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/*
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* Copyright 2005-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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# include "incls/_precompiled.incl"
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# include "incls/_attachListener.cpp.incl"
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volatile bool AttachListener::_initialized;
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// Implementation of "properties" command.
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//
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// Invokes sun.misc.VMSupport.serializePropertiesToByteArray to serialize
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// the system properties into a byte array.
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static klassOop load_and_initialize_klass(symbolHandle sh, TRAPS) {
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klassOop k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
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instanceKlassHandle ik (THREAD, k);
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if (ik->should_be_initialized()) {
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ik->initialize(CHECK_NULL);
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}
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return ik();
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}
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static jint get_properties(AttachOperation* op, outputStream* out, symbolHandle serializePropertiesMethod) {
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Thread* THREAD = Thread::current();
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HandleMark hm;
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// load sun.misc.VMSupport
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symbolHandle klass = vmSymbolHandles::sun_misc_VMSupport();
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klassOop k = load_and_initialize_klass(klass, THREAD);
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if (HAS_PENDING_EXCEPTION) {
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java_lang_Throwable::print(PENDING_EXCEPTION, out);
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CLEAR_PENDING_EXCEPTION;
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return JNI_ERR;
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}
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instanceKlassHandle ik(THREAD, k);
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// invoke the serializePropertiesToByteArray method
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JavaValue result(T_OBJECT);
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JavaCallArguments args;
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symbolHandle signature = vmSymbolHandles::serializePropertiesToByteArray_signature();
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JavaCalls::call_static(&result,
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ik,
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serializePropertiesMethod,
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signature,
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&args,
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THREAD);
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if (HAS_PENDING_EXCEPTION) {
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java_lang_Throwable::print(PENDING_EXCEPTION, out);
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CLEAR_PENDING_EXCEPTION;
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return JNI_ERR;
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}
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// The result should be a [B
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oop res = (oop)result.get_jobject();
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assert(res->is_typeArray(), "just checking");
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assert(typeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "just checking");
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// copy the bytes to the output stream
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typeArrayOop ba = typeArrayOop(res);
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jbyte* addr = typeArrayOop(res)->byte_at_addr(0);
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out->print_raw((const char*)addr, ba->length());
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return JNI_OK;
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}
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// Implementation of "properties" command.
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static jint get_system_properties(AttachOperation* op, outputStream* out) {
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return get_properties(op, out, vmSymbolHandles::serializePropertiesToByteArray_name());
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}
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// Implementation of "agent_properties" command.
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static jint get_agent_properties(AttachOperation* op, outputStream* out) {
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return get_properties(op, out, vmSymbolHandles::serializeAgentPropertiesToByteArray_name());
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}
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// Implementation of "datadump" command.
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//
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// Raises a SIGBREAK signal so that VM dump threads, does deadlock detection,
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// etc. In theory this command should only post a DataDumpRequest to any
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// JVMTI environment that has enabled this event. However it's useful to
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// trigger the SIGBREAK handler.
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static jint data_dump(AttachOperation* op, outputStream* out) {
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if (!ReduceSignalUsage) {
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AttachListener::pd_data_dump();
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} else {
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if (JvmtiExport::should_post_data_dump()) {
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JvmtiExport::post_data_dump();
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}
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}
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return JNI_OK;
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}
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// Implementation of "threaddump" command - essentially a remote ctrl-break
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//
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static jint thread_dump(AttachOperation* op, outputStream* out) {
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bool print_concurrent_locks = false;
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if (op->arg(0) != NULL && strcmp(op->arg(0), "-l") == 0) {
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print_concurrent_locks = true;
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}
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// thread stacks
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VM_PrintThreads op1(out, print_concurrent_locks);
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VMThread::execute(&op1);
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// JNI global handles
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VM_PrintJNI op2(out);
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VMThread::execute(&op2);
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// Deadlock detection
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VM_FindDeadlocks op3(out);
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VMThread::execute(&op3);
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return JNI_OK;
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}
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#ifndef SERVICES_KERNEL // Heap dumping not supported
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// Implementation of "dumpheap" command.
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//
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// Input arguments :-
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// arg0: Name of the dump file
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// arg1: "-live" or "-all"
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jint dump_heap(AttachOperation* op, outputStream* out) {
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const char* path = op->arg(0);
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if (path == NULL || path[0] == '\0') {
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out->print_cr("No dump file specified");
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} else {
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bool live_objects_only = true; // default is true to retain the behavior before this change is made
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const char* arg1 = op->arg(1);
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if (arg1 != NULL && (strlen(arg1) > 0)) {
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if (strcmp(arg1, "-all") != 0 && strcmp(arg1, "-live") != 0) {
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out->print_cr("Invalid argument to dumpheap operation: %s", arg1);
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return JNI_ERR;
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}
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live_objects_only = strcmp(arg1, "-live") == 0;
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}
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// Request a full GC before heap dump if live_objects_only = true
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// This helps reduces the amount of unreachable objects in the dump
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// and makes it easier to browse.
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HeapDumper dumper(live_objects_only /* request GC */);
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int res = dumper.dump(op->arg(0));
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if (res == 0) {
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out->print_cr("Heap dump file created");
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} else {
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// heap dump failed
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ResourceMark rm;
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char* error = dumper.error_as_C_string();
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if (error == NULL) {
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out->print_cr("Dump failed - reason unknown");
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} else {
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out->print_cr("%s", error);
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}
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}
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}
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return JNI_OK;
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}
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#endif // SERVICES_KERNEL
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// Implementation of "inspectheap" command
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//
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// Input arguments :-
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// arg0: "-live" or "-all"
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static jint heap_inspection(AttachOperation* op, outputStream* out) {
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bool live_objects_only = true; // default is true to retain the behavior before this change is made
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const char* arg0 = op->arg(0);
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if (arg0 != NULL && (strlen(arg0) > 0)) {
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if (strcmp(arg0, "-all") != 0 && strcmp(arg0, "-live") != 0) {
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out->print_cr("Invalid argument to inspectheap operation: %s", arg0);
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return JNI_ERR;
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}
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live_objects_only = strcmp(arg0, "-live") == 0;
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}
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VM_GC_HeapInspection heapop(out, live_objects_only /* request gc */);
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VMThread::execute(&heapop);
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return JNI_OK;
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}
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// set a boolean global flag using value from AttachOperation
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static jint set_bool_flag(const char* name, AttachOperation* op, outputStream* out) {
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bool value = true;
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const char* arg1;
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if ((arg1 = op->arg(1)) != NULL) {
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int tmp;
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int n = sscanf(arg1, "%d", &tmp);
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if (n != 1) {
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out->print_cr("flag value has to be boolean (1 or 0)");
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return JNI_ERR;
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}
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value = (tmp != 0);
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}
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bool res = CommandLineFlags::boolAtPut((char*)name, &value, ATTACH_ON_DEMAND);
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if (! res) {
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out->print_cr("setting flag %s failed", name);
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}
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return res? JNI_OK : JNI_ERR;
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}
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// set a intx global flag using value from AttachOperation
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static jint set_intx_flag(const char* name, AttachOperation* op, outputStream* out) {
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intx value;
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const char* arg1;
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if ((arg1 = op->arg(1)) != NULL) {
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int n = sscanf(arg1, INTX_FORMAT, &value);
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if (n != 1) {
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out->print_cr("flag value has to be integer");
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return JNI_ERR;
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}
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}
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bool res = CommandLineFlags::intxAtPut((char*)name, &value, ATTACH_ON_DEMAND);
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if (! res) {
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out->print_cr("setting flag %s failed", name);
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}
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return res? JNI_OK : JNI_ERR;
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}
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// set a uintx global flag using value from AttachOperation
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static jint set_uintx_flag(const char* name, AttachOperation* op, outputStream* out) {
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uintx value;
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const char* arg1;
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if ((arg1 = op->arg(1)) != NULL) {
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int n = sscanf(arg1, UINTX_FORMAT, &value);
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if (n != 1) {
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out->print_cr("flag value has to be integer");
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return JNI_ERR;
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}
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}
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bool res = CommandLineFlags::uintxAtPut((char*)name, &value, ATTACH_ON_DEMAND);
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if (! res) {
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out->print_cr("setting flag %s failed", name);
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}
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return res? JNI_OK : JNI_ERR;
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}
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// set a string global flag using value from AttachOperation
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static jint set_ccstr_flag(const char* name, AttachOperation* op, outputStream* out) {
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const char* value;
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if ((value = op->arg(1)) == NULL) {
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out->print_cr("flag value has to be a string");
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return JNI_ERR;
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}
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bool res = CommandLineFlags::ccstrAtPut((char*)name, &value, ATTACH_ON_DEMAND);
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if (res) {
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FREE_C_HEAP_ARRAY(char, value);
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} else {
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out->print_cr("setting flag %s failed", name);
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}
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return res? JNI_OK : JNI_ERR;
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}
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// Implementation of "setflag" command
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static jint set_flag(AttachOperation* op, outputStream* out) {
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const char* name = NULL;
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if ((name = op->arg(0)) == NULL) {
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out->print_cr("flag name is missing");
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return JNI_ERR;
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}
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Flag* f = Flag::find_flag((char*)name, strlen(name));
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if (f && f->is_external() && f->is_writeable()) {
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if (f->is_bool()) {
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return set_bool_flag(name, op, out);
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} else if (f->is_intx()) {
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return set_intx_flag(name, op, out);
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} else if (f->is_uintx()) {
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return set_uintx_flag(name, op, out);
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} else if (f->is_ccstr()) {
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return set_ccstr_flag(name, op, out);
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} else {
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ShouldNotReachHere();
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return JNI_ERR;
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}
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} else {
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return AttachListener::pd_set_flag(op, out);
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}
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}
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// Implementation of "printflag" command
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static jint print_flag(AttachOperation* op, outputStream* out) {
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const char* name = NULL;
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if ((name = op->arg(0)) == NULL) {
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out->print_cr("flag name is missing");
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return JNI_ERR;
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}
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Flag* f = Flag::find_flag((char*)name, strlen(name));
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if (f) {
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f->print_as_flag(out);
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out->print_cr("");
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} else {
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out->print_cr("no such flag '%s'", name);
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}
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return JNI_OK;
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}
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// Table to map operation names to functions.
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// names must be of length <= AttachOperation::name_length_max
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static AttachOperationFunctionInfo funcs[] = {
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{ "agentProperties", get_agent_properties },
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{ "datadump", data_dump },
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#ifndef SERVICES_KERNEL
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{ "dumpheap", dump_heap },
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#endif // SERVICES_KERNEL
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{ "load", JvmtiExport::load_agent_library },
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{ "properties", get_system_properties },
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{ "threaddump", thread_dump },
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{ "inspectheap", heap_inspection },
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{ "setflag", set_flag },
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{ "printflag", print_flag },
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{ NULL, NULL }
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};
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// The Attach Listener threads services a queue. It dequeues an operation
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// from the queue, examines the operation name (command), and dispatches
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// to the corresponding function to perform the operation.
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static void attach_listener_thread_entry(JavaThread* thread, TRAPS) {
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os::set_priority(thread, NearMaxPriority);
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if (AttachListener::pd_init() != 0) {
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return;
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}
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AttachListener::set_initialized();
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for (;;) {
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AttachOperation* op = AttachListener::dequeue();
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if (op == NULL) {
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return; // dequeue failed or shutdown
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}
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ResourceMark rm;
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bufferedStream st;
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jint res = JNI_OK;
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// handle special detachall operation
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if (strcmp(op->name(), AttachOperation::detachall_operation_name()) == 0) {
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AttachListener::detachall();
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} else {
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// find the function to dispatch too
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AttachOperationFunctionInfo* info = NULL;
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for (int i=0; funcs[i].name != NULL; i++) {
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const char* name = funcs[i].name;
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assert(strlen(name) <= AttachOperation::name_length_max, "operation <= name_length_max");
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if (strcmp(op->name(), name) == 0) {
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info = &(funcs[i]);
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break;
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}
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}
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// check for platform dependent attach operation
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if (info == NULL) {
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info = AttachListener::pd_find_operation(op->name());
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}
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if (info != NULL) {
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// dispatch to the function that implements this operation
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res = (info->func)(op, &st);
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} else {
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st.print("Operation %s not recognized!", op->name());
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res = JNI_ERR;
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}
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}
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// operation complete - send result and output to client
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op->complete(res, &st);
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}
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}
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// Starts the Attach Listener thread
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void AttachListener::init() {
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EXCEPTION_MARK;
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klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK);
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instanceKlassHandle klass (THREAD, k);
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403 |
instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
|
|
404 |
|
|
405 |
const char thread_name[] = "Attach Listener";
|
|
406 |
Handle string = java_lang_String::create_from_str(thread_name, CHECK);
|
|
407 |
|
|
408 |
// Initialize thread_oop to put it into the system threadGroup
|
|
409 |
Handle thread_group (THREAD, Universe::system_thread_group());
|
|
410 |
JavaValue result(T_VOID);
|
|
411 |
JavaCalls::call_special(&result, thread_oop,
|
|
412 |
klass,
|
|
413 |
vmSymbolHandles::object_initializer_name(),
|
|
414 |
vmSymbolHandles::threadgroup_string_void_signature(),
|
|
415 |
thread_group,
|
|
416 |
string,
|
|
417 |
CHECK);
|
|
418 |
|
|
419 |
KlassHandle group(THREAD, SystemDictionary::threadGroup_klass());
|
|
420 |
JavaCalls::call_special(&result,
|
|
421 |
thread_group,
|
|
422 |
group,
|
|
423 |
vmSymbolHandles::add_method_name(),
|
|
424 |
vmSymbolHandles::thread_void_signature(),
|
|
425 |
thread_oop, // ARG 1
|
|
426 |
CHECK);
|
|
427 |
|
|
428 |
{ MutexLocker mu(Threads_lock);
|
|
429 |
JavaThread* listener_thread = new JavaThread(&attach_listener_thread_entry);
|
|
430 |
|
|
431 |
// Check that thread and osthread were created
|
|
432 |
if (listener_thread == NULL || listener_thread->osthread() == NULL) {
|
|
433 |
vm_exit_during_initialization("java.lang.OutOfMemoryError",
|
|
434 |
"unable to create new native thread");
|
|
435 |
}
|
|
436 |
|
|
437 |
java_lang_Thread::set_thread(thread_oop(), listener_thread);
|
|
438 |
java_lang_Thread::set_daemon(thread_oop());
|
|
439 |
|
|
440 |
listener_thread->set_threadObj(thread_oop());
|
|
441 |
Threads::add(listener_thread);
|
|
442 |
Thread::start(listener_thread);
|
|
443 |
}
|
|
444 |
}
|
|
445 |
|
|
446 |
// Performs clean-up tasks on platforms where we can detect that the last
|
|
447 |
// client has detached
|
|
448 |
void AttachListener::detachall() {
|
|
449 |
// call the platform dependent clean-up
|
|
450 |
pd_detachall();
|
|
451 |
}
|