Blame libdw/dwarf_macro_getsrcfiles.c

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/* Find line information for a given macro.
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   Copyright (C) 2014 Red Hat, Inc.
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   This file is part of elfutils.
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   This file is free software; you can redistribute it and/or modify
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   it under the terms of either
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     * the GNU Lesser General Public License as published by the Free
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       Software Foundation; either version 3 of the License, or (at
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       your option) any later version
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   or
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     * the GNU General Public License as published by the Free
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       Software Foundation; either version 2 of the License, or (at
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       your option) any later version
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   or both in parallel, as here.
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   elfutils 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.  See the GNU
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   General Public License for more details.
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   You should have received copies of the GNU General Public License and
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   the GNU Lesser General Public License along with this program.  If
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   not, see <http://www.gnu.org/licenses/>.  */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "libdwP.h"
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int
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dwarf_macro_getsrcfiles (Dwarf *dbg, Dwarf_Macro *macro,
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			 Dwarf_Files **files, size_t *nfiles)
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{
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  /* macro is declared NN */
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  Dwarf_Macro_Op_Table *const table = macro->table;
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  if (table->files == NULL)
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    {
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      Dwarf_Off line_offset = table->line_offset;
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      if (line_offset == (Dwarf_Off) -1)
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	{
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	  *files = NULL;
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	  *nfiles = 0;
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	  return 0;
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	}
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      /* If TABLE->comp_dir is NULL that could mean any of the
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	 following:
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	 - The macro unit is not bound to a CU.  It's an auxiliary
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           unit used purely for import from other units.  In that case
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           there's actually no COMP_DIR value that we could use.
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	 - The macro unit is bound to a CU, but there's no
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           DW_AT_comp_dir attribute at the CU DIE.
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	 - The macro unit is bound to a CU, but we don't know that,
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           likely because its iteration was requested through
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           dwarf_getmacros_off interface.  This might be legitimate if
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           one macro unit imports another CU's macro unit, but that is
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           unlikely to happen in practice.  Most probably this is not
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           legitimate use of the interfaces.
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	 So when the interfaces are used correctly, COMP_DIR value is
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	 always right.  That means that we can cache the parsed
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	 .debug_line unit without fear that later on someone requests
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	 the same unit through dwarf_getsrcfiles, and the file names
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	 will be broken.  */
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      if (__libdw_getsrclines (dbg, line_offset, table->comp_dir,
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			       table->is_64bit ? 8 : 4,
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			       NULL, &table->files) < 0)
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	table->files = (void *) -1;
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    }
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  if (table->files == (void *) -1)
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    return -1;
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  *files = table->files;
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  *nfiles = table->files->nfiles;
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  return 0;
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}