X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/07483e97b12350d1d293f19689575f0fbdcf0246..ea74f5d95928a521a588737e81f1de94eef25d19:/src/mc/mc_smx.cpp diff --git a/src/mc/mc_smx.cpp b/src/mc/mc_smx.cpp index 86303fc333..82d03d4996 100644 --- a/src/mc/mc_smx.cpp +++ b/src/mc/mc_smx.cpp @@ -1,203 +1,75 @@ -/* Copyright (c) 2015-2017. The SimGrid Team. All rights reserved. */ +/* Copyright (c) 2015-2022. The SimGrid Team. All rights reserved. */ /* This program is free software; you can redistribute it and/or modify it * under the terms of the license (GNU LGPL) which comes with this package. */ -#include -#include -#include +#include "simgrid/s4u/Host.hpp" -#include -#include -#include -#include - -#include -#include -#include - -#include - -#include "src/simix/smx_private.h" -#include "src/mc/mc_smx.h" #include "src/mc/ModelChecker.hpp" +#include "src/mc/remote/RemoteProcess.hpp" using simgrid::mc::remote; - -/** HACK, Statically "upcast" a s_smx_actor_t into a ActorInformation +/** @file + * @brief (Cross-process, MCer/MCed) Access to SMX structures + * + * We copy some C data structure from the MCed process in the MCer process. + * This is implemented by: + * + * - `model_checker->process.smx_process_infos` + * (copy of `EngineImpl::actor_list_`); * - * This gets 'actorInfo' from '&actorInfo->copy'. It upcasts in the - * sense that we could achieve the same thing by having ActorInformation - * inherit from s_smx_actor_t but we don't really want to do that. + * - `model_checker->process.smx_old_process_infos` + * (copy of `EngineImpl::actors_to_destroy_`); + * + * - `model_checker->hostnames`. + * + * The process lists are currently refreshed each time MCed code is executed. + * We don't try to give a persistent MCer address for a given MCed process. + * For this reason, a MCer simgrid::mc::Process* is currently not reusable after + * MCed code. */ -static inline simgrid::mc::ActorInformation* actor_info_cast(smx_actor_t actor) -{ - simgrid::mc::ActorInformation temp; - std::size_t offset = (char*) temp.copy.getBuffer() - (char*)&temp; - simgrid::mc::ActorInformation* process_info = (simgrid::mc::ActorInformation*)((char*)actor - offset); - return process_info; -} - -/** Load the remote swag of processes into a vector +/** Load the remote list of processes into a vector * - * @param process MCed process - * @param target Local vector (to be filled with copies of `s_smx_actor_t`) - * @param remote_swag Address of the process SWAG in the remote list + * @param process MCed process + * @param target Local vector (to be filled with copies of `s_smx_actor_t`) + * @param remote_dynar Address of the process dynar in the remote list */ -static void MC_process_refresh_simix_process_list(simgrid::mc::Process* process, - std::vector& target, - simgrid::mc::RemotePtr remote_swag) +static void MC_process_refresh_simix_actor_dynar(const simgrid::mc::RemoteProcess* process, + std::vector& target, + simgrid::mc::RemotePtr remote_dynar) { target.clear(); - // swag = REMOTE(*simix_global->process_list) - s_xbt_swag_t swag; - process->read_bytes(&swag, sizeof(swag), remote_swag); + s_xbt_dynar_t dynar; + process->read_bytes(&dynar, sizeof(dynar), remote_dynar); - // Load each element of the vector from the MCed process: - int i = 0; - for (smx_actor_t p = (smx_actor_t) swag.head; p; ++i) { + auto* data = static_cast(::operator new(dynar.elmsize * dynar.used)); + process->read_bytes(data, dynar.elmsize * dynar.used, simgrid::mc::RemotePtr(dynar.data)); + // Load each element of the vector from the MCed process: + for (unsigned int i = 0; i < dynar.used; ++i) { simgrid::mc::ActorInformation info; - info.address = p; - info.hostname = nullptr; - process->read_bytes(&info.copy, sizeof(info.copy), remote(p)); - target.push_back(std::move(info)); - // Lookup next process address: - p = (smx_actor_t) xbt_swag_getNext(&info.copy, swag.offset); + info.address = simgrid::mc::RemotePtr(data[i]); + process->read_bytes(&info.copy, sizeof(info.copy), remote(data[i])); + target.push_back(std::move(info)); } - assert(i == swag.count); + ::operator delete(data); } - namespace simgrid { namespace mc { -void Process::refresh_simix() +void RemoteProcess::refresh_simix() { - if (this->cache_flags_ & Process::cache_simix_processes) + if (this->cache_flags_ & RemoteProcess::cache_simix_processes) return; - // TODO, avoid to reload `&simix_global`, `simix_global`, `*simix_global` - - static_assert(std::is_same< - std::unique_ptr, - decltype(simix_global) - >::value, "Unexpected type for simix_global"); - static_assert(sizeof(simix_global) == sizeof(simgrid::simix::Global*), - "Bad size for simix_global"); - - // simix_global_p = REMOTE(simix_global.get()); - RemotePtr simix_global_p = - this->read_variable("simix_global"); - - // simix_global = REMOTE(*simix_global) - Remote simix_global = - this->read(simix_global_p); - - MC_process_refresh_simix_process_list(this, this->smx_actors_infos, remote(simix_global.getBuffer()->process_list)); - MC_process_refresh_simix_process_list(this, this->smx_dead_actors_infos, - remote(simix_global.getBuffer()->process_to_destroy)); - - this->cache_flags_ |= Process::cache_simix_processes; -} - -} -} - -/** Get the issuer of a simcall (`req->issuer`) - * - * In split-process mode, it does the black magic necessary to get an address - * of a (shallow) copy of the data structure the issuer SIMIX actor in the local - * address space. - * - * @param process the MCed process - * @param req the simcall (copied in the local process) - */ -smx_actor_t MC_smx_simcall_get_issuer(s_smx_simcall_t const* req) -{ - xbt_assert(mc_model_checker != nullptr); - - // This is the address of the smx_actor in the MCed process: - auto address = simgrid::mc::remote(req->issuer); - - // Lookup by address: - for (auto& actor : mc_model_checker->process().actors()) - if (actor.address == address) - return actor.copy.getBuffer(); - for (auto& actor : mc_model_checker->process().dead_actors()) - if (actor.address == address) - return actor.copy.getBuffer(); - - xbt_die("Issuer not found"); -} - -const char* MC_smx_actor_get_host_name(smx_actor_t actor) -{ - if (mc_model_checker == nullptr) - return actor->host->cname(); - - simgrid::mc::Process* process = &mc_model_checker->process(); - - /* HACK, Horrible hack to find the offset of the id in the simgrid::s4u::Host. - - Offsetof is not supported for non-POD types but this should - work in practice for the targets currently supported by the MC - as long as we do not add funny features to the Host class - (such as virtual base). - - We are using a (C++11) unrestricted union in order to avoid - any construction/destruction of the simgrid::s4u::Host. - */ - union fake_host { - simgrid::s4u::Host host; - fake_host() {} - ~fake_host() {} - }; - fake_host foo; - const size_t offset = (char*) &foo.host.name() - (char*) &foo.host; - - // Read the simgrid::xbt::string in the MCed process: - simgrid::mc::ActorInformation* info = actor_info_cast(actor); - auto remote_string_address = remote((simgrid::xbt::string_data*)((char*)actor->host + offset)); - simgrid::xbt::string_data remote_string = process->read(remote_string_address); - char hostname[remote_string.len]; - process->read_bytes(hostname, remote_string.len + 1, remote(remote_string.data)); - info->hostname = mc_model_checker->get_host_name(hostname).c_str(); - return info->hostname; -} - -const char* MC_smx_actor_get_name(smx_actor_t actor) -{ - simgrid::mc::Process* process = &mc_model_checker->process(); - if (mc_model_checker == nullptr) - return actor->name.c_str(); + MC_process_refresh_simix_actor_dynar(this, this->smx_actors_infos, actors_addr_); + MC_process_refresh_simix_actor_dynar(this, this->smx_dead_actors_infos, dead_actors_addr_); - simgrid::mc::ActorInformation* info = actor_info_cast(actor); - if (info->name.empty()) { - simgrid::xbt::string_data string_data = (simgrid::xbt::string_data&)actor->name; - info->name = process->read_string(remote(string_data.data), string_data.len); - } - return info->name.c_str(); + this->cache_flags_ |= RemoteProcess::cache_simix_processes; } -#if HAVE_SMPI -int MC_smpi_process_count(void) -{ - if (mc_model_checker == nullptr) - return smpi_process_count(); - int res; - mc_model_checker->process().read_variable("process_count", - &res, sizeof(res)); - return res; } -#endif - -unsigned long MC_smx_get_maxpid(void) -{ - unsigned long maxpid; - mc_model_checker->process().read_variable("simix_process_maxpid", - &maxpid, sizeof(maxpid)); - return maxpid; }