invoke.texi (-fdump-class-layout): Document.

invoke.texi (-fdump-class-layout): Document.

gcc:
	* invoke.texi (-fdump-class-layout): Document.
	(-fdump-translation-unit): Use `=' as filename separator.
cp:
	Fix specification and implementation bugs in V3 ABI
	construction vtables.
	* cp-tree.h (flag_dump_class_layout): New flag.
	(BINFO_OVERRIDE_ALONG_VIRTUAL_PATH_P): Remove.
	(BINFO_LOST_PRIMARY_P): New flag.
	(SET_BINFO_NEW_VTABLE_MARKED): Adjust asserts.
	(BINFO_PRIMARY_MARKED_P): Rename to ...
	(BINFO_PRIMARY_P): ... here.
	(binfo_via_virtual): New prototype.
	* decl2.c (flag_dump_class_layout): New flag.
	(cxx_decode_option): Set it. Adjust -fdump-translation-unit to
	use `=' as a file name separator.
	* init.c (dfs_initialize_vtbl_ptrs): Walk into virtual primary
	bases.
	(build_vtbl_address): If this is a virtual primary base, then
	get the vtbl of what it is ultimately primary for.
	* search.c (dfs_skip_nonprimary_vbases_unmarkedp): Adjust
	for BINFO_PRIMARY_P.
	(dfs_skip_nonprimary_vbases_markedp): Likewise.
	(get_shared_vbase_if_not_primary): Likewise.
	(dfs_get_pure_virtuals): Likewise.
	(expand_upcast_fixups): Likewise.
	(fixup_virtual_upcast_offsets): Likewise.
	(dfs_find_vbase_instance): Likewise.
	(find_vbase_instance): Likewise.
	(binfo_from_vbase): Adjust comment to reflect reality.
	(binfo_via_virtual): New function.
	* class.c (VTT_TOP_LEVEL_P, VTT_MARKED_BINFO_P): New macros
	for binfo walking during VTT construction.
	(dfs_mark_primary_bases): Remove.
	(force_canonical_binfo_r): New function.
	(force_canonical_binfo): New function.
	(mark_primary_virtual_base): New function.
	(mark_primary_bases): Walk in inheritance graph order, use
	mark_primary_virtual_base.
	(determine_primary_base): Use some more intermediate variables.
	(dfs_find_final_overrider): Don't check for overriding along a
	virtual path.
	(dfs_modify_vtables): Walk into primary virtual bases too.
	(walk_subobject_offsets): Adjust for BINFO_PRIMARY_P.
	(build_base_fields): Likewise.
	(dfs_set_offset_for_unshared_vbases): Likewise.
	(layout_virtual_bases): Likewise.
	(end_of_class): Likewise.
	(finish_struct_1): Call dump_class_hierarchy, if requested.
	(dfs_get_primary_binfo): Use BINFO_TYPE for binfos.
	(dump_class_hierarchy_r): Add stream parameter. Emit more information.
	(dump_class_hierarchy): Add file parameter. Append to file, if
	required.
	(finish_vtbls): Adjust accumulate_vtbl_inits call.
	Use canonical base for virtual bases.
	(build_vtt): Add more comments. Adjust build_vtt_inits call.
	(build_vtt_inits): Remove VIRTUAL_VTTS_P parm.
	Only set BINFO_VPTR_INDEX on top level. Use VTT_TOP_LEVEL_P,
	VTT_MARKED_BINFO_P for binfo walking. Use canonical vbase for
	virtual VTTs.
	(dfs_build_secondary_vptr_vtt_inits): Extract VTT_TOP_LEVEL_P
	from DATA.  We want virtual primary bases and all bases via virtual.
	Only set BINFO_VPTR_INDEX for top level. Look up from a primary
	virtual base when not a construction vtable.
	(dfs_ctor_vtable_bases_queue_p): New DFS predicate.
	(build_ctor_vtbl_group): Adjust accumulate_vtbl_inits call.
	Use canonical bases when processing virtual bases.
	(accumulate_vtbl_inits): We're interested in any base via a
	virtual path.
	(dfs_accumulate_vtbl_inits): If this is a primary virtual base
	within a construction vtable, determine what is being overridden.
	(build_vtbl_initializer): Add more comments
	(add_vcall_offset_vtbl_entries_1): Adjust comment.
	(build_rtti_vtbl_entries): Check if the base has lost its
	primary.
testsuite:
	* g++.old-deja/g++.abi/primary2.C: New test.
	* g++.old-deja/g++.abi/primary3.C: New test.
	* g++.old-deja/g++.abi/primary4.C: New test.
	* g++.old-deja/g++.abi/primary5.C: New test.
	* g++.old-deja/g++.abi/vtable3.h: New test.
	* g++.old-deja/g++.abi/vtable3a.C: New test.
	* g++.old-deja/g++.abi/vtable3b.C: New test.
	* g++.old-deja/g++.abi/vtable3c.C: New test.
	* g++.old-deja/g++.abi/vtable3d.C: New test.
	* g++.old-deja/g++.abi/vtable3e.C: New test.
	* g++.old-deja/g++.abi/vtable3f.C: New test.
	* g++.old-deja/g++.abi/vtable3g.C: New test.
	* g++.old-deja/g++.abi/vtable3h.C: New test.
	* g++.old-deja/g++.abi/vtable3i.C: New test.
	* g++.old-deja/g++.abi/vtable3j.C: New test.
	* g++.old-deja/g++.oliva/thunk1.C: Remove XFAIL.

From-SVN: r39455