lib/Support/Valgrind.cpp

   1 //===-- Valgrind.cpp - Implement Valgrind communication ---------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 //  Defines Valgrind communication methods, if HAVE_VALGRIND_VALGRIND_H is
  10 //  defined.  If we have valgrind.h but valgrind isn't running, its macros are
  11 //  no-ops.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/Support/Valgrind.h"
  16 #include "llvm/Config/config.h"
  17 #include <cstddef>
  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