-/* Copyright (c) 2008-2014. The SimGrid Team.
+/* Copyright (c) 2008-2015. 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. */
#include <cinttypes>
+#include <cstdint>
-#include <stdlib.h>
+#include <algorithm>
+#include <memory>
+#include <utility>
+
+#include <fcntl.h>
+#include <cstdlib>
#define DW_LANG_Objc DW_LANG_ObjC /* fix spelling error in older dwarf.h */
#include <dwarf.h>
#include <elfutils/libdw.h>
#include <simgrid_config.h>
+#include "src/simgrid/util.hpp"
#include <xbt/log.h>
#include <xbt/sysdep.h>
-#include "mc_object_info.h"
-#include "mc_private.h"
+#include "src/mc/mc_private.h"
+#include "src/mc/mc_dwarf.hpp"
-static void MC_dwarf_register_global_variable(mc_object_info_t info, dw_variable_t variable);
-static void MC_register_variable(mc_object_info_t info, dw_frame_t frame, dw_variable_t variable);
-static void MC_dwarf_register_non_global_variable(mc_object_info_t info, dw_frame_t frame, dw_variable_t variable);
-static void MC_dwarf_register_variable(mc_object_info_t info, dw_frame_t frame, dw_variable_t variable);
+#include "src/mc/Process.hpp"
+#include "src/mc/ObjectInformation.hpp"
+#include "src/mc/Variable.hpp"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_dwarf, mc, "DWARF processing");
* \param unit the DIE of the compile unit of the current DIE
* \param frame containg frame if any
*/
-static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die * die,
- Dwarf_Die * unit, dw_frame_t frame,
+static void MC_dwarf_handle_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Frame* frame,
const char *ns);
/** \brief Process a type DIE
*/
-static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die * die,
- Dwarf_Die * unit, dw_frame_t frame,
+static void MC_dwarf_handle_type_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Frame* frame,
const char *ns);
/** \brief Calls MC_dwarf_handle_die on all childrend of the given die
* \param unit the DIE of the compile unit of the current DIE
* \param frame containg frame if any
*/
-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_children(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Frame* frame,
const char *ns);
/** \brief Handle a variable (DW_TAG_variable or other)
* \param unit the DIE of the compile unit of the current DIE
* \param frame containg frame if any
*/
-static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die * die,
- Dwarf_Die * unit, dw_frame_t frame,
+static void MC_dwarf_handle_variable_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Frame* frame,
const char *ns);
/** \brief Get the DW_TAG_type of the DIE
*
* \param die DIE
- * \return DW_TAG_type attribute as a new string (NULL if none)
+ * \return DW_TAG_type attribute as a new string (nullptr if none)
*/
-static char *MC_dwarf_at_type(Dwarf_Die * die);
+static std::uint64_t MC_dwarf_at_type(Dwarf_Die * die);
-/** \brief A class of DWARF tags (DW_TAG_*)
- */
-typedef enum mc_tag_class {
- mc_tag_unknown,
- mc_tag_type,
- mc_tag_subprogram,
- mc_tag_variable,
- mc_tag_scope,
- mc_tag_namespace
-} mc_tag_class;
-
-static mc_tag_class MC_dwarf_tag_classify(int tag)
+namespace simgrid {
+namespace dwarf {
+
+enum class TagClass {
+ Unknown,
+ Type,
+ Subprogram,
+ Variable,
+ Scope,
+ Namespace
+};
+
+/*** Class of forms defined in the DWARF standard */
+enum class FormClass {
+ Unknown,
+ Address, // Location in the program's address space
+ Block, // Arbitrary block of bytes
+ Constant,
+ String,
+ Flag, // Boolean value
+ Reference, // Reference to another DIE
+ ExprLoc, // DWARF expression/location description
+ LinePtr,
+ LocListPtr,
+ MacPtr,
+ RangeListPtr
+};
+
+static
+TagClass classify_tag(int tag)
{
switch (tag) {
case DW_TAG_interface_type:
case DW_TAG_unspecified_type:
case DW_TAG_shared_type:
- return mc_tag_type;
+ return TagClass::Type;
case DW_TAG_subprogram:
- return mc_tag_subprogram;
+ return TagClass::Subprogram;
case DW_TAG_variable:
case DW_TAG_formal_parameter:
- return mc_tag_variable;
+ return TagClass::Variable;
case DW_TAG_lexical_block:
case DW_TAG_try_block:
case DW_TAG_catch_block:
case DW_TAG_inlined_subroutine:
case DW_TAG_with_stmt:
- return mc_tag_scope;
+ return TagClass::Scope;
case DW_TAG_namespace:
- return mc_tag_namespace;
+ return TagClass::Namespace;
default:
- return mc_tag_unknown;
-
+ return TagClass::Unknown;
}
}
-#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
-
/** \brief Find the DWARF data class for a given DWARF data form
*
* This mapping is defined in the DWARF spec.
* \param form The form (values taken from the DWARF spec)
* \return An internal representation for the corresponding class
* */
-static int MC_dwarf_form_get_class(int form)
+static
+FormClass classify_form(int form)
{
switch (form) {
case DW_FORM_addr:
- return MC_DW_CLASS_ADDRESS;
+ return FormClass::Address;
case DW_FORM_block2:
case DW_FORM_block4:
case DW_FORM_block:
case DW_FORM_block1:
- return MC_DW_CLASS_BLOCK;
+ return FormClass::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;
+ return FormClass::Constant;
case DW_FORM_string:
case DW_FORM_strp:
- return MC_DW_CLASS_STRING;
+ return FormClass::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;
+ return FormClass::Reference;
case DW_FORM_flag:
case DW_FORM_flag_present:
- return MC_DW_CLASS_FLAG;
+ return FormClass::Flag;
case DW_FORM_exprloc:
- return MC_DW_CLASS_EXPRLOC;
+ return FormClass::ExprLoc;
// TODO sec offset
// TODO indirect
default:
- return MC_DW_CLASS_UNKNOWN;
+ return FormClass::Unknown;
}
}
* \param die DIE
* \return name of the tag of this DIE
*/
-static inline const char *MC_dwarf_die_tagname(Dwarf_Die * die)
+inline XBT_PRIVATE
+const char *tagname(Dwarf_Die * die)
{
- return MC_dwarf_tagname(dwarf_tag(die));
+ return simgrid::dwarf::tagname(dwarf_tag(die));
+}
+
+}
}
// ***** Attributes
int attribute)
{
Dwarf_Attribute attr;
- if (!dwarf_attr_integrate(die, attribute, &attr)) {
- return NULL;
- } else {
+ if (!dwarf_attr_integrate(die, attribute, &attr))
+ return nullptr;
+ else
return dwarf_formstring(&attr);
- }
}
/** \brief Get the linkage name of a DIE.
* DW_AT_MIPS_linkage_name is used (at least by GCC).
*
* \param the DIE
- * \return linkage name of the given DIE (or NULL)
+ * \return linkage name of the given DIE (or nullptr)
* */
static const char *MC_dwarf_at_linkage_name(Dwarf_Die * die)
{
static Dwarf_Off MC_dwarf_attr_dieoffset(Dwarf_Die * die, int attribute)
{
Dwarf_Attribute attr;
- if (dwarf_hasattr_integrate(die, attribute)) {
- dwarf_attr_integrate(die, attribute, &attr);
- Dwarf_Die subtype_die;
- if (dwarf_formref_die(&attr, &subtype_die) == NULL) {
- xbt_die("Could not find DIE");
- }
- return dwarf_dieoffset(&subtype_die);
- } else
+ if (dwarf_hasattr_integrate(die, attribute) == 0)
return 0;
+ dwarf_attr_integrate(die, attribute, &attr);
+ Dwarf_Die subtype_die;
+ if (dwarf_formref_die(&attr, &subtype_die) == nullptr)
+ xbt_die("Could not find DIE");
+ return dwarf_dieoffset(&subtype_die);
}
static Dwarf_Off MC_dwarf_attr_integrate_dieoffset(Dwarf_Die * die,
int attribute)
{
Dwarf_Attribute attr;
- if (dwarf_hasattr_integrate(die, attribute)) {
- dwarf_attr_integrate(die, DW_AT_type, &attr);
- Dwarf_Die subtype_die;
- if (dwarf_formref_die(&attr, &subtype_die) == NULL) {
- xbt_die("Could not find DIE");
- }
- return dwarf_dieoffset(&subtype_die);
- } else
+ if (dwarf_hasattr_integrate(die, attribute) == 0)
return 0;
+ dwarf_attr_integrate(die, DW_AT_type, &attr);
+ Dwarf_Die subtype_die;
+ if (dwarf_formref_die(&attr, &subtype_die) == nullptr)
+ xbt_die("Could not find DIE");
+ return dwarf_dieoffset(&subtype_die);
}
/** \brief Find the type/subtype (DW_AT_type) for a DIE
*
* \param dit the DIE
- * \return DW_AT_type reference as a global offset in hexadecimal (or NULL)
+ * \return DW_AT_type reference as a global offset in hexadecimal (or nullptr)
*/
-static char *MC_dwarf_at_type(Dwarf_Die * die)
+static
+std::uint64_t MC_dwarf_at_type(Dwarf_Die * die)
{
- Dwarf_Off offset = MC_dwarf_attr_integrate_dieoffset(die, DW_AT_type);
- return offset == 0 ? NULL : bprintf("%" PRIx64, offset);
+ return MC_dwarf_attr_integrate_dieoffset(die, DW_AT_type);
}
static uint64_t MC_dwarf_attr_integrate_addr(Dwarf_Die * die, int attribute)
{
Dwarf_Attribute attr;
- if (dwarf_attr_integrate(die, attribute, &attr) == NULL)
+ if (dwarf_attr_integrate(die, attribute, &attr) == nullptr)
return 0;
Dwarf_Addr value;
if (dwarf_formaddr(&attr, &value) == 0)
uint64_t default_value)
{
Dwarf_Attribute attr;
- if (dwarf_attr_integrate(die, attribute, &attr) == NULL)
+ if (dwarf_attr_integrate(die, attribute, &attr) == nullptr)
return default_value;
Dwarf_Word value;
return dwarf_formudata(dwarf_attr_integrate(die, attribute, &attr),
bool result;
if (dwarf_formflag(&attr, &result))
- xbt_die("Unexpected form for attribute %s", MC_dwarf_attrname(attribute));
+ xbt_die("Unexpected form for attribute %s",
+ simgrid::dwarf::attrname(attribute));
return result;
}
xbt_assert(dwarf_tag(die) == DW_TAG_enumeration_type
|| dwarf_tag(die) == DW_TAG_subrange_type,
"MC_dwarf_subrange_element_count called with DIE of type %s",
- MC_dwarf_die_tagname(die));
+ simgrid::dwarf::tagname(die));
// Use DW_TAG_count if present:
- if (dwarf_hasattr_integrate(die, DW_AT_count)) {
+ if (dwarf_hasattr_integrate(die, DW_AT_count))
return MC_dwarf_attr_integrate_uint(die, DW_AT_count, 0);
- }
// Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound + 1:
- if (!dwarf_hasattr_integrate(die, DW_AT_upper_bound)) {
+ if (!dwarf_hasattr_integrate(die, DW_AT_upper_bound))
// This is not really 0, but the code expects this (we do not know):
return 0;
- }
+
uint64_t upper_bound =
MC_dwarf_attr_integrate_uint(die, DW_AT_upper_bound, -1);
uint64_t lower_bound = 0;
- if (dwarf_hasattr_integrate(die, DW_AT_lower_bound)) {
+ if (dwarf_hasattr_integrate(die, DW_AT_lower_bound))
lower_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_lower_bound, -1);
- } else {
+ else
lower_bound = MC_dwarf_default_lower_bound(dwarf_srclang(unit));
- }
return upper_bound - lower_bound + 1;
}
{
xbt_assert(dwarf_tag(die) == DW_TAG_array_type,
"MC_dwarf_array_element_count called with DIE of type %s",
- MC_dwarf_die_tagname(die));
+ simgrid::dwarf::tagname(die));
int result = 1;
Dwarf_Die child;
res = dwarf_siblingof(&child, &child)) {
int child_tag = dwarf_tag(&child);
if (child_tag == DW_TAG_subrange_type
- || child_tag == DW_TAG_enumeration_type) {
+ || child_tag == DW_TAG_enumeration_type)
result *= MC_dwarf_subrange_element_count(&child, unit);
- }
}
return result;
}
-// ***** dw_type_t
+// ***** Variable
+
+/** Sort the variable by name and address.
+ *
+ * We could use boost::container::flat_set instead.
+ */
+static bool MC_compare_variable(
+ simgrid::mc::Variable const& a, simgrid::mc::Variable const& b)
+{
+ int cmp = strcmp(a.name.c_str(), b.name.c_str());
+ if (cmp < 0)
+ return true;
+ else if (cmp > 0)
+ return false;
+ else
+ return a.address < b.address;
+}
+
+// ***** simgrid::mc::Type*
/** \brief Initialize the location of a member of a type
* (DW_AT_data_member_location of a DW_TAG_member).
* \param member the member of the type
* \param child DIE of the member (DW_TAG_member)
*/
-static void MC_dwarf_fill_member_location(dw_type_t type, dw_type_t member,
- Dwarf_Die * child)
+static void MC_dwarf_fill_member_location(
+ simgrid::mc::Type* type, simgrid::mc::Member* member, Dwarf_Die * child)
{
- if (dwarf_hasattr(child, DW_AT_data_bit_offset)) {
+ if (dwarf_hasattr(child, DW_AT_data_bit_offset))
xbt_die("Can't groke DW_AT_data_bit_offset.");
- }
if (!dwarf_hasattr_integrate(child, DW_AT_data_member_location)) {
- if (type->type != DW_TAG_union_type) {
- xbt_die
- ("Missing DW_AT_data_member_location field in DW_TAG_member %s of type <%"
- PRIx64 ">%s", member->name, (uint64_t) type->id, type->name);
- } else {
+ if (type->type == DW_TAG_union_type)
return;
- }
+ xbt_die
+ ("Missing DW_AT_data_member_location field in DW_TAG_member %s of type <%"
+ PRIx64 ">%s", member->name.c_str(),
+ (uint64_t) type->id, type->name.c_str());
}
Dwarf_Attribute attr;
dwarf_attr_integrate(child, DW_AT_data_member_location, &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:
+ simgrid::dwarf::FormClass form_class = simgrid::dwarf::classify_form(form);
+ switch (form_class) {
+ case simgrid::dwarf::FormClass::ExprLoc:
+ case simgrid::dwarf::FormClass::Block:
// Location expression:
{
Dwarf_Op *expr;
size_t len;
- if (dwarf_getlocation(&attr, &expr, &len)) {
+ if (dwarf_getlocation(&attr, &expr, &len))
xbt_die
("Could not read location expression DW_AT_data_member_location in DW_TAG_member %s of type <%"
PRIx64 ">%s", MC_dwarf_attr_integrate_string(child, DW_AT_name),
- (uint64_t) type->id, type->name);
- }
- if (len == 1 && expr[0].atom == DW_OP_plus_uconst) {
- member->offset = expr[0].number;
- } else {
- mc_dwarf_expression_init(&member->location, len, expr);
- }
+ (uint64_t) type->id, type->name.c_str());
+ member->location_expression = simgrid::dwarf::DwarfExpression(expr, expr+len);
break;
}
- case MC_DW_CLASS_CONSTANT:
+ case simgrid::dwarf::FormClass::Constant:
// Offset from the base address of the object:
{
Dwarf_Word offset;
if (!dwarf_formudata(&attr, &offset))
- member->offset = offset;
+ member->offset(offset);
else
xbt_die("Cannot get %s location <%" PRIx64 ">%s",
MC_dwarf_attr_integrate_string(child, DW_AT_name),
- (uint64_t) type->id, type->name);
+ (uint64_t) type->id, type->name.c_str());
break;
}
- case MC_DW_CLASS_LOCLISTPTR:
+ case simgrid::dwarf::FormClass::LocListPtr:
// Reference to a location list:
// TODO
- case MC_DW_CLASS_REFERENCE:
+ case simgrid::dwarf::FormClass::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);
+ (int) form_class, form);
}
}
-static void dw_type_free_voidp(void *t)
-{
- delete *(dw_type_t*)t;
-}
-
/** \brief Populate the list of members of a type
*
* \param info ELF object containing the type DIE
* \param unit DIE of the compilation unit containing the type DIE
* \param type the type
*/
-static void MC_dwarf_add_members(mc_object_info_t info, Dwarf_Die * die,
- Dwarf_Die * unit, dw_type_t type)
+static void MC_dwarf_add_members(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Type* type)
{
int res;
Dwarf_Die child;
- xbt_assert(!type->members);
- type->members =
- xbt_dynar_new(sizeof(dw_type_t), (void (*)(void *)) dw_type_free_voidp);
+ xbt_assert(type->members.empty());
for (res = dwarf_child(die, &child); res == 0;
res = dwarf_siblingof(&child, &child)) {
int tag = dwarf_tag(&child);
continue;
// TODO, we should use another type (because is is not a type but a member)
- dw_type_t member = xbt_new0(s_dw_type_t, 1);
- member->type = tag;
-
- // Global Offset:
- member->id = dwarf_dieoffset(&child);
+ simgrid::mc::Member member;
+ member.inheritance = tag == DW_TAG_inheritance;
const char *name = MC_dwarf_attr_integrate_string(&child, DW_AT_name);
if (name)
- member->name = xbt_strdup(name);
- else
- member->name = NULL;
-
- member->byte_size =
+ member.name = name;
+ member.byte_size =
MC_dwarf_attr_integrate_uint(&child, DW_AT_byte_size, 0);
- member->element_count = -1;
- member->dw_type_id = MC_dwarf_at_type(&child);
- member->members = NULL;
- member->is_pointer_type = 0;
- member->offset = 0;
+ member.type_id = MC_dwarf_at_type(&child);
- if (dwarf_hasattr(&child, DW_AT_data_bit_offset)) {
+ if (dwarf_hasattr(&child, DW_AT_data_bit_offset))
xbt_die("Can't groke DW_AT_data_bit_offset.");
- }
- MC_dwarf_fill_member_location(type, member, &child);
+ MC_dwarf_fill_member_location(type, &member, &child);
- if (!member->dw_type_id) {
- xbt_die("Missing type for member %s of <%" PRIx64 ">%s", member->name,
- (uint64_t) type->id, type->name);
- }
+ if (!member.type_id)
+ xbt_die("Missing type for member %s of <%" PRIx64 ">%s",
+ member.name.c_str(),
+ (uint64_t) type->id, type->name.c_str());
- xbt_dynar_push(type->members, &member);
+ type->members.push_back(std::move(member));
}
}
}
* \param unit compilation unit of the current DIE
* \return MC representation of the type
*/
-static dw_type_t MC_dwarf_die_to_type(mc_object_info_t info, Dwarf_Die * die,
- Dwarf_Die * unit, dw_frame_t frame,
- const char *ns)
+static simgrid::mc::Type MC_dwarf_die_to_type(
+ simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Frame* frame,
+ const char *ns)
{
-
- dw_type_t type = new s_dw_type();
- type->type = -1;
- type->id = 0;
- type->name = NULL;
- type->byte_size = 0;
- type->element_count = -1;
- type->dw_type_id = NULL;
- type->members = NULL;
- type->is_pointer_type = 0;
- type->offset = 0;
-
- type->type = dwarf_tag(die);
+ simgrid::mc::Type type;
+ type.type = dwarf_tag(die);
+ type.name = std::string();
+ type.element_count = -1;
// Global Offset
- type->id = dwarf_dieoffset(die);
+ type.id = dwarf_dieoffset(die);
const char *prefix = "";
- switch (type->type) {
+ switch (type.type) {
case DW_TAG_structure_type:
prefix = "struct ";
break;
}
const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
- if (name != NULL) {
- type->name =
- ns ? bprintf("%s%s::%s", prefix, ns,
- name) : bprintf("%s%s", prefix, name);
+ if (name != nullptr) {
+ char* full_name = ns ? bprintf("%s%s::%s", prefix, ns, name) :
+ bprintf("%s%s", prefix, name);
+ type.name = std::string(full_name);
+ free(full_name);
}
- type->dw_type_id = MC_dwarf_at_type(die);
+ type.type_id = MC_dwarf_at_type(die);
// Some compilers do not emit DW_AT_byte_size for pointer_type,
// so we fill this. We currently assume that the model-checked process is in
// the same architecture..
- if (type->type == DW_TAG_pointer_type)
- type->byte_size = sizeof(void*);
+ if (type.type == DW_TAG_pointer_type)
+ type.byte_size = sizeof(void*);
// Computation of the byte_size;
if (dwarf_hasattr_integrate(die, DW_AT_byte_size))
- type->byte_size = MC_dwarf_attr_integrate_uint(die, DW_AT_byte_size, 0);
- else if (type->type == DW_TAG_array_type
- || type->type == DW_TAG_structure_type
- || type->type == DW_TAG_class_type) {
+ type.byte_size = MC_dwarf_attr_integrate_uint(die, DW_AT_byte_size, 0);
+ else if (type.type == DW_TAG_array_type
+ || type.type == DW_TAG_structure_type
+ || type.type == DW_TAG_class_type) {
Dwarf_Word size;
- if (dwarf_aggregate_size(die, &size) == 0) {
- type->byte_size = size;
- }
+ if (dwarf_aggregate_size(die, &size) == 0)
+ type.byte_size = size;
}
- switch (type->type) {
+ switch (type.type) {
case DW_TAG_array_type:
- type->element_count = MC_dwarf_array_element_count(die, unit);
+ type.element_count = MC_dwarf_array_element_count(die, unit);
// TODO, handle DW_byte_stride and (not) DW_bit_stride
break;
case DW_TAG_pointer_type:
case DW_TAG_reference_type:
case DW_TAG_rvalue_reference_type:
- type->is_pointer_type = 1;
break;
case DW_TAG_structure_type:
case DW_TAG_union_type:
case DW_TAG_class_type:
- MC_dwarf_add_members(info, die, unit, type);
- char *new_ns = ns == NULL ? xbt_strdup(type->name)
+ MC_dwarf_add_members(info, die, unit, &type);
+ char *new_ns = ns == nullptr ? xbt_strdup(type.name.c_str())
: bprintf("%s::%s", ns, name);
MC_dwarf_handle_children(info, die, unit, frame, new_ns);
free(new_ns);
break;
}
- return type;
+ return std::move(type);
}
-static void MC_dwarf_handle_type_die(mc_object_info_t info, Dwarf_Die * die,
- Dwarf_Die * unit, dw_frame_t frame,
+static void MC_dwarf_handle_type_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Frame* frame,
const char *ns)
{
- dw_type_t type = MC_dwarf_die_to_type(info, die, unit, frame, ns);
-
- char *key = bprintf("%" PRIx64, (uint64_t) type->id);
- xbt_dict_set(info->types, key, type, NULL);
- xbt_free(key);
-
- if (type->name && type->byte_size != 0) {
- xbt_dict_set(info->full_types_by_name, type->name, type, NULL);
- }
+ simgrid::mc::Type type = MC_dwarf_die_to_type(info, die, unit, frame, ns);
+ auto& t = (info->types[type.id] = std::move(type));
+ if (!t.name.empty() && type.byte_size != 0)
+ info->full_types_by_name[t.name] = &t;
}
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,
- const char *ns)
+static std::unique_ptr<simgrid::mc::Variable> MC_die_to_variable(
+ simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Frame* frame,
+ const char *ns)
{
// Skip declarations:
if (MC_dwarf_attr_flag(die, DW_AT_declaration, false))
- return NULL;
+ return nullptr;
// Skip compile time constants:
if (dwarf_hasattr(die, DW_AT_const_value))
- return NULL;
+ return nullptr;
Dwarf_Attribute attr_location;
- if (dwarf_attr(die, DW_AT_location, &attr_location) == NULL) {
+ if (dwarf_attr(die, DW_AT_location, &attr_location) == nullptr)
// No location: do not add it ?
- return NULL;
- }
+ return nullptr;
- dw_variable_t variable = xbt_new0(s_dw_variable_t, 1);
+ std::unique_ptr<simgrid::mc::Variable> variable =
+ std::unique_ptr<simgrid::mc::Variable>(new simgrid::mc::Variable());
variable->dwarf_offset = dwarf_dieoffset(die);
- variable->global = frame == NULL; // Can be override base on DW_AT_location
+ variable->global = frame == nullptr; // Can be override base on DW_AT_location
variable->object_info = info;
const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
- variable->name = xbt_strdup(name);
-
- variable->type_origin = MC_dwarf_at_type(die);
+ if (name)
+ variable->name = name;
+ variable->type_id = MC_dwarf_at_type(die);
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:
+ simgrid::dwarf::FormClass form_class;
+ if (form == DW_FORM_sec_offset)
+ form_class = simgrid::dwarf::FormClass::Constant;
+ else
+ form_class = simgrid::dwarf::classify_form(form);
+ switch (form_class) {
+ case simgrid::dwarf::FormClass::ExprLoc:
+ case simgrid::dwarf::FormClass::Block:
// Location expression:
{
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 <%"
- PRIx64 ">%s", (uint64_t) variable->dwarf_offset, variable->name);
+ xbt_die(
+ "Could not read location expression in DW_AT_location "
+ "of variable <%" PRIx64 ">%s",
+ (uint64_t) variable->dwarf_offset,
+ variable->name.c_str());
}
if (len == 1 && expr[0].atom == DW_OP_addr) {
uintptr_t offset = (uintptr_t) expr[0].number;
uintptr_t base = (uintptr_t) info->base_address();
variable->address = (void *) (base + offset);
- } else {
- mc_dwarf_location_list_init_from_expression(&variable->locations, len,
- expr);
- }
+ } else
+ variable->location_list = {
+ simgrid::dwarf::DwarfExpression(expr, expr + len) };
break;
}
- case MC_DW_CLASS_LOCLISTPTR:
- case MC_DW_CLASS_CONSTANT:
+
+ case simgrid::dwarf::FormClass::LocListPtr:
+ case simgrid::dwarf::FormClass::Constant:
// Reference to location list:
- mc_dwarf_location_list_init(&variable->locations, info, die,
- &attr_location);
+ variable->location_list = simgrid::dwarf::location_list(
+ *info, attr_location);
break;
+
default:
- xbt_die("Unexpected form 0x%x (%i), class 0x%x (%i) list for location in <%"
- PRIx64 ">%s", form, form, klass, klass,
- (uint64_t) variable->dwarf_offset, variable->name);
+ xbt_die("Unexpected form 0x%x (%i), class 0x%x (%i) list for location "
+ "in <%" PRIx64 ">%s",
+ form, form, (int) form_class, (int) form_class,
+ (uint64_t) variable->dwarf_offset,
+ variable->name.c_str());
}
// Handle start_scope:
Dwarf_Attribute attr;
dwarf_attr(die, DW_AT_start_scope, &attr);
int form = dwarf_whatform(&attr);
- int klass = MC_dwarf_form_get_class(form);
- switch (klass) {
- case MC_DW_CLASS_CONSTANT:
+ simgrid::dwarf::FormClass form_class = simgrid::dwarf::classify_form(form);
+ switch (form_class) {
+ case simgrid::dwarf::FormClass::Constant:
{
Dwarf_Word value;
variable->start_scope =
dwarf_formudata(&attr, &value) == 0 ? (size_t) value : 0;
break;
}
- case MC_DW_CLASS_RANGELISTPTR: // TODO
+
+ case simgrid::dwarf::FormClass::RangeListPtr: // TODO
default:
xbt_die
("Unhandled form 0x%x, class 0x%X for DW_AT_start_scope of variable %s",
- form, klass, name == NULL ? "?" : name);
+ form, (int) form_class, name == nullptr ? "?" : name);
}
}
- if (ns && variable->global) {
- char *old_name = variable->name;
- variable->name = bprintf("%s::%s", ns, old_name);
- free(old_name);
- }
+ if (ns && variable->global)
+ variable->name =
+ std::string(ns) + "::" + 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++);
- }
+ if (variable->name.empty())
+ variable->name =
+ "@anonymous#" + std::to_string(mc_anonymous_variable_index++);
- return variable;
+ return std::move(variable);
}
-static void MC_dwarf_handle_variable_die(mc_object_info_t info, Dwarf_Die * die,
- Dwarf_Die * unit, dw_frame_t frame,
+static void MC_dwarf_handle_variable_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Frame* frame,
const char *ns)
{
- dw_variable_t variable =
- MC_die_to_variable(info, die, unit, frame, ns);
- if (variable == NULL)
+ std::unique_ptr<simgrid::mc::Variable> variable =
+ MC_die_to_variable(info, die, unit, frame, ns);
+ if (!variable)
return;
- MC_dwarf_register_variable(info, frame, variable);
-}
-
-static void mc_frame_free_voipd(dw_frame_t * p)
-{
- mc_frame_free(*p);
- *p = NULL;
+ // Those arrays are sorted later:
+ else if (variable->global)
+ info->global_variables.push_back(std::move(*variable));
+ else if (frame != nullptr)
+ frame->variables.push_back(std::move(*variable));
+ else
+ xbt_die("No frame for this local variable");
}
-static void MC_dwarf_handle_scope_die(mc_object_info_t info, Dwarf_Die * die,
- Dwarf_Die * unit, dw_frame_t parent_frame,
+static void MC_dwarf_handle_scope_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Frame* parent_frame,
const char *ns)
{
// TODO, handle DW_TAG_type/DW_TAG_location for DW_TAG_with_stmt
int tag = dwarf_tag(die);
- mc_tag_class klass = MC_dwarf_tag_classify(tag);
+ simgrid::dwarf::TagClass klass = simgrid::dwarf::classify_tag(tag);
// (Template) Subprogram declaration:
- if (klass == mc_tag_subprogram
+ if (klass == simgrid::dwarf::TagClass::Subprogram
&& MC_dwarf_attr_flag(die, DW_AT_declaration, false))
return;
- if (klass == mc_tag_scope)
+ if (klass == simgrid::dwarf::TagClass::Scope)
xbt_assert(parent_frame, "No parent scope for this scope");
- dw_frame_t frame = xbt_new0(s_dw_frame_t, 1);
-
- frame->tag = tag;
- frame->id = dwarf_dieoffset(die);
- frame->object_info = info;
+ simgrid::mc::Frame frame;
+ frame.tag = tag;
+ frame.id = dwarf_dieoffset(die);
+ frame.object_info = info;
- if (klass == mc_tag_subprogram) {
+ if (klass == simgrid::dwarf::TagClass::Subprogram) {
const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
- frame->name =
- ns ? bprintf("%s::%s", ns, name) : xbt_strdup(name);
+ if (ns)
+ frame.name = std::string(ns) + "::" + name;
+ else if (name)
+ frame.name = name;
}
- frame->abstract_origin_id =
- MC_dwarf_attr_dieoffset(die, DW_AT_abstract_origin);
+ frame.abstract_origin_id =
+ MC_dwarf_attr_dieoffset(die, DW_AT_abstract_origin);
// This is the base address for DWARF addresses.
// Relocated addresses are offset from this base address.
// See DWARF4 spec 7.5
- void *base = info->base_address();
-
- // 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);
+ std::uint64_t base = (std::uint64_t) info->base_address();
// TODO, support DW_AT_ranges
uint64_t low_pc = MC_dwarf_attr_integrate_addr(die, DW_AT_low_pc);
- frame->low_pc = low_pc ? ((char *) base) + low_pc : 0;
+ frame.range.begin() = low_pc ? (std::uint64_t) base + low_pc : 0;
if (low_pc) {
// DW_AT_high_pc:
Dwarf_Attribute attr;
- if (!dwarf_attr_integrate(die, DW_AT_high_pc, &attr)) {
+ if (!dwarf_attr_integrate(die, DW_AT_high_pc, &attr))
xbt_die("Missing DW_AT_high_pc matching with DW_AT_low_pc");
- }
Dwarf_Sword offset;
Dwarf_Addr high_pc;
- switch (MC_dwarf_form_get_class(dwarf_whatform(&attr))) {
+ switch (simgrid::dwarf::classify_form(dwarf_whatform(&attr))) {
// DW_AT_high_pc if an offset from the low_pc:
- case MC_DW_CLASS_CONSTANT:
+ case simgrid::dwarf::FormClass::Constant:
if (dwarf_formsdata(&attr, &offset) != 0)
xbt_die("Could not read constant");
- frame->high_pc = (void *) ((char *) frame->low_pc + offset);
+ frame.range.end() = frame.range.begin() + offset;
break;
// DW_AT_high_pc is a relocatable address:
- case MC_DW_CLASS_ADDRESS:
+ case simgrid::dwarf::FormClass::Address:
if (dwarf_formaddr(&attr, &high_pc) != 0)
xbt_die("Could not read address");
- frame->high_pc = ((char *) base) + high_pc;
+ frame.range.begin() = base + high_pc;
break;
default:
}
}
- if (klass == mc_tag_subprogram) {
+ if (klass == simgrid::dwarf::TagClass::Subprogram) {
Dwarf_Attribute attr_frame_base;
if (dwarf_attr_integrate(die, DW_AT_frame_base, &attr_frame_base))
- mc_dwarf_location_list_init(&frame->frame_base, info, die,
- &attr_frame_base);
+ frame.frame_base_location = simgrid::dwarf::location_list(*info,
+ attr_frame_base);
}
- frame->scopes =
- xbt_dynar_new(sizeof(dw_frame_t), (void_f_pvoid_t) mc_frame_free_voipd);
+ // Handle children:
+ MC_dwarf_handle_children(info, die, unit, &frame, ns);
+
+ // We sort them in order to have an (somewhat) efficient by name
+ // lookup:
+ std::sort(frame.variables.begin(), frame.variables.end(),
+ MC_compare_variable);
// Register it:
- if (klass == mc_tag_subprogram) {
- char *key = bprintf("%" PRIx64, (uint64_t) frame->id);
- xbt_dict_set(info->subprograms, key, frame, NULL);
- xbt_free(key);
- } else if (klass == mc_tag_scope) {
- xbt_dynar_push(parent_frame->scopes, &frame);
- }
- // Handle children:
- MC_dwarf_handle_children(info, die, unit, frame, ns);
+ if (klass == simgrid::dwarf::TagClass::Subprogram)
+ info->subprograms[frame.id] = std::move(frame);
+ else if (klass == simgrid::dwarf::TagClass::Scope)
+ parent_frame->scopes.push_back(std::move(frame));
}
-static void mc_dwarf_handle_namespace_die(mc_object_info_t info,
+static void mc_dwarf_handle_namespace_die(simgrid::mc::ObjectInformation* info,
Dwarf_Die * die, Dwarf_Die * unit,
- dw_frame_t frame,
+ simgrid::mc::Frame* frame,
const char *ns)
{
const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
if (frame)
xbt_die("Unexpected namespace in a subprogram");
- char *new_ns = ns == NULL ? xbt_strdup(name)
+ char *new_ns = ns == nullptr ? xbt_strdup(name)
: bprintf("%s::%s", ns, name);
MC_dwarf_handle_children(info, die, unit, frame, new_ns);
xbt_free(new_ns);
}
-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_children(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Frame* frame,
const char *ns)
{
// For each child DIE:
Dwarf_Die child;
int res;
for (res = dwarf_child(die, &child); res == 0;
- res = dwarf_siblingof(&child, &child)) {
+ res = dwarf_siblingof(&child, &child))
MC_dwarf_handle_die(info, &child, unit, frame, ns);
- }
}
-static void MC_dwarf_handle_die(mc_object_info_t info, Dwarf_Die * die,
- Dwarf_Die * unit, dw_frame_t frame,
+static void MC_dwarf_handle_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
+ Dwarf_Die * unit, simgrid::mc::Frame* frame,
const char *ns)
{
int tag = dwarf_tag(die);
- mc_tag_class klass = MC_dwarf_tag_classify(tag);
+ simgrid::dwarf::TagClass klass = simgrid::dwarf::classify_tag(tag);
switch (klass) {
// Type:
- case mc_tag_type:
+ case simgrid::dwarf::TagClass::Type:
MC_dwarf_handle_type_die(info, die, unit, frame, ns);
break;
// Subprogram or scope:
- case mc_tag_subprogram:
- case mc_tag_scope:
+ case simgrid::dwarf::TagClass::Subprogram:
+ case simgrid::dwarf::TagClass::Scope:
MC_dwarf_handle_scope_die(info, die, unit, frame, ns);
return;
// Variable:
- case mc_tag_variable:
+ case simgrid::dwarf::TagClass::Variable:
MC_dwarf_handle_variable_die(info, die, unit, frame, ns);
break;
- case mc_tag_namespace:
+ case simgrid::dwarf::TagClass::Namespace:
mc_dwarf_handle_namespace_die(info, die, unit, frame, ns);
break;
}
}
-/** \brief Populate the debugging informations of the given ELF object
- *
- * Read the DWARf information of the EFFL object and populate the
- * lists of types, variables, functions.
- */
-void MC_dwarf_get_variables(mc_object_info_t info)
+static
+Elf64_Half get_type(Elf* elf)
+{
+ Elf64_Ehdr* ehdr64 = elf64_getehdr(elf);
+ if (ehdr64)
+ return ehdr64->e_type;
+ Elf32_Ehdr* ehdr32 = elf32_getehdr(elf);
+ if (ehdr32)
+ return ehdr32->e_type;
+ xbt_die("Could not get ELF heeader");
+}
+
+static
+void read_dwarf_info(simgrid::mc::ObjectInformation* info, Dwarf* dwarf)
{
- int fd = open(info->file_name, O_RDONLY);
- if (fd < 0) {
- xbt_die("Could not open file %s", info->file_name);
- }
- Dwarf *dwarf = dwarf_begin(fd, DWARF_C_READ);
- if (dwarf == NULL) {
- xbt_die("Your program must be compiled with -g (%s)", info->file_name);
- }
// For each compilation unit:
Dwarf_Off offset = 0;
Dwarf_Off next_offset = 0;
size_t length;
- while (dwarf_nextcu(dwarf, offset, &next_offset, &length, NULL, NULL, NULL) ==
+
+ while (dwarf_nextcu(dwarf, offset, &next_offset, &length, nullptr, NULL, NULL) ==
0) {
Dwarf_Die unit_die;
- if (dwarf_offdie(dwarf, offset + length, &unit_die) != NULL) {
-
- // For each child DIE:
- 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, NULL);
- }
-
- }
+ if (dwarf_offdie(dwarf, offset + length, &unit_die) != nullptr)
+ MC_dwarf_handle_children(info, &unit_die, &unit_die, nullptr, NULL);
offset = next_offset;
}
-
- dwarf_end(dwarf);
- close(fd);
}
-/************************** Free functions *************************/
-
-void mc_frame_free(dw_frame_t frame)
+/** Get the build-id (NT_GNU_BUILD_ID) from the ELF file
+ *
+ * This build-id may is used to locate an external debug (DWARF) file
+ * for this ELF file.
+ *
+ * @param elf libelf handle for an ELF file
+ * @return build-id for this ELF file (or an empty vector if none is found)
+ */
+static
+std::vector<char> get_build_id(Elf* elf)
{
- xbt_free(frame->name);
- mc_dwarf_location_list_clear(&(frame->frame_base));
- xbt_dynar_free(&(frame->variables));
- xbt_dynar_free(&(frame->scopes));
- xbt_free(frame);
-}
+ size_t phnum;
+ if (elf_getphdrnum (elf, &phnum) != 0)
+ xbt_die("Could not read program headers");
+
+ // Iterate over the program headers and find the PT_NOTE ones:
+ for (size_t i = 0; i < phnum; ++i) {
+ GElf_Phdr phdr_temp;
+ GElf_Phdr *phdr = gelf_getphdr(elf, i, &phdr_temp);
+ if (phdr->p_type != PT_NOTE)
+ continue;
-s_dw_type::s_dw_type()
-{
- this->type = 0;
- this->id = 0;
- this->name = nullptr;
- this->byte_size = 0;
- this->element_count = 0;
- this->dw_type_id = nullptr;
- this->members = nullptr;
- this->is_pointer_type = 0;
- this->location = { 0, 0, 0, 0};
- this->offset = 0;
- this->subtype = nullptr;
- this->full_type = nullptr;
-}
+ Elf_Data* data = elf_getdata_rawchunk(elf, phdr->p_offset, phdr->p_filesz, ELF_T_NHDR);
+
+ // Iterate over the notes and find the NT_GNU_BUILD_ID one:
+ size_t pos = 0;
+ while (1) {
+ GElf_Nhdr nhdr;
+ size_t name_pos;
+ size_t desc_pos;
+ pos = gelf_getnote(data, pos, &nhdr, &name_pos, &desc_pos);
+ // A note is identified by a name "GNU" and a integer type within
+ // the namespace defined by this name (here NT_GNU_BUILD_ID):
+ if (nhdr.n_type == NT_GNU_BUILD_ID
+ && nhdr.n_namesz == sizeof("GNU")
+ && memcmp((char*) data->d_buf + name_pos, "GNU", sizeof("GNU")) == 0) {
+
+ // Found the NT_GNU_BUILD_ID note:
+ char* start = (char*) data->d_buf + desc_pos;
+ char* end = (char*) start + nhdr.n_descsz;
+ return std::vector<char>(start, end);
-s_dw_type::~s_dw_type()
-{
- xbt_free(this->name);
- xbt_free(this->dw_type_id);
- xbt_dynar_free(&this->members);
- mc_dwarf_expression_clear(&this->location);
+ }
+ }
+
+ }
+ return std::vector<char>();
}
-static void dw_type_free(dw_type_t t)
+static char hexdigits[16] = {
+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+ 'a', 'b', 'c', 'd', 'e', 'f'
+};
+
+/** Binary data to hexadecimal */
+static inline
+std::array<char, 2> to_hex(std::uint8_t byte)
{
- delete t;
+ // Horrid double braces!
+ // Apparently, this is needed in C++11 (not in C++14).
+ return { { hexdigits[byte >> 4], hexdigits[byte & 0xF] } };
}
-void dw_variable_free(dw_variable_t v)
+/** Binary data to hexadecimal */
+static
+std::string to_hex(const char* data, std::size_t count)
{
- if (v) {
- xbt_free(v->name);
- xbt_free(v->type_origin);
-
- if (v->locations.locations)
- mc_dwarf_location_list_clear(&v->locations);
- xbt_free(v);
+ std::string res;
+ res.resize(2*count);
+ for (std::size_t i = 0; i < count; i++) {
+ std::array<char, 2> hex_byte = to_hex(data[i]);
+ for (int j = 0; j < 2; ++j)
+ res[2 * i + j] = hex_byte[j];
}
+ return std::move(res);
}
-void dw_variable_free_voidp(void *t)
+/** Binary data to hexadecimal */
+static
+std::string to_hex(std::vector<char> const& data)
{
- dw_variable_free((dw_variable_t) * (void **) t);
+ return to_hex(data.data(), data.size());
}
-// ***** object_info
-
-namespace simgrid {
-namespace mc {
-
-ObjectInformation::ObjectInformation()
-{
- this->flags = 0;
- this->file_name = nullptr;
- this->start = nullptr;
- this->end = nullptr;
- this->start_exec = nullptr;
- this->end_exec = nullptr;
- this->start_rw = nullptr;
- this->end_rw = nullptr;
- this->start_ro = nullptr;
- this->end_ro = nullptr;
- this->subprograms = xbt_dict_new_homogeneous((void (*)(void *)) mc_frame_free);
- this->global_variables =
- xbt_dynar_new(sizeof(dw_variable_t), dw_variable_free_voidp);
- this->types = xbt_dict_new_homogeneous((void (*)(void *)) dw_type_free);
- this->full_types_by_name = xbt_dict_new_homogeneous(NULL);
- this->functions_index = nullptr;
-}
+/** Base directories for external debug files */
+static
+const char* debug_paths[] = {
+ "/usr/lib/debug/",
+ "/usr/local/lib/debug/",
+};
-ObjectInformation::~ObjectInformation()
+/** Locate an external debug file from the NT_GNU_BUILD_ID
+ *
+ * This is one of the mechanisms used for
+ * [separate debug files](https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html).
+ */
+static
+std::string find_by_build_id(std::vector<char> id)
{
- xbt_free(this->file_name);
- xbt_dict_free(&this->subprograms);
- xbt_dynar_free(&this->global_variables);
- xbt_dict_free(&this->types);
- xbt_dict_free(&this->full_types_by_name);
- xbt_dynar_free(&this->functions_index);
+ std::string filename;
+ for (const char* debug_path : debug_paths) {
+ filename = debug_path;
+ filename += ".build-id/" + to_hex(id.data(), 1) + '/'
+ + to_hex(id.data() + 1, id.size() - 1) + ".debug";
+ XBT_DEBUG("Checking debug file: %s", filename.c_str());
+ if (access(filename.c_str(), F_OK) == 0)
+ return std::move(filename);
+ }
+ return std::string();
}
-/** Find the DWARF offset for this ELF object
- *
- * An offset is applied to address found in DWARF:
- *
- * <ul>
- * <li>for an executable obejct, addresses are virtual address
- * (there is no offset) i.e. \f$\text{virtual address} = \{dwarf address}\f$;</li>
- * <li>for a shared object, the addreses are offset from the begining
- * of the shared object (the base address of the mapped shared
- * object must be used as offset
- * i.e. \f$\text{virtual address} = \text{shared object base address}
- * + \text{dwarf address}\f$.</li>
+/** \brief Populate the debugging informations of the given ELF object
*
+ * Read the DWARf information of the EFFL object and populate the
+ * lists of types, variables, functions.
*/
-void *ObjectInformation::base_address() const
+static
+void MC_dwarf_get_variables(simgrid::mc::ObjectInformation* info)
{
- if (this->executable())
- return nullptr;
+ if (elf_version(EV_CURRENT) == EV_NONE)
+ xbt_die("libelf initialization error");
+
+ // Open the ELF file:
+ int fd = open(info->file_name.c_str(), O_RDONLY);
+ if (fd < 0)
+ xbt_die("Could not open file %s", info->file_name.c_str());
+ Elf* elf = elf_begin(fd, ELF_C_READ, nullptr);
+ if (elf == nullptr)
+ xbt_die("Not an ELF file 1");
+ Elf_Kind kind = elf_kind(elf);
+ if (kind != ELF_K_ELF)
+ xbt_die("Not an ELF file 2");
+
+ // Remember if this is a `ET_EXEC` (fixed location) or `ET_DYN` (relocatable):
+ Elf64_Half type = get_type(elf);
+ if (type == ET_EXEC)
+ info->flags |= simgrid::mc::ObjectInformation::Executable;
+
+ // Read DWARF debug information in the file:
+ Dwarf* dwarf = dwarf_begin_elf (elf, DWARF_C_READ, nullptr);
+ if (dwarf != nullptr) {
+ read_dwarf_info(info, dwarf);
+ dwarf_end(dwarf);
+ elf_end(elf);
+ close(fd);
+ return;
+ }
+ dwarf_end(dwarf);
- void *result = this->start_exec;
- if (this->start_rw != NULL && result > (void *) this->start_rw)
- result = this->start_rw;
- if (this->start_ro != NULL && result > (void *) this->start_ro)
- result = this->start_ro;
- return result;
-}
+ // If there was no DWARF in the file, try to find it in a separate file
+ // with NT_GNU_BUILD_ID:
+ std::vector<char> build_id = get_build_id(elf);
+ if (!build_id.empty()) {
+ elf_end(elf);
+ close(fd);
+
+ // Find the debug file using the build id:
+ std::string debug_file = find_by_build_id(build_id);
+ if (debug_file.empty()) {
+ std::string hex = to_hex(build_id);
+ xbt_die(
+ "Missing debug info for %s with build-id %s\n"
+ "You might want to install the suitable debugging package.\n",
+ info->file_name.c_str(), hex.c_str());
+ }
-}
-}
+ // Load the DWARF info from this file:
+ XBT_DEBUG("Load DWARF for %s from %s",
+ info->file_name.c_str(), debug_file.c_str());
+ fd = open(debug_file.c_str(), O_RDONLY);
+ if (fd < 0)
+ xbt_die("Could not open file %s", debug_file.c_str());
+ Dwarf* dwarf = dwarf_begin(fd, DWARF_C_READ);
+ if (dwarf == nullptr)
+ xbt_die("No DWARF info in %s for %s",
+ debug_file.c_str(), info->file_name.c_str());
+ read_dwarf_info(info, dwarf);
+ dwarf_end(dwarf);
+ close(fd);
+ return;
+ }
-// ***** Helpers
+ // TODO, try to find DWARF info using debug-link.
+ // Is this method really used anywhere?
+
+ xbt_die("Debugging information not found for %s\n"
+ "Try recompiling with -g\n",
+ info->file_name.c_str());
+}
// ***** Functions index
-static int MC_compare_frame_index_items(mc_function_index_item_t a,
- mc_function_index_item_t b)
+static int MC_compare_frame_index_items(simgrid::mc::FunctionIndexEntry* a,
+ simgrid::mc::FunctionIndexEntry* b)
{
if (a->low_pc < b->low_pc)
return -1;
return 1;
}
-static void MC_make_functions_index(mc_object_info_t info)
+static void MC_make_functions_index(simgrid::mc::ObjectInformation* info)
{
- xbt_dynar_t index = xbt_dynar_new(sizeof(s_mc_function_index_item_t), NULL);
-
- // Populate the array:
- dw_frame_t frame = NULL;
- xbt_dict_cursor_t cursor;
- char *key;
- xbt_dict_foreach(info->subprograms, cursor, key, frame) {
- if (frame->low_pc == NULL)
+ info->functions_index.clear();
+
+ for (auto& e : info->subprograms) {
+ if (e.second.range.begin() == 0)
continue;
- s_mc_function_index_item_t entry;
- entry.low_pc = frame->low_pc;
- entry.high_pc = frame->high_pc;
- entry.function = frame;
- xbt_dynar_push(index, &entry);
+ simgrid::mc::FunctionIndexEntry entry;
+ entry.low_pc = (void*) e.second.range.begin();
+ entry.function = &e.second;
+ info->functions_index.push_back(entry);
}
- mc_function_index_item_t base =
- (mc_function_index_item_t) xbt_dynar_get_ptr(index, 0);
+ info->functions_index.shrink_to_fit();
// Sort the array by low_pc:
- qsort(base,
- xbt_dynar_length(index),
- sizeof(s_mc_function_index_item_t),
- (int (*)(const void *, const void *)) MC_compare_frame_index_items);
-
- info->functions_index = index;
+ std::sort(info->functions_index.begin(), info->functions_index.end(),
+ [](simgrid::mc::FunctionIndexEntry const& a,
+ simgrid::mc::FunctionIndexEntry const& b)
+ {
+ return a.low_pc < b.low_pc;
+ });
}
-static void MC_post_process_variables(mc_object_info_t info)
+static void MC_post_process_variables(simgrid::mc::ObjectInformation* info)
{
- unsigned cursor = 0;
- dw_variable_t variable = NULL;
- xbt_dynar_foreach(info->global_variables, cursor, variable) {
- if (variable->type_origin) {
- variable->type = (dw_type_t) xbt_dict_get_or_null(info->types, variable->type_origin);
- }
- }
+ // Someone needs this to be sorted but who?
+ std::sort(info->global_variables.begin(), info->global_variables.end(),
+ MC_compare_variable);
+
+ for(simgrid::mc::Variable& variable : info->global_variables)
+ if (variable.type_id)
+ variable.type = simgrid::util::find_map_ptr(
+ info->types, variable.type_id);
}
-static void mc_post_process_scope(mc_object_info_t info, dw_frame_t scope)
+static void mc_post_process_scope(simgrid::mc::ObjectInformation* info, simgrid::mc::Frame* scope)
{
if (scope->tag == DW_TAG_inlined_subroutine) {
-
// Attach correct namespaced name in inlined subroutine:
- char *key = bprintf("%" PRIx64, (uint64_t) scope->abstract_origin_id);
- dw_frame_t abstract_origin = (dw_frame_t) xbt_dict_get_or_null(info->subprograms, key);
- xbt_assert(abstract_origin, "Could not lookup abstract origin %s", key);
- xbt_free(key);
- scope->name = xbt_strdup(abstract_origin->name);
-
+ auto i = info->subprograms.find(scope->abstract_origin_id);
+ xbt_assert(i != info->subprograms.end(),
+ "Could not lookup abstract origin %" PRIx64,
+ (std::uint64_t) scope->abstract_origin_id);
+ scope->name = i->second.name;
}
+
// Direct:
- unsigned cursor = 0;
- dw_variable_t variable = NULL;
- xbt_dynar_foreach(scope->variables, cursor, variable) {
- if (variable->type_origin) {
- variable->type = (dw_type_t) xbt_dict_get_or_null(info->types, variable->type_origin);
- }
- }
+ for (simgrid::mc::Variable& variable : scope->variables)
+ if (variable.type_id)
+ variable.type = simgrid::util::find_map_ptr(
+ info->types, variable.type_id);
// Recursive post-processing of nested-scopes:
- dw_frame_t nested_scope = NULL;
- xbt_dynar_foreach(scope->scopes, cursor, nested_scope)
- mc_post_process_scope(info, nested_scope);
+ for (simgrid::mc::Frame& nested_scope : scope->scopes)
+ mc_post_process_scope(info, &nested_scope);
}
-static void MC_post_process_functions(mc_object_info_t info)
+static
+simgrid::mc::Type* MC_resolve_type(
+ simgrid::mc::ObjectInformation* info, unsigned type_id)
{
- xbt_dict_cursor_t cursor;
- char *key;
- dw_frame_t subprogram = NULL;
- xbt_dict_foreach(info->subprograms, cursor, key, subprogram) {
- mc_post_process_scope(info, subprogram);
- }
-}
+ if (!type_id)
+ return nullptr;
+ simgrid::mc::Type* type = simgrid::util::find_map_ptr(info->types, type_id);
+ if (type == nullptr)
+ return nullptr;
+ // We already have the information on the type:
+ if (type->byte_size != 0)
+ return type;
-/** \brief Fill/lookup the "subtype" field.
- */
-static void MC_resolve_subtype(mc_object_info_t info, dw_type_t type)
-{
+ // Don't have a name, we can't find a more complete version:
+ if (type->name.empty())
+ return type;
- if (type->dw_type_id == NULL)
- return;
- type->subtype = (dw_type_t) xbt_dict_get_or_null(info->types, type->dw_type_id);
- if (type->subtype == NULL)
- return;
- if (type->subtype->byte_size != 0)
- return;
- if (type->subtype->name == NULL)
- return;
// Try to find a more complete description of the type:
// We need to fix in order to support C++.
-
- dw_type_t subtype =
- (dw_type_t) xbt_dict_get_or_null(info->full_types_by_name, type->subtype->name);
- if (subtype != NULL) {
- type->subtype = subtype;
- }
-
+ simgrid::mc::Type** subtype = simgrid::util::find_map_ptr(
+ info->full_types_by_name, type->name);
+ if (subtype)
+ type = *subtype;
+ return type;
}
-static void MC_post_process_types(mc_object_info_t info)
+static void MC_post_process_types(simgrid::mc::ObjectInformation* info)
{
- xbt_dict_cursor_t cursor = NULL;
- char *origin;
- dw_type_t type;
-
// Lookup "subtype" field:
- xbt_dict_foreach(info->types, cursor, origin, type) {
- MC_resolve_subtype(info, type);
-
- dw_type_t member;
- unsigned int i = 0;
- if (type->members != NULL)
- xbt_dynar_foreach(type->members, i, member) {
- MC_resolve_subtype(info, member);
- }
+ for(auto& i : info->types) {
+ i.second.subtype = MC_resolve_type(info, i.second.type_id);
+ for (simgrid::mc::Member& member : i.second.members)
+ member.type = MC_resolve_type(info, member.type_id);
}
}
+namespace simgrid {
+namespace mc {
+
/** \brief Finds informations about a given shared object/executable */
-std::shared_ptr<s_mc_object_info_t> MC_find_object_info(
- std::vector<simgrid::mc::VmMap> const& maps, const char *name, int executable)
+std::shared_ptr<simgrid::mc::ObjectInformation> createObjectInformation(
+ std::vector<simgrid::xbt::VmMap> const& maps, const char *name)
{
- std::shared_ptr<s_mc_object_info_t> result =
- std::make_shared<s_mc_object_info_t>();
- if (executable)
- result->flags |= MC_OBJECT_INFO_EXECUTABLE;
- result->file_name = xbt_strdup(name);
- MC_find_object_address(maps, result.get());
+ std::shared_ptr<simgrid::mc::ObjectInformation> result =
+ std::make_shared<simgrid::mc::ObjectInformation>();
+ result->file_name = name;
+ simgrid::mc::find_object_address(maps, result.get());
MC_dwarf_get_variables(result.get());
- MC_post_process_types(result.get());
MC_post_process_variables(result.get());
- MC_post_process_functions(result.get());
+ MC_post_process_types(result.get());
+ for (auto& entry : result.get()->subprograms)
+ mc_post_process_scope(result.get(), &entry.second);
MC_make_functions_index(result.get());
return std::move(result);
}
/*************************************************************************/
-static int MC_dwarf_get_variable_index(xbt_dynar_t variables, char *var,
- void *address)
+void postProcessObjectInformation(simgrid::mc::Process* process, simgrid::mc::ObjectInformation* info)
{
+ for (auto& i : info->types) {
- if (xbt_dynar_is_empty(variables))
- return 0;
-
- unsigned int cursor = 0;
- int start = 0;
- int end = xbt_dynar_length(variables) - 1;
- dw_variable_t var_test = NULL;
-
- while (start <= end) {
- cursor = (start + end) / 2;
- var_test =
- (dw_variable_t) xbt_dynar_get_as(variables, cursor, dw_variable_t);
- if (strcmp(var_test->name, var) < 0) {
- start = cursor + 1;
- } else if (strcmp(var_test->name, var) > 0) {
- end = cursor - 1;
- } else {
- if (address) { /* global variable */
- if (var_test->address == address)
- return -1;
- if (var_test->address > address)
- end = cursor - 1;
- else
- start = cursor + 1;
- } else { /* local variable */
- return -1;
- }
- }
- }
-
- if (strcmp(var_test->name, var) == 0) {
- if (address && var_test->address < address)
- return cursor + 1;
- else
- return cursor;
- } else if (strcmp(var_test->name, var) < 0)
- return cursor + 1;
- else
- return cursor;
-
-}
-
-void MC_dwarf_register_global_variable(mc_object_info_t info,
- dw_variable_t variable)
-{
- int index =
- MC_dwarf_get_variable_index(info->global_variables, variable->name,
- variable->address);
- if (index != -1)
- xbt_dynar_insert_at(info->global_variables, index, &variable);
- // TODO, else ?
-}
-
-void MC_dwarf_register_non_global_variable(mc_object_info_t info,
- dw_frame_t frame,
- dw_variable_t variable)
-{
- xbt_assert(frame, "Frame is NULL");
- int index =
- MC_dwarf_get_variable_index(frame->variables, variable->name, NULL);
- if (index != -1)
- xbt_dynar_insert_at(frame->variables, index, &variable);
- // TODO, else ?
-}
-
-void MC_dwarf_register_variable(mc_object_info_t info, dw_frame_t frame,
- dw_variable_t variable)
-{
- if (variable->global)
- MC_dwarf_register_global_variable(info, variable);
- else if (frame == NULL)
- xbt_die("No frame for this local variable");
- else
- MC_dwarf_register_non_global_variable(info, frame, variable);
-}
-
-void MC_post_process_object_info(mc_process_t process, mc_object_info_t info)
-{
- xbt_dict_cursor_t cursor = NULL;
- char *key = NULL;
- dw_type_t type = NULL;
- xbt_dict_foreach(info->types, cursor, key, type) {
-
- dw_type_t subtype = type;
- while (subtype->type == DW_TAG_typedef || subtype->type == DW_TAG_volatile_type
- || subtype->type == DW_TAG_const_type) {
+ simgrid::mc::Type* type = &(i.second);
+ simgrid::mc::Type* subtype = type;
+ while (subtype->type == DW_TAG_typedef
+ || subtype->type == DW_TAG_volatile_type
+ || subtype->type == DW_TAG_const_type)
if (subtype->subtype)
subtype = subtype->subtype;
else
break;
- }
// Resolve full_type:
- if (subtype->name && subtype->byte_size == 0) {
+ if (!subtype->name.empty() && subtype->byte_size == 0)
for (auto const& object_info : process->object_infos) {
- dw_type_t same_type = (dw_type_t)
- xbt_dict_get_or_null(object_info->full_types_by_name,
- subtype->name);
- if (same_type && same_type->name && same_type->byte_size) {
- type->full_type = same_type;
+ auto i = object_info->full_types_by_name.find(subtype->name);
+ if (i != object_info->full_types_by_name.end()
+ && !i->second->name.empty() && i->second->byte_size) {
+ type->full_type = i->second;
break;
}
}
- } else type->full_type = subtype;
+ else type->full_type = subtype;
}
}
+
+}
+}
+
+namespace simgrid {
+namespace dwarf {
+
+/** Convert a DWARF register into a libunwind register
+ *
+ * DWARF and libunwind does not use the same convention for numbering the
+ * registers on some architectures. The function makes the necessary
+ * convertion.
+ */
+int dwarf_register_to_libunwind(int dwarf_register)
+{
+#if defined(__x86_64__)
+ // It seems for this arch, DWARF and libunwind agree in the numbering:
+ return dwarf_register;
+#elif defined(__i386__)
+ // Could't find the authoritative source of information for this.
+ // This is inspired from http://source.winehq.org/source/dlls/dbghelp/cpu_i386.c#L517.
+ switch (dwarf_register) {
+ case 0:
+ return UNW_X86_EAX;
+ case 1:
+ return UNW_X86_ECX;
+ case 2:
+ return UNW_X86_EDX;
+ case 3:
+ return UNW_X86_EBX;
+ case 4:
+ return UNW_X86_ESP;
+ case 5:
+ return UNW_X86_EBP;
+ case 6:
+ return UNW_X86_ESI;
+ case 7:
+ return UNW_X86_EDI;
+ case 8:
+ return UNW_X86_EIP;
+ case 9:
+ return UNW_X86_EFLAGS;
+ case 10:
+ return UNW_X86_CS;
+ case 11:
+ return UNW_X86_SS;
+ case 12:
+ return UNW_X86_DS;
+ case 13:
+ return UNW_X86_ES;
+ case 14:
+ return UNW_X86_FS;
+ case 15:
+ return UNW_X86_GS;
+ case 16:
+ return UNW_X86_ST0;
+ case 17:
+ return UNW_X86_ST1;
+ case 18:
+ return UNW_X86_ST2;
+ case 19:
+ return UNW_X86_ST3;
+ case 20:
+ return UNW_X86_ST4;
+ case 21:
+ return UNW_X86_ST5;
+ case 22:
+ return UNW_X86_ST6;
+ case 23:
+ return UNW_X86_ST7;
+ default:
+ xbt_die("Bad/unknown register number.");
+ }
+#else
+#error This architecture is not supported yet for DWARF expression evaluation.
+#endif
+}
+
+}
+}
