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libctf, dedup: add deduplicator

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This adds the core deduplicator that the ctf_link machinery calls
(possibly repeatedly) to link the CTF sections: it takes an array
of input ctf_file_t's and another array that indicates which entries in
the input array are parents of which other entries, and returns an array
of outputs.  The first output is always the ctf_file_t on which
ctf_link/ctf_dedup/etc was called: the other outputs are child dicts
that have the first output as their parent.

include/
	* ctf-api.h (CTF_LINK_SHARE_DUPLICATED): No longer unimplemented.
libctf/
	* ctf-impl.h (ctf_type_id_key): New, the key in the
	cd_id_to_file_t.
	(ctf_dedup): New, core deduplicator state.
	(ctf_file_t) <ctf_dedup>: New.
	<ctf_dedup_atoms>: New.
	<ctf_dedup_atoms_alloc>: New.
	(ctf_hash_type_id_key): New prototype.
	(ctf_hash_eq_type_id_key): Likewise.
	(ctf_dedup_atoms_init): Likewise.
	* ctf-hash.c (ctf_hash_eq_type_id_key): New.
	(ctf_dedup_atoms_init): Likewise.
	* ctf-create.c (ctf_serialize): Adjusted.
	(ctf_add_encoded): No longer static.
	(ctf_add_reftype): Likewise.
	* ctf-open.c (ctf_file_close): Destroy the
	ctf_dedup_atoms_alloc.
	* ctf-dedup.c: New file.
        * ctf-decls.h [!HAVE_DECL_STPCPY]: Add prototype.
	* configure.ac: Check for stpcpy.
	* Makefile.am: Add it.
	* Makefile.in: Regenerate.
        * config.h.in: Regenerate.
        * configure: Regenerate.
This commit is contained in:
Nick Alcock
2020-06-05 18:35:46 +01:00
parent a9b9870206
commit 0f0c11f7fc
14 changed files with 3401 additions and 24 deletions
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22
libctf/ctf-hash.c
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@@ -117,6 +117,28 @@ ctf_hash_eq_type_key (const void *a, const void *b)
&& (key_a->cltk_idx == key_b->cltk_idx);
}
/* Hash a type_id_key. */
unsigned int
ctf_hash_type_id_key (const void *ptr)
{
ctf_helem_t *hep = (ctf_helem_t *) ptr;
ctf_type_id_key_t *k = (ctf_type_id_key_t *) hep->key;
return htab_hash_pointer ((void *) (uintptr_t) k->ctii_input_num)
+ 59 * htab_hash_pointer ((void *) (uintptr_t) k->ctii_type);
}
int
ctf_hash_eq_type_id_key (const void *a, const void *b)
{
ctf_helem_t *hep_a = (ctf_helem_t *) a;
ctf_helem_t *hep_b = (ctf_helem_t *) b;
ctf_type_id_key_t *key_a = (ctf_type_id_key_t *) hep_a->key;
ctf_type_id_key_t *key_b = (ctf_type_id_key_t *) hep_b->key;
return (key_a->ctii_input_num == key_b->ctii_input_num)
&& (key_a->ctii_type == key_b->ctii_type);
}
/* Hash and eq functions for the dynset. Most of these can just use the
underlying hashtab functions directly. */