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ctf-types.c
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/* Type handling functions.
Copyright (C) 2019-2021 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>
/* Determine whether a type is a parent or a child. */
int
ctf_type_isparent (ctf_dict_t *fp, ctf_id_t id)
{
return (LCTF_TYPE_ISPARENT (fp, id));
}
int
ctf_type_ischild (ctf_dict_t * fp, ctf_id_t id)
{
return (LCTF_TYPE_ISCHILD (fp, id));
}
/* Iterate over the members of a STRUCT or UNION. We pass the name, member
type, and offset of each member to the specified callback function. */
int
ctf_member_iter (ctf_dict_t *fp, ctf_id_t type, ctf_member_f *func, void *arg)
{
ctf_next_t *i = NULL;
ssize_t offset;
const char *name;
ctf_id_t membtype;
while ((offset = ctf_member_next (fp, type, &i, &name, &membtype, 0)) >= 0)
{
int rc;
if ((rc = func (name, membtype, offset, arg)) != 0)
{
ctf_next_destroy (i);
return rc;
}
}
if (ctf_errno (fp) != ECTF_NEXT_END)
return -1; /* errno is set for us. */
return 0;
}
/* Iterate over the members of a STRUCT or UNION, returning each member's
offset and optionally name and member type in turn. On end-of-iteration,
returns -1. If FLAGS is CTF_MN_RECURSE, recurse into unnamed members. */
ssize_t
ctf_member_next (ctf_dict_t *fp, ctf_id_t type, ctf_next_t **it,
const char **name, ctf_id_t *membtype, int flags)
{
ctf_dict_t *ofp = fp;
uint32_t kind;
ssize_t offset;
ctf_next_t *i = *it;
if (!i)
{
const ctf_type_t *tp;
ctf_dtdef_t *dtd;
ssize_t increment;
if ((type = ctf_type_resolve (fp, type)) == CTF_ERR)
return -1; /* errno is set for us. */
if ((tp = ctf_lookup_by_id (&fp, type)) == NULL)
return -1; /* errno is set for us. */
if ((i = ctf_next_create ()) == NULL)
return ctf_set_errno (ofp, ENOMEM);
i->cu.ctn_fp = ofp;
(void) ctf_get_ctt_size (fp, tp, &i->ctn_size, &increment);
kind = LCTF_INFO_KIND (fp, tp->ctt_info);
if (kind != CTF_K_STRUCT && kind != CTF_K_UNION)
{
ctf_next_destroy (i);
return (ctf_set_errno (ofp, ECTF_NOTSOU));
}
dtd = ctf_dynamic_type (fp, type);
i->ctn_iter_fun = (void (*) (void)) ctf_member_next;
/* We depend below on the RDWR state indicating whether the DTD-related
fields or the DMD-related fields have been initialized. */
assert ((dtd && (fp->ctf_flags & LCTF_RDWR))
|| (!dtd && (!(fp->ctf_flags & LCTF_RDWR))));
if (dtd == NULL)
{
i->ctn_n = LCTF_INFO_VLEN (fp, tp->ctt_info);
if (i->ctn_size < CTF_LSTRUCT_THRESH)
i->u.ctn_mp = (const ctf_member_t *) ((uintptr_t) tp + increment);
else
i->u.ctn_lmp = (const ctf_lmember_t *) ((uintptr_t) tp + increment);
}
else
i->u.ctn_dmd = ctf_list_next (&dtd->dtd_u.dtu_members);
*it = i;
}
if ((void (*) (void)) ctf_member_next != i->ctn_iter_fun)
return (ctf_set_errno (ofp, ECTF_NEXT_WRONGFUN));
if (ofp != i->cu.ctn_fp)
return (ctf_set_errno (ofp, ECTF_NEXT_WRONGFP));
/* Resolve to the native dict of this type. */
if ((fp = ctf_get_dict (ofp, type)) == NULL)
return (ctf_set_errno (ofp, ECTF_NOPARENT));
/* When we hit an unnamed struct/union member, we set ctn_type to indicate
that we are inside one, then return the unnamed member: on the next call,
we must skip over top-level member iteration in favour of iteration within
the sub-struct until it later turns out that that iteration has ended. */
retry:
if (!i->ctn_type)
{
if (!(fp->ctf_flags & LCTF_RDWR))
{
if (i->ctn_n == 0)
goto end_iter;
if (i->ctn_size < CTF_LSTRUCT_THRESH)
{
const char *membname = ctf_strptr (fp, i->u.ctn_mp->ctm_name);
if (name)
*name = membname;
if (membtype)
*membtype = i->u.ctn_mp->ctm_type;
offset = i->u.ctn_mp->ctm_offset;
if (membname[0] == 0
&& (ctf_type_kind (fp, i->u.ctn_mp->ctm_type) == CTF_K_STRUCT
|| ctf_type_kind (fp, i->u.ctn_mp->ctm_type) == CTF_K_UNION))
i->ctn_type = i->u.ctn_mp->ctm_type;
i->u.ctn_mp++;
}
else
{
const char *membname = ctf_strptr (fp, i->u.ctn_lmp->ctlm_name);
if (name)
*name = membname;
if (membtype)
*membtype = i->u.ctn_lmp->ctlm_type;
offset = (unsigned long) CTF_LMEM_OFFSET (i->u.ctn_lmp);
if (membname[0] == 0
&& (ctf_type_kind (fp, i->u.ctn_lmp->ctlm_type) == CTF_K_STRUCT
|| ctf_type_kind (fp, i->u.ctn_lmp->ctlm_type) == CTF_K_UNION))
i->ctn_type = i->u.ctn_lmp->ctlm_type;
i->u.ctn_lmp++;
}
i->ctn_n--;
}
else
{
if (i->u.ctn_dmd == NULL)
goto end_iter;
/* The dmd contains a NULL for unnamed dynamic members. Don't inflict
this on our callers. */
if (name)
{
if (i->u.ctn_dmd->dmd_name)
*name = i->u.ctn_dmd->dmd_name;
else
*name = "";
}
if (membtype)
*membtype = i->u.ctn_dmd->dmd_type;
offset = i->u.ctn_dmd->dmd_offset;
if (i->u.ctn_dmd->dmd_name == NULL
&& (ctf_type_kind (fp, i->u.ctn_dmd->dmd_type) == CTF_K_STRUCT
|| ctf_type_kind (fp, i->u.ctn_dmd->dmd_type) == CTF_K_UNION))
i->ctn_type = i->u.ctn_dmd->dmd_type;
i->u.ctn_dmd = ctf_list_next (i->u.ctn_dmd);
}
/* The callers might want automatic recursive sub-struct traversal. */
if (!(flags & CTF_MN_RECURSE))
i->ctn_type = 0;
/* Sub-struct traversal starting? Take note of the offset of this member,
for later boosting of sub-struct members' offsets. */
if (i->ctn_type)
i->ctn_increment = offset;
}
/* Traversing a sub-struct? Just return it, with the offset adjusted. */
else
{
ssize_t ret = ctf_member_next (fp, i->ctn_type, &i->ctn_next, name,
membtype, flags);
if (ret >= 0)
return ret + i->ctn_increment;
if (ctf_errno (fp) != ECTF_NEXT_END)
{
ctf_next_destroy (i);
*it = NULL;
i->ctn_type = 0;
return ret; /* errno is set for us. */
}
if (!ctf_assert (fp, (i->ctn_next == NULL)))
return -1; /* errno is set for us. */
i->ctn_type = 0;
/* This sub-struct has ended: on to the next real member. */
goto retry;
}
return offset;
end_iter:
ctf_next_destroy (i);
*it = NULL;
return ctf_set_errno (ofp, ECTF_NEXT_END);
}
/* Iterate over the members of an ENUM. We pass the string name and associated
integer value of each enum element to the specified callback function. */
int
ctf_enum_iter (ctf_dict_t *fp, ctf_id_t type, ctf_enum_f *func, void *arg)
{
ctf_next_t *i = NULL;
const char *name;
int val;
while ((name = ctf_enum_next (fp, type, &i, &val)) != NULL)
{
int rc;
if ((rc = func (name, val, arg)) != 0)
{
ctf_next_destroy (i);
return rc;
}
}
if (ctf_errno (fp) != ECTF_NEXT_END)
return -1; /* errno is set for us. */
return 0;
}
/* Iterate over the members of an enum TYPE, returning each enumerand's NAME or
NULL at end of iteration or error, and optionally passing back the
enumerand's integer VALue. */
const char *
ctf_enum_next (ctf_dict_t *fp, ctf_id_t type, ctf_next_t **it,
int *val)
{
ctf_dict_t *ofp = fp;
uint32_t kind;
const char *name;
ctf_next_t *i = *it;
if (!i)
{
const ctf_type_t *tp;
ctf_dtdef_t *dtd;
if ((type = ctf_type_resolve_unsliced (fp, type)) == CTF_ERR)
return NULL; /* errno is set for us. */
if ((tp = ctf_lookup_by_id (&fp, type)) == NULL)
return NULL; /* errno is set for us. */
if ((i = ctf_next_create ()) == NULL)
{
ctf_set_errno (ofp, ENOMEM);
return NULL;
}
i->cu.ctn_fp = ofp;
(void) ctf_get_ctt_size (fp, tp, NULL,
&i->ctn_increment);
kind = LCTF_INFO_KIND (fp, tp->ctt_info);
if (kind != CTF_K_ENUM)
{
ctf_next_destroy (i);
ctf_set_errno (ofp, ECTF_NOTENUM);
return NULL;
}
dtd = ctf_dynamic_type (fp, type);
i->ctn_iter_fun = (void (*) (void)) ctf_enum_next;
/* We depend below on the RDWR state indicating whether the DTD-related
fields or the DMD-related fields have been initialized. */
assert ((dtd && (fp->ctf_flags & LCTF_RDWR))
|| (!dtd && (!(fp->ctf_flags & LCTF_RDWR))));
if (dtd == NULL)
{
i->ctn_n = LCTF_INFO_VLEN (fp, tp->ctt_info);
i->u.ctn_en = (const ctf_enum_t *) ((uintptr_t) tp +
i->ctn_increment);
}
else
i->u.ctn_dmd = ctf_list_next (&dtd->dtd_u.dtu_members);
*it = i;
}
if ((void (*) (void)) ctf_enum_next != i->ctn_iter_fun)
{
ctf_set_errno (ofp, ECTF_NEXT_WRONGFUN);
return NULL;
}
if (ofp != i->cu.ctn_fp)
{
ctf_set_errno (ofp, ECTF_NEXT_WRONGFP);
return NULL;
}
/* Resolve to the native dict of this type. */
if ((fp = ctf_get_dict (ofp, type)) == NULL)
{
ctf_set_errno (ofp, ECTF_NOPARENT);
return NULL;
}
if (!(fp->ctf_flags & LCTF_RDWR))
{
if (i->ctn_n == 0)
goto end_iter;
name = ctf_strptr (fp, i->u.ctn_en->cte_name);
if (val)
*val = i->u.ctn_en->cte_value;
i->u.ctn_en++;
i->ctn_n--;
}
else
{
if (i->u.ctn_dmd == NULL)
goto end_iter;
name = i->u.ctn_dmd->dmd_name;
if (val)
*val = i->u.ctn_dmd->dmd_value;
i->u.ctn_dmd = ctf_list_next (i->u.ctn_dmd);
}
return name;
end_iter:
ctf_next_destroy (i);
*it = NULL;
ctf_set_errno (ofp, ECTF_NEXT_END);
return NULL;
}
/* Iterate over every root (user-visible) type in the given CTF dict.
We pass the type ID of each type to the specified callback function.
Does not traverse parent types: you have to do that explicitly. This is by
design, to avoid traversing them more than once if traversing many children
of a single parent. */
int
ctf_type_iter (ctf_dict_t *fp, ctf_type_f *func, void *arg)
{
ctf_next_t *i = NULL;
ctf_id_t type;
while ((type = ctf_type_next (fp, &i, NULL, 0)) != CTF_ERR)
{
int rc;
if ((rc = func (type, arg)) != 0)
{
ctf_next_destroy (i);
return rc;
}
}
if (ctf_errno (fp) != ECTF_NEXT_END)
return -1; /* errno is set for us. */
return 0;
}
/* Iterate over every type in the given CTF dict, user-visible or not.
We pass the type ID of each type to the specified callback function.
Does not traverse parent types: you have to do that explicitly. This is by
design, to avoid traversing them more than once if traversing many children
of a single parent. */
int
ctf_type_iter_all (ctf_dict_t *fp, ctf_type_all_f *func, void *arg)
{
ctf_next_t *i = NULL;
ctf_id_t type;
int flag;
while ((type = ctf_type_next (fp, &i, &flag, 1)) != CTF_ERR)
{
int rc;
if ((rc = func (type, flag, arg)) != 0)
{
ctf_next_destroy (i);
return rc;
}
}
if (ctf_errno (fp) != ECTF_NEXT_END)
return -1; /* errno is set for us. */
return 0;
}
/* Iterate over every type in the given CTF dict, optionally including
non-user-visible types, returning each type ID and hidden flag in turn.
Returns CTF_ERR on end of iteration or error.
Does not traverse parent types: you have to do that explicitly. This is by
design, to avoid traversing them more than once if traversing many children
of a single parent. */
ctf_id_t
ctf_type_next (ctf_dict_t *fp, ctf_next_t **it, int *flag, int want_hidden)
{
ctf_next_t *i = *it;
if (!i)
{
if ((i = ctf_next_create ()) == NULL)
return ctf_set_errno (fp, ENOMEM);
i->cu.ctn_fp = fp;
i->ctn_type = 1;
i->ctn_iter_fun = (void (*) (void)) ctf_type_next;
*it = i;
}
if ((void (*) (void)) ctf_type_next != i->ctn_iter_fun)
return (ctf_set_errno (fp, ECTF_NEXT_WRONGFUN));
if (fp != i->cu.ctn_fp)
return (ctf_set_errno (fp, ECTF_NEXT_WRONGFP));
while (i->ctn_type <= fp->ctf_typemax)
{
const ctf_type_t *tp = LCTF_INDEX_TO_TYPEPTR (fp, i->ctn_type);
if ((!want_hidden) && (!LCTF_INFO_ISROOT (fp, tp->ctt_info)))
{
i->ctn_type++;
continue;
}
if (flag)
*flag = LCTF_INFO_ISROOT (fp, tp->ctt_info);
return LCTF_INDEX_TO_TYPE (fp, i->ctn_type++, fp->ctf_flags & LCTF_CHILD);
}
ctf_next_destroy (i);
*it = NULL;
return ctf_set_errno (fp, ECTF_NEXT_END);
}
/* Iterate over every variable in the given CTF dict, in arbitrary order.
We pass the name of each variable to the specified callback function. */
int
ctf_variable_iter (ctf_dict_t *fp, ctf_variable_f *func, void *arg)
{
ctf_next_t *i = NULL;
ctf_id_t type;
const char *name;
while ((type = ctf_variable_next (fp, &i, &name)) != CTF_ERR)
{
int rc;
if ((rc = func (name, type, arg)) != 0)
{
ctf_next_destroy (i);
return rc;
}
}
if (ctf_errno (fp) != ECTF_NEXT_END)
return -1; /* errno is set for us. */
return 0;
}
/* Iterate over every variable in the given CTF dict, in arbitrary order,
returning the name and type of each variable in turn. The name argument is
not optional. Returns CTF_ERR on end of iteration or error. */
ctf_id_t
ctf_variable_next (ctf_dict_t *fp, ctf_next_t **it, const char **name)
{
ctf_next_t *i = *it;
if ((fp->ctf_flags & LCTF_CHILD) && (fp->ctf_parent == NULL))
return (ctf_set_errno (fp, ECTF_NOPARENT));
if (!i)
{
if ((i = ctf_next_create ()) == NULL)
return ctf_set_errno (fp, ENOMEM);
i->cu.ctn_fp = fp;
i->ctn_iter_fun = (void (*) (void)) ctf_variable_next;
if (fp->ctf_flags & LCTF_RDWR)
i->u.ctn_dvd = ctf_list_next (&fp->ctf_dvdefs);
*it = i;
}
if ((void (*) (void)) ctf_variable_next != i->ctn_iter_fun)
return (ctf_set_errno (fp, ECTF_NEXT_WRONGFUN));
if (fp != i->cu.ctn_fp)
return (ctf_set_errno (fp, ECTF_NEXT_WRONGFP));
if (!(fp->ctf_flags & LCTF_RDWR))
{
if (i->ctn_n >= fp->ctf_nvars)
goto end_iter;
*name = ctf_strptr (fp, fp->ctf_vars[i->ctn_n].ctv_name);
return fp->ctf_vars[i->ctn_n++].ctv_type;
}
else
{
ctf_id_t id;
if (i->u.ctn_dvd == NULL)
goto end_iter;
*name = i->u.ctn_dvd->dvd_name;
id = i->u.ctn_dvd->dvd_type;
i->u.ctn_dvd = ctf_list_next (i->u.ctn_dvd);
return id;
}
end_iter:
ctf_next_destroy (i);
*it = NULL;
return ctf_set_errno (fp, ECTF_NEXT_END);
}
/* Follow a given type through the graph for TYPEDEF, VOLATILE, CONST, and
RESTRICT nodes until we reach a "base" type node. This is useful when
we want to follow a type ID to a node that has members or a size. To guard
against infinite loops, we implement simplified cycle detection and check
each link against itself, the previous node, and the topmost node.
Does not drill down through slices to their contained type.
Callers of this function must not presume that a type it returns must have a
valid ctt_size: forwards do not, and must be separately handled. */
ctf_id_t
ctf_type_resolve (ctf_dict_t *fp, ctf_id_t type)
{
ctf_id_t prev = type, otype = type;
ctf_dict_t *ofp = fp;
const ctf_type_t *tp;
if (type == 0)
return (ctf_set_errno (ofp, ECTF_NONREPRESENTABLE));
while ((tp = ctf_lookup_by_id (&fp, type)) != NULL)
{
switch (LCTF_INFO_KIND (fp, tp->ctt_info))
{
case CTF_K_TYPEDEF:
case CTF_K_VOLATILE:
case CTF_K_CONST:
case CTF_K_RESTRICT:
if (tp->ctt_type == type || tp->ctt_type == otype
|| tp->ctt_type == prev)
{
ctf_err_warn (ofp, 0, ECTF_CORRUPT, _("type %lx cycle detected"),
otype);
return (ctf_set_errno (ofp, ECTF_CORRUPT));
}
prev = type;
type = tp->ctt_type;
break;
default:
return type;
}
if (type == 0)
return (ctf_set_errno (ofp, ECTF_NONREPRESENTABLE));
}
return CTF_ERR; /* errno is set for us. */
}
/* Like ctf_type_resolve(), but traverse down through slices to their contained
type. */
ctf_id_t
ctf_type_resolve_unsliced (ctf_dict_t *fp, ctf_id_t type)
{
const ctf_type_t *tp;
if ((type = ctf_type_resolve (fp, type)) == CTF_ERR)
return -1;
if ((tp = ctf_lookup_by_id (&fp, type)) == NULL)
return CTF_ERR; /* errno is set for us. */
if ((LCTF_INFO_KIND (fp, tp->ctt_info)) == CTF_K_SLICE)
return ctf_type_reference (fp, type);
return type;
}
/* Return the native dict of a given type: if called on a child and the
type is in the parent, return the parent. Needed if you plan to access
the type directly, without using the API. */
ctf_dict_t *
ctf_get_dict (ctf_dict_t *fp, ctf_id_t type)
{
if ((fp->ctf_flags & LCTF_CHILD) && LCTF_TYPE_ISPARENT (fp, type))
return fp->ctf_parent;
return fp;
}
/* Look up a name in the given name table, in the appropriate hash given the
kind of the identifier. The name is a raw, undecorated identifier. */
ctf_id_t ctf_lookup_by_rawname (ctf_dict_t *fp, int kind, const char *name)
{
return ctf_lookup_by_rawhash (fp, ctf_name_table (fp, kind), name);
}
/* Look up a name in the given name table, in the appropriate hash given the
readability state of the dictionary. The name is a raw, undecorated
identifier. */
ctf_id_t ctf_lookup_by_rawhash (ctf_dict_t *fp, ctf_names_t *np, const char *name)
{
ctf_id_t id;
if (fp->ctf_flags & LCTF_RDWR)
id = (ctf_id_t) (uintptr_t) ctf_dynhash_lookup (np->ctn_writable, name);
else
id = ctf_hash_lookup_type (np->ctn_readonly, fp, name);
return id;
}
/* Lookup the given type ID and return its name as a new dynamically-allocated
string. */
char *
ctf_type_aname (ctf_dict_t *fp, ctf_id_t type)
{
ctf_decl_t cd;
ctf_decl_node_t *cdp;
ctf_decl_prec_t prec, lp, rp;
int ptr, arr;
uint32_t k;
char *buf;
if (fp == NULL && type == CTF_ERR)
return NULL; /* Simplify caller code by permitting CTF_ERR. */
ctf_decl_init (&cd);
ctf_decl_push (&cd, fp, type);
if (cd.cd_err != 0)
{
ctf_decl_fini (&cd);
ctf_set_errno (fp, cd.cd_err);
return NULL;
}
/* If the type graph's order conflicts with lexical precedence order
for pointers or arrays, then we need to surround the declarations at
the corresponding lexical precedence with parentheses. This can
result in either a parenthesized pointer (*) as in int (*)() or
int (*)[], or in a parenthesized pointer and array as in int (*[])(). */
ptr = cd.cd_order[CTF_PREC_POINTER] > CTF_PREC_POINTER;
arr = cd.cd_order[CTF_PREC_ARRAY] > CTF_PREC_ARRAY;
rp = arr ? CTF_PREC_ARRAY : ptr ? CTF_PREC_POINTER : -1;
lp = ptr ? CTF_PREC_POINTER : arr ? CTF_PREC_ARRAY : -1;
k = CTF_K_POINTER; /* Avoid leading whitespace (see below). */
for (prec = CTF_PREC_BASE; prec < CTF_PREC_MAX; prec++)
{
for (cdp = ctf_list_next (&cd.cd_nodes[prec]);
cdp != NULL; cdp = ctf_list_next (cdp))
{
ctf_dict_t *rfp = fp;
const ctf_type_t *tp = ctf_lookup_by_id (&rfp, cdp->cd_type);
const char *name = ctf_strptr (rfp, tp->ctt_name);
if (k != CTF_K_POINTER && k != CTF_K_ARRAY)
ctf_decl_sprintf (&cd, " ");
if (lp == prec)
{
ctf_decl_sprintf (&cd, "(");
lp = -1;
}
switch (cdp->cd_kind)
{
case CTF_K_INTEGER:
case CTF_K_FLOAT:
case CTF_K_TYPEDEF:
/* Integers, floats, and typedefs must always be named types. */
if (name[0] == '\0')
{
ctf_set_errno (fp, ECTF_CORRUPT);
ctf_decl_fini (&cd);
return NULL;
}
ctf_decl_sprintf (&cd, "%s", name);
break;
case CTF_K_POINTER:
ctf_decl_sprintf (&cd, "*");
break;
case CTF_K_ARRAY:
ctf_decl_sprintf (&cd, "[%u]", cdp->cd_n);
break;
case CTF_K_FUNCTION:
{
size_t i;
ctf_funcinfo_t fi;
ctf_id_t *argv = NULL;
if (ctf_func_type_info (rfp, cdp->cd_type, &fi) < 0)
goto err; /* errno is set for us. */
if ((argv = calloc (fi.ctc_argc, sizeof (ctf_id_t *))) == NULL)
{
ctf_set_errno (rfp, errno);
goto err;
}
if (ctf_func_type_args (rfp, cdp->cd_type,
fi.ctc_argc, argv) < 0)
goto err; /* errno is set for us. */
ctf_decl_sprintf (&cd, "(*) (");
for (i = 0; i < fi.ctc_argc; i++)
{
char *arg = ctf_type_aname (rfp, argv[i]);
if (arg == NULL)
goto err; /* errno is set for us. */
ctf_decl_sprintf (&cd, "%s", arg);
free (arg);
if ((i < fi.ctc_argc - 1)
|| (fi.ctc_flags & CTF_FUNC_VARARG))
ctf_decl_sprintf (&cd, ", ");
}
if (fi.ctc_flags & CTF_FUNC_VARARG)
ctf_decl_sprintf (&cd, "...");
ctf_decl_sprintf (&cd, ")");
free (argv);
break;
err:
free (argv);
ctf_decl_fini (&cd);
return NULL;
}
break;
case CTF_K_STRUCT:
ctf_decl_sprintf (&cd, "struct %s", name);
break;
case CTF_K_UNION:
ctf_decl_sprintf (&cd, "union %s", name);
break;
case CTF_K_ENUM:
ctf_decl_sprintf (&cd, "enum %s", name);
break;
case CTF_K_FORWARD:
{
switch (ctf_type_kind_forwarded (fp, cdp->cd_type))
{
case CTF_K_STRUCT:
ctf_decl_sprintf (&cd, "struct %s", name);
break;
case CTF_K_UNION:
ctf_decl_sprintf (&cd, "union %s", name);
break;
case CTF_K_ENUM:
ctf_decl_sprintf (&cd, "enum %s", name);
break;
default:
ctf_set_errno (fp, ECTF_CORRUPT);
ctf_decl_fini (&cd);
return NULL;
}
break;
}
case CTF_K_VOLATILE:
ctf_decl_sprintf (&cd, "volatile");
break;
case CTF_K_CONST:
ctf_decl_sprintf (&cd, "const");
break;
case CTF_K_RESTRICT:
ctf_decl_sprintf (&cd, "restrict");
break;
}
k = cdp->cd_kind;
}
if (rp == prec)
ctf_decl_sprintf (&cd, ")");
}
if (cd.cd_enomem)
(void) ctf_set_errno (fp, ENOMEM);
buf = ctf_decl_buf (&cd);
ctf_decl_fini (&cd);
return buf;
}
/* Lookup the given type ID and print a string name for it into buf. Return
the actual number of bytes (not including \0) needed to format the name. */
ssize_t
ctf_type_lname (ctf_dict_t *fp, ctf_id_t type, char *buf, size_t len)
{
char *str = ctf_type_aname (fp, type);
size_t slen;
if (str == NULL)
return CTF_ERR; /* errno is set for us. */
slen = strlen (str);
snprintf (buf, len, "%s", str);
free (str);
if (slen >= len)
(void) ctf_set_errno (fp, ECTF_NAMELEN);
return slen;
}
/* Lookup the given type ID and print a string name for it into buf. If buf
is too small, return NULL: the ECTF_NAMELEN error is set on 'fp' for us. */
char *
ctf_type_name (ctf_dict_t *fp, ctf_id_t type, char *buf, size_t len)
{
ssize_t rv = ctf_type_lname (fp, type, buf, len);
return (rv >= 0 && (size_t) rv < len ? buf : NULL);
}
/* Lookup the given type ID and return its raw, unadorned, undecorated name.
The name will live as long as its ctf_dict_t does.
The only decoration is that a NULL return always means an error: nameless
types return a null string. */
const char *
ctf_type_name_raw (ctf_dict_t *fp, ctf_id_t type)
{
const ctf_type_t *tp;
if ((tp = ctf_lookup_by_id (&fp, type)) == NULL)
return NULL; /* errno is set for us. */
if (tp->ctt_name == 0)
return "";
return ctf_strraw (fp, tp->ctt_name);
}
/* Lookup the given type ID and return its raw, unadorned, undecorated name as a
new dynamically-allocated string. */
char *
ctf_type_aname_raw (ctf_dict_t *fp, ctf_id_t type)
{
const char *name = ctf_type_name_raw (fp, type);
if (name != NULL)
return strdup (name);
return NULL;
}
/* Resolve the type down to a base type node, and then return the size
of the type storage in bytes. */
ssize_t
ctf_type_size (ctf_dict_t *fp, ctf_id_t type)
{
ctf_dict_t *ofp = fp;
const ctf_type_t *tp;
ssize_t size;
ctf_arinfo_t ar;
if ((type = ctf_type_resolve (fp, type)) == CTF_ERR)
return -1; /* errno is set for us. */
if ((tp = ctf_lookup_by_id (&fp, type)) == NULL)
return -1; /* errno is set for us. */
switch (LCTF_INFO_KIND (fp, tp->ctt_info))
{
case CTF_K_POINTER:
return fp->ctf_dmodel->ctd_pointer;
case CTF_K_FUNCTION:
return 0; /* Function size is only known by symtab. */
case CTF_K_ENUM:
return fp->ctf_dmodel->ctd_int;
case CTF_K_ARRAY:
/* ctf_add_array() does not directly encode the element size, but
requires the user to multiply to determine the element size.
If ctf_get_ctt_size() returns nonzero, then use the recorded
size instead. */
if ((size = ctf_get_ctt_size (fp, tp, NULL, NULL)) > 0)
return size;
if (ctf_array_info (ofp, type, &ar) < 0
|| (size = ctf_type_size (ofp, ar.ctr_contents)) < 0)
return -1; /* errno is set for us. */
return size * ar.ctr_nelems;
case CTF_K_FORWARD:
/* Forwards do not have a meaningful size. */
return (ctf_set_errno (ofp, ECTF_INCOMPLETE));
default: /* including slices of enums, etc */
return (ctf_get_ctt_size (fp, tp, NULL, NULL));
}
}
/* Resolve the type down to a base type node, and then return the alignment
needed for the type storage in bytes.
XXX may need arch-dependent attention. */
ssize_t
ctf_type_align (ctf_dict_t *fp, ctf_id_t type)
{
const ctf_type_t *tp;
ctf_dict_t *ofp = fp;
int kind;
if ((type = ctf_type_resolve (fp, type)) == CTF_ERR)
return -1; /* errno is set for us. */
if ((tp = ctf_lookup_by_id (&fp, type)) == NULL)
return -1; /* errno is set for us. */