// object.cc -- support for an object file for linking in gold
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include <cerrno>
#include <cstring>
#include <cstdarg>
+#include "demangle.h"
+#include "libiberty.h"
+#include "gc.h"
#include "target-select.h"
#include "dwarf_reader.h"
#include "layout.h"
#include "output.h"
#include "symtab.h"
+#include "cref.h"
#include "reloc.h"
#include "object.h"
#include "dynobj.h"
+#include "plugin.h"
+#include "compressed_output.h"
+#include "incremental.h"
+#include "merge.h"
namespace gold
{
-// Class Object.
+// Struct Read_symbols_data.
+
+// Destroy any remaining File_view objects and buffers of decompressed
+// sections.
+
+Read_symbols_data::~Read_symbols_data()
+{
+ if (this->section_headers != NULL)
+ delete this->section_headers;
+ if (this->section_names != NULL)
+ delete this->section_names;
+ if (this->symbols != NULL)
+ delete this->symbols;
+ if (this->symbol_names != NULL)
+ delete this->symbol_names;
+ if (this->versym != NULL)
+ delete this->versym;
+ if (this->verdef != NULL)
+ delete this->verdef;
+ if (this->verneed != NULL)
+ delete this->verneed;
+}
+
+// Class Xindex.
-// Set the target based on fields in the ELF file header.
+// Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX
+// section and read it in. SYMTAB_SHNDX is the index of the symbol
+// table we care about.
+template<int size, bool big_endian>
void
-Object::set_target(int machine, int size, bool big_endian, int osabi,
- int abiversion)
+Xindex::initialize_symtab_xindex(Object* object, unsigned int symtab_shndx)
{
- Target* target = select_target(machine, size, big_endian, osabi, abiversion);
- if (target == NULL)
- gold_fatal(_("%s: unsupported ELF machine number %d"),
- this->name().c_str(), machine);
- this->target_ = target;
+ if (!this->symtab_xindex_.empty())
+ return;
+
+ gold_assert(symtab_shndx != 0);
+
+ // Look through the sections in reverse order, on the theory that it
+ // is more likely to be near the end than the beginning.
+ unsigned int i = object->shnum();
+ while (i > 0)
+ {
+ --i;
+ if (object->section_type(i) == elfcpp::SHT_SYMTAB_SHNDX
+ && this->adjust_shndx(object->section_link(i)) == symtab_shndx)
+ {
+ this->read_symtab_xindex<size, big_endian>(object, i, NULL);
+ return;
+ }
+ }
+
+ object->error(_("missing SHT_SYMTAB_SHNDX section"));
+}
+
+// Read in the symtab_xindex_ array, given the section index of the
+// SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the
+// section headers.
+
+template<int size, bool big_endian>
+void
+Xindex::read_symtab_xindex(Object* object, unsigned int xindex_shndx,
+ const unsigned char* pshdrs)
+{
+ section_size_type bytecount;
+ const unsigned char* contents;
+ if (pshdrs == NULL)
+ contents = object->section_contents(xindex_shndx, &bytecount, false);
+ else
+ {
+ const unsigned char* p = (pshdrs
+ + (xindex_shndx
+ * elfcpp::Elf_sizes<size>::shdr_size));
+ typename elfcpp::Shdr<size, big_endian> shdr(p);
+ bytecount = convert_to_section_size_type(shdr.get_sh_size());
+ contents = object->get_view(shdr.get_sh_offset(), bytecount, true, false);
+ }
+
+ gold_assert(this->symtab_xindex_.empty());
+ this->symtab_xindex_.reserve(bytecount / 4);
+ for (section_size_type i = 0; i < bytecount; i += 4)
+ {
+ unsigned int shndx = elfcpp::Swap<32, big_endian>::readval(contents + i);
+ // We preadjust the section indexes we save.
+ this->symtab_xindex_.push_back(this->adjust_shndx(shndx));
+ }
+}
+
+// Symbol symndx has a section of SHN_XINDEX; return the real section
+// index.
+
+unsigned int
+Xindex::sym_xindex_to_shndx(Object* object, unsigned int symndx)
+{
+ if (symndx >= this->symtab_xindex_.size())
+ {
+ object->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"),
+ symndx);
+ return elfcpp::SHN_UNDEF;
+ }
+ unsigned int shndx = this->symtab_xindex_[symndx];
+ if (shndx < elfcpp::SHN_LORESERVE || shndx >= object->shnum())
+ {
+ object->error(_("extended index for symbol %u out of range: %u"),
+ symndx, shndx);
+ return elfcpp::SHN_UNDEF;
+ }
+ return shndx;
}
+// Class Object.
+
// Report an error for this object file. This is used by the
// elfcpp::Elf_file interface, and also called by the Object code
// itself.
// Return a view of the contents of a section.
const unsigned char*
-Object::section_contents(unsigned int shndx, off_t* plen, bool cache)
-{
- Location loc(this->do_section_contents(shndx));
- *plen = loc.data_size;
- return this->get_view(loc.file_offset, loc.data_size, cache);
-}
+Object::section_contents(unsigned int shndx, section_size_type* plen,
+ bool cache)
+{ return this->do_section_contents(shndx, plen, cache); }
-// Read the section data into SD. This is code common to Sized_relobj
+// Read the section data into SD. This is code common to Sized_relobj_file
// and Sized_dynobj, so we put it into Object.
template<int size, bool big_endian>
// Read the section headers.
const off_t shoff = elf_file->shoff();
const unsigned int shnum = this->shnum();
- sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size, true);
+ sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size,
+ true, true);
// Read the section names.
const unsigned char* pshdrs = sd->section_headers->data();
this->error(_("section name section has wrong type: %u"),
static_cast<unsigned int>(shdrnames.get_sh_type()));
- sd->section_names_size = shdrnames.get_sh_size();
+ sd->section_names_size =
+ convert_to_section_size_type(shdrnames.get_sh_size());
sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(),
- sd->section_names_size, false);
+ sd->section_names_size, false,
+ false);
}
// If NAME is the name of a special .gnu.warning section, arrange for
const int warn_prefix_len = sizeof warn_prefix - 1;
if (strncmp(name, warn_prefix, warn_prefix_len) == 0)
{
- symtab->add_warning(name + warn_prefix_len, this, shndx);
+ // Read the section contents to get the warning text. It would
+ // be nicer if we only did this if we have to actually issue a
+ // warning. Unfortunately, warnings are issued as we relocate
+ // sections. That means that we can not lock the object then,
+ // as we might try to issue the same warning multiple times
+ // simultaneously.
+ section_size_type len;
+ const unsigned char* contents = this->section_contents(shndx, &len,
+ false);
+ if (len == 0)
+ {
+ const char* warning = name + warn_prefix_len;
+ contents = reinterpret_cast<const unsigned char*>(warning);
+ len = strlen(warning);
+ }
+ std::string warning(reinterpret_cast<const char*>(contents), len);
+ symtab->add_warning(name + warn_prefix_len, this, warning);
+ return true;
+ }
+ return false;
+}
+
+// If NAME is the name of the special section which indicates that
+// this object was compiled with -fsplit-stack, mark it accordingly.
+
+bool
+Object::handle_split_stack_section(const char* name)
+{
+ if (strcmp(name, ".note.GNU-split-stack") == 0)
+ {
+ this->uses_split_stack_ = true;
+ return true;
+ }
+ if (strcmp(name, ".note.GNU-no-split-stack") == 0)
+ {
+ this->has_no_split_stack_ = true;
+ return true;
+ }
+ return false;
+}
+
+// Class Relobj
+
+template<int size>
+void
+Relobj::initialize_input_to_output_map(unsigned int shndx,
+ typename elfcpp::Elf_types<size>::Elf_Addr starting_address,
+ Unordered_map<section_offset_type,
+ typename elfcpp::Elf_types<size>::Elf_Addr>* output_addresses) const {
+ Object_merge_map *map = this->object_merge_map_;
+ map->initialize_input_to_output_map<size>(shndx, starting_address,
+ output_addresses);
+}
+
+void
+Relobj::add_merge_mapping(Output_section_data *output_data,
+ unsigned int shndx, section_offset_type offset,
+ section_size_type length,
+ section_offset_type output_offset) {
+ Object_merge_map* object_merge_map = this->get_or_create_merge_map();
+ object_merge_map->add_mapping(output_data, shndx, offset, length, output_offset);
+}
+
+bool
+Relobj::merge_output_offset(unsigned int shndx, section_offset_type offset,
+ section_offset_type *poutput) const {
+ Object_merge_map* object_merge_map = this->object_merge_map_;
+ if (object_merge_map == NULL)
+ return false;
+ return object_merge_map->get_output_offset(shndx, offset, poutput);
+}
+
+const Output_section_data*
+Relobj::find_merge_section(unsigned int shndx) const {
+ Object_merge_map* object_merge_map = this->object_merge_map_;
+ if (object_merge_map == NULL)
+ return NULL;
+ return object_merge_map->find_merge_section(shndx);
+}
+
+// To copy the symbols data read from the file to a local data structure.
+// This function is called from do_layout only while doing garbage
+// collection.
+
+void
+Relobj::copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd,
+ unsigned int section_header_size)
+{
+ gc_sd->section_headers_data =
+ new unsigned char[(section_header_size)];
+ memcpy(gc_sd->section_headers_data, sd->section_headers->data(),
+ section_header_size);
+ gc_sd->section_names_data =
+ new unsigned char[sd->section_names_size];
+ memcpy(gc_sd->section_names_data, sd->section_names->data(),
+ sd->section_names_size);
+ gc_sd->section_names_size = sd->section_names_size;
+ if (sd->symbols != NULL)
+ {
+ gc_sd->symbols_data =
+ new unsigned char[sd->symbols_size];
+ memcpy(gc_sd->symbols_data, sd->symbols->data(),
+ sd->symbols_size);
+ }
+ else
+ {
+ gc_sd->symbols_data = NULL;
+ }
+ gc_sd->symbols_size = sd->symbols_size;
+ gc_sd->external_symbols_offset = sd->external_symbols_offset;
+ if (sd->symbol_names != NULL)
+ {
+ gc_sd->symbol_names_data =
+ new unsigned char[sd->symbol_names_size];
+ memcpy(gc_sd->symbol_names_data, sd->symbol_names->data(),
+ sd->symbol_names_size);
+ }
+ else
+ {
+ gc_sd->symbol_names_data = NULL;
+ }
+ gc_sd->symbol_names_size = sd->symbol_names_size;
+}
+
+// This function determines if a particular section name must be included
+// in the link. This is used during garbage collection to determine the
+// roots of the worklist.
+
+bool
+Relobj::is_section_name_included(const char* name)
+{
+ if (is_prefix_of(".ctors", name)
+ || is_prefix_of(".dtors", name)
+ || is_prefix_of(".note", name)
+ || is_prefix_of(".init", name)
+ || is_prefix_of(".fini", name)
+ || is_prefix_of(".gcc_except_table", name)
+ || is_prefix_of(".jcr", name)
+ || is_prefix_of(".preinit_array", name)
+ || (is_prefix_of(".text", name)
+ && strstr(name, "personality"))
+ || (is_prefix_of(".data", name)
+ && strstr(name, "personality"))
+ || (is_prefix_of(".sdata", name)
+ && strstr(name, "personality"))
+ || (is_prefix_of(".gnu.linkonce.d", name)
+ && strstr(name, "personality"))
+ || (is_prefix_of(".rodata", name)
+ && strstr(name, "nptl_version")))
+ {
return true;
}
return false;
}
+// Finalize the incremental relocation information. Allocates a block
+// of relocation entries for each symbol, and sets the reloc_bases_
+// array to point to the first entry in each block. If CLEAR_COUNTS
+// is TRUE, also clear the per-symbol relocation counters.
+
+void
+Relobj::finalize_incremental_relocs(Layout* layout, bool clear_counts)
+{
+ unsigned int nsyms = this->get_global_symbols()->size();
+ this->reloc_bases_ = new unsigned int[nsyms];
+
+ gold_assert(this->reloc_bases_ != NULL);
+ gold_assert(layout->incremental_inputs() != NULL);
+
+ unsigned int rindex = layout->incremental_inputs()->get_reloc_count();
+ for (unsigned int i = 0; i < nsyms; ++i)
+ {
+ this->reloc_bases_[i] = rindex;
+ rindex += this->reloc_counts_[i];
+ if (clear_counts)
+ this->reloc_counts_[i] = 0;
+ }
+ layout->incremental_inputs()->set_reloc_count(rindex);
+}
+
+Object_merge_map*
+Relobj::get_or_create_merge_map()
+{
+ if (!this->object_merge_map_)
+ this->object_merge_map_ = new Object_merge_map();
+ return this->object_merge_map_;
+}
+
// Class Sized_relobj.
+// Iterate over local symbols, calling a visitor class V for each GOT offset
+// associated with a local symbol.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::do_for_all_local_got_entries(
+ Got_offset_list::Visitor* v) const
+{
+ unsigned int nsyms = this->local_symbol_count();
+ for (unsigned int i = 0; i < nsyms; i++)
+ {
+ Local_got_entry_key key(i, 0);
+ Local_got_offsets::const_iterator p = this->local_got_offsets_.find(key);
+ if (p != this->local_got_offsets_.end())
+ {
+ const Got_offset_list* got_offsets = p->second;
+ got_offsets->for_all_got_offsets(v);
+ }
+ }
+}
+
+// Get the address of an output section.
+
+template<int size, bool big_endian>
+uint64_t
+Sized_relobj<size, big_endian>::do_output_section_address(
+ unsigned int shndx)
+{
+ // If the input file is linked as --just-symbols, the output
+ // section address is the input section address.
+ if (this->just_symbols())
+ return this->section_address(shndx);
+
+ const Output_section* os = this->do_output_section(shndx);
+ gold_assert(os != NULL);
+ return os->address();
+}
+
+// Class Sized_relobj_file.
+
template<int size, bool big_endian>
-Sized_relobj<size, big_endian>::Sized_relobj(
+Sized_relobj_file<size, big_endian>::Sized_relobj_file(
const std::string& name,
Input_file* input_file,
off_t offset,
const elfcpp::Ehdr<size, big_endian>& ehdr)
- : Relobj(name, input_file, offset),
+ : Sized_relobj<size, big_endian>(name, input_file, offset),
elf_file_(this, ehdr),
symtab_shndx_(-1U),
local_symbol_count_(0),
output_local_symbol_count_(0),
+ output_local_dynsym_count_(0),
symbols_(),
+ defined_count_(0),
local_symbol_offset_(0),
+ local_dynsym_offset_(0),
local_values_(),
- local_got_offsets_(),
- has_eh_frame_(false)
+ local_plt_offsets_(),
+ kept_comdat_sections_(),
+ has_eh_frame_(false),
+ is_deferred_layout_(false),
+ deferred_layout_(),
+ deferred_layout_relocs_(),
+ output_views_(NULL)
{
+ this->e_type_ = ehdr.get_e_type();
}
template<int size, bool big_endian>
-Sized_relobj<size, big_endian>::~Sized_relobj()
+Sized_relobj_file<size, big_endian>::~Sized_relobj_file()
{
}
// Set up an object file based on the file header. This sets up the
-// target and reads the section information.
+// section information.
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::setup(
- const elfcpp::Ehdr<size, big_endian>& ehdr)
+Sized_relobj_file<size, big_endian>::do_setup()
{
- this->set_target(ehdr.get_e_machine(), size, big_endian,
- ehdr.get_e_ident()[elfcpp::EI_OSABI],
- ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]);
-
const unsigned int shnum = this->elf_file_.shnum();
this->set_shnum(shnum);
}
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::find_symtab(const unsigned char* pshdrs)
+Sized_relobj_file<size, big_endian>::find_symtab(const unsigned char* pshdrs)
{
const unsigned int shnum = this->shnum();
this->symtab_shndx_ = 0;
// to put the symbol table at the end.
const unsigned char* p = pshdrs + shnum * This::shdr_size;
unsigned int i = shnum;
+ unsigned int xindex_shndx = 0;
+ unsigned int xindex_link = 0;
while (i > 0)
{
--i;
if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB)
{
this->symtab_shndx_ = i;
+ if (xindex_shndx > 0 && xindex_link == i)
+ {
+ Xindex* xindex =
+ new Xindex(this->elf_file_.large_shndx_offset());
+ xindex->read_symtab_xindex<size, big_endian>(this,
+ xindex_shndx,
+ pshdrs);
+ this->set_xindex(xindex);
+ }
break;
}
+
+ // Try to pick up the SHT_SYMTAB_SHNDX section, if there is
+ // one. This will work if it follows the SHT_SYMTAB
+ // section.
+ if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX)
+ {
+ xindex_shndx = i;
+ xindex_link = this->adjust_shndx(shdr.get_sh_link());
+ }
}
}
}
+// Return the Xindex structure to use for object with lots of
+// sections.
+
+template<int size, bool big_endian>
+Xindex*
+Sized_relobj_file<size, big_endian>::do_initialize_xindex()
+{
+ gold_assert(this->symtab_shndx_ != -1U);
+ Xindex* xindex = new Xindex(this->elf_file_.large_shndx_offset());
+ xindex->initialize_symtab_xindex<size, big_endian>(this, this->symtab_shndx_);
+ return xindex;
+}
+
// Return whether SHDR has the right type and flags to be a GNU
// .eh_frame section.
template<int size, bool big_endian>
bool
-Sized_relobj<size, big_endian>::check_eh_frame_flags(
+Sized_relobj_file<size, big_endian>::check_eh_frame_flags(
const elfcpp::Shdr<size, big_endian>* shdr) const
{
- return (shdr->get_sh_size() > 0
- && shdr->get_sh_type() == elfcpp::SHT_PROGBITS
- && shdr->get_sh_flags() == elfcpp::SHF_ALLOC);
+ elfcpp::Elf_Word sh_type = shdr->get_sh_type();
+ return ((sh_type == elfcpp::SHT_PROGBITS
+ || sh_type == parameters->target().unwind_section_type())
+ && (shdr->get_sh_flags() & elfcpp::SHF_ALLOC) != 0);
+}
+
+// Find the section header with the given name.
+
+template<int size, bool big_endian>
+const unsigned char*
+Object::find_shdr(
+ const unsigned char* pshdrs,
+ const char* name,
+ const char* names,
+ section_size_type names_size,
+ const unsigned char* hdr) const
+{
+ const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
+ const unsigned int shnum = this->shnum();
+ const unsigned char* hdr_end = pshdrs + shdr_size * shnum;
+ size_t sh_name = 0;
+
+ while (1)
+ {
+ if (hdr)
+ {
+ // We found HDR last time we were called, continue looking.
+ typename elfcpp::Shdr<size, big_endian> shdr(hdr);
+ sh_name = shdr.get_sh_name();
+ }
+ else
+ {
+ // Look for the next occurrence of NAME in NAMES.
+ // The fact that .shstrtab produced by current GNU tools is
+ // string merged means we shouldn't have both .not.foo and
+ // .foo in .shstrtab, and multiple .foo sections should all
+ // have the same sh_name. However, this is not guaranteed
+ // by the ELF spec and not all ELF object file producers may
+ // be so clever.
+ size_t len = strlen(name) + 1;
+ const char *p = sh_name ? names + sh_name + len : names;
+ p = reinterpret_cast<const char*>(memmem(p, names_size - (p - names),
+ name, len));
+ if (p == NULL)
+ return NULL;
+ sh_name = p - names;
+ hdr = pshdrs;
+ if (sh_name == 0)
+ return hdr;
+ }
+
+ hdr += shdr_size;
+ while (hdr < hdr_end)
+ {
+ typename elfcpp::Shdr<size, big_endian> shdr(hdr);
+ if (shdr.get_sh_name() == sh_name)
+ return hdr;
+ hdr += shdr_size;
+ }
+ hdr = NULL;
+ if (sh_name == 0)
+ return hdr;
+ }
}
// Return whether there is a GNU .eh_frame section, given the section
template<int size, bool big_endian>
bool
-Sized_relobj<size, big_endian>::find_eh_frame(const unsigned char* pshdrs,
- const char* names,
- off_t names_size) const
+Sized_relobj_file<size, big_endian>::find_eh_frame(
+ const unsigned char* pshdrs,
+ const char* names,
+ section_size_type names_size) const
{
- const unsigned int shnum = this->shnum();
- const unsigned char* p = pshdrs + This::shdr_size;
- for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
+ const unsigned char* s = NULL;
+
+ while (1)
{
- typename This::Shdr shdr(p);
+ s = this->template find_shdr<size, big_endian>(pshdrs, ".eh_frame",
+ names, names_size, s);
+ if (s == NULL)
+ return false;
+
+ typename This::Shdr shdr(s);
if (this->check_eh_frame_flags(&shdr))
+ return true;
+ }
+}
+
+// Return TRUE if this is a section whose contents will be needed in the
+// Add_symbols task. This function is only called for sections that have
+// already passed the test in is_compressed_debug_section() and the debug
+// section name prefix, ".debug"/".zdebug", has been skipped.
+
+static bool
+need_decompressed_section(const char* name)
+{
+ if (*name++ != '_')
+ return false;
+
+#ifdef ENABLE_THREADS
+ // Decompressing these sections now will help only if we're
+ // multithreaded.
+ if (parameters->options().threads())
+ {
+ // We will need .zdebug_str if this is not an incremental link
+ // (i.e., we are processing string merge sections) or if we need
+ // to build a gdb index.
+ if ((!parameters->incremental() || parameters->options().gdb_index())
+ && strcmp(name, "str") == 0)
+ return true;
+
+ // We will need these other sections when building a gdb index.
+ if (parameters->options().gdb_index()
+ && (strcmp(name, "info") == 0
+ || strcmp(name, "types") == 0
+ || strcmp(name, "pubnames") == 0
+ || strcmp(name, "pubtypes") == 0
+ || strcmp(name, "ranges") == 0
+ || strcmp(name, "abbrev") == 0))
+ return true;
+ }
+#endif
+
+ // Even when single-threaded, we will need .zdebug_str if this is
+ // not an incremental link and we are building a gdb index.
+ // Otherwise, we would decompress the section twice: once for
+ // string merge processing, and once for building the gdb index.
+ if (!parameters->incremental()
+ && parameters->options().gdb_index()
+ && strcmp(name, "str") == 0)
+ return true;
+
+ return false;
+}
+
+// Build a table for any compressed debug sections, mapping each section index
+// to the uncompressed size and (if needed) the decompressed contents.
+
+template<int size, bool big_endian>
+Compressed_section_map*
+build_compressed_section_map(
+ const unsigned char* pshdrs,
+ unsigned int shnum,
+ const char* names,
+ section_size_type names_size,
+ Object* obj,
+ bool decompress_if_needed)
+{
+ Compressed_section_map* uncompressed_map = new Compressed_section_map();
+ const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
+ const unsigned char* p = pshdrs + shdr_size;
+
+ for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
+ {
+ typename elfcpp::Shdr<size, big_endian> shdr(p);
+ if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS
+ && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
{
if (shdr.get_sh_name() >= names_size)
{
- this->error(_("bad section name offset for section %u: %lu"),
- i, static_cast<unsigned long>(shdr.get_sh_name()));
+ obj->error(_("bad section name offset for section %u: %lu"),
+ i, static_cast<unsigned long>(shdr.get_sh_name()));
continue;
}
const char* name = names + shdr.get_sh_name();
- if (strcmp(name, ".eh_frame") == 0)
- return true;
+ bool is_compressed = ((shdr.get_sh_flags()
+ & elfcpp::SHF_COMPRESSED) != 0);
+ bool is_zcompressed = (!is_compressed
+ && is_compressed_debug_section(name));
+
+ if (is_zcompressed || is_compressed)
+ {
+ section_size_type len;
+ const unsigned char* contents =
+ obj->section_contents(i, &len, false);
+ uint64_t uncompressed_size;
+ Compressed_section_info info;
+ if (is_zcompressed)
+ {
+ // Skip over the ".zdebug" prefix.
+ name += 7;
+ uncompressed_size = get_uncompressed_size(contents, len);
+ info.addralign = shdr.get_sh_addralign();
+ }
+ else
+ {
+ // Skip over the ".debug" prefix.
+ name += 6;
+ elfcpp::Chdr<size, big_endian> chdr(contents);
+ uncompressed_size = chdr.get_ch_size();
+ info.addralign = chdr.get_ch_addralign();
+ }
+ info.size = convert_to_section_size_type(uncompressed_size);
+ info.flag = shdr.get_sh_flags();
+ info.contents = NULL;
+ if (uncompressed_size != -1ULL)
+ {
+ unsigned char* uncompressed_data = NULL;
+ if (decompress_if_needed && need_decompressed_section(name))
+ {
+ uncompressed_data = new unsigned char[uncompressed_size];
+ if (decompress_input_section(contents, len,
+ uncompressed_data,
+ uncompressed_size,
+ size, big_endian,
+ shdr.get_sh_flags()))
+ info.contents = uncompressed_data;
+ else
+ delete[] uncompressed_data;
+ }
+ (*uncompressed_map)[i] = info;
+ }
+ }
}
}
- return false;
+ return uncompressed_map;
+}
+
+// Stash away info for a number of special sections.
+// Return true if any of the sections found require local symbols to be read.
+
+template<int size, bool big_endian>
+bool
+Sized_relobj_file<size, big_endian>::do_find_special_sections(
+ Read_symbols_data* sd)
+{
+ const unsigned char* const pshdrs = sd->section_headers->data();
+ const unsigned char* namesu = sd->section_names->data();
+ const char* names = reinterpret_cast<const char*>(namesu);
+
+ if (this->find_eh_frame(pshdrs, names, sd->section_names_size))
+ this->has_eh_frame_ = true;
+
+ Compressed_section_map* compressed_sections =
+ build_compressed_section_map<size, big_endian>(
+ pshdrs, this->shnum(), names, sd->section_names_size, this, true);
+ if (compressed_sections != NULL)
+ this->set_compressed_sections(compressed_sections);
+
+ return (this->has_eh_frame_
+ || (!parameters->options().relocatable()
+ && parameters->options().gdb_index()
+ && (memmem(names, sd->section_names_size, "debug_info", 11) != NULL
+ || memmem(names, sd->section_names_size,
+ "debug_types", 12) != NULL)));
}
// Read the sections and symbols from an object file.
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
+Sized_relobj_file<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
+{
+ this->base_read_symbols(sd);
+}
+
+// Read the sections and symbols from an object file. This is common
+// code for all target-specific overrides of do_read_symbols().
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::base_read_symbols(Read_symbols_data* sd)
{
this->read_section_data(&this->elf_file_, sd);
this->find_symtab(pshdrs);
- const unsigned char* namesu = sd->section_names->data();
- const char* names = reinterpret_cast<const char*>(namesu);
- if (this->find_eh_frame(pshdrs, names, sd->section_names_size))
- this->has_eh_frame_ = true;
+ bool need_local_symbols = this->do_find_special_sections(sd);
sd->symbols = NULL;
sd->symbols_size = 0;
+ this->symtab_shndx_ * This::shdr_size);
gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
- // If this object has a .eh_frame section, we need all the symbols.
+ // If this object has a .eh_frame section, or if building a .gdb_index
+ // section and there is debug info, we need all the symbols.
// Otherwise we only need the external symbols. While it would be
// simpler to just always read all the symbols, I've seen object
// files with well over 2000 local symbols, which for a 64-bit
const int sym_size = This::sym_size;
const unsigned int loccount = symtabshdr.get_sh_info();
this->local_symbol_count_ = loccount;
- off_t locsize = loccount * sym_size;
+ this->local_values_.resize(loccount);
+ section_offset_type locsize = loccount * sym_size;
off_t dataoff = symtabshdr.get_sh_offset();
- off_t datasize = symtabshdr.get_sh_size();
+ section_size_type datasize =
+ convert_to_section_size_type(symtabshdr.get_sh_size());
off_t extoff = dataoff + locsize;
- off_t extsize = datasize - locsize;
+ section_size_type extsize = datasize - locsize;
- off_t readoff = this->has_eh_frame_ ? dataoff : extoff;
- off_t readsize = this->has_eh_frame_ ? datasize : extsize;
+ off_t readoff = need_local_symbols ? dataoff : extoff;
+ section_size_type readsize = need_local_symbols ? datasize : extsize;
+
+ if (readsize == 0)
+ {
+ // No external symbols. Also weird but also legal.
+ return;
+ }
- File_view* fvsymtab = this->get_lasting_view(readoff, readsize, false);
+ File_view* fvsymtab = this->get_lasting_view(readoff, readsize, true, false);
// Read the section header for the symbol names.
- unsigned int strtab_shndx = symtabshdr.get_sh_link();
+ unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link());
if (strtab_shndx >= this->shnum())
{
this->error(_("invalid symbol table name index: %u"), strtab_shndx);
// Read the symbol names.
File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(),
- strtabshdr.get_sh_size(), true);
+ strtabshdr.get_sh_size(),
+ false, true);
sd->symbols = fvsymtab;
sd->symbols_size = readsize;
- sd->external_symbols_offset = this->has_eh_frame_ ? locsize : 0;
+ sd->external_symbols_offset = need_local_symbols ? locsize : 0;
sd->symbol_names = fvstrtab;
- sd->symbol_names_size = strtabshdr.get_sh_size();
+ sd->symbol_names_size =
+ convert_to_section_size_type(strtabshdr.get_sh_size());
}
// Return the section index of symbol SYM. Set *VALUE to its value in
-// the object file. Note that for a symbol which is not defined in
-// this object file, this will set *VALUE to 0 and return SHN_UNDEF;
-// it will not return the final value of the symbol in the link.
+// the object file. Set *IS_ORDINARY if this is an ordinary section
+// index, not a special code between SHN_LORESERVE and SHN_HIRESERVE.
+// Note that for a symbol which is not defined in this object file,
+// this will set *VALUE to 0 and return SHN_UNDEF; it will not return
+// the final value of the symbol in the link.
template<int size, bool big_endian>
unsigned int
-Sized_relobj<size, big_endian>::symbol_section_and_value(unsigned int sym,
- Address* value)
+Sized_relobj_file<size, big_endian>::symbol_section_and_value(unsigned int sym,
+ Address* value,
+ bool* is_ordinary)
{
- off_t symbols_size;
+ section_size_type symbols_size;
const unsigned char* symbols = this->section_contents(this->symtab_shndx_,
&symbols_size,
false);
elfcpp::Sym<size, big_endian> elfsym(symbols + sym * This::sym_size);
*value = elfsym.get_st_value();
- // FIXME: Handle SHN_XINDEX.
- return elfsym.get_st_shndx();
+
+ return this->adjust_sym_shndx(sym, elfsym.get_st_shndx(), is_ordinary);
}
// Return whether to include a section group in the link. LAYOUT is
template<int size, bool big_endian>
bool
-Sized_relobj<size, big_endian>::include_section_group(
+Sized_relobj_file<size, big_endian>::include_section_group(
+ Symbol_table* symtab,
Layout* layout,
unsigned int index,
- const elfcpp::Shdr<size, big_endian>& shdr,
+ const char* name,
+ const unsigned char* shdrs,
+ const char* section_names,
+ section_size_type section_names_size,
std::vector<bool>* omit)
{
// Read the section contents.
+ typename This::Shdr shdr(shdrs + index * This::shdr_size);
const unsigned char* pcon = this->get_view(shdr.get_sh_offset(),
- shdr.get_sh_size(), false);
+ shdr.get_sh_size(), true, false);
const elfcpp::Elf_Word* pword =
reinterpret_cast<const elfcpp::Elf_Word*>(pcon);
// groups. Other section groups are always included in the link
// just like ordinary sections.
elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword);
- if ((flags & elfcpp::GRP_COMDAT) == 0)
- return true;
- // Look up the group signature, which is the name of a symbol. This
- // is a lot of effort to go to to read a string. Why didn't they
- // just use the name of the SHT_GROUP section as the group
- // signature?
+ // Look up the group signature, which is the name of a symbol. ELF
+ // uses a symbol name because some group signatures are long, and
+ // the name is generally already in the symbol table, so it makes
+ // sense to put the long string just once in .strtab rather than in
+ // both .strtab and .shstrtab.
// Get the appropriate symbol table header (this will normally be
// the single SHT_SYMTAB section, but in principle it need not be).
- const unsigned int link = shdr.get_sh_link();
+ const unsigned int link = this->adjust_shndx(shdr.get_sh_link());
typename This::Shdr symshdr(this, this->elf_file_.section_header(link));
// Read the symbol table entry.
- if (shdr.get_sh_info() >= symshdr.get_sh_size() / This::sym_size)
+ unsigned int symndx = shdr.get_sh_info();
+ if (symndx >= symshdr.get_sh_size() / This::sym_size)
{
this->error(_("section group %u info %u out of range"),
- index, shdr.get_sh_info());
+ index, symndx);
return false;
}
- off_t symoff = symshdr.get_sh_offset() + shdr.get_sh_info() * This::sym_size;
- const unsigned char* psym = this->get_view(symoff, This::sym_size, true);
+ off_t symoff = symshdr.get_sh_offset() + symndx * This::sym_size;
+ const unsigned char* psym = this->get_view(symoff, This::sym_size, true,
+ false);
elfcpp::Sym<size, big_endian> sym(psym);
// Read the symbol table names.
- off_t symnamelen;
+ section_size_type symnamelen;
const unsigned char* psymnamesu;
- psymnamesu = this->section_contents(symshdr.get_sh_link(), &symnamelen,
- true);
+ psymnamesu = this->section_contents(this->adjust_shndx(symshdr.get_sh_link()),
+ &symnamelen, true);
const char* psymnames = reinterpret_cast<const char*>(psymnamesu);
// Get the section group signature.
if (sym.get_st_name() >= symnamelen)
{
this->error(_("symbol %u name offset %u out of range"),
- shdr.get_sh_info(), sym.get_st_name());
+ symndx, sym.get_st_name());
return false;
}
- const char* signature = psymnames + sym.get_st_name();
+ std::string signature(psymnames + sym.get_st_name());
// It seems that some versions of gas will create a section group
// associated with a section symbol, and then fail to give a name to
// the section symbol. In such a case, use the name of the section.
- // FIXME.
- std::string secname;
if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION)
{
- secname = this->section_name(sym.get_st_shndx());
- signature = secname.c_str();
+ bool is_ordinary;
+ unsigned int sym_shndx = this->adjust_sym_shndx(symndx,
+ sym.get_st_shndx(),
+ &is_ordinary);
+ if (!is_ordinary || sym_shndx >= this->shnum())
+ {
+ this->error(_("symbol %u invalid section index %u"),
+ symndx, sym_shndx);
+ return false;
+ }
+ typename This::Shdr member_shdr(shdrs + sym_shndx * This::shdr_size);
+ if (member_shdr.get_sh_name() < section_names_size)
+ signature = section_names + member_shdr.get_sh_name();
}
- // Record this section group, and see whether we've already seen one
- // with the same signature.
- if (layout->add_comdat(signature, true))
- return true;
+ // Record this section group in the layout, and see whether we've already
+ // seen one with the same signature.
+ bool include_group;
+ bool is_comdat;
+ Kept_section* kept_section = NULL;
+
+ if ((flags & elfcpp::GRP_COMDAT) == 0)
+ {
+ include_group = true;
+ is_comdat = false;
+ }
+ else
+ {
+ include_group = layout->find_or_add_kept_section(signature,
+ this, index, true,
+ true, &kept_section);
+ is_comdat = true;
+ }
+
+ if (is_comdat && include_group)
+ {
+ Incremental_inputs* incremental_inputs = layout->incremental_inputs();
+ if (incremental_inputs != NULL)
+ incremental_inputs->report_comdat_group(this, signature.c_str());
+ }
- // This is a duplicate. We want to discard the sections in this
- // group.
size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word);
+
+ std::vector<unsigned int> shndxes;
+ bool relocate_group = include_group && parameters->options().relocatable();
+ if (relocate_group)
+ shndxes.reserve(count - 1);
+
for (size_t i = 1; i < count; ++i)
{
- elfcpp::Elf_Word secnum =
- elfcpp::Swap<32, big_endian>::readval(pword + i);
- if (secnum >= this->shnum())
+ elfcpp::Elf_Word shndx =
+ this->adjust_shndx(elfcpp::Swap<32, big_endian>::readval(pword + i));
+
+ if (relocate_group)
+ shndxes.push_back(shndx);
+
+ if (shndx >= this->shnum())
{
this->error(_("section %u in section group %u out of range"),
- secnum, index);
+ shndx, index);
continue;
}
- (*omit)[secnum] = true;
+
+ // Check for an earlier section number, since we're going to get
+ // it wrong--we may have already decided to include the section.
+ if (shndx < index)
+ this->error(_("invalid section group %u refers to earlier section %u"),
+ index, shndx);
+
+ // Get the name of the member section.
+ typename This::Shdr member_shdr(shdrs + shndx * This::shdr_size);
+ if (member_shdr.get_sh_name() >= section_names_size)
+ {
+ // This is an error, but it will be diagnosed eventually
+ // in do_layout, so we don't need to do anything here but
+ // ignore it.
+ continue;
+ }
+ std::string mname(section_names + member_shdr.get_sh_name());
+
+ if (include_group)
+ {
+ if (is_comdat)
+ kept_section->add_comdat_section(mname, shndx,
+ member_shdr.get_sh_size());
+ }
+ else
+ {
+ (*omit)[shndx] = true;
+
+ // Store a mapping from this section to the Kept_section
+ // information for the group. This mapping is used for
+ // relocation processing and diagnostics.
+ // If the kept section is a linkonce section, we don't
+ // bother with it unless the comdat group contains just
+ // a single section, making it easy to match up.
+ if (is_comdat
+ && (kept_section->is_comdat() || count == 2))
+ this->set_kept_comdat_section(shndx, true, symndx,
+ member_shdr.get_sh_size(),
+ kept_section);
+ }
}
- return false;
+ if (relocate_group)
+ layout->layout_group(symtab, this, index, name, signature.c_str(),
+ shdr, flags, &shndxes);
+
+ return include_group;
}
// Whether to include a linkonce section in the link. NAME is the
template<int size, bool big_endian>
bool
-Sized_relobj<size, big_endian>::include_linkonce_section(
+Sized_relobj_file<size, big_endian>::include_linkonce_section(
Layout* layout,
+ unsigned int index,
const char* name,
- const elfcpp::Shdr<size, big_endian>&)
+ const elfcpp::Shdr<size, big_endian>& shdr)
{
+ typename elfcpp::Elf_types<size>::Elf_WXword sh_size = shdr.get_sh_size();
// In general the symbol name we want will be the string following
// the last '.'. However, we have to handle the case of
// .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by
symname = name + strlen(linkonce_t);
else
symname = strrchr(name, '.') + 1;
- bool include1 = layout->add_comdat(symname, false);
- bool include2 = layout->add_comdat(name, true);
+ std::string sig1(symname);
+ std::string sig2(name);
+ Kept_section* kept1;
+ Kept_section* kept2;
+ bool include1 = layout->find_or_add_kept_section(sig1, this, index, false,
+ false, &kept1);
+ bool include2 = layout->find_or_add_kept_section(sig2, this, index, false,
+ true, &kept2);
+
+ if (!include2)
+ {
+ // We are not including this section because we already saw the
+ // name of the section as a signature. This normally implies
+ // that the kept section is another linkonce section. If it is
+ // the same size, record it as the section which corresponds to
+ // this one.
+ if (kept2->object() != NULL && !kept2->is_comdat())
+ this->set_kept_comdat_section(index, false, 0, sh_size, kept2);
+ }
+ else if (!include1)
+ {
+ // The section is being discarded on the basis of its symbol
+ // name. This means that the corresponding kept section was
+ // part of a comdat group, and it will be difficult to identify
+ // the specific section within that group that corresponds to
+ // this linkonce section. We'll handle the simple case where
+ // the group has only one member section. Otherwise, it's not
+ // worth the effort.
+ if (kept1->object() != NULL && kept1->is_comdat())
+ this->set_kept_comdat_section(index, false, 0, sh_size, kept1);
+ }
+ else
+ {
+ kept1->set_linkonce_size(sh_size);
+ kept2->set_linkonce_size(sh_size);
+ }
+
return include1 && include2;
}
-// Lay out the input sections. We walk through the sections and check
-// whether they should be included in the link. If they should, we
+// Layout an input section.
+
+template<int size, bool big_endian>
+inline void
+Sized_relobj_file<size, big_endian>::layout_section(
+ Layout* layout,
+ unsigned int shndx,
+ const char* name,
+ const typename This::Shdr& shdr,
+ unsigned int sh_type,
+ unsigned int reloc_shndx,
+ unsigned int reloc_type)
+{
+ off_t offset;
+ Output_section* os = layout->layout(this, shndx, name, shdr, sh_type,
+ reloc_shndx, reloc_type, &offset);
+
+ this->output_sections()[shndx] = os;
+ if (offset == -1)
+ this->section_offsets()[shndx] = invalid_address;
+ else
+ this->section_offsets()[shndx] = convert_types<Address, off_t>(offset);
+
+ // If this section requires special handling, and if there are
+ // relocs that apply to it, then we must do the special handling
+ // before we apply the relocs.
+ if (offset == -1 && reloc_shndx != 0)
+ this->set_relocs_must_follow_section_writes();
+}
+
+// Layout an input .eh_frame section.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::layout_eh_frame_section(
+ Layout* layout,
+ const unsigned char* symbols_data,
+ section_size_type symbols_size,
+ const unsigned char* symbol_names_data,
+ section_size_type symbol_names_size,
+ unsigned int shndx,
+ const typename This::Shdr& shdr,
+ unsigned int reloc_shndx,
+ unsigned int reloc_type)
+{
+ gold_assert(this->has_eh_frame_);
+
+ off_t offset;
+ Output_section* os = layout->layout_eh_frame(this,
+ symbols_data,
+ symbols_size,
+ symbol_names_data,
+ symbol_names_size,
+ shndx,
+ shdr,
+ reloc_shndx,
+ reloc_type,
+ &offset);
+ this->output_sections()[shndx] = os;
+ if (os == NULL || offset == -1)
+ this->section_offsets()[shndx] = invalid_address;
+ else
+ this->section_offsets()[shndx] = convert_types<Address, off_t>(offset);
+
+ // If this section requires special handling, and if there are
+ // relocs that aply to it, then we must do the special handling
+ // before we apply the relocs.
+ if (os != NULL && offset == -1 && reloc_shndx != 0)
+ this->set_relocs_must_follow_section_writes();
+}
+
+// Layout an input .note.gnu.property section.
+
+// This note section has an *extremely* non-standard layout.
+// The gABI spec says that ELF-64 files should have 8-byte fields and
+// 8-byte alignment in the note section, but the Gnu tools generally
+// use 4-byte fields and 4-byte alignment (see the comment for
+// Layout::create_note). This section uses 4-byte fields (i.e.,
+// namesz, descsz, and type are always 4 bytes), the name field is
+// padded to a multiple of 4 bytes, but the desc field is padded
+// to a multiple of 4 or 8 bytes, depending on the ELF class.
+// The individual properties within the desc field always use
+// 4-byte pr_type and pr_datasz fields, but pr_data is padded to
+// a multiple of 4 or 8 bytes, depending on the ELF class.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::layout_gnu_property_section(
+ Layout* layout,
+ unsigned int shndx)
+{
+ section_size_type contents_len;
+ const unsigned char* pcontents = this->section_contents(shndx,
+ &contents_len,
+ false);
+ const unsigned char* pcontents_end = pcontents + contents_len;
+
+ // Loop over all the notes in this section.
+ while (pcontents < pcontents_end)
+ {
+ if (pcontents + 16 > pcontents_end)
+ {
+ gold_warning(_("%s: corrupt .note.gnu.property section "
+ "(note too short)"),
+ this->name().c_str());
+ return;
+ }
+
+ size_t namesz = elfcpp::Swap<32, big_endian>::readval(pcontents);
+ size_t descsz = elfcpp::Swap<32, big_endian>::readval(pcontents + 4);
+ unsigned int ntype = elfcpp::Swap<32, big_endian>::readval(pcontents + 8);
+ const unsigned char* pname = pcontents + 12;
+
+ if (namesz != 4 || strcmp(reinterpret_cast<const char*>(pname), "GNU") != 0)
+ {
+ gold_warning(_("%s: corrupt .note.gnu.property section "
+ "(name is not 'GNU')"),
+ this->name().c_str());
+ return;
+ }
+
+ if (ntype != elfcpp::NT_GNU_PROPERTY_TYPE_0)
+ {
+ gold_warning(_("%s: unsupported note type %d "
+ "in .note.gnu.property section"),
+ this->name().c_str(), ntype);
+ return;
+ }
+
+ size_t aligned_namesz = align_address(namesz, 4);
+ const unsigned char* pdesc = pname + aligned_namesz;
+
+ if (pdesc + descsz > pcontents + contents_len)
+ {
+ gold_warning(_("%s: corrupt .note.gnu.property section"),
+ this->name().c_str());
+ return;
+ }
+
+ const unsigned char* pprop = pdesc;
+
+ // Loop over the program properties in this note.
+ while (pprop < pdesc + descsz)
+ {
+ if (pprop + 8 > pdesc + descsz)
+ {
+ gold_warning(_("%s: corrupt .note.gnu.property section"),
+ this->name().c_str());
+ return;
+ }
+ unsigned int pr_type = elfcpp::Swap<32, big_endian>::readval(pprop);
+ size_t pr_datasz = elfcpp::Swap<32, big_endian>::readval(pprop + 4);
+ pprop += 8;
+ if (pprop + pr_datasz > pdesc + descsz)
+ {
+ gold_warning(_("%s: corrupt .note.gnu.property section"),
+ this->name().c_str());
+ return;
+ }
+ layout->layout_gnu_property(ntype, pr_type, pr_datasz, pprop, this);
+ pprop += align_address(pr_datasz, size / 8);
+ }
+
+ pcontents = pdesc + align_address(descsz, size / 8);
+ }
+}
+
+// This a copy of lto_section defined in GCC (lto-streamer.h)
+
+struct lto_section
+{
+ int16_t major_version;
+ int16_t minor_version;
+ unsigned char slim_object;
+
+ /* Flags is a private field that is not defined publicly. */
+ uint16_t flags;
+};
+
+// Lay out the input sections. We walk through the sections and check
+// whether they should be included in the link. If they should, we
// pass them to the Layout object, which will return an output section
// and an offset.
+// This function is called twice sometimes, two passes, when mapping
+// of input sections to output sections must be delayed.
+// This is true for the following :
+// * Garbage collection (--gc-sections): Some input sections will be
+// discarded and hence the assignment must wait until the second pass.
+// In the first pass, it is for setting up some sections as roots to
+// a work-list for --gc-sections and to do comdat processing.
+// * Identical Code Folding (--icf=<safe,all>): Some input sections
+// will be folded and hence the assignment must wait.
+// * Using plugins to map some sections to unique segments: Mapping
+// some sections to unique segments requires mapping them to unique
+// output sections too. This can be done via plugins now and this
+// information is not available in the first pass.
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::do_layout(Symbol_table* symtab,
- Layout* layout,
- Read_symbols_data* sd)
+Sized_relobj_file<size, big_endian>::do_layout(Symbol_table* symtab,
+ Layout* layout,
+ Read_symbols_data* sd)
{
+ const unsigned int unwind_section_type =
+ parameters->target().unwind_section_type();
const unsigned int shnum = this->shnum();
+
+ /* Should this function be called twice? */
+ bool is_two_pass = (parameters->options().gc_sections()
+ || parameters->options().icf_enabled()
+ || layout->is_unique_segment_for_sections_specified());
+
+ /* Only one of is_pass_one and is_pass_two is true. Both are false when
+ a two-pass approach is not needed. */
+ bool is_pass_one = false;
+ bool is_pass_two = false;
+
+ Symbols_data* gc_sd = NULL;
+
+ /* Check if do_layout needs to be two-pass. If so, find out which pass
+ should happen. In the first pass, the data in sd is saved to be used
+ later in the second pass. */
+ if (is_two_pass)
+ {
+ gc_sd = this->get_symbols_data();
+ if (gc_sd == NULL)
+ {
+ gold_assert(sd != NULL);
+ is_pass_one = true;
+ }
+ else
+ {
+ if (parameters->options().gc_sections())
+ gold_assert(symtab->gc()->is_worklist_ready());
+ if (parameters->options().icf_enabled())
+ gold_assert(symtab->icf()->is_icf_ready());
+ is_pass_two = true;
+ }
+ }
+
if (shnum == 0)
return;
+ if (is_pass_one)
+ {
+ // During garbage collection save the symbols data to use it when
+ // re-entering this function.
+ gc_sd = new Symbols_data;
+ this->copy_symbols_data(gc_sd, sd, This::shdr_size * shnum);
+ this->set_symbols_data(gc_sd);
+ }
+
+ const unsigned char* section_headers_data = NULL;
+ section_size_type section_names_size;
+ const unsigned char* symbols_data = NULL;
+ section_size_type symbols_size;
+ const unsigned char* symbol_names_data = NULL;
+ section_size_type symbol_names_size;
+
+ if (is_two_pass)
+ {
+ section_headers_data = gc_sd->section_headers_data;
+ section_names_size = gc_sd->section_names_size;
+ symbols_data = gc_sd->symbols_data;
+ symbols_size = gc_sd->symbols_size;
+ symbol_names_data = gc_sd->symbol_names_data;
+ symbol_names_size = gc_sd->symbol_names_size;
+ }
+ else
+ {
+ section_headers_data = sd->section_headers->data();
+ section_names_size = sd->section_names_size;
+ if (sd->symbols != NULL)
+ symbols_data = sd->symbols->data();
+ symbols_size = sd->symbols_size;
+ if (sd->symbol_names != NULL)
+ symbol_names_data = sd->symbol_names->data();
+ symbol_names_size = sd->symbol_names_size;
+ }
+
// Get the section headers.
- const unsigned char* pshdrs = sd->section_headers->data();
+ const unsigned char* shdrs = section_headers_data;
+ const unsigned char* pshdrs;
// Get the section names.
- const unsigned char* pnamesu = sd->section_names->data();
+ const unsigned char* pnamesu = (is_two_pass
+ ? gc_sd->section_names_data
+ : sd->section_names->data());
+
const char* pnames = reinterpret_cast<const char*>(pnamesu);
+ // If any input files have been claimed by plugins, we need to defer
+ // actual layout until the replacement files have arrived.
+ const bool should_defer_layout =
+ (parameters->options().has_plugins()
+ && parameters->options().plugins()->should_defer_layout());
+ unsigned int num_sections_to_defer = 0;
+
// For each section, record the index of the reloc section if any.
// Use 0 to mean that there is no reloc section, -1U to mean that
// there is more than one.
std::vector<unsigned int> reloc_shndx(shnum, 0);
std::vector<unsigned int> reloc_type(shnum, elfcpp::SHT_NULL);
// Skip the first, dummy, section.
- pshdrs += This::shdr_size;
+ pshdrs = shdrs + This::shdr_size;
for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size)
{
typename This::Shdr shdr(pshdrs);
+ // Count the number of sections whose layout will be deferred.
+ if (should_defer_layout && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC))
+ ++num_sections_to_defer;
+
unsigned int sh_type = shdr.get_sh_type();
if (sh_type == elfcpp::SHT_REL || sh_type == elfcpp::SHT_RELA)
{
- unsigned int target_shndx = shdr.get_sh_info();
+ unsigned int target_shndx = this->adjust_shndx(shdr.get_sh_info());
if (target_shndx == 0 || target_shndx >= shnum)
{
this->error(_("relocation section %u has bad info %u"),
}
}
- std::vector<Map_to_output>& map_sections(this->map_to_output());
- map_sections.resize(shnum);
+ Output_sections& out_sections(this->output_sections());
+ std::vector<Address>& out_section_offsets(this->section_offsets());
+
+ if (!is_pass_two)
+ {
+ out_sections.resize(shnum);
+ out_section_offsets.resize(shnum);
+ }
+
+ // If we are only linking for symbols, then there is nothing else to
+ // do here.
+ if (this->input_file()->just_symbols())
+ {
+ if (!is_pass_two)
+ {
+ delete sd->section_headers;
+ sd->section_headers = NULL;
+ delete sd->section_names;
+ sd->section_names = NULL;
+ }
+ return;
+ }
+
+ if (num_sections_to_defer > 0)
+ {
+ parameters->options().plugins()->add_deferred_layout_object(this);
+ this->deferred_layout_.reserve(num_sections_to_defer);
+ this->is_deferred_layout_ = true;
+ }
// Whether we've seen a .note.GNU-stack section.
bool seen_gnu_stack = false;
// Keep track of which sections to omit.
std::vector<bool> omit(shnum, false);
+ // Keep track of reloc sections when emitting relocations.
+ const bool relocatable = parameters->options().relocatable();
+ const bool emit_relocs = (relocatable
+ || parameters->options().emit_relocs());
+ std::vector<unsigned int> reloc_sections;
+
// Keep track of .eh_frame sections.
std::vector<unsigned int> eh_frame_sections;
+ // Keep track of .debug_info and .debug_types sections.
+ std::vector<unsigned int> debug_info_sections;
+ std::vector<unsigned int> debug_types_sections;
+
// Skip the first, dummy, section.
- pshdrs = sd->section_headers->data() + This::shdr_size;
+ pshdrs = shdrs + This::shdr_size;
for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size)
{
typename This::Shdr shdr(pshdrs);
+ const unsigned int sh_name = shdr.get_sh_name();
+ unsigned int sh_type = shdr.get_sh_type();
- if (shdr.get_sh_name() >= sd->section_names_size)
+ if (sh_name >= section_names_size)
{
this->error(_("bad section name offset for section %u: %lu"),
- i, static_cast<unsigned long>(shdr.get_sh_name()));
+ i, static_cast<unsigned long>(sh_name));
return;
}
- const char* name = pnames + shdr.get_sh_name();
+ const char* name = pnames + sh_name;
- if (this->handle_gnu_warning_section(name, i, symtab))
+ if (!is_pass_two)
{
- if (!parameters->output_is_object())
- omit[i] = true;
- }
+ if (this->handle_gnu_warning_section(name, i, symtab))
+ {
+ if (!relocatable && !parameters->options().shared())
+ omit[i] = true;
+ }
- // The .note.GNU-stack section is special. It gives the
- // protection flags that this object file requires for the stack
- // in memory.
- if (strcmp(name, ".note.GNU-stack") == 0)
- {
- seen_gnu_stack = true;
- gnu_stack_flags |= shdr.get_sh_flags();
- omit[i] = true;
+ // The .note.GNU-stack section is special. It gives the
+ // protection flags that this object file requires for the stack
+ // in memory.
+ if (strcmp(name, ".note.GNU-stack") == 0)
+ {
+ seen_gnu_stack = true;
+ gnu_stack_flags |= shdr.get_sh_flags();
+ omit[i] = true;
+ }
+
+ // The .note.GNU-split-stack section is also special. It
+ // indicates that the object was compiled with
+ // -fsplit-stack.
+ if (this->handle_split_stack_section(name))
+ {
+ if (!relocatable && !parameters->options().shared())
+ omit[i] = true;
+ }
+
+ // Skip attributes section.
+ if (parameters->target().is_attributes_section(name))
+ {
+ omit[i] = true;
+ }
+
+ // Handle .note.gnu.property sections.
+ if (sh_type == elfcpp::SHT_NOTE
+ && strcmp(name, ".note.gnu.property") == 0)
+ {
+ this->layout_gnu_property_section(layout, i);
+ omit[i] = true;
+ }
+
+ bool discard = omit[i];
+ if (!discard)
+ {
+ if (sh_type == elfcpp::SHT_GROUP)
+ {
+ if (!this->include_section_group(symtab, layout, i, name,
+ shdrs, pnames,
+ section_names_size,
+ &omit))
+ discard = true;
+ }
+ else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0
+ && Layout::is_linkonce(name))
+ {
+ if (!this->include_linkonce_section(layout, i, name, shdr))
+ discard = true;
+ }
+ }
+
+ // Add the section to the incremental inputs layout.
+ Incremental_inputs* incremental_inputs = layout->incremental_inputs();
+ if (incremental_inputs != NULL
+ && !discard
+ && can_incremental_update(sh_type))
+ {
+ off_t sh_size = shdr.get_sh_size();
+ section_size_type uncompressed_size;
+ if (this->section_is_compressed(i, &uncompressed_size))
+ sh_size = uncompressed_size;
+ incremental_inputs->report_input_section(this, i, name, sh_size);
+ }
+
+ if (discard)
+ {
+ // Do not include this section in the link.
+ out_sections[i] = NULL;
+ out_section_offsets[i] = invalid_address;
+ continue;
+ }
}
- bool discard = omit[i];
- if (!discard)
+ if (is_pass_one && parameters->options().gc_sections())
{
- if (shdr.get_sh_type() == elfcpp::SHT_GROUP)
+ if (this->is_section_name_included(name)
+ || layout->keep_input_section (this, name)
+ || sh_type == elfcpp::SHT_INIT_ARRAY
+ || sh_type == elfcpp::SHT_FINI_ARRAY)
{
- if (!this->include_section_group(layout, i, shdr, &omit))
- discard = true;
+ symtab->gc()->worklist().push_back(Section_id(this, i));
}
- else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0
- && Layout::is_linkonce(name))
+ // If the section name XXX can be represented as a C identifier
+ // it cannot be discarded if there are references to
+ // __start_XXX and __stop_XXX symbols. These need to be
+ // specially handled.
+ if (is_cident(name))
{
- if (!this->include_linkonce_section(layout, name, shdr))
- discard = true;
+ symtab->gc()->add_cident_section(name, Section_id(this, i));
}
}
- if (discard)
+ // When doing a relocatable link we are going to copy input
+ // reloc sections into the output. We only want to copy the
+ // ones associated with sections which are not being discarded.
+ // However, we don't know that yet for all sections. So save
+ // reloc sections and process them later. Garbage collection is
+ // not triggered when relocatable code is desired.
+ if (emit_relocs
+ && (sh_type == elfcpp::SHT_REL
+ || sh_type == elfcpp::SHT_RELA))
{
- // Do not include this section in the link.
- map_sections[i].output_section = NULL;
+ reloc_sections.push_back(i);
continue;
}
+ if (relocatable && sh_type == elfcpp::SHT_GROUP)
+ continue;
+
// The .eh_frame section is special. It holds exception frame
// information that we need to read in order to generate the
// exception frame header. We process these after all the other
// sections so that the exception frame reader can reliably
// determine which sections are being discarded, and discard the
// corresponding information.
- if (!parameters->output_is_object()
- && strcmp(name, ".eh_frame") == 0
- && this->check_eh_frame_flags(&shdr))
+ if (this->check_eh_frame_flags(&shdr)
+ && strcmp(name, ".eh_frame") == 0)
+ {
+ // If the target has a special unwind section type, let's
+ // canonicalize it here.
+ sh_type = unwind_section_type;
+ if (!relocatable)
+ {
+ if (is_pass_one)
+ {
+ if (this->is_deferred_layout())
+ out_sections[i] = reinterpret_cast<Output_section*>(2);
+ else
+ out_sections[i] = reinterpret_cast<Output_section*>(1);
+ out_section_offsets[i] = invalid_address;
+ }
+ else if (this->is_deferred_layout())
+ {
+ out_sections[i] = reinterpret_cast<Output_section*>(2);
+ out_section_offsets[i] = invalid_address;
+ this->deferred_layout_.push_back(
+ Deferred_layout(i, name, sh_type, pshdrs,
+ reloc_shndx[i], reloc_type[i]));
+ }
+ else
+ eh_frame_sections.push_back(i);
+ continue;
+ }
+ }
+
+ if (is_pass_two && parameters->options().gc_sections())
+ {
+ // This is executed during the second pass of garbage
+ // collection. do_layout has been called before and some
+ // sections have been already discarded. Simply ignore
+ // such sections this time around.
+ if (out_sections[i] == NULL)
+ {
+ gold_assert(out_section_offsets[i] == invalid_address);
+ continue;
+ }
+ if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0)
+ && symtab->gc()->is_section_garbage(this, i))
+ {
+ if (parameters->options().print_gc_sections())
+ gold_info(_("%s: removing unused section from '%s'"
+ " in file '%s'"),
+ program_name, this->section_name(i).c_str(),
+ this->name().c_str());
+ out_sections[i] = NULL;
+ out_section_offsets[i] = invalid_address;
+ continue;
+ }
+ }
+
+ if (is_pass_two && parameters->options().icf_enabled())
+ {
+ if (out_sections[i] == NULL)
+ {
+ gold_assert(out_section_offsets[i] == invalid_address);
+ continue;
+ }
+ if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0)
+ && symtab->icf()->is_section_folded(this, i))
+ {
+ if (parameters->options().print_icf_sections())
+ {
+ Section_id folded =
+ symtab->icf()->get_folded_section(this, i);
+ Relobj* folded_obj =
+ reinterpret_cast<Relobj*>(folded.first);
+ gold_info(_("%s: ICF folding section '%s' in file '%s' "
+ "into '%s' in file '%s'"),
+ program_name, this->section_name(i).c_str(),
+ this->name().c_str(),
+ folded_obj->section_name(folded.second).c_str(),
+ folded_obj->name().c_str());
+ }
+ out_sections[i] = NULL;
+ out_section_offsets[i] = invalid_address;
+ continue;
+ }
+ }
+
+ // Defer layout here if input files are claimed by plugins. When gc
+ // is turned on this function is called twice; we only want to do this
+ // on the first pass.
+ if (!is_pass_two
+ && this->is_deferred_layout()
+ && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC))
{
- eh_frame_sections.push_back(i);
+ this->deferred_layout_.push_back(Deferred_layout(i, name, sh_type,
+ pshdrs,
+ reloc_shndx[i],
+ reloc_type[i]));
+ // Put dummy values here; real values will be supplied by
+ // do_layout_deferred_sections.
+ out_sections[i] = reinterpret_cast<Output_section*>(2);
+ out_section_offsets[i] = invalid_address;
continue;
}
- off_t offset;
- Output_section* os = layout->layout(this, i, name, shdr,
- reloc_shndx[i], reloc_type[i],
- &offset);
+ // During gc_pass_two if a section that was previously deferred is
+ // found, do not layout the section as layout_deferred_sections will
+ // do it later from gold.cc.
+ if (is_pass_two
+ && (out_sections[i] == reinterpret_cast<Output_section*>(2)))
+ continue;
- map_sections[i].output_section = os;
- map_sections[i].offset = offset;
+ if (is_pass_one)
+ {
+ // This is during garbage collection. The out_sections are
+ // assigned in the second call to this function.
+ out_sections[i] = reinterpret_cast<Output_section*>(1);
+ out_section_offsets[i] = invalid_address;
+ }
+ else
+ {
+ // When garbage collection is switched on the actual layout
+ // only happens in the second call.
+ this->layout_section(layout, i, name, shdr, sh_type, reloc_shndx[i],
+ reloc_type[i]);
+
+ // When generating a .gdb_index section, we do additional
+ // processing of .debug_info and .debug_types sections after all
+ // the other sections for the same reason as above.
+ if (!relocatable
+ && parameters->options().gdb_index()
+ && !(shdr.get_sh_flags() & elfcpp::SHF_ALLOC))
+ {
+ if (strcmp(name, ".debug_info") == 0
+ || strcmp(name, ".zdebug_info") == 0)
+ debug_info_sections.push_back(i);
+ else if (strcmp(name, ".debug_types") == 0
+ || strcmp(name, ".zdebug_types") == 0)
+ debug_types_sections.push_back(i);
+ }
+ }
- // If this section requires special handling, and if there are
- // relocs that apply to it, then we must do the special handling
- // before we apply the relocs.
- if (offset == -1 && reloc_shndx[i] != 0)
- this->set_relocs_must_follow_section_writes();
+ /* GCC uses .gnu.lto_.lto.<some_hash> as a LTO bytecode information
+ section. */
+ const char *lto_section_name = ".gnu.lto_.lto.";
+ if (strncmp (name, lto_section_name, strlen (lto_section_name)) == 0)
+ {
+ section_size_type contents_len;
+ const unsigned char* pcontents
+ = this->section_contents(i, &contents_len, false);
+ if (contents_len >= sizeof(lto_section))
+ {
+ const lto_section* lsection
+ = reinterpret_cast<const lto_section*>(pcontents);
+ if (lsection->slim_object)
+ layout->set_lto_slim_object();
+ }
+ }
}
- layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags);
+ if (!is_pass_two)
+ {
+ layout->merge_gnu_properties(this);
+ layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags, this);
+ }
- // Handle the .eh_frame sections at the end.
+ // Handle the .eh_frame sections after the other sections.
+ gold_assert(!is_pass_one || eh_frame_sections.empty());
for (std::vector<unsigned int>::const_iterator p = eh_frame_sections.begin();
p != eh_frame_sections.end();
++p)
{
- gold_assert(this->has_eh_frame_);
- gold_assert(sd->external_symbols_offset != 0);
+ unsigned int i = *p;
+ const unsigned char* pshdr;
+ pshdr = section_headers_data + i * This::shdr_size;
+ typename This::Shdr shdr(pshdr);
+
+ this->layout_eh_frame_section(layout,
+ symbols_data,
+ symbols_size,
+ symbol_names_data,
+ symbol_names_size,
+ i,
+ shdr,
+ reloc_shndx[i],
+ reloc_type[i]);
+ }
+
+ // When doing a relocatable link handle the reloc sections at the
+ // end. Garbage collection and Identical Code Folding is not
+ // turned on for relocatable code.
+ if (emit_relocs)
+ this->size_relocatable_relocs();
+ gold_assert(!is_two_pass || reloc_sections.empty());
+
+ for (std::vector<unsigned int>::const_iterator p = reloc_sections.begin();
+ p != reloc_sections.end();
+ ++p)
+ {
unsigned int i = *p;
- const unsigned char *pshdr;
- pshdr = sd->section_headers->data() + i * This::shdr_size;
+ const unsigned char* pshdr;
+ pshdr = section_headers_data + i * This::shdr_size;
typename This::Shdr shdr(pshdr);
- off_t offset;
- Output_section* os = layout->layout_eh_frame(this,
- sd->symbols->data(),
- sd->symbols_size,
- sd->symbol_names->data(),
- sd->symbol_names_size,
- i, shdr,
- reloc_shndx[i],
- reloc_type[i],
- &offset);
- map_sections[i].output_section = os;
- map_sections[i].offset = offset;
+ unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info());
+ if (data_shndx >= shnum)
+ {
+ // We already warned about this above.
+ continue;
+ }
+
+ Output_section* data_section = out_sections[data_shndx];
+ if (data_section == reinterpret_cast<Output_section*>(2))
+ {
+ if (is_pass_two)
+ continue;
+ // The layout for the data section was deferred, so we need
+ // to defer the relocation section, too.
+ const char* name = pnames + shdr.get_sh_name();
+ this->deferred_layout_relocs_.push_back(
+ Deferred_layout(i, name, shdr.get_sh_type(), pshdr, 0,
+ elfcpp::SHT_NULL));
+ out_sections[i] = reinterpret_cast<Output_section*>(2);
+ out_section_offsets[i] = invalid_address;
+ continue;
+ }
+ if (data_section == NULL)
+ {
+ out_sections[i] = NULL;
+ out_section_offsets[i] = invalid_address;
+ continue;
+ }
+
+ Relocatable_relocs* rr = new Relocatable_relocs();
+ this->set_relocatable_relocs(i, rr);
- // If this section requires special handling, and if there are
- // relocs that apply to it, then we must do the special handling
- // before we apply the relocs.
- if (offset == -1 && reloc_shndx[i] != 0)
- this->set_relocs_must_follow_section_writes();
+ Output_section* os = layout->layout_reloc(this, i, shdr, data_section,
+ rr);
+ out_sections[i] = os;
+ out_section_offsets[i] = invalid_address;
}
- delete sd->section_headers;
- sd->section_headers = NULL;
- delete sd->section_names;
- sd->section_names = NULL;
+ // When building a .gdb_index section, scan the .debug_info and
+ // .debug_types sections.
+ gold_assert(!is_pass_one
+ || (debug_info_sections.empty() && debug_types_sections.empty()));
+ for (std::vector<unsigned int>::const_iterator p
+ = debug_info_sections.begin();
+ p != debug_info_sections.end();
+ ++p)
+ {
+ unsigned int i = *p;
+ layout->add_to_gdb_index(false, this, symbols_data, symbols_size,
+ i, reloc_shndx[i], reloc_type[i]);
+ }
+ for (std::vector<unsigned int>::const_iterator p
+ = debug_types_sections.begin();
+ p != debug_types_sections.end();
+ ++p)
+ {
+ unsigned int i = *p;
+ layout->add_to_gdb_index(true, this, symbols_data, symbols_size,
+ i, reloc_shndx[i], reloc_type[i]);
+ }
+
+ if (is_pass_two)
+ {
+ delete[] gc_sd->section_headers_data;
+ delete[] gc_sd->section_names_data;
+ delete[] gc_sd->symbols_data;
+ delete[] gc_sd->symbol_names_data;
+ this->set_symbols_data(NULL);
+ }
+ else
+ {
+ delete sd->section_headers;
+ sd->section_headers = NULL;
+ delete sd->section_names;
+ sd->section_names = NULL;
+ }
+}
+
+// Layout sections whose layout was deferred while waiting for
+// input files from a plugin.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::do_layout_deferred_sections(Layout* layout)
+{
+ typename std::vector<Deferred_layout>::iterator deferred;
+
+ for (deferred = this->deferred_layout_.begin();
+ deferred != this->deferred_layout_.end();
+ ++deferred)
+ {
+ typename This::Shdr shdr(deferred->shdr_data_);
+
+ if (!parameters->options().relocatable()
+ && deferred->name_ == ".eh_frame"
+ && this->check_eh_frame_flags(&shdr))
+ {
+ // Checking is_section_included is not reliable for
+ // .eh_frame sections, because they do not have an output
+ // section. This is not a problem normally because we call
+ // layout_eh_frame_section unconditionally, but when
+ // deferring sections that is not true. We don't want to
+ // keep all .eh_frame sections because that will cause us to
+ // keep all sections that they refer to, which is the wrong
+ // way around. Instead, the eh_frame code will discard
+ // .eh_frame sections that refer to discarded sections.
+
+ // Reading the symbols again here may be slow.
+ Read_symbols_data sd;
+ this->base_read_symbols(&sd);
+ this->layout_eh_frame_section(layout,
+ sd.symbols->data(),
+ sd.symbols_size,
+ sd.symbol_names->data(),
+ sd.symbol_names_size,
+ deferred->shndx_,
+ shdr,
+ deferred->reloc_shndx_,
+ deferred->reloc_type_);
+ continue;
+ }
+
+ // If the section is not included, it is because the garbage collector
+ // decided it is not needed. Avoid reverting that decision.
+ if (!this->is_section_included(deferred->shndx_))
+ continue;
+
+ this->layout_section(layout, deferred->shndx_, deferred->name_.c_str(),
+ shdr, shdr.get_sh_type(), deferred->reloc_shndx_,
+ deferred->reloc_type_);
+ }
+
+ this->deferred_layout_.clear();
+
+ // Now handle the deferred relocation sections.
+
+ Output_sections& out_sections(this->output_sections());
+ std::vector<Address>& out_section_offsets(this->section_offsets());
+
+ for (deferred = this->deferred_layout_relocs_.begin();
+ deferred != this->deferred_layout_relocs_.end();
+ ++deferred)
+ {
+ unsigned int shndx = deferred->shndx_;
+ typename This::Shdr shdr(deferred->shdr_data_);
+ unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info());
+
+ Output_section* data_section = out_sections[data_shndx];
+ if (data_section == NULL)
+ {
+ out_sections[shndx] = NULL;
+ out_section_offsets[shndx] = invalid_address;
+ continue;
+ }
+
+ Relocatable_relocs* rr = new Relocatable_relocs();
+ this->set_relocatable_relocs(shndx, rr);
+
+ Output_section* os = layout->layout_reloc(this, shndx, shdr,
+ data_section, rr);
+ out_sections[shndx] = os;
+ out_section_offsets[shndx] = invalid_address;
+ }
}
// Add the symbols to the symbol table.
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
- Read_symbols_data* sd)
+Sized_relobj_file<size, big_endian>::do_add_symbols(Symbol_table* symtab,
+ Read_symbols_data* sd,
+ Layout* layout)
{
if (sd->symbols == NULL)
{
const int sym_size = This::sym_size;
size_t symcount = ((sd->symbols_size - sd->external_symbols_offset)
/ sym_size);
- if (static_cast<off_t>(symcount * sym_size)
- != sd->symbols_size - sd->external_symbols_offset)
+ if (symcount * sym_size != sd->symbols_size - sd->external_symbols_offset)
{
this->error(_("size of symbols is not multiple of symbol size"));
return;
this->symbols_.resize(symcount);
+ if (!parameters->options().relocatable()
+ && layout->is_lto_slim_object ())
+ gold_info(_("%s: plugin needed to handle lto object"),
+ this->name().c_str());
+
const char* sym_names =
reinterpret_cast<const char*>(sd->symbol_names->data());
symtab->add_from_relobj(this,
sd->symbols->data() + sd->external_symbols_offset,
- symcount, sym_names, sd->symbol_names_size,
- &this->symbols_);
+ symcount, this->local_symbol_count_,
+ sym_names, sd->symbol_names_size,
+ &this->symbols_,
+ &this->defined_count_);
delete sd->symbols;
sd->symbols = NULL;
sd->symbol_names = NULL;
}
-// Finalize the local symbols. Here we record the file offset at
-// which they should be output, we add their names to *POOL, and we
-// add their values to THIS->LOCAL_VALUES_. Return the symbol index.
-// This function is always called from the main thread. The actual
-// output of the local symbols will occur in a separate task.
+// Find out if this object, that is a member of a lib group, should be included
+// in the link. We check every symbol defined by this object. If the symbol
+// table has a strong undefined reference to that symbol, we have to include
+// the object.
+
+template<int size, bool big_endian>
+Archive::Should_include
+Sized_relobj_file<size, big_endian>::do_should_include_member(
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_symbols_data* sd,
+ std::string* why)
+{
+ char* tmpbuf = NULL;
+ size_t tmpbuflen = 0;
+ const char* sym_names =
+ reinterpret_cast<const char*>(sd->symbol_names->data());
+ const unsigned char* syms =
+ sd->symbols->data() + sd->external_symbols_offset;
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+ size_t symcount = ((sd->symbols_size - sd->external_symbols_offset)
+ / sym_size);
+
+ const unsigned char* p = syms;
+
+ for (size_t i = 0; i < symcount; ++i, p += sym_size)
+ {
+ elfcpp::Sym<size, big_endian> sym(p);
+ unsigned int st_shndx = sym.get_st_shndx();
+ if (st_shndx == elfcpp::SHN_UNDEF)
+ continue;
+
+ unsigned int st_name = sym.get_st_name();
+ const char* name = sym_names + st_name;
+ Symbol* symbol;
+ Archive::Should_include t = Archive::should_include_member(symtab,
+ layout,
+ name,
+ &symbol, why,
+ &tmpbuf,
+ &tmpbuflen);
+ if (t == Archive::SHOULD_INCLUDE_YES)
+ {
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+ return t;
+ }
+ }
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+ return Archive::SHOULD_INCLUDE_UNKNOWN;
+}
+
+// Iterate over global defined symbols, calling a visitor class V for each.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::do_for_all_global_symbols(
+ Read_symbols_data* sd,
+ Library_base::Symbol_visitor_base* v)
+{
+ const char* sym_names =
+ reinterpret_cast<const char*>(sd->symbol_names->data());
+ const unsigned char* syms =
+ sd->symbols->data() + sd->external_symbols_offset;
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+ size_t symcount = ((sd->symbols_size - sd->external_symbols_offset)
+ / sym_size);
+ const unsigned char* p = syms;
+
+ for (size_t i = 0; i < symcount; ++i, p += sym_size)
+ {
+ elfcpp::Sym<size, big_endian> sym(p);
+ if (sym.get_st_shndx() != elfcpp::SHN_UNDEF)
+ v->visit(sym_names + sym.get_st_name());
+ }
+}
+
+// Return whether the local symbol SYMNDX has a PLT offset.
+
+template<int size, bool big_endian>
+bool
+Sized_relobj_file<size, big_endian>::local_has_plt_offset(
+ unsigned int symndx) const
+{
+ typename Local_plt_offsets::const_iterator p =
+ this->local_plt_offsets_.find(symndx);
+ return p != this->local_plt_offsets_.end();
+}
+
+// Get the PLT offset of a local symbol.
template<int size, bool big_endian>
unsigned int
-Sized_relobj<size, big_endian>::do_finalize_local_symbols(unsigned int index,
- off_t off,
- Stringpool* pool)
+Sized_relobj_file<size, big_endian>::do_local_plt_offset(
+ unsigned int symndx) const
+{
+ typename Local_plt_offsets::const_iterator p =
+ this->local_plt_offsets_.find(symndx);
+ gold_assert(p != this->local_plt_offsets_.end());
+ return p->second;
+}
+
+// Set the PLT offset of a local symbol.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::set_local_plt_offset(
+ unsigned int symndx, unsigned int plt_offset)
+{
+ std::pair<typename Local_plt_offsets::iterator, bool> ins =
+ this->local_plt_offsets_.insert(std::make_pair(symndx, plt_offset));
+ gold_assert(ins.second);
+}
+
+// First pass over the local symbols. Here we add their names to
+// *POOL and *DYNPOOL, and we store the symbol value in
+// THIS->LOCAL_VALUES_. This function is always called from a
+// singleton thread. This is followed by a call to
+// finalize_local_symbols.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::do_count_local_symbols(Stringpool* pool,
+ Stringpool* dynpool)
{
gold_assert(this->symtab_shndx_ != -1U);
if (this->symtab_shndx_ == 0)
{
// This object has no symbols. Weird but legal.
- return index;
+ return;
}
- gold_assert(off == static_cast<off_t>(align_address(off, size >> 3)));
-
- this->local_symbol_offset_ = off;
-
// Read the symbol table section header.
const unsigned int symtab_shndx = this->symtab_shndx_;
typename This::Shdr symtabshdr(this,
gold_assert(loccount == symtabshdr.get_sh_info());
off_t locsize = loccount * sym_size;
const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
- locsize, true);
-
- this->local_values_.resize(loccount);
+ locsize, true, true);
// Read the symbol names.
- const unsigned int strtab_shndx = symtabshdr.get_sh_link();
- off_t strtab_size;
+ const unsigned int strtab_shndx =
+ this->adjust_shndx(symtabshdr.get_sh_link());
+ section_size_type strtab_size;
const unsigned char* pnamesu = this->section_contents(strtab_shndx,
&strtab_size,
true);
// Loop over the local symbols.
- const std::vector<Map_to_output>& mo(this->map_to_output());
+ const Output_sections& out_sections(this->output_sections());
+ std::vector<Address>& out_section_offsets(this->section_offsets());
unsigned int shnum = this->shnum();
unsigned int count = 0;
+ unsigned int dyncount = 0;
// Skip the first, dummy, symbol.
psyms += sym_size;
+ bool strip_all = parameters->options().strip_all();
+ bool discard_all = parameters->options().discard_all();
+ bool discard_locals = parameters->options().discard_locals();
+ bool discard_sec_merge = parameters->options().discard_sec_merge();
for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
{
elfcpp::Sym<size, big_endian> sym(psyms);
Symbol_value<size>& lv(this->local_values_[i]);
- unsigned int shndx = sym.get_st_shndx();
- lv.set_input_shndx(shndx);
+ bool is_ordinary;
+ unsigned int shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(),
+ &is_ordinary);
+ lv.set_input_shndx(shndx, is_ordinary);
if (sym.get_st_type() == elfcpp::STT_SECTION)
lv.set_is_section_symbol();
+ else if (sym.get_st_type() == elfcpp::STT_TLS)
+ lv.set_is_tls_symbol();
+ else if (sym.get_st_type() == elfcpp::STT_GNU_IFUNC)
+ lv.set_is_ifunc_symbol();
- if (shndx >= elfcpp::SHN_LORESERVE)
- {
- if (shndx == elfcpp::SHN_ABS)
- lv.set_output_value(sym.get_st_value());
- else
- {
- // FIXME: Handle SHN_XINDEX.
- this->error(_("unknown section index %u for local symbol %u"),
- shndx, i);
- lv.set_output_value(0);
- }
- }
- else
- {
- if (shndx >= shnum)
- {
- this->error(_("local symbol %u section index %u out of range"),
- i, shndx);
- shndx = 0;
- }
-
- Output_section* os = mo[shndx].output_section;
+ // Save the input symbol value for use in do_finalize_local_symbols().
+ lv.set_input_value(sym.get_st_value());
- if (os == NULL)
- {
- lv.set_output_value(0);
- lv.set_no_output_symtab_entry();
- continue;
- }
+ // Decide whether this symbol should go into the output file.
- if (mo[shndx].offset == -1)
- lv.set_input_value(sym.get_st_value());
- else
- lv.set_output_value(mo[shndx].output_section->address()
- + mo[shndx].offset
- + sym.get_st_value());
+ if (is_ordinary
+ && shndx < shnum
+ && (out_sections[shndx] == NULL
+ || (out_sections[shndx]->order() == ORDER_EHFRAME
+ && out_section_offsets[shndx] == invalid_address)))
+ {
+ // This is either a discarded section or an optimized .eh_frame
+ // section.
+ lv.set_no_output_symtab_entry();
+ gold_assert(!lv.needs_output_dynsym_entry());
+ continue;
}
- // Decide whether this symbol should go into the output file.
-
- if (sym.get_st_type() == elfcpp::STT_SECTION)
+ if (sym.get_st_type() == elfcpp::STT_SECTION
+ || !this->adjust_local_symbol(&lv))
{
lv.set_no_output_symtab_entry();
+ gold_assert(!lv.needs_output_dynsym_entry());
continue;
}
}
const char* name = pnames + sym.get_st_name();
+
+ // If needed, add the symbol to the dynamic symbol table string pool.
+ if (lv.needs_output_dynsym_entry())
+ {
+ dynpool->add(name, true, NULL);
+ ++dyncount;
+ }
+
+ if (strip_all
+ || (discard_all && lv.may_be_discarded_from_output_symtab()))
+ {
+ lv.set_no_output_symtab_entry();
+ continue;
+ }
+
+ // By default, discard temporary local symbols in merge sections.
+ // If --discard-locals option is used, discard all temporary local
+ // symbols. These symbols start with system-specific local label
+ // prefixes, typically .L for ELF system. We want to be compatible
+ // with GNU ld so here we essentially use the same check in
+ // bfd_is_local_label(). The code is different because we already
+ // know that:
+ //
+ // - the symbol is local and thus cannot have global or weak binding.
+ // - the symbol is not a section symbol.
+ // - the symbol has a name.
+ //
+ // We do not discard a symbol if it needs a dynamic symbol entry.
+ if ((discard_locals
+ || (discard_sec_merge
+ && is_ordinary
+ && out_section_offsets[shndx] == invalid_address))
+ && sym.get_st_type() != elfcpp::STT_FILE
+ && !lv.needs_output_dynsym_entry()
+ && lv.may_be_discarded_from_output_symtab()
+ && parameters->target().is_local_label_name(name))
+ {
+ lv.set_no_output_symtab_entry();
+ continue;
+ }
+
+ // Discard the local symbol if -retain_symbols_file is specified
+ // and the local symbol is not in that file.
+ if (!parameters->options().should_retain_symbol(name))
+ {
+ lv.set_no_output_symtab_entry();
+ continue;
+ }
+
+ // Add the symbol to the symbol table string pool.
pool->add(name, true, NULL);
- lv.set_output_symtab_index(index);
- ++index;
++count;
}
this->output_local_symbol_count_ = count;
+ this->output_local_dynsym_count_ = dyncount;
+}
+
+// Compute the final value of a local symbol.
+
+template<int size, bool big_endian>
+typename Sized_relobj_file<size, big_endian>::Compute_final_local_value_status
+Sized_relobj_file<size, big_endian>::compute_final_local_value_internal(
+ unsigned int r_sym,
+ const Symbol_value<size>* lv_in,
+ Symbol_value<size>* lv_out,
+ bool relocatable,
+ const Output_sections& out_sections,
+ const std::vector<Address>& out_offsets,
+ const Symbol_table* symtab)
+{
+ // We are going to overwrite *LV_OUT, if it has a merged symbol value,
+ // we may have a memory leak.
+ gold_assert(lv_out->has_output_value());
+
+ bool is_ordinary;
+ unsigned int shndx = lv_in->input_shndx(&is_ordinary);
+
+ // Set the output symbol value.
+
+ if (!is_ordinary)
+ {
+ if (shndx == elfcpp::SHN_ABS || Symbol::is_common_shndx(shndx))
+ lv_out->set_output_value(lv_in->input_value());
+ else
+ {
+ this->error(_("unknown section index %u for local symbol %u"),
+ shndx, r_sym);
+ lv_out->set_output_value(0);
+ return This::CFLV_ERROR;
+ }
+ }
+ else
+ {
+ if (shndx >= this->shnum())
+ {
+ this->error(_("local symbol %u section index %u out of range"),
+ r_sym, shndx);
+ lv_out->set_output_value(0);
+ return This::CFLV_ERROR;
+ }
+
+ Output_section* os = out_sections[shndx];
+ Address secoffset = out_offsets[shndx];
+ if (symtab->is_section_folded(this, shndx))
+ {
+ gold_assert(os == NULL && secoffset == invalid_address);
+ // Get the os of the section it is folded onto.
+ Section_id folded = symtab->icf()->get_folded_section(this,
+ shndx);
+ gold_assert(folded.first != NULL);
+ Sized_relobj_file<size, big_endian>* folded_obj = reinterpret_cast
+ <Sized_relobj_file<size, big_endian>*>(folded.first);
+ os = folded_obj->output_section(folded.second);
+ gold_assert(os != NULL);
+ secoffset = folded_obj->get_output_section_offset(folded.second);
+
+ // This could be a relaxed input section.
+ if (secoffset == invalid_address)
+ {
+ const Output_relaxed_input_section* relaxed_section =
+ os->find_relaxed_input_section(folded_obj, folded.second);
+ gold_assert(relaxed_section != NULL);
+ secoffset = relaxed_section->address() - os->address();
+ }
+ }
+
+ if (os == NULL)
+ {
+ // This local symbol belongs to a section we are discarding.
+ // In some cases when applying relocations later, we will
+ // attempt to match it to the corresponding kept section,
+ // so we leave the input value unchanged here.
+ return This::CFLV_DISCARDED;
+ }
+ else if (secoffset == invalid_address)
+ {
+ uint64_t start;
+
+ // This is a SHF_MERGE section or one which otherwise
+ // requires special handling.
+ if (os->order() == ORDER_EHFRAME)
+ {
+ // This local symbol belongs to a discarded or optimized
+ // .eh_frame section. Just treat it like the case in which
+ // os == NULL above.
+ gold_assert(this->has_eh_frame_);
+ return This::CFLV_DISCARDED;
+ }
+ else if (!lv_in->is_section_symbol())
+ {
+ // This is not a section symbol. We can determine
+ // the final value now.
+ uint64_t value =
+ os->output_address(this, shndx, lv_in->input_value());
+ if (relocatable)
+ value -= os->address();
+ lv_out->set_output_value(value);
+ }
+ else if (!os->find_starting_output_address(this, shndx, &start))
+ {
+ // This is a section symbol, but apparently not one in a
+ // merged section. First check to see if this is a relaxed
+ // input section. If so, use its address. Otherwise just
+ // use the start of the output section. This happens with
+ // relocatable links when the input object has section
+ // symbols for arbitrary non-merge sections.
+ const Output_section_data* posd =
+ os->find_relaxed_input_section(this, shndx);
+ if (posd != NULL)
+ {
+ uint64_t value = posd->address();
+ if (relocatable)
+ value -= os->address();
+ lv_out->set_output_value(value);
+ }
+ else
+ lv_out->set_output_value(os->address());
+ }
+ else
+ {
+ // We have to consider the addend to determine the
+ // value to use in a relocation. START is the start
+ // of this input section. If we are doing a relocatable
+ // link, use offset from start output section instead of
+ // address.
+ Address adjusted_start =
+ relocatable ? start - os->address() : start;
+ Merged_symbol_value<size>* msv =
+ new Merged_symbol_value<size>(lv_in->input_value(),
+ adjusted_start);
+ lv_out->set_merged_symbol_value(msv);
+ }
+ }
+ else if (lv_in->is_tls_symbol()
+ || (lv_in->is_section_symbol()
+ && (os->flags() & elfcpp::SHF_TLS)))
+ lv_out->set_output_value(os->tls_offset()
+ + secoffset
+ + lv_in->input_value());
+ else
+ lv_out->set_output_value((relocatable ? 0 : os->address())
+ + secoffset
+ + lv_in->input_value());
+ }
+ return This::CFLV_OK;
+}
+
+// Compute final local symbol value. R_SYM is the index of a local
+// symbol in symbol table. LV points to a symbol value, which is
+// expected to hold the input value and to be over-written by the
+// final value. SYMTAB points to a symbol table. Some targets may want
+// to know would-be-finalized local symbol values in relaxation.
+// Hence we provide this method. Since this method updates *LV, a
+// callee should make a copy of the original local symbol value and
+// use the copy instead of modifying an object's local symbols before
+// everything is finalized. The caller should also free up any allocated
+// memory in the return value in *LV.
+template<int size, bool big_endian>
+typename Sized_relobj_file<size, big_endian>::Compute_final_local_value_status
+Sized_relobj_file<size, big_endian>::compute_final_local_value(
+ unsigned int r_sym,
+ const Symbol_value<size>* lv_in,
+ Symbol_value<size>* lv_out,
+ const Symbol_table* symtab)
+{
+ // This is just a wrapper of compute_final_local_value_internal.
+ const bool relocatable = parameters->options().relocatable();
+ const Output_sections& out_sections(this->output_sections());
+ const std::vector<Address>& out_offsets(this->section_offsets());
+ return this->compute_final_local_value_internal(r_sym, lv_in, lv_out,
+ relocatable, out_sections,
+ out_offsets, symtab);
+}
+
+// Finalize the local symbols. Here we set the final value in
+// THIS->LOCAL_VALUES_ and set their output symbol table indexes.
+// This function is always called from a singleton thread. The actual
+// output of the local symbols will occur in a separate task.
+
+template<int size, bool big_endian>
+unsigned int
+Sized_relobj_file<size, big_endian>::do_finalize_local_symbols(
+ unsigned int index,
+ off_t off,
+ Symbol_table* symtab)
+{
+ gold_assert(off == static_cast<off_t>(align_address(off, size >> 3)));
+
+ const unsigned int loccount = this->local_symbol_count_;
+ this->local_symbol_offset_ = off;
+
+ const bool relocatable = parameters->options().relocatable();
+ const Output_sections& out_sections(this->output_sections());
+ const std::vector<Address>& out_offsets(this->section_offsets());
+ for (unsigned int i = 1; i < loccount; ++i)
+ {
+ Symbol_value<size>* lv = &this->local_values_[i];
+
+ Compute_final_local_value_status cflv_status =
+ this->compute_final_local_value_internal(i, lv, lv, relocatable,
+ out_sections, out_offsets,
+ symtab);
+ switch (cflv_status)
+ {
+ case CFLV_OK:
+ if (!lv->is_output_symtab_index_set())
+ {
+ lv->set_output_symtab_index(index);
+ ++index;
+ }
+ if (lv->is_ifunc_symbol()
+ && (lv->has_output_symtab_entry()
+ || lv->needs_output_dynsym_entry()))
+ symtab->set_has_gnu_output();
+ break;
+ case CFLV_DISCARDED:
+ case CFLV_ERROR:
+ // Do nothing.
+ break;
+ default:
+ gold_unreachable();
+ }
+ }
+ return index;
+}
+
+// Set the output dynamic symbol table indexes for the local variables.
+
+template<int size, bool big_endian>
+unsigned int
+Sized_relobj_file<size, big_endian>::do_set_local_dynsym_indexes(
+ unsigned int index)
+{
+ const unsigned int loccount = this->local_symbol_count_;
+ for (unsigned int i = 1; i < loccount; ++i)
+ {
+ Symbol_value<size>& lv(this->local_values_[i]);
+ if (lv.needs_output_dynsym_entry())
+ {
+ lv.set_output_dynsym_index(index);
+ ++index;
+ }
+ }
return index;
}
-// Return the value of the local symbol symndx.
+// Set the offset where local dynamic symbol information will be stored.
+// Returns the count of local symbols contributed to the symbol table by
+// this object.
+
template<int size, bool big_endian>
-typename elfcpp::Elf_types<size>::Elf_Addr
-Sized_relobj<size, big_endian>::local_symbol_value(unsigned int symndx) const
+unsigned int
+Sized_relobj_file<size, big_endian>::do_set_local_dynsym_offset(off_t off)
{
- gold_assert(symndx < this->local_symbol_count_);
- gold_assert(symndx < this->local_values_.size());
- const Symbol_value<size>& lv(this->local_values_[symndx]);
- return lv.value(this, 0);
+ gold_assert(off == static_cast<off_t>(align_address(off, size >> 3)));
+ this->local_dynsym_offset_ = off;
+ return this->output_local_dynsym_count_;
}
-// Return the value of a local symbol defined in input section SHNDX,
-// with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL
-// indicates whether the symbol is a section symbol. This handles
-// SHF_MERGE sections.
+// If Symbols_data is not NULL get the section flags from here otherwise
+// get it from the file.
+
template<int size, bool big_endian>
-typename elfcpp::Elf_types<size>::Elf_Addr
-Sized_relobj<size, big_endian>::local_value(unsigned int shndx,
- Address value,
- bool is_section_symbol,
- Address addend) const
-{
- const std::vector<Map_to_output>& mo(this->map_to_output());
- Output_section* os = mo[shndx].output_section;
- if (os == NULL)
- return addend;
- gold_assert(mo[shndx].offset == -1);
-
- // Do the mapping required by the output section. If this is not a
- // section symbol, then we want to map the symbol value, and then
- // include the addend. If this is a section symbol, then we need to
- // include the addend to figure out where in the section we are,
- // before we do the mapping. This will do the right thing provided
- // the assembler is careful to only convert a relocation in a merged
- // section to a section symbol if there is a zero addend. If the
- // assembler does not do this, then in general we can't know what to
- // do, because we can't distinguish the addend for the instruction
- // format from the addend for the section offset.
-
- if (is_section_symbol)
- return os->output_address(this, shndx, value + addend);
- else
- return addend + os->output_address(this, shndx, value);
+uint64_t
+Sized_relobj_file<size, big_endian>::do_section_flags(unsigned int shndx)
+{
+ Symbols_data* sd = this->get_symbols_data();
+ if (sd != NULL)
+ {
+ const unsigned char* pshdrs = sd->section_headers_data
+ + This::shdr_size * shndx;
+ typename This::Shdr shdr(pshdrs);
+ return shdr.get_sh_flags();
+ }
+ // If sd is NULL, read the section header from the file.
+ return this->elf_file_.section_flags(shndx);
+}
+
+// Get the section's ent size from Symbols_data. Called by get_section_contents
+// in icf.cc
+
+template<int size, bool big_endian>
+uint64_t
+Sized_relobj_file<size, big_endian>::do_section_entsize(unsigned int shndx)
+{
+ Symbols_data* sd = this->get_symbols_data();
+ gold_assert(sd != NULL);
+
+ const unsigned char* pshdrs = sd->section_headers_data
+ + This::shdr_size * shndx;
+ typename This::Shdr shdr(pshdrs);
+ return shdr.get_sh_entsize();
}
// Write out the local symbols.
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::write_local_symbols(Output_file* of,
- const Stringpool* sympool)
+Sized_relobj_file<size, big_endian>::write_local_symbols(
+ Output_file* of,
+ const Stringpool* sympool,
+ const Stringpool* dynpool,
+ Output_symtab_xindex* symtab_xindex,
+ Output_symtab_xindex* dynsym_xindex,
+ off_t symtab_off)
{
- if (parameters->strip_all())
- return;
+ const bool strip_all = parameters->options().strip_all();
+ if (strip_all)
+ {
+ if (this->output_local_dynsym_count_ == 0)
+ return;
+ this->output_local_symbol_count_ = 0;
+ }
gold_assert(this->symtab_shndx_ != -1U);
if (this->symtab_shndx_ == 0)
const int sym_size = This::sym_size;
off_t locsize = loccount * sym_size;
const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
- locsize, false);
+ locsize, true, false);
// Read the symbol names.
- const unsigned int strtab_shndx = symtabshdr.get_sh_link();
- off_t strtab_size;
+ const unsigned int strtab_shndx =
+ this->adjust_shndx(symtabshdr.get_sh_link());
+ section_size_type strtab_size;
const unsigned char* pnamesu = this->section_contents(strtab_shndx,
&strtab_size,
- true);
+ false);
const char* pnames = reinterpret_cast<const char*>(pnamesu);
- // Get a view into the output file.
+ // Get views into the output file for the portions of the symbol table
+ // and the dynamic symbol table that we will be writing.
off_t output_size = this->output_local_symbol_count_ * sym_size;
- unsigned char* oview = of->get_output_view(this->local_symbol_offset_,
- output_size);
+ unsigned char* oview = NULL;
+ if (output_size > 0)
+ oview = of->get_output_view(symtab_off + this->local_symbol_offset_,
+ output_size);
- const std::vector<Map_to_output>& mo(this->map_to_output());
+ off_t dyn_output_size = this->output_local_dynsym_count_ * sym_size;
+ unsigned char* dyn_oview = NULL;
+ if (dyn_output_size > 0)
+ dyn_oview = of->get_output_view(this->local_dynsym_offset_,
+ dyn_output_size);
+
+ const Output_sections& out_sections(this->output_sections());
gold_assert(this->local_values_.size() == loccount);
unsigned char* ov = oview;
+ unsigned char* dyn_ov = dyn_oview;
psyms += sym_size;
for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
{
elfcpp::Sym<size, big_endian> isym(psyms);
- if (!this->local_values_[i].needs_output_symtab_entry())
- continue;
+ Symbol_value<size>& lv(this->local_values_[i]);
- unsigned int st_shndx = isym.get_st_shndx();
- if (st_shndx < elfcpp::SHN_LORESERVE)
+ bool is_ordinary;
+ unsigned int st_shndx = this->adjust_sym_shndx(i, isym.get_st_shndx(),
+ &is_ordinary);
+ if (is_ordinary)
{
- gold_assert(st_shndx < mo.size());
- if (mo[st_shndx].output_section == NULL)
+ gold_assert(st_shndx < out_sections.size());
+ if (out_sections[st_shndx] == NULL)
continue;
- st_shndx = mo[st_shndx].output_section->out_shndx();
+ st_shndx = out_sections[st_shndx]->out_shndx();
+ if (st_shndx >= elfcpp::SHN_LORESERVE)
+ {
+ if (lv.has_output_symtab_entry())
+ symtab_xindex->add(lv.output_symtab_index(), st_shndx);
+ if (lv.has_output_dynsym_entry())
+ dynsym_xindex->add(lv.output_dynsym_index(), st_shndx);
+ st_shndx = elfcpp::SHN_XINDEX;
+ }
+ }
+
+ // Write the symbol to the output symbol table.
+ if (lv.has_output_symtab_entry())
+ {
+ elfcpp::Sym_write<size, big_endian> osym(ov);
+
+ gold_assert(isym.get_st_name() < strtab_size);
+ const char* name = pnames + isym.get_st_name();
+ osym.put_st_name(sympool->get_offset(name));
+ osym.put_st_value(lv.value(this, 0));
+ osym.put_st_size(isym.get_st_size());
+ osym.put_st_info(isym.get_st_info());
+ osym.put_st_other(isym.get_st_other());
+ osym.put_st_shndx(st_shndx);
+
+ ov += sym_size;
+ }
+
+ // Write the symbol to the output dynamic symbol table.
+ if (lv.has_output_dynsym_entry())
+ {
+ gold_assert(dyn_ov < dyn_oview + dyn_output_size);
+ elfcpp::Sym_write<size, big_endian> osym(dyn_ov);
+
+ gold_assert(isym.get_st_name() < strtab_size);
+ const char* name = pnames + isym.get_st_name();
+ osym.put_st_name(dynpool->get_offset(name));
+ osym.put_st_value(lv.value(this, 0));
+ osym.put_st_size(isym.get_st_size());
+ osym.put_st_info(isym.get_st_info());
+ osym.put_st_other(isym.get_st_other());
+ osym.put_st_shndx(st_shndx);
+
+ dyn_ov += sym_size;
+ }
+ }
+
+
+ if (output_size > 0)
+ {
+ gold_assert(ov - oview == output_size);
+ of->write_output_view(symtab_off + this->local_symbol_offset_,
+ output_size, oview);
+ }
+
+ if (dyn_output_size > 0)
+ {
+ gold_assert(dyn_ov - dyn_oview == dyn_output_size);
+ of->write_output_view(this->local_dynsym_offset_, dyn_output_size,
+ dyn_oview);
+ }
+}
+
+// Set *INFO to symbolic information about the offset OFFSET in the
+// section SHNDX. Return true if we found something, false if we
+// found nothing.
+
+template<int size, bool big_endian>
+bool
+Sized_relobj_file<size, big_endian>::get_symbol_location_info(
+ unsigned int shndx,
+ off_t offset,
+ Symbol_location_info* info)
+{
+ if (this->symtab_shndx_ == 0)
+ return false;
+
+ section_size_type symbols_size;
+ const unsigned char* symbols = this->section_contents(this->symtab_shndx_,
+ &symbols_size,
+ false);
+
+ unsigned int symbol_names_shndx =
+ this->adjust_shndx(this->section_link(this->symtab_shndx_));
+ section_size_type names_size;
+ const unsigned char* symbol_names_u =
+ this->section_contents(symbol_names_shndx, &names_size, false);
+ const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u);
+
+ const int sym_size = This::sym_size;
+ const size_t count = symbols_size / sym_size;
+
+ const unsigned char* p = symbols;
+ for (size_t i = 0; i < count; ++i, p += sym_size)
+ {
+ elfcpp::Sym<size, big_endian> sym(p);
+
+ if (sym.get_st_type() == elfcpp::STT_FILE)
+ {
+ if (sym.get_st_name() >= names_size)
+ info->source_file = "(invalid)";
+ else
+ info->source_file = symbol_names + sym.get_st_name();
+ continue;
+ }
+
+ bool is_ordinary;
+ unsigned int st_shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(),
+ &is_ordinary);
+ if (is_ordinary
+ && st_shndx == shndx
+ && static_cast<off_t>(sym.get_st_value()) <= offset
+ && (static_cast<off_t>(sym.get_st_value() + sym.get_st_size())
+ > offset))
+ {
+ info->enclosing_symbol_type = sym.get_st_type();
+ if (sym.get_st_name() > names_size)
+ info->enclosing_symbol_name = "(invalid)";
+ else
+ {
+ info->enclosing_symbol_name = symbol_names + sym.get_st_name();
+ if (parameters->options().do_demangle())
+ {
+ char* demangled_name = cplus_demangle(
+ info->enclosing_symbol_name.c_str(),
+ DMGL_ANSI | DMGL_PARAMS);
+ if (demangled_name != NULL)
+ {
+ info->enclosing_symbol_name.assign(demangled_name);
+ free(demangled_name);
+ }
+ }
+ }
+ return true;
}
+ }
- elfcpp::Sym_write<size, big_endian> osym(ov);
+ return false;
+}
- gold_assert(isym.get_st_name() < strtab_size);
- const char* name = pnames + isym.get_st_name();
- osym.put_st_name(sympool->get_offset(name));
- osym.put_st_value(this->local_values_[i].value(this, 0));
- osym.put_st_size(isym.get_st_size());
- osym.put_st_info(isym.get_st_info());
- osym.put_st_other(isym.get_st_other());
- osym.put_st_shndx(st_shndx);
+// Look for a kept section corresponding to the given discarded section,
+// and return its output address. This is used only for relocations in
+// debugging sections. If we can't find the kept section, return 0.
- ov += sym_size;
+template<int size, bool big_endian>
+typename Sized_relobj_file<size, big_endian>::Address
+Sized_relobj_file<size, big_endian>::map_to_kept_section(
+ unsigned int shndx,
+ std::string& section_name,
+ bool* pfound) const
+{
+ Kept_section* kept_section;
+ bool is_comdat;
+ uint64_t sh_size;
+ unsigned int symndx;
+ bool found = false;
+
+ if (this->get_kept_comdat_section(shndx, &is_comdat, &symndx, &sh_size,
+ &kept_section))
+ {
+ Relobj* kept_object = kept_section->object();
+ unsigned int kept_shndx = 0;
+ if (!kept_section->is_comdat())
+ {
+ // The kept section is a linkonce section.
+ if (sh_size == kept_section->linkonce_size())
+ found = true;
+ }
+ else
+ {
+ if (is_comdat)
+ {
+ // Find the corresponding kept section.
+ // Since we're using this mapping for relocation processing,
+ // we don't want to match sections unless they have the same
+ // size.
+ uint64_t kept_size = 0;
+ if (kept_section->find_comdat_section(section_name, &kept_shndx,
+ &kept_size))
+ {
+ if (sh_size == kept_size)
+ found = true;
+ }
+ }
+ else
+ {
+ uint64_t kept_size = 0;
+ if (kept_section->find_single_comdat_section(&kept_shndx,
+ &kept_size)
+ && sh_size == kept_size)
+ found = true;
+ }
+ }
+
+ if (found)
+ {
+ Sized_relobj_file<size, big_endian>* kept_relobj =
+ static_cast<Sized_relobj_file<size, big_endian>*>(kept_object);
+ Output_section* os = kept_relobj->output_section(kept_shndx);
+ Address offset = kept_relobj->get_output_section_offset(kept_shndx);
+ if (os != NULL && offset != invalid_address)
+ {
+ *pfound = true;
+ return os->address() + offset;
+ }
+ }
}
+ *pfound = false;
+ return 0;
+}
- gold_assert(ov - oview == output_size);
+// Look for a kept section corresponding to the given discarded section,
+// and return its object file.
- of->write_output_view(this->local_symbol_offset_, output_size, oview);
+template<int size, bool big_endian>
+Relobj*
+Sized_relobj_file<size, big_endian>::find_kept_section_object(
+ unsigned int shndx, unsigned int *symndx_p) const
+{
+ Kept_section* kept_section;
+ bool is_comdat;
+ uint64_t sh_size;
+ if (this->get_kept_comdat_section(shndx, &is_comdat, symndx_p, &sh_size,
+ &kept_section))
+ return kept_section->object();
+ return NULL;
}
-// Set *INFO to symbolic information about the offset OFFSET in the
-// section SHNDX. Return true if we found something, false if we
-// found nothing.
+// Return the name of symbol SYMNDX.
template<int size, bool big_endian>
-bool
-Sized_relobj<size, big_endian>::get_symbol_location_info(
- unsigned int shndx,
- off_t offset,
- Symbol_location_info* info)
+const char*
+Sized_relobj_file<size, big_endian>::get_symbol_name(unsigned int symndx)
{
if (this->symtab_shndx_ == 0)
- return false;
+ return NULL;
- off_t symbols_size;
+ section_size_type symbols_size;
const unsigned char* symbols = this->section_contents(this->symtab_shndx_,
&symbols_size,
false);
- unsigned int symbol_names_shndx = this->section_link(this->symtab_shndx_);
- off_t names_size;
+ unsigned int symbol_names_shndx =
+ this->adjust_shndx(this->section_link(this->symtab_shndx_));
+ section_size_type names_size;
const unsigned char* symbol_names_u =
this->section_contents(symbol_names_shndx, &names_size, false);
const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u);
- const int sym_size = This::sym_size;
- const size_t count = symbols_size / sym_size;
+ const unsigned char* p = symbols + symndx * This::sym_size;
- const unsigned char* p = symbols;
- for (size_t i = 0; i < count; ++i, p += sym_size)
+ if (p >= symbols + symbols_size)
+ return NULL;
+
+ elfcpp::Sym<size, big_endian> sym(p);
+
+ return symbol_names + sym.get_st_name();
+}
+
+// Get symbol counts.
+
+template<int size, bool big_endian>
+void
+Sized_relobj_file<size, big_endian>::do_get_global_symbol_counts(
+ const Symbol_table*,
+ size_t* defined,
+ size_t* used) const
+{
+ *defined = this->defined_count_;
+ size_t count = 0;
+ for (typename Symbols::const_iterator p = this->symbols_.begin();
+ p != this->symbols_.end();
+ ++p)
+ if (*p != NULL
+ && (*p)->source() == Symbol::FROM_OBJECT
+ && (*p)->object() == this
+ && (*p)->is_defined())
+ ++count;
+ *used = count;
+}
+
+// Return a view of the decompressed contents of a section. Set *PLEN
+// to the size. Set *IS_NEW to true if the contents need to be freed
+// by the caller.
+
+const unsigned char*
+Object::decompressed_section_contents(
+ unsigned int shndx,
+ section_size_type* plen,
+ bool* is_new,
+ uint64_t* palign)
+{
+ section_size_type buffer_size;
+ const unsigned char* buffer = this->do_section_contents(shndx, &buffer_size,
+ false);
+
+ if (this->compressed_sections_ == NULL)
{
- elfcpp::Sym<size, big_endian> sym(p);
+ *plen = buffer_size;
+ *is_new = false;
+ return buffer;
+ }
- if (sym.get_st_type() == elfcpp::STT_FILE)
+ Compressed_section_map::const_iterator p =
+ this->compressed_sections_->find(shndx);
+ if (p == this->compressed_sections_->end())
+ {
+ *plen = buffer_size;
+ *is_new = false;
+ return buffer;
+ }
+
+ section_size_type uncompressed_size = p->second.size;
+ if (p->second.contents != NULL)
+ {
+ *plen = uncompressed_size;
+ *is_new = false;
+ if (palign != NULL)
+ *palign = p->second.addralign;
+ return p->second.contents;
+ }
+
+ unsigned char* uncompressed_data = new unsigned char[uncompressed_size];
+ if (!decompress_input_section(buffer,
+ buffer_size,
+ uncompressed_data,
+ uncompressed_size,
+ elfsize(),
+ is_big_endian(),
+ p->second.flag))
+ this->error(_("could not decompress section %s"),
+ this->do_section_name(shndx).c_str());
+
+ // We could cache the results in p->second.contents and store
+ // false in *IS_NEW, but build_compressed_section_map() would
+ // have done so if it had expected it to be profitable. If
+ // we reach this point, we expect to need the contents only
+ // once in this pass.
+ *plen = uncompressed_size;
+ *is_new = true;
+ if (palign != NULL)
+ *palign = p->second.addralign;
+ return uncompressed_data;
+}
+
+// Discard any buffers of uncompressed sections. This is done
+// at the end of the Add_symbols task.
+
+void
+Object::discard_decompressed_sections()
+{
+ if (this->compressed_sections_ == NULL)
+ return;
+
+ for (Compressed_section_map::iterator p = this->compressed_sections_->begin();
+ p != this->compressed_sections_->end();
+ ++p)
+ {
+ if (p->second.contents != NULL)
{
- if (sym.get_st_name() >= names_size)
- info->source_file = "(invalid)";
- else
- info->source_file = symbol_names + sym.get_st_name();
+ delete[] p->second.contents;
+ p->second.contents = NULL;
}
- else if (sym.get_st_shndx() == shndx
- && static_cast<off_t>(sym.get_st_value()) <= offset
- && (static_cast<off_t>(sym.get_st_value() + sym.get_st_size())
- > offset))
- {
- if (sym.get_st_name() > names_size)
- info->enclosing_symbol_name = "(invalid)";
- else
- info->enclosing_symbol_name = symbol_names + sym.get_st_name();
- return true;
- }
}
-
- return false;
}
// Input_objects methods.
bool
Input_objects::add_object(Object* obj)
{
- Target* target = obj->target();
- if (this->target_ == NULL)
- this->target_ = target;
- else if (this->target_ != target)
- {
- gold_error(_("%s: incompatible target"), obj->name().c_str());
- return false;
- }
+ // Print the filename if the -t/--trace option is selected.
+ if (parameters->options().trace())
+ gold_info("%s", obj->name().c_str());
if (!obj->is_dynamic())
this->relobj_list_.push_back(static_cast<Relobj*>(obj));
{
// See if this is a duplicate SONAME.
Dynobj* dynobj = static_cast<Dynobj*>(obj);
+ const char* soname = dynobj->soname();
- std::pair<Unordered_set<std::string>::iterator, bool> ins =
- this->sonames_.insert(dynobj->soname());
+ Unordered_map<std::string, Object*>::value_type val(soname, obj);
+ std::pair<Unordered_map<std::string, Object*>::iterator, bool> ins =
+ this->sonames_.insert(val);
if (!ins.second)
{
// We have already seen a dynamic object with this soname.
+ // If any instances of this object on the command line have
+ // the --no-as-needed flag, make sure the one we keep is
+ // marked so.
+ if (!obj->as_needed())
+ {
+ gold_assert(ins.first->second != NULL);
+ ins.first->second->clear_as_needed();
+ }
return false;
}
this->dynobj_list_.push_back(dynobj);
}
- set_parameters_size_and_endianness(target->get_size(),
- target->is_big_endian());
+ // Add this object to the cross-referencer if requested.
+ if (parameters->options().user_set_print_symbol_counts()
+ || parameters->options().cref())
+ {
+ if (this->cref_ == NULL)
+ this->cref_ = new Cref();
+ this->cref_->add_object(obj);
+ }
return true;
}
+// For each dynamic object, record whether we've seen all of its
+// explicit dependencies.
+
+void
+Input_objects::check_dynamic_dependencies() const
+{
+ bool issued_copy_dt_needed_error = false;
+ for (Dynobj_list::const_iterator p = this->dynobj_list_.begin();
+ p != this->dynobj_list_.end();
+ ++p)
+ {
+ const Dynobj::Needed& needed((*p)->needed());
+ bool found_all = true;
+ Dynobj::Needed::const_iterator pneeded;
+ for (pneeded = needed.begin(); pneeded != needed.end(); ++pneeded)
+ {
+ if (this->sonames_.find(*pneeded) == this->sonames_.end())
+ {
+ found_all = false;
+ break;
+ }
+ }
+ (*p)->set_has_unknown_needed_entries(!found_all);
+
+ // --copy-dt-needed-entries aka --add-needed is a GNU ld option
+ // that gold does not support. However, they cause no trouble
+ // unless there is a DT_NEEDED entry that we don't know about;
+ // warn only in that case.
+ if (!found_all
+ && !issued_copy_dt_needed_error
+ && (parameters->options().copy_dt_needed_entries()
+ || parameters->options().add_needed()))
+ {
+ const char* optname;
+ if (parameters->options().copy_dt_needed_entries())
+ optname = "--copy-dt-needed-entries";
+ else
+ optname = "--add-needed";
+ gold_error(_("%s is not supported but is required for %s in %s"),
+ optname, (*pneeded).c_str(), (*p)->name().c_str());
+ issued_copy_dt_needed_error = true;
+ }
+ }
+}
+
+// Start processing an archive.
+
+void
+Input_objects::archive_start(Archive* archive)
+{
+ if (parameters->options().user_set_print_symbol_counts()
+ || parameters->options().cref())
+ {
+ if (this->cref_ == NULL)
+ this->cref_ = new Cref();
+ this->cref_->add_archive_start(archive);
+ }
+}
+
+// Stop processing an archive.
+
+void
+Input_objects::archive_stop(Archive* archive)
+{
+ if (parameters->options().user_set_print_symbol_counts()
+ || parameters->options().cref())
+ this->cref_->add_archive_stop(archive);
+}
+
+// Print symbol counts
+
+void
+Input_objects::print_symbol_counts(const Symbol_table* symtab) const
+{
+ if (parameters->options().user_set_print_symbol_counts()
+ && this->cref_ != NULL)
+ this->cref_->print_symbol_counts(symtab);
+}
+
+// Print a cross reference table.
+
+void
+Input_objects::print_cref(const Symbol_table* symtab, FILE* f) const
+{
+ if (parameters->options().cref() && this->cref_ != NULL)
+ this->cref_->print_cref(symtab, f);
+}
+
// Relocate_info methods.
-// Return a string describing the location of a relocation. This is
-// only used in error messages.
+// Return a string describing the location of a relocation when file
+// and lineno information is not available. This is only used in
+// error messages.
template<int size, bool big_endian>
std::string
Relocate_info<size, big_endian>::location(size_t, off_t offset) const
{
- // See if we can get line-number information from debugging sections.
- std::string filename;
- std::string file_and_lineno; // Better than filename-only, if available.
+ Sized_dwarf_line_info<size, big_endian> line_info(this->object);
+ std::string ret = line_info.addr2line(this->data_shndx, offset, NULL);
+ if (!ret.empty())
+ return ret;
- Dwarf_line_info<size, big_endian> line_info(this->object);
- // This will be "" if we failed to parse the debug info for any reason.
- file_and_lineno = line_info.addr2line(this->data_shndx, offset);
+ ret = this->object->name();
- std::string ret(this->object->name());
- ret += ':';
Symbol_location_info info;
if (this->object->get_symbol_location_info(this->data_shndx, offset, &info))
{
- ret += " in function ";
- // We could demangle this name before printing, but we don't
- // bother because gcc runs linker output through a demangle
- // filter itself. The only advantage to demangling here is if
- // someone might call ld directly, rather than via gcc. If we
- // did want to demangle, cplus_demangle() is in libiberty.
- ret += info.enclosing_symbol_name;
+ if (!info.source_file.empty())
+ {
+ ret += ":";
+ ret += info.source_file;
+ }
ret += ":";
- filename = info.source_file;
+ if (info.enclosing_symbol_type == elfcpp::STT_FUNC)
+ ret += _("function ");
+ ret += info.enclosing_symbol_name;
+ return ret;
}
- if (!file_and_lineno.empty())
- ret += file_and_lineno;
- else
- {
- if (!filename.empty())
- ret += filename;
- ret += "(";
- ret += this->object->section_name(this->data_shndx);
- char buf[100];
- // Offsets into sections have to be positive.
- snprintf(buf, sizeof(buf), "+0x%lx", static_cast<long>(offset));
- ret += buf;
- ret += ")";
- }
+ ret += "(";
+ ret += this->object->section_name(this->data_shndx);
+ char buf[100];
+ snprintf(buf, sizeof buf, "+0x%lx)", static_cast<long>(offset));
+ ret += buf;
return ret;
}
template<int size, bool big_endian>
Object*
make_elf_sized_object(const std::string& name, Input_file* input_file,
- off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr)
+ off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr,
+ bool* punconfigured)
{
- int et = ehdr.get_e_type();
- if (et == elfcpp::ET_REL)
- {
- Sized_relobj<size, big_endian>* obj =
- new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr);
- obj->setup(ehdr);
- return obj;
- }
- else if (et == elfcpp::ET_DYN)
- {
- Sized_dynobj<size, big_endian>* obj =
- new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr);
- obj->setup(ehdr);
- return obj;
- }
- else
+ Target* target = select_target(input_file, offset,
+ ehdr.get_e_machine(), size, big_endian,
+ ehdr.get_e_ident()[elfcpp::EI_OSABI],
+ ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]);
+ if (target == NULL)
+ gold_fatal(_("%s: unsupported ELF machine number %d"),
+ name.c_str(), ehdr.get_e_machine());
+
+ if (!parameters->target_valid())
+ set_parameters_target(target);
+ else if (target != ¶meters->target())
{
- gold_error(_("%s: unsupported ELF file type %d"),
- name.c_str(), et);
+ if (punconfigured != NULL)
+ *punconfigured = true;
+ else
+ gold_error(_("%s: incompatible target"), name.c_str());
return NULL;
}
+
+ return target->make_elf_object<size, big_endian>(name, input_file, offset,
+ ehdr);
}
} // End anonymous namespace.
namespace gold
{
-// Read an ELF file and return the appropriate instance of Object.
+// Return whether INPUT_FILE is an ELF object.
-Object*
-make_elf_object(const std::string& name, Input_file* input_file, off_t offset,
- const unsigned char* p, off_t bytes)
+bool
+is_elf_object(Input_file* input_file, off_t offset,
+ const unsigned char** start, int* read_size)
{
- if (bytes < elfcpp::EI_NIDENT)
- {
- gold_error(_("%s: ELF file too short"), name.c_str());
- return NULL;
- }
+ off_t filesize = input_file->file().filesize();
+ int want = elfcpp::Elf_recognizer::max_header_size;
+ if (filesize - offset < want)
+ want = filesize - offset;
- int v = p[elfcpp::EI_VERSION];
- if (v != elfcpp::EV_CURRENT)
- {
- if (v == elfcpp::EV_NONE)
- gold_error(_("%s: invalid ELF version 0"), name.c_str());
- else
- gold_error(_("%s: unsupported ELF version %d"), name.c_str(), v);
- return NULL;
- }
+ const unsigned char* p = input_file->file().get_view(offset, 0, want,
+ true, false);
+ *start = p;
+ *read_size = want;
- int c = p[elfcpp::EI_CLASS];
- if (c == elfcpp::ELFCLASSNONE)
- {
- gold_error(_("%s: invalid ELF class 0"), name.c_str());
- return NULL;
- }
- else if (c != elfcpp::ELFCLASS32
- && c != elfcpp::ELFCLASS64)
- {
- gold_error(_("%s: unsupported ELF class %d"), name.c_str(), c);
- return NULL;
- }
+ return elfcpp::Elf_recognizer::is_elf_file(p, want);
+}
- int d = p[elfcpp::EI_DATA];
- if (d == elfcpp::ELFDATANONE)
- {
- gold_error(_("%s: invalid ELF data encoding"), name.c_str());
- return NULL;
- }
- else if (d != elfcpp::ELFDATA2LSB
- && d != elfcpp::ELFDATA2MSB)
+// Read an ELF file and return the appropriate instance of Object.
+
+Object*
+make_elf_object(const std::string& name, Input_file* input_file, off_t offset,
+ const unsigned char* p, section_offset_type bytes,
+ bool* punconfigured)
+{
+ if (punconfigured != NULL)
+ *punconfigured = false;
+
+ std::string error;
+ bool big_endian = false;
+ int size = 0;
+ if (!elfcpp::Elf_recognizer::is_valid_header(p, bytes, &size,
+ &big_endian, &error))
{
- gold_error(_("%s: unsupported ELF data encoding %d"), name.c_str(), d);
+ gold_error(_("%s: %s"), name.c_str(), error.c_str());
return NULL;
}
- bool big_endian = d == elfcpp::ELFDATA2MSB;
-
- if (c == elfcpp::ELFCLASS32)
+ if (size == 32)
{
- if (bytes < elfcpp::Elf_sizes<32>::ehdr_size)
- {
- gold_error(_("%s: ELF file too short"), name.c_str());
- return NULL;
- }
if (big_endian)
{
#ifdef HAVE_TARGET_32_BIG
elfcpp::Ehdr<32, true> ehdr(p);
return make_elf_sized_object<32, true>(name, input_file,
- offset, ehdr);
+ offset, ehdr, punconfigured);
#else
- gold_error(_("%s: not configured to support "
- "32-bit big-endian object"),
- name.c_str());
+ if (punconfigured != NULL)
+ *punconfigured = true;
+ else
+ gold_error(_("%s: not configured to support "
+ "32-bit big-endian object"),
+ name.c_str());
return NULL;
#endif
}
#ifdef HAVE_TARGET_32_LITTLE
elfcpp::Ehdr<32, false> ehdr(p);
return make_elf_sized_object<32, false>(name, input_file,
- offset, ehdr);
+ offset, ehdr, punconfigured);
#else
- gold_error(_("%s: not configured to support "
- "32-bit little-endian object"),
- name.c_str());
+ if (punconfigured != NULL)
+ *punconfigured = true;
+ else
+ gold_error(_("%s: not configured to support "
+ "32-bit little-endian object"),
+ name.c_str());
return NULL;
#endif
}
}
- else
+ else if (size == 64)
{
- if (bytes < elfcpp::Elf_sizes<32>::ehdr_size)
- {
- gold_error(_("%s: ELF file too short"), name.c_str());
- return NULL;
- }
if (big_endian)
{
#ifdef HAVE_TARGET_64_BIG
elfcpp::Ehdr<64, true> ehdr(p);
return make_elf_sized_object<64, true>(name, input_file,
- offset, ehdr);
+ offset, ehdr, punconfigured);
#else
- gold_error(_("%s: not configured to support "
- "64-bit big-endian object"),
- name.c_str());
+ if (punconfigured != NULL)
+ *punconfigured = true;
+ else
+ gold_error(_("%s: not configured to support "
+ "64-bit big-endian object"),
+ name.c_str());
return NULL;
#endif
}
#ifdef HAVE_TARGET_64_LITTLE
elfcpp::Ehdr<64, false> ehdr(p);
return make_elf_sized_object<64, false>(name, input_file,
- offset, ehdr);
+ offset, ehdr, punconfigured);
#else
- gold_error(_("%s: not configured to support "
- "64-bit little-endian object"),
- name.c_str());
+ if (punconfigured != NULL)
+ *punconfigured = true;
+ else
+ gold_error(_("%s: not configured to support "
+ "64-bit little-endian object"),
+ name.c_str());
return NULL;
#endif
}
}
+ else
+ gold_unreachable();
}
-// Instantiate the templates we need. We could use the configure
-// script to restrict this to only the ones for implemented targets.
+// Instantiate the templates we need.
+
+#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
+template
+void
+Relobj::initialize_input_to_output_map<64>(unsigned int shndx,
+ elfcpp::Elf_types<64>::Elf_Addr starting_address,
+ Unordered_map<section_offset_type,
+ elfcpp::Elf_types<64>::Elf_Addr>* output_addresses) const;
+#endif
+
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
+template
+void
+Relobj::initialize_input_to_output_map<32>(unsigned int shndx,
+ elfcpp::Elf_types<32>::Elf_Addr starting_address,
+ Unordered_map<section_offset_type,
+ elfcpp::Elf_types<32>::Elf_Addr>* output_addresses) const;
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Object::read_section_data<32, false>(elfcpp::Elf_file<32, false, Object>*,
+ Read_symbols_data*);
+template
+const unsigned char*
+Object::find_shdr<32,false>(const unsigned char*, const char*, const char*,
+ section_size_type, const unsigned char*) const;
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+void
+Object::read_section_data<32, true>(elfcpp::Elf_file<32, true, Object>*,
+ Read_symbols_data*);
+template
+const unsigned char*
+Object::find_shdr<32,true>(const unsigned char*, const char*, const char*,
+ section_size_type, const unsigned char*) const;
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+void
+Object::read_section_data<64, false>(elfcpp::Elf_file<64, false, Object>*,
+ Read_symbols_data*);
+template
+const unsigned char*
+Object::find_shdr<64,false>(const unsigned char*, const char*, const char*,
+ section_size_type, const unsigned char*) const;
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+void
+Object::read_section_data<64, true>(elfcpp::Elf_file<64, true, Object>*,
+ Read_symbols_data*);
+template
+const unsigned char*
+Object::find_shdr<64,true>(const unsigned char*, const char*, const char*,
+ section_size_type, const unsigned char*) const;
+#endif
#ifdef HAVE_TARGET_32_LITTLE
template
class Sized_relobj<32, false>;
+
+template
+class Sized_relobj_file<32, false>;
#endif
#ifdef HAVE_TARGET_32_BIG
template
class Sized_relobj<32, true>;
+
+template
+class Sized_relobj_file<32, true>;
#endif
#ifdef HAVE_TARGET_64_LITTLE
template
class Sized_relobj<64, false>;
+
+template
+class Sized_relobj_file<64, false>;
#endif
#ifdef HAVE_TARGET_64_BIG
template
class Sized_relobj<64, true>;
+
+template
+class Sized_relobj_file<64, true>;
#endif
#ifdef HAVE_TARGET_32_LITTLE
struct Relocate_info<64, true>;
#endif
+#ifdef HAVE_TARGET_32_LITTLE
+template
+void
+Xindex::initialize_symtab_xindex<32, false>(Object*, unsigned int);
+
+template
+void
+Xindex::read_symtab_xindex<32, false>(Object*, unsigned int,
+ const unsigned char*);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+void
+Xindex::initialize_symtab_xindex<32, true>(Object*, unsigned int);
+
+template
+void
+Xindex::read_symtab_xindex<32, true>(Object*, unsigned int,
+ const unsigned char*);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+void
+Xindex::initialize_symtab_xindex<64, false>(Object*, unsigned int);
+
+template
+void
+Xindex::read_symtab_xindex<64, false>(Object*, unsigned int,
+ const unsigned char*);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+void
+Xindex::initialize_symtab_xindex<64, true>(Object*, unsigned int);
+
+template
+void
+Xindex::read_symtab_xindex<64, true>(Object*, unsigned int,
+ const unsigned char*);
+#endif
+
+#ifdef HAVE_TARGET_32_LITTLE
+template
+Compressed_section_map*
+build_compressed_section_map<32, false>(const unsigned char*, unsigned int,
+ const char*, section_size_type,
+ Object*, bool);
+#endif
+
+#ifdef HAVE_TARGET_32_BIG
+template
+Compressed_section_map*
+build_compressed_section_map<32, true>(const unsigned char*, unsigned int,
+ const char*, section_size_type,
+ Object*, bool);
+#endif
+
+#ifdef HAVE_TARGET_64_LITTLE
+template
+Compressed_section_map*
+build_compressed_section_map<64, false>(const unsigned char*, unsigned int,
+ const char*, section_size_type,
+ Object*, bool);
+#endif
+
+#ifdef HAVE_TARGET_64_BIG
+template
+Compressed_section_map*
+build_compressed_section_map<64, true>(const unsigned char*, unsigned int,
+ const char*, section_size_type,
+ Object*, bool);
+#endif
+
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff