// SPDX-License-Identifier: GPL-2.0-or-later
/*
* dwarf-aux.c : libdw auxiliary interfaces
*/
#include <errno.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdlib.h>
#include "debug.h"
#include "dwarf-aux.h"
#include "strbuf.h"
#include "string2.h"
/**
* cu_find_realpath - Find the realpath of the target file
* @cu_die: A DIE(dwarf information entry) of CU(compilation Unit)
* @fname: The tail filename of the target file
*
* Find the real(long) path of @fname in @cu_die.
*/
const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname)
{
Dwarf_Files *files;
size_t nfiles, i;
const char *src = NULL;
int ret;
if (!fname)
return NULL;
ret = dwarf_getsrcfiles(cu_die, &files, &nfiles);
if (ret != 0)
return NULL;
for (i = 0; i < nfiles; i++) {
src = dwarf_filesrc(files, i, NULL, NULL);
if (strtailcmp(src, fname) == 0)
break;
}
if (i == nfiles)
return NULL;
return src;
}
/**
* cu_get_comp_dir - Get the path of compilation directory
* @cu_die: a CU DIE
*
* Get the path of compilation directory of given @cu_die.
* Since this depends on DW_AT_comp_dir, older gcc will not
* embedded it. In that case, this returns NULL.
*/
const char *cu_get_comp_dir(Dwarf_Die *cu_die)
{
Dwarf_Attribute attr;
if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL)
return NULL;
return dwarf_formstring(&attr);
}
/* Unlike dwarf_getsrc_die(), cu_getsrc_die() only returns statement line */
static Dwarf_Line *cu_getsrc_die(Dwarf_Die *cu_die, Dwarf_Addr addr)
{
Dwarf_Addr laddr;
Dwarf_Lines *lines;
Dwarf_Line *line;
size_t nlines, l, u, n;
