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Change default to discard temporary local symbols in merge sections.
Add --discard-none to keep all local symbols. gold/ PR gold/17498 * object.cc (Sized_relobj_file::do_count_local_symbols): Discard temporary locals in merge sections. * options.cc (General_options::parse_discard_all): New method. (General_options::parse_discard_locals): New method. (General_options::parse_discard_none): New method. (General_options::General_options): Initialize discard_locals_. * options.h (--discard-all): Convert to special option. (--discard-locals): Likewise. (--discard-none): New option. (General_options::discard_all): New method. (General_options::discard_locals): New method. (General_options::discard_sec_merge): New method. (General_options::Discard_locals): New enum. (General_options::discard_locals_): New data member.
This commit is contained in:
Cary Coutant
parent
dc302c0061
commit
cd3c333f43
@ -1,3 +1,21 @@
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2015-06-04 Cary Coutant <ccoutant@gmail.com>
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PR gold/17498
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* object.cc (Sized_relobj_file::do_count_local_symbols): Discard
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temporary locals in merge sections.
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* options.cc (General_options::parse_discard_all): New method.
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(General_options::parse_discard_locals): New method.
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(General_options::parse_discard_none): New method.
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(General_options::General_options): Initialize discard_locals_.
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* options.h (--discard-all): Convert to special option.
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(--discard-locals): Likewise.
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(--discard-none): New option.
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(General_options::discard_all): New method.
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(General_options::discard_locals): New method.
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(General_options::discard_sec_merge): New method.
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(General_options::Discard_locals): New enum.
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(General_options::discard_locals_): New data member.
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2015-06-03 Cary Coutant <cary@google.com>
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* script-sections.cc (Script_sections::Script_sections): Initialize
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@ -2174,6 +2174,7 @@ Sized_relobj_file<size, big_endian>::do_count_local_symbols(Stringpool* pool,
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// Loop over the local symbols.
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const Output_sections& out_sections(this->output_sections());
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std::vector<Address>& out_section_offsets(this->section_offsets());
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unsigned int shnum = this->shnum();
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unsigned int count = 0;
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unsigned int dyncount = 0;
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@ -2182,6 +2183,7 @@ Sized_relobj_file<size, big_endian>::do_count_local_symbols(Stringpool* pool,
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bool strip_all = parameters->options().strip_all();
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bool discard_all = parameters->options().discard_all();
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bool discard_locals = parameters->options().discard_locals();
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bool discard_sec_merge = parameters->options().discard_sec_merge();
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for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
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{
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elfcpp::Sym<size, big_endian> sym(psyms);
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@ -2246,6 +2248,7 @@ Sized_relobj_file<size, big_endian>::do_count_local_symbols(Stringpool* pool,
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continue;
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}
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// By default, discard temporary local symbols in merge sections.
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// If --discard-locals option is used, discard all temporary local
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// symbols. These symbols start with system-specific local label
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// prefixes, typically .L for ELF system. We want to be compatible
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@ -2258,7 +2261,10 @@ Sized_relobj_file<size, big_endian>::do_count_local_symbols(Stringpool* pool,
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// - the symbol has a name.
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//
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// We do not discard a symbol if it needs a dynamic symbol entry.
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if (discard_locals
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if ((discard_locals
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|| (discard_sec_merge
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&& is_ordinary
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&& out_section_offsets[shndx] == invalid_address))
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&& sym.get_st_type() != elfcpp::STT_FILE
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&& !lv.needs_output_dynsym_entry()
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&& lv.may_be_discarded_from_output_symtab()
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@ -345,6 +345,27 @@ General_options::parse_defsym(const char*, const char* arg,
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cmdline->script_options().define_symbol(arg);
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}
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void
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General_options::parse_discard_all(const char*, const char*,
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Command_line*)
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{
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this->discard_locals_ = DISCARD_ALL;
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}
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void
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General_options::parse_discard_locals(const char*, const char*,
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Command_line*)
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{
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this->discard_locals_ = DISCARD_LOCALS;
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}
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void
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General_options::parse_discard_none(const char*, const char*,
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Command_line*)
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{
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this->discard_locals_ = DISCARD_NONE;
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}
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void
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General_options::parse_incremental(const char*, const char*,
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Command_line*)
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@ -927,7 +948,8 @@ General_options::General_options()
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symbols_to_retain_(),
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section_starts_(),
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fix_v4bx_(FIX_V4BX_NONE),
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endianness_(ENDIANNESS_NOT_SET)
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endianness_(ENDIANNESS_NOT_SET),
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discard_locals_(DISCARD_SEC_MERGE)
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{
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// Turn off option registration once construction is complete.
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gold::options::ready_to_register = false;
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@ -739,10 +739,12 @@ class General_options
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N_("Look for violations of the C++ One Definition Rule"),
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N_("Do not look for violations of the C++ One Definition Rule"));
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DEFINE_bool(discard_all, options::TWO_DASHES, 'x', false,
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N_("Delete all local symbols"), NULL);
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DEFINE_bool(discard_locals, options::TWO_DASHES, 'X', false,
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N_("Delete all temporary local symbols"), NULL);
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DEFINE_special(discard_all, options::TWO_DASHES, 'x',
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N_("Delete all local symbols"), NULL);
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DEFINE_special(discard_locals, options::TWO_DASHES, 'X',
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N_("Delete all temporary local symbols"), NULL);
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DEFINE_special(discard_none, options::TWO_DASHES, '\0',
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N_("Keep all local symbols"), NULL);
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DEFINE_bool(dynamic_list_data, options::TWO_DASHES, '\0', false,
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N_("Add data symbols to dynamic symbols"), NULL);
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@ -1526,11 +1528,36 @@ class General_options
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endianness() const
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{ return this->endianness_; }
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bool
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discard_all() const
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{ return this->discard_locals_ == DISCARD_ALL; }
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bool
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discard_locals() const
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{ return this->discard_locals_ == DISCARD_LOCALS; }
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bool
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discard_sec_merge() const
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{ return this->discard_locals_ == DISCARD_SEC_MERGE; }
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private:
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// Don't copy this structure.
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General_options(const General_options&);
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General_options& operator=(const General_options&);
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// What local symbols to discard.
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enum Discard_locals
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{
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// Locals in merge sections (default).
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DISCARD_SEC_MERGE,
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// None (--discard-none).
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DISCARD_NONE,
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// Temporary locals (--discard-locals/-X).
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DISCARD_LOCALS,
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// All locals (--discard-all/-x).
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DISCARD_ALL
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};
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// Whether to mark the stack as executable.
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enum Execstack
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{
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@ -1626,6 +1653,8 @@ class General_options
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Fix_v4bx fix_v4bx_;
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// Endianness.
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Endianness endianness_;
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// What local symbols to discard.
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Discard_locals discard_locals_;
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};
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// The position-dependent options. We use this to store the state of
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