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158 lines
4.6 KiB
C#
158 lines
4.6 KiB
C#
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using ARMeilleure.IntermediateRepresentation;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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namespace ARMeilleure.Translation
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{
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class ControlFlowGraph
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{
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public BasicBlock Entry { get; }
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public LinkedList<BasicBlock> Blocks { get; }
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public BasicBlock[] PostOrderBlocks { get; }
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public int[] PostOrderMap { get; }
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public ControlFlowGraph(BasicBlock entry, LinkedList<BasicBlock> blocks)
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{
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Entry = entry;
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Blocks = blocks;
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RemoveUnreachableBlocks(blocks);
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HashSet<BasicBlock> visited = new HashSet<BasicBlock>();
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Stack<BasicBlock> blockStack = new Stack<BasicBlock>();
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PostOrderBlocks = new BasicBlock[blocks.Count];
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PostOrderMap = new int[blocks.Count];
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visited.Add(entry);
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blockStack.Push(entry);
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int index = 0;
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while (blockStack.TryPop(out BasicBlock block))
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{
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if (block.Next != null && visited.Add(block.Next))
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{
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blockStack.Push(block);
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blockStack.Push(block.Next);
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}
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else if (block.Branch != null && visited.Add(block.Branch))
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{
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blockStack.Push(block);
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blockStack.Push(block.Branch);
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}
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else
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{
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PostOrderMap[block.Index] = index;
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PostOrderBlocks[index++] = block;
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}
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}
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}
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private void RemoveUnreachableBlocks(LinkedList<BasicBlock> blocks)
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{
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HashSet<BasicBlock> visited = new HashSet<BasicBlock>();
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Queue<BasicBlock> workQueue = new Queue<BasicBlock>();
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visited.Add(Entry);
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workQueue.Enqueue(Entry);
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while (workQueue.TryDequeue(out BasicBlock block))
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{
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Debug.Assert(block.Index != -1, "Invalid block index.");
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if (block.Next != null && visited.Add(block.Next))
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{
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workQueue.Enqueue(block.Next);
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}
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if (block.Branch != null && visited.Add(block.Branch))
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{
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workQueue.Enqueue(block.Branch);
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}
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}
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if (visited.Count < blocks.Count)
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{
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// Remove unreachable blocks and renumber.
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int index = 0;
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for (LinkedListNode<BasicBlock> node = blocks.First; node != null;)
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{
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LinkedListNode<BasicBlock> nextNode = node.Next;
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BasicBlock block = node.Value;
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if (!visited.Contains(block))
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{
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block.Next = null;
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block.Branch = null;
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blocks.Remove(node);
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}
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else
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{
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block.Index = index++;
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}
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node = nextNode;
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}
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}
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}
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public BasicBlock SplitEdge(BasicBlock predecessor, BasicBlock successor)
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{
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BasicBlock splitBlock = new BasicBlock(Blocks.Count);
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if (predecessor.Next == successor)
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{
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predecessor.Next = splitBlock;
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}
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if (predecessor.Branch == successor)
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{
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predecessor.Branch = splitBlock;
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}
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if (splitBlock.Predecessors.Count == 0)
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{
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throw new ArgumentException("Predecessor and successor are not connected.");
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}
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// Insert the new block on the list of blocks.
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BasicBlock succPrev = successor.Node.Previous?.Value;
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if (succPrev != null && succPrev != predecessor && succPrev.Next == successor)
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{
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// Can't insert after the predecessor or before the successor.
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// Here, we insert it before the successor by also spliting another
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// edge (the one between the block before "successor" and "successor").
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BasicBlock splitBlock2 = new BasicBlock(splitBlock.Index + 1);
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succPrev.Next = splitBlock2;
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splitBlock2.Branch = successor;
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splitBlock2.Operations.AddLast(new Operation(Instruction.Branch, null));
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Blocks.AddBefore(successor.Node, splitBlock2);
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}
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splitBlock.Next = successor;
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Blocks.AddBefore(successor.Node, splitBlock);
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return splitBlock;
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}
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}
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}
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