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/* Find line information for given file/line/column triple.
Copyright (C) 2005 Red Hat, Inc.
Written by Ulrich Drepper <drepper@redhat.com>, 2005.
This program is Open Source software; you can redistribute it and/or
modify it under the terms of the Open Software License version 1.0 as
published by the Open Source Initiative.
You should have received a copy of the Open Software License along
with this program; if not, you may obtain a copy of the Open Software
License version 1.0 from http://www.opensource.org/licenses/osl.php or
by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
3001 King Ranch Road, Ukiah, CA 95482. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include "libdwP.h"
int
dwarf_getsrc_file (Dwarf *dbg, const char *fname, int lineno, int column,
Dwarf_Line ***srcsp, size_t *nsrcs)
{
if (dbg == NULL)
return -1;
bool is_basename = strchr (fname, '/') == NULL;
size_t max_match = *nsrcs ?: ~0u;
size_t act_match = *nsrcs;
size_t cur_match = 0;
Dwarf_Line **match = *nsrcs == 0 ? NULL : *srcsp;
Dwarf_Off off = 0;
size_t cuhl;
Dwarf_Off noff;
while (INTUSE(dwarf_nextcu) (dbg, off, &noff, &cuhl, NULL, NULL, NULL) == 0)
{
Dwarf_Die cudie_mem;
Dwarf_Die *cudie = INTUSE(dwarf_offdie) (dbg, off + cuhl, &cudie_mem);
if (cudie == NULL)
continue;
/* Get the line number information for this file. */
Dwarf_Lines *lines;
size_t nlines;
if (INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines) != 0)
return -1;
/* Search through all the line number records for a matching
file and line/column number. If any of the numbers is zero,
no match is performed. */
unsigned int lastfile = UINT_MAX;
bool lastmatch = false;
for (size_t cnt = 0; cnt < nlines; ++cnt)
{
Dwarf_Line *line = &lines->info[cnt];
if (lastfile != line->file)
{
lastfile = line->file;
if (lastfile >= line->files->nfiles)
{
__libdw_seterrno (DWARF_E_INVALID_DWARF);
return -1;
}
/* Match the name with the name the user provided. */
const char *fname2 = line->files->info[lastfile].name;
if (is_basename)
lastmatch = strcmp (basename (fname2), fname) == 0;
else
lastmatch = strcmp (fname2, fname) == 0;
}
if (!lastmatch)
continue;
/* See whether line and possibly column match. */
if (lineno != 0
&& (lineno > line->line
|| (column != 0 && column > line->column)))
/* Cannot match. */
continue;
/* Determine whether this is the best match so far. */
size_t inner;
for (inner = 0; inner < cur_match; ++inner)
if (match[inner]->files == line->files
&& match[inner]->file == line->file)
break;
if (inner < cur_match
&& (match[inner]->line != line->line
|| match[inner]->line != lineno
|| (column != 0
&& (match[inner]->column != line->column
|| match[inner]->column != column))))
{
/* We know about this file already. If this is a better
match for the line number, use it. */
if (match[inner]->line >= line->line
&& (match[inner]->line != line->line
|| match[inner]->column >= line->column))
/* Use the new line. Otherwise the old one. */
match[inner] = line;
continue;
}
if (cur_match < max_match)
{
if (cur_match == act_match)
{
/* Enlarge the array for the results. */
act_match += 10;
Dwarf_Line **newp = realloc (match,
act_match
* sizeof (Dwarf_Line *));
if (newp == NULL)
{
free (match);
__libdw_seterrno (DWARF_E_NOMEM);
return -1;
}
match = newp;
}
match[cur_match++] = line;
}
}
/* If we managed to find as many matches as the user requested
already, there is no need to go on to the next CU. */
if (cur_match == max_match)
break;
off = noff;
}
if (cur_match > 0)
{
assert (*nsrcs == 0 || *srcsp == match);
*nsrcs = cur_match;
*srcsp = match;
return 0;
}
__libdw_seterrno (DWARF_E_NO_MATCH);
return -1;
}
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