diff options
Diffstat (limited to 'libdwfl/dwfl_module_getsrc.c')
| -rw-r--r-- | libdwfl/dwfl_module_getsrc.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/libdwfl/dwfl_module_getsrc.c b/libdwfl/dwfl_module_getsrc.c new file mode 100644 index 0000000..be03055 --- /dev/null +++ b/libdwfl/dwfl_module_getsrc.c @@ -0,0 +1,99 @@ +/* Find source location for PC address in module. + Copyright (C) 2005, 2008 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 + <http://www.openinventionnetwork.com>. */ + +#include "libdwflP.h" +#include "../libdw/libdwP.h" + +Dwfl_Line * +dwfl_module_getsrc (Dwfl_Module *mod, Dwarf_Addr addr) +{ + Dwarf_Addr bias; + if (INTUSE(dwfl_module_getdwarf) (mod, &bias) == NULL) + return NULL; + + struct dwfl_cu *cu; + Dwfl_Error error = __libdwfl_addrcu (mod, addr, &cu); + if (likely (error == DWFL_E_NOERROR)) + error = __libdwfl_cu_getsrclines (cu); + if (likely (error == DWFL_E_NOERROR)) + { + /* Now we look at the module-relative address. */ + addr -= bias; + + /* The lines are sorted by address, so we can use binary search. */ + size_t l = 0, u = cu->die.cu->lines->nlines; + while (l < u) + { + size_t idx = (l + u) / 2; + if (addr < cu->die.cu->lines->info[idx].addr) + u = idx; + else if (addr > cu->die.cu->lines->info[idx].addr) + l = idx + 1; + else + return &cu->lines->idx[idx]; + } + + if (cu->die.cu->lines->nlines > 0) + assert (cu->die.cu->lines->info + [cu->die.cu->lines->nlines - 1].end_sequence); + + /* If none were equal, the closest one below is what we want. + We never want the last one, because it's the end-sequence + marker with an address at the high bound of the CU's code. */ + if (u > 0 && u < cu->die.cu->lines->nlines + && addr > cu->die.cu->lines->info[u - 1].addr) + return &cu->lines->idx[u - 1]; + + error = DWFL_E_ADDR_OUTOFRANGE; + } + + __libdwfl_seterrno (error); + return NULL; +} +INTDEF (dwfl_module_getsrc) |