X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/5cfe9640de432d43bcf40b910dba3c3f7a3599fc..c9b5c4107389722899efcee79bc56d8181a621fa:/src/mc/mc_checkpoint.c diff --git a/src/mc/mc_checkpoint.c b/src/mc/mc_checkpoint.c index 260728c323..c57a4f5750 100644 --- a/src/mc/mc_checkpoint.c +++ b/src/mc/mc_checkpoint.c @@ -1,4 +1,4 @@ -/* 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 @@ -27,8 +27,6 @@ XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc, char *libsimgrid_path; -static void MC_find_object_address(memory_map_t maps, mc_object_info_t result); - /************************************ Free functions **************************************/ /*****************************************************************************************/ @@ -45,9 +43,7 @@ static void MC_snapshot_stack_free_voidp(void *s){ } static void local_variable_free(local_variable_t v){ - xbt_free(v->frame); xbt_free(v->name); - xbt_free(v->type); xbt_free(v); } @@ -150,7 +146,7 @@ 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) { @@ -166,15 +162,14 @@ static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type) { // 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); + 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; @@ -191,18 +186,11 @@ static void MC_post_process_types(mc_object_info_t info) { } } -/** \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; @@ -219,7 +207,6 @@ static void MC_find_object_address(memory_map_t maps, mc_object_info_t result) { result->start_rw = reg.start_addr; result->end_rw = reg.end_addr; // .bss is usually after the .data: - // TODO, use dl_iterate_phdr to be more robust 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; @@ -249,6 +236,66 @@ static void MC_find_object_address(memory_map_t maps, mc_object_info_t result) { /************************************* 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 frame, const void* ip) { + // The variable is not yet valid: + if((const void*)((const char*) frame->low_pc + var->start_scope) > ip) + return false; + else + return true; +} + +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, stack_frame->frame, (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, + &(stack_frame->unw_cursor), (void*)stack_frame->frame_base, NULL); + } + + xbt_dynar_push(result, &new_var); + } + + // 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); + } +} + static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames){ unsigned cursor1 = 0; @@ -256,39 +303,10 @@ static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames){ xbt_dynar_t variables = xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp); xbt_dynar_foreach(stack_frames,cursor1,stack_frame) { - - unsigned cursor2 = 0; - dw_variable_t current_variable; - xbt_dynar_foreach(stack_frame->frame->variables, cursor2, current_variable){ - - 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->frame = xbt_strdup(stack_frame->frame_name); - new_var->ip = stack_frame->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!=NULL) { - new_var->address = current_variable->address; - } else */ - if(current_variable->location != NULL){ - new_var->address = (void*) MC_dwarf_resolve_location( - &(stack_frame->unw_cursor), current_variable->location, (void*)stack_frame->frame_base); - } - - xbt_dynar_push(variables, &new_var); - - } + mc_fill_local_variables_values(stack_frame, stack_frame->frame, variables); } return variables; - } static void MC_stack_frame_free_voipd(void *s){ @@ -304,8 +322,6 @@ static xbt_dynar_t MC_unwind_stack_frames(void *stack_context) { unw_cursor_t c; - char frame_name[256]; - int ret; for(ret = unw_init_local(&c, (unw_context_t *)stack_context); ret >= 0; ret = unw_step(&c)){ mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1); @@ -313,29 +329,28 @@ static xbt_dynar_t MC_unwind_stack_frames(void *stack_context) { stack_frame->unw_cursor = c; - unw_get_reg(&c, UNW_REG_IP, &stack_frame->ip); - unw_get_reg(&c, UNW_REG_SP, &stack_frame->sp); + unw_word_t ip, sp; - unw_word_t off; - unw_get_proc_name(&c, frame_name, sizeof (frame_name), &off); - stack_frame->frame_name = xbt_strdup(frame_name); + unw_get_reg(&c, UNW_REG_IP, &ip); + unw_get_reg(&c, UNW_REG_SP, &sp); - dw_frame_t frame; - if((long)stack_frame->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); + stack_frame->ip = ip; + stack_frame->sp = sp; + + // TODO, use real addresses in frame_t instead of fixing it here + + dw_frame_t frame = MC_find_function_by_ip((void*) ip); stack_frame->frame = frame; - if(frame != NULL){ - unw_word_t normalized_ip = (unw_word_t)frame->low_pc + (unw_word_t)off; - stack_frame->frame_base = (unw_word_t)mc_find_frame_base(normalized_ip, frame, &c); + if(frame) { + stack_frame->frame_name = xbt_strdup(frame->name); + stack_frame->frame_base = (unw_word_t)mc_find_frame_base(frame, &c); } else { stack_frame->frame_base = 0; } /* Stop before context switch with maestro */ - if(!strcmp(frame_name, "smx_ctx_sysv_wrapper")) + if(frame!=NULL && frame->name!=NULL && !strcmp(frame->name, "smx_ctx_sysv_wrapper")) break; } @@ -455,6 +470,47 @@ void MC_restore_snapshot(mc_snapshot_t snapshot){ } +void* mc_translate_address(uintptr_t addr, mc_snapshot_t snapshot) { + + // If not in a process state/clone: + if(!snapshot) { + return (uintptr_t*) addr; + } + + // If it is in a snapshot: + for(size_t i=0; i!=NB_REGIONS; ++i) { + mc_mem_region_t region = snapshot->regions[i]; + uintptr_t start = (uintptr_t) region->start_addr; + uintptr_t end = start + region->size; + + // The address is in this region: + if(addr >= start && addr < end) { + uintptr_t offset = addr - start; + return (void*) ((uintptr_t)region->data + offset); + } + + } + + // It is not in a snapshot: + return (void*) addr; +} + +uintptr_t mc_untranslate_address(void* addr, mc_snapshot_t snapshot) { + if(!snapshot) { + return (uintptr_t) addr; + } + + for(size_t i=0; i!=NB_REGIONS; ++i) { + mc_mem_region_t region = snapshot->regions[i]; + if(addr>=region->data && addr<=(void*)(((char*)region->data)+region->size)) { + size_t offset = (size_t) ((char*) addr - (char*) region->data); + return ((uintptr_t) region->start_addr) + offset; + } + } + + return (uintptr_t) addr; +} + mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){ return MC_take_snapshot(1); }