1 /* Get macro information.
2 Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc.
3 This file is part of Red Hat elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6 Red Hat elfutils is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by the
8 Free Software Foundation; version 2 of the License.
9
10 Red Hat elfutils is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License along
16 with Red Hat elfutils; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
18
19 In addition, as a special exception, Red Hat, Inc. gives You the
20 additional right to link the code of Red Hat elfutils with code licensed
21 under any Open Source Initiative certified open source license
22 (http://www.opensource.org/licenses/index.php) which requires the
23 distribution of source code with any binary distribution and to
24 distribute linked combinations of the two. Non-GPL Code permitted under
25 this exception must only link to the code of Red Hat elfutils through
26 those well defined interfaces identified in the file named EXCEPTION
27 found in the source code files (the "Approved Interfaces"). The files
28 of Non-GPL Code may instantiate templates or use macros or inline
29 functions from the Approved Interfaces without causing the resulting
30 work to be covered by the GNU General Public License. Only Red Hat,
31 Inc. may make changes or additions to the list of Approved Interfaces.
32 Red Hat's grant of this exception is conditioned upon your not adding
33 any new exceptions. If you wish to add a new Approved Interface or
34 exception, please contact Red Hat. You must obey the GNU General Public
35 License in all respects for all of the Red Hat elfutils code and other
36 code used in conjunction with Red Hat elfutils except the Non-GPL Code
37 covered by this exception. If you modify this file, you may extend this
38 exception to your version of the file, but you are not obligated to do
39 so. If you do not wish to provide this exception without modification,
40 you must delete this exception statement from your version and license
41 this file solely under the GPL without exception.
42
43 Red Hat elfutils is an included package of the Open Invention Network.
44 An included package of the Open Invention Network is a package for which
45 Open Invention Network licensees cross-license their patents. No patent
46 license is granted, either expressly or impliedly, by designation as an
47 included package. Should you wish to participate in the Open Invention
48 Network licensing program, please visit www.openinventionnetwork.com
49 <http://www.openinventionnetwork.com>. */
50
51 #ifdef HAVE_CONFIG_H
52 # include <config.h>
53 #endif
54
55 #include <dwarf.h>
56 #include <string.h>
57
58 #include <libdwP.h>
59
60
61 ptrdiff_t
dwarf_getmacros(die,callback,arg,offset)62 dwarf_getmacros (die, callback, arg, offset)
63 Dwarf_Die *die;
64 int (*callback) (Dwarf_Macro *, void *);
65 void *arg;
66 ptrdiff_t offset;
67 {
68 /* Get the appropriate attribute. */
69 Dwarf_Attribute attr;
70 if (INTUSE(dwarf_attr) (die, DW_AT_macro_info, &attr) == NULL)
71 return -1;
72
73 /* Offset into the .debug_macinfo section. */
74 Dwarf_Word macoff;
75 if (INTUSE(dwarf_formudata) (&attr, &macoff) != 0)
76 return -1;
77
78 const unsigned char *readp
79 = die->cu->dbg->sectiondata[IDX_debug_macinfo]->d_buf + offset;
80 const unsigned char *readendp
81 = readp + die->cu->dbg->sectiondata[IDX_debug_macinfo]->d_size;
82
83 if (readp == readendp)
84 return 0;
85
86 if (*readp != DW_MACINFO_start_file)
87 goto invalid;
88
89 while (readp < readendp)
90 {
91 unsigned int opcode = *readp++;
92 unsigned int u128;
93 unsigned int u128_2 = 0;
94 const char *str = NULL;
95 const unsigned char *endp;
96
97 switch (opcode)
98 {
99 case DW_MACINFO_define:
100 case DW_MACINFO_undef:
101 case DW_MACINFO_vendor_ext:
102 /* For the first two opcodes the parameters are
103 line, string
104 For the latter
105 number, string.
106 We can treat these cases together. */
107 get_uleb128 (u128, readp);
108
109 endp = memchr (readp, '\0', readendp - readp);
110 if (endp == NULL)
111 goto invalid;
112
113 str = (char *) readp;
114 readp = endp + 1;
115 break;
116
117 case DW_MACINFO_start_file:
118 /* The two parameters are line and file index. */
119 get_uleb128 (u128, readp);
120 get_uleb128 (u128_2, readp);
121 break;
122
123 case DW_MACINFO_end_file:
124 /* No parameters for this one. */
125 u128 = 0;
126 break;
127
128 case 0:
129 /* Nothing more to do. */
130 return 0;
131
132 default:
133 goto invalid;
134 }
135
136 Dwarf_Macro mac;
137 mac.opcode = opcode;
138 mac.param1 = u128;
139 if (str == NULL)
140 mac.param2.u = u128_2;
141 else
142 mac.param2.s = str;
143
144 if (callback (&mac, arg) != DWARF_CB_OK)
145 return (readp
146 - ((unsigned char *) die->cu->dbg->sectiondata[IDX_debug_macinfo]->d_buf
147 + offset));
148 }
149
150 /* If we come here the termination of the data for the CU is not
151 present. */
152 invalid:
153 __libdw_seterrno (DWARF_E_INVALID_DWARF);
154 return -1;
155 }
156