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https://github.com/Ryujinx/Ryujinx.git
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135 lines
3.6 KiB
C#
135 lines
3.6 KiB
C#
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using ARMeilleure.CodeGen;
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using ARMeilleure.Memory;
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using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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namespace ARMeilleure.Translation
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{
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static class JitCache
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{
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private const int PageSize = 4 * 1024;
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private const int PageMask = PageSize - 1;
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private const int CodeAlignment = 4; // Bytes
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private const int CacheSize = 512 * 1024 * 1024;
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private static IntPtr _basePointer;
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private static int _offset;
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private static List<JitCacheEntry> _cacheEntries;
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private static object _lock;
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static JitCache()
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{
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_basePointer = MemoryManagement.Allocate(CacheSize);
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if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
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{
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JitUnwindWindows.InstallFunctionTableHandler(_basePointer, CacheSize);
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// The first page is used for the table based SEH structs.
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_offset = PageSize;
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}
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_cacheEntries = new List<JitCacheEntry>();
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_lock = new object();
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}
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public static IntPtr Map(CompiledFunction func)
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{
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byte[] code = func.Code;
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lock (_lock)
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{
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int funcOffset = Allocate(code.Length);
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IntPtr funcPtr = _basePointer + funcOffset;
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Marshal.Copy(code, 0, funcPtr, code.Length);
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ReprotectRange(funcOffset, code.Length);
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Add(new JitCacheEntry(funcOffset, code.Length, func.UnwindInfo));
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return funcPtr;
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}
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}
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private static void ReprotectRange(int offset, int size)
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{
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// Map pages that are already full as RX.
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// Map pages that are not full yet as RWX.
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// On unix, the address must be page aligned.
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int endOffs = offset + size;
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int pageStart = offset & ~PageMask;
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int pageEnd = endOffs & ~PageMask;
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int fullPagesSize = pageEnd - pageStart;
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if (fullPagesSize != 0)
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{
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IntPtr funcPtr = _basePointer + pageStart;
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MemoryManagement.Reprotect(funcPtr, (ulong)fullPagesSize, MemoryProtection.ReadAndExecute);
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}
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int remaining = endOffs - pageEnd;
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if (remaining != 0)
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{
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IntPtr funcPtr = _basePointer + pageEnd;
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MemoryManagement.Reprotect(funcPtr, (ulong)remaining, MemoryProtection.ReadWriteExecute);
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}
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}
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private static int Allocate(int codeSize)
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{
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codeSize = checked(codeSize + (CodeAlignment - 1)) & ~(CodeAlignment - 1);
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int allocOffset = _offset;
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_offset += codeSize;
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if ((ulong)(uint)_offset > CacheSize)
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{
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throw new OutOfMemoryException();
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}
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return allocOffset;
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}
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private static void Add(JitCacheEntry entry)
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{
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_cacheEntries.Add(entry);
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}
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public static bool TryFind(int offset, out JitCacheEntry entry)
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{
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lock (_lock)
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{
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foreach (JitCacheEntry cacheEntry in _cacheEntries)
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{
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int endOffset = cacheEntry.Offset + cacheEntry.Size;
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if (offset >= cacheEntry.Offset && offset < endOffset)
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{
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entry = cacheEntry;
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return true;
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}
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}
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}
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entry = default(JitCacheEntry);
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return false;
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}
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}
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}
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