-/* Copyright (c) 2008-2015. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2008-2018. 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 <algorithm>
#include <memory>
#include <utility>
+#include <boost/range/algorithm.hpp>
+
#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 <boost/algorithm/string/predicate.hpp>
+
#include "src/simgrid/util.hpp"
-#include <xbt/log.h>
-#include <xbt/sysdep.h>
+#include "xbt/log.h"
+#include "xbt/string.hpp"
+#include "xbt/sysdep.h"
+#include <simgrid/config.h>
-#include "src/mc/mc_private.h"
#include "src/mc/mc_dwarf.hpp"
+#include "src/mc/mc_private.hpp"
-#include "src/mc/Process.hpp"
#include "src/mc/ObjectInformation.hpp"
#include "src/mc/Variable.hpp"
+#include "src/mc/remote/RemoteClient.hpp"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_dwarf, mc, "DWARF processing");
-/** \brief The default DW_TAG_lower_bound for a given DW_AT_language.
+/** @brief The default DW_TAG_lower_bound for a given DW_AT_language.
*
* The default for a given language is defined in the DWARF spec.
*
- * \param language consant as defined by the DWARf spec
+ * @param language constant as defined by the DWARf spec
*/
static uint64_t MC_dwarf_default_lower_bound(int lang);
-/** \brief Computes the the element_count of a DW_TAG_enumeration_type DIE
+/** @brief Computes the the element_count of a DW_TAG_enumeration_type DIE
*
* This is the number of elements in a given array dimension.
*
* needed because the default lower bound (when there is no DW_AT_lower_bound)
* depends of the language of the compilation unit (DW_AT_language).
*
- * \param die DIE for the DW_TAG_enumeration_type or DW_TAG_subrange_type
- * \param unit DIE of the DW_TAG_compile_unit
+ * @param die DIE for the DW_TAG_enumeration_type or DW_TAG_subrange_type
+ * @param unit DIE of the DW_TAG_compile_unit
*/
-static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die * die,
- Dwarf_Die * unit);
+static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die* die, Dwarf_Die* unit);
-/** \brief Computes the number of elements of a given DW_TAG_array_type.
+/** @brief Computes the number of elements of a given DW_TAG_array_type.
*
- * \param die DIE for the DW_TAG_array_type
+ * @param die DIE for the DW_TAG_array_type
*/
static uint64_t MC_dwarf_array_element_count(Dwarf_Die * die, Dwarf_Die * unit);
-/** \brief Process a DIE
+/** @brief Process a DIE
*
- * \param info the resulting object fot the library/binary file (output)
- * \param die the current DIE
- * \param unit the DIE of the compile unit of the current DIE
- * \param frame containg frame if any
+ * @param info the resulting object fot the library/binary file (output)
+ * @param die the current DIE
+ * @param unit the DIE of the compile unit of the current DIE
+ * @param frame containing frame if any
*/
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
+/** @brief Process a type DIE
*/
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
+/** @brief Calls MC_dwarf_handle_die on all children of the given die
*
- * \param info the resulting object fot the library/binary file (output)
- * \param die the current DIE
- * \param unit the DIE of the compile unit of the current DIE
- * \param frame containg frame if any
+ * @param info the resulting object fot the library/binary file (output)
+ * @param die the current DIE
+ * @param unit the DIE of the compile unit of the current DIE
+ * @param frame containing frame if any
*/
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)
+/** @brief Handle a variable (DW_TAG_variable or other)
*
- * \param info the resulting object fot the library/binary file (output)
- * \param die the current DIE
- * \param unit the DIE of the compile unit of the current DIE
- * \param frame containg frame if any
+ * @param info the resulting object fot the library/binary file (output)
+ * @param die the current DIE
+ * @param unit the DIE of the compile unit of the current DIE
+ * @param frame containing frame if any
*/
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
+/** @brief Get the DW_TAG_type of the DIE
*
- * \param die DIE
- * \return DW_TAG_type attribute as a new string (nullptr if none)
+ * @param die DIE
+ * @return DW_TAG_type attribute as a new string (nullptr if none)
*/
static std::uint64_t MC_dwarf_at_type(Dwarf_Die * die);
}
}
-/** \brief Find the DWARF data class for a given DWARF data form
+/** @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
+ * @param form The form (values taken from the DWARF spec)
+ * @return An internal representation for the corresponding class
* */
static
FormClass classify_form(int form)
}
}
-/** \brief Get the name of the tag of a given DIE
+/** @brief Get the name of the tag of a given DIE
*
- * \param die DIE
- * \return name of the tag of this DIE
+ * @param die DIE
+ * @return name of the tag of this DIE
*/
inline XBT_PRIVATE
const char *tagname(Dwarf_Die * die)
// ***** Attributes
-/** \brief Get an attribute of a given DIE as a string
+/** @brief Get an attribute of a given DIE as a string
*
- * \param die the DIE
- * \param attribute attribute
- * \return value of the given attribute of the given DIE
+ * @param die the DIE
+ * @param attribute attribute
+ * @return value of the given attribute of the given DIE
*/
static const char *MC_dwarf_attr_integrate_string(Dwarf_Die * die,
int attribute)
{
Dwarf_Attribute attr;
- if (!dwarf_attr_integrate(die, attribute, &attr))
+ if (not dwarf_attr_integrate(die, attribute, &attr))
return nullptr;
else
return dwarf_formstring(&attr);
}
-/** \brief Get the linkage name of a DIE.
- *
- * Use either DW_AT_linkage_name or DW_AT_MIPS_linkage_name.
- * DW_AT_linkage_name is standardized since DWARF 4.
- * Before this version of DWARF, the MIPS extensions
- * DW_AT_MIPS_linkage_name is used (at least by GCC).
- *
- * \param the DIE
- * \return linkage name of the given DIE (or nullptr)
- * */
-static const char *MC_dwarf_at_linkage_name(Dwarf_Die * die)
-{
- const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_linkage_name);
- if (!name)
- name = MC_dwarf_attr_integrate_string(die, DW_AT_MIPS_linkage_name);
- return name;
-}
-
static Dwarf_Off MC_dwarf_attr_dieoffset(Dwarf_Die * die, int attribute)
{
Dwarf_Attribute attr;
return dwarf_dieoffset(&subtype_die);
}
-/** \brief Find the type/subtype (DW_AT_type) for a 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 nullptr)
+ * @param die the DIE
+ * @return DW_AT_type reference as a global offset in hexadecimal (or nullptr)
*/
static
std::uint64_t MC_dwarf_at_type(Dwarf_Die * die)
return result;
}
-/** \brief Find the default lower bound for a given language
+/** @brief Find the default lower bound for a given language
*
* The default lower bound of an array (when DW_TAG_lower_bound
* is missing) depends on the language of the compilation unit.
*
- * \param lang Language of the compilation unit (values defined in the DWARF spec)
- * \return Default lower bound of an array in this compilation unit
+ * @param lang Language of the compilation unit (values defined in the DWARF spec)
+ * @return Default lower bound of an array in this compilation unit
* */
static uint64_t MC_dwarf_default_lower_bound(int lang)
{
}
}
-/** \brief Finds the number of elements in a DW_TAG_subrange_type or DW_TAG_enumeration_type DIE
+/** @brief Finds the number of elements in a DW_TAG_subrange_type or DW_TAG_enumeration_type DIE
*
- * \param die the DIE
- * \param unit DIE of the compilation unit
- * \return number of elements in the range
+ * @param die the DIE
+ * @param unit DIE of the compilation unit
+ * @return number of elements in the range
* */
static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die * die,
Dwarf_Die * unit)
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 (not 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 upper_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_upper_bound, static_cast<uint64_t>(-1));
uint64_t lower_bound = 0;
if (dwarf_hasattr_integrate(die, DW_AT_lower_bound))
- lower_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_lower_bound, -1);
+ lower_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_lower_bound, static_cast<uint64_t>(-1));
else
lower_bound = MC_dwarf_default_lower_bound(dwarf_srclang(unit));
return upper_bound - lower_bound + 1;
}
-/** \brief Finds the number of elements in a array type (DW_TAG_array_type)
+/** @brief Finds the number of elements in a array type (DW_TAG_array_type)
*
* The compilation unit might be needed because the default lower
* bound depends on the language of the compilation unit.
*
- * \param die the DIE of the DW_TAG_array_type
- * \param unit the DIE of the compilation unit
- * \return number of elements in this array type
+ * @param die the DIE of the DW_TAG_array_type
+ * @param unit the DIE of the compilation unit
+ * @return number of elements in this array type
* */
static uint64_t MC_dwarf_array_element_count(Dwarf_Die * die, Dwarf_Die * unit)
{
// ***** simgrid::mc::Type*
-/** \brief Initialize the location of a member of a type
+/** @brief Initialize the location of a member of a type
* (DW_AT_data_member_location of a DW_TAG_member).
*
- * \param type a type (struct, class)
- * \param member the member of the type
- * \param child DIE of the member (DW_TAG_member)
+ * @param type a type (struct, class)
+ * @param member the member of the type
+ * @param child DIE of the member (DW_TAG_member)
*/
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))
xbt_die("Can't groke DW_AT_data_bit_offset.");
- if (!dwarf_hasattr_integrate(child, DW_AT_data_member_location)) {
+ if (not dwarf_hasattr_integrate(child, DW_AT_data_member_location)) {
if (type->type == DW_TAG_union_type)
return;
xbt_die
// Offset from the base address of the object:
{
Dwarf_Word offset;
- if (!dwarf_formudata(&attr, &offset))
+ if (not dwarf_formudata(&attr, &offset))
member->offset(offset);
else
xbt_die("Cannot get %s location <%" PRIx64 ">%s",
(uint64_t) type->id, type->name.c_str());
break;
}
- case simgrid::dwarf::FormClass::LocListPtr:
- // Reference to a location list:
- // TODO
- 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",
- (int) form_class, form);
+ // includes FormClass::LocListPtr (reference to a location list: TODO) and FormClass::Reference (it's supposed to be
+ // possible in DWARF2 but I couldn't find its semantic in the spec)
+ xbt_die("Can't handle form class (%d) / form 0x%x as DW_AT_member_location", (int)form_class, (unsigned)form);
}
}
-/** \brief Populate the list of members of a type
+/** @brief Populate the list of members of a type
*
- * \param info ELF object containing the type DIE
- * \param die DIE of the type
- * \param unit DIE of the compilation unit containing the type DIE
- * \param type the type
+ * @param info ELF object containing the type DIE
+ * @param die DIE of the type
+ * @param unit DIE of the compilation unit containing the type DIE
+ * @param type the type
*/
-static void MC_dwarf_add_members(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Type* 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;
// TODO, we should use another type (because is is not a type but a member)
simgrid::mc::Member member;
- member.inheritance = tag == DW_TAG_inheritance;
+ if (tag == DW_TAG_inheritance)
+ member.flags |= simgrid::mc::Member::INHERITANCE_FLAG;
const char *name = MC_dwarf_attr_integrate_string(&child, DW_AT_name);
if (name)
member.name = name;
+ // Those base names are used by GCC and clang for virtual table pointers
+ // respectively ("__vptr$ClassName", "__vptr.ClassName"):
+ if (boost::algorithm::starts_with(member.name, "__vptr$") ||
+ boost::algorithm::starts_with(member.name, "__vptr."))
+ member.flags |= simgrid::mc::Member::VIRTUAL_POINTER_FLAG;
+ // A cleaner solution would be to check against the type:
+ // ---
+ // tag: DW_TAG_member
+ // name: "_vptr$Foo"
+ // type:
+ // # Type for a pointer to a vtable
+ // tag: DW_TAG_pointer_type
+ // type:
+ // # Type for a vtable:
+ // tag: DW_TAG_pointer_type
+ // name: "__vtbl_ptr_type"
+ // type:
+ // tag: DW_TAG_subroutine_type
+ // type:
+ // tag: DW_TAG_base_type
+ // name: "int"
+ // ---
+
member.byte_size =
MC_dwarf_attr_integrate_uint(&child, DW_AT_byte_size, 0);
member.type_id = MC_dwarf_at_type(&child);
MC_dwarf_fill_member_location(type, &member, &child);
- if (!member.type_id)
+ if (not 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());
}
}
-/** \brief Create a MC type object from a DIE
+/** @brief Create a MC type object from a DIE
*
- * \param info current object info object
- * \param DIE (for a given type);
- * \param unit compilation unit of the current DIE
- * \return MC representation of the type
+ * @param info current object info object
+ * @param die DIE (for a given type)
+ * @param unit compilation unit of the current DIE
+ * @return MC representation of the type
*/
static simgrid::mc::Type MC_dwarf_die_to_type(
simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_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);
+ if (ns)
+ type.name = simgrid::xbt::string_printf("%s%s::%s", prefix, ns, name);
+ else
+ type.name = simgrid::xbt::string_printf("%s%s", prefix, name);
}
type.type_id = MC_dwarf_at_type(die);
if (type.type == DW_TAG_pointer_type)
type.byte_size = sizeof(void*);
- // Computation of the byte_size;
+ // 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
case DW_TAG_union_type:
case DW_TAG_class_type:
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);
+ MC_dwarf_handle_children(info, die, unit, frame,
+ ns ? simgrid::xbt::string_printf("%s::%s", ns, name).c_str() : type.name.c_str());
+ break;
+
+ default:
+ XBT_DEBUG("Unhandled type: %d (%s)", type.type, simgrid::dwarf::tagname(type.type));
break;
}
{
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)
+ if (not t.name.empty() && type.byte_size != 0)
info->full_types_by_name[t.name] = &t;
}
static int mc_anonymous_variable_index = 0;
-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)
+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))
variable->address = (void *) (base + offset);
} else
variable->location_list = {
- simgrid::dwarf::DwarfExpression(expr, expr + len) };
+ simgrid::dwarf::LocationListEntry(simgrid::dwarf::DwarfExpression(expr, expr + len))};
break;
}
break;
default:
- 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->id,
- variable->name.c_str());
+ xbt_die("Unexpected form 0x%x (%i), class 0x%x (%i) list for location in <%" PRIx64 ">%s", (unsigned)form, form,
+ (unsigned)form_class, (int)form_class, (uint64_t)variable->id, variable->name.c_str());
}
// Handle start_scope:
dwarf_attr(die, DW_AT_start_scope, &attr);
int form = dwarf_whatform(&attr);
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 simgrid::dwarf::FormClass::RangeListPtr: // TODO
- default:
- xbt_die
- ("Unhandled form 0x%x, class 0x%X for DW_AT_start_scope of variable %s",
- form, (int) form_class, name == nullptr ? "?" : name);
+ if (form_class == simgrid::dwarf::FormClass::Constant) {
+ Dwarf_Word value;
+ variable->start_scope = dwarf_formudata(&attr, &value) == 0 ? (size_t)value : 0;
+ } else {
+ // TODO: FormClass::RangeListPtr
+ xbt_die("Unhandled form 0x%x, class 0x%X for DW_AT_start_scope of variable %s", (unsigned)form,
+ (unsigned)form_class, name == nullptr ? "?" : name);
}
}
// The current code needs a variable name,
// generate a fake one:
- if (variable->name.empty())
- variable->name =
- "@anonymous#" + std::to_string(mc_anonymous_variable_index++);
-
+ if (variable->name.empty()) {
+ variable->name = "@anonymous#" + std::to_string(mc_anonymous_variable_index);
+ mc_anonymous_variable_index++;
+ }
return variable;
}
{
std::unique_ptr<simgrid::mc::Variable> variable =
MC_die_to_variable(info, die, unit, frame, ns);
- if (!variable)
+ if (not variable)
return;
// Those arrays are sorted later:
- else if (variable->global)
+ if (variable->global)
info->global_variables.push_back(std::move(*variable));
else if (frame != nullptr)
frame->variables.push_back(std::move(*variable));
if (klass == simgrid::dwarf::TagClass::Subprogram) {
const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
- if (ns)
+ if (name && ns)
frame.name = std::string(ns) + "::" + name;
else if (name)
frame.name = name;
if (low_pc) {
// DW_AT_high_pc:
Dwarf_Attribute attr;
- if (!dwarf_attr_integrate(die, DW_AT_high_pc, &attr))
+ if (not 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;
case simgrid::dwarf::FormClass::Address:
if (dwarf_formaddr(&attr, &high_pc) != 0)
xbt_die("Could not read address");
- frame.range.begin() = base + high_pc;
+ frame.range.end() = base + high_pc;
break;
default:
// We sort them in order to have an (somewhat) efficient by name
// lookup:
- std::sort(frame.variables.begin(), frame.variables.end(),
- MC_compare_variable);
+ boost::range::sort(frame.variables, MC_compare_variable);
// Register it:
if (klass == simgrid::dwarf::TagClass::Subprogram)
Dwarf_Off next_offset = 0;
size_t length;
- while (dwarf_nextcu(dwarf, offset, &next_offset, &length, nullptr, NULL, NULL) ==
+ while (dwarf_nextcu(dwarf, offset, &next_offset, &length, nullptr, nullptr, nullptr) ==
0) {
Dwarf_Die unit_die;
if (dwarf_offdie(dwarf, offset + length, &unit_die) != nullptr)
- MC_dwarf_handle_children(info, &unit_die, &unit_die, nullptr, NULL);
+ MC_dwarf_handle_children(info, &unit_die, &unit_die, nullptr, nullptr);
offset = next_offset;
}
}
static
std::vector<char> get_build_id(Elf* elf)
{
+#ifdef __linux
+ // Summary: the GNU build ID is stored in a ("GNU, NT_GNU_BUILD_ID) note
+ // found in a PT_NOTE entry in the program header table.
+
size_t phnum;
if (elf_getphdrnum (elf, &phnum) != 0)
xbt_die("Could not read program headers");
// Iterate over the notes and find the NT_GNU_BUILD_ID one:
size_t pos = 0;
- while (1) {
+ while (pos < data->d_size) {
GElf_Nhdr nhdr;
+ // Location of the name within Elf_Data:
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):
+ // A build ID note is identified by the pair ("GNU", NT_GNU_BUILD_ID)
+ // (a namespace and a type within this namespace):
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:
+ XBT_DEBUG("Found GNU/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);
-
}
}
}
+#endif
return std::vector<char>();
}
* This is one of the mechanisms used for
* [separate debug files](https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html).
*/
+// Example:
+// /usr/lib/debug/.build-id/0b/dc77f1c29aea2b14ff5acd9a19ab3175ffdeae.debug
static
std::string find_by_build_id(std::vector<char> id)
{
std::string filename;
- for (const char* debug_path : debug_paths) {
- filename = debug_path;
- filename += ".build-id/" + to_hex(id.data(), 1) + '/'
+ std::string hex = to_hex(id);
+ for (const char* const& debug_path : debug_paths) {
+ // Example:
+ filename = std::string(debug_path) + ".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)
+ if (access(filename.c_str(), F_OK) == 0) {
+ XBT_DEBUG("Found debug file: %s\n", hex.c_str());
return filename;
+ }
}
+ XBT_DEBUG("Not debuf info found for build ID %s\n", hex.data());
return std::string();
}
-/** \brief Populate the debugging informations of the given ELF object
+/** @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.
*/
static
-void MC_dwarf_get_variables(simgrid::mc::ObjectInformation* info)
+void MC_load_dwarf(simgrid::mc::ObjectInformation* info)
{
if (elf_version(EV_CURRENT) == EV_NONE)
xbt_die("libelf initialization error");
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");
+ xbt_die("Not an ELF file");
Elf_Kind kind = elf_kind(elf);
if (kind != ELF_K_ELF)
- xbt_die("Not an ELF file 2");
+ xbt_die("Not an ELF file");
- // Remember if this is a `ET_EXEC` (fixed location) or `ET_DYN` (relocatable):
+ // Remember if this is a `ET_EXEC` (fixed location) or `ET_DYN`:
Elf64_Half type = get_type(elf);
if (type == ET_EXEC)
info->flags |= simgrid::mc::ObjectInformation::Executable;
}
dwarf_end(dwarf);
- // If there was no DWARF in the file, try to find it in a separate file
- // with NT_GNU_BUILD_ID:
+ // If there was no DWARF in the file, try to find it in a separate file.
+ // Different methods might be used to store the DWARF informations:
+ // * GNU NT_GNU_BUILD_ID
+ // * .gnu_debuglink
+ // See https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html
+ // for reference of what we are doing.
+
+ // Try with NT_GNU_BUILD_ID: we find the build ID in the ELF file and then
+ // use this ID to find the file in some known locations in the filesystem.
std::vector<char> build_id = get_build_id(elf);
- if (!build_id.empty()) {
+ if (not build_id.empty()) {
elf_end(elf);
close(fd);
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"
+ 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());
}
return;
}
- // TODO, try to find DWARF info using debug-link.
- // Is this method really used anywhere?
+ // TODO, try to find DWARF info using .gnu_debuglink.
+ elf_end(elf);
+ close(fd);
xbt_die("Debugging information not found for %s\n"
- "Try recompiling with -g\n",
- info->file_name.c_str());
+ "Try recompiling with -g\n",
+ info->file_name.c_str());
}
// ***** Functions index
-static int MC_compare_frame_index_items(simgrid::mc::FunctionIndexEntry* a,
- simgrid::mc::FunctionIndexEntry* b)
-{
- if (a->low_pc < b->low_pc)
- return -1;
- else if (a->low_pc == b->low_pc)
- return 0;
- else
- return 1;
-}
-
static void MC_make_functions_index(simgrid::mc::ObjectInformation* info)
{
info->functions_index.clear();
info->functions_index.shrink_to_fit();
// Sort the array by low_pc:
- std::sort(info->functions_index.begin(), info->functions_index.end(),
+ boost::range::sort(info->functions_index,
[](simgrid::mc::FunctionIndexEntry const& a,
simgrid::mc::FunctionIndexEntry const& b)
{
static void MC_post_process_variables(simgrid::mc::ObjectInformation* info)
{
// Someone needs this to be sorted but who?
- std::sort(info->global_variables.begin(), info->global_variables.end(),
- MC_compare_variable);
+ boost::range::sort(info->global_variables, MC_compare_variable);
- for(simgrid::mc::Variable& variable : info->global_variables)
+ for (simgrid::mc::Variable& variable : info->global_variables)
if (variable.type_id)
variable.type = simgrid::util::find_map_ptr(
info->types, variable.type_id);
// Recursive post-processing of nested-scopes:
for (simgrid::mc::Frame& nested_scope : scope->scopes)
- mc_post_process_scope(info, &nested_scope);
-
+ mc_post_process_scope(info, &nested_scope);
}
static
simgrid::mc::Type* MC_resolve_type(
simgrid::mc::ObjectInformation* info, unsigned type_id)
{
- if (!type_id)
+ if (not type_id)
return nullptr;
simgrid::mc::Type* type = simgrid::util::find_map_ptr(info->types, type_id);
if (type == nullptr)
static void MC_post_process_types(simgrid::mc::ObjectInformation* info)
{
// Lookup "subtype" field:
- for(auto& i : info->types) {
+ 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 */
+/** @brief Finds informations about a given shared object/executable */
std::shared_ptr<simgrid::mc::ObjectInformation> createObjectInformation(
std::vector<simgrid::xbt::VmMap> const& maps, const char *name)
{
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_load_dwarf(result.get());
MC_post_process_variables(result.get());
MC_post_process_types(result.get());
for (auto& entry : result.get()->subprograms)
/*************************************************************************/
-void postProcessObjectInformation(simgrid::mc::Process* process, simgrid::mc::ObjectInformation* info)
+void postProcessObjectInformation(simgrid::mc::RemoteClient* process, simgrid::mc::ObjectInformation* info)
{
for (auto& i : info->types) {
break;
// Resolve full_type:
- if (!subtype->name.empty() && subtype->byte_size == 0)
+ if (not subtype->name.empty() && subtype->byte_size == 0)
for (auto const& object_info : process->object_infos) {
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) {
+ if (i != object_info->full_types_by_name.end() && not i->second->name.empty() && i->second->byte_size) {
type->full_type = i->second;
break;
}
*
* DWARF and libunwind does not use the same convention for numbering the
* registers on some architectures. The function makes the necessary
- * convertion.
+ * conversion.
*/
int dwarf_register_to_libunwind(int dwarf_register)
{
// 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.
+ // Couldn'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:
