1 /* 2 * Copyright (c) 2003, 2010, 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 # include "incls/_precompiled.incl" 25 # include "incls/_jvmtiManageCapabilities.cpp.incl" 26 27 static const jint CAPA_SIZE = (JVMTI_INTERNAL_CAPABILITY_COUNT + 7) / 8; 28 29 // capabilities which are always potentially available 30 jvmtiCapabilities JvmtiManageCapabilities::always_capabilities; 31 32 // capabilities which are potentially available during OnLoad 33 jvmtiCapabilities JvmtiManageCapabilities::onload_capabilities; 34 35 // capabilities which are always potentially available 36 // but to only one environment 37 jvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities; 38 39 // capabilities which are potentially available during OnLoad 40 // but to only one environment 41 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities; 42 43 // remaining capabilities which are always potentially available 44 // but to only one environment 45 jvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities; 46 47 // remaining capabilities which are potentially available during OnLoad 48 // but to only one environment 49 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities; 50 51 // all capabilities ever acquired 52 jvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities; 53 54 void JvmtiManageCapabilities::initialize() { 55 always_capabilities = init_always_capabilities(); 56 if (JvmtiEnv::get_phase() != JVMTI_PHASE_ONLOAD) { 57 recompute_always_capabilities(); 58 } 59 onload_capabilities = init_onload_capabilities(); 60 always_solo_capabilities = init_always_solo_capabilities(); 61 onload_solo_capabilities = init_onload_solo_capabilities(); 62 always_solo_remaining_capabilities = init_always_solo_capabilities(); 63 onload_solo_remaining_capabilities = init_onload_solo_capabilities(); 64 memset(&acquired_capabilities, 0, sizeof(acquired_capabilities)); 65 } 66 67 // if the capability sets are initialized in the onload phase then 68 // it happens before class data sharing (CDS) is initialized. If it 69 // turns out that CDS gets disabled then we must adjust the always 70 // capabilities. To ensure a consistent view of the capabililties 71 // anything we add here should already be in the onload set. 72 void JvmtiManageCapabilities::recompute_always_capabilities() { 73 if (!UseSharedSpaces) { 74 jvmtiCapabilities jc = always_capabilities; 75 jc.can_generate_all_class_hook_events = 1; 76 always_capabilities = jc; 77 } 78 } 79 80 81 // corresponding init functions 82 jvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() { 83 jvmtiCapabilities jc; 84 85 memset(&jc, 0, sizeof(jc)); 86 jc.can_get_bytecodes = 1; 87 jc.can_signal_thread = 1; 88 jc.can_get_source_file_name = 1; 89 jc.can_get_line_numbers = 1; 90 jc.can_get_synthetic_attribute = 1; 91 jc.can_get_monitor_info = 1; 92 jc.can_get_constant_pool = 1; 93 jc.can_generate_monitor_events = 1; 94 jc.can_generate_garbage_collection_events = 1; 95 jc.can_generate_compiled_method_load_events = 1; 96 jc.can_generate_native_method_bind_events = 1; 97 jc.can_generate_vm_object_alloc_events = 1; 98 if (os::is_thread_cpu_time_supported()) { 99 jc.can_get_current_thread_cpu_time = 1; 100 jc.can_get_thread_cpu_time = 1; 101 } 102 jc.can_redefine_classes = 1; 103 jc.can_redefine_any_class = 1; 104 jc.can_retransform_classes = 1; 105 jc.can_retransform_any_class = 1; 106 jc.can_set_native_method_prefix = 1; 107 jc.can_tag_objects = 1; 108 jc.can_generate_object_free_events = 1; 109 jc.can_generate_resource_exhaustion_heap_events = 1; 110 jc.can_generate_resource_exhaustion_threads_events = 1; 111 return jc; 112 } 113 114 jvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() { 115 jvmtiCapabilities jc; 116 117 memset(&jc, 0, sizeof(jc)); 118 #ifndef CC_INTERP 119 jc.can_pop_frame = 1; 120 jc.can_force_early_return = 1; 121 #endif // !CC_INTERP 122 jc.can_get_source_debug_extension = 1; 123 jc.can_access_local_variables = 1; 124 jc.can_maintain_original_method_order = 1; 125 jc.can_generate_all_class_hook_events = 1; 126 jc.can_generate_single_step_events = 1; 127 jc.can_generate_exception_events = 1; 128 jc.can_generate_frame_pop_events = 1; 129 jc.can_generate_method_entry_events = 1; 130 jc.can_generate_method_exit_events = 1; 131 jc.can_get_owned_monitor_info = 1; 132 jc.can_get_owned_monitor_stack_depth_info = 1; 133 jc.can_get_current_contended_monitor = 1; 134 // jc.can_get_monitor_info = 1; 135 jc.can_tag_objects = 1; // TODO: this should have been removed 136 jc.can_generate_object_free_events = 1; // TODO: this should have been removed 137 return jc; 138 } 139 140 141 jvmtiCapabilities JvmtiManageCapabilities::init_always_solo_capabilities() { 142 jvmtiCapabilities jc; 143 144 memset(&jc, 0, sizeof(jc)); 145 jc.can_suspend = 1; 146 return jc; 147 } 148 149 150 jvmtiCapabilities JvmtiManageCapabilities::init_onload_solo_capabilities() { 151 jvmtiCapabilities jc; 152 153 memset(&jc, 0, sizeof(jc)); 154 jc.can_generate_field_modification_events = 1; 155 jc.can_generate_field_access_events = 1; 156 jc.can_generate_breakpoint_events = 1; 157 return jc; 158 } 159 160 161 jvmtiCapabilities *JvmtiManageCapabilities::either(const jvmtiCapabilities *a, const jvmtiCapabilities *b, 162 jvmtiCapabilities *result) { 163 char *ap = (char *)a; 164 char *bp = (char *)b; 165 char *resultp = (char *)result; 166 167 for (int i = 0; i < CAPA_SIZE; ++i) { 168 *resultp++ = *ap++ | *bp++; 169 } 170 171 return result; 172 } 173 174 175 jvmtiCapabilities *JvmtiManageCapabilities::both(const jvmtiCapabilities *a, const jvmtiCapabilities *b, 176 jvmtiCapabilities *result) { 177 char *ap = (char *)a; 178 char *bp = (char *)b; 179 char *resultp = (char *)result; 180 181 for (int i = 0; i < CAPA_SIZE; ++i) { 182 *resultp++ = *ap++ & *bp++; 183 } 184 185 return result; 186 } 187 188 189 jvmtiCapabilities *JvmtiManageCapabilities::exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b, 190 jvmtiCapabilities *result) { 191 char *ap = (char *)a; 192 char *bp = (char *)b; 193 char *resultp = (char *)result; 194 195 for (int i = 0; i < CAPA_SIZE; ++i) { 196 *resultp++ = *ap++ & ~*bp++; 197 } 198 199 return result; 200 } 201 202 203 bool JvmtiManageCapabilities::has_some(const jvmtiCapabilities *a) { 204 char *ap = (char *)a; 205 206 for (int i = 0; i < CAPA_SIZE; ++i) { 207 if (*ap++ != 0) { 208 return true; 209 } 210 } 211 212 return false; 213 } 214 215 216 void JvmtiManageCapabilities::copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to) { 217 char *ap = (char *)from; 218 char *resultp = (char *)to; 219 220 for (int i = 0; i < CAPA_SIZE; ++i) { 221 *resultp++ = *ap++; 222 } 223 } 224 225 226 void JvmtiManageCapabilities::get_potential_capabilities(const jvmtiCapabilities *current, 227 const jvmtiCapabilities *prohibited, 228 jvmtiCapabilities *result) { 229 // exclude prohibited capabilities, must be before adding current 230 exclude(&always_capabilities, prohibited, result); 231 232 // must include current since it may possess solo capabilities and now prohibited 233 either(result, current, result); 234 235 // add other remaining 236 either(result, &always_solo_remaining_capabilities, result); 237 238 // if this is during OnLoad more capabilities are available 239 if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) { 240 either(result, &onload_capabilities, result); 241 either(result, &onload_solo_remaining_capabilities, result); 242 } 243 } 244 245 jvmtiError JvmtiManageCapabilities::add_capabilities(const jvmtiCapabilities *current, 246 const jvmtiCapabilities *prohibited, 247 const jvmtiCapabilities *desired, 248 jvmtiCapabilities *result) { 249 // check that the capabilities being added are potential capabilities 250 jvmtiCapabilities temp; 251 get_potential_capabilities(current, prohibited, &temp); 252 if (has_some(exclude(desired, &temp, &temp))) { 253 return JVMTI_ERROR_NOT_AVAILABLE; 254 } 255 256 // add to the set of ever acquired capabilities 257 either(&acquired_capabilities, desired, &acquired_capabilities); 258 259 // onload capabilities that got added are now permanent - so, also remove from onload 260 both(&onload_capabilities, desired, &temp); 261 either(&always_capabilities, &temp, &always_capabilities); 262 exclude(&onload_capabilities, &temp, &onload_capabilities); 263 264 // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below) 265 both(&onload_solo_capabilities, desired, &temp); 266 either(&always_solo_capabilities, &temp, &always_solo_capabilities); 267 exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities); 268 269 // remove solo capabilities that are now taken 270 exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities); 271 exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities); 272 273 // return the result 274 either(current, desired, result); 275 276 update(); 277 278 return JVMTI_ERROR_NONE; 279 } 280 281 282 void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current, 283 const jvmtiCapabilities *unwanted, 284 jvmtiCapabilities *result) { 285 jvmtiCapabilities to_trash; 286 jvmtiCapabilities temp; 287 288 // can't give up what you don't have 289 both(current, unwanted, &to_trash); 290 291 // restore solo capabilities but only those that belong 292 either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp), 293 &always_solo_remaining_capabilities); 294 either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp), 295 &onload_solo_remaining_capabilities); 296 297 update(); 298 299 // return the result 300 exclude(current, unwanted, result); 301 } 302 303 304 void JvmtiManageCapabilities::update() { 305 jvmtiCapabilities avail; 306 307 // all capabilities 308 either(&always_capabilities, &always_solo_capabilities, &avail); 309 310 bool interp_events = 311 avail.can_generate_field_access_events || 312 avail.can_generate_field_modification_events || 313 avail.can_generate_single_step_events || 314 avail.can_generate_frame_pop_events || 315 avail.can_generate_method_entry_events || 316 avail.can_generate_method_exit_events; 317 bool enter_all_methods = 318 interp_events || 319 avail.can_generate_breakpoint_events; 320 UseFastEmptyMethods = !enter_all_methods; 321 UseFastAccessorMethods = !enter_all_methods; 322 323 if (avail.can_generate_breakpoint_events) { 324 RewriteFrequentPairs = false; 325 } 326 327 // If can_redefine_classes is enabled in the onload phase then we know that the 328 // dependency information recorded by the compiler is complete. 329 if ((avail.can_redefine_classes || avail.can_retransform_classes) && 330 JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) { 331 JvmtiExport::set_all_dependencies_are_recorded(true); 332 } 333 334 JvmtiExport::set_can_get_source_debug_extension(avail.can_get_source_debug_extension); 335 JvmtiExport::set_can_maintain_original_method_order(avail.can_maintain_original_method_order); 336 JvmtiExport::set_can_post_interpreter_events(interp_events); 337 JvmtiExport::set_can_hotswap_or_post_breakpoint( 338 avail.can_generate_breakpoint_events || 339 avail.can_redefine_classes || 340 avail.can_retransform_classes); 341 JvmtiExport::set_can_modify_any_class( 342 avail.can_generate_breakpoint_events || 343 avail.can_generate_all_class_hook_events); 344 JvmtiExport::set_can_walk_any_space( 345 avail.can_tag_objects); // disable sharing in onload phase 346 // This controls whether the compilers keep extra locals live to 347 // improve the debugging experience so only set them if the selected 348 // capabilities look like a debugger. 349 JvmtiExport::set_can_access_local_variables( 350 avail.can_access_local_variables || 351 avail.can_generate_breakpoint_events || 352 avail.can_generate_frame_pop_events); 353 JvmtiExport::set_can_post_on_exceptions( 354 avail.can_generate_exception_events || 355 avail.can_generate_frame_pop_events || 356 avail.can_generate_method_exit_events); 357 JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events); 358 JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events); 359 JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events); 360 JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events); 361 JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events || 362 avail.can_generate_frame_pop_events); 363 JvmtiExport::set_can_pop_frame(avail.can_pop_frame); 364 JvmtiExport::set_can_force_early_return(avail.can_force_early_return); 365 JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events); 366 } 367 368 #ifndef PRODUCT 369 370 void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) { 371 tty->print_cr("----- capabilities -----"); 372 if (cap->can_tag_objects) 373 tty->print_cr("can_tag_objects"); 374 if (cap->can_generate_field_modification_events) 375 tty->print_cr("can_generate_field_modification_events"); 376 if (cap->can_generate_field_access_events) 377 tty->print_cr("can_generate_field_access_events"); 378 if (cap->can_get_bytecodes) 379 tty->print_cr("can_get_bytecodes"); 380 if (cap->can_get_synthetic_attribute) 381 tty->print_cr("can_get_synthetic_attribute"); 382 if (cap->can_get_owned_monitor_info) 383 tty->print_cr("can_get_owned_monitor_info"); 384 if (cap->can_get_current_contended_monitor) 385 tty->print_cr("can_get_current_contended_monitor"); 386 if (cap->can_get_monitor_info) 387 tty->print_cr("can_get_monitor_info"); 388 if (cap->can_get_constant_pool) 389 tty->print_cr("can_get_constant_pool"); 390 if (cap->can_pop_frame) 391 tty->print_cr("can_pop_frame"); 392 if (cap->can_force_early_return) 393 tty->print_cr("can_force_early_return"); 394 if (cap->can_redefine_classes) 395 tty->print_cr("can_redefine_classes"); 396 if (cap->can_retransform_classes) 397 tty->print_cr("can_retransform_classes"); 398 if (cap->can_signal_thread) 399 tty->print_cr("can_signal_thread"); 400 if (cap->can_get_source_file_name) 401 tty->print_cr("can_get_source_file_name"); 402 if (cap->can_get_line_numbers) 403 tty->print_cr("can_get_line_numbers"); 404 if (cap->can_get_source_debug_extension) 405 tty->print_cr("can_get_source_debug_extension"); 406 if (cap->can_access_local_variables) 407 tty->print_cr("can_access_local_variables"); 408 if (cap->can_maintain_original_method_order) 409 tty->print_cr("can_maintain_original_method_order"); 410 if (cap->can_generate_single_step_events) 411 tty->print_cr("can_generate_single_step_events"); 412 if (cap->can_generate_exception_events) 413 tty->print_cr("can_generate_exception_events"); 414 if (cap->can_generate_frame_pop_events) 415 tty->print_cr("can_generate_frame_pop_events"); 416 if (cap->can_generate_breakpoint_events) 417 tty->print_cr("can_generate_breakpoint_events"); 418 if (cap->can_suspend) 419 tty->print_cr("can_suspend"); 420 if (cap->can_redefine_any_class ) 421 tty->print_cr("can_redefine_any_class"); 422 if (cap->can_retransform_any_class ) 423 tty->print_cr("can_retransform_any_class"); 424 if (cap->can_get_current_thread_cpu_time) 425 tty->print_cr("can_get_current_thread_cpu_time"); 426 if (cap->can_get_thread_cpu_time) 427 tty->print_cr("can_get_thread_cpu_time"); 428 if (cap->can_generate_method_entry_events) 429 tty->print_cr("can_generate_method_entry_events"); 430 if (cap->can_generate_method_exit_events) 431 tty->print_cr("can_generate_method_exit_events"); 432 if (cap->can_generate_all_class_hook_events) 433 tty->print_cr("can_generate_all_class_hook_events"); 434 if (cap->can_generate_compiled_method_load_events) 435 tty->print_cr("can_generate_compiled_method_load_events"); 436 if (cap->can_generate_monitor_events) 437 tty->print_cr("can_generate_monitor_events"); 438 if (cap->can_generate_vm_object_alloc_events) 439 tty->print_cr("can_generate_vm_object_alloc_events"); 440 if (cap->can_generate_native_method_bind_events) 441 tty->print_cr("can_generate_native_method_bind_events"); 442 if (cap->can_generate_garbage_collection_events) 443 tty->print_cr("can_generate_garbage_collection_events"); 444 if (cap->can_generate_object_free_events) 445 tty->print_cr("can_generate_object_free_events"); 446 if (cap->can_generate_resource_exhaustion_heap_events) 447 tty->print_cr("can_generate_resource_exhaustion_heap_events"); 448 if (cap->can_generate_resource_exhaustion_threads_events) 449 tty->print_cr("can_generate_resource_exhaustion_threads_events"); 450 } 451 452 #endif