1/* 2 * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "jvmtifiles/jvmtiEnv.hpp" 27#include "logging/log.hpp" 28#include "prims/jvmtiExport.hpp" 29#include "prims/jvmtiManageCapabilities.hpp" 30 31static const jint CAPA_SIZE = (JVMTI_INTERNAL_CAPABILITY_COUNT + 7) / 8; 32 33 // capabilities which are always potentially available 34jvmtiCapabilities JvmtiManageCapabilities::always_capabilities; 35 36 // capabilities which are potentially available during OnLoad 37jvmtiCapabilities JvmtiManageCapabilities::onload_capabilities; 38 39 // capabilities which are always potentially available 40 // but to only one environment 41jvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities; 42 43 // capabilities which are potentially available during OnLoad 44 // but to only one environment 45jvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities; 46 47 // remaining capabilities which are always potentially available 48 // but to only one environment 49jvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities; 50 51 // remaining capabilities which are potentially available during OnLoad 52 // but to only one environment 53jvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities; 54 55 // all capabilities ever acquired 56jvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities; 57 58void JvmtiManageCapabilities::initialize() { 59 always_capabilities = init_always_capabilities(); 60 if (JvmtiEnv::get_phase() != JVMTI_PHASE_ONLOAD) { 61 recompute_always_capabilities(); 62 } 63 onload_capabilities = init_onload_capabilities(); 64 always_solo_capabilities = init_always_solo_capabilities(); 65 onload_solo_capabilities = init_onload_solo_capabilities(); 66 always_solo_remaining_capabilities = init_always_solo_capabilities(); 67 onload_solo_remaining_capabilities = init_onload_solo_capabilities(); 68 memset(&acquired_capabilities, 0, sizeof(acquired_capabilities)); 69} 70 71// if the capability sets are initialized in the onload phase then 72// it happens before class data sharing (CDS) is initialized. If it 73// turns out that CDS gets disabled then we must adjust the always 74// capabilities. To ensure a consistent view of the capabililties 75// anything we add here should already be in the onload set. 76void JvmtiManageCapabilities::recompute_always_capabilities() { 77 if (!UseSharedSpaces) { 78 jvmtiCapabilities jc = always_capabilities; 79 jc.can_generate_all_class_hook_events = 1; 80 always_capabilities = jc; 81 } 82} 83 84 85// corresponding init functions 86jvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() { 87 jvmtiCapabilities jc; 88 89 memset(&jc, 0, sizeof(jc)); 90 jc.can_get_bytecodes = 1; 91 jc.can_signal_thread = 1; 92 jc.can_get_source_file_name = 1; 93 jc.can_get_line_numbers = 1; 94 jc.can_get_synthetic_attribute = 1; 95 jc.can_get_monitor_info = 1; 96 jc.can_get_constant_pool = 1; 97 jc.can_generate_monitor_events = 1; 98 jc.can_generate_garbage_collection_events = 1; 99 jc.can_generate_compiled_method_load_events = 1; 100 jc.can_generate_native_method_bind_events = 1; 101 jc.can_generate_vm_object_alloc_events = 1; 102 if (os::is_thread_cpu_time_supported()) { 103 jc.can_get_current_thread_cpu_time = 1; 104 jc.can_get_thread_cpu_time = 1; 105 } 106 jc.can_redefine_classes = 1; 107 jc.can_redefine_any_class = 1; 108 jc.can_retransform_classes = 1; 109 jc.can_retransform_any_class = 1; 110 jc.can_set_native_method_prefix = 1; 111 jc.can_tag_objects = 1; 112 jc.can_generate_object_free_events = 1; 113 jc.can_generate_resource_exhaustion_heap_events = 1; 114 jc.can_generate_resource_exhaustion_threads_events = 1; 115 return jc; 116} 117 118jvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() { 119 jvmtiCapabilities jc; 120 121 memset(&jc, 0, sizeof(jc)); 122#ifndef ZERO 123 jc.can_pop_frame = 1; 124 jc.can_force_early_return = 1; 125#endif // !ZERO 126 jc.can_get_source_debug_extension = 1; 127 jc.can_access_local_variables = 1; 128 jc.can_maintain_original_method_order = 1; 129 jc.can_generate_all_class_hook_events = 1; 130 jc.can_generate_single_step_events = 1; 131 jc.can_generate_exception_events = 1; 132 jc.can_generate_frame_pop_events = 1; 133 jc.can_generate_method_entry_events = 1; 134 jc.can_generate_method_exit_events = 1; 135 jc.can_get_owned_monitor_info = 1; 136 jc.can_get_owned_monitor_stack_depth_info = 1; 137 jc.can_get_current_contended_monitor = 1; 138 jc.can_generate_early_vmstart = 1; 139 jc.can_generate_early_class_hook_events = 1; 140 return jc; 141} 142 143 144jvmtiCapabilities JvmtiManageCapabilities::init_always_solo_capabilities() { 145 jvmtiCapabilities jc; 146 147 memset(&jc, 0, sizeof(jc)); 148 jc.can_suspend = 1; 149 return jc; 150} 151 152 153jvmtiCapabilities JvmtiManageCapabilities::init_onload_solo_capabilities() { 154 jvmtiCapabilities jc; 155 156 memset(&jc, 0, sizeof(jc)); 157 jc.can_generate_field_modification_events = 1; 158 jc.can_generate_field_access_events = 1; 159 jc.can_generate_breakpoint_events = 1; 160 return jc; 161} 162 163 164jvmtiCapabilities *JvmtiManageCapabilities::either(const jvmtiCapabilities *a, const jvmtiCapabilities *b, 165 jvmtiCapabilities *result) { 166 char *ap = (char *)a; 167 char *bp = (char *)b; 168 char *resultp = (char *)result; 169 170 for (int i = 0; i < CAPA_SIZE; ++i) { 171 *resultp++ = *ap++ | *bp++; 172 } 173 174 return result; 175} 176 177 178jvmtiCapabilities *JvmtiManageCapabilities::both(const jvmtiCapabilities *a, const jvmtiCapabilities *b, 179 jvmtiCapabilities *result) { 180 char *ap = (char *)a; 181 char *bp = (char *)b; 182 char *resultp = (char *)result; 183 184 for (int i = 0; i < CAPA_SIZE; ++i) { 185 *resultp++ = *ap++ & *bp++; 186 } 187 188 return result; 189} 190 191 192jvmtiCapabilities *JvmtiManageCapabilities::exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b, 193 jvmtiCapabilities *result) { 194 char *ap = (char *)a; 195 char *bp = (char *)b; 196 char *resultp = (char *)result; 197 198 for (int i = 0; i < CAPA_SIZE; ++i) { 199 *resultp++ = *ap++ & ~*bp++; 200 } 201 202 return result; 203} 204 205 206bool JvmtiManageCapabilities::has_some(const jvmtiCapabilities *a) { 207 char *ap = (char *)a; 208 209 for (int i = 0; i < CAPA_SIZE; ++i) { 210 if (*ap++ != 0) { 211 return true; 212 } 213 } 214 215 return false; 216} 217 218 219void JvmtiManageCapabilities::copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to) { 220 char *ap = (char *)from; 221 char *resultp = (char *)to; 222 223 for (int i = 0; i < CAPA_SIZE; ++i) { 224 *resultp++ = *ap++; 225 } 226} 227 228 229void JvmtiManageCapabilities::get_potential_capabilities(const jvmtiCapabilities *current, 230 const jvmtiCapabilities *prohibited, 231 jvmtiCapabilities *result) { 232 // exclude prohibited capabilities, must be before adding current 233 exclude(&always_capabilities, prohibited, result); 234 235 // must include current since it may possess solo capabilities and now prohibited 236 either(result, current, result); 237 238 // add other remaining 239 either(result, &always_solo_remaining_capabilities, result); 240 241 // if this is during OnLoad more capabilities are available 242 if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) { 243 either(result, &onload_capabilities, result); 244 either(result, &onload_solo_remaining_capabilities, result); 245 } 246} 247 248jvmtiError JvmtiManageCapabilities::add_capabilities(const jvmtiCapabilities *current, 249 const jvmtiCapabilities *prohibited, 250 const jvmtiCapabilities *desired, 251 jvmtiCapabilities *result) { 252 // check that the capabilities being added are potential capabilities 253 jvmtiCapabilities temp; 254 get_potential_capabilities(current, prohibited, &temp); 255 if (has_some(exclude(desired, &temp, &temp))) { 256 return JVMTI_ERROR_NOT_AVAILABLE; 257 } 258 259 // add to the set of ever acquired capabilities 260 either(&acquired_capabilities, desired, &acquired_capabilities); 261 262 // onload capabilities that got added are now permanent - so, also remove from onload 263 both(&onload_capabilities, desired, &temp); 264 either(&always_capabilities, &temp, &always_capabilities); 265 exclude(&onload_capabilities, &temp, &onload_capabilities); 266 267 // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below) 268 both(&onload_solo_capabilities, desired, &temp); 269 either(&always_solo_capabilities, &temp, &always_solo_capabilities); 270 exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities); 271 272 // remove solo capabilities that are now taken 273 exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities); 274 exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities); 275 276 // return the result 277 either(current, desired, result); 278 279 update(); 280 281 return JVMTI_ERROR_NONE; 282} 283 284 285void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current, 286 const jvmtiCapabilities *unwanted, 287 jvmtiCapabilities *result) { 288 jvmtiCapabilities to_trash; 289 jvmtiCapabilities temp; 290 291 // can't give up what you don't have 292 both(current, unwanted, &to_trash); 293 294 // restore solo capabilities but only those that belong 295 either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp), 296 &always_solo_remaining_capabilities); 297 either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp), 298 &onload_solo_remaining_capabilities); 299 300 update(); 301 302 // return the result 303 exclude(current, unwanted, result); 304} 305 306 307void JvmtiManageCapabilities::update() { 308 jvmtiCapabilities avail; 309 310 // all capabilities 311 either(&always_capabilities, &always_solo_capabilities, &avail); 312 313 bool interp_events = 314 avail.can_generate_field_access_events || 315 avail.can_generate_field_modification_events || 316 avail.can_generate_single_step_events || 317 avail.can_generate_frame_pop_events || 318 avail.can_generate_method_entry_events || 319 avail.can_generate_method_exit_events; 320#ifdef ZERO 321 bool enter_all_methods = 322 interp_events || 323 avail.can_generate_breakpoint_events; 324 if (enter_all_methods) { 325 // Disable these when tracking the bytecodes 326 UseFastEmptyMethods = false; 327 UseFastAccessorMethods = false; 328 } 329#endif // ZERO 330 331 if (avail.can_generate_breakpoint_events) { 332 RewriteFrequentPairs = false; 333 } 334 335 // If can_redefine_classes is enabled in the onload phase then we know that the 336 // dependency information recorded by the compiler is complete. 337 if ((avail.can_redefine_classes || avail.can_retransform_classes) && 338 JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) { 339 JvmtiExport::set_all_dependencies_are_recorded(true); 340 } 341 342 JvmtiExport::set_can_get_source_debug_extension(avail.can_get_source_debug_extension); 343 JvmtiExport::set_can_maintain_original_method_order(avail.can_maintain_original_method_order); 344 JvmtiExport::set_can_post_interpreter_events(interp_events); 345 JvmtiExport::set_can_hotswap_or_post_breakpoint( 346 avail.can_generate_breakpoint_events || 347 avail.can_redefine_classes || 348 avail.can_retransform_classes); 349 JvmtiExport::set_can_modify_any_class( 350 avail.can_generate_breakpoint_events || 351 avail.can_generate_all_class_hook_events); 352 JvmtiExport::set_can_walk_any_space( 353 avail.can_tag_objects); // disable sharing in onload phase 354 // This controls whether the compilers keep extra locals live to 355 // improve the debugging experience so only set them if the selected 356 // capabilities look like a debugger. 357 JvmtiExport::set_can_access_local_variables( 358 avail.can_access_local_variables || 359 avail.can_generate_breakpoint_events || 360 avail.can_generate_frame_pop_events); 361 JvmtiExport::set_can_post_on_exceptions( 362 avail.can_generate_exception_events || 363 avail.can_generate_frame_pop_events || 364 avail.can_generate_method_exit_events); 365 JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events); 366 JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events); 367 JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events); 368 JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events); 369 JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events || 370 avail.can_generate_frame_pop_events); 371 JvmtiExport::set_can_pop_frame(avail.can_pop_frame); 372 JvmtiExport::set_can_force_early_return(avail.can_force_early_return); 373 JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events); 374} 375 376#ifndef PRODUCT 377 378void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) { 379 log_trace(jvmti)("----- capabilities -----"); 380 if (cap->can_tag_objects) 381 log_trace(jvmti)("can_tag_objects"); 382 if (cap->can_generate_field_modification_events) 383 log_trace(jvmti)("can_generate_field_modification_events"); 384 if (cap->can_generate_field_access_events) 385 log_trace(jvmti)("can_generate_field_access_events"); 386 if (cap->can_get_bytecodes) 387 log_trace(jvmti)("can_get_bytecodes"); 388 if (cap->can_get_synthetic_attribute) 389 log_trace(jvmti)("can_get_synthetic_attribute"); 390 if (cap->can_get_owned_monitor_info) 391 log_trace(jvmti)("can_get_owned_monitor_info"); 392 if (cap->can_get_current_contended_monitor) 393 log_trace(jvmti)("can_get_current_contended_monitor"); 394 if (cap->can_get_monitor_info) 395 log_trace(jvmti)("can_get_monitor_info"); 396 if (cap->can_get_constant_pool) 397 log_trace(jvmti)("can_get_constant_pool"); 398 if (cap->can_pop_frame) 399 log_trace(jvmti)("can_pop_frame"); 400 if (cap->can_force_early_return) 401 log_trace(jvmti)("can_force_early_return"); 402 if (cap->can_redefine_classes) 403 log_trace(jvmti)("can_redefine_classes"); 404 if (cap->can_retransform_classes) 405 log_trace(jvmti)("can_retransform_classes"); 406 if (cap->can_signal_thread) 407 log_trace(jvmti)("can_signal_thread"); 408 if (cap->can_get_source_file_name) 409 log_trace(jvmti)("can_get_source_file_name"); 410 if (cap->can_get_line_numbers) 411 log_trace(jvmti)("can_get_line_numbers"); 412 if (cap->can_get_source_debug_extension) 413 log_trace(jvmti)("can_get_source_debug_extension"); 414 if (cap->can_access_local_variables) 415 log_trace(jvmti)("can_access_local_variables"); 416 if (cap->can_maintain_original_method_order) 417 log_trace(jvmti)("can_maintain_original_method_order"); 418 if (cap->can_generate_single_step_events) 419 log_trace(jvmti)("can_generate_single_step_events"); 420 if (cap->can_generate_exception_events) 421 log_trace(jvmti)("can_generate_exception_events"); 422 if (cap->can_generate_frame_pop_events) 423 log_trace(jvmti)("can_generate_frame_pop_events"); 424 if (cap->can_generate_breakpoint_events) 425 log_trace(jvmti)("can_generate_breakpoint_events"); 426 if (cap->can_suspend) 427 log_trace(jvmti)("can_suspend"); 428 if (cap->can_redefine_any_class ) 429 log_trace(jvmti)("can_redefine_any_class"); 430 if (cap->can_retransform_any_class ) 431 log_trace(jvmti)("can_retransform_any_class"); 432 if (cap->can_get_current_thread_cpu_time) 433 log_trace(jvmti)("can_get_current_thread_cpu_time"); 434 if (cap->can_get_thread_cpu_time) 435 log_trace(jvmti)("can_get_thread_cpu_time"); 436 if (cap->can_generate_method_entry_events) 437 log_trace(jvmti)("can_generate_method_entry_events"); 438 if (cap->can_generate_method_exit_events) 439 log_trace(jvmti)("can_generate_method_exit_events"); 440 if (cap->can_generate_all_class_hook_events) 441 log_trace(jvmti)("can_generate_all_class_hook_events"); 442 if (cap->can_generate_compiled_method_load_events) 443 log_trace(jvmti)("can_generate_compiled_method_load_events"); 444 if (cap->can_generate_monitor_events) 445 log_trace(jvmti)("can_generate_monitor_events"); 446 if (cap->can_generate_vm_object_alloc_events) 447 log_trace(jvmti)("can_generate_vm_object_alloc_events"); 448 if (cap->can_generate_native_method_bind_events) 449 log_trace(jvmti)("can_generate_native_method_bind_events"); 450 if (cap->can_generate_garbage_collection_events) 451 log_trace(jvmti)("can_generate_garbage_collection_events"); 452 if (cap->can_generate_object_free_events) 453 log_trace(jvmti)("can_generate_object_free_events"); 454 if (cap->can_generate_resource_exhaustion_heap_events) 455 log_trace(jvmti)("can_generate_resource_exhaustion_heap_events"); 456 if (cap->can_generate_resource_exhaustion_threads_events) 457 log_trace(jvmti)("can_generate_resource_exhaustion_threads_events"); 458 if (cap->can_generate_early_vmstart) 459 log_trace(jvmti)("can_generate_early_vmstart"); 460 if (cap->can_generate_early_class_hook_events) 461 log_trace(jvmti)("can_generate_early_class_hook_events"); 462} 463 464#endif 465