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libctf: generalize the ref system

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Despite the removal of the separate movable ref list, the ref system as
a whole is more than complex enough to be worth generalizing now that
we are adding different kinds of ref.

Refs now are lists of uint32_t * which can be updated through the
pointer for all entries in the list and moved to new sites for all
pointers in a given range: they are no longer references to string
offsets in particular and can be references to other uint32_t-sized
things instead (note that ctf_id_t is a typedef to a uint32_t).

ctf-string.c has been adjusted accordingly (the adjustments are tiny,
more or less just turning a bunch of references to atom into
&atom->csa_refs).
This commit is contained in:
Nick Alcock
2025-01-13 15:04:17 +00:00
parent 69d4f6d74c
commit 9835747b21
5 changed files with 158 additions and 130 deletions
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22
libctf/ctf-impl.h
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@@ -228,13 +228,13 @@ typedef struct ctf_str_atom
int csa_flags; /* CTF_STR_ATOM_* flags. */
} ctf_str_atom_t;
/* The refs of a single string in the atoms table. */
/* A single ref. */
typedef struct ctf_str_atom_ref
typedef struct ctf_ref
{
ctf_list_t caf_list; /* List forward/back pointers. */
uint32_t *caf_ref; /* A single ref to this string. */
} ctf_str_atom_ref_t;
ctf_list_t cre_list; /* List forward/back pointers. */
uint32_t *cre_ref; /* A single ref to this string. */
} ctf_ref_t;
/* A single linker-provided symbol, during symbol addition, possibly before we
have been given external strtab refs. */
@@ -392,7 +392,7 @@ struct ctf_dict
ctf_strs_t ctf_str[2]; /* Array of string table base and bounds. */
ctf_strs_writable_t *ctf_dynstrtab; /* Dynamically allocated string table, if any. */
ctf_dynhash_t *ctf_str_atoms; /* Hash table of ctf_str_atoms_t. */
ctf_dynhash_t *ctf_str_movable_refs; /* Hash table of void * -> ctf_str_atom_ref_movable_t. */
ctf_dynhash_t *ctf_movable_refs; /* Hash table of void * -> ctf_ref_t. */
uint32_t ctf_str_prov_offset; /* Latest provisional offset assigned so far. */
unsigned char *ctf_base; /* CTF file pointer. */
unsigned char *ctf_dynbase; /* Freeable CTF file pointer. */
@@ -765,13 +765,21 @@ extern uint32_t ctf_str_add_no_dedup_ref (ctf_dict_t *, const char *,
uint32_t *ref);
extern uint32_t ctf_str_add_movable_ref (ctf_dict_t *, const char *,
uint32_t *ref);
extern int ctf_str_move_refs (ctf_dict_t *fp, void *src, size_t len, void *dest);
extern int ctf_str_add_external (ctf_dict_t *, const char *, uint32_t offset);
extern void ctf_str_remove_ref (ctf_dict_t *, const char *, uint32_t *ref);
extern void ctf_str_purge_refs (ctf_dict_t *fp);
extern void ctf_str_rollback (ctf_dict_t *, ctf_snapshot_id_t);
extern const ctf_strs_writable_t *ctf_str_write_strtab (ctf_dict_t *);
extern int ctf_init_refs (ctf_dict_t *);
extern void ctf_free_refs (ctf_dict_t *);
extern ctf_ref_t *ctf_create_ref (ctf_dict_t *, ctf_list_t *, uint32_t *ref,
int movable);
extern void ctf_remove_ref (ctf_dict_t *fp, ctf_list_t *, uint32_t *ref);
extern int ctf_move_refs (ctf_dict_t *fp, void *src, size_t len, void *dest);
extern void ctf_purge_ref_list (ctf_dict_t *, ctf_list_t *);
extern void ctf_update_refs (ctf_list_t *, uint32_t value);
extern int ctf_preserialize (ctf_dict_t *fp);
extern void ctf_depreserialize (ctf_dict_t *fp);