platform.cc

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#ifdef _WIN32
// clang-format off
#include <windows.h>
// clang-format on
 
#include <intrin.h>
#include <memoryapi.h>
#include <processthreadsapi.h>
 
#include "src/globals.h"
#include "src/macros.h"
#include "src/platform/platform-base.h"
 
namespace broom {
namespace platform {
 
void* GetStackBottom() {
  ULONG_PTR low;
  ULONG_PTR high;
  GetCurrentThreadStackLimits(&low, &high);
  return SafeCast<void*>(high);
}
 
void UnmapMemorySpace(const MemorySpace& space) {
  BENSURE(VirtualFree(space.StartPtr(), 0, MEM_RELEASE), "VirtualFree failed");
}
 
int GetProtectionFromMemoryPermissions(MemoryPermissions permissions) {
  switch (permissions) {
    case MemoryPermissions::kReadOnly:
      return PAGE_READONLY;
    case MemoryPermissions::kWriteOnly:
      return PAGE_READWRITE;
    case MemoryPermissions::kReadWrite:
      return PAGE_READWRITE;
    case MemoryPermissions::kNone:
      return 0;
  }
  ABORT("Unexpected permissions");
}
 
MemorySpace MapMemorySpace(size_t space_size, MemoryPermissions permissions) {
  int prot = GetProtectionFromMemoryPermissions(permissions);
  void* maybe_pointer =
      VirtualAlloc(nullptr, space_size, MEM_RESERVE | MEM_COMMIT, prot);
  return MemorySpace{maybe_pointer, space_size};
}
}  // namespace platform
}  // namespace broom
#endif