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libctf: CTFv4: core opening (other than the type table)

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This commit modifies the core opening code to handle opening CTFv4 and BTF.
Much of the back-compatibility side is left for later and is currently
untested, as is the type table side of things.

We keep the v3 header (if any) stashed away in ctf_dict_t.ctf_v3_header, for
the sake of the CTF dumper; we "upgrade" the BTF header to CTF (so that the
rest of the code can ignore the distinction, and so that you can do CTFish
things like adding symtypetab entries even to things opened as BTF), but
keep note of the fact that it was opened as BTF in ctf_dict_t.ctf_opened_btf,
so that things like ctf_import can allow for the absence of the various
parent-length fields.

A couple of ctf_dict_t fields are renamed for consistency with the headers'
names for them (ctf_parname becomes ctf_parent_name; ctf_dynparname becomes
ctf_dyn_parent_name; ctf_cuname becomes ctf_cu_name).  Not all users are yet
adjusted.
This commit is contained in:
Nick Alcock
2025-04-24 14:44:12 +01:00
parent 99e9ab4828
commit f7d05ab342
2 changed files with 440 additions and 217 deletions
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17
libctf/ctf-impl.h
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@@ -365,8 +365,11 @@ typedef struct ctf_dedup
struct ctf_dict
{
const ctf_dictops_t *ctf_dictops; /* Version-specific dict operations. */
struct ctf_header *ctf_header; /* The header from this CTF dict. */
ctf_header_t *ctf_header; /* The header from this CTF dict. */
ctf_header_v3_t *ctf_v3_header; /* The header from an upgraded CTF dict. */
unsigned char ctf_openflags; /* Flags the dict had when opened. */
int ctf_opened_btf; /* Whether this dict was pure BTF when
opened. */
ctf_sect_t ctf_data; /* CTF data from object file. */
ctf_sect_t ctf_ext_symtab; /* Symbol table from object file. */
ctf_sect_t ctf_ext_strtab; /* String table from object file. */
@@ -393,7 +396,8 @@ struct ctf_dict
size_t ctf_str_prov_len; /* Length of all unwritten provisional strings. */
unsigned char *ctf_base; /* CTF file pointer. */
unsigned char *ctf_dynbase; /* Freeable CTF file pointer. */
unsigned char *ctf_buf; /* Uncompressed CTF data buffer. */
unsigned char *ctf_buf; /* Uncompressed CTF data buffer, including
CTFv4 header portion. */
size_t ctf_size; /* Size of CTF header + uncompressed data. */
unsigned char *ctf_serializing_buf; /* CTF buffer in mid-serialization. */
size_t ctf_serializing_buf_size; /* Length of that buffer. */
@@ -434,13 +438,12 @@ struct ctf_dict
Counts down. Parent only. */
uint32_t ctf_nprovtypes; /* Number of provisional types (convenience). */
const ctf_dmodel_t *ctf_dmodel; /* Data model pointer (see above). */
const char *ctf_cuname; /* Compilation unit name (if any). */
char *ctf_dyncuname; /* Dynamically allocated name of CU. */
const char *ctf_cu_name; /* Compilation unit name (if any). */
char *ctf_dyn_cu_name; /* Dynamically allocated name of CU. */
struct ctf_dict *ctf_parent; /* Parent CTF dict (if any). */
int ctf_parent_unreffed; /* Parent set by ctf_import_unref? */
const char *ctf_parlabel; /* Label in parent dict (if any). */
const char *ctf_parname; /* Basename of parent (if any). */
char *ctf_dynparname; /* Dynamically allocated name of parent. */
const char *ctf_parent_name; /* Basename of parent (if any). */
char *ctf_dyn_parent_name; /* Dynamically allocated name of parent. */
uint32_t ctf_refcnt; /* Reference count (for parent links). */
uint32_t ctf_flags; /* Libctf flags (see below). */
uint32_t ctf_max_children; /* Max number of child dicts. */