X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/a4d071afeab4b3ff0a50eefbf48a391d4e8978aa..c196d5468b9bf03da04bfdd45bb5f80b8d071b63:/src/mc/mc_checkpoint.cpp diff --git a/src/mc/mc_checkpoint.cpp b/src/mc/mc_checkpoint.cpp index 5788d9c0b3..485a5e3d47 100644 --- a/src/mc/mc_checkpoint.cpp +++ b/src/mc/mc_checkpoint.cpp @@ -15,6 +15,7 @@ #include "src/mc/mc_private.h" #include "xbt/module.h" #include +#include #include "src/smpi/private.h" #include "src/xbt/mmalloc/mmprivate.h" @@ -41,13 +42,9 @@ using simgrid::mc::remote; -extern "C" { - XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc, "Logging specific to mc_checkpoint"); -} - namespace simgrid { namespace mc { @@ -118,7 +115,7 @@ RegionSnapshot privatized_region( #endif static -void add_region(int index, mc_snapshot_t snapshot, +void add_region(int index, simgrid::mc::Snapshot* snapshot, simgrid::mc::RegionType type, simgrid::mc::ObjectInformation* object_info, void *start_addr, void* permanent_addr, @@ -151,7 +148,7 @@ void add_region(int index, mc_snapshot_t snapshot, return; } -static void get_memory_regions(simgrid::mc::Process* process, mc_snapshot_t snapshot) +static void get_memory_regions(simgrid::mc::Process* process, simgrid::mc::Snapshot* snapshot) { const size_t n = process->object_infos.size(); snapshot->snapshot_regions.resize(n + 1); @@ -184,39 +181,66 @@ static void get_memory_regions(simgrid::mc::Process* process, mc_snapshot_t snap snapshot->privatization_index = simgrid::mc::ProcessIndexMissing; } +#define PROT_RWX (PROT_READ | PROT_WRITE | PROT_EXEC) +#define PROT_RW (PROT_READ | PROT_WRITE) +#define PROT_RX (PROT_READ | PROT_EXEC) + /** \brief Fills the position of the segments (executable, read-only, read/write). - * - * `dl_iterate_phdr` would be more robust but would not work in cross-process. * */ +// TODO, use the ELF segment information for more robustness void find_object_address( std::vector const& maps, simgrid::mc::ObjectInformation* result) { - char* file_name = xbt_strdup(result->file_name.c_str()); - const char *name = xbt_basename(file_name); + char* name = xbt_basename(result->file_name.c_str()); + for (size_t i = 0; i < maps.size(); ++i) { simgrid::xbt::VmMap const& reg = maps[i]; - if (maps[i].pathname.empty() - || strcmp(xbt_basename(maps[i].pathname.c_str()), name)) { - // Nothing to do - } else if ((reg.prot & PROT_WRITE)) { + if (maps[i].pathname.empty()) + continue; + char* map_basename = xbt_basename(maps[i].pathname.c_str()); + if (strcmp(name, map_basename) != 0) { + free(map_basename); + continue; + } + free(map_basename); + + // This is the non-GNU_RELRO-part of the data segment: + if (reg.prot == PROT_RW) { xbt_assert(!result->start_rw, "Multiple read-write segments for %s, not supported", maps[i].pathname.c_str()); result->start_rw = (char*) reg.start_addr; result->end_rw = (char*) reg.end_addr; - // .bss is usually after the .data: - simgrid::xbt::VmMap const& next = maps[i + 1]; - if (next.pathname.empty() && (next.prot & PROT_WRITE) - && next.start_addr == reg.end_addr) + + // The next VMA might be end of the data segment: + if (i + 1 < maps.size() + && maps[i + 1].pathname.empty() + && maps[i + 1].prot == PROT_RW + && maps[i + 1].start_addr == reg.end_addr) result->end_rw = (char*) maps[i + 1].end_addr; - } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)) { + } + + // This is the text segment: + else if (reg.prot == PROT_RX) { xbt_assert(!result->start_exec, "Multiple executable segments for %s, not supported", maps[i].pathname.c_str()); result->start_exec = (char*) reg.start_addr; result->end_exec = (char*) reg.end_addr; - } else if ((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) { + + // The next VMA might be end of the data segment: + if (i + 1 < maps.size() + && maps[i + 1].pathname.empty() + && maps[i + 1].prot == PROT_RW + && maps[i + 1].start_addr == reg.end_addr) { + result->start_rw = (char*) maps[i + 1].start_addr; + result->end_rw = (char*) maps[i + 1].end_addr; + } + } + + // This is the GNU_RELRO-part of the data segment: + else if (reg.prot == PROT_READ) { xbt_assert(!result->start_ro, "Multiple read only segments for %s, not supported", maps[i].pathname.c_str()); @@ -237,9 +261,9 @@ void find_object_address( if (result->end_exec && (const void*) result->end_exec > result->end) result->end = result->end_exec; - xbt_assert(result->start_rw); - xbt_assert(result->start_exec); - free(file_name); + xbt_assert(result->start_exec || result->start_rw || result->start_ro); + + free(name); } /************************************* Take Snapshot ************************************/ @@ -332,16 +356,14 @@ static std::vector get_local_variables_values( return std::move(variables); } -static std::vector unwind_stack_frames(mc_unw_context_t stack_context) +static std::vector unwind_stack_frames(simgrid::mc::UnwindContext* stack_context) { simgrid::mc::Process* process = &mc_model_checker->process(); std::vector result; - unw_cursor_t c; + unw_cursor_t c = stack_context->cursor(); // TODO, check condition check (unw_init_local==0 means end of frame) - if (mc_unw_init_cursor(&c, stack_context) != 0) - xbt_die("Could not initialize stack unwinding"); while (1) { @@ -393,7 +415,7 @@ static std::vector unwind_stack_frames(mc_unw_context_t stac return std::move(result); }; -static std::vector take_snapshot_stacks(mc_snapshot_t * snapshot) +static std::vector take_snapshot_stacks(simgrid::mc::Snapshot* * snapshot) { std::vector res; @@ -405,9 +427,7 @@ static std::vector take_snapshot_stacks(mc_snapshot_t * s mc_model_checker->process().read_bytes( &context, sizeof(context), remote(stack.context)); - if (mc_unw_init_context(&st.context, &mc_model_checker->process(), - &context) < 0) - xbt_die("Could not initialise the libunwind 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); @@ -426,7 +446,7 @@ static std::vector take_snapshot_stacks(mc_snapshot_t * s } -static void snapshot_handle_ignore(mc_snapshot_t snapshot) +static void snapshot_handle_ignore(simgrid::mc::Snapshot* snapshot) { xbt_assert(snapshot->process()); @@ -448,7 +468,7 @@ static void snapshot_handle_ignore(mc_snapshot_t snapshot) } -static void snapshot_ignore_restore(mc_snapshot_t snapshot) +static void snapshot_ignore_restore(simgrid::mc::Snapshot* snapshot) { for (auto const& ignored_data : snapshot->ignored_data) snapshot->process()->write_bytes( @@ -515,8 +535,14 @@ static std::vector get_current_fds(pid_t pid) continue; // If dot_output enabled, do not handle the corresponding file - if (dot_output != nullptr && strcmp(xbt_basename(link), _sg_mc_dot_output_file) == 0) - continue; + if (dot_output != nullptr) { + char* link_basename = xbt_basename(link); + if (strcmp(link_basename, _sg_mc_dot_output_file) == 0) { + free(link_basename); + continue; + } + free(link_basename); + } // This is probably a shared memory used by lttng-ust: if(strncmp("/dev/shm/ust-shm-tmp-", link, 21)==0) @@ -535,13 +561,13 @@ static std::vector get_current_fds(pid_t pid) return std::move(fds); } -mc_snapshot_t take_snapshot(int num_state) +simgrid::mc::Snapshot* take_snapshot(int num_state) { XBT_DEBUG("Taking snapshot %i", num_state); simgrid::mc::Process* mc_process = &mc_model_checker->process(); - mc_snapshot_t snapshot = new simgrid::mc::Snapshot(mc_process); + simgrid::mc::Snapshot* snapshot = new simgrid::mc::Snapshot(mc_process); snapshot->num_state = num_state; @@ -579,7 +605,7 @@ mc_snapshot_t take_snapshot(int num_state) } static inline -void restore_snapshot_regions(mc_snapshot_t snapshot) +void restore_snapshot_regions(simgrid::mc::Snapshot* snapshot) { for(std::unique_ptr const& region : snapshot->snapshot_regions) { // For privatized, variables we decided it was not necessary to take the snapshot: @@ -594,13 +620,13 @@ void restore_snapshot_regions(mc_snapshot_t snapshot) s_mc_restore_message message; message.type = MC_MESSAGE_RESTORE; message.index = snapshot->privatization_index; - mc_model_checker->process().send_message(message); + mc_model_checker->process().getChannel().send(message); } #endif } static inline -void restore_snapshot_fds(mc_snapshot_t snapshot) +void restore_snapshot_fds(simgrid::mc::Snapshot* snapshot) { if (mc_mode == MC_MODE_SERVER) xbt_die("FD snapshot not implemented in client/server mode."); @@ -619,7 +645,7 @@ void restore_snapshot_fds(mc_snapshot_t snapshot) } } -void restore_snapshot(mc_snapshot_t snapshot) +void restore_snapshot(simgrid::mc::Snapshot* snapshot) { XBT_DEBUG("Restore snapshot %i", snapshot->num_state); const bool use_soft_dirty = _sg_mc_sparse_checkpoint && _sg_mc_soft_dirty; @@ -629,7 +655,7 @@ void restore_snapshot(mc_snapshot_t snapshot) if (use_soft_dirty) mc_model_checker->process().reset_soft_dirty(); snapshot_ignore_restore(snapshot); - mc_model_checker->process().cache_flags = 0; + mc_model_checker->process().clear_cache(); if (use_soft_dirty) mc_model_checker->parent_snapshot_ = snapshot; }