X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/f18d5d8bed04f41a0de4b82893528d9df02b9d1e..f9e6853d2c5b7b867211700bc12f0ee57f640b30:/src/mc/mc_dwarf.c diff --git a/src/mc/mc_dwarf.c b/src/mc/mc_dwarf.c index 5b8700ca9a..253350064e 100644 --- a/src/mc/mc_dwarf.c +++ b/src/mc/mc_dwarf.c @@ -158,7 +158,9 @@ static mc_tag_class MC_dwarf_tag_classify(int tag) { case DW_TAG_lexical_block: case DW_TAG_try_block: + case DW_TAG_catch_block: case DW_TAG_inlined_subroutine: + case DW_TAG_with_stmt: return mc_tag_scope; case DW_TAG_namespace: @@ -183,6 +185,13 @@ static mc_tag_class MC_dwarf_tag_classify(int tag) { #define MC_DW_CLASS_MACPTR 9 #define MC_DW_CLASS_RANGELISTPTR 10 +/** \brief Find the DWARF data class for a given DWARF data form + * + * This mapping is defined in the DWARF spec. + * + * \param form The form (values taken from the DWARF spec) + * \return An internal representation for the corresponding class + * */ static int MC_dwarf_form_get_class(int form) { switch(form) { case DW_FORM_addr: @@ -234,11 +243,11 @@ static inline const char* MC_dwarf_die_tagname(Dwarf_Die* die) { /** \brief Get an attribute of a given DIE as a string * - * \param the DIE + * \param die the DIE * \param attribute attribute * \return value of the given attribute of the given DIE */ -static const char* MC_dwarf_attr_string(Dwarf_Die* die, int attribute) { +static const char* MC_dwarf_attr_integrate_string(Dwarf_Die* die, int attribute) { Dwarf_Attribute attr; if (!dwarf_attr_integrate(die, attribute, &attr)) { return NULL; @@ -249,33 +258,58 @@ static const char* MC_dwarf_attr_string(Dwarf_Die* die, int attribute) { /** \brief Get the linkage name of a DIE. * - * Use either DW_AT_linkage_name or DW_AR_MIPS_linkage_name. + * Use either DW_AT_linkage_name or DW_AT_MIPS_linkage_name. + * DW_AT_linkage_name is standardized since DWARF 4. + * Before this version of DWARF, the MIPS extensions + * DW_AT_MIPS_linkage_name is used (at least by GCC). * - * \param DIE + * \param the DIE * \return linkage name of the given DIE (or NULL) * */ static const char* MC_dwarf_at_linkage_name(Dwarf_Die* die) { - const char* name = MC_dwarf_attr_string(die, DW_AT_linkage_name); + const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_linkage_name); if (!name) - name = MC_dwarf_attr_string(die, DW_AT_MIPS_linkage_name); + name = MC_dwarf_attr_integrate_string(die, DW_AT_MIPS_linkage_name); return name; } -static char* MC_dwarf_at_type(Dwarf_Die* die) { +static Dwarf_Off MC_dwarf_attr_dieoffset(Dwarf_Die* die, int attribute) { + Dwarf_Attribute attr; + if (dwarf_hasattr_integrate(die, attribute)) { + dwarf_attr_integrate(die, attribute, &attr); + Dwarf_Die subtype_die; + if (dwarf_formref_die(&attr, &subtype_die)==NULL) { + xbt_die("Could not find DIE"); + } + return dwarf_dieoffset(&subtype_die); + } + else return 0; +} + +static Dwarf_Off MC_dwarf_attr_integrate_dieoffset(Dwarf_Die* die, int attribute) { Dwarf_Attribute attr; - if (dwarf_hasattr_integrate(die, DW_AT_type)) { - dwarf_attr_integrate(die, DW_AT_type, &attr); - Dwarf_Die subtype_die; - if (dwarf_formref_die(&attr, &subtype_die)==NULL) { - xbt_die("Could not find DIE for type"); - } - Dwarf_Off subtype_global_offset = dwarf_dieoffset(&subtype_die); - return bprintf("%" PRIx64 , subtype_global_offset); - } - else return NULL; + if (dwarf_hasattr_integrate(die, attribute)) { + dwarf_attr_integrate(die, DW_AT_type, &attr); + Dwarf_Die subtype_die; + if (dwarf_formref_die(&attr, &subtype_die)==NULL) { + xbt_die("Could not find DIE"); + } + return dwarf_dieoffset(&subtype_die); + } + else return 0; +} + +/** \brief Find the type/subtype (DW_AT_type) for a DIE + * + * \param dit the DIE + * \return DW_AT_type reference as a global offset in hexadecimal (or NULL) + */ +static char* MC_dwarf_at_type(Dwarf_Die* die) { + Dwarf_Off offset = MC_dwarf_attr_integrate_dieoffset(die, DW_AT_type); + return offset == 0 ? NULL : bprintf("%" PRIx64 , offset); } -static uint64_t MC_dwarf_attr_addr(Dwarf_Die* die, int attribute) { +static uint64_t MC_dwarf_attr_integrate_addr(Dwarf_Die* die, int attribute) { Dwarf_Attribute attr; if(dwarf_attr_integrate(die, attribute, &attr)==NULL) return 0; @@ -286,7 +320,7 @@ static uint64_t MC_dwarf_attr_addr(Dwarf_Die* die, int attribute) { return 0; } -static uint64_t MC_dwarf_attr_uint(Dwarf_Die* die, int attribute, uint64_t default_value) { +static uint64_t MC_dwarf_attr_integrate_uint(Dwarf_Die* die, int attribute, uint64_t default_value) { Dwarf_Attribute attr; if (dwarf_attr_integrate(die, attribute, &attr)==NULL) return default_value; @@ -294,7 +328,7 @@ static uint64_t MC_dwarf_attr_uint(Dwarf_Die* die, int attribute, uint64_t defau return dwarf_formudata(dwarf_attr_integrate(die, attribute, &attr), &value) == 0 ? (uint64_t) value : default_value; } -static bool MC_dwarf_attr_flag(Dwarf_Die* die, int attribute, int integrate) { +static bool MC_dwarf_attr_flag(Dwarf_Die* die, int attribute, bool integrate) { Dwarf_Attribute attr; if ((integrate ? dwarf_attr_integrate(die, attribute, &attr) : dwarf_attr(die, attribute, &attr))==0) @@ -307,6 +341,14 @@ static bool MC_dwarf_attr_flag(Dwarf_Die* die, int attribute, int integrate) { return result; } +/** \brief Find the default lower bound for a given language + * + * The default lower bound of an array (when DW_TAG_lower_bound + * is missing) depends on the language of the compilation unit. + * + * \param lang Language of the compilation unit (values defined in the DWARF spec) + * \return Default lower bound of an array in this compilation unit + * */ static uint64_t MC_dwarf_default_lower_bound(int lang) { switch(lang) { case DW_LANG_C: @@ -332,18 +374,24 @@ static uint64_t MC_dwarf_default_lower_bound(int lang) { case DW_LANG_Cobol85: return 1; default: - xbt_die("No default MT_TAG_lower_bound for language %i and none given", lang); + xbt_die("No default DW_TAG_lower_bound for language %i and none given", lang); return 0; } } +/** \brief Finds the number of elements in a DW_TAG_subrange_type or DW_TAG_enumeration_type DIE + * + * \param die the DIE + * \param unit DIE of the compilation unit + * \return number of elements in the range + * */ static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit) { xbt_assert(dwarf_tag(die)==DW_TAG_enumeration_type ||dwarf_tag(die)==DW_TAG_subrange_type, "MC_dwarf_subrange_element_count called with DIE of type %s", MC_dwarf_die_tagname(die)); // Use DW_TAG_count if present: if (dwarf_hasattr_integrate(die, DW_AT_count)) { - return MC_dwarf_attr_uint(die, DW_AT_count, 0); + return MC_dwarf_attr_integrate_uint(die, DW_AT_count, 0); } // Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound + 1: @@ -352,17 +400,26 @@ static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit) // This is not really 0, but the code expects this (we do not know): return 0; } - uint64_t upper_bound = MC_dwarf_attr_uint(die, DW_AT_upper_bound, -1); + uint64_t upper_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_upper_bound, -1); uint64_t lower_bound = 0; if (dwarf_hasattr_integrate(die, DW_AT_lower_bound)) { - lower_bound = MC_dwarf_attr_uint(die, DW_AT_lower_bound, -1); + lower_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_lower_bound, -1); } else { lower_bound = MC_dwarf_default_lower_bound(dwarf_srclang(unit)); } return upper_bound - lower_bound + 1; } +/** \brief Finds the number of elements in a array type (DW_TAG_array_type) + * + * The compilation unit might be needed because the default lower + * bound depends on the language of the compilation unit. + * + * \param die the DIE of the DW_TAG_array_type + * \param unit the DIE of the compilation unit + * \return number of elements in this array type + * */ static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit) { xbt_assert(dwarf_tag(die)==DW_TAG_array_type, "MC_dwarf_array_element_count called with DIE of type %s", MC_dwarf_die_tagname(die)); @@ -381,6 +438,13 @@ static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit) { // ***** dw_type_t +/** \brief Initialize the location of a member of a type + * (DW_AT_data_member_location of a DW_TAG_member). + * + * \param type a type (struct, class) + * \param member the member of the type + * \param child DIE of the member (DW_TAG_member) + */ static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwarf_Die* child) { if (dwarf_hasattr(child, DW_AT_data_bit_offset)) { xbt_die("Can't groke DW_AT_data_bit_offset."); @@ -410,7 +474,7 @@ static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwar if (dwarf_getlocation(&attr, &expr, &len)) { xbt_die( "Could not read location expression DW_AT_data_member_location in DW_TAG_member %s of type <%p>%s", - MC_dwarf_attr_string(child, DW_AT_name), + MC_dwarf_attr_integrate_string(child, DW_AT_name), type->id, type->name); } if (len==1 && expr[0].atom == DW_OP_plus_uconst) { @@ -428,7 +492,7 @@ static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwar member->offset = offset; else xbt_die("Cannot get %s location <%p>%s", - MC_dwarf_attr_string(child, DW_AT_name), + MC_dwarf_attr_integrate_string(child, DW_AT_name), type->id, type->name); break; } @@ -446,11 +510,22 @@ static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwar } +static void dw_type_free_voidp(void *t){ + dw_type_free((dw_type_t) * (void **) t); +} + +/** \brief Populate the list of members of a type + * + * \param info ELF object containing the type DIE + * \param die DIE of the type + * \param unit DIE of the compilation unit containing the type DIE + * \param type the type + */ static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_type_t type) { int res; Dwarf_Die child; xbt_assert(!type->members); - type->members = xbt_dynar_new(sizeof(dw_type_t), (void(*)(void*))dw_type_free); + type->members = xbt_dynar_new(sizeof(dw_type_t), (void(*)(void*))dw_type_free_voidp); for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) { int tag = dwarf_tag(&child); if (tag==DW_TAG_member || tag==DW_TAG_inheritance) { @@ -470,13 +545,13 @@ static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die* die, Dwarf_Di // Global Offset: member->id = (void *) dwarf_dieoffset(&child); - const char* name = MC_dwarf_attr_string(&child, DW_AT_name); + const char* name = MC_dwarf_attr_integrate_string(&child, DW_AT_name); if(name) member->name = xbt_strdup(name); else member->name = NULL; - member->byte_size = MC_dwarf_attr_uint(&child, DW_AT_byte_size, 0); + member->byte_size = MC_dwarf_attr_integrate_uint(&child, DW_AT_byte_size, 0); member->element_count = -1; member->dw_type_id = MC_dwarf_at_type(&child); member->members = NULL; @@ -538,7 +613,7 @@ static dw_type_t MC_dwarf_die_to_type(mc_object_info_t info, Dwarf_Die* die, Dwa prefix = ""; } - const char* name = MC_dwarf_attr_string(die, DW_AT_name); + const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name); if (name!=NULL) { type->name = namespace ? bprintf("%s%s::%s", prefix, namespace, name) : bprintf("%s%s", prefix, name); } @@ -549,7 +624,7 @@ static dw_type_t MC_dwarf_die_to_type(mc_object_info_t info, Dwarf_Die* die, Dwa // Computation of the byte_size; if (dwarf_hasattr_integrate(die, DW_AT_byte_size)) - type->byte_size = MC_dwarf_attr_uint(die, DW_AT_byte_size, 0); + type->byte_size = MC_dwarf_attr_integrate_uint(die, DW_AT_byte_size, 0); else if (type->type == DW_TAG_array_type || type->type==DW_TAG_structure_type || type->type==DW_TAG_class_type) { Dwarf_Word size; if (dwarf_aggregate_size(die, &size)==0) { @@ -588,6 +663,7 @@ static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die* die, Dwar char* key = bprintf("%" PRIx64, (uint64_t) type->id); xbt_dict_set(info->types, key, type, NULL); + xbt_free(key); if(type->name && type->byte_size!=0) { xbt_dict_set(info->full_types_by_name, type->name, type, NULL); @@ -614,8 +690,9 @@ static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, D dw_variable_t variable = xbt_new0(s_dw_variable_t, 1); variable->dwarf_offset = dwarf_dieoffset(die); variable->global = frame == NULL; // Can be override base on DW_AT_location + variable->object_info = info; - const char* name = MC_dwarf_attr_string(die, DW_AT_name); + const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name); variable->name = xbt_strdup(name); variable->type_origin = MC_dwarf_at_type(die); @@ -638,8 +715,7 @@ static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, D if (len==1 && expr[0].atom == DW_OP_addr) { variable->global = 1; Dwarf_Off offset = expr[0].number; - // TODO, Why is this different base on the object? - Dwarf_Off base = strcmp(info->file_name, xbt_binary_name) !=0 ? (Dwarf_Off) info->start_exec : 0; + Dwarf_Off base = (Dwarf_Off) MC_object_base_address(info); variable->address = (void*) (base + offset); } else { mc_dwarf_location_list_init_from_expression(&variable->locations, len, expr); @@ -698,37 +774,85 @@ static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, MC_dwarf_register_variable(info, frame, variable); } -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) { +static void mc_frame_free_voipd(dw_frame_t* p) { + mc_frame_free(*p); + *p = NULL; +} + +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) { + // TODO, handle DW_TAG_type/DW_TAG_location for DW_TAG_with_stmt + int tag = dwarf_tag(die); + mc_tag_class klass = MC_dwarf_tag_classify(tag); // (Template) Subprogram declaration: - if (MC_dwarf_attr_flag(die, DW_AT_declaration, false)) + if(klass==mc_tag_subprogram && MC_dwarf_attr_flag(die, DW_AT_declaration, false)) return; + if(klass==mc_tag_scope) + xbt_assert(parent_frame, "No parent scope for this scope"); + dw_frame_t frame = xbt_new0(s_dw_frame_t, 1); - frame->start = dwarf_dieoffset(die); + frame->tag = tag; + frame->id = dwarf_dieoffset(die); + frame->object_info = info; + + if(klass==mc_tag_subprogram) { + const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name); + frame->name = namespace ? bprintf("%s::%s", namespace, name) : xbt_strdup(name); + } - const char* name = MC_dwarf_attr_string(die, DW_AT_name); - frame->name = namespace ? bprintf("%s::%s", namespace, name) : xbt_strdup(name); + frame->abstract_origin_id = MC_dwarf_attr_dieoffset(die, DW_AT_abstract_origin); // This is the base address for DWARF addresses. // Relocated addresses are offset from this base address. // See DWARF4 spec 7.5 - void* base = info->flags & MC_OBJECT_INFO_EXECUTABLE ? 0 : MC_object_base_address(info); + void* base = MC_object_base_address(info); // Variables are filled in the (recursive) call of MC_dwarf_handle_children: frame->variables = xbt_dynar_new(sizeof(dw_variable_t), dw_variable_free_voidp); - frame->high_pc = ((char*) base) + MC_dwarf_attr_addr(die, DW_AT_high_pc); - frame->low_pc = ((char*) base) + MC_dwarf_attr_addr(die, DW_AT_low_pc); + frame->low_pc = ((char*) base) + MC_dwarf_attr_integrate_addr(die, DW_AT_low_pc); + + // DW_AT_high_pc: + { + Dwarf_Attribute attr; + if(dwarf_attr_integrate(die, DW_AT_high_pc, &attr)) { + uint64_t high_pc; + Dwarf_Addr value; + if (dwarf_formaddr(&attr, &value) == 0) + high_pc = (uint64_t) value; + else + high_pc = 0; + + int form = dwarf_whatform(&attr); + int klass = MC_dwarf_form_get_class(form); + if (klass == MC_DW_CLASS_CONSTANT) + frame->high_pc = (void*) ((Dwarf_Off)frame->low_pc + high_pc); + else if(klass == MC_DW_CLASS_ADDRESS) + frame->high_pc = ((char*) base) + high_pc; + else + xbt_die("Unexpected class for DW_AT_high_pc"); + } else { + frame->high_pc = 0; + } + } - Dwarf_Attribute attr_frame_base; - if (dwarf_attr_integrate(die, DW_AT_frame_base, &attr_frame_base)) - mc_dwarf_location_list_init(&frame->frame_base, info, die, &attr_frame_base); + if(klass==mc_tag_subprogram) { + Dwarf_Attribute attr_frame_base; + if (dwarf_attr_integrate(die, DW_AT_frame_base, &attr_frame_base)) + mc_dwarf_location_list_init(&frame->frame_base, info, die, &attr_frame_base); + } - frame->end = -1; // This one is now useless: + frame->scopes = xbt_dynar_new(sizeof(dw_frame_t), (void_f_pvoid_t) mc_frame_free_voipd); // Register it: - xbt_dynar_push(info->subprograms, &frame); + if(klass==mc_tag_subprogram) { + char* key = bprintf("%" PRIx64, (uint64_t) frame->id); + xbt_dict_set(info->subprograms, key, frame, NULL); + xbt_free(key); + } else if(klass==mc_tag_scope) { + xbt_dynar_push(parent_frame->scopes, &frame); + } // Handle children: MC_dwarf_handle_children(info, die, unit, frame, namespace); @@ -736,15 +860,17 @@ static void MC_dwarf_handle_subprogram_die(mc_object_info_t info, Dwarf_Die* die static void mc_dwarf_handle_namespace_die( mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) { - const char* name = MC_dwarf_attr_string(die, DW_AT_name); + const char* name = MC_dwarf_attr_integrate_string(die, DW_AT_name); if(frame) xbt_die("Unexpected namespace in a subprogram"); char* new_namespace = namespace == NULL ? xbt_strdup(name) : bprintf("%s::%s", namespace, name); MC_dwarf_handle_children(info, die, unit, frame, new_namespace); + xbt_free(new_namespace); } static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame, const char* namespace) { + // For each child DIE: Dwarf_Die child; int res; for (res=dwarf_child(die, &child); res==0; res=dwarf_siblingof(&child,&child)) { @@ -762,9 +888,10 @@ static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die MC_dwarf_handle_type_die(info, die, unit, frame, namespace); break; - // Program: + // Subprogram or scope: case mc_tag_subprogram: - MC_dwarf_handle_subprogram_die(info, die, unit, frame, namespace); + case mc_tag_scope: + MC_dwarf_handle_scope_die(info, die, unit, frame, namespace); return; // Variable: @@ -772,11 +899,6 @@ static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die MC_dwarf_handle_variable_die(info, die, unit, frame, namespace); break; - // Scope: - case mc_tag_scope: - // TODO - break; - case mc_tag_namespace: mc_dwarf_handle_namespace_die(info, die, unit, frame, namespace); break; @@ -787,6 +909,11 @@ static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die } } +/** \brief Populate the debugging informations of the given ELF object + * + * Read the DWARf information of the EFFL object and populate the + * lists of types, variables, functions. + */ void MC_dwarf_get_variables(mc_object_info_t info) { int fd = open(info->file_name, O_RDONLY); if (fd<0) { @@ -797,18 +924,21 @@ void MC_dwarf_get_variables(mc_object_info_t info) { xbt_die("Your program must be compiled with -g"); } + // For each compilation unit: Dwarf_Off offset = 0; Dwarf_Off next_offset = 0; size_t length; while (dwarf_nextcu (dwarf, offset, &next_offset, &length, NULL, NULL, NULL) == 0) { Dwarf_Die unit_die; - if(dwarf_offdie(dwarf, offset+length, &unit_die)!=NULL) { + + // For each child DIE: Dwarf_Die child; int res; for (res=dwarf_child(&unit_die, &child); res==0; res=dwarf_siblingof(&child,&child)) { MC_dwarf_handle_die(info, &child, &unit_die, NULL, NULL); } + } offset = next_offset; }