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. */
7 #define DW_LANG_Objc DW_LANG_ObjC /* fix spelling error in older dwarf.h */
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, const char* namespace);
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, dw_frame_t frame, const char* namespace);
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, const char* namespace);
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, const char* namespace);
78 /** \brief Get the DW_TAG_type of the DIE
81 * \return DW_TAG_type attribute as a new string (NULL if none)
83 static char* MC_dwarf_at_type(Dwarf_Die* die);
85 /** \brief Get the name of an attribute (DW_AT_*) from its code
87 * \param attr attribute code (see the DWARF specification)
88 * \return name of the attribute
90 const char* MC_dwarf_attrname(int attr) {
92 #include "mc_dwarf_attrnames.h"
94 return "DW_AT_unknown";
98 /** \brief Get the name of a dwarf tag (DW_TAG_*) from its code
100 * \param tag tag code (see the DWARF specification)
101 * \return name of the tag
103 const char* MC_dwarf_tagname(int tag) {
105 #include "mc_dwarf_tagnames.h"
107 return "DW_TAG_invalid";
109 return "DW_TAG_unknown";
113 /** \brief A class of DWARF tags (DW_TAG_*)
115 typedef enum mc_tag_class {
124 static mc_tag_class MC_dwarf_tag_classify(int tag) {
127 case DW_TAG_array_type:
128 case DW_TAG_class_type:
129 case DW_TAG_enumeration_type:
131 case DW_TAG_pointer_type:
132 case DW_TAG_reference_type:
133 case DW_TAG_rvalue_reference_type:
134 case DW_TAG_string_type:
135 case DW_TAG_structure_type:
136 case DW_TAG_subroutine_type:
137 case DW_TAG_union_type:
138 case DW_TAG_ptr_to_member_type:
139 case DW_TAG_set_type:
140 case DW_TAG_subrange_type:
141 case DW_TAG_base_type:
142 case DW_TAG_const_type:
143 case DW_TAG_file_type:
144 case DW_TAG_packed_type:
145 case DW_TAG_volatile_type:
146 case DW_TAG_restrict_type:
147 case DW_TAG_interface_type:
148 case DW_TAG_unspecified_type:
149 case DW_TAG_mutable_type:
150 case DW_TAG_shared_type:
153 case DW_TAG_subprogram:
154 return mc_tag_subprogram;
156 case DW_TAG_variable:
157 case DW_TAG_formal_parameter:
158 return mc_tag_variable;
160 case DW_TAG_lexical_block:
161 case DW_TAG_try_block:
162 case DW_TAG_catch_block:
163 case DW_TAG_inlined_subroutine:
164 case DW_TAG_with_stmt:
167 case DW_TAG_namespace:
168 return mc_tag_namespace;
171 return mc_tag_unknown;
176 #define MC_DW_CLASS_UNKNOWN 0
177 #define MC_DW_CLASS_ADDRESS 1 // Location in the address space of the program
178 #define MC_DW_CLASS_BLOCK 2 // Arbitrary block of bytes
179 #define MC_DW_CLASS_CONSTANT 3
180 #define MC_DW_CLASS_STRING 3 // String
181 #define MC_DW_CLASS_FLAG 4 // Boolean
182 #define MC_DW_CLASS_REFERENCE 5 // Reference to another DIE
183 #define MC_DW_CLASS_EXPRLOC 6 // DWARF expression/location description
184 #define MC_DW_CLASS_LINEPTR 7
185 #define MC_DW_CLASS_LOCLISTPTR 8
186 #define MC_DW_CLASS_MACPTR 9
187 #define MC_DW_CLASS_RANGELISTPTR 10
189 /** \brief Find the DWARF data class for a given DWARF data form
191 * This mapping is defined in the DWARF spec.
193 * \param form The form (values taken from the DWARF spec)
194 * \return An internal representation for the corresponding class
196 static int MC_dwarf_form_get_class(int form) {
199 return MC_DW_CLASS_ADDRESS;
204 return MC_DW_CLASS_BLOCK;
211 return MC_DW_CLASS_CONSTANT;
214 return MC_DW_CLASS_STRING;
215 case DW_FORM_ref_addr:
220 case DW_FORM_ref_udata:
221 return MC_DW_CLASS_REFERENCE;
223 case DW_FORM_flag_present:
224 return MC_DW_CLASS_FLAG;
225 case DW_FORM_exprloc:
226 return MC_DW_CLASS_EXPRLOC;
230 return MC_DW_CLASS_UNKNOWN;
234 /** \brief Get the name of the tag of a given DIE
237 * \return name of the tag of this DIE
239 static inline const char* MC_dwarf_die_tagname(Dwarf_Die* die) {
240 return MC_dwarf_tagname(dwarf_tag(die));
245 /** \brief Get an attribute of a given DIE as a string
248 * \param attribute attribute
249 * \return value of the given attribute of the given DIE
251 static const char* MC_dwarf_attr_integrate_string(Dwarf_Die* die, int attribute) {
252 Dwarf_Attribute attr;
253 if (!dwarf_attr_integrate(die, attribute, &attr)) {
256 return dwarf_formstring(&attr);
260 /** \brief Get the linkage name of a DIE.
262 * Use either DW_AT_linkage_name or DW_AT_MIPS_linkage_name.
263 * DW_AT_linkage_name is standardized since DWARF 4.
264 * Before this version of DWARF, the MIPS extensions
265 * DW_AT_MIPS_linkage_name is used (at least by GCC).
268 * \return linkage name of the given DIE (or NULL)
270 static const char* MC_dwarf_at_linkage_name(Dwarf_Die* die) {
271 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_linkage_name);
273 name = MC_dwarf_attr_integrate_string(die, DW_AT_MIPS_linkage_name);
277 static Dwarf_Off MC_dwarf_attr_dieoffset(Dwarf_Die* die, int attribute) {
278 Dwarf_Attribute attr;
279 if (dwarf_hasattr_integrate(die, attribute)) {
280 dwarf_attr_integrate(die, attribute, &attr);
281 Dwarf_Die subtype_die;
282 if (dwarf_formref_die(&attr, &subtype_die)==NULL) {
283 xbt_die("Could not find DIE");
285 return dwarf_dieoffset(&subtype_die);
290 static Dwarf_Off MC_dwarf_attr_integrate_dieoffset(Dwarf_Die* die, int attribute) {
291 Dwarf_Attribute attr;
292 if (dwarf_hasattr_integrate(die, attribute)) {
293 dwarf_attr_integrate(die, DW_AT_type, &attr);
294 Dwarf_Die subtype_die;
295 if (dwarf_formref_die(&attr, &subtype_die)==NULL) {
296 xbt_die("Could not find DIE");
298 return dwarf_dieoffset(&subtype_die);
303 /** \brief Find the type/subtype (DW_AT_type) for a DIE
306 * \return DW_AT_type reference as a global offset in hexadecimal (or NULL)
308 static char* MC_dwarf_at_type(Dwarf_Die* die) {
309 Dwarf_Off offset = MC_dwarf_attr_integrate_dieoffset(die, DW_AT_type);
310 return offset == 0 ? NULL : bprintf("%" PRIx64 , offset);
313 static uint64_t MC_dwarf_attr_integrate_addr(Dwarf_Die* die, int attribute) {
314 Dwarf_Attribute attr;
315 if(dwarf_attr_integrate(die, attribute, &attr)==NULL)
318 if (dwarf_formaddr(&attr, &value) == 0)
319 return (uint64_t) value;
324 static uint64_t MC_dwarf_attr_integrate_uint(Dwarf_Die* die, int attribute, uint64_t default_value) {
325 Dwarf_Attribute attr;
326 if (dwarf_attr_integrate(die, attribute, &attr)==NULL)
327 return default_value;
329 return dwarf_formudata(dwarf_attr_integrate(die, attribute, &attr), &value) == 0 ? (uint64_t) value : default_value;
332 static bool MC_dwarf_attr_flag(Dwarf_Die* die, int attribute, bool integrate) {
333 Dwarf_Attribute attr;
334 if ((integrate ? dwarf_attr_integrate(die, attribute, &attr)
335 : dwarf_attr(die, attribute, &attr))==0)
339 if (dwarf_formflag(&attr, &result))
340 xbt_die("Unexpected form for attribute %s",
341 MC_dwarf_attrname(attribute));
345 /** \brief Find the default lower bound for a given language
347 * The default lower bound of an array (when DW_TAG_lower_bound
348 * is missing) depends on the language of the compilation unit.
350 * \param lang Language of the compilation unit (values defined in the DWARF spec)
351 * \return Default lower bound of an array in this compilation unit
353 static uint64_t MC_dwarf_default_lower_bound(int lang) {
358 case DW_LANG_C_plus_plus:
362 case DW_LANG_ObjC_plus_plus:
368 case DW_LANG_Fortran77:
369 case DW_LANG_Fortran90:
370 case DW_LANG_Fortran95:
371 case DW_LANG_Modula2:
372 case DW_LANG_Pascal83:
374 case DW_LANG_Cobol74:
375 case DW_LANG_Cobol85:
378 xbt_die("No default DW_TAG_lower_bound for language %i and none given", lang);
383 /** \brief Finds the number of elements in a DW_TAG_subrange_type or DW_TAG_enumeration_type DIE
386 * \param unit DIE of the compilation unit
387 * \return number of elements in the range
389 static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
390 xbt_assert(dwarf_tag(die)==DW_TAG_enumeration_type ||dwarf_tag(die)==DW_TAG_subrange_type,
391 "MC_dwarf_subrange_element_count called with DIE of type %s", MC_dwarf_die_tagname(die));
393 // Use DW_TAG_count if present:
394 if (dwarf_hasattr_integrate(die, DW_AT_count)) {
395 return MC_dwarf_attr_integrate_uint(die, DW_AT_count, 0);
398 // Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound + 1:
400 if (!dwarf_hasattr_integrate(die, DW_AT_upper_bound)) {
401 // This is not really 0, but the code expects this (we do not know):
404 uint64_t upper_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_upper_bound, -1);
406 uint64_t lower_bound = 0;
407 if (dwarf_hasattr_integrate(die, DW_AT_lower_bound)) {
408 lower_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_lower_bound, -1);
410 lower_bound = MC_dwarf_default_lower_bound(dwarf_srclang(unit));
412 return upper_bound - lower_bound + 1;
415 /** \brief Finds the number of elements in a array type (DW_TAG_array_type)
417 * The compilation unit might be needed because the default lower
418 * bound depends on the language of the compilation unit.
420 * \param die the DIE of the DW_TAG_array_type
421 * \param unit the DIE of the compilation unit
422 * \return number of elements in this array type
424 static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit) {
425 xbt_assert(dwarf_tag(die)==DW_TAG_array_type,
426 "MC_dwarf_array_element_count called with DIE of type %s", MC_dwarf_die_tagname(die));
431 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
432 int child_tag = dwarf_tag(&child);
433 if (child_tag==DW_TAG_subrange_type ||child_tag==DW_TAG_enumeration_type) {
434 result *= MC_dwarf_subrange_element_count(&child, unit);
442 /** \brief Initialize the location of a member of a type
443 * (DW_AT_data_member_location of a DW_TAG_member).
445 * \param type a type (struct, class)
446 * \param member the member of the type
447 * \param child DIE of the member (DW_TAG_member)
449 static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwarf_Die* child) {
450 if (dwarf_hasattr(child, DW_AT_data_bit_offset)) {
451 xbt_die("Can't groke DW_AT_data_bit_offset.");
454 if (!dwarf_hasattr_integrate(child, DW_AT_data_member_location)) {
455 if (type->type != DW_TAG_union_type) {
457 "Missing DW_AT_data_member_location field in DW_TAG_member %s of type <%"PRIx64">%s",
458 member->name, (uint64_t) type->id, type->name);
464 Dwarf_Attribute attr;
465 dwarf_attr_integrate(child, DW_AT_data_member_location, &attr);
466 int form = dwarf_whatform(&attr);
467 int klass = MC_dwarf_form_get_class(form);
469 case MC_DW_CLASS_EXPRLOC:
470 case MC_DW_CLASS_BLOCK:
471 // Location expression:
475 if (dwarf_getlocation(&attr, &expr, &len)) {
477 "Could not read location expression DW_AT_data_member_location in DW_TAG_member %s of type <%"PRIx64">%s",
478 MC_dwarf_attr_integrate_string(child, DW_AT_name),
479 (uint64_t) type->id, type->name);
481 if (len==1 && expr[0].atom == DW_OP_plus_uconst) {
482 member->offset = expr[0].number;
484 mc_dwarf_expression_init(&member->location, len, expr);
488 case MC_DW_CLASS_CONSTANT:
489 // Offset from the base address of the object:
492 if (!dwarf_formudata(&attr, &offset))
493 member->offset = offset;
495 xbt_die("Cannot get %s location <%"PRIx64">%s",
496 MC_dwarf_attr_integrate_string(child, DW_AT_name),
497 (uint64_t) type->id, type->name);
500 case MC_DW_CLASS_LOCLISTPTR:
501 // Reference to a location list:
503 case MC_DW_CLASS_REFERENCE:
504 // It's supposed to be possible in DWARF2 but I couldn't find its semantic
508 "Can't handle form class (%i) / form 0x%x as DW_AT_member_location",
514 static void dw_type_free_voidp(void *t){
515 dw_type_free((dw_type_t) * (void **) t);
518 /** \brief Populate the list of members of a type
520 * \param info ELF object containing the type DIE
521 * \param die DIE of the type
522 * \param unit DIE of the compilation unit containing the type DIE
523 * \param type the type
525 static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_type_t type) {
528 xbt_assert(!type->members);
529 type->members = xbt_dynar_new(sizeof(dw_type_t), (void(*)(void*))dw_type_free_voidp);
530 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
531 int tag = dwarf_tag(&child);
532 if (tag==DW_TAG_member || tag==DW_TAG_inheritance) {
534 // Skip declarations:
535 if (MC_dwarf_attr_flag(&child, DW_AT_declaration, false))
538 // Skip compile time constants:
539 if(dwarf_hasattr(&child, DW_AT_const_value))
542 // TODO, we should use another type (because is is not a type but a member)
543 dw_type_t member = xbt_new0(s_dw_type_t, 1);
547 member->id = dwarf_dieoffset(&child);
549 const char* name = MC_dwarf_attr_integrate_string(&child, DW_AT_name);
551 member->name = xbt_strdup(name);
555 member->byte_size = MC_dwarf_attr_integrate_uint(&child, DW_AT_byte_size, 0);
556 member->element_count = -1;
557 member->dw_type_id = MC_dwarf_at_type(&child);
558 member->members = NULL;
559 member->is_pointer_type = 0;
562 if(dwarf_hasattr(&child, DW_AT_data_bit_offset)) {
563 xbt_die("Can't groke DW_AT_data_bit_offset.");
566 MC_dwarf_fill_member_location(type, member, &child);
568 if (!member->dw_type_id) {
569 xbt_die("Missing type for member %s of <%"PRIx64">%s", member->name, (uint64_t) type->id, type->name);
572 xbt_dynar_push(type->members, &member);
577 /** \brief Create a MC type object from a DIE
579 * \param info current object info object
580 * \param DIE (for a given type);
581 * \param unit compilation unit of the current DIE
582 * \return MC representation of the type
584 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) {
586 dw_type_t type = xbt_new0(s_dw_type_t, 1);
591 type->element_count = -1;
592 type->dw_type_id = NULL;
593 type->members = NULL;
594 type->is_pointer_type = 0;
597 type->type = dwarf_tag(die);
600 type->id = dwarf_dieoffset(die);
602 const char* prefix = "";
603 switch (type->type) {
604 case DW_TAG_structure_type:
607 case DW_TAG_union_type:
610 case DW_TAG_class_type:
617 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
619 type->name = namespace ? bprintf("%s%s::%s", prefix, namespace, name) : bprintf("%s%s", prefix, name);
622 type->dw_type_id = MC_dwarf_at_type(die);
624 // Computation of the byte_size;
625 if (dwarf_hasattr_integrate(die, DW_AT_byte_size))
626 type->byte_size = MC_dwarf_attr_integrate_uint(die, DW_AT_byte_size, 0);
627 else if (type->type == DW_TAG_array_type || type->type==DW_TAG_structure_type || type->type==DW_TAG_class_type) {
629 if (dwarf_aggregate_size(die, &size)==0) {
630 type->byte_size = size;
634 switch (type->type) {
635 case DW_TAG_array_type:
636 type->element_count = MC_dwarf_array_element_count(die, unit);
637 // TODO, handle DW_byte_stride and (not) DW_bit_stride
640 case DW_TAG_pointer_type:
641 case DW_TAG_reference_type:
642 case DW_TAG_rvalue_reference_type:
643 type->is_pointer_type = 1;
646 case DW_TAG_structure_type:
647 case DW_TAG_union_type:
648 case DW_TAG_class_type:
649 MC_dwarf_add_members(info, die, unit, type);
650 char* new_namespace = namespace == NULL ? xbt_strdup(type->name)
651 : bprintf("%s::%s", namespace, name);
652 MC_dwarf_handle_children(info, die, unit, frame, new_namespace);
660 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) {
661 dw_type_t type = MC_dwarf_die_to_type(info, die, unit, frame, namespace);
663 char* key = bprintf("%" PRIx64, (uint64_t) type->id);
664 xbt_dict_set(info->types, key, type, NULL);
667 if(type->name && type->byte_size!=0) {
668 xbt_dict_set(info->full_types_by_name, type->name, type, NULL);
672 static int mc_anonymous_variable_index = 0;
674 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) {
675 // Skip declarations:
676 if (MC_dwarf_attr_flag(die, DW_AT_declaration, false))
679 // Skip compile time constants:
680 if(dwarf_hasattr(die, DW_AT_const_value))
683 Dwarf_Attribute attr_location;
684 if (dwarf_attr(die, DW_AT_location, &attr_location)==NULL) {
685 // No location: do not add it ?
689 dw_variable_t variable = xbt_new0(s_dw_variable_t, 1);
690 variable->dwarf_offset = dwarf_dieoffset(die);
691 variable->global = frame == NULL; // Can be override base on DW_AT_location
692 variable->object_info = info;
694 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
695 variable->name = xbt_strdup(name);
697 variable->type_origin = MC_dwarf_at_type(die);
699 int form = dwarf_whatform(&attr_location);
700 int klass = form == DW_FORM_sec_offset ? MC_DW_CLASS_CONSTANT : MC_dwarf_form_get_class(form);
702 case MC_DW_CLASS_EXPRLOC:
703 case MC_DW_CLASS_BLOCK:
704 // Location expression:
708 if (dwarf_getlocation(&attr_location, &expr, &len)) {
710 "Could not read location expression in DW_AT_location of variable <%"PRIx64">%s",
711 (uint64_t) variable->dwarf_offset, variable->name);
714 if (len==1 && expr[0].atom == DW_OP_addr) {
715 variable->global = 1;
716 uintptr_t offset = (uintptr_t) expr[0].number;
717 uintptr_t base = (uintptr_t) MC_object_base_address(info);
718 variable->address = (void*) (base + offset);
720 mc_dwarf_location_list_init_from_expression(&variable->locations, len, expr);
725 case MC_DW_CLASS_LOCLISTPTR:
726 case MC_DW_CLASS_CONSTANT:
727 // Reference to location list:
728 mc_dwarf_location_list_init(&variable->locations, info, die, &attr_location);
731 xbt_die("Unexpected form 0x%x (%i), class 0x%x (%i) list for location in <%"PRIx64">%s",
732 form, form, klass, klass, (uint64_t) variable->dwarf_offset, variable->name);
735 // Handle start_scope:
736 if (dwarf_hasattr(die, DW_AT_start_scope)) {
737 Dwarf_Attribute attr;
738 dwarf_attr(die, DW_AT_start_scope, &attr);
739 int form = dwarf_whatform(&attr);
740 int klass = MC_dwarf_form_get_class(form);
742 case MC_DW_CLASS_CONSTANT:
745 variable->start_scope = dwarf_formudata(&attr, &value) == 0 ? (size_t) value : 0;
748 case MC_DW_CLASS_RANGELISTPTR: // TODO
750 xbt_die("Unhandled form 0x%x, class 0x%X for DW_AT_start_scope of variable %s",
751 form, klass, name==NULL ? "?" : name);
755 if(namespace && variable->global) {
756 char* old_name = variable->name;
757 variable->name = bprintf("%s::%s", namespace, old_name);
761 // The current code needs a variable name,
762 // generate a fake one:
763 if(!variable->name) {
764 variable->name = bprintf("@anonymous#%i", mc_anonymous_variable_index++);
770 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) {
771 dw_variable_t variable = MC_die_to_variable(info, die, unit, frame, namespace);
774 MC_dwarf_register_variable(info, frame, variable);
777 static void mc_frame_free_voipd(dw_frame_t* p) {
782 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) {
783 // TODO, handle DW_TAG_type/DW_TAG_location for DW_TAG_with_stmt
784 int tag = dwarf_tag(die);
785 mc_tag_class klass = MC_dwarf_tag_classify(tag);
787 // (Template) Subprogram declaration:
788 if(klass==mc_tag_subprogram && MC_dwarf_attr_flag(die, DW_AT_declaration, false))
791 if(klass==mc_tag_scope)
792 xbt_assert(parent_frame, "No parent scope for this scope");
794 dw_frame_t frame = xbt_new0(s_dw_frame_t, 1);
797 frame->id = dwarf_dieoffset(die);
798 frame->object_info = info;
800 if(klass==mc_tag_subprogram) {
801 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
802 frame->name = namespace ? bprintf("%s::%s", namespace, name) : xbt_strdup(name);
805 frame->abstract_origin_id = MC_dwarf_attr_dieoffset(die, DW_AT_abstract_origin);
807 // This is the base address for DWARF addresses.
808 // Relocated addresses are offset from this base address.
809 // See DWARF4 spec 7.5
810 void* base = MC_object_base_address(info);
812 // Variables are filled in the (recursive) call of MC_dwarf_handle_children:
813 frame->variables = xbt_dynar_new(sizeof(dw_variable_t), dw_variable_free_voidp);
815 // TODO, support DW_AT_ranges
816 uint64_t low_pc = MC_dwarf_attr_integrate_addr(die, DW_AT_low_pc);
817 frame->low_pc = low_pc ? ((char*) base) + low_pc : 0;
820 Dwarf_Attribute attr;
821 if(!dwarf_attr_integrate(die, DW_AT_high_pc, &attr)) {
822 xbt_die("Missing DW_AT_high_pc matching with DW_AT_low_pc");
828 switch(MC_dwarf_form_get_class(dwarf_whatform(&attr))) {
830 // DW_AT_high_pc if an offset from the low_pc:
831 case MC_DW_CLASS_CONSTANT:
833 if (dwarf_formsdata(&attr, &offset) !=0)
834 xbt_die("Could not read constant");
835 frame->high_pc = (void*) ((char*)frame->low_pc + offset);
838 // DW_AT_high_pc is a relocatable address:
839 case MC_DW_CLASS_ADDRESS:
840 if (dwarf_formaddr(&attr, &high_pc) != 0)
841 xbt_die("Could not read address");
842 frame->high_pc = ((char*) base) + high_pc;
846 xbt_die("Unexpected class for DW_AT_high_pc");
851 if(klass==mc_tag_subprogram) {
852 Dwarf_Attribute attr_frame_base;
853 if (dwarf_attr_integrate(die, DW_AT_frame_base, &attr_frame_base))
854 mc_dwarf_location_list_init(&frame->frame_base, info, die, &attr_frame_base);
857 frame->scopes = xbt_dynar_new(sizeof(dw_frame_t), (void_f_pvoid_t) mc_frame_free_voipd);
860 if(klass==mc_tag_subprogram) {
861 char* key = bprintf("%" PRIx64, (uint64_t) frame->id);
862 xbt_dict_set(info->subprograms, key, frame, NULL);
864 } else if(klass==mc_tag_scope) {
865 xbt_dynar_push(parent_frame->scopes, &frame);
869 MC_dwarf_handle_children(info, die, unit, frame, namespace);
872 static void mc_dwarf_handle_namespace_die(
873 mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
874 const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
876 xbt_die("Unexpected namespace in a subprogram");
877 char* new_namespace = namespace == NULL ? xbt_strdup(name)
878 : bprintf("%s::%s", namespace, name);
879 MC_dwarf_handle_children(info, die, unit, frame, new_namespace);
880 xbt_free(new_namespace);
883 static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
884 // For each child DIE:
887 for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
888 MC_dwarf_handle_die(info, &child, unit, frame, namespace);
892 static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) {
893 int tag = dwarf_tag(die);
894 mc_tag_class klass = MC_dwarf_tag_classify(tag);
899 MC_dwarf_handle_type_die(info, die, unit, frame, namespace);
902 // Subprogram or scope:
903 case mc_tag_subprogram:
905 MC_dwarf_handle_scope_die(info, die, unit, frame, namespace);
909 case mc_tag_variable:
910 MC_dwarf_handle_variable_die(info, die, unit, frame, namespace);
913 case mc_tag_namespace:
914 mc_dwarf_handle_namespace_die(info, die, unit, frame, namespace);
923 /** \brief Populate the debugging informations of the given ELF object
925 * Read the DWARf information of the EFFL object and populate the
926 * lists of types, variables, functions.
928 void MC_dwarf_get_variables(mc_object_info_t info) {
929 int fd = open(info->file_name, O_RDONLY);
931 xbt_die("Could not open file %s", info->file_name);
933 Dwarf *dwarf = dwarf_begin(fd, DWARF_C_READ);
935 xbt_die("Your program must be compiled with -g");
938 // For each compilation unit:
939 Dwarf_Off offset = 0;
940 Dwarf_Off next_offset = 0;
942 while (dwarf_nextcu (dwarf, offset, &next_offset, &length, NULL, NULL, NULL) == 0) {
944 if(dwarf_offdie(dwarf, offset+length, &unit_die)!=NULL) {
946 // For each child DIE:
949 for (res=dwarf_child(&unit_die, &child); res==0; res=dwarf_siblingof(&child,&child)) {
950 MC_dwarf_handle_die(info, &child, &unit_die, NULL, NULL);
954 offset = next_offset;