public void RemoveCaller(DecodedFunction caller)
{
if (_callers.Remove(caller) && _callers.Count == 0)
{
Type = FunctionType.Unused;
}
}
public static DecodedProgram Decode(ShaderConfig config, ulong startAddress)
{
Queue <DecodedFunction> functionsQueue = new Queue <DecodedFunction>();
Dictionary <ulong, DecodedFunction> functionsVisited = new Dictionary <ulong, DecodedFunction>();
DecodedFunction EnqueueFunction(ulong address)
{
if (!functionsVisited.TryGetValue(address, out DecodedFunction function))
{
functionsVisited.Add(address, function = new DecodedFunction(address));
functionsQueue.Enqueue(function);
}
return(function);
}
DecodedFunction mainFunction = EnqueueFunction(0);
while (functionsQueue.TryDequeue(out DecodedFunction currentFunction))
{
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(currentFunction.Address);
bool hasNewTarget;
do
{
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(config, currBlock, limitAddress, startAddress);
if (currBlock.OpCodes.Count != 0)
{
// We should have blocks for all possible branch targets,
// including those from SSY/PBK instructions.
foreach (PushOpInfo pushOp in currBlock.PushOpCodes)
{
GetBlock(pushOp.Op.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.
InstOp lastOp = currBlock.GetLastOp();
if (lastOp.Name == InstName.Cal)
{
EnqueueFunction(lastOp.GetAbsoluteAddress()).AddCaller(currentFunction);
}
else if (lastOp.Name == InstName.Bra)
{
Block succBlock = GetBlock(lastOp.GetAbsoluteAddress());
currBlock.Successors.Add(succBlock);
succBlock.Predecessors.Add(currBlock);
}
if (!IsUnconditionalBranch(ref lastOp))
{
Block succBlock = GetBlock(currBlock.EndAddress);
currBlock.Successors.Insert(0, succBlock);
succBlock.Predecessors.Add(currBlock);
}
}
// 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);
}
}
// Propagate SSY/PBK addresses into their uses (SYNC/BRK).
foreach (Block block in blocks.Where(x => x.PushOpCodes.Count != 0))
{
for (int pushOpIndex = 0; pushOpIndex < block.PushOpCodes.Count; pushOpIndex++)
{
PropagatePushOp(visited, block, pushOpIndex);
}
}
// Try to find targets for BRX (indirect branch) instructions.
hasNewTarget = FindBrxTargets(config, blocks, GetBlock);
// If we discovered new branch targets from the BRX instruction,
// we need another round of decoding to decode the new blocks.
// Additionally, we may have more SSY/PBK targets to propagate,
// and new BRX instructions.
}while (hasNewTarget);
currentFunction.SetBlocks(blocks.ToArray());
}
return(new DecodedProgram(mainFunction, functionsVisited));
}
public void AddCaller(DecodedFunction caller)
{
_callers.Add(caller);
}