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binutils-gdb/libctf/ctf-impl.h
Nick Alcock fd55eae84d libctf: allow the header to change between versions 
libctf supports dynamic upgrading of the type table as file format
versions change, but before now has not supported changes to the CTF
header.  Doing this is complicated by the baroque storage method used:
the CTF header is kept prepended to the rest of the CTF data, just as
when read from the file, and written out from there, and is
endian-flipped in place.

This makes accessing it needlessly hard and makes it almost impossible
to make the header larger if we add fields.  The general storage
machinery around the malloced ctf pointer (the 'ctf_base') is also
overcomplicated: the pointer is sometimes malloced locally and sometimes
assigned from a parameter, so freeing it requires checking to see if
that parameter was used, needlessly coupling ctf_bufopen and
ctf_file_close together.

So split the header out into a new ctf_file_t.ctf_header, which is
written out explicitly: squeeze it out of the CTF buffer whenever we
reallocate it, and use ctf_file_t.ctf_buf to skip past the header when
we do not need to reallocate (when no upgrading or endian-flipping is
required).  We now track whether the CTF base can be freed explicitly
via a new ctf_dynbase pointer which is non-NULL only when freeing is
possible.

With all this done, we can upgrade the header on the fly and add new
fields as desired, via a new upgrade_header function in ctf-open.
As with other forms of upgrading, libctf upgrades older headers
automatically to the latest supported version at open time.

For a first use of this field, we add a new string field cth_cuname, and
a corresponding setter/getter pair ctf_cuname_set and ctf_cuname: this
is used by debuggers to determine whether a CTF section's types relate
to a single compilation unit, or to all compilation units in the
program.  (Types with ambiguous definitions in different CUs have only
one of these types placed in the top-level shared .ctf container: the
rest are placed in much smaller per-CU containers, which have the shared
container as their parent.  Since CTF must be useful in the absence of
DWARF, we store the names of the relevant CUs ourselves, so the debugger
can look them up.)

v5: fix tabdamage.

include/
	* ctf-api.h (ctf_cuname): New function.
	(ctf_cuname_set): Likewise.
	* ctf.h: Improve comment around upgrading, no longer
	implying that v2 is the target of upgrades (it is v3 now).
	(ctf_header_v2_t): New, old-format header for backward
	compatibility.
	(ctf_header_t): Add cth_cuname: this is the first of several
	header changes in format v3.
libctf/
	* ctf-impl.h (ctf_file_t): New fields ctf_header, ctf_dynbase,
	ctf_cuname, ctf_dyncuname: ctf_base and ctf_buf are no longer const.
	* ctf-open.c (ctf_set_base): Preserve the gap between ctf_buf and
	ctf_base: do not assume that it is always sizeof (ctf_header_t).
	Print out ctf_cuname: only print out ctf_parname if set.
	(ctf_free_base): Removed, ctf_base is no longer freed: free
	ctf_dynbase instead.
	(ctf_set_version): Fix spacing.
	(upgrade_header): New, in-place header upgrading.
	(upgrade_types): Rename to...
	(upgrade_types_v1): ... this.  Free ctf_dynbase, not ctf_base.  No
	longer track old and new headers separately.  No longer allow for
	header sizes explicitly: squeeze the headers out on upgrade (they
	are preserved in fp->ctf_header).  Set ctf_dynbase, ctf_base and
	ctf_buf explicitly.  Use ctf_free, not ctf_free_base.
	(upgrade_types): New, also handle ctf_parmax updating.
	(flip_header): Flip ctf_cuname.
	(flip_types): Flip BUF explicitly rather than deriving BUF from
	BASE.
	(ctf_bufopen): Store the header in fp->ctf_header.  Correct minimum
	required alignment of objtoff and funcoff.  No longer store it in
	the ctf_buf unless that buf is derived unmodified from the input.
	Set ctf_dynbase where ctf_base is dynamically allocated. Drop locals
	that duplicate fields in ctf_file: move allocation of ctf_file
	further up instead.  Call upgrade_header as needed.  Move
	version-specific ctf_parmax initialization into upgrade_types.  More
	concise error handling.
	(ctf_file_close): No longer test for null pointers before freeing.
	Free ctf_dyncuname, ctf_dynbase, and ctf_header.  Do not call
	ctf_free_base.
	(ctf_cuname): New.
	(ctf_cuname_set): New.
	* ctf-create.c (ctf_update): Populate ctf_cuname.
	(ctf_gzwrite): Write out the header explicitly.  Remove obsolescent
	comment.
	(ctf_write): Likewise.
	(ctf_compress_write): Get the header from ctf_header, not ctf_base.
	Fix the compression length: fp->ctf_size never counted the CTF
	header.  Simplify the compress call accordingly.
2019-10-03 17:04:55 +01:00

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/* Implementation header.
Copyright (C) 2019 Free Software Foundation, Inc.
This file is part of libctf.
libctf is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not see
<http://www.gnu.org/licenses/>. */
#ifndef _CTF_IMPL_H
#define _CTF_IMPL_H
#include "config.h"
#include <errno.h>
#include "ctf-decls.h"
#include <ctf-api.h>
#include <sys/types.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <limits.h>
#include <ctype.h>
#include <elf.h>
#include <bfd.h>
#ifdef __cplusplus
extern "C"
{
#endif
/* Compiler attributes. */
#if defined (__GNUC__)
/* GCC. We assume that all compilers claiming to be GCC support sufficiently
many GCC attributes that the code below works. If some non-GCC compilers
masquerading as GCC in fact do not implement these attributes, version checks
may be required. */
/* We use the _libctf_*_ pattern to avoid clashes with any future attribute
macros glibc may introduce, which have names of the pattern
__attribute_blah__. */
#define _libctf_printflike_(string_index,first_to_check) \
__attribute__ ((__format__ (__printf__, (string_index), (first_to_check))))
#define _libctf_unlikely_(x) __builtin_expect ((x), 0)
#define _libctf_unused_ __attribute__ ((__unused__))
#define _libctf_malloc_ __attribute__((__malloc__))
#endif
/* libctf in-memory state. */
typedef struct ctf_fixed_hash ctf_hash_t; /* Private to ctf-hash.c. */
typedef struct ctf_dynhash ctf_dynhash_t; /* Private to ctf-hash.c. */
typedef struct ctf_strs
{
const char *cts_strs; /* Base address of string table. */
size_t cts_len; /* Size of string table in bytes. */
} ctf_strs_t;
typedef struct ctf_strs_writable
{
char *cts_strs; /* Base address of string table. */
size_t cts_len; /* Size of string table in bytes. */
} ctf_strs_writable_t;
typedef struct ctf_dmodel
{
const char *ctd_name; /* Data model name. */
int ctd_code; /* Data model code. */
size_t ctd_pointer; /* Size of void * in bytes. */
size_t ctd_char; /* Size of char in bytes. */
size_t ctd_short; /* Size of short in bytes. */
size_t ctd_int; /* Size of int in bytes. */
size_t ctd_long; /* Size of long in bytes. */
} ctf_dmodel_t;
typedef struct ctf_lookup
{
const char *ctl_prefix; /* String prefix for this lookup. */
size_t ctl_len; /* Length of prefix string in bytes. */
ctf_hash_t *ctl_hash; /* Pointer to hash table for lookup. */
} ctf_lookup_t;
typedef struct ctf_fileops
{
uint32_t (*ctfo_get_kind) (uint32_t);
uint32_t (*ctfo_get_root) (uint32_t);
uint32_t (*ctfo_get_vlen) (uint32_t);
ssize_t (*ctfo_get_ctt_size) (const ctf_file_t *, const ctf_type_t *,
ssize_t *, ssize_t *);
ssize_t (*ctfo_get_vbytes) (unsigned short, ssize_t, size_t);
} ctf_fileops_t;
typedef struct ctf_list
{
struct ctf_list *l_prev; /* Previous pointer or tail pointer. */
struct ctf_list *l_next; /* Next pointer or head pointer. */
} ctf_list_t;
typedef enum
{
CTF_PREC_BASE,
CTF_PREC_POINTER,
CTF_PREC_ARRAY,
CTF_PREC_FUNCTION,
CTF_PREC_MAX
} ctf_decl_prec_t;
typedef struct ctf_decl_node
{
ctf_list_t cd_list; /* Linked list pointers. */
ctf_id_t cd_type; /* Type identifier. */
uint32_t cd_kind; /* Type kind. */
uint32_t cd_n; /* Type dimension if array. */
} ctf_decl_node_t;
typedef struct ctf_decl
{
ctf_list_t cd_nodes[CTF_PREC_MAX]; /* Declaration node stacks. */
int cd_order[CTF_PREC_MAX]; /* Storage order of decls. */
ctf_decl_prec_t cd_qualp; /* Qualifier precision. */
ctf_decl_prec_t cd_ordp; /* Ordered precision. */
char *cd_buf; /* Buffer for output. */
int cd_err; /* Saved error value. */
int cd_enomem; /* Nonzero if OOM during printing. */
} ctf_decl_t;
typedef struct ctf_dmdef
{
ctf_list_t dmd_list; /* List forward/back pointers. */
char *dmd_name; /* Name of this member. */
ctf_id_t dmd_type; /* Type of this member (for sou). */
unsigned long dmd_offset; /* Offset of this member in bits (for sou). */
int dmd_value; /* Value of this member (for enum). */
} ctf_dmdef_t;
typedef struct ctf_dtdef
{
ctf_list_t dtd_list; /* List forward/back pointers. */
char *dtd_name; /* Name associated with definition (if any). */
ctf_id_t dtd_type; /* Type identifier for this definition. */
ctf_type_t dtd_data; /* Type node: name left unpopulated. */
union
{
ctf_list_t dtu_members; /* struct, union, or enum */
ctf_arinfo_t dtu_arr; /* array */
ctf_encoding_t dtu_enc; /* integer or float */
ctf_id_t *dtu_argv; /* function */
ctf_slice_t dtu_slice; /* slice */
} dtd_u;
} ctf_dtdef_t;
typedef struct ctf_dvdef
{
ctf_list_t dvd_list; /* List forward/back pointers. */
char *dvd_name; /* Name associated with variable. */
ctf_id_t dvd_type; /* Type of variable. */
unsigned long dvd_snapshots; /* Snapshot count when inserted. */
} ctf_dvdef_t;
typedef struct ctf_bundle
{
ctf_file_t *ctb_file; /* CTF container handle. */
ctf_id_t ctb_type; /* CTF type identifier. */
ctf_dtdef_t *ctb_dtd; /* CTF dynamic type definition (if any). */
} ctf_bundle_t;
/* Atoms associate strings with a list of the CTF items that reference that
string, so that ctf_update() can instantiate all the strings using the
ctf_str_atoms and then reassociate them with the real string later.
Strings can be interned into ctf_str_atom without having refs associated
with them, for values that are returned to callers, etc. Items are only
removed from this table on ctf_close(), but on every ctf_update(), all the
csa_refs in all entries are purged. */
typedef struct ctf_str_atom
{
const char *csa_str; /* Backpointer to string (hash key). */
ctf_list_t csa_refs; /* This string's refs. */
unsigned long csa_snapshot_id; /* Snapshot ID at time of creation. */
} ctf_str_atom_t;
/* The refs of a single string in the atoms table. */
typedef struct ctf_str_atom_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;
/* The ctf_file is the structure used to represent a CTF container to library
clients, who see it only as an opaque pointer. Modifications can therefore
be made freely to this structure without regard to client versioning. The
ctf_file_t typedef appears in <ctf-api.h> and declares a forward tag.
NOTE: ctf_update() requires that everything inside of ctf_file either be an
immediate value, a pointer to dynamically allocated data *outside* of the
ctf_file itself, or a pointer to statically allocated data. If you add a
pointer to ctf_file that points to something within the ctf_file itself,
you must make corresponding changes to ctf_update(). */
struct ctf_file
{
const ctf_fileops_t *ctf_fileops; /* Version-specific file operations. */
struct ctf_header *ctf_header; /* The header from this CTF file. */
ctf_sect_t ctf_data; /* CTF data from object file. */
ctf_sect_t ctf_symtab; /* Symbol table from object file. */
ctf_sect_t ctf_strtab; /* String table from object file. */
void *ctf_data_mmapped; /* CTF data we mmapped, to free later. */
size_t ctf_data_mmapped_len; /* Length of CTF data we mmapped. */
ctf_hash_t *ctf_structs; /* Hash table of struct types. */
ctf_hash_t *ctf_unions; /* Hash table of union types. */
ctf_hash_t *ctf_enums; /* Hash table of enum types. */
ctf_hash_t *ctf_names; /* Hash table of remaining type names. */
ctf_lookup_t ctf_lookups[5]; /* Pointers to hashes for name lookup. */
ctf_strs_t ctf_str[2]; /* Array of string table base and bounds. */
ctf_dynhash_t *ctf_str_atoms; /* Hash table of ctf_str_atoms_t. */
uint64_t ctf_str_num_refs; /* Number of refs to cts_str_atoms. */
unsigned char *ctf_base; /* CTF file pointer. */
unsigned char *ctf_dynbase; /* Freeable CTF file pointer. */
unsigned char *ctf_buf; /* Uncompressed CTF data buffer. */
size_t ctf_size; /* Size of CTF header + uncompressed data. */
uint32_t *ctf_sxlate; /* Translation table for symtab entries. */
unsigned long ctf_nsyms; /* Number of entries in symtab xlate table. */
uint32_t *ctf_txlate; /* Translation table for type IDs. */
uint32_t *ctf_ptrtab; /* Translation table for pointer-to lookups. */
struct ctf_varent *ctf_vars; /* Sorted variable->type mapping. */
unsigned long ctf_nvars; /* Number of variables in ctf_vars. */
unsigned long ctf_typemax; /* Maximum valid type ID number. */
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. */
struct ctf_file *ctf_parent; /* Parent CTF container (if any). */
const char *ctf_parlabel; /* Label in parent container (if any). */
const char *ctf_parname; /* Basename of parent (if any). */
char *ctf_dynparname; /* Dynamically allocated name of parent. */
uint32_t ctf_parmax; /* Highest type ID of a parent type. */
uint32_t ctf_refcnt; /* Reference count (for parent links). */
uint32_t ctf_flags; /* Libctf flags (see below). */
int ctf_errno; /* Error code for most recent error. */
int ctf_version; /* CTF data version. */
ctf_dynhash_t *ctf_dthash; /* Hash of dynamic type definitions. */
ctf_dynhash_t *ctf_dtbyname; /* DTDs, indexed by name. */
ctf_list_t ctf_dtdefs; /* List of dynamic type definitions. */
ctf_dynhash_t *ctf_dvhash; /* Hash of dynamic variable mappings. */
ctf_list_t ctf_dvdefs; /* List of dynamic variable definitions. */
unsigned long ctf_dtnextid; /* Next dynamic type id to assign. */
unsigned long ctf_dtoldid; /* Oldest id that has been committed. */
unsigned long ctf_snapshots; /* ctf_snapshot() plus ctf_update() count. */
unsigned long ctf_snapshot_lu; /* ctf_snapshot() call count at last update. */
ctf_archive_t *ctf_archive; /* Archive this ctf_file_t came from. */
char *ctf_tmp_typeslice; /* Storage for slicing up type names. */
size_t ctf_tmp_typeslicelen; /* Size of the typeslice. */
void *ctf_specific; /* Data for ctf_get/setspecific(). */
};
/* An abstraction over both a ctf_file_t and a ctf_archive_t. */
struct ctf_archive_internal
{
int ctfi_is_archive;
ctf_file_t *ctfi_file;
struct ctf_archive *ctfi_archive;
ctf_sect_t ctfi_symsect;
ctf_sect_t ctfi_strsect;
void *ctfi_data;
bfd *ctfi_abfd; /* Optional source of section data. */
void (*ctfi_bfd_close) (struct ctf_archive_internal *);
};
/* Return x rounded up to an alignment boundary.
eg, P2ROUNDUP(0x1234, 0x100) == 0x1300 (0x13*align)
eg, P2ROUNDUP(0x5600, 0x100) == 0x5600 (0x56*align) */
#define P2ROUNDUP(x, align) (-(-(x) & -(align)))
/* * If an offs is not aligned already then round it up and align it. */
#define LCTF_ALIGN_OFFS(offs, align) ((offs + (align - 1)) & ~(align - 1))
#define LCTF_TYPE_ISPARENT(fp, id) ((id) <= fp->ctf_parmax)
#define LCTF_TYPE_ISCHILD(fp, id) ((id) > fp->ctf_parmax)
#define LCTF_TYPE_TO_INDEX(fp, id) ((id) & (fp->ctf_parmax))
#define LCTF_INDEX_TO_TYPE(fp, id, child) (child ? ((id) | (fp->ctf_parmax+1)) : \
(id))
#define LCTF_INDEX_TO_TYPEPTR(fp, i) \
((ctf_type_t *)((uintptr_t)(fp)->ctf_buf + (fp)->ctf_txlate[(i)]))
#define LCTF_INFO_KIND(fp, info) ((fp)->ctf_fileops->ctfo_get_kind(info))
#define LCTF_INFO_ISROOT(fp, info) ((fp)->ctf_fileops->ctfo_get_root(info))
#define LCTF_INFO_VLEN(fp, info) ((fp)->ctf_fileops->ctfo_get_vlen(info))
#define LCTF_VBYTES(fp, kind, size, vlen) \
((fp)->ctf_fileops->ctfo_get_vbytes(kind, size, vlen))
static inline ssize_t ctf_get_ctt_size (const ctf_file_t *fp,
const ctf_type_t *tp,
ssize_t *sizep,
ssize_t *incrementp)
{
return (fp->ctf_fileops->ctfo_get_ctt_size (fp, tp, sizep, incrementp));
}
#define LCTF_CHILD 0x0001 /* CTF container is a child */
#define LCTF_RDWR 0x0002 /* CTF container is writable */
#define LCTF_DIRTY 0x0004 /* CTF container has been modified */
extern const ctf_type_t *ctf_lookup_by_id (ctf_file_t **, ctf_id_t);
typedef unsigned int (*ctf_hash_fun) (const void *ptr);
extern unsigned int ctf_hash_integer (const void *ptr);
extern unsigned int ctf_hash_string (const void *ptr);
typedef int (*ctf_hash_eq_fun) (const void *, const void *);
extern int ctf_hash_eq_integer (const void *, const void *);
extern int ctf_hash_eq_string (const void *, const void *);
typedef void (*ctf_hash_free_fun) (void *);
typedef void (*ctf_hash_iter_f) (void *key, void *value, void *arg);
typedef int (*ctf_hash_iter_remove_f) (void *key, void *value, void *arg);
extern ctf_hash_t *ctf_hash_create (unsigned long, ctf_hash_fun, ctf_hash_eq_fun);
extern int ctf_hash_insert_type (ctf_hash_t *, ctf_file_t *, uint32_t, uint32_t);
extern int ctf_hash_define_type (ctf_hash_t *, ctf_file_t *, uint32_t, uint32_t);
extern ctf_id_t ctf_hash_lookup_type (ctf_hash_t *, ctf_file_t *, const char *);
extern uint32_t ctf_hash_size (const ctf_hash_t *);
extern void ctf_hash_destroy (ctf_hash_t *);
extern ctf_dynhash_t *ctf_dynhash_create (ctf_hash_fun, ctf_hash_eq_fun,
ctf_hash_free_fun, ctf_hash_free_fun);
extern int ctf_dynhash_insert (ctf_dynhash_t *, void *, void *);
extern void ctf_dynhash_remove (ctf_dynhash_t *, const void *);
extern void *ctf_dynhash_lookup (ctf_dynhash_t *, const void *);
extern void ctf_dynhash_destroy (ctf_dynhash_t *);
extern void ctf_dynhash_iter (ctf_dynhash_t *, ctf_hash_iter_f, void *);
extern void ctf_dynhash_iter_remove (ctf_dynhash_t *, ctf_hash_iter_remove_f,
void *);
#define ctf_list_prev(elem) ((void *)(((ctf_list_t *)(elem))->l_prev))
#define ctf_list_next(elem) ((void *)(((ctf_list_t *)(elem))->l_next))
extern void ctf_list_append (ctf_list_t *, void *);
extern void ctf_list_prepend (ctf_list_t *, void *);
extern void ctf_list_delete (ctf_list_t *, void *);
extern int ctf_dtd_insert (ctf_file_t *, ctf_dtdef_t *);
extern void ctf_dtd_delete (ctf_file_t *, ctf_dtdef_t *);
extern ctf_dtdef_t *ctf_dtd_lookup (const ctf_file_t *, ctf_id_t);
extern ctf_dtdef_t *ctf_dynamic_type (const ctf_file_t *, ctf_id_t);
extern int ctf_dvd_insert (ctf_file_t *, ctf_dvdef_t *);
extern void ctf_dvd_delete (ctf_file_t *, ctf_dvdef_t *);
extern ctf_dvdef_t *ctf_dvd_lookup (const ctf_file_t *, const char *);
extern void ctf_decl_init (ctf_decl_t *);
extern void ctf_decl_fini (ctf_decl_t *);
extern void ctf_decl_push (ctf_decl_t *, ctf_file_t *, ctf_id_t);
_libctf_printflike_ (2, 3)
extern void ctf_decl_sprintf (ctf_decl_t *, const char *, ...);
extern char *ctf_decl_buf (ctf_decl_t *cd);
extern const char *ctf_strraw (ctf_file_t *, uint32_t);
extern const char *ctf_strptr (ctf_file_t *, uint32_t);
extern int ctf_str_create_atoms (ctf_file_t *);
extern void ctf_str_free_atoms (ctf_file_t *);
extern const char *ctf_str_add (ctf_file_t *, const char *);
extern const char *ctf_str_add_ref (ctf_file_t *, const char *, uint32_t *);
extern void ctf_str_rollback (ctf_file_t *, ctf_snapshot_id_t);
extern void ctf_str_purge_refs (ctf_file_t *);
extern ctf_strs_writable_t ctf_str_write_strtab (ctf_file_t *);
extern struct ctf_archive *ctf_arc_open_internal (const char *, int *);
extern struct ctf_archive *ctf_arc_bufopen (const void *, size_t, int *);
extern void ctf_arc_close_internal (struct ctf_archive *);
extern void *ctf_set_open_errno (int *, int);
extern unsigned long ctf_set_errno (ctf_file_t *, int);
_libctf_malloc_
extern void *ctf_mmap (size_t length, size_t offset, int fd);
extern void ctf_munmap (void *, size_t);
extern ssize_t ctf_pread (int fd, void *buf, ssize_t count, off_t offset);
_libctf_malloc_
extern void *ctf_alloc (size_t);
extern void ctf_free (void *);
extern void *ctf_realloc (ctf_file_t *, void *, size_t);
_libctf_malloc_
extern char *ctf_strdup (const char *);
extern char *ctf_str_append (char *, const char *);
extern const char *ctf_strerror (int);
extern ctf_id_t ctf_type_resolve_unsliced (ctf_file_t *, ctf_id_t);
extern int ctf_type_kind_unsliced (ctf_file_t *, ctf_id_t);
_libctf_printflike_ (1, 2)
extern void ctf_dprintf (const char *, ...);
extern void libctf_init_debug (void);
extern Elf64_Sym *ctf_sym_to_elf64 (const Elf32_Sym *src, Elf64_Sym *dst);
extern const char *ctf_lookup_symbol_name (ctf_file_t *fp, unsigned long symidx);
/* Variables, all underscore-prepended. */
extern const char _CTF_SECTION[]; /* name of CTF ELF section */
extern const char _CTF_NULLSTR[]; /* empty string */
extern int _libctf_version; /* library client version */
extern int _libctf_debug; /* debugging messages enabled */
#ifdef __cplusplus
}
#endif
#endif /* _CTF_IMPL_H */
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