/// <summary>
/// Get the jump target of the branch instruction at index i.
/// The resulting InstructionRange will have length 0.
/// Use Extend or ExtendBackwards to give it a size.
/// The length being 0, ExtendBackwards won't include the instruction being pointed at.
/// </summary>
public InstructionRange Follow(int i)
{
var op = insts[start + i].operand;
if (op == null || !(op is Label))
{
throw new Exception("Expected a branch instruction, got: " + insts[start + i]);
}
Label lbl = (Label)op;
int pos = insts.FindIndex(inst => inst.labels.Contains(lbl));
if (pos < 0)
{
throw new Exception($"Label not found: LBL_{lbl.GetHashCode()}");
}
var res = new InstructionRange(insts, pos, 0);
// Hack.Log($"Jump points to {pos}:");
return(res);
}
public void ExtendBackwards(InstructionRange ext)
{
length = start + length - ext.start;
start = ext.start;
}
public void Extend(InstructionRange ext)
{
length = ext.start + ext.length - start;
}
