src/share/vm/prims/jvmtiManageCapabilities.cpp - platform/external/jetbrains/jdk8u_hotspot - Git at Google

 /*
  * Copyright (c) 2003, 2010, 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.
  *
  * 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.
  *
  */

 #include "precompiled.hpp"
 #include "jvmtifiles/jvmtiEnv.hpp"
 #include "prims/jvmtiExport.hpp"
 #include "prims/jvmtiManageCapabilities.hpp"
 static const jint CAPA_SIZE = (JVMTI_INTERNAL_CAPABILITY_COUNT + 7) / 8;

   // capabilities which are always potentially available
 jvmtiCapabilities JvmtiManageCapabilities::always_capabilities;

   // capabilities which are potentially available during OnLoad
 jvmtiCapabilities JvmtiManageCapabilities::onload_capabilities;

   // capabilities which are always potentially available
   // but to only one environment
 jvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities;

   // capabilities which are potentially available during OnLoad
   // but to only one environment
 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities;

   // remaining capabilities which are always potentially available
   // but to only one environment
 jvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities;

   // remaining capabilities which are potentially available during OnLoad
   // but to only one environment
 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities;

   // all capabilities ever acquired
 jvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities;

 void JvmtiManageCapabilities::initialize() {
   always_capabilities = init_always_capabilities();
   if (JvmtiEnv::get_phase() != JVMTI_PHASE_ONLOAD) {
     recompute_always_capabilities();
   }
   onload_capabilities = init_onload_capabilities();
   always_solo_capabilities = init_always_solo_capabilities();
   onload_solo_capabilities = init_onload_solo_capabilities();
   always_solo_remaining_capabilities = init_always_solo_capabilities();
   onload_solo_remaining_capabilities = init_onload_solo_capabilities();
   memset(&acquired_capabilities, 0, sizeof(acquired_capabilities));
 }

 // if the capability sets are initialized in the onload phase then
 // it happens before class data sharing (CDS) is initialized. If it
 // turns out that CDS gets disabled then we must adjust the always
 // capabilities. To ensure a consistent view of the capabililties
 // anything we add here should already be in the onload set.
 void JvmtiManageCapabilities::recompute_always_capabilities() {
   if (!UseSharedSpaces) {
     jvmtiCapabilities jc = always_capabilities;
     jc.can_generate_all_class_hook_events = 1;
     always_capabilities = jc;
   }
 }


 // corresponding init functions
 jvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() {
   jvmtiCapabilities jc;

   memset(&jc, 0, sizeof(jc));
   jc.can_get_bytecodes = 1;
   jc.can_signal_thread = 1;
   jc.can_get_source_file_name = 1;
   jc.can_get_line_numbers = 1;
   jc.can_get_synthetic_attribute = 1;
   jc.can_get_monitor_info = 1;
   jc.can_get_constant_pool = 1;
   jc.can_generate_monitor_events = 1;
   jc.can_generate_garbage_collection_events = 1;
   jc.can_generate_compiled_method_load_events = 1;
   jc.can_generate_native_method_bind_events = 1;
   jc.can_generate_vm_object_alloc_events = 1;
   if (os::is_thread_cpu_time_supported()) {
     jc.can_get_current_thread_cpu_time = 1;
     jc.can_get_thread_cpu_time = 1;
   }
   jc.can_redefine_classes = 1;
   jc.can_redefine_any_class = 1;
   jc.can_retransform_classes = 1;
   jc.can_retransform_any_class = 1;
   jc.can_set_native_method_prefix = 1;
   jc.can_tag_objects = 1;
   jc.can_generate_object_free_events = 1;
   jc.can_generate_resource_exhaustion_heap_events = 1;
   jc.can_generate_resource_exhaustion_threads_events = 1;
   return jc;
 }

 jvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() {
   jvmtiCapabilities jc;

   memset(&jc, 0, sizeof(jc));
 #ifndef ZERO
   jc.can_pop_frame = 1;
   jc.can_force_early_return = 1;
 #endif // !ZERO
   jc.can_get_source_debug_extension = 1;
   jc.can_access_local_variables = 1;
   jc.can_maintain_original_method_order = 1;
   jc.can_generate_all_class_hook_events = 1;
   jc.can_generate_single_step_events = 1;
   jc.can_generate_exception_events = 1;
   jc.can_generate_frame_pop_events = 1;
   jc.can_generate_method_entry_events = 1;
   jc.can_generate_method_exit_events = 1;
   jc.can_get_owned_monitor_info = 1;
   jc.can_get_owned_monitor_stack_depth_info = 1;
   jc.can_get_current_contended_monitor = 1;
   // jc.can_get_monitor_info = 1;
   jc.can_tag_objects = 1;                 // TODO: this should have been removed
   jc.can_generate_object_free_events = 1; // TODO: this should have been removed
   return jc;
 }


 jvmtiCapabilities JvmtiManageCapabilities::init_always_solo_capabilities() {
   jvmtiCapabilities jc;

   memset(&jc, 0, sizeof(jc));
   jc.can_suspend = 1;
   return jc;
 }


 jvmtiCapabilities JvmtiManageCapabilities::init_onload_solo_capabilities() {
   jvmtiCapabilities jc;

   memset(&jc, 0, sizeof(jc));
   jc.can_generate_field_modification_events = 1;
   jc.can_generate_field_access_events = 1;
   jc.can_generate_breakpoint_events = 1;
   return jc;
 }


 jvmtiCapabilities *JvmtiManageCapabilities::either(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
                                                    jvmtiCapabilities *result) {
   char *ap = (char *)a;
   char *bp = (char *)b;
   char *resultp = (char *)result;

   for (int i = 0; i < CAPA_SIZE; ++i) {
     *resultp++ = *ap++ | *bp++;
   }

   return result;
 }


 jvmtiCapabilities *JvmtiManageCapabilities::both(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
                                                     jvmtiCapabilities *result) {
   char *ap = (char *)a;
   char *bp = (char *)b;
   char *resultp = (char *)result;

   for (int i = 0; i < CAPA_SIZE; ++i) {
     *resultp++ = *ap++ & *bp++;
   }

   return result;
 }


 jvmtiCapabilities *JvmtiManageCapabilities::exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
                                                     jvmtiCapabilities *result) {
   char *ap = (char *)a;
   char *bp = (char *)b;
   char *resultp = (char *)result;

   for (int i = 0; i < CAPA_SIZE; ++i) {
     *resultp++ = *ap++ & ~*bp++;
   }

   return result;
 }


 bool JvmtiManageCapabilities::has_some(const jvmtiCapabilities *a) {
   char *ap = (char *)a;

   for (int i = 0; i < CAPA_SIZE; ++i) {
     if (*ap++ != 0) {
       return true;
     }
   }

   return false;
 }


 void JvmtiManageCapabilities::copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to) {
   char *ap = (char *)from;
   char *resultp = (char *)to;

   for (int i = 0; i < CAPA_SIZE; ++i) {
     *resultp++ = *ap++;
   }
 }


 void JvmtiManageCapabilities::get_potential_capabilities(const jvmtiCapabilities *current,
                                                          const jvmtiCapabilities *prohibited,
                                                          jvmtiCapabilities *result) {
   // exclude prohibited capabilities, must be before adding current
   exclude(&always_capabilities, prohibited, result);

   // must include current since it may possess solo capabilities and now prohibited
   either(result, current, result);

   // add other remaining
   either(result, &always_solo_remaining_capabilities, result);

   // if this is during OnLoad more capabilities are available
   if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
     either(result, &onload_capabilities, result);
     either(result, &onload_solo_remaining_capabilities, result);
   }
 }

 jvmtiError JvmtiManageCapabilities::add_capabilities(const jvmtiCapabilities *current,
                                                      const jvmtiCapabilities *prohibited,
                                                      const jvmtiCapabilities *desired,
                                                      jvmtiCapabilities *result) {
   // check that the capabilities being added are potential capabilities
   jvmtiCapabilities temp;
   get_potential_capabilities(current, prohibited, &temp);
   if (has_some(exclude(desired, &temp, &temp))) {
     return JVMTI_ERROR_NOT_AVAILABLE;
   }

   // add to the set of ever acquired capabilities
   either(&acquired_capabilities, desired, &acquired_capabilities);

   // onload capabilities that got added are now permanent - so, also remove from onload
   both(&onload_capabilities, desired, &temp);
   either(&always_capabilities, &temp, &always_capabilities);
   exclude(&onload_capabilities, &temp, &onload_capabilities);

   // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below)
   both(&onload_solo_capabilities, desired, &temp);
   either(&always_solo_capabilities, &temp, &always_solo_capabilities);
   exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities);

   // remove solo capabilities that are now taken
   exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities);
   exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities);

   // return the result
   either(current, desired, result);

   update();

   return JVMTI_ERROR_NONE;
 }


 void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current,
                                                       const jvmtiCapabilities *unwanted,
                                                       jvmtiCapabilities *result) {
   jvmtiCapabilities to_trash;
   jvmtiCapabilities temp;

   // can't give up what you don't have
   both(current, unwanted, &to_trash);

   // restore solo capabilities but only those that belong
   either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp),
          &always_solo_remaining_capabilities);
   either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp),
          &onload_solo_remaining_capabilities);

   update();

   // return the result
   exclude(current, unwanted, result);
 }


 void JvmtiManageCapabilities::update() {
   jvmtiCapabilities avail;

   // all capabilities
   either(&always_capabilities, &always_solo_capabilities, &avail);

   bool interp_events =
     avail.can_generate_field_access_events ||
     avail.can_generate_field_modification_events ||
     avail.can_generate_single_step_events ||
     avail.can_generate_frame_pop_events ||
     avail.can_generate_method_entry_events ||
     avail.can_generate_method_exit_events;
   bool enter_all_methods =
     interp_events ||
     avail.can_generate_breakpoint_events;
   if (enter_all_methods) {
     // Disable these when tracking the bytecodes
     UseFastEmptyMethods = false;
     UseFastAccessorMethods = false;
   }

   if (avail.can_generate_breakpoint_events) {
     RewriteFrequentPairs = false;
   }

   // If can_redefine_classes is enabled in the onload phase then we know that the
   // dependency information recorded by the compiler is complete.
   if ((avail.can_redefine_classes || avail.can_retransform_classes) &&
       JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
     JvmtiExport::set_all_dependencies_are_recorded(true);
   }

   JvmtiExport::set_can_get_source_debug_extension(avail.can_get_source_debug_extension);
   JvmtiExport::set_can_maintain_original_method_order(avail.can_maintain_original_method_order);
   JvmtiExport::set_can_post_interpreter_events(interp_events);
   JvmtiExport::set_can_hotswap_or_post_breakpoint(
     avail.can_generate_breakpoint_events ||
     avail.can_redefine_classes ||
     avail.can_retransform_classes);
   JvmtiExport::set_can_modify_any_class(
     avail.can_generate_breakpoint_events ||
     avail.can_generate_all_class_hook_events);
   JvmtiExport::set_can_walk_any_space(
     avail.can_tag_objects);   // disable sharing in onload phase
   // This controls whether the compilers keep extra locals live to
   // improve the debugging experience so only set them if the selected
   // capabilities look like a debugger.
   JvmtiExport::set_can_access_local_variables(
     avail.can_access_local_variables ||
     avail.can_generate_breakpoint_events ||
     avail.can_generate_frame_pop_events);
   JvmtiExport::set_can_post_on_exceptions(
     avail.can_generate_exception_events ||
     avail.can_generate_frame_pop_events ||
     avail.can_generate_method_exit_events);
   JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events);
   JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events);
   JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events);
   JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events);
   JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events ||
                                         avail.can_generate_frame_pop_events);
   JvmtiExport::set_can_pop_frame(avail.can_pop_frame);
   JvmtiExport::set_can_force_early_return(avail.can_force_early_return);
   JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events);
 }

 #ifndef PRODUCT

 void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) {
   tty->print_cr("----- capabilities -----");
   if (cap->can_tag_objects)
     tty->print_cr("can_tag_objects");
   if (cap->can_generate_field_modification_events)
     tty->print_cr("can_generate_field_modification_events");
   if (cap->can_generate_field_access_events)
     tty->print_cr("can_generate_field_access_events");
   if (cap->can_get_bytecodes)
     tty->print_cr("can_get_bytecodes");
   if (cap->can_get_synthetic_attribute)
     tty->print_cr("can_get_synthetic_attribute");
   if (cap->can_get_owned_monitor_info)
     tty->print_cr("can_get_owned_monitor_info");
   if (cap->can_get_current_contended_monitor)
     tty->print_cr("can_get_current_contended_monitor");
   if (cap->can_get_monitor_info)
     tty->print_cr("can_get_monitor_info");
   if (cap->can_get_constant_pool)
     tty->print_cr("can_get_constant_pool");
   if (cap->can_pop_frame)
     tty->print_cr("can_pop_frame");
   if (cap->can_force_early_return)
     tty->print_cr("can_force_early_return");
   if (cap->can_redefine_classes)
     tty->print_cr("can_redefine_classes");
   if (cap->can_retransform_classes)
     tty->print_cr("can_retransform_classes");
   if (cap->can_signal_thread)
     tty->print_cr("can_signal_thread");
   if (cap->can_get_source_file_name)
     tty->print_cr("can_get_source_file_name");
   if (cap->can_get_line_numbers)
     tty->print_cr("can_get_line_numbers");
   if (cap->can_get_source_debug_extension)
     tty->print_cr("can_get_source_debug_extension");
   if (cap->can_access_local_variables)
     tty->print_cr("can_access_local_variables");
   if (cap->can_maintain_original_method_order)
     tty->print_cr("can_maintain_original_method_order");
   if (cap->can_generate_single_step_events)
     tty->print_cr("can_generate_single_step_events");
   if (cap->can_generate_exception_events)
     tty->print_cr("can_generate_exception_events");
   if (cap->can_generate_frame_pop_events)
     tty->print_cr("can_generate_frame_pop_events");
   if (cap->can_generate_breakpoint_events)
     tty->print_cr("can_generate_breakpoint_events");
   if (cap->can_suspend)
     tty->print_cr("can_suspend");
   if (cap->can_redefine_any_class )
     tty->print_cr("can_redefine_any_class");
   if (cap->can_retransform_any_class )
     tty->print_cr("can_retransform_any_class");
   if (cap->can_get_current_thread_cpu_time)
     tty->print_cr("can_get_current_thread_cpu_time");
   if (cap->can_get_thread_cpu_time)
     tty->print_cr("can_get_thread_cpu_time");
   if (cap->can_generate_method_entry_events)
     tty->print_cr("can_generate_method_entry_events");
   if (cap->can_generate_method_exit_events)
     tty->print_cr("can_generate_method_exit_events");
   if (cap->can_generate_all_class_hook_events)
     tty->print_cr("can_generate_all_class_hook_events");
   if (cap->can_generate_compiled_method_load_events)
     tty->print_cr("can_generate_compiled_method_load_events");
   if (cap->can_generate_monitor_events)
     tty->print_cr("can_generate_monitor_events");
   if (cap->can_generate_vm_object_alloc_events)
     tty->print_cr("can_generate_vm_object_alloc_events");
   if (cap->can_generate_native_method_bind_events)
     tty->print_cr("can_generate_native_method_bind_events");
   if (cap->can_generate_garbage_collection_events)
     tty->print_cr("can_generate_garbage_collection_events");
   if (cap->can_generate_object_free_events)
     tty->print_cr("can_generate_object_free_events");
   if (cap->can_generate_resource_exhaustion_heap_events)
     tty->print_cr("can_generate_resource_exhaustion_heap_events");
   if (cap->can_generate_resource_exhaustion_threads_events)
     tty->print_cr("can_generate_resource_exhaustion_threads_events");
 }

 #endif
	/*
	* Copyright (c) 2003, 2010, 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.
	*
	* 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.
	*
	*/

	#include "precompiled.hpp"
	#include "jvmtifiles/jvmtiEnv.hpp"
	#include "prims/jvmtiExport.hpp"
	#include "prims/jvmtiManageCapabilities.hpp"
	static const jint CAPA_SIZE = (JVMTI_INTERNAL_CAPABILITY_COUNT + 7) / 8;

	// capabilities which are always potentially available
	jvmtiCapabilities JvmtiManageCapabilities::always_capabilities;

	// capabilities which are potentially available during OnLoad
	jvmtiCapabilities JvmtiManageCapabilities::onload_capabilities;

	// capabilities which are always potentially available
	// but to only one environment
	jvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities;

	// capabilities which are potentially available during OnLoad
	// but to only one environment
	jvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities;

	// remaining capabilities which are always potentially available
	// but to only one environment
	jvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities;

	// remaining capabilities which are potentially available during OnLoad
	// but to only one environment
	jvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities;

	// all capabilities ever acquired
	jvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities;

	void JvmtiManageCapabilities::initialize() {
	always_capabilities = init_always_capabilities();
	if (JvmtiEnv::get_phase() != JVMTI_PHASE_ONLOAD) {
	recompute_always_capabilities();
	}
	onload_capabilities = init_onload_capabilities();
	always_solo_capabilities = init_always_solo_capabilities();
	onload_solo_capabilities = init_onload_solo_capabilities();
	always_solo_remaining_capabilities = init_always_solo_capabilities();
	onload_solo_remaining_capabilities = init_onload_solo_capabilities();
	memset(&acquired_capabilities, 0, sizeof(acquired_capabilities));
	}

	// if the capability sets are initialized in the onload phase then
	// it happens before class data sharing (CDS) is initialized. If it
	// turns out that CDS gets disabled then we must adjust the always
	// capabilities. To ensure a consistent view of the capabililties
	// anything we add here should already be in the onload set.
	void JvmtiManageCapabilities::recompute_always_capabilities() {
	if (!UseSharedSpaces) {
	jvmtiCapabilities jc = always_capabilities;
	jc.can_generate_all_class_hook_events = 1;
	always_capabilities = jc;
	}
	}


	// corresponding init functions
	jvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() {
	jvmtiCapabilities jc;

	memset(&jc, 0, sizeof(jc));
	jc.can_get_bytecodes = 1;
	jc.can_signal_thread = 1;
	jc.can_get_source_file_name = 1;
	jc.can_get_line_numbers = 1;
	jc.can_get_synthetic_attribute = 1;
	jc.can_get_monitor_info = 1;
	jc.can_get_constant_pool = 1;
	jc.can_generate_monitor_events = 1;
	jc.can_generate_garbage_collection_events = 1;
	jc.can_generate_compiled_method_load_events = 1;
	jc.can_generate_native_method_bind_events = 1;
	jc.can_generate_vm_object_alloc_events = 1;
	if (os::is_thread_cpu_time_supported()) {
	jc.can_get_current_thread_cpu_time = 1;
	jc.can_get_thread_cpu_time = 1;
	}
	jc.can_redefine_classes = 1;
	jc.can_redefine_any_class = 1;
	jc.can_retransform_classes = 1;
	jc.can_retransform_any_class = 1;
	jc.can_set_native_method_prefix = 1;
	jc.can_tag_objects = 1;
	jc.can_generate_object_free_events = 1;
	jc.can_generate_resource_exhaustion_heap_events = 1;
	jc.can_generate_resource_exhaustion_threads_events = 1;
	return jc;
	}

	jvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() {
	jvmtiCapabilities jc;

	memset(&jc, 0, sizeof(jc));
	#ifndef ZERO
	jc.can_pop_frame = 1;
	jc.can_force_early_return = 1;
	#endif // !ZERO
	jc.can_get_source_debug_extension = 1;
	jc.can_access_local_variables = 1;
	jc.can_maintain_original_method_order = 1;
	jc.can_generate_all_class_hook_events = 1;
	jc.can_generate_single_step_events = 1;
	jc.can_generate_exception_events = 1;
	jc.can_generate_frame_pop_events = 1;
	jc.can_generate_method_entry_events = 1;
	jc.can_generate_method_exit_events = 1;
	jc.can_get_owned_monitor_info = 1;
	jc.can_get_owned_monitor_stack_depth_info = 1;
	jc.can_get_current_contended_monitor = 1;
	// jc.can_get_monitor_info = 1;
	jc.can_tag_objects = 1; // TODO: this should have been removed
	jc.can_generate_object_free_events = 1; // TODO: this should have been removed
	return jc;
	}


	jvmtiCapabilities JvmtiManageCapabilities::init_always_solo_capabilities() {
	jvmtiCapabilities jc;

	memset(&jc, 0, sizeof(jc));
	jc.can_suspend = 1;
	return jc;
	}


	jvmtiCapabilities JvmtiManageCapabilities::init_onload_solo_capabilities() {
	jvmtiCapabilities jc;

	memset(&jc, 0, sizeof(jc));
	jc.can_generate_field_modification_events = 1;
	jc.can_generate_field_access_events = 1;
	jc.can_generate_breakpoint_events = 1;
	return jc;
	}


	jvmtiCapabilities JvmtiManageCapabilities::either(const jvmtiCapabilities a, const jvmtiCapabilities *b,
	jvmtiCapabilities *result) {
	char ap = (char )a;
	char bp = (char )b;
	char resultp = (char )result;

	for (int i = 0; i < CAPA_SIZE; ++i) {
	resultp++ = ap++ \| *bp++;
	}

	return result;
	}


	jvmtiCapabilities JvmtiManageCapabilities::both(const jvmtiCapabilities a, const jvmtiCapabilities *b,
	jvmtiCapabilities *result) {
	char ap = (char )a;
	char bp = (char )b;
	char resultp = (char )result;

	for (int i = 0; i < CAPA_SIZE; ++i) {
	resultp++ = ap++ & *bp++;
	}

	return result;
	}


	jvmtiCapabilities JvmtiManageCapabilities::exclude(const jvmtiCapabilities a, const jvmtiCapabilities *b,
	jvmtiCapabilities *result) {
	char ap = (char )a;
	char bp = (char )b;
	char resultp = (char )result;

	for (int i = 0; i < CAPA_SIZE; ++i) {
	resultp++ = ap++ & ~*bp++;
	}

	return result;
	}


	bool JvmtiManageCapabilities::has_some(const jvmtiCapabilities *a) {
	char ap = (char )a;

	for (int i = 0; i < CAPA_SIZE; ++i) {
	if (*ap++ != 0) {
	return true;
	}
	}

	return false;
	}


	void JvmtiManageCapabilities::copy_capabilities(const jvmtiCapabilities from, jvmtiCapabilities to) {
	char ap = (char )from;
	char resultp = (char )to;

	for (int i = 0; i < CAPA_SIZE; ++i) {
	resultp++ = ap++;
	}
	}


	void JvmtiManageCapabilities::get_potential_capabilities(const jvmtiCapabilities *current,
	const jvmtiCapabilities *prohibited,
	jvmtiCapabilities *result) {
	// exclude prohibited capabilities, must be before adding current
	exclude(&always_capabilities, prohibited, result);

	// must include current since it may possess solo capabilities and now prohibited
	either(result, current, result);

	// add other remaining
	either(result, &always_solo_remaining_capabilities, result);

	// if this is during OnLoad more capabilities are available
	if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
	either(result, &onload_capabilities, result);
	either(result, &onload_solo_remaining_capabilities, result);
	}
	}

	jvmtiError JvmtiManageCapabilities::add_capabilities(const jvmtiCapabilities *current,
	const jvmtiCapabilities *prohibited,
	const jvmtiCapabilities *desired,
	jvmtiCapabilities *result) {
	// check that the capabilities being added are potential capabilities
	jvmtiCapabilities temp;
	get_potential_capabilities(current, prohibited, &temp);
	if (has_some(exclude(desired, &temp, &temp))) {
	return JVMTI_ERROR_NOT_AVAILABLE;
	}

	// add to the set of ever acquired capabilities
	either(&acquired_capabilities, desired, &acquired_capabilities);

	// onload capabilities that got added are now permanent - so, also remove from onload
	both(&onload_capabilities, desired, &temp);
	either(&always_capabilities, &temp, &always_capabilities);
	exclude(&onload_capabilities, &temp, &onload_capabilities);

	// same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below)
	both(&onload_solo_capabilities, desired, &temp);
	either(&always_solo_capabilities, &temp, &always_solo_capabilities);
	exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities);

	// remove solo capabilities that are now taken
	exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities);
	exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities);

	// return the result
	either(current, desired, result);

	update();

	return JVMTI_ERROR_NONE;
	}


	void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current,
	const jvmtiCapabilities *unwanted,
	jvmtiCapabilities *result) {
	jvmtiCapabilities to_trash;
	jvmtiCapabilities temp;

	// can't give up what you don't have
	both(current, unwanted, &to_trash);

	// restore solo capabilities but only those that belong
	either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp),
	&always_solo_remaining_capabilities);
	either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp),
	&onload_solo_remaining_capabilities);

	update();

	// return the result
	exclude(current, unwanted, result);
	}


	void JvmtiManageCapabilities::update() {
	jvmtiCapabilities avail;

	// all capabilities
	either(&always_capabilities, &always_solo_capabilities, &avail);

	bool interp_events =
	avail.can_generate_field_access_events \|\|
	avail.can_generate_field_modification_events \|\|
	avail.can_generate_single_step_events \|\|
	avail.can_generate_frame_pop_events \|\|
	avail.can_generate_method_entry_events \|\|
	avail.can_generate_method_exit_events;
	bool enter_all_methods =
	interp_events \|\|
	avail.can_generate_breakpoint_events;
	if (enter_all_methods) {
	// Disable these when tracking the bytecodes
	UseFastEmptyMethods = false;
	UseFastAccessorMethods = false;
	}

	if (avail.can_generate_breakpoint_events) {
	RewriteFrequentPairs = false;
	}

	// If can_redefine_classes is enabled in the onload phase then we know that the
	// dependency information recorded by the compiler is complete.
	if ((avail.can_redefine_classes \|\| avail.can_retransform_classes) &&
	JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
	JvmtiExport::set_all_dependencies_are_recorded(true);
	}

	JvmtiExport::set_can_get_source_debug_extension(avail.can_get_source_debug_extension);
	JvmtiExport::set_can_maintain_original_method_order(avail.can_maintain_original_method_order);
	JvmtiExport::set_can_post_interpreter_events(interp_events);
	JvmtiExport::set_can_hotswap_or_post_breakpoint(
	avail.can_generate_breakpoint_events \|\|
	avail.can_redefine_classes \|\|
	avail.can_retransform_classes);
	JvmtiExport::set_can_modify_any_class(
	avail.can_generate_breakpoint_events \|\|
	avail.can_generate_all_class_hook_events);
	JvmtiExport::set_can_walk_any_space(
	avail.can_tag_objects); // disable sharing in onload phase
	// This controls whether the compilers keep extra locals live to
	// improve the debugging experience so only set them if the selected
	// capabilities look like a debugger.
	JvmtiExport::set_can_access_local_variables(
	avail.can_access_local_variables \|\|
	avail.can_generate_breakpoint_events \|\|
	avail.can_generate_frame_pop_events);
	JvmtiExport::set_can_post_on_exceptions(
	avail.can_generate_exception_events \|\|
	avail.can_generate_frame_pop_events \|\|
	avail.can_generate_method_exit_events);
	JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events);
	JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events);
	JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events);
	JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events);
	JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events \|\|
	avail.can_generate_frame_pop_events);
	JvmtiExport::set_can_pop_frame(avail.can_pop_frame);
	JvmtiExport::set_can_force_early_return(avail.can_force_early_return);
	JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events);
	}

	#ifndef PRODUCT

	void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) {
	tty->print_cr("----- capabilities -----");
	if (cap->can_tag_objects)
	tty->print_cr("can_tag_objects");
	if (cap->can_generate_field_modification_events)
	tty->print_cr("can_generate_field_modification_events");
	if (cap->can_generate_field_access_events)
	tty->print_cr("can_generate_field_access_events");
	if (cap->can_get_bytecodes)
	tty->print_cr("can_get_bytecodes");
	if (cap->can_get_synthetic_attribute)
	tty->print_cr("can_get_synthetic_attribute");
	if (cap->can_get_owned_monitor_info)
	tty->print_cr("can_get_owned_monitor_info");
	if (cap->can_get_current_contended_monitor)
	tty->print_cr("can_get_current_contended_monitor");
	if (cap->can_get_monitor_info)
	tty->print_cr("can_get_monitor_info");
	if (cap->can_get_constant_pool)
	tty->print_cr("can_get_constant_pool");
	if (cap->can_pop_frame)
	tty->print_cr("can_pop_frame");
	if (cap->can_force_early_return)
	tty->print_cr("can_force_early_return");
	if (cap->can_redefine_classes)
	tty->print_cr("can_redefine_classes");
	if (cap->can_retransform_classes)
	tty->print_cr("can_retransform_classes");
	if (cap->can_signal_thread)
	tty->print_cr("can_signal_thread");
	if (cap->can_get_source_file_name)
	tty->print_cr("can_get_source_file_name");
	if (cap->can_get_line_numbers)
	tty->print_cr("can_get_line_numbers");
	if (cap->can_get_source_debug_extension)
	tty->print_cr("can_get_source_debug_extension");
	if (cap->can_access_local_variables)
	tty->print_cr("can_access_local_variables");
	if (cap->can_maintain_original_method_order)
	tty->print_cr("can_maintain_original_method_order");
	if (cap->can_generate_single_step_events)
	tty->print_cr("can_generate_single_step_events");
	if (cap->can_generate_exception_events)
	tty->print_cr("can_generate_exception_events");
	if (cap->can_generate_frame_pop_events)
	tty->print_cr("can_generate_frame_pop_events");
	if (cap->can_generate_breakpoint_events)
	tty->print_cr("can_generate_breakpoint_events");
	if (cap->can_suspend)
	tty->print_cr("can_suspend");
	if (cap->can_redefine_any_class )
	tty->print_cr("can_redefine_any_class");
	if (cap->can_retransform_any_class )
	tty->print_cr("can_retransform_any_class");
	if (cap->can_get_current_thread_cpu_time)
	tty->print_cr("can_get_current_thread_cpu_time");
	if (cap->can_get_thread_cpu_time)
	tty->print_cr("can_get_thread_cpu_time");
	if (cap->can_generate_method_entry_events)
	tty->print_cr("can_generate_method_entry_events");
	if (cap->can_generate_method_exit_events)
	tty->print_cr("can_generate_method_exit_events");
	if (cap->can_generate_all_class_hook_events)
	tty->print_cr("can_generate_all_class_hook_events");
	if (cap->can_generate_compiled_method_load_events)
	tty->print_cr("can_generate_compiled_method_load_events");
	if (cap->can_generate_monitor_events)
	tty->print_cr("can_generate_monitor_events");
	if (cap->can_generate_vm_object_alloc_events)
	tty->print_cr("can_generate_vm_object_alloc_events");
	if (cap->can_generate_native_method_bind_events)
	tty->print_cr("can_generate_native_method_bind_events");
	if (cap->can_generate_garbage_collection_events)
	tty->print_cr("can_generate_garbage_collection_events");
	if (cap->can_generate_object_free_events)
	tty->print_cr("can_generate_object_free_events");
	if (cap->can_generate_resource_exhaustion_heap_events)
	tty->print_cr("can_generate_resource_exhaustion_heap_events");
	if (cap->can_generate_resource_exhaustion_threads_events)
	tty->print_cr("can_generate_resource_exhaustion_threads_events");
	}

	#endif