1 /* Get function information. 2 Copyright (C) 2005, 2013, 2015 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper@redhat.com>, 2005. 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 struct visitor_info 39 { 40 /* The user callback of dwarf_getfuncs. */ 41 int (*callback) (Dwarf_Die *, void *); 42 43 /* The user arg value to dwarf_getfuncs. */ 44 void *arg; 45 46 /* Addr of the DIE offset where to (re)start the search. Zero for all. */ 47 void *start_addr; 48 49 /* Last subprogram DIE addr seen. */ 50 void *last_addr; 51 52 /* The CU only contains C functions. Allows pruning of most subtrees. */ 53 bool c_cu; 54 }; 55 56 static int 57 tree_visitor (unsigned int depth __attribute__ ((unused)), 58 struct Dwarf_Die_Chain *chain, void *arg) 59 { 60 struct visitor_info *const v = arg; 61 Dwarf_Die *die = &chain->die; 62 void *start_addr = v->start_addr; 63 void *die_addr = die->addr; 64 65 /* Pure C CUs can only contain defining subprogram DIEs as direct 66 children of the CU DIE or as nested function inside a normal C 67 code constructs. */ 68 int tag = INTUSE(dwarf_tag) (die); 69 if (v->c_cu 70 && tag != DW_TAG_subprogram 71 && tag != DW_TAG_lexical_block 72 && tag != DW_TAG_inlined_subroutine) 73 { 74 chain->prune = true; 75 return DWARF_CB_OK; 76 } 77 78 /* Skip all DIEs till we found the (re)start addr. */ 79 if (start_addr != NULL) 80 { 81 if (die_addr == start_addr) 82 v->start_addr = NULL; 83 return DWARF_CB_OK; 84 } 85 86 /* If this isn't a (defining) subprogram entity, skip DIE. */ 87 if (tag != DW_TAG_subprogram 88 || INTUSE(dwarf_hasattr) (die, DW_AT_declaration)) 89 return DWARF_CB_OK; 90 91 v->last_addr = die_addr; 92 return (*v->callback) (die, v->arg); 93 } 94 95 ptrdiff_t 96 dwarf_getfuncs (Dwarf_Die *cudie, int (*callback) (Dwarf_Die *, void *), 97 void *arg, ptrdiff_t offset) 98 { 99 if (unlikely (cudie == NULL 100 || INTUSE(dwarf_tag) (cudie) != DW_TAG_compile_unit)) 101 return -1; 102 103 int lang = INTUSE(dwarf_srclang) (cudie); 104 bool c_cu = (lang == DW_LANG_C89 105 || lang == DW_LANG_C 106 || lang == DW_LANG_C99 107 || lang == DW_LANG_C11); 108 109 struct visitor_info v = { callback, arg, (void *) offset, NULL, c_cu }; 110 struct Dwarf_Die_Chain chain = { .die = CUDIE (cudie->cu), 111 .parent = NULL }; 112 int res = __libdw_visit_scopes (0, &chain, NULL, &tree_visitor, NULL, &v); 113 114 if (res == DWARF_CB_ABORT) 115 return (ptrdiff_t) v.last_addr; 116 else 117 return res; 118 } 119