1 /* Maintenance of module list in libdwfl. 2 Copyright (C) 2005, 2006, 2007, 2008, 2014 Red Hat, Inc. 3 This file is part of elfutils. 4 5 This file is free software; you can redistribute it and/or modify 6 it under the terms of either 7 8 * the GNU Lesser General Public License as published by the Free 9 Software Foundation; either version 3 of the License, or (at 10 your option) any later version 11 12 or 13 14 * the GNU General Public License as published by the Free 15 Software Foundation; either version 2 of the License, or (at 16 your option) any later version 17 18 or both in parallel, as here. 19 20 elfutils is distributed in the hope that it will be useful, but 21 WITHOUT ANY WARRANTY; without even the implied warranty of 22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 23 General Public License for more details. 24 25 You should have received copies of the GNU General Public License and 26 the GNU Lesser General Public License along with this program. If 27 not, see <http://www.gnu.org/licenses/>. */ 28 29 #include "libdwflP.h" 30 #include <search.h> 31 #include <unistd.h> 32 33 static void 34 free_cu (struct dwfl_cu *cu) 35 { 36 if (cu->lines != NULL) 37 free (cu->lines); 38 free (cu); 39 } 40 41 static void 42 nofree (void *arg __attribute__ ((unused))) 43 { 44 } 45 46 static void 47 free_file (struct dwfl_file *file) 48 { 49 free (file->name); 50 51 /* Close the fd only on the last reference. */ 52 if (file->elf != NULL && elf_end (file->elf) == 0 && file->fd != -1) 53 close (file->fd); 54 } 55 56 void 57 internal_function 58 __libdwfl_module_free (Dwfl_Module *mod) 59 { 60 if (mod->lazy_cu_root != NULL) 61 tdestroy (mod->lazy_cu_root, nofree); 62 63 if (mod->aranges != NULL) 64 free (mod->aranges); 65 66 if (mod->cu != NULL) 67 { 68 for (size_t i = 0; i < mod->ncu; ++i) 69 free_cu (mod->cu[i]); 70 free (mod->cu); 71 } 72 73 if (mod->dw != NULL) 74 { 75 INTUSE(dwarf_end) (mod->dw); 76 if (mod->alt != NULL) 77 { 78 INTUSE(dwarf_end) (mod->alt); 79 if (mod->alt_elf != NULL) 80 elf_end (mod->alt_elf); 81 if (mod->alt_fd != -1) 82 close (mod->alt_fd); 83 } 84 } 85 86 if (mod->ebl != NULL) 87 ebl_closebackend (mod->ebl); 88 89 if (mod->debug.elf != mod->main.elf) 90 free_file (&mod->debug); 91 free_file (&mod->main); 92 free_file (&mod->aux_sym); 93 94 if (mod->build_id_bits != NULL) 95 free (mod->build_id_bits); 96 97 if (mod->reloc_info != NULL) 98 free (mod->reloc_info); 99 100 if (mod->eh_cfi != NULL) 101 dwarf_cfi_end (mod->eh_cfi); 102 103 free (mod->name); 104 free (mod); 105 } 106 107 void 108 dwfl_report_begin_add (Dwfl *dwfl __attribute__ ((unused))) 109 { 110 /* The lookup table will be cleared on demand, there is nothing we need 111 to do here. */ 112 } 113 INTDEF (dwfl_report_begin_add) 114 115 void 116 dwfl_report_begin (Dwfl *dwfl) 117 { 118 /* Clear the segment lookup table. */ 119 dwfl->lookup_elts = 0; 120 121 for (Dwfl_Module *m = dwfl->modulelist; m != NULL; m = m->next) 122 m->gc = true; 123 124 dwfl->offline_next_address = OFFLINE_REDZONE; 125 } 126 INTDEF (dwfl_report_begin) 127 128 /* Report that a module called NAME spans addresses [START, END). 129 Returns the module handle, either existing or newly allocated, 130 or returns a null pointer for an allocation error. */ 131 Dwfl_Module * 132 dwfl_report_module (Dwfl *dwfl, const char *name, 133 GElf_Addr start, GElf_Addr end) 134 { 135 Dwfl_Module **tailp = &dwfl->modulelist, **prevp = tailp; 136 137 inline Dwfl_Module *use (Dwfl_Module *mod) 138 { 139 mod->next = *tailp; 140 *tailp = mod; 141 142 if (unlikely (dwfl->lookup_module != NULL)) 143 { 144 free (dwfl->lookup_module); 145 dwfl->lookup_module = NULL; 146 } 147 148 return mod; 149 } 150 151 for (Dwfl_Module *m = *prevp; m != NULL; m = *(prevp = &m->next)) 152 { 153 if (m->low_addr == start && m->high_addr == end 154 && !strcmp (m->name, name)) 155 { 156 /* This module is still here. Move it to the place in the list 157 after the last module already reported. */ 158 *prevp = m->next; 159 m->gc = false; 160 return use (m); 161 } 162 163 if (! m->gc) 164 tailp = &m->next; 165 } 166 167 Dwfl_Module *mod = calloc (1, sizeof *mod); 168 if (mod == NULL) 169 goto nomem; 170 171 mod->name = strdup (name); 172 if (mod->name == NULL) 173 { 174 free (mod); 175 nomem: 176 __libdwfl_seterrno (DWFL_E_NOMEM); 177 return NULL; 178 } 179 180 mod->low_addr = start; 181 mod->high_addr = end; 182 mod->dwfl = dwfl; 183 184 return use (mod); 185 } 186 INTDEF (dwfl_report_module) 187 188 189 /* Finish reporting the current set of modules to the library. 190 If REMOVED is not null, it's called for each module that 191 existed before but was not included in the current report. 192 Returns a nonzero return value from the callback. 193 DWFL cannot be used until this function has returned zero. */ 194 int 195 dwfl_report_end (Dwfl *dwfl, 196 int (*removed) (Dwfl_Module *, void *, 197 const char *, Dwarf_Addr, 198 void *arg), 199 void *arg) 200 { 201 Dwfl_Module **tailp = &dwfl->modulelist; 202 while (*tailp != NULL) 203 { 204 Dwfl_Module *m = *tailp; 205 if (m->gc && removed != NULL) 206 { 207 int result = (*removed) (MODCB_ARGS (m), arg); 208 if (result != 0) 209 return result; 210 } 211 if (m->gc) 212 { 213 *tailp = m->next; 214 __libdwfl_module_free (m); 215 } 216 else 217 tailp = &m->next; 218 } 219 220 return 0; 221 } 222 INTDEF (dwfl_report_end) 223
