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 /*

  * 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