/*
* 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 CC_INTERP
jc.can_pop_frame = 1;
jc.can_force_early_return = 1;
#endif // !CC_INTERP
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