diff options
Diffstat (limited to 'libdwfl/dwfl_module_getsrc_file.c')
| -rw-r--r-- | libdwfl/dwfl_module_getsrc_file.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/libdwfl/dwfl_module_getsrc_file.c b/libdwfl/dwfl_module_getsrc_file.c new file mode 100644 index 00000000..81f57ed6 --- /dev/null +++ b/libdwfl/dwfl_module_getsrc_file.c @@ -0,0 +1,144 @@ +/* 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; +} |