X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/40334ce6fe520b2fa7d1e240716e4f34a5fdc74e..3297da9f47ce18371941b2b48a2f4018b4793ced:/include/xbt/ex.h diff --git a/include/xbt/ex.h b/include/xbt/ex.h index ab26a72a12..ed4056626b 100644 --- a/include/xbt/ex.h +++ b/include/xbt/ex.h @@ -1,256 +1,33 @@ -/* ex - Exception Handling */ +/* Copyright (c) 2005-2018. The SimGrid Team. All rights reserved. */ -/* Copyright (c) 2005-2014. The SimGrid Team. - * All rights reserved. */ +/* This program is free software; you can redistribute it and/or modify it + * under the terms of the license (GNU LGPL) which comes with this package. */ -/* Copyright (c) 2002-2004 Ralf S. Engelschall */ -/* Copyright (c) 2002-2004 The OSSP Project */ -/* Copyright (c) 2002-2004 Cable & Wireless */ -/* All rights reserved. */ +#ifndef XBT_EX_H +#define XBT_EX_H -/* This code is inspirated from the OSSP version (as retrieved back in 2004)*/ -/* It was heavily modified to fit the SimGrid framework. */ +#include -/* The OSSP version has the following copyright notice: -** OSSP ex - Exception Handling -** Copyright (c) 2002-2004 Ralf S. Engelschall -** Copyright (c) 2002-2004 The OSSP Project -** Copyright (c) 2002-2004 Cable & Wireless -** -** This file is part of OSSP ex, an exception handling library -** which can be found at http://www.ossp.org/pkg/lib/ex/. -** -** Permission to use, copy, modify, and distribute this software for -** any purpose with or without fee is hereby granted, provided that -** the above copyright notice and this permission notice appear in all -** copies. -** -** THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESSED OR IMPLIED -** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF -** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. -** IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR -** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF -** USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND -** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, -** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT -** OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF -** SUCH DAMAGE. - */ - -/* The extensions made for the SimGrid project can either be distributed */ -/* under the same license, or under the LGPL v2.1 */ - -#ifndef __XBT_EX_H__ -#define __XBT_EX_H__ - -#include "xbt/sysdep.h" -#include "xbt/misc.h" -#include "xbt/virtu.h" +#include +#include +#include +#include -SG_BEGIN_DECL() - -/*-*-* Emergency debuging: define this when the exceptions get crazy *-*-*/ -#undef __EX_MAYDAY -#ifdef __EX_MAYDAY -# include -#include -# define MAYDAY_SAVE(m) printf("%d %s:%d save %p\n", \ - xbt_getpid(), __FILE__, __LINE__, \ - (m)->jb \ - ), -# define MAYDAY_RESTORE(m) printf("%d %s:%d restore %p\n", \ - xbt_getpid(), __FILE__, __LINE__, \ - (m)->jb \ - ), -# define MAYDAY_CATCH(e) printf("%d %s:%d Catched '%s'\n", \ - xbt_getpid(), __FILE__, __LINE__, \ - (e).msg \ - ), -#else -# define MAYDAY_SAVE(m) -# define MAYDAY_RESTORE(m) -# define MAYDAY_CATCH(e) -#endif -/*-*-* end of debugging stuff *-*-*/ -#if defined(__EX_MCTX_MCSC__) -#include /* POSIX.1 ucontext(3) */ -#define __ex_mctx_struct ucontext_t uc; -#define __ex_mctx_save(mctx) (getcontext(&(mctx)->uc) == 0) -#define __ex_mctx_restored(mctx) /* noop */ -#define __ex_mctx_restore(mctx) (void)setcontext(&(mctx)->uc) -#elif defined(__EX_MCTX_SSJLJ__) -#include /* POSIX.1 sigjmp_buf(3) */ -#define __ex_mctx_struct sigjmp_buf jb; -#define __ex_mctx_save(mctx) (sigsetjmp((mctx)->jb, 1) == 0) -#define __ex_mctx_restored(mctx) /* noop */ -#define __ex_mctx_restore(mctx) (void)siglongjmp((mctx)->jb, 1) -#elif defined(__EX_MCTX_SJLJ__) || !defined(__EX_MCTX_CUSTOM__) || defined(__EX_MAYDAY) -#include /* ISO-C jmp_buf(3) */ -#define __ex_mctx_struct jmp_buf jb; -#define __ex_mctx_save(mctx) ( MAYDAY_SAVE(mctx) setjmp((mctx)->jb) == 0) -#define __ex_mctx_restored(mctx) /* noop */ -#define __ex_mctx_restore(mctx) ( MAYDAY_RESTORE(mctx) (void)longjmp((mctx)->jb, 1)) -#endif -/* declare the machine context type */ -typedef struct { -__ex_mctx_struct} __ex_mctx_t; - -/** @addtogroup XBT_ex - * @brief A set of macros providing exception a la C++ in ANSI C (grounding feature) - * - * This module is a small ISO-C++ style exception handling library - * for use in the ISO-C language. It allows you to use the paradigm - * of throwing and catching exceptions in order to reduce the amount - * of error handling code without hindering program robustness. - * - * This is achieved by directly transferring exceptional return codes - * (and the program control flow) from the location where the exception - * is raised (throw point) to the location where it is handled (catch - * point) -- usually from a deeply nested sub-routine to a parent - * routine. All intermediate routines no longer have to make sure that - * the exceptional return codes from sub-routines are correctly passed - * back to the parent. - * - * These features are brought to you by a modified version of the libex - * library, one of the numerous masterpiece of Ralf S. Engelschall. - * - * \htmlonly
\endhtmlonly - * - * @section XBT_ex_toc TABLE OF CONTENTS - * - * - \ref XBT_ex_intro - * - \ref XBT_ex_base - * - \ref XBT_ex_pitfalls - * - * \htmlonly
\endhtmlonly - * - * @section XBT_ex_intro DESCRIPTION - * - * In SimGrid, an exception is a triple <\a msg , \a category , \a value> - * where \a msg is a human-readable text describing the exceptional - * condition, \a code an integer describing what went wrong and \a value - * providing a sort of sub-category. (this is different in the original libex). - * - * @section XBT_ex_base BASIC USAGE - * - * \em TRY \b TRIED_BLOCK [\em TRY_CLEANUP \b CLEANUP_BLOCK] \em CATCH (variable) \b CATCH_BLOCK +/** @addtogroup XBT_ex_c + * @brief Exceptions support (C) * - * This is the primary syntactical construct provided. It is modeled after the - * ISO-C++ try-catch clause and should sound familiar to most of you. - * - * Any exception thrown directly from the TRIED_BLOCK block or from called - * subroutines is caught. Cleanups which must be done after this block - * (whenever an exception arose or not) should be placed into the optionnal - * CLEANUP_BLOCK. The code dealing with the exceptions when they arise should - * be placed into the (mandatory) CATCH_BLOCK. - * - * - * In absence of exception, the control flow goes into the blocks TRIED_BLOCK - * and CLEANUP_BLOCK (if present); The CATCH_BLOCK block is then ignored. - * - * When an exception is thrown, the control flow goes through the following - * blocks: TRIED_BLOCK (up to the statement throwing the exception), - * CLEANUP_BLOCK (if any) and CATCH_BLOCK. The exception is stored in a - * variable for inspection inside the CATCH_BLOCK. This variable must be - * declared in the outter scope, but its value is only valid within the - * CATCH_BLOCK block. - * - * Some notes: - * - TRY, CLEANUP and CATCH cannot be used separately, they work - * only in combination and form a language clause as a whole. - * - In contrast to the syntax of other languages (such as C++ or Jave) there - * is only one CATCH block and not multiple ones (all exceptions are - * of the same \em xbt_ex_t C type). - * - the variable of CATCH can naturally be reused in subsequent - * CATCH clauses. - * - it is possible to nest TRY clauses. - * - * The TRY block is a regular ISO-C language statement block, but - * - *
it is not - * allowed to jump into it via "goto" or longjmp(3) or out of it via "break", - * "return", "goto" or longjmp(3).
- * - * This is because there is some hidden setup and - * cleanup that needs to be done regardless of whether an exception is - * caught. Bypassing these steps will break the exception handling facility. - * The symptom are likely to be a segfault at the next exception raising point, - * ie far away from the point where you did the mistake. If you suspect - * that kind of error in your code, have a look at the little script - * tools/xbt_exception_checker in the CVS. It extracts all the TRY - * blocks from a set of C files you give it and display them (and only - * them) on the standard output. You can then grep for the forbidden - * keywords on that output. - * - * The CLEANUP and CATCH blocks are regular ISO-C language statement - * blocks without any restrictions. You are even allowed to throw (and, in the - * CATCH block, to re-throw) exceptions. - * - * There is one subtle detail you should remember about TRY blocks: - * Variables used in the CLEANUP or CATCH clauses must be declared with - * the storage class "volatile", otherwise they might contain outdated - * information if an exception is thrown. - * - * - * This is because you usually do not know which commands in the TRY - * were already successful before the exception was thrown (logically speaking) - * and because the underlying ISO-C setjmp(3) facility applies those - * restrictions (technically speaking). As a matter of fact, value changes - * between the TRY and the THROW may be discarded if you forget the - * "volatile" keyword. - * - * \section XBT_ex_pitfalls PROGRAMMING PITFALLS - * - * Exception handling is a very elegant and efficient way of dealing with - * exceptional situation. Nevertheless it requires additional discipline in - * programming and there are a few pitfalls one must be aware of. Look the - * following code which shows some pitfalls and contains many errors (assuming - * a mallocex() function which throws an exception if malloc(3) fails): - * - * \dontinclude ex.c - * \skip BAD_EXAMPLE - * \until end_of_bad_example - * - * This example raises a few issues: - * -# \b variable \b scope \n - * Variables which are used in the CLEANUP or CATCH clauses must be - * declared before the TRY clause, otherwise they only exist inside the - * TRY block. In the example above, cp1, cp2 and cp3 only exist in the - * TRY block and are invisible from the CLEANUP and CATCH - * blocks. - * -# \b variable \b initialization \n - * Variables which are used in the CLEANUP or CATCH clauses must - * be initialized before the point of the first possible THROW is - * reached. In the example above, CLEANUP would have trouble using cp3 - * if mallocex() throws a exception when allocating a TOOBIG buffer. - * -# \b volatile \b variable \n - * Variables which are used in the CLEANUP or CATCH clauses MUST BE - * DECLARED AS "volatile", otherwise they might contain outdated - * information when an exception is thrown. - * -# \b clean \b before \b catch \n - * The CLEANUP clause is not only place before the CATCH clause in - * the source code, it also occures before in the control flow. So, - * resources being cleaned up cannot be used in the CATCH block. In the - * example, c3 gets freed before the printf placed in CATCH. - * -# \b variable \b uninitialization \n - * If resources are passed out of the scope of the - * TRY/CLEANUP/CATCH construct, they naturally shouldn't get - * cleaned up. The example above does free(3) cp1 in CLEANUP although - * its value was affected to globalcontext->first, invalidating this - * pointer. + * Those fonctions are used to throw C++ exceptions from C code. This feature + * should probably be removed in the future because C and exception do not + * exactly play nicely together. + */ - * The following is fixed version of the code (annotated with the pitfall items - * for reference): +/** Categories of errors * - * \skip GOOD_EXAMPLE - * \until end_of_good_example + * This very similar to std::error_catgory and should probably be replaced + * by this in the future. * - * @{ + * @ingroup XBT_ex_c */ - -/** @brief different kind of errors */ typedef enum { unknown_error = 0, /**< unknown error */ arg_error, /**< Invalid argument */ @@ -268,244 +45,50 @@ typedef enum { vm_error /**< vm error */ } xbt_errcat_t; -XBT_PUBLIC(const char *) xbt_ex_catname(xbt_errcat_t cat); - -/** @brief Structure describing an exception */ -typedef struct { - char *msg; /**< human readable message */ - xbt_errcat_t category; /**< category like HTTP (what went wrong) */ - int value; /**< like errno (why did it went wrong) */ - /* throw point */ - char *procname; /**< Name of the process who thrown this */ - int pid; /**< PID of the process who thrown this */ - char *file; /**< Thrown point */ - int line; /**< Thrown point */ - char *func; /**< Thrown point */ - /* Backtrace */ - int used; - char **bt_strings; /* only filed on display (or before the network propagation) */ - void *bt[XBT_BACKTRACE_SIZE]; -} xbt_ex_t; +SG_BEGIN_DECL() -/* declare the running context type - * (that's where we get the process name for the logs and the exception storage) - * -- do not mess with it -- +/** Get the name of a category + * @ingroup XBT_ex_c */ -typedef struct { - __ex_mctx_t *ctx_mctx; /* permanent machine context of enclosing try/catch */ - int ctx_caught; /* temporary flag whether exception was caught */ - volatile xbt_ex_t exception; /* temporary exception storage */ -} xbt_running_ctx_t; +XBT_PUBLIC const char* xbt_ex_catname(xbt_errcat_t cat); -/* the static and dynamic initializers for a context structure */ -#define XBT_RUNNING_CTX_INITIALIZER \ - { NULL, 0, { /* content */ NULL, unknown_error, 0, \ - /* throw point*/ NULL, 0, NULL, 0, NULL, \ - /* backtrace */ 0, NULL, /* bt[] */ } } +typedef struct xbt_ex xbt_ex_t; -XBT_PUBLIC_DATA(const xbt_running_ctx_t) __xbt_ex_ctx_initializer; -#define XBT_RUNNING_CTX_INITIALIZE(ctx) (*(ctx) = __xbt_ex_ctx_initializer) +/** Helper function used to throw exceptions in C */ +XBT_ATTRIB_NORETURN XBT_PUBLIC void _xbt_throw(char* message, xbt_errcat_t errcat, int value, const char* file, + int line, const char* func); -/* the exception context */ -typedef xbt_running_ctx_t *(*xbt_running_ctx_fetcher_t) (void); -XBT_PUBLIC_DATA(xbt_running_ctx_fetcher_t) __xbt_running_ctx_fetch; -XBT_PUBLIC( xbt_running_ctx_t *)__xbt_ex_ctx_default(void); - -/* the termination handler */ -typedef void (*ex_term_cb_t) (xbt_ex_t *); -XBT_PUBLIC_DATA(ex_term_cb_t) __xbt_ex_terminate; -XBT_PUBLIC( void )__xbt_ex_terminate_default(xbt_ex_t * e); - -/** @brief Introduce a block where exception may be dealed with +/** Builds and throws an exception + * @ingroup XBT_ex_c * @hideinitializer */ -#define TRY \ - { \ - xbt_running_ctx_t *__xbt_ex_ctx_ptr = __xbt_running_ctx_fetch(); \ - int __ex_cleanup = 0; \ - __ex_mctx_t __ex_mctx_me; \ - __ex_mctx_t * __ex_mctx_en = __xbt_ex_ctx_ptr->ctx_mctx; \ - __xbt_ex_ctx_ptr->ctx_mctx = &__ex_mctx_me; \ - if (__ex_mctx_save(&__ex_mctx_me)) { \ - if (1) +#define THROW(c, v) { _xbt_throw(NULL, (xbt_errcat_t) c, v, __FILE__, __LINE__, __func__); } -/** @brief optional(!) block for cleanup +/** Builds and throws an exception with a printf-like formatted message + * @ingroup XBT_ex_c * @hideinitializer */ -#define TRY_CLEANUP \ - else { \ - } \ - __xbt_ex_ctx_ptr->ctx_caught = 0; \ - } else { \ - __ex_mctx_restored(&__ex_mctx_me); \ - __xbt_ex_ctx_ptr->ctx_caught = 1; \ - } \ - __xbt_ex_ctx_ptr->ctx_mctx = __ex_mctx_en; \ - __ex_cleanup = 1; \ - if (1) { \ - if (1) +#define THROWF(c, v, ...) _xbt_throw(bprintf(__VA_ARGS__), (xbt_errcat_t) c, v, __FILE__, __LINE__, __func__) -#ifndef DOXYGEN_SKIP -# ifdef __cplusplus -# define XBT_EX_T_CPLUSPLUSCAST (xbt_ex_t&) -# else -# define XBT_EX_T_CPLUSPLUSCAST -# endif -#endif - -/** @brief the block for catching (ie, deal with) an exception - * @hideinitializer +XBT_ATTRIB_NORETURN void xbt_throw_impossible(const char* file, int line, const char* func); +/** Throw an exception because something impossible happened + * @ingroup XBT_ex_c */ -#define CATCH(e) \ - DO_CATCH((e) = XBT_EX_T_CPLUSPLUSCAST __xbt_running_ctx_fetch()->exception) +#define THROW_IMPOSSIBLE xbt_throw_impossible(__FILE__, __LINE__, __func__) -/** @brief like CATCH(e) but without argument - * @hideinitializer - * - * Useful if you only want to rethrow the exception caught, and do not want to - * bother with an unused variable. +/** Throw an exception because something unimplemented stuff has been attempted + * @ingroup XBT_ex_c */ -#define CATCH_ANONYMOUS DO_CATCH(0) - -#define DO_CATCH(_xbt_do_catch_set_e) \ - else { \ - } \ - if (!(__ex_cleanup)) \ - __xbt_ex_ctx_ptr->ctx_caught = 0; \ - } else { \ - if (!(__ex_cleanup)) { \ - __ex_mctx_restored(&__ex_mctx_me); \ - __xbt_ex_ctx_ptr->ctx_caught = 1; \ - } \ - } \ - __xbt_ex_ctx_ptr->ctx_mctx = __ex_mctx_en; \ - } \ - if ( !(__xbt_running_ctx_fetch()->ctx_caught) \ - || ((void)(_xbt_do_catch_set_e), \ - MAYDAY_CATCH(__xbt_running_ctx_fetch()->exception) 0)) { \ - } \ - else - -#define DO_THROW(running_ctx) \ - do { /* deal with the exception */ \ - xbt_running_ctx_t *ctx = (running_ctx); \ - if (ctx->ctx_mctx == NULL) \ - __xbt_ex_terminate((xbt_ex_t*)&(ctx->exception)); /* not catched */ \ - else \ - __ex_mctx_restore(ctx->ctx_mctx); /* catched somewhere */ \ - abort(); /* nope, stupid GCC, we won't survive a THROW */ \ - /* (this won't be reached) */ \ - } while(0) +XBT_ATTRIB_NORETURN void xbt_throw_unimplemented(const char* file, int line, const char* func); +#define THROW_UNIMPLEMENTED xbt_throw_unimplemented(__FILE__, __LINE__, __func__) -/** @brief Helper macro for THROW and THROWF - * @hideinitializer - * - * @param _throw_ctx: the throwing context in which we should construct the exception - * @param c: category code (integer) - * @param v: value (integer) - * @param m: message text - * - * If called from within a TRY/CATCH construct, this exception - * is copied into the CATCH relevant variable program control flow - * is derouted to the CATCH (after the optional sg_cleanup). - * - * If no TRY/CATCH construct embeds this call, the program calls - * abort(3). - * - * The THROW can be performed everywhere, including inside TRY, - * CLEANUP and CATCH blocks. +/** Die because something impossible happened + * @ingroup XBT_ex_c */ - -#define THROW_PREPARE(_throw_ctx, c, v, m) \ - /* build the exception */ \ - _throw_ctx->exception.msg = (m); \ - _throw_ctx->exception.category = (xbt_errcat_t)(c); \ - _throw_ctx->exception.value = (v); \ - _throw_ctx->exception.procname = (char*)xbt_procname(); \ - _throw_ctx->exception.pid = xbt_getpid(); \ - _throw_ctx->exception.file = (char*)__FILE__; \ - _throw_ctx->exception.line = __LINE__; \ - _throw_ctx->exception.func = (char*)_XBT_FUNCTION; \ - _throw_ctx->exception.bt_strings = NULL; \ - xbt_backtrace_current((xbt_ex_t *)&(_throw_ctx->exception)); - -#define _THROW(c, v, m) \ - do { /* change this sequence into one block */ \ - xbt_running_ctx_t *_throw_ctx = __xbt_running_ctx_fetch(); \ - THROW_PREPARE(_throw_ctx, c, v, m); \ - DO_THROW(_throw_ctx); \ - } while (0) - -/** @brief Builds and throws an exception - @hideinitializer */ -#define THROW(c, v) _THROW(c, v, NULL) - -/** @brief Builds and throws an exception with a printf-like formatted message - @hideinitializer */ -#define THROWF(c, v, ...) _THROW(c, v, bprintf(__VA_ARGS__)) - -#define THROW_IMPOSSIBLE \ - THROWF(unknown_error, 0, "The Impossible Did Happen (yet again)") -#define THROW_UNIMPLEMENTED \ - THROWF(unknown_error, 0, "Function %s unimplemented",_XBT_FUNCTION) - #define DIE_IMPOSSIBLE xbt_die("The Impossible Did Happen (yet again)") -/** @brief re-throwing of an already caught exception (ie, pass it to the upper catch block) - * @hideinitializer - */ -#define RETHROW DO_THROW(__xbt_running_ctx_fetch()) - -/** @brief like THROWF, but adding some details to the message of an existing exception - * @hideinitializer - */ -#define RETHROWF(...) \ - do { \ - char *_xbt_ex_internal_msg = __xbt_running_ctx_fetch()->exception.msg; \ - __xbt_running_ctx_fetch()->exception.msg = bprintf(__VA_ARGS__, \ - _xbt_ex_internal_msg); \ - free(_xbt_ex_internal_msg); \ - RETHROW; \ - } while (0) - -/** @brief Exception destructor */ -XBT_PUBLIC(void) xbt_ex_free(xbt_ex_t e); -/** @brief The display made by an exception that is not catched */ -XBT_PUBLIC(void) xbt_ex_display(xbt_ex_t * e); - -/** @brief Shows a backtrace of the current location */ -XBT_PUBLIC(void) xbt_backtrace_display_current(void); -/** @brief reimplementation of glibc backtrace based directly on gcc library, without implicit malloc */ -XBT_PUBLIC(int) xbt_backtrace_no_malloc(void**bt, int size); -/** @brief Captures a backtrace for further use */ -XBT_PUBLIC(void) xbt_backtrace_current(xbt_ex_t * e); -/** @brief Display a previously captured backtrace */ -XBT_PUBLIC(void) xbt_backtrace_display(xbt_ex_t * e); -/** @brief Get current backtrace with libunwind */ -XBT_PUBLIC(int) xbt_libunwind_backtrace(void *bt[XBT_BACKTRACE_SIZE], int size); - -#ifdef XBT_USE_DEPRECATED - -/* Kept for backward compatibility. */ - -#define THROW0(c, v, m) \ - do { if (m) THROWF(c, v, m); else THROW(c, v); } while (0) -#define THROW1(c, v, ...) THROWF(c, v, __VA_ARGS__) -#define THROW2(c, v, ...) THROWF(c, v, __VA_ARGS__) -#define THROW3(c, v, ...) THROWF(c, v, __VA_ARGS__) -#define THROW4(c, v, ...) THROWF(c, v, __VA_ARGS__) -#define THROW5(c, v, ...) THROWF(c, v, __VA_ARGS__) -#define THROW6(c, v, ...) THROWF(c, v, __VA_ARGS__) -#define THROW7(c, v, ...) THROWF(c, v, __VA_ARGS__) - -#define RETHROW0(...) RETHROWF(__VA_ARGS__) -#define RETHROW1(...) RETHROWF(__VA_ARGS__) -#define RETHROW2(...) RETHROWF(__VA_ARGS__) -#define RETHROW3(...) RETHROWF(__VA_ARGS__) -#define RETHROW4(...) RETHROWF(__VA_ARGS__) -#define RETHROW5(...) RETHROWF(__VA_ARGS__) - -#endif +/** Display an exception */ +XBT_PUBLIC void xbt_ex_display(xbt_ex_t* e); SG_END_DECL()