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Note to BuryPointer.cpp:GraveYard. 'unused' cannot prevent (1) dead store elimination and (2) removal of the global pointer variable (D69428) but 'used' can. Discovered when comparing link maps between HEAD+D69428 and HEAD. Reviewed By: lattner Differential Revision: https://reviews.llvm.org/D101217
31 lines
1.1 KiB
C++
31 lines
1.1 KiB
C++
//===- BuryPointer.cpp - Memory Manipulation/Leak ---------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/BuryPointer.h"
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#include "llvm/Support/Compiler.h"
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#include <atomic>
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namespace llvm {
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void BuryPointer(const void *Ptr) {
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// This function may be called only a small fixed amount of times per each
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// invocation, otherwise we do actually have a leak which we want to report.
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// If this function is called more than kGraveYardMaxSize times, the pointers
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// will not be properly buried and a leak detector will report a leak, which
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// is what we want in such case.
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static const size_t kGraveYardMaxSize = 16;
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LLVM_ATTRIBUTE_USED static const void *GraveYard[kGraveYardMaxSize];
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static std::atomic<unsigned> GraveYardSize;
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unsigned Idx = GraveYardSize++;
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if (Idx >= kGraveYardMaxSize)
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return;
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GraveYard[Idx] = Ptr;
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}
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} // namespace llvm
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