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/mc/checker/SimcallObserver.hpp"
10 #include "src/mc/remote/RemoteProcess.hpp"
11 #include "src/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 xbt_assert(instance_->channel_.send(message) == 0, "Could not send the initial message with addresses.");
72 instance_->handle_messages();
73 return instance_.get();
76 void AppSide::handle_deadlock_check(const s_mc_message_t*) const
78 bool deadlock = false;
79 if (not simix_global->process_list.empty()) {
81 for (auto const& kv : simix_global->process_list)
82 if (simgrid::mc::actor_is_enabled(kv.second)) {
89 s_mc_message_int_t answer{MessageType::DEADLOCK_CHECK_REPLY, deadlock};
90 xbt_assert(channel_.send(answer) == 0, "Could not send response");
92 void AppSide::handle_continue(const s_mc_message_t*) const
96 void AppSide::handle_simcall(const s_mc_message_simcall_handle_t* message) const
98 kernel::actor::ActorImpl* process = kernel::actor::ActorImpl::by_PID(message->pid_);
99 xbt_assert(process != nullptr, "Invalid pid %lu", message->pid_);
100 process->simcall_handle(message->times_considered_);
101 if (channel_.send(MessageType::WAITING))
102 xbt_die("Could not send MESSAGE_WAITING to model-checker");
105 void AppSide::handle_actor_enabled(const s_mc_message_actor_enabled_t* msg) const
107 bool res = simgrid::mc::actor_is_enabled(kernel::actor::ActorImpl::by_PID(msg->aid));
108 s_mc_message_int_t answer{MessageType::ACTOR_ENABLED_REPLY, res};
109 channel_.send(answer);
112 #define assert_msg_size(_name_, _type_) \
113 xbt_assert(received_size == sizeof(_type_), "Unexpected size for " _name_ " (%zd != %zu)", received_size, \
116 void AppSide::handle_messages() const
119 XBT_DEBUG("Waiting messages from model-checker");
121 std::array<char, MC_MESSAGE_LENGTH> message_buffer;
122 ssize_t received_size = channel_.receive(message_buffer.data(), message_buffer.size());
124 xbt_assert(received_size >= 0, "Could not receive commands from the model-checker");
126 const s_mc_message_t* message = (s_mc_message_t*)message_buffer.data();
127 switch (message->type) {
128 case MessageType::DEADLOCK_CHECK:
129 assert_msg_size("DEADLOCK_CHECK", s_mc_message_t);
130 handle_deadlock_check(message);
133 case MessageType::CONTINUE:
134 assert_msg_size("MESSAGE_CONTINUE", s_mc_message_t);
135 handle_continue(message);
138 case MessageType::SIMCALL_HANDLE:
139 assert_msg_size("SIMCALL_HANDLE", s_mc_message_simcall_handle_t);
140 handle_simcall((s_mc_message_simcall_handle_t*)message_buffer.data());
143 case MessageType::SIMCALL_IS_VISIBLE: {
144 assert_msg_size("SIMCALL_IS_VISIBLE", s_mc_message_simcall_is_visible_t);
145 auto msg_simcall = (s_mc_message_simcall_is_visible_t*)message_buffer.data();
146 const kernel::actor::ActorImpl* actor = kernel::actor::ActorImpl::by_PID(msg_simcall->aid);
147 xbt_assert(actor != nullptr, "Invalid pid %d", msg_simcall->aid);
148 xbt_assert(actor->simcall_.observer_, "The transition of %s has no observer", actor->get_cname());
149 bool value = actor->simcall_.observer_->is_visible();
152 s_mc_message_simcall_is_visible_answer_t answer{MessageType::SIMCALL_IS_VISIBLE_ANSWER, value};
153 xbt_assert(channel_.send(answer) == 0, "Could not send response");
157 case MessageType::SIMCALL_TO_STRING: {
158 assert_msg_size("SIMCALL_TO_STRING", s_mc_message_simcall_to_string_t);
159 auto msg_simcall = (s_mc_message_simcall_to_string_t*)message_buffer.data();
160 const kernel::actor::ActorImpl* actor = kernel::actor::ActorImpl::by_PID(msg_simcall->aid);
161 xbt_assert(actor != nullptr, "Invalid pid %d", msg_simcall->aid);
162 xbt_assert(actor->simcall_.observer_, "The transition of %s has no observer", actor->get_cname());
163 std::string value = actor->simcall_.observer_->to_string(msg_simcall->time_considered);
166 s_mc_message_simcall_to_string_answer_t answer{MessageType::SIMCALL_TO_STRING_ANSWER, {0}};
167 value.copy(answer.value, (sizeof answer.value) - 1); // last byte was set to '\0' by initialization above
168 xbt_assert(channel_.send(answer) == 0, "Could not send response");
172 case MessageType::SIMCALL_DOT_LABEL: {
173 assert_msg_size("SIMCALL_DOT_LABEL", s_mc_message_simcall_to_string_t);
174 auto msg_simcall = (s_mc_message_simcall_to_string_t*)message_buffer.data();
175 const kernel::actor::ActorImpl* actor = kernel::actor::ActorImpl::by_PID(msg_simcall->aid);
176 xbt_assert(actor != nullptr, "Invalid pid %d", msg_simcall->aid);
177 xbt_assert(actor->simcall_.observer_, "The transition of %s has no observer", actor->get_cname());
178 std::string value = actor->simcall_.observer_->dot_label();
181 s_mc_message_simcall_to_string_answer_t answer{MessageType::SIMCALL_TO_STRING_ANSWER, {0}};
182 value.copy(answer.value, (sizeof answer.value) - 1); // last byte was set to '\0' by initialization above
183 xbt_assert(channel_.send(answer) == 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());
193 xbt_die("Received unexpected message %s (%i)", to_c_str(message->type), static_cast<int>(message->type));
199 void AppSide::main_loop() const
202 simgrid::mc::wait_for_requests();
203 xbt_assert(channel_.send(MessageType::WAITING) == 0, "Could not send WAITING message to model-checker");
204 this->handle_messages();
208 void AppSide::report_assertion_failure() const
210 if (channel_.send(MessageType::ASSERTION_FAILED))
211 xbt_die("Could not send assertion to model-checker");
212 this->handle_messages();
215 void AppSide::ignore_memory(void* addr, std::size_t size) const
217 s_mc_message_ignore_memory_t message;
218 message.type = MessageType::IGNORE_MEMORY;
219 message.addr = (std::uintptr_t)addr;
221 if (channel_.send(message))
222 xbt_die("Could not send IGNORE_MEMORY message to model-checker");
225 void AppSide::ignore_heap(void* address, std::size_t size) const
227 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
229 s_mc_message_ignore_heap_t message;
230 message.type = MessageType::IGNORE_HEAP;
231 message.address = address;
233 message.block = ((char*)address - (char*)heap->heapbase) / BLOCKSIZE + 1;
234 if (heap->heapinfo[message.block].type == 0) {
235 message.fragment = -1;
236 heap->heapinfo[message.block].busy_block.ignore++;
238 message.fragment = (ADDR2UINT(address) % BLOCKSIZE) >> heap->heapinfo[message.block].type;
239 heap->heapinfo[message.block].busy_frag.ignore[message.fragment]++;
242 if (channel_.send(message))
243 xbt_die("Could not send ignored region to MCer");
246 void AppSide::unignore_heap(void* address, std::size_t size) const
248 s_mc_message_ignore_memory_t message;
249 message.type = MessageType::UNIGNORE_HEAP;
250 message.addr = (std::uintptr_t)address;
252 if (channel_.send(message))
253 xbt_die("Could not send IGNORE_HEAP message to model-checker");
256 void AppSide::declare_symbol(const char* name, int* value) const
258 s_mc_message_register_symbol_t message;
259 message.type = MessageType::REGISTER_SYMBOL;
260 if (strlen(name) + 1 > message.name.size())
261 xbt_die("Symbol is too long");
262 strncpy(message.name.data(), name, message.name.size());
263 message.callback = nullptr;
264 message.data = value;
265 if (channel_.send(message))
266 xbt_die("Could send REGISTER_SYMBOL message to model-checker");
269 void AppSide::declare_stack(void* stack, size_t size, ucontext_t* context) const
271 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
273 s_stack_region_t region;
274 memset(®ion, 0, sizeof(region));
275 region.address = stack;
276 region.context = context;
278 region.block = ((char*)stack - (char*)heap->heapbase) / BLOCKSIZE + 1;
280 s_mc_message_stack_region_t message;
281 message.type = MessageType::STACK_REGION;
282 message.stack_region = region;
283 if (channel_.send(message))
284 xbt_die("Could not send STACK_REGION to model-checker");
287 } // namespace simgrid