-/* 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 <libgen.h>
+#define _GNU_SOURCE
+#define UNW_LOCAL_ONLY
+
+
+#include <string.h>
+#include <link.h>
+
+#include "internal_config.h"
#include "mc_private.h"
#include "xbt/module.h"
+#include <xbt/mmalloc.h>
+#include "../smpi/private.h"
+#include <alloca.h>
+
+#include "xbt/mmalloc/mmprivate.h"
#include "../simix/smx_private.h"
#include <libunwind.h>
+#include <libelf.h>
+
+#include "mc_private.h"
+#include <mc/mc.h>
+
+#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_got_plt_libsimgrid, *end_got_plt_libsimgrid;
-void *start_plt_binary, *end_plt_binary;
-void *start_got_plt_binary, *end_got_plt_binary;
char *libsimgrid_path;
-void *start_data_libsimgrid, *start_bss_libsimgrid;
-void *start_data_binary, *start_bss_binary;
-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);
+/************************************ Free functions **************************************/
+/*****************************************************************************************/
+
+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_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size);
+static void MC_snapshot_stack_free_voidp(void *s)
+{
+ MC_snapshot_stack_free((mc_snapshot_stack_t) * (void **) s);
+}
-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);
+static void local_variable_free(local_variable_t v)
+{
+ xbt_free(v->name);
+ xbt_free(v);
+}
-static void snapshot_stack_free(mc_snapshot_stack_t s);
+static void local_variable_free_voidp(void *v)
+{
+ local_variable_free((local_variable_t) * (void **) v);
+}
-static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size)
+void MC_region_destroy(mc_mem_region_t reg)
{
- mc_mem_region_t new_reg = xbt_new0(s_mc_mem_region_t, 1);
- new_reg->type = type;
+ 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);
+}
+
+void MC_free_snapshot(mc_snapshot_t snapshot)
+{
+ unsigned int 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_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->data = xbt_malloc0(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);
-
+ 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;
+
+}
+
+/** @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);
+ }
}
-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->permanent_addr, reg->data, reg->size);
+ } else {
+ mc_region_restore_sparse(reg, ref_reg);
+ }
return;
}
-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, void* permanent_addr, size_t size)
+
{
- xbt_free(reg->data);
- xbt_free(reg);
+ 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;
}
-static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size)
+static void MC_get_memory_regions(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;
-}
-void MC_init_memory_map_info(){
+ 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;
+ }
+}
- int raw_mem_set = (mmalloc_get_current_heap() == raw_heap);
+/** @brief Finds the range of the different memory segments and binary paths */
+void MC_init_memory_map_info()
+{
- MC_SET_RAW_MEM;
-
unsigned int i = 0;
s_map_region_t reg;
- memory_map_t maps = get_memory_map();
+ memory_map_t maps = MC_get_memory_map();
+
+ maestro_stack_start = NULL;
+ maestro_stack_end = NULL;
+ libsimgrid_path = NULL;
while (i < maps->mapsize) {
reg = maps->regions[i];
- if ((reg.prot & PROT_WRITE)){
- if (maps->regions[i].pathname != NULL){
- if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
- start_data_libsimgrid = reg.start_addr;
- i++;
- reg = maps->regions[i];
- if(reg.pathname == NULL && (reg.prot & PROT_WRITE) && i < maps->mapsize)
- start_bss_libsimgrid = reg.start_addr;
- }else if (!memcmp(basename(maps->regions[i].pathname), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){
- start_data_binary = reg.start_addr;
- i++;
- reg = maps->regions[i];
- if(reg.pathname == NULL && (reg.prot & PROT_WRITE) && reg.start_addr != std_heap && reg.start_addr != raw_heap && i < maps->mapsize){
- start_bss_binary = reg.start_addr;
- i++;
- }
- }else if(!memcmp(maps->regions[i].pathname, "[heap]", 6)){
- end_raw_heap = reg.end_addr;
- i++;
- }
- }
- }else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)){
- 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;
- }
- }
+ 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++;
}
-
- 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;
+ MC_free_memory_map(maps);
}
-mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){
- return MC_take_snapshot();
+/** \brief Fill/lookup the "subtype" field.
+ */
+static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type)
+{
+
+ 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;
+ }
+
}
-mc_snapshot_t MC_take_snapshot()
+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) {
+ 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);
+ }
+ }
+}
- int raw_mem = (mmalloc_get_current_heap() == raw_heap);
-
- MC_SET_RAW_MEM;
-
- mc_snapshot_t snapshot = xbt_new0(s_mc_snapshot_t, 1);
+/** \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;
- memory_map_t maps = get_memory_map();
- int nb_reg = 0;
- void *heap = NULL;
- size_t size = 0;
- void *start = NULL;
-
- /* Save the std heap and the writable mapped pages of libsimgrid */
+ const char *name = basename(result->file_name);
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++;
- }
- i++;
- } else{
- if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
- size = (char*)reg.end_addr - (char*)reg.start_addr;
- start = reg.start_addr;
- nb_reg++;
- i++;
- reg = maps->regions[i];
- if(reg.pathname == NULL && (reg.prot & PROT_WRITE) && i < maps->mapsize){
- size += (char*)reg.end_addr - (char*)reg.start_addr;
- reg = maps->regions[i];
- i++;
- }
- MC_snapshot_add_region(snapshot, 1, start, size);
- }else if(!memcmp(maps->regions[i].pathname, "[heap]", 6)){
- end_raw_heap = reg.end_addr;
- i++;
- } else if (!memcmp(basename(maps->regions[i].pathname), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){
- size = (char*)reg.end_addr - (char*)reg.start_addr;
- start = reg.start_addr;
- nb_reg++;
- i++;
- reg = maps->regions[i];
- if(reg.pathname == NULL && (reg.prot & PROT_WRITE) && reg.start_addr != std_heap && reg.start_addr != raw_heap && i < maps->mapsize){
- size += (char*)reg.end_addr - (char*)reg.start_addr;
- reg = maps->regions[i];
- i++;
- }
- MC_snapshot_add_region(snapshot, 2, start, size);
- }else{
- 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{
- i++;
+ } 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++;
}
- if(_sg_mc_visited > 0 || strcmp(_sg_mc_property_file,""))
- snapshot->stacks = take_snapshot_stacks(heap);
-
- free_memory_map(maps);
-
- MC_UNSET_RAW_MEM;
-
- if(raw_mem)
- MC_SET_RAW_MEM;
-
- return snapshot;
-
+ xbt_assert(result->file_name);
+ xbt_assert(result->start_rw);
+ xbt_assert(result->start_exec);
}
-void MC_restore_snapshot(mc_snapshot_t snapshot)
+/************************************* 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)
{
- unsigned int i;
- for(i=0; i < snapshot->num_reg; i++){
- MC_region_restore(snapshot->regions[i]);
- }
-
+ // The variable is not yet valid:
+ if ((const void *) ((const char *) scope->low_pc + var->start_scope) > ip)
+ return false;
+ else
+ return true;
}
-void MC_free_snapshot(mc_snapshot_t snapshot)
+static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame,
+ dw_frame_t scope, int process_index, xbt_dynar_t result)
{
- unsigned int i;
- for(i=0; i < snapshot->num_reg; i++)
- MC_region_destroy(snapshot->regions[i]);
+ void *ip = (void *) stack_frame->ip;
+ if (ip < scope->low_pc || ip >= scope->high_pc)
+ return;
- xbt_dynar_free(&(snapshot->stacks));
- xbt_free(snapshot);
-}
+ 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;
-void get_libsimgrid_plt_section(){
+ 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");
+ }
- 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 */
+ xbt_dynar_push(result, &new_var);
+ }
- char *lfields[7];
- int i, plt_found = 0;
- unsigned long int size, offset;
+ // 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);
+ }
+}
- char *command = bprintf("objdump --section-headers %s", libsimgrid_path);
+static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames, int process_index)
+{
- fp = popen(command, "r");
+ 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(fp == NULL){
- perror("popen failed");
- xbt_abort();
+ xbt_dynar_foreach(stack_frames, cursor1, stack_frame) {
+ mc_fill_local_variables_values(stack_frame, stack_frame->frame, process_index, variables);
}
- while ((read = getline(&line, &n, fp)) != -1 && plt_found != 2) {
+ return variables;
+}
- if(n == 0)
- continue;
+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);
+ }
+}
- /* Wipeout the new line character */
- line[read - 1] = '\0';
+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);
- lfields[0] = strtok(line, " ");
+ unw_cursor_t c;
- if(lfields[0] == NULL)
- continue;
+ // TODO, check condition check (unw_init_local==0 means end of frame)
+ if (unw_init_local(&c, (unw_context_t *) stack_context) != 0) {
- if(strcmp(lfields[0], "Sections:") == 0 || strcmp(lfields[0], "Idx") == 0 || strncmp(lfields[0], libsimgrid_path, strlen(libsimgrid_path)) == 0)
- continue;
+ xbt_die("Could not initialize stack unwinding");
- for (i = 1; i < 7 && lfields[i - 1] != NULL; i++) {
- lfields[i] = strtok(NULL, " ");
- }
+ } else
+ while (1) {
- 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_found++;
- }else if(strcmp(lfields[1], ".got.plt") == 0){
- size = strtoul(lfields[2], NULL, 16);
- offset = strtoul(lfields[5], NULL, 16);
- start_got_plt_libsimgrid = (char *)start_text_libsimgrid + offset;
- end_got_plt_libsimgrid = (char *)start_got_plt_libsimgrid + size;
- plt_found++;
- }
+ mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
+ xbt_dynar_push(result, &stack_frame);
- }
-
- }
+ stack_frame->unw_cursor = c;
- free(command);
- free(line);
- pclose(fp);
+ unw_word_t ip, sp;
-}
+ unw_get_reg(&c, UNW_REG_IP, &ip);
+ unw_get_reg(&c, UNW_REG_SP, &sp);
-void get_binary_plt_section(){
+ stack_frame->ip = ip;
+ stack_frame->sp = sp;
- 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 */
+ // TODO, use real addresses in frame_t instead of fixing it here
- char *lfields[7];
- int i, plt_found = 0;
- unsigned long int size;
+ dw_frame_t frame = MC_find_function_by_ip((void *) ip);
+ stack_frame->frame = frame;
- char *command = bprintf( "objdump --section-headers %s", xbt_binary_name);
+ 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;
- fp = popen(command, "r");
+ 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.");
+ }
+ }
- if(fp == NULL){
- perror("popen failed");
+ if (xbt_dynar_length(result) == 0) {
+ XBT_INFO("unw_init_local failed");
xbt_abort();
}
- while ((read = getline(&line, &n, fp)) != -1 && plt_found != 2) {
+ return result;
+};
- if(n == 0)
- continue;
-
- /* Wipeout the new line character */
- line[read - 1] = '\0';
+static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t * snapshot)
+{
- lfields[0] = strtok(line, " ");
+ xbt_dynar_t res =
+ xbt_dynar_new(sizeof(s_mc_snapshot_stack_t),
+ MC_snapshot_stack_free_voidp);
- if(lfields[0] == NULL)
- continue;
+ unsigned int cursor = 0;
+ stack_region_t current_stack;
- if(strcmp(lfields[0], "Sections:") == 0 || strcmp(lfields[0], "Idx") == 0 || strncmp(lfields[0], basename(xbt_binary_name), strlen(xbt_binary_name)) == 0)
- continue;
+ xbt_dynar_foreach(stacks_areas, cursor, current_stack) {
+ mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
+ 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;
- for (i = 1; i < 7 && lfields[i - 1] != NULL; i++) {
- lfields[i] = strtok(NULL, " ");
- }
+ unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
- if(i>=6){
- if(strcmp(lfields[1], ".plt") == 0){
- size = strtoul(lfields[2], NULL, 16);
- start_plt_binary = (void *)strtoul(lfields[3], NULL, 16);
- end_plt_binary = (char *)start_plt_binary + size;
- plt_found++;
- }else if(strcmp(lfields[1], ".got.plt") == 0){
- size = strtoul(lfields[2], NULL, 16);
- start_got_plt_binary = (char *)strtoul(lfields[3], NULL, 16);
- end_got_plt_binary = (char *)start_got_plt_binary + size;
- plt_found++;
- }
- }
-
-
+ 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;
}
- free(command);
- free(line);
- pclose(fp);
+ return res;
}
-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;
- }
- xbt_dynar_push(*list, &value);
-}
+static xbt_dynar_t MC_take_snapshot_ignore()
+{
-static xbt_dynar_t take_snapshot_stacks(void *heap){
+ if (mc_heap_comparison_ignore == NULL)
+ return NULL;
- xbt_dynar_t res = xbt_dynar_new(sizeof(s_mc_snapshot_stack_t), NULL);
+ xbt_dynar_t cpy =
+ xbt_dynar_new(sizeof(mc_heap_ignore_region_t),
+ heap_ignore_region_free_voidp);
- unsigned int cursor1 = 0;
- stack_region_t current_stack;
-
- xbt_dynar_foreach(stacks_areas, cursor1, 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);
- xbt_dynar_push(res, &st);
+ 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);
}
- return res;
+ return cpy;
}
-static void *get_stack_pointer(void *stack_context, void *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);
+}
- unw_cursor_t c;
- int ret;
- unw_word_t sp;
+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);
+ }
- 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);
}
- unw_get_reg(&c, UNW_REG_SP, &sp);
+}
+
+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);
+ }
+}
- return ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap)));
+/** @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;
+ return false;
}
-static xbt_strbuff_t get_local_variables_values(void *stack_context, void *heap){
-
- unw_cursor_t c;
- int ret;
+mc_snapshot_t MC_take_snapshot(int num_state)
+{
- 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();
+ 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);
}
- unw_word_t ip, sp, off;
- dw_frame_t frame;
-
- xbt_dynar_t compose = xbt_dynar_new(sizeof(variable_value_t), NULL);
-
- 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;
-
- while(ret >= 0){
-
- unw_get_reg(&c, UNW_REG_IP, &ip);
- unw_get_reg(&c, UNW_REG_SP, &sp);
-
- unw_get_proc_name(&c, frame_name, sizeof (frame_name), &off);
-
- frame = xbt_dict_get_or_null(mc_local_variables, frame_name);
-
- if(frame == NULL)
- return variables;
-
- xbt_strbuff_append(variables, bprintf("ip=%s\n", frame_name));
-
- 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;
- }
+ MC_snapshot_handle_ignore(snapshot);
- frame_found = 0;
- cursor = 0;
-
- 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_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((long)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1,variable_value_t)->value.address < 0 || *((void**)xbt_dynar_get_as(compose, xbt_dynar_length(compose) - 1,variable_value_t)->value.address) == NULL){
- 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_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_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_strbuff_append(variables, bprintf("%s=undefined\n", current_variable->name));
- }
- break;
- default :
- break;
- }
- }else{
- xbt_strbuff_append(variables, bprintf("%s=undefined\n", current_variable->name));
- }
- }
-
- ret = unw_step(&c);
-
+ /* 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();
}
- return variables;
+ snapshot->to_ignore = MC_take_snapshot_ignore();
+
+ 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;
+ }
+ 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){
-
+void *MC_snapshot(void)
+{
return simcall_mc_snapshot();
-
}
