public static FlowBranching CreateBranching (FlowBranching parent, BranchingType type, Block block, Location loc)
{
switch (type) {
case BranchingType.Exception:
case BranchingType.Labeled:
case BranchingType.Toplevel:
case BranchingType.TryCatch:
throw new InvalidOperationException ();
case BranchingType.Switch:
return new FlowBranchingBreakable (parent, type, SiblingType.SwitchSection, block, loc);
case BranchingType.Block:
return new FlowBranchingBlock (parent, type, SiblingType.Block, block, loc);
case BranchingType.Loop:
return new FlowBranchingBreakable (parent, type, SiblingType.Conditional, block, loc);
case BranchingType.Embedded:
return new FlowBranchingContinuable (parent, type, SiblingType.Conditional, block, loc);
default:
return new FlowBranchingBlock (parent, type, SiblingType.Conditional, block, loc);
}
}
// <summary>
// Creates a new flow branching which is contained in `parent'.
// You should only pass non-null for the `block' argument if this block
// introduces any new variables - in this case, we need to create a new
// usage vector with a different size than our parent's one.
// </summary>
protected FlowBranching(FlowBranching parent, BranchingType type, SiblingType stype,
Block block, Location loc)
{
Parent = parent;
Block = block;
Location = loc;
Type = type;
id = ++next_id;
UsageVector vector;
if (Block != null) {
UsageVector parent_vector = parent != null ? parent.CurrentUsageVector : null;
vector = new UsageVector (stype, parent_vector, Block, loc, Block.AssignableSlots);
} else {
vector = new UsageVector (stype, Parent.CurrentUsageVector, null, loc);
}
AddSibling (vector);
}
public FlowBranchingContinuable (FlowBranching parent, BranchingType type, SiblingType stype, Block block, Location loc)
: base (parent, type, stype, block, loc)
{ }