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using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace ChocolArm64.Memory
{
public static class MemoryAlloc
{
public static bool HasWriteWatchSupport => RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
public static IntPtr Allocate(ulong size)
{
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
IntPtr sizeNint = new IntPtr((long)size);
return MemoryAllocWindows.Allocate(sizeNint);
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ||
RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
return MemoryAllocUnix.Allocate(size);
}
else
{
throw new PlatformNotSupportedException();
}
}
public static IntPtr AllocateWriteTracked(ulong size)
{
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
IntPtr sizeNint = new IntPtr((long)size);
return MemoryAllocWindows.AllocateWriteTracked(sizeNint);
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ||
RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
return MemoryAllocUnix.Allocate(size);
}
else
{
throw new PlatformNotSupportedException();
}
}
public static void Reprotect(IntPtr address, ulong size, MemoryProtection permission)
{
bool result;
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
IntPtr sizeNint = new IntPtr((long)size);
result = MemoryAllocWindows.Reprotect(address, sizeNint, permission);
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ||
RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
result = MemoryAllocUnix.Reprotect(address, size, permission);
}
else
{
throw new PlatformNotSupportedException();
}
if (!result)
{
throw new MemoryProtectionException(permission);
}
}
public static bool Free(IntPtr address)
{
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
return MemoryAllocWindows.Free(address);
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ||
RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
return MemoryAllocUnix.Free(address);
}
else
{
throw new PlatformNotSupportedException();
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool GetModifiedPages(
IntPtr address,
IntPtr size,
IntPtr[] addresses,
out ulong count)
{
//This is only supported on windows, but returning
//false (failed) is also valid for platforms without
//write tracking support on the OS.
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
return MemoryAllocWindows.GetModifiedPages(address, size, addresses, out count);
}
else
{
count = 0;
return false;
}
}
}
}
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