| Brian Silverman | 8649792 | 2018-02-10 19:28:39 -0500 | [diff] [blame^] | 1 | /* Return string associated with given attribute. |
| 2 | Copyright (C) 2003-2010, 2013, 2018 Red Hat, Inc. |
| 3 | This file is part of elfutils. |
| 4 | Written by Ulrich Drepper <drepper@redhat.com>, 2003. |
| 5 | |
| 6 | This file is free software; you can redistribute it and/or modify |
| 7 | it under the terms of either |
| 8 | |
| 9 | * the GNU Lesser General Public License as published by the Free |
| 10 | Software Foundation; either version 3 of the License, or (at |
| 11 | your option) any later version |
| 12 | |
| 13 | or |
| 14 | |
| 15 | * the GNU General Public License as published by the Free |
| 16 | Software Foundation; either version 2 of the License, or (at |
| 17 | your option) any later version |
| 18 | |
| 19 | or both in parallel, as here. |
| 20 | |
| 21 | elfutils is distributed in the hope that it will be useful, but |
| 22 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 24 | General Public License for more details. |
| 25 | |
| 26 | You should have received copies of the GNU General Public License and |
| 27 | the GNU Lesser General Public License along with this program. If |
| 28 | not, see <http://www.gnu.org/licenses/>. */ |
| 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | # include <config.h> |
| 32 | #endif |
| 33 | |
| 34 | #include <dwarf.h> |
| 35 | #include "libdwP.h" |
| 36 | |
| 37 | |
| 38 | const char * |
| 39 | dwarf_formstring (Dwarf_Attribute *attrp) |
| 40 | { |
| 41 | /* Ignore earlier errors. */ |
| 42 | if (attrp == NULL) |
| 43 | return NULL; |
| 44 | |
| 45 | /* We found it. Now determine where the string is stored. */ |
| 46 | if (attrp->form == DW_FORM_string) |
| 47 | /* A simple inlined string. */ |
| 48 | return (const char *) attrp->valp; |
| 49 | |
| 50 | Dwarf *dbg = attrp->cu->dbg; |
| 51 | Dwarf *dbg_ret = (attrp->form == DW_FORM_GNU_strp_alt |
| 52 | ? INTUSE(dwarf_getalt) (dbg) : dbg); |
| 53 | |
| 54 | if (unlikely (dbg_ret == NULL)) |
| 55 | { |
| 56 | __libdw_seterrno (DWARF_E_NO_ALT_DEBUGLINK); |
| 57 | return NULL; |
| 58 | } |
| 59 | |
| 60 | |
| 61 | if (unlikely (attrp->form != DW_FORM_strp |
| 62 | && attrp->form != DW_FORM_GNU_strp_alt) |
| 63 | || dbg_ret->sectiondata[IDX_debug_str] == NULL) |
| 64 | { |
| 65 | __libdw_seterrno (DWARF_E_NO_STRING); |
| 66 | return NULL; |
| 67 | } |
| 68 | |
| 69 | uint64_t off; |
| 70 | if (__libdw_read_offset (dbg, dbg_ret, cu_sec_idx (attrp->cu), attrp->valp, |
| 71 | attrp->cu->offset_size, &off, IDX_debug_str, 1)) |
| 72 | return NULL; |
| 73 | |
| 74 | return (const char *) dbg_ret->sectiondata[IDX_debug_str]->d_buf + off; |
| 75 | } |
| 76 | INTDEF(dwarf_formstring) |