/* 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. */
* \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;
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);
}
}
+/** \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.
* \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) {
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;
* \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) {
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) */
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))
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) {
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 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;
}
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:
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;
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) {
+
+ // Skip C++ for now (we will add support for it soon):
+ int lang = dwarf_srclang(&die);
+ if((lang==DW_LANG_C_plus_plus) || (lang==DW_LANG_ObjC_plus_plus)) {
+ offset = next_offset;
+ continue;
+ }
+
MC_dwarf_handle_die(info, &die, &die, NULL);
}
offset = next_offset;
