1 /* Copyright (c) 2008-2013. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include <elfutils/libdw.h>
12 #include <simgrid_config.h>
14 #include <xbt/sysdep.h>
16 #include "mc_private.h"
18 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_dwarf, mc, "DWARF processing");
20 /** \brief The default DW_TAG_lower_bound for a given DW_AT_language.
22 * The default for a given language is defined in the DWARF spec.
24 static uint64_t MC_dwarf_default_lower_bound(int lang);
26 static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit);
28 /** \brief Computes the number of elements of a given DW_TAG_array_type
31 static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit);
33 /** \brief Checks if a given tag is a (known) type tag.
35 static int MC_dwarf_tag_type(int tag);
36 static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame);
37 static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit);
38 static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame);
39 static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame);
40 static dw_location_t MC_dwarf_get_expression(Dwarf_Op* expr, size_t len);
41 static Dwarf_Die* MC_dwarf_resolve_die(Dwarf_Die* die, int attribute);
42 static char* MC_dwarf_at_type(Dwarf_Die* die);
44 const char* MC_dwarf_attrname(int attr) {
46 #include "mc_dwarf_attrnames.h"
48 return "DW_AT_unkown";
52 const char* MC_dwarf_tagname(int tag) {
54 #include "mc_dwarf_tagnames.h"
56 return "DW_TAG_invalid";
58 return "DW_TAG_unkown";
62 static inline const char* MC_dwarf_die_tagname(Dwarf_Die* die) {
63 return MC_dwarf_tagname(dwarf_tag(die));
68 static const char* MC_dwarf_attr_string(Dwarf_Die* die, int attribute) {
70 if (!dwarf_attr_integrate(die, attribute, &attr)) {
73 return dwarf_formstring(&attr);
77 /** \brief Get the linkage name (DW_AT_linkage_name or DW_AR_MIPS_linkage_name)
79 static const char* MC_dwarf_at_linkage_name(Dwarf_Die* die) {
80 const char* name = MC_dwarf_attr_string(die, DW_AT_linkage_name);
82 name = MC_dwarf_attr_string(die, DW_AT_MIPS_linkage_name);
86 static dw_location_t MC_dwarf_resolve_location_list(mc_object_info_t info, Dwarf_Word offset) {
87 char *key = bprintf("%ld", (long) offset);
88 dw_location_t loc = xbt_new0(s_dw_location_t, 1);
89 loc->type = e_dw_loclist;
90 loc->location.loclist = (xbt_dynar_t)xbt_dict_get_or_null(info->location_list, key);
91 if (!loc->location.loclist)
92 XBT_INFO("Key not found in loclist");
97 /** \brief Create a location_list from a given attribute */
98 static dw_location_t MC_dwarf_get_location_list_libdw(Dwarf_Die* die, Dwarf_Attribute* attr) {
101 dw_location_t location = xbt_new0(s_dw_location_t, 1);
102 location->type = e_dw_loclist;
103 xbt_dynar_t loclist = xbt_dynar_new(sizeof(dw_location_entry_t), NULL);
104 location->location.loclist = loclist;
106 ptrdiff_t offset = 0;
107 Dwarf_Addr base, start, end;
113 offset = dwarf_getlocations(attr, offset, &base, &start, &end, &expr, &len);
117 xbt_die("Error while loading location list");
119 dw_location_entry_t new_entry = xbt_new0(s_dw_location_entry_t, 1);
120 new_entry->lowpc = start;
121 new_entry->highpc = end;
122 new_entry->location = MC_dwarf_get_expression(expr, len);
124 xbt_dynar_push(loclist, &new_entry);
129 static dw_location_t MC_dwarf_get_location(Dwarf_Die* die, Dwarf_Attribute* attr, mc_object_info_t info) {
130 int form = dwarf_whatform(attr);
132 case DW_FORM_exprloc:
133 case DW_FORM_block1: // not in the spec
140 if (dwarf_getlocation(attr, &expr, &len))
141 xbt_die("Could not read location expression");
142 return MC_dwarf_get_expression(expr, len);
144 case DW_FORM_sec_offset:
149 if (MC_USE_LIBDW_LOCATION_LIST)
150 return MC_dwarf_get_location_list_libdw(die, attr);
153 if (!dwarf_formudata(attr, &offset))
154 return MC_dwarf_resolve_location_list(info, offset);
156 xbt_die("Location list not found");
160 xbt_die("Unexpected form %i list for location in attribute %s of <%p>%s",
162 MC_dwarf_attrname(attr->code),
163 (void*) dwarf_dieoffset(die),
164 MC_dwarf_attr_string(die, DW_AT_name));
169 static dw_location_t MC_dwarf_at_location(Dwarf_Die* die, int attribute, mc_object_info_t info) {
170 if(!dwarf_hasattr_integrate(die, attribute))
171 return xbt_new0(s_dw_location_t, 1);
173 Dwarf_Attribute attr;
174 dwarf_attr_integrate(die, attribute, &attr);
175 return MC_dwarf_get_location(die, &attr, info);
178 // Return a new string for the type (NULL if none)
179 static char* MC_dwarf_at_type(Dwarf_Die* die) {
180 Dwarf_Attribute attr;
181 if (dwarf_hasattr_integrate(die, DW_AT_type)) {
182 dwarf_attr_integrate(die, DW_AT_type, &attr);
183 Dwarf_Die subtype_die;
184 if (dwarf_formref_die(&attr, &subtype_die)==NULL) {
185 xbt_die("Could not find DIE for type");
187 Dwarf_Off subtype_global_offset = dwarf_dieoffset(&subtype_die);
188 return bprintf("%" PRIx64 , subtype_global_offset);
193 static uint64_t MC_dwarf_attr_addr(Dwarf_Die* die, int attribute) {
194 Dwarf_Attribute attr;
195 if(dwarf_attr_integrate(die, attribute, &attr)==NULL)
198 if (dwarf_formaddr(&attr, &value) == 0)
199 return (uint64_t) value;
204 static uint64_t MC_dwarf_attr_uint(Dwarf_Die* die, int attribute, uint64_t default_value) {
205 Dwarf_Attribute attr;
206 if (dwarf_attr_integrate(die, attribute, &attr)==NULL)
207 return default_value;
209 return dwarf_formudata(dwarf_attr_integrate(die, attribute, &attr), &value) == 0 ? (uint64_t) value : default_value;
212 static bool MC_dwarf_attr_flag(Dwarf_Die* die, int attribute, int integrate) {
213 Dwarf_Attribute attr;
214 if ((integrate ? dwarf_attr_integrate(die, attribute, &attr)
215 : dwarf_attr(die, attribute, &attr))==0)
219 if (dwarf_formflag(&attr, &result))
220 xbt_die("Unexpected form for attribute %s",
221 MC_dwarf_attrname(attribute));
225 static uint64_t MC_dwarf_default_lower_bound(int lang) {
230 case DW_LANG_C_plus_plus:
234 case DW_LANG_ObjC_plus_plus:
240 case DW_LANG_Fortran77:
241 case DW_LANG_Fortran90:
242 case DW_LANG_Fortran95:
243 case DW_LANG_Modula2:
244 case DW_LANG_Pascal83:
246 case DW_LANG_Cobol74:
247 case DW_LANG_Cobol85:
250 xbt_die("No default MT_TAG_lower_bound for language %i and none given", lang);
255 static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
256 // Use DW_TAG_count if present:
257 if (dwarf_hasattr_integrate(die, DW_AT_count)) {
258 return MC_dwarf_attr_uint(die, DW_AT_count, 0);
261 // Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound:
263 if (!dwarf_hasattr_integrate(die, DW_AT_upper_bound)) {
264 // This is not really 0, but the code expects this (we do not know):
267 uint64_t upper_bound = MC_dwarf_attr_uint(die, DW_AT_upper_bound, -1);
269 uint64_t lower_bound = 0;
270 if (dwarf_hasattr_integrate(die, DW_AT_lower_bound)) {
271 lower_bound = MC_dwarf_attr_uint(die, DW_AT_lower_bound, -1);
273 lower_bound = MC_dwarf_default_lower_bound(dwarf_srclang(unit));
275 return upper_bound - lower_bound;
278 static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
279 xbt_assert(dwarf_tag(die)==DW_TAG_array_type,
280 "MC_dwarf_array_element_count called with DIE of type %s", MC_dwarf_die_tagname(die));
285 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
286 int child_tag = dwarf_tag(&child);
287 if (child_tag==DW_TAG_subrange_type ||child_tag==DW_TAG_enumeration_type) {
288 result *= MC_dwarf_subrange_element_count(&child, unit);
296 Dwarf_Off MC_dwarf_resolve_location(unw_cursor_t* c, dw_location_t location, void* frame_pointer_address) {
298 switch (location->type){
300 if (xbt_dynar_length(location->location.compose) > 1){
301 return 0; /* TODO : location list with optimizations enabled */
303 dw_location_t location_entry = xbt_dynar_get_as(location->location.compose, 0, dw_location_t);
304 switch (location_entry->type){
306 unw_get_reg(c, location_entry->location.reg, &res);
308 case e_dw_bregister_op:
309 unw_get_reg(c, location_entry->location.breg_op.reg, &res);
310 return (Dwarf_Off) ((long)res + location_entry->location.breg_op.offset);
312 case e_dw_fbregister_op:
313 if (frame_pointer_address != NULL)
314 return (Dwarf_Off)((char *)frame_pointer_address + location_entry->location.fbreg_op);
318 return 0; /* FIXME : implement other cases (with optimizations enabled) */
328 static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwarf_Die* child) {
329 if (dwarf_hasattr(child, DW_AT_data_bit_offset)) {
330 xbt_die("Can't groke DW_AT_data_bit_offset.");
333 if (!dwarf_hasattr_integrate(child, DW_AT_data_member_location)) {
334 if (type->type != DW_TAG_union_type) {
336 "Missing DW_AT_data_member_location field in DW_TAG_member %s of type <%p>%s",
337 member->name, type->id, type->name);
343 Dwarf_Attribute attr;
344 dwarf_attr_integrate(child, DW_AT_data_member_location, &attr);
345 switch (dwarf_whatform(&attr)) {
347 case DW_FORM_exprloc:
351 if (dwarf_getlocation(&attr, &expr, &len)) {
353 "Could not read location expression DW_AT_data_member_location in DW_TAG_member %s of type <%p>%s",
354 MC_dwarf_attr_string(child, DW_AT_name),
355 type->id, type->name);
357 if (len==1 && expr[0].atom == DW_OP_plus_uconst) {
358 member->offset = expr[0].number;
360 xbt_die("Can't groke this location expression yet. %i %i",
361 len==1 , expr[0].atom == DW_OP_plus_uconst);
373 if (!dwarf_formudata(&attr, &offset))
374 member->offset = offset;
376 xbt_die("Cannot get DW_AT_data_member_%s location <%p>%s",
377 MC_dwarf_attr_string(child, DW_AT_name),
378 type->id, type->name);
384 static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_type_t type) {
387 xbt_assert(!type->members);
388 type->members = xbt_dynar_new(sizeof(dw_type_t), (void(*)(void*))dw_type_free);
389 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
390 if (dwarf_tag(&child)==DW_TAG_member) {
391 // TODO, we should use another type (because is is not a type but a member)
392 dw_type_t member = xbt_new0(s_dw_type_t, 1);
396 const char* name = MC_dwarf_attr_string(&child, DW_AT_name);
398 member->name = xbt_strdup(name);
402 member->byte_size = MC_dwarf_attr_uint(&child, DW_AT_byte_size, 0);
403 member->element_count = -1;
404 member->dw_type_id = MC_dwarf_at_type(&child);
405 member->members = NULL;
406 member->is_pointer_type = 0;
409 if(dwarf_hasattr(&child, DW_AT_data_bit_offset)) {
410 xbt_die("Can't groke DW_AT_data_bit_offset.");
413 MC_dwarf_fill_member_location(type, member, &child);
415 if (!member->dw_type_id) {
416 xbt_die("Missing type for member %s of <%p>%s", member->name, type->id, type->name);
419 xbt_dynar_push(type->members, &member);
424 static dw_type_t MC_dwarf_die_to_type(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit) {
426 dw_type_t type = xbt_new0(s_dw_type_t, 1);
431 type->element_count = -1;
432 type->dw_type_id = NULL;
433 type->members = NULL;
434 type->is_pointer_type = 0;
437 type->type = dwarf_tag(die);
440 type->id = (void *) dwarf_dieoffset(die);
442 const char* name = MC_dwarf_attr_string(die, DW_AT_name);
444 type->name = xbt_strdup(name);
447 XBT_DEBUG("Processing type <%p>%s", type->id, type->name);
449 type->dw_type_id = MC_dwarf_at_type(die);
451 // Computation of the byte_size;
452 if (dwarf_hasattr_integrate(die, DW_AT_byte_size))
453 type->byte_size = MC_dwarf_attr_uint(die, DW_AT_byte_size, 0);
454 else if (type->type == DW_TAG_array_type || type->type==DW_TAG_structure_type || type->type==DW_TAG_class_type) {
456 if (dwarf_aggregate_size(die, &size)==0) {
457 type->byte_size = size;
461 switch (type->type) {
462 case DW_TAG_array_type:
463 type->element_count = MC_dwarf_array_element_count(die, unit);
464 // TODO, handle DW_byte_stride and (not) DW_bit_stride
467 case DW_TAG_pointer_type:
468 case DW_TAG_reference_type:
469 case DW_TAG_rvalue_reference_type:
470 type->is_pointer_type = 1;
473 case DW_TAG_structure_type:
474 case DW_TAG_union_type:
475 case DW_TAG_class_type:
476 MC_dwarf_add_members(info, die, unit, type);
482 static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit) {
483 dw_type_t type = MC_dwarf_die_to_type(info, die, unit);
485 char* key = bprintf("%" PRIx64, (uint64_t) type->id);
486 xbt_dict_set(info->types, key, type, NULL);
489 /** \brief Convert libdw location expresion elment into native one (or NULL in some cases) */
490 static dw_location_t MC_dwarf_get_expression_element(Dwarf_Op* op) {
491 dw_location_t element = xbt_new0(s_dw_location_t, 1);
492 uint8_t atom = op->atom;
493 if (atom >= DW_OP_reg0 && atom<= DW_OP_reg31) {
494 element->type = e_dw_register;
495 element->location.reg = atom - DW_OP_reg0;
497 else if (atom >= DW_OP_breg0 && atom<= DW_OP_breg31) {
498 element->type = e_dw_bregister_op;
499 element->location.reg = atom - DW_OP_breg0;
500 element->location.breg_op.offset = op->number;
502 else if (atom >= DW_OP_lit0 && atom<= DW_OP_lit31) {
503 element->type = e_dw_lit;
504 element->location.reg = atom - DW_OP_lit0;
508 element->type = e_dw_fbregister_op;
509 element->location.fbreg_op = op->number;
512 element->type = e_dw_piece;
513 element->location.piece = op->number;
515 case DW_OP_plus_uconst:
516 element->type = e_dw_plus_uconst;
517 element->location.plus_uconst = op->number;
520 element->type = e_dw_arithmetic;
521 element->location.arithmetic = xbt_strdup("abs");
524 element->type = e_dw_arithmetic;
525 element->location.arithmetic = xbt_strdup("and");
528 element->type = e_dw_arithmetic;
529 element->location.arithmetic = xbt_strdup("div");
532 element->type = e_dw_arithmetic;
533 element->location.arithmetic = xbt_strdup("minus");
536 element->type = e_dw_arithmetic;
537 element->location.arithmetic = xbt_strdup("mod");
540 element->type = e_dw_arithmetic;
541 element->location.arithmetic = xbt_strdup("mul");
544 element->type = e_dw_arithmetic;
545 element->location.arithmetic = xbt_strdup("neg");
548 element->type = e_dw_arithmetic;
549 element->location.arithmetic = xbt_strdup("not");
552 element->type = e_dw_arithmetic;
553 element->location.arithmetic = xbt_strdup("or");
556 element->type = e_dw_arithmetic;
557 element->location.arithmetic = xbt_strdup("plus");
560 case DW_OP_stack_value:
565 case DW_OP_deref_size:
566 element->type = e_dw_deref;
567 element->location.deref_size = (unsigned int short) op->number;
570 element->type = e_dw_deref;
571 element->location.deref_size = sizeof(void *);
574 element->type = e_dw_uconstant;
575 element->location.uconstant.bytes = 1;
576 element->location.uconstant.value = (unsigned long int) op->number;
579 element->type = e_dw_sconstant;
580 element->location.uconstant.bytes = 1;
581 element->location.uconstant.value = (unsigned long int) op->number;
585 element->type = e_dw_uconstant;
586 element->location.uconstant.bytes = 1;
587 element->location.uconstant.value = (unsigned long int) op->number;
590 element->type = e_dw_uconstant;
591 element->location.uconstant.bytes = 2;
592 element->location.uconstant.value = (unsigned long int) op->number;
595 element->type = e_dw_uconstant;
596 element->location.uconstant.bytes = 4;
597 element->location.uconstant.value = (unsigned long int) op->number;
600 element->type = e_dw_uconstant;
601 element->location.uconstant.bytes = 8;
602 element->location.uconstant.value = (unsigned long int) op->number;
606 element->type = e_dw_sconstant;
607 element->location.uconstant.bytes = 1;
608 element->location.uconstant.value = (unsigned long int) op->number;
611 element->type = e_dw_sconstant;
612 element->location.uconstant.bytes = 2;
613 element->location.uconstant.value = (unsigned long int) op->number;
616 element->type = e_dw_sconstant;
617 element->location.uconstant.bytes = 4;
618 element->location.uconstant.value = (unsigned long int) op->number;
621 element->type = e_dw_sconstant;
622 element->location.uconstant.bytes = 8;
623 element->location.uconstant.value = (unsigned long int) op->number;
626 element->type = e_dw_unsupported;
632 /** \brief Convert libdw location expresion into native one */
633 static dw_location_t MC_dwarf_get_expression(Dwarf_Op* expr, size_t len) {
634 dw_location_t loc = xbt_new0(s_dw_location_t, 1);
635 loc->type = e_dw_compose;
636 loc->location.compose = xbt_dynar_new(sizeof(dw_location_t), NULL);
639 for (i=0; i!=len; ++i) {
640 dw_location_t element = MC_dwarf_get_expression_element(expr+i);
642 xbt_dynar_push(loc->location.compose, &element);
648 static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
650 if (MC_dwarf_attr_flag(die, DW_AT_declaration, false))
653 Dwarf_Attribute attr_location;
654 if (dwarf_attr(die, DW_AT_location, &attr_location)==NULL) {
655 // No location: do not add it ?
659 dw_variable_t variable = xbt_new0(s_dw_variable_t, 1);
660 variable->dwarf_offset = dwarf_dieoffset(die);
661 variable->global = frame == NULL; // Can be override base on DW_AT_location
662 variable->name = xbt_strdup(MC_dwarf_attr_string(die, DW_AT_name));
663 variable->type_origin = MC_dwarf_at_type(die);
664 variable->address.address = NULL;
667 switch (form = dwarf_whatform(&attr_location)) {
668 case DW_FORM_exprloc:
669 case DW_FORM_block1: // Not in the spec but found in the wild.
673 if (dwarf_getlocation(&attr_location, &expr, &len)) {
675 "Could not read location expression in DW_AT_location of variable <%p>%s",
676 (void*) variable->dwarf_offset, variable->name);
679 if (len==1 && expr[0].atom == DW_OP_addr) {
680 variable->global = 1;
681 Dwarf_Off offset = expr[0].number;
682 // TODO, Why is this different base on the object?
683 Dwarf_Off base = strcmp(info->file_name, xbt_binary_name) !=0 ? (Dwarf_Off) info->start_text : 0;
684 variable->address.address = (void*) (base + offset);
686 variable->address.location = MC_dwarf_get_expression(expr, len);
691 case DW_FORM_sec_offset: // type loclistptr
693 xbt_die("Do not handle loclist locations yet");
696 xbt_die("Unexpected form %i list for location in <%p>%s",
697 form, (void*) variable->dwarf_offset, variable->name);
703 static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
704 dw_variable_t variable = MC_die_to_variable(info, die, unit, frame);
707 MC_dwarf_register_variable(info, frame, variable);
710 static void MC_dwarf_handle_subprogram_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t parent_frame) {
711 dw_frame_t frame = xbt_new0(s_dw_frame_t, 1);
713 frame->start = dwarf_dieoffset(die);
715 const char* name = MC_dwarf_at_linkage_name(die);
717 name = MC_dwarf_attr_string(die, DW_AT_name);
718 frame->name = xbt_strdup(name);
720 // Variables are filled in the (recursive) call of MC_dwarf_handle_children:
721 frame->variables = xbt_dynar_new(sizeof(dw_variable_t), dw_variable_free_voidp);
722 frame->high_pc = (void*) MC_dwarf_attr_addr(die, DW_AT_high_pc);
723 frame->low_pc = (void*) MC_dwarf_attr_addr(die, DW_AT_low_pc);
724 frame->frame_base = MC_dwarf_at_location(die, DW_AT_frame_base, info);
725 frame->end = -1; // This one is now useless:
728 MC_dwarf_handle_children(info, die, unit, frame);
731 xbt_dict_set(info->local_variables, frame->name, frame, NULL);
734 static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
737 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
738 MC_dwarf_handle_die(info, &child, unit, frame);
742 static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
743 int tag = dwarf_tag(die);
745 case DW_TAG_array_type:
746 case DW_TAG_class_type:
747 case DW_TAG_enumeration_type:
749 case DW_TAG_pointer_type:
750 case DW_TAG_string_type:
751 case DW_TAG_structure_type:
752 case DW_TAG_subroutine_type:
753 case DW_TAG_union_type:
754 case DW_TAG_ptr_to_member_type:
755 case DW_TAG_set_type:
756 case DW_TAG_subrange_type:
757 case DW_TAG_base_type:
758 case DW_TAG_const_type:
759 case DW_TAG_file_type:
760 case DW_TAG_packed_type:
761 case DW_TAG_volatile_type:
762 case DW_TAG_restrict_type:
763 case DW_TAG_interface_type:
764 case DW_TAG_unspecified_type:
765 case DW_TAG_mutable_type:
766 case DW_TAG_shared_type:
767 MC_dwarf_handle_type_die(info, die, unit);
769 case DW_TAG_inlined_subroutine:
770 case DW_TAG_subprogram:
771 MC_dwarf_handle_subprogram_die(info, die, unit, frame);
773 // case DW_TAG_formal_parameter:
774 case DW_TAG_variable:
775 MC_dwarf_handle_variable_die(info, die, unit, frame);
779 // Recursive processing of children DIE:
780 MC_dwarf_handle_children(info, die, unit, frame);
783 void MC_dwarf_get_variables_libdw(mc_object_info_t info) {
784 int fd = open(info->file_name, O_RDONLY);
786 xbt_die("Could not open file %s", info->file_name);
788 Dwarf *dwarf = dwarf_begin(fd, DWARF_C_READ);
790 xbt_die("Your program must be compiled with -g");
793 Dwarf_Off offset = 0;
794 Dwarf_Off next_offset = 0;
796 while (dwarf_nextcu (dwarf, offset, &next_offset, &length, NULL, NULL, NULL) == 0) {
798 if(dwarf_offdie(dwarf, offset+length, &die)!=NULL) {
799 MC_dwarf_handle_die(info, &die, &die, NULL);
801 offset = next_offset;