-/* Copyright (c) 2015. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2015-2021. 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 <cassert>
-#include <cstdlib>
+#include "simgrid/s4u/Host.hpp"
-#include <vector>
-
-#include <xbt/log.h>
-#include <xbt/str.h>
-#include <xbt/swag.h>
-
-#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;
+/** @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 `simix_global->process_list`);
+ *
+ * - `model_checker->process.smx_old_process_infos`
+ * (copy of `simix_global->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.
+ */
-extern "C" {
-
-static inline
-bool is_in_vector(smx_process_t p, std::vector<simgrid::mc::SimixProcessInformation>& ps)
-{
- return (uintptr_t) p >= (uintptr_t) &ps[0]
- && (uintptr_t) p < (uintptr_t) &ps[ps.size()];
-}
-
-static inline
-simgrid::mc::SimixProcessInformation* MC_smx_process_get_info(smx_process_t p)
-{
- assert(is_in_vector(p, mc_model_checker->process().smx_process_infos)
- || is_in_vector(p, mc_model_checker->process().smx_old_process_infos));
- simgrid::mc::SimixProcessInformation* process_info =
- (simgrid::mc::SimixProcessInformation*)
- ((char*) p - offsetof(simgrid::mc::SimixProcessInformation, copy));
- 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_process_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<simgrid::mc::SimixProcessInformation>& target, xbt_swag_t remote_swag)
+static void MC_process_refresh_simix_actor_dynar(const simgrid::mc::RemoteProcess* process,
+ std::vector<simgrid::mc::ActorInformation>& target,
+ simgrid::mc::RemotePtr<s_xbt_dynar_t> remote_dynar)
{
target.clear();
- // swag = REMOTE(*simix_global->process_list)
- s_xbt_swag_t swag;
- process->read_bytes(&swag, sizeof(swag), remote(remote_swag));
+ s_xbt_dynar_t dynar;
+ process->read_bytes(&dynar, sizeof(dynar), remote_dynar);
+
+ auto* data = static_cast<smx_actor_t*>(::operator new(dynar.elmsize * dynar.used));
+ process->read_bytes(data, dynar.elmsize * dynar.used, simgrid::mc::RemotePtr<void>(dynar.data));
// Load each element of the vector from the MCed process:
- int i = 0;
- for (smx_process_t p = (smx_process_t) swag.head; p; ++i) {
+ for (unsigned int i = 0; i < dynar.used; ++i) {
+ simgrid::mc::ActorInformation info;
- simgrid::mc::SimixProcessInformation info;
- info.address = p;
+ info.address = simgrid::mc::RemotePtr<simgrid::kernel::actor::ActorImpl>(data[i]);
info.hostname = nullptr;
- process->read_bytes(&info.copy, sizeof(info.copy), remote(p));
+ process->read_bytes(&info.copy, sizeof(info.copy), remote(data[i]));
target.push_back(std::move(info));
-
- // Lookup next process address:
- p = (smx_process_t) xbt_swag_getNext(&info.copy, swag.offset);
}
- 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`
-
- // simix_global_p = REMOTE(simix_global);
- smx_global_t simix_global_p;
- this->read_variable("simix_global", &simix_global_p, sizeof(simix_global_p));
-
- // simix_global = REMOTE(*simix_global)
- s_smx_global_t simix_global;
- this->read_bytes(&simix_global, sizeof(simix_global),
- remote(simix_global_p));
-
- MC_process_refresh_simix_process_list(
- this, this->smx_process_infos, simix_global.process_list);
- MC_process_refresh_simix_process_list(
- this, this->smx_old_process_infos, simix_global.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 process in the local
- * address space.
- *
- * @param process the MCed process
- * @param req the simcall (copied in the local process)
- */
-smx_process_t MC_smx_simcall_get_issuer(smx_simcall_t req)
-{
- if (mc_mode == MC_MODE_CLIENT)
- return req->issuer;
-
- // This is the address of the smx_process in the MCed process:
- void* address = req->issuer;
+ 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_);
- // Lookup by address:
- for (auto& p : mc_model_checker->process().simix_processes())
- if (p.address == address)
- return &p.copy;
- for (auto& p : mc_model_checker->process().old_simix_processes())
- if (p.address == address)
- return &p.copy;
-
- xbt_die("Issuer not found");
+ this->cache_flags_ |= RemoteProcess::cache_simix_processes;
}
-smx_process_t MC_smx_resolve_process(smx_process_t process_remote_address)
-{
- if (!process_remote_address)
- return nullptr;
- if (mc_mode == MC_MODE_CLIENT)
- return process_remote_address;
-
- simgrid::mc::SimixProcessInformation* process_info = MC_smx_resolve_process_info(process_remote_address);
- if (process_info)
- return &process_info->copy;
- else
- return nullptr;
}
-
-simgrid::mc::SimixProcessInformation* MC_smx_resolve_process_info(smx_process_t process_remote_address)
-{
- if (mc_mode == MC_MODE_CLIENT)
- xbt_die("No process_info for local process is not enabled.");
- for (auto& process_info : mc_model_checker->process().smx_process_infos)
- if (process_info.address == process_remote_address)
- return &process_info;
- for (auto& process_info : mc_model_checker->process().smx_old_process_infos)
- if (process_info.address == process_remote_address)
- return &process_info;
- xbt_die("Process info not found");
-}
-
-const char* MC_smx_process_get_host_name(smx_process_t p)
-{
- if (mc_mode == MC_MODE_CLIENT)
- return sg_host_get_name(p->host);
-
- simgrid::mc::Process* process = &mc_model_checker->process();
-
- /* 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 pratice 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::SimixProcessInformation* info = MC_smx_process_get_info(p);
- simgrid::xbt::string_data remote_string;
- auto remote_string_address = remote(
- (simgrid::xbt::string_data*) ((char*) p->host + offset));
- process->read_bytes(&remote_string, sizeof(remote_string), 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);
- return info->hostname;
-}
-
-const char* MC_smx_process_get_name(smx_process_t p)
-{
- simgrid::mc::Process* process = &mc_model_checker->process();
- if (mc_mode == MC_MODE_CLIENT)
- return p->name;
- if (!p->name)
- return nullptr;
-
- simgrid::mc::SimixProcessInformation* info = MC_smx_process_get_info(p);
- if (info->name.empty())
- info->name = process->read_string(p->name);
- return info->name.c_str();
-}
-
-#if HAVE_SMPI
-int MC_smpi_process_count(void)
-{
- if (mc_mode == MC_MODE_CLIENT)
- 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;
-}
-
}