1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * trace-event-scripting.  Scripting engine common and initialization code.
4  *
5  * Copyright (C) 2009-2010 Tom Zanussi <tzanussi@gmail.com>
6  */
7 
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <errno.h>
12 
13 #include "../perf.h"
14 #include "debug.h"
15 #include "trace-event.h"
16 #include <linux/zalloc.h>
17 
18 struct scripting_context *scripting_context;
19 
20 static int flush_script_unsupported(void)
21 {
22 	return 0;
23 }
24 
25 static int stop_script_unsupported(void)
26 {
27 	return 0;
28 }
29 
30 static void process_event_unsupported(union perf_event *event __maybe_unused,
31 				      struct perf_sample *sample __maybe_unused,
32 				      struct perf_evsel *evsel __maybe_unused,
33 				      struct addr_location *al __maybe_unused)
34 {
35 }
36 
37 static void print_python_unsupported_msg(void)
38 {
39 	fprintf(stderr, "Python scripting not supported."
40 		"  Install libpython and rebuild perf to enable it.\n"
41 		"For example:\n  # apt-get install python-dev (ubuntu)"
42 		"\n  # yum install python-devel (Fedora)"
43 		"\n  etc.\n");
44 }
45 
46 static int python_start_script_unsupported(const char *script __maybe_unused,
47 					   int argc __maybe_unused,
48 					   const char **argv __maybe_unused)
49 {
50 	print_python_unsupported_msg();
51 
52 	return -1;
53 }
54 
55 static int python_generate_script_unsupported(struct tep_handle *pevent
56 					      __maybe_unused,
57 					      const char *outfile
58 					      __maybe_unused)
59 {
60 	print_python_unsupported_msg();
61 
62 	return -1;
63 }
64 
65 struct scripting_ops python_scripting_unsupported_ops = {
66 	.name = "Python",
67 	.start_script = python_start_script_unsupported,
68 	.flush_script = flush_script_unsupported,
69 	.stop_script = stop_script_unsupported,
70 	.process_event = process_event_unsupported,
71 	.generate_script = python_generate_script_unsupported,
72 };
73 
74 static void register_python_scripting(struct scripting_ops *scripting_ops)
75 {
76 	if (scripting_context == NULL)
77 		scripting_context = malloc(sizeof(*scripting_context));
78 
79        if (scripting_context == NULL ||
80 	   script_spec_register("Python", scripting_ops) ||
81 	   script_spec_register("py", scripting_ops)) {
82 		pr_err("Error registering Python script extension: disabling it\n");
83 		zfree(&scripting_context);
84 	}
85 }
86 
87 #ifndef HAVE_LIBPYTHON_SUPPORT
88 void setup_python_scripting(void)
89 {
90 	register_python_scripting(&python_scripting_unsupported_ops);
91 }
92 #else
93 extern struct scripting_ops python_scripting_ops;
94 
95 void setup_python_scripting(void)
96 {
97 	register_python_scripting(&python_scripting_ops);
98 }
99 #endif
100 
101 static void print_perl_unsupported_msg(void)
102 {
103 	fprintf(stderr, "Perl scripting not supported."
104 		"  Install libperl and rebuild perf to enable it.\n"
105 		"For example:\n  # apt-get install libperl-dev (ubuntu)"
106 		"\n  # yum install 'perl(ExtUtils::Embed)' (Fedora)"
107 		"\n  etc.\n");
108 }
109 
110 static int perl_start_script_unsupported(const char *script __maybe_unused,
111 					 int argc __maybe_unused,
112 					 const char **argv __maybe_unused)
113 {
114 	print_perl_unsupported_msg();
115 
116 	return -1;
117 }
118 
119 static int perl_generate_script_unsupported(struct tep_handle *pevent
120 					    __maybe_unused,
121 					    const char *outfile __maybe_unused)
122 {
123 	print_perl_unsupported_msg();
124 
125 	return -1;
126 }
127 
128 struct scripting_ops perl_scripting_unsupported_ops = {
129 	.name = "Perl",
130 	.start_script = perl_start_script_unsupported,
131 	.flush_script = flush_script_unsupported,
132 	.stop_script = stop_script_unsupported,
133 	.process_event = process_event_unsupported,
134 	.generate_script = perl_generate_script_unsupported,
135 };
136 
137 static void register_perl_scripting(struct scripting_ops *scripting_ops)
138 {
139 	if (scripting_context == NULL)
140 		scripting_context = malloc(sizeof(*scripting_context));
141 
142        if (scripting_context == NULL ||
143 	   script_spec_register("Perl", scripting_ops) ||
144 	   script_spec_register("pl", scripting_ops)) {
145 		pr_err("Error registering Perl script extension: disabling it\n");
146 		zfree(&scripting_context);
147 	}
148 }
149 
150 #ifndef HAVE_LIBPERL_SUPPORT
151 void setup_perl_scripting(void)
152 {
153 	register_perl_scripting(&perl_scripting_unsupported_ops);
154 }
155 #else
156 extern struct scripting_ops perl_scripting_ops;
157 
158 void setup_perl_scripting(void)
159 {
160 	register_perl_scripting(&perl_scripting_ops);
161 }
162 #endif
163