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ctf-serialize.c
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/* CTF dict creation.
Copyright (C) 2019-2024 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/>. */
#include <ctf-impl.h>
#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <zlib.h>
#include <elf.h>
#include "elf-bfd.h"
/* Symtypetab sections. */
/* Symtypetab emission flags. */
#define CTF_SYMTYPETAB_EMIT_FUNCTION 0x1
#define CTF_SYMTYPETAB_EMIT_PAD 0x2
#define CTF_SYMTYPETAB_FORCE_INDEXED 0x4
/* Properties of symtypetab emission, shared by symtypetab section
sizing and symtypetab emission itself. */
typedef struct emit_symtypetab_state
{
/* True if linker-reported symbols are being filtered out. symfp is set if
this is true: otherwise, indexing is forced and the symflags indicate as
much. */
int filter_syms;
/* True if symbols are being sorted. */
int sort_syms;
/* Flags for symtypetab emission. */
int symflags;
/* The dict to which the linker has reported symbols. */
ctf_dict_t *symfp;
/* The maximum number of objects seen. */
size_t maxobjt;
/* The maximum number of func info entris seen. */
size_t maxfunc;
} emit_symtypetab_state_t;
/* Determine if a symbol is "skippable" and should never appear in the
symtypetab sections. */
int
ctf_symtab_skippable (ctf_link_sym_t *sym)
{
/* Never skip symbols whose name is not yet known. */
if (sym->st_nameidx_set)
return 0;
return (sym->st_name == NULL || sym->st_name[0] == 0
|| sym->st_shndx == SHN_UNDEF
|| strcmp (sym->st_name, "_START_") == 0
|| strcmp (sym->st_name, "_END_") == 0
|| (sym->st_type == STT_OBJECT && sym->st_shndx == SHN_EXTABS
&& sym->st_value == 0));
}
/* Get the number of symbols in a symbol hash, the count of symbols, the maximum
seen, the eventual size, without any padding elements, of the func/data and
(if generated) index sections, and the size of accumulated padding elements.
The linker-reported set of symbols is found in SYMFP: it may be NULL if
symbol filtering is not desired, in which case CTF_SYMTYPETAB_FORCE_INDEXED
will always be set in the flags.
Also figure out if any symbols need to be moved to the variable section, and
add them (if not already present). */
_libctf_nonnull_ ((1,3,4,5,6,7,8))
static int
symtypetab_density (ctf_dict_t *fp, ctf_dict_t *symfp, ctf_dynhash_t *symhash,
size_t *count, size_t *max, size_t *unpadsize,
size_t *padsize, size_t *idxsize, int flags)
{
ctf_next_t *i = NULL;
const void *name;
const void *ctf_sym;
ctf_dynhash_t *linker_known = NULL;
int err;
int beyond_max = 0;
*count = 0;
*max = 0;
*unpadsize = 0;
*idxsize = 0;
*padsize = 0;
if (!(flags & CTF_SYMTYPETAB_FORCE_INDEXED))
{
/* Make a dynhash citing only symbols reported by the linker of the
appropriate type, then traverse all potential-symbols we know the types
of, removing them from linker_known as we go. Once this is done, the
only symbols remaining in linker_known are symbols we don't know the
types of: we must emit pads for those symbols that are below the
maximum symbol we will emit (any beyond that are simply skipped).
If there are none, this symtypetab will be empty: just report that. */
if (!symfp->ctf_dynsyms)
return 0;
if ((linker_known = ctf_dynhash_create (ctf_hash_string, ctf_hash_eq_string,
NULL, NULL)) == NULL)
return (ctf_set_errno (fp, ENOMEM));
while ((err = ctf_dynhash_cnext (symfp->ctf_dynsyms, &i,
&name, &ctf_sym)) == 0)
{
ctf_link_sym_t *sym = (ctf_link_sym_t *) ctf_sym;
if (((flags & CTF_SYMTYPETAB_EMIT_FUNCTION)
&& sym->st_type != STT_FUNC)
|| (!(flags & CTF_SYMTYPETAB_EMIT_FUNCTION)
&& sym->st_type != STT_OBJECT))
continue;
if (ctf_symtab_skippable (sym))
continue;
/* This should only be true briefly before all the names are
finalized, long before we get this far. */
if (!ctf_assert (fp, !sym->st_nameidx_set))
return -1; /* errno is set for us. */
if (ctf_dynhash_cinsert (linker_known, name, ctf_sym) < 0)
{
ctf_dynhash_destroy (linker_known);
return (ctf_set_errno (fp, ENOMEM));
}
}
if (err != ECTF_NEXT_END)
{
ctf_err_warn (fp, 0, err, _("iterating over linker-known symbols during "
"serialization"));
ctf_dynhash_destroy (linker_known);
return (ctf_set_errno (fp, err));
}
}
while ((err = ctf_dynhash_cnext (symhash, &i, &name, NULL)) == 0)
{
ctf_link_sym_t *sym;
if (!(flags & CTF_SYMTYPETAB_FORCE_INDEXED))
{
/* Linker did not report symbol in symtab. Remove it from the
set of known data symbols and continue. */
if ((sym = ctf_dynhash_lookup (symfp->ctf_dynsyms, name)) == NULL)
{
ctf_dynhash_remove (symhash, name);
continue;
}
/* We don't remove skippable symbols from the symhash because we don't
want them to be migrated into variables. */
if (ctf_symtab_skippable (sym))
continue;
if ((flags & CTF_SYMTYPETAB_EMIT_FUNCTION)
&& sym->st_type != STT_FUNC)
{
ctf_err_warn (fp, 1, 0, _("symbol %s (%x) added to CTF as a "
"function but is of type %x. "
"The symbol type lookup tables "
"are probably corrupted"),
sym->st_name, sym->st_symidx, sym->st_type);
ctf_dynhash_remove (symhash, name);
continue;
}
else if (!(flags & CTF_SYMTYPETAB_EMIT_FUNCTION)
&& sym->st_type != STT_OBJECT)
{
ctf_err_warn (fp, 1, 0, _("symbol %s (%x) added to CTF as a "
"data object but is of type %x. "
"The symbol type lookup tables "
"are probably corrupted"),
sym->st_name, sym->st_symidx, sym->st_type);
ctf_dynhash_remove (symhash, name);
continue;
}
ctf_dynhash_remove (linker_known, name);
}
*unpadsize += sizeof (uint32_t);
(*count)++;
if (!(flags & CTF_SYMTYPETAB_FORCE_INDEXED))
{
if (*max < sym->st_symidx)
*max = sym->st_symidx;
}
else
(*max)++;
}
if (err != ECTF_NEXT_END)
{
ctf_err_warn (fp, 0, err, _("iterating over CTF symtypetab during "
"serialization"));
ctf_dynhash_destroy (linker_known);
return (ctf_set_errno (fp, err));
}
if (!(flags & CTF_SYMTYPETAB_FORCE_INDEXED))
{
while ((err = ctf_dynhash_cnext (linker_known, &i, NULL, &ctf_sym)) == 0)
{
ctf_link_sym_t *sym = (ctf_link_sym_t *) ctf_sym;
if (sym->st_symidx > *max)
beyond_max++;
}
if (err != ECTF_NEXT_END)
{
ctf_err_warn (fp, 0, err, _("iterating over linker-known symbols "
"during CTF serialization"));
ctf_dynhash_destroy (linker_known);
return (ctf_set_errno (fp, err));
}
}
*idxsize = *count * sizeof (uint32_t);
if (!(flags & CTF_SYMTYPETAB_FORCE_INDEXED))
*padsize = (ctf_dynhash_elements (linker_known) - beyond_max) * sizeof (uint32_t);
ctf_dynhash_destroy (linker_known);
return 0;
}
/* Emit an objt or func symtypetab into DP in a particular order defined by an
array of ctf_link_sym_t or symbol names passed in. The index has NIDX
elements in it: unindexed output would terminate at symbol OUTMAX and is in
any case no larger than SIZE bytes. Some index elements are expected to be
skipped: see symtypetab_density. The linker-reported set of symbols (if any)
is found in SYMFP. */
static int
emit_symtypetab (ctf_dict_t *fp, ctf_dict_t *symfp, uint32_t *dp,
ctf_link_sym_t **idx, const char **nameidx, uint32_t nidx,
uint32_t outmax, int size, int flags)
{
uint32_t i;
uint32_t *dpp = dp;
ctf_dynhash_t *symhash;
ctf_dprintf ("Emitting table of size %i, outmax %u, %u symtypetab entries, "
"flags %i\n", size, outmax, nidx, flags);
/* Empty table? Nothing to do. */
if (size == 0)
return 0;
if (flags & CTF_SYMTYPETAB_EMIT_FUNCTION)
symhash = fp->ctf_funchash;
else
symhash = fp->ctf_objthash;
for (i = 0; i < nidx; i++)
{
const char *sym_name;
void *type;
/* If we have a linker-reported set of symbols, we may be given that set
to work from, or a set of symbol names. In both cases we want to look
at the corresponding linker-reported symbol (if any). */
if (!(flags & CTF_SYMTYPETAB_FORCE_INDEXED))
{
ctf_link_sym_t *this_link_sym;
if (idx)
this_link_sym = idx[i];
else
this_link_sym = ctf_dynhash_lookup (symfp->ctf_dynsyms, nameidx[i]);
/* Unreported symbol number. No pad, no nothing. */
if (!this_link_sym)
continue;
/* Symbol of the wrong type, or skippable? This symbol is not in this
table. */
if (((flags & CTF_SYMTYPETAB_EMIT_FUNCTION)
&& this_link_sym->st_type != STT_FUNC)
|| (!(flags & CTF_SYMTYPETAB_EMIT_FUNCTION)
&& this_link_sym->st_type != STT_OBJECT))
continue;
if (ctf_symtab_skippable (this_link_sym))
continue;
sym_name = this_link_sym->st_name;
/* Linker reports symbol of a different type to the symbol we actually
added? Skip the symbol. No pad, since the symbol doesn't actually
belong in this table at all. (Warned about in
symtypetab_density.) */
if ((this_link_sym->st_type == STT_FUNC)
&& (ctf_dynhash_lookup (fp->ctf_objthash, sym_name)))
continue;
if ((this_link_sym->st_type == STT_OBJECT)
&& (ctf_dynhash_lookup (fp->ctf_funchash, sym_name)))
continue;
}
else
sym_name = nameidx[i];
/* Symbol in index but no type set? Silently skip and (optionally)
pad. (In force-indexed mode, this is also where we track symbols of
the wrong type for this round of insertion.) */
if ((type = ctf_dynhash_lookup (symhash, sym_name)) == NULL)
{
if (flags & CTF_SYMTYPETAB_EMIT_PAD)
*dpp++ = 0;
continue;
}
if (!ctf_assert (fp, (((char *) dpp) - (char *) dp) < size))
return -1; /* errno is set for us. */
*dpp++ = (ctf_id_t) (uintptr_t) type;
/* When emitting unindexed output, all later symbols are pads: stop
early. */
if ((flags & CTF_SYMTYPETAB_EMIT_PAD) && idx[i]->st_symidx == outmax)
break;
}
return 0;
}
/* Emit an objt or func symtypetab index into DP in a paticular order defined by
an array of symbol names passed in. Stop at NIDX. The linker-reported set
of symbols (if any) is found in SYMFP. */
static int
emit_symtypetab_index (ctf_dict_t *fp, ctf_dict_t *symfp, uint32_t *dp,
const char **idx, uint32_t nidx, int size, int flags)
{
uint32_t i;
uint32_t *dpp = dp;
ctf_dynhash_t *symhash;
ctf_dprintf ("Emitting index of size %i, %u entries reported by linker, "
"flags %i\n", size, nidx, flags);
/* Empty table? Nothing to do. */
if (size == 0)
return 0;
if (flags & CTF_SYMTYPETAB_EMIT_FUNCTION)
symhash = fp->ctf_funchash;
else
symhash = fp->ctf_objthash;
/* Indexes should always be unpadded. */
if (!ctf_assert (fp, !(flags & CTF_SYMTYPETAB_EMIT_PAD)))
return -1; /* errno is set for us. */
for (i = 0; i < nidx; i++)
{
const char *sym_name;
void *type;
if (!(flags & CTF_SYMTYPETAB_FORCE_INDEXED))
{
ctf_link_sym_t *this_link_sym;
this_link_sym = ctf_dynhash_lookup (symfp->ctf_dynsyms, idx[i]);
/* This is an index: unreported symbols should never appear in it. */
if (!ctf_assert (fp, this_link_sym != NULL))
return -1; /* errno is set for us. */
/* Symbol of the wrong type, or skippable? This symbol is not in this
table. */
if (((flags & CTF_SYMTYPETAB_EMIT_FUNCTION)
&& this_link_sym->st_type != STT_FUNC)
|| (!(flags & CTF_SYMTYPETAB_EMIT_FUNCTION)
&& this_link_sym->st_type != STT_OBJECT))
continue;
if (ctf_symtab_skippable (this_link_sym))
continue;
sym_name = this_link_sym->st_name;
/* Linker reports symbol of a different type to the symbol we actually
added? Skip the symbol. */
if ((this_link_sym->st_type == STT_FUNC)
&& (ctf_dynhash_lookup (fp->ctf_objthash, sym_name)))
continue;
if ((this_link_sym->st_type == STT_OBJECT)
&& (ctf_dynhash_lookup (fp->ctf_funchash, sym_name)))
continue;
}
else
sym_name = idx[i];
/* Symbol in index and reported by linker, but no type set? Silently skip
and (optionally) pad. (In force-indexed mode, this is also where we
track symbols of the wrong type for this round of insertion.) */
if ((type = ctf_dynhash_lookup (symhash, sym_name)) == NULL)
continue;
ctf_str_add_ref (fp, sym_name, dpp++);
if (!ctf_assert (fp, (((char *) dpp) - (char *) dp) <= size))
return -1; /* errno is set for us. */
}
return 0;
}
/* Delete symbols that have been assigned names from the variable section. Must
be called from within ctf_serialize, because that is the only place you can
safely delete variables without messing up ctf_rollback. */
static int
symtypetab_delete_nonstatics (ctf_dict_t *fp, ctf_dict_t *symfp)
{
ctf_dvdef_t *dvd, *nvd;
ctf_id_t type;
for (dvd = ctf_list_next (&fp->ctf_dvdefs); dvd != NULL; dvd = nvd)
{
nvd = ctf_list_next (dvd);
if ((((type = (ctf_id_t) (uintptr_t)
ctf_dynhash_lookup (fp->ctf_objthash, dvd->dvd_name)) > 0)
|| (type = (ctf_id_t) (uintptr_t)
ctf_dynhash_lookup (fp->ctf_funchash, dvd->dvd_name)) > 0)
&& ctf_dynhash_lookup (symfp->ctf_dynsyms, dvd->dvd_name) != NULL
&& type == dvd->dvd_type)
ctf_dvd_delete (fp, dvd);
}
return 0;
}
/* Figure out the sizes of the symtypetab sections, their indexed state,
etc. */
static int
ctf_symtypetab_sect_sizes (ctf_dict_t *fp, emit_symtypetab_state_t *s,
ctf_header_t *hdr, size_t *objt_size,
size_t *func_size, size_t *objtidx_size,
size_t *funcidx_size)
{
size_t nfuncs, nobjts;
size_t objt_unpadsize, func_unpadsize, objt_padsize, func_padsize;
/* If doing a writeout as part of linking, and the link flags request it,
filter out reported symbols from the variable section, and filter out all
other symbols from the symtypetab sections. (If we are not linking, the
symbols are sorted; if we are linking, don't bother sorting if we are not
filtering out reported symbols: this is almost certaily an ld -r and only
the linker is likely to consume these symtypetabs again. The linker
doesn't care what order the symtypetab entries is in, since it only
iterates over symbols and does not use the ctf_lookup_by_symbol* API.) */
s->sort_syms = 1;
if (fp->ctf_flags & LCTF_LINKING)
{
s->filter_syms = !(fp->ctf_link_flags & CTF_LINK_NO_FILTER_REPORTED_SYMS);
if (!s->filter_syms)
s->sort_syms = 0;
}
/* Find the dict to which the linker has reported symbols, if any. */
if (s->filter_syms)
{
if (!fp->ctf_dynsyms && fp->ctf_parent && fp->ctf_parent->ctf_dynsyms)
s->symfp = fp->ctf_parent;
else
s->symfp = fp;
}
/* If not filtering, keep all potential symbols in an unsorted, indexed
dict. */
if (!s->filter_syms)
s->symflags = CTF_SYMTYPETAB_FORCE_INDEXED;
else
hdr->cth_flags |= CTF_F_IDXSORTED;
if (!ctf_assert (fp, (s->filter_syms && s->symfp)
|| (!s->filter_syms && !s->symfp
&& ((s->symflags & CTF_SYMTYPETAB_FORCE_INDEXED) != 0))))
return -1;
/* Work out the sizes of the object and function sections, and work out the
number of pad (unassigned) symbols in each, and the overall size of the
sections. */
if (symtypetab_density (fp, s->symfp, fp->ctf_objthash, &nobjts, &s->maxobjt,
&objt_unpadsize, &objt_padsize, objtidx_size,
s->symflags) < 0)
return -1; /* errno is set for us. */
ctf_dprintf ("Object symtypetab: %i objects, max %i, unpadded size %i, "
"%i bytes of pads, index size %i\n", (int) nobjts,
(int) s->maxobjt, (int) objt_unpadsize, (int) objt_padsize,
(int) *objtidx_size);
if (symtypetab_density (fp, s->symfp, fp->ctf_funchash, &nfuncs, &s->maxfunc,
&func_unpadsize, &func_padsize, funcidx_size,
s->symflags | CTF_SYMTYPETAB_EMIT_FUNCTION) < 0)
return -1; /* errno is set for us. */
ctf_dprintf ("Function symtypetab: %i functions, max %i, unpadded size %i, "
"%i bytes of pads, index size %i\n", (int) nfuncs,
(int) s->maxfunc, (int) func_unpadsize, (int) func_padsize,
(int) *funcidx_size);
/* It is worth indexing each section if it would save space to do so, due to
reducing the number of pads sufficiently. A pad is the same size as a
single index entry: but index sections compress relatively poorly compared
to constant pads, so it takes a lot of contiguous padding to equal one
index section entry. It would be nice to be able to *verify* whether we
would save space after compression rather than guessing, but this seems
difficult, since it would require complete reserialization. Regardless, if
the linker has not reported any symbols (e.g. if this is not a final link
but just an ld -r), we must emit things in indexed fashion just as the
compiler does. */
*objt_size = objt_unpadsize;
if (!(s->symflags & CTF_SYMTYPETAB_FORCE_INDEXED)
&& ((objt_padsize + objt_unpadsize) * CTF_INDEX_PAD_THRESHOLD
> objt_padsize))
{
*objt_size += objt_padsize;
*objtidx_size = 0;
}
*func_size = func_unpadsize;
if (!(s->symflags & CTF_SYMTYPETAB_FORCE_INDEXED)
&& ((func_padsize + func_unpadsize) * CTF_INDEX_PAD_THRESHOLD
> func_padsize))
{
*func_size += func_padsize;
*funcidx_size = 0;
}
/* If we are filtering symbols out, those symbols that the linker has not
reported have now been removed from the ctf_objthash and ctf_funchash.
Delete entries from the variable section that duplicate newly-added
symbols. There's no need to migrate new ones in: we do that (if necessary)
in ctf_link_deduplicating_variables. */
if (s->filter_syms && s->symfp->ctf_dynsyms &&
symtypetab_delete_nonstatics (fp, s->symfp) < 0)
return -1;
return 0;
}
static int
ctf_emit_symtypetab_sects (ctf_dict_t *fp, emit_symtypetab_state_t *s,
unsigned char **tptr, size_t objt_size,
size_t func_size, size_t objtidx_size,
size_t funcidx_size)
{
unsigned char *t = *tptr;
size_t nsymtypes = 0;
const char **sym_name_order = NULL;
int err;
/* Sort the linker's symbols into name order if need be. */
if ((objtidx_size != 0) || (funcidx_size != 0))
{
ctf_next_t *i = NULL;
void *symname;
const char **walk;
if (s->filter_syms)
{
if (s->symfp->ctf_dynsyms)
nsymtypes = ctf_dynhash_elements (s->symfp->ctf_dynsyms);
else
nsymtypes = 0;
}
else
nsymtypes = ctf_dynhash_elements (fp->ctf_objthash)
+ ctf_dynhash_elements (fp->ctf_funchash);
if ((sym_name_order = calloc (nsymtypes, sizeof (const char *))) == NULL)
goto oom;
walk = sym_name_order;
if (s->filter_syms)
{
if (s->symfp->ctf_dynsyms)
{
while ((err = ctf_dynhash_next_sorted (s->symfp->ctf_dynsyms, &i,
&symname, NULL,
ctf_dynhash_sort_by_name,
NULL)) == 0)
*walk++ = (const char *) symname;
if (err != ECTF_NEXT_END)
goto symerr;
}
}
else
{
ctf_hash_sort_f sort_fun = NULL;
/* Since we partition the set of symbols back into objt and func,
we can sort the two independently without harm. */
if (s->sort_syms)
sort_fun = ctf_dynhash_sort_by_name;
while ((err = ctf_dynhash_next_sorted (fp->ctf_objthash, &i, &symname,
NULL, sort_fun, NULL)) == 0)
*walk++ = (const char *) symname;
if (err != ECTF_NEXT_END)
goto symerr;
while ((err = ctf_dynhash_next_sorted (fp->ctf_funchash, &i, &symname,
NULL, sort_fun, NULL)) == 0)
*walk++ = (const char *) symname;
if (err != ECTF_NEXT_END)
goto symerr;
}
}
/* Emit the object and function sections, and if necessary their indexes.
Emission is done in symtab order if there is no index, and in index
(name) order otherwise. */
if ((objtidx_size == 0) && s->symfp && s->symfp->ctf_dynsymidx)
{
ctf_dprintf ("Emitting unindexed objt symtypetab\n");
if (emit_symtypetab (fp, s->symfp, (uint32_t *) t,
s->symfp->ctf_dynsymidx, NULL,
s->symfp->ctf_dynsymmax + 1, s->maxobjt,
objt_size, s->symflags | CTF_SYMTYPETAB_EMIT_PAD) < 0)
goto err; /* errno is set for us. */
}
else
{
ctf_dprintf ("Emitting indexed objt symtypetab\n");
if (emit_symtypetab (fp, s->symfp, (uint32_t *) t, NULL,
sym_name_order, nsymtypes, s->maxobjt,
objt_size, s->symflags) < 0)
goto err; /* errno is set for us. */
}
t += objt_size;
if ((funcidx_size == 0) && s->symfp && s->symfp->ctf_dynsymidx)
{
ctf_dprintf ("Emitting unindexed func symtypetab\n");
if (emit_symtypetab (fp, s->symfp, (uint32_t *) t,
s->symfp->ctf_dynsymidx, NULL,
s->symfp->ctf_dynsymmax + 1, s->maxfunc,
func_size, s->symflags | CTF_SYMTYPETAB_EMIT_FUNCTION
| CTF_SYMTYPETAB_EMIT_PAD) < 0)
goto err; /* errno is set for us. */
}
else
{
ctf_dprintf ("Emitting indexed func symtypetab\n");
if (emit_symtypetab (fp, s->symfp, (uint32_t *) t, NULL, sym_name_order,
nsymtypes, s->maxfunc, func_size,
s->symflags | CTF_SYMTYPETAB_EMIT_FUNCTION) < 0)
goto err; /* errno is set for us. */
}
t += func_size;
if (objtidx_size > 0)
if (emit_symtypetab_index (fp, s->symfp, (uint32_t *) t, sym_name_order,
nsymtypes, objtidx_size, s->symflags) < 0)
goto err;
t += objtidx_size;
if (funcidx_size > 0)
if (emit_symtypetab_index (fp, s->symfp, (uint32_t *) t, sym_name_order,
nsymtypes, funcidx_size,
s->symflags | CTF_SYMTYPETAB_EMIT_FUNCTION) < 0)
goto err;
t += funcidx_size;
free (sym_name_order);
*tptr = t;
return 0;
oom:
ctf_set_errno (fp, EAGAIN);
goto err;
symerr:
ctf_err_warn (fp, 0, err, _("error serializing symtypetabs"));
err:
free (sym_name_order);
return -1;
}
/* Type section. */
/* Iterate through the dynamic type definition list and compute the
size of the CTF type section. */
static size_t
ctf_type_sect_size (ctf_dict_t *fp)
{
ctf_dtdef_t *dtd;
size_t type_size;
for (type_size = 0, dtd = ctf_list_next (&fp->ctf_dtdefs);
dtd != NULL; dtd = ctf_list_next (dtd))
{
uint32_t kind = LCTF_INFO_KIND (fp, dtd->dtd_data.ctt_info);
uint32_t vlen = LCTF_INFO_VLEN (fp, dtd->dtd_data.ctt_info);
size_t type_ctt_size = dtd->dtd_data.ctt_size;
/* Shrink ctf_type_t-using types from a ctf_type_t to a ctf_stype_t
if possible. */
if (kind == CTF_K_STRUCT || kind == CTF_K_UNION)
{
size_t lsize = CTF_TYPE_LSIZE (&dtd->dtd_data);
if (lsize <= CTF_MAX_SIZE)
type_ctt_size = lsize;
}
if (type_ctt_size != CTF_LSIZE_SENT)
type_size += sizeof (ctf_stype_t);
else
type_size += sizeof (ctf_type_t);
switch (kind)
{
case CTF_K_INTEGER:
case CTF_K_FLOAT:
type_size += sizeof (uint32_t);
break;
case CTF_K_ARRAY:
type_size += sizeof (ctf_array_t);
break;
case CTF_K_SLICE:
type_size += sizeof (ctf_slice_t);
break;
case CTF_K_FUNCTION:
type_size += sizeof (uint32_t) * (vlen + (vlen & 1));
break;
case CTF_K_STRUCT:
case CTF_K_UNION:
if (type_ctt_size < CTF_LSTRUCT_THRESH)
type_size += sizeof (ctf_member_t) * vlen;
else
type_size += sizeof (ctf_lmember_t) * vlen;
break;
case CTF_K_ENUM:
type_size += sizeof (ctf_enum_t) * vlen;
break;
}
}
return type_size;
}
/* Take a final lap through the dynamic type definition list and copy the
appropriate type records to the output buffer, noting down the strings as
we go. */
static void
ctf_emit_type_sect (ctf_dict_t *fp, unsigned char **tptr)
{
unsigned char *t = *tptr;
ctf_dtdef_t *dtd;
for (dtd = ctf_list_next (&fp->ctf_dtdefs);
dtd != NULL; dtd = ctf_list_next (dtd))
{
uint32_t kind = LCTF_INFO_KIND (fp, dtd->dtd_data.ctt_info);
uint32_t vlen = LCTF_INFO_VLEN (fp, dtd->dtd_data.ctt_info);
size_t type_ctt_size = dtd->dtd_data.ctt_size;
size_t len;
ctf_stype_t *copied;
const char *name;
size_t i;
/* Shrink ctf_type_t-using types from a ctf_type_t to a ctf_stype_t
if possible. */
if (kind == CTF_K_STRUCT || kind == CTF_K_UNION)
{
size_t lsize = CTF_TYPE_LSIZE (&dtd->dtd_data);
if (lsize <= CTF_MAX_SIZE)
type_ctt_size = lsize;
}
if (type_ctt_size != CTF_LSIZE_SENT)
len = sizeof (ctf_stype_t);
else
len = sizeof (ctf_type_t);
memcpy (t, &dtd->dtd_data, len);
copied = (ctf_stype_t *) t; /* name is at the start: constant offset. */
if (copied->ctt_name
&& (name = ctf_strraw (fp, copied->ctt_name)) != NULL)
{
ctf_str_add_ref (fp, name, &copied->ctt_name);
ctf_str_add_ref (fp, name, &dtd->dtd_data.ctt_name);
}
copied->ctt_size = type_ctt_size;
t += len;
switch (kind)
{
case CTF_K_INTEGER:
case CTF_K_FLOAT:
memcpy (t, dtd->dtd_vlen, sizeof (uint32_t));
t += sizeof (uint32_t);
break;
case CTF_K_SLICE:
memcpy (t, dtd->dtd_vlen, sizeof (struct ctf_slice));
t += sizeof (struct ctf_slice);
break;
case CTF_K_ARRAY:
memcpy (t, dtd->dtd_vlen, sizeof (struct ctf_array));
t += sizeof (struct ctf_array);
break;
case CTF_K_FUNCTION:
/* Functions with no args also have no vlen. */
if (dtd->dtd_vlen)
memcpy (t, dtd->dtd_vlen, sizeof (uint32_t) * (vlen + (vlen & 1)));
t += sizeof (uint32_t) * (vlen + (vlen & 1));
break;
/* These need to be copied across element by element, depending on
their ctt_size. */
case CTF_K_STRUCT:
case CTF_K_UNION:
{
ctf_lmember_t *dtd_vlen = (ctf_lmember_t *) dtd->dtd_vlen;
ctf_lmember_t *t_lvlen = (ctf_lmember_t *) t;
ctf_member_t *t_vlen = (ctf_member_t *) t;
for (i = 0; i < vlen; i++)
{
const char *name = ctf_strraw (fp, dtd_vlen[i].ctlm_name);
ctf_str_add_ref (fp, name, &dtd_vlen[i].ctlm_name);
if (type_ctt_size < CTF_LSTRUCT_THRESH)
{
t_vlen[i].ctm_name = dtd_vlen[i].ctlm_name;
t_vlen[i].ctm_type = dtd_vlen[i].ctlm_type;
t_vlen[i].ctm_offset = CTF_LMEM_OFFSET (&dtd_vlen[i]);
ctf_str_add_ref (fp, name, &t_vlen[i].ctm_name);
}
else
{
t_lvlen[i] = dtd_vlen[i];
ctf_str_add_ref (fp, name, &t_lvlen[i].ctlm_name);
}
}
}
if (type_ctt_size < CTF_LSTRUCT_THRESH)
t += sizeof (ctf_member_t) * vlen;
else
t += sizeof (ctf_lmember_t) * vlen;
break;
case CTF_K_ENUM:
{
ctf_enum_t *dtd_vlen = (struct ctf_enum *) dtd->dtd_vlen;
ctf_enum_t *t_vlen = (struct ctf_enum *) t;
memcpy (t, dtd->dtd_vlen, sizeof (struct ctf_enum) * vlen);
for (i = 0; i < vlen; i++)
{
const char *name = ctf_strraw (fp, dtd_vlen[i].cte_name);
ctf_str_add_ref (fp, name, &t_vlen[i].cte_name);
ctf_str_add_ref (fp, name, &dtd_vlen[i].cte_name);
}
t += sizeof (struct ctf_enum) * vlen;
break;
}
}
}
*tptr = t;
}
/* Variable section. */
/* Sort a newly-constructed static variable array. */
typedef struct ctf_sort_var_arg_cb
{
ctf_dict_t *fp;
ctf_strs_t *strtab;
} ctf_sort_var_arg_cb_t;
static int
ctf_sort_var (const void *one_, const void *two_, void *arg_)
{
const ctf_varent_t *one = one_;
const ctf_varent_t *two = two_;
ctf_sort_var_arg_cb_t *arg = arg_;
return (strcmp (ctf_strraw_explicit (arg->fp, one->ctv_name, arg->strtab),
ctf_strraw_explicit (arg->fp, two->ctv_name, arg->strtab)));
}
/* Overall serialization. */
/* If the specified CTF dict is writable and has been modified, reload this dict
with the updated type definitions, ready for serialization. In order to make
this code and the rest of libctf as simple as possible, we perform updates by
taking the dynamic type definitions and creating an in-memory CTF dict
containing the definitions, and then call ctf_simple_open_internal() on it.
We perform one extra trick here for the benefit of callers and to keep our
code simple: ctf_simple_open_internal() will return a new ctf_dict_t, but we
want to keep the fp constant for the caller, so after
ctf_simple_open_internal() returns, we use memcpy to swap the interior of the
old and new ctf_dict_t's, and then free the old. */
int
ctf_serialize (ctf_dict_t *fp)
{
ctf_dict_t ofp, *nfp;
ctf_header_t hdr, *hdrp;
ctf_dvdef_t *dvd;
ctf_varent_t *dvarents;
ctf_strs_writable_t strtab;
int err;
int num_missed_str_refs;
unsigned char *t;
unsigned long i;
size_t buf_size, type_size, objt_size, func_size;
size_t funcidx_size, objtidx_size;
size_t nvars;
unsigned char *buf = NULL, *newbuf;
emit_symtypetab_state_t symstate;
memset (&symstate, 0, sizeof (emit_symtypetab_state_t));
if (!(fp->ctf_flags & LCTF_RDWR))
return (ctf_set_errno (fp, ECTF_RDONLY));
/* Update required? */
if (!(fp->ctf_flags & LCTF_DIRTY))
return 0;
/* The strtab refs table must be empty at this stage. Any refs already added
will be corrupted by any modifications, including reserialization, after
strtab finalization is complete. Only this function, and functions it
calls, may add refs, and all memory locations (including in the dtds)
containing strtab offsets must be traversed as part of serialization, and
refs added. */
if (!ctf_assert (fp, fp->ctf_str_num_refs == 0))
return -1; /* errno is set for us. */
/* Fill in an initial CTF header. We will leave the label, object,
and function sections empty and only output a header, type section,
and string table. The type section begins at a 4-byte aligned
boundary past the CTF header itself (at relative offset zero). The flag
indicating a new-style function info section (an array of CTF_K_FUNCTION
type IDs in the types section) is flipped on. */
memset (&hdr, 0, sizeof (hdr));
hdr.cth_magic = CTF_MAGIC;
hdr.cth_version = CTF_VERSION;
/* This is a new-format func info section, and the symtab and strtab come out