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authorCary Coutant <ccoutant@google.com>2008-09-19 22:54:57 +0000
committerCary Coutant <ccoutant@google.com>2008-09-19 22:54:57 +0000
commit89fc34211be8b1d74b83e4e2b18cfa4b4cf65ba9 (patch)
treecd5675e9053bb0b9b68d98253003c08bc5e28bb9 /gold/descriptors.h
parent14fc49fb1561bd620e790080ad27ed3890780b42 (diff)
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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.
Diffstat (limited to 'gold/descriptors.h')
-rw-r--r--gold/descriptors.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/gold/descriptors.h b/gold/descriptors.h
index 6a6ab61..359008c 100644
--- a/gold/descriptors.h
+++ b/gold/descriptors.h
@@ -56,6 +56,12 @@ class Descriptors
void
release(int descriptor, bool permanent);
+ // Claim the file descriptor DESCRIPTOR for a plugin. This effectively
+ // removes the descriptor from the pool of linker-managed descriptors,
+ // as the plugin will assume responsibility for closing it.
+ void
+ claim_for_plugin(int descriptor);
+
private:
// Information kept for a descriptor.
struct Open_descriptor
@@ -69,6 +75,8 @@ class Descriptors
bool inuse;
// Whether this is a write descriptor.
bool is_write;
+ // Whether the descriptor has been claimed for a plugin.
+ bool is_claimed;
};
bool
@@ -100,6 +108,10 @@ inline void
release_descriptor(int descriptor, bool permanent)
{ descriptors.release(descriptor, permanent); }
+inline void
+claim_descriptor_for_plugin(int descriptor)
+{ descriptors.claim_for_plugin(descriptor); }
+
} // End namespace gold.
#endif // !defined(GOLD_DESCRIPTORS_H)