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* Relax block ordering constraints Before `block.Next` had to follow `block.ListNext`, now it does not. Instead `CodeGenerator` will now emit the necessary jump instructions to ensure control flow. This makes control flow and block order modifications easier. It also eliminates some simple cases of redundant branches. * Set PPTC version
100 lines
2.6 KiB
C#
100 lines
2.6 KiB
C#
using System;
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using System.Collections.Generic;
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namespace ARMeilleure.IntermediateRepresentation
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{
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class BasicBlock : IIntrusiveListNode<BasicBlock>
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{
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private readonly List<BasicBlock> _successors = new List<BasicBlock>();
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public int Index { get; set; }
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public BasicBlock ListPrevious { get; set; }
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public BasicBlock ListNext { get; set; }
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public IntrusiveList<Node> Operations { get; }
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public List<BasicBlock> Predecessors { get; }
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public HashSet<BasicBlock> DominanceFrontiers { get; }
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public BasicBlock ImmediateDominator { get; set; }
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public int SuccessorCount => _successors.Count;
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public BasicBlock() : this(index: -1) { }
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public BasicBlock(int index)
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{
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Operations = new IntrusiveList<Node>();
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Predecessors = new List<BasicBlock>();
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DominanceFrontiers = new HashSet<BasicBlock>();
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Index = index;
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}
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public void AddSuccessor(BasicBlock block)
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{
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if (block == null)
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{
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throw new ArgumentNullException(nameof(block));
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}
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block.Predecessors.Add(this);
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_successors.Add(block);
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}
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public void RemoveSuccessor(int index)
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{
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BasicBlock oldBlock = _successors[index];
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oldBlock.Predecessors.Remove(this);
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_successors.RemoveAt(index);
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}
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public BasicBlock GetSuccessor(int index)
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{
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return _successors[index];
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}
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public void SetSuccessor(int index, BasicBlock block)
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{
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if (block == null)
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{
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throw new ArgumentNullException(nameof(block));
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}
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BasicBlock oldBlock = _successors[index];
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oldBlock.Predecessors.Remove(this);
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block.Predecessors.Add(this);
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_successors[index] = block;
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}
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public void Append(Node node)
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{
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var lastOp = Operations.Last as Operation;
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// Append node before terminal or to end if no terminal.
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switch (lastOp?.Instruction)
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{
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case Instruction.Return:
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case Instruction.Tailcall:
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case Instruction.BranchIf:
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Operations.AddBefore(lastOp, node);
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break;
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default:
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Operations.AddLast(node);
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break;
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}
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}
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public Node GetLastOp()
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{
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return Operations.Last;
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}
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}
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} |