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86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
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/* Find source location for PC address in module.
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Copyright (C) 2005, 2008, 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 "libdwflP.h"
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#include "../libdw/libdwP.h"
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Dwfl_Line *
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dwfl_module_getsrc (Dwfl_Module *mod, Dwarf_Addr addr)
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{
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Dwarf_Addr bias;
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if (INTUSE(dwfl_module_getdwarf) (mod, &bias) == NULL)
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return NULL;
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struct dwfl_cu *cu;
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Dwfl_Error error = __libdwfl_addrcu (mod, addr, &cu);
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if (likely (error == DWFL_E_NOERROR))
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error = __libdwfl_cu_getsrclines (cu);
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if (likely (error == DWFL_E_NOERROR))
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{
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Dwarf_Lines *lines = cu->die.cu->lines;
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size_t nlines = lines->nlines;
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if (nlines > 0)
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{
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/* This is guaranteed for us by libdw read_srclines. */
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assert(lines->info[nlines - 1].end_sequence);
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/* Now we look at the module-relative address. */
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addr -= bias;
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/* The lines are sorted by address, so we can use binary search. */
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size_t l = 0, u = nlines - 1;
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while (l < u)
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{
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size_t idx = u - (u - l) / 2;
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Dwarf_Line *line = &lines->info[idx];
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if (addr < line->addr)
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u = idx - 1;
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else
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l = idx;
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}
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/* The last line which is less than or equal to addr is what
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we want, unless it is the end_sequence which is after the
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current line sequence. */
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Dwarf_Line *line = &lines->info[l];
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if (! line->end_sequence && line->addr <= addr)
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return &cu->lines->idx[l];
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}
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error = DWFL_E_ADDR_OUTOFRANGE;
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}
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__libdwfl_seterrno (error);
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return NULL;
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}
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INTDEF (dwfl_module_getsrc)
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