-/* 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 <string.h>
#include <link.h>
#include "mc_private.h"
#include "xbt/module.h"
#include <xbt/mmalloc.h>
+#include "xbt/mmalloc/mmprivate.h"
+
#include "../simix/smx_private.h"
#include <libunwind.h>
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){
xbt_dynar_free(&(s->local_variables));
+ xbt_dynar_free(&(s->stack_frames));
xbt_free(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);
}
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);
- }
- }
- }
- }
-
- }
-
- free(line);
- fclose(fp);
+ 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);
+ MC_snapshot_add_region(snapshot, 2, mc_binary_info->start_rw, mc_binary_info->end_rw - mc_binary_info->start_rw);
}
/** @brief Finds the range of the different memory segments and binary paths */
// 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;
}
}
-/** \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) {
+void MC_find_object_address(memory_map_t maps, mc_object_info_t result) {
unsigned int i = 0;
s_map_region_t reg;
maps->regions[i].pathname);
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;
+ }
} else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)){
xbt_assert(!result->start_exec,
"Multiple executable segments for %s, not supported",
/************************************* Take Snapshot ************************************/
/****************************************************************************************/
-static xbt_dynar_t MC_get_local_variables_values(void *stack_context){
-
- unw_cursor_t c;
- int ret;
-
- 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();
- }
-
- unw_word_t ip, sp, off;
- dw_frame_t frame;
+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;
+}
- unsigned int cursor = 0;
- dw_variable_t current_variable;
- int region_type;
- void *frame_pointer_address = NULL;
- long true_ip;
- int stop = 0;
+static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames){
+ unsigned cursor1 = 0;
+ mc_stack_frame_t stack_frame;
xbt_dynar_t variables = xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
- while(ret >= 0 && !stop){
-
- 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);
-
- if(!strcmp(frame_name, "smx_ctx_sysv_wrapper")) /* Stop before context switch with maestro */
- stop = 1;
-
- 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);
-
- 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(stack_frames,cursor1,stack_frame) {
- xbt_dynar_foreach(frame->variables, cursor, current_variable){
+ unsigned cursor2 = 0;
+ dw_variable_t current_variable;
+ xbt_dynar_foreach(stack_frame->frame->variables, cursor2, current_variable){
- if((long)ip > (long)mc_libsimgrid_info->start_exec)
+ 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->frame = xbt_strdup(frame_name);
- new_var->ip = (unsigned long)ip;
+ 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->type = current_variable->type;
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(&c, current_variable->location, frame_pointer_address);
+ 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(variables, &new_var);
}
-
- ret = unw_step(&c);
-
}
return variables;
}
+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);
+ }
+}
-static void *MC_get_stack_pointer(void *stack_context, void *heap){
+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);
unw_cursor_t c;
+
int ret;
- unw_word_t sp;
+ 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);
+ xbt_dynar_push(result, &stack_frame);
+
+ stack_frame->unw_cursor = c;
+
+ 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;
+
+ // 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;
- ret = unw_init_local(&c, (unw_context_t *)stack_context);
- if(ret < 0){
+ 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(frame!=NULL && frame->name!=NULL && !strcmp(frame->name, "smx_ctx_sysv_wrapper"))
+ break;
+ }
+
+ 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){
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->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;
+ st->stack_pointer = ((char *)heap + (size_t)(((char *)((long)sp) - (char*)std_heap)));
+
st->real_address = current_stack->address;
xbt_dynar_push(res, &st);
(*snapshot)->stack_sizes = xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
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;
- }
/* Save the std heap and the writable mapped pages of libsimgrid and binary */
MC_get_memory_regions(snapshot);
if(_sg_mc_visited > 0 || strcmp(_sg_mc_property_file,"")){
snapshot->stacks = MC_take_snapshot_stacks(&snapshot, snapshot->regions[0]->data);
+ 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)
}
+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;
+}
+
mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall){
return MC_take_snapshot(1);
}