mirror of
https://github.com/Ryujinx/Ryujinx.git
synced 2024-08-18 14:48:44 +02:00
* Refactor shader GPU state and memory access * Fix NVDEC project build * Address PR feedback and add missing XML comments
433 lines
14 KiB
C#
433 lines
14 KiB
C#
using Ryujinx.Graphics.Shader.Instructions;
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
|
|
using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
|
|
|
|
namespace Ryujinx.Graphics.Shader.Decoders
|
|
{
|
|
static class Decoder
|
|
{
|
|
public static Block[] Decode(IGpuAccessor gpuAccessor, ulong startAddress)
|
|
{
|
|
List<Block> blocks = new List<Block>();
|
|
|
|
Queue<Block> workQueue = new Queue<Block>();
|
|
|
|
Dictionary<ulong, Block> visited = new Dictionary<ulong, Block>();
|
|
|
|
Block GetBlock(ulong blkAddress)
|
|
{
|
|
if (!visited.TryGetValue(blkAddress, out Block block))
|
|
{
|
|
block = new Block(blkAddress);
|
|
|
|
workQueue.Enqueue(block);
|
|
|
|
visited.Add(blkAddress, block);
|
|
}
|
|
|
|
return block;
|
|
}
|
|
|
|
GetBlock(0);
|
|
|
|
while (workQueue.TryDequeue(out Block currBlock))
|
|
{
|
|
// Check if the current block is inside another block.
|
|
if (BinarySearch(blocks, currBlock.Address, out int nBlkIndex))
|
|
{
|
|
Block nBlock = blocks[nBlkIndex];
|
|
|
|
if (nBlock.Address == currBlock.Address)
|
|
{
|
|
throw new InvalidOperationException("Found duplicate block address on the list.");
|
|
}
|
|
|
|
nBlock.Split(currBlock);
|
|
|
|
blocks.Insert(nBlkIndex + 1, currBlock);
|
|
|
|
continue;
|
|
}
|
|
|
|
// If we have a block after the current one, set the limit address.
|
|
ulong limitAddress = ulong.MaxValue;
|
|
|
|
if (nBlkIndex != blocks.Count)
|
|
{
|
|
Block nBlock = blocks[nBlkIndex];
|
|
|
|
int nextIndex = nBlkIndex + 1;
|
|
|
|
if (nBlock.Address < currBlock.Address && nextIndex < blocks.Count)
|
|
{
|
|
limitAddress = blocks[nextIndex].Address;
|
|
}
|
|
else if (nBlock.Address > currBlock.Address)
|
|
{
|
|
limitAddress = blocks[nBlkIndex].Address;
|
|
}
|
|
}
|
|
|
|
FillBlock(gpuAccessor, currBlock, limitAddress, startAddress);
|
|
|
|
if (currBlock.OpCodes.Count != 0)
|
|
{
|
|
// We should have blocks for all possible branch targets,
|
|
// including those from SSY/PBK instructions.
|
|
foreach (OpCodePush pushOp in currBlock.PushOpCodes)
|
|
{
|
|
GetBlock(pushOp.GetAbsoluteAddress());
|
|
}
|
|
|
|
// Set child blocks. "Branch" is the block the branch instruction
|
|
// points to (when taken), "Next" is the block at the next address,
|
|
// executed when the branch is not taken. For Unconditional Branches
|
|
// or end of program, Next is null.
|
|
OpCode lastOp = currBlock.GetLastOp();
|
|
|
|
if (lastOp is OpCodeBranch opBr)
|
|
{
|
|
currBlock.Branch = GetBlock(opBr.GetAbsoluteAddress());
|
|
}
|
|
else if (lastOp is OpCodeBranchIndir opBrIndir)
|
|
{
|
|
// An indirect branch could go anywhere, we don't know the target.
|
|
// Those instructions are usually used on a switch to jump table
|
|
// compiler optimization, and in those cases the possible targets
|
|
// seems to be always right after the BRX itself. We can assume
|
|
// that the possible targets are all the blocks in-between the
|
|
// instruction right after the BRX, and the common target that
|
|
// all the "cases" should eventually jump to, acting as the
|
|
// switch break.
|
|
Block firstTarget = GetBlock(currBlock.EndAddress);
|
|
|
|
firstTarget.BrIndir = opBrIndir;
|
|
|
|
opBrIndir.PossibleTargets.Add(firstTarget);
|
|
}
|
|
|
|
if (!IsUnconditionalBranch(lastOp))
|
|
{
|
|
currBlock.Next = GetBlock(currBlock.EndAddress);
|
|
}
|
|
}
|
|
|
|
// Insert the new block on the list (sorted by address).
|
|
if (blocks.Count != 0)
|
|
{
|
|
Block nBlock = blocks[nBlkIndex];
|
|
|
|
blocks.Insert(nBlkIndex + (nBlock.Address < currBlock.Address ? 1 : 0), currBlock);
|
|
}
|
|
else
|
|
{
|
|
blocks.Add(currBlock);
|
|
}
|
|
|
|
// Do we have a block after the current one?
|
|
if (!IsExit(currBlock.GetLastOp()) && currBlock.BrIndir != null)
|
|
{
|
|
bool targetVisited = visited.ContainsKey(currBlock.EndAddress);
|
|
|
|
Block possibleTarget = GetBlock(currBlock.EndAddress);
|
|
|
|
currBlock.BrIndir.PossibleTargets.Add(possibleTarget);
|
|
|
|
if (!targetVisited)
|
|
{
|
|
possibleTarget.BrIndir = currBlock.BrIndir;
|
|
}
|
|
}
|
|
}
|
|
|
|
foreach (Block block in blocks.Where(x => x.PushOpCodes.Count != 0))
|
|
{
|
|
for (int pushOpIndex = 0; pushOpIndex < block.PushOpCodes.Count; pushOpIndex++)
|
|
{
|
|
PropagatePushOp(visited, block, pushOpIndex);
|
|
}
|
|
}
|
|
|
|
return blocks.ToArray();
|
|
}
|
|
|
|
private static bool BinarySearch(List<Block> blocks, ulong address, out int index)
|
|
{
|
|
index = 0;
|
|
|
|
int left = 0;
|
|
int right = blocks.Count - 1;
|
|
|
|
while (left <= right)
|
|
{
|
|
int size = right - left;
|
|
|
|
int middle = left + (size >> 1);
|
|
|
|
Block block = blocks[middle];
|
|
|
|
index = middle;
|
|
|
|
if (address >= block.Address && address < block.EndAddress)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
if (address < block.Address)
|
|
{
|
|
right = middle - 1;
|
|
}
|
|
else
|
|
{
|
|
left = middle + 1;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
private static void FillBlock(
|
|
IGpuAccessor gpuAccessor,
|
|
Block block,
|
|
ulong limitAddress,
|
|
ulong startAddress)
|
|
{
|
|
ulong address = block.Address;
|
|
|
|
do
|
|
{
|
|
if (address + 7 >= limitAddress)
|
|
{
|
|
break;
|
|
}
|
|
|
|
// Ignore scheduling instructions, which are written every 32 bytes.
|
|
if ((address & 0x1f) == 0)
|
|
{
|
|
address += 8;
|
|
|
|
continue;
|
|
}
|
|
|
|
ulong opAddress = address;
|
|
|
|
address += 8;
|
|
|
|
long opCode = gpuAccessor.MemoryRead<long>(startAddress + opAddress);
|
|
|
|
(InstEmitter emitter, OpCodeTable.OpActivator opActivator) = OpCodeTable.GetEmitter(opCode);
|
|
|
|
if (emitter == null)
|
|
{
|
|
// TODO: Warning, illegal encoding.
|
|
|
|
block.OpCodes.Add(new OpCode(null, opAddress, opCode));
|
|
|
|
continue;
|
|
}
|
|
|
|
if (opActivator == null)
|
|
{
|
|
throw new ArgumentNullException(nameof(opActivator));
|
|
}
|
|
|
|
OpCode op = (OpCode)opActivator(emitter, opAddress, opCode);
|
|
|
|
block.OpCodes.Add(op);
|
|
}
|
|
while (!IsBranch(block.GetLastOp()));
|
|
|
|
block.EndAddress = address;
|
|
|
|
block.UpdatePushOps();
|
|
}
|
|
|
|
private static bool IsUnconditionalBranch(OpCode opCode)
|
|
{
|
|
return IsUnconditional(opCode) && IsBranch(opCode);
|
|
}
|
|
|
|
private static bool IsUnconditional(OpCode opCode)
|
|
{
|
|
if (opCode is OpCodeExit op && op.Condition != Condition.Always)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
return opCode.Predicate.Index == RegisterConsts.PredicateTrueIndex && !opCode.InvertPredicate;
|
|
}
|
|
|
|
private static bool IsBranch(OpCode opCode)
|
|
{
|
|
return (opCode is OpCodeBranch opBranch && !opBranch.PushTarget) ||
|
|
opCode is OpCodeBranchIndir ||
|
|
opCode is OpCodeBranchPop ||
|
|
opCode is OpCodeExit;
|
|
}
|
|
|
|
private static bool IsExit(OpCode opCode)
|
|
{
|
|
return opCode is OpCodeExit;
|
|
}
|
|
|
|
private struct PathBlockState
|
|
{
|
|
public Block Block { get; }
|
|
|
|
private enum RestoreType
|
|
{
|
|
None,
|
|
PopPushOp,
|
|
PushBranchOp
|
|
}
|
|
|
|
private RestoreType _restoreType;
|
|
|
|
private ulong _restoreValue;
|
|
|
|
public bool ReturningFromVisit => _restoreType != RestoreType.None;
|
|
|
|
public PathBlockState(Block block)
|
|
{
|
|
Block = block;
|
|
_restoreType = RestoreType.None;
|
|
_restoreValue = 0;
|
|
}
|
|
|
|
public PathBlockState(int oldStackSize)
|
|
{
|
|
Block = null;
|
|
_restoreType = RestoreType.PopPushOp;
|
|
_restoreValue = (ulong)oldStackSize;
|
|
}
|
|
|
|
public PathBlockState(ulong syncAddress)
|
|
{
|
|
Block = null;
|
|
_restoreType = RestoreType.PushBranchOp;
|
|
_restoreValue = syncAddress;
|
|
}
|
|
|
|
public void RestoreStackState(Stack<ulong> branchStack)
|
|
{
|
|
if (_restoreType == RestoreType.PushBranchOp)
|
|
{
|
|
branchStack.Push(_restoreValue);
|
|
}
|
|
else if (_restoreType == RestoreType.PopPushOp)
|
|
{
|
|
while (branchStack.Count > (uint)_restoreValue)
|
|
{
|
|
branchStack.Pop();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private static void PropagatePushOp(Dictionary<ulong, Block> blocks, Block currBlock, int pushOpIndex)
|
|
{
|
|
OpCodePush pushOp = currBlock.PushOpCodes[pushOpIndex];
|
|
|
|
Stack<PathBlockState> workQueue = new Stack<PathBlockState>();
|
|
|
|
HashSet<Block> visited = new HashSet<Block>();
|
|
|
|
Stack<ulong> branchStack = new Stack<ulong>();
|
|
|
|
void Push(PathBlockState pbs)
|
|
{
|
|
// When block is null, this means we are pushing a restore operation.
|
|
// Restore operations are used to undo the work done inside a block
|
|
// when we return from it, for example it pops addresses pushed by
|
|
// SSY/PBK instructions inside the block, and pushes addresses poped
|
|
// by SYNC/BRK.
|
|
// For blocks, if it's already visited, we just ignore to avoid going
|
|
// around in circles and getting stuck here.
|
|
if (pbs.Block == null || !visited.Contains(pbs.Block))
|
|
{
|
|
workQueue.Push(pbs);
|
|
}
|
|
}
|
|
|
|
Push(new PathBlockState(currBlock));
|
|
|
|
while (workQueue.TryPop(out PathBlockState pbs))
|
|
{
|
|
if (pbs.ReturningFromVisit)
|
|
{
|
|
pbs.RestoreStackState(branchStack);
|
|
|
|
continue;
|
|
}
|
|
|
|
Block current = pbs.Block;
|
|
|
|
// If the block was already processed, we just ignore it, otherwise
|
|
// we would push the same child blocks of an already processed block,
|
|
// and go around in circles until memory is exhausted.
|
|
if (!visited.Add(current))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
int pushOpsCount = current.PushOpCodes.Count;
|
|
|
|
if (pushOpsCount != 0)
|
|
{
|
|
Push(new PathBlockState(branchStack.Count));
|
|
|
|
for (int index = pushOpIndex; index < pushOpsCount; index++)
|
|
{
|
|
branchStack.Push(current.PushOpCodes[index].GetAbsoluteAddress());
|
|
}
|
|
}
|
|
|
|
pushOpIndex = 0;
|
|
|
|
if (current.Next != null)
|
|
{
|
|
Push(new PathBlockState(current.Next));
|
|
}
|
|
|
|
if (current.Branch != null)
|
|
{
|
|
Push(new PathBlockState(current.Branch));
|
|
}
|
|
else if (current.GetLastOp() is OpCodeBranchIndir brIndir)
|
|
{
|
|
// By adding them in descending order (sorted by address), we process the blocks
|
|
// in order (of ascending address), since we work with a LIFO.
|
|
foreach (Block possibleTarget in brIndir.PossibleTargets.OrderByDescending(x => x.Address))
|
|
{
|
|
Push(new PathBlockState(possibleTarget));
|
|
}
|
|
}
|
|
else if (current.GetLastOp() is OpCodeBranchPop op)
|
|
{
|
|
ulong targetAddress = branchStack.Pop();
|
|
|
|
if (branchStack.Count == 0)
|
|
{
|
|
branchStack.Push(targetAddress);
|
|
|
|
op.Targets.Add(pushOp, op.Targets.Count);
|
|
|
|
pushOp.PopOps.TryAdd(op, Local());
|
|
}
|
|
else
|
|
{
|
|
// First we push the target address (this will be used to push the
|
|
// address back into the SSY/PBK stack when we return from that block),
|
|
// then we push the block itself into the work "queue" (well, it's a stack)
|
|
// for processing.
|
|
Push(new PathBlockState(targetAddress));
|
|
Push(new PathBlockState(blocks[targetAddress]));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} |