| /* Find matching source locations in a module. |
| Copyright (C) 2005 Red Hat, Inc. |
| |
| 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. */ |
| |
| #include "libdwflP.h" |
| #include "../libdw/libdwP.h" |
| |
| |
| int |
| dwfl_module_getsrc_file (Dwfl_Module *mod, |
| const char *fname, int lineno, int column, |
| Dwfl_Line ***srcsp, size_t *nsrcs) |
| { |
| if (mod == 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; |
| Dwfl_Line **match = *nsrcs == 0 ? NULL : *srcsp; |
| |
| struct dwfl_cu *cu = NULL; |
| Dwfl_Error error; |
| while ((error = __libdwfl_nextcu (mod, cu, &cu)) == DWFL_E_NOERROR |
| && cu != NULL |
| && (error = __libdwfl_cu_getsrclines (cu)) == DWFL_E_NOERROR) |
| { |
| inline const char *dwarf_line_file (const Dwarf_Line *line) |
| { |
| return line->files->info[line->file].name; |
| } |
| inline Dwarf_Line *dwfl_line (const Dwfl_Line *line) |
| { |
| return &dwfl_linecu (line)->die.cu->lines->info[line->idx]; |
| } |
| inline const char *dwfl_line_file (const Dwfl_Line *line) |
| { |
| return dwarf_line_file (dwfl_line (line)); |
| } |
| |
| /* 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. */ |
| const char *lastfile = NULL; |
| bool lastmatch = false; |
| for (size_t cnt = 0; cnt < cu->die.cu->lines->nlines; ++cnt) |
| { |
| Dwarf_Line *line = &cu->die.cu->lines->info[cnt]; |
| |
| if (unlikely (line->file >= line->files->nfiles)) |
| { |
| __libdwfl_seterrno (DWFL_E (LIBDW, DWARF_E_INVALID_DWARF)); |
| return -1; |
| } |
| else |
| { |
| const char *file = dwarf_line_file (line); |
| if (file != lastfile) |
| { |
| /* Match the name with the name the user provided. */ |
| lastfile = file; |
| lastmatch = !strcmp (is_basename ? basename (file) : file, |
| fname); |
| } |
| } |
| 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 (dwfl_line_file (match[inner]) == dwarf_line_file (line)) |
| break; |
| if (inner < cur_match |
| && (dwfl_line (match[inner])->line != line->line |
| || dwfl_line (match[inner])->line != lineno |
| || (column != 0 |
| && (dwfl_line (match[inner])->column != line->column |
| || dwfl_line (match[inner])->column != column)))) |
| { |
| /* We know about this file already. If this is a better |
| match for the line number, use it. */ |
| if (dwfl_line (match[inner])->line >= line->line |
| && (dwfl_line (match[inner])->line != line->line |
| || dwfl_line (match[inner])->column >= line->column)) |
| /* Use the new line. Otherwise the old one. */ |
| match[inner] = &cu->lines->idx[cnt]; |
| continue; |
| } |
| |
| if (cur_match < max_match) |
| { |
| if (cur_match == act_match) |
| { |
| /* Enlarge the array for the results. */ |
| act_match += 10; |
| Dwfl_Line **newp = realloc (match, |
| act_match |
| * sizeof (Dwfl_Line *)); |
| if (newp == NULL) |
| { |
| free (match); |
| __libdwfl_seterrno (DWFL_E_NOMEM); |
| return -1; |
| } |
| match = newp; |
| } |
| |
| match[cur_match++] = &cu->lines->idx[cnt]; |
| } |
| } |
| } |
| |
| if (cur_match > 0) |
| { |
| assert (*nsrcs == 0 || *srcsp == match); |
| |
| *nsrcs = cur_match; |
| *srcsp = match; |
| |
| return 0; |
| } |
| |
| __libdwfl_seterrno (DWFL_E_NO_MATCH); |
| return -1; |
| } |