/* 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. */
}
}
+/** \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
+#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
* \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) {
// 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;
* \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) {
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):
} 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) {
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;
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) {
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 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 klass = MC_dwarf_form_get_class(dwarf_whatform(&attr_location));
+ switch (klass) {
+ case MC_DW_CLASS_EXPRLOC:
+ case MC_DW_CLASS_BLOCK:
+ // Location expression:
{
Dwarf_Op* expr;
size_t len;
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 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;
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) {
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:
+
+ // 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) {
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;
}
