使用 gdb 漂亮的打印机在 eclipse cdt 中显示智能指针

Display smart pointers in eclipse cdt using gdb pretty printers

本文关键字：cdt 显示 智能 指针 eclipse gdb 漂亮 打印机 使用      更新时间：2023-10-16

当我调试我的 c++11 应用程序时，我想看到unique_ptr和shared_ptr指向的对象。但是使用 libstdc++ 漂亮的打印机，只打印一个带有地址和类似内容的字符串，但我无法展开它以查看其内容。我已经尝试了以下解决方法，但我没有为我工作：

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

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

按照您的链接，我完全按照迈克尔的描述做了，并且工作正常。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 行中：

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)))

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