/* Find a named variable or parameter within given scopes. Copyright (C) 2005 Red Hat, Inc. This file is part of Red Hat elfutils. Red Hat elfutils is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. Red Hat elfutils is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Red Hat elfutils; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. In addition, as a special exception, Red Hat, Inc. gives You the additional right to link the code of Red Hat elfutils with code licensed under any Open Source Initiative certified open source license (http://www.opensource.org/licenses/index.php) which requires the distribution of source code with any binary distribution and to distribute linked combinations of the two. Non-GPL Code permitted under this exception must only link to the code of Red Hat elfutils through those well defined interfaces identified in the file named EXCEPTION found in the source code files (the "Approved Interfaces"). The files of Non-GPL Code may instantiate templates or use macros or inline functions from the Approved Interfaces without causing the resulting work to be covered by the GNU General Public License. Only Red Hat, Inc. may make changes or additions to the list of Approved Interfaces. Red Hat's grant of this exception is conditioned upon your not adding any new exceptions. If you wish to add a new Approved Interface or exception, please contact Red Hat. You must obey the GNU General Public License in all respects for all of the Red Hat elfutils code and other code used in conjunction with Red Hat elfutils except the Non-GPL Code covered by this exception. If you modify this file, you may extend this exception to your version of the file, but you are not obligated to do so. If you do not wish to provide this exception without modification, you must delete this exception statement from your version and license this file solely under the GPL without exception. Red Hat elfutils is an included package of the Open Invention Network. An included package of the Open Invention Network is a package for which Open Invention Network licensees cross-license their patents. No patent license is granted, either expressly or impliedly, by designation as an included package. Should you wish to participate in the Open Invention Network licensing program, please visit www.openinventionnetwork.com . */ #ifdef HAVE_CONFIG_H # include #endif #include #include #include "libdwP.h" #include /* Find the containing CU's files. */ static int getfiles (Dwarf_Die *die, Dwarf_Files **files) { return INTUSE(dwarf_getsrcfiles) (&CUDIE (die->cu), files, NULL); } /* Fetch an attribute that should have a constant integer form. */ static int getattr (Dwarf_Die *die, int search_name, Dwarf_Word *value) { Dwarf_Attribute attr_mem; return INTUSE(dwarf_formudata) (INTUSE(dwarf_attr) (die, search_name, &attr_mem), value); } /* Search SCOPES[0..NSCOPES-1] for a variable called NAME. Ignore the first SKIP_SHADOWS scopes that match the name. If MATCH_FILE is not null, accept only declaration in that source file; if MATCH_LINENO or MATCH_LINECOL are also nonzero, accept only declaration at that line and column. If successful, fill in *RESULT with the DIE of the variable found, and return N where SCOPES[N] is the scope defining the variable. Return -1 for errors or -2 for no matching variable found. */ int dwarf_getscopevar (Dwarf_Die *scopes, int nscopes, const char *name, int skip_shadows, const char *match_file, int match_lineno, int match_linecol, Dwarf_Die *result) { /* Match against the given file name. */ size_t match_file_len = match_file == NULL ? 0 : strlen (match_file); const char *lastfile = NULL; #ifdef __clang__ __block bool lastfile_matches = false; bool (^file_matches) (Dwarf_Files *, size_t) = ^bool (Dwarf_Files *files, size_t idx) #else bool lastfile_matches = false; inline bool file_matches (Dwarf_Files *files, size_t idx) #endif { if (idx >= files->nfiles) return false; const char *file = files->info[idx].name; if (file != lastfile) { size_t len = strlen (file); lastfile_matches = (len >= match_file_len && !memcmp (match_file, file, match_file_len) && (len == match_file_len || file[len - match_file_len - 1] == '/')); } return lastfile_matches; }; /* Start with the innermost scope and move out. */ for (int out = 0; out < nscopes; ++out) if (INTUSE(dwarf_haschildren) (&scopes[out])) { if (INTUSE(dwarf_child) (&scopes[out], result) != 0) return -1; do { switch (INTUSE(dwarf_tag) (result)) { case DW_TAG_variable: case DW_TAG_formal_parameter: break; default: continue; } /* Only get here for a variable or parameter. Check the name. */ Dwarf_Attribute attr_mem; const char *diename = INTUSE(dwarf_formstring) (INTUSE(dwarf_attr_integrate) (result, DW_AT_name, &attr_mem)); if (diename != NULL && !strcmp (name, diename)) { /* We have a matching name. */ if (skip_shadows > 0) { /* Punt this scope for the one it shadows. */ --skip_shadows; break; } if (match_file != NULL) { /* Check its decl_file. */ Dwarf_Word i; Dwarf_Files *files; if (getattr (result, DW_AT_decl_file, &i) != 0 || getfiles (&scopes[out], &files) != 0) break; if (!file_matches (files, i)) break; if (match_lineno > 0 && (getattr (result, DW_AT_decl_line, &i) != 0 || (int) i != match_lineno)) break; if (match_linecol > 0 && (getattr (result, DW_AT_decl_column, &i) != 0 || (int) i != match_linecol)) break; } /* We have a winner! */ return out; } } while (INTUSE(dwarf_siblingof) (result, result) == 0); } return -2; }