1 /*
2 * Copyright (c) 2003, 2025, 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 *
39 // capabilities which are always potentially available
40 // but to only one environment
41 jvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities;
42
43 // capabilities which are potentially available during OnLoad
44 // but to only one environment
45 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities;
46
47 // remaining capabilities which are always potentially available
48 // but to only one environment
49 jvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities;
50
51 // remaining capabilities which are potentially available during OnLoad
52 // but to only one environment
53 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities;
54
55 // all capabilities ever acquired
56 jvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities;
57
58 int JvmtiManageCapabilities::_can_support_virtual_threads_count = 0;
59
60 Mutex* JvmtiManageCapabilities::_capabilities_lock = nullptr;
61
62 void JvmtiManageCapabilities::initialize() {
63 _capabilities_lock = new Mutex(Mutex::nosafepoint, "Capabilities_lock");
64 always_capabilities = init_always_capabilities();
65 onload_capabilities = init_onload_capabilities();
66 always_solo_capabilities = init_always_solo_capabilities();
67 onload_solo_capabilities = init_onload_solo_capabilities();
68 always_solo_remaining_capabilities = init_always_solo_capabilities();
69 onload_solo_remaining_capabilities = init_onload_solo_capabilities();
70 memset(&acquired_capabilities, 0, sizeof(acquired_capabilities));
71 }
72
73
74 // corresponding init functions
75 jvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() {
76 jvmtiCapabilities jc;
77
78 memset(&jc, 0, sizeof(jc));
86 jc.can_generate_all_class_hook_events = 1;
87 jc.can_generate_monitor_events = 1;
88 jc.can_generate_garbage_collection_events = 1;
89 jc.can_generate_compiled_method_load_events = 1;
90 jc.can_generate_native_method_bind_events = 1;
91 jc.can_generate_vm_object_alloc_events = 1;
92 if (os::is_thread_cpu_time_supported()) {
93 jc.can_get_current_thread_cpu_time = 1;
94 jc.can_get_thread_cpu_time = 1;
95 }
96 jc.can_redefine_classes = 1;
97 jc.can_redefine_any_class = 1;
98 jc.can_retransform_classes = 1;
99 jc.can_retransform_any_class = 1;
100 jc.can_set_native_method_prefix = 1;
101 jc.can_tag_objects = 1;
102 jc.can_generate_object_free_events = 1;
103 jc.can_generate_resource_exhaustion_heap_events = 1;
104 jc.can_generate_resource_exhaustion_threads_events = 1;
105 jc.can_support_virtual_threads = 1;
106 return jc;
107 }
108
109 jvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() {
110 jvmtiCapabilities jc;
111
112 memset(&jc, 0, sizeof(jc));
113 #ifndef ZERO
114 jc.can_pop_frame = 1;
115 jc.can_force_early_return = 1;
116 #endif // !ZERO
117 jc.can_get_source_debug_extension = 1;
118 jc.can_access_local_variables = 1;
119 jc.can_maintain_original_method_order = 1;
120 jc.can_generate_single_step_events = 1;
121 jc.can_generate_exception_events = 1;
122 jc.can_generate_frame_pop_events = 1;
123 jc.can_generate_method_entry_events = 1;
124 jc.can_generate_method_exit_events = 1;
125 jc.can_get_owned_monitor_info = 1;
260 // add to the set of ever acquired capabilities
261 either(&acquired_capabilities, desired, &acquired_capabilities);
262
263 // onload capabilities that got added are now permanent - so, also remove from onload
264 both(&onload_capabilities, desired, &temp);
265 either(&always_capabilities, &temp, &always_capabilities);
266 exclude(&onload_capabilities, &temp, &onload_capabilities);
267
268 // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below)
269 both(&onload_solo_capabilities, desired, &temp);
270 either(&always_solo_capabilities, &temp, &always_solo_capabilities);
271 exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities);
272
273 // remove solo capabilities that are now taken
274 exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities);
275 exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities);
276
277 if (desired->can_support_virtual_threads != 0 && current->can_support_virtual_threads == 0) {
278 _can_support_virtual_threads_count++;
279 }
280
281 // return the result
282 either(current, desired, result);
283
284 update();
285
286 return JVMTI_ERROR_NONE;
287 }
288
289
290 void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current,
291 const jvmtiCapabilities *unwanted,
292 jvmtiCapabilities *result) {
293 CapabilitiesMutexLocker ml;
294
295 jvmtiCapabilities to_trash;
296 jvmtiCapabilities temp;
297
298 // can't give up what you don't have
299 both(current, unwanted, &to_trash);
300
301 // restore solo capabilities but only those that belong
302 either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp),
303 &always_solo_remaining_capabilities);
304 either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp),
305 &onload_solo_remaining_capabilities);
306
307 if (to_trash.can_support_virtual_threads != 0) {
308 assert(current->can_support_virtual_threads != 0, "sanity check");
309 assert(_can_support_virtual_threads_count > 0, "sanity check");
310 _can_support_virtual_threads_count--;
311 }
312
313 update();
314
315 // return the result
316 exclude(current, unwanted, result);
317 }
318
319
320 void JvmtiManageCapabilities::update() {
321 jvmtiCapabilities avail;
322
323 // all capabilities
324 either(&always_capabilities, &always_solo_capabilities, &avail);
325
326 bool interp_events =
327 avail.can_generate_field_access_events ||
328 avail.can_generate_field_modification_events ||
329 avail.can_generate_single_step_events ||
330 avail.can_generate_method_entry_events ||
331 avail.can_generate_method_exit_events;
376 // improve the debugging experience so only set them if the selected
377 // capabilities look like a debugger.
378 JvmtiExport::set_can_access_local_variables(
379 avail.can_access_local_variables ||
380 avail.can_generate_breakpoint_events ||
381 avail.can_generate_frame_pop_events);
382 JvmtiExport::set_can_post_on_exceptions(
383 avail.can_generate_exception_events ||
384 avail.can_generate_frame_pop_events ||
385 avail.can_generate_method_exit_events);
386 JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events);
387 JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events);
388 JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events);
389 JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events);
390 JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events ||
391 avail.can_generate_frame_pop_events);
392 JvmtiExport::set_can_post_frame_pop(avail.can_generate_frame_pop_events);
393 JvmtiExport::set_can_pop_frame(avail.can_pop_frame);
394 JvmtiExport::set_can_force_early_return(avail.can_force_early_return);
395 JvmtiExport::set_can_support_virtual_threads(_can_support_virtual_threads_count != 0);
396 JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events);
397 JvmtiExport::set_can_get_owned_monitor_info(avail.can_get_owned_monitor_info ||
398 avail.can_get_owned_monitor_stack_depth_info);
399 }
400
401 #ifndef PRODUCT
402
403 void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) {
404 log_trace(jvmti)("----- capabilities -----");
405 if (cap->can_tag_objects)
406 log_trace(jvmti)("can_tag_objects");
407 if (cap->can_generate_field_modification_events)
408 log_trace(jvmti)("can_generate_field_modification_events");
409 if (cap->can_generate_field_access_events)
410 log_trace(jvmti)("can_generate_field_access_events");
411 if (cap->can_get_bytecodes)
412 log_trace(jvmti)("can_get_bytecodes");
413 if (cap->can_get_synthetic_attribute)
414 log_trace(jvmti)("can_get_synthetic_attribute");
415 if (cap->can_get_owned_monitor_info)
471 if (cap->can_generate_monitor_events)
472 log_trace(jvmti)("can_generate_monitor_events");
473 if (cap->can_generate_vm_object_alloc_events)
474 log_trace(jvmti)("can_generate_vm_object_alloc_events");
475 if (cap->can_generate_native_method_bind_events)
476 log_trace(jvmti)("can_generate_native_method_bind_events");
477 if (cap->can_generate_garbage_collection_events)
478 log_trace(jvmti)("can_generate_garbage_collection_events");
479 if (cap->can_generate_object_free_events)
480 log_trace(jvmti)("can_generate_object_free_events");
481 if (cap->can_generate_resource_exhaustion_heap_events)
482 log_trace(jvmti)("can_generate_resource_exhaustion_heap_events");
483 if (cap->can_generate_resource_exhaustion_threads_events)
484 log_trace(jvmti)("can_generate_resource_exhaustion_threads_events");
485 if (cap->can_generate_early_vmstart)
486 log_trace(jvmti)("can_generate_early_vmstart");
487 if (cap->can_generate_early_class_hook_events)
488 log_trace(jvmti)("can_generate_early_class_hook_events");
489 if (cap->can_support_virtual_threads)
490 log_trace(jvmti)("can_support_virtual_threads");
491 }
492
493 #endif
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1 /*
2 * Copyright (c) 2003, 2026, 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 *
39 // capabilities which are always potentially available
40 // but to only one environment
41 jvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities;
42
43 // capabilities which are potentially available during OnLoad
44 // but to only one environment
45 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities;
46
47 // remaining capabilities which are always potentially available
48 // but to only one environment
49 jvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities;
50
51 // remaining capabilities which are potentially available during OnLoad
52 // but to only one environment
53 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities;
54
55 // all capabilities ever acquired
56 jvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities;
57
58 int JvmtiManageCapabilities::_can_support_virtual_threads_count = 0;
59 int JvmtiManageCapabilities::_can_support_value_objects_count = 0;
60
61 Mutex* JvmtiManageCapabilities::_capabilities_lock = nullptr;
62
63 void JvmtiManageCapabilities::initialize() {
64 _capabilities_lock = new Mutex(Mutex::nosafepoint, "Capabilities_lock");
65 always_capabilities = init_always_capabilities();
66 onload_capabilities = init_onload_capabilities();
67 always_solo_capabilities = init_always_solo_capabilities();
68 onload_solo_capabilities = init_onload_solo_capabilities();
69 always_solo_remaining_capabilities = init_always_solo_capabilities();
70 onload_solo_remaining_capabilities = init_onload_solo_capabilities();
71 memset(&acquired_capabilities, 0, sizeof(acquired_capabilities));
72 }
73
74
75 // corresponding init functions
76 jvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() {
77 jvmtiCapabilities jc;
78
79 memset(&jc, 0, sizeof(jc));
87 jc.can_generate_all_class_hook_events = 1;
88 jc.can_generate_monitor_events = 1;
89 jc.can_generate_garbage_collection_events = 1;
90 jc.can_generate_compiled_method_load_events = 1;
91 jc.can_generate_native_method_bind_events = 1;
92 jc.can_generate_vm_object_alloc_events = 1;
93 if (os::is_thread_cpu_time_supported()) {
94 jc.can_get_current_thread_cpu_time = 1;
95 jc.can_get_thread_cpu_time = 1;
96 }
97 jc.can_redefine_classes = 1;
98 jc.can_redefine_any_class = 1;
99 jc.can_retransform_classes = 1;
100 jc.can_retransform_any_class = 1;
101 jc.can_set_native_method_prefix = 1;
102 jc.can_tag_objects = 1;
103 jc.can_generate_object_free_events = 1;
104 jc.can_generate_resource_exhaustion_heap_events = 1;
105 jc.can_generate_resource_exhaustion_threads_events = 1;
106 jc.can_support_virtual_threads = 1;
107 jc.can_support_value_objects = 1;
108 return jc;
109 }
110
111 jvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() {
112 jvmtiCapabilities jc;
113
114 memset(&jc, 0, sizeof(jc));
115 #ifndef ZERO
116 jc.can_pop_frame = 1;
117 jc.can_force_early_return = 1;
118 #endif // !ZERO
119 jc.can_get_source_debug_extension = 1;
120 jc.can_access_local_variables = 1;
121 jc.can_maintain_original_method_order = 1;
122 jc.can_generate_single_step_events = 1;
123 jc.can_generate_exception_events = 1;
124 jc.can_generate_frame_pop_events = 1;
125 jc.can_generate_method_entry_events = 1;
126 jc.can_generate_method_exit_events = 1;
127 jc.can_get_owned_monitor_info = 1;
262 // add to the set of ever acquired capabilities
263 either(&acquired_capabilities, desired, &acquired_capabilities);
264
265 // onload capabilities that got added are now permanent - so, also remove from onload
266 both(&onload_capabilities, desired, &temp);
267 either(&always_capabilities, &temp, &always_capabilities);
268 exclude(&onload_capabilities, &temp, &onload_capabilities);
269
270 // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below)
271 both(&onload_solo_capabilities, desired, &temp);
272 either(&always_solo_capabilities, &temp, &always_solo_capabilities);
273 exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities);
274
275 // remove solo capabilities that are now taken
276 exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities);
277 exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities);
278
279 if (desired->can_support_virtual_threads != 0 && current->can_support_virtual_threads == 0) {
280 _can_support_virtual_threads_count++;
281 }
282 if (desired->can_support_value_objects != 0 && current->can_support_value_objects == 0) {
283 _can_support_value_objects_count++;
284 }
285
286 // return the result
287 either(current, desired, result);
288
289 update();
290
291 return JVMTI_ERROR_NONE;
292 }
293
294
295 void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current,
296 const jvmtiCapabilities *unwanted,
297 jvmtiCapabilities *result) {
298 CapabilitiesMutexLocker ml;
299
300 jvmtiCapabilities to_trash;
301 jvmtiCapabilities temp;
302
303 // can't give up what you don't have
304 both(current, unwanted, &to_trash);
305
306 // restore solo capabilities but only those that belong
307 either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp),
308 &always_solo_remaining_capabilities);
309 either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp),
310 &onload_solo_remaining_capabilities);
311
312 if (to_trash.can_support_virtual_threads != 0) {
313 assert(current->can_support_virtual_threads != 0, "sanity check");
314 assert(_can_support_virtual_threads_count > 0, "sanity check");
315 _can_support_virtual_threads_count--;
316 }
317 if (to_trash.can_support_value_objects != 0) {
318 assert(current->can_support_value_objects != 0, "sanity check");
319 assert(_can_support_value_objects_count > 0, "sanity check");
320 _can_support_value_objects_count--;
321 }
322
323 update();
324
325 // return the result
326 exclude(current, unwanted, result);
327 }
328
329
330 void JvmtiManageCapabilities::update() {
331 jvmtiCapabilities avail;
332
333 // all capabilities
334 either(&always_capabilities, &always_solo_capabilities, &avail);
335
336 bool interp_events =
337 avail.can_generate_field_access_events ||
338 avail.can_generate_field_modification_events ||
339 avail.can_generate_single_step_events ||
340 avail.can_generate_method_entry_events ||
341 avail.can_generate_method_exit_events;
386 // improve the debugging experience so only set them if the selected
387 // capabilities look like a debugger.
388 JvmtiExport::set_can_access_local_variables(
389 avail.can_access_local_variables ||
390 avail.can_generate_breakpoint_events ||
391 avail.can_generate_frame_pop_events);
392 JvmtiExport::set_can_post_on_exceptions(
393 avail.can_generate_exception_events ||
394 avail.can_generate_frame_pop_events ||
395 avail.can_generate_method_exit_events);
396 JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events);
397 JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events);
398 JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events);
399 JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events);
400 JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events ||
401 avail.can_generate_frame_pop_events);
402 JvmtiExport::set_can_post_frame_pop(avail.can_generate_frame_pop_events);
403 JvmtiExport::set_can_pop_frame(avail.can_pop_frame);
404 JvmtiExport::set_can_force_early_return(avail.can_force_early_return);
405 JvmtiExport::set_can_support_virtual_threads(_can_support_virtual_threads_count != 0);
406 JvmtiExport::set_can_support_value_objects(_can_support_value_objects_count != 0);
407 JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events);
408 JvmtiExport::set_can_get_owned_monitor_info(avail.can_get_owned_monitor_info ||
409 avail.can_get_owned_monitor_stack_depth_info);
410 }
411
412 #ifndef PRODUCT
413
414 void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) {
415 log_trace(jvmti)("----- capabilities -----");
416 if (cap->can_tag_objects)
417 log_trace(jvmti)("can_tag_objects");
418 if (cap->can_generate_field_modification_events)
419 log_trace(jvmti)("can_generate_field_modification_events");
420 if (cap->can_generate_field_access_events)
421 log_trace(jvmti)("can_generate_field_access_events");
422 if (cap->can_get_bytecodes)
423 log_trace(jvmti)("can_get_bytecodes");
424 if (cap->can_get_synthetic_attribute)
425 log_trace(jvmti)("can_get_synthetic_attribute");
426 if (cap->can_get_owned_monitor_info)
482 if (cap->can_generate_monitor_events)
483 log_trace(jvmti)("can_generate_monitor_events");
484 if (cap->can_generate_vm_object_alloc_events)
485 log_trace(jvmti)("can_generate_vm_object_alloc_events");
486 if (cap->can_generate_native_method_bind_events)
487 log_trace(jvmti)("can_generate_native_method_bind_events");
488 if (cap->can_generate_garbage_collection_events)
489 log_trace(jvmti)("can_generate_garbage_collection_events");
490 if (cap->can_generate_object_free_events)
491 log_trace(jvmti)("can_generate_object_free_events");
492 if (cap->can_generate_resource_exhaustion_heap_events)
493 log_trace(jvmti)("can_generate_resource_exhaustion_heap_events");
494 if (cap->can_generate_resource_exhaustion_threads_events)
495 log_trace(jvmti)("can_generate_resource_exhaustion_threads_events");
496 if (cap->can_generate_early_vmstart)
497 log_trace(jvmti)("can_generate_early_vmstart");
498 if (cap->can_generate_early_class_hook_events)
499 log_trace(jvmti)("can_generate_early_class_hook_events");
500 if (cap->can_support_virtual_threads)
501 log_trace(jvmti)("can_support_virtual_threads");
502 if (cap->can_support_value_objects)
503 log_trace(jvmti)("can_support_value_objects");
504 }
505
506 #endif
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