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/* Internals of libgccjit: logging
Copyright (C) 2014-2020 Free Software Foundation, Inc.
Contributed by David Malcolm <dmalcolm@redhat.com>.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef JIT_LOGGING_H
#define JIT_LOGGING_H
#include "jit-common.h"
namespace gcc {
namespace jit {
/* A gcc::jit::logger encapsulates a logging stream: a way to send
lines of pertinent information to a FILE *. */
class logger
{
public:
logger (FILE *f_out, int flags, int verbosity);
~logger ();
void incref (const char *reason);
void decref (const char *reason);
void log (const char *fmt, ...)
GNU_PRINTF(2, 3);
void log_va (const char *fmt, va_list ap)
GNU_PRINTF(2, 0);
void enter_scope (const char *scope_name);
void exit_scope (const char *scope_name);
private:
int m_refcount;
FILE *m_f_out;
int m_indent_level;
bool m_log_refcount_changes;
};
/* The class gcc::jit::log_scope is an RAII-style class intended to make
it easy to notify a logger about entering and exiting the body of a
given function. */
class log_scope
{
public:
log_scope (logger *logger, const char *name);
~log_scope ();
private:
logger *m_logger;
const char *m_name;
};
/* The constructor for gcc::jit::log_scope.
The normal case is that the logger is NULL, in which case this should
be largely a no-op.
If we do have a logger, notify it that we're entering the given scope.
We also need to hold a reference on it, to avoid a use-after-free
when logging the cleanup of the owner of the logger. */
inline
log_scope::log_scope (logger *logger, const char *name) :
m_logger (logger),
m_name (name)
{
if (m_logger)
{
m_logger->incref ("log_scope ctor");
m_logger->enter_scope (m_name);
}
}
/* The destructor for gcc::jit::log_scope; essentially the opposite of
the constructor. */
inline
log_scope::~log_scope ()
{
if (m_logger)
{
m_logger->exit_scope (m_name);
m_logger->decref ("log_scope dtor");
}
}
/* A gcc::jit::log_user is something that potentially uses a
gcc::jit::logger (which could be NULL).
It is the base class for each of:
- class gcc::jit::recording::context
- class gcc::jit::playback::context
- class gcc::jit::tempdir
- class gcc::jit::result
The log_user class keeps the reference-count of a logger up-to-date. */
class log_user
{
public:
log_user (logger *logger);
~log_user ();
logger * get_logger () const { return m_logger; }
void set_logger (logger * logger);
void log (const char *fmt, ...) const
GNU_PRINTF(2, 3);
void enter_scope (const char *scope_name);
void exit_scope (const char *scope_name);
private:
logger *m_logger;
};
/* A shortcut for calling log from a context/result, handling the common
case where the underlying logger is NULL via a no-op. */
inline void
log_user::log (const char *fmt, ...) const
{
if (m_logger)
{
va_list ap;
va_start (ap, fmt);
m_logger->log_va (fmt, ap);
va_end (ap);
}
}
/* A shortcut for recording entry into a scope from a context/result,
handling the common case where the underlying logger is NULL via
a no-op. */
inline void
log_user::enter_scope (const char *scope_name)
{
if (m_logger)
m_logger->enter_scope (scope_name);
}
/* A shortcut for recording exit from a scope from a context/result,
handling the common case where the underlying logger is NULL via
a no-op. */
inline void
log_user::exit_scope (const char *scope_name)
{
if (m_logger)
m_logger->exit_scope (scope_name);
}
} // namespace gcc::jit
} // namespace gcc
/* If the given logger is non-NULL, log entry/exit of this scope to
it, identifying it using __PRETTY_FUNCTION__. */
#define JIT_LOG_SCOPE(LOGGER) \
gcc::jit::log_scope s (LOGGER, __PRETTY_FUNCTION__)
/* If the given logger is non-NULL, log entry/exit of this scope to
it, identifying it using __func__. */
#define JIT_LOG_FUNC(LOGGER) \
gcc::jit::log_scope s (LOGGER, __func__)
#endif /* JIT_LOGGING_H */
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