lib/Support/BuryPointer.cpp

   1 //===- BuryPointer.cpp - Memory Manipulation/Leak ---------------*- 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 #include "llvm/Support/BuryPointer.h"
  10 #include "llvm/Support/Compiler.h"
  11 #include <atomic>
  12
  13 namespace llvm {
  14
  15 void BuryPointer(const void *Ptr) {
  16   // This function may be called only a small fixed amount of times per each
  17   // invocation, otherwise we do actually have a leak which we want to report.
  18   // If this function is called more than kGraveYardMaxSize times, the pointers
  19   // will not be properly buried and a leak detector will report a leak, which
  20   // is what we want in such case.
  21   static const size_t kGraveYardMaxSize = 16;
  22   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
  23   static std::atomic<unsigned> GraveYardSize;
  24   unsigned Idx = GraveYardSize++;
  25   if (Idx >= kGraveYardMaxSize)
  26     return;
  27   GraveYard[Idx] = Ptr;
  28 }
  29
  30 }