1 /* Internals of libgccjit: logging
2 Copyright (C) 2014-2018 Free Software Foundation, Inc.
3 Contributed by David Malcolm <dmalcolm@redhat.com>.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 GCC is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #ifndef JIT_LOGGING_H
22 #define JIT_LOGGING_H
23
24 #include "jit-common.h"
25
26 namespace gcc {
27
28 namespace jit {
29
30 /* A gcc::jit::logger encapsulates a logging stream: a way to send
31 lines of pertinent information to a FILE *. */
32
33 class logger
34 {
35 public:
36 logger (FILE *f_out, int flags, int verbosity);
37 ~logger ();
38
39 void incref (const char *reason);
40 void decref (const char *reason);
41
42 void log (const char *fmt, ...)
43 GNU_PRINTF(2, 3);
44 void log_va (const char *fmt, va_list ap)
45 GNU_PRINTF(2, 0);
46
47 void enter_scope (const char *scope_name);
48 void exit_scope (const char *scope_name);
49
50 private:
51 int m_refcount;
52 FILE *m_f_out;
53 int m_indent_level;
54 bool m_log_refcount_changes;
55 };
56
57 /* The class gcc::jit::log_scope is an RAII-style class intended to make
58 it easy to notify a logger about entering and exiting the body of a
59 given function. */
60
61 class log_scope
62 {
63 public:
64 log_scope (logger *logger, const char *name);
65 ~log_scope ();
66
67 private:
68 logger *m_logger;
69 const char *m_name;
70 };
71
72 /* The constructor for gcc::jit::log_scope.
73
74 The normal case is that the logger is NULL, in which case this should
75 be largely a no-op.
76
77 If we do have a logger, notify it that we're entering the given scope.
78 We also need to hold a reference on it, to avoid a use-after-free
79 when logging the cleanup of the owner of the logger. */
80
81 inline
log_scope(logger * logger,const char * name)82 log_scope::log_scope (logger *logger, const char *name) :
83 m_logger (logger),
84 m_name (name)
85 {
86 if (m_logger)
87 {
88 m_logger->incref ("log_scope ctor");
89 m_logger->enter_scope (m_name);
90 }
91 }
92
93 /* The destructor for gcc::jit::log_scope; essentially the opposite of
94 the constructor. */
95
96 inline
~log_scope()97 log_scope::~log_scope ()
98 {
99 if (m_logger)
100 {
101 m_logger->exit_scope (m_name);
102 m_logger->decref ("log_scope dtor");
103 }
104 }
105
106 /* A gcc::jit::log_user is something that potentially uses a
107 gcc::jit::logger (which could be NULL).
108
109 It is the base class for each of:
110
111 - class gcc::jit::recording::context
112
113 - class gcc::jit::playback::context
114
115 - class gcc::jit::tempdir
116
117 - class gcc::jit::result
118
119 The log_user class keeps the reference-count of a logger up-to-date. */
120
121 class log_user
122 {
123 public:
124 log_user (logger *logger);
125 ~log_user ();
126
get_logger()127 logger * get_logger () const { return m_logger; }
128 void set_logger (logger * logger);
129
130 void log (const char *fmt, ...) const
131 GNU_PRINTF(2, 3);
132
133 void enter_scope (const char *scope_name);
134 void exit_scope (const char *scope_name);
135
136 private:
137 logger *m_logger;
138 };
139
140 /* A shortcut for calling log from a context/result, handling the common
141 case where the underlying logger is NULL via a no-op. */
142
143 inline void
log(const char * fmt,...)144 log_user::log (const char *fmt, ...) const
145 {
146 if (m_logger)
147 {
148 va_list ap;
149 va_start (ap, fmt);
150 m_logger->log_va (fmt, ap);
151 va_end (ap);
152 }
153 }
154
155 /* A shortcut for recording entry into a scope from a context/result,
156 handling the common case where the underlying logger is NULL via
157 a no-op. */
158
159 inline void
enter_scope(const char * scope_name)160 log_user::enter_scope (const char *scope_name)
161 {
162 if (m_logger)
163 m_logger->enter_scope (scope_name);
164 }
165
166 /* A shortcut for recording exit from a scope from a context/result,
167 handling the common case where the underlying logger is NULL via
168 a no-op. */
169
170 inline void
exit_scope(const char * scope_name)171 log_user::exit_scope (const char *scope_name)
172 {
173 if (m_logger)
174 m_logger->exit_scope (scope_name);
175 }
176
177 } // namespace gcc::jit
178
179 } // namespace gcc
180
181 /* If the given logger is non-NULL, log entry/exit of this scope to
182 it, identifying it using __PRETTY_FUNCTION__. */
183
184 #define JIT_LOG_SCOPE(LOGGER) \
185 gcc::jit::log_scope s (LOGGER, __PRETTY_FUNCTION__)
186
187 /* If the given logger is non-NULL, log entry/exit of this scope to
188 it, identifying it using __func__. */
189
190 #define JIT_LOG_FUNC(LOGGER) \
191 gcc::jit::log_scope s (LOGGER, __func__)
192
193 #endif /* JIT_LOGGING_H */
194