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c550e7ba93
We were sometimes printing hex values without prefixing them with '0x', leading to confusion about what base the numbers were actually in. libctf/ * ctf-dump.c (ctf_dump_format_type): Prefix hex strings with 0x. (ctf_dump_funcs): Likewise.
598 lines
14 KiB
C
598 lines
14 KiB
C
/* Textual dumping of CTF data.
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of libctf.
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libctf is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not see
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<http://www.gnu.org/licenses/>. */
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#include <ctf-impl.h>
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#include <string.h>
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/* One item to be dumped, in string form. */
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typedef struct ctf_dump_item
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{
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ctf_list_t cdi_list;
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char *cdi_item;
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} ctf_dump_item_t;
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/* Cross-call state for dumping. Basically just enough to track the section in
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use and a list of return strings. */
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struct ctf_dump_state
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{
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ctf_sect_names_t cds_sect;
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ctf_file_t *cds_fp;
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ctf_dump_item_t *cds_current;
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ctf_list_t cds_items;
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};
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/* Cross-call state for ctf_dump_member. */
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typedef struct ctf_dump_membstate
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{
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char **cdm_str;
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ctf_file_t *cdm_fp;
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} ctf_dump_membstate_t;
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static int
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ctf_dump_append (ctf_dump_state_t *state, char *str)
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{
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ctf_dump_item_t *cdi;
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if ((cdi = ctf_alloc (sizeof (struct ctf_dump_item))) == NULL)
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return (ctf_set_errno (state->cds_fp, ENOMEM));
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cdi->cdi_item = str;
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ctf_list_append (&state->cds_items, cdi);
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return 0;
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}
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static void
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ctf_dump_free (ctf_dump_state_t *state)
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{
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ctf_dump_item_t *cdi, *next_cdi;
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if (state == NULL)
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return;
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for (cdi = ctf_list_next (&state->cds_items); cdi != NULL;
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cdi = next_cdi)
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{
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free (cdi->cdi_item);
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next_cdi = ctf_list_next (cdi);
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ctf_free (cdi);
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}
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}
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/* Slices need special handling to distinguish them from their referenced
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type. */
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static int
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ctf_is_slice (ctf_file_t *fp, ctf_id_t id, ctf_encoding_t *enc)
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{
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int kind = ctf_type_kind (fp, id);
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return (((kind == CTF_K_INTEGER) || (kind == CTF_K_ENUM)
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|| (kind == CTF_K_FLOAT))
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&& ctf_type_reference (fp, id) != CTF_ERR
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&& ctf_type_encoding (fp, id, enc) == 0);
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}
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/* Return a dump for a single type, without member info: but do show the
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type's references. */
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static char *
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ctf_dump_format_type (ctf_file_t *fp, ctf_id_t id)
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{
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ctf_id_t new_id;
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char *str = NULL, *bit = NULL, *buf = NULL;
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new_id = id;
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do
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{
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ctf_encoding_t enc;
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id = new_id;
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buf = ctf_type_aname (fp, id);
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if (!buf)
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goto oom;
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/* Slices get a different print representation. */
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if (ctf_is_slice (fp, id, &enc))
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{
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ctf_type_encoding (fp, id, &enc);
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if (asprintf (&bit, " %lx: [slice 0x%x:0x%x]",
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id, enc.cte_offset, enc.cte_bits) < 0)
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goto oom;
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}
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else
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{
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if (asprintf (&bit, " %lx: %s (size 0x%lx)", id, buf[0] == '\0' ?
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"(nameless)" : buf,
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(unsigned long) ctf_type_size (fp, id)) < 0)
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goto oom;
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}
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free (buf);
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buf = NULL;
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str = ctf_str_append (str, bit);
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free (bit);
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bit = NULL;
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new_id = ctf_type_reference (fp, id);
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if (new_id != CTF_ERR)
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str = ctf_str_append (str, " ->");
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} while (new_id != CTF_ERR);
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if (ctf_errno (fp) != ECTF_NOTREF)
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{
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free (str);
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return NULL;
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}
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return str;
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oom:
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free (buf);
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free (str);
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free (bit);
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ctf_set_errno (fp, ENOMEM);
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return NULL;
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}
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/* Dump a single label into the cds_items. */
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static int
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ctf_dump_label (const char *name, const ctf_lblinfo_t *info,
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void *arg)
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{
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char *str;
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char *typestr;
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ctf_dump_state_t *state = arg;
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if (asprintf (&str, "%s -> ", name) < 0)
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return (ctf_set_errno (state->cds_fp, ENOMEM));
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if ((typestr = ctf_dump_format_type (state->cds_fp, info->ctb_type)) == NULL)
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{
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free (str);
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return -1; /* errno is set for us. */
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}
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str = ctf_str_append (str, typestr);
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free (typestr);
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ctf_dump_append (state, str);
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return 0;
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}
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/* Dump all the object entries into the cds_items. (There is no iterator for
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this section, so we just do it in a loop, and this function handles all of
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them, rather than only one. */
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static int
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ctf_dump_objts (ctf_file_t *fp, ctf_dump_state_t *state)
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{
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size_t i;
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for (i = 0; i < fp->ctf_nsyms; i++)
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{
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char *str;
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char *typestr;
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const char *sym_name;
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ctf_id_t type;
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if ((type = ctf_lookup_by_symbol (state->cds_fp, i)) == CTF_ERR)
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switch (ctf_errno (state->cds_fp))
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{
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/* Most errors are just an indication that this symbol is not a data
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symbol, but this one indicates that we were called wrong, on a
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CTF file with no associated symbol table. */
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case ECTF_NOSYMTAB:
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return -1;
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case ECTF_NOTDATA:
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case ECTF_NOTYPEDAT:
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continue;
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}
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/* Variable name. */
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sym_name = ctf_lookup_symbol_name (fp, i);
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if (sym_name[0] == '\0')
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{
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if (asprintf (&str, "%lx -> ", (unsigned long) i) < 0)
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return (ctf_set_errno (fp, ENOMEM));
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}
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else
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{
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if (asprintf (&str, "%s (%lx) -> ", sym_name, (unsigned long) i) < 0)
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return (ctf_set_errno (fp, ENOMEM));
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}
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/* Variable type. */
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if ((typestr = ctf_dump_format_type (state->cds_fp, type)) == NULL)
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{
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free (str);
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return -1; /* errno is set for us. */
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}
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str = ctf_str_append (str, typestr);
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free (typestr);
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ctf_dump_append (state, str);
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}
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return 0;
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}
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/* Dump all the function entries into the cds_items. (As above, there is no
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iterator for this section.) */
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static int
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ctf_dump_funcs (ctf_file_t *fp, ctf_dump_state_t *state)
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{
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size_t i;
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for (i = 0; i < fp->ctf_nsyms; i++)
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{
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char *str ;
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char *bit;
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const char *sym_name;
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ctf_funcinfo_t fi;
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ctf_id_t type;
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size_t j;
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ctf_id_t *args;
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if ((type = ctf_func_info (state->cds_fp, i, &fi)) == CTF_ERR)
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switch (ctf_errno (state->cds_fp))
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{
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/* Most errors are just an indication that this symbol is not a data
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symbol, but this one indicates that we were called wrong, on a
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CTF file with no associated symbol table. */
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case ECTF_NOSYMTAB:
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return -1;
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case ECTF_NOTDATA:
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case ECTF_NOTYPEDAT:
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continue;
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}
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if ((args = calloc (fi.ctc_argc, sizeof (ctf_id_t))) == NULL)
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return (ctf_set_errno (fp, ENOMEM));
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/* Return type. */
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if ((str = ctf_type_aname (state->cds_fp, type)) == NULL)
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goto err;
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str = ctf_str_append (str, " ");
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/* Function name. */
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sym_name = ctf_lookup_symbol_name (fp, i);
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if (sym_name[0] == '\0')
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{
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if (asprintf (&bit, "0x%lx ", (unsigned long) i) < 0)
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goto oom;
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}
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else
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{
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if (asprintf (&bit, "%s (0x%lx) ", sym_name, (unsigned long) i) < 0)
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goto oom;
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}
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str = ctf_str_append (str, bit);
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str = ctf_str_append (str, " (");
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free (bit);
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/* Function arguments. */
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if (ctf_func_args (state->cds_fp, i, fi.ctc_argc, args) < 0)
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goto err;
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for (j = 0; j < fi.ctc_argc; j++)
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{
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if ((bit = ctf_type_aname (state->cds_fp, args[j])) == NULL)
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goto err;
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str = ctf_str_append (str, bit);
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if ((j < fi.ctc_argc - 1) || (fi.ctc_flags & CTF_FUNC_VARARG))
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str = ctf_str_append (str, ", ");
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free (bit);
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}
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if (fi.ctc_flags & CTF_FUNC_VARARG)
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str = ctf_str_append (str, "...");
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str = ctf_str_append (str, ")");
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free (args);
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ctf_dump_append (state, str);
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continue;
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oom:
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free (args);
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free (str);
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return (ctf_set_errno (fp, ENOMEM));
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err:
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free (args);
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free (str);
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return -1; /* errno is set for us. */
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}
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return 0;
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}
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/* Dump a single variable into the cds_items. */
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static int
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ctf_dump_var (const char *name, ctf_id_t type, void *arg)
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{
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char *str;
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char *typestr;
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ctf_dump_state_t *state = arg;
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if (asprintf (&str, "%s -> ", name) < 0)
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return (ctf_set_errno (state->cds_fp, ENOMEM));
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if ((typestr = ctf_dump_format_type (state->cds_fp, type)) == NULL)
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{
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free (str);
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return -1; /* errno is set for us. */
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}
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str = ctf_str_append (str, typestr);
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free (typestr);
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ctf_dump_append (state, str);
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return 0;
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}
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/* Dump a single member into the string in the membstate. */
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static int
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ctf_dump_member (const char *name, ctf_id_t id, unsigned long offset,
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int depth, void *arg)
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{
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ctf_dump_membstate_t *state = arg;
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char *typestr = NULL;
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char *bit = NULL;
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ctf_encoding_t ep;
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ssize_t i;
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for (i = 0; i < depth; i++)
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*state->cdm_str = ctf_str_append (*state->cdm_str, " ");
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if ((typestr = ctf_type_aname (state->cdm_fp, id)) == NULL)
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goto oom;
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if (asprintf (&bit, " [0x%lx] (ID 0x%lx) (kind %i) %s %s (aligned at 0x%lx",
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offset, id, ctf_type_kind (state->cdm_fp, id), typestr, name,
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(unsigned long) ctf_type_align (state->cdm_fp, id)) < 0)
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goto oom;
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*state->cdm_str = ctf_str_append (*state->cdm_str, bit);
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free (typestr);
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free (bit);
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typestr = NULL;
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bit = NULL;
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if ((ctf_type_kind (state->cdm_fp, id) == CTF_K_INTEGER)
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|| (ctf_type_kind (state->cdm_fp, id) == CTF_K_FLOAT)
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|| (ctf_is_slice (state->cdm_fp, id, &ep) == CTF_K_ENUM))
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{
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ctf_type_encoding (state->cdm_fp, id, &ep);
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if (asprintf (&bit, ", format 0x%x, offset:bits 0x%x:0x%x", ep.cte_format,
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ep.cte_offset, ep.cte_bits) < 0)
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goto oom;
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*state->cdm_str = ctf_str_append (*state->cdm_str, bit);
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free (bit);
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bit = NULL;
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}
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*state->cdm_str = ctf_str_append (*state->cdm_str, ")\n");
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return 0;
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oom:
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free (typestr);
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free (bit);
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return (ctf_set_errno (state->cdm_fp, ENOMEM));
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}
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/* Dump a single type into the cds_items. */
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static int
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ctf_dump_type (ctf_id_t id, void *arg)
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{
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char *str;
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ctf_dump_state_t *state = arg;
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ctf_dump_membstate_t membstate = { &str, state->cds_fp };
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size_t len;
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if ((str = ctf_dump_format_type (state->cds_fp, id)) == NULL)
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goto err;
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str = ctf_str_append (str, "\n");
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if ((ctf_type_visit (state->cds_fp, id, ctf_dump_member, &membstate)) < 0)
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goto err;
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/* Trim off the last linefeed added by ctf_dump_member(). */
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len = strlen (str);
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if (str[len-1] == '\n')
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str[len-1] = '\0';
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ctf_dump_append (state, str);
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return 0;
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err:
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free (str);
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return -1; /* errno is set for us. */
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}
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/* Dump the string table into the cds_items. */
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static int
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ctf_dump_str (ctf_file_t *fp, ctf_dump_state_t *state)
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{
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const char *s = fp->ctf_str[CTF_STRTAB_0].cts_strs;
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for (; s < fp->ctf_str[CTF_STRTAB_0].cts_strs +
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fp->ctf_str[CTF_STRTAB_0].cts_len;)
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{
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char *str;
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if (asprintf (&str, "%lx: %s",
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(unsigned long) (s - fp->ctf_str[CTF_STRTAB_0].cts_strs),
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s) < 0)
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return (ctf_set_errno (fp, ENOMEM));
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ctf_dump_append (state, str);
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s += strlen (s) + 1;
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}
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return 0;
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}
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/* Dump a particular section of a CTF file, in textual form. Call with a
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pointer to a NULL STATE: each call emits a dynamically allocated string
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containing a description of one entity in the specified section, in order.
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Only the first call (with a NULL state) may vary SECT. Once the CTF section
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has been entirely dumped, the call returns NULL and frees and annuls the
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STATE, ready for another section to be dumped. The returned textual content
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may span multiple lines: between each call the FUNC is called with one
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textual line at a time, and should return a suitably decorated line (it can
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allocate a new one and return it if it likes). */
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char *
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ctf_dump (ctf_file_t *fp, ctf_dump_state_t **statep, ctf_sect_names_t sect,
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ctf_dump_decorate_f *func, void *arg)
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{
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char *str;
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char *line;
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ctf_dump_state_t *state = NULL;
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if (*statep == NULL)
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{
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/* Data collection. Transforming a call-at-a-time iterator into a
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return-at-a-time iterator in a language without call/cc is annoying. It
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is easiest to simply collect everything at once and then return it bit
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by bit. The first call will take (much) longer than otherwise, but the
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amortized time needed is the same. */
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if ((*statep = ctf_alloc (sizeof (struct ctf_dump_state))) == NULL)
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{
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ctf_set_errno (fp, ENOMEM);
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goto end;
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}
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state = *statep;
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memset (state, 0, sizeof (struct ctf_dump_state));
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state->cds_fp = fp;
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state->cds_sect = sect;
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switch (sect)
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{
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case CTF_SECT_HEADER:
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/* Nothing doable (yet): entire header is discarded after read-phase. */
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str = strdup ("");
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break;
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case CTF_SECT_LABEL:
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if (ctf_label_iter (fp, ctf_dump_label, state) < 0)
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{
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if (ctf_errno (fp) != ECTF_NOLABELDATA)
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goto end; /* errno is set for us. */
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ctf_set_errno (fp, 0);
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}
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break;
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|
case CTF_SECT_OBJT:
|
|
if (ctf_dump_objts (fp, state) < 0)
|
|
goto end; /* errno is set for us. */
|
|
break;
|
|
case CTF_SECT_FUNC:
|
|
if (ctf_dump_funcs (fp, state) < 0)
|
|
goto end; /* errno is set for us. */
|
|
break;
|
|
case CTF_SECT_VAR:
|
|
if (ctf_variable_iter (fp, ctf_dump_var, state) < 0)
|
|
goto end; /* errno is set for us. */
|
|
break;
|
|
case CTF_SECT_TYPE:
|
|
if (ctf_type_iter (fp, ctf_dump_type, state) < 0)
|
|
goto end; /* errno is set for us. */
|
|
break;
|
|
case CTF_SECT_STR:
|
|
ctf_dump_str (fp, state);
|
|
break;
|
|
default:
|
|
ctf_set_errno (fp, ECTF_DUMPSECTUNKNOWN);
|
|
goto end;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
state = *statep;
|
|
|
|
if (state->cds_sect != sect)
|
|
{
|
|
ctf_set_errno (fp, ECTF_DUMPSECTCHANGED);
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
if (state->cds_current == NULL)
|
|
state->cds_current = ctf_list_next (&state->cds_items);
|
|
else
|
|
state->cds_current = ctf_list_next (state->cds_current);
|
|
|
|
if (state->cds_current == NULL)
|
|
goto end;
|
|
|
|
/* Hookery. There is some extra complexity to preserve linefeeds within each
|
|
item while removing linefeeds at the end. */
|
|
if (func)
|
|
{
|
|
size_t len;
|
|
|
|
str = NULL;
|
|
for (line = state->cds_current->cdi_item; line && *line; )
|
|
{
|
|
char *nline = line;
|
|
char *ret;
|
|
|
|
nline = strchr (line, '\n');
|
|
if (nline)
|
|
nline[0] = '\0';
|
|
|
|
ret = func (sect, line, arg);
|
|
str = ctf_str_append (str, ret);
|
|
str = ctf_str_append (str, "\n");
|
|
if (ret != line)
|
|
free (ret);
|
|
|
|
if (nline)
|
|
{
|
|
nline[0] = '\n';
|
|
nline++;
|
|
}
|
|
|
|
line = nline;
|
|
}
|
|
|
|
len = strlen (str);
|
|
|
|
if (str[len-1] == '\n')
|
|
str[len-1] = '\0';
|
|
}
|
|
else
|
|
str = strdup (state->cds_current->cdi_item);
|
|
|
|
ctf_set_errno (fp, 0);
|
|
return str;
|
|
|
|
end:
|
|
ctf_dump_free (state);
|
|
ctf_free (state);
|
|
ctf_set_errno (fp, 0);
|
|
*statep = NULL;
|
|
return NULL;
|
|
}
|