2009-05-26  Basile Starynkevitch  <basile@starynkevitch.net>

	* gcc/doc/plugins.texi
	(Loading plugins): typo.
	(Plugin callbacks): Documented PLUGIN_INFO, PLUGIN_GGC_START,
	PLUGIN_GGC_MARKING, PLUGIN_GGC_END, PLUGIN_REGISTER_GGC_ROOTS.
	(Interacting with the GCC Garbage Collector): Added new section.
	(Giving information about a plugin): Added new section for
	PLUGIN_INFO.
	* gcc/testsuite/gcc.dg/plugin/plugin.exp: Added ggcplug.c test plugin
	with ggcplug-test-1.c for testing PLUGIN_GGC_MARKING etc...
	* gcc/testsuite/gcc.dg/plugin/ggcplug-test-1.c: Added new file.
	* gcc/testsuite/gcc.dg/plugin/ggcplug.c: Added new file.
	* gcc/ggc.h (ggc_register_root_tab): Added declaration.
	* gcc/gcc-plugin.h (PLUGIN_GGC_START, PLUGIN_GGC_MARKING)
	(PLUGIN_GGC_END, PLUGIN_REGISTER_GGC_ROOTS): Added new events.
	(register_callback): Improved comment in declaration.
	* gcc/ggc-common.c (const_ggc_root_tab_t) Added new typedef for
	vectors.
	(extra_root_vec) Added static variable for dynamic roots
	registration.
	(ggc_register_root_tab) Added new routine.
	(ggc_mark_roots) Added iteration inside extra_root_vec, and invoke
	PLUGIN_GGC_MARKING event.
	* gcc/ggc-zone.c: Include plugin.h.
	(ggc_collect): Invoke PLUGIN_GGC_START & PLUGIN_GGC_END events.
	* gcc/ggc-page.c: Include plugin.h.
	(ggc_collect): Invoke PLUGIN_GGC_START & PLUGIN_GGC_END events.
	* gcc/plugin.c (plugin_event_name): added names of PLUGIN_GGC_START,
	PLUGIN_GGC_MARKING, PLUGIN_GGC_END, PLUGIN_REGISTER_GGC_ROOTS
	(register_callback): check lack of callbacks for
	pseudo-events. Added handling of PLUGIN_REGISTER_GGC_ROOTS,
	PLUGIN_GGC_START, PLUGIN_GGC_MARKING, PLUGIN_GGC_END.
	(invoke_plugin_callbacks): Handle PLUGIN_GGC_START,
	PLUGIN_GGC_MARKING, PLUGIN_GGC_END, PLUGIN_REGISTER_GGC_ROOTS.
	* gcc/Makefile.in (ggc-common.o, ggc-zone.o, ggc-page.o): Added
	dependency on plugin.h.
	(plugin.o): Added dependency on ggc.h...

From-SVN: r147878