| /* Find source location for PC address in module. |
| Copyright (C) 2005, 2008 Red Hat, Inc. |
| This file is part of elfutils. |
| |
| This file is free software; you can redistribute it and/or modify |
| it under the terms of either |
| |
| * the GNU Lesser General Public License as published by the Free |
| Software Foundation; either version 3 of the License, or (at |
| your option) any later version |
| |
| or |
| |
| * the GNU General Public License as published by the Free |
| Software Foundation; either version 2 of the License, or (at |
| your option) any later version |
| |
| or both in parallel, as here. |
| |
| 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 copies of the GNU General Public License and |
| the GNU Lesser General Public License along with this program. If |
| not, see <http://www.gnu.org/licenses/>. */ |
| |
| #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) |