1 /* Maintenance of module list in libdwfl. 2 Copyright (C) 2005, 2006, 2007, 2008 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 5 Red Hat elfutils is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by the 7 Free Software Foundation; version 2 of the License. 8 9 Red Hat elfutils is distributed in the hope that it will be useful, but 10 WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 General Public License for more details. 13 14 You should have received a copy of the GNU General Public License along 15 with Red Hat elfutils; if not, write to the Free Software Foundation, 16 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 17 18 In addition, as a special exception, Red Hat, Inc. gives You the 19 additional right to link the code of Red Hat elfutils with code licensed 20 under any Open Source Initiative certified open source license 21 (http://www.opensource.org/licenses/index.php) which requires the 22 distribution of source code with any binary distribution and to 23 distribute linked combinations of the two. Non-GPL Code permitted under 24 this exception must only link to the code of Red Hat elfutils through 25 those well defined interfaces identified in the file named EXCEPTION 26 found in the source code files (the "Approved Interfaces"). The files 27 of Non-GPL Code may instantiate templates or use macros or inline 28 functions from the Approved Interfaces without causing the resulting 29 work to be covered by the GNU General Public License. Only Red Hat, 30 Inc. may make changes or additions to the list of Approved Interfaces. 31 Red Hat's grant of this exception is conditioned upon your not adding 32 any new exceptions. If you wish to add a new Approved Interface or 33 exception, please contact Red Hat. You must obey the GNU General Public 34 License in all respects for all of the Red Hat elfutils code and other 35 code used in conjunction with Red Hat elfutils except the Non-GPL Code 36 covered by this exception. If you modify this file, you may extend this 37 exception to your version of the file, but you are not obligated to do 38 so. If you do not wish to provide this exception without modification, 39 you must delete this exception statement from your version and license 40 this file solely under the GPL without exception. 41 42 Red Hat elfutils is an included package of the Open Invention Network. 43 An included package of the Open Invention Network is a package for which 44 Open Invention Network licensees cross-license their patents. No patent 45 license is granted, either expressly or impliedly, by designation as an 46 included package. Should you wish to participate in the Open Invention 47 Network licensing program, please visit www.openinventionnetwork.com 48 <http://www.openinventionnetwork.com>. */ 49 50 #include "libdwflP.h" 51 #include <search.h> 52 #include <unistd.h> 53 54 static void 55 free_cu (struct dwfl_cu *cu) 56 { 57 if (cu->lines != NULL) 58 free (cu->lines); 59 free (cu); 60 } 61 62 static void 63 nofree (void *arg __attribute__ ((unused))) 64 { 65 } 66 67 static void 68 free_file (struct dwfl_file *file) 69 { 70 free (file->name); 71 72 /* Close the fd only on the last reference. */ 73 if (file->elf != NULL && elf_end (file->elf) == 0 && file->fd != -1) 74 close (file->fd); 75 } 76 77 void 78 internal_function 79 __libdwfl_module_free (Dwfl_Module *mod) 80 { 81 if (mod->lazy_cu_root != NULL) 82 tdestroy (mod->lazy_cu_root, nofree); 83 84 if (mod->aranges != NULL) 85 free (mod->aranges); 86 87 if (mod->cu != NULL) 88 { 89 for (size_t i = 0; i < mod->ncu; ++i) 90 free_cu (mod->cu[i]); 91 free (mod->cu); 92 } 93 94 if (mod->dw != NULL) 95 INTUSE(dwarf_end) (mod->dw); 96 97 if (mod->ebl != NULL) 98 ebl_closebackend (mod->ebl); 99 100 if (mod->debug.elf != mod->main.elf) 101 free_file (&mod->debug); 102 free_file (&mod->main); 103 104 if (mod->build_id_bits != NULL) 105 free (mod->build_id_bits); 106 107 free (mod->name); 108 free (mod); 109 } 110 111 void 112 dwfl_report_begin_add (Dwfl *dwfl __attribute__ ((unused))) 113 { 114 /* The lookup table will be cleared on demand, there is nothing we need 115 to do here. */ 116 } 117 INTDEF (dwfl_report_begin_add) 118 119 void 120 dwfl_report_begin (Dwfl *dwfl) 121 { 122 /* Clear the segment lookup table. */ 123 dwfl->lookup_elts = 0; 124 125 for (Dwfl_Module *m = dwfl->modulelist; m != NULL; m = m->next) 126 m->gc = true; 127 128 dwfl->offline_next_address = OFFLINE_REDZONE; 129 } 130 INTDEF (dwfl_report_begin) 131 132 /* Report that a module called NAME spans addresses [START, END). 133 Returns the module handle, either existing or newly allocated, 134 or returns a null pointer for an allocation error. */ 135 Dwfl_Module * 136 dwfl_report_module (Dwfl *dwfl, const char *name, 137 GElf_Addr start, GElf_Addr end) 138 { 139 Dwfl_Module **tailp = &dwfl->modulelist, **prevp = tailp; 140 141 inline Dwfl_Module *use (Dwfl_Module *mod) 142 { 143 mod->next = *tailp; 144 *tailp = mod; 145 146 if (unlikely (dwfl->lookup_module != NULL)) 147 { 148 free (dwfl->lookup_module); 149 dwfl->lookup_module = NULL; 150 } 151 152 return mod; 153 } 154 155 for (Dwfl_Module *m = *prevp; m != NULL; m = *(prevp = &m->next)) 156 { 157 if (m->low_addr == start && m->high_addr == end 158 && !strcmp (m->name, name)) 159 { 160 /* This module is still here. Move it to the place in the list 161 after the last module already reported. */ 162 *prevp = m->next; 163 m->gc = false; 164 return use (m); 165 } 166 167 if (! m->gc) 168 tailp = &m->next; 169 } 170 171 Dwfl_Module *mod = calloc (1, sizeof *mod); 172 if (mod == NULL) 173 goto nomem; 174 175 mod->name = strdup (name); 176 if (mod->name == NULL) 177 { 178 free (mod); 179 nomem: 180 __libdwfl_seterrno (DWFL_E_NOMEM); 181 return NULL; 182 } 183 184 mod->low_addr = start; 185 mod->high_addr = end; 186 mod->dwfl = dwfl; 187 188 return use (mod); 189 } 190 INTDEF (dwfl_report_module) 191 192 193 /* Finish reporting the current set of modules to the library. 194 If REMOVED is not null, it's called for each module that 195 existed before but was not included in the current report. 196 Returns a nonzero return value from the callback. 197 DWFL cannot be used until this function has returned zero. */ 198 int 199 dwfl_report_end (Dwfl *dwfl, 200 int (*removed) (Dwfl_Module *, void *, 201 const char *, Dwarf_Addr, 202 void *arg), 203 void *arg) 204 { 205 Dwfl_Module **tailp = &dwfl->modulelist; 206 while (*tailp != NULL) 207 { 208 Dwfl_Module *m = *tailp; 209 if (m->gc && removed != NULL) 210 { 211 int result = (*removed) (MODCB_ARGS (m), arg); 212 if (result != 0) 213 return result; 214 } 215 if (m->gc) 216 { 217 *tailp = m->next; 218 __libdwfl_module_free (m); 219 } 220 else 221 tailp = &m->next; 222 } 223 224 return 0; 225 } 226 INTDEF (dwfl_report_end) 227
