Add dvlog_always_on to enable DVLOG without DEBUG and DCHECK option

base/logging.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_LOGGING_H_
 #define BASE_LOGGING_H_
 
 #include <stddef.h>
 
 #include <cassert>
@@ skipping 751 matching lines @@
 #define CHECK_LT(val1, val2) CHECK_OP(LT, < , val1, val2)
 #define CHECK_GE(val1, val2) CHECK_OP(GE, >=, val1, val2)
 #define CHECK_GT(val1, val2) CHECK_OP(GT, > , val1, val2)
 
 #if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
 #define DCHECK_IS_ON() 0
 #else
 #define DCHECK_IS_ON() 1
 #endif
 
+#if defined(NDEBUG) && !defined(DVLOG_ALWAYS_ON)
+#define DVLOG_IS_ON() 0
+#else
+#define DVLOG_IS_ON() 1
+#endif
+
 // Definitions for DLOG et al.
 
-#if DCHECK_IS_ON()
+#if DCHECK_IS_ON() || DVLOG_IS_ON()
 
 #define DLOG_IS_ON(severity) LOG_IS_ON(severity)
 #define DLOG_IF(severity, condition) LOG_IF(severity, condition)
 #define DLOG_ASSERT(condition) LOG_ASSERT(condition)
 #define DPLOG_IF(severity, condition) PLOG_IF(severity, condition)
 #define DVLOG_IF(verboselevel, condition) VLOG_IF(verboselevel, condition)
 #define DVPLOG_IF(verboselevel, condition) VPLOG_IF(verboselevel, condition)
 
-#else  // DCHECK_IS_ON()
+#else  // DCHECK_IS_ON() || DVLOG_IS_ON())
 
 // If !DCHECK_IS_ON(), we want to avoid emitting any references to |condition|
 // (which may reference a variable defined only if DCHECK_IS_ON()).
 // Contrast this with DCHECK et al., which has different behavior.
 
 #define DLOG_IS_ON(severity) false
 #define DLOG_IF(severity, condition) EAT_STREAM_PARAMETERS
 #define DLOG_ASSERT(condition) EAT_STREAM_PARAMETERS
 #define DPLOG_IF(severity, condition) EAT_STREAM_PARAMETERS
 #define DVLOG_IF(verboselevel, condition) EAT_STREAM_PARAMETERS
 #define DVPLOG_IF(verboselevel, condition) EAT_STREAM_PARAMETERS
 
-#endif  // DCHECK_IS_ON()
+#endif  // DCHECK_IS_ON() || DVLOG_IS_ON())
 
 #define DLOG(severity)                                          \
   LAZY_STREAM(LOG_STREAM(severity), DLOG_IS_ON(severity))
 
 #define DPLOG(severity)                                         \
   LAZY_STREAM(PLOG_STREAM(severity), DLOG_IS_ON(severity))
 
 #define DVLOG(verboselevel) DVLOG_IF(verboselevel, VLOG_IS_ON(verboselevel))
 
 #define DVPLOG(verboselevel) DVPLOG_IF(verboselevel, VLOG_IS_ON(verboselevel))
@@ skipping 360 matching lines @@
 #elif NOTIMPLEMENTED_POLICY == 5
 #define NOTIMPLEMENTED() do {\
   static bool logged_once = false;\
   LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\
   logged_once = true;\
 } while(0);\
 EAT_STREAM_PARAMETERS
 #endif
 
 #endif  // BASE_LOGGING_H_