// dynobj.cc -- dynamic object support for gold
-// Copyright 2006, 2007, 2008 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.
// object's filename. The only exception is when the dynamic object
// is part of an archive (so the filename is the archive's
// filename). In that case, we use just the dynobj's name-in-archive.
- this->soname_ = this->input_file()->found_name();
- if (this->offset() != 0)
+ if (input_file == NULL)
+ this->soname_ = name;
+ else
{
- std::string::size_type open_paren = this->name().find('(');
- std::string::size_type close_paren = this->name().find(')');
- if (open_paren != std::string::npos && close_paren != std::string::npos)
+ this->soname_ = input_file->found_name();
+ if (this->offset() != 0)
{
- // It's an archive, and name() is of the form 'foo.a(bar.so)'.
- this->soname_ = this->name().substr(open_paren + 1,
- close_paren - (open_paren + 1));
+ std::string::size_type open_paren = this->name().find('(');
+ std::string::size_type close_paren = this->name().find(')');
+ if (open_paren != std::string::npos
+ && close_paren != std::string::npos)
+ {
+ // It's an archive, and name() is of the form 'foo.a(bar.so)'.
+ open_paren += 1;
+ this->soname_ = this->name().substr(open_paren,
+ close_paren - open_paren);
+ }
}
}
}
template<int size, bool big_endian>
void
-Sized_dynobj<size, big_endian>::setup(Target *target)
+Sized_dynobj<size, big_endian>::setup()
{
- this->set_target(target);
const unsigned int shnum = this->elf_file_.shnum();
this->set_shnum(shnum);
}
*pverneed_shndx = -1U;
*pdynamic_shndx = -1U;
+ unsigned int symtab_shndx = 0;
unsigned int xindex_shndx = 0;
unsigned int xindex_link = 0;
const unsigned int shnum = this->shnum();
}
pi = NULL;
break;
+ case elfcpp::SHT_SYMTAB:
+ symtab_shndx = i;
+ pi = NULL;
+ break;
case elfcpp::SHT_GNU_versym:
pi = pversym_shndx;
break;
*pi = i;
}
+
+ // If there is no dynamic symbol table, use the normal symbol table.
+ // On some SVR4 systems, a shared library is stored in an archive.
+ // The version stored in the archive only has a normal symbol table.
+ // It has an SONAME entry which points to another copy in the file
+ // system which has a dynamic symbol table as usual. This is way of
+ // addressing the issues which glibc addresses using GROUP with
+ // libc_nonshared.a.
+ if (this->dynsym_shndx_ == -1U && symtab_shndx != 0)
+ {
+ this->dynsym_shndx_ = symtab_shndx;
+ if (xindex_shndx > 0 && xindex_link == symtab_shndx)
+ {
+ 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);
+ }
+ }
}
// Read the contents of section SHNDX. PSHDRS points to the section
template<int size, bool big_endian>
void
Sized_dynobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
+{
+ this->base_read_symbols(sd);
+}
+
+// Read the symbols and sections from a dynamic object. We read the
+// dynamic symbols, not the normal symbols. This is common code for
+// all target-specific overrides of do_read_symbols().
+
+template<int size, bool big_endian>
+void
+Sized_dynobj<size, big_endian>::base_read_symbols(Read_symbols_data* sd)
{
this->read_section_data(&this->elf_file_, sd);
sd->external_symbols_offset = 0;
sd->symbol_names = NULL;
sd->symbol_names_size = 0;
+ sd->versym = NULL;
+ sd->versym_size = 0;
+ sd->verdef = NULL;
+ sd->verdef_size = 0;
+ sd->verdef_info = 0;
+ sd->verneed = NULL;
+ sd->verneed_size = 0;
+ sd->verneed_info = 0;
+
+ const unsigned char* namesu = sd->section_names->data();
+ const char* names = reinterpret_cast<const char*>(namesu);
+ if (memmem(names, sd->section_names_size, ".zdebug_", 8) != NULL)
+ {
+ 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);
+ }
if (this->dynsym_shndx_ != -1U)
{
// Get the dynamic symbols.
typename This::Shdr dynsymshdr(pshdrs
+ this->dynsym_shndx_ * This::shdr_size);
- gold_assert(dynsymshdr.get_sh_type() == elfcpp::SHT_DYNSYM);
sd->symbols = this->get_lasting_view(dynsymshdr.get_sh_offset(),
dynsymshdr.get_sh_size(), true,
// Lay out the input sections for a dynamic object. We don't want to
// include sections from a dynamic object, so all that we actually do
-// here is check for .gnu.warning sections.
+// here is check for .gnu.warning and .note.GNU-split-stack sections.
template<int size, bool big_endian>
void
const char* name = pnames + shdr.get_sh_name();
this->handle_gnu_warning_section(name, i, symtab);
+ this->handle_split_stack_section(name);
}
delete sd->section_headers;
Version_map version_map;
this->make_version_map(sd, &version_map);
- // If printing symbol counts, we want to track symbols.
-
- if (parameters->options().user_set_print_symbol_counts())
+ // If printing symbol counts or a cross reference table or
+ // preparing for an incremental link, we want to track symbols.
+ if (parameters->options().user_set_print_symbol_counts()
+ || parameters->options().cref()
+ || parameters->incremental())
{
this->symbols_ = new Symbols();
this->symbols_->resize(symcount);
this->clear_view_cache_marks();
}
+template<int size, bool big_endian>
+Archive::Should_include
+Sized_dynobj<size, big_endian>::do_should_include_member(Symbol_table*,
+ Layout*,
+ Read_symbols_data*,
+ std::string*)
+{
+ return Archive::SHOULD_INCLUDE_YES;
+}
+
+// Iterate over global symbols, calling a visitor class V for each.
+
+template<int size, bool big_endian>
+void
+Sized_dynobj<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
+ && sym.get_st_bind() != elfcpp::STB_LOCAL)
+ v->visit(sym_names + sym.get_st_name());
+ }
+}
+
+// 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_dynobj<size, big_endian>::do_for_all_local_got_entries(
+ Got_offset_list::Visitor*) const
+{
+}
+
// Get symbol counts.
template<int size, bool big_endian>
&& (*p)->source() == Symbol::FROM_OBJECT
&& (*p)->object() == this
&& (*p)->is_defined()
- && (*p)->dynsym_index() != -1U)
+ && (*p)->has_dynsym_index())
++count;
*used = count;
}
bucket[bucketpos] = dynsym_index;
}
+ int size = parameters->target().hash_entry_size();
unsigned int hashlen = ((2
+ bucketcount
+ local_dynsym_count
+ dynsym_count)
- * 4);
+ * size / 8);
unsigned char* phash = new unsigned char[hashlen];
- if (parameters->target().is_big_endian())
+ bool big_endian = parameters->target().is_big_endian();
+ if (size == 32)
{
+ if (big_endian)
+ {
#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
- Dynobj::sized_create_elf_hash_table<true>(bucket, chain, phash,
- hashlen);
+ Dynobj::sized_create_elf_hash_table<32, true>(bucket, chain, phash,
+ hashlen);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
+ Dynobj::sized_create_elf_hash_table<32, false>(bucket, chain, phash,
+ hashlen);
#else
- gold_unreachable();
+ gold_unreachable();
#endif
+ }
}
- else
+ else if (size == 64)
{
+ if (big_endian)
+ {
+#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
+ Dynobj::sized_create_elf_hash_table<64, true>(bucket, chain, phash,
+ hashlen);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
- Dynobj::sized_create_elf_hash_table<false>(bucket, chain, phash,
- hashlen);
+ Dynobj::sized_create_elf_hash_table<64, false>(bucket, chain, phash,
+ hashlen);
#else
- gold_unreachable();
+ gold_unreachable();
#endif
+ }
}
+ else
+ gold_unreachable();
*pphash = phash;
*phashlen = hashlen;
// Fill in an ELF hash table.
-template<bool big_endian>
+template<int size, bool big_endian>
void
Dynobj::sized_create_elf_hash_table(const std::vector<uint32_t>& bucket,
const std::vector<uint32_t>& chain,
const unsigned int bucketcount = bucket.size();
const unsigned int chaincount = chain.size();
- elfcpp::Swap<32, big_endian>::writeval(p, bucketcount);
- p += 4;
- elfcpp::Swap<32, big_endian>::writeval(p, chaincount);
- p += 4;
+ elfcpp::Swap<size, big_endian>::writeval(p, bucketcount);
+ p += size / 8;
+ elfcpp::Swap<size, big_endian>::writeval(p, chaincount);
+ p += size / 8;
for (unsigned int i = 0; i < bucketcount; ++i)
{
- elfcpp::Swap<32, big_endian>::writeval(p, bucket[i]);
- p += 4;
+ elfcpp::Swap<size, big_endian>::writeval(p, bucket[i]);
+ p += size / 8;
}
for (unsigned int i = 0; i < chaincount; ++i)
{
- elfcpp::Swap<32, big_endian>::writeval(p, chain[i]);
- p += 4;
+ elfcpp::Swap<size, big_endian>::writeval(p, chain[i]);
+ p += size / 8;
}
gold_assert(static_cast<unsigned int>(p - phash) == hashlen);
{
Symbol* sym = dynsyms[i];
- // FIXME: Should put on unhashed_dynsyms if the symbol is
- // hidden.
- if (sym->is_undefined())
+ if (!sym->needs_dynsym_value()
+ && (sym->is_undefined()
+ || sym->is_from_dynobj()
+ || sym->is_forced_local()))
unhashed_dynsyms.push_back(sym);
else
{
elfcpp::Verdef_write<size, big_endian> vd(pb);
vd.set_vd_version(elfcpp::VER_DEF_CURRENT);
vd.set_vd_flags((this->is_base_ ? elfcpp::VER_FLG_BASE : 0)
- | (this->is_weak_ ? elfcpp::VER_FLG_WEAK : 0));
+ | (this->is_weak_ ? elfcpp::VER_FLG_WEAK : 0)
+ | (this->is_info_ ? elfcpp::VER_FLG_INFO : 0));
vd.set_vd_ndx(this->index());
vd.set_vd_cnt(1 + this->deps_.size());
vd.set_vd_hash(Dynobj::elf_hash(this->name()));
Versions::Versions(const Version_script_info& version_script,
Stringpool* dynpool)
: defs_(), needs_(), version_table_(),
- is_finalized_(false), version_script_(version_script)
+ is_finalized_(false), version_script_(version_script),
+ needs_base_version_(true)
{
- // We always need a base version, so define that first. Nothing
- // explicitly declares itself as part of base, so it doesn't need to
- // be in version_table_.
- if (parameters->options().shared())
- {
- const char* name = parameters->options().soname();
- if (name == NULL)
- name = parameters->options().output_file_name();
- name = dynpool->add(name, false, NULL);
- Verdef* vdbase = new Verdef(name, std::vector<std::string>(),
- true, false, true);
- this->defs_.push_back(vdbase);
- }
-
if (!this->version_script_.empty())
{
// Parse the version script, and insert each declared version into
// defs_ and version_table_.
std::vector<std::string> versions = this->version_script_.get_versions();
+
+ if (this->needs_base_version_ && !versions.empty())
+ this->define_base_version(dynpool);
+
for (size_t k = 0; k < versions.size(); ++k)
{
Stringpool::Key version_key;
Verdef* const vd = new Verdef(
version,
this->version_script_.get_dependencies(version),
- false, false, false);
+ false, false, false, false);
this->defs_.push_back(vd);
Key key(version_key, 0);
this->version_table_.insert(std::make_pair(key, vd));
delete *p;
}
+// Define the base version of a shared library. The base version definition
+// must be the first entry in defs_. We insert it lazily so that defs_ is
+// empty if no symbol versioning is used. Then layout can just drop the
+// version sections.
+
+void
+Versions::define_base_version(Stringpool* dynpool)
+{
+ // If we do any versioning at all, we always need a base version, so
+ // define that first. Nothing explicitly declares itself as part of base,
+ // so it doesn't need to be in version_table_.
+ gold_assert(this->defs_.empty());
+ const char* name = parameters->options().soname();
+ if (name == NULL)
+ name = parameters->options().output_file_name();
+ name = dynpool->add(name, false, NULL);
+ Verdef* vdbase = new Verdef(name, std::vector<std::string>(),
+ true, false, false, true);
+ this->defs_.push_back(vdbase);
+ this->needs_base_version_ = false;
+}
+
// Return the dynamic object which a symbol refers to.
Dynobj*
gold_assert(!this->is_finalized_);
gold_assert(sym->version() != NULL);
+ // A symbol defined as "sym@" is bound to an unspecified base version.
+ if (sym->version()[0] == '\0')
+ return;
+
Stringpool::Key version_key;
const char* version = dynpool->add(sym->version(), false, &version_key);
if (!sym->is_from_dynobj() && !sym->is_copied_from_dynobj())
{
- if (parameters->options().shared())
- this->add_def(sym, version, version_key);
+ this->add_def(dynpool, sym, version, version_key);
}
else
{
// We've found a symbol SYM defined in version VERSION.
void
-Versions::add_def(const Symbol* sym, const char* version,
+Versions::add_def(Stringpool* dynpool, const Symbol* sym, const char* version,
Stringpool::Key version_key)
{
Key k(version_key, 0);
// When creating a regular executable, automatically define
// a new version.
+ if (this->needs_base_version_)
+ this->define_base_version(dynpool);
Verdef* vd = new Verdef(version, std::vector<std::string>(),
- false, false, false);
+ false, false, false, false);
this->defs_.push_back(vd);
ins.first->second = vd;
}
if (vn == NULL)
{
+ // Create base version definition lazily for shared library.
+ if (parameters->options().shared() && this->needs_base_version_)
+ this->define_base_version(dynpool);
+
// We have a new filename.
vn = new Verneed(filename);
this->needs_.push_back(vn);
if (!(*p)->is_symbol_created())
{
Symbol* vsym = symtab->define_as_constant((*p)->name(),
- (*p)->name(), 0, 0,
+ (*p)->name(),
+ Symbol_table::PREDEFINED,
+ 0, 0,
elfcpp::STT_OBJECT,
elfcpp::STB_GLOBAL,
elfcpp::STV_DEFAULT, 0,
false, false);
vsym->set_needs_dynsym_entry();
vsym->set_dynsym_index(dynsym_index);
+ vsym->set_is_default();
++dynsym_index;
syms->push_back(vsym);
// The name is already in the dynamic pool.
Key k;
if (!sym->is_from_dynobj() && !sym->is_copied_from_dynobj())
{
- if (!parameters->options().shared())
- return elfcpp::VER_NDX_GLOBAL;
k = Key(version_key, 0);
}
else
unsigned int version_index;
const char* version = (*p)->version();
if (version == NULL)
- version_index = elfcpp::VER_NDX_GLOBAL;
- else
+ {
+ if ((*p)->is_defined() && !(*p)->is_from_dynobj())
+ version_index = elfcpp::VER_NDX_GLOBAL;
+ else
+ version_index = elfcpp::VER_NDX_LOCAL;
+ }
+ else if (version[0] == '\0')
+ version_index = elfcpp::VER_NDX_GLOBAL;
+ else
version_index = this->version_index(symtab, dynpool, *p);
// If the symbol was defined as foo@V1 instead of foo@@V1, add
// the hidden bit.
- if ((*p)->version() != NULL && !(*p)->is_default())
+ if ((*p)->version() != NULL
+ && (*p)->is_defined()
+ && !(*p)->is_default()
+ && !(*p)->from_dyn())
version_index |= elfcpp::VERSYM_HIDDEN;
elfcpp::Swap<16, big_endian>::writeval(pbuf + (*p)->dynsym_index() * 2,
version_index);
template<int size, bool big_endian>
void
Versions::need_section_contents(const Stringpool* dynpool,
- unsigned char** pp, unsigned int *psize,
- unsigned int *pentries) const
+ unsigned char** pp, unsigned int* psize,
+ unsigned int* pentries) const
{
gold_assert(this->is_finalized_);
gold_assert(!this->needs_.empty());
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