1 /*
2  * trace-event-scripting.  Scripting engine common and initialization code.
3  *
4  * Copyright (C) 2009-2010 Tom Zanussi <tzanussi@gmail.com>
5  *
6  *  This program is free software; you can redistribute it and/or modify
7  *  it under the terms of the GNU General Public License as published by
8  *  the Free Software Foundation; either version 2 of the License, or
9  *  (at your option) any later version.
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *  GNU General Public License for more details.
15  *
16  *  You should have received a copy of the GNU General Public License
17  *  along with this program; if not, write to the Free Software
18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19  *
20  */
21 
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <errno.h>
26 
27 #include "../perf.h"
28 #include "debug.h"
29 #include "util.h"
30 #include "trace-event.h"
31 
32 struct scripting_context *scripting_context;
33 
34 static int flush_script_unsupported(void)
35 {
36 	return 0;
37 }
38 
39 static int stop_script_unsupported(void)
40 {
41 	return 0;
42 }
43 
44 static void process_event_unsupported(union perf_event *event __maybe_unused,
45 				      struct perf_sample *sample __maybe_unused,
46 				      struct perf_evsel *evsel __maybe_unused,
47 				      struct addr_location *al __maybe_unused)
48 {
49 }
50 
51 static void print_python_unsupported_msg(void)
52 {
53 	fprintf(stderr, "Python scripting not supported."
54 		"  Install libpython and rebuild perf to enable it.\n"
55 		"For example:\n  # apt-get install python-dev (ubuntu)"
56 		"\n  # yum install python-devel (Fedora)"
57 		"\n  etc.\n");
58 }
59 
60 static int python_start_script_unsupported(const char *script __maybe_unused,
61 					   int argc __maybe_unused,
62 					   const char **argv __maybe_unused)
63 {
64 	print_python_unsupported_msg();
65 
66 	return -1;
67 }
68 
69 static int python_generate_script_unsupported(struct pevent *pevent
70 					      __maybe_unused,
71 					      const char *outfile
72 					      __maybe_unused)
73 {
74 	print_python_unsupported_msg();
75 
76 	return -1;
77 }
78 
79 struct scripting_ops python_scripting_unsupported_ops = {
80 	.name = "Python",
81 	.start_script = python_start_script_unsupported,
82 	.flush_script = flush_script_unsupported,
83 	.stop_script = stop_script_unsupported,
84 	.process_event = process_event_unsupported,
85 	.generate_script = python_generate_script_unsupported,
86 };
87 
88 static void register_python_scripting(struct scripting_ops *scripting_ops)
89 {
90 	if (scripting_context == NULL)
91 		scripting_context = malloc(sizeof(*scripting_context));
92 
93        if (scripting_context == NULL ||
94 	   script_spec_register("Python", scripting_ops) ||
95 	   script_spec_register("py", scripting_ops)) {
96 		pr_err("Error registering Python script extension: disabling it\n");
97 		zfree(&scripting_context);
98 	}
99 }
100 
101 #ifdef NO_LIBPYTHON
102 void setup_python_scripting(void)
103 {
104 	register_python_scripting(&python_scripting_unsupported_ops);
105 }
106 #else
107 extern struct scripting_ops python_scripting_ops;
108 
109 void setup_python_scripting(void)
110 {
111 	register_python_scripting(&python_scripting_ops);
112 }
113 #endif
114 
115 static void print_perl_unsupported_msg(void)
116 {
117 	fprintf(stderr, "Perl scripting not supported."
118 		"  Install libperl and rebuild perf to enable it.\n"
119 		"For example:\n  # apt-get install libperl-dev (ubuntu)"
120 		"\n  # yum install 'perl(ExtUtils::Embed)' (Fedora)"
121 		"\n  etc.\n");
122 }
123 
124 static int perl_start_script_unsupported(const char *script __maybe_unused,
125 					 int argc __maybe_unused,
126 					 const char **argv __maybe_unused)
127 {
128 	print_perl_unsupported_msg();
129 
130 	return -1;
131 }
132 
133 static int perl_generate_script_unsupported(struct pevent *pevent
134 					    __maybe_unused,
135 					    const char *outfile __maybe_unused)
136 {
137 	print_perl_unsupported_msg();
138 
139 	return -1;
140 }
141 
142 struct scripting_ops perl_scripting_unsupported_ops = {
143 	.name = "Perl",
144 	.start_script = perl_start_script_unsupported,
145 	.flush_script = flush_script_unsupported,
146 	.stop_script = stop_script_unsupported,
147 	.process_event = process_event_unsupported,
148 	.generate_script = perl_generate_script_unsupported,
149 };
150 
151 static void register_perl_scripting(struct scripting_ops *scripting_ops)
152 {
153 	if (scripting_context == NULL)
154 		scripting_context = malloc(sizeof(*scripting_context));
155 
156        if (scripting_context == NULL ||
157 	   script_spec_register("Perl", scripting_ops) ||
158 	   script_spec_register("pl", scripting_ops)) {
159 		pr_err("Error registering Perl script extension: disabling it\n");
160 		zfree(&scripting_context);
161 	}
162 }
163 
164 #ifdef NO_LIBPERL
165 void setup_perl_scripting(void)
166 {
167 	register_perl_scripting(&perl_scripting_unsupported_ops);
168 }
169 #else
170 extern struct scripting_ops perl_scripting_ops;
171 
172 void setup_perl_scripting(void)
173 {
174 	register_perl_scripting(&perl_scripting_ops);
175 }
176 #endif
177