compiler-rt/lib/scudo/standalone/mem_map_linux.h

   1 //===-- mem_map_linux.h -----------------------------------------*- 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 #ifndef SCUDO_MEM_MAP_LINUX_H_
  10 #define SCUDO_MEM_MAP_LINUX_H_
  11
  12 #include "platform.h"
  13
  14 #if SCUDO_LINUX
  15
  16 #include "common.h"
  17 #include "mem_map_base.h"
  18
  19 namespace scudo {
  20
  21 class MemMapLinux final : public MemMapBase<MemMapLinux> {
  22 public:
  23   constexpr MemMapLinux() = default;
  24   MemMapLinux(uptr Base, uptr Capacity)
  25       : MapBase(Base), MapCapacity(Capacity) {}
  26
  27   // Impls for base functions.
  28   bool mapImpl(uptr Addr, uptr Size, const char *Name, uptr Flags = 0);
  29   void unmapImpl(uptr Addr, uptr Size);
  30   bool remapImpl(uptr Addr, uptr Size, const char *Name, uptr Flags = 0);
  31   void setMemoryPermissionImpl(uptr Addr, uptr Size, uptr Flags);
  32   void releasePagesToOSImpl(uptr From, uptr Size) {
  33     return releaseAndZeroPagesToOSImpl(From, Size);
  34   }
  35   void releaseAndZeroPagesToOSImpl(uptr From, uptr Size);
  36   uptr getBaseImpl() { return MapBase; }
  37   uptr getCapacityImpl() { return MapCapacity; }
  38
  39 private:
  40   uptr MapBase = 0;
  41   uptr MapCapacity = 0;
  42 };
  43
  44 // This will be deprecated when every allocator has been supported by each
  45 // platform's `MemMap` implementation.
  46 class ReservedMemoryLinux final
  47     : public ReservedMemory<ReservedMemoryLinux, MemMapLinux> {
  48 public:
  49   // The following two are the Impls for function in `MemMapBase`.
  50   uptr getBaseImpl() { return MapBase; }
  51   uptr getCapacityImpl() { return MapCapacity; }
  52
  53   // These threes are specific to `ReservedMemory`.
  54   bool createImpl(uptr Addr, uptr Size, const char *Name, uptr Flags);
  55   void releaseImpl();
  56   MemMapT dispatchImpl(uptr Addr, uptr Size);
  57
  58 private:
  59   uptr MapBase = 0;
  60   uptr MapCapacity = 0;
  61 };
  62
  63 } // namespace scudo
  64
  65 #endif // SCUDO_LINUX
  66
  67 #endif // SCUDO_MEM_MAP_LINUX_H_