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我有一个方便的类,我可以使用它轻松地将一组“summariser”函​​数添加到 GDB 漂亮的打印机(例如,一个Rect类可以有一个 [ Area] 字段,由 Python 计算)。然后它也会打印所有现有的孩子,所以你可以一次看到所有东西。

class SummaryAndFieldIterator:
    """
    Iterator to first go through a list of summariser functions,
    then display all the fields in the object in order
    """
    def __init__ (self, obj, summaries):
        self.count = 0
        self.obj = obj;
        self.summaries = summaries;
        self.keys = sorted(obj.type.iterkeys())

    def __iter__(self):
        return self

    def __next__(self):

        if (self.count >= len(self.keys) + len(self.summaries)):
            raise StopIteration
        elif self.count < len(self.summaries):

            name, retVal = self.summaries[self.count](self.obj)
            # FIXME: this doesn't seem to work when a string is returned
            # in retVal?
            result = "[%s]" % name, retVal

        else:
            field = self.count - len(self.summaries)
            result = self.keys[field], self.obj[self.keys[field]]

        self.count += 1
        return result

    next = __next__

class MyObjectPrinter:

    def __init__(self, val):
        self.val = val

    def get_int(self):
        return "meaning", 42

    def get_string(self):
        return "hoopiness", "Forty-two"

    def children(self):
        return SummaryAndFieldIterator(self.val, [self.get_string])

这对于返回数值的汇总器非常有效,但对于字符串,它最终显示为一个数组,所以我得到

NAME                 VALUE
myobj                {..}
 |-->[meaning]      42
 |-->[hoopiness] 
      |-->[0]       'F'
      |-->[1]       'o'
       .....
 |-->real_field     34234

这大概是因为来自的字符串

name, retVal = self.summaries[self.count](self.obj)

gdb.Value当它由SummaryAndFieldIterator's__next__方法返回时,不会生成足够“字符串”的对象。调整的display_hint()方法MyObjectPrinter似乎没有任何效果(但我怀疑它会,因为这是孩子,而不是对象)。

任何人都知道如何从children()迭代器返回字符串并将其显示为字符串?

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1 回答 1

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好的,显然这可能是与 GDB/MI 与漂亮打印机通信的方式有关的错误,Bugzilla 在此处创建:https ://sourceware.org/bugzilla/show_bug.cgi?id=18282

于 2015-04-20T16:03:51.160 回答