Class CodePage

deps/v8/tools/profiling/ll_prof.py:224–262

Group of adjacent code objects.

class CodePage(object):
  """Group of adjacent code objects."""

  SHIFT = 20  # 1M pages
  SIZE = (1 << SHIFT)
  MASK = ~(SIZE - 1)

  @staticmethod
  def PageAddress(address):
    return address & CodePage.MASK

  @staticmethod
  def PageId(address):
    return address >> CodePage.SHIFT

  @staticmethod
  def PageAddressFromId(id):
    return id << CodePage.SHIFT

  def __init__(self, address):
    self.address = address
    self.code_objects = []

  def Add(self, code):
    self.code_objects.append(code)

  def Remove(self, code):
    self.code_objects.remove(code)

  def Find(self, pc):
    code_objects = self.code_objects
    for i, code in enumerate(code_objects):
      if code.start_address <= pc < code.end_address:
        code_objects[0], code_objects[i] = code, code_objects[0]
        return code
    return None

  def __iter__(self):
    return self.code_objects.__iter__()


class CodeMap(object):