X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/1c6d709571a4371b1268d844704dffed57b80cba..6f9d5bdabcf16a0b36012f3d7cf32a2d736bb6f0:/src/mc/mc_checkpoint.c diff --git a/src/mc/mc_checkpoint.c b/src/mc/mc_checkpoint.c index 27503965cc..abb2dee35a 100644 --- a/src/mc/mc_checkpoint.c +++ b/src/mc/mc_checkpoint.c @@ -1,14 +1,21 @@ -/* Copyright (c) 2008-2013. The SimGrid Team. +/* 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. */ #define _GNU_SOURCE +#define UNW_LOCAL_ONLY + #include #include #include "mc_private.h" #include "xbt/module.h" +#include +#include "../smpi/private.h" +#include + +#include "xbt/mmalloc/mmprivate.h" #include "../simix/smx_private.h" @@ -16,198 +23,162 @@ #include #include "mc_private.h" +#include + +#include "mc_mmu.h" XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc, "Logging specific to mc_checkpoint"); char *libsimgrid_path; -static void MC_find_object_address(memory_map_t maps, mc_object_info_t result); - /************************************ Free functions **************************************/ /*****************************************************************************************/ -static void MC_snapshot_stack_free(mc_snapshot_stack_t s){ - if(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 void MC_snapshot_stack_free_voidp(void *s){ +static void MC_snapshot_stack_free_voidp(void *s) +{ MC_snapshot_stack_free((mc_snapshot_stack_t) * (void **) s); } -static void local_variable_free(local_variable_t v){ - xbt_free(v->frame); +static void local_variable_free(local_variable_t v) +{ xbt_free(v->name); - xbt_free(v->type); xbt_free(v); } -static void local_variable_free_voidp(void *v){ +static void local_variable_free_voidp(void *v) +{ local_variable_free((local_variable_t) * (void **) v); } static void MC_region_destroy(mc_mem_region_t reg) { + //munmap(reg->data, reg->size); xbt_free(reg->data); xbt_free(reg); } -void MC_free_snapshot(mc_snapshot_t snapshot){ +void MC_free_snapshot(mc_snapshot_t snapshot) +{ unsigned int i; - for(i=0; i < NB_REGIONS; i++) + for (i = 0; i < NB_REGIONS; i++) MC_region_destroy(snapshot->regions[i]); xbt_free(snapshot->stack_sizes); xbt_dynar_free(&(snapshot->stacks)); xbt_dynar_free(&(snapshot->to_ignore)); + xbt_dynar_free(&snapshot->ignored_data); + + 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); + } + xbt_free(snapshot); } - /******************************* Snapshot regions ********************************/ /*********************************************************************************/ -static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size) +static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size, mc_mem_region_t ref_reg) { - mc_mem_region_t new_reg = xbt_new0(s_mc_mem_region_t, 1); + if (_sg_mc_sparse_checkpoint) { + return mc_region_new_sparse(type, start_addr, size, ref_reg); + } + + mc_mem_region_t new_reg = xbt_new(s_mc_mem_region_t, 1); new_reg->start_addr = start_addr; + new_reg->data = NULL; new_reg->size = size; - new_reg->data = xbt_malloc0(size); + new_reg->page_numbers = NULL; + new_reg->data = xbt_malloc(size); memcpy(new_reg->data, start_addr, size); - - XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu", type, new_reg->data, start_addr, size); - + XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu", + type, new_reg->data, start_addr, size); return new_reg; + } -static void MC_region_restore(mc_mem_region_t reg) +/** @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 */ - - memcpy(reg->start_addr, reg->data, reg->size); + if (!reg->page_numbers) { + memcpy(reg->start_addr, reg->data, reg->size); + } else { + mc_region_restore_sparse(reg, ref_reg); + } return; } -static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size) +static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, + void *start_addr, size_t size) + { - mc_mem_region_t new_reg = MC_region_new(type, start_addr, 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, size, ref_reg); snapshot->regions[type] = new_reg; return; -} - -static void MC_get_memory_regions(mc_snapshot_t snapshot){ - - FILE *fp; - char *line = NULL; - ssize_t read; - size_t n = 0; - - char *lfields[6] = {0}, *tok; - void *start_addr, *start_addr1, *end_addr; - size_t size; - int i; - - fp = fopen("/proc/self/maps", "r"); - - xbt_assert(fp, - "Cannot open /proc/self/maps to investigate the memory map of the process. Please report this bug."); - - setbuf(fp, NULL); - - while((read = xbt_getline(&line, &n, fp)) != -1){ - - /* Wipeout the new line character */ - line[read - 1] = '\0'; - - /* Tokenize the line using spaces as delimiters and store each token */ - lfields[0] = strtok(line, " "); - - for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) { - lfields[i] = strtok(NULL, " "); - } +} - /* First get the permissions flags, need write permission */ - if(lfields[1][1] == 'w'){ - - /* Get the start address of the map */ - tok = strtok(lfields[0], "-"); - start_addr = (void *)strtoul(tok, NULL, 16); - - if(start_addr == std_heap){ /* Std_heap ? */ - tok = strtok(NULL, "-"); - end_addr = (void *)strtoul(tok, NULL, 16); - MC_snapshot_add_region(snapshot, 0, start_addr, (char*)end_addr - (char*)start_addr); - snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap); - }else{ /* map name == libsimgrid || binary_name ? */ - if(lfields[5] != NULL){ - if(!memcmp(basename(lfields[5]), "libsimgrid", 10)){ - tok = strtok(NULL, "-"); - end_addr = (void *)strtoul(tok, NULL, 16); - size = (char*)end_addr - (char*)start_addr; - /* BSS and data segments may be separated according to the OS */ - if((read = xbt_getline(&line, &n, fp)) != -1){ - line[read - 1] = '\0'; - lfields[0] = strtok(line, " "); - for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) { - lfields[i] = strtok(NULL, " "); - } - if(lfields[1][1] == 'w' && lfields[5] == NULL){ - tok = strtok(lfields[0], "-"); - start_addr1 = (void *)strtoul(tok, NULL, 16); - tok = strtok(NULL, "-"); - size += (char *)(void *)strtoul(tok, NULL, 16) - (char*)start_addr1; - } - } - MC_snapshot_add_region(snapshot, 1, start_addr, size); - }else if(!memcmp(basename(lfields[5]), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){ - tok = strtok(NULL, "-"); - end_addr = (void *)strtoul(tok, NULL, 16); - size = (char*)end_addr - (char*)start_addr; - /* BSS and data segments may be separated according to the OS */ - if((read = xbt_getline(&line, &n, fp)) != -1){ - line[read - 1] = '\0'; - lfields[0] = strtok(line, " "); - for (i = 1; i < 6 && lfields[i - 1] != NULL; i++) { - lfields[i] = strtok(NULL, " "); - } - tok = strtok(lfields[0], "-"); - start_addr1 = (void *)strtoul(tok, NULL, 16); - if(lfields[1][1] == 'w'){ - if(start_addr1 == std_heap){ /* Std_heap ? */ - tok = strtok(NULL, "-"); - end_addr = (void *)strtoul(tok, NULL, 16); - MC_snapshot_add_region(snapshot, 0, start_addr1, (char*)end_addr - (char*)start_addr1); - snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap); - }else if(start_addr1 != raw_heap){ - tok = strtok(NULL, "-"); - size += (char *)(void *)strtoul(tok, NULL, 16) - (char *)start_addr1; - } - } - } - MC_snapshot_add_region(snapshot, 2, start_addr, size); - }else if (!memcmp(lfields[5], "[stack]", 7)){ - maestro_stack_start = start_addr; - tok = strtok(NULL, "-"); - maestro_stack_end = (void *)strtoul(tok, NULL, 16); - } - } - } +static void MC_get_memory_regions(mc_snapshot_t snapshot) +{ + size_t i; + + 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, + (char *) end_heap - (char *) start_heap); + snapshot->heap_bytes_used = mmalloc_get_bytes_used(std_heap); + + MC_snapshot_add_region(snapshot, 1, mc_libsimgrid_info->start_rw, + mc_libsimgrid_info->end_rw - + mc_libsimgrid_info->start_rw); + if (!smpi_privatize_global_variables) { + MC_snapshot_add_region(snapshot, 2, mc_binary_info->start_rw, + mc_binary_info->end_rw - mc_binary_info->start_rw); + snapshot->privatization_regions = NULL; + snapshot->privatization_index = -1; + } else { + snapshot->privatization_regions = + xbt_new(mc_mem_region_t, SIMIX_process_count()); + for (i = 0; i < SIMIX_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, mappings[i], size_data_exe, ref_reg); } - + snapshot->privatization_index = loaded_page; } - - free(line); - fclose(fp); - } /** @brief Finds the range of the different memory segments and binary paths */ -void MC_init_memory_map_info(){ - +void MC_init_memory_map_info() +{ + unsigned int i = 0; s_map_region_t reg; memory_map_t maps = MC_get_memory_map(); @@ -220,13 +191,15 @@ void MC_init_memory_map_info(){ reg = maps->regions[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); + } 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++; } @@ -239,87 +212,89 @@ void MC_init_memory_map_info(){ } -/** \brief Fill/llokup the "subtype" field. +/** \brief Fill/lookup the "subtype" field. */ -static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type) { +static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type) +{ - if(type->dw_type_id==NULL) + if (type->dw_type_id == NULL) return; type->subtype = xbt_dict_get_or_null(info->types, type->dw_type_id); - if(type->subtype==NULL) + if (type->subtype == NULL) return; - if(type->subtype->byte_size != 0) + if (type->subtype->byte_size != 0) return; - if(type->subtype->name==NULL) + 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->types_by_name, type->subtype->name); - if(subtype!=NULL) { + dw_type_t subtype = + xbt_dict_get_or_null(info->full_types_by_name, type->subtype->name); + if (subtype != NULL) { type->subtype = subtype; } - // TODO, support "switch type" (looking up the type in another lib) when possible } -static void MC_post_process_types(mc_object_info_t info) { +void MC_post_process_types(mc_object_info_t info) +{ xbt_dict_cursor_t cursor = NULL; char *origin; dw_type_t type; // Lookup "subtype" field: - xbt_dict_foreach(info->types, cursor, origin, type){ + 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) { + if (type->members != NULL) + xbt_dynar_foreach(type->members, i, member) { MC_resolve_subtype(info, member); - } + } } } -/** \brief Finds informations about a given shared object/executable */ -mc_object_info_t MC_find_object_info(memory_map_t maps, char* name) { - mc_object_info_t result = MC_new_object_info(); - result->file_name = xbt_strdup(name); - MC_find_object_address(maps, result); - MC_dwarf_get_variables(result); - MC_post_process_types(result); - return result; -} - -/** \brief Fills the position of the .bss and .data sections. */ -static void MC_find_object_address(memory_map_t maps, mc_object_info_t result) { +/** \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) +{ unsigned int i = 0; s_map_region_t reg; - const char* name = basename(result->file_name); + 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)) { + 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; - } 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; + } 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++; } @@ -332,233 +307,204 @@ static void MC_find_object_address(memory_map_t maps, mc_object_info_t result) { /************************************* Take Snapshot ************************************/ /****************************************************************************************/ -static void MC_get_hash_global(char *snapshot_hash, void *data1, void *data2){ - - /* unsigned int cursor = 0; */ - /* size_t offset; */ - /* global_variable_t current_var; */ - /* void *addr_pointed = NULL; */ - /* void *res = NULL; */ - - /* xbt_strbuff_t clear = xbt_strbuff_new(); */ - - /* xbt_dynar_foreach(mc_global_variables, cursor, current_var){ */ - /* if(current_var->address < start_data_libsimgrid){ /\* binary *\/ */ - /* offset = (char *)current_var->address - (char *)start_data_binary; */ - /* addr_pointed = *((void **)((char *)data2 + offset)); */ - /* if(((addr_pointed >= start_plt_binary && addr_pointed <= end_plt_binary)) || ((addr_pointed >= std_heap && (char *)addr_pointed <= (char *)std_heap + STD_HEAP_SIZE ))) */ - /* continue; */ - /* res = xbt_malloc0(current_var->size + 1); */ - /* memset(res, 0, current_var->size + 1); */ - /* memcpy(res, (char*)data2 + offset, current_var->size); */ - /* }else{ /\* libsimgrid *\/ */ - /* offset = (char *)current_var->address - (char *)start_data_libsimgrid; */ - /* addr_pointed = *((void **)((char *)data1 + offset)); */ - /* if((addr_pointed >= start_plt_libsimgrid && addr_pointed <= end_plt_libsimgrid) || (addr_pointed >= std_heap && (char *)addr_pointed <= (char *)std_heap + STD_HEAP_SIZE )) */ - /* continue; */ - /* res = xbt_malloc0(current_var->size + 1); */ - /* memset(res, 0, current_var->size + 1); */ - /* memcpy(res, (char*)data1 + offset, current_var->size); */ - /* } */ - /* if(res != NULL){ */ - /* xbt_strbuff_append(clear, (const char*)res); */ - /* xbt_free(res); */ - /* res = NULL; */ - /* } */ - /* } */ - - /* xbt_sha(clear->data, snapshot_hash); */ - - /* xbt_strbuff_free(clear); */ - +/** \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; } -static void MC_get_hash_local(char *snapshot_hash, xbt_dynar_t stacks){ - - /* xbt_dynar_t tokens = NULL, s_tokens = NULL; */ - /* unsigned int cursor1 = 0, cursor2 = 0; */ - /* mc_snapshot_stack_t current_stack; */ - /* char *frame_name = NULL; */ - /* void *addr; */ - - /* xbt_strbuff_t clear = xbt_strbuff_new(); */ - - /* while(cursor1 < xbt_dynar_length(stacks)){ */ - /* current_stack = xbt_dynar_get_as(stacks, cursor1, mc_snapshot_stack_t); */ - /* tokens = xbt_str_split(current_stack->local_variables->data, NULL); */ - /* cursor2 = 0; */ - /* while(cursor2 < xbt_dynar_length(tokens)){ */ - /* s_tokens = xbt_str_split(xbt_dynar_get_as(tokens, cursor2, char *), "="); */ - /* if(xbt_dynar_length(s_tokens) > 1){ */ - /* if(strcmp(xbt_dynar_get_as(s_tokens, 0, char *), "frame_name") == 0){ */ - /* xbt_free(frame_name); */ - /* frame_name = xbt_strdup(xbt_dynar_get_as(s_tokens, 1, char *)); */ - /* xbt_strbuff_append(clear, (const char*)xbt_dynar_get_as(tokens, cursor2, char *)); */ - /* cursor2++; */ - /* xbt_dynar_free(&s_tokens); */ - /* continue; */ - /* } */ - /* addr = (void *) strtoul(xbt_dynar_get_as(s_tokens, 1, char *), NULL, 16); */ - /* if(addr > std_heap && (char *)addr <= (char *)std_heap + STD_HEAP_SIZE){ */ - /* cursor2++; */ - /* xbt_dynar_free(&s_tokens); */ - /* continue; */ - /* } */ - /* if(is_stack_ignore_variable(frame_name, xbt_dynar_get_as(s_tokens, 0, char *))){ */ - /* cursor2++; */ - /* xbt_dynar_free(&s_tokens); */ - /* continue; */ - /* } */ - /* xbt_strbuff_append(clear, (const char *)xbt_dynar_get_as(tokens, cursor2, char *)); */ - /* } */ - /* xbt_dynar_free(&s_tokens); */ - /* cursor2++; */ - /* } */ - /* xbt_dynar_free(&tokens); */ - /* cursor1++; */ - /* } */ - - /* xbt_free(frame_name); */ - - /* xbt_sha(clear->data, snapshot_hash); */ - - /* xbt_strbuff_free(clear); */ +static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame, + dw_frame_t scope, xbt_dynar_t result) +{ + void *ip = (void *) stack_frame->ip; + if (ip < scope->low_pc || ip >= scope->high_pc) + return; -} + unsigned cursor = 0; + dw_variable_t current_variable; + xbt_dynar_foreach(scope->variables, cursor, current_variable) { + if (!mc_valid_variable(current_variable, scope, (void *) stack_frame->ip)) + continue; + 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); + } else { + xbt_die("No address"); + } -static xbt_dynar_t MC_get_local_variables_values(void *stack_context){ - - unw_cursor_t c; - int ret; + xbt_dynar_push(result, &new_var); + } - 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(); + // 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, result); } +} - unw_word_t ip, sp, off; - dw_frame_t frame; +static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames) +{ - unsigned int cursor = 0; - dw_variable_t current_variable; - int region_type; - void *frame_pointer_address = NULL; - long true_ip; - int stop = 0; + unsigned cursor1 = 0; + mc_stack_frame_t stack_frame; + xbt_dynar_t variables = + xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp); - xbt_dynar_t variables = xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp); + xbt_dynar_foreach(stack_frames, cursor1, stack_frame) { + mc_fill_local_variables_values(stack_frame, stack_frame->frame, variables); + } - while(ret >= 0 && !stop){ + return variables; +} - unw_get_reg(&c, UNW_REG_IP, &ip); - unw_get_reg(&c, UNW_REG_SP, &sp); +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); + } +} - unw_get_proc_name(&c, frame_name, sizeof (frame_name), &off); +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); - if(!strcmp(frame_name, "smx_ctx_sysv_wrapper")) /* Stop before context switch with maestro */ - stop = 1; + unw_cursor_t c; - if((long)ip > (long) mc_libsimgrid_info->start_exec) - frame = xbt_dict_get_or_null(mc_libsimgrid_info->local_variables, frame_name); - else - frame = xbt_dict_get_or_null(mc_binary_info->local_variables, frame_name); + // TODO, check condition check (unw_init_local==0 means end of frame) + if (unw_init_local(&c, (unw_context_t *) stack_context) != 0) { - if(frame == NULL){ - ret = unw_step(&c); - continue; - } - - true_ip = (long)frame->low_pc + (long)off; - frame_pointer_address = mc_find_frame_base(true_ip, frame, &c); - - cursor = 0; - - xbt_dynar_foreach(frame->variables, cursor, current_variable){ - - if((long)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->frame = xbt_strdup(frame_name); - new_var->ip = (unsigned long)ip; - new_var->name = xbt_strdup(current_variable->name); - new_var->type = strdup(current_variable->type_origin); - new_var->region= region_type; - - if(current_variable->address.location != NULL){ - new_var->address = (void*) MC_dwarf_resolve_location(&c, current_variable->address.location, frame_pointer_address); - } + xbt_die("Could not initialize stack unwinding"); - xbt_dynar_push(variables, &new_var); + } else + while (1) { - } + mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1); + xbt_dynar_push(result, &stack_frame); - ret = unw_step(&c); - - } + stack_frame->unw_cursor = c; - return variables; + unw_word_t ip, 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; -static void *MC_get_stack_pointer(void *stack_context, void *heap){ + // TODO, use real addresses in frame_t instead of fixing it here - unw_cursor_t c; - int ret; - unw_word_t sp; + dw_frame_t frame = MC_find_function_by_ip((void *) ip); + stack_frame->frame = frame; + + 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; + } + + /* 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."); + } + } - ret = unw_init_local(&c, (unw_context_t *)stack_context); - if(ret < 0){ + if (xbt_dynar_length(result) == 0) { XBT_INFO("unw_init_local failed"); xbt_abort(); } - unw_get_reg(&c, UNW_REG_SP, &sp); - - return ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap))); - -} + return result; +}; -static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t *snapshot, void *heap){ +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), MC_snapshot_stack_free_voidp); + xbt_dynar_t res = + xbt_dynar_new(sizeof(s_mc_snapshot_stack_t), + MC_snapshot_stack_free_voidp); unsigned int cursor = 0; stack_region_t current_stack; - - xbt_dynar_foreach(stacks_areas, cursor, 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 = MC_get_local_variables_values(current_stack->context); - st->stack_pointer = MC_get_stack_pointer(current_stack->context, heap); - st->real_address = current_stack->address; + st->stack_frames = MC_unwind_stack_frames(current_stack->context); + st->local_variables = MC_get_local_variables_values(st->stack_frames); + + 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] = current_stack->size - ((char *)st->stack_pointer - (char *)((char *)heap + ((char *)current_stack->address - (char *)std_heap))); + (*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 xbt_dynar_t MC_take_snapshot_ignore(){ - - if(mc_heap_comparison_ignore == NULL) +static xbt_dynar_t MC_take_snapshot_ignore() +{ + + if (mc_heap_comparison_ignore == NULL) return NULL; - xbt_dynar_t cpy = xbt_dynar_new(sizeof(mc_heap_ignore_region_t), heap_ignore_region_free_voidp); + 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){ + 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; @@ -572,68 +518,133 @@ static xbt_dynar_t MC_take_snapshot_ignore(){ } -static void MC_dump_checkpoint_ignore(mc_snapshot_t snapshot){ - +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 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; - size_t offset; - - xbt_dynar_foreach(mc_checkpoint_ignore, cursor, region){ - if(region->addr > snapshot->regions[0]->start_addr && (char *)(region->addr) < (char *)snapshot->regions[0]->start_addr + STD_HEAP_SIZE){ - offset = (char *)region->addr - (char *)snapshot->regions[0]->start_addr; - memset((char *)snapshot->regions[0]->data + offset, 0, region->size); - }else if(region->addr > snapshot->regions[2]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[2]->start_addr + snapshot->regions[2]->size){ - offset = (char *)region->addr - (char *)snapshot->regions[2]->start_addr; - memset((char *)snapshot->regions[2]->data + offset, 0, region->size); - }else if(region->addr > snapshot->regions[1]->start_addr && (char *)(region->addr) < (char*)snapshot->regions[1]->start_addr + snapshot->regions[1]->size){ - offset = (char *)region->addr - (char *)snapshot->regions[1]->start_addr; - memset((char *)snapshot->regions[1]->data + offset, 0, region->size); - } + 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); + } + + // Zero the memory: + xbt_dynar_foreach (mc_checkpoint_ignore, cursor, region) { + memset(region->addr, 0, region->size); } } +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); + } +} -mc_snapshot_t MC_take_snapshot(int num_state){ +/** @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 (_sg_mc_sparse_checkpoint && snapshot == mc_model_checker->parent_snapshot) + return true; + + return false; +} + +mc_snapshot_t MC_take_snapshot(int num_state) +{ mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1); - snapshot->nb_processes = xbt_swag_size(simix_global->process_list); - if(MC_USE_SNAPSHOT_HASH) { - snapshot->hash = mc_hash_processes_state(num_state); - } else { - snapshot->hash = 0; + 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); } + MC_snapshot_handle_ignore(snapshot); + /* 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(); + } snapshot->to_ignore = MC_take_snapshot_ignore(); - if(_sg_mc_visited > 0 || strcmp(_sg_mc_property_file,"")){ - snapshot->stacks = MC_take_snapshot_stacks(&snapshot, snapshot->regions[0]->data); - //MC_get_hash_global(snapshot->hash_global, snapshot->regions[1]->data, snapshot->regions[2]->data); - //MC_get_hash_local(snapshot->hash_local, snapshot->stacks); + 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; + } + } else { + snapshot->hash = 0; } - if(num_state > 0) - MC_dump_checkpoint_ignore(snapshot); - + MC_snapshot_ignore_restore(snapshot); + mc_model_checker->parent_snapshot = snapshot; return snapshot; - } -void MC_restore_snapshot(mc_snapshot_t snapshot){ +void MC_restore_snapshot(mc_snapshot_t snapshot) +{ + mc_snapshot_t parent_snapshot = mc_model_checker->parent_snapshot; + unsigned int i; - for(i=0; i < NB_REGIONS; i++){ - MC_region_restore(snapshot->regions[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); } + if (snapshot->privatization_regions) { + for (i = 0; i < SIMIX_process_count(); i++) { + if (snapshot->privatization_regions[i]) { + MC_region_restore(snapshot->privatization_regions[i], + parent_snapshot ? parent_snapshot->privatization_regions[i] : NULL); + } + } + switch_data_segment(snapshot->privatization_index); + } + + if (_sg_mc_sparse_checkpoint && _sg_mc_soft_dirty) { + mc_softdirty_reset(); + } + + MC_snapshot_ignore_restore(snapshot); + mc_model_checker->parent_snapshot = snapshot; } -mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){ +mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall) +{ return MC_take_snapshot(1); } -void *MC_snapshot(void){ +void *MC_snapshot(void) +{ return simcall_mc_snapshot(); }