libctf, dedup: add deduplicator

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.

1 files changed, 8 insertions, 2 deletions

diff --git a/libctf/ctf-create.c b/libctf/ctf-create.c
index 001e625..35c286c 100644
--- a/libctf/ctf-create.c
+++ b/libctf/ctf-create.c
@@ -546,6 +546,9 @@ ctf_serialize (ctf_file_t *fp)
   nfp->ctf_link_variable_filter = fp->ctf_link_variable_filter;
   nfp->ctf_link_variable_filter_arg = fp->ctf_link_variable_filter_arg;
   nfp->ctf_link_flags = fp->ctf_link_flags;
+  nfp->ctf_dedup_atoms = fp->ctf_dedup_atoms;
+  nfp->ctf_dedup_atoms_alloc = fp->ctf_dedup_atoms_alloc;
+  memcpy (&nfp->ctf_dedup, &fp->ctf_dedup, sizeof (fp->ctf_dedup));
 
   nfp->ctf_snapshot_lu = fp->ctf_snapshots;
 
@@ -571,11 +574,14 @@ ctf_serialize (ctf_file_t *fp)
   fp->ctf_link_in_cu_mapping = NULL;
   fp->ctf_link_out_cu_mapping = NULL;
   fp->ctf_link_type_mapping = NULL;
+  fp->ctf_dedup_atoms = NULL;
+  fp->ctf_dedup_atoms_alloc = NULL;
   fp->ctf_parent_unreffed = 1;
 
   fp->ctf_dvhash = NULL;
   memset (&fp->ctf_dvdefs, 0, sizeof (ctf_list_t));
   memset (fp->ctf_lookups, 0, sizeof (fp->ctf_lookups));
+  memset (&fp->ctf_dedup, 0, sizeof (fp->ctf_dedup));
   fp->ctf_structs.ctn_writable = NULL;
   fp->ctf_unions.ctn_writable = NULL;
   fp->ctf_enums.ctn_writable = NULL;
@@ -878,7 +884,7 @@ clp2 (size_t x)
   return (x + 1);
 }
 
-static ctf_id_t
+ctf_id_t
 ctf_add_encoded (ctf_file_t *fp, uint32_t flag,
 		 const char *name, const ctf_encoding_t *ep, uint32_t kind)
 {
@@ -899,7 +905,7 @@ ctf_add_encoded (ctf_file_t *fp, uint32_t flag,
   return type;
 }
 
-static ctf_id_t
+ctf_id_t
 ctf_add_reftype (ctf_file_t *fp, uint32_t flag, ctf_id_t ref, uint32_t kind)
 {
   ctf_dtdef_t *dtd;