X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/ae54134baee4ae2fa16a9c49cdb9daa646a3c569..bfc956026c22595af39ca5c73b7e250e16d85aea:/src/mc/mc_checkpoint.c diff --git a/src/mc/mc_checkpoint.c b/src/mc/mc_checkpoint.c index 0703b1744c..244982166c 100644 --- a/src/mc/mc_checkpoint.c +++ b/src/mc/mc_checkpoint.c @@ -1,616 +1,694 @@ -/* Copyright (c) 2008-2012 Da SimGrid Team. All rights reserved. */ +/* Copyright (c) 2008-2014. 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 +#define _GNU_SOURCE +#define UNW_LOCAL_ONLY + + +#include +#include + +#include "internal_config.h" #include "mc_private.h" #include "xbt/module.h" +#include +#include "../smpi/private.h" +#include + +#include "xbt/mmalloc/mmprivate.h" #include "../simix/smx_private.h" #include +#include + +#include "mc_private.h" +#include + +#include "mc_mmu.h" XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc, "Logging specific to mc_checkpoint"); -void *start_text_libsimgrid; -void *start_plt_libsimgrid, *end_plt_libsimgrid; -void *start_plt_binary, *end_plt_binary; char *libsimgrid_path; -void *start_data_libsimgrid; -void *start_text_binary; -void *end_raw_heap; - -static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size); -static void MC_region_restore(mc_mem_region_t reg); -static void MC_region_destroy(mc_mem_region_t reg); - -static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size); -static void add_value(xbt_dynar_t *list, const char *type, unsigned long int val); -static xbt_dynar_t take_snapshot_stacks(void *heap); -static xbt_strbuff_t get_local_variables_values(void *stack_context, void *heap); -static void print_local_variables_values(xbt_dynar_t all_variables); -static void *get_stack_pointer(void *stack_context, void *heap); +/************************************ Free functions **************************************/ +/*****************************************************************************************/ -static void snapshot_stack_free(mc_snapshot_stack_t s); +static void MC_snapshot_stack_free(mc_snapshot_stack_t s) +{ + if (s) { + xbt_dynar_free(&(s->local_variables)); + xbt_dynar_free(&(s->stack_frames)); + xbt_free(s); + } +} -static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size) +static void MC_snapshot_stack_free_voidp(void *s) { - mc_mem_region_t new_reg = xbt_new0(s_mc_mem_region_t, 1); - new_reg->type = type; - new_reg->start_addr = start_addr; - new_reg->size = size; - new_reg->data = xbt_malloc0(size); - memcpy(new_reg->data, start_addr, size); + MC_snapshot_stack_free((mc_snapshot_stack_t) * (void **) s); +} - XBT_DEBUG("New region : type : %d, data : %p, size : %zu", type, new_reg->data, size); - - return new_reg; +static void local_variable_free(local_variable_t v) +{ + xbt_free(v->name); + xbt_free(v); } -static void MC_region_restore(mc_mem_region_t reg) +static void local_variable_free_voidp(void *v) { - /*FIXME: check if start_addr is still mapped, if it is not, then map it - before copying the data */ - - memcpy(reg->start_addr, reg->data, reg->size); - - return; + local_variable_free((local_variable_t) * (void **) v); } -static void MC_region_destroy(mc_mem_region_t reg) +void MC_region_destroy(mc_mem_region_t reg) { + if (!reg) + return; + + //munmap(reg->data, reg->size); xbt_free(reg->data); + if (reg->page_numbers) { + mc_free_page_snapshot_region(reg->page_numbers, mc_page_count(reg->size)); + } xbt_free(reg); } -static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size) +void MC_free_snapshot(mc_snapshot_t snapshot) { - mc_mem_region_t new_reg = MC_region_new(type, start_addr, size); - snapshot->regions = xbt_realloc(snapshot->regions, (snapshot->num_reg + 1) * sizeof(mc_mem_region_t)); - snapshot->regions[snapshot->num_reg] = new_reg; - snapshot->num_reg++; - return; -} + unsigned int i; + for (i = 0; i < NB_REGIONS; i++) { + MC_region_destroy(snapshot->regions[i]); + } -void MC_take_snapshot(mc_snapshot_t snapshot) -{ - unsigned int i = 0; - s_map_region_t reg; - memory_map_t maps = get_memory_map(); + xbt_free(snapshot->stack_sizes); + xbt_dynar_free(&(snapshot->stacks)); + xbt_dynar_free(&(snapshot->to_ignore)); + xbt_dynar_free(&snapshot->ignored_data); - /* Save the std heap and the writable mapped pages of libsimgrid */ - while (i < maps->mapsize) { - reg = maps->regions[i]; - if ((reg.prot & PROT_WRITE)){ - if (maps->regions[i].pathname == NULL){ - if (reg.start_addr == std_heap){ // only save the std heap (and not the raw one) - MC_snapshot_add_region(snapshot, 0, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr); - } - i++; - } else { - if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){ - MC_snapshot_add_region(snapshot, 1, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr); - i++; - reg = maps->regions[i]; - while(reg.pathname == NULL && (reg.prot & PROT_WRITE) && i < maps->mapsize){ - MC_snapshot_add_region(snapshot, 1, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr); - i++; - reg = maps->regions[i]; - } - }else{ - i++; - } - } - }else{ - i++; + if (snapshot->privatization_regions) { + size_t n = xbt_dynar_length(snapshot->enabled_processes); + for (i = 0; i != n; ++i) { + MC_region_destroy(snapshot->privatization_regions[i]); } + xbt_free(snapshot->privatization_regions); } - free_memory_map(maps); + xbt_free(snapshot); } -void MC_init_memory_map_info(){ +/******************************* Snapshot regions ********************************/ +/*********************************************************************************/ - raw_mem_set = (mmalloc_get_current_heap() == raw_heap); + static mc_mem_region_t mc_region_new_dense(int type, void *start_addr, void* permanent_addr, size_t size, mc_mem_region_t ref_reg) +{ + mc_mem_region_t new_reg = xbt_new(s_mc_mem_region_t, 1); + new_reg->start_addr = start_addr; + new_reg->permanent_addr = permanent_addr; + new_reg->data = NULL; + new_reg->size = size; + new_reg->page_numbers = NULL; + new_reg->data = xbt_malloc(size); + memcpy(new_reg->data, permanent_addr, size); + XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu", + type, new_reg->data, permanent_addr, size); + return new_reg; - MC_SET_RAW_MEM; - - unsigned int i = 0; - s_map_region_t reg; - memory_map_t maps = get_memory_map(); +} - while (i < maps->mapsize) { - reg = maps->regions[i]; - if ((reg.prot & PROT_WRITE)){ - if (maps->regions[i].pathname == NULL){ - if(reg.start_addr == raw_heap){ - end_raw_heap = reg.end_addr; - } - } else { - if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){ - start_data_libsimgrid = reg.start_addr; - } - } - }else if ((reg.prot & PROT_READ)){ - if (maps->regions[i].pathname != NULL){ - if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){ - start_text_libsimgrid = reg.start_addr; - libsimgrid_path = strdup(maps->regions[i].pathname); - }else{ - if (!memcmp(basename(maps->regions[i].pathname), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){ - start_text_binary = reg.start_addr; - } - } - } - } - i++; +/** @brief Take a snapshot of a given region + * + * @param type + * @param start_addr Address of the region in the simulated process + * @param permanent_addr Permanent address of this data (for privatized variables, this is the virtual address of the privatized mapping) + * @param size Size of the data* + * @param ref_reg Reference corresponding region + */ +static mc_mem_region_t MC_region_new(int type, void *start_addr, void* permanent_addr, size_t size, mc_mem_region_t ref_reg) +{ + if (_sg_mc_sparse_checkpoint) { + return mc_region_new_sparse(type, start_addr, permanent_addr, size, ref_reg); + } else { + return mc_region_new_dense(type, start_addr, permanent_addr, size, ref_reg); } - - free_memory_map(maps); +} - MC_UNSET_RAW_MEM; +/** @brief Restore a region from a snapshot + * + * If we are using per page snapshots, it is possible to use the reference + * region in order to do an incremental restoration of the region: the + * softclean pages which are shared between the two snapshots do not need + * to be restored. + * + * @param reg Target region + * @param reg_reg Current region (if not NULL), used for lazy per page restoration + */ +static void MC_region_restore(mc_mem_region_t reg, mc_mem_region_t ref_reg) +{ + /*FIXME: check if start_addr is still mapped, if it is not, then map it + before copying the data */ + if (!reg->page_numbers) { + memcpy(reg->permanent_addr, reg->data, reg->size); + } else { + mc_region_restore_sparse(reg, ref_reg); + } + return; +} - if(raw_mem_set) - MC_SET_RAW_MEM; +static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, + void *start_addr, void* permanent_addr, size_t size) +{ + mc_mem_region_t ref_reg = + mc_model_checker->parent_snapshot ? mc_model_checker->parent_snapshot->regions[type] : NULL; + mc_mem_region_t new_reg = MC_region_new(type, start_addr, permanent_addr, size, ref_reg); + snapshot->regions[type] = new_reg; + return; } -mc_snapshot_t MC_take_snapshot_liveness() +static void MC_get_memory_regions(mc_snapshot_t snapshot) { - raw_mem_set = (mmalloc_get_current_heap() == raw_heap); - - MC_SET_RAW_MEM; + void *start_heap = ((xbt_mheap_t) std_heap)->base; + void *end_heap = ((xbt_mheap_t) std_heap)->breakval; + MC_snapshot_add_region(snapshot, 0, start_heap, start_heap, + (char *) end_heap - (char *) start_heap); + snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap); + snapshot->privatization_regions = NULL; + + MC_snapshot_add_region(snapshot, 1, + mc_libsimgrid_info->start_rw, mc_libsimgrid_info->start_rw, + mc_libsimgrid_info->end_rw - mc_libsimgrid_info->start_rw); + +#ifdef HAVE_SMPI + size_t i; + if (smpi_privatize_global_variables && smpi_process_count()) { + // Snapshot the global variable of the application separately for each + // simulated process: + snapshot->privatization_regions = + xbt_new(mc_mem_region_t, smpi_process_count()); + for (i = 0; i < smpi_process_count(); i++) { + mc_mem_region_t ref_reg = + mc_model_checker->parent_snapshot ? mc_model_checker->parent_snapshot->privatization_regions[i] : NULL; + snapshot->privatization_regions[i] = + MC_region_new(-1, mc_binary_info->start_rw, smpi_privatisation_regions[i].address, size_data_exe, ref_reg); + } + snapshot->privatization_index = smpi_loaded_page; + snapshot->regions[2] = NULL; + } else +#endif + { + MC_snapshot_add_region(snapshot, 2, + mc_binary_info->start_rw, mc_binary_info->start_rw, + mc_binary_info->end_rw - mc_binary_info->start_rw); + snapshot->privatization_regions = NULL; + snapshot->privatization_index = -1; + } +} - mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1); +/** @brief Finds the range of the different memory segments and binary paths */ +void MC_init_memory_map_info() +{ unsigned int i = 0; s_map_region_t reg; - memory_map_t maps = get_memory_map(); - int nb_reg = 0; - void *heap = NULL; + memory_map_t maps = MC_get_memory_map(); + + maestro_stack_start = NULL; + maestro_stack_end = NULL; + libsimgrid_path = NULL; - /* Save the std heap and the writable mapped pages of libsimgrid */ while (i < maps->mapsize) { reg = maps->regions[i]; - if ((reg.prot & PROT_WRITE)){ - if (maps->regions[i].pathname == NULL){ - if (reg.start_addr == std_heap){ // only save the std heap (and not the raw one) - MC_snapshot_add_region(snapshot, 0, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr); - heap = snapshot->regions[nb_reg]->data; - nb_reg++; - }else if(reg.start_addr == raw_heap){ - end_raw_heap = reg.end_addr; - } - i++; - } else { - if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){ - MC_snapshot_add_region(snapshot, 1, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr); - start_data_libsimgrid = reg.start_addr; - nb_reg++; - i++; - reg = maps->regions[i]; - while(reg.pathname == NULL && (reg.prot & PROT_WRITE) && i < maps->mapsize){ - MC_snapshot_add_region(snapshot, 1, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr); - i++; - reg = maps->regions[i]; - nb_reg++; - } - } else { - if (!memcmp(basename(maps->regions[i].pathname), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){ - MC_snapshot_add_region(snapshot, 2, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr); - nb_reg++; - } - i++; - } - } - }else if ((reg.prot & PROT_READ)){ - if (maps->regions[i].pathname != NULL){ - if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){ - start_text_libsimgrid = reg.start_addr; - libsimgrid_path = strdup(maps->regions[i].pathname); - }else{ - if (!memcmp(basename(maps->regions[i].pathname), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){ - start_text_binary = reg.start_addr; - } - } - } - i++; - }else{ - i++; + if (maps->regions[i].pathname == NULL) { + // Nothing to do + } else if ((reg.prot & PROT_WRITE) + && !memcmp(maps->regions[i].pathname, "[stack]", 7)) { + maestro_stack_start = reg.start_addr; + maestro_stack_end = reg.end_addr; + } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC) + && !memcmp(basename(maps->regions[i].pathname), "libsimgrid", + 10)) { + if (libsimgrid_path == NULL) + libsimgrid_path = strdup(maps->regions[i].pathname); } + i++; } - snapshot->stacks = take_snapshot_stacks(heap); - - free_memory_map(maps); - - MC_UNSET_RAW_MEM; + xbt_assert(maestro_stack_start, "maestro_stack_start"); + xbt_assert(maestro_stack_end, "maestro_stack_end"); + xbt_assert(libsimgrid_path, "libsimgrid_path&"); - if(raw_mem_set) - MC_SET_RAW_MEM; - - return snapshot; + MC_free_memory_map(maps); } -void MC_restore_snapshot(mc_snapshot_t snapshot) +/** \brief Fill/lookup the "subtype" field. + */ +static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type) { - unsigned int i; - for(i=0; i < snapshot->num_reg; i++){ - MC_region_restore(snapshot->regions[i]); + + if (type->dw_type_id == NULL) + return; + type->subtype = xbt_dict_get_or_null(info->types, type->dw_type_id); + if (type->subtype == NULL) + return; + if (type->subtype->byte_size != 0) + return; + if (type->subtype->name == NULL) + return; + // Try to find a more complete description of the type: + // We need to fix in order to support C++. + + dw_type_t subtype = + xbt_dict_get_or_null(info->full_types_by_name, type->subtype->name); + if (subtype != NULL) { + type->subtype = subtype; } } -void MC_free_snapshot(mc_snapshot_t snapshot) +void MC_post_process_types(mc_object_info_t info) { - unsigned int i; - for(i=0; i < snapshot->num_reg; i++) - MC_region_destroy(snapshot->regions[i]); - - xbt_dynar_free(&(snapshot->stacks)); - xbt_free(snapshot); + xbt_dict_cursor_t cursor = NULL; + char *origin; + dw_type_t type; + + // Lookup "subtype" field: + xbt_dict_foreach(info->types, cursor, origin, type) { + MC_resolve_subtype(info, type); + + dw_type_t member; + unsigned int i = 0; + if (type->members != NULL) + xbt_dynar_foreach(type->members, i, member) { + MC_resolve_subtype(info, member); + } + } } +/** \brief Fills the position of the segments (executable, read-only, read/write). + * + * TODO, use dl_iterate_phdr to be more robust + * */ +void MC_find_object_address(memory_map_t maps, mc_object_info_t result) +{ -void get_libsimgrid_plt_section(){ - - FILE *fp; - char *line = NULL; /* Temporal storage for each line that is readed */ - ssize_t read; /* Number of bytes readed */ - size_t n = 0; /* Amount of bytes to read by getline */ - - char *lfields[7]; - int i, plt_not_found = 1; - unsigned long int size, offset; - - if(libsimgrid_path == NULL) - libsimgrid_path = get_libsimgrid_path(); + unsigned int i = 0; + s_map_region_t reg; + const char *name = basename(result->file_name); + while (i < maps->mapsize) { + reg = maps->regions[i]; + if (maps->regions[i].pathname == NULL + || strcmp(basename(maps->regions[i].pathname), name)) { + // Nothing to do + } else if ((reg.prot & PROT_WRITE)) { + xbt_assert(!result->start_rw, + "Multiple read-write segments for %s, not supported", + maps->regions[i].pathname); + result->start_rw = reg.start_addr; + result->end_rw = reg.end_addr; + // .bss is usually after the .data: + s_map_region_t *next = &(maps->regions[i + 1]); + if (next->pathname == NULL && (next->prot & PROT_WRITE) + && next->start_addr == reg.end_addr) { + result->end_rw = maps->regions[i + 1].end_addr; + } + } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)) { + xbt_assert(!result->start_exec, + "Multiple executable segments for %s, not supported", + maps->regions[i].pathname); + result->start_exec = reg.start_addr; + result->end_exec = reg.end_addr; + } else if ((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) { + xbt_assert(!result->start_ro, + "Multiple read only segments for %s, not supported", + maps->regions[i].pathname); + result->start_ro = reg.start_addr; + result->end_ro = reg.end_addr; + } + i++; + } - char *command = bprintf("objdump --section-headers %s", libsimgrid_path); + xbt_assert(result->file_name); + xbt_assert(result->start_rw); + xbt_assert(result->start_exec); +} - fp = popen(command, "r"); +/************************************* 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 frame Scope description + * \param ip Instruction pointer + * \return true if the variable is valid + * */ +static bool mc_valid_variable(dw_variable_t var, dw_frame_t scope, + const void *ip) +{ + // The variable is not yet valid: + if ((const void *) ((const char *) scope->low_pc + var->start_scope) > ip) + return false; + else + return true; +} - if(fp == NULL) - perror("popen failed"); +static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame, + dw_frame_t scope, int process_index, xbt_dynar_t result) +{ + void *ip = (void *) stack_frame->ip; + if (ip < scope->low_pc || ip >= scope->high_pc) + return; - while ((read = getline(&line, &n, fp)) != -1 && plt_not_found == 1) { + unsigned cursor = 0; + dw_variable_t current_variable; + xbt_dynar_foreach(scope->variables, cursor, current_variable) { - if(n == 0) + if (!mc_valid_variable(current_variable, scope, (void *) stack_frame->ip)) continue; - /* Wipeout the new line character */ - line[read - 1] = '\0'; + int region_type; + if ((long) stack_frame->ip > (long) mc_libsimgrid_info->start_exec) + region_type = 1; + else + region_type = 2; + + local_variable_t new_var = xbt_new0(s_local_variable_t, 1); + new_var->subprogram = stack_frame->frame; + new_var->ip = stack_frame->ip; + new_var->name = xbt_strdup(current_variable->name); + new_var->type = current_variable->type; + new_var->region = region_type; + + if (current_variable->address != NULL) { + new_var->address = current_variable->address; + } else if (current_variable->locations.size != 0) { + new_var->address = + (void *) mc_dwarf_resolve_locations(¤t_variable->locations, + current_variable->object_info, + &(stack_frame->unw_cursor), + (void *) stack_frame->frame_base, + NULL, process_index); + } else { + xbt_die("No address"); + } - lfields[0] = strtok(line, " "); + xbt_dynar_push(result, &new_var); + } - if(lfields[0] == NULL) - continue; + // Recursive processing of nested scopes: + dw_frame_t nested_scope = NULL; + xbt_dynar_foreach(scope->scopes, cursor, nested_scope) { + mc_fill_local_variables_values(stack_frame, nested_scope, process_index, result); + } +} - if(strcmp(lfields[0], "Sections:") == 0 || strcmp(lfields[0], "Idx") == 0 || strncmp(lfields[0], libsimgrid_path, strlen(libsimgrid_path)) == 0) - continue; +static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames, int process_index) +{ - for (i = 1; i < 7 && lfields[i - 1] != NULL; i++) { - lfields[i] = strtok(NULL, " "); - } + unsigned cursor1 = 0; + mc_stack_frame_t stack_frame; + xbt_dynar_t variables = + xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp); - if(i>=6){ - if(strcmp(lfields[1], ".plt") == 0){ - size = strtoul(lfields[2], NULL, 16); - offset = strtoul(lfields[5], NULL, 16); - start_plt_libsimgrid = (char *)start_text_libsimgrid + offset; - end_plt_libsimgrid = (char *)start_plt_libsimgrid + size; - plt_not_found = 0; - } - } - + xbt_dynar_foreach(stack_frames, cursor1, stack_frame) { + mc_fill_local_variables_values(stack_frame, stack_frame->frame, process_index, variables); } - free(command); - free(line); - pclose(fp); - + return variables; } -void get_binary_plt_section(){ +static void MC_stack_frame_free_voipd(void *s) +{ + mc_stack_frame_t stack_frame = *(mc_stack_frame_t *) s; + if (stack_frame) { + xbt_free(stack_frame->frame_name); + xbt_free(stack_frame); + } +} - FILE *fp; - char *line = NULL; /* Temporal storage for each line that is readed */ - ssize_t read; /* Number of bytes readed */ - size_t n = 0; /* Amount of bytes to read by getline */ +static xbt_dynar_t MC_unwind_stack_frames(void *stack_context) +{ + xbt_dynar_t result = + xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd); - char *lfields[7]; - int i, plt_not_found = 1; - unsigned long int size, offset; + unw_cursor_t c; - char *command = bprintf( "objdump --section-headers %s", xbt_binary_name); + // TODO, check condition check (unw_init_local==0 means end of frame) + if (unw_init_local(&c, (unw_context_t *) stack_context) != 0) { - fp = popen(command, "r"); + xbt_die("Could not initialize stack unwinding"); - if(fp == NULL) - perror("popen failed"); + } else + while (1) { - while ((read = getline(&line, &n, fp)) != -1 && plt_not_found == 1) { + mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1); + xbt_dynar_push(result, &stack_frame); - if(n == 0) - continue; + stack_frame->unw_cursor = c; - /* Wipeout the new line character */ - line[read - 1] = '\0'; + unw_word_t ip, sp; - lfields[0] = strtok(line, " "); + unw_get_reg(&c, UNW_REG_IP, &ip); + unw_get_reg(&c, UNW_REG_SP, &sp); - if(lfields[0] == NULL) - continue; + stack_frame->ip = ip; + stack_frame->sp = sp; - if(strcmp(lfields[0], "Sections:") == 0 || strcmp(lfields[0], "Idx") == 0 || strncmp(lfields[0], basename(xbt_binary_name), strlen(xbt_binary_name)) == 0) - continue; + // TODO, use real addresses in frame_t instead of fixing it here - for (i = 1; i < 7 && lfields[i - 1] != NULL; i++) { - lfields[i] = strtok(NULL, " "); - } + dw_frame_t frame = MC_find_function_by_ip((void *) ip); + stack_frame->frame = frame; - if(i>=6){ - if(strcmp(lfields[1], ".plt") == 0){ - size = strtoul(lfields[2], NULL, 16); - offset = strtoul(lfields[5], NULL, 16); - start_plt_binary = (char *)start_text_binary + offset; - end_plt_binary = (char *)start_plt_binary + size; - plt_not_found = 0; + if (frame) { + stack_frame->frame_name = xbt_strdup(frame->name); + stack_frame->frame_base = + (unw_word_t) mc_find_frame_base(frame, frame->object_info, &c); + } else { + stack_frame->frame_base = 0; + stack_frame->frame_name = NULL; } - } - - - } - free(command); - free(line); - pclose(fp); + /* Stop before context switch with maestro */ + if (frame != NULL && frame->name != NULL + && !strcmp(frame->name, "smx_ctx_sysv_wrapper")) + break; -} + int ret = ret = unw_step(&c); + if (ret == 0) { + xbt_die("Unexpected end of stack."); + } else if (ret < 0) { + xbt_die("Error while unwinding stack."); + } + } -static void add_value(xbt_dynar_t *list, const char *type, unsigned long int val){ - variable_value_t value = xbt_new0(s_variable_value_t, 1); - value->type = strdup(type); - if(strcmp(type, "value") == 0){ - value->value.res = val; - }else{ - value->value.address = (void *)val; + if (xbt_dynar_length(result) == 0) { + XBT_INFO("unw_init_local failed"); + xbt_abort(); } - xbt_dynar_push(*list, &value); -} -static xbt_dynar_t take_snapshot_stacks(void *heap){ + return result; +}; + +static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t * snapshot) +{ - xbt_dynar_t res = xbt_dynar_new(sizeof(s_mc_snapshot_stack_t), NULL); + xbt_dynar_t res = + xbt_dynar_new(sizeof(s_mc_snapshot_stack_t), + MC_snapshot_stack_free_voidp); - unsigned int cursor1 = 0; + unsigned int cursor = 0; stack_region_t current_stack; - - xbt_dynar_foreach(stacks_areas, cursor1, current_stack){ + + xbt_dynar_foreach(stacks_areas, cursor, current_stack) { mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1); - st->local_variables = get_local_variables_values(current_stack->context, heap); - st->stack_pointer = get_stack_pointer(current_stack->context, heap); + st->stack_frames = MC_unwind_stack_frames(current_stack->context); + st->local_variables = MC_get_local_variables_values(st->stack_frames, current_stack->process_index); + st->process_index = current_stack->process_index; + + unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp; + xbt_dynar_push(res, &st); + (*snapshot)->stack_sizes = + xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t)); + (*snapshot)->stack_sizes[cursor] = + (char*) current_stack->address + current_stack->size - (char*) sp; } return res; } -static void *get_stack_pointer(void *stack_context, void *heap){ +static xbt_dynar_t MC_take_snapshot_ignore() +{ - unw_cursor_t c; - int ret; - unw_word_t sp; + if (mc_heap_comparison_ignore == NULL) + return NULL; - ret = unw_init_local(&c, (unw_context_t *)stack_context); - if(ret < 0){ - XBT_INFO("unw_init_local failed"); - xbt_abort(); + xbt_dynar_t cpy = + xbt_dynar_new(sizeof(mc_heap_ignore_region_t), + heap_ignore_region_free_voidp); + + unsigned int cursor = 0; + mc_heap_ignore_region_t current_region; + + xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region) { + mc_heap_ignore_region_t new_region = NULL; + new_region = xbt_new0(s_mc_heap_ignore_region_t, 1); + new_region->address = current_region->address; + new_region->size = current_region->size; + new_region->block = current_region->block; + new_region->fragment = current_region->fragment; + xbt_dynar_push(cpy, &new_region); } - unw_get_reg(&c, UNW_REG_SP, &sp); + return cpy; - return ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap))); +} +static void mc_free_snapshot_ignored_data_pvoid(void* data) { + mc_snapshot_ignored_data_t ignored_data = (mc_snapshot_ignored_data_t) data; + free(ignored_data->data); } -static xbt_strbuff_t get_local_variables_values(void *stack_context, void *heap){ - - unw_cursor_t c; - int ret; - //char *stack_name; +static void MC_snapshot_handle_ignore(mc_snapshot_t snapshot) +{ + snapshot->ignored_data = xbt_dynar_new(sizeof(s_mc_snapshot_ignored_data_t), mc_free_snapshot_ignored_data_pvoid); + + // Copy the memory: + unsigned int cursor = 0; + mc_checkpoint_ignore_region_t region; + xbt_dynar_foreach (mc_checkpoint_ignore, cursor, region) { + s_mc_snapshot_ignored_data_t ignored_data; + ignored_data.start = region->addr; + ignored_data.size = region->size; + ignored_data.data = malloc(region->size); + memcpy(ignored_data.data, region->addr, region->size); + xbt_dynar_push(snapshot->ignored_data, &ignored_data); + } - char frame_name[256]; - - ret = unw_init_local(&c, (unw_context_t *)stack_context); - if(ret < 0){ - XBT_INFO("unw_init_local failed"); - xbt_abort(); + // Zero the memory: + xbt_dynar_foreach (mc_checkpoint_ignore, cursor, region) { + memset(region->addr, 0, region->size); } - //stack_name = strdup(((smx_process_t)((smx_ctx_sysv_t)(stack->address))->super.data)->name); +} - unw_word_t ip, sp, off; - dw_frame_t frame; - - xbt_dynar_t compose = xbt_dynar_new(sizeof(variable_value_t), NULL); +static void MC_snapshot_ignore_restore(mc_snapshot_t snapshot) +{ + unsigned int cursor = 0; + s_mc_snapshot_ignored_data_t ignored_data; + xbt_dynar_foreach (snapshot->ignored_data, cursor, ignored_data) { + memcpy(ignored_data.start, ignored_data.data, ignored_data.size); + } +} - xbt_strbuff_t variables = xbt_strbuff_new(); - xbt_dict_cursor_t dict_cursor; - char *variable_name; - dw_local_variable_t current_variable; - unsigned int cursor = 0, cursor2 = 0; - dw_location_entry_t entry = NULL; - dw_location_t location_entry = NULL; - unw_word_t res; - int frame_found = 0; - void *frame_pointer_address = NULL; - long true_ip; +/** @brief Can we remove this snapshot? + * + * Some snapshots cannot be removed (yet) because we need them + * at this point. + * + * @param snapshot + */ +int mc_important_snapshot(mc_snapshot_t snapshot) +{ + // We need this snapshot in order to know which + // pages needs to be stored in the next snapshot: + if (snapshot == mc_model_checker->parent_snapshot) + return true; - while(ret >= 0){ + return false; +} - unw_get_reg(&c, UNW_REG_IP, &ip); - unw_get_reg(&c, UNW_REG_SP, &sp); +mc_snapshot_t MC_take_snapshot(int num_state) +{ - unw_get_proc_name (&c, frame_name, sizeof (frame_name), &off); + mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1); + snapshot->enabled_processes = xbt_dynar_new(sizeof(int), NULL); + smx_process_t process; + xbt_swag_foreach(process, simix_global->process_list) { + xbt_dynar_push_as(snapshot->enabled_processes, int, (int)process->pid); + } - xbt_strbuff_append(variables, bprintf("ip=%s\n", frame_name)); + MC_snapshot_handle_ignore(snapshot); - frame = xbt_dict_get_or_null(mc_local_variables, frame_name); + /* Save the std heap and the writable mapped pages of libsimgrid and binary */ + MC_get_memory_regions(snapshot); + if (_sg_mc_sparse_checkpoint && _sg_mc_soft_dirty) { + mc_softdirty_reset(); + } - if(frame == NULL){ - ret = unw_step(&c); - continue; - } + snapshot->to_ignore = MC_take_snapshot_ignore(); - true_ip = (long)frame->low_pc + (long)off; - - /* Get frame pointer */ - switch(frame->frame_base->type){ - case e_dw_loclist: - while((cursor < xbt_dynar_length(frame->frame_base->location.loclist)) && frame_found == 0){ - entry = xbt_dynar_get_as(frame->frame_base->location.loclist, cursor, dw_location_entry_t); - if((true_ip >= entry->lowpc) && (true_ip < entry->highpc)){ - frame_found = 1; - switch(entry->location->type){ - case e_dw_compose: - xbt_dynar_reset(compose); - cursor2 = 0; - while(cursor2 < xbt_dynar_length(entry->location->location.compose)){ - location_entry = xbt_dynar_get_as(entry->location->location.compose, cursor2, dw_location_t); - switch(location_entry->type){ - case e_dw_register: - unw_get_reg(&c, location_entry->location.reg, &res); - add_value(&compose, "address", (long)res); - break; - case e_dw_bregister_op: - unw_get_reg(&c, location_entry->location.breg_op.reg, &res); - add_value(&compose, "address", (long)res + location_entry->location.breg_op.offset); - break; - default: - xbt_dynar_reset(compose); - break; - } - cursor2++; - } - - if(xbt_dynar_length(compose) > 0){ - frame_pointer_address = xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->value.address ; - } - break; - default : - frame_pointer_address = NULL; - break; - } - } - cursor++; - } - break; - default : - frame_pointer_address = NULL; - break; + if (_sg_mc_visited > 0 || strcmp(_sg_mc_property_file, "")) { + snapshot->stacks = + MC_take_snapshot_stacks(&snapshot); + if (_sg_mc_hash && snapshot->stacks != NULL) { + snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks); + } else { + snapshot->hash = 0; } - - frame_found = 0; - cursor = 0; - - //XBT_INFO("Frame %s", frame->name); - - xbt_dict_foreach(frame->variables, dict_cursor, variable_name, current_variable){ - if(current_variable->location != NULL){ - switch(current_variable->location->type){ - case e_dw_compose: - xbt_dynar_reset(compose); - cursor = 0; - while(cursor < xbt_dynar_length(current_variable->location->location.compose)){ - location_entry = xbt_dynar_get_as(current_variable->location->location.compose, cursor, dw_location_t); - switch(location_entry->type){ - case e_dw_register: - unw_get_reg(&c, location_entry->location.reg, &res); - add_value(&compose, "value", (long)res); - break; - case e_dw_bregister_op: - unw_get_reg(&c, location_entry->location.breg_op.reg, &res); - add_value(&compose, "address", (long)res + location_entry->location.breg_op.offset); - break; - case e_dw_fbregister_op: - if(frame_pointer_address != NULL) - add_value(&compose, "address", (long)((char *)frame_pointer_address + location_entry->location.fbreg_op)); - break; - default: - xbt_dynar_reset(compose); - break; - } - cursor++; - } - - if(xbt_dynar_length(compose) > 0){ - if(strcmp(xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->type, "value") == 0){ - //XBT_INFO("Variable : %s - value : %lx", current_variable->name, xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->value.res); - xbt_strbuff_append(variables, bprintf("%s=%lx\n", current_variable->name, xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->value.res)); - }else{ - if(*((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1,variable_value_t)->value.address) == NULL){ - //XBT_INFO("Variable : %s - address : NULL", current_variable->name); - xbt_strbuff_append(variables, bprintf("%s=NULL\n", current_variable->name)); - }else if(((long)*((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1,variable_value_t)->value.address) > 0xffffffff) || ((long)*((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1,variable_value_t)->value.address) < (long)start_text_binary)){ - //XBT_INFO("Variable : %s - value : %zd", current_variable->name, (size_t)*((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->value.address)); - xbt_strbuff_append(variables, bprintf("%s=%d\n", current_variable->name, (int)(long)*((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->value.address))); - }else{ - //XBT_INFO("Variable : %s - address : %p", current_variable->name, *((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->value.address)); - xbt_strbuff_append(variables, bprintf("%s=%p\n", current_variable->name, *((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1, variable_value_t)->value.address))); - } - } - }else{ - //XBT_INFO("Variable %s undefined", current_variable->name); - xbt_strbuff_append(variables, bprintf("%s=undefined\n", current_variable->name)); - } - break; - default : - break; - } - }else{ - //XBT_INFO("Variable : %s, no location", current_variable->name); - xbt_strbuff_append(variables, bprintf("%s=undefined\n", current_variable->name)); - } - } - - ret = unw_step(&c); - - //XBT_INFO(" "); - + } else { + snapshot->hash = 0; } - //free(stack_name); - - return variables; - + MC_snapshot_ignore_restore(snapshot); + if (_sg_mc_sparse_checkpoint && _sg_mc_soft_dirty) { + mc_model_checker->parent_snapshot = snapshot; + } + return snapshot; } -static void print_local_variables_values(xbt_dynar_t all_variables){ +void MC_restore_snapshot(mc_snapshot_t snapshot) +{ + mc_snapshot_t parent_snapshot = mc_model_checker->parent_snapshot; - unsigned cursor = 0; - mc_snapshot_stack_t stack; + unsigned int i; + for (i = 0; i < NB_REGIONS; i++) { + // For privatized, variables we decided it was not necessary to take the snapshot: + if (snapshot->regions[i]) + MC_region_restore(snapshot->regions[i], + parent_snapshot ? parent_snapshot->regions[i] : NULL); + } - xbt_dynar_foreach(all_variables, cursor, stack){ - XBT_INFO("%s", stack->local_variables->data); +#ifdef HAVE_SMPI + if (snapshot->privatization_regions) { + // Restore the global variables of the application separately for each + // simulated process: + for (i = 0; i < smpi_process_count(); i++) { + if (snapshot->privatization_regions[i]) { + MC_region_restore(snapshot->privatization_regions[i], + parent_snapshot ? parent_snapshot->privatization_regions[i] : NULL); + } + } } -} + if(snapshot->privatization_index >= 0) { + smpi_switch_data_segment(snapshot->privatization_index); + } +#endif + if (_sg_mc_sparse_checkpoint && _sg_mc_soft_dirty) { + mc_softdirty_reset(); + } -static void snapshot_stack_free(mc_snapshot_stack_t s){ - if(s){ - xbt_free(s->local_variables->data); - xbt_free(s->local_variables); - xbt_free(s); + MC_snapshot_ignore_restore(snapshot); + if (_sg_mc_sparse_checkpoint && _sg_mc_soft_dirty) { + mc_model_checker->parent_snapshot = snapshot; } } -void snapshot_stack_free_voidp(void *s){ - snapshot_stack_free((mc_snapshot_stack_t) * (void **) s); +mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall) +{ + return MC_take_snapshot(1); +} + +void *MC_snapshot(void) +{ + return simcall_mc_snapshot(); }