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/thirdparty/breakpad/third_party/glog/src/glog/vlog_is_on.h.in

http://github.com/tomahawk-player/tomahawk
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  1// Copyright (c) 1999, 2007, Google Inc.
  2// All rights reserved.
  3//
  4// Redistribution and use in source and binary forms, with or without
  5// modification, are permitted provided that the following conditions are
  6// met:
  7//
  8//     * Redistributions of source code must retain the above copyright
  9// notice, this list of conditions and the following disclaimer.
 10//     * Redistributions in binary form must reproduce the above
 11// copyright notice, this list of conditions and the following disclaimer
 12// in the documentation and/or other materials provided with the
 13// distribution.
 14//     * Neither the name of Google Inc. nor the names of its
 15// contributors may be used to endorse or promote products derived from
 16// this software without specific prior written permission.
 17//
 18// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 19// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 20// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 21// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 22// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 23// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 24// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 25// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 26// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 27// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 29//
 30// Author: Ray Sidney and many others
 31//
 32// Defines the VLOG_IS_ON macro that controls the variable-verbosity
 33// conditional logging.
 34//
 35// It's used by VLOG and VLOG_IF in logging.h
 36// and by RAW_VLOG in raw_logging.h to trigger the logging.
 37//
 38// It can also be used directly e.g. like this:
 39//   if (VLOG_IS_ON(2)) {
 40//     // do some logging preparation and logging
 41//     // that can't be accomplished e.g. via just VLOG(2) << ...;
 42//   }
 43//
 44// The truth value that VLOG_IS_ON(level) returns is determined by 
 45// the three verbosity level flags:
 46//   --v=<n>  Gives the default maximal active V-logging level;
 47//            0 is the default.
 48//            Normally positive values are used for V-logging levels.
 49//   --vmodule=<str>  Gives the per-module maximal V-logging levels to override
 50//                    the value given by --v.
 51//                    E.g. "my_module=2,foo*=3" would change the logging level
 52//                    for all code in source files "my_module.*" and "foo*.*"
 53//                    ("-inl" suffixes are also disregarded for this matching).
 54//
 55// SetVLOGLevel helper function is provided to do limited dynamic control over
 56// V-logging by overriding the per-module settings given via --vmodule flag.
 57//
 58// CAVEAT: --vmodule functionality is not available in non gcc compilers.
 59//
 60
 61#ifndef BASE_VLOG_IS_ON_H_
 62#define BASE_VLOG_IS_ON_H_
 63
 64#include "glog/log_severity.h"
 65
 66// Annoying stuff for windows -- makes sure clients can import these functions
 67#ifndef GOOGLE_GLOG_DLL_DECL
 68# if defined(_WIN32) && !defined(__CYGWIN__)
 69#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
 70# else
 71#   define GOOGLE_GLOG_DLL_DECL
 72# endif
 73#endif
 74
 75#if defined(__GNUC__)
 76// We emit an anonymous static int* variable at every VLOG_IS_ON(n) site.
 77// (Normally) the first time every VLOG_IS_ON(n) site is hit,
 78// we determine what variable will dynamically control logging at this site:
 79// it's either FLAGS_v or an appropriate internal variable
 80// matching the current source file that represents results of
 81// parsing of --vmodule flag and/or SetVLOGLevel calls.
 82#define VLOG_IS_ON(verboselevel)                                \
 83  __extension__  \
 84  ({ static @ac_google_namespace@::int32* vlocal__ = &@ac_google_namespace@::kLogSiteUninitialized;           \
 85     @ac_google_namespace@::int32 verbose_level__ = (verboselevel);                    \
 86     (*vlocal__ >= verbose_level__) &&                          \
 87     ((vlocal__ != &@ac_google_namespace@::kLogSiteUninitialized) ||                   \
 88      (@ac_google_namespace@::InitVLOG3__(&vlocal__, &FLAGS_v,                         \
 89                   __FILE__, verbose_level__))); })
 90#else
 91// GNU extensions not available, so we do not support --vmodule.
 92// Dynamic value of FLAGS_v always controls the logging level.
 93#define VLOG_IS_ON(verboselevel) (FLAGS_v >= (verboselevel))
 94#endif
 95
 96// Set VLOG(_IS_ON) level for module_pattern to log_level.
 97// This lets us dynamically control what is normally set by the --vmodule flag.
 98// Returns the level that previously applied to module_pattern.
 99// NOTE: To change the log level for VLOG(_IS_ON) sites
100//	 that have already executed after/during InitGoogleLogging,
101//	 one needs to supply the exact --vmodule pattern that applied to them.
102//       (If no --vmodule pattern applied to them
103//       the value of FLAGS_v will continue to control them.)
104extern GOOGLE_GLOG_DLL_DECL int SetVLOGLevel(const char* module_pattern,
105                                             int log_level);
106
107// Various declarations needed for VLOG_IS_ON above: =========================
108
109// Special value used to indicate that a VLOG_IS_ON site has not been
110// initialized.  We make this a large value, so the common-case check
111// of "*vlocal__ >= verbose_level__" in VLOG_IS_ON definition
112// passes in such cases and InitVLOG3__ is then triggered.
113extern @ac_google_namespace@::int32 kLogSiteUninitialized;
114
115// Helper routine which determines the logging info for a particalur VLOG site.
116//   site_flag     is the address of the site-local pointer to the controlling
117//                 verbosity level
118//   site_default  is the default to use for *site_flag
119//   fname         is the current source file name
120//   verbose_level is the argument to VLOG_IS_ON
121// We will return the return value for VLOG_IS_ON
122// and if possible set *site_flag appropriately.
123extern GOOGLE_GLOG_DLL_DECL bool InitVLOG3__(
124    @ac_google_namespace@::int32** site_flag,
125    @ac_google_namespace@::int32* site_default,
126    const char* fname,
127    @ac_google_namespace@::int32 verbose_level);
128
129#endif  // BASE_VLOG_IS_ON_H_