--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/prims/jvmtiManageCapabilities.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,464 @@
+/*
+ * 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