/* Copyright (C) 2000-2006 Silicon Graphics, Inc. All Rights Reserved. Portions Copyright (C) 2007-2010 David Anderson. All Rights Reserved. This program is free software; you can redistribute it and/or modify it under the terms of version 2.1 of the GNU Lesser General Public License as published by the Free Software Foundation. This program is distributed in the hope that it would be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Further, this software is distributed without any warranty that it is free of the rightful claim of any third person regarding infringement or the like. Any license provided herein, whether implied or otherwise, applies only to this software file. Patent licenses, if any, provided herein do not apply to combinations of this program with other software, or any other product whatsoever. You should have received a copy of the GNU Lesser General Public License along with this program; if not, write the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston MA 02110-1301, USA. Contact information: Silicon Graphics, Inc., 1500 Crittenden Lane, Mountain View, CA 94043, or: http://www.sgi.com For further information regarding this notice, see: http://oss.sgi.com/projects/GenInfo/NoticeExplan */ /* The address of the Free Software Foundation is Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. SGI has moved from the Crittenden Lane address. */ #include "config.h" #include "dwarf_incl.h" #ifdef HAVE_ELF_H #include #endif #include #include "dwarf_die_deliv.h" /* For a given Dwarf_Debug dbg, this function checks if a CU that includes the given offset has been read or not. If yes, it returns the Dwarf_CU_Context for the CU. Otherwise it returns NULL. Being an internal routine, it is assumed that a valid dbg is passed. **This is a sequential search. May be too slow. If debug_info and debug_abbrev not loaded, this will wind up returning NULL. So no need to load before calling this. */ static Dwarf_CU_Context _dwarf_find_CU_Context(Dwarf_Debug dbg, Dwarf_Off offset) { Dwarf_CU_Context cu_context = 0; if (offset >= dbg->de_info_last_offset) return (NULL); if (dbg->de_cu_context != NULL && dbg->de_cu_context->cc_next != NULL && dbg->de_cu_context->cc_next->cc_debug_info_offset == offset) { return (dbg->de_cu_context->cc_next); } if (dbg->de_cu_context != NULL && dbg->de_cu_context->cc_debug_info_offset <= offset) { for (cu_context = dbg->de_cu_context; cu_context != NULL; cu_context = cu_context->cc_next) { if (offset >= cu_context->cc_debug_info_offset && offset < cu_context->cc_debug_info_offset + cu_context->cc_length + cu_context->cc_length_size + cu_context->cc_extension_size) { return (cu_context); } } } for (cu_context = dbg->de_cu_context_list; cu_context != NULL; cu_context = cu_context->cc_next) { if (offset >= cu_context->cc_debug_info_offset && offset < cu_context->cc_debug_info_offset + cu_context->cc_length + cu_context->cc_length_size + cu_context->cc_extension_size) { return (cu_context); } } return (NULL); } /* This routine checks the dwarf_offdie() list of CU contexts for the right CU context. */ static Dwarf_CU_Context _dwarf_find_offdie_CU_Context(Dwarf_Debug dbg, Dwarf_Off offset) { Dwarf_CU_Context cu_context = 0; for (cu_context = dbg->de_offdie_cu_context; cu_context != NULL; cu_context = cu_context->cc_next) if (offset >= cu_context->cc_debug_info_offset && offset < cu_context->cc_debug_info_offset + cu_context->cc_length + cu_context->cc_length_size + cu_context->cc_extension_size) return (cu_context); return (NULL); } /* This function is used to create a CU Context for a compilation-unit that begins at offset in .debug_info. The CU Context is attached to the list of CU Contexts for this dbg. It is assumed that the CU at offset has not been read before, and so do not call this routine before making sure of this with _dwarf_find_CU_Context(). Returns NULL on error. As always, being an internal routine, assumes a good dbg. This function must always set a dwarf error code before returning NULL. Always. */ static Dwarf_CU_Context _dwarf_make_CU_Context(Dwarf_Debug dbg, Dwarf_Off offset, Dwarf_Error * error) { Dwarf_CU_Context cu_context = 0; Dwarf_Unsigned length = 0; Dwarf_Signed abbrev_offset = 0; Dwarf_Byte_Ptr cu_ptr = 0; int local_extension_size = 0; int local_length_size = 0; cu_context = (Dwarf_CU_Context) _dwarf_get_alloc(dbg, DW_DLA_CU_CONTEXT, 1); if (cu_context == NULL) { _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); return (NULL); } cu_context->cc_dbg = dbg; cu_ptr = (Dwarf_Byte_Ptr) (dbg->de_debug_info.dss_data + offset); /* READ_AREA_LENGTH updates cu_ptr for consumed bytes */ READ_AREA_LENGTH(dbg, length, Dwarf_Unsigned, cu_ptr, local_length_size, local_extension_size); cu_context->cc_length_size = local_length_size; cu_context->cc_extension_size = local_extension_size; cu_context->cc_length = (Dwarf_Word) length; READ_UNALIGNED(dbg, cu_context->cc_version_stamp, Dwarf_Half, cu_ptr, sizeof(Dwarf_Half)); cu_ptr += sizeof(Dwarf_Half); READ_UNALIGNED(dbg, abbrev_offset, Dwarf_Signed, cu_ptr, local_length_size); cu_ptr += local_length_size; cu_context->cc_abbrev_offset = (Dwarf_Sword) abbrev_offset; cu_context->cc_address_size = *(Dwarf_Small *) cu_ptr; if ((length < CU_VERSION_STAMP_SIZE + local_length_size + CU_ADDRESS_SIZE_SIZE) || (offset + length + local_length_size + local_extension_size > dbg->de_debug_info.dss_size)) { dwarf_dealloc(dbg, cu_context, DW_DLA_CU_CONTEXT); _dwarf_error(dbg, error, DW_DLE_CU_LENGTH_ERROR); return (NULL); } if (cu_context->cc_version_stamp != CURRENT_VERSION_STAMP && cu_context->cc_version_stamp != CURRENT_VERSION_STAMP3 && cu_context->cc_version_stamp != CURRENT_VERSION_STAMP4) { dwarf_dealloc(dbg, cu_context, DW_DLA_CU_CONTEXT); _dwarf_error(dbg, error, DW_DLE_VERSION_STAMP_ERROR); return (NULL); } if (abbrev_offset >= dbg->de_debug_abbrev.dss_size) { dwarf_dealloc(dbg, cu_context, DW_DLA_CU_CONTEXT); _dwarf_error(dbg, error, DW_DLE_ABBREV_OFFSET_ERROR); return (NULL); } cu_context->cc_abbrev_hash_table = (Dwarf_Hash_Table) _dwarf_get_alloc(dbg, DW_DLA_HASH_TABLE, 1); if (cu_context->cc_abbrev_hash_table == NULL) { _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); return (NULL); } cu_context->cc_debug_info_offset = (Dwarf_Word) offset; dbg->de_info_last_offset = (Dwarf_Word) (offset + length + local_extension_size + local_length_size); if (dbg->de_cu_context_list == NULL) { dbg->de_cu_context_list = cu_context; dbg->de_cu_context_list_end = cu_context; } else { dbg->de_cu_context_list_end->cc_next = cu_context; dbg->de_cu_context_list_end = cu_context; } return (cu_context); } /* Returns offset of next compilation-unit thru next_cu_offset pointer. It basically sequentially moves from one cu to the next. The current cu is recorded internally by libdwarf. The _b form is new for DWARF4 adding new returned fields. */ int dwarf_next_cu_header(Dwarf_Debug dbg, Dwarf_Unsigned * cu_header_length, Dwarf_Half * version_stamp, Dwarf_Unsigned * abbrev_offset, Dwarf_Half * address_size, Dwarf_Unsigned * next_cu_offset, Dwarf_Error * error) { return dwarf_next_cu_header_b(dbg, cu_header_length, version_stamp, abbrev_offset, address_size, 0,0, next_cu_offset, error); } int dwarf_next_cu_header_b(Dwarf_Debug dbg, Dwarf_Unsigned * cu_header_length, Dwarf_Half * version_stamp, Dwarf_Unsigned * abbrev_offset, Dwarf_Half * address_size, Dwarf_Half * offset_size, Dwarf_Half * extension_size, Dwarf_Unsigned * next_cu_offset, Dwarf_Error * error) { /* Offset for current and new CU. */ Dwarf_Unsigned new_offset = 0; /* CU Context for current CU. */ Dwarf_CU_Context cu_context = 0; /* ***** BEGIN CODE ***** */ if (dbg == NULL) { _dwarf_error(NULL, error, DW_DLE_DBG_NULL); return (DW_DLV_ERROR); } /* Get offset into .debug_info of next CU. If dbg has no context, this has to be the first one. */ if (dbg->de_cu_context == NULL) { new_offset = 0; if (!dbg->de_debug_info.dss_data) { int res = _dwarf_load_debug_info(dbg, error); if (res != DW_DLV_OK) { return res; } } } else { new_offset = dbg->de_cu_context->cc_debug_info_offset + dbg->de_cu_context->cc_length + dbg->de_cu_context->cc_length_size + dbg->de_cu_context->cc_extension_size; } /* Check that there is room in .debug_info beyond the new offset for at least a new cu header. If not, return 0 to indicate end of debug_info section, and reset de_cu_debug_info_offset to enable looping back through the cu's. */ if ((new_offset + _dwarf_length_of_cu_header_simple(dbg)) >= dbg->de_debug_info.dss_size) { dbg->de_cu_context = NULL; return (DW_DLV_NO_ENTRY); } /* Check if this CU has been read before. */ cu_context = _dwarf_find_CU_Context(dbg, new_offset); /* If not, make CU Context for it. */ if (cu_context == NULL) { cu_context = _dwarf_make_CU_Context(dbg, new_offset, error); if (cu_context == NULL) { /* Error if CU Context could not be made. Since _dwarf_make_CU_Context has already registered an error we do not do that here: we let the lower error pass thru. */ return (DW_DLV_ERROR); } } dbg->de_cu_context = cu_context; if (cu_header_length != NULL) *cu_header_length = cu_context->cc_length; if (version_stamp != NULL) *version_stamp = cu_context->cc_version_stamp; if (abbrev_offset != NULL) *abbrev_offset = cu_context->cc_abbrev_offset; if (address_size != NULL) *address_size = cu_context->cc_address_size; if (offset_size != NULL) *offset_size = cu_context->cc_length_size; if (extension_size != NULL) *extension_size = cu_context->cc_extension_size; new_offset = new_offset + cu_context->cc_length + cu_context->cc_length_size + cu_context->cc_extension_size; *next_cu_offset = new_offset; return (DW_DLV_OK); } /* This function does two slightly different things depending on the input flag want_AT_sibling. If this flag is true, it checks if the input die has a DW_AT_sibling attribute. If it does it returns a pointer to the start of the sibling die in the .debug_info section. Otherwise it behaves the same as the want_AT_sibling false case. If the want_AT_sibling flag is false, it returns a pointer to the immediately adjacent die in the .debug_info section. Die_info_end points to the end of the .debug_info portion for the cu the die belongs to. It is used to check that the search for the next die does not cross the end of the current cu. Cu_info_start points to the start of the .debug_info portion for the current cu, and is used to add to the offset for DW_AT_sibling attributes. Finally, has_die_child is a pointer to a Dwarf_Bool that is set true if the present die has children, false otherwise. However, in case want_AT_child is true and the die has a DW_AT_sibling attribute *has_die_child is set false to indicate that the children are being skipped. die_info_end points to the last byte+1 of the cu. */ static Dwarf_Byte_Ptr _dwarf_next_die_info_ptr(Dwarf_Byte_Ptr die_info_ptr, Dwarf_CU_Context cu_context, Dwarf_Byte_Ptr die_info_end, Dwarf_Byte_Ptr cu_info_start, Dwarf_Bool want_AT_sibling, Dwarf_Bool * has_die_child) { Dwarf_Byte_Ptr info_ptr = 0; Dwarf_Byte_Ptr abbrev_ptr = 0; Dwarf_Word abbrev_code = 0; Dwarf_Abbrev_List abbrev_list; Dwarf_Half attr = 0; Dwarf_Half attr_form = 0; Dwarf_Unsigned offset = 0; Dwarf_Word leb128_length = 0; Dwarf_Unsigned utmp = 0; Dwarf_Debug dbg = 0; info_ptr = die_info_ptr; DECODE_LEB128_UWORD(info_ptr, utmp); abbrev_code = (Dwarf_Word) utmp; if (abbrev_code == 0) { return NULL; } abbrev_list = _dwarf_get_abbrev_for_code(cu_context, abbrev_code); if (abbrev_list == NULL) { return (NULL); } dbg = cu_context->cc_dbg; *has_die_child = abbrev_list->ab_has_child; abbrev_ptr = abbrev_list->ab_abbrev_ptr; do { Dwarf_Unsigned utmp2; DECODE_LEB128_UWORD(abbrev_ptr, utmp2); attr = (Dwarf_Half) utmp2; DECODE_LEB128_UWORD(abbrev_ptr, utmp2); attr_form = (Dwarf_Half) utmp2; if (attr_form == DW_FORM_indirect) { Dwarf_Unsigned utmp6; /* DECODE_LEB128_UWORD updates info_ptr */ DECODE_LEB128_UWORD(info_ptr, utmp6); attr_form = (Dwarf_Half) utmp6; } if (want_AT_sibling && attr == DW_AT_sibling) { switch (attr_form) { case DW_FORM_ref1: offset = *(Dwarf_Small *) info_ptr; break; case DW_FORM_ref2: /* READ_UNALIGNED does not update info_ptr */ READ_UNALIGNED(dbg, offset, Dwarf_Unsigned, info_ptr, sizeof(Dwarf_Half)); break; case DW_FORM_ref4: READ_UNALIGNED(dbg, offset, Dwarf_Unsigned, info_ptr, sizeof(Dwarf_ufixed)); break; case DW_FORM_ref8: READ_UNALIGNED(dbg, offset, Dwarf_Unsigned, info_ptr, sizeof(Dwarf_Unsigned)); break; case DW_FORM_ref_udata: offset = _dwarf_decode_u_leb128(info_ptr, &leb128_length); break; case DW_FORM_ref_addr: /* Very unusual. The FORM is intended to refer to a different CU, but a different CU cannot be a sibling, can it? We could ignore this and treat as if no DW_AT_sibling present. Or derive the offset from it and if it is in the same CU use it directly. The offset here is *supposed* to be a global offset, so adding cu_info_start is wrong to any offset we find here unless cu_info_start is zero! Lets pretend there is no DW_AT_sibling attribute. */ goto no_sibling_attr; default: return (NULL); } /* Reset *has_die_child to indicate children skipped. */ *has_die_child = false; /* A value beyond die_info_end indicates an error. Exactly at die_info_end means 1-past-cu-end and simply means we are at the end, do not return NULL. Higher level code will detect that we are at the end. */ if (cu_info_start + offset > die_info_end) { /* Error case, bad DWARF. */ return (NULL); } /* At or before end-of-cu */ return (cu_info_start + offset); } no_sibling_attr: if (attr_form != 0) { info_ptr += _dwarf_get_size_of_val(cu_context->cc_dbg, attr_form, cu_context->cc_address_size, info_ptr, cu_context->cc_length_size); /* It is ok for info_ptr == die_info_end, as we will test later before using a too-large info_ptr */ if (info_ptr > die_info_end) { /* More than one-past-end indicates a bug somewhere, likely bad dwarf generation. */ return (NULL); } } } while (attr != 0 || attr_form != 0); return (info_ptr); } /* Given a Dwarf_Debug dbg, and a Dwarf_Die die, it returns a Dwarf_Die for the sibling of die. In case die is NULL, it returns (thru ptr) a Dwarf_Die for the first die in the current cu in dbg. Returns DW_DLV_ERROR on error. It is assumed that every sibling chain including those with only one element is terminated with a NULL die, except a chain with only a NULL die. The algorithm moves from one die to the adjacent one. It returns when the depth of children it sees equals the number of sibling chain terminations. A single count, child_depth is used to track the depth of children and sibling terminations encountered. Child_depth is incremented when a die has the Has-Child flag set unless the child happens to be a NULL die. Child_depth is decremented when a die has Has-Child false, and the adjacent die is NULL. Algorithm returns when child_depth is 0. **NOTE: Do not modify input die, since it is used at the end. */ int dwarf_siblingof(Dwarf_Debug dbg, Dwarf_Die die, Dwarf_Die * caller_ret_die, Dwarf_Error * error) { Dwarf_Die ret_die = 0; Dwarf_Byte_Ptr die_info_ptr = 0; Dwarf_Byte_Ptr cu_info_start = 0; /* die_info_end points 1-past end of die (once set) */ Dwarf_Byte_Ptr die_info_end = 0; Dwarf_Word abbrev_code = 0; Dwarf_Unsigned utmp = 0; if (dbg == NULL) { _dwarf_error(NULL, error, DW_DLE_DBG_NULL); return (DW_DLV_ERROR); } if (die == NULL) { /* Find root die of cu */ /* die_info_end is untouched here, need not be set in this branch. */ Dwarf_Off off2; /* If we've not loaded debug_info, de_cu_context will be NULL, so no need to laod */ if (dbg->de_cu_context == NULL) { _dwarf_error(dbg, error, DW_DLE_DBG_NO_CU_CONTEXT); return (DW_DLV_ERROR); } off2 = dbg->de_cu_context->cc_debug_info_offset; die_info_ptr = dbg->de_debug_info.dss_data + off2 + _dwarf_length_of_cu_header(dbg, off2); } else { /* Find sibling die. */ Dwarf_Bool has_child = false; Dwarf_Sword child_depth = 0; /* We cannot have a legal die unless debug_info was loaded, so no need to load debug_info here. */ CHECK_DIE(die, DW_DLV_ERROR); die_info_ptr = die->di_debug_info_ptr; if (*die_info_ptr == 0) { return (DW_DLV_NO_ENTRY); } cu_info_start = dbg->de_debug_info.dss_data + die->di_cu_context->cc_debug_info_offset; die_info_end = cu_info_start + die->di_cu_context->cc_length + die->di_cu_context->cc_length_size + die->di_cu_context->cc_extension_size; if ((*die_info_ptr) == 0) { return (DW_DLV_NO_ENTRY); } child_depth = 0; do { die_info_ptr = _dwarf_next_die_info_ptr(die_info_ptr, die->di_cu_context, die_info_end, cu_info_start, true, &has_child); if (die_info_ptr == NULL) { _dwarf_error(dbg, error, DW_DLE_NEXT_DIE_PTR_NULL); return (DW_DLV_ERROR); } /* die_info_end is one past end. Do not read it! A test for ``!= die_info_end'' would work as well, but perhaps < reads more like the meaning. */ if(die_info_ptr < die_info_end) { if ((*die_info_ptr) == 0 && has_child) { die_info_ptr++; has_child = false; } } /* die_info_ptr can be one-past-end. */ if ((die_info_ptr == die_info_end) || ((*die_info_ptr) == 0)) { for (; child_depth > 0 && *die_info_ptr == 0; child_depth--, die_info_ptr++); } else { child_depth = has_child ? child_depth + 1 : child_depth; } } while (child_depth != 0); } /* die_info_ptr > die_info_end is really a bug (possibly in dwarf generation)(but we are past end, no more DIEs here), whereas die_info_ptr == die_info_end means 'one past end, no more DIEs here'. */ if (die != NULL && die_info_ptr >= die_info_end) { return (DW_DLV_NO_ENTRY); } if ((*die_info_ptr) == 0) { return (DW_DLV_NO_ENTRY); } ret_die = (Dwarf_Die) _dwarf_get_alloc(dbg, DW_DLA_DIE, 1); if (ret_die == NULL) { _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); return (DW_DLV_ERROR); } ret_die->di_debug_info_ptr = die_info_ptr; ret_die->di_cu_context = die == NULL ? dbg->de_cu_context : die->di_cu_context; DECODE_LEB128_UWORD(die_info_ptr, utmp); abbrev_code = (Dwarf_Word) utmp; if (abbrev_code == 0) { /* Zero means a null DIE */ dwarf_dealloc(dbg, ret_die, DW_DLA_DIE); return (DW_DLV_NO_ENTRY); } ret_die->di_abbrev_code = abbrev_code; ret_die->di_abbrev_list = _dwarf_get_abbrev_for_code(ret_die->di_cu_context, abbrev_code); if (ret_die->di_abbrev_list == NULL || (die == NULL && ret_die->di_abbrev_list-> ab_tag != DW_TAG_compile_unit)) { dwarf_dealloc(dbg, ret_die, DW_DLA_DIE); _dwarf_error(dbg, error, DW_DLE_FIRST_DIE_NOT_CU); return (DW_DLV_ERROR); } *caller_ret_die = ret_die; return (DW_DLV_OK); } int dwarf_child(Dwarf_Die die, Dwarf_Die * caller_ret_die, Dwarf_Error * error) { Dwarf_Byte_Ptr die_info_ptr = 0; /* die_info_end points one-past-end of die area. */ Dwarf_Byte_Ptr die_info_end = 0; Dwarf_Die ret_die = 0; Dwarf_Bool has_die_child = 0; Dwarf_Debug dbg; Dwarf_Word abbrev_code = 0; Dwarf_Unsigned utmp = 0; CHECK_DIE(die, DW_DLV_ERROR); dbg = die->di_cu_context->cc_dbg; die_info_ptr = die->di_debug_info_ptr; /* NULL die has no child. */ if ((*die_info_ptr) == 0) return (DW_DLV_NO_ENTRY); die_info_end = dbg->de_debug_info.dss_data + die->di_cu_context->cc_debug_info_offset + die->di_cu_context->cc_length + die->di_cu_context->cc_length_size + die->di_cu_context->cc_extension_size; die_info_ptr = _dwarf_next_die_info_ptr(die_info_ptr, die->di_cu_context, die_info_end, NULL, false, &has_die_child); if (die_info_ptr == NULL) { _dwarf_error(dbg, error, DW_DLE_NEXT_DIE_PTR_NULL); return (DW_DLV_ERROR); } if (!has_die_child) return (DW_DLV_NO_ENTRY); ret_die = (Dwarf_Die) _dwarf_get_alloc(dbg, DW_DLA_DIE, 1); if (ret_die == NULL) { _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); return (DW_DLV_ERROR); } ret_die->di_debug_info_ptr = die_info_ptr; ret_die->di_cu_context = die->di_cu_context; DECODE_LEB128_UWORD(die_info_ptr, utmp); abbrev_code = (Dwarf_Word) utmp; if (abbrev_code == 0) { /* We have arrived at a null DIE, at the end of a CU or the end of a list of siblings. */ *caller_ret_die = 0; dwarf_dealloc(dbg, ret_die, DW_DLA_DIE); return DW_DLV_NO_ENTRY; } ret_die->di_abbrev_code = abbrev_code; ret_die->di_abbrev_list = _dwarf_get_abbrev_for_code(die->di_cu_context, abbrev_code); if (ret_die->di_abbrev_list == NULL) { dwarf_dealloc(dbg, ret_die, DW_DLA_DIE); _dwarf_error(dbg, error, DW_DLE_DIE_BAD); return (DW_DLV_ERROR); } *caller_ret_die = ret_die; return (DW_DLV_OK); } /* Given a (global, not cu_relative) die offset, this returns a pointer to a DIE thru *new_die. It is up to the caller to do a dwarf_dealloc(dbg,*new_die,DW_DLE_DIE); */ int dwarf_offdie(Dwarf_Debug dbg, Dwarf_Off offset, Dwarf_Die * new_die, Dwarf_Error * error) { Dwarf_CU_Context cu_context = 0; Dwarf_Off new_cu_offset = 0; Dwarf_Die die = 0; Dwarf_Byte_Ptr info_ptr = 0; Dwarf_Unsigned abbrev_code = 0; Dwarf_Unsigned utmp = 0; if (dbg == NULL) { _dwarf_error(NULL, error, DW_DLE_DBG_NULL); return (DW_DLV_ERROR); } cu_context = _dwarf_find_CU_Context(dbg, offset); if (cu_context == NULL) cu_context = _dwarf_find_offdie_CU_Context(dbg, offset); if (cu_context == NULL) { int res = _dwarf_load_debug_info(dbg, error); if (res != DW_DLV_OK) { return res; } if (dbg->de_offdie_cu_context_end != NULL) { Dwarf_CU_Context lcu_context = dbg->de_offdie_cu_context_end; new_cu_offset = lcu_context->cc_debug_info_offset + lcu_context->cc_length + lcu_context->cc_length_size + lcu_context->cc_extension_size; } do { if ((new_cu_offset + _dwarf_length_of_cu_header_simple(dbg)) >= dbg->de_debug_info.dss_size) { _dwarf_error(dbg, error, DW_DLE_OFFSET_BAD); return (DW_DLV_ERROR); } cu_context = _dwarf_make_CU_Context(dbg, new_cu_offset, error); if (cu_context == NULL) { /* Error if CU Context could not be made. Since _dwarf_make_CU_Context has already registered an error we do not do that here: we let the lower error pass thru. */ return (DW_DLV_ERROR); } if (dbg->de_offdie_cu_context == NULL) { dbg->de_offdie_cu_context = cu_context; dbg->de_offdie_cu_context_end = cu_context; } else { dbg->de_offdie_cu_context_end->cc_next = cu_context; dbg->de_offdie_cu_context_end = cu_context; } new_cu_offset = new_cu_offset + cu_context->cc_length + cu_context->cc_length_size; } while (offset >= new_cu_offset); } die = (Dwarf_Die) _dwarf_get_alloc(dbg, DW_DLA_DIE, 1); if (die == NULL) { _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); return (DW_DLV_ERROR); } die->di_cu_context = cu_context; info_ptr = dbg->de_debug_info.dss_data + offset; die->di_debug_info_ptr = info_ptr; DECODE_LEB128_UWORD(info_ptr, utmp); abbrev_code = utmp; if (abbrev_code == 0) { /* we are at a null DIE (or there is a bug). */ *new_die = 0; dwarf_dealloc(dbg, die, DW_DLA_DIE); return DW_DLV_NO_ENTRY; } die->di_abbrev_code = abbrev_code; die->di_abbrev_list = _dwarf_get_abbrev_for_code(cu_context, abbrev_code); if (die->di_abbrev_list == NULL) { dwarf_dealloc(dbg, die, DW_DLA_DIE); _dwarf_error(dbg, error, DW_DLE_DIE_ABBREV_LIST_NULL); return (DW_DLV_ERROR); } *new_die = die; return (DW_DLV_OK); }