-/* Copyright (c) 2008-2018. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2008-2019. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
-#include <unistd.h>
-
-#include <cstring>
-#include <dirent.h>
-#include <fcntl.h>
-#include <link.h>
-
#ifndef WIN32
#include <sys/mman.h>
#endif
-#include "src/internal_config.h"
-#include "src/mc/mc_private.hpp"
-#include "src/smpi/include/private.hpp"
#include "xbt/file.hpp"
-#include "xbt/mmalloc.h"
-#include "xbt/module.h"
-
-#include "src/xbt/mmalloc/mmprivate.h"
-
-#include "src/simix/smx_private.hpp"
-
-#include <libelf.h>
-#include <libunwind.h>
-
-#include "src/mc/mc_private.hpp"
-#include <mc/mc.h>
#include "src/mc/mc_config.hpp"
#include "src/mc/mc_hash.hpp"
-#include "src/mc/mc_mmu.hpp"
+#include "src/mc/mc_private.hpp"
#include "src/mc/mc_smx.hpp"
-#include "src/mc/mc_unw.hpp"
-#include "src/mc/remote/mc_protocol.h"
#include "src/mc/sosp/mc_snapshot.hpp"
-#include "src/mc/Frame.hpp"
-#include "src/mc/ObjectInformation.hpp"
-#include "src/mc/Variable.hpp"
-#include "src/mc/sosp/RegionSnapshot.hpp"
-
using simgrid::mc::remote;
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc, "Logging specific to mc_checkpoint");
/************************************ Free functions **************************************/
/*****************************************************************************************/
-/** @brief Restore a region from a snapshot
- *
- * @param region Target region
- */
-static void restore(mc_mem_region_t region)
-{
- switch (region->storage_type()) {
- case simgrid::mc::StorageType::Flat:
- mc_model_checker->process().write_bytes(region->flat_data().get(), region->size(), region->permanent_address());
- break;
-
- case simgrid::mc::StorageType::Chunked:
- mc_region_restore_sparse(&mc_model_checker->process(), region);
- break;
-
- case simgrid::mc::StorageType::Privatized:
- for (auto& p : region->privatized_data())
- restore(&p);
- break;
-
- default: // includes StorageType::NoData
- xbt_die("Storage type not supported");
- break;
- }
-}
-
-#if HAVE_SMPI
-RegionSnapshot privatized_region(RegionType region_type, void* start_addr, void* permanent_addr, std::size_t size)
-{
- size_t process_count = MC_smpi_process_count();
-
- // Read smpi_privatization_regions from MCed:
- smpi_privatization_region_t remote_smpi_privatization_regions;
- mc_model_checker->process().read_variable("smpi_privatization_regions", &remote_smpi_privatization_regions,
- sizeof(remote_smpi_privatization_regions));
- s_smpi_privatization_region_t privatization_regions[process_count];
- mc_model_checker->process().read_bytes(&privatization_regions, sizeof(privatization_regions),
- remote(remote_smpi_privatization_regions));
-
- std::vector<simgrid::mc::RegionSnapshot> data;
- data.reserve(process_count);
- for (size_t i = 0; i < process_count; i++)
- data.push_back(simgrid::mc::region(region_type, start_addr, privatization_regions[i].address, size));
- simgrid::mc::RegionSnapshot region = simgrid::mc::RegionSnapshot(region_type, start_addr, permanent_addr, size);
- region.privatized_data(std::move(data));
- return region;
-}
-#endif
-
-static void add_region(int index, simgrid::mc::Snapshot* snapshot, simgrid::mc::RegionType type,
- simgrid::mc::ObjectInformation* object_info, void* start_addr, void* permanent_addr,
- std::size_t size)
-{
- if (type == simgrid::mc::RegionType::Data)
- xbt_assert(object_info, "Missing object info for object.");
- else if (type == simgrid::mc::RegionType::Heap)
- xbt_assert(not object_info, "Unexpected object info for heap region.");
-
- simgrid::mc::RegionSnapshot region;
-#if HAVE_SMPI
- const bool privatization_aware = object_info && mc_model_checker->process().privatized(*object_info);
- if (privatization_aware && MC_smpi_process_count())
- region = simgrid::mc::privatized_region(type, start_addr, permanent_addr, size);
- else
-#endif
- region = simgrid::mc::region(type, start_addr, permanent_addr, size);
-
- region.object_info(object_info);
- snapshot->snapshot_regions[index] =
- std::unique_ptr<simgrid::mc::RegionSnapshot>(new simgrid::mc::RegionSnapshot(std::move(region)));
-}
-
-static void get_memory_regions(simgrid::mc::RemoteClient* process, simgrid::mc::Snapshot* snapshot)
-{
- const size_t n = process->object_infos.size();
- snapshot->snapshot_regions.resize(n + 1);
- int i = 0;
- for (auto const& object_info : process->object_infos)
- add_region(i++, snapshot, simgrid::mc::RegionType::Data, object_info.get(), object_info->start_rw,
- object_info->start_rw, object_info->end_rw - object_info->start_rw);
- xbt_mheap_t heap = process->get_heap();
- void* start_heap = heap->base;
- void* end_heap = heap->breakval;
-
- add_region(n, snapshot, simgrid::mc::RegionType::Heap, nullptr, start_heap, start_heap,
- (char*)end_heap - (char*)start_heap);
- snapshot->heap_bytes_used = mmalloc_get_bytes_used_remote(heap->heaplimit, process->get_malloc_info());
-
-#if HAVE_SMPI
- if (mc_model_checker->process().privatized() && MC_smpi_process_count())
- // snapshot->privatization_index = smpi_loaded_page
- mc_model_checker->process().read_variable("smpi_loaded_page", &snapshot->privatization_index,
- sizeof(snapshot->privatization_index));
- else
-#endif
- snapshot->privatization_index = simgrid::mc::ProcessIndexMissing;
-}
-
-/** \brief Fills the position of the segments (executable, read-only, read/write).
+/** @brief Fills the position of the segments (executable, read-only, read/write).
* */
// TODO, use the ELF segment information for more robustness
void find_object_address(std::vector<simgrid::xbt::VmMap> const& maps, simgrid::mc::ObjectInformation* result)
xbt_assert(result->start_exec || result->start_rw || result->start_ro);
}
-/************************************* Take Snapshot ************************************/
-/****************************************************************************************/
-
-/** \brief Checks whether the variable is in scope for a given IP.
- *
- * A variable may be defined only from a given value of IP.
- *
- * \param var Variable description
- * \param scope Scope description
- * \param ip Instruction pointer
- * \return true if the variable is valid
- * */
-static bool valid_variable(simgrid::mc::Variable* var, simgrid::mc::Frame* scope, const void* ip)
-{
- // The variable is not yet valid:
- if (scope->range.begin() + var->start_scope > (std::uint64_t)ip)
- return false;
- else
- return true;
-}
-
-static void fill_local_variables_values(mc_stack_frame_t stack_frame, simgrid::mc::Frame* scope, int process_index,
- std::vector<s_local_variable_t>& result)
-{
- simgrid::mc::RemoteClient* process = &mc_model_checker->process();
-
- if (not scope || not scope->range.contain(stack_frame->ip))
- return;
-
- for (simgrid::mc::Variable& current_variable : scope->variables) {
-
- if (not valid_variable(¤t_variable, scope, (void*)stack_frame->ip))
- continue;
-
- int region_type;
- // FIXME, get rid of `region_type`
- if ((long)stack_frame->ip > (long)process->libsimgrid_info->start_exec)
- region_type = 1;
- else
- region_type = 2;
-
- s_local_variable_t new_var;
- new_var.subprogram = stack_frame->frame;
- new_var.ip = stack_frame->ip;
- new_var.name = current_variable.name;
- new_var.type = current_variable.type;
- new_var.region = region_type;
- new_var.address = nullptr;
-
- if (current_variable.address != nullptr)
- new_var.address = current_variable.address;
- else if (not current_variable.location_list.empty()) {
- simgrid::dwarf::Location location = simgrid::dwarf::resolve(
- current_variable.location_list, current_variable.object_info, &(stack_frame->unw_cursor),
- (void*)stack_frame->frame_base, &mc_model_checker->process(), process_index);
-
- if (not location.in_memory())
- xbt_die("Cannot handle non-address variable");
- new_var.address = location.address();
-
- } else
- xbt_die("No address");
-
- result.push_back(std::move(new_var));
- }
-
- // Recursive processing of nested scopes:
- for (simgrid::mc::Frame& nested_scope : scope->scopes)
- fill_local_variables_values(stack_frame, &nested_scope, process_index, result);
-}
-
-static std::vector<s_local_variable_t> get_local_variables_values(std::vector<s_mc_stack_frame_t>& stack_frames,
- int process_index)
-{
- std::vector<s_local_variable_t> variables;
- for (s_mc_stack_frame_t& stack_frame : stack_frames)
- fill_local_variables_values(&stack_frame, stack_frame.frame, process_index, variables);
- return variables;
-}
-
-static std::vector<s_mc_stack_frame_t> unwind_stack_frames(simgrid::mc::UnwindContext* stack_context)
-{
- simgrid::mc::RemoteClient* process = &mc_model_checker->process();
- std::vector<s_mc_stack_frame_t> result;
-
- unw_cursor_t c = stack_context->cursor();
-
- // TODO, check condition check (unw_init_local==0 means end of frame)
-
- while (1) {
-
- s_mc_stack_frame_t stack_frame;
-
- stack_frame.unw_cursor = c;
-
- unw_word_t ip;
- unw_word_t sp;
-
- unw_get_reg(&c, UNW_REG_IP, &ip);
- unw_get_reg(&c, UNW_REG_SP, &sp);
-
- stack_frame.ip = ip;
- stack_frame.sp = sp;
-
- // TODO, use real addresses in frame_t instead of fixing it here
-
- simgrid::mc::Frame* frame = process->find_function(remote(ip));
- stack_frame.frame = frame;
-
- if (frame) {
- stack_frame.frame_name = frame->name;
- stack_frame.frame_base = (unw_word_t)frame->frame_base(c);
- } else {
- stack_frame.frame_base = 0;
- stack_frame.frame_name = std::string();
- }
-
- result.push_back(std::move(stack_frame));
-
- /* Stop before context switch with maestro */
- if (frame != nullptr && frame->name == "smx_ctx_sysv_wrapper")
- break;
-
- int ret = unw_step(&c);
- if (ret == 0)
- xbt_die("Unexpected end of stack.");
- else if (ret < 0)
- xbt_die("Error while unwinding stack");
- }
-
- if (result.empty()) {
- XBT_INFO("unw_init_local failed");
- xbt_abort();
- }
-
- return result;
-}
-
-static std::vector<s_mc_snapshot_stack_t> take_snapshot_stacks(simgrid::mc::Snapshot* snapshot)
-{
- std::vector<s_mc_snapshot_stack_t> res;
-
- for (auto const& stack : mc_model_checker->process().stack_areas()) {
- s_mc_snapshot_stack_t st;
-
- // Read the context from remote process:
- unw_context_t context;
- mc_model_checker->process().read_bytes(&context, sizeof(context), remote(stack.context));
-
- st.context.initialize(&mc_model_checker->process(), &context);
-
- st.stack_frames = unwind_stack_frames(&st.context);
- st.local_variables = get_local_variables_values(st.stack_frames, stack.process_index);
- st.process_index = stack.process_index;
-
- unw_word_t sp = st.stack_frames[0].sp;
-
- res.push_back(std::move(st));
-
- size_t stack_size = (char*)stack.address + stack.size - (char*)sp;
- snapshot->stack_sizes.push_back(stack_size);
- }
-
- return res;
-}
-
-static void snapshot_handle_ignore(simgrid::mc::Snapshot* snapshot)
-{
- xbt_assert(snapshot->process());
-
- // Copy the memory:
- for (auto const& region : mc_model_checker->process().ignored_regions()) {
- s_mc_snapshot_ignored_data_t ignored_data;
- ignored_data.start = (void*)region.addr;
- ignored_data.data.resize(region.size);
- // TODO, we should do this once per privatization segment:
- snapshot->process()->read_bytes(ignored_data.data.data(), region.size, remote(region.addr),
- simgrid::mc::ProcessIndexDisabled);
- snapshot->ignored_data.push_back(std::move(ignored_data));
- }
-
- // Zero the memory:
- for (auto const& region : mc_model_checker->process().ignored_regions())
- snapshot->process()->clear_bytes(remote(region.addr), region.size);
-}
-
-static void snapshot_ignore_restore(simgrid::mc::Snapshot* snapshot)
-{
- for (auto const& ignored_data : snapshot->ignored_data)
- snapshot->process()->write_bytes(ignored_data.data.data(), ignored_data.data.size(), remote(ignored_data.start));
-}
-
-static std::vector<s_fd_infos_t> get_current_fds(pid_t pid)
-{
- const size_t fd_dir_path_size = 20;
- char fd_dir_path[fd_dir_path_size];
- int res = snprintf(fd_dir_path, fd_dir_path_size, "/proc/%lli/fd", (long long int)pid);
- xbt_assert(res >= 0);
- if ((size_t)res > fd_dir_path_size)
- xbt_die("Unexpected buffer is too small for fd_dir_path");
-
- DIR* fd_dir = opendir(fd_dir_path);
- if (fd_dir == nullptr)
- xbt_die("Cannot open directory '/proc/self/fd'\n");
-
- std::vector<s_fd_infos_t> fds;
-
- struct dirent* fd_number;
- while ((fd_number = readdir(fd_dir))) {
-
- int fd_value = xbt_str_parse_int(fd_number->d_name, "Found a non-numerical FD: %s. Freaking out!");
-
- if (fd_value < 3)
- continue;
-
- const size_t source_size = 25;
- char source[25];
- int res = snprintf(source, source_size, "/proc/%lli/fd/%s", (long long int)pid, fd_number->d_name);
- xbt_assert(res >= 0);
- if ((size_t)res > source_size)
- xbt_die("Unexpected buffer is too small for fd %s", fd_number->d_name);
-
- const size_t link_size = 200;
- char link[200];
- res = readlink(source, link, link_size);
-
- if (res < 0)
- xbt_die("Could not read link for %s", source);
- if (res == 200)
- xbt_die("Buffer to small for link of %s", source);
-
- link[res] = '\0';
-
-#if HAVE_SMPI
- if (smpi_is_privatization_file(link))
- continue;
-#endif
-
- // This is (probably) the DIR* we are reading:
- // TODO, read all the file entries at once and close the DIR.*
- if (strcmp(fd_dir_path, link) == 0)
- continue;
-
- // We don't handle them.
- // It does not mean we should silently ignore them however.
- if (strncmp(link, "pipe:", std::strlen("pipe:")) == 0 || strncmp(link, "socket:", std::strlen("socket:")) == 0)
- continue;
-
- // If dot_output enabled, do not handle the corresponding file
- if (dot_output != nullptr) {
- std::string link_basename = simgrid::xbt::Path(link).get_base_name();
- if (link_basename == _sg_mc_dot_output_file.get())
- continue;
- }
-
- // This is probably a shared memory used by lttng-ust:
- if (strncmp("/dev/shm/ust-shm-tmp-", link, std::strlen("/dev/shm/ust-shm-tmp-")) == 0)
- continue;
-
- // Add an entry for this FD in the snapshot:
- s_fd_infos_t fd;
- fd.filename = std::string(link);
- fd.number = fd_value;
- fd.flags = fcntl(fd_value, F_GETFL) | fcntl(fd_value, F_GETFD);
- fd.current_position = lseek(fd_value, 0, SEEK_CUR);
- fds.push_back(std::move(fd));
- }
-
- closedir(fd_dir);
- return fds;
-}
-
-std::shared_ptr<simgrid::mc::Snapshot> take_snapshot(int num_state)
-{
- XBT_DEBUG("Taking snapshot %i", num_state);
-
- simgrid::mc::RemoteClient* mc_process = &mc_model_checker->process();
-
- std::shared_ptr<simgrid::mc::Snapshot> snapshot = std::make_shared<simgrid::mc::Snapshot>(mc_process, num_state);
-
- for (auto const& p : mc_model_checker->process().actors())
- snapshot->enabled_processes.insert(p.copy.getBuffer()->pid_);
-
- snapshot_handle_ignore(snapshot.get());
-
- if (_sg_mc_snapshot_fds)
- snapshot->current_fds = get_current_fds(mc_model_checker->process().pid());
-
- /* Save the std heap and the writable mapped pages of libsimgrid and binary */
- get_memory_regions(mc_process, snapshot.get());
-
- snapshot->to_ignore = mc_model_checker->process().ignored_heap();
-
- if (_sg_mc_max_visited_states > 0 || not _sg_mc_property_file.get().empty()) {
- snapshot->stacks = take_snapshot_stacks(snapshot.get());
- if (_sg_mc_hash)
- snapshot->hash = simgrid::mc::hash(*snapshot);
- else
- snapshot->hash = 0;
- } else
- snapshot->hash = 0;
-
- snapshot_ignore_restore(snapshot.get());
- return snapshot;
-}
-
-static inline void restore_snapshot_regions(simgrid::mc::Snapshot* snapshot)
-{
- for (std::unique_ptr<s_mc_mem_region_t> const& region : snapshot->snapshot_regions) {
- // For privatized, variables we decided it was not necessary to take the snapshot:
- if (region)
- restore(region.get());
- }
-
-#if HAVE_SMPI
- if (snapshot->privatization_index >= 0) {
- // Fix the privatization mmap:
- s_mc_message_restore_t message{MC_MESSAGE_RESTORE, snapshot->privatization_index};
- mc_model_checker->process().getChannel().send(message);
- }
-#endif
-}
-
-static inline void restore_snapshot_fds(simgrid::mc::Snapshot* snapshot)
-{
- xbt_die("FD snapshot not implemented in client/server mode.");
-
- for (auto const& fd : snapshot->current_fds) {
-
- int new_fd = open(fd.filename.c_str(), fd.flags);
- if (new_fd < 0)
- xbt_die("Could not reopen the file %s fo restoring the file descriptor", fd.filename.c_str());
- if (new_fd != fd.number) {
- dup2(new_fd, fd.number);
- close(new_fd);
- }
- lseek(fd.number, fd.current_position, SEEK_SET);
- }
-}
-
-void restore_snapshot(std::shared_ptr<simgrid::mc::Snapshot> snapshot)
-{
- XBT_DEBUG("Restore snapshot %i", snapshot->num_state);
- restore_snapshot_regions(snapshot.get());
- if (_sg_mc_snapshot_fds)
- restore_snapshot_fds(snapshot.get());
- snapshot_ignore_restore(snapshot.get());
- mc_model_checker->process().clear_cache();
-}
-
} // namespace mc
} // namespace simgrid
