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_inlined_subroutine:
164 case DW_TAG_namespace:
165 return mc_tag_namespace;
168 return mc_tag_unknown;
173 #define MC_DW_CLASS_UNKNOWN 0
174 #define MC_DW_CLASS_ADDRESS 1 // Location in the address space of the program
175 #define MC_DW_CLASS_BLOCK 2 // Arbitrary block of bytes
176 #define MC_DW_CLASS_CONSTANT 3
177 #define MC_DW_CLASS_STRING 3 // String
178 #define MC_DW_CLASS_FLAG 4 // Boolean
179 #define MC_DW_CLASS_REFERENCE 5 // Reference to another DIE
180 #define MC_DW_CLASS_EXPRLOC 6 // DWARF expression/location description
181 #define MC_DW_CLASS_LINEPTR 7
182 #define MC_DW_CLASS_LOCLISTPTR 8
183 #define MC_DW_CLASS_MACPTR 9
184 #define MC_DW_CLASS_RANGELISTPTR 10
186 /** \brief Find the DWARF data class for a given DWARF data form
188 * This mapping is defined in the DWARF spec.
190 * \param form The form (values taken from the DWARF spec)
191 * \return An internal representation for the corresponding class
193 static int MC_dwarf_form_get_class(int form) {
196 return MC_DW_CLASS_ADDRESS;
201 return MC_DW_CLASS_BLOCK;
208 return MC_DW_CLASS_CONSTANT;
211 return MC_DW_CLASS_STRING;
212 case DW_FORM_ref_addr:
217 case DW_FORM_ref_udata:
218 return MC_DW_CLASS_REFERENCE;
220 case DW_FORM_flag_present:
221 return MC_DW_CLASS_FLAG;
222 case DW_FORM_exprloc:
223 return MC_DW_CLASS_EXPRLOC;
227 return MC_DW_CLASS_UNKNOWN;
231 /** \brief Get the name of the tag of a given DIE
234 * \return name of the tag of this DIE
236 static inline const char* MC_dwarf_die_tagname(Dwarf_Die* die) {
237 return MC_dwarf_tagname(dwarf_tag(die));
242 /** \brief Get an attribute of a given DIE as a string
245 * \param attribute attribute
246 * \return value of the given attribute of the given DIE
248 static const char* MC_dwarf_attr_integrate_string(Dwarf_Die* die, int attribute) {
249 Dwarf_Attribute attr;
250 if (!dwarf_attr_integrate(die, attribute, &attr)) {
253 return dwarf_formstring(&attr);
257 /** \brief Get the linkage name of a DIE.
259 * Use either DW_AT_linkage_name or DW_AT_MIPS_linkage_name.
260 * DW_AT_linkage_name is standardized since DWARF 4.
261 * Before this version of DWARF, the MIPS extensions
262 * DW_AT_MIPS_linkage_name is used (at least by GCC).
265 * \return linkage name of the given DIE (or NULL)
267 static const char* MC_dwarf_at_linkage_name(Dwarf_Die* die) {
268 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_linkage_name);
270 name = MC_dwarf_attr_integrate_string(die, DW_AT_MIPS_linkage_name);
274 /** \brief Find the type/subtype (DW_AT_type) for a DIE
277 * \return DW_AT_type reference as a global offset in hexadecimal (or NULL)
279 static char* MC_dwarf_at_type(Dwarf_Die* die) {
280 Dwarf_Attribute attr;
281 if (dwarf_hasattr_integrate(die, DW_AT_type)) {
282 dwarf_attr_integrate(die, DW_AT_type, &attr);
283 Dwarf_Die subtype_die;
284 if (dwarf_formref_die(&attr, &subtype_die)==NULL) {
285 xbt_die("Could not find DIE for type");
287 Dwarf_Off subtype_global_offset = dwarf_dieoffset(&subtype_die);
288 return bprintf("%" PRIx64 , subtype_global_offset);
293 static uint64_t MC_dwarf_attr_integrate_addr(Dwarf_Die* die, int attribute) {
294 Dwarf_Attribute attr;
295 if(dwarf_attr_integrate(die, attribute, &attr)==NULL)
298 if (dwarf_formaddr(&attr, &value) == 0)
299 return (uint64_t) value;
304 static uint64_t MC_dwarf_attr_integrate_uint(Dwarf_Die* die, int attribute, uint64_t default_value) {
305 Dwarf_Attribute attr;
306 if (dwarf_attr_integrate(die, attribute, &attr)==NULL)
307 return default_value;
309 return dwarf_formudata(dwarf_attr_integrate(die, attribute, &attr), &value) == 0 ? (uint64_t) value : default_value;
312 static bool MC_dwarf_attr_flag(Dwarf_Die* die, int attribute, bool integrate) {
313 Dwarf_Attribute attr;
314 if ((integrate ? dwarf_attr_integrate(die, attribute, &attr)
315 : dwarf_attr(die, attribute, &attr))==0)
319 if (dwarf_formflag(&attr, &result))
320 xbt_die("Unexpected form for attribute %s",
321 MC_dwarf_attrname(attribute));
325 /** \brief Find the default lower bound for a given language
327 * The default lower bound of an array (when DW_TAG_lower_bound
328 * is missing) depends on the language of the compilation unit.
330 * \param lang Language of the compilation unit (values defined in the DWARF spec)
331 * \return Default lower bound of an array in this compilation unit
333 static uint64_t MC_dwarf_default_lower_bound(int lang) {
338 case DW_LANG_C_plus_plus:
342 case DW_LANG_ObjC_plus_plus:
348 case DW_LANG_Fortran77:
349 case DW_LANG_Fortran90:
350 case DW_LANG_Fortran95:
351 case DW_LANG_Modula2:
352 case DW_LANG_Pascal83:
354 case DW_LANG_Cobol74:
355 case DW_LANG_Cobol85:
358 xbt_die("No default DW_TAG_lower_bound for language %i and none given", lang);
363 /** \brief Finds the number of elements in a DW_TAG_subrange_type or DW_TAG_enumeration_type DIE
366 * \param unit DIE of the compilation unit
367 * \return number of elements in the range
369 static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
370 xbt_assert(dwarf_tag(die)==DW_TAG_enumeration_type ||dwarf_tag(die)==DW_TAG_subrange_type,
371 "MC_dwarf_subrange_element_count called with DIE of type %s", MC_dwarf_die_tagname(die));
373 // Use DW_TAG_count if present:
374 if (dwarf_hasattr_integrate(die, DW_AT_count)) {
375 return MC_dwarf_attr_integrate_uint(die, DW_AT_count, 0);
378 // Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound + 1:
380 if (!dwarf_hasattr_integrate(die, DW_AT_upper_bound)) {
381 // This is not really 0, but the code expects this (we do not know):
384 uint64_t upper_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_upper_bound, -1);
386 uint64_t lower_bound = 0;
387 if (dwarf_hasattr_integrate(die, DW_AT_lower_bound)) {
388 lower_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_lower_bound, -1);
390 lower_bound = MC_dwarf_default_lower_bound(dwarf_srclang(unit));
392 return upper_bound - lower_bound + 1;
395 /** \brief Finds the number of elements in a array type (DW_TAG_array_type)
397 * The compilation unit might be needed because the default lower
398 * bound depends on the language of the compilation unit.
400 * \param die the DIE of the DW_TAG_array_type
401 * \param unit the DIE of the compilation unit
402 * \return number of elements in this array type
404 static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
405 xbt_assert(dwarf_tag(die)==DW_TAG_array_type,
406 "MC_dwarf_array_element_count called with DIE of type %s", MC_dwarf_die_tagname(die));
411 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
412 int child_tag = dwarf_tag(&child);
413 if (child_tag==DW_TAG_subrange_type ||child_tag==DW_TAG_enumeration_type) {
414 result *= MC_dwarf_subrange_element_count(&child, unit);
422 /** \brief Initialize the location of a member of a type
423 * (DW_AT_data_member_location of a DW_TAG_member).
425 * \param type a type (struct, class)
426 * \param member the member of the type
427 * \param child DIE of the member (DW_TAG_member)
429 static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwarf_Die* child) {
430 if (dwarf_hasattr(child, DW_AT_data_bit_offset)) {
431 xbt_die("Can't groke DW_AT_data_bit_offset.");
434 if (!dwarf_hasattr_integrate(child, DW_AT_data_member_location)) {
435 if (type->type != DW_TAG_union_type) {
437 "Missing DW_AT_data_member_location field in DW_TAG_member %s of type <%p>%s",
438 member->name, type->id, type->name);
444 Dwarf_Attribute attr;
445 dwarf_attr_integrate(child, DW_AT_data_member_location, &attr);
446 int form = dwarf_whatform(&attr);
447 int klass = MC_dwarf_form_get_class(form);
449 case MC_DW_CLASS_EXPRLOC:
450 case MC_DW_CLASS_BLOCK:
451 // Location expression:
455 if (dwarf_getlocation(&attr, &expr, &len)) {
457 "Could not read location expression DW_AT_data_member_location in DW_TAG_member %s of type <%p>%s",
458 MC_dwarf_attr_integrate_string(child, DW_AT_name),
459 type->id, type->name);
461 if (len==1 && expr[0].atom == DW_OP_plus_uconst) {
462 member->offset = expr[0].number;
464 mc_dwarf_expression_init(&member->location, len, expr);
468 case MC_DW_CLASS_CONSTANT:
469 // Offset from the base address of the object:
472 if (!dwarf_formudata(&attr, &offset))
473 member->offset = offset;
475 xbt_die("Cannot get %s location <%p>%s",
476 MC_dwarf_attr_integrate_string(child, DW_AT_name),
477 type->id, type->name);
480 case MC_DW_CLASS_LOCLISTPTR:
481 // Reference to a location list:
483 case MC_DW_CLASS_REFERENCE:
484 // It's supposed to be possible in DWARF2 but I couldn't find its semantic
488 "Can't handle form class (%i) / form 0x%x as DW_AT_member_location",
494 static void dw_type_free_voidp(void *t){
495 dw_type_free((dw_type_t) * (void **) t);
498 /** \brief Populate the list of members of a type
500 * \param info ELF object containing the type DIE
501 * \param die DIE of the type
502 * \param unit DIE of the compilation unit containing the type DIE
503 * \param type the type
505 static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_type_t type) {
508 xbt_assert(!type->members);
509 type->members = xbt_dynar_new(sizeof(dw_type_t), (void(*)(void*))dw_type_free_voidp);
510 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
511 int tag = dwarf_tag(&child);
512 if (tag==DW_TAG_member || tag==DW_TAG_inheritance) {
514 // Skip declarations:
515 if (MC_dwarf_attr_flag(&child, DW_AT_declaration, false))
518 // Skip compile time constants:
519 if(dwarf_hasattr(&child, DW_AT_const_value))
522 // TODO, we should use another type (because is is not a type but a member)
523 dw_type_t member = xbt_new0(s_dw_type_t, 1);
527 member->id = (void *) dwarf_dieoffset(&child);
529 const char* name = MC_dwarf_attr_integrate_string(&child, DW_AT_name);
531 member->name = xbt_strdup(name);
535 member->byte_size = MC_dwarf_attr_integrate_uint(&child, DW_AT_byte_size, 0);
536 member->element_count = -1;
537 member->dw_type_id = MC_dwarf_at_type(&child);
538 member->members = NULL;
539 member->is_pointer_type = 0;
542 if(dwarf_hasattr(&child, DW_AT_data_bit_offset)) {
543 xbt_die("Can't groke DW_AT_data_bit_offset.");
546 MC_dwarf_fill_member_location(type, member, &child);
548 if (!member->dw_type_id) {
549 xbt_die("Missing type for member %s of <%p>%s", member->name, type->id, type->name);
552 xbt_dynar_push(type->members, &member);
557 /** \brief Create a MC type object from a DIE
559 * \param info current object info object
560 * \param DIE (for a given type);
561 * \param unit compilation unit of the current DIE
562 * \return MC representation of the type
564 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) {
566 dw_type_t type = xbt_new0(s_dw_type_t, 1);
571 type->element_count = -1;
572 type->dw_type_id = NULL;
573 type->members = NULL;
574 type->is_pointer_type = 0;
577 type->type = dwarf_tag(die);
580 type->id = (void *) dwarf_dieoffset(die);
582 const char* prefix = "";
583 switch (type->type) {
584 case DW_TAG_structure_type:
587 case DW_TAG_union_type:
590 case DW_TAG_class_type:
597 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
599 type->name = namespace ? bprintf("%s%s::%s", prefix, namespace, name) : bprintf("%s%s", prefix, name);
602 XBT_DEBUG("Processing type <%p>%s", type->id, type->name);
604 type->dw_type_id = MC_dwarf_at_type(die);
606 // Computation of the byte_size;
607 if (dwarf_hasattr_integrate(die, DW_AT_byte_size))
608 type->byte_size = MC_dwarf_attr_integrate_uint(die, DW_AT_byte_size, 0);
609 else if (type->type == DW_TAG_array_type || type->type==DW_TAG_structure_type || type->type==DW_TAG_class_type) {
611 if (dwarf_aggregate_size(die, &size)==0) {
612 type->byte_size = size;
616 switch (type->type) {
617 case DW_TAG_array_type:
618 type->element_count = MC_dwarf_array_element_count(die, unit);
619 // TODO, handle DW_byte_stride and (not) DW_bit_stride
622 case DW_TAG_pointer_type:
623 case DW_TAG_reference_type:
624 case DW_TAG_rvalue_reference_type:
625 type->is_pointer_type = 1;
628 case DW_TAG_structure_type:
629 case DW_TAG_union_type:
630 case DW_TAG_class_type:
631 MC_dwarf_add_members(info, die, unit, type);
632 char* new_namespace = namespace == NULL ? xbt_strdup(type->name)
633 : bprintf("%s::%s", namespace, name);
634 MC_dwarf_handle_children(info, die, unit, frame, new_namespace);
642 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) {
643 dw_type_t type = MC_dwarf_die_to_type(info, die, unit, frame, namespace);
645 char* key = bprintf("%" PRIx64, (uint64_t) type->id);
646 xbt_dict_set(info->types, key, type, NULL);
649 if(type->name && type->byte_size!=0) {
650 xbt_dict_set(info->full_types_by_name, type->name, type, NULL);
654 static int mc_anonymous_variable_index = 0;
656 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) {
657 // Skip declarations:
658 if (MC_dwarf_attr_flag(die, DW_AT_declaration, false))
661 // Skip compile time constants:
662 if(dwarf_hasattr(die, DW_AT_const_value))
665 Dwarf_Attribute attr_location;
666 if (dwarf_attr(die, DW_AT_location, &attr_location)==NULL) {
667 // No location: do not add it ?
671 dw_variable_t variable = xbt_new0(s_dw_variable_t, 1);
672 variable->dwarf_offset = dwarf_dieoffset(die);
673 variable->global = frame == NULL; // Can be override base on DW_AT_location
675 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
676 variable->name = xbt_strdup(name);
678 variable->type_origin = MC_dwarf_at_type(die);
680 int form = dwarf_whatform(&attr_location);
681 int klass = form == DW_FORM_sec_offset ? MC_DW_CLASS_CONSTANT : MC_dwarf_form_get_class(form);
683 case MC_DW_CLASS_EXPRLOC:
684 case MC_DW_CLASS_BLOCK:
685 // Location expression:
689 if (dwarf_getlocation(&attr_location, &expr, &len)) {
691 "Could not read location expression in DW_AT_location of variable <%p>%s",
692 (void*) variable->dwarf_offset, variable->name);
695 if (len==1 && expr[0].atom == DW_OP_addr) {
696 variable->global = 1;
697 Dwarf_Off offset = expr[0].number;
698 // TODO, Why is this different base on the object?
699 Dwarf_Off base = strcmp(info->file_name, xbt_binary_name) !=0 ? (Dwarf_Off) info->start_exec : 0;
700 variable->address = (void*) (base + offset);
702 mc_dwarf_location_list_init_from_expression(&variable->locations, len, expr);
707 case MC_DW_CLASS_LOCLISTPTR:
708 case MC_DW_CLASS_CONSTANT:
709 // Reference to location list:
710 mc_dwarf_location_list_init(&variable->locations, info, die, &attr_location);
713 xbt_die("Unexpected form 0x%x (%i), class 0x%x (%i) list for location in <%p>%s",
714 form, form, klass, klass, (void*) variable->dwarf_offset, variable->name);
717 // Handle start_scope:
718 if (dwarf_hasattr(die, DW_AT_start_scope)) {
719 Dwarf_Attribute attr;
720 dwarf_attr(die, DW_AT_start_scope, &attr);
721 int form = dwarf_whatform(&attr);
722 int klass = MC_dwarf_form_get_class(form);
724 case MC_DW_CLASS_CONSTANT:
727 variable->start_scope = dwarf_formudata(&attr, &value) == 0 ? (size_t) value : 0;
731 xbt_die("Unhandled form 0x%x, class 0x%X for DW_AT_start_scope of variable %s",
732 form, klass, name==NULL ? "?" : name);
736 if(namespace && variable->global) {
737 char* old_name = variable->name;
738 variable->name = bprintf("%s::%s", namespace, old_name);
742 // The current code needs a variable name,
743 // generate a fake one:
744 if(!variable->name) {
745 variable->name = bprintf("@anonymous#%i", mc_anonymous_variable_index++);
751 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) {
752 dw_variable_t variable = MC_die_to_variable(info, die, unit, frame, namespace);
755 MC_dwarf_register_variable(info, frame, variable);
758 static void MC_dwarf_handle_subprogram_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t parent_frame, const char* namespace) {
760 // (Template) Subprogram declaration:
761 if (MC_dwarf_attr_flag(die, DW_AT_declaration, false))
764 dw_frame_t frame = xbt_new0(s_dw_frame_t, 1);
766 frame->start = dwarf_dieoffset(die);
768 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
769 frame->name = namespace ? bprintf("%s::%s", namespace, name) : xbt_strdup(name);
771 // This is the base address for DWARF addresses.
772 // Relocated addresses are offset from this base address.
773 // See DWARF4 spec 7.5
774 void* base = info->flags & MC_OBJECT_INFO_EXECUTABLE ? 0 : MC_object_base_address(info);
776 // Variables are filled in the (recursive) call of MC_dwarf_handle_children:
777 frame->variables = xbt_dynar_new(sizeof(dw_variable_t), dw_variable_free_voidp);
778 frame->high_pc = ((char*) base) + MC_dwarf_attr_integrate_addr(die, DW_AT_high_pc);
779 frame->low_pc = ((char*) base) + MC_dwarf_attr_integrate_addr(die, DW_AT_low_pc);
781 Dwarf_Attribute attr_frame_base;
782 if (dwarf_attr_integrate(die, DW_AT_frame_base, &attr_frame_base))
783 mc_dwarf_location_list_init(&frame->frame_base, info, die, &attr_frame_base);
785 frame->end = -1; // This one is now useless:
788 char* key = bprintf("%" PRIx64, (uint64_t) frame->start);
789 xbt_dict_set(info->subprograms, key, frame, NULL);
793 MC_dwarf_handle_children(info, die, unit, frame, namespace);
796 static void mc_dwarf_handle_namespace_die(
797 mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
798 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
800 xbt_die("Unexpected namespace in a subprogram");
801 char* new_namespace = namespace == NULL ? xbt_strdup(name)
802 : bprintf("%s::%s", namespace, name);
803 MC_dwarf_handle_children(info, die, unit, frame, new_namespace);
804 xbt_free(new_namespace);
807 static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
808 // For each child DIE:
811 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
812 MC_dwarf_handle_die(info, &child, unit, frame, namespace);
816 static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
817 int tag = dwarf_tag(die);
818 mc_tag_class klass = MC_dwarf_tag_classify(tag);
823 MC_dwarf_handle_type_die(info, die, unit, frame, namespace);
827 case mc_tag_subprogram:
828 MC_dwarf_handle_subprogram_die(info, die, unit, frame, namespace);
832 case mc_tag_variable:
833 MC_dwarf_handle_variable_die(info, die, unit, frame, namespace);
841 case mc_tag_namespace:
842 mc_dwarf_handle_namespace_die(info, die, unit, frame, namespace);
851 /** \brief Populate the debugging informations of the given ELF object
853 * Read the DWARf information of the EFFL object and populate the
854 * lists of types, variables, functions.
856 void MC_dwarf_get_variables(mc_object_info_t info) {
857 int fd = open(info->file_name, O_RDONLY);
859 xbt_die("Could not open file %s", info->file_name);
861 Dwarf *dwarf = dwarf_begin(fd, DWARF_C_READ);
863 xbt_die("Your program must be compiled with -g");
866 // For each compilation unit:
867 Dwarf_Off offset = 0;
868 Dwarf_Off next_offset = 0;
870 while (dwarf_nextcu (dwarf, offset, &next_offset, &length, NULL, NULL, NULL) == 0) {
872 if(dwarf_offdie(dwarf, offset+length, &unit_die)!=NULL) {
874 // For each child DIE:
877 for (res=dwarf_child(&unit_die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
878 MC_dwarf_handle_die(info, &child, &unit_die, NULL, NULL);
882 offset = next_offset;