| /* |
| * Copyright (c) 2003, 2016, 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 "logging/log.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 ZERO |
| jc.can_pop_frame = 1; |
| jc.can_force_early_return = 1; |
| #endif // !ZERO |
| 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_generate_early_vmstart = 1; |
| jc.can_generate_early_class_hook_events = 1; |
| 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; |
| #ifdef ZERO |
| 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; |
| } |
| #endif // ZERO |
| |
| 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) { |
| log_trace(jvmti)("----- capabilities -----"); |
| if (cap->can_tag_objects) |
| log_trace(jvmti)("can_tag_objects"); |
| if (cap->can_generate_field_modification_events) |
| log_trace(jvmti)("can_generate_field_modification_events"); |
| if (cap->can_generate_field_access_events) |
| log_trace(jvmti)("can_generate_field_access_events"); |
| if (cap->can_get_bytecodes) |
| log_trace(jvmti)("can_get_bytecodes"); |
| if (cap->can_get_synthetic_attribute) |
| log_trace(jvmti)("can_get_synthetic_attribute"); |
| if (cap->can_get_owned_monitor_info) |
| log_trace(jvmti)("can_get_owned_monitor_info"); |
| if (cap->can_get_current_contended_monitor) |
| log_trace(jvmti)("can_get_current_contended_monitor"); |
| if (cap->can_get_monitor_info) |
| log_trace(jvmti)("can_get_monitor_info"); |
| if (cap->can_get_constant_pool) |
| log_trace(jvmti)("can_get_constant_pool"); |
| if (cap->can_pop_frame) |
| log_trace(jvmti)("can_pop_frame"); |
| if (cap->can_force_early_return) |
| log_trace(jvmti)("can_force_early_return"); |
| if (cap->can_redefine_classes) |
| log_trace(jvmti)("can_redefine_classes"); |
| if (cap->can_retransform_classes) |
| log_trace(jvmti)("can_retransform_classes"); |
| if (cap->can_signal_thread) |
| log_trace(jvmti)("can_signal_thread"); |
| if (cap->can_get_source_file_name) |
| log_trace(jvmti)("can_get_source_file_name"); |
| if (cap->can_get_line_numbers) |
| log_trace(jvmti)("can_get_line_numbers"); |
| if (cap->can_get_source_debug_extension) |
| log_trace(jvmti)("can_get_source_debug_extension"); |
| if (cap->can_access_local_variables) |
| log_trace(jvmti)("can_access_local_variables"); |
| if (cap->can_maintain_original_method_order) |
| log_trace(jvmti)("can_maintain_original_method_order"); |
| if (cap->can_generate_single_step_events) |
| log_trace(jvmti)("can_generate_single_step_events"); |
| if (cap->can_generate_exception_events) |
| log_trace(jvmti)("can_generate_exception_events"); |
| if (cap->can_generate_frame_pop_events) |
| log_trace(jvmti)("can_generate_frame_pop_events"); |
| if (cap->can_generate_breakpoint_events) |
| log_trace(jvmti)("can_generate_breakpoint_events"); |
| if (cap->can_suspend) |
| log_trace(jvmti)("can_suspend"); |
| if (cap->can_redefine_any_class ) |
| log_trace(jvmti)("can_redefine_any_class"); |
| if (cap->can_retransform_any_class ) |
| log_trace(jvmti)("can_retransform_any_class"); |
| if (cap->can_get_current_thread_cpu_time) |
| log_trace(jvmti)("can_get_current_thread_cpu_time"); |
| if (cap->can_get_thread_cpu_time) |
| log_trace(jvmti)("can_get_thread_cpu_time"); |
| if (cap->can_generate_method_entry_events) |
| log_trace(jvmti)("can_generate_method_entry_events"); |
| if (cap->can_generate_method_exit_events) |
| log_trace(jvmti)("can_generate_method_exit_events"); |
| if (cap->can_generate_all_class_hook_events) |
| log_trace(jvmti)("can_generate_all_class_hook_events"); |
| if (cap->can_generate_compiled_method_load_events) |
| log_trace(jvmti)("can_generate_compiled_method_load_events"); |
| if (cap->can_generate_monitor_events) |
| log_trace(jvmti)("can_generate_monitor_events"); |
| if (cap->can_generate_vm_object_alloc_events) |
| log_trace(jvmti)("can_generate_vm_object_alloc_events"); |
| if (cap->can_generate_native_method_bind_events) |
| log_trace(jvmti)("can_generate_native_method_bind_events"); |
| if (cap->can_generate_garbage_collection_events) |
| log_trace(jvmti)("can_generate_garbage_collection_events"); |
| if (cap->can_generate_object_free_events) |
| log_trace(jvmti)("can_generate_object_free_events"); |
| if (cap->can_generate_resource_exhaustion_heap_events) |
| log_trace(jvmti)("can_generate_resource_exhaustion_heap_events"); |
| if (cap->can_generate_resource_exhaustion_threads_events) |
| log_trace(jvmti)("can_generate_resource_exhaustion_threads_events"); |
| if (cap->can_generate_early_vmstart) |
| log_trace(jvmti)("can_generate_early_vmstart"); |
| if (cap->can_generate_early_class_hook_events) |
| log_trace(jvmti)("can_generate_early_class_hook_events"); |
| } |
| |
| #endif |