X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/c4a8bfda960025eefdba44939f63c4e2e615d554..7ef55d47978f2f2ef20bd27c85881faa99147034:/src/mc/mc_dwarf.c diff --git a/src/mc/mc_dwarf.c b/src/mc/mc_dwarf.c index f78723f68c..618ed29097 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 +117,57 @@ const char* MC_dwarf_tagname(int tag) { } } +#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 +#define MC_DW_CLASS_CONSTANT 3 +#define MC_DW_CLASS_STRING 3 // String +#define MC_DW_CLASS_FLAG 4 // Boolean +#define MC_DW_CLASS_REFERENCE 5 // Reference to another DIE +#define MC_DW_CLASS_EXPRLOC 6 // DWARF expression/location description +#define MC_DW_CLASS_LINEPTR 7 +#define MC_DW_CLASS_LOCLISTPTR 8 +#define MC_DW_CLASS_MACPTR 9 +#define MC_DW_CLASS_RANGELISTPTR 10 + +static int MC_dwarf_form_get_class(int form) { + switch(form) { + case DW_FORM_addr: + return MC_DW_CLASS_ADDRESS; + case DW_FORM_block2: + case DW_FORM_block4: + 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: + case DW_FORM_udata: + case DW_FORM_sdata: + return MC_DW_CLASS_CONSTANT; + case DW_FORM_string: + case DW_FORM_strp: + return MC_DW_CLASS_STRING; + case DW_FORM_ref_addr: + case DW_FORM_ref1: + case DW_FORM_ref2: + case DW_FORM_ref4: + case DW_FORM_ref8: + case DW_FORM_ref_udata: + return MC_DW_CLASS_REFERENCE; + case DW_FORM_flag: + case DW_FORM_flag_present: + return MC_DW_CLASS_FLAG; + case DW_FORM_exprloc: + return MC_DW_CLASS_EXPRLOC; + // TODO sec offset + // TODO indirect + default: + return MC_DW_CLASS_UNKNOWN; + } +} + /** \brief Get the name of the tag of a given DIE * * \param die DIE @@ -165,8 +215,7 @@ 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_libdw(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; @@ -187,8 +236,11 @@ static dw_location_t MC_dwarf_get_location_list_libdw(Dwarf_Die* die, Dwarf_Attr 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); @@ -196,6 +248,31 @@ static dw_location_t MC_dwarf_get_location_list_libdw(Dwarf_Die* die, Dwarf_Attr } } +/** \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. @@ -205,7 +282,7 @@ static dw_location_t MC_dwarf_get_location_list_libdw(Dwarf_Die* die, Dwarf_Attr * \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, mc_object_info_t info) { +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) { @@ -225,11 +302,12 @@ 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_libdw(die, attr); + return MC_dwarf_get_location_list(info, die, attr); } break; @@ -252,13 +330,13 @@ 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, mc_object_info_t info) { +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, info); + return MC_dwarf_get_location(info, die, &attr); } static char* MC_dwarf_at_type(Dwarf_Die* die) { @@ -346,7 +424,7 @@ 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): @@ -360,7 +438,7 @@ 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) { @@ -430,9 +508,12 @@ 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); - switch (dwarf_whatform(&attr)) { - - case DW_FORM_exprloc: + 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: + // Location expression: { Dwarf_Op* expr; size_t len; @@ -445,28 +526,34 @@ static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member, Dwar if (len==1 && expr[0].atom == DW_OP_plus_uconst) { member->offset = expr[0].number; } else { - xbt_die("Can't groke this location expression yet. %i %i", - len==1 , expr[0].atom == DW_OP_plus_uconst); + xbt_die("Can't groke this location expression yet."); } break; } - case DW_FORM_data1: - case DW_FORM_data2: - case DW_FORM_data4: - case DW_FORM_data8: - case DW_FORM_sdata: - case DW_FORM_udata: + case MC_DW_CLASS_CONSTANT: + // Offset from the base address of the object: { Dwarf_Word offset; if (!dwarf_formudata(&attr, &offset)) member->offset = offset; else - xbt_die("Cannot get DW_AT_data_member_%s location <%p>%s", + xbt_die("Cannot get %s location <%p>%s", MC_dwarf_attr_string(child, DW_AT_name), type->id, type->name); break; } + case MC_DW_CLASS_LOCLISTPTR: + // Reference to a location list: + // TODO + case MC_DW_CLASS_REFERENCE: + // 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 (%i) / form 0x%x as DW_AT_member_location", + klass, form); } + } static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit, dw_type_t type) { @@ -579,6 +666,10 @@ 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) */ @@ -740,6 +831,8 @@ 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)) @@ -756,12 +849,13 @@ 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 form; - switch (form = dwarf_whatform(&attr_location)) { - case DW_FORM_exprloc: - case DW_FORM_block1: // Not in the spec but found in the wild. + int form = dwarf_whatform(&attr_location); + int klass = form == DW_FORM_sec_offset ? MC_DW_CLASS_CONSTANT : MC_dwarf_form_get_class(form); + switch (klass) { + case MC_DW_CLASS_EXPRLOC: + case MC_DW_CLASS_BLOCK: + // Location expression: { Dwarf_Op* expr; size_t len; @@ -775,21 +869,28 @@ 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; } - case DW_FORM_sec_offset: // type loclistptr - case DW_FORM_data4: - xbt_die("Do not handle loclist locations yet"); + case MC_DW_CLASS_LOCLISTPTR: + case MC_DW_CLASS_CONSTANT: + // Reference to location list: + variable->location = MC_dwarf_get_location_list(info, die, &attr_location); break; default: - xbt_die("Unexpected form %i list for location in <%p>%s", - form, (void*) variable->dwarf_offset, variable->name); + xbt_die("Unexpected form 0x%x (%i), class 0x%x (%i) list for location in <%p>%s", + form, form, 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; @@ -812,11 +913,16 @@ static void MC_dwarf_handle_subprogram_die(mc_object_info_t info, Dwarf_Die* die 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, info); + 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: @@ -861,12 +967,12 @@ static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die case DW_TAG_shared_type: MC_dwarf_handle_type_die(info, die, unit); break; - case DW_TAG_inlined_subroutine: case DW_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: MC_dwarf_handle_variable_die(info, die, unit, frame); break; } @@ -890,6 +996,7 @@ void MC_dwarf_get_variables(mc_object_info_t info) { 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); }