+++ /dev/null
-/* backtrace_linux - backtrace displaying on linux platform */
-/* This file is included by ex.cpp on need (have execinfo.h, popen & addrline)*/
-
-/* 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 <unistd.h>
-#include <execinfo.h>
-#include <sys/stat.h>
-
-/* This file is to be included in ex.cpp, 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 "src/xbt_modinter.h" /* backtrace initialization headers */
-#if HAVE_MC
-#define UNW_LOCAL_ONLY
-#include <libunwind.h>
-#endif
-/* end of "useless" inclusions */
-
-extern char **environ; /* the environment, as specified by the opengroup */
-
-/* Module creation/destruction: nothing to do on linux */
-void xbt_backtrace_preinit(void)
-{
-}
-
-void xbt_backtrace_postexit(void)
-{
-}
-
-#include <unwind.h>
-struct trace_arg {
- void **array;
- int cnt, size;
-};
-
-static _Unwind_Reason_Code
-backtrace_helper (struct _Unwind_Context *ctx, void *a)
-{
- struct trace_arg *arg = (struct trace_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;
- arg .array = array;
- arg.size = size;
- arg.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)
-{
- void* bt[XBT_BACKTRACE_SIZE];
- std::size_t used = backtrace((void **) bt, XBT_BACKTRACE_SIZE);
- e->bt.assign(bt, bt + used);
- if (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.c_str(), e->pid, e->file, e->line, e->what());
- 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) //FIXME: This code could be greatly improved/simplifyied with http://cairo.sourcearchive.com/documentation/1.9.4/backtrace-symbols_8c-source.html
-{
- /* to get the backtrace from the libc */
- char **backtrace_syms;
-
- /* To build the commandline of addr2line */
- char *cmd, *curr;
-
- /* to extract the addresses from the backtrace */
- char **addrs;
- char buff[256];
-
- /* To read the output of addr2line */
- FILE *pipe;
- char line_func[1024], line_pos[1024];
-
- /* size (in char) of pointers on this arch */
- int addr_len = 0;
-
- /* To search for the right executable path when not trivial */
- struct stat stat_buf;
- char *binary_name = NULL;
-
- xbt_assert(e, "Backtrace not setup yet, cannot set it up for display");
-
- e->bt_strings.clear();
-
- if (xbt_binary_name == NULL) /* no binary name, nothing to do */
- return;
-
- if (e->bt.empty())
- return;
-
- /* ignore first one, which is xbt_backtrace_current() */
- e->bt.erase(e->bt.begin());
-
- backtrace_syms = backtrace_symbols(e->bt.data(), e->bt.size());
-
- /* 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 */
- for (std::size_t i = 0; environ[i]; i++) {
- if (!strncmp("PATH=", environ[i], 5)) {
- xbt_dynar_t path = xbt_str_split(environ[i] + 5, ":");
- unsigned int cpt;
- char *data;
-
- xbt_dynar_foreach(path, cpt, data) {
- free(binary_name);
- binary_name = bprintf("%s/%s", data, xbt_binary_name);
- if (!stat(binary_name, &stat_buf)) {
- /* Found. */
- XBT_DEBUG("Looked in the PATH for the binary. Found %s", binary_name);
- break;
- }
- }
- xbt_dynar_free(&path);
- if (stat(binary_name, &stat_buf)) {
- /* not found */
- char* str = bprintf("(binary '%s' not found in the PATH)", xbt_binary_name);
- e->bt_strings = { str };
- free(str);
- free(backtrace_syms);
- return;
- }
- break;
- }
- }
- } else {
- binary_name = xbt_strdup(xbt_binary_name);
- }
- int strsize = strlen(ADDR2LINE) + 25 + strlen(binary_name) + 32 * e->bt_strings.size();
- cmd = curr = xbt_new(char, strsize);
-
- curr += snprintf(curr,strsize, "%s -f -e %s ", ADDR2LINE, binary_name);
- free(binary_name);
-
- addrs = xbt_new(char *, e->bt.size());
- for (std::size_t i = 0; i < e->bt.size(); i++) {
- char *p;
- /* retrieve this address */
- XBT_DEBUG("Retrieving address number %zd from '%s'", i, backtrace_syms[i]);
- snprintf(buff, 256, "%s", strchr(backtrace_syms[i], '[') + 1);
- p = strchr(buff, ']');
- *p = '\0';
- if (strcmp(buff, "(nil)"))
- addrs[i] = xbt_strdup(buff);
- else
- addrs[i] = xbt_strdup("0x0");
- XBT_DEBUG("Set up a new address: %zd, '%s'(%p)", i, addrs[i], addrs[i]);
-
- /* Add it to the command line args */
- curr += snprintf(curr,strsize, "%s ", addrs[i]);
- }
- addr_len = strlen(addrs[0]);
-
- /* parse the output and build a new backtrace */
- e->bt_strings.resize(e->bt.size());
-
- XBT_VERB("Fire a first command: '%s'", cmd);
- pipe = popen(cmd, "r");
- if (!pipe) {
- xbt_die("Cannot fork addr2line to display the backtrace");
- }
-
- for (std::size_t i = 0; i < e->bt.size(); i++) {
- XBT_DEBUG("Looking for symbol %zd, addr = '%s'", i, addrs[i]);
- if (fgets(line_func, 1024, pipe)) {
- line_func[strlen(line_func) - 1] = '\0';
- } else {
- XBT_VERB("Cannot run fgets to look for symbol %zd, addr %s", i, addrs[i]);
- strncpy(line_func, "???",3);
- }
- if (fgets(line_pos, 1024, pipe)) {
- line_pos[strlen(line_pos) - 1] = '\0';
- } else {
- XBT_VERB("Cannot run fgets to look for symbol %zd, addr %s", i, addrs[i]);
- strncpy(line_pos, backtrace_syms[i],1024);
- }
-
- if (strcmp("??", line_func) != 0) {
- XBT_DEBUG("Found static symbol %s() at %s", line_func, line_pos);
- char* s = bprintf("** In %s() at %s", line_func, line_pos);
- e->bt_strings[i] = s;
- free(s);
- } else {
- /* Damn. The symbol is in a dynamic library. Let's get wild */
- char *maps_name;
- FILE *maps;
- char maps_buff[512];
-
- long int addr, offset = 0;
- char *p, *p2;
-
- char *subcmd;
- FILE *subpipe;
- int found = 0;
-
- /* let's look for the offset of this library in our addressing space */
- maps_name = bprintf("/proc/%d/maps", (int) getpid());
- maps = fopen(maps_name, "r");
-
- addr = strtol(addrs[i], &p, 16);
- if (*p != '\0') {
- XBT_CRITICAL("Cannot parse backtrace address '%s' (addr=%#lx)", addrs[i], addr);
- }
- XBT_DEBUG("addr=%s (as string) =%#lx (as number)", addrs[i], addr);
-
- while (!found) {
- long int first, last;
-
- if (fgets(maps_buff, 512, maps) == NULL)
- break;
- if (i == 0) {
- maps_buff[strlen(maps_buff) - 1] = '\0';
- XBT_DEBUG("map line: %s", maps_buff);
- }
- sscanf(maps_buff, "%lx", &first);
- p = strchr(maps_buff, '-') + 1;
- sscanf(p, "%lx", &last);
- if (first < addr && addr < last) {
- offset = first;
- found = 1;
- }
- if (found) {
- XBT_DEBUG("%#lx in [%#lx-%#lx]", addr, first, last);
- XBT_DEBUG("Symbol found, map lines not further displayed (even if looking for next ones)");
- }
- }
- fclose(maps);
- free(maps_name);
- free(addrs[i]);
-
- if (!found) {
- XBT_VERB("Problem while reading the maps file. Following backtrace will be mangled.");
- XBT_DEBUG("No dynamic. Static symbol: %s", backtrace_syms[i]);
- char* s = bprintf("** In ?? (%s)", backtrace_syms[i]);
- e->bt_strings[i] = s;
- free(s);
- continue;
- }
-
- /* Ok, Found the offset of the maps line containing the searched symbol.
- We now need to substract this from the address we got from backtrace.
- */
-
- addrs[i] = bprintf("0x%0*lx", addr_len - 2, addr - offset);
- XBT_DEBUG("offset=%#lx new addr=%s", offset, addrs[i]);
-
- /* Got it. We have our new address. Let's get the library path and we are set */
- p = xbt_strdup(backtrace_syms[i]);
- if (p[0] == '[') {
- /* library path not displayed in the map file either... */
- free(p);
- snprintf(line_func,3, "??");
- } else {
- p2 = strrchr(p, '(');
- if (p2)
- *p2 = '\0';
- p2 = strrchr(p, ' ');
- if (p2)
- *p2 = '\0';
-
- /* Here we go, fire an addr2line up */
- subcmd = bprintf("%s -f -e %s %s", ADDR2LINE, p, addrs[i]);
- free(p);
- XBT_VERB("Fire a new command: '%s'", subcmd);
- subpipe = popen(subcmd, "r");
- if (!subpipe) {
- 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);
- strncpy(line_func, "???",3);
- }
- if (fgets(line_pos, 1024, subpipe)) {
- line_pos[strlen(line_pos) - 1] = '\0';
- } else {
- XBT_VERB("Cannot read result of subcommand %s", subcmd);
- strncpy(line_pos, backtrace_syms[i],1024);
- }
- pclose(subpipe);
- free(subcmd);
- }
-
- /* check whether the trick worked */
- if (strcmp("??", line_func)) {
- XBT_DEBUG("Found dynamic symbol %s() at %s", line_func, line_pos);
- char* s = bprintf("** In %s() at %s", line_func, line_pos);
- e->bt_strings[i] = s;
- free(s);
- } else {
- /* damn, nothing to do here. Let's print the raw address */
- XBT_DEBUG("Dynamic symbol not found. Raw address = %s", backtrace_syms[i]);
- char* s = bprintf("** In ?? at %s", backtrace_syms[i]);
- e->bt_strings[i] = s;
- free(s);
- }
- }
- free(addrs[i]);
-
- /* Mask the bottom of the stack */
- if (!strncmp("main", line_func, strlen("main")) ||
- !strncmp("xbt_thread_context_wrapper", line_func, strlen("xbt_thread_context_wrapper"))
- || !strncmp("smx_ctx_sysv_wrapper", line_func, strlen("smx_ctx_sysv_wrapper"))) {
-
- for (std::size_t j = i + 1; j < e->bt.size(); j++)
- free(addrs[j]);
-
- if (!strncmp
- ("xbt_thread_context_wrapper", line_func, strlen("xbt_thread_context_wrapper"))) {
- e->bt_strings.push_back("** (in a separate thread)");
- } else {
- e->bt_strings.push_back("");
- }
-
- }
- }
- pclose(pipe);
- free(addrs);
- free(backtrace_syms);
- free(cmd);
-}
-
-#if 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
