third_party/WebKit/Source/wtf/DynamicAnnotations.cpp

   1 /*
   2  * Copyright (C) 2011 Google Inc. 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  *     * Neither the name of Google Inc. nor the names of its
  11  * contributors may be used to endorse or promote products derived from
  12  * this software without specific prior written permission.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  15  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  16  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  17  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  18  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  19  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  20  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "config.h"
  28
  29 #include "DynamicAnnotations.h"
  30
  31 #if USE(DYNAMIC_ANNOTATIONS) && !USE(DYNAMIC_ANNOTATIONS_NOIMPL)
  32
  33 // Identical code folding(-Wl,--icf=all) countermeasures.
  34 // This makes all Annotate* functions different, which prevents the linker from
  35 // folding them.
  36 #ifdef __COUNTER__
  37 #define DYNAMIC_ANNOTATIONS_IMPL \
  38     volatile short lineno = (__LINE__ << 8) + __COUNTER__; \
  39     (void)lineno;
  40 #else
  41 #define DYNAMIC_ANNOTATIONS_IMPL \
  42     volatile short lineno = (__LINE__ << 8); \
  43     (void)lineno;
  44 #endif
  45
  46 void WTFAnnotateBenignRaceSized(const char*, int, const volatile void*, long, const char*)
  47 {
  48     DYNAMIC_ANNOTATIONS_IMPL
  49 }
  50
  51 void WTFAnnotateHappensBefore(const char*, int, const volatile void*)
  52 {
  53     DYNAMIC_ANNOTATIONS_IMPL
  54 }
  55
  56 void WTFAnnotateHappensAfter(const char*, int, const volatile void*)
  57 {
  58     DYNAMIC_ANNOTATIONS_IMPL
  59 }
  60
  61 #endif // USE(DYNAMIC_ANNOTATIONS) && !USE(DYNAMIC_ANNOTATIONS_NOIMPL)