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 * \param language consant as defined by the DWARf spec
26 static uint64_t MC_dwarf_default_lower_bound(int lang);
28 /** \brief Computes the the element_count of a DW_TAG_enumeration_type DIE
30 * This is the number of elements in a given array dimension.
32 * A reference of the compilation unit (DW_TAG_compile_unit) is
33 * needed because the default lower bound (when there is no DW_AT_lower_bound)
34 * depends of the language of the compilation unit (DW_AT_language).
36 * \param die DIE for the DW_TAG_enumeration_type or DW_TAG_subrange_type
37 * \param unit DIE of the DW_TAG_compile_unit
39 static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit);
41 /** \brief Computes the number of elements of a given DW_TAG_array_type.
43 * \param die DIE for the DW_TAG_array_type
45 static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit);
47 /** \brief Process a DIE
49 * \param info the resulting object fot the library/binary file (output)
50 * \param die the current DIE
51 * \param unit the DIE of the compile unit of the current DIE
52 * \param frame containg frame if any
54 static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame);
56 /** \brief Process a type DIE
58 static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit);
60 /** \brief Calls MC_dwarf_handle_die on all childrend of the given die
62 * \param info the resulting object fot the library/binary file (output)
63 * \param die the current DIE
64 * \param unit the DIE of the compile unit of the current DIE
65 * \param frame containg frame if any
67 static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame);
69 /** \brief Handle a variable (DW_TAG_variable or other)
71 * \param info the resulting object fot the library/binary file (output)
72 * \param die the current DIE
73 * \param unit the DIE of the compile unit of the current DIE
74 * \param frame containg frame if any
76 static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame);
78 /** \brief Convert a libdw DWARF expression into a MC representation of the location
80 * \param expr array of DWARf operations
81 * \param len number of elements
82 * \return a new MC expression
84 static dw_location_t MC_dwarf_get_expression(Dwarf_Op* expr, size_t len);
86 /** \brief Get the DW_TAG_type of the DIE
89 * \return DW_TAG_type attribute as a new string (NULL if none)
91 static char* MC_dwarf_at_type(Dwarf_Die* die);
93 /** \brief Get the name of an attribute (DW_AT_*) from its code
95 * \param attr attribute code (see the DWARF specification)
96 * \return name of the attribute
98 const char* MC_dwarf_attrname(int attr) {
100 #include "mc_dwarf_attrnames.h"
102 return "DW_AT_unkown";
106 /** \brief Get the name of a dwarf tag (DW_TAG_*) from its code
108 * \param tag tag code (see the DWARF specification)
109 * \return name of the tag
111 const char* MC_dwarf_tagname(int tag) {
113 #include "mc_dwarf_tagnames.h"
115 return "DW_TAG_invalid";
117 return "DW_TAG_unkown";
121 /** \brief Get the name of the tag of a given DIE
124 * \return name of the tag of this DIE
126 static inline const char* MC_dwarf_die_tagname(Dwarf_Die* die) {
127 return MC_dwarf_tagname(dwarf_tag(die));
132 /** \brief Get an attribute of a given DIE as a string
135 * \param attribute attribute
136 * \return value of the given attribute of the given DIE
138 static const char* MC_dwarf_attr_string(Dwarf_Die* die, int attribute) {
139 Dwarf_Attribute attr;
140 if (!dwarf_attr_integrate(die, attribute, &attr)) {
143 return dwarf_formstring(&attr);
147 /** \brief Get the linkage name of a DIE.
149 * Use either DW_AT_linkage_name or DW_AR_MIPS_linkage_name.
152 * \return linkage name of the given DIE (or NULL)
154 static const char* MC_dwarf_at_linkage_name(Dwarf_Die* die) {
155 const char* name = MC_dwarf_attr_string(die, DW_AT_linkage_name);
157 name = MC_dwarf_attr_string(die, DW_AT_MIPS_linkage_name);
161 /** \brief Create a location list from a given attribute
164 * \param attr the attribute
165 * \return MC specific representation of the location list represented by the given attribute
168 static dw_location_t MC_dwarf_get_location_list(Dwarf_Die* die, Dwarf_Attribute* attr) {
170 dw_location_t location = xbt_new0(s_dw_location_t, 1);
171 location->type = e_dw_loclist;
172 xbt_dynar_t loclist = xbt_dynar_new(sizeof(dw_location_entry_t), NULL);
173 location->location.loclist = loclist;
175 ptrdiff_t offset = 0;
176 Dwarf_Addr base, start, end;
182 offset = dwarf_getlocations(attr, offset, &base, &start, &end, &expr, &len);
186 xbt_die("Error while loading location list");
188 dw_location_entry_t new_entry = xbt_new0(s_dw_location_entry_t, 1);
189 new_entry->lowpc = start;
190 new_entry->highpc = end;
191 new_entry->location = MC_dwarf_get_expression(expr, len);
193 xbt_dynar_push(loclist, &new_entry);
198 /** \brief Get the location expression or location list from an attribute
200 * Processes direct expressions as well as location lists.
203 * \param attr the attribute
204 * \return MC specific representation of the location represented by the given attribute
207 static dw_location_t MC_dwarf_get_location(Dwarf_Die* die, Dwarf_Attribute* attr) {
208 int form = dwarf_whatform(attr);
211 // The attribute is an DWARF location expression:
212 case DW_FORM_exprloc:
213 case DW_FORM_block1: // not in the spec
220 if (dwarf_getlocation(attr, &expr, &len))
221 xbt_die("Could not read location expression");
222 return MC_dwarf_get_expression(expr, len);
225 // The attribute is a reference to a location list entry:
226 case DW_FORM_sec_offset:
231 return MC_dwarf_get_location_list(die, attr);
236 xbt_die("Unexpected form %i list for location in attribute %s of <%p>%s",
238 MC_dwarf_attrname(attr->code),
239 (void*) dwarf_dieoffset(die),
240 MC_dwarf_attr_string(die, DW_AT_name));
245 /** \brief Get the location expression or location list from an attribute
247 * Processes direct expressions as well as location lists.
250 * \param attribute the attribute code
251 * \return MC specific representation of the location represented by the given attribute
254 static dw_location_t MC_dwarf_at_location(Dwarf_Die* die, int attribute) {
255 if(!dwarf_hasattr_integrate(die, attribute))
256 return xbt_new0(s_dw_location_t, 1);
258 Dwarf_Attribute attr;
259 dwarf_attr_integrate(die, attribute, &attr);
260 return MC_dwarf_get_location(die, &attr);
263 static char* MC_dwarf_at_type(Dwarf_Die* die) {
264 Dwarf_Attribute attr;
265 if (dwarf_hasattr_integrate(die, DW_AT_type)) {
266 dwarf_attr_integrate(die, DW_AT_type, &attr);
267 Dwarf_Die subtype_die;
268 if (dwarf_formref_die(&attr, &subtype_die)==NULL) {
269 xbt_die("Could not find DIE for type");
271 Dwarf_Off subtype_global_offset = dwarf_dieoffset(&subtype_die);
272 return bprintf("%" PRIx64 , subtype_global_offset);
277 static uint64_t MC_dwarf_attr_addr(Dwarf_Die* die, int attribute) {
278 Dwarf_Attribute attr;
279 if(dwarf_attr_integrate(die, attribute, &attr)==NULL)
282 if (dwarf_formaddr(&attr, &value) == 0)
283 return (uint64_t) value;
288 static uint64_t MC_dwarf_attr_uint(Dwarf_Die* die, int attribute, uint64_t default_value) {
289 Dwarf_Attribute attr;
290 if (dwarf_attr_integrate(die, attribute, &attr)==NULL)
291 return default_value;
293 return dwarf_formudata(dwarf_attr_integrate(die, attribute, &attr), &value) == 0 ? (uint64_t) value : default_value;
296 static bool MC_dwarf_attr_flag(Dwarf_Die* die, int attribute, int integrate) {
297 Dwarf_Attribute attr;
298 if ((integrate ? dwarf_attr_integrate(die, attribute, &attr)
299 : dwarf_attr(die, attribute, &attr))==0)
303 if (dwarf_formflag(&attr, &result))
304 xbt_die("Unexpected form for attribute %s",
305 MC_dwarf_attrname(attribute));
309 static uint64_t MC_dwarf_default_lower_bound(int lang) {
314 case DW_LANG_C_plus_plus:
318 case DW_LANG_ObjC_plus_plus:
324 case DW_LANG_Fortran77:
325 case DW_LANG_Fortran90:
326 case DW_LANG_Fortran95:
327 case DW_LANG_Modula2:
328 case DW_LANG_Pascal83:
330 case DW_LANG_Cobol74:
331 case DW_LANG_Cobol85:
334 xbt_die("No default MT_TAG_lower_bound for language %i and none given", lang);
339 static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
340 xbt_assert(dwarf_tag(die)==DW_TAG_enumeration_type ||dwarf_tag(die)==DW_TAG_subrange_type,
341 "MC_dwarf_subrange_element_count called with DIE of type %s", MC_dwarf_die_tagname(die));
343 // Use DW_TAG_count if present:
344 if (dwarf_hasattr_integrate(die, DW_AT_count)) {
345 return MC_dwarf_attr_uint(die, DW_AT_count, 0);
348 // Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound:
350 if (!dwarf_hasattr_integrate(die, DW_AT_upper_bound)) {
351 // This is not really 0, but the code expects this (we do not know):
354 uint64_t upper_bound = MC_dwarf_attr_uint(die, DW_AT_upper_bound, -1);
356 uint64_t lower_bound = 0;
357 if (dwarf_hasattr_integrate(die, DW_AT_lower_bound)) {
358 lower_bound = MC_dwarf_attr_uint(die, DW_AT_lower_bound, -1);
360 lower_bound = MC_dwarf_default_lower_bound(dwarf_srclang(unit));
362 return upper_bound - lower_bound;
365 static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
366 xbt_assert(dwarf_tag(die)==DW_TAG_array_type,
367 "MC_dwarf_array_element_count called with DIE of type %s", MC_dwarf_die_tagname(die));
372 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
373 int child_tag = dwarf_tag(&child);
374 if (child_tag==DW_TAG_subrange_type ||child_tag==DW_TAG_enumeration_type) {
375 result *= MC_dwarf_subrange_element_count(&child, unit);
383 Dwarf_Off MC_dwarf_resolve_location(unw_cursor_t* c, dw_location_t location, void* frame_pointer_address) {
385 switch (location->type){
387 if (xbt_dynar_length(location->location.compose) > 1){
388 return 0; /* TODO : location list with optimizations enabled */
390 dw_location_t location_entry = xbt_dynar_get_as(location->location.compose, 0, dw_location_t);
391 switch (location_entry->type){
393 unw_get_reg(c, location_entry->location.reg, &res);
395 case e_dw_bregister_op:
396 unw_get_reg(c, location_entry->location.breg_op.reg, &res);
397 return (Dwarf_Off) ((long)res + location_entry->location.breg_op.offset);
399 case e_dw_fbregister_op:
400 if (frame_pointer_address != NULL)
401 return (Dwarf_Off)((char *)frame_pointer_address + location_entry->location.fbreg_op);
405 return 0; /* FIXME : implement other cases (with optimizations enabled) */
415 static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwarf_Die* child) {
416 if (dwarf_hasattr(child, DW_AT_data_bit_offset)) {
417 xbt_die("Can't groke DW_AT_data_bit_offset.");
420 if (!dwarf_hasattr_integrate(child, DW_AT_data_member_location)) {
421 if (type->type != DW_TAG_union_type) {
423 "Missing DW_AT_data_member_location field in DW_TAG_member %s of type <%p>%s",
424 member->name, type->id, type->name);
430 Dwarf_Attribute attr;
431 dwarf_attr_integrate(child, DW_AT_data_member_location, &attr);
432 switch (dwarf_whatform(&attr)) {
434 case DW_FORM_exprloc:
438 if (dwarf_getlocation(&attr, &expr, &len)) {
440 "Could not read location expression DW_AT_data_member_location in DW_TAG_member %s of type <%p>%s",
441 MC_dwarf_attr_string(child, DW_AT_name),
442 type->id, type->name);
444 if (len==1 && expr[0].atom == DW_OP_plus_uconst) {
445 member->offset = expr[0].number;
447 xbt_die("Can't groke this location expression yet. %i %i",
448 len==1 , expr[0].atom == DW_OP_plus_uconst);
460 if (!dwarf_formudata(&attr, &offset))
461 member->offset = offset;
463 xbt_die("Cannot get DW_AT_data_member_%s location <%p>%s",
464 MC_dwarf_attr_string(child, DW_AT_name),
465 type->id, type->name);
471 static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_type_t type) {
474 xbt_assert(!type->members);
475 type->members = xbt_dynar_new(sizeof(dw_type_t), (void(*)(void*))dw_type_free);
476 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
477 if (dwarf_tag(&child)==DW_TAG_member) {
478 // TODO, we should use another type (because is is not a type but a member)
479 dw_type_t member = xbt_new0(s_dw_type_t, 1);
483 const char* name = MC_dwarf_attr_string(&child, DW_AT_name);
485 member->name = xbt_strdup(name);
489 member->byte_size = MC_dwarf_attr_uint(&child, DW_AT_byte_size, 0);
490 member->element_count = -1;
491 member->dw_type_id = MC_dwarf_at_type(&child);
492 member->members = NULL;
493 member->is_pointer_type = 0;
496 if(dwarf_hasattr(&child, DW_AT_data_bit_offset)) {
497 xbt_die("Can't groke DW_AT_data_bit_offset.");
500 MC_dwarf_fill_member_location(type, member, &child);
502 if (!member->dw_type_id) {
503 xbt_die("Missing type for member %s of <%p>%s", member->name, type->id, type->name);
506 xbt_dynar_push(type->members, &member);
511 /** \brief Create a MC type object from a DIE
513 * \param info current object info object
514 * \param DIE (for a given type);
515 * \param unit compilation unit of the current DIE
516 * \return MC representation of the type
518 static dw_type_t MC_dwarf_die_to_type(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit) {
520 dw_type_t type = xbt_new0(s_dw_type_t, 1);
525 type->element_count = -1;
526 type->dw_type_id = NULL;
527 type->members = NULL;
528 type->is_pointer_type = 0;
531 type->type = dwarf_tag(die);
534 type->id = (void *) dwarf_dieoffset(die);
536 const char* name = MC_dwarf_attr_string(die, DW_AT_name);
538 type->name = xbt_strdup(name);
541 XBT_DEBUG("Processing type <%p>%s", type->id, type->name);
543 type->dw_type_id = MC_dwarf_at_type(die);
545 // Computation of the byte_size;
546 if (dwarf_hasattr_integrate(die, DW_AT_byte_size))
547 type->byte_size = MC_dwarf_attr_uint(die, DW_AT_byte_size, 0);
548 else if (type->type == DW_TAG_array_type || type->type==DW_TAG_structure_type || type->type==DW_TAG_class_type) {
550 if (dwarf_aggregate_size(die, &size)==0) {
551 type->byte_size = size;
555 switch (type->type) {
556 case DW_TAG_array_type:
557 type->element_count = MC_dwarf_array_element_count(die, unit);
558 // TODO, handle DW_byte_stride and (not) DW_bit_stride
561 case DW_TAG_pointer_type:
562 case DW_TAG_reference_type:
563 case DW_TAG_rvalue_reference_type:
564 type->is_pointer_type = 1;
567 case DW_TAG_structure_type:
568 case DW_TAG_union_type:
569 case DW_TAG_class_type:
570 MC_dwarf_add_members(info, die, unit, type);
576 static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit) {
577 dw_type_t type = MC_dwarf_die_to_type(info, die, unit);
579 char* key = bprintf("%" PRIx64, (uint64_t) type->id);
580 xbt_dict_set(info->types, key, type, NULL);
583 /** \brief Convert libdw location expresion elment into native one (or NULL in some cases) */
584 static dw_location_t MC_dwarf_get_expression_element(Dwarf_Op* op) {
585 dw_location_t element = xbt_new0(s_dw_location_t, 1);
586 uint8_t atom = op->atom;
587 if (atom >= DW_OP_reg0 && atom<= DW_OP_reg31) {
588 element->type = e_dw_register;
589 element->location.reg = atom - DW_OP_reg0;
591 else if (atom >= DW_OP_breg0 && atom<= DW_OP_breg31) {
592 element->type = e_dw_bregister_op;
593 element->location.reg = atom - DW_OP_breg0;
594 element->location.breg_op.offset = op->number;
596 else if (atom >= DW_OP_lit0 && atom<= DW_OP_lit31) {
597 element->type = e_dw_lit;
598 element->location.reg = atom - DW_OP_lit0;
602 element->type = e_dw_fbregister_op;
603 element->location.fbreg_op = op->number;
606 element->type = e_dw_piece;
607 element->location.piece = op->number;
609 case DW_OP_plus_uconst:
610 element->type = e_dw_plus_uconst;
611 element->location.plus_uconst = op->number;
614 element->type = e_dw_arithmetic;
615 element->location.arithmetic = xbt_strdup("abs");
618 element->type = e_dw_arithmetic;
619 element->location.arithmetic = xbt_strdup("and");
622 element->type = e_dw_arithmetic;
623 element->location.arithmetic = xbt_strdup("div");
626 element->type = e_dw_arithmetic;
627 element->location.arithmetic = xbt_strdup("minus");
630 element->type = e_dw_arithmetic;
631 element->location.arithmetic = xbt_strdup("mod");
634 element->type = e_dw_arithmetic;
635 element->location.arithmetic = xbt_strdup("mul");
638 element->type = e_dw_arithmetic;
639 element->location.arithmetic = xbt_strdup("neg");
642 element->type = e_dw_arithmetic;
643 element->location.arithmetic = xbt_strdup("not");
646 element->type = e_dw_arithmetic;
647 element->location.arithmetic = xbt_strdup("or");
650 element->type = e_dw_arithmetic;
651 element->location.arithmetic = xbt_strdup("plus");
654 case DW_OP_stack_value:
659 case DW_OP_deref_size:
660 element->type = e_dw_deref;
661 element->location.deref_size = (unsigned int short) op->number;
664 element->type = e_dw_deref;
665 element->location.deref_size = sizeof(void *);
668 element->type = e_dw_uconstant;
669 element->location.uconstant.bytes = 1;
670 element->location.uconstant.value = (unsigned long int) op->number;
673 element->type = e_dw_sconstant;
674 element->location.uconstant.bytes = 1;
675 element->location.uconstant.value = (unsigned long int) op->number;
679 element->type = e_dw_uconstant;
680 element->location.uconstant.bytes = 1;
681 element->location.uconstant.value = (unsigned long int) op->number;
684 element->type = e_dw_uconstant;
685 element->location.uconstant.bytes = 2;
686 element->location.uconstant.value = (unsigned long int) op->number;
689 element->type = e_dw_uconstant;
690 element->location.uconstant.bytes = 4;
691 element->location.uconstant.value = (unsigned long int) op->number;
694 element->type = e_dw_uconstant;
695 element->location.uconstant.bytes = 8;
696 element->location.uconstant.value = (unsigned long int) op->number;
700 element->type = e_dw_sconstant;
701 element->location.uconstant.bytes = 1;
702 element->location.uconstant.value = (unsigned long int) op->number;
705 element->type = e_dw_sconstant;
706 element->location.uconstant.bytes = 2;
707 element->location.uconstant.value = (unsigned long int) op->number;
710 element->type = e_dw_sconstant;
711 element->location.uconstant.bytes = 4;
712 element->location.uconstant.value = (unsigned long int) op->number;
715 element->type = e_dw_sconstant;
716 element->location.uconstant.bytes = 8;
717 element->location.uconstant.value = (unsigned long int) op->number;
720 element->type = e_dw_unsupported;
726 /** \brief Convert libdw location expresion into native one */
727 static dw_location_t MC_dwarf_get_expression(Dwarf_Op* expr, size_t len) {
728 dw_location_t loc = xbt_new0(s_dw_location_t, 1);
729 loc->type = e_dw_compose;
730 loc->location.compose = xbt_dynar_new(sizeof(dw_location_t), NULL);
733 for (i=0; i!=len; ++i) {
734 dw_location_t element = MC_dwarf_get_expression_element(expr+i);
736 xbt_dynar_push(loc->location.compose, &element);
742 static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
744 if (MC_dwarf_attr_flag(die, DW_AT_declaration, false))
747 Dwarf_Attribute attr_location;
748 if (dwarf_attr(die, DW_AT_location, &attr_location)==NULL) {
749 // No location: do not add it ?
753 dw_variable_t variable = xbt_new0(s_dw_variable_t, 1);
754 variable->dwarf_offset = dwarf_dieoffset(die);
755 variable->global = frame == NULL; // Can be override base on DW_AT_location
756 variable->name = xbt_strdup(MC_dwarf_attr_string(die, DW_AT_name));
757 variable->type_origin = MC_dwarf_at_type(die);
758 variable->address.address = NULL;
761 switch (form = dwarf_whatform(&attr_location)) {
762 case DW_FORM_exprloc:
763 case DW_FORM_block1: // Not in the spec but found in the wild.
767 if (dwarf_getlocation(&attr_location, &expr, &len)) {
769 "Could not read location expression in DW_AT_location of variable <%p>%s",
770 (void*) variable->dwarf_offset, variable->name);
773 if (len==1 && expr[0].atom == DW_OP_addr) {
774 variable->global = 1;
775 Dwarf_Off offset = expr[0].number;
776 // TODO, Why is this different base on the object?
777 Dwarf_Off base = strcmp(info->file_name, xbt_binary_name) !=0 ? (Dwarf_Off) info->start_text : 0;
778 variable->address.address = (void*) (base + offset);
780 variable->address.location = MC_dwarf_get_expression(expr, len);
785 case DW_FORM_sec_offset: // type loclistptr
789 variable->address.location = MC_dwarf_get_location_list(die, &attr_location);
792 xbt_die("Unexpected form %i list for location in <%p>%s",
793 form, (void*) variable->dwarf_offset, variable->name);
799 static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
800 dw_variable_t variable = MC_die_to_variable(info, die, unit, frame);
803 MC_dwarf_register_variable(info, frame, variable);
806 static void MC_dwarf_handle_subprogram_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t parent_frame) {
807 dw_frame_t frame = xbt_new0(s_dw_frame_t, 1);
809 frame->start = dwarf_dieoffset(die);
811 const char* name = MC_dwarf_at_linkage_name(die);
813 name = MC_dwarf_attr_string(die, DW_AT_name);
814 frame->name = xbt_strdup(name);
816 // Variables are filled in the (recursive) call of MC_dwarf_handle_children:
817 frame->variables = xbt_dynar_new(sizeof(dw_variable_t), dw_variable_free_voidp);
818 frame->high_pc = (void*) MC_dwarf_attr_addr(die, DW_AT_high_pc);
819 frame->low_pc = (void*) MC_dwarf_attr_addr(die, DW_AT_low_pc);
820 frame->frame_base = MC_dwarf_at_location(die, DW_AT_frame_base);
821 frame->end = -1; // This one is now useless:
824 MC_dwarf_handle_children(info, die, unit, frame);
827 xbt_dict_set(info->local_variables, frame->name, frame, NULL);
830 static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
833 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
834 MC_dwarf_handle_die(info, &child, unit, frame);
838 static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) {
839 int tag = dwarf_tag(die);
841 case DW_TAG_array_type:
842 case DW_TAG_class_type:
843 case DW_TAG_enumeration_type:
845 case DW_TAG_pointer_type:
846 case DW_TAG_string_type:
847 case DW_TAG_structure_type:
848 case DW_TAG_subroutine_type:
849 case DW_TAG_union_type:
850 case DW_TAG_ptr_to_member_type:
851 case DW_TAG_set_type:
852 case DW_TAG_subrange_type:
853 case DW_TAG_base_type:
854 case DW_TAG_const_type:
855 case DW_TAG_file_type:
856 case DW_TAG_packed_type:
857 case DW_TAG_volatile_type:
858 case DW_TAG_restrict_type:
859 case DW_TAG_interface_type:
860 case DW_TAG_unspecified_type:
861 case DW_TAG_mutable_type:
862 case DW_TAG_shared_type:
863 MC_dwarf_handle_type_die(info, die, unit);
865 case DW_TAG_inlined_subroutine:
866 case DW_TAG_subprogram:
867 MC_dwarf_handle_subprogram_die(info, die, unit, frame);
869 // case DW_TAG_formal_parameter:
870 case DW_TAG_variable:
871 case DW_TAG_formal_parameter:
872 MC_dwarf_handle_variable_die(info, die, unit, frame);
876 // Recursive processing of children DIE:
877 MC_dwarf_handle_children(info, die, unit, frame);
880 void MC_dwarf_get_variables(mc_object_info_t info) {
881 int fd = open(info->file_name, O_RDONLY);
883 xbt_die("Could not open file %s", info->file_name);
885 Dwarf *dwarf = dwarf_begin(fd, DWARF_C_READ);
887 xbt_die("Your program must be compiled with -g");
890 Dwarf_Off offset = 0;
891 Dwarf_Off next_offset = 0;
893 while (dwarf_nextcu (dwarf, offset, &next_offset, &length, NULL, NULL, NULL) == 0) {
895 if(dwarf_offdie(dwarf, offset+length, &die)!=NULL) {
896 MC_dwarf_handle_die(info, &die, &die, NULL);
898 offset = next_offset;