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
61ptrdiff_t
62dwarf_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