X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/2eeb460a4bad7a20e247006d5165879efb1957ac..b3b356352e87ae00a20f737c48e19b0c8413455a:/src/xbt/backtrace_linux.c diff --git a/src/xbt/backtrace_linux.c b/src/xbt/backtrace_linux.c index e57e486018..82a3c6660f 100644 --- a/src/xbt/backtrace_linux.c +++ b/src/xbt/backtrace_linux.c @@ -1,17 +1,25 @@ /* backtrace_linux - backtrace displaying on linux platform */ /* This file is included by ex.c on need (have execinfo.h, popen & addrline)*/ -/* Copyright (c) 2008, 2009, 2010. The SimGrid Team. +/* Copyright (c) 2008-2015. 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. */ +#include +#include + /* This file is to be included in ex.c, so the following headers are not mandatory, but it's to make sure that eclipse see them too */ #include "xbt/ex.h" +#include "xbt/log.h" #include "xbt/str.h" #include "xbt/module.h" /* xbt_binary_name */ #include "xbt_modinter.h" /* backtrace initialization headers */ +#ifdef HAVE_MC +#define UNW_LOCAL_ONLY +#include +#endif /* end of "useless" inclusions */ extern char **environ; /* the environment, as specified by the opengroup */ @@ -25,13 +33,70 @@ void xbt_backtrace_postexit(void) { } +#include +struct trace_arg { + void **array; + int cnt, size; +}; + +static _Unwind_Reason_Code +backtrace_helper (struct _Unwind_Context *ctx, void *a) +{ + struct trace_arg *arg = a; + + /* We are first called with address in the __backtrace function. + Skip it. */ + if (arg->cnt != -1) + { + arg->array[arg->cnt] = (void *) _Unwind_GetIP(ctx); + + /* Check whether we make any progress. */ + if (arg->cnt > 0 && arg->array[arg->cnt - 1] == arg->array[arg->cnt]) + return _URC_END_OF_STACK; + } + if (++arg->cnt == arg->size) + return _URC_END_OF_STACK; + return _URC_NO_REASON; +} + +/** @brief reimplementation of glibc backtrace based directly on gcc library, without implicit malloc + * + * See http://webloria.loria.fr/~quinson/blog/2012/0208/system_programming_fun_in_SimGrid/ + * for the motivation behind this function + * */ + +int xbt_backtrace_no_malloc(void **array, int size) { + + int i = 0; + for(i=0; i < size; i++) + array[i] = NULL; + + struct trace_arg arg = { .array = array, .size = size, .cnt = -1 }; + + if (size >= 1) + _Unwind_Backtrace(backtrace_helper, &arg); + + /* _Unwind_Backtrace on IA-64 seems to put NULL address above + _start. Fix it up here. */ + if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL) + --arg.cnt; + return arg.cnt != -1 ? arg.cnt : 0; +} + void xbt_backtrace_current(xbt_ex_t * e) { e->used = backtrace((void **) e->bt, XBT_BACKTRACE_SIZE); + if (e->used == 0) { + fprintf(stderr, "The backtrace() function failed, which probably means that the memory is exhausted. Here is a crude dump of the exception that I was trying to build:"); + fprintf(stderr, "%s(%d) [%s:%d] %s", + e->procname, e->pid, e->file, e->line, e->msg); + fprintf(stderr, "Bailing out now since there is nothing I can do without a decent amount of memory. Please go fix the memleaks\n"); + exit(1); + } } -void xbt_ex_setup_backtrace(xbt_ex_t * e) +void xbt_ex_setup_backtrace(xbt_ex_t * e) //FIXME: This code could be greatly improved/simplifyied with http://cairo.sourcearchive.com/documentation/1.9.4/backtrace-symbols_8c-source.html { int i; @@ -43,7 +108,7 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e) /* to extract the addresses from the backtrace */ char **addrs; - char buff[256], *p; + char buff[256]; /* To read the output of addr2line */ FILE *pipe; @@ -56,29 +121,25 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e) struct stat stat_buf; char *binary_name = NULL; - xbt_assert(e - && e->used, - "Backtrace not setup yet, cannot set it up for display"); + xbt_assert(e, "Backtrace not setup yet, cannot set it up for display"); + + e->bt_strings = NULL; - if (!xbt_binary_name) /* no binary name, nothing to do */ + if (xbt_binary_name == NULL) /* no binary name, nothing to do */ return; - backtrace_syms = backtrace_symbols(e->bt, e->used); - /* ignore first one, which is this xbt_backtrace_current() */ - e->used--; - memmove(backtrace_syms, backtrace_syms + 1, sizeof(char *) * e->used); + if (e->used <= 1) + return; - e->bt_strings = NULL; + /* ignore first one, which is xbt_backtrace_current() */ + e->used--; + memmove(e->bt, e->bt + 1, (sizeof *e->bt) * e->used); - /* Some arches only have stubs of backtrace, no implementation (hppa comes to mind) */ - if (!e->used) - return; + backtrace_syms = backtrace_symbols(e->bt, e->used); /* build the commandline */ if (stat(xbt_binary_name, &stat_buf)) { /* Damn. binary not in current dir. We'll have to dig the PATH to find it */ - int i; - for (i = 0; environ[i]; i++) { if (!strncmp("PATH=", environ[i], 5)) { xbt_dynar_t path = xbt_str_split(environ[i] + 5, ":"); @@ -86,8 +147,7 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e) char *data; xbt_dynar_foreach(path, cpt, data) { - if (binary_name) - free(binary_name); + free(binary_name); binary_name = bprintf("%s/%s", data, xbt_binary_name); if (!stat(binary_name, &stat_buf)) { /* Found. */ @@ -103,7 +163,7 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e) e->bt_strings = xbt_new(char *, 1); e->bt_strings[0] = - bprintf("(binary '%s' not found the path)", xbt_binary_name); + bprintf("(binary '%s' not found in the PATH)", xbt_binary_name); free(backtrace_syms); return; } @@ -122,6 +182,7 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e) addrs = xbt_new(char *, e->used); for (i = 0; i < e->used; i++) { + char *p; /* retrieve this address */ XBT_DEBUG("Retrieving address number %d from '%s'", i, backtrace_syms[i]); snprintf(buff, 256, "%s", strchr(backtrace_syms[i], '[') + 1); @@ -144,27 +205,25 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e) XBT_VERB("Fire a first command: '%s'", cmd); pipe = popen(cmd, "r"); if (!pipe) { - XBT_CRITICAL("Cannot fork addr2line to display the backtrace"); - abort(); + xbt_die("Cannot fork addr2line to display the backtrace"); } for (i = 0; i < e->used; i++) { - char *fgets_res; XBT_DEBUG("Looking for symbol %d, addr = '%s'", i, addrs[i]); - fgets_res = fgets(line_func, 1024, pipe); - if (fgets_res == NULL) - THROWF(system_error, 0, - "Cannot run fgets to look for symbol %d, addr %s", i, - addrs[i]); - line_func[strlen(line_func) - 1] = '\0'; - fgets_res = fgets(line_pos, 1024, pipe); - if (fgets_res == NULL) - THROWF(system_error, 0, - "Cannot run fgets to look for symbol %d, addr %s", i, - addrs[i]); - line_pos[strlen(line_pos) - 1] = '\0'; - - if (strcmp("??", line_func)) { + if (fgets(line_func, 1024, pipe)) { + line_func[strlen(line_func) - 1] = '\0'; + } else { + XBT_VERB("Cannot run fgets to look for symbol %d, addr %s", i, addrs[i]); + strcpy(line_func, "???"); + } + if (fgets(line_pos, 1024, pipe)) { + line_pos[strlen(line_pos) - 1] = '\0'; + } else { + XBT_VERB("Cannot run fgets to look for symbol %d, addr %s", i, addrs[i]); + strcpy(line_pos, backtrace_syms[i]); + } + + if (strcmp("??", line_func) != 0) { XBT_DEBUG("Found static symbol %s() at %s", line_func, line_pos); e->bt_strings[i] = bprintf("** In %s() at %s", line_func, line_pos); @@ -254,19 +313,20 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e) XBT_VERB("Fire a new command: '%s'", subcmd); subpipe = popen(subcmd, "r"); if (!subpipe) { - XBT_CRITICAL("Cannot fork addr2line to display the backtrace"); - abort(); + xbt_die("Cannot fork addr2line to display the backtrace"); + } + if (fgets(line_func, 1024, subpipe)) { + line_func[strlen(line_func) - 1] = '\0'; + } else { + XBT_VERB("Cannot read result of subcommand %s", subcmd); + strcpy(line_func, "???"); + } + if (fgets(line_pos, 1024, subpipe)) { + line_pos[strlen(line_pos) - 1] = '\0'; + } else { + XBT_VERB("Cannot read result of subcommand %s", subcmd); + strcpy(line_pos, backtrace_syms[i]); } - fgets_res = fgets(line_func, 1024, subpipe); - if (fgets_res == NULL) - THROWF(system_error, 0, "Cannot read result of subcommand %s", - subcmd); - line_func[strlen(line_func) - 1] = '\0'; - fgets_res = fgets(line_pos, 1024, subpipe); - if (fgets_res == NULL) - THROWF(system_error, 0, "Cannot read result of subcommand %s", - subcmd); - line_pos[strlen(line_pos) - 1] = '\0'; pclose(subpipe); free(subcmd); } @@ -313,3 +373,37 @@ void xbt_ex_setup_backtrace(xbt_ex_t * e) free(backtrace_syms); free(cmd); } + +#ifdef HAVE_MC + +int xbt_libunwind_backtrace(void* bt[XBT_BACKTRACE_SIZE], int size){ + + int i = 0; + for(i=0; i < size; i++) + bt[i] = NULL; + + i=0; + + unw_cursor_t c; + unw_context_t uc; + + unw_getcontext (&uc); + unw_init_local (&c, &uc); + + unw_word_t ip; + + unw_step(&c); + + while(unw_step(&c) >= 0 && i < size){ + + unw_get_reg(&c, UNW_REG_IP, &ip); + bt[i] = (void*)(long)ip; + i++; + + } + + return i; + +} + +#endif