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 xbt_assert(mc_mode == MC_MODE_SERVER);
118 // This is the address of the smx_process in the MCed process:
119 auto address = simgrid::mc::remote(req->issuer);
121 // Lookup by address:
122 for (auto& p : mc_model_checker->process().simix_processes())
123 if (p.address == address)
125 for (auto& p : mc_model_checker->process().old_simix_processes())
126 if (p.address == address)
129 xbt_die("Issuer not found");
132 smx_process_t MC_smx_resolve_process(
133 simgrid::mc::RemotePtr<s_smx_process_t> process_remote_address)
135 xbt_assert(mc_mode == MC_MODE_SERVER);
137 if (!process_remote_address)
140 simgrid::mc::SimixProcessInformation* process_info =
141 MC_smx_resolve_process_info(process_remote_address);
143 return &process_info->copy;
148 simgrid::mc::SimixProcessInformation* MC_smx_resolve_process_info(
149 simgrid::mc::RemotePtr<s_smx_process_t> process_remote_address)
151 xbt_assert(mc_mode == MC_MODE_SERVER);
153 for (auto& process_info : mc_model_checker->process().smx_process_infos)
154 if (process_info.address == process_remote_address)
155 return &process_info;
156 for (auto& process_info : mc_model_checker->process().smx_old_process_infos)
157 if (process_info.address == process_remote_address)
158 return &process_info;
159 xbt_die("Process info not found");
162 const char* MC_smx_process_get_host_name(smx_process_t p)
164 if (mc_mode == MC_MODE_CLIENT)
165 return sg_host_get_name(p->host);
167 simgrid::mc::Process* process = &mc_model_checker->process();
169 /* HACK, Horrible hack to find the offset of the id in the simgrid::s4u::Host.
171 Offsetof is not supported for non-POD types but this should
172 work in pratice for the targets currently supported by the MC
173 as long as we do not add funny features to the Host class
174 (such as virtual base).
176 We are using a (C++11) unrestricted union in order to avoid
177 any construction/destruction of the simgrid::s4u::Host.
180 simgrid::s4u::Host host;
185 const size_t offset = (char*) &foo.host.name() - (char*) &foo.host;
187 // Read the simgrid::xbt::string in the MCed process:
188 simgrid::mc::SimixProcessInformation* info = MC_smx_process_get_info(p);
189 simgrid::xbt::string_data remote_string;
190 auto remote_string_address = remote(
191 (simgrid::xbt::string_data*) ((char*) p->host + offset));
192 process->read_bytes(&remote_string, sizeof(remote_string), remote_string_address);
193 char hostname[remote_string.len];
194 process->read_bytes(hostname, remote_string.len + 1, remote(remote_string.data));
195 info->hostname = mc_model_checker->get_host_name(hostname);
196 return info->hostname;
199 const char* MC_smx_process_get_name(smx_process_t p)
201 simgrid::mc::Process* process = &mc_model_checker->process();
202 if (mc_mode == MC_MODE_CLIENT)
207 simgrid::mc::SimixProcessInformation* info = MC_smx_process_get_info(p);
208 if (info->name.empty())
209 info->name = process->read_string(p->name);
210 return info->name.c_str();
214 int MC_smpi_process_count(void)
216 if (mc_mode == MC_MODE_CLIENT)
217 return smpi_process_count();
219 mc_model_checker->process().read_variable("process_count",
225 unsigned long MC_smx_get_maxpid(void)
227 unsigned long maxpid;
228 mc_model_checker->process().read_variable("simix_process_maxpid",
229 &maxpid, sizeof(maxpid));