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2649 lines
90 KiB
C++
2649 lines
90 KiB
C++
/*
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* Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "classfile/classLoaderDataGraph.hpp"
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#include "classfile/javaClasses.inline.hpp"
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#include "classfile/moduleEntry.hpp"
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#include "classfile/symbolTable.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "jvmtifiles/jvmtiEnv.hpp"
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#include "memory/iterator.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/klass.inline.hpp"
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#include "oops/objArrayKlass.hpp"
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#include "oops/objArrayOop.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/oopHandle.inline.hpp"
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#include "prims/jvmtiEnvBase.hpp"
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#include "prims/jvmtiEventController.inline.hpp"
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#include "prims/jvmtiExtensions.hpp"
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#include "prims/jvmtiImpl.hpp"
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#include "prims/jvmtiManageCapabilities.hpp"
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#include "prims/jvmtiTagMap.hpp"
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#include "prims/jvmtiThreadState.inline.hpp"
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#include "runtime/continuationEntry.inline.hpp"
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#include "runtime/deoptimization.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/javaThread.inline.hpp"
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#include "runtime/jfieldIDWorkaround.hpp"
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#include "runtime/jniHandles.inline.hpp"
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#include "runtime/objectMonitor.inline.hpp"
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#include "runtime/osThread.hpp"
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#include "runtime/signature.hpp"
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#include "runtime/stackWatermarkSet.inline.hpp"
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#include "runtime/threads.hpp"
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#include "runtime/threadSMR.inline.hpp"
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#include "runtime/vframe.inline.hpp"
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#include "runtime/vframe_hp.hpp"
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#include "runtime/vmThread.hpp"
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#include "runtime/vmOperations.hpp"
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#include "services/threadService.hpp"
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///////////////////////////////////////////////////////////////
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//
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// JvmtiEnvBase
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//
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JvmtiEnvBase* JvmtiEnvBase::_head_environment = nullptr;
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bool JvmtiEnvBase::_globally_initialized = false;
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volatile bool JvmtiEnvBase::_needs_clean_up = false;
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jvmtiPhase JvmtiEnvBase::_phase = JVMTI_PHASE_PRIMORDIAL;
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volatile int JvmtiEnvBase::_dying_thread_env_iteration_count = 0;
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extern jvmtiInterface_1_ jvmti_Interface;
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extern jvmtiInterface_1_ jvmtiTrace_Interface;
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// perform initializations that must occur before any JVMTI environments
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// are released but which should only be initialized once (no matter
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// how many environments are created).
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void
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JvmtiEnvBase::globally_initialize() {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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assert(_globally_initialized == false, "bad call");
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JvmtiManageCapabilities::initialize();
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// register extension functions and events
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JvmtiExtensions::register_extensions();
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#ifdef JVMTI_TRACE
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JvmtiTrace::initialize();
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#endif
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_globally_initialized = true;
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}
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void
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JvmtiEnvBase::initialize() {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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// Add this environment to the end of the environment list (order is important)
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{
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// This block of code must not contain any safepoints, as list deallocation
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// (which occurs at a safepoint) cannot occur simultaneously with this list
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// addition. Note: NoSafepointVerifier cannot, currently, be used before
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// threads exist.
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JvmtiEnvIterator it;
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JvmtiEnvBase *previous_env = nullptr;
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for (JvmtiEnvBase* env = it.first(); env != nullptr; env = it.next(env)) {
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previous_env = env;
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}
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if (previous_env == nullptr) {
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_head_environment = this;
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} else {
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previous_env->set_next_environment(this);
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}
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}
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if (_globally_initialized == false) {
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globally_initialize();
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}
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}
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jvmtiPhase
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JvmtiEnvBase::phase() {
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// For the JVMTI environments possessed the can_generate_early_vmstart:
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// replace JVMTI_PHASE_PRIMORDIAL with JVMTI_PHASE_START
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if (_phase == JVMTI_PHASE_PRIMORDIAL &&
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JvmtiExport::early_vmstart_recorded() &&
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early_vmstart_env()) {
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return JVMTI_PHASE_START;
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}
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return _phase; // Normal case
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}
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bool
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JvmtiEnvBase::is_valid() {
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jlong value = 0;
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// This object might not be a JvmtiEnvBase so we can't assume
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// the _magic field is properly aligned. Get the value in a safe
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// way and then check against JVMTI_MAGIC.
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switch (sizeof(_magic)) {
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case 2:
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value = Bytes::get_native_u2((address)&_magic);
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break;
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case 4:
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value = Bytes::get_native_u4((address)&_magic);
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break;
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case 8:
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value = Bytes::get_native_u8((address)&_magic);
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break;
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default:
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guarantee(false, "_magic field is an unexpected size");
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}
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return value == JVMTI_MAGIC;
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}
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bool
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JvmtiEnvBase::use_version_1_0_semantics() {
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int major, minor, micro;
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JvmtiExport::decode_version_values(_version, &major, &minor, µ);
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return major == 1 && minor == 0; // micro version doesn't matter here
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}
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bool
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JvmtiEnvBase::use_version_1_1_semantics() {
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int major, minor, micro;
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JvmtiExport::decode_version_values(_version, &major, &minor, µ);
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return major == 1 && minor == 1; // micro version doesn't matter here
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}
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bool
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JvmtiEnvBase::use_version_1_2_semantics() {
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int major, minor, micro;
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JvmtiExport::decode_version_values(_version, &major, &minor, µ);
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return major == 1 && minor == 2; // micro version doesn't matter here
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}
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JvmtiEnvBase::JvmtiEnvBase(jint version) : _env_event_enable() {
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_version = version;
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_env_local_storage = nullptr;
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_tag_map = nullptr;
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_native_method_prefix_count = 0;
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_native_method_prefixes = nullptr;
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_next = nullptr;
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_class_file_load_hook_ever_enabled = false;
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// Moot since ClassFileLoadHook not yet enabled.
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// But "true" will give a more predictable ClassFileLoadHook behavior
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// for environment creation during ClassFileLoadHook.
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_is_retransformable = true;
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// all callbacks initially null
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memset(&_event_callbacks, 0, sizeof(jvmtiEventCallbacks));
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memset(&_ext_event_callbacks, 0, sizeof(jvmtiExtEventCallbacks));
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// all capabilities initially off
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memset(&_current_capabilities, 0, sizeof(_current_capabilities));
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// all prohibited capabilities initially off
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memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities));
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_magic = JVMTI_MAGIC;
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JvmtiEventController::env_initialize((JvmtiEnv*)this);
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#ifdef JVMTI_TRACE
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_jvmti_external.functions = TraceJVMTI != nullptr ? &jvmtiTrace_Interface : &jvmti_Interface;
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#else
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_jvmti_external.functions = &jvmti_Interface;
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#endif
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}
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void
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JvmtiEnvBase::dispose() {
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#ifdef JVMTI_TRACE
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JvmtiTrace::shutdown();
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#endif
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// Dispose of event info and let the event controller call us back
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// in a locked state (env_dispose, below)
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JvmtiEventController::env_dispose(this);
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}
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void
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JvmtiEnvBase::env_dispose() {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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// We have been entered with all events disabled on this environment.
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// A race to re-enable events (by setting callbacks) is prevented by
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// checking for a valid environment when setting callbacks (while
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// holding the JvmtiThreadState_lock).
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// Mark as invalid.
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_magic = DISPOSED_MAGIC;
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// Relinquish all capabilities.
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jvmtiCapabilities *caps = get_capabilities();
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JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps);
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// Same situation as with events (see above)
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set_native_method_prefixes(0, nullptr);
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JvmtiTagMap* tag_map_to_clear = tag_map_acquire();
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// A tag map can be big, clear it now to save memory until
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// the destructor runs.
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if (tag_map_to_clear != nullptr) {
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tag_map_to_clear->clear();
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}
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_needs_clean_up = true;
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}
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JvmtiEnvBase::~JvmtiEnvBase() {
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assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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// There is a small window of time during which the tag map of a
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// disposed environment could have been reallocated.
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// Make sure it is gone.
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JvmtiTagMap* tag_map_to_deallocate = _tag_map;
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set_tag_map(nullptr);
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// A tag map can be big, deallocate it now
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if (tag_map_to_deallocate != nullptr) {
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delete tag_map_to_deallocate;
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}
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_magic = BAD_MAGIC;
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}
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void
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JvmtiEnvBase::periodic_clean_up() {
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assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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// JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So
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// clean up JvmtiThreadState before deleting JvmtiEnv pointer.
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JvmtiThreadState::periodic_clean_up();
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// Unlink all invalid environments from the list of environments
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// and deallocate them
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JvmtiEnvIterator it;
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JvmtiEnvBase* previous_env = nullptr;
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JvmtiEnvBase* env = it.first();
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while (env != nullptr) {
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if (env->is_valid()) {
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previous_env = env;
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env = it.next(env);
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} else {
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// This one isn't valid, remove it from the list and deallocate it
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JvmtiEnvBase* defunct_env = env;
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env = it.next(env);
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if (previous_env == nullptr) {
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_head_environment = env;
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} else {
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previous_env->set_next_environment(env);
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}
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delete defunct_env;
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}
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}
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}
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void
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JvmtiEnvBase::check_for_periodic_clean_up() {
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assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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class ThreadInsideIterationClosure: public ThreadClosure {
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private:
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bool _inside;
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public:
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ThreadInsideIterationClosure() : _inside(false) {};
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void do_thread(Thread* thread) {
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_inside |= thread->is_inside_jvmti_env_iteration();
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}
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bool is_inside_jvmti_env_iteration() {
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return _inside;
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}
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};
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if (_needs_clean_up) {
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// Check if we are currently iterating environment,
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// deallocation should not occur if we are
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ThreadInsideIterationClosure tiic;
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Threads::threads_do(&tiic);
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if (!tiic.is_inside_jvmti_env_iteration() &&
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!is_inside_dying_thread_env_iteration()) {
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_needs_clean_up = false;
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JvmtiEnvBase::periodic_clean_up();
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}
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}
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}
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void
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JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(),
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"sanity check");
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if (!_class_file_load_hook_ever_enabled) {
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_class_file_load_hook_ever_enabled = true;
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if (get_capabilities()->can_retransform_classes) {
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_is_retransformable = true;
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} else {
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_is_retransformable = false;
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// cannot add retransform capability after ClassFileLoadHook has been enabled
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get_prohibited_capabilities()->can_retransform_classes = 1;
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}
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}
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}
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void
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JvmtiEnvBase::record_class_file_load_hook_enabled() {
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if (!_class_file_load_hook_ever_enabled) {
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if (Threads::number_of_threads() == 0) {
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record_first_time_class_file_load_hook_enabled();
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} else {
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MutexLocker mu(JvmtiThreadState_lock);
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record_first_time_class_file_load_hook_enabled();
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}
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}
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}
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jvmtiError
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JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(),
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"sanity check");
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int old_prefix_count = get_native_method_prefix_count();
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char **old_prefixes = get_native_method_prefixes();
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// allocate and install the new prefixex
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if (prefix_count == 0 || !is_valid()) {
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_native_method_prefix_count = 0;
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_native_method_prefixes = nullptr;
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} else {
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// there are prefixes, allocate an array to hold them, and fill it
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char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*), mtInternal);
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if (new_prefixes == nullptr) {
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return JVMTI_ERROR_OUT_OF_MEMORY;
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}
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for (int i = 0; i < prefix_count; i++) {
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char* prefix = prefixes[i];
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if (prefix == nullptr) {
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for (int j = 0; j < (i-1); j++) {
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os::free(new_prefixes[j]);
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}
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os::free(new_prefixes);
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return JVMTI_ERROR_NULL_POINTER;
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}
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prefix = os::strdup(prefixes[i]);
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if (prefix == nullptr) {
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for (int j = 0; j < (i-1); j++) {
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os::free(new_prefixes[j]);
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}
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os::free(new_prefixes);
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return JVMTI_ERROR_OUT_OF_MEMORY;
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}
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new_prefixes[i] = prefix;
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}
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_native_method_prefix_count = prefix_count;
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_native_method_prefixes = new_prefixes;
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}
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// now that we know the new prefixes have been successfully installed we can
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// safely remove the old ones
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if (old_prefix_count != 0) {
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for (int i = 0; i < old_prefix_count; i++) {
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os::free(old_prefixes[i]);
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}
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os::free(old_prefixes);
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}
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return JVMTI_ERROR_NONE;
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}
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// Collect all the prefixes which have been set in any JVM TI environments
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// by the SetNativeMethodPrefix(es) functions. Be sure to maintain the
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// order of environments and the order of prefixes within each environment.
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// Return in a resource allocated array.
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char**
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JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) {
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assert(Threads::number_of_threads() == 0 ||
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SafepointSynchronize::is_at_safepoint() ||
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JvmtiThreadState_lock->is_locked(),
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"sanity check");
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int total_count = 0;
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GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5);
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JvmtiEnvIterator it;
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for (JvmtiEnvBase* env = it.first(); env != nullptr; env = it.next(env)) {
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int prefix_count = env->get_native_method_prefix_count();
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char** prefixes = env->get_native_method_prefixes();
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for (int j = 0; j < prefix_count; j++) {
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// retrieve a prefix and so that it is safe against asynchronous changes
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// copy it into the resource area
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char* prefix = prefixes[j];
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char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1);
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strcpy(prefix_copy, prefix);
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prefix_array->at_put_grow(total_count++, prefix_copy);
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}
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}
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char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count);
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char** p = all_prefixes;
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for (int i = 0; i < total_count; ++i) {
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*p++ = prefix_array->at(i);
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}
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*count_ptr = total_count;
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return all_prefixes;
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}
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void
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JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks,
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jint size_of_callbacks) {
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assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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size_t byte_cnt = sizeof(jvmtiEventCallbacks);
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// clear in either case to be sure we got any gap between sizes
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memset(&_event_callbacks, 0, byte_cnt);
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// Now that JvmtiThreadState_lock is held, prevent a possible race condition where events
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// are re-enabled by a call to set event callbacks where the DisposeEnvironment
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// occurs after the boiler-plate environment check and before the lock is acquired.
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if (callbacks != nullptr && is_valid()) {
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if (size_of_callbacks < (jint)byte_cnt) {
|
|
byte_cnt = size_of_callbacks;
|
|
}
|
|
memcpy(&_event_callbacks, callbacks, byte_cnt);
|
|
}
|
|
}
|
|
|
|
|
|
// In the fullness of time, all users of the method should instead
|
|
// directly use allocate, besides being cleaner and faster, this will
|
|
// mean much better out of memory handling
|
|
unsigned char *
|
|
JvmtiEnvBase::jvmtiMalloc(jlong size) {
|
|
unsigned char* mem = nullptr;
|
|
jvmtiError result = allocate(size, &mem);
|
|
assert(result == JVMTI_ERROR_NONE, "Allocate failed");
|
|
return mem;
|
|
}
|
|
|
|
|
|
// Handle management
|
|
|
|
jobject JvmtiEnvBase::jni_reference(Handle hndl) {
|
|
return JNIHandles::make_local(hndl());
|
|
}
|
|
|
|
jobject JvmtiEnvBase::jni_reference(JavaThread *thread, Handle hndl) {
|
|
return JNIHandles::make_local(thread, hndl());
|
|
}
|
|
|
|
void JvmtiEnvBase::destroy_jni_reference(jobject jobj) {
|
|
JNIHandles::destroy_local(jobj);
|
|
}
|
|
|
|
void JvmtiEnvBase::destroy_jni_reference(JavaThread *thread, jobject jobj) {
|
|
JNIHandles::destroy_local(jobj); // thread is unused.
|
|
}
|
|
|
|
//
|
|
// Threads
|
|
//
|
|
|
|
jthread *
|
|
JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) {
|
|
if (length == 0) {
|
|
return nullptr;
|
|
}
|
|
|
|
jthread* objArray = (jthread *) jvmtiMalloc(sizeof(jthread) * length);
|
|
NULL_CHECK(objArray, nullptr);
|
|
|
|
for (int i = 0; i < length; i++) {
|
|
objArray[i] = (jthread)jni_reference(handles[i]);
|
|
}
|
|
return objArray;
|
|
}
|
|
|
|
jthreadGroup *
|
|
JvmtiEnvBase::new_jthreadGroupArray(int length, objArrayHandle groups) {
|
|
if (length == 0) {
|
|
return nullptr;
|
|
}
|
|
|
|
jthreadGroup* objArray = (jthreadGroup *) jvmtiMalloc(sizeof(jthreadGroup) * length);
|
|
NULL_CHECK(objArray, nullptr);
|
|
|
|
for (int i = 0; i < length; i++) {
|
|
objArray[i] = (jthreadGroup)JNIHandles::make_local(groups->obj_at(i));
|
|
}
|
|
return objArray;
|
|
}
|
|
|
|
// Return the vframe on the specified thread and depth, null if no such frame.
|
|
// The thread and the oops in the returned vframe might not have been processed.
|
|
javaVFrame*
|
|
JvmtiEnvBase::jvf_for_thread_and_depth(JavaThread* java_thread, jint depth) {
|
|
if (!java_thread->has_last_Java_frame()) {
|
|
return nullptr;
|
|
}
|
|
RegisterMap reg_map(java_thread,
|
|
RegisterMap::UpdateMap::include,
|
|
RegisterMap::ProcessFrames::skip,
|
|
RegisterMap::WalkContinuation::include);
|
|
javaVFrame *jvf = java_thread->last_java_vframe(®_map);
|
|
|
|
jvf = JvmtiEnvBase::check_and_skip_hidden_frames(java_thread, jvf);
|
|
|
|
for (int d = 0; jvf != nullptr && d < depth; d++) {
|
|
jvf = jvf->java_sender();
|
|
}
|
|
return jvf;
|
|
}
|
|
|
|
//
|
|
// utilities: JNI objects
|
|
//
|
|
|
|
|
|
jclass
|
|
JvmtiEnvBase::get_jni_class_non_null(Klass* k) {
|
|
assert(k != nullptr, "k != null");
|
|
Thread *thread = Thread::current();
|
|
return (jclass)jni_reference(Handle(thread, k->java_mirror()));
|
|
}
|
|
|
|
//
|
|
// Field Information
|
|
//
|
|
|
|
bool
|
|
JvmtiEnvBase::get_field_descriptor(Klass* k, jfieldID field, fieldDescriptor* fd) {
|
|
if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) {
|
|
return false;
|
|
}
|
|
bool found = false;
|
|
if (jfieldIDWorkaround::is_static_jfieldID(field)) {
|
|
JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field);
|
|
found = id->find_local_field(fd);
|
|
} else {
|
|
// Non-static field. The fieldID is really the offset of the field within the object.
|
|
int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field);
|
|
found = InstanceKlass::cast(k)->find_field_from_offset(offset, false, fd);
|
|
}
|
|
return found;
|
|
}
|
|
|
|
bool
|
|
JvmtiEnvBase::is_vthread_alive(oop vt) {
|
|
oop cont = java_lang_VirtualThread::continuation(vt);
|
|
return !jdk_internal_vm_Continuation::done(cont) &&
|
|
java_lang_VirtualThread::state(vt) != java_lang_VirtualThread::NEW;
|
|
}
|
|
|
|
// Return JavaThread if virtual thread is mounted, null otherwise.
|
|
JavaThread* JvmtiEnvBase::get_JavaThread_or_null(oop vthread) {
|
|
oop carrier_thread = java_lang_VirtualThread::carrier_thread(vthread);
|
|
if (carrier_thread == nullptr) {
|
|
return nullptr;
|
|
}
|
|
|
|
JavaThread* java_thread = java_lang_Thread::thread(carrier_thread);
|
|
|
|
// This could be a different thread to the current one. So we need to ensure that
|
|
// processing has started before we are allowed to read the continuation oop of
|
|
// another thread, as it is a direct root of that other thread.
|
|
StackWatermarkSet::start_processing(java_thread, StackWatermarkKind::gc);
|
|
|
|
oop cont = java_lang_VirtualThread::continuation(vthread);
|
|
assert(cont != nullptr, "must be");
|
|
assert(Continuation::continuation_scope(cont) == java_lang_VirtualThread::vthread_scope(), "must be");
|
|
return Continuation::is_continuation_mounted(java_thread, cont) ? java_thread : nullptr;
|
|
}
|
|
|
|
javaVFrame*
|
|
JvmtiEnvBase::check_and_skip_hidden_frames(bool is_in_VTMS_transition, javaVFrame* jvf) {
|
|
// The second condition is needed to hide notification methods.
|
|
if (!is_in_VTMS_transition && (jvf == nullptr || !jvf->method()->jvmti_mount_transition())) {
|
|
return jvf; // No frames to skip.
|
|
}
|
|
// Find jvf with a method annotated with @JvmtiMountTransition.
|
|
for ( ; jvf != nullptr; jvf = jvf->java_sender()) {
|
|
if (jvf->method()->jvmti_mount_transition()) { // Cannot actually appear in an unmounted continuation; they're never frozen.
|
|
jvf = jvf->java_sender(); // Skip annotated method.
|
|
break;
|
|
}
|
|
if (jvf->method()->changes_current_thread()) {
|
|
break;
|
|
}
|
|
// Skip frame above annotated method.
|
|
}
|
|
return jvf;
|
|
}
|
|
|
|
javaVFrame*
|
|
JvmtiEnvBase::check_and_skip_hidden_frames(JavaThread* jt, javaVFrame* jvf) {
|
|
jvf = check_and_skip_hidden_frames(jt->is_in_VTMS_transition(), jvf);
|
|
return jvf;
|
|
}
|
|
|
|
javaVFrame*
|
|
JvmtiEnvBase::check_and_skip_hidden_frames(oop vthread, javaVFrame* jvf) {
|
|
JvmtiThreadState* state = java_lang_Thread::jvmti_thread_state(vthread);
|
|
if (state == nullptr) {
|
|
// nothing to skip
|
|
return jvf;
|
|
}
|
|
jvf = check_and_skip_hidden_frames(java_lang_Thread::is_in_VTMS_transition(vthread), jvf);
|
|
return jvf;
|
|
}
|
|
|
|
javaVFrame*
|
|
JvmtiEnvBase::get_vthread_jvf(oop vthread) {
|
|
assert(java_lang_VirtualThread::state(vthread) != java_lang_VirtualThread::NEW, "sanity check");
|
|
assert(java_lang_VirtualThread::state(vthread) != java_lang_VirtualThread::TERMINATED, "sanity check");
|
|
|
|
Thread* cur_thread = Thread::current();
|
|
oop cont = java_lang_VirtualThread::continuation(vthread);
|
|
javaVFrame* jvf = nullptr;
|
|
|
|
JavaThread* java_thread = get_JavaThread_or_null(vthread);
|
|
if (java_thread != nullptr) {
|
|
if (!java_thread->has_last_Java_frame()) {
|
|
// TBD: This is a temporary work around to avoid a guarantee caused by
|
|
// the native enterSpecial frame on the top. No frames will be found
|
|
// by the JVMTI functions such as GetStackTrace.
|
|
return nullptr;
|
|
}
|
|
vframeStream vfs(java_thread);
|
|
jvf = vfs.at_end() ? nullptr : vfs.asJavaVFrame();
|
|
jvf = check_and_skip_hidden_frames(java_thread, jvf);
|
|
} else {
|
|
vframeStream vfs(cont);
|
|
jvf = vfs.at_end() ? nullptr : vfs.asJavaVFrame();
|
|
jvf = check_and_skip_hidden_frames(vthread, jvf);
|
|
}
|
|
return jvf;
|
|
}
|
|
|
|
// Return correct javaVFrame for a carrier (non-virtual) thread.
|
|
// It strips vthread frames at the top if there are any.
|
|
javaVFrame*
|
|
JvmtiEnvBase::get_cthread_last_java_vframe(JavaThread* jt, RegisterMap* reg_map_p) {
|
|
// Strip vthread frames in case of carrier thread with mounted continuation.
|
|
bool cthread_with_cont = JvmtiEnvBase::is_cthread_with_continuation(jt);
|
|
javaVFrame *jvf = cthread_with_cont ? jt->carrier_last_java_vframe(reg_map_p)
|
|
: jt->last_java_vframe(reg_map_p);
|
|
// Skip hidden frames only for carrier threads
|
|
// which are in non-temporary VTMS transition.
|
|
if (jt->is_in_VTMS_transition()) {
|
|
jvf = check_and_skip_hidden_frames(jt, jvf);
|
|
}
|
|
return jvf;
|
|
}
|
|
|
|
jint
|
|
JvmtiEnvBase::get_thread_state_base(oop thread_oop, JavaThread* jt) {
|
|
jint state = 0;
|
|
|
|
if (thread_oop != nullptr) {
|
|
// Get most state bits.
|
|
state = (jint)java_lang_Thread::get_thread_status(thread_oop);
|
|
}
|
|
if (jt != nullptr) {
|
|
// We have a JavaThread* so add more state bits.
|
|
JavaThreadState jts = jt->thread_state();
|
|
|
|
if (jt->is_carrier_thread_suspended() ||
|
|
((jt->jvmti_vthread() == nullptr || jt->jvmti_vthread() == thread_oop) && jt->is_suspended())) {
|
|
// Suspended non-virtual thread.
|
|
state |= JVMTI_THREAD_STATE_SUSPENDED;
|
|
}
|
|
if (jts == _thread_in_native) {
|
|
state |= JVMTI_THREAD_STATE_IN_NATIVE;
|
|
}
|
|
if (jt->is_interrupted(false)) {
|
|
state |= JVMTI_THREAD_STATE_INTERRUPTED;
|
|
}
|
|
}
|
|
return state;
|
|
}
|
|
|
|
jint
|
|
JvmtiEnvBase::get_thread_state(oop thread_oop, JavaThread* jt) {
|
|
jint state = 0;
|
|
|
|
if (is_thread_carrying_vthread(jt, thread_oop)) {
|
|
state = (jint)java_lang_Thread::get_thread_status(thread_oop);
|
|
|
|
// This is for extra safety. Other bits are not expected nor needed.
|
|
state &= (JVMTI_THREAD_STATE_ALIVE | JVMTI_THREAD_STATE_INTERRUPTED);
|
|
|
|
if (jt->is_carrier_thread_suspended()) {
|
|
state |= JVMTI_THREAD_STATE_SUSPENDED;
|
|
}
|
|
// It's okay for the JVMTI state to be reported as WAITING when waiting
|
|
// for something other than an Object.wait. So, we treat a thread carrying
|
|
// a virtual thread as waiting indefinitely which is not runnable.
|
|
// It is why the RUNNABLE bit is not needed and the WAITING bits are added.
|
|
state |= JVMTI_THREAD_STATE_WAITING | JVMTI_THREAD_STATE_WAITING_INDEFINITELY;
|
|
} else {
|
|
state = get_thread_state_base(thread_oop, jt);
|
|
}
|
|
return state;
|
|
}
|
|
|
|
jint
|
|
JvmtiEnvBase::get_vthread_state(oop thread_oop, JavaThread* java_thread) {
|
|
jint state = 0;
|
|
bool ext_suspended = JvmtiVTSuspender::is_vthread_suspended(thread_oop);
|
|
jint interrupted = java_lang_Thread::interrupted(thread_oop);
|
|
|
|
if (java_thread != nullptr) {
|
|
// If virtual thread is blocked on a monitor enter the BLOCKED_ON_MONITOR_ENTER bit
|
|
// is set for carrier thread instead of virtual.
|
|
// Other state bits except filtered ones are expected to be the same.
|
|
oop ct_oop = java_lang_VirtualThread::carrier_thread(thread_oop);
|
|
jint filtered_bits = JVMTI_THREAD_STATE_SUSPENDED | JVMTI_THREAD_STATE_INTERRUPTED;
|
|
|
|
// This call can trigger a safepoint, so thread_oop must not be used after it.
|
|
state = get_thread_state_base(ct_oop, java_thread) & ~filtered_bits;
|
|
} else {
|
|
int vt_state = java_lang_VirtualThread::state(thread_oop);
|
|
state = (jint)java_lang_VirtualThread::map_state_to_thread_status(vt_state);
|
|
}
|
|
// Ensure the thread has not exited after retrieving suspended/interrupted values.
|
|
if ((state & JVMTI_THREAD_STATE_ALIVE) != 0) {
|
|
if (ext_suspended) {
|
|
state |= JVMTI_THREAD_STATE_SUSPENDED;
|
|
}
|
|
if (interrupted) {
|
|
state |= JVMTI_THREAD_STATE_INTERRUPTED;
|
|
}
|
|
}
|
|
return state;
|
|
}
|
|
|
|
jint
|
|
JvmtiEnvBase::get_thread_or_vthread_state(oop thread_oop, JavaThread* java_thread) {
|
|
jint state = 0;
|
|
if (java_lang_VirtualThread::is_instance(thread_oop)) {
|
|
state = JvmtiEnvBase::get_vthread_state(thread_oop, java_thread);
|
|
} else {
|
|
state = JvmtiEnvBase::get_thread_state(thread_oop, java_thread);
|
|
}
|
|
return state;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_live_threads(JavaThread* current_thread, Handle group_hdl, jint *count_ptr, Handle **thread_objs_p) {
|
|
jint count = 0;
|
|
Handle *thread_objs = nullptr;
|
|
ThreadsListEnumerator tle(current_thread, /* include_jvmti_agent_threads */ true);
|
|
int nthreads = tle.num_threads();
|
|
if (nthreads > 0) {
|
|
thread_objs = NEW_RESOURCE_ARRAY_RETURN_NULL(Handle, nthreads);
|
|
NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
|
|
for (int i = 0; i < nthreads; i++) {
|
|
Handle thread = tle.get_threadObj(i);
|
|
if (thread()->is_a(vmClasses::Thread_klass()) && java_lang_Thread::threadGroup(thread()) == group_hdl()) {
|
|
thread_objs[count++] = thread;
|
|
}
|
|
}
|
|
}
|
|
*thread_objs_p = thread_objs;
|
|
*count_ptr = count;
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_subgroups(JavaThread* current_thread, Handle group_hdl, jint *count_ptr, objArrayHandle *group_objs_p) {
|
|
|
|
// This call collects the strong and weak groups
|
|
JavaThread* THREAD = current_thread;
|
|
JavaValue result(T_OBJECT);
|
|
JavaCalls::call_virtual(&result,
|
|
group_hdl,
|
|
vmClasses::ThreadGroup_klass(),
|
|
SymbolTable::new_permanent_symbol("subgroupsAsArray"),
|
|
vmSymbols::void_threadgroup_array_signature(),
|
|
THREAD);
|
|
if (HAS_PENDING_EXCEPTION) {
|
|
Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
|
|
CLEAR_PENDING_EXCEPTION;
|
|
if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
|
|
return JVMTI_ERROR_OUT_OF_MEMORY;
|
|
} else {
|
|
return JVMTI_ERROR_INTERNAL;
|
|
}
|
|
}
|
|
|
|
assert(result.get_type() == T_OBJECT, "just checking");
|
|
objArrayOop groups = (objArrayOop)result.get_oop();
|
|
|
|
*count_ptr = groups == nullptr ? 0 : groups->length();
|
|
*group_objs_p = objArrayHandle(current_thread, groups);
|
|
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
//
|
|
// Object Monitor Information
|
|
//
|
|
|
|
//
|
|
// Count the number of objects for a lightweight monitor. The hobj
|
|
// parameter is object that owns the monitor so this routine will
|
|
// count the number of times the same object was locked by frames
|
|
// in java_thread.
|
|
//
|
|
jint
|
|
JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) {
|
|
jint ret = 0;
|
|
if (!java_thread->has_last_Java_frame()) {
|
|
return ret; // no Java frames so no monitors
|
|
}
|
|
|
|
Thread* current_thread = Thread::current();
|
|
ResourceMark rm(current_thread);
|
|
HandleMark hm(current_thread);
|
|
RegisterMap reg_map(java_thread,
|
|
RegisterMap::UpdateMap::include,
|
|
RegisterMap::ProcessFrames::include,
|
|
RegisterMap::WalkContinuation::skip);
|
|
|
|
for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != nullptr;
|
|
jvf = jvf->java_sender()) {
|
|
GrowableArray<MonitorInfo*>* mons = jvf->monitors();
|
|
if (!mons->is_empty()) {
|
|
for (int i = 0; i < mons->length(); i++) {
|
|
MonitorInfo *mi = mons->at(i);
|
|
if (mi->owner_is_scalar_replaced()) continue;
|
|
|
|
// see if owner of the monitor is our object
|
|
if (mi->owner() != nullptr && mi->owner() == hobj()) {
|
|
ret++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread,
|
|
jobject *monitor_ptr, bool is_virtual) {
|
|
Thread *current_thread = Thread::current();
|
|
assert(java_thread->is_handshake_safe_for(current_thread),
|
|
"call by myself or at handshake");
|
|
if (!is_virtual && JvmtiEnvBase::is_cthread_with_continuation(java_thread)) {
|
|
// Carrier thread with a mounted continuation case.
|
|
// No contended monitor can be owned by carrier thread in this case.
|
|
*monitor_ptr = nullptr;
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
oop obj = nullptr;
|
|
// The ObjectMonitor* can't be async deflated since we are either
|
|
// at a safepoint or the calling thread is operating on itself so
|
|
// it cannot leave the underlying wait()/enter() call.
|
|
ObjectMonitor *mon = java_thread->current_waiting_monitor();
|
|
if (mon == nullptr) {
|
|
// thread is not doing an Object.wait() call
|
|
mon = java_thread->current_pending_monitor();
|
|
if (mon != nullptr) {
|
|
// The thread is trying to enter() an ObjectMonitor.
|
|
obj = mon->object();
|
|
assert(obj != nullptr, "ObjectMonitor should have a valid object!");
|
|
}
|
|
} else {
|
|
// thread is doing an Object.wait() call
|
|
oop thread_oop = get_vthread_or_thread_oop(java_thread);
|
|
jint state = get_thread_or_vthread_state(thread_oop, java_thread);
|
|
|
|
if (state & JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER) {
|
|
// thread is re-entering the monitor in an Object.wait() call
|
|
obj = mon->object();
|
|
assert(obj != nullptr, "Object.wait() should have an object");
|
|
}
|
|
}
|
|
|
|
if (obj == nullptr) {
|
|
*monitor_ptr = nullptr;
|
|
} else {
|
|
HandleMark hm(current_thread);
|
|
Handle hobj(current_thread, obj);
|
|
*monitor_ptr = jni_reference(calling_thread, hobj);
|
|
}
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread,
|
|
GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) {
|
|
// Note:
|
|
// calling_thread is the thread that requested the list of monitors for java_thread.
|
|
// java_thread is the thread owning the monitors.
|
|
// current_thread is the thread executing this code, can be a non-JavaThread (e.g. VM Thread).
|
|
// And they all may be different threads.
|
|
jvmtiError err = JVMTI_ERROR_NONE;
|
|
Thread *current_thread = Thread::current();
|
|
assert(java_thread->is_handshake_safe_for(current_thread),
|
|
"call by myself or at handshake");
|
|
|
|
if (JvmtiEnvBase::is_cthread_with_continuation(java_thread)) {
|
|
// Carrier thread with a mounted continuation case.
|
|
// No contended monitor can be owned by carrier thread in this case.
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
if (java_thread->has_last_Java_frame()) {
|
|
ResourceMark rm(current_thread);
|
|
HandleMark hm(current_thread);
|
|
RegisterMap reg_map(java_thread,
|
|
RegisterMap::UpdateMap::include,
|
|
RegisterMap::ProcessFrames::include,
|
|
RegisterMap::WalkContinuation::skip);
|
|
|
|
int depth = 0;
|
|
for (javaVFrame *jvf = get_cthread_last_java_vframe(java_thread, ®_map);
|
|
jvf != nullptr; jvf = jvf->java_sender()) {
|
|
if (MaxJavaStackTraceDepth == 0 || depth++ < MaxJavaStackTraceDepth) { // check for stack too deep
|
|
// add locked objects for this frame into list
|
|
err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
return err;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Get off stack monitors. (e.g. acquired via jni MonitorEnter).
|
|
JvmtiMonitorClosure jmc(calling_thread, owned_monitors_list, this);
|
|
ObjectSynchronizer::owned_monitors_iterate(&jmc, java_thread);
|
|
err = jmc.error();
|
|
|
|
return err;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_owned_monitors(JavaThread* calling_thread, JavaThread* java_thread, javaVFrame* jvf,
|
|
GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) {
|
|
jvmtiError err = JVMTI_ERROR_NONE;
|
|
Thread *current_thread = Thread::current();
|
|
assert(java_thread->is_handshake_safe_for(current_thread),
|
|
"call by myself or at handshake");
|
|
|
|
int depth = 0;
|
|
for ( ; jvf != nullptr; jvf = jvf->java_sender()) {
|
|
if (MaxJavaStackTraceDepth == 0 || depth++ < MaxJavaStackTraceDepth) { // check for stack too deep
|
|
// Add locked objects for this frame into list.
|
|
err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth - 1);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
return err;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Get off stack monitors. (e.g. acquired via jni MonitorEnter).
|
|
JvmtiMonitorClosure jmc(calling_thread, owned_monitors_list, this);
|
|
ObjectSynchronizer::owned_monitors_iterate(&jmc, java_thread);
|
|
err = jmc.error();
|
|
|
|
return err;
|
|
}
|
|
|
|
// Save JNI local handles for any objects that this frame owns.
|
|
jvmtiError
|
|
JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread,
|
|
javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, jint stack_depth) {
|
|
jvmtiError err = JVMTI_ERROR_NONE;
|
|
Thread* current_thread = Thread::current();
|
|
ResourceMark rm(current_thread);
|
|
HandleMark hm(current_thread);
|
|
|
|
GrowableArray<MonitorInfo*>* mons = jvf->monitors();
|
|
if (mons->is_empty()) {
|
|
return err; // this javaVFrame holds no monitors
|
|
}
|
|
|
|
oop wait_obj = nullptr;
|
|
{
|
|
// The ObjectMonitor* can't be async deflated since we are either
|
|
// at a safepoint or the calling thread is operating on itself so
|
|
// it cannot leave the underlying wait() call.
|
|
// Save object of current wait() call (if any) for later comparison.
|
|
ObjectMonitor *mon = java_thread->current_waiting_monitor();
|
|
if (mon != nullptr) {
|
|
wait_obj = mon->object();
|
|
}
|
|
}
|
|
oop pending_obj = nullptr;
|
|
{
|
|
// The ObjectMonitor* can't be async deflated since we are either
|
|
// at a safepoint or the calling thread is operating on itself so
|
|
// it cannot leave the underlying enter() call.
|
|
// Save object of current enter() call (if any) for later comparison.
|
|
ObjectMonitor *mon = java_thread->current_pending_monitor();
|
|
if (mon != nullptr) {
|
|
pending_obj = mon->object();
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < mons->length(); i++) {
|
|
MonitorInfo *mi = mons->at(i);
|
|
|
|
if (mi->owner_is_scalar_replaced()) continue;
|
|
|
|
oop obj = mi->owner();
|
|
if (obj == nullptr) {
|
|
// this monitor doesn't have an owning object so skip it
|
|
continue;
|
|
}
|
|
|
|
if (wait_obj == obj) {
|
|
// the thread is waiting on this monitor so it isn't really owned
|
|
continue;
|
|
}
|
|
|
|
if (pending_obj == obj) {
|
|
// the thread is pending on this monitor so it isn't really owned
|
|
continue;
|
|
}
|
|
|
|
if (owned_monitors_list->length() > 0) {
|
|
// Our list has at least one object on it so we have to check
|
|
// for recursive object locking
|
|
bool found = false;
|
|
for (int j = 0; j < owned_monitors_list->length(); j++) {
|
|
jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor;
|
|
oop check = JNIHandles::resolve(jobj);
|
|
if (check == obj) {
|
|
found = true; // we found the object
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found) {
|
|
// already have this object so don't include it
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// add the owning object to our list
|
|
jvmtiMonitorStackDepthInfo *jmsdi;
|
|
err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
return err;
|
|
}
|
|
Handle hobj(Thread::current(), obj);
|
|
jmsdi->monitor = jni_reference(calling_thread, hobj);
|
|
jmsdi->stack_depth = stack_depth;
|
|
owned_monitors_list->append(jmsdi);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_stack_trace(javaVFrame *jvf,
|
|
jint start_depth, jint max_count,
|
|
jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
|
|
Thread *current_thread = Thread::current();
|
|
ResourceMark rm(current_thread);
|
|
HandleMark hm(current_thread);
|
|
int count = 0;
|
|
|
|
if (start_depth != 0) {
|
|
if (start_depth > 0) {
|
|
for (int j = 0; j < start_depth && jvf != nullptr; j++) {
|
|
jvf = jvf->java_sender();
|
|
}
|
|
if (jvf == nullptr) {
|
|
// start_depth is deeper than the stack depth.
|
|
return JVMTI_ERROR_ILLEGAL_ARGUMENT;
|
|
}
|
|
} else { // start_depth < 0
|
|
// We are referencing the starting depth based on the oldest
|
|
// part of the stack.
|
|
// Optimize to limit the number of times that java_sender() is called.
|
|
javaVFrame *jvf_cursor = jvf;
|
|
javaVFrame *jvf_prev = nullptr;
|
|
javaVFrame *jvf_prev_prev = nullptr;
|
|
int j = 0;
|
|
while (jvf_cursor != nullptr) {
|
|
jvf_prev_prev = jvf_prev;
|
|
jvf_prev = jvf_cursor;
|
|
for (j = 0; j > start_depth && jvf_cursor != nullptr; j--) {
|
|
jvf_cursor = jvf_cursor->java_sender();
|
|
}
|
|
}
|
|
if (j == start_depth) {
|
|
// Previous pointer is exactly where we want to start.
|
|
jvf = jvf_prev;
|
|
} else {
|
|
// We need to back up further to get to the right place.
|
|
if (jvf_prev_prev == nullptr) {
|
|
// The -start_depth is greater than the stack depth.
|
|
return JVMTI_ERROR_ILLEGAL_ARGUMENT;
|
|
}
|
|
// j is now the number of frames on the stack starting with
|
|
// jvf_prev, we start from jvf_prev_prev and move older on
|
|
// the stack that many, and the result is -start_depth frames
|
|
// remaining.
|
|
jvf = jvf_prev_prev;
|
|
for (; j < 0; j++) {
|
|
jvf = jvf->java_sender();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
for (; count < max_count && jvf != nullptr; count++) {
|
|
frame_buffer[count].method = jvf->method()->jmethod_id();
|
|
frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci());
|
|
jvf = jvf->java_sender();
|
|
}
|
|
*count_ptr = count;
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_stack_trace(JavaThread *java_thread,
|
|
jint start_depth, jint max_count,
|
|
jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
|
|
Thread *current_thread = Thread::current();
|
|
assert(SafepointSynchronize::is_at_safepoint() ||
|
|
java_thread->is_handshake_safe_for(current_thread),
|
|
"call by myself / at safepoint / at handshake");
|
|
int count = 0;
|
|
jvmtiError err = JVMTI_ERROR_NONE;
|
|
|
|
if (java_thread->has_last_Java_frame()) {
|
|
RegisterMap reg_map(java_thread,
|
|
RegisterMap::UpdateMap::include,
|
|
RegisterMap::ProcessFrames::skip,
|
|
RegisterMap::WalkContinuation::skip);
|
|
ResourceMark rm(current_thread);
|
|
javaVFrame *jvf = get_cthread_last_java_vframe(java_thread, ®_map);
|
|
|
|
err = get_stack_trace(jvf, start_depth, max_count, frame_buffer, count_ptr);
|
|
} else {
|
|
*count_ptr = 0;
|
|
if (start_depth != 0) {
|
|
// no frames and there is a starting depth
|
|
err = JVMTI_ERROR_ILLEGAL_ARGUMENT;
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
jint
|
|
JvmtiEnvBase::get_frame_count(javaVFrame *jvf) {
|
|
int count = 0;
|
|
|
|
while (jvf != nullptr) {
|
|
jvf = jvf->java_sender();
|
|
count++;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_frame_count(JavaThread* jt, jint *count_ptr) {
|
|
Thread *current_thread = Thread::current();
|
|
assert(current_thread == jt ||
|
|
SafepointSynchronize::is_at_safepoint() ||
|
|
jt->is_handshake_safe_for(current_thread),
|
|
"call by myself / at safepoint / at handshake");
|
|
|
|
if (!jt->has_last_Java_frame()) { // no Java frames
|
|
*count_ptr = 0;
|
|
} else {
|
|
ResourceMark rm(current_thread);
|
|
RegisterMap reg_map(jt,
|
|
RegisterMap::UpdateMap::include,
|
|
RegisterMap::ProcessFrames::include,
|
|
RegisterMap::WalkContinuation::skip);
|
|
javaVFrame *jvf = get_cthread_last_java_vframe(jt, ®_map);
|
|
|
|
*count_ptr = get_frame_count(jvf);
|
|
}
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_frame_count(oop vthread_oop, jint *count_ptr) {
|
|
Thread *current_thread = Thread::current();
|
|
ResourceMark rm(current_thread);
|
|
javaVFrame *jvf = JvmtiEnvBase::get_vthread_jvf(vthread_oop);
|
|
|
|
*count_ptr = get_frame_count(jvf);
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_frame_location(javaVFrame* jvf, jint depth,
|
|
jmethodID* method_ptr, jlocation* location_ptr) {
|
|
int cur_depth = 0;
|
|
|
|
while (jvf != nullptr && cur_depth < depth) {
|
|
jvf = jvf->java_sender();
|
|
cur_depth++;
|
|
}
|
|
assert(depth >= cur_depth, "ran out of frames too soon");
|
|
if (jvf == nullptr) {
|
|
return JVMTI_ERROR_NO_MORE_FRAMES;
|
|
}
|
|
Method* method = jvf->method();
|
|
if (method->is_native()) {
|
|
*location_ptr = -1;
|
|
} else {
|
|
*location_ptr = jvf->bci();
|
|
}
|
|
*method_ptr = method->jmethod_id();
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth,
|
|
jmethodID* method_ptr, jlocation* location_ptr) {
|
|
Thread* current = Thread::current();
|
|
assert(java_thread->is_handshake_safe_for(current),
|
|
"call by myself or at handshake");
|
|
if (!java_thread->has_last_Java_frame()) {
|
|
return JVMTI_ERROR_NO_MORE_FRAMES;
|
|
}
|
|
ResourceMark rm(current);
|
|
HandleMark hm(current);
|
|
RegisterMap reg_map(java_thread,
|
|
RegisterMap::UpdateMap::include,
|
|
RegisterMap::ProcessFrames::skip,
|
|
RegisterMap::WalkContinuation::include);
|
|
javaVFrame* jvf = JvmtiEnvBase::get_cthread_last_java_vframe(java_thread, ®_map);
|
|
|
|
return get_frame_location(jvf, depth, method_ptr, location_ptr);
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_frame_location(oop vthread_oop, jint depth,
|
|
jmethodID* method_ptr, jlocation* location_ptr) {
|
|
Thread* current = Thread::current();
|
|
ResourceMark rm(current);
|
|
HandleMark hm(current);
|
|
javaVFrame *jvf = JvmtiEnvBase::get_vthread_jvf(vthread_oop);
|
|
|
|
return get_frame_location(jvf, depth, method_ptr, location_ptr);
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::set_frame_pop(JvmtiThreadState* state, javaVFrame* jvf, jint depth) {
|
|
for (int d = 0; jvf != nullptr && d < depth; d++) {
|
|
jvf = jvf->java_sender();
|
|
}
|
|
if (jvf == nullptr) {
|
|
return JVMTI_ERROR_NO_MORE_FRAMES;
|
|
}
|
|
if (jvf->method()->is_native()) {
|
|
return JVMTI_ERROR_OPAQUE_FRAME;
|
|
}
|
|
assert(jvf->frame_pointer() != nullptr, "frame pointer mustn't be null");
|
|
int frame_number = (int)get_frame_count(jvf);
|
|
state->env_thread_state((JvmtiEnvBase*)this)->set_frame_pop(frame_number);
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
bool
|
|
JvmtiEnvBase::is_cthread_with_mounted_vthread(JavaThread* jt) {
|
|
oop thread_oop = jt->threadObj();
|
|
assert(thread_oop != nullptr, "sanity check");
|
|
oop mounted_vt = jt->jvmti_vthread();
|
|
|
|
return mounted_vt != nullptr && mounted_vt != thread_oop;
|
|
}
|
|
|
|
bool
|
|
JvmtiEnvBase::is_cthread_with_continuation(JavaThread* jt) {
|
|
const ContinuationEntry* cont_entry = nullptr;
|
|
if (jt->has_last_Java_frame()) {
|
|
cont_entry = jt->vthread_continuation();
|
|
}
|
|
return cont_entry != nullptr && is_cthread_with_mounted_vthread(jt);
|
|
}
|
|
|
|
// Check if VirtualThread or BoundVirtualThread is suspended.
|
|
bool
|
|
JvmtiEnvBase::is_vthread_suspended(oop vt_oop, JavaThread* jt) {
|
|
bool suspended = false;
|
|
if (java_lang_VirtualThread::is_instance(vt_oop)) {
|
|
suspended = JvmtiVTSuspender::is_vthread_suspended(vt_oop);
|
|
}
|
|
if (vt_oop->is_a(vmClasses::BoundVirtualThread_klass())) {
|
|
suspended = jt->is_suspended();
|
|
}
|
|
return suspended;
|
|
}
|
|
|
|
// If (thread == null) then return current thread object.
|
|
// Otherwise return JNIHandles::resolve_external_guard(thread).
|
|
oop
|
|
JvmtiEnvBase::current_thread_obj_or_resolve_external_guard(jthread thread) {
|
|
oop thread_obj = JNIHandles::resolve_external_guard(thread);
|
|
if (thread == nullptr) {
|
|
thread_obj = get_vthread_or_thread_oop(JavaThread::current());
|
|
}
|
|
return thread_obj;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_threadOop_and_JavaThread(ThreadsList* t_list, jthread thread, JavaThread* cur_thread,
|
|
JavaThread** jt_pp, oop* thread_oop_p) {
|
|
JavaThread* java_thread = nullptr;
|
|
oop thread_oop = nullptr;
|
|
|
|
if (thread == nullptr) {
|
|
if (cur_thread == nullptr) { // cur_thread can be null when called from a VM_op
|
|
return JVMTI_ERROR_INVALID_THREAD;
|
|
}
|
|
java_thread = cur_thread;
|
|
thread_oop = get_vthread_or_thread_oop(java_thread);
|
|
if (thread_oop == nullptr || !thread_oop->is_a(vmClasses::Thread_klass())) {
|
|
return JVMTI_ERROR_INVALID_THREAD;
|
|
}
|
|
} else {
|
|
jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(t_list, thread, &java_thread, &thread_oop);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
// We got an error code so we don't have a JavaThread*, but only return
|
|
// an error from here if we didn't get a valid thread_oop. In a vthread case
|
|
// the cv_external_thread_to_JavaThread is expected to correctly set the
|
|
// thread_oop and return JVMTI_ERROR_INVALID_THREAD which we ignore here.
|
|
if (thread_oop == nullptr || err != JVMTI_ERROR_INVALID_THREAD) {
|
|
*thread_oop_p = thread_oop;
|
|
return err;
|
|
}
|
|
}
|
|
if (java_thread == nullptr && java_lang_VirtualThread::is_instance(thread_oop)) {
|
|
java_thread = get_JavaThread_or_null(thread_oop);
|
|
}
|
|
}
|
|
*jt_pp = java_thread;
|
|
*thread_oop_p = thread_oop;
|
|
if (java_lang_VirtualThread::is_instance(thread_oop) &&
|
|
!JvmtiEnvBase::is_vthread_alive(thread_oop)) {
|
|
return JVMTI_ERROR_THREAD_NOT_ALIVE;
|
|
}
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_threadOop_and_JavaThread(ThreadsList* t_list, jthread thread,
|
|
JavaThread** jt_pp, oop* thread_oop_p) {
|
|
JavaThread* cur_thread = JavaThread::current();
|
|
jvmtiError err = get_threadOop_and_JavaThread(t_list, thread, cur_thread, jt_pp, thread_oop_p);
|
|
return err;
|
|
}
|
|
|
|
// Check for JVMTI_ERROR_NOT_SUSPENDED and JVMTI_ERROR_OPAQUE_FRAME errors.
|
|
// Used in PopFrame and ForceEarlyReturn implementations.
|
|
jvmtiError
|
|
JvmtiEnvBase::check_non_suspended_or_opaque_frame(JavaThread* jt, oop thr_obj, bool self) {
|
|
bool is_virtual = thr_obj != nullptr && thr_obj->is_a(vmClasses::BaseVirtualThread_klass());
|
|
|
|
if (is_virtual) {
|
|
if (!is_JavaThread_current(jt, thr_obj)) {
|
|
if (!is_vthread_suspended(thr_obj, jt)) {
|
|
return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
}
|
|
if (jt == nullptr) { // unmounted virtual thread
|
|
return JVMTI_ERROR_OPAQUE_FRAME;
|
|
}
|
|
}
|
|
} else { // platform thread
|
|
if (!self && !jt->is_suspended() &&
|
|
!jt->is_carrier_thread_suspended()) {
|
|
return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
}
|
|
}
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) {
|
|
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
|
|
Thread* current_thread = VMThread::vm_thread();
|
|
assert(current_thread == Thread::current(), "must be");
|
|
|
|
HandleMark hm(current_thread);
|
|
Handle hobj;
|
|
|
|
// Check arguments
|
|
{
|
|
oop mirror = JNIHandles::resolve_external_guard(object);
|
|
NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
|
|
NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER);
|
|
|
|
hobj = Handle(current_thread, mirror);
|
|
}
|
|
|
|
ThreadsListHandle tlh(current_thread);
|
|
JavaThread *owning_thread = nullptr;
|
|
ObjectMonitor *mon = nullptr;
|
|
jvmtiMonitorUsage ret = {
|
|
nullptr, 0, 0, nullptr, 0, nullptr
|
|
};
|
|
|
|
uint32_t debug_bits = 0;
|
|
// first derive the object's owner and entry_count (if any)
|
|
owning_thread = ObjectSynchronizer::get_lock_owner(tlh.list(), hobj);
|
|
if (owning_thread != nullptr) {
|
|
oop thread_oop = get_vthread_or_thread_oop(owning_thread);
|
|
bool is_virtual = java_lang_VirtualThread::is_instance(thread_oop);
|
|
if (is_virtual) {
|
|
thread_oop = nullptr;
|
|
}
|
|
Handle th(current_thread, thread_oop);
|
|
ret.owner = (jthread)jni_reference(calling_thread, th);
|
|
|
|
// The recursions field of a monitor does not reflect recursions
|
|
// as lightweight locks before inflating the monitor are not included.
|
|
// We have to count the number of recursive monitor entries the hard way.
|
|
// We pass a handle to survive any GCs along the way.
|
|
ret.entry_count = is_virtual ? 0 : count_locked_objects(owning_thread, hobj);
|
|
}
|
|
// implied else: entry_count == 0
|
|
|
|
jint nWant = 0, nWait = 0;
|
|
markWord mark = hobj->mark();
|
|
ResourceMark rm(current_thread);
|
|
GrowableArray<JavaThread*>* wantList = nullptr;
|
|
|
|
if (mark.has_monitor()) {
|
|
mon = mark.monitor();
|
|
assert(mon != nullptr, "must have monitor");
|
|
// this object has a heavyweight monitor
|
|
nWant = mon->contentions(); // # of threads contending for monitor entry, but not re-entry
|
|
nWait = mon->waiters(); // # of threads waiting for notification,
|
|
// or to re-enter monitor, in Object.wait()
|
|
|
|
// Get the actual set of threads trying to enter, or re-enter, the monitor.
|
|
wantList = Threads::get_pending_threads(tlh.list(), nWant + nWait, (address)mon);
|
|
nWant = wantList->length();
|
|
} else {
|
|
// this object has a lightweight monitor
|
|
}
|
|
|
|
jint skipped = 0;
|
|
if (mon != nullptr) {
|
|
// Robustness: the actual waiting list can be smaller.
|
|
// The nWait count we got from the mon->waiters() may include the re-entering
|
|
// the monitor threads after being notified. Here we are correcting the actual
|
|
// number of the waiting threads by excluding those re-entering the monitor.
|
|
nWait = 0;
|
|
for (ObjectWaiter* waiter = mon->first_waiter();
|
|
waiter != nullptr && (nWait == 0 || waiter != mon->first_waiter());
|
|
waiter = mon->next_waiter(waiter)) {
|
|
JavaThread *w = mon->thread_of_waiter(waiter);
|
|
oop thread_oop = get_vthread_or_thread_oop(w);
|
|
if (java_lang_VirtualThread::is_instance(thread_oop)) {
|
|
skipped++;
|
|
}
|
|
nWait++;
|
|
}
|
|
}
|
|
ret.waiter_count = nWant;
|
|
ret.notify_waiter_count = nWait - skipped;
|
|
|
|
// Allocate memory for heavyweight and lightweight monitor.
|
|
jvmtiError err;
|
|
err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
return err;
|
|
}
|
|
err = allocate(ret.notify_waiter_count * sizeof(jthread *),
|
|
(unsigned char**)&ret.notify_waiters);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
deallocate((unsigned char*)ret.waiters);
|
|
return err;
|
|
}
|
|
|
|
// now derive the rest of the fields
|
|
if (mon != nullptr) {
|
|
// this object has a heavyweight monitor
|
|
|
|
// null out memory for robustness
|
|
if (ret.waiters != nullptr) {
|
|
memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *));
|
|
}
|
|
if (ret.notify_waiters != nullptr) {
|
|
memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *));
|
|
}
|
|
|
|
if (ret.waiter_count > 0) { // we have contending threads waiting to enter/re-enter the monitor
|
|
// identify threads waiting to enter and re-enter the monitor
|
|
// get_pending_threads returns only java thread so we do not need to
|
|
// check for non java threads.
|
|
for (int i = 0; i < nWant; i++) {
|
|
JavaThread *pending_thread = wantList->at(i);
|
|
Handle th(current_thread, get_vthread_or_thread_oop(pending_thread));
|
|
ret.waiters[i] = (jthread)jni_reference(calling_thread, th);
|
|
}
|
|
}
|
|
if (ret.notify_waiter_count > 0) { // we have threads waiting to be notified in Object.wait()
|
|
ObjectWaiter *waiter = mon->first_waiter();
|
|
jint skipped = 0;
|
|
for (int i = 0; i < nWait; i++) {
|
|
JavaThread *w = mon->thread_of_waiter(waiter);
|
|
oop thread_oop = get_vthread_or_thread_oop(w);
|
|
bool is_virtual = java_lang_VirtualThread::is_instance(thread_oop);
|
|
assert(w != nullptr, "sanity check");
|
|
if (java_lang_VirtualThread::is_instance(thread_oop)) {
|
|
skipped++;
|
|
} else {
|
|
// If the thread was found on the ObjectWaiter list, then
|
|
// it has not been notified.
|
|
Handle th(current_thread, get_vthread_or_thread_oop(w));
|
|
ret.notify_waiters[i - skipped] = (jthread)jni_reference(calling_thread, th);
|
|
}
|
|
waiter = mon->next_waiter(waiter);
|
|
}
|
|
}
|
|
} else {
|
|
// this object has a lightweight monitor and we have nothing more
|
|
// to do here because the defaults are just fine.
|
|
}
|
|
|
|
// we don't update return parameter unless everything worked
|
|
*info_ptr = ret;
|
|
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::check_thread_list(jint count, const jthread* list) {
|
|
if (list == nullptr && count != 0) {
|
|
return JVMTI_ERROR_NULL_POINTER;
|
|
}
|
|
for (int i = 0; i < count; i++) {
|
|
jthread thread = list[i];
|
|
oop thread_oop = JNIHandles::resolve_external_guard(thread);
|
|
if (thread_oop == nullptr || !thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
|
|
return JVMTI_ERROR_INVALID_THREAD;
|
|
}
|
|
}
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
bool
|
|
JvmtiEnvBase::is_in_thread_list(jint count, const jthread* list, oop jt_oop) {
|
|
for (int idx = 0; idx < count; idx++) {
|
|
jthread thread = list[idx];
|
|
oop thread_oop = JNIHandles::resolve_external_guard(thread);
|
|
if (thread_oop == jt_oop) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
class VM_SetNotifyJvmtiEventsMode : public VM_Operation {
|
|
private:
|
|
bool _enable;
|
|
|
|
static void correct_jvmti_thread_state(JavaThread* jt) {
|
|
oop ct_oop = jt->threadObj();
|
|
oop vt_oop = jt->vthread();
|
|
JvmtiThreadState* jt_state = jt->jvmti_thread_state();
|
|
JvmtiThreadState* ct_state = java_lang_Thread::jvmti_thread_state(jt->threadObj());
|
|
JvmtiThreadState* vt_state = vt_oop != nullptr ? java_lang_Thread::jvmti_thread_state(vt_oop) : nullptr;
|
|
bool virt = vt_oop != nullptr && java_lang_VirtualThread::is_instance(vt_oop);
|
|
|
|
// Correct jt->jvmti_thread_state() and jt->jvmti_vthread().
|
|
// It was not maintained while notifyJvmti was disabled.
|
|
if (virt) {
|
|
jt->set_jvmti_thread_state(nullptr); // reset jt->jvmti_thread_state()
|
|
jt->set_jvmti_vthread(vt_oop); // restore jt->jvmti_vthread()
|
|
} else {
|
|
jt->set_jvmti_thread_state(ct_state); // restore jt->jvmti_thread_state()
|
|
jt->set_jvmti_vthread(ct_oop); // restore jt->jvmti_vthread()
|
|
}
|
|
}
|
|
|
|
// This function is called only if _enable == true.
|
|
// Iterates over all JavaThread's, restores jt->jvmti_thread_state() and
|
|
// jt->jvmti_vthread() for VTMS transition protocol.
|
|
void correct_jvmti_thread_states() {
|
|
for (JavaThread* jt : ThreadsListHandle()) {
|
|
if (jt->is_in_VTMS_transition()) {
|
|
jt->set_VTMS_transition_mark(true);
|
|
continue; // no need in JvmtiThreadState correction below if in transition
|
|
}
|
|
correct_jvmti_thread_state(jt);
|
|
}
|
|
}
|
|
|
|
public:
|
|
VMOp_Type type() const { return VMOp_SetNotifyJvmtiEventsMode; }
|
|
bool allow_nested_vm_operations() const { return false; }
|
|
VM_SetNotifyJvmtiEventsMode(bool enable) : _enable(enable) {
|
|
}
|
|
|
|
void doit() {
|
|
if (_enable) {
|
|
correct_jvmti_thread_states();
|
|
}
|
|
JvmtiVTMSTransitionDisabler::set_VTMS_notify_jvmti_events(_enable);
|
|
}
|
|
};
|
|
|
|
// This function is to support agents loaded into running VM.
|
|
// Must be called in thread-in-native mode.
|
|
bool
|
|
JvmtiEnvBase::enable_virtual_threads_notify_jvmti() {
|
|
if (!Continuations::enabled()) {
|
|
return false;
|
|
}
|
|
if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
|
|
return false; // already enabled
|
|
}
|
|
VM_SetNotifyJvmtiEventsMode op(true);
|
|
VMThread::execute(&op);
|
|
return true;
|
|
}
|
|
|
|
// This function is used in WhiteBox, only needed to test the function above.
|
|
// It is unsafe to use this function when virtual threads are executed.
|
|
// Must be called in thread-in-native mode.
|
|
bool
|
|
JvmtiEnvBase::disable_virtual_threads_notify_jvmti() {
|
|
if (!Continuations::enabled()) {
|
|
return false;
|
|
}
|
|
if (!JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
|
|
return false; // already disabled
|
|
}
|
|
JvmtiVTMSTransitionDisabler disabler(true); // ensure there are no other disablers
|
|
VM_SetNotifyJvmtiEventsMode op(false);
|
|
VMThread::execute(&op);
|
|
return true;
|
|
}
|
|
|
|
// java_thread - protected by ThreadsListHandle
|
|
jvmtiError
|
|
JvmtiEnvBase::suspend_thread(oop thread_oop, JavaThread* java_thread, bool single_suspend,
|
|
int* need_safepoint_p) {
|
|
JavaThread* current = JavaThread::current();
|
|
HandleMark hm(current);
|
|
Handle thread_h(current, thread_oop);
|
|
bool is_virtual = java_lang_VirtualThread::is_instance(thread_h());
|
|
|
|
if (is_virtual) {
|
|
if (single_suspend) {
|
|
if (JvmtiVTSuspender::is_vthread_suspended(thread_h())) {
|
|
return JVMTI_ERROR_THREAD_SUSPENDED;
|
|
}
|
|
JvmtiVTSuspender::register_vthread_suspend(thread_h());
|
|
// Check if virtual thread is mounted and there is a java_thread.
|
|
// A non-null java_thread is always passed in the !single_suspend case.
|
|
oop carrier_thread = java_lang_VirtualThread::carrier_thread(thread_h());
|
|
java_thread = carrier_thread == nullptr ? nullptr : java_lang_Thread::thread(carrier_thread);
|
|
}
|
|
// The java_thread can be still blocked in VTMS transition after a previous JVMTI resume call.
|
|
// There is no need to suspend the java_thread in this case. After vthread unblocking,
|
|
// it will check for ext_suspend request and suspend itself if necessary.
|
|
if (java_thread == nullptr || java_thread->is_suspended()) {
|
|
// We are done if the virtual thread is unmounted or
|
|
// the java_thread is externally suspended.
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
// The virtual thread is mounted: suspend the java_thread.
|
|
}
|
|
// Don't allow hidden thread suspend request.
|
|
if (java_thread->is_hidden_from_external_view()) {
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
bool is_thread_carrying = is_thread_carrying_vthread(java_thread, thread_h());
|
|
|
|
// A case of non-virtual thread.
|
|
if (!is_virtual) {
|
|
// Thread.suspend() is used in some tests. It sets jt->is_suspended() only.
|
|
if (java_thread->is_carrier_thread_suspended() ||
|
|
(!is_thread_carrying && java_thread->is_suspended())) {
|
|
return JVMTI_ERROR_THREAD_SUSPENDED;
|
|
}
|
|
java_thread->set_carrier_thread_suspended();
|
|
}
|
|
assert(!java_thread->is_in_VTMS_transition(), "sanity check");
|
|
|
|
assert(!single_suspend || (!is_virtual && java_thread->is_carrier_thread_suspended()) ||
|
|
(is_virtual && JvmtiVTSuspender::is_vthread_suspended(thread_h())),
|
|
"sanity check");
|
|
|
|
// An attempt to handshake-suspend a thread carrying a virtual thread will result in
|
|
// suspension of mounted virtual thread. So, we just mark it as suspended
|
|
// and it will be actually suspended at virtual thread unmount transition.
|
|
if (!is_thread_carrying) {
|
|
assert(thread_h() != nullptr, "sanity check");
|
|
assert(single_suspend || thread_h()->is_a(vmClasses::BaseVirtualThread_klass()),
|
|
"SuspendAllVirtualThreads should never suspend non-virtual threads");
|
|
// Case of mounted virtual or attached carrier thread.
|
|
if (!JvmtiSuspendControl::suspend(java_thread)) {
|
|
// Thread is already suspended or in process of exiting.
|
|
if (java_thread->is_exiting()) {
|
|
// The thread was in the process of exiting.
|
|
return JVMTI_ERROR_THREAD_NOT_ALIVE;
|
|
}
|
|
return JVMTI_ERROR_THREAD_SUSPENDED;
|
|
}
|
|
}
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
// java_thread - protected by ThreadsListHandle
|
|
jvmtiError
|
|
JvmtiEnvBase::resume_thread(oop thread_oop, JavaThread* java_thread, bool single_resume) {
|
|
JavaThread* current = JavaThread::current();
|
|
HandleMark hm(current);
|
|
Handle thread_h(current, thread_oop);
|
|
bool is_virtual = java_lang_VirtualThread::is_instance(thread_h());
|
|
|
|
if (is_virtual) {
|
|
if (single_resume) {
|
|
if (!JvmtiVTSuspender::is_vthread_suspended(thread_h())) {
|
|
return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
}
|
|
JvmtiVTSuspender::register_vthread_resume(thread_h());
|
|
// Check if virtual thread is mounted and there is a java_thread.
|
|
// A non-null java_thread is always passed in the !single_resume case.
|
|
oop carrier_thread = java_lang_VirtualThread::carrier_thread(thread_h());
|
|
java_thread = carrier_thread == nullptr ? nullptr : java_lang_Thread::thread(carrier_thread);
|
|
}
|
|
// The java_thread can be still blocked in VTMS transition after a previous JVMTI suspend call.
|
|
// There is no need to resume the java_thread in this case. After vthread unblocking,
|
|
// it will check for is_vthread_suspended request and remain resumed if necessary.
|
|
if (java_thread == nullptr || !java_thread->is_suspended()) {
|
|
// We are done if the virtual thread is unmounted or
|
|
// the java_thread is not externally suspended.
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
// The virtual thread is mounted and java_thread is supended: resume the java_thread.
|
|
}
|
|
// Don't allow hidden thread resume request.
|
|
if (java_thread->is_hidden_from_external_view()) {
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
bool is_thread_carrying = is_thread_carrying_vthread(java_thread, thread_h());
|
|
|
|
// A case of a non-virtual thread.
|
|
if (!is_virtual) {
|
|
if (!java_thread->is_carrier_thread_suspended() &&
|
|
(is_thread_carrying || !java_thread->is_suspended())) {
|
|
return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
}
|
|
java_thread->clear_carrier_thread_suspended();
|
|
}
|
|
assert(!java_thread->is_in_VTMS_transition(), "sanity check");
|
|
|
|
if (!is_thread_carrying) {
|
|
assert(thread_h() != nullptr, "sanity check");
|
|
assert(single_resume || thread_h()->is_a(vmClasses::BaseVirtualThread_klass()),
|
|
"ResumeAllVirtualThreads should never resume non-virtual threads");
|
|
if (java_thread->is_suspended()) {
|
|
if (!JvmtiSuspendControl::resume(java_thread)) {
|
|
return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
}
|
|
}
|
|
}
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
ResourceTracker::ResourceTracker(JvmtiEnv* env) {
|
|
_env = env;
|
|
_allocations = new (mtServiceability) GrowableArray<unsigned char*>(20, mtServiceability);
|
|
_failed = false;
|
|
}
|
|
ResourceTracker::~ResourceTracker() {
|
|
if (_failed) {
|
|
for (int i=0; i<_allocations->length(); i++) {
|
|
_env->deallocate(_allocations->at(i));
|
|
}
|
|
}
|
|
delete _allocations;
|
|
}
|
|
|
|
jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) {
|
|
unsigned char *ptr;
|
|
jvmtiError err = _env->allocate(size, &ptr);
|
|
if (err == JVMTI_ERROR_NONE) {
|
|
_allocations->append(ptr);
|
|
*mem_ptr = ptr;
|
|
} else {
|
|
*mem_ptr = nullptr;
|
|
_failed = true;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
unsigned char* ResourceTracker::allocate(jlong size) {
|
|
unsigned char* ptr;
|
|
allocate(size, &ptr);
|
|
return ptr;
|
|
}
|
|
|
|
char* ResourceTracker::strdup(const char* str) {
|
|
char *dup_str = (char*)allocate(strlen(str)+1);
|
|
if (dup_str != nullptr) {
|
|
strcpy(dup_str, str);
|
|
}
|
|
return dup_str;
|
|
}
|
|
|
|
struct StackInfoNode {
|
|
struct StackInfoNode *next;
|
|
jvmtiStackInfo info;
|
|
};
|
|
|
|
// Create a jvmtiStackInfo inside a linked list node and create a
|
|
// buffer for the frame information, both allocated as resource objects.
|
|
// Fill in both the jvmtiStackInfo and the jvmtiFrameInfo.
|
|
// Note that either or both of thr and thread_oop
|
|
// may be null if the thread is new or has exited.
|
|
void
|
|
MultipleStackTracesCollector::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) {
|
|
#ifdef ASSERT
|
|
Thread *current_thread = Thread::current();
|
|
assert(SafepointSynchronize::is_at_safepoint() ||
|
|
thr == nullptr ||
|
|
thr->is_handshake_safe_for(current_thread),
|
|
"unmounted virtual thread / call by myself / at safepoint / at handshake");
|
|
#endif
|
|
|
|
jint state = 0;
|
|
struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode);
|
|
jvmtiStackInfo *infop = &(node->info);
|
|
|
|
node->next = head();
|
|
set_head(node);
|
|
infop->frame_count = 0;
|
|
infop->frame_buffer = nullptr;
|
|
infop->thread = jt;
|
|
|
|
if (java_lang_VirtualThread::is_instance(thread_oop)) {
|
|
state = JvmtiEnvBase::get_vthread_state(thread_oop, thr);
|
|
|
|
if ((state & JVMTI_THREAD_STATE_ALIVE) != 0) {
|
|
javaVFrame *jvf = JvmtiEnvBase::get_vthread_jvf(thread_oop);
|
|
infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count());
|
|
_result = env()->get_stack_trace(jvf, 0, max_frame_count(),
|
|
infop->frame_buffer, &(infop->frame_count));
|
|
}
|
|
} else {
|
|
state = JvmtiEnvBase::get_thread_state(thread_oop, thr);
|
|
if (thr != nullptr && (state & JVMTI_THREAD_STATE_ALIVE) != 0) {
|
|
infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count());
|
|
_result = env()->get_stack_trace(thr, 0, max_frame_count(),
|
|
infop->frame_buffer, &(infop->frame_count));
|
|
}
|
|
}
|
|
_frame_count_total += infop->frame_count;
|
|
infop->state = state;
|
|
}
|
|
|
|
// Based on the stack information in the linked list, allocate memory
|
|
// block to return and fill it from the info in the linked list.
|
|
void
|
|
MultipleStackTracesCollector::allocate_and_fill_stacks(jint thread_count) {
|
|
// do I need to worry about alignment issues?
|
|
jlong alloc_size = thread_count * sizeof(jvmtiStackInfo)
|
|
+ _frame_count_total * sizeof(jvmtiFrameInfo);
|
|
env()->allocate(alloc_size, (unsigned char **)&_stack_info);
|
|
|
|
// pointers to move through the newly allocated space as it is filled in
|
|
jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info
|
|
jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info
|
|
|
|
// copy information in resource area into allocated buffer
|
|
// insert stack info backwards since linked list is backwards
|
|
// insert frame info forwards
|
|
// walk the StackInfoNodes
|
|
for (struct StackInfoNode *sin = head(); sin != nullptr; sin = sin->next) {
|
|
jint frame_count = sin->info.frame_count;
|
|
size_t frames_size = frame_count * sizeof(jvmtiFrameInfo);
|
|
--si;
|
|
memcpy(si, &(sin->info), sizeof(jvmtiStackInfo));
|
|
if (frames_size == 0) {
|
|
si->frame_buffer = nullptr;
|
|
} else {
|
|
memcpy(fi, sin->info.frame_buffer, frames_size);
|
|
si->frame_buffer = fi; // point to the new allocated copy of the frames
|
|
fi += frame_count;
|
|
}
|
|
}
|
|
assert(si == _stack_info, "the last copied stack info must be the first record");
|
|
assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size,
|
|
"the last copied frame info must be the last record");
|
|
}
|
|
|
|
// AdapterClosure is to make use of JvmtiUnitedHandshakeClosure objects from
|
|
// Handshake::execute() which is unaware of the do_vthread() member functions.
|
|
class AdapterClosure : public HandshakeClosure {
|
|
JvmtiUnitedHandshakeClosure* _hs_cl;
|
|
Handle _target_h;
|
|
|
|
public:
|
|
AdapterClosure(JvmtiUnitedHandshakeClosure* hs_cl, Handle target_h)
|
|
: HandshakeClosure(hs_cl->name()), _hs_cl(hs_cl), _target_h(target_h) {}
|
|
|
|
virtual void do_thread(Thread* target) {
|
|
if (java_lang_VirtualThread::is_instance(_target_h())) {
|
|
_hs_cl->do_vthread(_target_h); // virtual thread
|
|
} else {
|
|
_hs_cl->do_thread(target); // platform thread
|
|
}
|
|
}
|
|
};
|
|
|
|
// Supports platform and virtual threads.
|
|
// JvmtiVTMSTransitionDisabler is always set by this function.
|
|
void
|
|
JvmtiHandshake::execute(JvmtiUnitedHandshakeClosure* hs_cl, jthread target) {
|
|
JavaThread* current = JavaThread::current();
|
|
HandleMark hm(current);
|
|
|
|
JvmtiVTMSTransitionDisabler disabler(target);
|
|
ThreadsListHandle tlh(current);
|
|
JavaThread* java_thread = nullptr;
|
|
oop thread_obj = nullptr;
|
|
|
|
jvmtiError err = JvmtiEnvBase::get_threadOop_and_JavaThread(tlh.list(), target, &java_thread, &thread_obj);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
hs_cl->set_result(err);
|
|
return;
|
|
}
|
|
Handle target_h(current, thread_obj);
|
|
execute(hs_cl, &tlh, java_thread, target_h);
|
|
}
|
|
|
|
// Supports platform and virtual threads.
|
|
// A virtual thread is always identified by the target_h oop handle.
|
|
// The target_jt is always nullptr for an unmounted virtual thread.
|
|
// JvmtiVTMSTransitionDisabler has to be set before call to this function.
|
|
void
|
|
JvmtiHandshake::execute(JvmtiUnitedHandshakeClosure* hs_cl, ThreadsListHandle* tlh,
|
|
JavaThread* target_jt, Handle target_h) {
|
|
JavaThread* current = JavaThread::current();
|
|
bool is_virtual = java_lang_VirtualThread::is_instance(target_h());
|
|
bool self = target_jt == current;
|
|
|
|
assert(!Continuations::enabled() || self || !is_virtual || current->is_VTMS_transition_disabler(), "sanity check");
|
|
|
|
hs_cl->set_target_jt(target_jt); // can be needed in the virtual thread case
|
|
hs_cl->set_is_virtual(is_virtual); // can be needed in the virtual thread case
|
|
hs_cl->set_self(self); // needed when suspend is required for non-current target thread
|
|
|
|
if (is_virtual) { // virtual thread
|
|
if (!JvmtiEnvBase::is_vthread_alive(target_h())) {
|
|
return;
|
|
}
|
|
if (target_jt == nullptr) { // unmounted virtual thread
|
|
hs_cl->do_vthread(target_h); // execute handshake closure callback on current thread directly
|
|
}
|
|
}
|
|
if (target_jt != nullptr) { // mounted virtual or platform thread
|
|
AdapterClosure acl(hs_cl, target_h);
|
|
if (self) { // target platform thread is current
|
|
acl.do_thread(target_jt); // execute handshake closure callback on current thread directly
|
|
} else {
|
|
Handshake::execute(&acl, tlh, target_jt); // delegate to Handshake implementation
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
VM_GetThreadListStackTraces::doit() {
|
|
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
|
|
|
|
ResourceMark rm;
|
|
ThreadsListHandle tlh;
|
|
for (int i = 0; i < _thread_count; ++i) {
|
|
jthread jt = _thread_list[i];
|
|
JavaThread* java_thread = nullptr;
|
|
oop thread_oop = nullptr;
|
|
jvmtiError err = JvmtiEnvBase::get_threadOop_and_JavaThread(tlh.list(), jt, nullptr, &java_thread, &thread_oop);
|
|
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
// We got an error code so we don't have a JavaThread *, but
|
|
// only return an error from here if we didn't get a valid
|
|
// thread_oop.
|
|
// In the virtual thread case the get_threadOop_and_JavaThread is expected to correctly set
|
|
// the thread_oop and return JVMTI_ERROR_THREAD_NOT_ALIVE which we ignore here.
|
|
// The corresponding thread state will be recorded in the jvmtiStackInfo.state.
|
|
if (thread_oop == nullptr) {
|
|
_collector.set_result(err);
|
|
return;
|
|
}
|
|
// We have a valid thread_oop.
|
|
}
|
|
_collector.fill_frames(jt, java_thread, thread_oop);
|
|
}
|
|
_collector.allocate_and_fill_stacks(_thread_count);
|
|
}
|
|
|
|
void
|
|
GetSingleStackTraceClosure::doit() {
|
|
JavaThread *jt = _target_jt;
|
|
oop thread_oop = JNIHandles::resolve_external_guard(_jthread);
|
|
|
|
if ((jt == nullptr || !jt->is_exiting()) && thread_oop != nullptr) {
|
|
ResourceMark rm;
|
|
_collector.fill_frames(_jthread, jt, thread_oop);
|
|
_collector.allocate_and_fill_stacks(1);
|
|
set_result(_collector.result());
|
|
}
|
|
}
|
|
|
|
void
|
|
GetSingleStackTraceClosure::do_thread(Thread *target) {
|
|
assert(_target_jt == JavaThread::cast(target), "sanity check");
|
|
doit();
|
|
}
|
|
|
|
void
|
|
GetSingleStackTraceClosure::do_vthread(Handle target_h) {
|
|
// Use jvmti_vthread() instead of vthread() as target could have temporarily changed
|
|
// identity to carrier thread (see VirtualThread.switchToCarrierThread).
|
|
assert(_target_jt == nullptr || _target_jt->jvmti_vthread() == target_h(), "sanity check");
|
|
doit();
|
|
}
|
|
|
|
void
|
|
VM_GetAllStackTraces::doit() {
|
|
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
|
|
|
|
ResourceMark rm;
|
|
_final_thread_count = 0;
|
|
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) {
|
|
oop thread_oop = jt->threadObj();
|
|
if (thread_oop != nullptr &&
|
|
!jt->is_exiting() &&
|
|
java_lang_Thread::is_alive(thread_oop) &&
|
|
!jt->is_hidden_from_external_view() &&
|
|
!thread_oop->is_a(vmClasses::BoundVirtualThread_klass())) {
|
|
++_final_thread_count;
|
|
// Handle block of the calling thread is used to create local refs.
|
|
_collector.fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop),
|
|
jt, thread_oop);
|
|
}
|
|
}
|
|
_collector.allocate_and_fill_stacks(_final_thread_count);
|
|
}
|
|
|
|
// Verifies that the top frame is a java frame in an expected state.
|
|
// Deoptimizes frame if needed.
|
|
// Checks that the frame method signature matches the return type (tos).
|
|
// HandleMark must be defined in the caller only.
|
|
// It is to keep a ret_ob_h handle alive after return to the caller.
|
|
jvmtiError
|
|
JvmtiEnvBase::check_top_frame(Thread* current_thread, JavaThread* java_thread,
|
|
jvalue value, TosState tos, Handle* ret_ob_h) {
|
|
ResourceMark rm(current_thread);
|
|
|
|
javaVFrame* jvf = jvf_for_thread_and_depth(java_thread, 0);
|
|
NULL_CHECK(jvf, JVMTI_ERROR_NO_MORE_FRAMES);
|
|
|
|
if (jvf->method()->is_native()) {
|
|
return JVMTI_ERROR_OPAQUE_FRAME;
|
|
}
|
|
|
|
// If the frame is a compiled one, need to deoptimize it.
|
|
if (jvf->is_compiled_frame()) {
|
|
if (!jvf->fr().can_be_deoptimized()) {
|
|
return JVMTI_ERROR_OPAQUE_FRAME;
|
|
}
|
|
Deoptimization::deoptimize_frame(java_thread, jvf->fr().id());
|
|
}
|
|
|
|
// Get information about method return type
|
|
Symbol* signature = jvf->method()->signature();
|
|
|
|
ResultTypeFinder rtf(signature);
|
|
TosState fr_tos = as_TosState(rtf.type());
|
|
if (fr_tos != tos) {
|
|
if (tos != itos || (fr_tos != btos && fr_tos != ztos && fr_tos != ctos && fr_tos != stos)) {
|
|
return JVMTI_ERROR_TYPE_MISMATCH;
|
|
}
|
|
}
|
|
|
|
// Check that the jobject class matches the return type signature.
|
|
jobject jobj = value.l;
|
|
if (tos == atos && jobj != nullptr) { // null reference is allowed
|
|
Handle ob_h(current_thread, JNIHandles::resolve_external_guard(jobj));
|
|
NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT);
|
|
Klass* ob_k = ob_h()->klass();
|
|
NULL_CHECK(ob_k, JVMTI_ERROR_INVALID_OBJECT);
|
|
|
|
// Method return type signature.
|
|
char* ty_sign = 1 + strchr(signature->as_C_string(), JVM_SIGNATURE_ENDFUNC);
|
|
|
|
if (!VM_GetOrSetLocal::is_assignable(ty_sign, ob_k, current_thread)) {
|
|
return JVMTI_ERROR_TYPE_MISMATCH;
|
|
}
|
|
*ret_ob_h = ob_h;
|
|
}
|
|
return JVMTI_ERROR_NONE;
|
|
} /* end check_top_frame */
|
|
|
|
|
|
// ForceEarlyReturn<type> follows the PopFrame approach in many aspects.
|
|
// Main difference is on the last stage in the interpreter.
|
|
// The PopFrame stops method execution to continue execution
|
|
// from the same method call instruction.
|
|
// The ForceEarlyReturn forces return from method so the execution
|
|
// continues at the bytecode following the method call.
|
|
|
|
// thread - NOT protected by ThreadsListHandle and NOT pre-checked
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::force_early_return(jthread thread, jvalue value, TosState tos) {
|
|
JavaThread* current_thread = JavaThread::current();
|
|
HandleMark hm(current_thread);
|
|
|
|
JvmtiVTMSTransitionDisabler disabler(thread);
|
|
ThreadsListHandle tlh(current_thread);
|
|
|
|
JavaThread* java_thread = nullptr;
|
|
oop thread_obj = nullptr;
|
|
jvmtiError err = get_threadOop_and_JavaThread(tlh.list(), thread, &java_thread, &thread_obj);
|
|
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
return err;
|
|
}
|
|
Handle thread_handle(current_thread, thread_obj);
|
|
bool self = java_thread == current_thread;
|
|
|
|
err = check_non_suspended_or_opaque_frame(java_thread, thread_obj, self);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
return err;
|
|
}
|
|
|
|
// retrieve or create the state
|
|
JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
|
|
if (state == nullptr) {
|
|
return JVMTI_ERROR_THREAD_NOT_ALIVE;
|
|
}
|
|
|
|
// Eagerly reallocate scalar replaced objects.
|
|
EscapeBarrier eb(true, current_thread, java_thread);
|
|
if (!eb.deoptimize_objects(0)) {
|
|
// Reallocation of scalar replaced objects failed -> return with error
|
|
return JVMTI_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
MutexLocker mu(JvmtiThreadState_lock);
|
|
SetForceEarlyReturn op(state, value, tos);
|
|
JvmtiHandshake::execute(&op, &tlh, java_thread, thread_handle);
|
|
return op.result();
|
|
}
|
|
|
|
void
|
|
SetForceEarlyReturn::doit(Thread *target) {
|
|
JavaThread* java_thread = JavaThread::cast(target);
|
|
Thread* current_thread = Thread::current();
|
|
HandleMark hm(current_thread);
|
|
|
|
if (java_thread->is_exiting()) {
|
|
return; /* JVMTI_ERROR_THREAD_NOT_ALIVE (default) */
|
|
}
|
|
|
|
// Check to see if a ForceEarlyReturn was already in progress
|
|
if (_state->is_earlyret_pending()) {
|
|
// Probably possible for JVMTI clients to trigger this, but the
|
|
// JPDA backend shouldn't allow this to happen
|
|
_result = JVMTI_ERROR_INTERNAL;
|
|
return;
|
|
}
|
|
{
|
|
// The same as for PopFrame. Workaround bug:
|
|
// 4812902: popFrame hangs if the method is waiting at a synchronize
|
|
// Catch this condition and return an error to avoid hanging.
|
|
// Now JVMTI spec allows an implementation to bail out with an opaque
|
|
// frame error.
|
|
OSThread* osThread = java_thread->osthread();
|
|
if (osThread->get_state() == MONITOR_WAIT) {
|
|
_result = JVMTI_ERROR_OPAQUE_FRAME;
|
|
return;
|
|
}
|
|
}
|
|
|
|
Handle ret_ob_h;
|
|
_result = JvmtiEnvBase::check_top_frame(current_thread, java_thread, _value, _tos, &ret_ob_h);
|
|
if (_result != JVMTI_ERROR_NONE) {
|
|
return;
|
|
}
|
|
assert(_tos != atos || _value.l == nullptr || ret_ob_h() != nullptr,
|
|
"return object oop must not be null if jobject is not null");
|
|
|
|
// Update the thread state to reflect that the top frame must be
|
|
// forced to return.
|
|
// The current frame will be returned later when the suspended
|
|
// thread is resumed and right before returning from VM to Java.
|
|
// (see call_VM_base() in assembler_<cpu>.cpp).
|
|
|
|
_state->set_earlyret_pending();
|
|
_state->set_earlyret_oop(ret_ob_h());
|
|
_state->set_earlyret_value(_value, _tos);
|
|
|
|
// Set pending step flag for this early return.
|
|
// It is cleared when next step event is posted.
|
|
_state->set_pending_step_for_earlyret();
|
|
}
|
|
|
|
void
|
|
JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) {
|
|
if ( _error != JVMTI_ERROR_NONE) {
|
|
// Error occurred in previous iteration so no need to add
|
|
// to the list.
|
|
return;
|
|
}
|
|
// Filter out on stack monitors collected during stack walk.
|
|
oop obj = mon->object();
|
|
|
|
if (obj == nullptr) {
|
|
// This can happen if JNI code drops all references to the
|
|
// owning object.
|
|
return;
|
|
}
|
|
|
|
bool found = false;
|
|
for (int j = 0; j < _owned_monitors_list->length(); j++) {
|
|
jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor;
|
|
oop check = JNIHandles::resolve(jobj);
|
|
if (check == obj) {
|
|
// On stack monitor already collected during the stack walk.
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (found == false) {
|
|
// This is off stack monitor (e.g. acquired via jni MonitorEnter).
|
|
jvmtiError err;
|
|
jvmtiMonitorStackDepthInfo *jmsdi;
|
|
err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
_error = err;
|
|
return;
|
|
}
|
|
Handle hobj(Thread::current(), obj);
|
|
jmsdi->monitor = _env->jni_reference(_calling_thread, hobj);
|
|
// stack depth is unknown for this monitor.
|
|
jmsdi->stack_depth = -1;
|
|
_owned_monitors_list->append(jmsdi);
|
|
}
|
|
}
|
|
|
|
GrowableArray<OopHandle>* JvmtiModuleClosure::_tbl = nullptr;
|
|
|
|
void JvmtiModuleClosure::do_module(ModuleEntry* entry) {
|
|
assert_locked_or_safepoint(Module_lock);
|
|
OopHandle module = entry->module_handle();
|
|
guarantee(module.resolve() != nullptr, "module object is null");
|
|
_tbl->push(module);
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiModuleClosure::get_all_modules(JvmtiEnv* env, jint* module_count_ptr, jobject** modules_ptr) {
|
|
ResourceMark rm;
|
|
MutexLocker mcld(ClassLoaderDataGraph_lock);
|
|
MutexLocker ml(Module_lock);
|
|
|
|
_tbl = new GrowableArray<OopHandle>(77);
|
|
if (_tbl == nullptr) {
|
|
return JVMTI_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
// Iterate over all the modules loaded to the system.
|
|
ClassLoaderDataGraph::modules_do(&do_module);
|
|
|
|
jint len = _tbl->length();
|
|
guarantee(len > 0, "at least one module must be present");
|
|
|
|
jobject* array = (jobject*)env->jvmtiMalloc((jlong)(len * sizeof(jobject)));
|
|
if (array == nullptr) {
|
|
return JVMTI_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
for (jint idx = 0; idx < len; idx++) {
|
|
array[idx] = JNIHandles::make_local(_tbl->at(idx).resolve());
|
|
}
|
|
_tbl = nullptr;
|
|
*modules_ptr = array;
|
|
*module_count_ptr = len;
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
void
|
|
UpdateForPopTopFrameClosure::doit(Thread *target) {
|
|
Thread* current_thread = Thread::current();
|
|
HandleMark hm(current_thread);
|
|
JavaThread* java_thread = JavaThread::cast(target);
|
|
|
|
if (java_thread->is_exiting()) {
|
|
return; /* JVMTI_ERROR_THREAD_NOT_ALIVE (default) */
|
|
}
|
|
assert(java_thread == _state->get_thread(), "Must be");
|
|
|
|
// Check to see if a PopFrame was already in progress
|
|
if (java_thread->popframe_condition() != JavaThread::popframe_inactive) {
|
|
// Probably possible for JVMTI clients to trigger this, but the
|
|
// JPDA backend shouldn't allow this to happen
|
|
_result = JVMTI_ERROR_INTERNAL;
|
|
return;
|
|
}
|
|
|
|
// Was workaround bug
|
|
// 4812902: popFrame hangs if the method is waiting at a synchronize
|
|
// Catch this condition and return an error to avoid hanging.
|
|
// Now JVMTI spec allows an implementation to bail out with an opaque frame error.
|
|
OSThread* osThread = java_thread->osthread();
|
|
if (osThread->get_state() == MONITOR_WAIT) {
|
|
_result = JVMTI_ERROR_OPAQUE_FRAME;
|
|
return;
|
|
}
|
|
|
|
ResourceMark rm(current_thread);
|
|
// Check if there is more than one Java frame in this thread, that the top two frames
|
|
// are Java (not native) frames, and that there is no intervening VM frame
|
|
int frame_count = 0;
|
|
bool is_interpreted[2];
|
|
intptr_t *frame_sp[2];
|
|
// The 2-nd arg of constructor is needed to stop iterating at java entry frame.
|
|
for (vframeStream vfs(java_thread, true, false /* process_frames */); !vfs.at_end(); vfs.next()) {
|
|
methodHandle mh(current_thread, vfs.method());
|
|
if (mh->is_native()) {
|
|
_result = JVMTI_ERROR_OPAQUE_FRAME;
|
|
return;
|
|
}
|
|
is_interpreted[frame_count] = vfs.is_interpreted_frame();
|
|
frame_sp[frame_count] = vfs.frame_id();
|
|
if (++frame_count > 1) break;
|
|
}
|
|
if (frame_count < 2) {
|
|
// We haven't found two adjacent non-native Java frames on the top.
|
|
// There can be two situations here:
|
|
// 1. There are no more java frames
|
|
// 2. Two top java frames are separated by non-java native frames
|
|
if (JvmtiEnvBase::jvf_for_thread_and_depth(java_thread, 1) == nullptr) {
|
|
_result = JVMTI_ERROR_NO_MORE_FRAMES;
|
|
return;
|
|
} else {
|
|
// Intervening non-java native or VM frames separate java frames.
|
|
// Current implementation does not support this. See bug #5031735.
|
|
// In theory it is possible to pop frames in such cases.
|
|
_result = JVMTI_ERROR_OPAQUE_FRAME;
|
|
return;
|
|
}
|
|
}
|
|
|
|
// If any of the top 2 frames is a compiled one, need to deoptimize it
|
|
for (int i = 0; i < 2; i++) {
|
|
if (!is_interpreted[i]) {
|
|
Deoptimization::deoptimize_frame(java_thread, frame_sp[i]);
|
|
}
|
|
}
|
|
|
|
// Update the thread state to reflect that the top frame is popped
|
|
// so that cur_stack_depth is maintained properly and all frameIDs
|
|
// are invalidated.
|
|
// The current frame will be popped later when the suspended thread
|
|
// is resumed and right before returning from VM to Java.
|
|
// (see call_VM_base() in assembler_<cpu>.cpp).
|
|
|
|
// It's fine to update the thread state here because no JVMTI events
|
|
// shall be posted for this PopFrame.
|
|
|
|
_state->update_for_pop_top_frame();
|
|
java_thread->set_popframe_condition(JavaThread::popframe_pending_bit);
|
|
// Set pending step flag for this popframe and it is cleared when next
|
|
// step event is posted.
|
|
_state->set_pending_step_for_popframe();
|
|
_result = JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
void
|
|
SetFramePopClosure::do_thread(Thread *target) {
|
|
Thread* current = Thread::current();
|
|
ResourceMark rm(current); // vframes are resource allocated
|
|
JavaThread* java_thread = JavaThread::cast(target);
|
|
|
|
if (java_thread->is_exiting()) {
|
|
return; // JVMTI_ERROR_THREAD_NOT_ALIVE (default)
|
|
}
|
|
|
|
if (!_self && !java_thread->is_suspended()) {
|
|
_result = JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
return;
|
|
}
|
|
if (!java_thread->has_last_Java_frame()) {
|
|
_result = JVMTI_ERROR_NO_MORE_FRAMES;
|
|
return;
|
|
}
|
|
assert(_state->get_thread_or_saved() == java_thread, "Must be");
|
|
|
|
RegisterMap reg_map(java_thread,
|
|
RegisterMap::UpdateMap::include,
|
|
RegisterMap::ProcessFrames::skip,
|
|
RegisterMap::WalkContinuation::include);
|
|
javaVFrame* jvf = JvmtiEnvBase::get_cthread_last_java_vframe(java_thread, ®_map);
|
|
_result = ((JvmtiEnvBase*)_env)->set_frame_pop(_state, jvf, _depth);
|
|
}
|
|
|
|
void
|
|
SetFramePopClosure::do_vthread(Handle target_h) {
|
|
Thread* current = Thread::current();
|
|
ResourceMark rm(current); // vframes are resource allocated
|
|
|
|
if (!_self && !JvmtiVTSuspender::is_vthread_suspended(target_h())) {
|
|
_result = JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
return;
|
|
}
|
|
javaVFrame *jvf = JvmtiEnvBase::get_vthread_jvf(target_h());
|
|
_result = ((JvmtiEnvBase*)_env)->set_frame_pop(_state, jvf, _depth);
|
|
}
|
|
|
|
void
|
|
GetOwnedMonitorInfoClosure::do_thread(Thread *target) {
|
|
JavaThread *jt = JavaThread::cast(target);
|
|
if (!jt->is_exiting() && (jt->threadObj() != nullptr)) {
|
|
_result = ((JvmtiEnvBase *)_env)->get_owned_monitors(_calling_thread,
|
|
jt,
|
|
_owned_monitors_list);
|
|
}
|
|
}
|
|
|
|
void
|
|
GetOwnedMonitorInfoClosure::do_vthread(Handle target_h) {
|
|
assert(_target_jt != nullptr, "sanity check");
|
|
Thread* current = Thread::current();
|
|
ResourceMark rm(current); // vframes are resource allocated
|
|
HandleMark hm(current);
|
|
|
|
javaVFrame *jvf = JvmtiEnvBase::get_vthread_jvf(target_h());
|
|
|
|
if (!_target_jt->is_exiting() && _target_jt->threadObj() != nullptr) {
|
|
_result = ((JvmtiEnvBase *)_env)->get_owned_monitors(_calling_thread,
|
|
_target_jt,
|
|
jvf,
|
|
_owned_monitors_list);
|
|
}
|
|
}
|
|
|
|
void
|
|
GetCurrentContendedMonitorClosure::do_thread(Thread *target) {
|
|
JavaThread *jt = JavaThread::cast(target);
|
|
if (!jt->is_exiting() && (jt->threadObj() != nullptr)) {
|
|
_result = ((JvmtiEnvBase *)_env)->get_current_contended_monitor(_calling_thread,
|
|
jt,
|
|
_owned_monitor_ptr,
|
|
_is_virtual);
|
|
}
|
|
}
|
|
|
|
void
|
|
GetCurrentContendedMonitorClosure::do_vthread(Handle target_h) {
|
|
if (_target_jt == nullptr) {
|
|
_result = JVMTI_ERROR_NONE; // target virtual thread is unmounted
|
|
return;
|
|
}
|
|
// mounted virtual thread case
|
|
do_thread(_target_jt);
|
|
}
|
|
|
|
void
|
|
GetStackTraceClosure::do_thread(Thread *target) {
|
|
Thread* current = Thread::current();
|
|
ResourceMark rm(current);
|
|
|
|
JavaThread *jt = JavaThread::cast(target);
|
|
if (!jt->is_exiting() && jt->threadObj() != nullptr) {
|
|
_result = ((JvmtiEnvBase *)_env)->get_stack_trace(jt,
|
|
_start_depth, _max_count,
|
|
_frame_buffer, _count_ptr);
|
|
}
|
|
}
|
|
|
|
void
|
|
GetStackTraceClosure::do_vthread(Handle target_h) {
|
|
Thread* current = Thread::current();
|
|
ResourceMark rm(current);
|
|
|
|
javaVFrame *jvf = JvmtiEnvBase::get_vthread_jvf(target_h());
|
|
_result = ((JvmtiEnvBase *)_env)->get_stack_trace(jvf,
|
|
_start_depth, _max_count,
|
|
_frame_buffer, _count_ptr);
|
|
}
|
|
|
|
#ifdef ASSERT
|
|
void
|
|
PrintStackTraceClosure::do_thread_impl(Thread *target) {
|
|
JavaThread *java_thread = JavaThread::cast(target);
|
|
Thread *current_thread = Thread::current();
|
|
|
|
ResourceMark rm (current_thread);
|
|
const char* tname = JvmtiTrace::safe_get_thread_name(java_thread);
|
|
oop t_oop = java_thread->jvmti_vthread();
|
|
t_oop = t_oop == nullptr ? java_thread->threadObj() : t_oop;
|
|
bool is_vt_suspended = java_lang_VirtualThread::is_instance(t_oop) && JvmtiVTSuspender::is_vthread_suspended(t_oop);
|
|
|
|
log_error(jvmti)("%s(%s) exiting: %d is_susp: %d is_thread_susp: %d is_vthread_susp: %d "
|
|
"is_VTMS_transition_disabler: %d, is_in_VTMS_transition = %d\n",
|
|
tname, java_thread->name(), java_thread->is_exiting(),
|
|
java_thread->is_suspended(), java_thread->is_carrier_thread_suspended(), is_vt_suspended,
|
|
java_thread->is_VTMS_transition_disabler(), java_thread->is_in_VTMS_transition());
|
|
|
|
if (java_thread->has_last_Java_frame()) {
|
|
RegisterMap reg_map(java_thread,
|
|
RegisterMap::UpdateMap::include,
|
|
RegisterMap::ProcessFrames::include,
|
|
RegisterMap::WalkContinuation::skip);
|
|
ResourceMark rm(current_thread);
|
|
HandleMark hm(current_thread);
|
|
javaVFrame *jvf = java_thread->last_java_vframe(®_map);
|
|
while (jvf != nullptr) {
|
|
log_error(jvmti)(" %s:%d",
|
|
jvf->method()->external_name(),
|
|
jvf->method()->line_number_from_bci(jvf->bci()));
|
|
jvf = jvf->java_sender();
|
|
}
|
|
}
|
|
log_error(jvmti)("\n");
|
|
}
|
|
|
|
void
|
|
PrintStackTraceClosure::do_thread(Thread *target) {
|
|
JavaThread *java_thread = JavaThread::cast(target);
|
|
Thread *current_thread = Thread::current();
|
|
|
|
assert(SafepointSynchronize::is_at_safepoint() ||
|
|
java_thread->is_handshake_safe_for(current_thread),
|
|
"call by myself / at safepoint / at handshake");
|
|
|
|
PrintStackTraceClosure::do_thread_impl(target);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
GetFrameCountClosure::do_thread(Thread *target) {
|
|
JavaThread* jt = JavaThread::cast(target);
|
|
assert(target == jt, "just checking");
|
|
|
|
if (!jt->is_exiting() && jt->threadObj() != nullptr) {
|
|
_result = ((JvmtiEnvBase*)_env)->get_frame_count(jt, _count_ptr);
|
|
}
|
|
}
|
|
|
|
void
|
|
GetFrameCountClosure::do_vthread(Handle target_h) {
|
|
_result = ((JvmtiEnvBase*)_env)->get_frame_count(target_h(), _count_ptr);
|
|
}
|
|
|
|
void
|
|
GetFrameLocationClosure::do_thread(Thread *target) {
|
|
JavaThread *jt = JavaThread::cast(target);
|
|
assert(target == jt, "just checking");
|
|
|
|
if (!jt->is_exiting() && jt->threadObj() != nullptr) {
|
|
_result = ((JvmtiEnvBase*)_env)->get_frame_location(jt, _depth,
|
|
_method_ptr, _location_ptr);
|
|
}
|
|
}
|
|
|
|
void
|
|
GetFrameLocationClosure::do_vthread(Handle target_h) {
|
|
_result = ((JvmtiEnvBase*)_env)->get_frame_location(target_h(), _depth,
|
|
_method_ptr, _location_ptr);
|
|
}
|