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Summary: While hacking on some code, I ran into a situation where some zero-initialized stat structs weren't actually being zeroed. This was either a compiler bug or a situation where the build system was not correctly rebuilding everything after my changes, and I did not have enough disassembly available to investigate. Either way, since this code assumes zero bits in some nonobvious ways, explicitly assert they are. Reviewed By: xavierd Differential Revision: D23644819 fbshipit-source-id: eb6bff9ff997379113db1e1bf9d6a0a538f10f0b
31 lines
720 B
C++
31 lines
720 B
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#include "eden/fs/utils/Memory.h"
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#include <stdio.h>
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#include <stdlib.h>
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namespace facebook::eden {
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void assertZeroBits(const void* memory, size_t size) {
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if (0 == size) {
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return;
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}
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auto* p = static_cast<const unsigned char*>(memory);
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if (p[0] || memcmp(p, p + 1, size - 1)) {
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fprintf(stderr, "unexpected nonzero bits: ");
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for (size_t i = 0; i < size; ++i) {
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fprintf(stderr, "%01x%01x", p[i] & 15, p[i] >> 4);
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}
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fprintf(stderr, "\n");
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fflush(stderr);
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abort();
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}
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}
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} // namespace facebook::eden
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