| /* Return die at given offset. |
| Copyright (C) 2000, 2002 Red Hat, Inc. |
| Written by Ulrich Drepper <drepper@redhat.com>, 2000. |
| |
| This program is Open Source software; you can redistribute it and/or |
| modify it under the terms of the Open Software License version 1.0 as |
| published by the Open Source Initiative. |
| |
| You should have received a copy of the Open Software License along |
| with this program; if not, you may obtain a copy of the Open Software |
| License version 1.0 from http://www.opensource.org/licenses/osl.php or |
| by writing the Open Source Initiative c/o Lawrence Rosen, Esq., |
| 3001 King Ranch Road, Ukiah, CA 95482. */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include <dwarf.h> |
| #include <stdlib.h> |
| |
| #include <libdwarfP.h> |
| |
| |
| /* XXX This function will have to be optimized. The search is too linear |
| to be performed too often -> O(n²). */ |
| static Dwarf_CU_Info |
| find_cu (Dwarf_Debug dbg, Dwarf_Off offset, Dwarf_Error *error) |
| { |
| Dwarf_CU_Info cu; |
| Dwarf_Word cu_offset; |
| |
| /* Search in the CUs already known. */ |
| for (cu = dbg->cu_list; cu != NULL; cu = cu->next) |
| if (cu->offset <= offset |
| && cu->offset + 2 * cu->offset_size - 4 + cu->length > offset) |
| return cu; |
| |
| /* The CU is not yet loaded. Do this now. */ |
| if (dbg->cu_list_tail == NULL) |
| cu_offset = 0; |
| else |
| cu_offset = (dbg->cu_list_tail->offset |
| + 2 * dbg->cu_list_tail->offset_size - 4 |
| + dbg->cu_list_tail->length); |
| |
| while (1) |
| { |
| /* Get next CU and add it to the end of the list. */ |
| if (__libdwarf_get_cu_at_offset (dbg, cu_offset, &cu, error) |
| != DW_DLV_OK) |
| return NULL; |
| |
| /* Offset of next CU. */ |
| cu_offset += 2 * cu->offset_size - 4 + cu->length; |
| |
| /* If this the CU we are looking for? */ |
| if (offset < cu_offset) |
| return cu; |
| } |
| } |
| |
| |
| int |
| dwarf_offdie (dbg, offset, return_die, error) |
| Dwarf_Debug dbg; |
| Dwarf_Off offset; |
| Dwarf_Die *return_die; |
| Dwarf_Error *error; |
| { |
| Dwarf_CU_Info cu; |
| Dwarf_Die new_die; |
| Dwarf_Small *die_addr; |
| Dwarf_Word u128; |
| |
| if (offset >= dbg->sections[IDX_debug_info].size) |
| { |
| /* Completely out of bounds. */ |
| __libdwarf_error (dbg, error, DW_E_INVALID_OFFSET); |
| return DW_DLV_ERROR; |
| } |
| |
| /* Find the compile unit this address belongs to. */ |
| cu = find_cu (dbg, offset, error); |
| if (cu == NULL) |
| return DW_DLV_ERROR; |
| |
| /* Creata a new die. */ |
| new_die = (Dwarf_Die) malloc (sizeof (struct Dwarf_Die_s)); |
| if (new_die == NULL) |
| { |
| __libdwarf_error (dbg, error, DW_E_NOMEM); |
| return DW_DLV_ERROR; |
| } |
| |
| #ifdef DWARF_DEBUG |
| new_die->memtag = DW_DLA_DIE; |
| #endif |
| |
| /* Remember the address. */ |
| die_addr = (Dwarf_Small *) dbg->sections[IDX_debug_info].addr + offset; |
| new_die->addr = die_addr; |
| |
| /* And the compile unit. */ |
| new_die->cu = cu; |
| |
| /* 7.5.2 Debugging Information Entry |
| |
| Each debugging information entry begins with an unsigned LEB128 |
| number containing the abbreviation code for the entry. */ |
| get_uleb128 (u128, die_addr); |
| |
| /* Find the abbreviation. */ |
| new_die->abbrev = __libdwarf_get_abbrev (dbg, cu, u128, error); |
| if (new_die->abbrev == NULL) |
| { |
| free (new_die); |
| return DW_DLV_ERROR; |
| } |
| |
| *return_die = new_die; |
| return DW_DLV_OK; |
| } |