/*-
* Copyright (c) 2007 John Birrell (jb@freebsd.org)
* Copyright (c) 2009-2011 Kai Wang
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "_libdwarf.h"
ELFTC_VCSID("$Id: libdwarf_abbrev.c 3136 2014-12-24 16:04:38Z kaiwang27 $");
int
_dwarf_abbrev_add(Dwarf_CU cu, uint64_t entry, uint64_t tag, uint8_t children,
uint64_t aboff, Dwarf_Abbrev *abp, Dwarf_Error *error)
{
Dwarf_Abbrev ab;
Dwarf_Debug dbg;
dbg = cu != NULL ? cu->cu_dbg : NULL;
if ((ab = malloc(sizeof(struct _Dwarf_Abbrev))) == NULL) {
DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
return (DW_DLE_MEMORY);
}
/* Initialise the abbrev structure. */
ab->ab_entry = entry;
ab->ab_tag = tag;
ab->ab_children = children;
ab->ab_offset = aboff;
ab->ab_length = 0; /* fill in later. */
ab->ab_atnum = 0; /* fill in later. */
/* Initialise the list of attribute definitions. */
STAILQ_INIT(&ab->ab_attrdef);
/* Add the abbrev to the hash table of the compilation unit. */
if (cu != NULL)
HASH_ADD(ab_hh, cu->cu_abbrev_hash, ab_entry,
sizeof(ab->ab_entry), ab);
if (abp != NULL)
*abp = ab;
return (DW_DLE_NONE);
}
int
_dwarf_attrdef_add(Dwarf_Debug dbg, Dwarf_Abbrev ab, uint64_t attr,
uint64_t form, uint64_t adoff, Dwarf_AttrDef *adp, Dwarf_Error *error)
{
Dwarf_AttrDef ad;
if (ab == NULL) {
DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
return (DW_DLE_ARGUMENT);
}
if ((ad = malloc(sizeof(struct _Dwarf_AttrDef))) == NULL) {
DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
return (DW_DLE_MEMORY);
}
/* Initialise the attribute definition structure. */
ad->ad_attrib = attr;
ad->ad_form = form;
ad->ad_offset = adoff;
/* Add the attribute definition to the list in the abbrev. */
STAILQ_INSERT_TAIL(&ab->ab_attrdef, ad, ad_next);
/* Increase number of attribute counter. */
ab->ab_atnum++;
if (adp != NULL)
*adp = ad;
return (DW_DLE_NONE);
}
int
_dwarf_abbrev_parse(Dwarf_Debug dbg, Dwarf_CU cu, Dwarf_Unsigned *offset,
Dwarf_Abbrev *abp, Dwarf_Error *error)
{
Dwarf_Section *ds;
uint64_t attr;
uint64_t entry;
uint64_t form;
uint64_t aboff;
uint64_t adoff;
uint64_t tag;
uint8_t children;
int ret;
assert(abp != NULL);
ds = _dwarf_find_section(dbg, ".debug_abbrev");
assert(ds != NULL);
if (*offset >= ds->ds_size)
return (DW_DLE_NO_ENTRY);
aboff = *offset;
entry = _dwarf_read_uleb128(ds->ds_data, offset);
if (entry == 0) {
/* Last entry. */
ret = _dwarf_abbrev_add(cu, entry, 0, 0, aboff, abp,
error);
if (ret == DW_DLE_NONE) {
(*abp)->ab_length = 1;
return (ret);
} else
return (ret);
}
tag = _dwarf_read_uleb128(ds->ds_data, offset);
children = dbg->read(ds->ds_data, offset, 1);
if ((ret = _dwarf_abbrev_add(cu, entry, tag, children, aboff,
abp, error)) != DW_DLE_NONE)
return (ret);
/* Parse attribute definitions. */
do {
adoff = *offset;
attr = _dwarf_read_uleb128(ds->ds_data, offset);
form = _dwarf_read_uleb128(ds->ds_data, offset);
if (attr != 0)
if ((ret = _dwarf_attrdef_add(dbg, *abp, attr,
form, adoff, NULL, error)) != DW_DLE_NONE)
return (ret);
} while (attr != 0);
(*abp)->ab_length = *offset - aboff;
return (ret);
}
int
_dwarf_abbrev_find(Dwarf_CU cu, uint64_t entry, Dwarf_Abbrev *abp,
Dwarf_Error *error)
{
Dwarf_Abbrev ab;
Dwarf_Section *ds;
Dwarf_Unsigned offset;
int ret;
if (entry == 0)
return (DW_DLE_NO_ENTRY);
/* Check if the desired abbrev entry is already in the hash table. */
HASH_FIND(ab_hh, cu->cu_abbrev_hash, &entry, sizeof(entry), ab);
if (ab != NULL) {
*abp = ab;
return (DW_DLE_NONE);
}
if (cu->cu_abbrev_loaded) {
return (DW_DLE_NO_ENTRY);
}
/* Load and search the abbrev table. */
ds = _dwarf_find_section(cu->cu_dbg, ".debug_abbrev");
if (ds == NULL)
return (DW_DLE_NO_ENTRY);
offset = cu->cu_abbrev_offset_cur;
while (offset < ds->ds_size) {
ret = _dwarf_abbrev_parse(cu->cu_dbg, cu, &offset, &ab, error);
if (ret != DW_DLE_NONE)
return (ret);
if (ab->ab_entry == entry) {
cu->cu_abbrev_offset_cur = offset;
*abp = ab;
return (DW_DLE_NONE);
}
if (ab->ab_entry == 0) {
cu->cu_abbrev_offset_cur = offset;
cu->cu_abbrev_loaded = 1;
break;
}
}
return (DW_DLE_NO_ENTRY);
}
void
_dwarf_abbrev_cleanup(Dwarf_CU cu)
{
Dwarf_Abbrev ab, tab;
Dwarf_AttrDef ad, tad;
assert(cu != NULL);
HASH_ITER(ab_hh, cu->cu_abbrev_hash, ab, tab) {
HASH_DELETE(ab_hh, cu->cu_abbrev_hash, ab);
STAILQ_FOREACH_SAFE(ad, &ab->ab_attrdef, ad_next, tad) {
STAILQ_REMOVE(&ab->ab_attrdef, ad, _Dwarf_AttrDef,
ad_next);
free(ad);
}
free(ab);
}
}
int
_dwarf_abbrev_gen(Dwarf_P_Debug dbg, Dwarf_Error *error)
{
Dwarf_CU cu;
Dwarf_Abbrev ab;
Dwarf_AttrDef ad;
Dwarf_P_Section ds;
int ret;
cu = STAILQ_FIRST(&dbg->dbg_cu);
if (cu == NULL)
return (DW_DLE_NONE);
/* Create .debug_abbrev section. */
if ((ret = _dwarf_section_init(dbg, &ds, ".debug_abbrev", 0, error)) !=
DW_DLE_NONE)
return (ret);
for (ab = cu->cu_abbrev_hash; ab != NULL; ab = ab->ab_hh.next) {
RCHECK(WRITE_ULEB128(ab->ab_entry));
RCHECK(WRITE_ULEB128(ab->ab_tag));
RCHECK(WRITE_VALUE(ab->ab_children, 1));
STAILQ_FOREACH(ad, &ab->ab_attrdef, ad_next) {
RCHECK(WRITE_ULEB128(ad->ad_attrib));
RCHECK(WRITE_ULEB128(ad->ad_form));
}
/* Signal end of attribute spec list. */
RCHECK(WRITE_ULEB128(0));
RCHECK(WRITE_ULEB128(0));
}
/* End of abbreviation for this CU. */
RCHECK(WRITE_ULEB128(0));
/* Notify the creation of .debug_abbrev ELF section. */
RCHECK(_dwarf_section_callback(dbg, ds, SHT_PROGBITS, 0, 0, 0, error));
return (DW_DLE_NONE);
gen_fail:
_dwarf_section_free(dbg, &ds);
return (ret);
}
