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.

1 files changed, 25 insertions, 1 deletions

diff --git a/gold/symtab.h b/gold/symtab.h
index 043fb50f..cfd0c73 100644
--- a/gold/symtab.h
+++ b/gold/symtab.h
@@ -43,6 +43,8 @@ class Object;
 class Relobj;
 template<int size, bool big_endian>
 class Sized_relobj;
+template<int size, bool big_endian>
+class Sized_pluginobj;
 class Dynobj;
 template<int size, bool big_endian>
 class Sized_dynobj;
@@ -273,6 +275,18 @@ class Symbol
   set_in_dyn()
   { this->in_dyn_ = true; }
 
+  // Return whether this symbol has been seen in a real ELF object.
+  // (IN_REG will return TRUE if the symbol has been seen in either
+  // a real ELF object or an object claimed by a plugin.)
+  bool
+  in_real_elf() const
+  { return this->in_real_elf_; }
+
+  // Mark this symbol as having been seen in a real ELF object.
+  void
+  set_in_real_elf()
+  { this->in_real_elf_ = true; }
+
   // Return the index of this symbol in the output file symbol table.
   // A value of -1U means that this symbol is not going into the
   // output file.  This starts out as zero, and is set to a non-zero
@@ -871,8 +885,10 @@ class Symbol
   bool is_forced_local_ : 1;
   // True if the field u_.from_object.shndx is an ordinary section
   // index, not one of the special codes from SHN_LORESERVE to
-  // SHN_HIRESERVE.
+  // SHN_HIRESERVE (bit 31).
   bool is_ordinary_shndx_ : 1;
+  // True if we've seen this symbol in a real ELF object.
+  bool in_real_elf_ : 1;
 };
 
 // The parts of a symbol which are size specific.  Using a template
@@ -1139,6 +1155,14 @@ class Symbol_table
 		  typename Sized_relobj<size, big_endian>::Symbols*,
 		  size_t* defined);
 
+  // Add one external symbol from the plugin object OBJ to the symbol table.
+  // Returns a pointer to the resolved symbol in the symbol table.
+  template<int size, bool big_endian>
+  Symbol*
+  add_from_pluginobj(Sized_pluginobj<size, big_endian>* obj,
+                     const char* name, const char* ver,
+                     elfcpp::Sym<size, big_endian>* sym);
+
   // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the
   // symbol table.  SYMS is the symbols.  SYM_NAMES is their names.
   // SYM_NAME_SIZE is the size of SYM_NAMES.  The other parameters are