python - 使用 gdb pretty-print 在 eclipse cdt 中显示智能指针

Question

当我调试我的 c++11 应用程序时，我想查看 unique_ptr 和 shared_ptr 指向的对象。但是使用 libstdc++ pretty-print ，只打印了一个带有地址和类似内容的字符串，但我无法展开它来查看它的内容。我已经尝试了以下解决方法，但对我不起作用:

https://sourceware.org/ml/gdb/2013-04/msg00042.html

谁能帮我解决这个问题。其实我认为这可能是一个非常基本的问题，所以我想知道是否没有办法这样做。但是在互联网上搜索我找不到任何提示......

Answer 1

按照您的链接，我完全按照 Michael 的描述进行操作，并且效果很好。可能您在应用更改时犯了一些错误。 libstdcxx/v6/printers.py 现在应该在第 103 - 174 行:

class SharedPointerPrinter:
    "Print a shared_ptr or weak_ptr"

    class _iterator:
        def __init__(self, sharedPointer):
            self.sharedPointer = sharedPointer
            self.managedValue = sharedPointer.val['_M_ptr']
            self.count = 0

        def __iter__(self):
            return self

        def next(self):
            if self.managedValue == 0:
                raise StopIteration
            self.count = self.count + 1
            if (self.count == 1):
                return ('Use count', self.sharedPointer.val['_M_refcount']['_M_pi']['_M_use_count'])
            elif (self.count == 2):
                return ('Weak count', self.sharedPointer.val['_M_refcount']['_M_pi']['_M_weak_count'] - 1)
            elif (self.count == 3):
                return ('Managed value', self.managedValue)
            else:
                raise StopIteration

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

    def children (self):
        return self._iterator(self)

    def to_string (self):
        state = 'empty'
        refcounts = self.val['_M_refcount']['_M_pi']
        if refcounts != 0:
            usecount = refcounts['_M_use_count']
            weakcount = refcounts['_M_weak_count']
            if usecount == 0:
                state = 'expired, weakcount %d' % weakcount
            else:
                state = 'usecount %d, weakcount %d' % (usecount, weakcount - 1)
        return '%s (%s) to %s' % (self.typename, state, self.val['_M_ptr'])

class UniquePointerPrinter:
    "Print a unique_ptr"

    class _iterator:
        def __init__(self, uniquePointer):
            self.uniquePointer = uniquePointer
            self.managedValue = uniquePointer.val['_M_t']['_M_head_impl']
            self.count = 0

        def __iter__(self):
            return self

        def next(self):
            if self.managedValue == 0 or self.count == 1:
                raise StopIteration
            self.count = self.count + 1
            return ('Managed value', self.managedValue)

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

    def children (self):
        return self._iterator(self)

    def to_string (self):
        v = self.val['_M_t']['_M_head_impl']
        return ('std::unique_ptr<%s> containing %s' % (str(v.type.target()),
                                                       str(v)))

亲切的问候