1 /* Copyright (c) 2015-2020. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "simgrid/s4u/Host.hpp"
8 #include "src/mc/ModelChecker.hpp"
9 #include "src/mc/mc_smx.hpp"
11 using simgrid::mc::remote;
13 /** HACK, Statically "upcast" a s_smx_actor_t into a ActorInformation
15 * This gets 'actorInfo' from '&actorInfo->copy'. It upcasts in the
16 * sense that we could achieve the same thing by having ActorInformation
17 * inherit from s_smx_actor_t but we don't really want to do that.
19 static inline simgrid::mc::ActorInformation* actor_info_cast(smx_actor_t actor)
21 simgrid::mc::ActorInformation temp;
22 std::size_t offset = (char*)temp.copy.get_buffer() - (char*)&temp;
24 auto* process_info = reinterpret_cast<simgrid::mc::ActorInformation*>((char*)actor - offset);
28 /** Load the remote list of processes into a vector
30 * @param process MCed process
31 * @param target Local vector (to be filled with copies of `s_smx_actor_t`)
32 * @param remote_dynar Address of the process dynar in the remote list
34 static void MC_process_refresh_simix_actor_dynar(const simgrid::mc::RemoteSimulation* process,
35 std::vector<simgrid::mc::ActorInformation>& target,
36 simgrid::mc::RemotePtr<s_xbt_dynar_t> remote_dynar)
41 process->read_bytes(&dynar, sizeof(dynar), remote_dynar);
43 auto* data = static_cast<smx_actor_t*>(::operator new(dynar.elmsize * dynar.used));
44 process->read_bytes(data, dynar.elmsize * dynar.used, simgrid::mc::RemotePtr<void>(dynar.data));
46 // Load each element of the vector from the MCed process:
47 for (unsigned int i = 0; i < dynar.used; ++i) {
48 simgrid::mc::ActorInformation info;
50 info.address = simgrid::mc::RemotePtr<simgrid::kernel::actor::ActorImpl>(data[i]);
51 info.hostname = nullptr;
52 process->read_bytes(&info.copy, sizeof(info.copy), remote(data[i]));
53 target.push_back(std::move(info));
55 ::operator delete(data);
60 void RemoteSimulation::refresh_simix()
62 if (this->cache_flags_ & RemoteSimulation::cache_simix_processes)
65 // TODO, avoid to reload `&simix_global`, `simix_global`, `*simix_global`
67 static_assert(std::is_same<
68 std::unique_ptr<simgrid::simix::Global>,
69 decltype(simix_global)
70 >::value, "Unexpected type for simix_global");
71 static_assert(sizeof(simix_global) == sizeof(simgrid::simix::Global*),
72 "Bad size for simix_global");
74 RemotePtr<simgrid::simix::Global> simix_global_p{this->read_variable<simgrid::simix::Global*>("simix_global")};
76 // simix_global = REMOTE(*simix_global)
77 Remote<simgrid::simix::Global> simix_global =
78 this->read<simgrid::simix::Global>(simix_global_p);
80 MC_process_refresh_simix_actor_dynar(this, this->smx_actors_infos, remote(simix_global.get_buffer()->actors_vector));
81 MC_process_refresh_simix_actor_dynar(this, this->smx_dead_actors_infos,
82 remote(simix_global.get_buffer()->dead_actors_vector));
84 this->cache_flags_ |= RemoteSimulation::cache_simix_processes;
90 /** Get the issuer of a simcall (`req->issuer`)
92 * In split-process mode, it does the black magic necessary to get an address
93 * of a (shallow) copy of the data structure the issuer SIMIX actor in the local
96 * @param process the MCed process
97 * @param req the simcall (copied in the local process)
99 smx_actor_t MC_smx_simcall_get_issuer(s_smx_simcall const* req)
101 xbt_assert(mc_model_checker != nullptr);
103 // This is the address of the smx_actor in the MCed process:
104 auto address = simgrid::mc::remote(req->issuer_);
106 // Lookup by address:
107 for (auto& actor : mc_model_checker->get_remote_simulation().actors())
108 if (actor.address == address)
109 return actor.copy.get_buffer();
110 for (auto& actor : mc_model_checker->get_remote_simulation().dead_actors())
111 if (actor.address == address)
112 return actor.copy.get_buffer();
114 xbt_die("Issuer not found");
117 const char* MC_smx_actor_get_host_name(smx_actor_t actor)
119 if (mc_model_checker == nullptr)
120 return actor->get_host()->get_cname();
122 const simgrid::mc::RemoteSimulation* process = &mc_model_checker->get_remote_simulation();
124 // Read the simgrid::xbt::string in the MCed process:
125 simgrid::mc::ActorInformation* info = actor_info_cast(actor);
126 auto remote_string_address =
127 remote(reinterpret_cast<const simgrid::xbt::string_data*>(&actor->get_host()->get_name()));
128 simgrid::xbt::string_data remote_string = process->read(remote_string_address);
129 char hostname[remote_string.len];
130 process->read_bytes(hostname, remote_string.len + 1, remote(remote_string.data));
131 info->hostname = mc_model_checker->get_host_name(hostname).c_str();
132 return info->hostname;
135 const char* MC_smx_actor_get_name(smx_actor_t actor)
137 const simgrid::mc::RemoteSimulation* process = &mc_model_checker->get_remote_simulation();
138 if (mc_model_checker == nullptr)
139 return actor->get_cname();
141 simgrid::mc::ActorInformation* info = actor_info_cast(actor);
142 if (info->name.empty()) {
143 simgrid::xbt::string_data string_data = simgrid::xbt::string::to_string_data(actor->name_);
144 info->name = process->read_string(remote(string_data.data), string_data.len);
146 return info->name.c_str();
149 unsigned long MC_smx_get_maxpid()
151 unsigned long maxpid;
152 const char* name = "simgrid::kernel::actor::maxpid";
153 if (mc_model_checker->get_remote_simulation().find_variable(name) == nullptr)
154 name = "maxpid"; // We seem to miss the namespaces when compiling with GCC
155 mc_model_checker->get_remote_simulation().read_variable(name, &maxpid, sizeof(maxpid));