compiler-rt/lib/scudo/standalone/common.cpp

   1 //===-- common.cpp ----------------------------------------------*- 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 "common.h"
  10 #include "atomic_helpers.h"
  11 #include "string_utils.h"
  12
  13 namespace scudo {
  14
  15 #if !defined(SCUDO_PAGE_SIZE)
  16 uptr PageSizeCached = 0;
  17 uptr PageSizeLogCached = 0;
  18
  19 // Must be defined in platform specific code.
  20 uptr getPageSize();
  21
  22 // This must be called in the init path or there could be a race if multiple
  23 // threads try to set the cached values.
  24 uptr getPageSizeSlow() {
  25   PageSizeCached = getPageSize();
  26   CHECK_NE(PageSizeCached, 0);
  27   PageSizeLogCached = getLog2(PageSizeCached);
  28   return PageSizeCached;
  29 }
  30 #endif
  31
  32 } // namespace scudo