1 /* Copyright (c) 2015-2021. 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 "src/internal_config.h"
8 #include "src/kernel/actor/ActorImpl.hpp"
9 #include "src/kernel/actor/SimcallObserver.hpp"
10 #include "src/mc/remote/RemoteProcess.hpp"
11 #include "xbt/xbt_modinter.h" /* mmalloc_preinit to get the default mmalloc arena address */
12 #include <simgrid/modelchecker.h>
18 #include <sys/ptrace.h>
19 #include <sys/socket.h>
20 #include <sys/types.h>
22 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_client, mc, "MC client logic");
27 std::unique_ptr<AppSide> AppSide::instance_;
29 AppSide* AppSide::initialize()
31 if (not std::getenv(MC_ENV_SOCKET_FD)) // We are not in MC mode: don't initialize the MC world
34 // Do not break if we are called multiple times:
36 return instance_.get();
38 _sg_do_model_check = 1;
40 // Fetch socket from MC_ENV_SOCKET_FD:
41 const char* fd_env = std::getenv(MC_ENV_SOCKET_FD);
42 int fd = xbt_str_parse_int(fd_env, "Variable '" MC_ENV_SOCKET_FD "' should contain a number but contains '%s'");
43 XBT_DEBUG("Model-checked application found socket FD %i", fd);
45 // Check the socket type/validity:
47 socklen_t socklen = sizeof(type);
48 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &socklen) != 0)
49 xbt_die("Could not check socket type");
50 xbt_assert(type == SOCK_SEQPACKET, "Unexpected socket type %i", type);
51 XBT_DEBUG("Model-checked application found expected socket type");
53 instance_ = std::make_unique<simgrid::mc::AppSide>(fd);
55 // Wait for the model-checker:
58 ptrace(PTRACE_TRACEME, 0, nullptr, nullptr);
60 ptrace(PT_TRACE_ME, 0, nullptr, 0);
62 #error "no ptrace equivalent coded for this platform"
64 if (errno != 0 || raise(SIGSTOP) != 0)
65 xbt_die("Could not wait for the model-checker (errno = %d: %s)", errno, strerror(errno));
67 s_mc_message_initial_addresses_t message{
68 MessageType::INITIAL_ADDRESSES, mmalloc_preinit(), simgrid::kernel::actor::get_maxpid_addr(),
69 simgrid::simix::simix_global_get_actors_addr(), simgrid::simix::simix_global_get_dead_actors_addr()};
70 int send_res = instance_->channel_.send(message);
71 xbt_assert(send_res == 0, "Could not send the initial message with addresses.");
73 instance_->handle_messages();
74 return instance_.get();
77 void AppSide::handle_deadlock_check(const s_mc_message_t*) const
79 bool deadlock = false;
80 if (not simix_global->process_list.empty()) {
82 for (auto const& kv : simix_global->process_list)
83 if (simgrid::mc::actor_is_enabled(kv.second)) {
90 s_mc_message_int_t answer{MessageType::DEADLOCK_CHECK_REPLY, deadlock};
91 int send_res = channel_.send(answer);
92 xbt_assert(send_res == 0, "Could not send response");
94 void AppSide::handle_simcall_execute(const s_mc_message_simcall_handle_t* message) const
96 kernel::actor::ActorImpl* process = kernel::actor::ActorImpl::by_pid(message->pid_);
97 xbt_assert(process != nullptr, "Invalid pid %lu", message->pid_);
98 process->simcall_handle(message->times_considered_);
99 if (channel_.send(MessageType::WAITING))
100 xbt_die("Could not send MESSAGE_WAITING to model-checker");
103 void AppSide::handle_actor_enabled(const s_mc_message_actor_enabled_t* msg) const
105 bool res = simgrid::mc::actor_is_enabled(kernel::actor::ActorImpl::by_pid(msg->aid));
106 s_mc_message_int_t answer{MessageType::ACTOR_ENABLED_REPLY, res};
107 channel_.send(answer);
110 #define assert_msg_size(_name_, _type_) \
111 xbt_assert(received_size == sizeof(_type_), "Unexpected size for " _name_ " (%zd != %zu)", received_size, \
114 void AppSide::handle_messages() const
116 while (true) { // Until we get a CONTINUE message
117 XBT_DEBUG("Waiting messages from model-checker");
119 std::array<char, MC_MESSAGE_LENGTH> message_buffer;
120 ssize_t received_size = channel_.receive(message_buffer.data(), message_buffer.size());
122 xbt_assert(received_size >= 0, "Could not receive commands from the model-checker");
124 const s_mc_message_t* message = (s_mc_message_t*)message_buffer.data();
125 switch (message->type) {
126 case MessageType::DEADLOCK_CHECK:
127 assert_msg_size("DEADLOCK_CHECK", s_mc_message_t);
128 handle_deadlock_check(message);
131 case MessageType::CONTINUE:
132 assert_msg_size("MESSAGE_CONTINUE", s_mc_message_t);
135 case MessageType::SIMCALL_HANDLE:
136 assert_msg_size("SIMCALL_HANDLE", s_mc_message_simcall_handle_t);
137 handle_simcall_execute((s_mc_message_simcall_handle_t*)message_buffer.data());
140 case MessageType::SIMCALL_IS_VISIBLE: {
141 assert_msg_size("SIMCALL_IS_VISIBLE", s_mc_message_simcall_is_visible_t);
142 auto msg_simcall = (s_mc_message_simcall_is_visible_t*)message_buffer.data();
143 const kernel::actor::ActorImpl* actor = kernel::actor::ActorImpl::by_pid(msg_simcall->aid);
144 xbt_assert(actor != nullptr, "Invalid pid %d", msg_simcall->aid);
145 xbt_assert(actor->simcall_.observer_, "The transition of %s has no observer", actor->get_cname());
146 bool value = actor->simcall_.observer_->is_visible();
149 s_mc_message_simcall_is_visible_answer_t answer{MessageType::SIMCALL_IS_VISIBLE_ANSWER, value};
150 int send_res = channel_.send(answer);
151 xbt_assert(send_res == 0, "Could not send response");
155 case MessageType::SIMCALL_TO_STRING: {
156 assert_msg_size("SIMCALL_TO_STRING", s_mc_message_simcall_to_string_t);
157 auto msg_simcall = (s_mc_message_simcall_to_string_t*)message_buffer.data();
158 const kernel::actor::ActorImpl* actor = kernel::actor::ActorImpl::by_pid(msg_simcall->aid);
159 xbt_assert(actor != nullptr, "Invalid pid %d", msg_simcall->aid);
160 xbt_assert(actor->simcall_.observer_, "The transition of %s has no observer", actor->get_cname());
161 std::string value = actor->simcall_.observer_->to_string(msg_simcall->time_considered);
164 s_mc_message_simcall_to_string_answer_t answer{MessageType::SIMCALL_TO_STRING_ANSWER, {0}};
165 value.copy(answer.value, (sizeof answer.value) - 1); // last byte was set to '\0' by initialization above
166 int send_res = channel_.send(answer);
167 xbt_assert(send_res == 0, "Could not send response");
171 case MessageType::SIMCALL_DOT_LABEL: {
172 assert_msg_size("SIMCALL_DOT_LABEL", s_mc_message_simcall_to_string_t);
173 auto msg_simcall = (s_mc_message_simcall_to_string_t*)message_buffer.data();
174 const kernel::actor::ActorImpl* actor = kernel::actor::ActorImpl::by_pid(msg_simcall->aid);
175 xbt_assert(actor != nullptr, "Invalid pid %d", msg_simcall->aid);
176 xbt_assert(actor->simcall_.observer_, "The transition of %s has no observer", actor->get_cname());
177 std::string value = actor->simcall_.observer_->dot_label();
180 s_mc_message_simcall_to_string_answer_t answer{MessageType::SIMCALL_TO_STRING_ANSWER, {0}};
181 value.copy(answer.value, (sizeof answer.value) - 1); // last byte was set to '\0' by initialization above
182 int send_res = channel_.send(answer);
183 xbt_assert(send_res == 0, "Could not send response");
187 case MessageType::ACTOR_ENABLED:
188 assert_msg_size("ACTOR_ENABLED", s_mc_message_actor_enabled_t);
189 handle_actor_enabled((s_mc_message_actor_enabled_t*)message_buffer.data());
192 case MessageType::FINALIZE: {
194 XBT_INFO("Finalize. Smpi_enabled: %d", (int)smpi_enabled());
195 simix_global->display_all_actor_status();
199 int send_res = channel_.send(MessageType::DEADLOCK_CHECK_REPLY); // really?
200 xbt_assert(send_res == 0, "Could not answer to FINALIZE");
205 xbt_die("Received unexpected message %s (%i)", to_c_str(message->type), static_cast<int>(message->type));
211 void AppSide::main_loop() const
214 simgrid::mc::execute_actors();
215 int send_res = channel_.send(MessageType::WAITING);
216 xbt_assert(send_res == 0, "Could not send WAITING message to model-checker");
217 this->handle_messages();
221 void AppSide::report_assertion_failure() const
223 if (channel_.send(MessageType::ASSERTION_FAILED))
224 xbt_die("Could not send assertion to model-checker");
225 this->handle_messages();
228 void AppSide::ignore_memory(void* addr, std::size_t size) const
230 s_mc_message_ignore_memory_t message;
231 message.type = MessageType::IGNORE_MEMORY;
232 message.addr = (std::uintptr_t)addr;
234 if (channel_.send(message))
235 xbt_die("Could not send IGNORE_MEMORY message to model-checker");
238 void AppSide::ignore_heap(void* address, std::size_t size) const
240 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
242 s_mc_message_ignore_heap_t message;
243 message.type = MessageType::IGNORE_HEAP;
244 message.address = address;
246 message.block = ((char*)address - (char*)heap->heapbase) / BLOCKSIZE + 1;
247 if (heap->heapinfo[message.block].type == 0) {
248 message.fragment = -1;
249 heap->heapinfo[message.block].busy_block.ignore++;
251 message.fragment = (ADDR2UINT(address) % BLOCKSIZE) >> heap->heapinfo[message.block].type;
252 heap->heapinfo[message.block].busy_frag.ignore[message.fragment]++;
255 if (channel_.send(message))
256 xbt_die("Could not send ignored region to MCer");
259 void AppSide::unignore_heap(void* address, std::size_t size) const
261 s_mc_message_ignore_memory_t message;
262 message.type = MessageType::UNIGNORE_HEAP;
263 message.addr = (std::uintptr_t)address;
265 if (channel_.send(message))
266 xbt_die("Could not send IGNORE_HEAP message to model-checker");
269 void AppSide::declare_symbol(const char* name, int* value) const
271 s_mc_message_register_symbol_t message;
272 message.type = MessageType::REGISTER_SYMBOL;
273 if (strlen(name) + 1 > message.name.size())
274 xbt_die("Symbol is too long");
275 strncpy(message.name.data(), name, message.name.size());
276 message.callback = nullptr;
277 message.data = value;
278 if (channel_.send(message))
279 xbt_die("Could send REGISTER_SYMBOL message to model-checker");
282 void AppSide::declare_stack(void* stack, size_t size, ucontext_t* context) const
284 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
286 s_stack_region_t region;
287 memset(®ion, 0, sizeof(region));
288 region.address = stack;
289 region.context = context;
291 region.block = ((char*)stack - (char*)heap->heapbase) / BLOCKSIZE + 1;
293 s_mc_message_stack_region_t message;
294 message.type = MessageType::STACK_REGION;
295 message.stack_region = region;
296 if (channel_.send(message))
297 xbt_die("Could not send STACK_REGION to model-checker");
300 } // namespace simgrid