return MC_dwarf_tagname(dwarf_tag(die));
}
-static int MC_dwarf_tag_type(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:
- case DW_TAG_rvalue_reference_type:
- return 1;
- default:
- return 0;
- }
-}
+// ***** Attributes
static const char* MC_dwarf_attr_string(Dwarf_Die* die, int attribute) {
Dwarf_Attribute attr;
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) {
+ Dwarf_Attribute attr;
+ if ((integrate ? dwarf_attr_integrate(die, attribute, &attr)
+ : dwarf_attr(die, attribute, &attr))==0)
+ return false;
+
+ bool result;
+ if (dwarf_formflag(&attr, &result))
+ xbt_die("Unexpected form for attribute %s",
+ MC_dwarf_attrname(attribute));
+ return result;
+}
+
static uint64_t MC_dwarf_default_lower_bound(int lang) {
switch(lang) {
case DW_LANG_C:
return result;
}
+// ***** Location
+
+Dwarf_Off MC_dwarf_resolve_location(unw_cursor_t* c, dw_location_t location, void* frame_pointer_address) {
+ unw_word_t res;
+ switch (location->type){
+ case e_dw_compose:
+ if (xbt_dynar_length(location->location.compose) > 1){
+ return 0; /* TODO : location list with optimizations enabled */
+ }
+ dw_location_t location_entry = xbt_dynar_get_as(location->location.compose, 0, dw_location_t);
+ switch (location_entry->type){
+ case e_dw_register:
+ unw_get_reg(c, location_entry->location.reg, &res);
+ return res;
+ case e_dw_bregister_op:
+ unw_get_reg(c, location_entry->location.breg_op.reg, &res);
+ return (Dwarf_Off) ((long)res + location_entry->location.breg_op.offset);
+ break;
+ case e_dw_fbregister_op:
+ if (frame_pointer_address != NULL)
+ return (Dwarf_Off)((char *)frame_pointer_address + location_entry->location.fbreg_op);
+ else
+ return 0;
+ default:
+ return 0; /* FIXME : implement other cases (with optimizations enabled) */
+ }
+ break;
+ default:
+ return 0;
+ }
+}
+
+// ***** dw_type_t
+
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.");
case DW_FORM_exprloc:
{
- //TODO, location can be an integer as well
Dwarf_Op* expr;
size_t len;
if (dwarf_getlocation(&attr, &expr, &len)) {
xbt_dict_set(info->types, key, type, NULL);
}
+/** \brief Convert libdw location expresion elment into native one (or NULL in some cases) */
+static dw_location_t MC_dwarf_get_expression_element(Dwarf_Op* op) {
+ dw_location_t element = xbt_new0(s_dw_location_t, 1);
+ uint8_t atom = op->atom;
+ if (atom >= DW_OP_reg0 && atom<= DW_OP_reg31) {
+ element->type = e_dw_register;
+ element->location.reg = atom - DW_OP_reg0;
+ }
+ else if (atom >= DW_OP_breg0 && atom<= DW_OP_breg31) {
+ element->type = e_dw_bregister_op;
+ element->location.reg = atom - DW_OP_breg0;
+ element->location.breg_op.offset = op->number;
+ }
+ else if (atom >= DW_OP_lit0 && atom<= DW_OP_lit31) {
+ element->type = e_dw_lit;
+ element->location.reg = atom - DW_OP_lit0;
+ }
+ else switch (atom) {
+ case DW_OP_fbreg:
+ element->type = e_dw_fbregister_op;
+ element->location.fbreg_op = op->number;
+ break;
+ case DW_OP_piece:
+ element->type = e_dw_piece;
+ element->location.piece = op->number;
+ break;
+ case DW_OP_plus_uconst:
+ element->type = e_dw_plus_uconst;
+ element->location.plus_uconst = op->number;
+ break;
+ case DW_OP_abs:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("abs");
+ break;
+ case DW_OP_and:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("and");
+ break;
+ case DW_OP_div:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("div");
+ break;
+ case DW_OP_minus:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("minus");
+ break;
+ case DW_OP_mod:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("mod");
+ break;
+ case DW_OP_mul:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("mul");
+ break;
+ case DW_OP_neg:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("neg");
+ break;
+ case DW_OP_not:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("not");
+ break;
+ case DW_OP_or:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("or");
+ break;
+ case DW_OP_plus:
+ element->type = e_dw_arithmetic;
+ element->location.arithmetic = xbt_strdup("plus");
+ break;
+
+ case DW_OP_stack_value:
+ // Why nothing here?
+ xbt_free(element);
+ return NULL;
+
+ case DW_OP_deref_size:
+ element->type = e_dw_deref;
+ element->location.deref_size = (unsigned int short) op->number;
+ break;
+ case DW_OP_deref:
+ element->type = e_dw_deref;
+ element->location.deref_size = sizeof(void *);
+ break;
+ case DW_OP_constu:
+ element->type = e_dw_uconstant;
+ element->location.uconstant.bytes = 1;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_consts:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 1;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+
+ case DW_OP_const1u:
+ element->type = e_dw_uconstant;
+ element->location.uconstant.bytes = 1;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const2u:
+ element->type = e_dw_uconstant;
+ element->location.uconstant.bytes = 2;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const4u:
+ element->type = e_dw_uconstant;
+ element->location.uconstant.bytes = 4;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const8u:
+ element->type = e_dw_uconstant;
+ element->location.uconstant.bytes = 8;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+
+ case DW_OP_const1s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 1;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const2s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 2;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const4s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 4;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ case DW_OP_const8s:
+ element->type = e_dw_sconstant;
+ element->location.uconstant.bytes = 8;
+ element->location.uconstant.value = (unsigned long int) op->number;
+ break;
+ default:
+ element->type = e_dw_unsupported;
+ break;
+ }
+ return element;
+}
+
+/** \brief Convert libdw location expresion into native one */
+static dw_location_t MC_dwarf_get_expression(Dwarf_Op* expr, size_t len) {
+ dw_location_t loc = xbt_new0(s_dw_location_t, 1);
+ loc->type = e_dw_compose;
+ loc->location.compose = xbt_dynar_new(sizeof(dw_location_t), NULL);
+
+ int i;
+ for (i=0; i!=len; ++i) {
+ dw_location_t element = MC_dwarf_get_expression_element(expr+i);
+ if (element)
+ xbt_dynar_push(loc->location.compose, &element);
+ }
+
+ return loc;
+}
+
+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))
+ return NULL;
+
+ Dwarf_Attribute attr_location;
+ if (dwarf_attr(die, DW_AT_location, &attr_location)==NULL) {
+ // No location: do not add it ?
+ return NULL;
+ }
+
+ 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->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.
+ {
+ Dwarf_Op* expr;
+ size_t len;
+ if (dwarf_getlocation(&attr_location, &expr, &len)) {
+ xbt_die(
+ "Could not read location expression in DW_AT_location of variable <%p>%s",
+ (void*) variable->dwarf_offset, variable->name);
+ }
+
+ 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_text : 0;
+ variable->address.address = (void*) (base + offset);
+ } else {
+ variable->address.location = MC_dwarf_get_expression(expr, len);
+ }
+
+ break;
+ }
+ case DW_FORM_sec_offset: // type loclistptr
+ xbt_die("Do not handle loclist locations yet");
+ break;
+ default:
+ xbt_die("Unexpected form %i list for location in <%p>%s",
+ form, (void*) variable->dwarf_offset, variable->name);
+ }
+
+ return variable;
+}
+
+static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit) {
+ dw_variable_t variable = MC_die_to_variable(info, die, unit, NULL);
+ if(variable==NULL)
+ return;
+ if(variable->global)
+ MC_dwarf_register_global_variable(info, variable);
+ else
+ xbt_die("Unexpected non global variable <%p>%s",
+ (void*) dwarf_dieoffset(die),
+ MC_dwarf_attr_string(die, DW_AT_name)
+ );
+}
+
static void MC_dwarf_handle_children(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit) {
Dwarf_Die child;
}
static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die* die, Dwarf_Die* unit) {
- int tag = dwarf_tag(die);
-
- // Register types:
- if (MC_dwarf_tag_type(tag))
- MC_dwarf_handle_type_die(info, die, unit);
-
- // Other tag-specific handling:
- else switch(tag) {
+ 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_dwarf_handle_type_die(info, die, unit);
+ break;
+ case DW_TAG_inlined_subroutine:
+ case DW_TAG_subprogram:
+ // Skip recursive processing
+ return;
+ case DW_TAG_variable:
+ if (MC_USE_LIBDW_NON_FUNCTION_VARIABLES)
+ MC_dwarf_handle_variable_die(info, die, unit);
+ break;
+ }
- // Recursive processing od children DIE:
- MC_dwarf_handle_children(info, die, unit);
+ // Recursive processing of children DIE:
+ MC_dwarf_handle_children(info, die, unit);
}
void MC_dwarf_get_variables_libdw(mc_object_info_t info) {
