1 /* Return block represented by attribute.
2 Copyright (C) 2004 Red Hat, Inc.
3 Written by Ulrich Drepper <drepper@redhat.com>, 2004.
4
5 This program is Open Source software; you can redistribute it and/or
6 modify it under the terms of the Open Software License version 1.0 as
7 published by the Open Source Initiative.
8
9 You should have received a copy of the Open Software License along
10 with this program; if not, you may obtain a copy of the Open Software
11 License version 1.0 from http://www.opensource.org/licenses/osl.php or
12 by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
13 3001 King Ranch Road, Ukiah, CA 95482. */
14
15 #ifdef HAVE_CONFIG_H
16 # include <config.h>
17 #endif
18
19 #include <dwarf.h>
20 #include "libdwP.h"
21
22
23 int
dwarf_formblock(attr,return_block)24 dwarf_formblock (attr, return_block)
25 Dwarf_Attribute *attr;
26 Dwarf_Block *return_block;
27 {
28 if (attr == NULL)
29 return -1;
30
31 unsigned int u128;
32 unsigned char *datap;
33
34 switch (attr->form)
35 {
36 case DW_FORM_block1:
37 return_block->length = *(uint8_t *) attr->valp;
38 return_block->data = attr->valp + 1;
39 break;
40
41 case DW_FORM_block2:
42 return_block->length = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
43 return_block->data = attr->valp + 2;
44 break;
45
46 case DW_FORM_block4:
47 return_block->length = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
48 return_block->data = attr->valp + 4;
49 break;
50
51 case DW_FORM_block:
52 datap = attr->valp;
53 get_uleb128 (u128, datap);
54 return_block->length = u128;
55 return_block->data = datap;
56 break;
57
58 default:
59 __libdw_seterrno (DWARF_E_NO_BLOCK);
60 return -1;
61 }
62
63 if (return_block->data + return_block->length
64 > ((unsigned char *) attr->cu->dbg->sectiondata[IDX_debug_info]->d_buf
65 + attr->cu->dbg->sectiondata[IDX_debug_info]->d_size))
66 {
67 /* Block does not fit. */
68 __libdw_seterrno (DWARF_E_INVALID_DWARF);
69 return -1;
70 }
71
72 return 0;
73 }
74