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, simgrid::mc::AddressSpace::Normal, &swag, remote_swag, sizeof(swag),
  64     simgrid::mc::ProcessIndexAny);
  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, simgrid::mc::AddressSpace::Normal,
  78       &info.copy, p, sizeof(info.copy), simgrid::mc::ProcessIndexAny);
  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   MC_process_read_variable(process, "simix_global", &simix_global_p, sizeof(simix_global_p));
  99
 100   // simix_global = REMOTE(*simix_global)
 101   s_smx_global_t simix_global;
 102   MC_process_read(process, simgrid::mc::AddressSpace::Normal, &simix_global,
 103     simix_global_p, sizeof(simix_global),
 104     simgrid::mc::ProcessIndexAny);
 105
 106   MC_process_refresh_simix_process_list(
 107     process, process->smx_process_infos, simix_global.process_list);
 108   MC_process_refresh_simix_process_list(
 109     process, process->smx_old_process_infos, simix_global.process_to_destroy);
 110
 111   process->cache_flags |= MC_PROCESS_CACHE_FLAG_SIMIX_PROCESSES;
 112 }
 113
 114 /** Get the issuer of a simcall (`req->issuer`)
 115  *
 116  *  In split-process mode, it does the black magic necessary to get an address
 117  *  of a (shallow) copy of the data structure the issuer SIMIX process in the local
 118  *  address space.
 119  *
 120  *  @param process the MCed process
 121  *  @param req     the simcall (copied in the local process)
 122  */
 123 smx_process_t MC_smx_simcall_get_issuer(smx_simcall_t req)
 124 {
 125   if (mc_mode == MC_MODE_CLIENT)
 126     return req->issuer;
 127
 128   MC_process_smx_refresh(&mc_model_checker->process());
 129
 130   // This is the address of the smx_process in the MCed process:
 131   void* address = req->issuer;
 132
 133   unsigned i;
 134   mc_smx_process_info_t p;
 135
 136   // Lookup by address:
 137   xbt_dynar_foreach_ptr(mc_model_checker->process().smx_process_infos, i, p)
 138     if (p->address == address)
 139       return &p->copy;
 140   xbt_dynar_foreach_ptr(mc_model_checker->process().smx_old_process_infos, i, p)
 141     if (p->address == address)
 142       return &p->copy;
 143
 144   xbt_die("Issuer not found");
 145 }
 146
 147 smx_process_t MC_smx_resolve_process(smx_process_t process_remote_address)
 148 {
 149   if (!process_remote_address)
 150     return NULL;
 151   if (mc_mode == MC_MODE_CLIENT)
 152     return process_remote_address;
 153
 154   mc_smx_process_info_t process_info = MC_smx_resolve_process_info(process_remote_address);
 155   if (process_info)
 156     return &process_info->copy;
 157   else
 158     return NULL;
 159 }
 160
 161 mc_smx_process_info_t MC_smx_resolve_process_info(smx_process_t process_remote_address)
 162 {
 163   if (mc_mode == MC_MODE_CLIENT)
 164     xbt_die("No process_info for local process is not enabled.");
 165
 166   unsigned index;
 167   mc_smx_process_info_t process_info;
 168   xbt_dynar_foreach_ptr(mc_model_checker->process().smx_process_infos, index, process_info)
 169     if (process_info->address == process_remote_address)
 170       return process_info;
 171   xbt_dynar_foreach_ptr(mc_model_checker->process().smx_old_process_infos, index, process_info)
 172     if (process_info->address == process_remote_address)
 173       return process_info;
 174   xbt_die("Process info not found");
 175 }
 176
 177 const char* MC_smx_process_get_host_name(smx_process_t p)
 178 {
 179   if (mc_mode == MC_MODE_CLIENT)
 180     return SIMIX_host_get_name(p->smx_host);
 181
 182   mc_process_t process = &mc_model_checker->process();
 183
 184   // Currently, smx_host_t = xbt_dictelm_t.
 185   // TODO, add an static_assert on this if switching to C++
 186   // The host name is host->key and the host->key_len==strlen(host->key).
 187   s_xbt_dictelm_t host_copy;
 188   mc_smx_process_info_t info = MC_smx_process_get_info(p);
 189   if (!info->hostname) {
 190
 191     // Read the hostname from the MCed process:
 192     MC_process_read_simple(process, &host_copy, p->smx_host, sizeof(host_copy));
 193     int len = host_copy.key_len + 1;
 194     char hostname[len];
 195     MC_process_read_simple(process, hostname, host_copy.key, len);
 196     info->hostname = mc_model_checker->get_host_name(hostname);
 197   }
 198   return info->hostname;
 199 }
 200
 201 const char* MC_smx_process_get_name(smx_process_t p)
 202 {
 203   mc_process_t process = &mc_model_checker->process();
 204   if (mc_mode == MC_MODE_CLIENT)
 205     return p->name;
 206   if (!p->name)
 207     return NULL;
 208
 209   mc_smx_process_info_t info = MC_smx_process_get_info(p);
 210   if (!info->name) {
 211     info->name = MC_process_read_string(process, p->name);
 212   }
 213   return info->name;
 214 }
 215
 216 int MC_smpi_process_count(void)
 217 {
 218   if (mc_mode == MC_MODE_CLIENT)
 219     return smpi_process_count();
 220   else {
 221     int res;
 222     MC_process_read_variable(&mc_model_checker->process(), "process_count",
 223       &res, sizeof(res));
 224     return res;
 225   }
 226 }
 227
 228 unsigned long MC_smx_get_maxpid(void)
 229 {
 230   unsigned long maxpid;
 231   MC_process_read_variable(&mc_model_checker->process(), "simix_process_maxpid",
 232     &maxpid, sizeof(maxpid));
 233   return maxpid;
 234 }
 235
 236 }