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

   1 //===-- mem_map_fuchsia.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_FUCHSIA_H_
  10 #define SCUDO_MEM_MAP_FUCHSIA_H_
  11
  12 #include "mem_map_base.h"
  13
  14 #if SCUDO_FUCHSIA
  15
  16 #include <stdint.h>
  17 #include <zircon/types.h>
  18
  19 namespace scudo {
  20
  21 class MemMapFuchsia final : public MemMapBase<MemMapFuchsia> {
  22 public:
  23   constexpr MemMapFuchsia() = default;
  24
  25   // Impls for base functions.
  26   bool mapImpl(uptr Addr, uptr Size, const char *Name, uptr Flags);
  27   void unmapImpl(uptr Addr, uptr Size);
  28   bool remapImpl(uptr Addr, uptr Size, const char *Name, uptr Flags);
  29   void setMemoryPermissionImpl(uptr Addr, uptr Size, uptr Flags);
  30   void releasePagesToOSImpl(uptr From, uptr Size) {
  31     return releaseAndZeroPagesToOSImpl(From, Size);
  32   }
  33   void releaseAndZeroPagesToOSImpl(uptr From, uptr Size);
  34   uptr getBaseImpl() { return WindowBase; }
  35   uptr getCapacityImpl() { return WindowSize; }
  36
  37 private:
  38   friend class ReservedMemoryFuchsia;
  39
  40   // Used by ReservedMemoryFuchsia::dispatch.
  41   MemMapFuchsia(uptr Base, uptr Capacity);
  42
  43   // Virtual memory address corresponding to VMO offset 0.
  44   uptr MapAddr = 0;
  45
  46   // Virtual memory base address and size of the VMO subrange that is still in
  47   // use. unmapImpl() can shrink this range, either at the beginning or at the
  48   // end.
  49   uptr WindowBase = 0;
  50   uptr WindowSize = 0;
  51
  52   zx_handle_t Vmo = ZX_HANDLE_INVALID;
  53 };
  54
  55 class ReservedMemoryFuchsia final
  56     : public ReservedMemory<ReservedMemoryFuchsia, MemMapFuchsia> {
  57 public:
  58   constexpr ReservedMemoryFuchsia() = default;
  59
  60   bool createImpl(uptr Addr, uptr Size, const char *Name, uptr Flags);
  61   void releaseImpl();
  62   MemMapT dispatchImpl(uptr Addr, uptr Size);
  63   uptr getBaseImpl() { return Base; }
  64   uptr getCapacityImpl() { return Capacity; }
  65
  66 private:
  67   uptr Base = 0;
  68   uptr Capacity = 0;
  69 };
  70
  71 } // namespace scudo
  72
  73 #endif // SCUDO_FUCHSIA
  74
  75 #endif // SCUDO_MEM_MAP_FUCHSIA_H_