mirror of
https://github.com/Ryujinx/Ryujinx.git
synced 2024-09-10 13:43:17 +02:00
407 lines
12 KiB
C#
407 lines
12 KiB
C#
using Ryujinx.Graphics.Shader.Instructions;
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using System;
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using System.Buffers.Binary;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection.Emit;
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using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
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namespace Ryujinx.Graphics.Shader.Decoders
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{
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static class Decoder
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{
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private delegate object OpActivator(InstEmitter emitter, ulong address, long opCode);
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private static ConcurrentDictionary<Type, OpActivator> _opActivators;
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static Decoder()
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{
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_opActivators = new ConcurrentDictionary<Type, OpActivator>();
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}
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public static Block[] Decode(Span<byte> code, ulong headerSize)
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{
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List<Block> blocks = new List<Block>();
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Queue<Block> workQueue = new Queue<Block>();
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Dictionary<ulong, Block> visited = new Dictionary<ulong, Block>();
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Block GetBlock(ulong blkAddress)
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{
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if (!visited.TryGetValue(blkAddress, out Block block))
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{
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block = new Block(blkAddress);
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workQueue.Enqueue(block);
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visited.Add(blkAddress, block);
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}
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return block;
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}
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ulong startAddress = headerSize;
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GetBlock(startAddress);
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while (workQueue.TryDequeue(out Block currBlock))
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{
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// Check if the current block is inside another block.
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if (BinarySearch(blocks, currBlock.Address, out int nBlkIndex))
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{
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Block nBlock = blocks[nBlkIndex];
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if (nBlock.Address == currBlock.Address)
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{
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throw new InvalidOperationException("Found duplicate block address on the list.");
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}
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nBlock.Split(currBlock);
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blocks.Insert(nBlkIndex + 1, currBlock);
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continue;
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}
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// If we have a block after the current one, set the limit address.
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ulong limitAddress = (ulong)code.Length;
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if (nBlkIndex != blocks.Count)
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{
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Block nBlock = blocks[nBlkIndex];
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int nextIndex = nBlkIndex + 1;
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if (nBlock.Address < currBlock.Address && nextIndex < blocks.Count)
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{
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limitAddress = blocks[nextIndex].Address;
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}
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else if (nBlock.Address > currBlock.Address)
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{
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limitAddress = blocks[nBlkIndex].Address;
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}
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}
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FillBlock(code, currBlock, limitAddress, startAddress);
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if (currBlock.OpCodes.Count != 0)
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{
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foreach (OpCodeSsy ssyOp in currBlock.SsyOpCodes)
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{
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GetBlock(ssyOp.GetAbsoluteAddress());
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}
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// Set child blocks. "Branch" is the block the branch instruction
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// points to (when taken), "Next" is the block at the next address,
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// executed when the branch is not taken. For Unconditional Branches
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// or end of program, Next is null.
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OpCode lastOp = currBlock.GetLastOp();
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if (lastOp is OpCodeBranch op)
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{
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currBlock.Branch = GetBlock(op.GetAbsoluteAddress());
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}
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if (!IsUnconditionalBranch(lastOp))
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{
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currBlock.Next = GetBlock(currBlock.EndAddress);
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}
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}
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// Insert the new block on the list (sorted by address).
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if (blocks.Count != 0)
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{
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Block nBlock = blocks[nBlkIndex];
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blocks.Insert(nBlkIndex + (nBlock.Address < currBlock.Address ? 1 : 0), currBlock);
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}
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else
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{
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blocks.Add(currBlock);
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}
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}
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foreach (Block ssyBlock in blocks.Where(x => x.SsyOpCodes.Count != 0))
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{
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for (int ssyIndex = 0; ssyIndex < ssyBlock.SsyOpCodes.Count; ssyIndex++)
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{
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PropagateSsy(visited, ssyBlock, ssyIndex);
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}
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}
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return blocks.ToArray();
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}
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private static bool BinarySearch(List<Block> blocks, ulong address, out int index)
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{
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index = 0;
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int left = 0;
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int right = blocks.Count - 1;
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while (left <= right)
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{
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int size = right - left;
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int middle = left + (size >> 1);
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Block block = blocks[middle];
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index = middle;
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if (address >= block.Address && address < block.EndAddress)
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{
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return true;
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}
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if (address < block.Address)
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{
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right = middle - 1;
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}
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else
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{
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left = middle + 1;
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}
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}
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return false;
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}
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private static void FillBlock(
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Span<byte> code,
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Block block,
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ulong limitAddress,
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ulong startAddress)
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{
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ulong address = block.Address;
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do
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{
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if (address >= limitAddress)
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{
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break;
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}
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// Ignore scheduling instructions, which are written every 32 bytes.
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if (((address - startAddress) & 0x1f) == 0)
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{
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address += 8;
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continue;
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}
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uint word0 = BinaryPrimitives.ReadUInt32LittleEndian(code.Slice((int)address));
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uint word1 = BinaryPrimitives.ReadUInt32LittleEndian(code.Slice((int)address + 4));
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ulong opAddress = address;
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address += 8;
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long opCode = word0 | (long)word1 << 32;
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(InstEmitter emitter, Type opCodeType) = OpCodeTable.GetEmitter(opCode);
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if (emitter == null)
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{
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// TODO: Warning, illegal encoding.
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block.OpCodes.Add(new OpCode(null, opAddress, opCode));
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continue;
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}
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OpCode op = MakeOpCode(opCodeType, emitter, opAddress, opCode);
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block.OpCodes.Add(op);
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}
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while (!IsBranch(block.GetLastOp()));
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block.EndAddress = address;
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block.UpdateSsyOpCodes();
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}
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private static bool IsUnconditionalBranch(OpCode opCode)
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{
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return IsUnconditional(opCode) && IsBranch(opCode);
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}
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private static bool IsUnconditional(OpCode opCode)
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{
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if (opCode is OpCodeExit op && op.Condition != Condition.Always)
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{
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return false;
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}
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return opCode.Predicate.Index == RegisterConsts.PredicateTrueIndex && !opCode.InvertPredicate;
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}
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private static bool IsBranch(OpCode opCode)
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{
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return (opCode is OpCodeBranch opBranch && !opBranch.PushTarget) ||
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opCode is OpCodeSync ||
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opCode is OpCodeExit;
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}
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private static OpCode MakeOpCode(Type type, InstEmitter emitter, ulong address, long opCode)
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{
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if (type == null)
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{
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throw new ArgumentNullException(nameof(type));
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}
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OpActivator createInstance = _opActivators.GetOrAdd(type, CacheOpActivator);
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return (OpCode)createInstance(emitter, address, opCode);
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}
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private static OpActivator CacheOpActivator(Type type)
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{
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Type[] argTypes = new Type[] { typeof(InstEmitter), typeof(ulong), typeof(long) };
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DynamicMethod mthd = new DynamicMethod($"Make{type.Name}", type, argTypes);
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ILGenerator generator = mthd.GetILGenerator();
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generator.Emit(OpCodes.Ldarg_0);
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generator.Emit(OpCodes.Ldarg_1);
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generator.Emit(OpCodes.Ldarg_2);
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generator.Emit(OpCodes.Newobj, type.GetConstructor(argTypes));
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generator.Emit(OpCodes.Ret);
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return (OpActivator)mthd.CreateDelegate(typeof(OpActivator));
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}
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private struct PathBlockState
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{
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public Block Block { get; }
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private enum RestoreType
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{
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None,
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PopSsy,
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PushSync
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}
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private RestoreType _restoreType;
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private ulong _restoreValue;
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public bool ReturningFromVisit => _restoreType != RestoreType.None;
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public PathBlockState(Block block)
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{
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Block = block;
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_restoreType = RestoreType.None;
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_restoreValue = 0;
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}
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public PathBlockState(int oldSsyStackSize)
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{
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Block = null;
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_restoreType = RestoreType.PopSsy;
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_restoreValue = (ulong)oldSsyStackSize;
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}
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public PathBlockState(ulong syncAddress)
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{
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Block = null;
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_restoreType = RestoreType.PushSync;
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_restoreValue = syncAddress;
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}
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public void RestoreStackState(Stack<ulong> ssyStack)
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{
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if (_restoreType == RestoreType.PushSync)
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{
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ssyStack.Push(_restoreValue);
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}
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else if (_restoreType == RestoreType.PopSsy)
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{
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while (ssyStack.Count > (uint)_restoreValue)
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{
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ssyStack.Pop();
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}
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}
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}
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}
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private static void PropagateSsy(Dictionary<ulong, Block> blocks, Block ssyBlock, int ssyIndex)
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{
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OpCodeSsy ssyOp = ssyBlock.SsyOpCodes[ssyIndex];
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Stack<PathBlockState> workQueue = new Stack<PathBlockState>();
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HashSet<Block> visited = new HashSet<Block>();
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Stack<ulong> ssyStack = new Stack<ulong>();
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void Push(PathBlockState pbs)
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{
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if (pbs.Block == null || visited.Add(pbs.Block))
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{
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workQueue.Push(pbs);
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}
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}
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Push(new PathBlockState(ssyBlock));
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while (workQueue.TryPop(out PathBlockState pbs))
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{
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if (pbs.ReturningFromVisit)
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{
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pbs.RestoreStackState(ssyStack);
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continue;
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}
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Block current = pbs.Block;
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int ssyOpCodesCount = current.SsyOpCodes.Count;
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if (ssyOpCodesCount != 0)
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{
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Push(new PathBlockState(ssyStack.Count));
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for (int index = ssyIndex; index < ssyOpCodesCount; index++)
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{
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ssyStack.Push(current.SsyOpCodes[index].GetAbsoluteAddress());
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}
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}
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ssyIndex = 0;
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if (current.Next != null)
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{
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Push(new PathBlockState(current.Next));
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}
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if (current.Branch != null)
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{
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Push(new PathBlockState(current.Branch));
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}
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else if (current.GetLastOp() is OpCodeSync op)
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{
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ulong syncAddress = ssyStack.Pop();
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if (ssyStack.Count == 0)
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{
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ssyStack.Push(syncAddress);
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op.Targets.Add(ssyOp, op.Targets.Count);
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ssyOp.Syncs.TryAdd(op, Local());
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}
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else
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{
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Push(new PathBlockState(syncAddress));
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Push(new PathBlockState(blocks[syncAddress]));
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}
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}
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}
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}
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}
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} |