lib/Support/Valgrind.cpp

   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 #include <cstddef>
  19
  20 #if HAVE_VALGRIND_VALGRIND_H
  21 #include <valgrind/valgrind.h>
  22
  23 static bool InitNotUnderValgrind() {
  24   return !RUNNING_ON_VALGRIND;
  25 }
  26
  27 // This bool is negated from what we'd expect because code may run before it
  28 // gets initialized.  If that happens, it will appear to be 0 (false), and we
  29 // want that to cause the rest of the code in this file to run the
  30 // Valgrind-provided macros.
  31 static const bool NotUnderValgrind = InitNotUnderValgrind();
  32
  33 bool llvm::sys::RunningOnValgrind() {
  34   if (NotUnderValgrind)
  35     return false;
  36   return RUNNING_ON_VALGRIND;
  37 }
  38
  39 void llvm::sys::ValgrindDiscardTranslations(const void *Addr, size_t Len) {
  40   if (NotUnderValgrind)
  41     return;
  42
  43   VALGRIND_DISCARD_TRANSLATIONS(Addr, Len);
  44 }
  45
  46 #else  // !HAVE_VALGRIND_VALGRIND_H
  47
  48 bool llvm::sys::RunningOnValgrind() {
  49   return false;
  50 }
  51
  52 void llvm::sys::ValgrindDiscardTranslations(const void *Addr, size_t Len) {
  53 }
  54
  55 #endif  // !HAVE_VALGRIND_VALGRIND_H