// object.cc -- support for an object file for linking in gold
-// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012
-// 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 "plugin.h"
#include "compressed_output.h"
#include "incremental.h"
+#include "merge.h"
namespace gold
{
// 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.
|| (is_prefix_of(".sdata", name)
&& strstr(name, "personality"))
|| (is_prefix_of(".gnu.linkonce.d", name)
- && strstr(name, "personality")))
+ && strstr(name, "personality"))
+ || (is_prefix_of(".rodata", name)
+ && strstr(name, "nptl_version")))
{
return true;
}
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
unsigned int nsyms = this->local_symbol_count();
for (unsigned int i = 0; i < nsyms; i++)
{
- Local_got_offsets::const_iterator p = this->local_got_offsets_.find(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;
}
}
+// 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>
local_plt_offsets_(),
kept_comdat_sections_(),
has_eh_frame_(false),
- discarded_eh_frame_shndx_(-1U),
+ is_deferred_layout_(false),
deferred_layout_(),
deferred_layout_relocs_(),
- compressed_sections_()
+ output_views_(NULL)
{
this->e_type_ = ehdr.get_e_type();
}
{
elfcpp::Elf_Word sh_type = shdr->get_sh_type();
return ((sh_type == elfcpp::SHT_PROGBITS
- || sh_type == elfcpp::SHT_X86_64_UNWIND)
+ || sh_type == parameters->target().unwind_section_type())
&& (shdr->get_sh_flags() & elfcpp::SHF_ALLOC) != 0);
}
// 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(), so we know
-// that the section name begins with ".zdebug".
+// 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)
{
- // Skip over the ".zdebug" and a quick check for the "_".
- name += 7;
if (*name++ != '_')
return false;
unsigned int shnum,
const char* names,
section_size_type names_size,
- Sized_relobj_file<size, big_endian>* obj)
+ 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 char* name = names + shdr.get_sh_name();
- if (is_compressed_debug_section(name))
+ 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 = get_uncompressed_size(contents, len);
+ 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 (need_decompressed_section(name))
+ 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))
+ uncompressed_size,
+ size, big_endian,
+ shdr.get_sh_flags()))
info.contents = uncompressed_data;
else
delete[] uncompressed_data;
if (this->find_eh_frame(pshdrs, names, sd->section_names_size))
this->has_eh_frame_ = true;
- if (memmem(names, sd->section_names_size, ".zdebug_", 8) != NULL)
- this->compressed_sections_
- = build_compressed_section_map(pshdrs, this->shnum(), names,
- sd->section_names_size, this);
+ 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", 12) == 0
- || memmem(names, sd->section_names_size, "debug_types",
- 13) == 0)));
+ && (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_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);
{
(*omit)[shndx] = true;
- if (is_comdat)
- {
- Relobj* kept_object = kept_section->object();
- if (kept_section->is_comdat())
- {
- // Find the corresponding kept section, and store
- // that info in the discarded section table.
- unsigned int kept_shndx;
- uint64_t kept_size;
- if (kept_section->find_comdat_section(mname, &kept_shndx,
- &kept_size))
- {
- // We don't keep a mapping for this section if
- // it has a different size. The mapping is only
- // used for relocation processing, and we don't
- // want to treat the sections as similar if the
- // sizes are different. Checking the section
- // size is the approach used by the GNU linker.
- if (kept_size == member_shdr.get_sh_size())
- this->set_kept_comdat_section(shndx, kept_object,
- kept_shndx);
- }
- }
- else
- {
- // The existing section is a linkonce section. Add
- // a mapping if there is exactly one section in the
- // group (which is true when COUNT == 2) and if it
- // is the same size.
- if (count == 2
- && (kept_section->linkonce_size()
- == member_shdr.get_sh_size()))
- this->set_kept_comdat_section(shndx, kept_object,
- kept_section->shndx());
- }
- }
+ // 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);
}
}
// 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()
- && kept2->linkonce_size() == sh_size)
- this->set_kept_comdat_section(index, kept2->object(), kept2->shndx());
+ if (kept2->object() != NULL && !kept2->is_comdat())
+ this->set_kept_comdat_section(index, false, 0, sh_size, kept2);
}
else if (!include1)
{
// this linkonce section. We'll handle the simple case where
// the group has only one member section. Otherwise, it's not
// worth the effort.
- unsigned int kept_shndx;
- uint64_t kept_size;
- if (kept1->object() != NULL
- && kept1->is_comdat()
- && kept1->find_single_comdat_section(&kept_shndx, &kept_size)
- && kept_size == sh_size)
- this->set_kept_comdat_section(index, kept1->object(), kept_shndx);
+ if (kept1->object() != NULL && kept1->is_comdat())
+ this->set_kept_comdat_section(index, false, 0, sh_size, kept1);
}
else
{
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,
- reloc_shndx, reloc_type, &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)
&offset);
this->output_sections()[shndx] = os;
if (os == NULL || offset == -1)
- {
- // An object can contain at most one section holding exception
- // frame information.
- gold_assert(this->discarded_eh_frame_shndx_ == -1U);
- this->discarded_eh_frame_shndx_ = shndx;
- this->section_offsets()[shndx] = invalid_address;
- }
+ this->section_offsets()[shndx] = invalid_address;
else
this->section_offsets()[shndx] = convert_types<Address, off_t>(offset);
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
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? */
{
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.
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() >= 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 (!is_pass_two)
{
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 (shdr.get_sh_type() == elfcpp::SHT_GROUP)
+ if (sh_type == elfcpp::SHT_GROUP)
{
if (!this->include_section_group(symtab, layout, i, name,
shdrs, pnames,
Incremental_inputs* incremental_inputs = layout->incremental_inputs();
if (incremental_inputs != NULL
&& !discard
- && can_incremental_update(shdr.get_sh_type()))
+ && can_incremental_update(sh_type))
{
off_t sh_size = shdr.get_sh_size();
section_size_type uncompressed_size;
{
if (this->is_section_name_included(name)
|| layout->keep_input_section (this, name)
- || shdr.get_sh_type() == elfcpp::SHT_INIT_ARRAY
- || shdr.get_sh_type() == elfcpp::SHT_FINI_ARRAY)
+ || sh_type == elfcpp::SHT_INIT_ARRAY
+ || sh_type == elfcpp::SHT_FINI_ARRAY)
{
- symtab->gc()->worklist().push(Section_id(this, i));
+ symtab->gc()->worklist().push_back(Section_id(this, i));
}
// If the section name XXX can be represented as a C identifier
// it cannot be discarded if there are references to
// reloc sections and process them later. Garbage collection is
// not triggered when relocatable code is desired.
if (emit_relocs
- && (shdr.get_sh_type() == elfcpp::SHT_REL
- || shdr.get_sh_type() == elfcpp::SHT_RELA))
+ && (sh_type == elfcpp::SHT_REL
+ || sh_type == elfcpp::SHT_RELA))
{
reloc_sections.push_back(i);
continue;
}
- if (relocatable && shdr.get_sh_type() == elfcpp::SHT_GROUP)
+ if (relocatable && sh_type == elfcpp::SHT_GROUP)
continue;
// The .eh_frame section is special. It holds exception frame
// sections so that the exception frame reader can reliably
// determine which sections are being discarded, and discard the
// corresponding information.
- if (!relocatable
- && strcmp(name, ".eh_frame") == 0
- && this->check_eh_frame_flags(&shdr))
+ if (this->check_eh_frame_flags(&shdr)
+ && strcmp(name, ".eh_frame") == 0)
{
- if (is_pass_one)
+ // If the target has a special unwind section type, let's
+ // canonicalize it here.
+ sh_type = unwind_section_type;
+ if (!relocatable)
{
- out_sections[i] = reinterpret_cast<Output_section*>(1);
- out_section_offsets[i] = invalid_address;
+ 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;
}
- else if (should_defer_layout)
- this->deferred_layout_.push_back(Deferred_layout(i, name,
- pshdrs,
- reloc_shndx[i],
- reloc_type[i]));
- else
- eh_frame_sections.push_back(i);
- continue;
}
if (is_pass_two && parameters->options().gc_sections())
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'"
+ 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(),
}
// Defer layout here if input files are claimed by plugins. When gc
- // is turned on this function is called twice. For the second call
- // should_defer_layout should be false.
- if (should_defer_layout && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC))
+ // 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))
{
- gold_assert(!is_pass_two);
- this->deferred_layout_.push_back(Deferred_layout(i, name,
+ this->deferred_layout_.push_back(Deferred_layout(i, name, sh_type,
pshdrs,
reloc_shndx[i],
reloc_type[i]));
{
// When garbage collection is switched on the actual layout
// only happens in the second call.
- this->layout_section(layout, i, name, shdr, reloc_shndx[i],
+ this->layout_section(layout, i, name, shdr, sh_type, reloc_shndx[i],
reloc_type[i]);
// When generating a .gdb_index section, we do additional
debug_types_sections.push_back(i);
}
}
+
+ /* 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();
+ }
+ }
}
if (!is_pass_two)
- layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags, this);
+ {
+ layout->merge_gnu_properties(this);
+ layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags, this);
+ }
+
+ // 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)
+ {
+ 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
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, pshdr, 0, elfcpp::SHT_NULL));
+ 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;
out_section_offsets[i] = invalid_address;
}
- // Handle the .eh_frame sections at the end.
- 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)
- {
- 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 building a .gdb_index section, scan the .debug_info and
// .debug_types sections.
gold_assert(!is_pass_one
// Reading the symbols again here may be slow.
Read_symbols_data sd;
- this->read_symbols(&sd);
+ this->base_read_symbols(&sd);
this->layout_eh_frame_section(layout,
sd.symbols->data(),
sd.symbols_size,
continue;
this->layout_section(layout, deferred->shndx_, deferred->name_.c_str(),
- shdr, deferred->reloc_shndx_,
+ shdr, shdr.get_sh_type(), deferred->reloc_shndx_,
deferred->reloc_type_);
}
void
Sized_relobj_file<size, big_endian>::do_add_symbols(Symbol_table* symtab,
Read_symbols_data* sd,
- Layout*)
+ Layout* layout)
{
if (sd->symbols == NULL)
{
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,
// Loop over the local symbols.
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;
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);
// Decide whether this symbol should go into the output file.
- if ((shndx < shnum && out_sections[shndx] == NULL)
- || shndx == this->discarded_eh_frame_shndx_)
+ 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;
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
// - the symbol has a name.
//
// We do not discard a symbol if it needs a dynamic symbol entry.
- if (discard_locals
+ 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()
// This is a SHF_MERGE section or one which otherwise
// requires special handling.
- if (shndx == this->discarded_eh_frame_shndx_)
+ if (os->order() == ORDER_EHFRAME)
{
- // This local symbol belongs to a discarded .eh_frame
- // section. Just treat it like the case in which
+ // 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;
{
// This is not a section symbol. We can determine
// the final value now.
- lv_out->set_output_value(
- os->output_address(this, shndx, lv_in->input_value()));
+ 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))
{
os->find_relaxed_input_section(this, shndx);
if (posd != NULL)
{
- Address relocatable_link_adjustment =
- relocatable ? os->address() : 0;
- lv_out->set_output_value(posd->address()
- - relocatable_link_adjustment);
+ uint64_t value = posd->address();
+ if (relocatable)
+ value -= os->address();
+ lv_out->set_output_value(value);
}
else
lv_out->set_output_value(os->address());
lv_out->set_merged_symbol_value(msv);
}
}
- else if (lv_in->is_tls_symbol())
+ 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());
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:
dyn_oview = of->get_output_view(this->local_dynsym_offset_,
dyn_output_size);
- const Output_sections out_sections(this->output_sections());
+ const Output_sections& out_sections(this->output_sections());
gold_assert(this->local_values_.size() == loccount);
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_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());
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(this->local_values_[i].value(this, 0));
+ 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());
&& (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
typename Sized_relobj_file<size, big_endian>::Address
Sized_relobj_file<size, big_endian>::map_to_kept_section(
unsigned int shndx,
- bool* found) const
+ std::string& section_name,
+ bool* pfound) const
{
- Relobj* kept_object;
- unsigned int kept_shndx;
- if (this->get_kept_comdat_section(shndx, &kept_object, &kept_shndx))
- {
- 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)
+ 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
{
- *found = true;
- return os->address() + offset;
+ 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;
+ }
}
}
- *found = false;
+ *pfound = false;
return 0;
}
+// Look for a kept section corresponding to the given discarded section,
+// and return its object file.
+
+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;
+}
+
+// Return the name of symbol SYMNDX.
+
+template<int size, bool big_endian>
+const char*
+Sized_relobj_file<size, big_endian>::get_symbol_name(unsigned int symndx)
+{
+ if (this->symtab_shndx_ == 0)
+ return NULL;
+
+ 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 unsigned char* p = symbols + symndx * This::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>
// to the size. Set *IS_NEW to true if the contents need to be freed
// by the caller.
-template<int size, bool big_endian>
const unsigned char*
-Sized_relobj_file<size, big_endian>::do_decompressed_section_contents(
+Object::decompressed_section_contents(
unsigned int shndx,
section_size_type* plen,
- bool* is_new)
+ bool* is_new,
+ uint64_t* palign)
{
section_size_type buffer_size;
const unsigned char* buffer = this->do_section_contents(shndx, &buffer_size,
{
*plen = uncompressed_size;
*is_new = false;
+ if (palign != NULL)
+ *palign = p->second.addralign;
return p->second.contents;
}
if (!decompress_input_section(buffer,
buffer_size,
uncompressed_data,
- uncompressed_size))
+ uncompressed_size,
+ elfsize(),
+ is_big_endian(),
+ p->second.flag))
this->error(_("could not decompress section %s"),
this->do_section_name(shndx).c_str());
// 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.
-template<int size, bool big_endian>
void
-Sized_relobj_file<size, big_endian>::do_discard_decompressed_sections()
+Object::discard_decompressed_sections()
{
if (this->compressed_sections_ == NULL)
return;
Dynobj* dynobj = static_cast<Dynobj*>(obj);
const char* soname = dynobj->soname();
- std::pair<Unordered_set<std::string>::iterator, bool> ins =
- this->sonames_.insert(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;
}
ret += ":";
ret += info.source_file;
}
- size_t len = info.enclosing_symbol_name.length() + 100;
- char* buf = new char[len];
- snprintf(buf, len, _(":function %s"),
- info.enclosing_symbol_name.c_str());
- ret += buf;
- delete[] buf;
+ ret += ":";
+ if (info.enclosing_symbol_type == elfcpp::STT_FUNC)
+ ret += _("function ");
+ ret += info.enclosing_symbol_name;
return ret;
}
// 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
#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
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