From b453c95fd3fa689a6d70e8878848e5d6531e9ac5 Mon Sep 17 00:00:00 2001 From: Geoffrey Keating Date: Sun, 30 May 2004 00:49:06 +0000 Subject: Index: libcpp/ChangeLog 2004-05-29 Geoffrey Keating * symtab.c (ht_create): Set entries_owned. (ht_destroy): Honour entries_owned. (ht_expand): Likewise. (ht_load): New. Index: libcpp/include/ChangeLog 2004-05-29 Geoffrey Keating * symtab.h (struct ht): New field 'entries_owned' (ht_load): New prototype. Index: gcc/ChangeLog 2004-05-29 Geoffrey Keating * gengtype-yacc.y: Add NESTED_PTR token. (option): Record `nested_ptr' option. * gengtype-lex.l: Handle `nested_ptr' keyword. * gengtype.c (walk_type): Process `nested_ptr' option. * gengtype.h (struct nested_ptr_data): New. * doc/gty.texi (GTY Options): Document `nested_ptr' option. * stringpool.c (struct string_pool_data): Make 'entries' point to ht_identifier instead of tree. (gt_pch_save_stringpool): Don't adjust pointers. (gt_pch_restore_stringpool): Call ht_load. From-SVN: r82438 --- gcc/doc/gty.texi | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'gcc/doc/gty.texi') diff --git a/gcc/doc/gty.texi b/gcc/doc/gty.texi index d43feca..c375e24 100644 --- a/gcc/doc/gty.texi +++ b/gcc/doc/gty.texi @@ -291,6 +291,19 @@ this field is always @code{NULL}. This is used to avoid requiring backends to define certain optional structures. It doesn't work with language frontends. +@findex nested_ptr +@item nested_ptr (@var{type}, "@var{to expression}", "@var{from expression}") + +The type machinery expects all pointers to point to the start of an +object. Sometimes for abstraction purposes it's convenient to have +a pointer which points inside an object. So long as it's possible to +convert the original object to and from the pointer, such pointers +can still be used. @var{type} is the type of the original object, +the @var{to expression} returns the pointer given the original object, +and the @var{from expression} returns the original object given +the pointer. The pointer will be available using the @code{%h} +escape. + @findex chain_next @findex chain_prev @item chain_next ("@var{expression}") -- cgit v1.1