forked from Imagelibrary/binutils-gdb
Add plugin functionality for link-time optimization (LTO).
include/: * plugin-api.h: New file. gold/: * configure.ac (plugins): Add --enable-plugins option. * configure: Regenerate. * config.in: Regenerate. * Makefile.am (LIBDL): New variable. (CCFILES): Add plugin.cc. (HFILES): Add plugin.h. (ldadd_var): Add LIBDL. * Makefile.in: Regenerate. * archive.cc: Include "plugin.h". (Archive::setup): Don't preread archive symbols when using a plugin. (Archive::get_file_and_offset): Add memsize parameter. Change callers. (Archive::get_elf_object_for_member): Call plugin hooks for claiming files. (Archive::include_member): Add symbols from plugin objects. * archive.h (Archive::get_file_and_offset): Add memsize parameter. * descriptors.cc (Descriptors::open): Check for file descriptors abandoned by plugins. (Descriptors::claim_for_plugin): New function. * descriptors.h (Descriptors::claim_for_plugin): New function. (Open_descriptor::is_claimed): New field. (claim_descriptor_for_plugin): New function. * fileread.cc (File_read::claim_for_plugin): New function. * fileread.h (File_read::claim_for_plugin): New function. (File_read::descriptor): New function. * gold.cc: Include "plugin.h". (queue_initial_tasks): Add task to call plugin hooks for generating new object files. * main.cc: Include "plugin.h". (main): Load plugin libraries. * object.h (Pluginobj): Declare. (Object::pluginobj): New function. (Object::do_pluginobj): New function. (Object::set_target): New function. * options.cc: Include "plugin.h". (General_options::parse_plugin): New function. (General_options::General_options): Initialize plugins_ field. (General_options::add_plugin): New function. * options.h (Plugin_manager): Declare. (General_options): Add --plugin option. (General_options::has_plugins): New function. (General_options::plugins): New function. (General_options::add_plugin): New function. (General_options::plugins_): New field. * plugin.cc: New file. * plugin.h: New file. * readsyms.cc: Include "plugin.h". (Read_symbols::do_read_symbols): Check for archive before checking for ELF file. Call plugin hooks to claim files. * resolve.cc (Symbol_table::resolve): Record when symbol is referenced from a real object file; force override when processing replacement files. * symtab.cc (Symbol::init_fields): Initialize in_real_elf_ field. (Symbol::init_base_object): Likewise. (Symbol::init_base_output_data): Likewise. (Symbol::init_base_output_segment): Likewise. (Symbol::init_base_constant): Likewise. (Symbol::init_base_undefined): Likewise. (Symbol::output_section): Assert that object is not a plugin. (Symbol_table::add_from_pluginobj): New function. (Symbol_table::sized_finalize_symbol): Treat symbols from plugins as undefined. (Symbol_table::sized_write_globals): Likewise. (Symbol_table::add_from_pluginobj): Instantiate template. * symtab.h (Sized_pluginobj): Declare. (Symbol::in_real_elf): New function. (Symbol::set_in_real_elf): New function. (Symbol::in_real_elf_): New field. (Symbol_table::add_from_pluginobj): New function. * testsuite/Makefile.am (AM_CFLAGS): New variable. (LIBDL): New variable. (LDADD): Add LIBDL. (check_PROGRAMS): Add plugin_test_1 and plugin_test_2. (check_SCRIPTS): Add plugin_test_1.sh and plugin_test_2.sh. (check_DATA): Add plugin_test_1.err and plugin_test_2.err. (MOSTLYCLEANFILES): Likewise. * testsuite/Makefile.in: Regenerate. * testsuite/plugin_test.c: New file. * testsuite/plugin_test_1.sh: New file. * testsuite/plugin_test_2.sh: New file.
This commit is contained in:
Cary Coutant
@@ -37,6 +37,7 @@
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#include "symtab.h"
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#include "object.h"
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#include "archive.h"
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#include "plugin.h"
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namespace gold
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{
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@@ -126,6 +127,9 @@ Archive::setup(Input_objects* input_objects)
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&& parameters->options().preread_archive_symbols());
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#ifndef ENABLE_THREADS
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preread_syms = false;
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#else
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if (parameters->options().has_plugins())
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preread_syms = false;
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#endif
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if (preread_syms)
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this->read_all_symbols(input_objects);
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@@ -439,11 +443,11 @@ Archive::end()
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bool
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Archive::get_file_and_offset(off_t off, Input_objects* input_objects,
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Input_file** input_file, off_t* memoff,
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std::string* member_name)
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off_t* memsize, std::string* member_name)
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{
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off_t nested_off;
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this->read_header(off, false, member_name, &nested_off);
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*memsize = this->read_header(off, false, member_name, &nested_off);
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*input_file = this->input_file_;
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*memoff = off + static_cast<off_t>(sizeof(Archive_header));
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@@ -488,8 +492,8 @@ Archive::get_file_and_offset(off_t off, Input_objects* input_objects,
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this->nested_archives_.insert(std::make_pair(*member_name, arch));
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gold_assert(ins.second);
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}
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return arch->get_file_and_offset(nested_off, input_objects,
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input_file, memoff, member_name);
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return arch->get_file_and_offset(nested_off, input_objects, input_file,
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memoff, memsize, member_name);
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}
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// This is an external member of a thin archive. Open the
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@@ -503,6 +507,7 @@ Archive::get_file_and_offset(off_t off, Input_objects* input_objects,
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return false;
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*memoff = 0;
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*memsize = (*input_file)->file().filesize();
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return true;
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}
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@@ -515,11 +520,26 @@ Archive::get_elf_object_for_member(off_t off, Input_objects* input_objects)
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std::string member_name;
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Input_file* input_file;
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off_t memoff;
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off_t memsize;
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if (!this->get_file_and_offset(off, input_objects, &input_file, &memoff,
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&member_name))
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&memsize, &member_name))
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return NULL;
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if (parameters->options().has_plugins())
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{
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Object* obj = parameters->options().plugins()->claim_file(input_file,
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memoff,
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memsize);
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if (obj != NULL)
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{
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// The input file was claimed by a plugin, and its symbols
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// have been provided by the plugin.
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input_file->file().claim_for_plugin();
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return obj;
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}
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}
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off_t filesize = input_file->file().filesize();
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int read_size = elfcpp::Elf_sizes<64>::ehdr_size;
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if (filesize - memoff < read_size)
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@@ -753,6 +773,13 @@ Archive::include_member(Symbol_table* symtab, Layout* layout,
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if (mapfile != NULL)
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mapfile->report_include_archive_member(obj->name(), sym, why);
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Pluginobj* pluginobj = obj->pluginobj();
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if (pluginobj != NULL)
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{
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pluginobj->add_symbols(symtab, layout);
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return;
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}
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if (input_objects->add_object(obj))
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{
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Read_symbols_data sd;
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