0N/A/*
1472N/A * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
1472N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1472N/A * or visit www.oracle.com if you need additional information or have any
1472N/A * questions.
0N/A *
0N/A */
0N/A
1879N/A#include "precompiled.hpp"
1879N/A#include "jvmtifiles/jvmtiEnv.hpp"
1879N/A#include "prims/jvmtiExport.hpp"
1879N/A#include "prims/jvmtiManageCapabilities.hpp"
0N/Astatic const jint CAPA_SIZE = (JVMTI_INTERNAL_CAPABILITY_COUNT + 7) / 8;
0N/A
0N/A // capabilities which are always potentially available
0N/AjvmtiCapabilities JvmtiManageCapabilities::always_capabilities;
0N/A
0N/A // capabilities which are potentially available during OnLoad
0N/AjvmtiCapabilities JvmtiManageCapabilities::onload_capabilities;
0N/A
0N/A // capabilities which are always potentially available
0N/A // but to only one environment
0N/AjvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities;
0N/A
0N/A // capabilities which are potentially available during OnLoad
0N/A // but to only one environment
0N/AjvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities;
0N/A
0N/A // remaining capabilities which are always potentially available
0N/A // but to only one environment
0N/AjvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities;
0N/A
0N/A // remaining capabilities which are potentially available during OnLoad
0N/A // but to only one environment
0N/AjvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities;
0N/A
0N/A // all capabilities ever acquired
0N/AjvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities;
0N/A
0N/Avoid JvmtiManageCapabilities::initialize() {
0N/A always_capabilities = init_always_capabilities();
0N/A if (JvmtiEnv::get_phase() != JVMTI_PHASE_ONLOAD) {
0N/A recompute_always_capabilities();
0N/A }
0N/A onload_capabilities = init_onload_capabilities();
0N/A always_solo_capabilities = init_always_solo_capabilities();
0N/A onload_solo_capabilities = init_onload_solo_capabilities();
0N/A always_solo_remaining_capabilities = init_always_solo_capabilities();
0N/A onload_solo_remaining_capabilities = init_onload_solo_capabilities();
0N/A memset(&acquired_capabilities, 0, sizeof(acquired_capabilities));
0N/A}
0N/A
0N/A// if the capability sets are initialized in the onload phase then
0N/A// it happens before class data sharing (CDS) is initialized. If it
0N/A// turns out that CDS gets disabled then we must adjust the always
0N/A// capabilities. To ensure a consistent view of the capabililties
0N/A// anything we add here should already be in the onload set.
0N/Avoid JvmtiManageCapabilities::recompute_always_capabilities() {
0N/A if (!UseSharedSpaces) {
0N/A jvmtiCapabilities jc = always_capabilities;
0N/A jc.can_generate_all_class_hook_events = 1;
0N/A always_capabilities = jc;
0N/A }
0N/A}
0N/A
0N/A
0N/A// corresponding init functions
0N/AjvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() {
0N/A jvmtiCapabilities jc;
0N/A
0N/A memset(&jc, 0, sizeof(jc));
0N/A jc.can_get_bytecodes = 1;
0N/A jc.can_signal_thread = 1;
0N/A jc.can_get_source_file_name = 1;
0N/A jc.can_get_line_numbers = 1;
0N/A jc.can_get_synthetic_attribute = 1;
0N/A jc.can_get_monitor_info = 1;
0N/A jc.can_get_constant_pool = 1;
0N/A jc.can_generate_monitor_events = 1;
0N/A jc.can_generate_garbage_collection_events = 1;
0N/A jc.can_generate_compiled_method_load_events = 1;
0N/A jc.can_generate_native_method_bind_events = 1;
0N/A jc.can_generate_vm_object_alloc_events = 1;
0N/A if (os::is_thread_cpu_time_supported()) {
0N/A jc.can_get_current_thread_cpu_time = 1;
0N/A jc.can_get_thread_cpu_time = 1;
0N/A }
0N/A jc.can_redefine_classes = 1;
0N/A jc.can_redefine_any_class = 1;
0N/A jc.can_retransform_classes = 1;
0N/A jc.can_retransform_any_class = 1;
0N/A jc.can_set_native_method_prefix = 1;
0N/A jc.can_tag_objects = 1;
0N/A jc.can_generate_object_free_events = 1;
0N/A jc.can_generate_resource_exhaustion_heap_events = 1;
0N/A jc.can_generate_resource_exhaustion_threads_events = 1;
0N/A return jc;
0N/A}
0N/A
0N/AjvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() {
0N/A jvmtiCapabilities jc;
0N/A
0N/A memset(&jc, 0, sizeof(jc));
1078N/A#ifndef CC_INTERP
0N/A jc.can_pop_frame = 1;
0N/A jc.can_force_early_return = 1;
1078N/A#endif // !CC_INTERP
0N/A jc.can_get_source_debug_extension = 1;
0N/A jc.can_access_local_variables = 1;
0N/A jc.can_maintain_original_method_order = 1;
0N/A jc.can_generate_all_class_hook_events = 1;
0N/A jc.can_generate_single_step_events = 1;
0N/A jc.can_generate_exception_events = 1;
0N/A jc.can_generate_frame_pop_events = 1;
0N/A jc.can_generate_method_entry_events = 1;
0N/A jc.can_generate_method_exit_events = 1;
0N/A jc.can_get_owned_monitor_info = 1;
0N/A jc.can_get_owned_monitor_stack_depth_info = 1;
0N/A jc.can_get_current_contended_monitor = 1;
0N/A // jc.can_get_monitor_info = 1;
0N/A jc.can_tag_objects = 1; // TODO: this should have been removed
0N/A jc.can_generate_object_free_events = 1; // TODO: this should have been removed
0N/A return jc;
0N/A}
0N/A
0N/A
0N/AjvmtiCapabilities JvmtiManageCapabilities::init_always_solo_capabilities() {
0N/A jvmtiCapabilities jc;
0N/A
0N/A memset(&jc, 0, sizeof(jc));
0N/A jc.can_suspend = 1;
0N/A return jc;
0N/A}
0N/A
0N/A
0N/AjvmtiCapabilities JvmtiManageCapabilities::init_onload_solo_capabilities() {
0N/A jvmtiCapabilities jc;
0N/A
0N/A memset(&jc, 0, sizeof(jc));
0N/A jc.can_generate_field_modification_events = 1;
0N/A jc.can_generate_field_access_events = 1;
0N/A jc.can_generate_breakpoint_events = 1;
0N/A return jc;
0N/A}
0N/A
0N/A
0N/AjvmtiCapabilities *JvmtiManageCapabilities::either(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
0N/A jvmtiCapabilities *result) {
0N/A char *ap = (char *)a;
0N/A char *bp = (char *)b;
0N/A char *resultp = (char *)result;
0N/A
0N/A for (int i = 0; i < CAPA_SIZE; ++i) {
0N/A *resultp++ = *ap++ | *bp++;
0N/A }
0N/A
0N/A return result;
0N/A}
0N/A
0N/A
0N/AjvmtiCapabilities *JvmtiManageCapabilities::both(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
0N/A jvmtiCapabilities *result) {
0N/A char *ap = (char *)a;
0N/A char *bp = (char *)b;
0N/A char *resultp = (char *)result;
0N/A
0N/A for (int i = 0; i < CAPA_SIZE; ++i) {
0N/A *resultp++ = *ap++ & *bp++;
0N/A }
0N/A
0N/A return result;
0N/A}
0N/A
0N/A
0N/AjvmtiCapabilities *JvmtiManageCapabilities::exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
0N/A jvmtiCapabilities *result) {
0N/A char *ap = (char *)a;
0N/A char *bp = (char *)b;
0N/A char *resultp = (char *)result;
0N/A
0N/A for (int i = 0; i < CAPA_SIZE; ++i) {
0N/A *resultp++ = *ap++ & ~*bp++;
0N/A }
0N/A
0N/A return result;
0N/A}
0N/A
0N/A
0N/Abool JvmtiManageCapabilities::has_some(const jvmtiCapabilities *a) {
0N/A char *ap = (char *)a;
0N/A
0N/A for (int i = 0; i < CAPA_SIZE; ++i) {
0N/A if (*ap++ != 0) {
0N/A return true;
0N/A }
0N/A }
0N/A
0N/A return false;
0N/A}
0N/A
0N/A
0N/Avoid JvmtiManageCapabilities::copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to) {
0N/A char *ap = (char *)from;
0N/A char *resultp = (char *)to;
0N/A
0N/A for (int i = 0; i < CAPA_SIZE; ++i) {
0N/A *resultp++ = *ap++;
0N/A }
0N/A}
0N/A
0N/A
0N/Avoid JvmtiManageCapabilities::get_potential_capabilities(const jvmtiCapabilities *current,
0N/A const jvmtiCapabilities *prohibited,
0N/A jvmtiCapabilities *result) {
0N/A // exclude prohibited capabilities, must be before adding current
0N/A exclude(&always_capabilities, prohibited, result);
0N/A
0N/A // must include current since it may possess solo capabilities and now prohibited
0N/A either(result, current, result);
0N/A
0N/A // add other remaining
0N/A either(result, &always_solo_remaining_capabilities, result);
0N/A
0N/A // if this is during OnLoad more capabilities are available
0N/A if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
0N/A either(result, &onload_capabilities, result);
0N/A either(result, &onload_solo_remaining_capabilities, result);
0N/A }
0N/A}
0N/A
0N/AjvmtiError JvmtiManageCapabilities::add_capabilities(const jvmtiCapabilities *current,
0N/A const jvmtiCapabilities *prohibited,
0N/A const jvmtiCapabilities *desired,
0N/A jvmtiCapabilities *result) {
0N/A // check that the capabilities being added are potential capabilities
0N/A jvmtiCapabilities temp;
0N/A get_potential_capabilities(current, prohibited, &temp);
0N/A if (has_some(exclude(desired, &temp, &temp))) {
0N/A return JVMTI_ERROR_NOT_AVAILABLE;
0N/A }
0N/A
0N/A // add to the set of ever acquired capabilities
0N/A either(&acquired_capabilities, desired, &acquired_capabilities);
0N/A
0N/A // onload capabilities that got added are now permanent - so, also remove from onload
0N/A both(&onload_capabilities, desired, &temp);
0N/A either(&always_capabilities, &temp, &always_capabilities);
0N/A exclude(&onload_capabilities, &temp, &onload_capabilities);
0N/A
0N/A // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below)
0N/A both(&onload_solo_capabilities, desired, &temp);
0N/A either(&always_solo_capabilities, &temp, &always_solo_capabilities);
0N/A exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities);
0N/A
0N/A // remove solo capabilities that are now taken
0N/A exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities);
0N/A exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities);
0N/A
0N/A // return the result
0N/A either(current, desired, result);
0N/A
0N/A update();
0N/A
0N/A return JVMTI_ERROR_NONE;
0N/A}
0N/A
0N/A
0N/Avoid JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current,
0N/A const jvmtiCapabilities *unwanted,
0N/A jvmtiCapabilities *result) {
0N/A jvmtiCapabilities to_trash;
0N/A jvmtiCapabilities temp;
0N/A
0N/A // can't give up what you don't have
0N/A both(current, unwanted, &to_trash);
0N/A
0N/A // restore solo capabilities but only those that belong
0N/A either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp),
0N/A &always_solo_remaining_capabilities);
0N/A either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp),
0N/A &onload_solo_remaining_capabilities);
0N/A
0N/A update();
0N/A
0N/A // return the result
0N/A exclude(current, unwanted, result);
0N/A}
0N/A
0N/A
0N/Avoid JvmtiManageCapabilities::update() {
0N/A jvmtiCapabilities avail;
0N/A
0N/A // all capabilities
0N/A either(&always_capabilities, &always_solo_capabilities, &avail);
0N/A
0N/A bool interp_events =
0N/A avail.can_generate_field_access_events ||
0N/A avail.can_generate_field_modification_events ||
0N/A avail.can_generate_single_step_events ||
0N/A avail.can_generate_frame_pop_events ||
0N/A avail.can_generate_method_entry_events ||
0N/A avail.can_generate_method_exit_events;
0N/A bool enter_all_methods =
0N/A interp_events ||
0N/A avail.can_generate_breakpoint_events;
2289N/A if (enter_all_methods) {
2289N/A // Disable these when tracking the bytecodes
2289N/A UseFastEmptyMethods = false;
2289N/A UseFastAccessorMethods = false;
2289N/A }
0N/A
0N/A if (avail.can_generate_breakpoint_events) {
0N/A RewriteFrequentPairs = false;
0N/A }
0N/A
0N/A // If can_redefine_classes is enabled in the onload phase then we know that the
0N/A // dependency information recorded by the compiler is complete.
0N/A if ((avail.can_redefine_classes || avail.can_retransform_classes) &&
0N/A JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
0N/A JvmtiExport::set_all_dependencies_are_recorded(true);
0N/A }
0N/A
0N/A JvmtiExport::set_can_get_source_debug_extension(avail.can_get_source_debug_extension);
0N/A JvmtiExport::set_can_maintain_original_method_order(avail.can_maintain_original_method_order);
0N/A JvmtiExport::set_can_post_interpreter_events(interp_events);
0N/A JvmtiExport::set_can_hotswap_or_post_breakpoint(
0N/A avail.can_generate_breakpoint_events ||
0N/A avail.can_redefine_classes ||
0N/A avail.can_retransform_classes);
0N/A JvmtiExport::set_can_modify_any_class(
0N/A avail.can_generate_breakpoint_events ||
0N/A avail.can_generate_all_class_hook_events);
0N/A JvmtiExport::set_can_walk_any_space(
0N/A avail.can_tag_objects); // disable sharing in onload phase
1397N/A // This controls whether the compilers keep extra locals live to
1397N/A // improve the debugging experience so only set them if the selected
1397N/A // capabilities look like a debugger.
0N/A JvmtiExport::set_can_access_local_variables(
1397N/A avail.can_access_local_variables ||
1397N/A avail.can_generate_breakpoint_events ||
1397N/A avail.can_generate_frame_pop_events);
1213N/A JvmtiExport::set_can_post_on_exceptions(
0N/A avail.can_generate_exception_events ||
0N/A avail.can_generate_frame_pop_events ||
0N/A avail.can_generate_method_exit_events);
0N/A JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events);
0N/A JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events);
0N/A JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events);
0N/A JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events);
0N/A JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events ||
0N/A avail.can_generate_frame_pop_events);
0N/A JvmtiExport::set_can_pop_frame(avail.can_pop_frame);
0N/A JvmtiExport::set_can_force_early_return(avail.can_force_early_return);
0N/A JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events);
0N/A}
0N/A
0N/A#ifndef PRODUCT
0N/A
0N/Avoid JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) {
0N/A tty->print_cr("----- capabilities -----");
0N/A if (cap->can_tag_objects)
0N/A tty->print_cr("can_tag_objects");
0N/A if (cap->can_generate_field_modification_events)
0N/A tty->print_cr("can_generate_field_modification_events");
0N/A if (cap->can_generate_field_access_events)
0N/A tty->print_cr("can_generate_field_access_events");
0N/A if (cap->can_get_bytecodes)
0N/A tty->print_cr("can_get_bytecodes");
0N/A if (cap->can_get_synthetic_attribute)
0N/A tty->print_cr("can_get_synthetic_attribute");
0N/A if (cap->can_get_owned_monitor_info)
0N/A tty->print_cr("can_get_owned_monitor_info");
0N/A if (cap->can_get_current_contended_monitor)
0N/A tty->print_cr("can_get_current_contended_monitor");
0N/A if (cap->can_get_monitor_info)
0N/A tty->print_cr("can_get_monitor_info");
0N/A if (cap->can_get_constant_pool)
0N/A tty->print_cr("can_get_constant_pool");
0N/A if (cap->can_pop_frame)
0N/A tty->print_cr("can_pop_frame");
0N/A if (cap->can_force_early_return)
0N/A tty->print_cr("can_force_early_return");
0N/A if (cap->can_redefine_classes)
0N/A tty->print_cr("can_redefine_classes");
0N/A if (cap->can_retransform_classes)
0N/A tty->print_cr("can_retransform_classes");
0N/A if (cap->can_signal_thread)
0N/A tty->print_cr("can_signal_thread");
0N/A if (cap->can_get_source_file_name)
0N/A tty->print_cr("can_get_source_file_name");
0N/A if (cap->can_get_line_numbers)
0N/A tty->print_cr("can_get_line_numbers");
0N/A if (cap->can_get_source_debug_extension)
0N/A tty->print_cr("can_get_source_debug_extension");
0N/A if (cap->can_access_local_variables)
0N/A tty->print_cr("can_access_local_variables");
0N/A if (cap->can_maintain_original_method_order)
0N/A tty->print_cr("can_maintain_original_method_order");
0N/A if (cap->can_generate_single_step_events)
0N/A tty->print_cr("can_generate_single_step_events");
0N/A if (cap->can_generate_exception_events)
0N/A tty->print_cr("can_generate_exception_events");
0N/A if (cap->can_generate_frame_pop_events)
0N/A tty->print_cr("can_generate_frame_pop_events");
0N/A if (cap->can_generate_breakpoint_events)
0N/A tty->print_cr("can_generate_breakpoint_events");
0N/A if (cap->can_suspend)
0N/A tty->print_cr("can_suspend");
0N/A if (cap->can_redefine_any_class )
0N/A tty->print_cr("can_redefine_any_class");
0N/A if (cap->can_retransform_any_class )
0N/A tty->print_cr("can_retransform_any_class");
0N/A if (cap->can_get_current_thread_cpu_time)
0N/A tty->print_cr("can_get_current_thread_cpu_time");
0N/A if (cap->can_get_thread_cpu_time)
0N/A tty->print_cr("can_get_thread_cpu_time");
0N/A if (cap->can_generate_method_entry_events)
0N/A tty->print_cr("can_generate_method_entry_events");
0N/A if (cap->can_generate_method_exit_events)
0N/A tty->print_cr("can_generate_method_exit_events");
0N/A if (cap->can_generate_all_class_hook_events)
0N/A tty->print_cr("can_generate_all_class_hook_events");
0N/A if (cap->can_generate_compiled_method_load_events)
0N/A tty->print_cr("can_generate_compiled_method_load_events");
0N/A if (cap->can_generate_monitor_events)
0N/A tty->print_cr("can_generate_monitor_events");
0N/A if (cap->can_generate_vm_object_alloc_events)
0N/A tty->print_cr("can_generate_vm_object_alloc_events");
0N/A if (cap->can_generate_native_method_bind_events)
0N/A tty->print_cr("can_generate_native_method_bind_events");
0N/A if (cap->can_generate_garbage_collection_events)
0N/A tty->print_cr("can_generate_garbage_collection_events");
0N/A if (cap->can_generate_object_free_events)
0N/A tty->print_cr("can_generate_object_free_events");
0N/A if (cap->can_generate_resource_exhaustion_heap_events)
0N/A tty->print_cr("can_generate_resource_exhaustion_heap_events");
0N/A if (cap->can_generate_resource_exhaustion_threads_events)
0N/A tty->print_cr("can_generate_resource_exhaustion_threads_events");
0N/A}
0N/A
0N/A#endif