jdk8-mips64-public/hotspot: src/os/posix/vm/os_posix.cpp@833b0f92429a (annotated)

src/os/posix/vm/os_posix.cpp@833b0f92429a (annotated)

src/os/posix/vm/os_posix.cpp

Wed, 27 Aug 2014 08:19:12 -0400

author: zgu
date: Wed, 27 Aug 2014 08:19:12 -0400
changeset 7074: 833b0f92429a
parent 6680: 78bbf4d43a14
child 7535: 7ae4e26cb1e0
child 8423: 2988e5adeb8c
permissions: -rw-r--r--

8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill

 /*
 * Copyright (c) 1999, 2014, 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 "utilities/globalDefinitions.hpp"
 #include "prims/jvm.h"
 #include "runtime/frame.inline.hpp"
 #include "runtime/os.hpp"
 #include "utilities/vmError.hpp"
 #include <signal.h>
 #include <unistd.h>
 #include <sys/resource.h>
 #include <sys/utsname.h>
 #include <pthread.h>
 #include <signal.h>
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 // Todo: provide a os::get_max_process_id() or similar. Number of processes
 // may have been configured, can be read more accurately from proc fs etc.
 #ifndef MAX_PID
 #define MAX_PID INT_MAX
 #endif
 #define IS_VALID_PID(p) (p > 0 && p < MAX_PID)
 // Check core dump limit and report possible place where core can be found
 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
   int n;
   struct rlimit rlim;
   bool success;
   n = get_core_path(buffer, bufferSize);
   if (getrlimit(RLIMIT_CORE, &rlim) != 0) {
     jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id());
     success = true;
   } else {
     switch(rlim.rlim_cur) {
       case RLIM_INFINITY:
         jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id());
         success = true;
         break;
       case 0:
         jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again");
         success = false;
         break;
       default:
         jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (max size %lu kB). To ensure a full core dump, try \"ulimit -c unlimited\" before starting Java again", current_process_id(), (unsigned long)(rlim.rlim_cur >> 10));
         success = true;
         break;
     }
   }
   VMError::report_coredump_status(buffer, success);
 }
 int os::get_native_stack(address* stack, int frames, int toSkip) {
 #ifdef _NMT_NOINLINE_
   toSkip++;
 #endif
   int frame_idx = 0;
   int num_of_frames;  // number of frames captured
   frame fr = os::current_frame();
   while (fr.pc() && frame_idx < frames) {
     if (toSkip > 0) {
       toSkip --;
     } else {
       stack[frame_idx ++] = fr.pc();
     }
     if (fr.fp() == NULL || os::is_first_C_frame(&fr)
         ||fr.sender_pc() == NULL || fr.cb() != NULL) break;
     if (fr.sender_pc() && !os::is_first_C_frame(&fr)) {
       fr = os::get_sender_for_C_frame(&fr);
     } else {
       break;
     }
   }
   num_of_frames = frame_idx;
   for (; frame_idx < frames; frame_idx ++) {
     stack[frame_idx] = NULL;
   }
   return num_of_frames;
 }
 bool os::unsetenv(const char* name) {
   assert(name != NULL, "Null pointer");
   return (::unsetenv(name) == 0);
 }
 int os::get_last_error() {
   return errno;
 }
 bool os::is_debugger_attached() {
   // not implemented
   return false;
 }
 void os::wait_for_keypress_at_exit(void) {
   // don't do anything on posix platforms
   return;
 }
 // Multiple threads can race in this code, and can remap over each other with MAP_FIXED,
 // so on posix, unmap the section at the start and at the end of the chunk that we mapped
 // rather than unmapping and remapping the whole chunk to get requested alignment.
 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
   assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
       "Alignment must be a multiple of allocation granularity (page size)");
   assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
   size_t extra_size = size + alignment;
   assert(extra_size >= size, "overflow, size is too large to allow alignment");
   char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
   if (extra_base == NULL) {
     return NULL;
   }
   // Do manual alignment
   char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
   // [  |                                       |  ]
   // ^ extra_base
   //    ^ extra_base + begin_offset == aligned_base
   //     extra_base + begin_offset + size       ^
   //                       extra_base + extra_size ^
   // |<>| == begin_offset
   //                              end_offset == |<>|
   size_t begin_offset = aligned_base - extra_base;
   size_t end_offset = (extra_base + extra_size) - (aligned_base + size);
   if (begin_offset > 0) {
       os::release_memory(extra_base, begin_offset);
   }
   if (end_offset > 0) {
       os::release_memory(extra_base + begin_offset + size, end_offset);
   }
   return aligned_base;
 }
 void os::Posix::print_load_average(outputStream* st) {
   st->print("load average:");
   double loadavg[3];
   os::loadavg(loadavg, 3);
   st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
   st->cr();
 }
 void os::Posix::print_rlimit_info(outputStream* st) {
   st->print("rlimit:");
   struct rlimit rlim;
   st->print(" STACK ");
   getrlimit(RLIMIT_STACK, &rlim);
   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
   else st->print("%uk", rlim.rlim_cur >> 10);
   st->print(", CORE ");
   getrlimit(RLIMIT_CORE, &rlim);
   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
   else st->print("%uk", rlim.rlim_cur >> 10);
   // Isn't there on solaris
 #if !defined(TARGET_OS_FAMILY_solaris) && !defined(TARGET_OS_FAMILY_aix)
   st->print(", NPROC ");
   getrlimit(RLIMIT_NPROC, &rlim);
   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
   else st->print("%d", rlim.rlim_cur);
 #endif
   st->print(", NOFILE ");
   getrlimit(RLIMIT_NOFILE, &rlim);
   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
   else st->print("%d", rlim.rlim_cur);
   st->print(", AS ");
   getrlimit(RLIMIT_AS, &rlim);
   if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
   else st->print("%uk", rlim.rlim_cur >> 10);
   st->cr();
 }
 void os::Posix::print_uname_info(outputStream* st) {
   // kernel
   st->print("uname:");
   struct utsname name;
   uname(&name);
   st->print("%s ", name.sysname);
   st->print("%s ", name.release);
   st->print("%s ", name.version);
   st->print("%s", name.machine);
   st->cr();
 }
 bool os::has_allocatable_memory_limit(julong* limit) {
   struct rlimit rlim;
   int getrlimit_res = getrlimit(RLIMIT_AS, &rlim);
   // if there was an error when calling getrlimit, assume that there is no limitation
   // on virtual memory.
   bool result;
   if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) {
     result = false;
   } else {
     *limit = (julong)rlim.rlim_cur;
     result = true;
   }
 #ifdef _LP64
   return result;
 #else
   // arbitrary virtual space limit for 32 bit Unices found by testing. If
   // getrlimit above returned a limit, bound it with this limit. Otherwise
   // directly use it.
   const julong max_virtual_limit = (julong)3800*M;
   if (result) {
     *limit = MIN2(*limit, max_virtual_limit);
   } else {
     *limit = max_virtual_limit;
   }
   // bound by actually allocatable memory. The algorithm uses two bounds, an
   // upper and a lower limit. The upper limit is the current highest amount of
   // memory that could not be allocated, the lower limit is the current highest
   // amount of memory that could be allocated.
   // The algorithm iteratively refines the result by halving the difference
   // between these limits, updating either the upper limit (if that value could
   // not be allocated) or the lower limit (if the that value could be allocated)
   // until the difference between these limits is "small".
   // the minimum amount of memory we care about allocating.
   const julong min_allocation_size = M;
   julong upper_limit = *limit;
   // first check a few trivial cases
   if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) {
     *limit = upper_limit;
   } else if (!is_allocatable(min_allocation_size)) {
     // we found that not even min_allocation_size is allocatable. Return it
     // anyway. There is no point to search for a better value any more.
     *limit = min_allocation_size;
   } else {
     // perform the binary search.
     julong lower_limit = min_allocation_size;
     while ((upper_limit - lower_limit) > min_allocation_size) {
       julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit;
       temp_limit = align_size_down_(temp_limit, min_allocation_size);
       if (is_allocatable(temp_limit)) {
         lower_limit = temp_limit;
       } else {
         upper_limit = temp_limit;
       }
     }
     *limit = lower_limit;
   }
   return true;
 #endif
 }
 const char* os::get_current_directory(char *buf, size_t buflen) {
   return getcwd(buf, buflen);
 }
 FILE* os::open(int fd, const char* mode) {
   return ::fdopen(fd, mode);
 }
 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
 // which is used to find statically linked in agents.
 // Parameters:
 //            sym_name: Symbol in library we are looking for
 //            lib_name: Name of library to look in, NULL for shared libs.
 //            is_absolute_path == true if lib_name is absolute path to agent
 //                                     such as "/a/b/libL.so"
 //            == false if only the base name of the library is passed in
 //               such as "L"
 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
                                     bool is_absolute_path) {
   char *agent_entry_name;
   size_t len;
   size_t name_len;
   size_t prefix_len = strlen(JNI_LIB_PREFIX);
   size_t suffix_len = strlen(JNI_LIB_SUFFIX);
   const char *start;
   if (lib_name != NULL) {
     len = name_len = strlen(lib_name);
     if (is_absolute_path) {
       // Need to strip path, prefix and suffix
       if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
         lib_name = ++start;
       }
       if (len <= (prefix_len + suffix_len)) {
         return NULL;
       }
       lib_name += prefix_len;
       name_len = strlen(lib_name) - suffix_len;
     }
   }
   len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
   agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
   if (agent_entry_name == NULL) {
     return NULL;
   }
   strcpy(agent_entry_name, sym_name);
   if (lib_name != NULL) {
     strcat(agent_entry_name, "_");
     strncat(agent_entry_name, lib_name, name_len);
   }
   return agent_entry_name;
 }
 // Returned string is a constant. For unknown signals "UNKNOWN" is returned.
 const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen) {
   static const struct {
     int sig; const char* name;
   }
   info[] =
   {
     {  SIGABRT,     "SIGABRT" },
 #ifdef SIGAIO
     {  SIGAIO,      "SIGAIO" },
 #endif
     {  SIGALRM,     "SIGALRM" },
 #ifdef SIGALRM1
     {  SIGALRM1,    "SIGALRM1" },
 #endif
     {  SIGBUS,      "SIGBUS" },
 #ifdef SIGCANCEL
     {  SIGCANCEL,   "SIGCANCEL" },
 #endif
     {  SIGCHLD,     "SIGCHLD" },
 #ifdef SIGCLD
     {  SIGCLD,      "SIGCLD" },
 #endif
     {  SIGCONT,     "SIGCONT" },
 #ifdef SIGCPUFAIL
     {  SIGCPUFAIL,  "SIGCPUFAIL" },
 #endif
 #ifdef SIGDANGER
     {  SIGDANGER,   "SIGDANGER" },
 #endif
 #ifdef SIGDIL
     {  SIGDIL,      "SIGDIL" },
 #endif
 #ifdef SIGEMT
     {  SIGEMT,      "SIGEMT" },
 #endif
     {  SIGFPE,      "SIGFPE" },
 #ifdef SIGFREEZE
     {  SIGFREEZE,   "SIGFREEZE" },
 #endif
 #ifdef SIGGFAULT
     {  SIGGFAULT,   "SIGGFAULT" },
 #endif
 #ifdef SIGGRANT
     {  SIGGRANT,    "SIGGRANT" },
 #endif
     {  SIGHUP,      "SIGHUP" },
     {  SIGILL,      "SIGILL" },
     {  SIGINT,      "SIGINT" },
 #ifdef SIGIO
     {  SIGIO,       "SIGIO" },
 #endif
 #ifdef SIGIOINT
     {  SIGIOINT,    "SIGIOINT" },
 #endif
 #ifdef SIGIOT
   // SIGIOT is there for BSD compatibility, but on most Unices just a
   // synonym for SIGABRT. The result should be "SIGABRT", not
   // "SIGIOT".
   #if (SIGIOT != SIGABRT )
     {  SIGIOT,      "SIGIOT" },
   #endif
 #endif
 #ifdef SIGKAP
     {  SIGKAP,      "SIGKAP" },
 #endif
     {  SIGKILL,     "SIGKILL" },
 #ifdef SIGLOST
     {  SIGLOST,     "SIGLOST" },
 #endif
 #ifdef SIGLWP
     {  SIGLWP,      "SIGLWP" },
 #endif
 #ifdef SIGLWPTIMER
     {  SIGLWPTIMER, "SIGLWPTIMER" },
 #endif
 #ifdef SIGMIGRATE
     {  SIGMIGRATE,  "SIGMIGRATE" },
 #endif
 #ifdef SIGMSG
     {  SIGMSG,      "SIGMSG" },
 #endif
     {  SIGPIPE,     "SIGPIPE" },
 #ifdef SIGPOLL
     {  SIGPOLL,     "SIGPOLL" },
 #endif
 #ifdef SIGPRE
     {  SIGPRE,      "SIGPRE" },
 #endif
     {  SIGPROF,     "SIGPROF" },
 #ifdef SIGPTY
     {  SIGPTY,      "SIGPTY" },
 #endif
 #ifdef SIGPWR
     {  SIGPWR,      "SIGPWR" },
 #endif
     {  SIGQUIT,     "SIGQUIT" },
 #ifdef SIGRECONFIG
     {  SIGRECONFIG, "SIGRECONFIG" },
 #endif
 #ifdef SIGRECOVERY
     {  SIGRECOVERY, "SIGRECOVERY" },
 #endif
 #ifdef SIGRESERVE
     {  SIGRESERVE,  "SIGRESERVE" },
 #endif
 #ifdef SIGRETRACT
     {  SIGRETRACT,  "SIGRETRACT" },
 #endif
 #ifdef SIGSAK
     {  SIGSAK,      "SIGSAK" },
 #endif
     {  SIGSEGV,     "SIGSEGV" },
 #ifdef SIGSOUND
     {  SIGSOUND,    "SIGSOUND" },
 #endif
     {  SIGSTOP,     "SIGSTOP" },
     {  SIGSYS,      "SIGSYS" },
 #ifdef SIGSYSERROR
     {  SIGSYSERROR, "SIGSYSERROR" },
 #endif
 #ifdef SIGTALRM
     {  SIGTALRM,    "SIGTALRM" },
 #endif
     {  SIGTERM,     "SIGTERM" },
 #ifdef SIGTHAW
     {  SIGTHAW,     "SIGTHAW" },
 #endif
     {  SIGTRAP,     "SIGTRAP" },
 #ifdef SIGTSTP
     {  SIGTSTP,     "SIGTSTP" },
 #endif
     {  SIGTTIN,     "SIGTTIN" },
     {  SIGTTOU,     "SIGTTOU" },
 #ifdef SIGURG
     {  SIGURG,      "SIGURG" },
 #endif
     {  SIGUSR1,     "SIGUSR1" },
     {  SIGUSR2,     "SIGUSR2" },
 #ifdef SIGVIRT
     {  SIGVIRT,     "SIGVIRT" },
 #endif
     {  SIGVTALRM,   "SIGVTALRM" },
 #ifdef SIGWAITING
     {  SIGWAITING,  "SIGWAITING" },
 #endif
 #ifdef SIGWINCH
     {  SIGWINCH,    "SIGWINCH" },
 #endif
 #ifdef SIGWINDOW
     {  SIGWINDOW,   "SIGWINDOW" },
 #endif
     {  SIGXCPU,     "SIGXCPU" },
     {  SIGXFSZ,     "SIGXFSZ" },
 #ifdef SIGXRES
     {  SIGXRES,     "SIGXRES" },
 #endif
     { -1, NULL }
   };
   const char* ret = NULL;
 #ifdef SIGRTMIN
   if (sig >= SIGRTMIN && sig <= SIGRTMAX) {
     if (sig == SIGRTMIN) {
       ret = "SIGRTMIN";
     } else if (sig == SIGRTMAX) {
       ret = "SIGRTMAX";
     } else {
       jio_snprintf(out, outlen, "SIGRTMIN+%d", sig - SIGRTMIN);
       return out;
     }
   }
 #endif
   if (sig > 0) {
     for (int idx = 0; info[idx].sig != -1; idx ++) {
       if (info[idx].sig == sig) {
         ret = info[idx].name;
         break;
       }
     }
   }
   if (!ret) {
     if (!is_valid_signal(sig)) {
       ret = "INVALID";
     } else {
       ret = "UNKNOWN";
     }
   }
   jio_snprintf(out, outlen, ret);
   return out;
 }
 // Returns true if signal number is valid.
 bool os::Posix::is_valid_signal(int sig) {
   // MacOS not really POSIX compliant: sigaddset does not return
   // an error for invalid signal numbers. However, MacOS does not
   // support real time signals and simply seems to have just 33
   // signals with no holes in the signal range.
 #ifdef __APPLE__
   return sig >= 1 && sig < NSIG;
 #else
   // Use sigaddset to check for signal validity.
   sigset_t set;
   if (sigaddset(&set, sig) == -1 && errno == EINVAL) {
     return false;
   }
   return true;
 #endif
 }
 #define NUM_IMPORTANT_SIGS 32
 // Returns one-line short description of a signal set in a user provided buffer.
 const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) {
   assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size");
   // Note: for shortness, just print out the first 32. That should
   // cover most of the useful ones, apart from realtime signals.
   for (int sig = 1; sig <= NUM_IMPORTANT_SIGS; sig++) {
     const int rc = sigismember(set, sig);
     if (rc == -1 && errno == EINVAL) {
       buffer[sig-1] = '?';
     } else {
       buffer[sig-1] = rc == 0 ? '0' : '1';
     }
   }
   buffer[NUM_IMPORTANT_SIGS] = 0;
   return buffer;
 }
 // Prints one-line description of a signal set.
 void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set) {
   char buf[NUM_IMPORTANT_SIGS + 1];
   os::Posix::describe_signal_set_short(set, buf, sizeof(buf));
   st->print("%s", buf);
 }
 // Writes one-line description of a combination of sigaction.sa_flags into a user
 // provided buffer. Returns that buffer.
 const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size) {
   char* p = buffer;
   size_t remaining = size;
   bool first = true;
   int idx = 0;
   assert(buffer, "invalid argument");
   if (size == 0) {
     return buffer;
   }
   strncpy(buffer, "none", size);
   const struct {
     int i;
     const char* s;
   } flaginfo [] = {
     { SA_NOCLDSTOP, "SA_NOCLDSTOP" },
     { SA_ONSTACK,   "SA_ONSTACK"   },
     { SA_RESETHAND, "SA_RESETHAND" },
     { SA_RESTART,   "SA_RESTART"   },
     { SA_SIGINFO,   "SA_SIGINFO"   },
     { SA_NOCLDWAIT, "SA_NOCLDWAIT" },
     { SA_NODEFER,   "SA_NODEFER"   },
 #ifdef AIX
     { SA_ONSTACK,   "SA_ONSTACK"   },
     { SA_OLDSTYLE,  "SA_OLDSTYLE"  },
 #endif
     { 0, NULL }
   };
   for (idx = 0; flaginfo[idx].s && remaining > 1; idx++) {
     if (flags & flaginfo[idx].i) {
       if (first) {
         jio_snprintf(p, remaining, "%s", flaginfo[idx].s);
         first = false;
       } else {
         jio_snprintf(p, remaining, "|%s", flaginfo[idx].s);
       }
       const size_t len = strlen(p);
       p += len;
       remaining -= len;
     }
   }
   buffer[size - 1] = '\0';
   return buffer;
 }
 // Prints one-line description of a combination of sigaction.sa_flags.
 void os::Posix::print_sa_flags(outputStream* st, int flags) {
   char buffer[0x100];
   os::Posix::describe_sa_flags(flags, buffer, sizeof(buffer));
   st->print("%s", buffer);
 }
 // Helper function for os::Posix::print_siginfo_...():
 // return a textual description for signal code.
 struct enum_sigcode_desc_t {
   const char* s_name;
   const char* s_desc;
 };
 static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out) {
   const struct {
     int sig; int code; const char* s_code; const char* s_desc;
   } t1 [] = {
     { SIGILL,  ILL_ILLOPC,   "ILL_ILLOPC",   "Illegal opcode." },
     { SIGILL,  ILL_ILLOPN,   "ILL_ILLOPN",   "Illegal operand." },
     { SIGILL,  ILL_ILLADR,   "ILL_ILLADR",   "Illegal addressing mode." },
     { SIGILL,  ILL_ILLTRP,   "ILL_ILLTRP",   "Illegal trap." },
     { SIGILL,  ILL_PRVOPC,   "ILL_PRVOPC",   "Privileged opcode." },
     { SIGILL,  ILL_PRVREG,   "ILL_PRVREG",   "Privileged register." },
     { SIGILL,  ILL_COPROC,   "ILL_COPROC",   "Coprocessor error." },
     { SIGILL,  ILL_BADSTK,   "ILL_BADSTK",   "Internal stack error." },
 #if defined(IA64) && defined(LINUX)
     { SIGILL,  ILL_BADIADDR, "ILL_BADIADDR", "Unimplemented instruction address" },
     { SIGILL,  ILL_BREAK,    "ILL_BREAK",    "Application Break instruction" },
 #endif
     { SIGFPE,  FPE_INTDIV,   "FPE_INTDIV",   "Integer divide by zero." },
     { SIGFPE,  FPE_INTOVF,   "FPE_INTOVF",   "Integer overflow." },
     { SIGFPE,  FPE_FLTDIV,   "FPE_FLTDIV",   "Floating-point divide by zero." },
     { SIGFPE,  FPE_FLTOVF,   "FPE_FLTOVF",   "Floating-point overflow." },
     { SIGFPE,  FPE_FLTUND,   "FPE_FLTUND",   "Floating-point underflow." },
     { SIGFPE,  FPE_FLTRES,   "FPE_FLTRES",   "Floating-point inexact result." },
     { SIGFPE,  FPE_FLTINV,   "FPE_FLTINV",   "Invalid floating-point operation." },
     { SIGFPE,  FPE_FLTSUB,   "FPE_FLTSUB",   "Subscript out of range." },
     { SIGSEGV, SEGV_MAPERR,  "SEGV_MAPERR",  "Address not mapped to object." },
     { SIGSEGV, SEGV_ACCERR,  "SEGV_ACCERR",  "Invalid permissions for mapped object." },
 #ifdef AIX
     // no explanation found what keyerr would be
     { SIGSEGV, SEGV_KEYERR,  "SEGV_KEYERR",  "key error" },
 #endif
 #if defined(IA64) && !defined(AIX)
     { SIGSEGV, SEGV_PSTKOVF, "SEGV_PSTKOVF", "Paragraph stack overflow" },
 #endif
     { SIGBUS,  BUS_ADRALN,   "BUS_ADRALN",   "Invalid address alignment." },
     { SIGBUS,  BUS_ADRERR,   "BUS_ADRERR",   "Nonexistent physical address." },
     { SIGBUS,  BUS_OBJERR,   "BUS_OBJERR",   "Object-specific hardware error." },
     { SIGTRAP, TRAP_BRKPT,   "TRAP_BRKPT",   "Process breakpoint." },
     { SIGTRAP, TRAP_TRACE,   "TRAP_TRACE",   "Process trace trap." },
     { SIGCHLD, CLD_EXITED,   "CLD_EXITED",   "Child has exited." },
     { SIGCHLD, CLD_KILLED,   "CLD_KILLED",   "Child has terminated abnormally and did not create a core file." },
     { SIGCHLD, CLD_DUMPED,   "CLD_DUMPED",   "Child has terminated abnormally and created a core file." },
     { SIGCHLD, CLD_TRAPPED,  "CLD_TRAPPED",  "Traced child has trapped." },
     { SIGCHLD, CLD_STOPPED,  "CLD_STOPPED",  "Child has stopped." },
     { SIGCHLD, CLD_CONTINUED,"CLD_CONTINUED","Stopped child has continued." },
 #ifdef SIGPOLL
     { SIGPOLL, POLL_OUT,     "POLL_OUT",     "Output buffers available." },
     { SIGPOLL, POLL_MSG,     "POLL_MSG",     "Input message available." },
     { SIGPOLL, POLL_ERR,     "POLL_ERR",     "I/O error." },
     { SIGPOLL, POLL_PRI,     "POLL_PRI",     "High priority input available." },
     { SIGPOLL, POLL_HUP,     "POLL_HUP",     "Device disconnected. [Option End]" },
 #endif
     { -1, -1, NULL, NULL }
   };
   // Codes valid in any signal context.
   const struct {
     int code; const char* s_code; const char* s_desc;
   } t2 [] = {
     { SI_USER,      "SI_USER",     "Signal sent by kill()." },
     { SI_QUEUE,     "SI_QUEUE",    "Signal sent by the sigqueue()." },
     { SI_TIMER,     "SI_TIMER",    "Signal generated by expiration of a timer set by timer_settime()." },
     { SI_ASYNCIO,   "SI_ASYNCIO",  "Signal generated by completion of an asynchronous I/O request." },
     { SI_MESGQ,     "SI_MESGQ",    "Signal generated by arrival of a message on an empty message queue." },
     // Linux specific
 #ifdef SI_TKILL
     { SI_TKILL,     "SI_TKILL",    "Signal sent by tkill (pthread_kill)" },
 #endif
 #ifdef SI_DETHREAD
     { SI_DETHREAD,  "SI_DETHREAD", "Signal sent by execve() killing subsidiary threads" },
 #endif
 #ifdef SI_KERNEL
     { SI_KERNEL,    "SI_KERNEL",   "Signal sent by kernel." },
 #endif
 #ifdef SI_SIGIO
     { SI_SIGIO,     "SI_SIGIO",    "Signal sent by queued SIGIO" },
 #endif
 #ifdef AIX
     { SI_UNDEFINED, "SI_UNDEFINED","siginfo contains partial information" },
     { SI_EMPTY,     "SI_EMPTY",    "siginfo contains no useful information" },
 #endif
 #ifdef __sun
     { SI_NOINFO,    "SI_NOINFO",   "No signal information" },
     { SI_RCTL,      "SI_RCTL",     "kernel generated signal via rctl action" },
     { SI_LWP,       "SI_LWP",      "Signal sent via lwp_kill" },
 #endif
     { -1, NULL, NULL }
   };
   const char* s_code = NULL;
   const char* s_desc = NULL;
   for (int i = 0; t1[i].sig != -1; i ++) {
     if (t1[i].sig == si->si_signo && t1[i].code == si->si_code) {
       s_code = t1[i].s_code;
       s_desc = t1[i].s_desc;
       break;
     }
   }
   if (s_code == NULL) {
     for (int i = 0; t2[i].s_code != NULL; i ++) {
       if (t2[i].code == si->si_code) {
         s_code = t2[i].s_code;
         s_desc = t2[i].s_desc;
       }
     }
   }
   if (s_code == NULL) {
     out->s_name = "unknown";
     out->s_desc = "unknown";
     return false;
   }
   out->s_name = s_code;
   out->s_desc = s_desc;
   return true;
 }
 // A POSIX conform, platform-independend siginfo print routine.
 // Short print out on one line.
 void os::Posix::print_siginfo_brief(outputStream* os, const siginfo_t* si) {
   char buf[20];
   os->print("siginfo: ");
   if (!si) {
     os->print("<null>");
     return;
   }
   // See print_siginfo_full() for details.
   const int sig = si->si_signo;
   os->print("si_signo: %d (%s)", sig, os::Posix::get_signal_name(sig, buf, sizeof(buf)));
   enum_sigcode_desc_t ed;
   if (get_signal_code_description(si, &ed)) {
     os->print(", si_code: %d (%s)", si->si_code, ed.s_name);
   } else {
     os->print(", si_code: %d (unknown)", si->si_code);
   }
   if (si->si_errno) {
     os->print(", si_errno: %d", si->si_errno);
   }
   const int me = (int) ::getpid();
   const int pid = (int) si->si_pid;
   if (si->si_code == SI_USER || si->si_code == SI_QUEUE) {
     if (IS_VALID_PID(pid) && pid != me) {
       os->print(", sent from pid: %d (uid: %d)", pid, (int) si->si_uid);
     }
   } else if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
              sig == SIGTRAP || sig == SIGFPE) {
     os->print(", si_addr: " PTR_FORMAT, si->si_addr);
 #ifdef SIGPOLL
   } else if (sig == SIGPOLL) {
     os->print(", si_band: " PTR64_FORMAT, (uint64_t)si->si_band);
 #endif
   } else if (sig == SIGCHLD) {
     os->print_cr(", si_pid: %d, si_uid: %d, si_status: %d", (int) si->si_pid, si->si_uid, si->si_status);
   }
 }
 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
   assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
 }
 /*
  * See the caveats for this class in os_posix.hpp
  * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this
  * method and returns false. If none of the signals are raised, returns true.
  * The callback is supposed to provide the method that should be protected.
  */
 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
   sigset_t saved_sig_mask;
   assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
   assert(!WatcherThread::watcher_thread()->has_crash_protection(),
       "crash_protection already set?");
   // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask
   // since on at least some systems (OS X) siglongjmp will restore the mask
   // for the process, not the thread
   pthread_sigmask(0, NULL, &saved_sig_mask);
   if (sigsetjmp(_jmpbuf, 0) == 0) {
     // make sure we can see in the signal handler that we have crash protection
     // installed
     WatcherThread::watcher_thread()->set_crash_protection(this);
     cb.call();
     // and clear the crash protection
     WatcherThread::watcher_thread()->set_crash_protection(NULL);
     return true;
   }
   // this happens when we siglongjmp() back
   pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL);
   WatcherThread::watcher_thread()->set_crash_protection(NULL);
   return false;
 }
 void os::WatcherThreadCrashProtection::restore() {
   assert(WatcherThread::watcher_thread()->has_crash_protection(),
       "must have crash protection");
   siglongjmp(_jmpbuf, 1);
 }
 void os::WatcherThreadCrashProtection::check_crash_protection(int sig,
     Thread* thread) {
   if (thread != NULL &&
       thread->is_Watcher_thread() &&
       WatcherThread::watcher_thread()->has_crash_protection()) {
     if (sig == SIGSEGV || sig == SIGBUS) {
       WatcherThread::watcher_thread()->crash_protection()->restore();
     }
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/os/posix/vm/os_posix.cpp@833b0f92429a (annotated)

src/os/posix/vm/os_posix.cpp