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      1 //===-- Valgrind.cpp - Implement Valgrind communication ---------*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 //  Defines Valgrind communication methods, if HAVE_VALGRIND_VALGRIND_H is
     11 //  defined.  If we have valgrind.h but valgrind isn't running, its macros are
     12 //  no-ops.
     13 //
     14 //===----------------------------------------------------------------------===//
     15 
     16 #include "llvm/Support/Valgrind.h"
     17 #include "llvm/Config/config.h"
     18 
     19 #if HAVE_VALGRIND_VALGRIND_H
     20 #include <valgrind/valgrind.h>
     21 
     22 static bool InitNotUnderValgrind() {
     23   return !RUNNING_ON_VALGRIND;
     24 }
     25 
     26 // This bool is negated from what we'd expect because code may run before it
     27 // gets initialized.  If that happens, it will appear to be 0 (false), and we
     28 // want that to cause the rest of the code in this file to run the
     29 // Valgrind-provided macros.
     30 static const bool NotUnderValgrind = InitNotUnderValgrind();
     31 
     32 bool llvm::sys::RunningOnValgrind() {
     33   if (NotUnderValgrind)
     34     return false;
     35   return RUNNING_ON_VALGRIND;
     36 }
     37 
     38 void llvm::sys::ValgrindDiscardTranslations(const void *Addr, size_t Len) {
     39   if (NotUnderValgrind)
     40     return;
     41 
     42   VALGRIND_DISCARD_TRANSLATIONS(Addr, Len);
     43 }
     44 
     45 #else  // !HAVE_VALGRIND_VALGRIND_H
     46 
     47 bool llvm::sys::RunningOnValgrind() {
     48   return false;
     49 }
     50 
     51 void llvm::sys::ValgrindDiscardTranslations(const void *Addr, size_t Len) {
     52 }
     53 
     54 #endif  // !HAVE_VALGRIND_VALGRIND_H
     55 
     56 #if LLVM_ENABLE_THREADS != 0 && !defined(NDEBUG)
     57 // These functions require no implementation, tsan just looks at the arguments
     58 // they're called with.
     59 extern "C" {
     60 void AnnotateHappensBefore(const char *file, int line,
     61                            const volatile void *cv) {}
     62 void AnnotateHappensAfter(const char *file, int line,
     63                           const volatile void *cv) {}
     64 void AnnotateIgnoreWritesBegin(const char *file, int line) {}
     65 void AnnotateIgnoreWritesEnd(const char *file, int line) {}
     66 }
     67 #endif
     68