Class TransitionArray

deps/v8/tools/grokdump.py:1588–1623

class TransitionArray(object):
  def __init__(self, array):
    self.array = array

  def IsSimpleTransition(self):
    return self.array.length <= 2

  def Length(self):
    # SimpleTransition cases
    if self.IsSimpleTransition():
      return self.array.length - 1
    return (self.array.length - 3) // 2

  def Print(self, p):
    length = self.Length()
    array = self.array

    p.Print("Transitions(%08x, length=%d)" % (array.address, length))
    p.Print("[backpointer] %s" % (array.Get(0)))
    if self.IsSimpleTransition():
      if length == 1:
        p.Print("[simple target] %s" % (array.Get(1)))
      return

    elements = array.Get(1)
    if elements is not None:
      p.Print("[elements   ] %s" % (elements))

    prototype = array.Get(2)
    if prototype is not None:
      p.Print("[prototype  ] %s" % (prototype))

    for di in range(length):
      i = 3 + di * 2
      p.Print("[%i] symbol: %s" % (di, array.Get(i + 0)))
      p.Print("[%i] target: %s" % (di, array.Get(i + 1)))


class JSFunction(HeapObject):