that are disabled if we were loaded without being debuggable.
 //
 // This includes the following capabilities:
 //   can_retransform_any_class:
 //   can_retransform_classes:
 //   can_redefine_any_class:
 //   can_redefine_classes:
 //   can_pop_frame:
 //   can_force_early_return:
 //     We need to ensure that inlined code is either not present or can always be deoptimized. This
 //     is not guaranteed for non-debuggable processes since we might have inlined bootclasspath code
 //     on a threads stack.
 const jvmtiCapabilities kNonDebuggableUnsupportedCapabilities = {
     .can_tag_objects                                 = 0,
     .can_generate_field_modification_events          = 0,
     .can_generate_field_access_events                = 0,
     .can_get_bytecodes                               = 0,
     .can_get_synthetic_attribute                     = 0,
     .can_get_owned_monitor_info                      = 0,
     .can_get_current_contended_monitor               = 0,
     .can_get_monitor_info                            = 0,
     .can_pop_frame                                   = 1,
     .can_redefine_classes                            = 1,
     .can_signal_thread                               = 0,
     .can_get_source_file_name                        = 0,
     .can_get_line_numbers                            = 0,
     .can_get_source_debug_extension                  = 0,
     .can_access_local_variables                      = 0,
     .can_maintain_original_method_order              = 0,
     .can_generate_single_step_events                 = 0,
     .can_generate_exception_events                   = 0,
     .can_generate_frame_pop_events                   = 0,
     .can_generate_breakpoint_events                  = 0,
     .can_suspend                                     = 0,
     .can_redefine_any_class                          = 1,
     .can_get_current_thread_cpu_time                 = 0,
     .can_get_thread_cpu_time                         = 0,
     .can_generate_method_entry_events                = 0,
     .can_generate_method_exit_events                 = 0,
     .can_generate_all_class_hook_events              = 0,
     .can_generate_compiled_method_load_events        = 0,
     .can_generate_monitor_events                     = 0,
     .can_generate_vm_object_alloc_events             = 0,
     .can_generate_native_method_bind_events          = 0,
     .can_generate_garbage_collection_events          = 0,
     .can_generate_object_free_events                 = 0,
     .can_force_early_return                          = 1,
     .can_get_owned_monitor_stack_depth_info          = 0,
     .can_get_constant_pool                           = 0,
     .can_set_native_method_prefix                    = 0,
     .can_retransform_classes                         = 1,
     .can_retransform_any_class                       = 1,
     .can_generate_resource_exhaustion_heap_events    = 0,
     .can_generate_resource_exhaustion_threads_events = 0,
 };

 }  // namespace openjdkjvmti

 #endif  // ART_OPENJDKJVMTI_ART_JVMTI_H_
	/* Copyright (C) 2016 The Android Open Source Project
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This file implements interfaces from the file jvmti.h. This implementation
	* is licensed under the same terms as the file jvmti.h. The
	* copyright and license information for the file jvmti.h follows.
	*
	* Copyright (c) 2003, 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.
	*/

	#ifndef ART_OPENJDKJVMTI_ART_JVMTI_H_
	#define ART_OPENJDKJVMTI_ART_JVMTI_H_

	#include <memory>
	#include <type_traits>
	#include <unordered_map>
	#include <unordered_set>

	#include <jni.h>

	#include <android-base/logging.h>

	#include "deopt_manager.h"
	#include "base/casts.h"
	#include "base/macros.h"
	#include "base/strlcpy.h"
	#include "base/mutex.h"
	#include "events.h"
	#include "instrumentation.h"
	#include "jni/java_vm_ext.h"
	#include "jni/jni_env_ext.h"
	#include "jvmti.h"
	#include "runtime.h"
	#include "ti_breakpoint.h"

	namespace art {
	class ArtField;
	class ArtMethod;
	class ShadowFrame;
	} // namespace art

	namespace openjdkjvmti {

	class ObjectTagTable;

	// A special version that we use to identify special tooling interface versions which mostly matches
	// the jvmti spec but everything is best effort. This is used to implement the userdebug
	// 'debug-anything' behavior.
	//
	// This is the value 0x70010200.
	static constexpr jint kArtTiVersion = JVMTI_VERSION_1_2 \| 0x40000000;

	// Returns whether we are able to use all jvmti features.
	static inline bool IsFullJvmtiAvailable() {
	art::Runtime* runtime = art::Runtime::Current();
	return runtime->GetInstrumentation()->IsForcedInterpretOnly() \|\|
	runtime->IsJavaDebuggableAtInit();
	}

	// A structure that is a jvmtiEnv with additional information for the runtime.
	struct ArtJvmTiEnv : public jvmtiEnv {
	art::JavaVMExt* art_vm;
	void* local_data;

	// The ti_version we are compatible with. This is only for giving the correct value for GetVersion
	// when running on a userdebug/eng device.
	jint ti_version;

	jvmtiCapabilities capabilities;

	EventMasks event_masks;
	std::unique_ptr<ArtJvmtiEventCallbacks> event_callbacks;

	// Tagging is specific to the jvmtiEnv.
	std::unique_ptr<ObjectTagTable> object_tag_table;

	// Set of watched fields is unique to each jvmtiEnv.
	// TODO It might be good to follow the RI and only let one jvmtiEnv ever have the watch caps so
	// we can record this on the field directly. We could do this either using free access-flag bits
	// or by putting a list in the ClassExt of a field's DeclaringClass.
	// TODO Maybe just have an extension to let one put a watch on every field, that would probably be
	// good enough maybe since you probably want either a few or all/almost all of them.
	std::unordered_set<art::ArtField*> access_watched_fields GUARDED_BY(event_info_mutex_);
	std::unordered_set<art::ArtField*> modify_watched_fields GUARDED_BY(event_info_mutex_);

	// Set of breakpoints is unique to each jvmtiEnv.
	std::unordered_set<Breakpoint> breakpoints GUARDED_BY(event_info_mutex_);
	std::unordered_set<const art::ShadowFrame*> notify_frames GUARDED_BY(event_info_mutex_);

	// RW lock to protect access to all of the event data.
	art::ReaderWriterMutex event_info_mutex_ DEFAULT_MUTEX_ACQUIRED_AFTER;

	std::string last_error_ GUARDED_BY(last_error_mutex_);
	// Lock to touch the last-error-message.
	art::Mutex last_error_mutex_ BOTTOM_MUTEX_ACQUIRED_AFTER;

	ArtJvmTiEnv(art::JavaVMExt* runtime, EventHandler* event_handler, jint ti_version);

	static ArtJvmTiEnv* AsArtJvmTiEnv(jvmtiEnv* env) {
	return art::down_cast<ArtJvmTiEnv*>(env);
	}

	// Top level lock. Nothing can be held when we get this except for mutator lock for full
	// thread-suspension.
	static art::Mutex *gEnvMutex ACQUIRED_AFTER(art::Locks::mutator_lock_);
	};

	// Macro and constexpr to make error values less annoying to write.
	#define ERR(e) JVMTI_ERROR_ ## e
	static constexpr jvmtiError OK = JVMTI_ERROR_NONE;

	// Special error code for unimplemented functions in JVMTI
	static constexpr jvmtiError ERR(NOT_IMPLEMENTED) = JVMTI_ERROR_NOT_AVAILABLE;

	static inline JNIEnv* GetJniEnv(jvmtiEnv* env) {
	JNIEnv* ret_value = nullptr;
	jint res = reinterpret_cast<ArtJvmTiEnv*>(env)->art_vm->GetEnv(
	reinterpret_cast<void**>(&ret_value), JNI_VERSION_1_1);
	if (res != JNI_OK) {
	return nullptr;
	}
	return ret_value;
	}

	template <typename T>
	class JvmtiDeleter {
	public:
	JvmtiDeleter() : env_(nullptr) {}
	explicit JvmtiDeleter(jvmtiEnv* env) : env_(env) {}

	JvmtiDeleter(JvmtiDeleter&) = default;
	JvmtiDeleter(JvmtiDeleter&&) noexcept = default;
	JvmtiDeleter& operator=(const JvmtiDeleter&) = default;

	void operator()(T* ptr) const {
	CHECK(env_ != nullptr);
	jvmtiError ret = env_->Deallocate(reinterpret_cast<unsigned char*>(ptr));
	CHECK(ret == ERR(NONE));
	}

	private:
	mutable jvmtiEnv* env_;
	};

	template <typename T>
	class JvmtiDeleter<T[]> {
	public:
	JvmtiDeleter() : env_(nullptr) {}
	explicit JvmtiDeleter(jvmtiEnv* env) : env_(env) {}

	JvmtiDeleter(JvmtiDeleter&) = default;
	JvmtiDeleter(JvmtiDeleter&&) noexcept = default;
	JvmtiDeleter& operator=(const JvmtiDeleter&) = default;

	template <typename U>
	void operator()(U* ptr) const {
	CHECK(env_ != nullptr);
	jvmtiError ret = env_->Deallocate(reinterpret_cast<unsigned char*>(ptr));
	CHECK(ret == ERR(NONE));
	}

	private:
	mutable jvmtiEnv* env_;
	};

	template <typename T>
	using JvmtiUniquePtr = std::unique_ptr<T, JvmtiDeleter<T>>;

	template <typename T>
	ALWAYS_INLINE
	static inline JvmtiUniquePtr<T> MakeJvmtiUniquePtr(jvmtiEnv* env, T* mem) {
	return JvmtiUniquePtr<T>(mem, JvmtiDeleter<T>(env));
	}

	template <typename T>
	ALWAYS_INLINE
	static inline JvmtiUniquePtr<T> MakeJvmtiUniquePtr(jvmtiEnv* env, unsigned char* mem) {
	return JvmtiUniquePtr<T>(reinterpret_cast<T*>(mem), JvmtiDeleter<T>(env));
	}

	template <typename T>
	ALWAYS_INLINE
	static inline JvmtiUniquePtr<T> AllocJvmtiUniquePtr(jvmtiEnv* env, jvmtiError* error) {
	unsigned char* tmp;
	*error = env->Allocate(sizeof(T), &tmp);
	if (*error != ERR(NONE)) {
	return JvmtiUniquePtr<T>();
	}
	return JvmtiUniquePtr<T>(tmp, JvmtiDeleter<T>(env));
	}

	template <typename T>
	ALWAYS_INLINE
	static inline JvmtiUniquePtr<T> AllocJvmtiUniquePtr(jvmtiEnv* env,
	size_t count,
	jvmtiError* error) {
	unsigned char* tmp;
	error = env->Allocate(sizeof(typename std::remove_extent<T>::type) count, &tmp);
	if (*error != ERR(NONE)) {
	return JvmtiUniquePtr<T>();
	}
	return JvmtiUniquePtr<T>(reinterpret_cast<typename std::remove_extent<T>::type*>(tmp),
	JvmtiDeleter<T>(env));
	}

	ALWAYS_INLINE
	static inline jvmtiError CopyDataIntoJvmtiBuffer(ArtJvmTiEnv* env,
	const unsigned char* source,
	jint len,
	/out/unsigned char** dest) {
	jvmtiError res = env->Allocate(len, dest);
	if (res != OK) {
	return res;
	}
	memcpy(reinterpret_cast<void>(dest),
	reinterpret_cast<const void*>(source),
	len);
	return OK;
	}

	ALWAYS_INLINE
	static inline JvmtiUniquePtr<char[]> CopyString(jvmtiEnv* env, const char* src, jvmtiError* error) {
	if (src == nullptr) {
	JvmtiUniquePtr<char[]> ret = AllocJvmtiUniquePtr<char[]>(env, 0, error);
	return ret;
	}
	size_t len = strlen(src) + 1;
	JvmtiUniquePtr<char[]> ret = AllocJvmtiUniquePtr<char[]>(env, len, error);
	if (ret != nullptr) {
	strlcpy(ret.get(), src, len);
	}
	return ret;
	}

	const jvmtiCapabilities kPotentialCapabilities = {
	.can_tag_objects = 1,
	.can_generate_field_modification_events = 1,
	.can_generate_field_access_events = 1,
	.can_get_bytecodes = 1,
	.can_get_synthetic_attribute = 1,
	.can_get_owned_monitor_info = 1,
	.can_get_current_contended_monitor = 1,
	.can_get_monitor_info = 1,
	.can_pop_frame = 1,
	.can_redefine_classes = 1,
	.can_signal_thread = 1,
	.can_get_source_file_name = 1,
	.can_get_line_numbers = 1,
	.can_get_source_debug_extension = 1,
	.can_access_local_variables = 1,
	.can_maintain_original_method_order = 1,
	.can_generate_single_step_events = 1,
	.can_generate_exception_events = 1,
	.can_generate_frame_pop_events = 1,
	.can_generate_breakpoint_events = 1,
	.can_suspend = 1,
	.can_redefine_any_class = 0,
	.can_get_current_thread_cpu_time = 0,
	.can_get_thread_cpu_time = 0,
	.can_generate_method_entry_events = 1,
	.can_generate_method_exit_events = 1,
	.can_generate_all_class_hook_events = 0,
	.can_generate_compiled_method_load_events = 0,
	.can_generate_monitor_events = 1,
	.can_generate_vm_object_alloc_events = 1,
	.can_generate_native_method_bind_events = 1,
	.can_generate_garbage_collection_events = 1,
	.can_generate_object_free_events = 1,
	.can_force_early_return = 1,
	.can_get_owned_monitor_stack_depth_info = 1,
	.can_get_constant_pool = 0,
	.can_set_native_method_prefix = 0,
	.can_retransform_classes = 1,
	.can_retransform_any_class = 0,
	.can_generate_resource_exhaustion_heap_events = 0,
	.can_generate_resource_exhaustion_threads_events = 0,
	};

	// These are capabilities that are disabled if we were loaded without being debuggable.
	//
	// This includes the following capabilities:
	// can_retransform_any_class:
	// can_retransform_classes:
	// can_redefine_any_class:
	// can_redefine_classes:
	// can_pop_frame:
	// can_force_early_return:
	// We need to ensure that inlined code is either not present or can always be deoptimized. This
	// is not guaranteed for non-debuggable processes since we might have inlined bootclasspath code
	// on a threads stack.
	const jvmtiCapabilities kNonDebuggableUnsupportedCapabilities = {
	.can_tag_objects = 0,
	.can_generate_field_modification_events = 0,
	.can_generate_field_access_events = 0,
	.can_get_bytecodes = 0,
	.can_get_synthetic_attribute = 0,
	.can_get_owned_monitor_info = 0,
	.can_get_current_contended_monitor = 0,
	.can_get_monitor_info = 0,
	.can_pop_frame = 1,
	.can_redefine_classes = 1,
	.can_signal_thread = 0,
	.can_get_source_file_name = 0,
	.can_get_line_numbers = 0,
	.can_get_source_debug_extension = 0,
	.can_access_local_variables = 0,
	.can_maintain_original_method_order = 0,
	.can_generate_single_step_events = 0,
	.can_generate_exception_events = 0,
	.can_generate_frame_pop_events = 0,
	.can_generate_breakpoint_events = 0,
	.can_suspend = 0,
	.can_redefine_any_class = 1,
	.can_get_current_thread_cpu_time = 0,
	.can_get_thread_cpu_time = 0,
	.can_generate_method_entry_events = 0,
	.can_generate_method_exit_events = 0,
	.can_generate_all_class_hook_events = 0,
	.can_generate_compiled_method_load_events = 0,
	.can_generate_monitor_events = 0,
	.can_generate_vm_object_alloc_events = 0,
	.can_generate_native_method_bind_events = 0,
	.can_generate_garbage_collection_events = 0,
	.can_generate_object_free_events = 0,
	.can_force_early_return = 1,
	.can_get_owned_monitor_stack_depth_info = 0,
	.can_get_constant_pool = 0,
	.can_set_native_method_prefix = 0,
	.can_retransform_classes = 1,
	.can_retransform_any_class = 1,
	.can_generate_resource_exhaustion_heap_events = 0,
	.can_generate_resource_exhaustion_threads_events = 0,
	};

	} // namespace openjdkjvmti

	#endif // ART_OPENJDKJVMTI_ART_JVMTI_H_