1 /* Copyright (c) 2015-2020. 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 <simgrid/modelchecker.h>
14 #include <sys/ptrace.h>
15 #include <sys/socket.h>
16 #include <sys/types.h>
18 // We won't need those once the separation MCer/MCed is complete:
19 #include "src/mc/mc_smx.hpp"
21 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_client, mc, "MC client logic");
26 std::unique_ptr<AppSide> AppSide::instance_;
28 AppSide* AppSide::initialize()
30 if (not std::getenv(MC_ENV_SOCKET_FD)) // We are not in MC mode: don't initialize the MC world
33 // Do not break if we are called multiple times:
35 return instance_.get();
37 _sg_do_model_check = 1;
39 // Fetch socket from MC_ENV_SOCKET_FD:
40 const char* fd_env = std::getenv(MC_ENV_SOCKET_FD);
41 int fd = xbt_str_parse_int(fd_env, "Variable '" MC_ENV_SOCKET_FD "' should contain a number but contains '%s'");
42 XBT_DEBUG("Model-checked application found socket FD %i", fd);
44 // Check the socket type/validity:
46 socklen_t socklen = sizeof(type);
47 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &socklen) != 0)
48 xbt_die("Could not check socket type");
49 xbt_assert(type == SOCK_SEQPACKET, "Unexpected socket type %i", type);
50 XBT_DEBUG("Model-checked application found expected socket type");
52 instance_ = std::make_unique<simgrid::mc::AppSide>(fd);
54 // Wait for the model-checker:
57 ptrace(PTRACE_TRACEME, 0, nullptr, nullptr);
59 ptrace(PT_TRACE_ME, 0, nullptr, 0);
61 #error "no ptrace equivalent coded for this platform"
63 if (errno != 0 || raise(SIGSTOP) != 0)
64 xbt_die("Could not wait for the model-checker (errno = %d: %s)", errno, strerror(errno));
66 instance_->handle_messages();
67 return instance_.get();
70 void AppSide::handle_deadlock_check(const s_mc_message_t*) const
72 bool deadlock = false;
73 if (not simix_global->process_list.empty()) {
75 for (auto const& kv : simix_global->process_list)
76 if (simgrid::mc::actor_is_enabled(kv.second)) {
83 s_mc_message_int_t answer{MessageType::DEADLOCK_CHECK_REPLY, deadlock};
84 xbt_assert(channel_.send(answer) == 0, "Could not send response");
86 void AppSide::handle_continue(const s_mc_message_t*) const
90 void AppSide::handle_simcall(const s_mc_message_simcall_handle_t* message) const
92 smx_actor_t process = SIMIX_process_from_PID(message->pid);
93 xbt_assert(process != nullptr, "Invalid pid %lu", message->pid);
94 process->simcall_handle(message->value);
95 if (channel_.send(MessageType::WAITING))
96 xbt_die("Could not send MESSAGE_WAITING to model-checker");
99 void AppSide::handle_actor_enabled(const s_mc_message_actor_enabled_t* msg) const
101 bool res = simgrid::mc::actor_is_enabled(SIMIX_process_from_PID(msg->aid));
102 s_mc_message_int_t answer{MessageType::ACTOR_ENABLED_REPLY, res};
103 channel_.send(answer);
106 #define assert_msg_size(_name_, _type_) \
107 xbt_assert(received_size == sizeof(_type_), "Unexpected size for " _name_ " (%zd != %zu)", received_size, \
110 void AppSide::handle_messages() const
113 XBT_DEBUG("Waiting messages from model-checker");
115 std::array<char, MC_MESSAGE_LENGTH> message_buffer;
116 ssize_t received_size = channel_.receive(message_buffer.data(), message_buffer.size());
118 xbt_assert(received_size >= 0, "Could not receive commands from the model-checker");
120 const s_mc_message_t* message = (s_mc_message_t*)message_buffer.data();
121 switch (message->type) {
122 case MessageType::DEADLOCK_CHECK:
123 assert_msg_size("DEADLOCK_CHECK", s_mc_message_t);
124 handle_deadlock_check(message);
127 case MessageType::CONTINUE:
128 assert_msg_size("MESSAGE_CONTINUE", s_mc_message_t);
129 handle_continue(message);
132 case MessageType::SIMCALL_HANDLE:
133 assert_msg_size("SIMCALL_HANDLE", s_mc_message_simcall_handle_t);
134 handle_simcall((s_mc_message_simcall_handle_t*)message_buffer.data());
137 case MessageType::ACTOR_ENABLED:
138 assert_msg_size("ACTOR_ENABLED", s_mc_message_actor_enabled_t);
139 handle_actor_enabled((s_mc_message_actor_enabled_t*)message_buffer.data());
143 xbt_die("Received unexpected message %s (%i)", MC_message_type_name(message->type),
144 static_cast<int>(message->type));
150 void AppSide::main_loop() const
153 simgrid::mc::wait_for_requests();
154 xbt_assert(channel_.send(MessageType::WAITING) == 0, "Could not send WAITING message to model-checker");
155 this->handle_messages();
159 void AppSide::report_assertion_failure() const
161 if (channel_.send(MessageType::ASSERTION_FAILED))
162 xbt_die("Could not send assertion to model-checker");
163 this->handle_messages();
166 void AppSide::ignore_memory(void* addr, std::size_t size) const
168 s_mc_message_ignore_memory_t message;
169 message.type = MessageType::IGNORE_MEMORY;
170 message.addr = (std::uintptr_t)addr;
172 if (channel_.send(message))
173 xbt_die("Could not send IGNORE_MEMORY message to model-checker");
176 void AppSide::ignore_heap(void* address, std::size_t size) const
178 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
180 s_mc_message_ignore_heap_t message;
181 message.type = MessageType::IGNORE_HEAP;
182 message.address = address;
184 message.block = ((char*)address - (char*)heap->heapbase) / BLOCKSIZE + 1;
185 if (heap->heapinfo[message.block].type == 0) {
186 message.fragment = -1;
187 heap->heapinfo[message.block].busy_block.ignore++;
189 message.fragment = (ADDR2UINT(address) % BLOCKSIZE) >> heap->heapinfo[message.block].type;
190 heap->heapinfo[message.block].busy_frag.ignore[message.fragment]++;
193 if (channel_.send(message))
194 xbt_die("Could not send ignored region to MCer");
197 void AppSide::unignore_heap(void* address, std::size_t size) const
199 s_mc_message_ignore_memory_t message;
200 message.type = MessageType::UNIGNORE_HEAP;
201 message.addr = (std::uintptr_t)address;
203 if (channel_.send(message))
204 xbt_die("Could not send IGNORE_HEAP message to model-checker");
207 void AppSide::declare_symbol(const char* name, int* value) const
209 s_mc_message_register_symbol_t message;
210 message.type = MessageType::REGISTER_SYMBOL;
211 if (strlen(name) + 1 > sizeof(message.name))
212 xbt_die("Symbol is too long");
213 strncpy(message.name, name, sizeof(message.name));
214 message.callback = nullptr;
215 message.data = value;
216 if (channel_.send(message))
217 xbt_die("Could send REGISTER_SYMBOL message to model-checker");
220 void AppSide::declare_stack(void* stack, size_t size, ucontext_t* context) const
222 const s_xbt_mheap_t* heap = mmalloc_get_current_heap();
224 s_stack_region_t region;
225 memset(®ion, 0, sizeof(region));
226 region.address = stack;
227 region.context = context;
229 region.block = ((char*)stack - (char*)heap->heapbase) / BLOCKSIZE + 1;
231 s_mc_message_stack_region_t message;
232 message.type = MessageType::STACK_REGION;
233 message.stack_region = region;
234 if (channel_.send(message))
235 xbt_die("Could not send STACK_REGION to model-checker");
238 } // namespace simgrid