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