#include "mc_private.h"
#include "xbt/module.h"
#include <xbt/mmalloc.h>
+#include "../smpi/private.h"
#include "xbt/mmalloc/mmprivate.h"
}
static void local_variable_free(local_variable_t v){
- xbt_free(v->frame);
xbt_free(v->name);
xbt_free(v);
}
static void MC_region_destroy(mc_mem_region_t reg)
{
+ //munmap(reg->data, reg->size);
xbt_free(reg->data);
xbt_free(reg);
}
xbt_free(snapshot->stack_sizes);
xbt_dynar_free(&(snapshot->stacks));
xbt_dynar_free(&(snapshot->to_ignore));
+
+ if(snapshot->privatization_regions){
+ size_t n = snapshot->nb_processes;
+ for(i=0; i!=n; ++i) {
+ MC_region_destroy(snapshot->privatization_regions[i]);
+ }
+ xbt_free(snapshot->privatization_regions);
+ }
+
xbt_free(snapshot);
}
mc_mem_region_t new_reg = xbt_new(s_mc_mem_region_t, 1);
new_reg->start_addr = start_addr;
new_reg->size = size;
+ //new_reg->data = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+ //if(new_reg->data==MAP_FAILED)
+ //xbt_die("Could not mmap new memory for snapshot.");
new_reg->data = xbt_malloc(size);
memcpy(new_reg->data, start_addr, size);
+ //madvise(new_reg->data, size, MADV_MERGEABLE);
XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu", type, new_reg->data, start_addr, size);
}
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;
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);
+ 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++){
+ snapshot->privatization_regions[i] = MC_region_new(-1, mappings[i], size_data_exe);
+ }
+ snapshot->privatization_index = loaded_page;
+ }
}
/** @brief Finds the range of the different memory segments and binary paths */
}
-/** \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) {
// 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
}
void MC_post_process_types(mc_object_info_t info) {
}
}
-/** \brief Fills the position of the .bss and .data sections. */
+/** \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;
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;
/************************************* Take Snapshot ************************************/
/****************************************************************************************/
-static bool mc_valid_variable(dw_variable_t var, dw_frame_t frame, const void* ip) {
+/** \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*) frame->low_pc + var->start_scope) > ip)
+ if((const void*)((const char*) scope->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, 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");
+ }
+
+ 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;
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){
-
- 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(stack_frame->frame_name);
- 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->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){
unw_cursor_t c;
- dw_frame_t test = MC_find_function_by_ip(&MC_unwind_stack_frames);
- xbt_assert(test);
+ // TODO, check condition check (unw_init_local==0 means end of frame)
+ if(unw_init_local(&c, (unw_context_t *)stack_context)!=0) {
+
+ xbt_die("Could not initialize stack unwinding");
+
+ } else while(1) {
- 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);
xbt_dynar_push(result, &stack_frame);
if(frame) {
stack_frame->frame_name = xbt_strdup(frame->name);
- stack_frame->frame_base = (unw_word_t)mc_find_frame_base((void*)ip, frame, &c);
+ 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.");
+ }
}
if(xbt_dynar_length(result) == 0){
if(num_state > 0)
MC_dump_checkpoint_ignore(snapshot);
+ // mprotect the region after zero-ing ignored parts:
+ /*size_t i;
+ for(i=0; i!=NB_REGIONS; ++i) {
+ mc_mem_region_t region = snapshot->regions[i];
+ mprotect(region->data, region->size, PROT_READ);
+ }*/
+
return snapshot;
}
void MC_restore_snapshot(mc_snapshot_t snapshot){
unsigned int i;
for(i=0; i < NB_REGIONS; i++){
- MC_region_restore(snapshot->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]);
+ }
+
+ if(snapshot->privatization_regions) {
+ for (i=0; i< SIMIX_process_count(); i++){
+ if(snapshot->privatization_regions[i]) {
+ MC_region_restore(snapshot->privatization_regions[i]);
+ }
+ }
+ switch_data_segment(snapshot->privatization_index);
+ }
+}
+
+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){
