+ case DW_OP_const1s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 1;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const2s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 2;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const4s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 4;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const8s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 8;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ default:
+ element->type = e_dw_unsupported;
+ break;
+ }
+ return element;
+}
+
+/** \brief Convert libdw location expresion into native one */
+static dw_location_t MC_dwarf_get_expression(Dwarf_Op* expr, size_t len) {
+ dw_location_t loc = xbt_new0(s_dw_location_t, 1);
+ loc->type = e_dw_compose;
+ loc->location.compose = xbt_dynar_new(sizeof(dw_location_t), NULL);
+
+ int i;
+ for (i=0; i!=len; ++i) {
+ dw_location_t element = MC_dwarf_get_expression_element(expr+i);
+ if (element)
+ xbt_dynar_push(loc->location.compose, &element);
+ }
+
+ return loc;
+}
+
+static int mc_anonymous_variable_index = 0;
+
+static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
+ // Drop declaration:
+ if (MC_dwarf_attr_flag(die, DW_AT_declaration, false))
+ return NULL;
+
+ Dwarf_Attribute attr_location;
+ if (dwarf_attr(die, DW_AT_location, &attr_location)==NULL) {
+ // No location: do not add it ?
+ return NULL;
+ }
+
+ dw_variable_t variable = xbt_new0(s_dw_variable_t, 1);
+ variable->dwarf_offset = dwarf_dieoffset(die);
+ variable->global = frame == NULL; // Can be override base on DW_AT_location
+ variable->name = xbt_strdup(MC_dwarf_attr_string(die, DW_AT_name));
+ variable->type_origin = MC_dwarf_at_type(die);
+
+ int klass = MC_dwarf_form_get_class(dwarf_whatform(&attr_location));
+ switch (klass) {
+ case MC_DW_CLASS_EXPRLOC:
+ case MC_DW_CLASS_BLOCK:
+ // Location expression:
+ {
+ Dwarf_Op* expr;
+ size_t len;
+ if (dwarf_getlocation(&attr_location, &expr, &len)) {
+ xbt_die(
+ "Could not read location expression in DW_AT_location of variable <%p>%s",
+ (void*) variable->dwarf_offset, variable->name);
+ }
+
+ if (len==1 && expr[0].atom == DW_OP_addr) {
+ variable->global = 1;
+ Dwarf_Off offset = expr[0].number;
+ // TODO, Why is this different base on the object?
+ Dwarf_Off base = strcmp(info->file_name, xbt_binary_name) !=0 ? (Dwarf_Off) info->start_exec : 0;
+ variable->address = (void*) (base + offset);
+ } else {
+ variable->location = MC_dwarf_get_expression(expr, len);
+ }
+
+ break;
+ }
+ case MC_DW_CLASS_LOCLISTPTR:
+ case MC_DW_CLASS_CONSTANT:
+ // Reference to location list:
+ variable->location = MC_dwarf_get_location_list(info, die, &attr_location);
+ break;
+ default:
+ xbt_die("Unexpected calss 0x%x (%i) list for location in <%p>%s",
+ klass, klass, (void*) variable->dwarf_offset, variable->name);
+ }
+
+ // The current code needs a variable name,
+ // generate a fake one:
+ if(!variable->name) {
+ variable->name = bprintf("@anonymous#%i", mc_anonymous_variable_index++);
+ }
+
+ return variable;
+}
+
+static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
+ dw_variable_t variable = MC_die_to_variable(info, die, unit, frame);
+ if(variable==NULL)
+ return;
+ MC_dwarf_register_variable(info, frame, variable);
+}
+
+static void MC_dwarf_handle_subprogram_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t parent_frame) {
+ dw_frame_t frame = xbt_new0(s_dw_frame_t, 1);
+
+ frame->start = dwarf_dieoffset(die);
+
+ const char* name = MC_dwarf_at_linkage_name(die);
+ if (name==NULL)
+ name = MC_dwarf_attr_string(die, DW_AT_name);
+ frame->name = xbt_strdup(name);
+
+ // This is the base address for DWARF addresses.
+ // Relocated addresses are offset from this base address.
+ // See DWARF4 spec 7.5
+ void* base = info->flags & MC_OBJECT_INFO_EXECUTABLE ? 0 : MC_object_base_address(info);
+
+ // Variables are filled in the (recursive) call of MC_dwarf_handle_children:
+ frame->variables = xbt_dynar_new(sizeof(dw_variable_t), dw_variable_free_voidp);
+ frame->high_pc = ((char*) base) + MC_dwarf_attr_addr(die, DW_AT_high_pc);
+ frame->low_pc = ((char*) base) + MC_dwarf_attr_addr(die, DW_AT_low_pc);
+ frame->frame_base = MC_dwarf_at_location(info, die, DW_AT_frame_base);
+ frame->end = -1; // This one is now useless:
+
+ // Handle children:
+ MC_dwarf_handle_children(info, die, unit, frame);
+
+ // Register it:
+ xbt_dynar_push(info->subprograms, &frame);
+}
+
+static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {