X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/68e8eda949e1e2a5463a5044dfc96a290d332c0e..f3971a8d8941bced71760fe7f298a79c234ed6d2:/src/mc/mc_dwarf.c diff --git a/src/mc/mc_dwarf.c b/src/mc/mc_dwarf.c index c95f51ebcf..94f05130ba 100644 --- a/src/mc/mc_dwarf.c +++ b/src/mc/mc_dwarf.c @@ -1,6 +1,5 @@ /* Copyright (c) 2008-2013. The SimGrid Team. * All rights reserved. */ - /* This program is free software; you can redistribute it and/or modify it * under the terms of the license (GNU LGPL) which comes with this package. */ @@ -118,6 +117,61 @@ const char* MC_dwarf_tagname(int tag) { } } +/** \brief A class of DWARF tags (DW_TAG_*) + */ +typedef enum mc_tag_class { + mc_tag_unkonwn, + mc_tag_type, + mc_tag_subprogram, + mc_tag_variable, + mc_tag_scope +} mc_tag_class; + +static mc_tag_class MC_dwarg_tag_classify(int tag) { + switch (tag) { + + case DW_TAG_array_type: + case DW_TAG_class_type: + case DW_TAG_enumeration_type: + case DW_TAG_typedef: + case DW_TAG_pointer_type: + case DW_TAG_string_type: + case DW_TAG_structure_type: + case DW_TAG_subroutine_type: + case DW_TAG_union_type: + case DW_TAG_ptr_to_member_type: + case DW_TAG_set_type: + case DW_TAG_subrange_type: + case DW_TAG_base_type: + case DW_TAG_const_type: + case DW_TAG_file_type: + case DW_TAG_packed_type: + case DW_TAG_volatile_type: + case DW_TAG_restrict_type: + case DW_TAG_interface_type: + case DW_TAG_unspecified_type: + case DW_TAG_mutable_type: + case DW_TAG_shared_type: + return mc_tag_type; + + case DW_TAG_subprogram: + return mc_tag_subprogram; + + case DW_TAG_variable: + case DW_TAG_formal_parameter: + return mc_tag_variable; + + case DW_TAG_lexical_block: + case DW_TAG_try_block: + case DW_TAG_inlined_subroutine: + return mc_tag_scope; + + default: + return mc_tag_unkonwn; + + } +} + #define MC_DW_CLASS_UNKNOWN 0 #define MC_DW_CLASS_ADDRESS 1 // Location in the address space of the program #define MC_DW_CLASS_BLOCK 2 // Arbitrary block of bytes @@ -140,6 +194,7 @@ static int MC_dwarf_form_get_class(int form) { case DW_FORM_block: case DW_FORM_block1: return MC_DW_CLASS_BLOCK; + case DW_FORM_data1: case DW_FORM_data2: case DW_FORM_data4: case DW_FORM_data8: @@ -215,7 +270,7 @@ static const char* MC_dwarf_at_linkage_name(Dwarf_Die* die) { * \return MC specific representation of the location list represented by the given attribute * of the given die */ -static dw_location_t MC_dwarf_get_location_list(Dwarf_Die* die, Dwarf_Attribute* attr) { +static dw_location_t MC_dwarf_get_location_list(mc_object_info_t info, Dwarf_Die* die, Dwarf_Attribute* attr) { dw_location_t location = xbt_new0(s_dw_location_t, 1); location->type = e_dw_loclist; @@ -236,8 +291,11 @@ static dw_location_t MC_dwarf_get_location_list(Dwarf_Die* die, Dwarf_Attribute* xbt_die("Error while loading location list"); dw_location_entry_t new_entry = xbt_new0(s_dw_location_entry_t, 1); - new_entry->lowpc = start; - new_entry->highpc = end; + + void* base = info->flags & MC_OBJECT_INFO_EXECUTABLE ? 0 : MC_object_base_address(info); + + new_entry->lowpc = (char*) base + start; + new_entry->highpc = (char*) base + end; new_entry->location = MC_dwarf_get_expression(expr, len); xbt_dynar_push(loclist, &new_entry); @@ -245,6 +303,31 @@ static dw_location_t MC_dwarf_get_location_list(Dwarf_Die* die, Dwarf_Attribute* } } +/** \brief Find the frame base of a given frame + * + * \param ip Instruction pointer + * \param frame + * \param unw_cursor + */ +void* mc_find_frame_base(void* ip, dw_frame_t frame, unw_cursor_t* unw_cursor) { + switch(frame->frame_base->type) { + case e_dw_loclist: + { + int loclist_cursor; + for(loclist_cursor=0; loclist_cursor < xbt_dynar_length(frame->frame_base->location.loclist); loclist_cursor++){ + dw_location_entry_t entry = xbt_dynar_get_as(frame->frame_base->location.loclist, loclist_cursor, dw_location_entry_t); + if((ip >= entry->lowpc) && (ip < entry->highpc)){ + return (void*) MC_dwarf_resolve_location(unw_cursor, entry->location, NULL); + } + } + return NULL; + } + // Not handled: + default: + return NULL; + } +} + /** \brief Get the location expression or location list from an attribute * * Processes direct expressions as well as location lists. @@ -254,7 +337,7 @@ static dw_location_t MC_dwarf_get_location_list(Dwarf_Die* die, Dwarf_Attribute* * \return MC specific representation of the location represented by the given attribute * of the given die */ -static dw_location_t MC_dwarf_get_location(Dwarf_Die* die, Dwarf_Attribute* attr) { +static dw_location_t MC_dwarf_get_location(mc_object_info_t info, Dwarf_Die* die, Dwarf_Attribute* attr) { int form = dwarf_whatform(attr); switch (form) { @@ -274,11 +357,12 @@ static dw_location_t MC_dwarf_get_location(Dwarf_Die* die, Dwarf_Attribute* attr // The attribute is a reference to a location list entry: case DW_FORM_sec_offset: + case DW_FORM_data1: case DW_FORM_data2: case DW_FORM_data4: case DW_FORM_data8: { - return MC_dwarf_get_location_list(die, attr); + return MC_dwarf_get_location_list(info, die, attr); } break; @@ -301,13 +385,13 @@ static dw_location_t MC_dwarf_get_location(Dwarf_Die* die, Dwarf_Attribute* attr * \return MC specific representation of the location represented by the given attribute * of the given die */ -static dw_location_t MC_dwarf_at_location(Dwarf_Die* die, int attribute) { +static dw_location_t MC_dwarf_at_location(mc_object_info_t info, Dwarf_Die* die, int attribute) { if(!dwarf_hasattr_integrate(die, attribute)) return xbt_new0(s_dw_location_t, 1); Dwarf_Attribute attr; dwarf_attr_integrate(die, attribute, &attr); - return MC_dwarf_get_location(die, &attr); + return MC_dwarf_get_location(info, die, &attr); } static char* MC_dwarf_at_type(Dwarf_Die* die) { @@ -395,7 +479,7 @@ static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit) return MC_dwarf_attr_uint(die, DW_AT_count, 0); } - // Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound: + // Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound + 1: if (!dwarf_hasattr_integrate(die, DW_AT_upper_bound)) { // This is not really 0, but the code expects this (we do not know): @@ -409,7 +493,7 @@ static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit) } else { lower_bound = MC_dwarf_default_lower_bound(dwarf_srclang(unit)); } - return upper_bound - lower_bound; + return upper_bound - lower_bound + 1; } static uint64_t MC_dwarf_array_element_count(Dwarf_Die* die, Dwarf_Die* unit) { @@ -479,7 +563,8 @@ static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwar Dwarf_Attribute attr; dwarf_attr_integrate(child, DW_AT_data_member_location, &attr); - int klass = MC_dwarf_form_get_class(dwarf_whatform(&attr)); + int form = dwarf_whatform(&attr); + int klass = MC_dwarf_form_get_class(form); switch (klass) { case MC_DW_CLASS_EXPRLOC: case MC_DW_CLASS_BLOCK: @@ -519,7 +604,9 @@ static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwar // It's supposed to be possible in DWARF2 but I couldn't find its semantic // in the spec. default: - xbt_die("Can't handle form class 0x%x (%i) as DW_AT_member_location", klass, klass); + xbt_die( + "Can't handle form class (%i) / form 0x%x as DW_AT_member_location", + klass, form); } } @@ -634,6 +721,10 @@ 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); + + if(type->name && type->byte_size!=0) { + xbt_dict_set(info->types_by_name, type->name, type, NULL); + } } /** \brief Convert libdw location expresion elment into native one (or NULL in some cases) */ @@ -795,6 +886,8 @@ static dw_location_t MC_dwarf_get_expression(Dwarf_Op* expr, size_t len) { return loc; } +static int mc_anonymous_variable_index = 0; + static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) { // Drop declaration: if (MC_dwarf_attr_flag(die, DW_AT_declaration, false)) @@ -811,7 +904,6 @@ static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, D variable->global = frame == NULL; // Can be override base on DW_AT_location variable->name = xbt_strdup(MC_dwarf_attr_string(die, DW_AT_name)); variable->type_origin = MC_dwarf_at_type(die); - variable->address.address = NULL; int klass = MC_dwarf_form_get_class(dwarf_whatform(&attr_location)); switch (klass) { @@ -831,10 +923,10 @@ static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, D 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_text : 0; - variable->address.address = (void*) (base + offset); + Dwarf_Off base = strcmp(info->file_name, xbt_binary_name) !=0 ? (Dwarf_Off) info->start_exec : 0; + variable->address = (void*) (base + offset); } else { - variable->address.location = MC_dwarf_get_expression(expr, len); + variable->location = MC_dwarf_get_expression(expr, len); } break; @@ -842,13 +934,19 @@ static dw_variable_t MC_die_to_variable(mc_object_info_t info, Dwarf_Die* die, D case MC_DW_CLASS_LOCLISTPTR: case MC_DW_CLASS_CONSTANT: // Reference to location list: - variable->address.location = MC_dwarf_get_location_list(die, &attr_location); + variable->location = MC_dwarf_get_location_list(info, die, &attr_location); break; default: xbt_die("Unexpected calss 0x%x (%i) list for location in <%p>%s", klass, klass, (void*) variable->dwarf_offset, variable->name); } + // The current code needs a variable name, + // generate a fake one: + if(!variable->name) { + variable->name = bprintf("@anonymous#%i", mc_anonymous_variable_index++); + } + return variable; } @@ -864,23 +962,26 @@ static void MC_dwarf_handle_subprogram_die(mc_object_info_t info, Dwarf_Die* die frame->start = dwarf_dieoffset(die); - const char* name = MC_dwarf_at_linkage_name(die); - if (name==NULL) - name = MC_dwarf_attr_string(die, DW_AT_name); + const char* name = MC_dwarf_attr_string(die, DW_AT_name); frame->name = xbt_strdup(name); + // 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); + // 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 = (void*) MC_dwarf_attr_addr(die, DW_AT_high_pc); - frame->low_pc = (void*) MC_dwarf_attr_addr(die, DW_AT_low_pc); - frame->frame_base = MC_dwarf_at_location(die, DW_AT_frame_base); + 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->frame_base = MC_dwarf_at_location(info, die, DW_AT_frame_base); frame->end = -1; // This one is now useless: // Handle children: MC_dwarf_handle_children(info, die, unit, frame); // Register it: - xbt_dict_set(info->local_variables, frame->name, frame, NULL); + xbt_dynar_push(info->subprograms, &frame); } static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) { @@ -893,44 +994,33 @@ static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwar static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_frame_t frame) { int tag = dwarf_tag(die); - switch (tag) { - case DW_TAG_array_type: - case DW_TAG_class_type: - case DW_TAG_enumeration_type: - case DW_TAG_typedef: - case DW_TAG_pointer_type: - case DW_TAG_string_type: - case DW_TAG_structure_type: - case DW_TAG_subroutine_type: - case DW_TAG_union_type: - case DW_TAG_ptr_to_member_type: - case DW_TAG_set_type: - case DW_TAG_subrange_type: - case DW_TAG_base_type: - case DW_TAG_const_type: - case DW_TAG_file_type: - case DW_TAG_packed_type: - case DW_TAG_volatile_type: - case DW_TAG_restrict_type: - case DW_TAG_interface_type: - case DW_TAG_unspecified_type: - case DW_TAG_mutable_type: - case DW_TAG_shared_type: + mc_tag_class klass = MC_dwarg_tag_classify(tag); + switch (klass) { + + // Type: + case mc_tag_type: MC_dwarf_handle_type_die(info, die, unit); break; - case DW_TAG_inlined_subroutine: - case DW_TAG_subprogram: + + // Program: + case mc_tag_subprogram: MC_dwarf_handle_subprogram_die(info, die, unit, frame); return; - // case DW_TAG_formal_parameter: - case DW_TAG_variable: - case DW_TAG_formal_parameter: + + // Variable: + case mc_tag_variable: MC_dwarf_handle_variable_die(info, die, unit, frame); break; - } - // Recursive processing of children DIE: - MC_dwarf_handle_children(info, die, unit, frame); + // Scope: + case mc_tag_scope: + // TODO + break; + + default: + break; + + } } void MC_dwarf_get_variables(mc_object_info_t info) { @@ -947,9 +1037,14 @@ void MC_dwarf_get_variables(mc_object_info_t info) { Dwarf_Off next_offset = 0; size_t length; while (dwarf_nextcu (dwarf, offset, &next_offset, &length, NULL, NULL, NULL) == 0) { - Dwarf_Die die; - if(dwarf_offdie(dwarf, offset+length, &die)!=NULL) { - MC_dwarf_handle_die(info, &die, &die, NULL); + Dwarf_Die unit_die; + + if(dwarf_offdie(dwarf, offset+length, &unit_die)!=NULL) { + 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); + } } offset = next_offset; }