src/mc/mc_smx.cpp

   1 /* Copyright (c) 2015. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include <assert.h>
   8
   9 #include <xbt/log.h>
  10
  11 #include "simix/smx_private.h"
  12
  13 #include "mc_smx.h"
  14 #include "ModelChecker.hpp"
  15
  16 using simgrid::mc::remote;
  17
  18 extern "C" {
  19
  20 static
  21 void MC_smx_process_info_clear(mc_smx_process_info_t p)
  22 {
  23   p->hostname = NULL;
  24   free(p->name);
  25   p->name = NULL;
  26 }
  27
  28 xbt_dynar_t MC_smx_process_info_list_new(void)
  29 {
  30   return xbt_dynar_new(
  31     sizeof(s_mc_smx_process_info_t),
  32     ( void_f_pvoid_t) &MC_smx_process_info_clear);
  33 }
  34
  35 static inline
  36 bool is_in_dynar(smx_process_t p, xbt_dynar_t dynar)
  37 {
  38   return (uintptr_t) p >= (uintptr_t) dynar->data
  39     && (uintptr_t) p < ((uintptr_t) dynar->data + dynar->used * dynar->elmsize);
  40 }
  41
  42 static inline
  43 mc_smx_process_info_t MC_smx_process_get_info(smx_process_t p)
  44 {
  45   assert(is_in_dynar(p, mc_model_checker->process().smx_process_infos)
  46     || is_in_dynar(p, mc_model_checker->process().smx_old_process_infos));
  47   mc_smx_process_info_t process_info =
  48     (mc_smx_process_info_t)
  49       ((char*) p - offsetof(s_mc_smx_process_info_t, copy));
  50   return process_info;
  51 }
  52
  53 /** Load the remote swag of processes into a dynar
  54  *
  55  *  @param process     MCed process
  56  *  @param target      Local dynar (to be filled with copies of `s_smx_process_t`)
  57  *  @param remote_swag Address of the process SWAG in the remote list
  58  */
  59 static void MC_process_refresh_simix_process_list(
  60   mc_process_t process,
  61   xbt_dynar_t target, xbt_swag_t remote_swag)
  62 {
  63   // swag = REMOTE(*simix_global->process_list)
  64   s_xbt_swag_t swag;
  65   process->read_bytes(&swag, sizeof(swag), remote(remote_swag));
  66
  67   smx_process_t p;
  68   xbt_dynar_reset(target);
  69
  70   // Load each element of the dynar from the MCed process:
  71   int i = 0;
  72   for (p = (smx_process_t) swag.head; p; ++i) {
  73
  74     s_mc_smx_process_info_t info;
  75     info.address = p;
  76     info.name = NULL;
  77     info.hostname = NULL;
  78     process->read_bytes(&info.copy, sizeof(info.copy), remote(p));
  79     xbt_dynar_push(target, &info);
  80
  81     // Lookup next process address:
  82     p = (smx_process_t) xbt_swag_getNext(&info.copy, swag.offset);
  83   }
  84   assert(i == swag.count);
  85 }
  86
  87 void MC_process_smx_refresh(mc_process_t process)
  88 {
  89   xbt_assert(mc_mode == MC_MODE_SERVER);
  90   xbt_assert(!process->is_self());
  91   if (process->cache_flags & MC_PROCESS_CACHE_FLAG_SIMIX_PROCESSES)
  92     return;
  93
  94   // TODO, avoid to reload `&simix_global`, `simix_global`, `*simix_global`
  95
  96   // simix_global_p = REMOTE(simix_global);
  97   smx_global_t simix_global_p;
  98   process->read_variable("simix_global", &simix_global_p, sizeof(simix_global_p));
  99
 100   // simix_global = REMOTE(*simix_global)
 101   s_smx_global_t simix_global;
 102   process->read_bytes(&simix_global, sizeof(simix_global),
 103     remote(simix_global_p));
 104
 105   MC_process_refresh_simix_process_list(
 106     process, process->smx_process_infos, simix_global.process_list);
 107   MC_process_refresh_simix_process_list(
 108     process, process->smx_old_process_infos, simix_global.process_to_destroy);
 109
 110   process->cache_flags |= MC_PROCESS_CACHE_FLAG_SIMIX_PROCESSES;
 111 }
 112
 113 /** Get the issuer of a simcall (`req->issuer`)
 114  *
 115  *  In split-process mode, it does the black magic necessary to get an address
 116  *  of a (shallow) copy of the data structure the issuer SIMIX process in the local
 117  *  address space.
 118  *
 119  *  @param process the MCed process
 120  *  @param req     the simcall (copied in the local process)
 121  */
 122 smx_process_t MC_smx_simcall_get_issuer(smx_simcall_t req)
 123 {
 124   if (mc_mode == MC_MODE_CLIENT)
 125     return req->issuer;
 126
 127   MC_process_smx_refresh(&mc_model_checker->process());
 128
 129   // This is the address of the smx_process in the MCed process:
 130   void* address = req->issuer;
 131
 132   unsigned i;
 133   mc_smx_process_info_t p;
 134
 135   // Lookup by address:
 136   xbt_dynar_foreach_ptr(mc_model_checker->process().smx_process_infos, i, p)
 137     if (p->address == address)
 138       return &p->copy;
 139   xbt_dynar_foreach_ptr(mc_model_checker->process().smx_old_process_infos, i, p)
 140     if (p->address == address)
 141       return &p->copy;
 142
 143   xbt_die("Issuer not found");
 144 }
 145
 146 smx_process_t MC_smx_resolve_process(smx_process_t process_remote_address)
 147 {
 148   if (!process_remote_address)
 149     return NULL;
 150   if (mc_mode == MC_MODE_CLIENT)
 151     return process_remote_address;
 152
 153   mc_smx_process_info_t process_info = MC_smx_resolve_process_info(process_remote_address);
 154   if (process_info)
 155     return &process_info->copy;
 156   else
 157     return NULL;
 158 }
 159
 160 mc_smx_process_info_t MC_smx_resolve_process_info(smx_process_t process_remote_address)
 161 {
 162   if (mc_mode == MC_MODE_CLIENT)
 163     xbt_die("No process_info for local process is not enabled.");
 164
 165   unsigned index;
 166   mc_smx_process_info_t process_info;
 167   xbt_dynar_foreach_ptr(mc_model_checker->process().smx_process_infos, index, process_info)
 168     if (process_info->address == process_remote_address)
 169       return process_info;
 170   xbt_dynar_foreach_ptr(mc_model_checker->process().smx_old_process_infos, index, process_info)
 171     if (process_info->address == process_remote_address)
 172       return process_info;
 173   xbt_die("Process info not found");
 174 }
 175
 176 const char* MC_smx_process_get_host_name(smx_process_t p)
 177 {
 178   if (mc_mode == MC_MODE_CLIENT)
 179     return SIMIX_host_get_name(p->smx_host);
 180
 181   mc_process_t process = &mc_model_checker->process();
 182
 183   // Currently, smx_host_t = xbt_dictelm_t.
 184   // TODO, add an static_assert on this if switching to C++
 185   // The host name is host->key and the host->key_len==strlen(host->key).
 186   s_xbt_dictelm_t host_copy;
 187   mc_smx_process_info_t info = MC_smx_process_get_info(p);
 188   if (!info->hostname) {
 189
 190     // Read the hostname from the MCed process:
 191     process->read_bytes(&host_copy, sizeof(host_copy), remote(p->smx_host));
 192     int len = host_copy.key_len + 1;
 193     char hostname[len];
 194     process->read_bytes(hostname, len, remote(host_copy.key));
 195     info->hostname = mc_model_checker->get_host_name(hostname);
 196   }
 197   return info->hostname;
 198 }
 199
 200 const char* MC_smx_process_get_name(smx_process_t p)
 201 {
 202   mc_process_t process = &mc_model_checker->process();
 203   if (mc_mode == MC_MODE_CLIENT)
 204     return p->name;
 205   if (!p->name)
 206     return NULL;
 207
 208   mc_smx_process_info_t info = MC_smx_process_get_info(p);
 209   if (!info->name) {
 210     info->name = process->read_string(p->name);
 211   }
 212   return info->name;
 213 }
 214
 215 int MC_smpi_process_count(void)
 216 {
 217   if (mc_mode == MC_MODE_CLIENT)
 218     return smpi_process_count();
 219   else {
 220     int res;
 221     mc_model_checker->process().read_variable("process_count",
 222       &res, sizeof(res));
 223     return res;
 224   }
 225 }
 226
 227 unsigned long MC_smx_get_maxpid(void)
 228 {
 229   unsigned long maxpid;
 230   mc_model_checker->process().read_variable("simix_process_maxpid",
 231     &maxpid, sizeof(maxpid));
 232   return maxpid;
 233 }
 234
 235 }