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 "src/internal_config.h"
8 #include "src/kernel/EngineImpl.hpp"
9 #include "src/kernel/actor/ActorImpl.hpp"
10 #include "src/kernel/actor/SimcallObserver.hpp"
11 #include "src/mc/mc_base.hpp"
12 #include "src/mc/remote/RemoteProcess.hpp"
14 #include "src/smpi/include/private.hpp"
16 #include "xbt/coverage.h"
18 #include "xbt/xbt_modinter.h" /* mmalloc_preinit to get the default mmalloc arena address */
19 #include <simgrid/modelchecker.h>
22 #include <cstdio> // setvbuf
26 #include <sys/ptrace.h>
27 #include <sys/socket.h>
28 #include <sys/types.h>
30 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_client, mc, "MC client logic");
35 std::unique_ptr<AppSide> AppSide::instance_;
37 AppSide* AppSide::initialize()
39 if (not std::getenv(MC_ENV_SOCKET_FD)) // We are not in MC mode: don't initialize the MC world
42 // Do not break if we are called multiple times:
44 return instance_.get();
46 _sg_do_model_check = 1;
48 setvbuf(stdout, nullptr, _IOLBF, 0);
50 // Fetch socket from MC_ENV_SOCKET_FD:
51 const char* fd_env = std::getenv(MC_ENV_SOCKET_FD);
52 int fd = xbt_str_parse_int(fd_env, "Not a number in variable '" MC_ENV_SOCKET_FD "'");
53 XBT_DEBUG("Model-checked application found socket FD %i", fd);
55 // Check the socket type/validity:
57 socklen_t socklen = sizeof(type);
58 xbt_assert(getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &socklen) == 0, "Could not check socket type");
59 xbt_assert(type == SOCK_SEQPACKET, "Unexpected socket type %i", type);
60 XBT_DEBUG("Model-checked application found expected socket type");
62 instance_ = std::make_unique<simgrid::mc::AppSide>(fd);
64 // Wait for the model-checker:
67 ptrace(PTRACE_TRACEME, 0, nullptr, nullptr);
69 ptrace(PT_TRACE_ME, 0, nullptr, 0);
71 #error "no ptrace equivalent coded for this platform"
73 xbt_assert(errno == 0 && raise(SIGSTOP) == 0, "Could not wait for the model-checker (errno = %d: %s)", errno,
76 s_mc_message_initial_addresses_t message{MessageType::INITIAL_ADDRESSES, mmalloc_preinit(),
77 kernel::actor::get_maxpid_addr(), kernel::get_actors_addr(),
78 kernel::get_dead_actors_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::actor::ActorImpl::by_pid(message->aid_);
99 xbt_assert(actor != nullptr, "Invalid pid %ld", message->aid_);
100 simgrid::kernel::actor::SimcallObserver* observer = nullptr;
101 if (actor->simcall_.observer_ != nullptr) {
102 observer = actor->simcall_.observer_->clone();
103 actor->observer_stack_.push_back(observer);
105 // Finish the RPC from the server: we need to return a pointer to the observer, saved in a stable storage
106 s_mc_message_simcall_execute_answer_t answer{MessageType::SIMCALL_EXECUTE_ANSWER, observer};
107 XBT_DEBUG("send SIMCALL_EXECUTE_ANSWER(%p)", observer);
108 xbt_assert(channel_.send(answer) == 0, "Could not send response");
110 // The client may send some messages to the server while processing the transition
111 actor->simcall_handle(message->times_considered_);
113 // Say the server that the transition is over and that it should proceed
114 xbt_assert(channel_.send(MessageType::WAITING) == 0, "Could not send MESSAGE_WAITING to model-checker");
117 void AppSide::handle_actor_enabled(const s_mc_message_actor_enabled_t* msg) const
119 bool res = mc::actor_is_enabled(kernel::actor::ActorImpl::by_pid(msg->aid));
120 s_mc_message_int_t answer{MessageType::ACTOR_ENABLED_REPLY, res};
121 XBT_DEBUG("Actor %ld %s enabled", msg->aid, (res ? "IS" : "is NOT"));
122 xbt_assert(channel_.send(answer) == 0, "Could not send ACTOR_ENABLED_REPLY");
125 #define assert_msg_size(_name_, _type_) \
126 xbt_assert(received_size == sizeof(_type_), "Unexpected size for " _name_ " (%zd != %zu)", received_size, \
129 void AppSide::handle_messages() const
131 while (true) { // Until we get a CONTINUE message
132 XBT_DEBUG("Waiting messages from model-checker");
134 std::array<char, MC_MESSAGE_LENGTH> message_buffer;
135 ssize_t received_size = channel_.receive(message_buffer.data(), message_buffer.size());
137 xbt_assert(received_size >= 0, "Could not receive commands from the model-checker");
139 const s_mc_message_t* message = (s_mc_message_t*)message_buffer.data();
140 switch (message->type) {
141 case MessageType::DEADLOCK_CHECK:
142 assert_msg_size("DEADLOCK_CHECK", s_mc_message_t);
143 handle_deadlock_check(message);
146 case MessageType::CONTINUE:
147 assert_msg_size("MESSAGE_CONTINUE", s_mc_message_t);
150 case MessageType::SIMCALL_EXECUTE:
151 assert_msg_size("SIMCALL_EXECUTE", s_mc_message_simcall_execute_t);
152 handle_simcall_execute((s_mc_message_simcall_execute_t*)message_buffer.data());
155 case MessageType::SIMCALL_IS_VISIBLE: {
156 assert_msg_size("SIMCALL_IS_VISIBLE", s_mc_message_simcall_is_visible_t);
157 auto msg_simcall = (s_mc_message_simcall_is_visible_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 %ld", msg_simcall->aid);
160 xbt_assert(actor->simcall_.observer_, "The transition of %s has no observer", actor->get_cname());
161 bool value = actor->simcall_.observer_->is_visible();
164 s_mc_message_simcall_is_visible_answer_t answer{MessageType::SIMCALL_IS_VISIBLE_ANSWER, value};
165 xbt_assert(channel_.send(answer) == 0, "Could not send response");
169 case MessageType::SIMCALL_TO_STRING: {
170 assert_msg_size("SIMCALL_TO_STRING", s_mc_message_simcall_to_string_t);
171 auto msg_simcall = (s_mc_message_simcall_to_string_t*)message_buffer.data();
172 const kernel::actor::ActorImpl* actor = kernel::actor::ActorImpl::by_pid(msg_simcall->aid);
173 xbt_assert(actor != nullptr, "Invalid pid %ld", msg_simcall->aid);
174 xbt_assert(actor->simcall_.observer_, "The transition of %s has no observer", actor->get_cname());
175 std::string value = actor->simcall_.observer_->to_string(msg_simcall->time_considered);
178 s_mc_message_simcall_to_string_answer_t answer{MessageType::SIMCALL_TO_STRING_ANSWER, {0}};
179 value.copy(answer.value, (sizeof answer.value) - 1); // last byte was set to '\0' by initialization above
180 xbt_assert(channel_.send(answer) == 0, "Could not send response");
184 case MessageType::SIMCALLS_DEPENDENT: {
185 assert_msg_size("SIMCALLS_DEPENDENT", s_mc_message_simcalls_dependent_t);
186 auto msg_simcalls = (s_mc_message_simcalls_dependent_t*)message_buffer.data();
187 auto* obs1 = msg_simcalls->obs1;
188 auto* obs2 = msg_simcalls->obs2;
191 if (obs1 != nullptr && obs2 != nullptr)
192 res = obs1->depends(obs2);
194 XBT_DEBUG("return SIMCALLS_DEPENDENT(%s, %s) = %s", obs1->to_string(0).c_str(), obs2->to_string(0).c_str(),
195 (res ? "true" : "false"));
198 s_mc_message_simcalls_dependent_answer_t answer{MessageType::SIMCALLS_DEPENDENT_ANSWER, {0}};
200 xbt_assert(channel_.send(answer) == 0, "Could not send response");
204 case MessageType::SIMCALL_DOT_LABEL: {
205 assert_msg_size("SIMCALL_DOT_LABEL", s_mc_message_simcall_to_string_t);
206 auto msg_simcall = (s_mc_message_simcall_to_string_t*)message_buffer.data();
207 const kernel::actor::ActorImpl* actor = kernel::actor::ActorImpl::by_pid(msg_simcall->aid);
208 xbt_assert(actor != nullptr, "Invalid pid %ld", msg_simcall->aid);
209 xbt_assert(actor->simcall_.observer_, "The transition of %s has no observer", actor->get_cname());
210 std::string value = actor->simcall_.observer_->dot_label(msg_simcall->time_considered);
213 s_mc_message_simcall_to_string_answer_t answer{MessageType::SIMCALL_TO_STRING_ANSWER, {0}};
214 value.copy(answer.value, (sizeof answer.value) - 1); // last byte was set to '\0' by initialization above
215 xbt_assert(channel_.send(answer) == 0, "Could not send response");
219 case MessageType::ACTOR_ENABLED:
220 assert_msg_size("ACTOR_ENABLED", s_mc_message_actor_enabled_t);
221 handle_actor_enabled((s_mc_message_actor_enabled_t*)message_buffer.data());
224 case MessageType::FINALIZE: {
225 assert_msg_size("FINALIZE", s_mc_message_int_t);
226 bool terminate_asap = ((s_mc_message_int_t*)message_buffer.data())->value;
227 XBT_DEBUG("Finalize (terminate = %d)", (int)terminate_asap);
228 if (not terminate_asap) {
229 if (XBT_LOG_ISENABLED(mc_client, xbt_log_priority_debug))
230 kernel::EngineImpl::get_instance()->display_all_actor_status();
232 XBT_DEBUG("Smpi_enabled: %d", (int)smpi_enabled());
237 coverage_checkpoint();
238 xbt_assert(channel_.send(MessageType::DEADLOCK_CHECK_REPLY) == 0, // DEADLOCK_CHECK_REPLY, really?
239 "Could not answer to FINALIZE");
247 xbt_die("Received unexpected message %s (%i)", to_c_str(message->type), static_cast<int>(message->type));
253 void AppSide::main_loop() const
255 coverage_checkpoint();
257 simgrid::mc::execute_actors();
258 xbt_assert(channel_.send(MessageType::WAITING) == 0, "Could not send WAITING message to model-checker");
259 this->handle_messages();
263 void AppSide::report_assertion_failure() const
265 xbt_assert(channel_.send(MessageType::ASSERTION_FAILED) == 0, "Could not send assertion to model-checker");
266 this->handle_messages();
269 void AppSide::ignore_memory(void* addr, std::size_t size) const
271 s_mc_message_ignore_memory_t message;
272 message.type = MessageType::IGNORE_MEMORY;
273 message.addr = (std::uintptr_t)addr;
275 xbt_assert(channel_.send(message) == 0, "Could not send IGNORE_MEMORY message to model-checker");
278 void AppSide::ignore_heap(void* address, std::size_t size) const
280 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
282 s_mc_message_ignore_heap_t message;
283 message.type = MessageType::IGNORE_HEAP;
284 message.address = address;
286 message.block = ((char*)address - (char*)heap->heapbase) / BLOCKSIZE + 1;
287 if (heap->heapinfo[message.block].type == 0) {
288 message.fragment = -1;
289 heap->heapinfo[message.block].busy_block.ignore++;
291 message.fragment = (ADDR2UINT(address) % BLOCKSIZE) >> heap->heapinfo[message.block].type;
292 heap->heapinfo[message.block].busy_frag.ignore[message.fragment]++;
295 xbt_assert(channel_.send(message) == 0, "Could not send ignored region to MCer");
298 void AppSide::unignore_heap(void* address, std::size_t size) const
300 s_mc_message_ignore_memory_t message;
301 message.type = MessageType::UNIGNORE_HEAP;
302 message.addr = (std::uintptr_t)address;
304 xbt_assert(channel_.send(message) == 0, "Could not send IGNORE_HEAP message to model-checker");
307 void AppSide::declare_symbol(const char* name, int* value) const
309 s_mc_message_register_symbol_t message;
310 memset(&message, 0, sizeof(message));
311 message.type = MessageType::REGISTER_SYMBOL;
312 xbt_assert(strlen(name) + 1 <= message.name.size(), "Symbol is too long");
313 strncpy(message.name.data(), name, message.name.size());
314 message.callback = nullptr;
315 message.data = value;
316 xbt_assert(channel_.send(message) == 0, "Could send REGISTER_SYMBOL message to model-checker");
319 void AppSide::declare_stack(void* stack, size_t size, ucontext_t* context) const
321 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
323 s_stack_region_t region;
324 memset(®ion, 0, sizeof(region));
325 region.address = stack;
326 region.context = context;
328 region.block = ((char*)stack - (char*)heap->heapbase) / BLOCKSIZE + 1;
330 s_mc_message_stack_region_t message;
331 message.type = MessageType::STACK_REGION;
332 message.stack_region = region;
333 xbt_assert(channel_.send(message) == 0, "Could not send STACK_REGION to model-checker");
336 } // namespace simgrid