jdk8-mips64-public/hotspot: src/share/vm/services/attachListener.cpp@eef07cd490d4 (annotated)

src/share/vm/services/attachListener.cpp@eef07cd490d4 (annotated)

src/share/vm/services/attachListener.cpp

Wed, 03 Jul 2019 20:42:37 +0800

author: aoqi
date: Wed, 03 Jul 2019 20:42:37 +0800
changeset 9637: eef07cd490d4
parent 9448: 73d689add964
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/javaClasses.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "gc_implementation/shared/vmGCOperations.hpp"
 #include "memory/resourceArea.hpp"
 #include "prims/jvmtiExport.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/globals.hpp"
 #include "runtime/java.hpp"
 #include "runtime/javaCalls.hpp"
 #include "runtime/os.hpp"
 #include "services/attachListener.hpp"
 #include "services/diagnosticCommand.hpp"
 #include "services/heapDumper.hpp"
 volatile bool AttachListener::_initialized;
 // Implementation of "properties" command.
 //
 // Invokes sun.misc.VMSupport.serializePropertiesToByteArray to serialize
 // the system properties into a byte array.
 static Klass* load_and_initialize_klass(Symbol* sh, TRAPS) {
   Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
   instanceKlassHandle ik (THREAD, k);
   if (ik->should_be_initialized()) {
     ik->initialize(CHECK_NULL);
   }
   return ik();
 }
 static jint get_properties(AttachOperation* op, outputStream* out, Symbol* serializePropertiesMethod) {
   Thread* THREAD = Thread::current();
   HandleMark hm;
   // load sun.misc.VMSupport
   Symbol* klass = vmSymbols::sun_misc_VMSupport();
   Klass* k = load_and_initialize_klass(klass, THREAD);
   if (HAS_PENDING_EXCEPTION) {
     java_lang_Throwable::print(PENDING_EXCEPTION, out);
     CLEAR_PENDING_EXCEPTION;
     return JNI_ERR;
   }
   instanceKlassHandle ik(THREAD, k);
   // invoke the serializePropertiesToByteArray method
   JavaValue result(T_OBJECT);
   JavaCallArguments args;
   Symbol* signature = vmSymbols::serializePropertiesToByteArray_signature();
   JavaCalls::call_static(&result,
                            ik,
                            serializePropertiesMethod,
                            signature,
                            &args,
                            THREAD);
   if (HAS_PENDING_EXCEPTION) {
     java_lang_Throwable::print(PENDING_EXCEPTION, out);
     CLEAR_PENDING_EXCEPTION;
     return JNI_ERR;
   }
   // The result should be a [B
   oop res = (oop)result.get_jobject();
   assert(res->is_typeArray(), "just checking");
   assert(TypeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "just checking");
   // copy the bytes to the output stream
   typeArrayOop ba = typeArrayOop(res);
   jbyte* addr = typeArrayOop(res)->byte_at_addr(0);
   out->print_raw((const char*)addr, ba->length());
   return JNI_OK;
 }
 // Implementation of "properties" command.
 // See also: PrintSystemPropertiesDCmd class
 static jint get_system_properties(AttachOperation* op, outputStream* out) {
   return get_properties(op, out, vmSymbols::serializePropertiesToByteArray_name());
 }
 // Implementation of "agent_properties" command.
 static jint get_agent_properties(AttachOperation* op, outputStream* out) {
   return get_properties(op, out, vmSymbols::serializeAgentPropertiesToByteArray_name());
 }
 // Implementation of "datadump" command.
 //
 // Raises a SIGBREAK signal so that VM dump threads, does deadlock detection,
 // etc. In theory this command should only post a DataDumpRequest to any
 // JVMTI environment that has enabled this event. However it's useful to
 // trigger the SIGBREAK handler.
 static jint data_dump(AttachOperation* op, outputStream* out) {
   if (!ReduceSignalUsage) {
     AttachListener::pd_data_dump();
   } else {
     if (JvmtiExport::should_post_data_dump()) {
       JvmtiExport::post_data_dump();
     }
   }
   return JNI_OK;
 }
 // Implementation of "threaddump" command - essentially a remote ctrl-break
 // See also: ThreadDumpDCmd class
 //
 static jint thread_dump(AttachOperation* op, outputStream* out) {
   bool print_concurrent_locks = false;
   if (op->arg(0) != NULL && strcmp(op->arg(0), "-l") == 0) {
     print_concurrent_locks = true;
   }
   // thread stacks
   VM_PrintThreads op1(out, print_concurrent_locks);
   VMThread::execute(&op1);
   // JNI global handles
   VM_PrintJNI op2(out);
   VMThread::execute(&op2);
   // Deadlock detection
   VM_FindDeadlocks op3(out);
   VMThread::execute(&op3);
   return JNI_OK;
 }
 // A jcmd attach operation request was received, which will now
 // dispatch to the diagnostic commands used for serviceability functions.
 static jint jcmd(AttachOperation* op, outputStream* out) {
   Thread* THREAD = Thread::current();
   // All the supplied jcmd arguments are stored as a single
   // string (op->arg(0)). This is parsed by the Dcmd framework.
   DCmd::parse_and_execute(DCmd_Source_AttachAPI, out, op->arg(0), ' ', THREAD);
   if (HAS_PENDING_EXCEPTION) {
     java_lang_Throwable::print(PENDING_EXCEPTION, out);
     out->cr();
     CLEAR_PENDING_EXCEPTION;
     return JNI_ERR;
   }
   return JNI_OK;
 }
 // Implementation of "dumpheap" command.
 // See also: HeapDumpDCmd class
 //
 // Input arguments :-
 //   arg0: Name of the dump file
 //   arg1: "-live" or "-all"
 jint dump_heap(AttachOperation* op, outputStream* out) {
   const char* path = op->arg(0);
   if (path == NULL || path[0] == '\0') {
     out->print_cr("No dump file specified");
   } else {
     bool live_objects_only = true;   // default is true to retain the behavior before this change is made
     const char* arg1 = op->arg(1);
     if (arg1 != NULL && (strlen(arg1) > 0)) {
       if (strcmp(arg1, "-all") != 0 && strcmp(arg1, "-live") != 0) {
         out->print_cr("Invalid argument to dumpheap operation: %s", arg1);
         return JNI_ERR;
       }
       live_objects_only = strcmp(arg1, "-live") == 0;
     }
     // Request a full GC before heap dump if live_objects_only = true
     // This helps reduces the amount of unreachable objects in the dump
     // and makes it easier to browse.
     HeapDumper dumper(live_objects_only /* request GC */);
     int res = dumper.dump(op->arg(0));
     if (res == 0) {
       out->print_cr("Heap dump file created");
     } else {
       // heap dump failed
       ResourceMark rm;
       char* error = dumper.error_as_C_string();
       if (error == NULL) {
         out->print_cr("Dump failed - reason unknown");
       } else {
         out->print_cr("%s", error);
       }
     }
   }
   return JNI_OK;
 }
 // Implementation of "inspectheap" command
 // See also: ClassHistogramDCmd class
 //
 // Input arguments :-
 //   arg0: "-live" or "-all"
 static jint heap_inspection(AttachOperation* op, outputStream* out) {
   bool live_objects_only = true;   // default is true to retain the behavior before this change is made
   const char* arg0 = op->arg(0);
   if (arg0 != NULL && (strlen(arg0) > 0)) {
     if (strcmp(arg0, "-all") != 0 && strcmp(arg0, "-live") != 0) {
       out->print_cr("Invalid argument to inspectheap operation: %s", arg0);
       return JNI_ERR;
     }
     live_objects_only = strcmp(arg0, "-live") == 0;
   }
   VM_GC_HeapInspection heapop(out, live_objects_only /* request full gc */);
   VMThread::execute(&heapop);
   return JNI_OK;
 }
 // set a boolean global flag using value from AttachOperation
 static jint set_bool_flag(const char* name, AttachOperation* op, outputStream* out) {
   bool value = true;
   const char* arg1;
   if ((arg1 = op->arg(1)) != NULL) {
     int tmp;
     int n = sscanf(arg1, "%d", &tmp);
     if (n != 1) {
       out->print_cr("flag value must be a boolean (1 or 0)");
       return JNI_ERR;
     }
     value = (tmp != 0);
   }
   bool res = CommandLineFlags::boolAtPut((char*)name, &value, Flag::ATTACH_ON_DEMAND);
   if (! res) {
     out->print_cr("setting flag %s failed", name);
   }
   return res? JNI_OK : JNI_ERR;
 }
 // set a intx global flag using value from AttachOperation
 static jint set_intx_flag(const char* name, AttachOperation* op, outputStream* out) {
   intx value;
   const char* arg1;
   if ((arg1 = op->arg(1)) != NULL) {
     int n = sscanf(arg1, INTX_FORMAT, &value);
     if (n != 1) {
       out->print_cr("flag value must be an integer");
       return JNI_ERR;
     }
   }
   bool res = CommandLineFlags::intxAtPut((char*)name, &value, Flag::ATTACH_ON_DEMAND);
   if (! res) {
     out->print_cr("setting flag %s failed", name);
   }
   return res? JNI_OK : JNI_ERR;
 }
 // set a uintx global flag using value from AttachOperation
 static jint set_uintx_flag(const char* name, AttachOperation* op, outputStream* out) {
   uintx value;
   const char* arg1 = op->arg(1);
   if (arg1 == NULL) {
     out->print_cr("flag value must be specified");
     return JNI_ERR;
   }
   int n = sscanf(arg1, UINTX_FORMAT, &value);
   if (n != 1) {
     out->print_cr("flag value must be an unsigned integer");
     return JNI_ERR;
   }
   if (strncmp(name, "MaxHeapFreeRatio", 17) == 0) {
     FormatBuffer<80> err_msg("%s", "");
     if (!Arguments::verify_MaxHeapFreeRatio(err_msg, value)) {
       out->print_cr("%s", err_msg.buffer());
       return JNI_ERR;
     }
   } else if (strncmp(name, "MinHeapFreeRatio", 17) == 0) {
     FormatBuffer<80> err_msg("%s", "");
     if (!Arguments::verify_MinHeapFreeRatio(err_msg, value)) {
       out->print_cr("%s", err_msg.buffer());
       return JNI_ERR;
     }
   }
   bool res = CommandLineFlags::uintxAtPut((char*)name, &value, Flag::ATTACH_ON_DEMAND);
   if (! res) {
     out->print_cr("setting flag %s failed", name);
   }
   return res? JNI_OK : JNI_ERR;
 }
 // set a uint64_t global flag using value from AttachOperation
 static jint set_uint64_t_flag(const char* name, AttachOperation* op, outputStream* out) {
   uint64_t value;
   const char* arg1;
   if ((arg1 = op->arg(1)) != NULL) {
     int n = sscanf(arg1, UINT64_FORMAT, &value);
     if (n != 1) {
       out->print_cr("flag value must be an unsigned 64-bit integer");
       return JNI_ERR;
     }
   }
   bool res = CommandLineFlags::uint64_tAtPut((char*)name, &value, Flag::ATTACH_ON_DEMAND);
   if (! res) {
     out->print_cr("setting flag %s failed", name);
   }
   return res? JNI_OK : JNI_ERR;
 }
 // set a string global flag using value from AttachOperation
 static jint set_ccstr_flag(const char* name, AttachOperation* op, outputStream* out) {
   const char* value;
   if ((value = op->arg(1)) == NULL) {
     out->print_cr("flag value must be a string");
     return JNI_ERR;
   }
   bool res = CommandLineFlags::ccstrAtPut((char*)name, &value, Flag::ATTACH_ON_DEMAND);
   if (res) {
     FREE_C_HEAP_ARRAY(char, value, mtInternal);
   } else {
     out->print_cr("setting flag %s failed", name);
   }
   return res? JNI_OK : JNI_ERR;
 }
 // Implementation of "setflag" command
 static jint set_flag(AttachOperation* op, outputStream* out) {
   const char* name = NULL;
   if ((name = op->arg(0)) == NULL) {
     out->print_cr("flag name is missing");
     return JNI_ERR;
   }
   Flag* f = Flag::find_flag((char*)name, strlen(name));
   if (f && f->is_external() && f->is_writeable()) {
     if (f->is_bool()) {
       return set_bool_flag(name, op, out);
     } else if (f->is_intx()) {
       return set_intx_flag(name, op, out);
     } else if (f->is_uintx()) {
       return set_uintx_flag(name, op, out);
     } else if (f->is_uint64_t()) {
       return set_uint64_t_flag(name, op, out);
     } else if (f->is_ccstr()) {
       return set_ccstr_flag(name, op, out);
     } else {
       ShouldNotReachHere();
       return JNI_ERR;
     }
   } else {
     return AttachListener::pd_set_flag(op, out);
   }
 }
 // Implementation of "printflag" command
 // See also: PrintVMFlagsDCmd class
 static jint print_flag(AttachOperation* op, outputStream* out) {
   const char* name = NULL;
   if ((name = op->arg(0)) == NULL) {
     out->print_cr("flag name is missing");
     return JNI_ERR;
   }
   Flag* f = Flag::find_flag((char*)name, strlen(name));
   if (f) {
     f->print_as_flag(out);
     out->cr();
   } else {
     out->print_cr("no such flag '%s'", name);
   }
   return JNI_OK;
 }
 // Table to map operation names to functions.
 // names must be of length <= AttachOperation::name_length_max
 static AttachOperationFunctionInfo funcs[] = {
   { "agentProperties",  get_agent_properties },
   { "datadump",         data_dump },
   { "dumpheap",         dump_heap },
   { "load",             JvmtiExport::load_agent_library },
   { "properties",       get_system_properties },
   { "threaddump",       thread_dump },
   { "inspectheap",      heap_inspection },
   { "setflag",          set_flag },
   { "printflag",        print_flag },
   { "jcmd",             jcmd },
   { NULL,               NULL }
 };
 // The Attach Listener threads services a queue. It dequeues an operation
 // from the queue, examines the operation name (command), and dispatches
 // to the corresponding function to perform the operation.
 static void attach_listener_thread_entry(JavaThread* thread, TRAPS) {
   os::set_priority(thread, NearMaxPriority);
   thread->record_stack_base_and_size();
   if (AttachListener::pd_init() != 0) {
     return;
   }
   AttachListener::set_initialized();
   for (;;) {
     AttachOperation* op = AttachListener::dequeue();
     if (op == NULL) {
       return;   // dequeue failed or shutdown
     }
     ResourceMark rm;
     bufferedStream st;
     jint res = JNI_OK;
     // handle special detachall operation
     if (strcmp(op->name(), AttachOperation::detachall_operation_name()) == 0) {
       AttachListener::detachall();
     } else {
       // find the function to dispatch too
       AttachOperationFunctionInfo* info = NULL;
       for (int i=0; funcs[i].name != NULL; i++) {
         const char* name = funcs[i].name;
         assert(strlen(name) <= AttachOperation::name_length_max, "operation <= name_length_max");
         if (strcmp(op->name(), name) == 0) {
           info = &(funcs[i]);
           break;
         }
       }
       // check for platform dependent attach operation
       if (info == NULL) {
         info = AttachListener::pd_find_operation(op->name());
       }
       if (info != NULL) {
         // dispatch to the function that implements this operation
         res = (info->func)(op, &st);
       } else {
         st.print("Operation %s not recognized!", op->name());
         res = JNI_ERR;
       }
     }
     // operation complete - send result and output to client
     op->complete(res, &st);
   }
 }
 bool AttachListener::has_init_error(TRAPS) {
   if (HAS_PENDING_EXCEPTION) {
     tty->print_cr("Exception in VM (AttachListener::init) : ");
     java_lang_Throwable::print(PENDING_EXCEPTION, tty);
     tty->cr();
     CLEAR_PENDING_EXCEPTION;
     return true;
   } else {
     return false;
   }
 }
 // Starts the Attach Listener thread
 void AttachListener::init() {
   EXCEPTION_MARK;
   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, THREAD);
   if (has_init_error(THREAD)) {
     return;
   }
   instanceKlassHandle klass (THREAD, k);
   instanceHandle thread_oop = klass->allocate_instance_handle(THREAD);
   if (has_init_error(THREAD)) {
     return;
   }
   const char thread_name[] = "Attach Listener";
   Handle string = java_lang_String::create_from_str(thread_name, THREAD);
   if (has_init_error(THREAD)) {
     return;
   }
   // Initialize thread_oop to put it into the system threadGroup
   Handle thread_group (THREAD, Universe::system_thread_group());
   JavaValue result(T_VOID);
   JavaCalls::call_special(&result, thread_oop,
                        klass,
                        vmSymbols::object_initializer_name(),
                        vmSymbols::threadgroup_string_void_signature(),
                        thread_group,
                        string,
                        THREAD);
   if (has_init_error(THREAD)) {
     return;
   }
   KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass());
   JavaCalls::call_special(&result,
                         thread_group,
                         group,
                         vmSymbols::add_method_name(),
                         vmSymbols::thread_void_signature(),
                         thread_oop,             // ARG 1
                         THREAD);
   if (has_init_error(THREAD)) {
     return;
   }
   { MutexLocker mu(Threads_lock);
     JavaThread* listener_thread = new JavaThread(&attach_listener_thread_entry);
     // Check that thread and osthread were created
     if (listener_thread == NULL || listener_thread->osthread() == NULL) {
       vm_exit_during_initialization("java.lang.OutOfMemoryError",
                                     "unable to create new native thread");
     }
     java_lang_Thread::set_thread(thread_oop(), listener_thread);
     java_lang_Thread::set_daemon(thread_oop());
     listener_thread->set_threadObj(thread_oop());
     Threads::add(listener_thread);
     Thread::start(listener_thread);
   }
 }
 // Performs clean-up tasks on platforms where we can detect that the last
 // client has detached
 void AttachListener::detachall() {
   // call the platform dependent clean-up
   pd_detachall();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/services/attachListener.cpp@eef07cd490d4 (annotated)

src/share/vm/services/attachListener.cpp