1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/prims/jvmtiManageCapabilities.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,457 @@
1.4 +/*
1.5 + * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +# include "incls/_precompiled.incl"
1.28 +# include "incls/_jvmtiManageCapabilities.cpp.incl"
1.29 +
1.30 +static const jint CAPA_SIZE = (JVMTI_INTERNAL_CAPABILITY_COUNT + 7) / 8;
1.31 +
1.32 + // capabilities which are always potentially available
1.33 +jvmtiCapabilities JvmtiManageCapabilities::always_capabilities;
1.34 +
1.35 + // capabilities which are potentially available during OnLoad
1.36 +jvmtiCapabilities JvmtiManageCapabilities::onload_capabilities;
1.37 +
1.38 + // capabilities which are always potentially available
1.39 + // but to only one environment
1.40 +jvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities;
1.41 +
1.42 + // capabilities which are potentially available during OnLoad
1.43 + // but to only one environment
1.44 +jvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities;
1.45 +
1.46 + // remaining capabilities which are always potentially available
1.47 + // but to only one environment
1.48 +jvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities;
1.49 +
1.50 + // remaining capabilities which are potentially available during OnLoad
1.51 + // but to only one environment
1.52 +jvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities;
1.53 +
1.54 + // all capabilities ever acquired
1.55 +jvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities;
1.56 +
1.57 +void JvmtiManageCapabilities::initialize() {
1.58 + always_capabilities = init_always_capabilities();
1.59 + if (JvmtiEnv::get_phase() != JVMTI_PHASE_ONLOAD) {
1.60 + recompute_always_capabilities();
1.61 + }
1.62 + onload_capabilities = init_onload_capabilities();
1.63 + always_solo_capabilities = init_always_solo_capabilities();
1.64 + onload_solo_capabilities = init_onload_solo_capabilities();
1.65 + always_solo_remaining_capabilities = init_always_solo_capabilities();
1.66 + onload_solo_remaining_capabilities = init_onload_solo_capabilities();
1.67 + memset(&acquired_capabilities, 0, sizeof(acquired_capabilities));
1.68 +}
1.69 +
1.70 +// if the capability sets are initialized in the onload phase then
1.71 +// it happens before class data sharing (CDS) is initialized. If it
1.72 +// turns out that CDS gets disabled then we must adjust the always
1.73 +// capabilities. To ensure a consistent view of the capabililties
1.74 +// anything we add here should already be in the onload set.
1.75 +void JvmtiManageCapabilities::recompute_always_capabilities() {
1.76 + if (!UseSharedSpaces) {
1.77 + jvmtiCapabilities jc = always_capabilities;
1.78 + jc.can_generate_all_class_hook_events = 1;
1.79 + always_capabilities = jc;
1.80 + }
1.81 +}
1.82 +
1.83 +
1.84 +// corresponding init functions
1.85 +jvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() {
1.86 + jvmtiCapabilities jc;
1.87 +
1.88 + memset(&jc, 0, sizeof(jc));
1.89 + jc.can_get_bytecodes = 1;
1.90 + jc.can_signal_thread = 1;
1.91 + jc.can_get_source_file_name = 1;
1.92 + jc.can_get_line_numbers = 1;
1.93 + jc.can_get_synthetic_attribute = 1;
1.94 + jc.can_get_monitor_info = 1;
1.95 + jc.can_get_constant_pool = 1;
1.96 + jc.can_generate_monitor_events = 1;
1.97 + jc.can_generate_garbage_collection_events = 1;
1.98 + jc.can_generate_compiled_method_load_events = 1;
1.99 + jc.can_generate_native_method_bind_events = 1;
1.100 + jc.can_generate_vm_object_alloc_events = 1;
1.101 + if (os::is_thread_cpu_time_supported()) {
1.102 + jc.can_get_current_thread_cpu_time = 1;
1.103 + jc.can_get_thread_cpu_time = 1;
1.104 + }
1.105 + jc.can_redefine_classes = 1;
1.106 + jc.can_redefine_any_class = 1;
1.107 + jc.can_retransform_classes = 1;
1.108 + jc.can_retransform_any_class = 1;
1.109 + jc.can_set_native_method_prefix = 1;
1.110 + jc.can_tag_objects = 1;
1.111 + jc.can_generate_object_free_events = 1;
1.112 + jc.can_generate_resource_exhaustion_heap_events = 1;
1.113 + jc.can_generate_resource_exhaustion_threads_events = 1;
1.114 + return jc;
1.115 +}
1.116 +
1.117 +jvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() {
1.118 + jvmtiCapabilities jc;
1.119 +
1.120 + memset(&jc, 0, sizeof(jc));
1.121 + jc.can_pop_frame = 1;
1.122 + jc.can_force_early_return = 1;
1.123 + jc.can_get_source_debug_extension = 1;
1.124 + jc.can_access_local_variables = 1;
1.125 + jc.can_maintain_original_method_order = 1;
1.126 + jc.can_generate_all_class_hook_events = 1;
1.127 + jc.can_generate_single_step_events = 1;
1.128 + jc.can_generate_exception_events = 1;
1.129 + jc.can_generate_frame_pop_events = 1;
1.130 + jc.can_generate_method_entry_events = 1;
1.131 + jc.can_generate_method_exit_events = 1;
1.132 + jc.can_get_owned_monitor_info = 1;
1.133 + jc.can_get_owned_monitor_stack_depth_info = 1;
1.134 + jc.can_get_current_contended_monitor = 1;
1.135 + // jc.can_get_monitor_info = 1;
1.136 + jc.can_tag_objects = 1; // TODO: this should have been removed
1.137 + jc.can_generate_object_free_events = 1; // TODO: this should have been removed
1.138 + return jc;
1.139 +}
1.140 +
1.141 +
1.142 +jvmtiCapabilities JvmtiManageCapabilities::init_always_solo_capabilities() {
1.143 + jvmtiCapabilities jc;
1.144 +
1.145 + memset(&jc, 0, sizeof(jc));
1.146 + jc.can_suspend = 1;
1.147 + return jc;
1.148 +}
1.149 +
1.150 +
1.151 +jvmtiCapabilities JvmtiManageCapabilities::init_onload_solo_capabilities() {
1.152 + jvmtiCapabilities jc;
1.153 +
1.154 + memset(&jc, 0, sizeof(jc));
1.155 + jc.can_generate_field_modification_events = 1;
1.156 + jc.can_generate_field_access_events = 1;
1.157 + jc.can_generate_breakpoint_events = 1;
1.158 + return jc;
1.159 +}
1.160 +
1.161 +
1.162 +jvmtiCapabilities *JvmtiManageCapabilities::either(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
1.163 + jvmtiCapabilities *result) {
1.164 + char *ap = (char *)a;
1.165 + char *bp = (char *)b;
1.166 + char *resultp = (char *)result;
1.167 +
1.168 + for (int i = 0; i < CAPA_SIZE; ++i) {
1.169 + *resultp++ = *ap++ | *bp++;
1.170 + }
1.171 +
1.172 + return result;
1.173 +}
1.174 +
1.175 +
1.176 +jvmtiCapabilities *JvmtiManageCapabilities::both(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
1.177 + jvmtiCapabilities *result) {
1.178 + char *ap = (char *)a;
1.179 + char *bp = (char *)b;
1.180 + char *resultp = (char *)result;
1.181 +
1.182 + for (int i = 0; i < CAPA_SIZE; ++i) {
1.183 + *resultp++ = *ap++ & *bp++;
1.184 + }
1.185 +
1.186 + return result;
1.187 +}
1.188 +
1.189 +
1.190 +jvmtiCapabilities *JvmtiManageCapabilities::exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
1.191 + jvmtiCapabilities *result) {
1.192 + char *ap = (char *)a;
1.193 + char *bp = (char *)b;
1.194 + char *resultp = (char *)result;
1.195 +
1.196 + for (int i = 0; i < CAPA_SIZE; ++i) {
1.197 + *resultp++ = *ap++ & ~*bp++;
1.198 + }
1.199 +
1.200 + return result;
1.201 +}
1.202 +
1.203 +
1.204 +bool JvmtiManageCapabilities::has_some(const jvmtiCapabilities *a) {
1.205 + char *ap = (char *)a;
1.206 +
1.207 + for (int i = 0; i < CAPA_SIZE; ++i) {
1.208 + if (*ap++ != 0) {
1.209 + return true;
1.210 + }
1.211 + }
1.212 +
1.213 + return false;
1.214 +}
1.215 +
1.216 +
1.217 +void JvmtiManageCapabilities::copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to) {
1.218 + char *ap = (char *)from;
1.219 + char *resultp = (char *)to;
1.220 +
1.221 + for (int i = 0; i < CAPA_SIZE; ++i) {
1.222 + *resultp++ = *ap++;
1.223 + }
1.224 +}
1.225 +
1.226 +
1.227 +void JvmtiManageCapabilities::get_potential_capabilities(const jvmtiCapabilities *current,
1.228 + const jvmtiCapabilities *prohibited,
1.229 + jvmtiCapabilities *result) {
1.230 + // exclude prohibited capabilities, must be before adding current
1.231 + exclude(&always_capabilities, prohibited, result);
1.232 +
1.233 + // must include current since it may possess solo capabilities and now prohibited
1.234 + either(result, current, result);
1.235 +
1.236 + // add other remaining
1.237 + either(result, &always_solo_remaining_capabilities, result);
1.238 +
1.239 + // if this is during OnLoad more capabilities are available
1.240 + if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
1.241 + either(result, &onload_capabilities, result);
1.242 + either(result, &onload_solo_remaining_capabilities, result);
1.243 + }
1.244 +}
1.245 +
1.246 +jvmtiError JvmtiManageCapabilities::add_capabilities(const jvmtiCapabilities *current,
1.247 + const jvmtiCapabilities *prohibited,
1.248 + const jvmtiCapabilities *desired,
1.249 + jvmtiCapabilities *result) {
1.250 + // check that the capabilities being added are potential capabilities
1.251 + jvmtiCapabilities temp;
1.252 + get_potential_capabilities(current, prohibited, &temp);
1.253 + if (has_some(exclude(desired, &temp, &temp))) {
1.254 + return JVMTI_ERROR_NOT_AVAILABLE;
1.255 + }
1.256 +
1.257 + // add to the set of ever acquired capabilities
1.258 + either(&acquired_capabilities, desired, &acquired_capabilities);
1.259 +
1.260 + // onload capabilities that got added are now permanent - so, also remove from onload
1.261 + both(&onload_capabilities, desired, &temp);
1.262 + either(&always_capabilities, &temp, &always_capabilities);
1.263 + exclude(&onload_capabilities, &temp, &onload_capabilities);
1.264 +
1.265 + // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below)
1.266 + both(&onload_solo_capabilities, desired, &temp);
1.267 + either(&always_solo_capabilities, &temp, &always_solo_capabilities);
1.268 + exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities);
1.269 +
1.270 + // remove solo capabilities that are now taken
1.271 + exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities);
1.272 + exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities);
1.273 +
1.274 + // return the result
1.275 + either(current, desired, result);
1.276 +
1.277 + update();
1.278 +
1.279 + return JVMTI_ERROR_NONE;
1.280 +}
1.281 +
1.282 +
1.283 +void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current,
1.284 + const jvmtiCapabilities *unwanted,
1.285 + jvmtiCapabilities *result) {
1.286 + jvmtiCapabilities to_trash;
1.287 + jvmtiCapabilities temp;
1.288 +
1.289 + // can't give up what you don't have
1.290 + both(current, unwanted, &to_trash);
1.291 +
1.292 + // restore solo capabilities but only those that belong
1.293 + either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp),
1.294 + &always_solo_remaining_capabilities);
1.295 + either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp),
1.296 + &onload_solo_remaining_capabilities);
1.297 +
1.298 + update();
1.299 +
1.300 + // return the result
1.301 + exclude(current, unwanted, result);
1.302 +}
1.303 +
1.304 +
1.305 +void JvmtiManageCapabilities::update() {
1.306 + jvmtiCapabilities avail;
1.307 +
1.308 + // all capabilities
1.309 + either(&always_capabilities, &always_solo_capabilities, &avail);
1.310 +
1.311 + bool interp_events =
1.312 + avail.can_generate_field_access_events ||
1.313 + avail.can_generate_field_modification_events ||
1.314 + avail.can_generate_single_step_events ||
1.315 + avail.can_generate_frame_pop_events ||
1.316 + avail.can_generate_method_entry_events ||
1.317 + avail.can_generate_method_exit_events;
1.318 + bool enter_all_methods =
1.319 + interp_events ||
1.320 + avail.can_generate_breakpoint_events;
1.321 + UseFastEmptyMethods = !enter_all_methods;
1.322 + UseFastAccessorMethods = !enter_all_methods;
1.323 +
1.324 + if (avail.can_generate_breakpoint_events) {
1.325 + RewriteFrequentPairs = false;
1.326 + }
1.327 +
1.328 + // If can_redefine_classes is enabled in the onload phase then we know that the
1.329 + // dependency information recorded by the compiler is complete.
1.330 + if ((avail.can_redefine_classes || avail.can_retransform_classes) &&
1.331 + JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
1.332 + JvmtiExport::set_all_dependencies_are_recorded(true);
1.333 + }
1.334 +
1.335 + JvmtiExport::set_can_get_source_debug_extension(avail.can_get_source_debug_extension);
1.336 + JvmtiExport::set_can_examine_or_deopt_anywhere(
1.337 + avail.can_generate_breakpoint_events ||
1.338 + interp_events ||
1.339 + avail.can_redefine_classes ||
1.340 + avail.can_retransform_classes ||
1.341 + avail.can_access_local_variables ||
1.342 + avail.can_get_owned_monitor_info ||
1.343 + avail.can_get_current_contended_monitor ||
1.344 + avail.can_get_monitor_info ||
1.345 + avail.can_get_owned_monitor_stack_depth_info);
1.346 + JvmtiExport::set_can_maintain_original_method_order(avail.can_maintain_original_method_order);
1.347 + JvmtiExport::set_can_post_interpreter_events(interp_events);
1.348 + JvmtiExport::set_can_hotswap_or_post_breakpoint(
1.349 + avail.can_generate_breakpoint_events ||
1.350 + avail.can_redefine_classes ||
1.351 + avail.can_retransform_classes);
1.352 + JvmtiExport::set_can_modify_any_class(
1.353 + avail.can_generate_breakpoint_events ||
1.354 + avail.can_generate_all_class_hook_events);
1.355 + JvmtiExport::set_can_walk_any_space(
1.356 + avail.can_tag_objects); // disable sharing in onload phase
1.357 + JvmtiExport::set_can_access_local_variables(
1.358 + avail.can_access_local_variables ||
1.359 + avail.can_redefine_classes ||
1.360 + avail.can_retransform_classes);
1.361 + JvmtiExport::set_can_post_exceptions(
1.362 + avail.can_generate_exception_events ||
1.363 + avail.can_generate_frame_pop_events ||
1.364 + avail.can_generate_method_exit_events);
1.365 + JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events);
1.366 + JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events);
1.367 + JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events);
1.368 + JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events);
1.369 + JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events ||
1.370 + avail.can_generate_frame_pop_events);
1.371 + JvmtiExport::set_can_pop_frame(avail.can_pop_frame);
1.372 + JvmtiExport::set_can_force_early_return(avail.can_force_early_return);
1.373 + JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events);
1.374 +}
1.375 +
1.376 +#ifndef PRODUCT
1.377 +
1.378 +void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) {
1.379 + tty->print_cr("----- capabilities -----");
1.380 + if (cap->can_tag_objects)
1.381 + tty->print_cr("can_tag_objects");
1.382 + if (cap->can_generate_field_modification_events)
1.383 + tty->print_cr("can_generate_field_modification_events");
1.384 + if (cap->can_generate_field_access_events)
1.385 + tty->print_cr("can_generate_field_access_events");
1.386 + if (cap->can_get_bytecodes)
1.387 + tty->print_cr("can_get_bytecodes");
1.388 + if (cap->can_get_synthetic_attribute)
1.389 + tty->print_cr("can_get_synthetic_attribute");
1.390 + if (cap->can_get_owned_monitor_info)
1.391 + tty->print_cr("can_get_owned_monitor_info");
1.392 + if (cap->can_get_current_contended_monitor)
1.393 + tty->print_cr("can_get_current_contended_monitor");
1.394 + if (cap->can_get_monitor_info)
1.395 + tty->print_cr("can_get_monitor_info");
1.396 + if (cap->can_get_constant_pool)
1.397 + tty->print_cr("can_get_constant_pool");
1.398 + if (cap->can_pop_frame)
1.399 + tty->print_cr("can_pop_frame");
1.400 + if (cap->can_force_early_return)
1.401 + tty->print_cr("can_force_early_return");
1.402 + if (cap->can_redefine_classes)
1.403 + tty->print_cr("can_redefine_classes");
1.404 + if (cap->can_retransform_classes)
1.405 + tty->print_cr("can_retransform_classes");
1.406 + if (cap->can_signal_thread)
1.407 + tty->print_cr("can_signal_thread");
1.408 + if (cap->can_get_source_file_name)
1.409 + tty->print_cr("can_get_source_file_name");
1.410 + if (cap->can_get_line_numbers)
1.411 + tty->print_cr("can_get_line_numbers");
1.412 + if (cap->can_get_source_debug_extension)
1.413 + tty->print_cr("can_get_source_debug_extension");
1.414 + if (cap->can_access_local_variables)
1.415 + tty->print_cr("can_access_local_variables");
1.416 + if (cap->can_maintain_original_method_order)
1.417 + tty->print_cr("can_maintain_original_method_order");
1.418 + if (cap->can_generate_single_step_events)
1.419 + tty->print_cr("can_generate_single_step_events");
1.420 + if (cap->can_generate_exception_events)
1.421 + tty->print_cr("can_generate_exception_events");
1.422 + if (cap->can_generate_frame_pop_events)
1.423 + tty->print_cr("can_generate_frame_pop_events");
1.424 + if (cap->can_generate_breakpoint_events)
1.425 + tty->print_cr("can_generate_breakpoint_events");
1.426 + if (cap->can_suspend)
1.427 + tty->print_cr("can_suspend");
1.428 + if (cap->can_redefine_any_class )
1.429 + tty->print_cr("can_redefine_any_class");
1.430 + if (cap->can_retransform_any_class )
1.431 + tty->print_cr("can_retransform_any_class");
1.432 + if (cap->can_get_current_thread_cpu_time)
1.433 + tty->print_cr("can_get_current_thread_cpu_time");
1.434 + if (cap->can_get_thread_cpu_time)
1.435 + tty->print_cr("can_get_thread_cpu_time");
1.436 + if (cap->can_generate_method_entry_events)
1.437 + tty->print_cr("can_generate_method_entry_events");
1.438 + if (cap->can_generate_method_exit_events)
1.439 + tty->print_cr("can_generate_method_exit_events");
1.440 + if (cap->can_generate_all_class_hook_events)
1.441 + tty->print_cr("can_generate_all_class_hook_events");
1.442 + if (cap->can_generate_compiled_method_load_events)
1.443 + tty->print_cr("can_generate_compiled_method_load_events");
1.444 + if (cap->can_generate_monitor_events)
1.445 + tty->print_cr("can_generate_monitor_events");
1.446 + if (cap->can_generate_vm_object_alloc_events)
1.447 + tty->print_cr("can_generate_vm_object_alloc_events");
1.448 + if (cap->can_generate_native_method_bind_events)
1.449 + tty->print_cr("can_generate_native_method_bind_events");
1.450 + if (cap->can_generate_garbage_collection_events)
1.451 + tty->print_cr("can_generate_garbage_collection_events");
1.452 + if (cap->can_generate_object_free_events)
1.453 + tty->print_cr("can_generate_object_free_events");
1.454 + if (cap->can_generate_resource_exhaustion_heap_events)
1.455 + tty->print_cr("can_generate_resource_exhaustion_heap_events");
1.456 + if (cap->can_generate_resource_exhaustion_threads_events)
1.457 + tty->print_cr("can_generate_resource_exhaustion_threads_events");
1.458 +}
1.459 +
1.460 +#endif
