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// mapfile.cc -- map file generation for gold
// Copyright (C) 2008-2021 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
#include "gold.h"
#include <cerrno>
#include <cstdio>
#include <cstring>
#include "archive.h"
#include "symtab.h"
#include "output.h"
#include "mapfile.h"
// This file holds the code for printing information to the map file.
// In general we try to produce pretty much the same format as GNU ld.
namespace gold
{
// Mapfile constructor.
Mapfile::Mapfile()
: map_file_(NULL),
printed_archive_header_(false),
printed_common_header_(false),
printed_memory_map_header_(false)
{
}
// Mapfile destructor.
Mapfile::~Mapfile()
{
if (this->map_file_ != NULL)
this->close();
}
// Open the map file.
bool
Mapfile::open(const char* map_filename)
{
if (strcmp(map_filename, "-") == 0)
this->map_file_ = stdout;
else
{
this->map_file_ = ::fopen(map_filename, "w");
if (this->map_file_ == NULL)
{
gold_error(_("cannot open map file %s: %s"), map_filename,
strerror(errno));
return false;
}
}
return true;
}
// Close the map file.
void
Mapfile::close()
{
if (fclose(this->map_file_) != 0)
gold_error(_("cannot close map file: %s"), strerror(errno));
this->map_file_ = NULL;
}
// Advance to a column.
void
Mapfile::advance_to_column(size_t from, size_t to)
{
if (from >= to - 1)
{
putc('\n', this->map_file_);
from = 0;
}
while (from < to)
{
putc(' ', this->map_file_);
++from;
}
}
// Report about including a member from an archive.
void
Mapfile::report_include_archive_member(const std::string& member_name,
const Symbol* sym, const char* why)
{
// We print a header before the list of archive members, mainly for
// GNU ld compatibility.
if (!this->printed_archive_header_)
{
fprintf(this->map_file_,
_("Archive member included because of file (symbol)\n\n"));
this->printed_archive_header_ = true;
}
fprintf(this->map_file_, "%s", member_name.c_str());
this->advance_to_column(member_name.length(), 30);
if (sym == NULL)
fprintf(this->map_file_, "%s", why);
else
{
switch (sym->source())
{
case Symbol::FROM_OBJECT:
fprintf(this->map_file_, "%s", sym->object()->name().c_str());
break;
case Symbol::IS_UNDEFINED:
fprintf(this->map_file_, "-u");
break;
default:
case Symbol::IN_OUTPUT_DATA:
case Symbol::IN_OUTPUT_SEGMENT:
case Symbol::IS_CONSTANT:
// We should only see an undefined symbol here.
gold_unreachable();
}
fprintf(this->map_file_, " (%s)", sym->name());
}
putc('\n', this->map_file_);
}
// Report allocating a common symbol.
void
Mapfile::report_allocate_common(const Symbol* sym, uint64_t symsize)
{
if (!this->printed_common_header_)
{
fprintf(this->map_file_, _("\nAllocating common symbols\n"));
fprintf(this->map_file_,
_("Common symbol size file\n\n"));
this->printed_common_header_ = true;
}
std::string demangled_name = sym->demangled_name();
fprintf(this->map_file_, "%s", demangled_name.c_str());
this->advance_to_column(demangled_name.length(), 20);
char buf[50];
snprintf(buf, sizeof buf, "0x%llx", static_cast<unsigned long long>(symsize));
fprintf(this->map_file_, "%s", buf);
size_t len = strlen(buf);
while (len < 18)
{
putc(' ', this->map_file_);
++len;
}
fprintf(this->map_file_, "%s\n", sym->object()->name().c_str());
}
// The space we make for a section name.
const size_t Mapfile::section_name_map_length = 16;
// Print the memory map header if necessary.
void
Mapfile::print_memory_map_header()
{
if (!this->printed_memory_map_header_)
{
fprintf(this->map_file_, _("\nMemory map\n\n"));
this->printed_memory_map_header_ = true;
}
}
// Print the symbols associated with an input section.
template<int size, bool big_endian>
void
Mapfile::print_input_section_symbols(
const Sized_relobj_file<size, big_endian>* relobj,
unsigned int shndx)
{
unsigned int symcount = relobj->symbol_count();
for (unsigned int i = relobj->local_symbol_count(); i < symcount; ++i)
{
const Symbol* sym = relobj->global_symbol(i);
bool is_ordinary;
if (sym != NULL
&& sym->source() == Symbol::FROM_OBJECT
&& sym->object() == relobj
&& sym->shndx(&is_ordinary) == shndx
&& is_ordinary
&& sym->is_defined())
{
for (size_t i = 0; i < Mapfile::section_name_map_length; ++i)
putc(' ', this->map_file_);
const Sized_symbol<size>* ssym =
static_cast<const Sized_symbol<size>*>(sym);
fprintf(this->map_file_,
"0x%0*llx %s\n",
size / 4,
static_cast<unsigned long long>(ssym->value()),
sym->demangled_name().c_str());
}
}
}
// Print an input section.
void
Mapfile::print_input_section(Relobj* relobj, unsigned int shndx)
{
putc(' ', this->map_file_);
std::string name = relobj->section_name(shndx);
fprintf(this->map_file_, "%s", name.c_str());
this->advance_to_column(name.length() + 1, Mapfile::section_name_map_length);
Output_section* os;
uint64_t addr;
if (!relobj->is_section_included(shndx))
{
os = NULL;
addr = 0;
}
else
{
os = relobj->output_section(shndx);
addr = relobj->output_section_offset(shndx);
if (addr != -1ULL)
addr += os->address();
}
char sizebuf[50];
section_size_type size;
if (!relobj->section_is_compressed(shndx, &size))
size = relobj->section_size(shndx);
snprintf(sizebuf, sizeof sizebuf, "0x%llx",
static_cast<unsigned long long>(size));
fprintf(this->map_file_, "0x%0*llx %10s %s\n",
parameters->target().get_size() / 4,
static_cast<unsigned long long>(addr), sizebuf,
relobj->name().c_str());
if (os != NULL)
{
switch (parameters->size_and_endianness())
{
#ifdef HAVE_TARGET_32_LITTLE
case Parameters::TARGET_32_LITTLE:
{
const Sized_relobj_file<32, false>* sized_relobj =
static_cast<Sized_relobj_file<32, false>*>(relobj);
this->print_input_section_symbols(sized_relobj, shndx);
}
break;
#endif
#ifdef HAVE_TARGET_32_BIG
case Parameters::TARGET_32_BIG:
{
const Sized_relobj_file<32, true>* sized_relobj =
static_cast<Sized_relobj_file<32, true>*>(relobj);
this->print_input_section_symbols(sized_relobj, shndx);
}
break;
#endif
#ifdef HAVE_TARGET_64_LITTLE
case Parameters::TARGET_64_LITTLE:
{
const Sized_relobj_file<64, false>* sized_relobj =
static_cast<Sized_relobj_file<64, false>*>(relobj);
this->print_input_section_symbols(sized_relobj, shndx);
}
break;
#endif
#ifdef HAVE_TARGET_64_BIG
case Parameters::TARGET_64_BIG:
{
const Sized_relobj_file<64, true>* sized_relobj =
static_cast<Sized_relobj_file<64, true>*>(relobj);
this->print_input_section_symbols(sized_relobj, shndx);
}
break;
#endif
default:
gold_unreachable();
}
}
}
// Print an Output_section_data. This is printed to look like an
// input section.
void
Mapfile::print_output_data(const Output_data* od, const char* name)
{
this->print_memory_map_header();
putc(' ', this->map_file_);
fprintf(this->map_file_, "%s", name);
this->advance_to_column(strlen(name) + 1, Mapfile::section_name_map_length);
char sizebuf[50];
snprintf(sizebuf, sizeof sizebuf, "0x%llx",
static_cast<unsigned long long>(od->current_data_size()));
fprintf(this->map_file_, "0x%0*llx %10s\n",
parameters->target().get_size() / 4,
(od->is_address_valid()
? static_cast<unsigned long long>(od->address())
: 0),
sizebuf);
}
// Print the discarded input sections.
void
Mapfile::print_discarded_sections(const Input_objects* input_objects)
{
bool printed_header = false;
for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
p != input_objects->relobj_end();
++p)
{
Relobj* relobj = *p;
// Lock the object so we can read from it. This is only called
// single-threaded from Layout_task_runner, so it is OK to lock.
// Unfortunately we have no way to pass in a Task token.
const Task* dummy_task = reinterpret_cast<const Task*>(-1);
Task_lock_obj<Object> tl(dummy_task, relobj);
unsigned int shnum = relobj->shnum();
for (unsigned int i = 0; i < shnum; ++i)
{
unsigned int sh_type = relobj->section_type(i);
if ((sh_type == elfcpp::SHT_PROGBITS
|| sh_type == elfcpp::SHT_NOBITS
|| sh_type == elfcpp::SHT_GROUP)
&& !relobj->is_section_included(i))
{
if (!printed_header)
{
fprintf(this->map_file_, _("\nDiscarded input sections\n\n"));
printed_header = true;
}
this->print_input_section(relobj, i);
}
}
}
}
// Print an output section.
void
Mapfile::print_output_section(const Output_section* os)
{
this->print_memory_map_header();
fprintf(this->map_file_, "\n%s", os->name());
this->advance_to_column(strlen(os->name()), Mapfile::section_name_map_length);
char sizebuf[50];
snprintf(sizebuf, sizeof sizebuf, "0x%llx",
static_cast<unsigned long long>(os->current_data_size()));
fprintf(this->map_file_, "0x%0*llx %10s",
parameters->target().get_size() / 4,
static_cast<unsigned long long>(os->address()), sizebuf);
if (os->has_load_address())
fprintf(this->map_file_, " load address 0x%-*llx",
parameters->target().get_size() / 4,
static_cast<unsigned long long>(os->load_address()));
if (os->requires_postprocessing())
fprintf(this->map_file_, " (before compression)");
putc('\n', this->map_file_);
}
} // End namespace gold.