public PopTreeList Build(ICollection instructions)
{
foreach (Instruction i in instructions)
{
PopTree p = new PopTree(i);
int pops = InstructionInfo.Pops(i, _machineStack.Count);
if (pops > _machineStack.Count)
{
// can happen with exception blocks whose support is flaky.
//Console.WriteLine("Attempting to pop more than machine has: " + i.OpCode.ToString() + " " + i.Operand);
return(null);
}
for (int x = 0; x < pops; x++)
{
p.Consume(Pop());
}
if (InstructionInfo.Pushes(i))
{
Push(p);
}
else
{
_popTreeList.Add(p);
}
}
return(_popTreeList);
}