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/mc_base.hpp"
11 #include "src/mc/remote/RemoteProcess.hpp"
13 #include "src/smpi/include/private.hpp"
15 #include "xbt/coverage.h"
17 #include "xbt/xbt_modinter.h" /* mmalloc_preinit to get the default mmalloc arena address */
18 #include <simgrid/modelchecker.h>
24 #include <sys/ptrace.h>
25 #include <sys/socket.h>
26 #include <sys/types.h>
28 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_client, mc, "MC client logic");
33 std::unique_ptr<AppSide> AppSide::instance_;
35 AppSide* AppSide::initialize()
37 if (not std::getenv(MC_ENV_SOCKET_FD)) // We are not in MC mode: don't initialize the MC world
40 // Do not break if we are called multiple times:
42 return instance_.get();
44 _sg_do_model_check = 1;
46 // Fetch socket from MC_ENV_SOCKET_FD:
47 const char* fd_env = std::getenv(MC_ENV_SOCKET_FD);
48 int fd = xbt_str_parse_int(fd_env, "Variable '" MC_ENV_SOCKET_FD "' should contain a number but contains '%s'");
49 XBT_DEBUG("Model-checked application found socket FD %i", fd);
51 // Check the socket type/validity:
53 socklen_t socklen = sizeof(type);
54 xbt_assert(getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &socklen) == 0, "Could not check socket type");
55 xbt_assert(type == SOCK_SEQPACKET, "Unexpected socket type %i", type);
56 XBT_DEBUG("Model-checked application found expected socket type");
58 instance_ = std::make_unique<simgrid::mc::AppSide>(fd);
60 // Wait for the model-checker:
63 ptrace(PTRACE_TRACEME, 0, nullptr, nullptr);
65 ptrace(PT_TRACE_ME, 0, nullptr, 0);
67 #error "no ptrace equivalent coded for this platform"
69 xbt_assert(errno == 0 && raise(SIGSTOP) == 0, "Could not wait for the model-checker (errno = %d: %s)", errno,
72 s_mc_message_initial_addresses_t message{
73 MessageType::INITIAL_ADDRESSES, mmalloc_preinit(), simgrid::kernel::actor::get_maxpid_addr(),
74 simgrid::simix::simix_global_get_actors_addr(), simgrid::simix::simix_global_get_dead_actors_addr()};
75 xbt_assert(instance_->channel_.send(message) == 0, "Could not send the initial message with addresses.");
77 instance_->handle_messages();
78 return instance_.get();
81 void AppSide::handle_deadlock_check(const s_mc_message_t*) const
83 bool deadlock = false;
84 if (not simix_global->process_list.empty()) {
86 for (auto const& kv : simix_global->process_list)
87 if (simgrid::mc::actor_is_enabled(kv.second)) {
94 s_mc_message_int_t answer{MessageType::DEADLOCK_CHECK_REPLY, deadlock};
95 xbt_assert(channel_.send(answer) == 0, "Could not send response");
97 void AppSide::handle_simcall_execute(const s_mc_message_simcall_handle_t* message) const
99 kernel::actor::ActorImpl* process = kernel::actor::ActorImpl::by_pid(message->aid_);
100 xbt_assert(process != nullptr, "Invalid pid %ld", message->aid_);
101 process->simcall_handle(message->times_considered_);
102 xbt_assert(channel_.send(MessageType::WAITING) == 0, "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
118 while (true) { // Until we get a CONTINUE message
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);
137 case MessageType::SIMCALL_HANDLE:
138 assert_msg_size("SIMCALL_HANDLE", s_mc_message_simcall_handle_t);
139 handle_simcall_execute((s_mc_message_simcall_handle_t*)message_buffer.data());
142 case MessageType::SIMCALL_IS_VISIBLE: {
143 assert_msg_size("SIMCALL_IS_VISIBLE", s_mc_message_simcall_is_visible_t);
144 auto msg_simcall = (s_mc_message_simcall_is_visible_t*)message_buffer.data();
145 const kernel::actor::ActorImpl* actor = kernel::actor::ActorImpl::by_pid(msg_simcall->aid);
146 xbt_assert(actor != nullptr, "Invalid pid %ld", msg_simcall->aid);
147 xbt_assert(actor->simcall_.observer_, "The transition of %s has no observer", actor->get_cname());
148 bool value = actor->simcall_.observer_->is_visible();
151 s_mc_message_simcall_is_visible_answer_t answer{MessageType::SIMCALL_IS_VISIBLE_ANSWER, value};
152 xbt_assert(channel_.send(answer) == 0, "Could not send response");
156 case MessageType::SIMCALL_TO_STRING: {
157 assert_msg_size("SIMCALL_TO_STRING", s_mc_message_simcall_to_string_t);
158 auto msg_simcall = (s_mc_message_simcall_to_string_t*)message_buffer.data();
159 const kernel::actor::ActorImpl* actor = kernel::actor::ActorImpl::by_pid(msg_simcall->aid);
160 xbt_assert(actor != nullptr, "Invalid pid %ld", msg_simcall->aid);
161 xbt_assert(actor->simcall_.observer_, "The transition of %s has no observer", actor->get_cname());
162 std::string value = actor->simcall_.observer_->to_string(msg_simcall->time_considered);
165 s_mc_message_simcall_to_string_answer_t answer{MessageType::SIMCALL_TO_STRING_ANSWER, {0}};
166 value.copy(answer.value, (sizeof answer.value) - 1); // last byte was set to '\0' by initialization above
167 xbt_assert(channel_.send(answer) == 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 %ld", 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 xbt_assert(channel_.send(answer) == 0, "Could not send response");
186 case MessageType::ACTOR_ENABLED:
187 assert_msg_size("ACTOR_ENABLED", s_mc_message_actor_enabled_t);
188 handle_actor_enabled((s_mc_message_actor_enabled_t*)message_buffer.data());
191 case MessageType::FINALIZE: {
192 assert_msg_size("FINALIZE", s_mc_message_int_t);
193 bool terminate_asap = ((s_mc_message_int_t*)message_buffer.data())->value;
194 XBT_DEBUG("Finalize (terminate = %d)", (int)terminate_asap);
195 if (not terminate_asap) {
196 if (XBT_LOG_ISENABLED(mc_client, xbt_log_priority_debug))
197 simix_global->display_all_actor_status();
199 XBT_DEBUG("Smpi_enabled: %d", (int)smpi_enabled());
204 coverage_checkpoint();
205 xbt_assert(channel_.send(MessageType::DEADLOCK_CHECK_REPLY) == 0, // DEADLOCK_CHECK_REPLY, really?
206 "Could not answer to FINALIZE");
214 xbt_die("Received unexpected message %s (%i)", to_c_str(message->type), static_cast<int>(message->type));
220 void AppSide::main_loop() const
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 s_mc_message_ignore_memory_t message;
239 message.type = MessageType::IGNORE_MEMORY;
240 message.addr = (std::uintptr_t)addr;
242 xbt_assert(channel_.send(message) == 0, "Could not send IGNORE_MEMORY message to model-checker");
245 void AppSide::ignore_heap(void* address, std::size_t size) const
247 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
249 s_mc_message_ignore_heap_t message;
250 message.type = MessageType::IGNORE_HEAP;
251 message.address = address;
253 message.block = ((char*)address - (char*)heap->heapbase) / BLOCKSIZE + 1;
254 if (heap->heapinfo[message.block].type == 0) {
255 message.fragment = -1;
256 heap->heapinfo[message.block].busy_block.ignore++;
258 message.fragment = (ADDR2UINT(address) % BLOCKSIZE) >> heap->heapinfo[message.block].type;
259 heap->heapinfo[message.block].busy_frag.ignore[message.fragment]++;
262 xbt_assert(channel_.send(message) == 0, "Could not send ignored region to MCer");
265 void AppSide::unignore_heap(void* address, std::size_t size) const
267 s_mc_message_ignore_memory_t message;
268 message.type = MessageType::UNIGNORE_HEAP;
269 message.addr = (std::uintptr_t)address;
271 xbt_assert(channel_.send(message) == 0, "Could not send IGNORE_HEAP message to model-checker");
274 void AppSide::declare_symbol(const char* name, int* value) const
276 s_mc_message_register_symbol_t message;
277 message.type = MessageType::REGISTER_SYMBOL;
278 xbt_assert(strlen(name) + 1 <= message.name.size(), "Symbol is too long");
279 strncpy(message.name.data(), name, message.name.size());
280 message.callback = nullptr;
281 message.data = value;
282 xbt_assert(channel_.send(message) == 0, "Could send REGISTER_SYMBOL message to model-checker");
285 void AppSide::declare_stack(void* stack, size_t size, ucontext_t* context) const
287 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
289 s_stack_region_t region;
290 memset(®ion, 0, sizeof(region));
291 region.address = stack;
292 region.context = context;
294 region.block = ((char*)stack - (char*)heap->heapbase) / BLOCKSIZE + 1;
296 s_mc_message_stack_region_t message;
297 message.type = MessageType::STACK_REGION;
298 message.stack_region = region;
299 xbt_assert(channel_.send(message) == 0, "Could not send STACK_REGION to model-checker");
302 } // namespace simgrid