1 /* Copyright (c) 2015. The SimGrid Team.
2 * All rights reserved. */
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. */
16 #include "src/simix/smx_private.h"
18 #include "src/mc/mc_smx.h"
19 #include "src/mc/ModelChecker.hpp"
21 using simgrid::mc::remote;
26 bool is_in_vector(smx_process_t p, std::vector<simgrid::mc::SimixProcessInformation>& ps)
28 return (uintptr_t) p >= (uintptr_t) &ps[0]
29 && (uintptr_t) p < (uintptr_t) &ps[ps.size()];
33 simgrid::mc::SimixProcessInformation* MC_smx_process_get_info(smx_process_t p)
35 assert(is_in_vector(p, mc_model_checker->process().smx_process_infos)
36 || is_in_vector(p, mc_model_checker->process().smx_old_process_infos));
37 simgrid::mc::SimixProcessInformation* process_info =
38 (simgrid::mc::SimixProcessInformation*)
39 ((char*) p - offsetof(simgrid::mc::SimixProcessInformation, copy));
43 /** Load the remote swag of processes into a vector
45 * @param process MCed process
46 * @param target Local vector (to be filled with copies of `s_smx_process_t`)
47 * @param remote_swag Address of the process SWAG in the remote list
49 static void MC_process_refresh_simix_process_list(
50 simgrid::mc::Process* process,
51 std::vector<simgrid::mc::SimixProcessInformation>& target, xbt_swag_t remote_swag)
55 // swag = REMOTE(*simix_global->process_list)
57 process->read_bytes(&swag, sizeof(swag), remote(remote_swag));
59 // Load each element of the vector from the MCed process:
61 for (smx_process_t p = (smx_process_t) swag.head; p; ++i) {
63 simgrid::mc::SimixProcessInformation info;
65 info.hostname = nullptr;
66 process->read_bytes(&info.copy, sizeof(info.copy), remote(p));
67 target.push_back(std::move(info));
69 // Lookup next process address:
70 p = (smx_process_t) xbt_swag_getNext(&info.copy, swag.offset);
72 assert(i == swag.count);
78 void Process::refresh_simix()
80 if (this->cache_flags_ & Process::cache_simix_processes)
83 // TODO, avoid to reload `&simix_global`, `simix_global`, `*simix_global`
85 // simix_global_p = REMOTE(simix_global);
86 smx_global_t simix_global_p;
87 this->read_variable("simix_global", &simix_global_p, sizeof(simix_global_p));
89 // simix_global = REMOTE(*simix_global)
90 s_smx_global_t simix_global;
91 this->read_bytes(&simix_global, sizeof(simix_global),
92 remote(simix_global_p));
94 MC_process_refresh_simix_process_list(
95 this, this->smx_process_infos, simix_global.process_list);
96 MC_process_refresh_simix_process_list(
97 this, this->smx_old_process_infos, simix_global.process_to_destroy);
99 this->cache_flags_ |= Process::cache_simix_processes;
105 /** Get the issuer of a simcall (`req->issuer`)
107 * In split-process mode, it does the black magic necessary to get an address
108 * of a (shallow) copy of the data structure the issuer SIMIX process in the local
111 * @param process the MCed process
112 * @param req the simcall (copied in the local process)
114 smx_process_t MC_smx_simcall_get_issuer(s_smx_simcall_t const* req)
116 if (mc_mode == MC_MODE_CLIENT)
119 // This is the address of the smx_process in the MCed process:
120 auto address = simgrid::mc::remote(req->issuer);
122 // Lookup by address:
123 for (auto& p : mc_model_checker->process().simix_processes())
124 if (p.address == address)
126 for (auto& p : mc_model_checker->process().old_simix_processes())
127 if (p.address == address)
130 xbt_die("Issuer not found");
133 smx_process_t MC_smx_resolve_process(
134 simgrid::mc::RemotePtr<s_smx_process_t> process_remote_address)
136 if (!process_remote_address)
138 if (mc_mode == MC_MODE_CLIENT)
139 return process_remote_address.local();
141 simgrid::mc::SimixProcessInformation* process_info =
142 MC_smx_resolve_process_info(process_remote_address);
144 return &process_info->copy;
149 simgrid::mc::SimixProcessInformation* MC_smx_resolve_process_info(
150 simgrid::mc::RemotePtr<s_smx_process_t> process_remote_address)
152 if (mc_mode == MC_MODE_CLIENT)
153 xbt_die("No process_info for local process is not enabled.");
154 for (auto& process_info : mc_model_checker->process().smx_process_infos)
155 if (process_info.address == process_remote_address)
156 return &process_info;
157 for (auto& process_info : mc_model_checker->process().smx_old_process_infos)
158 if (process_info.address == process_remote_address)
159 return &process_info;
160 xbt_die("Process info not found");
163 const char* MC_smx_process_get_host_name(smx_process_t p)
165 if (mc_mode == MC_MODE_CLIENT)
166 return sg_host_get_name(p->host);
168 simgrid::mc::Process* process = &mc_model_checker->process();
170 /* HACK, Horrible hack to find the offset of the id in the simgrid::s4u::Host.
172 Offsetof is not supported for non-POD types but this should
173 work in pratice for the targets currently supported by the MC
174 as long as we do not add funny features to the Host class
175 (such as virtual base).
177 We are using a (C++11) unrestricted union in order to avoid
178 any construction/destruction of the simgrid::s4u::Host.
181 simgrid::s4u::Host host;
186 const size_t offset = (char*) &foo.host.name() - (char*) &foo.host;
188 // Read the simgrid::xbt::string in the MCed process:
189 simgrid::mc::SimixProcessInformation* info = MC_smx_process_get_info(p);
190 simgrid::xbt::string_data remote_string;
191 auto remote_string_address = remote(
192 (simgrid::xbt::string_data*) ((char*) p->host + offset));
193 process->read_bytes(&remote_string, sizeof(remote_string), remote_string_address);
194 char hostname[remote_string.len];
195 process->read_bytes(hostname, remote_string.len + 1, remote(remote_string.data));
196 info->hostname = mc_model_checker->get_host_name(hostname);
197 return info->hostname;
200 const char* MC_smx_process_get_name(smx_process_t p)
202 simgrid::mc::Process* process = &mc_model_checker->process();
203 if (mc_mode == MC_MODE_CLIENT)
208 simgrid::mc::SimixProcessInformation* info = MC_smx_process_get_info(p);
209 if (info->name.empty())
210 info->name = process->read_string(p->name);
211 return info->name.c_str();
215 int MC_smpi_process_count(void)
217 if (mc_mode == MC_MODE_CLIENT)
218 return smpi_process_count();
220 mc_model_checker->process().read_variable("process_count",
226 unsigned long MC_smx_get_maxpid(void)
228 unsigned long maxpid;
229 mc_model_checker->process().read_variable("simix_process_maxpid",
230 &maxpid, sizeof(maxpid));