BasicBlock[] IDominanceProvider.GetDominators(BasicBlock block)
{
if (block == null)
throw new ArgumentNullException(@"block");
Debug.Assert(block.Sequence < _doms.Length, @"Invalid block index.");
if (block.Sequence >= _doms.Length)
throw new ArgumentException(@"Invalid block index.", @"block");
// Return value
BasicBlock[] result;
// Counter
int count, idx = block.Sequence;
// Count the dominators first
for (count = 1; 0 != idx; count++)
idx = _doms[idx].Sequence;
// Allocate a dominator array
result = new BasicBlock[count + 1];
result[0] = block;
for (idx = block.Sequence, count = 1; 0 != idx; idx = _doms[idx].Sequence)
result[count++] = _doms[idx];
result[count] = _doms[0];
return result;
}
/// <summary>
/// Performs stage specific processing on the compiler context.
/// </summary>
public void Run()
{
// Create the prologue block
Context ctx = new Context(InstructionSet, -1);
// Add a jump instruction to the first block from the prologue
ctx.AppendInstruction(IR.Instruction.JmpInstruction);
//ctx.AppendInstruction(CIL.Instruction.Get(CIL.OpCode.Br));
ctx.SetBranch(0);
ctx.Label = -1;
_prologue = CreateBlock(-1, ctx.Index);
SplitIntoBlocks(0);
// Create the epilogue block
ctx = new Context(InstructionSet, -1);
// Add null instruction, necessary to generate a block index
ctx.AppendInstruction(null);
ctx.Ignore = true;
ctx.Label = Int32.MaxValue;
_epilogue = CreateBlock(Int32.MaxValue, ctx.Index);
// Link all the blocks together
BuildBlockLinks(_prologue);
// Link Exception Header Clauses
LinkExceptionHeaderClauses();
}
/// <summary>
/// Creates the block.
/// </summary>
/// <param name="label">The label.</param>
/// <param name="index">The index.</param>
/// <returns></returns>
protected BasicBlock CreateBlock(int label, int index)
{
// HACK: BasicBlock.Count for the sequence works for now since blocks are not removed
BasicBlock basicBlock = new BasicBlock (BasicBlocks.Count, label, index);
BasicBlocks.Add (basicBlock);
return basicBlock;
}
BasicBlock[] IDominanceProvider.GetDominanceFrontierOfBlock(BasicBlock block)
{
if (block == null)
throw new ArgumentNullException(@"block");
return _domFrontierOfBlock[block.Sequence];
}
/// <summary>
/// Nexts the block has initial stack.
/// </summary>
/// <param name="block">The block.</param>
/// <param name="nextBlock">The next block.</param>
/// <returns></returns>
private static bool NextBlockHasInitialStack(BasicBlock block, out BasicBlock nextBlock)
{
nextBlock = null;
foreach (BasicBlock b in block.NextBlocks)
{
if (b.InitialStack == null)
continue;
nextBlock = b;
return true;
}
return false;
}
/// <summary>
/// Initializes a new instance of the <see cref="Context"/> class.
/// </summary>
/// <param name="instructionSet">The instruction set.</param>
/// <param name="basicBlock">The basic block.</param>
public Context(InstructionSet instructionSet, BasicBlock basicBlock)
{
_instructionSet = instructionSet;
_index = basicBlock.Index;
_block = basicBlock;
}
/// <summary>
/// Sets the instruction.
/// </summary>
/// <param name="instruction">The instruction.</param>
/// <param name="block">The block.</param>
public void SetInstruction(IInstruction instruction, BasicBlock block)
{
SetInstruction(instruction);
SetBranch(block);
}
/// <summary>
/// Builds the block links.
/// </summary>
/// <param name="block">The current block.</param>
private void BuildBlockLinks(BasicBlock block)
{
for (Context ctx = CreateContext(block); !ctx.EndOfInstruction; ctx.GotoNext())
{
switch (ctx.Instruction.FlowControl)
{
case FlowControl.Next: continue;
case FlowControl.Call: continue;
case FlowControl.Return:
if (!block.NextBlocks.Contains(_epilogue))
LinkBlocks(block, _epilogue);
return;
case FlowControl.Break: goto case FlowControl.Branch;
case FlowControl.Throw: goto case FlowControl.Branch;
case FlowControl.Switch: goto case FlowControl.ConditionalBranch;
case FlowControl.Branch:
{
FindAndLinkBlock(block, ctx.Branch.Targets[0]);
return;
}
case FlowControl.ConditionalBranch:
foreach (int target in ctx.Branch.Targets) {
FindAndLinkBlock(block, target);
}
// Conditional blocks are at least two way branches. The old way of adding jumps didn't properly
// resolve operands under certain circumstances. This does.
int nextIndex = ctx.Index + 1;
if (nextIndex < this.InstructionSet.Used)
{
FindAndLinkBlock(block, this.InstructionSet.Data[nextIndex].Label);
}
continue;
default:
Debug.Assert(false);
break;
}
}
}
private void FindAndLinkBlock(BasicBlock block, int target)
{
BasicBlock next = this.FindBlock(target);
if (!block.NextBlocks.Contains(next)) {
this.LinkBlocks(block, next);
this.BuildBlockLinks(next);
}
}
/// <summary>
/// Completion of code generation for a block.
/// </summary>
/// <param name="block">The completed block.</param>
protected virtual void BlockEnd(BasicBlock block)
{
}
/// <summary>
/// Creates the temporary moves.
/// </summary>
/// <param name="ctx">The CTX.</param>
/// <param name="block">The block.</param>
/// <param name="stack">The stack.</param>
private void CreateTemporaryMoves(Context ctx, BasicBlock block, Stack<Operand> stack)
{
Context context = ctx.InsertBefore();
context.SetInstruction(IR.Instruction.NopInstruction);
BasicBlock nextBlock;
if (NextBlockHasInitialStack(block, out nextBlock))
LinkTemporaryMoves(context, block, nextBlock, stack);
else
CreateNewTemporaryMoves(context, block, stack);
}
/// <summary>
/// Inserts the instruction after.
/// </summary>
/// <param name="instruction">The instruction.</param>
/// <param name="block">The block.</param>
public void AppendInstruction(IInstruction instruction, BasicBlock block)
{
AppendInstruction();
SetInstruction(instruction, block);
}
/// <summary>
/// Determines the loop depths.
/// </summary>
private void DetermineLoopDepths()
{
// Create queue for first iteration
Queue <ConnectedBlocks> queue = new Queue <ConnectedBlocks>();
queue.Enqueue(new ConnectedBlocks(null, _first));
// Flag per basic block
Dictionary <BasicBlock, int> visited = new Dictionary <BasicBlock, int>(BasicBlocks.Count);
Dictionary <BasicBlock, int> active = new Dictionary <BasicBlock, int>(BasicBlocks.Count);
// Create dictionary for loop _header index assignments
Dictionary <BasicBlock, int> loopHeaderIndexes = new Dictionary <BasicBlock, int>();
while (queue.Count != 0)
{
ConnectedBlocks at = queue.Dequeue();
if (active.ContainsKey(at.to))
{
// Found a loop -
// the loop-_header block is in at.to
// and the loop-end is in at.From
// Add loop-end to list
_loops.Add(at);
// Assign unique loop index (if not already set)
if (!loopHeaderIndexes.ContainsKey(at.to))
{
loopHeaderIndexes.Add(at.to, loopHeaderIndexes.Count);
}
// and continue iteration
continue;
}
// Mark as active
active.Add(at.to, 0);
// Mark as visited
visited.Add(at.to, 0);
// Add successors to queue
foreach (BasicBlock successor in at.to.NextBlocks)
{
queue.Enqueue(new ConnectedBlocks(at.to, successor));
}
}
// Create two-dimensional bit set of blocks belonging to loops
//BitArray bitSet = new BitArray(loopHeaderIndexes.Count * BasicBlocks.Count, false);
Dictionary <BasicBlock, List <BasicBlock> > count = new Dictionary <BasicBlock, List <BasicBlock> >();
// Create stack of Blocks for next step of iterations
Stack <BasicBlock> stack = new Stack <BasicBlock>();
// Second set of iterations
foreach (ConnectedBlocks loop in _loops)
{
// Add loop-tail to list
List <BasicBlock> current;
if (!count.ContainsKey(loop.to))
{
current = new List <BasicBlock>();
current.Add(loop.to);
count.Add(loop.to, current);
}
else
{
current = count[loop.to];
if (!current.Contains(loop.to))
{
current.Add(loop.to);
}
}
//Console.WriteLine(index.ToString() + " : B" + loop.to.Index.ToString());
// Add loop-end to stack
stack.Push(loop.From);
// Clear visit flag
visited = new Dictionary <BasicBlock, int>(BasicBlocks.Count);
while (stack.Count != 0)
{
BasicBlock at = stack.Pop();
// Already visited, continue loop
if (visited.ContainsKey(at))
{
continue;
}
// Mark as visisted
if (!visited.ContainsKey(at))
{
visited.Add(at, 0);
}
// Add predecessor to list (needed for count)
if (!current.Contains(at))
{
current.Add(at);
}
//Console.WriteLine(index.ToString() + " : B" + at.Index.ToString());
// Add predecessors to queue
foreach (BasicBlock predecessor in at.PreviousBlocks)
{
if (predecessor != loop.to) // Exclude if Loop-Header
{
stack.Push(predecessor);
}
}
}
}
// Last step, assign LoopIndex and LoopDepth to each basic block
foreach (BasicBlock block in BasicBlocks)
{
if (count.ContainsKey(block))
{
_depths.Add(block, count[block].Count);
}
else
{
_depths.Add(block, 0);
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ConnectedBlocks"/> struct.
/// </summary>
/// <param name="from">From block.</param>
/// <param name="to">To block.</param>
public ConnectedBlocks(BasicBlock from, BasicBlock to)
{
this.to = to;
this.From = from;
}
/// <summary>
/// Sets the branch.
/// </summary>
/// <param name="block">The block.</param>
public void SetBranch(BasicBlock block)
{
SetBranch(block.Label);
}
/// <summary>
/// Inserts the instruction after.
/// </summary>
/// <param name="instruction">The instruction.</param>
/// <param name="code">The code.</param>
/// <param name="block">The block.</param>
/// <param name="branchHint">if set to <c>true</c> [branch hint].</param>
public void AppendInstruction(IInstruction instruction, IR.ConditionCode code, BasicBlock block, bool branchHint)
{
AppendInstruction(instruction, code, block);
BranchHint = branchHint;
}
/// <summary>
/// Inserts the instruction after.
/// </summary>
/// <param name="instruction">The instruction.</param>
/// <param name="code">The code.</param>
/// <param name="block">The block.</param>
public void AppendInstruction(IInstruction instruction, IR.ConditionCode code, BasicBlock block)
{
AppendInstruction();
SetInstruction(instruction, code, block);
}
/// <summary>
/// Sets the instruction.
/// </summary>
/// <param name="instruction">The instruction.</param>
/// <param name="code">The code.</param>
/// <param name="block">The block.</param>
public void SetInstruction(IInstruction instruction, IR.ConditionCode code, BasicBlock block)
{
SetInstruction(instruction);
ConditionCode = code;
SetBranch(block);
}
/// <summary>
/// Links the temporary moves.
/// </summary>
/// <param name="ctx">The CTX.</param>
/// <param name="block">The block.</param>
/// <param name="nextBlock">The next block.</param>
/// <param name="stack">The stack.</param>
private void LinkTemporaryMoves(Context ctx, BasicBlock block, BasicBlock nextBlock, Stack<Operand> stack)
{
Stack<Operand> initialStack = GetCurrentStack(stack);
Stack<Operand> nextInitialStack = GetCurrentStack(nextBlock.InitialStack);
for (int i = 0; i < nextBlock.InitialStack.Count; ++i)
ctx.AppendInstruction(IR.Instruction.MoveInstruction, nextInitialStack.Pop(), initialStack.Pop());
if (nextBlock.InitialStack.Count > 0)
foreach (BasicBlock nBlock in block.NextBlocks)
nBlock.InitialStack = GetCurrentStack(nextBlock.InitialStack);
}
/// <summary>
/// Initializes a new instance of the <see cref="Context"/> class.
/// </summary>
/// <param name="instructionSet">The instruction set.</param>
/// <param name="index">The index.</param>
public Context(InstructionSet instructionSet, int index)
{
_instructionSet = instructionSet;
_index = index;
_block = null;
}
/// <summary>
/// Sets the instruction.
/// </summary>
/// <param name="instruction">The instruction.</param>
/// <param name="code">The code.</param>
/// <param name="block">The block.</param>
public void SetInstruction(IInstruction instruction, IR.ConditionCode code, BasicBlock block)
{
SetInstruction(instruction);
ConditionCode = code;
SetBranch(block);
}
/// <summary>
/// Determines whether [is not processed] [the specified block].
/// </summary>
/// <param name="block">The block.</param>
/// <returns>
/// <c>true</c> if [is not processed] [the specified block]; otherwise, <c>false</c>.
/// </returns>
private bool IsNotProcessed(BasicBlock block)
{
return !_processed.Contains(block);
}
BasicBlock IDominanceProvider.GetImmediateDominator(BasicBlock block)
{
if (block == null)
throw new ArgumentNullException(@"block");
Debug.Assert(block.Sequence < _doms.Length, @"Invalid block index.");
if (block.Sequence >= _doms.Length)
throw new ArgumentException(@"Invalid block index.", @"block");
return _doms[block.Sequence];
}
/// <summary>
/// Marks as processed.
/// </summary>
/// <param name="block">The block.</param>
private void MarkAsProcessed(BasicBlock block)
{
if (_processed.Contains(block))
return;
_processed.Add(block);
}
/// <summary>
/// Retrieves the highest common immediate dominator of the two given Blocks.
/// </summary>
/// <param name="b1">The first basic block.</param>
/// <param name="b2">The second basic block.</param>
/// <returns>The highest common dominator.</returns>
private BasicBlock Intersect(BasicBlock b1, BasicBlock b2)
{
BasicBlock f1 = b1, f2 = b2;
while (f2 != null && f1 != null && f1.Sequence != f2.Sequence)
{
while (f1 != null && f1.Sequence > f2.Sequence)
f1 = _doms[f1.Sequence];
while (f2 != null && f1 != null && f2.Sequence > f1.Sequence)
f2 = _doms[f2.Sequence];
}
return f1;
}
/// <summary>
/// Start of code generation for a block.
/// </summary>
/// <param name="block">The started block.</param>
protected virtual void BlockStart(BasicBlock block)
{
_codeEmitter.Label(block.Label);
}
private BasicBlock[] ReversePostorder(List<BasicBlock> blocks)
{
BasicBlock[] result = new BasicBlock[blocks.Count - 1];
int idx = 0;
Queue<BasicBlock> workList = new Queue<BasicBlock>(blocks.Count);
// Add next blocks
foreach (BasicBlock next in blocks[0].NextBlocks)
workList.Enqueue(next);
while (workList.Count != 0)
{
BasicBlock current = workList.Dequeue();
if (Array.IndexOf(result, current) == -1)
{
result[idx++] = current;
foreach (BasicBlock next in current.NextBlocks)
workList.Enqueue(next);
}
}
return result;
}
/// <summary>
/// Spills all active operands at the end of a basic block.
/// </summary>
/// <param name="block">The basic block to spill in.</param>
private void SpillActiveOperands(BasicBlock block)
{
int regIdx = 0;
foreach (Operand op in _activeOperands) {
if (op != null && op is MemoryOperand) {
Context ctx = new Context(InstructionSet, block);
ctx.GotoLast();
InsertMove(ctx, op, new RegisterOperand(op.Type, _registerSet[regIdx]));
}
regIdx++;
}
Array.Clear(_activeOperands, 0, _activeOperands.Length);
}
/// <summary>
/// Inserts the instruction after.
/// </summary>
/// <param name="instruction">The instruction.</param>
/// <param name="code">The code.</param>
/// <param name="block">The block.</param>
public void AppendInstruction(IInstruction instruction, IR.ConditionCode code, BasicBlock block)
{
AppendInstruction();
SetInstruction(instruction, code, block);
}
/// <summary>
/// Links the Blocks.
/// </summary>
/// <param name="caller">The caller.</param>
/// <param name="callee">The callee.</param>
private void LinkBlocks(BasicBlock caller, BasicBlock callee)
{
// Chain the blocks together
caller.NextBlocks.Add(callee);
callee.PreviousBlocks.Add(caller);
}
/// <summary>
/// Initializes a new instance of the <see cref="Context"/> class.
/// </summary>
/// <param name="instructionSet">The instruction set.</param>
/// <param name="index">The index.</param>
public Context(InstructionSet instructionSet, int index)
{
_instructionSet = instructionSet;
_index = index;
_block = null;
}
/// <summary>
/// Inserts the instruction after.
/// </summary>
/// <param name="instruction">The instruction.</param>
/// <param name="block">The block.</param>
public void AppendInstruction(IInstruction instruction, BasicBlock block)
{
AppendInstruction();
SetInstruction(instruction, block);
}
/// <summary>
/// Initializes a new instance of the <see cref="Context"/> class.
/// </summary>
/// <param name="instructionSet">The instruction set.</param>
/// <param name="basicBlock">The basic block.</param>
public Context(InstructionSet instructionSet, BasicBlock basicBlock)
{
_instructionSet = instructionSet;
_index = basicBlock.Index;
_block = basicBlock;
}
/// <summary>
/// Initializes a new instance of the <see cref="Context"/> class.
/// </summary>
/// <param name="instructionSet">The instruction set.</param>
/// <param name="block">The block.</param>
/// <param name="index">The index.</param>
public Context(InstructionSet instructionSet, BasicBlock block, int index)
{
_instructionSet = instructionSet;
_index = index;
_block = block;
}
/// <summary>
/// Runs the specified compiler.
/// </summary>
public void Run()
{
if (!methodCount.ContainsKey(MethodCompiler.Method.Name))
methodCount[MethodCompiler.Method.Name] = 0;
++methodCount[MethodCompiler.Method.Name];
// Retreive the first block
firstBlock = FindBlock(-1);
workList = new Stack<BasicBlock>();
workList.Push(firstBlock);
workArray = new BitArray(BasicBlocks.Count);
string methodName = MethodCompiler.Method.Name;
methodName = methodName.Replace("<", "");
methodName = methodName.Replace(">", "");
methodName = methodName.Replace("$", "");
methodName = methodName.Replace(".", "");
IPipelineStage previousStage = MethodCompiler.GetPreviousStage(typeof(IMethodCompilerStage));
dotFile.WriteLine("subgraph cluster" + methodName + "_FlowGraph {");
dotFile.WriteLine("label = \"Method: " + methodName + "(" + MethodCompiler.Method.Signature + ") after " + previousStage.Name + "\"");
//dotFile.WriteLine("graph [rankdir = \"TB\"];");
string nodes = string.Empty;
string edges = string.Empty;
foreach (BasicBlock block in BasicBlocks)
{
string nodeName = string.Empty;
string nodeContent = string.Empty;
string nextNode = string.Empty;
nodeName = methodName + "_" + block.ToString();
//nodeName = nodeName.Replace("-", "_");
nodeContent += "<tr><td bgcolor=\"black\" align=\"center\" colspan=\"4\"><font face=\"Courier\" color=\"white\">L_" + block.Label.ToString("x4") + "</font></td></tr>";
int field = 0;
int i = 0;
for (Context ctx = new Context(InstructionSet, block); !ctx.EndOfInstruction; ctx.GotoNext())
{
if (ctx.Instruction == null)
continue;
string color;
string inst = ctx.Instruction.ToString(ctx).Replace("&", "&");
inst = inst.Replace("<", "<");
inst = inst.Replace(">", ">");
if (inst.StartsWith("IL") || inst.StartsWith("T_"))
color = "#0000ff5f";
else if (inst.StartsWith("IR"))
color = "#ff00005f";
else
color = "#CFD6CEff";
nodeContent += "<tr height=\"20\"><td bgcolor=\"white\" align=\"right\" width=\"20\"><img src=\"icon.png\"/></td><td bgcolor=\"white\" align=\"right\">" + (i++) + "</td><td bgcolor=\"" + color + "\" align=\"center\" colspan=\"2\"><font face=\"Courier\">" + inst + "</font></td></tr>";
++field;
}
if (nodeContent != string.Empty && nodeContent[nodeContent.Length - 1] == '|')
nodeContent = nodeContent.Substring(0, nodeContent.Length - 2);
if (nodeContent != string.Empty)
nodes += "\"" + nodeName + "\" [label = <<table border=\"1\" cellborder=\"0\" cellpadding=\"3\" bgcolor=\"white\">" + nodeContent + "</table>> shape = \"Mrecord\"];\r\n";
foreach (BasicBlock nextBlock in block.NextBlocks)
{
nextNode = methodName + "_" + nextBlock.ToString();
edges += "\"" + nodeName + "\"" + " -> " + "\"" + nextNode + "\";\r\n";
}
}
dotFile.WriteLine(nodes);
dotFile.WriteLine(edges);
dotFile.WriteLine("};");
}
/// <summary>
/// Sets the branch.
/// </summary>
/// <param name="block">The block.</param>
public void SetBranch(BasicBlock block)
{
SetBranch(block.Label);
}
/// <summary>
/// Assigns the operands.
/// </summary>
/// <param name="block">The block.</param>
private void AssignOperands(BasicBlock block)
{
if (block.InitialStack != null)
foreach (Operand operand in block.InitialStack)
_operandStack.Push(operand);
for (Context ctx = new Context(InstructionSet, block); !ctx.EndOfInstruction; ctx.GotoNext())
{
if (!(ctx.Instruction is IBranchInstruction) && !(ctx.Instruction is ICILInstruction))
continue;
if (!(ctx.Instruction is IR.JmpInstruction))
{
AssignOperandsFromCILStack(ctx, _operandStack);
(ctx.Instruction as ICILInstruction).Validate(ctx, MethodCompiler);
PushResultOperands(ctx, _operandStack);
}
if (ctx.Instruction is IBranchInstruction)
{
Stack<Operand> initialStack = GetCurrentStack(_operandStack);
CreateTemporaryMoves(ctx, block, initialStack);
break;
}
}
MarkAsProcessed(block);
foreach (BasicBlock b in block.NextBlocks)
{
if (IsNotProcessed(b))
AssignOperands(b);
}
}
/// <summary>
/// Sets the instruction.
/// </summary>
/// <param name="instruction">The instruction.</param>
/// <param name="block">The block.</param>
public void SetInstruction(IInstruction instruction, BasicBlock block)
{
SetInstruction(instruction);
SetBranch(block);
}
/// <summary>
/// Creates the new temporary moves.
/// </summary>
/// <param name="ctx">The CTX.</param>
/// <param name="block">The block.</param>
/// <param name="stack">The stack.</param>
private void CreateNewTemporaryMoves(Context ctx, BasicBlock block, Stack<Operand> stack)
{
Stack<Operand> nextStack = new Stack<Operand>();
foreach (Operand operand in stack)
{
Operand temp = MethodCompiler.CreateTemporary(operand.Type);
nextStack.Push(temp);
_operandStack.Pop();
ctx.AppendInstruction(IR.Instruction.MoveInstruction, temp, operand);
}
if (nextStack.Count > 0)
foreach (BasicBlock nextBlock in block.NextBlocks)
nextBlock.InitialStack = GetCurrentStack(nextStack);
}
/// <summary>
/// Sets the instruction.
/// </summary>
/// <param name="instruction">The instruction.</param>
/// <param name="code">The code.</param>
/// <param name="block">The block.</param>
/// <param name="branchHint">if set to <c>true</c> [branch hint].</param>
public void SetInstruction(IInstruction instruction, IR.ConditionCode code, BasicBlock block, bool branchHint)
{
SetInstruction(instruction, code, block);
BranchHint = branchHint;
}
/// <summary>
/// Initializes a new instance of the <see cref="Context"/> class.
/// </summary>
/// <param name="instructionSet">The instruction set.</param>
/// <param name="block">The block.</param>
/// <param name="index">The index.</param>
public Context(InstructionSet instructionSet, BasicBlock block, int index)
{
_instructionSet = instructionSet;
_index = index;
_block = block;
}
