1 /* Copyright (c) 2008-2013. The SimGrid Team.
2 * All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include <elfutils/libdw.h>
11 #include <simgrid_config.h>
13 #include <xbt/sysdep.h>
15 #include "mc_private.h"
17 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_dwarf, mc, "DWARF processing");
19 /** \brief The default DW_TAG_lower_bound for a given DW_AT_language.
21 * The default for a given language is defined in the DWARF spec.
23 * \param language consant as defined by the DWARf spec
25 static uint64_t MC_dwarf_default_lower_bound(int lang);
27 /** \brief Computes the the element_count of a DW_TAG_enumeration_type DIE
29 * This is the number of elements in a given array dimension.
31 * A reference of the compilation unit (DW_TAG_compile_unit) is
32 * needed because the default lower bound (when there is no DW_AT_lower_bound)
33 * depends of the language of the compilation unit (DW_AT_language).
35 * \param die DIE for the DW_TAG_enumeration_type or DW_TAG_subrange_type
36 * \param unit DIE of the DW_TAG_compile_unit
38 static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit);
40 /** \brief Computes the number of elements of a given DW_TAG_array_type.
42 * \param die DIE for the DW_TAG_array_type
44 static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit);
46 /** \brief Process a DIE
48 * \param info the resulting object fot the library/binary file (output)
49 * \param die the current DIE
50 * \param unit the DIE of the compile unit of the current DIE
51 * \param frame containg frame if any
53 static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace);
55 /** \brief Process a type DIE
57 static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace);
59 /** \brief Calls MC_dwarf_handle_die on all childrend of the given die
61 * \param info the resulting object fot the library/binary file (output)
62 * \param die the current DIE
63 * \param unit the DIE of the compile unit of the current DIE
64 * \param frame containg frame if any
66 static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace);
68 /** \brief Handle a variable (DW_TAG_variable or other)
70 * \param info the resulting object fot the library/binary file (output)
71 * \param die the current DIE
72 * \param unit the DIE of the compile unit of the current DIE
73 * \param frame containg frame if any
75 static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace);
77 /** \brief Get the DW_TAG_type of the DIE
80 * \return DW_TAG_type attribute as a new string (NULL if none)
82 static char* MC_dwarf_at_type(Dwarf_Die* die);
84 /** \brief Get the name of an attribute (DW_AT_*) from its code
86 * \param attr attribute code (see the DWARF specification)
87 * \return name of the attribute
89 const char* MC_dwarf_attrname(int attr) {
91 #include "mc_dwarf_attrnames.h"
93 return "DW_AT_unknown";
97 /** \brief Get the name of a dwarf tag (DW_TAG_*) from its code
99 * \param tag tag code (see the DWARF specification)
100 * \return name of the tag
102 const char* MC_dwarf_tagname(int tag) {
104 #include "mc_dwarf_tagnames.h"
106 return "DW_TAG_invalid";
108 return "DW_TAG_unknown";
112 /** \brief A class of DWARF tags (DW_TAG_*)
114 typedef enum mc_tag_class {
123 static mc_tag_class MC_dwarf_tag_classify(int tag) {
126 case DW_TAG_array_type:
127 case DW_TAG_class_type:
128 case DW_TAG_enumeration_type:
130 case DW_TAG_pointer_type:
131 case DW_TAG_reference_type:
132 case DW_TAG_rvalue_reference_type:
133 case DW_TAG_string_type:
134 case DW_TAG_structure_type:
135 case DW_TAG_subroutine_type:
136 case DW_TAG_union_type:
137 case DW_TAG_ptr_to_member_type:
138 case DW_TAG_set_type:
139 case DW_TAG_subrange_type:
140 case DW_TAG_base_type:
141 case DW_TAG_const_type:
142 case DW_TAG_file_type:
143 case DW_TAG_packed_type:
144 case DW_TAG_volatile_type:
145 case DW_TAG_restrict_type:
146 case DW_TAG_interface_type:
147 case DW_TAG_unspecified_type:
148 case DW_TAG_mutable_type:
149 case DW_TAG_shared_type:
152 case DW_TAG_subprogram:
153 return mc_tag_subprogram;
155 case DW_TAG_variable:
156 case DW_TAG_formal_parameter:
157 return mc_tag_variable;
159 case DW_TAG_lexical_block:
160 case DW_TAG_try_block:
161 case DW_TAG_catch_block:
162 case DW_TAG_inlined_subroutine:
163 case DW_TAG_with_stmt:
166 case DW_TAG_namespace:
167 return mc_tag_namespace;
170 return mc_tag_unknown;
175 #define MC_DW_CLASS_UNKNOWN 0
176 #define MC_DW_CLASS_ADDRESS 1 // Location in the address space of the program
177 #define MC_DW_CLASS_BLOCK 2 // Arbitrary block of bytes
178 #define MC_DW_CLASS_CONSTANT 3
179 #define MC_DW_CLASS_STRING 3 // String
180 #define MC_DW_CLASS_FLAG 4 // Boolean
181 #define MC_DW_CLASS_REFERENCE 5 // Reference to another DIE
182 #define MC_DW_CLASS_EXPRLOC 6 // DWARF expression/location description
183 #define MC_DW_CLASS_LINEPTR 7
184 #define MC_DW_CLASS_LOCLISTPTR 8
185 #define MC_DW_CLASS_MACPTR 9
186 #define MC_DW_CLASS_RANGELISTPTR 10
188 /** \brief Find the DWARF data class for a given DWARF data form
190 * This mapping is defined in the DWARF spec.
192 * \param form The form (values taken from the DWARF spec)
193 * \return An internal representation for the corresponding class
195 static int MC_dwarf_form_get_class(int form) {
198 return MC_DW_CLASS_ADDRESS;
203 return MC_DW_CLASS_BLOCK;
210 return MC_DW_CLASS_CONSTANT;
213 return MC_DW_CLASS_STRING;
214 case DW_FORM_ref_addr:
219 case DW_FORM_ref_udata:
220 return MC_DW_CLASS_REFERENCE;
222 case DW_FORM_flag_present:
223 return MC_DW_CLASS_FLAG;
224 case DW_FORM_exprloc:
225 return MC_DW_CLASS_EXPRLOC;
229 return MC_DW_CLASS_UNKNOWN;
233 /** \brief Get the name of the tag of a given DIE
236 * \return name of the tag of this DIE
238 static inline const char* MC_dwarf_die_tagname(Dwarf_Die* die) {
239 return MC_dwarf_tagname(dwarf_tag(die));
244 /** \brief Get an attribute of a given DIE as a string
247 * \param attribute attribute
248 * \return value of the given attribute of the given DIE
250 static const char* MC_dwarf_attr_integrate_string(Dwarf_Die* die, int attribute) {
251 Dwarf_Attribute attr;
252 if (!dwarf_attr_integrate(die, attribute, &attr)) {
255 return dwarf_formstring(&attr);
259 /** \brief Get the linkage name of a DIE.
261 * Use either DW_AT_linkage_name or DW_AT_MIPS_linkage_name.
262 * DW_AT_linkage_name is standardized since DWARF 4.
263 * Before this version of DWARF, the MIPS extensions
264 * DW_AT_MIPS_linkage_name is used (at least by GCC).
267 * \return linkage name of the given DIE (or NULL)
269 static const char* MC_dwarf_at_linkage_name(Dwarf_Die* die) {
270 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_linkage_name);
272 name = MC_dwarf_attr_integrate_string(die, DW_AT_MIPS_linkage_name);
276 /** \brief Find the type/subtype (DW_AT_type) for a DIE
279 * \return DW_AT_type reference as a global offset in hexadecimal (or NULL)
281 static char* MC_dwarf_at_type(Dwarf_Die* die) {
282 Dwarf_Attribute attr;
283 if (dwarf_hasattr_integrate(die, DW_AT_type)) {
284 dwarf_attr_integrate(die, DW_AT_type, &attr);
285 Dwarf_Die subtype_die;
286 if (dwarf_formref_die(&attr, &subtype_die)==NULL) {
287 xbt_die("Could not find DIE for type");
289 Dwarf_Off subtype_global_offset = dwarf_dieoffset(&subtype_die);
290 return bprintf("%" PRIx64 , subtype_global_offset);
295 static uint64_t MC_dwarf_attr_integrate_addr(Dwarf_Die* die, int attribute) {
296 Dwarf_Attribute attr;
297 if(dwarf_attr_integrate(die, attribute, &attr)==NULL)
300 if (dwarf_formaddr(&attr, &value) == 0)
301 return (uint64_t) value;
306 static uint64_t MC_dwarf_attr_integrate_uint(Dwarf_Die* die, int attribute, uint64_t default_value) {
307 Dwarf_Attribute attr;
308 if (dwarf_attr_integrate(die, attribute, &attr)==NULL)
309 return default_value;
311 return dwarf_formudata(dwarf_attr_integrate(die, attribute, &attr), &value) == 0 ? (uint64_t) value : default_value;
314 static bool MC_dwarf_attr_flag(Dwarf_Die* die, int attribute, bool integrate) {
315 Dwarf_Attribute attr;
316 if ((integrate ? dwarf_attr_integrate(die, attribute, &attr)
317 : dwarf_attr(die, attribute, &attr))==0)
321 if (dwarf_formflag(&attr, &result))
322 xbt_die("Unexpected form for attribute %s",
323 MC_dwarf_attrname(attribute));
327 /** \brief Find the default lower bound for a given language
329 * The default lower bound of an array (when DW_TAG_lower_bound
330 * is missing) depends on the language of the compilation unit.
332 * \param lang Language of the compilation unit (values defined in the DWARF spec)
333 * \return Default lower bound of an array in this compilation unit
335 static uint64_t MC_dwarf_default_lower_bound(int lang) {
340 case DW_LANG_C_plus_plus:
344 case DW_LANG_ObjC_plus_plus:
350 case DW_LANG_Fortran77:
351 case DW_LANG_Fortran90:
352 case DW_LANG_Fortran95:
353 case DW_LANG_Modula2:
354 case DW_LANG_Pascal83:
356 case DW_LANG_Cobol74:
357 case DW_LANG_Cobol85:
360 xbt_die("No default DW_TAG_lower_bound for language %i and none given", lang);
365 /** \brief Finds the number of elements in a DW_TAG_subrange_type or DW_TAG_enumeration_type DIE
368 * \param unit DIE of the compilation unit
369 * \return number of elements in the range
371 static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
372 xbt_assert(dwarf_tag(die)==DW_TAG_enumeration_type ||dwarf_tag(die)==DW_TAG_subrange_type,
373 "MC_dwarf_subrange_element_count called with DIE of type %s", MC_dwarf_die_tagname(die));
375 // Use DW_TAG_count if present:
376 if (dwarf_hasattr_integrate(die, DW_AT_count)) {
377 return MC_dwarf_attr_integrate_uint(die, DW_AT_count, 0);
380 // Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound + 1:
382 if (!dwarf_hasattr_integrate(die, DW_AT_upper_bound)) {
383 // This is not really 0, but the code expects this (we do not know):
386 uint64_t upper_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_upper_bound, -1);
388 uint64_t lower_bound = 0;
389 if (dwarf_hasattr_integrate(die, DW_AT_lower_bound)) {
390 lower_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_lower_bound, -1);
392 lower_bound = MC_dwarf_default_lower_bound(dwarf_srclang(unit));
394 return upper_bound - lower_bound + 1;
397 /** \brief Finds the number of elements in a array type (DW_TAG_array_type)
399 * The compilation unit might be needed because the default lower
400 * bound depends on the language of the compilation unit.
402 * \param die the DIE of the DW_TAG_array_type
403 * \param unit the DIE of the compilation unit
404 * \return number of elements in this array type
406 static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
407 xbt_assert(dwarf_tag(die)==DW_TAG_array_type,
408 "MC_dwarf_array_element_count called with DIE of type %s", MC_dwarf_die_tagname(die));
413 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
414 int child_tag = dwarf_tag(&child);
415 if (child_tag==DW_TAG_subrange_type ||child_tag==DW_TAG_enumeration_type) {
416 result *= MC_dwarf_subrange_element_count(&child, unit);
424 /** \brief Initialize the location of a member of a type
425 * (DW_AT_data_member_location of a DW_TAG_member).
427 * \param type a type (struct, class)
428 * \param member the member of the type
429 * \param child DIE of the member (DW_TAG_member)
431 static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwarf_Die* child) {
432 if (dwarf_hasattr(child, DW_AT_data_bit_offset)) {
433 xbt_die("Can't groke DW_AT_data_bit_offset.");
436 if (!dwarf_hasattr_integrate(child, DW_AT_data_member_location)) {
437 if (type->type != DW_TAG_union_type) {
439 "Missing DW_AT_data_member_location field in DW_TAG_member %s of type <%p>%s",
440 member->name, type->id, type->name);
446 Dwarf_Attribute attr;
447 dwarf_attr_integrate(child, DW_AT_data_member_location, &attr);
448 int form = dwarf_whatform(&attr);
449 int klass = MC_dwarf_form_get_class(form);
451 case MC_DW_CLASS_EXPRLOC:
452 case MC_DW_CLASS_BLOCK:
453 // Location expression:
457 if (dwarf_getlocation(&attr, &expr, &len)) {
459 "Could not read location expression DW_AT_data_member_location in DW_TAG_member %s of type <%p>%s",
460 MC_dwarf_attr_integrate_string(child, DW_AT_name),
461 type->id, type->name);
463 if (len==1 && expr[0].atom == DW_OP_plus_uconst) {
464 member->offset = expr[0].number;
466 mc_dwarf_expression_init(&member->location, len, expr);
470 case MC_DW_CLASS_CONSTANT:
471 // Offset from the base address of the object:
474 if (!dwarf_formudata(&attr, &offset))
475 member->offset = offset;
477 xbt_die("Cannot get %s location <%p>%s",
478 MC_dwarf_attr_integrate_string(child, DW_AT_name),
479 type->id, type->name);
482 case MC_DW_CLASS_LOCLISTPTR:
483 // Reference to a location list:
485 case MC_DW_CLASS_REFERENCE:
486 // It's supposed to be possible in DWARF2 but I couldn't find its semantic
490 "Can't handle form class (%i) / form 0x%x as DW_AT_member_location",
496 static void dw_type_free_voidp(void *t){
497 dw_type_free((dw_type_t) * (void **) t);
500 /** \brief Populate the list of members of a type
502 * \param info ELF object containing the type DIE
503 * \param die DIE of the type
504 * \param unit DIE of the compilation unit containing the type DIE
505 * \param type the type
507 static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_type_t type) {
510 xbt_assert(!type->members);
511 type->members = xbt_dynar_new(sizeof(dw_type_t), (void(*)(void*))dw_type_free_voidp);
512 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
513 int tag = dwarf_tag(&child);
514 if (tag==DW_TAG_member || tag==DW_TAG_inheritance) {
516 // Skip declarations:
517 if (MC_dwarf_attr_flag(&child, DW_AT_declaration, false))
520 // Skip compile time constants:
521 if(dwarf_hasattr(&child, DW_AT_const_value))
524 // TODO, we should use another type (because is is not a type but a member)
525 dw_type_t member = xbt_new0(s_dw_type_t, 1);
529 member->id = (void *) dwarf_dieoffset(&child);
531 const char* name = MC_dwarf_attr_integrate_string(&child, DW_AT_name);
533 member->name = xbt_strdup(name);
537 member->byte_size = MC_dwarf_attr_integrate_uint(&child, DW_AT_byte_size, 0);
538 member->element_count = -1;
539 member->dw_type_id = MC_dwarf_at_type(&child);
540 member->members = NULL;
541 member->is_pointer_type = 0;
544 if(dwarf_hasattr(&child, DW_AT_data_bit_offset)) {
545 xbt_die("Can't groke DW_AT_data_bit_offset.");
548 MC_dwarf_fill_member_location(type, member, &child);
550 if (!member->dw_type_id) {
551 xbt_die("Missing type for member %s of <%p>%s", member->name, type->id, type->name);
554 xbt_dynar_push(type->members, &member);
559 /** \brief Create a MC type object from a DIE
561 * \param info current object info object
562 * \param DIE (for a given type);
563 * \param unit compilation unit of the current DIE
564 * \return MC representation of the type
566 static dw_type_t MC_dwarf_die_to_type(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
568 dw_type_t type = xbt_new0(s_dw_type_t, 1);
573 type->element_count = -1;
574 type->dw_type_id = NULL;
575 type->members = NULL;
576 type->is_pointer_type = 0;
579 type->type = dwarf_tag(die);
582 type->id = (void *) dwarf_dieoffset(die);
584 const char* prefix = "";
585 switch (type->type) {
586 case DW_TAG_structure_type:
589 case DW_TAG_union_type:
592 case DW_TAG_class_type:
599 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
601 type->name = namespace ? bprintf("%s%s::%s", prefix, namespace, name) : bprintf("%s%s", prefix, name);
604 XBT_DEBUG("Processing type <%p>%s", type->id, type->name);
606 type->dw_type_id = MC_dwarf_at_type(die);
608 // Computation of the byte_size;
609 if (dwarf_hasattr_integrate(die, DW_AT_byte_size))
610 type->byte_size = MC_dwarf_attr_integrate_uint(die, DW_AT_byte_size, 0);
611 else if (type->type == DW_TAG_array_type || type->type==DW_TAG_structure_type || type->type==DW_TAG_class_type) {
613 if (dwarf_aggregate_size(die, &size)==0) {
614 type->byte_size = size;
618 switch (type->type) {
619 case DW_TAG_array_type:
620 type->element_count = MC_dwarf_array_element_count(die, unit);
621 // TODO, handle DW_byte_stride and (not) DW_bit_stride
624 case DW_TAG_pointer_type:
625 case DW_TAG_reference_type:
626 case DW_TAG_rvalue_reference_type:
627 type->is_pointer_type = 1;
630 case DW_TAG_structure_type:
631 case DW_TAG_union_type:
632 case DW_TAG_class_type:
633 MC_dwarf_add_members(info, die, unit, type);
634 char* new_namespace = namespace == NULL ? xbt_strdup(type->name)
635 : bprintf("%s::%s", namespace, name);
636 MC_dwarf_handle_children(info, die, unit, frame, new_namespace);
644 static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
645 dw_type_t type = MC_dwarf_die_to_type(info, die, unit, frame, namespace);
647 char* key = bprintf("%" PRIx64, (uint64_t) type->id);
648 xbt_dict_set(info->types, key, type, NULL);
651 if(type->name && type->byte_size!=0) {
652 xbt_dict_set(info->full_types_by_name, type->name, type, NULL);
656 static int mc_anonymous_variable_index = 0;
658 static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
659 // Skip declarations:
660 if (MC_dwarf_attr_flag(die, DW_AT_declaration, false))
663 // Skip compile time constants:
664 if(dwarf_hasattr(die, DW_AT_const_value))
667 Dwarf_Attribute attr_location;
668 if (dwarf_attr(die, DW_AT_location, &attr_location)==NULL) {
669 // No location: do not add it ?
673 dw_variable_t variable = xbt_new0(s_dw_variable_t, 1);
674 variable->dwarf_offset = dwarf_dieoffset(die);
675 variable->global = frame == NULL; // Can be override base on DW_AT_location
677 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
678 variable->name = xbt_strdup(name);
680 variable->type_origin = MC_dwarf_at_type(die);
682 int form = dwarf_whatform(&attr_location);
683 int klass = form == DW_FORM_sec_offset ? MC_DW_CLASS_CONSTANT : MC_dwarf_form_get_class(form);
685 case MC_DW_CLASS_EXPRLOC:
686 case MC_DW_CLASS_BLOCK:
687 // Location expression:
691 if (dwarf_getlocation(&attr_location, &expr, &len)) {
693 "Could not read location expression in DW_AT_location of variable <%p>%s",
694 (void*) variable->dwarf_offset, variable->name);
697 if (len==1 && expr[0].atom == DW_OP_addr) {
698 variable->global = 1;
699 Dwarf_Off offset = expr[0].number;
700 // TODO, Why is this different base on the object?
701 Dwarf_Off base = strcmp(info->file_name, xbt_binary_name) !=0 ? (Dwarf_Off) info->start_exec : 0;
702 variable->address = (void*) (base + offset);
704 mc_dwarf_location_list_init_from_expression(&variable->locations, len, expr);
709 case MC_DW_CLASS_LOCLISTPTR:
710 case MC_DW_CLASS_CONSTANT:
711 // Reference to location list:
712 mc_dwarf_location_list_init(&variable->locations, info, die, &attr_location);
715 xbt_die("Unexpected form 0x%x (%i), class 0x%x (%i) list for location in <%p>%s",
716 form, form, klass, klass, (void*) variable->dwarf_offset, variable->name);
719 // Handle start_scope:
720 if (dwarf_hasattr(die, DW_AT_start_scope)) {
721 Dwarf_Attribute attr;
722 dwarf_attr(die, DW_AT_start_scope, &attr);
723 int form = dwarf_whatform(&attr);
724 int klass = MC_dwarf_form_get_class(form);
726 case MC_DW_CLASS_CONSTANT:
729 variable->start_scope = dwarf_formudata(&attr, &value) == 0 ? (size_t) value : 0;
733 xbt_die("Unhandled form 0x%x, class 0x%X for DW_AT_start_scope of variable %s",
734 form, klass, name==NULL ? "?" : name);
738 if(namespace && variable->global) {
739 char* old_name = variable->name;
740 variable->name = bprintf("%s::%s", namespace, old_name);
744 // The current code needs a variable name,
745 // generate a fake one:
746 if(!variable->name) {
747 variable->name = bprintf("@anonymous#%i", mc_anonymous_variable_index++);
753 static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
754 dw_variable_t variable = MC_die_to_variable(info, die, unit, frame, namespace);
757 MC_dwarf_register_variable(info, frame, variable);
760 static void mc_frame_free_voipd(dw_frame_t* p) {
765 static void MC_dwarf_handle_scope_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t parent_frame, const char* namespace) {
766 // TODO, handle DW_TAG_type/DW_TAG_location for DW_TAG_with_stmt
767 int tag = dwarf_tag(die);
768 mc_tag_class klass = MC_dwarf_tag_classify(tag);
770 // (Template) Subprogram declaration:
771 if(klass==mc_tag_subprogram && MC_dwarf_attr_flag(die, DW_AT_declaration, false))
774 if(klass==mc_tag_scope)
775 xbt_assert(parent_frame, "No parent scope for this scope");
777 dw_frame_t frame = xbt_new0(s_dw_frame_t, 1);
780 frame->id = dwarf_dieoffset(die);
782 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
784 frame->name = namespace ? bprintf("%s::%s", namespace, name) : xbt_strdup(name);
786 // This is the base address for DWARF addresses.
787 // Relocated addresses are offset from this base address.
788 // See DWARF4 spec 7.5
789 void* base = info->flags & MC_OBJECT_INFO_EXECUTABLE ? 0 : MC_object_base_address(info);
791 // Variables are filled in the (recursive) call of MC_dwarf_handle_children:
792 frame->variables = xbt_dynar_new(sizeof(dw_variable_t), dw_variable_free_voidp);
793 frame->high_pc = ((char*) base) + MC_dwarf_attr_integrate_addr(die, DW_AT_high_pc);
794 frame->low_pc = ((char*) base) + MC_dwarf_attr_integrate_addr(die, DW_AT_low_pc);
796 if(klass==mc_tag_subprogram) {
797 Dwarf_Attribute attr_frame_base;
798 if (dwarf_attr_integrate(die, DW_AT_frame_base, &attr_frame_base))
799 mc_dwarf_location_list_init(&frame->frame_base, info, die, &attr_frame_base);
802 frame->scopes = xbt_dynar_new(sizeof(dw_frame_t), (void_f_pvoid_t) mc_frame_free_voipd);
805 if(klass==mc_tag_subprogram) {
806 char* key = bprintf("%" PRIx64, (uint64_t) frame->id);
807 xbt_dict_set(info->subprograms, key, frame, NULL);
809 } else if(klass==mc_tag_scope) {
810 xbt_dynar_push(parent_frame->scopes, &frame);
814 MC_dwarf_handle_children(info, die, unit, frame, namespace);
817 static void mc_dwarf_handle_namespace_die(
818 mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
819 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
821 xbt_die("Unexpected namespace in a subprogram");
822 char* new_namespace = namespace == NULL ? xbt_strdup(name)
823 : bprintf("%s::%s", namespace, name);
824 MC_dwarf_handle_children(info, die, unit, frame, new_namespace);
825 xbt_free(new_namespace);
828 static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
829 // For each child DIE:
832 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
833 MC_dwarf_handle_die(info, &child, unit, frame, namespace);
837 static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
838 int tag = dwarf_tag(die);
839 mc_tag_class klass = MC_dwarf_tag_classify(tag);
844 MC_dwarf_handle_type_die(info, die, unit, frame, namespace);
847 // Subprogram or scope:
848 case mc_tag_subprogram:
850 MC_dwarf_handle_scope_die(info, die, unit, frame, namespace);
854 case mc_tag_variable:
855 MC_dwarf_handle_variable_die(info, die, unit, frame, namespace);
858 case mc_tag_namespace:
859 mc_dwarf_handle_namespace_die(info, die, unit, frame, namespace);
868 /** \brief Populate the debugging informations of the given ELF object
870 * Read the DWARf information of the EFFL object and populate the
871 * lists of types, variables, functions.
873 void MC_dwarf_get_variables(mc_object_info_t info) {
874 int fd = open(info->file_name, O_RDONLY);
876 xbt_die("Could not open file %s", info->file_name);
878 Dwarf *dwarf = dwarf_begin(fd, DWARF_C_READ);
880 xbt_die("Your program must be compiled with -g");
883 // For each compilation unit:
884 Dwarf_Off offset = 0;
885 Dwarf_Off next_offset = 0;
887 while (dwarf_nextcu (dwarf, offset, &next_offset, &length, NULL, NULL, NULL) == 0) {
889 if(dwarf_offdie(dwarf, offset+length, &unit_die)!=NULL) {
891 // For each child DIE:
894 for (res=dwarf_child(&unit_die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
895 MC_dwarf_handle_die(info, &child, &unit_die, NULL, NULL);
899 offset = next_offset;