1 /* Copyright (c) 2015-2022. 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 "src/mc/remote/AppSide.hpp"
7 #include "simgrid/s4u/Host.hpp"
8 #include "src/internal_config.h"
9 #include "src/kernel/EngineImpl.hpp"
10 #include "src/kernel/actor/ActorImpl.hpp"
11 #include "src/kernel/actor/SimcallObserver.hpp"
12 #include "src/mc/mc_base.hpp"
13 #include "src/mc/mc_config.hpp"
14 #include "src/mc/remote/RemoteProcess.hpp"
16 #include "src/smpi/include/private.hpp"
18 #include "xbt/coverage.h"
20 #include "xbt/xbt_modinter.h" /* mmalloc_preinit to get the default mmalloc arena address */
21 #include <simgrid/modelchecker.h>
24 #include <cstdio> // setvbuf
28 #include <sys/ptrace.h>
29 #include <sys/socket.h>
30 #include <sys/types.h>
32 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_client, mc, "MC client logic");
34 namespace simgrid::mc {
36 std::unique_ptr<AppSide> AppSide::instance_;
38 AppSide* AppSide::initialize()
40 if (not std::getenv(MC_ENV_SOCKET_FD)) // We are not in MC mode: don't initialize the MC world
43 // Do not break if we are called multiple times:
45 return instance_.get();
47 simgrid::mc::cfg_do_model_check = 1;
49 setvbuf(stdout, nullptr, _IOLBF, 0);
51 // Fetch socket from MC_ENV_SOCKET_FD:
52 const char* fd_env = std::getenv(MC_ENV_SOCKET_FD);
53 int fd = xbt_str_parse_int(fd_env, "Not a number in variable '" MC_ENV_SOCKET_FD "'");
54 XBT_DEBUG("Model-checked application found socket FD %i", fd);
56 // Check the socket type/validity:
58 socklen_t socklen = sizeof(type);
59 xbt_assert(getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &socklen) == 0, "Could not check socket type");
60 xbt_assert(type == SOCK_SEQPACKET, "Unexpected socket type %i", type);
61 XBT_DEBUG("Model-checked application found expected socket type");
63 instance_ = std::make_unique<simgrid::mc::AppSide>(fd);
65 // Wait for the model-checker:
68 ptrace(PTRACE_TRACEME, 0, nullptr, nullptr);
70 ptrace(PT_TRACE_ME, 0, nullptr, 0);
72 #error "no ptrace equivalent coded for this platform"
74 xbt_assert(errno == 0 && raise(SIGSTOP) == 0, "Could not wait for the model-checker (errno = %d: %s)", errno,
77 s_mc_message_initial_addresses_t message{MessageType::INITIAL_ADDRESSES, mmalloc_get_current_heap(),
78 kernel::actor::ActorImpl::get_maxpid_addr()};
79 xbt_assert(instance_->channel_.send(message) == 0, "Could not send the initial message with addresses.");
81 instance_->handle_messages();
82 return instance_.get();
85 void AppSide::handle_deadlock_check(const s_mc_message_t*) const
87 const auto& actor_list = kernel::EngineImpl::get_instance()->get_actor_list();
88 bool deadlock = not actor_list.empty() && std::none_of(begin(actor_list), end(actor_list), [](const auto& kv) {
89 return mc::actor_is_enabled(kv.second);
93 s_mc_message_int_t answer{MessageType::DEADLOCK_CHECK_REPLY, deadlock};
94 xbt_assert(channel_.send(answer) == 0, "Could not send response");
96 void AppSide::handle_simcall_execute(const s_mc_message_simcall_execute_t* message) const
98 kernel::actor::ActorImpl* actor = kernel::EngineImpl::get_instance()->get_actor_by_pid(message->aid_);
99 xbt_assert(actor != nullptr, "Invalid pid %ld", message->aid_);
101 // The client may send some messages to the server while processing the transition
102 actor->simcall_handle(message->times_considered_);
103 // Say the server that the transition is over and that it should proceed
104 xbt_assert(channel_.send(MessageType::WAITING) == 0, "Could not send MESSAGE_WAITING to model-checker");
106 // Finish the RPC from the server: return a serialized observer, to build a Transition on Checker side
107 s_mc_message_simcall_execute_answer_t answer;
108 memset(&answer, 0, sizeof(answer));
109 answer.type = MessageType::SIMCALL_EXECUTE_ANSWER;
110 std::stringstream stream;
111 if (actor->simcall_.observer_ != nullptr) {
112 actor->simcall_.observer_->serialize(stream);
114 stream << (short)mc::Transition::Type::UNKNOWN;
116 std::string str = stream.str();
117 xbt_assert(str.size() + 1 <= answer.buffer.size(),
118 "The serialized simcall is too large for the buffer. Please fix the code.");
119 strncpy(answer.buffer.data(), str.c_str(), answer.buffer.size() - 1);
120 answer.buffer.back() = '\0';
122 XBT_DEBUG("send SIMCALL_EXECUTE_ANSWER(%s) ~> '%s'", actor->get_cname(), str.c_str());
123 xbt_assert(channel_.send(answer) == 0, "Could not send response");
126 void AppSide::handle_finalize(const s_mc_message_int_t* msg) const
128 bool terminate_asap = msg->value;
129 XBT_DEBUG("Finalize (terminate = %d)", (int)terminate_asap);
130 if (not terminate_asap) {
131 if (XBT_LOG_ISENABLED(mc_client, xbt_log_priority_debug))
132 kernel::EngineImpl::get_instance()->display_all_actor_status();
134 XBT_DEBUG("Smpi_enabled: %d", SMPI_is_inited());
135 if (SMPI_is_inited())
139 coverage_checkpoint();
140 xbt_assert(channel_.send(MessageType::FINALIZE_REPLY) == 0, "Could not answer to FINALIZE");
145 void AppSide::handle_actors_status() const
147 auto const& actor_list = kernel::EngineImpl::get_instance()->get_actor_list();
148 int count = actor_list.size();
149 XBT_DEBUG("Serialize the actors to answer ACTORS_STATUS from the checker. %d actors to go.", count);
151 struct s_mc_message_actors_status_answer_t answer {
152 MessageType::ACTORS_STATUS_REPLY, count
154 std::vector<s_mc_message_actors_status_one_t> status(count);
156 for (auto const& [aid, actor] : actor_list) {
158 status[i].enabled = mc::actor_is_enabled(actor);
159 status[i].max_considered = actor->simcall_.observer_->get_max_consider();
162 xbt_assert(channel_.send(answer) == 0, "Could not send ACTORS_STATUS_REPLY msg");
163 if (answer.count > 0) {
164 size_t size = status.size() * sizeof(s_mc_message_actors_status_one_t);
165 xbt_assert(channel_.send(status.data(), size) == 0, "Could not send ACTORS_STATUS_REPLY data");
169 #define assert_msg_size(_name_, _type_) \
170 xbt_assert(received_size == sizeof(_type_), "Unexpected size for " _name_ " (%zd != %zu)", received_size, \
173 void AppSide::handle_messages() const
175 while (true) { // Until we get a CONTINUE message
176 XBT_DEBUG("Waiting messages from model-checker");
178 std::array<char, MC_MESSAGE_LENGTH> message_buffer;
179 ssize_t received_size = channel_.receive(message_buffer.data(), message_buffer.size());
181 xbt_assert(received_size >= 0, "Could not receive commands from the model-checker");
183 const s_mc_message_t* message = (s_mc_message_t*)message_buffer.data();
184 switch (message->type) {
185 case MessageType::DEADLOCK_CHECK:
186 assert_msg_size("DEADLOCK_CHECK", s_mc_message_t);
187 handle_deadlock_check(message);
190 case MessageType::CONTINUE:
191 assert_msg_size("MESSAGE_CONTINUE", s_mc_message_t);
194 case MessageType::SIMCALL_EXECUTE:
195 assert_msg_size("SIMCALL_EXECUTE", s_mc_message_simcall_execute_t);
196 handle_simcall_execute((s_mc_message_simcall_execute_t*)message_buffer.data());
199 case MessageType::FINALIZE:
200 assert_msg_size("FINALIZE", s_mc_message_int_t);
201 handle_finalize((s_mc_message_int_t*)message_buffer.data());
204 case MessageType::ACTORS_STATUS:
205 assert_msg_size("ACTORS_STATUS", s_mc_message_t);
206 handle_actors_status();
210 xbt_die("Received unexpected message %s (%i)", to_c_str(message->type), static_cast<int>(message->type));
216 void AppSide::main_loop() const
218 simgrid::mc::processes_time.resize(simgrid::kernel::actor::ActorImpl::get_maxpid());
219 MC_ignore_heap(simgrid::mc::processes_time.data(),
220 simgrid::mc::processes_time.size() * sizeof(simgrid::mc::processes_time[0]));
222 coverage_checkpoint();
224 simgrid::mc::execute_actors();
225 xbt_assert(channel_.send(MessageType::WAITING) == 0, "Could not send WAITING message to model-checker");
226 this->handle_messages();
230 void AppSide::report_assertion_failure() const
232 xbt_assert(channel_.send(MessageType::ASSERTION_FAILED) == 0, "Could not send assertion to model-checker");
233 this->handle_messages();
236 void AppSide::ignore_memory(void* addr, std::size_t size) const
238 if (not MC_is_active())
241 s_mc_message_ignore_memory_t message;
242 message.type = MessageType::IGNORE_MEMORY;
243 message.addr = (std::uintptr_t)addr;
245 xbt_assert(channel_.send(message) == 0, "Could not send IGNORE_MEMORY message to model-checker");
248 void AppSide::ignore_heap(void* address, std::size_t size) const
250 if (not MC_is_active())
253 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
255 s_mc_message_ignore_heap_t message;
256 message.type = MessageType::IGNORE_HEAP;
257 message.address = address;
259 message.block = ((char*)address - (char*)heap->heapbase) / BLOCKSIZE + 1;
260 if (heap->heapinfo[message.block].type == 0) {
261 message.fragment = -1;
262 heap->heapinfo[message.block].busy_block.ignore++;
264 message.fragment = (ADDR2UINT(address) % BLOCKSIZE) >> heap->heapinfo[message.block].type;
265 heap->heapinfo[message.block].busy_frag.ignore[message.fragment]++;
268 xbt_assert(channel_.send(message) == 0, "Could not send ignored region to MCer");
271 void AppSide::unignore_heap(void* address, std::size_t size) const
273 if (not MC_is_active())
276 s_mc_message_ignore_memory_t message;
277 message.type = MessageType::UNIGNORE_HEAP;
278 message.addr = (std::uintptr_t)address;
280 xbt_assert(channel_.send(message) == 0, "Could not send IGNORE_HEAP message to model-checker");
283 void AppSide::declare_symbol(const char* name, int* value) const
285 s_mc_message_register_symbol_t message;
286 memset(&message, 0, sizeof(message));
287 message.type = MessageType::REGISTER_SYMBOL;
288 xbt_assert(strlen(name) + 1 <= message.name.size(), "Symbol is too long");
289 strncpy(message.name.data(), name, message.name.size());
290 message.callback = nullptr;
291 message.data = value;
292 xbt_assert(channel_.send(message) == 0, "Could send REGISTER_SYMBOL message to model-checker");
295 /** Register a stack in the model checker
297 * The stacks are allocated in the heap. The MC handle them specifically
298 * when we analyze/compare the content of the heap so it must be told where
299 * they are with this function.
301 void AppSide::declare_stack(void* stack, size_t size, ucontext_t* context) const
303 if (not MC_is_active())
306 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
308 s_stack_region_t region;
309 memset(®ion, 0, sizeof(region));
310 region.address = stack;
311 region.context = context;
313 region.block = ((char*)stack - (char*)heap->heapbase) / BLOCKSIZE + 1;
315 s_mc_message_stack_region_t message;
316 message.type = MessageType::STACK_REGION;
317 message.stack_region = region;
318 xbt_assert(channel_.send(message) == 0, "Could not send STACK_REGION to model-checker");
320 } // namespace simgrid::mc