Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 2003-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 # include "incls/_precompiled.incl"

 # include "incls/_vmError.cpp.incl"

 // List of environment variables that should be reported in error log file.

 const char *env_list[] = {

   // All platforms

   "JAVA_HOME", "JRE_HOME", "JAVA_TOOL_OPTIONS", "_JAVA_OPTIONS", "CLASSPATH",

   "JAVA_COMPILER", "PATH", "USERNAME",

   // Env variables that are defined on Solaris/Linux

   "LD_LIBRARY_PATH", "LD_PRELOAD", "SHELL", "DISPLAY",

   "HOSTTYPE", "OSTYPE", "ARCH", "MACHTYPE",

   // defined on Linux

   "LD_ASSUME_KERNEL", "_JAVA_SR_SIGNUM",

   // defined on Windows

   "OS", "PROCESSOR_IDENTIFIER", "_ALT_JAVA_HOME_DIR",

   (const char *)0

 };

 // Fatal error handler for internal errors and crashes.

 //

 // The default behavior of fatal error handler is to print a brief message

 // to standard out (defaultStream::output_fd()), then save detailed information

 // into an error report file (hs_err_pid<pid>.log) and abort VM. If multiple

 // threads are having troubles at the same time, only one error is reported.

 // The thread that is reporting error will abort VM when it is done, all other

 // threads are blocked forever inside report_and_die().

 // Constructor for crashes

 VMError::VMError(Thread* thread, int sig, address pc, void* siginfo, void* context) {

     _thread = thread;

     _id = sig;

     _pc   = pc;

     _siginfo = siginfo;

     _context = context;

     _verbose = false;

     _current_step = 0;

     _current_step_info = NULL;

     _message = "";

     _filename = NULL;

     _lineno = 0;

     _size = 0;

 }

 // Constructor for internal errors

 VMError::VMError(Thread* thread, const char* message, const char* filename, int lineno) {

     _thread = thread;

     _id = internal_error;     // set it to a value that's not an OS exception/signal

     _filename = filename;

     _lineno = lineno;

     _message = message;

     _verbose = false;

     _current_step = 0;

     _current_step_info = NULL;

     _pc = NULL;

     _siginfo = NULL;

     _context = NULL;

     _size = 0;

 }

 // Constructor for OOM errors

 VMError::VMError(Thread* thread, size_t size, const char* message, const char* filename, int lineno) {

     _thread = thread;

     _id = oom_error;     // set it to a value that's not an OS exception/signal

     _filename = filename;

     _lineno = lineno;

     _message = message;

     _verbose = false;

     _current_step = 0;

     _current_step_info = NULL;

     _pc = NULL;

     _siginfo = NULL;

     _context = NULL;

     _size = size;

 }

 // Constructor for non-fatal errors

 VMError::VMError(const char* message) {

     _thread = NULL;

     _id = internal_error;     // set it to a value that's not an OS exception/signal

     _filename = NULL;

     _lineno = 0;

     _message = message;

     _verbose = false;

     _current_step = 0;

     _current_step_info = NULL;

     _pc = NULL;

     _siginfo = NULL;

     _context = NULL;

     _size = 0;

 }

 // -XX:OnError=<string>, where <string> can be a list of commands, separated

 // by ';'. "%p" is replaced by current process id (pid); "%%" is replaced by

 // a single "%". Some examples:

 //

 // -XX:OnError="pmap %p"                // show memory map

 // -XX:OnError="gcore %p; dbx - %p"     // dump core and launch debugger

 // -XX:OnError="cat hs_err_pid%p.log | mail my_email@sun.com"

 // -XX:OnError="kill -9 %p"             // ?#!@#

 // A simple parser for -XX:OnError, usage:

 //  ptr = OnError;

 //  while ((cmd = next_OnError_command(buffer, sizeof(buffer), &ptr) != NULL)

 //     ... ...

 static char* next_OnError_command(char* buf, int buflen, const char** ptr) {

   if (ptr == NULL || *ptr == NULL) return NULL;

   const char* cmd = *ptr;

   // skip leading blanks or ';'

   while (*cmd == ' ' || *cmd == ';') cmd++;

   if (*cmd == '\0') return NULL;

   const char * cmdend = cmd;

   while (*cmdend != '\0' && *cmdend != ';') cmdend++;

   Arguments::copy_expand_pid(cmd, cmdend - cmd, buf, buflen);

   *ptr = (*cmdend == '\0' ? cmdend : cmdend + 1);

   return buf;

 }

 static void print_bug_submit_message(outputStream *out, Thread *thread) {

   if (out == NULL) return;

   out->print_raw_cr("# If you would like to submit a bug report, please visit:");

   out->print_raw   ("#   ");

   out->print_raw_cr(Arguments::java_vendor_url_bug());

   // If the crash is in native code, encourage user to submit a bug to the

   // provider of that code.

   if (thread && thread->is_Java_thread() &&

       !thread->is_hidden_from_external_view()) {

     JavaThread* jt = (JavaThread*)thread;

     if (jt->thread_state() == _thread_in_native) {

       out->print_cr("# The crash happened outside the Java Virtual Machine in native code.\n# See problematic frame for where to report the bug.");

     }

   }

   out->print_raw_cr("#");

 }

 // Return a string to describe the error

 char* VMError::error_string(char* buf, int buflen) {

   char signame_buf[64];

   const char *signame = os::exception_name(_id, signame_buf, sizeof(signame_buf));

   if (signame) {

     jio_snprintf(buf, buflen,

                  "%s (0x%x) at pc=" PTR_FORMAT ", pid=%d, tid=" UINTX_FORMAT,

                  signame, _id, _pc,

                  os::current_process_id(), os::current_thread_id());

   } else {

     if (_filename != NULL && _lineno > 0) {

       // skip directory names

       char separator = os::file_separator()[0];

       const char *p = strrchr(_filename, separator);

       jio_snprintf(buf, buflen,

         "Internal Error at %s:%d, pid=%d, tid=" UINTX_FORMAT " \nError: %s",

         p ? p + 1 : _filename, _lineno,

         os::current_process_id(), os::current_thread_id(),

         _message ? _message : "");

     } else {

       jio_snprintf(buf, buflen,

         "Internal Error (0x%x), pid=%d, tid=" UINTX_FORMAT,

         _id, os::current_process_id(), os::current_thread_id());

     }

   }

   return buf;

 }

 // This is the main function to report a fatal error. Only one thread can

 // call this function, so we don't need to worry about MT-safety. But it's

 // possible that the error handler itself may crash or die on an internal

 // error, for example, when the stack/heap is badly damaged. We must be

 // able to handle recursive errors that happen inside error handler.

 //

 // Error reporting is done in several steps. If a crash or internal error

 // occurred when reporting an error, the nested signal/exception handler

 // can skip steps that are already (or partially) done. Error reporting will

 // continue from the next step. This allows us to retrieve and print

 // information that may be unsafe to get after a fatal error. If it happens,

 // you may find nested report_and_die() frames when you look at the stack

 // in a debugger.

 //

 // In general, a hang in error handler is much worse than a crash or internal

 // error, as it's harder to recover from a hang. Deadlock can happen if we

 // try to grab a lock that is already owned by current thread, or if the

 // owner is blocked forever (e.g. in os::infinite_sleep()). If possible, the

 // error handler and all the functions it called should avoid grabbing any

 // lock. An important thing to notice is that memory allocation needs a lock.

 //

 // We should avoid using large stack allocated buffers. Many errors happen

 // when stack space is already low. Making things even worse is that there

 // could be nested report_and_die() calls on stack (see above). Only one

 // thread can report error, so large buffers are statically allocated in data

 // segment.

 void VMError::report(outputStream* st) {

 # define BEGIN if (_current_step == 0) { _current_step = 1;

 # define STEP(n, s) } if (_current_step < n) { _current_step = n; _current_step_info = s;

 # define END }

   // don't allocate large buffer on stack

   static char buf[O_BUFLEN];

   BEGIN

   STEP(10, "(printing fatal error message)")

      st->print_cr("#");

      st->print_cr("# A fatal error has been detected by the Java Runtime Environment:");

   STEP(15, "(printing type of error)")

      switch(_id) {

        case oom_error:

          st->print_cr("#");

          st->print("# java.lang.OutOfMemoryError: ");

          if (_size) {

            st->print("requested ");

            sprintf(buf,SIZE_FORMAT,_size);

            st->print(buf);

            st->print(" bytes");

            if (_message != NULL) {

              st->print(" for ");

              st->print(_message);

            }

            st->print_cr(". Out of swap space?");

          } else {

            if (_message != NULL)

              st->print_cr(_message);

          }

          break;

        case internal_error:

        default:

          break;

      }

   STEP(20, "(printing exception/signal name)")

      st->print_cr("#");

      st->print("#  ");

      // Is it an OS exception/signal?

      if (os::exception_name(_id, buf, sizeof(buf))) {

        st->print("%s", buf);

        st->print(" (0x%x)", _id);                // signal number

        st->print(" at pc=" PTR_FORMAT, _pc);

      } else {

        st->print("Internal Error");

        if (_filename != NULL && _lineno > 0) {

 #ifdef PRODUCT

          // In product mode chop off pathname?

          char separator = os::file_separator()[0];

          const char *p = strrchr(_filename, separator);

          const char *file = p ? p+1 : _filename;

 #else

          const char *file = _filename;

 #endif

          size_t len = strlen(file);

          size_t buflen = sizeof(buf);

          strncpy(buf, file, buflen);

          if (len + 10 < buflen) {

            sprintf(buf + len, ":" SIZE_FORMAT, _lineno);

          }

          st->print(" (%s)", buf);

        } else {

          st->print(" (0x%x)", _id);

        }

      }

   STEP(30, "(printing current thread and pid)")

      // process id, thread id

      st->print(", pid=%d", os::current_process_id());

      st->print(", tid=" UINTX_FORMAT, os::current_thread_id());

      st->cr();

   STEP(40, "(printing error message)")

      // error message

      if (_message && _message[0] != '\0') {

        st->print_cr("#  Error: %s", _message);

      }

   STEP(50, "(printing Java version string)")

      // VM version

      st->print_cr("#");

      st->print_cr("# Java VM: %s (%s %s %s %s)",

                    Abstract_VM_Version::vm_name(),

                    Abstract_VM_Version::vm_release(),

                    Abstract_VM_Version::vm_info_string(),

                    Abstract_VM_Version::vm_platform_string(),

                    UseCompressedOops ? "compressed oops" : ""

                  );

   STEP(60, "(printing problematic frame)")

      // Print current frame if we have a context (i.e. it's a crash)

      if (_context) {

        st->print_cr("# Problematic frame:");

        st->print("# ");

        frame fr = os::fetch_frame_from_context(_context);

        fr.print_on_error(st, buf, sizeof(buf));

        st->cr();

        st->print_cr("#");

      }

   STEP(65, "(printing bug submit message)")

      if (_verbose) print_bug_submit_message(st, _thread);

   STEP(70, "(printing thread)" )

      if (_verbose) {

        st->cr();

        st->print_cr("---------------  T H R E A D  ---------------");

        st->cr();

      }

   STEP(80, "(printing current thread)" )

      // current thread

      if (_verbose) {

        if (_thread) {

          st->print("Current thread (" PTR_FORMAT "):  ", _thread);

          _thread->print_on_error(st, buf, sizeof(buf));

          st->cr();

        } else {

          st->print_cr("Current thread is native thread");

        }

        st->cr();

      }

   STEP(90, "(printing siginfo)" )

      // signal no, signal code, address that caused the fault

      if (_verbose && _siginfo) {

        os::print_siginfo(st, _siginfo);

        st->cr();

      }

   STEP(100, "(printing registers, top of stack, instructions near pc)")

      // registers, top of stack, instructions near pc

      if (_verbose && _context) {

        os::print_context(st, _context);

        st->cr();

      }

   STEP(110, "(printing stack bounds)" )

      if (_verbose) {

        st->print("Stack: ");

        address stack_top;

        size_t stack_size;

        if (_thread) {

           stack_top = _thread->stack_base();

           stack_size = _thread->stack_size();

        } else {

           stack_top = os::current_stack_base();

           stack_size = os::current_stack_size();

        }

        address stack_bottom = stack_top - stack_size;

        st->print("[" PTR_FORMAT "," PTR_FORMAT "]", stack_bottom, stack_top);

        frame fr = _context ? os::fetch_frame_from_context(_context)

                            : os::current_frame();

        if (fr.sp()) {

          st->print(",  sp=" PTR_FORMAT, fr.sp());

          st->print(",  free space=%dk",

                      ((intptr_t)fr.sp() - (intptr_t)stack_bottom) >> 10);

        }

        st->cr();

      }

   STEP(120, "(printing native stack)" )

      if (_verbose) {

        frame fr = _context ? os::fetch_frame_from_context(_context)

                            : os::current_frame();

        // see if it's a valid frame

        if (fr.pc()) {

           st->print_cr("Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)");

           int count = 0;

           while (count++ < StackPrintLimit) {

              fr.print_on_error(st, buf, sizeof(buf));

              st->cr();

              if (os::is_first_C_frame(&fr)) break;

              fr = os::get_sender_for_C_frame(&fr);

           }

           if (count > StackPrintLimit) {

              st->print_cr("...<more frames>...");

           }

           st->cr();

        }

      }

   STEP(130, "(printing Java stack)" )

      if (_verbose && _thread && _thread->is_Java_thread()) {

        JavaThread* jt = (JavaThread*)_thread;

        if (jt->has_last_Java_frame()) {

          st->print_cr("Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)");

          for(StackFrameStream sfs(jt); !sfs.is_done(); sfs.next()) {

            sfs.current()->print_on_error(st, buf, sizeof(buf));

            st->cr();

          }

        }

      }

   STEP(140, "(printing VM operation)" )

      if (_verbose && _thread && _thread->is_VM_thread()) {

         VMThread* t = (VMThread*)_thread;

         VM_Operation* op = t->vm_operation();

         if (op) {

           op->print_on_error(st);

           st->cr();

           st->cr();

         }

      }

   STEP(150, "(printing current compile task)" )

      if (_verbose && _thread && _thread->is_Compiler_thread()) {

         CompilerThread* t = (CompilerThread*)_thread;

         if (t->task()) {

            st->cr();

            st->print_cr("Current CompileTask:");

            t->task()->print_line_on_error(st, buf, sizeof(buf));

            st->cr();

         }

      }

   STEP(160, "(printing process)" )

      if (_verbose) {

        st->cr();

        st->print_cr("---------------  P R O C E S S  ---------------");

        st->cr();

      }

   STEP(170, "(printing all threads)" )

      // all threads

      if (_verbose && _thread) {

        Threads::print_on_error(st, _thread, buf, sizeof(buf));

        st->cr();

      }

   STEP(175, "(printing VM state)" )

      if (_verbose) {

        // Safepoint state

        st->print("VM state:");

        if (SafepointSynchronize::is_synchronizing()) st->print("synchronizing");

        else if (SafepointSynchronize::is_at_safepoint()) st->print("at safepoint");

        else st->print("not at safepoint");

        // Also see if error occurred during initialization or shutdown

        if (!Universe::is_fully_initialized()) {

          st->print(" (not fully initialized)");

        } else if (VM_Exit::vm_exited()) {

          st->print(" (shutting down)");

        } else {

          st->print(" (normal execution)");

        }

        st->cr();

        st->cr();

      }

   STEP(180, "(printing owned locks on error)" )

      // mutexes/monitors that currently have an owner

      if (_verbose) {

        print_owned_locks_on_error(st);

        st->cr();

      }

   STEP(190, "(printing heap information)" )

      if (_verbose && Universe::is_fully_initialized()) {

        // print heap information before vm abort

        Universe::print_on(st);

        st->cr();

      }

   STEP(200, "(printing dynamic libraries)" )

      if (_verbose) {

        // dynamic libraries, or memory map

        os::print_dll_info(st);

        st->cr();

      }

   STEP(210, "(printing VM options)" )

      if (_verbose) {

        // VM options

        Arguments::print_on(st);

        st->cr();

      }

   STEP(220, "(printing environment variables)" )

      if (_verbose) {

        os::print_environment_variables(st, env_list, buf, sizeof(buf));

        st->cr();

      }

   STEP(225, "(printing signal handlers)" )

      if (_verbose) {

        os::print_signal_handlers(st, buf, sizeof(buf));

        st->cr();

      }

   STEP(230, "" )

      if (_verbose) {

        st->cr();

        st->print_cr("---------------  S Y S T E M  ---------------");

        st->cr();

      }

   STEP(240, "(printing OS information)" )

      if (_verbose) {

        os::print_os_info(st);

        st->cr();

      }

   STEP(250, "(printing CPU info)" )

      if (_verbose) {

        os::print_cpu_info(st);

        st->cr();

      }

   STEP(260, "(printing memory info)" )

      if (_verbose) {

        os::print_memory_info(st);

        st->cr();

      }

   STEP(270, "(printing internal vm info)" )

      if (_verbose) {

        st->print_cr("vm_info: %s", Abstract_VM_Version::internal_vm_info_string());

        st->cr();

      }

   STEP(280, "(printing date and time)" )

      if (_verbose) {

        os::print_date_and_time(st);

        st->cr();

      }

   END

 # undef BEGIN

 # undef STEP

 # undef END

 }

 void VMError::report_and_die() {

   // Don't allocate large buffer on stack

   static char buffer[O_BUFLEN];

   // First error, and its thread id. We must be able to handle native thread,

   // so use thread id instead of Thread* to identify thread.

   static VMError* first_error;

   static jlong    first_error_tid;

   // An error could happen before tty is initialized or after it has been

   // destroyed. Here we use a very simple unbuffered fdStream for printing.

   // Only out.print_raw() and out.print_raw_cr() should be used, as other

   // printing methods need to allocate large buffer on stack. To format a

   // string, use jio_snprintf() with a static buffer or use staticBufferStream.

   static fdStream out(defaultStream::output_fd());

   // How many errors occurred in error handler when reporting first_error.

   static int recursive_error_count;

   // We will first print a brief message to standard out (verbose = false),

   // then save detailed information in log file (verbose = true).

   static bool out_done = false;         // done printing to standard out

   static bool log_done = false;         // done saving error log

   static fdStream log;                  // error log

   if (SuppressFatalErrorMessage) {

       os::abort();

   }

   jlong mytid = os::current_thread_id();

   if (first_error == NULL &&

       Atomic::cmpxchg_ptr(this, &first_error, NULL) == NULL) {

     // first time

     first_error_tid = mytid;

     set_error_reported();

     if (ShowMessageBoxOnError) {

       show_message_box(buffer, sizeof(buffer));

       // User has asked JVM to abort. Reset ShowMessageBoxOnError so the

       // WatcherThread can kill JVM if the error handler hangs.

       ShowMessageBoxOnError = false;

     }

     // reset signal handlers or exception filter; make sure recursive crashes

     // are handled properly.

     reset_signal_handlers();

   } else {

     // This is not the first error, see if it happened in a different thread

     // or in the same thread during error reporting.

     if (first_error_tid != mytid) {

       jio_snprintf(buffer, sizeof(buffer),

                    "[thread " INT64_FORMAT " also had an error]",

                    mytid);

       out.print_raw_cr(buffer);

       // error reporting is not MT-safe, block current thread

       os::infinite_sleep();

     } else {

       if (recursive_error_count++ > 30) {

         out.print_raw_cr("[Too many errors, abort]");

         os::die();

       }

       jio_snprintf(buffer, sizeof(buffer),

                    "[error occurred during error reporting %s, id 0x%x]",

                    first_error ? first_error->_current_step_info : "",

                    _id);

       if (log.is_open()) {

         log.cr();

         log.print_raw_cr(buffer);

         log.cr();

       } else {

         out.cr();

         out.print_raw_cr(buffer);

         out.cr();

       }

     }

   }

   // print to screen

   if (!out_done) {

     first_error->_verbose = false;

     staticBufferStream sbs(buffer, sizeof(buffer), &out);

     first_error->report(&sbs);

     out_done = true;

     first_error->_current_step = 0;         // reset current_step

     first_error->_current_step_info = "";   // reset current_step string

   }

   // print to error log file

   if (!log_done) {

     first_error->_verbose = true;

     // see if log file is already open

     if (!log.is_open()) {

       // open log file

       int fd = -1;

       if (ErrorFile != NULL) {

         bool copy_ok =

           Arguments::copy_expand_pid(ErrorFile, strlen(ErrorFile), buffer, sizeof(buffer));

         if (copy_ok) {

           fd = open(buffer, O_WRONLY | O_CREAT | O_TRUNC, 0666);

         }

       }

       if (fd == -1) {

         const char *cwd = os::get_current_directory(buffer, sizeof(buffer));

         size_t len = strlen(cwd);

         // either user didn't specify, or the user's location failed,

         // so use the default name in the current directory

         jio_snprintf(&buffer[len], sizeof(buffer)-len, "%shs_err_pid%u.log",

                      os::file_separator(), os::current_process_id());

         fd = open(buffer, O_WRONLY | O_CREAT | O_TRUNC, 0666);

       }

       if (fd == -1) {

         // try temp directory

         const char * tmpdir = os::get_temp_directory();

         jio_snprintf(buffer, sizeof(buffer), "%shs_err_pid%u.log",

                      (tmpdir ? tmpdir : ""), os::current_process_id());

         fd = open(buffer, O_WRONLY | O_CREAT | O_TRUNC, 0666);

       }

       if (fd != -1) {

         out.print_raw("# An error report file with more information is saved as:\n# ");

         out.print_raw_cr(buffer);

         os::set_error_file(buffer);

         log.set_fd(fd);

       } else {

         out.print_raw_cr("# Can not save log file, dump to screen..");

         log.set_fd(defaultStream::output_fd());

       }

     }

     staticBufferStream sbs(buffer, O_BUFLEN, &log);

     first_error->report(&sbs);

     first_error->_current_step = 0;         // reset current_step

     first_error->_current_step_info = "";   // reset current_step string

     if (log.fd() != defaultStream::output_fd()) {

       close(log.fd());

     }

     log.set_fd(-1);

     log_done = true;

   }

   static bool skip_OnError = false;

   if (!skip_OnError && OnError && OnError[0]) {

     skip_OnError = true;

     out.print_raw_cr("#");

     out.print_raw   ("# -XX:OnError=\"");

     out.print_raw   (OnError);

     out.print_raw_cr("\"");

     char* cmd;

     const char* ptr = OnError;

     while ((cmd = next_OnError_command(buffer, sizeof(buffer), &ptr)) != NULL){

       out.print_raw   ("#   Executing ");

 #if defined(LINUX)

       out.print_raw   ("/bin/sh -c ");

 #elif defined(SOLARIS)

       out.print_raw   ("/usr/bin/sh -c ");

 #endif

       out.print_raw   ("\"");

       out.print_raw   (cmd);

       out.print_raw_cr("\" ...");

       os::fork_and_exec(cmd);

     }

     // done with OnError

     OnError = NULL;

   }

   static bool skip_bug_url = false;

   if (!skip_bug_url) {

     skip_bug_url = true;

     out.print_raw_cr("#");

     print_bug_submit_message(&out, _thread);

   }

   if (!UseOSErrorReporting) {

     // os::abort() will call abort hooks, try it first.

     static bool skip_os_abort = false;

     if (!skip_os_abort) {

       skip_os_abort = true;

       os::abort();

     }

     // if os::abort() doesn't abort, try os::die();

     os::die();

   }

 }

 /*

  * OnOutOfMemoryError scripts/commands executed while VM is a safepoint - this

  * ensures utilities such as jmap can observe the process is a consistent state.

  */

 class VM_ReportJavaOutOfMemory : public VM_Operation {

  private:

   VMError *_err;

  public:

   VM_ReportJavaOutOfMemory(VMError *err) { _err = err; }

   VMOp_Type type() const                 { return VMOp_ReportJavaOutOfMemory; }

   void doit();

 };

 void VM_ReportJavaOutOfMemory::doit() {

   // Don't allocate large buffer on stack

   static char buffer[O_BUFLEN];

   tty->print_cr("#");

   tty->print_cr("# java.lang.OutOfMemoryError: %s", _err->message());

   tty->print_cr("# -XX:OnOutOfMemoryError=\"%s\"", OnOutOfMemoryError);

   // make heap parsability

   Universe::heap()->ensure_parsability(false);  // no need to retire TLABs

   char* cmd;

   const char* ptr = OnOutOfMemoryError;

   while ((cmd = next_OnError_command(buffer, sizeof(buffer), &ptr)) != NULL){

     tty->print("#   Executing ");

 #if defined(LINUX)

     tty->print  ("/bin/sh -c ");

 #elif defined(SOLARIS)

     tty->print  ("/usr/bin/sh -c ");

 #endif

     tty->print_cr("\"%s\"...", cmd);

     os::fork_and_exec(cmd);

   }

 }

 void VMError::report_java_out_of_memory() {

   if (OnOutOfMemoryError && OnOutOfMemoryError[0]) {

     MutexLocker ml(Heap_lock);

     VM_ReportJavaOutOfMemory op(this);

     VMThread::execute(&op);

   }

 }