1598 lines
51 KiB
C++
1598 lines
51 KiB
C++
/*
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* Copyright (c) 2003, 2019, 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/moduleEntry.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "jvmtifiles/jvmtiEnv.hpp"
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#include "memory/resourceArea.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/biasedLocking.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/jfieldIDWorkaround.hpp"
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#include "runtime/jniHandles.inline.hpp"
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#include "runtime/objectMonitor.hpp"
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#include "runtime/objectMonitor.inline.hpp"
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#include "runtime/signature.hpp"
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#include "runtime/thread.inline.hpp"
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#include "runtime/threadSMR.hpp"
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#include "runtime/vframe.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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///////////////////////////////////////////////////////////////
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//
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// JvmtiEnvBase
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//
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JvmtiEnvBase* JvmtiEnvBase::_head_environment = NULL;
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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 = NULL;
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for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
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previous_env = env;
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}
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if (previous_env == NULL) {
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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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jint 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 = NULL;
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_tag_map = NULL;
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_native_method_prefix_count = 0;
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_native_method_prefixes = NULL;
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_next = NULL;
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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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// 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 != NULL ? &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, NULL);
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JvmtiTagMap* tag_map_to_deallocate = _tag_map;
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set_tag_map(NULL);
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// A tag map can be big, deallocate it now
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if (tag_map_to_deallocate != NULL) {
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delete tag_map_to_deallocate;
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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(NULL);
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// A tag map can be big, deallocate it now
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if (tag_map_to_deallocate != NULL) {
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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 = NULL;
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JvmtiEnvBase* env = it.first();
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while (env != NULL) {
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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 == NULL) {
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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 = NULL;
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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 == NULL) {
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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 == NULL) {
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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 == NULL) {
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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 != NULL; 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 != NULL && is_valid()) {
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if (size_of_callbacks < (jint)byte_cnt) {
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byte_cnt = size_of_callbacks;
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}
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memcpy(&_event_callbacks, callbacks, byte_cnt);
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}
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}
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|
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// In the fullness of time, all users of the method should instead
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// directly use allocate, besides being cleaner and faster, this will
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// mean much better out of memory handling
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unsigned char *
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JvmtiEnvBase::jvmtiMalloc(jlong size) {
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unsigned char* mem = NULL;
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jvmtiError result = allocate(size, &mem);
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assert(result == JVMTI_ERROR_NONE, "Allocate failed");
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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
|
|
//
|
|
|
|
jobject *
|
|
JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) {
|
|
if (length == 0) {
|
|
return NULL;
|
|
}
|
|
|
|
jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length);
|
|
NULL_CHECK(objArray, NULL);
|
|
|
|
for (int i=0; i<length; i++) {
|
|
objArray[i] = jni_reference(handles[i]);
|
|
}
|
|
return objArray;
|
|
}
|
|
|
|
jthread *
|
|
JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) {
|
|
return (jthread *) new_jobjectArray(length,handles);
|
|
}
|
|
|
|
jthreadGroup *
|
|
JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) {
|
|
return (jthreadGroup *) new_jobjectArray(length,handles);
|
|
}
|
|
|
|
// return the vframe on the specified thread and depth, NULL if no such frame
|
|
vframe*
|
|
JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) {
|
|
if (!java_thread->has_last_Java_frame()) {
|
|
return NULL;
|
|
}
|
|
RegisterMap reg_map(java_thread);
|
|
vframe *vf = java_thread->last_java_vframe(®_map);
|
|
int d = 0;
|
|
while ((vf != NULL) && (d < depth)) {
|
|
vf = vf->java_sender();
|
|
d++;
|
|
}
|
|
return vf;
|
|
}
|
|
|
|
|
|
//
|
|
// utilities: JNI objects
|
|
//
|
|
|
|
|
|
jclass
|
|
JvmtiEnvBase::get_jni_class_non_null(Klass* k) {
|
|
assert(k != NULL, "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;
|
|
}
|
|
|
|
//
|
|
// 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
|
|
}
|
|
|
|
ResourceMark rm;
|
|
HandleMark hm;
|
|
RegisterMap reg_map(java_thread);
|
|
|
|
for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL;
|
|
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() != NULL && mi->owner() == hobj()) {
|
|
ret++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) {
|
|
#ifdef ASSERT
|
|
uint32_t debug_bits = 0;
|
|
#endif
|
|
assert((SafepointSynchronize::is_at_safepoint() ||
|
|
java_thread->is_thread_fully_suspended(false, &debug_bits)),
|
|
"at safepoint or target thread is suspended");
|
|
oop obj = NULL;
|
|
ObjectMonitor *mon = java_thread->current_waiting_monitor();
|
|
if (mon == NULL) {
|
|
// thread is not doing an Object.wait() call
|
|
mon = java_thread->current_pending_monitor();
|
|
if (mon != NULL) {
|
|
// The thread is trying to enter() or raw_enter() an ObjectMonitor.
|
|
obj = (oop)mon->object();
|
|
// If obj == NULL, then ObjectMonitor is raw which doesn't count
|
|
// as contended for this API
|
|
}
|
|
// implied else: no contended ObjectMonitor
|
|
} else {
|
|
// thread is doing an Object.wait() call
|
|
obj = (oop)mon->object();
|
|
assert(obj != NULL, "Object.wait() should have an object");
|
|
}
|
|
|
|
if (obj == NULL) {
|
|
*monitor_ptr = NULL;
|
|
} else {
|
|
HandleMark hm;
|
|
Handle hobj(Thread::current(), 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) {
|
|
jvmtiError err = JVMTI_ERROR_NONE;
|
|
#ifdef ASSERT
|
|
uint32_t debug_bits = 0;
|
|
#endif
|
|
assert((SafepointSynchronize::is_at_safepoint() ||
|
|
java_thread->is_thread_fully_suspended(false, &debug_bits)),
|
|
"at safepoint or target thread is suspended");
|
|
|
|
if (java_thread->has_last_Java_frame()) {
|
|
ResourceMark rm;
|
|
HandleMark hm;
|
|
RegisterMap reg_map(java_thread);
|
|
|
|
int depth = 0;
|
|
for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL;
|
|
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(java_thread, calling_thread, owned_monitors_list, this);
|
|
ObjectSynchronizer::monitors_iterate(&jmc);
|
|
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;
|
|
ResourceMark rm;
|
|
|
|
GrowableArray<MonitorInfo*>* mons = jvf->monitors();
|
|
if (mons->is_empty()) {
|
|
return err; // this javaVFrame holds no monitors
|
|
}
|
|
|
|
HandleMark hm;
|
|
oop wait_obj = NULL;
|
|
{
|
|
// save object of current wait() call (if any) for later comparison
|
|
ObjectMonitor *mon = java_thread->current_waiting_monitor();
|
|
if (mon != NULL) {
|
|
wait_obj = (oop)mon->object();
|
|
}
|
|
}
|
|
oop pending_obj = NULL;
|
|
{
|
|
// save object of current enter() call (if any) for later comparison
|
|
ObjectMonitor *mon = java_thread->current_pending_monitor();
|
|
if (mon != NULL) {
|
|
pending_obj = (oop)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 == NULL) {
|
|
// 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(JavaThread *java_thread,
|
|
jint start_depth, jint max_count,
|
|
jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
|
|
#ifdef ASSERT
|
|
uint32_t debug_bits = 0;
|
|
#endif
|
|
assert((SafepointSynchronize::is_at_safepoint() ||
|
|
java_thread->is_thread_fully_suspended(false, &debug_bits)),
|
|
"at safepoint or target thread is suspended");
|
|
int count = 0;
|
|
if (java_thread->has_last_Java_frame()) {
|
|
RegisterMap reg_map(java_thread);
|
|
Thread* current_thread = Thread::current();
|
|
ResourceMark rm(current_thread);
|
|
javaVFrame *jvf = java_thread->last_java_vframe(®_map);
|
|
HandleMark hm(current_thread);
|
|
if (start_depth != 0) {
|
|
if (start_depth > 0) {
|
|
for (int j = 0; j < start_depth && jvf != NULL; j++) {
|
|
jvf = jvf->java_sender();
|
|
}
|
|
if (jvf == NULL) {
|
|
// 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 = NULL;
|
|
javaVFrame *jvf_prev_prev = NULL;
|
|
int j = 0;
|
|
while (jvf_cursor != NULL) {
|
|
jvf_prev_prev = jvf_prev;
|
|
jvf_prev = jvf_cursor;
|
|
for (j = 0; j > start_depth && jvf_cursor != NULL; 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 == NULL) {
|
|
// the -start_depth is greater than the stack depth
|
|
return JVMTI_ERROR_ILLEGAL_ARGUMENT;
|
|
}
|
|
// j now is 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, the result is -start_depth frames
|
|
// remaining.
|
|
jvf = jvf_prev_prev;
|
|
for (; j < 0; j++) {
|
|
jvf = jvf->java_sender();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
for (; count < max_count && jvf != NULL; count++) {
|
|
frame_buffer[count].method = jvf->method()->jmethod_id();
|
|
frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci());
|
|
jvf = jvf->java_sender();
|
|
}
|
|
} else {
|
|
if (start_depth != 0) {
|
|
// no frames and there is a starting depth
|
|
return JVMTI_ERROR_ILLEGAL_ARGUMENT;
|
|
}
|
|
}
|
|
*count_ptr = count;
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) {
|
|
assert((state != NULL),
|
|
"JavaThread should create JvmtiThreadState before calling this method");
|
|
*count_ptr = state->count_frames();
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth,
|
|
jmethodID* method_ptr, jlocation* location_ptr) {
|
|
#ifdef ASSERT
|
|
uint32_t debug_bits = 0;
|
|
#endif
|
|
assert((SafepointSynchronize::is_at_safepoint() ||
|
|
java_thread->is_thread_fully_suspended(false, &debug_bits)),
|
|
"at safepoint or target thread is suspended");
|
|
Thread* current_thread = Thread::current();
|
|
ResourceMark rm(current_thread);
|
|
|
|
vframe *vf = vframeFor(java_thread, depth);
|
|
if (vf == NULL) {
|
|
return JVMTI_ERROR_NO_MORE_FRAMES;
|
|
}
|
|
|
|
// vframeFor should return a java frame. If it doesn't
|
|
// it means we've got an internal error and we return the
|
|
// error in product mode. In debug mode we will instead
|
|
// attempt to cast the vframe to a javaVFrame and will
|
|
// cause an assertion/crash to allow further diagnosis.
|
|
#ifdef PRODUCT
|
|
if (!vf->is_java_frame()) {
|
|
return JVMTI_ERROR_INTERNAL;
|
|
}
|
|
#endif
|
|
|
|
HandleMark hm(current_thread);
|
|
javaVFrame *jvf = javaVFrame::cast(vf);
|
|
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_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) {
|
|
HandleMark hm;
|
|
Handle hobj;
|
|
|
|
Thread* current_thread = Thread::current();
|
|
bool at_safepoint = SafepointSynchronize::is_at_safepoint();
|
|
|
|
// 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);
|
|
}
|
|
|
|
JavaThread *owning_thread = NULL;
|
|
ObjectMonitor *mon = NULL;
|
|
jvmtiMonitorUsage ret = {
|
|
NULL, 0, 0, NULL, 0, NULL
|
|
};
|
|
|
|
uint32_t debug_bits = 0;
|
|
// first derive the object's owner and entry_count (if any)
|
|
{
|
|
// Revoke any biases before querying the mark word
|
|
if (at_safepoint) {
|
|
BiasedLocking::revoke_at_safepoint(hobj);
|
|
} else {
|
|
BiasedLocking::revoke_and_rebias(hobj, false, calling_thread);
|
|
}
|
|
|
|
address owner = NULL;
|
|
{
|
|
markOop mark = hobj()->mark();
|
|
|
|
if (!mark->has_monitor()) {
|
|
// this object has a lightweight monitor
|
|
|
|
if (mark->has_locker()) {
|
|
owner = (address)mark->locker(); // save the address of the Lock word
|
|
}
|
|
// implied else: no owner
|
|
} else {
|
|
// this object has a heavyweight monitor
|
|
mon = mark->monitor();
|
|
|
|
// The owner field of a heavyweight monitor may be NULL for no
|
|
// owner, a JavaThread * or it may still be the address of the
|
|
// Lock word in a JavaThread's stack. A monitor can be inflated
|
|
// by a non-owning JavaThread, but only the owning JavaThread
|
|
// can change the owner field from the Lock word to the
|
|
// JavaThread * and it may not have done that yet.
|
|
owner = (address)mon->owner();
|
|
}
|
|
}
|
|
|
|
if (owner != NULL) {
|
|
// Use current thread since function can be called from a
|
|
// JavaThread or the VMThread.
|
|
ThreadsListHandle tlh;
|
|
// This monitor is owned so we have to find the owning JavaThread.
|
|
owning_thread = Threads::owning_thread_from_monitor_owner(tlh.list(), owner);
|
|
// Cannot assume (owning_thread != NULL) here because this function
|
|
// may not have been called at a safepoint and the owning_thread
|
|
// might not be suspended.
|
|
if (owning_thread != NULL) {
|
|
// The monitor's owner either has to be the current thread, at safepoint
|
|
// or it has to be suspended. Any of these conditions will prevent both
|
|
// contending and waiting threads from modifying the state of
|
|
// the monitor.
|
|
if (!at_safepoint && !owning_thread->is_thread_fully_suspended(true, &debug_bits)) {
|
|
// Don't worry! This return of JVMTI_ERROR_THREAD_NOT_SUSPENDED
|
|
// will not make it back to the JVM/TI agent. The error code will
|
|
// get intercepted in JvmtiEnv::GetObjectMonitorUsage() which
|
|
// will retry the call via a VM_GetObjectMonitorUsage VM op.
|
|
return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
}
|
|
HandleMark hm;
|
|
Handle th(current_thread, owning_thread->threadObj());
|
|
ret.owner = (jthread)jni_reference(calling_thread, th);
|
|
}
|
|
// implied else: no owner
|
|
} // ThreadsListHandle is destroyed here.
|
|
|
|
if (owning_thread != NULL) { // monitor is owned
|
|
// 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.
|
|
ResourceMark rm;
|
|
ret.entry_count = count_locked_objects(owning_thread, hobj);
|
|
}
|
|
// implied else: entry_count == 0
|
|
}
|
|
|
|
jint nWant = 0, nWait = 0;
|
|
if (mon != NULL) {
|
|
// this object has a heavyweight monitor
|
|
nWant = mon->contentions(); // # of threads contending for monitor
|
|
nWait = mon->waiters(); // # of threads in Object.wait()
|
|
ret.waiter_count = nWant + nWait;
|
|
ret.notify_waiter_count = nWait;
|
|
} else {
|
|
// this object has a lightweight monitor
|
|
ret.waiter_count = 0;
|
|
ret.notify_waiter_count = 0;
|
|
}
|
|
|
|
// 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 != NULL) {
|
|
// this object has a heavyweight monitor
|
|
|
|
// Number of waiters may actually be less than the waiter count.
|
|
// So NULL out memory so that unused memory will be NULL.
|
|
memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *));
|
|
memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *));
|
|
|
|
if (ret.waiter_count > 0) {
|
|
// we have contending and/or waiting threads
|
|
HandleMark hm;
|
|
// Use current thread since function can be called from a
|
|
// JavaThread or the VMThread.
|
|
ThreadsListHandle tlh;
|
|
if (nWant > 0) {
|
|
// we have contending threads
|
|
ResourceMark rm;
|
|
// get_pending_threads returns only java thread so we do not need to
|
|
// check for non java threads.
|
|
GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads(tlh.list(), nWant, (address)mon);
|
|
if (wantList->length() < nWant) {
|
|
// robustness: the pending list has gotten smaller
|
|
nWant = wantList->length();
|
|
}
|
|
for (int i = 0; i < nWant; i++) {
|
|
JavaThread *pending_thread = wantList->at(i);
|
|
// If the monitor has no owner, then a non-suspended contending
|
|
// thread could potentially change the state of the monitor by
|
|
// entering it. The JVM/TI spec doesn't allow this.
|
|
if (owning_thread == NULL && !at_safepoint &&
|
|
!pending_thread->is_thread_fully_suspended(true, &debug_bits)) {
|
|
if (ret.owner != NULL) {
|
|
destroy_jni_reference(calling_thread, ret.owner);
|
|
}
|
|
for (int j = 0; j < i; j++) {
|
|
destroy_jni_reference(calling_thread, ret.waiters[j]);
|
|
}
|
|
deallocate((unsigned char*)ret.waiters);
|
|
deallocate((unsigned char*)ret.notify_waiters);
|
|
return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
}
|
|
Handle th(current_thread, pending_thread->threadObj());
|
|
ret.waiters[i] = (jthread)jni_reference(calling_thread, th);
|
|
}
|
|
}
|
|
if (nWait > 0) {
|
|
// we have threads in Object.wait()
|
|
int offset = nWant; // add after any contending threads
|
|
ObjectWaiter *waiter = mon->first_waiter();
|
|
for (int i = 0, j = 0; i < nWait; i++) {
|
|
if (waiter == NULL) {
|
|
// robustness: the waiting list has gotten smaller
|
|
nWait = j;
|
|
break;
|
|
}
|
|
Thread *t = mon->thread_of_waiter(waiter);
|
|
if (t != NULL && t->is_Java_thread()) {
|
|
JavaThread *wjava_thread = (JavaThread *)t;
|
|
// If the thread was found on the ObjectWaiter list, then
|
|
// it has not been notified. This thread can't change the
|
|
// state of the monitor so it doesn't need to be suspended.
|
|
Handle th(current_thread, wjava_thread->threadObj());
|
|
ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th);
|
|
ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th);
|
|
}
|
|
waiter = mon->next_waiter(waiter);
|
|
}
|
|
}
|
|
} // ThreadsListHandle is destroyed here.
|
|
|
|
// Adjust count. nWant and nWait count values may be less than original.
|
|
ret.waiter_count = nWant + nWait;
|
|
ret.notify_waiter_count = nWait;
|
|
} 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;
|
|
}
|
|
|
|
ResourceTracker::ResourceTracker(JvmtiEnv* env) {
|
|
_env = env;
|
|
_allocations = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<unsigned char*>(20, true);
|
|
_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 = NULL;
|
|
_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 != NULL) {
|
|
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
|
|
VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) {
|
|
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
|
|
|
|
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->thread = jt;
|
|
|
|
if (thread_oop != NULL) {
|
|
// get most state bits
|
|
state = (jint)java_lang_Thread::get_thread_status(thread_oop);
|
|
}
|
|
|
|
if (thr != NULL) { // add more state bits if there is a JavaThead to query
|
|
// same as is_being_ext_suspended() but without locking
|
|
if (thr->is_ext_suspended() || thr->is_external_suspend()) {
|
|
state |= JVMTI_THREAD_STATE_SUSPENDED;
|
|
}
|
|
JavaThreadState jts = thr->thread_state();
|
|
if (jts == _thread_in_native) {
|
|
state |= JVMTI_THREAD_STATE_IN_NATIVE;
|
|
}
|
|
OSThread* osThread = thr->osthread();
|
|
if (osThread != NULL && osThread->interrupted()) {
|
|
state |= JVMTI_THREAD_STATE_INTERRUPTED;
|
|
}
|
|
}
|
|
infop->state = state;
|
|
|
|
if (thr != NULL && (state & JVMTI_THREAD_STATE_ALIVE) != 0) {
|
|
infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count());
|
|
env()->get_stack_trace(thr, 0, max_frame_count(),
|
|
infop->frame_buffer, &(infop->frame_count));
|
|
} else {
|
|
infop->frame_buffer = NULL;
|
|
infop->frame_count = 0;
|
|
}
|
|
_frame_count_total += infop->frame_count;
|
|
}
|
|
|
|
// 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
|
|
VM_GetMultipleStackTraces::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 != NULL; 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 = NULL;
|
|
} 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");
|
|
}
|
|
|
|
|
|
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 = NULL;
|
|
oop thread_oop = NULL;
|
|
jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), jt, &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.
|
|
if (thread_oop == NULL) {
|
|
set_result(err);
|
|
return;
|
|
}
|
|
// We have a valid thread_oop.
|
|
}
|
|
fill_frames(jt, java_thread, thread_oop);
|
|
}
|
|
allocate_and_fill_stacks(_thread_count);
|
|
}
|
|
|
|
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 != NULL &&
|
|
!jt->is_exiting() &&
|
|
java_lang_Thread::is_alive(thread_oop) &&
|
|
!jt->is_hidden_from_external_view()) {
|
|
++_final_thread_count;
|
|
// Handle block of the calling thread is used to create local refs.
|
|
fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop),
|
|
jt, thread_oop);
|
|
}
|
|
}
|
|
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(JavaThread* current_thread, JavaThread* java_thread,
|
|
jvalue value, TosState tos, Handle* ret_ob_h) {
|
|
ResourceMark rm(current_thread);
|
|
|
|
vframe *vf = vframeFor(java_thread, 0);
|
|
NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES);
|
|
|
|
javaVFrame *jvf = (javaVFrame*) vf;
|
|
if (!vf->is_java_frame() || jvf->method()->is_native()) {
|
|
return JVMTI_ERROR_OPAQUE_FRAME;
|
|
}
|
|
|
|
// If the frame is a compiled one, need to deoptimize it.
|
|
if (vf->is_compiled_frame()) {
|
|
if (!vf->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 != NULL) { // 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(), ')');
|
|
|
|
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.
|
|
|
|
// Threads_lock NOT held, java_thread not protected by lock
|
|
// java_thread - pre-checked
|
|
|
|
jvmtiError
|
|
JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) {
|
|
JavaThread* current_thread = JavaThread::current();
|
|
HandleMark hm(current_thread);
|
|
uint32_t debug_bits = 0;
|
|
|
|
// retrieve or create the state
|
|
JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
|
|
if (state == NULL) {
|
|
return JVMTI_ERROR_THREAD_NOT_ALIVE;
|
|
}
|
|
|
|
// Check if java_thread is fully suspended
|
|
if (!java_thread->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
|
|
return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
}
|
|
|
|
// 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
|
|
return JVMTI_ERROR_INTERNAL;
|
|
}
|
|
{
|
|
// 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) {
|
|
return JVMTI_ERROR_OPAQUE_FRAME;
|
|
}
|
|
}
|
|
Handle ret_ob_h;
|
|
jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
return err;
|
|
}
|
|
assert(tos != atos || value.l == NULL || ret_ob_h() != NULL,
|
|
"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();
|
|
|
|
return JVMTI_ERROR_NONE;
|
|
} /* end force_early_return */
|
|
|
|
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;
|
|
}
|
|
if (mon->owner() == _java_thread ) {
|
|
// Filter out on stack monitors collected during stack walk.
|
|
oop obj = (oop)mon->object();
|
|
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 = NULL;
|
|
|
|
void JvmtiModuleClosure::do_module(ModuleEntry* entry) {
|
|
assert_locked_or_safepoint(Module_lock);
|
|
OopHandle module = entry->module_handle();
|
|
guarantee(module.resolve() != NULL, "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 == NULL) {
|
|
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 == NULL) {
|
|
return JVMTI_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
for (jint idx = 0; idx < len; idx++) {
|
|
array[idx] = JNIHandles::make_local(Thread::current(), _tbl->at(idx).resolve());
|
|
}
|
|
_tbl = NULL;
|
|
*modules_ptr = array;
|
|
*module_count_ptr = len;
|
|
return JVMTI_ERROR_NONE;
|
|
}
|
|
|
|
void
|
|
VM_UpdateForPopTopFrame::doit() {
|
|
JavaThread* jt = _state->get_thread();
|
|
ThreadsListHandle tlh;
|
|
if (jt != NULL && tlh.includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
|
|
_state->update_for_pop_top_frame();
|
|
} else {
|
|
_result = JVMTI_ERROR_THREAD_NOT_ALIVE;
|
|
}
|
|
}
|
|
|
|
void
|
|
VM_SetFramePop::doit() {
|
|
JavaThread* jt = _state->get_thread();
|
|
ThreadsListHandle tlh;
|
|
if (jt != NULL && tlh.includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
|
|
int frame_number = _state->count_frames() - _depth;
|
|
_state->env_thread_state((JvmtiEnvBase*)_env)->set_frame_pop(frame_number);
|
|
} else {
|
|
_result = JVMTI_ERROR_THREAD_NOT_ALIVE;
|
|
}
|
|
}
|
|
|
|
void
|
|
VM_GetOwnedMonitorInfo::doit() {
|
|
_result = JVMTI_ERROR_THREAD_NOT_ALIVE;
|
|
ThreadsListHandle tlh;
|
|
if (_java_thread != NULL && tlh.includes(_java_thread)
|
|
&& !_java_thread->is_exiting() && _java_thread->threadObj() != NULL) {
|
|
_result = ((JvmtiEnvBase *)_env)->get_owned_monitors(_calling_thread, _java_thread,
|
|
_owned_monitors_list);
|
|
}
|
|
}
|
|
|
|
void
|
|
VM_GetCurrentContendedMonitor::doit() {
|
|
_result = JVMTI_ERROR_THREAD_NOT_ALIVE;
|
|
ThreadsListHandle tlh;
|
|
if (_java_thread != NULL && tlh.includes(_java_thread)
|
|
&& !_java_thread->is_exiting() && _java_thread->threadObj() != NULL) {
|
|
_result = ((JvmtiEnvBase *)_env)->get_current_contended_monitor(_calling_thread,_java_thread,_owned_monitor_ptr);
|
|
}
|
|
}
|
|
|
|
void
|
|
VM_GetStackTrace::doit() {
|
|
_result = JVMTI_ERROR_THREAD_NOT_ALIVE;
|
|
ThreadsListHandle tlh;
|
|
if (_java_thread != NULL && tlh.includes(_java_thread)
|
|
&& !_java_thread->is_exiting() && _java_thread->threadObj() != NULL) {
|
|
_result = ((JvmtiEnvBase *)_env)->get_stack_trace(_java_thread,
|
|
_start_depth, _max_count,
|
|
_frame_buffer, _count_ptr);
|
|
}
|
|
}
|
|
|
|
void
|
|
VM_GetFrameCount::doit() {
|
|
_result = JVMTI_ERROR_THREAD_NOT_ALIVE;
|
|
JavaThread* jt = _state->get_thread();
|
|
ThreadsListHandle tlh;
|
|
if (jt != NULL && tlh.includes(jt) && !jt->is_exiting() && jt->threadObj() != NULL) {
|
|
_result = ((JvmtiEnvBase*)_env)->get_frame_count(_state, _count_ptr);
|
|
}
|
|
}
|
|
|
|
void
|
|
VM_GetFrameLocation::doit() {
|
|
_result = JVMTI_ERROR_THREAD_NOT_ALIVE;
|
|
ThreadsListHandle tlh;
|
|
if (_java_thread != NULL && tlh.includes(_java_thread)
|
|
&& !_java_thread->is_exiting() && _java_thread->threadObj() != NULL) {
|
|
_result = ((JvmtiEnvBase*)_env)->get_frame_location(_java_thread, _depth,
|
|
_method_ptr, _location_ptr);
|
|
}
|
|
}
|