libjava/include/dwarf2-signal.h

   1 // dwarf2-signal.h - Catch runtime signals and turn them into exceptions.
   2
   3 /* Copyright (C) 2000, 2001  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7    Use this file for every target for which the dwarf2 unwinder in
   8    libgcc can unwind through signal handlers and no special actions
   9    are needed.
  10
  11 This software is copyrighted work licensed under the terms of the
  12 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
  13 details.  */
  14
  15 #ifndef JAVA_SIGNAL_H
  16 #define JAVA_SIGNAL_H 1
  17
  18 #include <signal.h>
  19 #include <sys/syscall.h>
  20
  21 #define HANDLE_SEGV 1
  22 #undef HANDLE_FPE
  23
  24 #define SIGNAL_HANDLER(_name)   \
  25 static void _Jv_##_name (int)
  26
  27 class java::lang::Throwable;
  28
  29 // Unwind the stack to the point at which the signal was generated and
  30 // then throw an exception.  With the dwarf2 unwinder we don't need to
  31 // do anything.
  32
  33 #define MAKE_THROW_FRAME(_exception)            \
  34 do                                              \
  35 {                                               \
  36 }                                               \
  37 while (0)
  38
  39
  40 #define INIT_SEGV                                               \
  41 do                                                              \
  42   {                                                             \
  43     nullp = new java::lang::NullPointerException ();            \
  44     struct sigaction act;                                       \
  45     act.sa_handler = _Jv_catch_segv;                            \
  46     sigemptyset (&act.sa_mask);                                 \
  47     act.sa_flags = 0;                                           \
  48     syscall (SYS_sigaction, SIGSEGV, &act, NULL);               \
  49   }                                                             \
  50 while (0)
  51
  52 #define INIT_FPE                                                \
  53 do                                                              \
  54   {                                                             \
  55     arithexception = new java::lang::ArithmeticException        \
  56       (JvNewStringLatin1 ("/ by zero"));                        \
  57     struct sigaction act;                                       \
  58     act.sa_handler = _Jv_catch_fpe;                             \
  59     sigemptyset (&act.sa_mask);                                 \
  60     act.sa_flags = 0;                                           \
  61     syscall (SYS_sigaction, SIGFPE, &act, NULL);                \
  62   }                                                             \
  63 while (0)
  64
  65 /* We use syscall(SYS_sigaction) in INIT_SEGV and INIT_FPE instead of
  66  * sigaction() because on some systems the pthreads wrappers for
  67  * signal handlers are not compiled with unwind information, so it's
  68  * not possible to unwind through them.  This is a problem that will
  69  * go away once all systems have pthreads libraries that are
  70  * compiled with full unwind info.  */
  71
  72 #endif /* JAVA_SIGNAL_H */