82 lines
2.6 KiB
Python
82 lines
2.6 KiB
Python
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import gdb
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import gdb.printing
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class SharedPointerPrinter:
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"Print a shared_ptr or weak_ptr"
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class _iterator:
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def __init__(self, sharedPointer):
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self.sharedPointer = sharedPointer
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self.managedValue = sharedPointer.val['_M_ptr']
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self.count = 0
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def __iter__(self):
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return self
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def next(self):
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if self.managedValue == 0:
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raise StopIteration
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self.count = self.count + 1
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if (self.count == 1):
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return ('Use count', self.sharedPointer.val['_M_refcount']['_M_pi']['_M_use_count'])
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elif (self.count == 2):
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return ('Weak count', self.sharedPointer.val['_M_refcount']['_M_pi']['_M_weak_count'] - 1)
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elif (self.count == 3):
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return ('Managed value', self.managedValue)
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else:
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raise StopIteration
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def __init__ (self, typename, val):
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self.typename = typename
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self.val = val
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def children (self):
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return self._iterator(self)
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def to_string (self):
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state = 'empty'
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refcounts = self.val['_M_refcount']['_M_pi']
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if refcounts != 0:
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usecount = refcounts['_M_use_count']
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weakcount = refcounts['_M_weak_count']
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if usecount == 0:
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state = 'expired, weakcount %d' % weakcount
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else:
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state = 'usecount %d, weakcount %d' % (usecount, weakcount - 1)
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return '%s (%s) to %s' % (self.typename, state, self.val['_M_ptr'])
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class UniquePointerPrinter:
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"Print a unique_ptr"
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class _iterator:
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def __init__(self, uniquePointer):
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self.uniquePointer = uniquePointer
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self.managedValue = uniquePointer.val['_M_t']['_M_head_impl']
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self.count = 0
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def __iter__(self):
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return self
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def next(self):
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if self.managedValue == 0 or self.count == 1:
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raise StopIteration
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self.count = self.count + 1
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return ('Managed value', self.managedValue)
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def __init__ (self, typename, val):
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self.val = val
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def children (self):
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return self._iterator(self)
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def to_string (self):
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v = self.val['_M_t']['_M_head_impl']
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return ('std::unique_ptr<%s> containing %s' % (str(v.type.target()),
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str(v)))
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def mk_pretty_printers():
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pp = gdb.printing.RegexpCollectionPrettyPrinter("myprinters")
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pp.add_printer('shared_ptr', '^std::shared_ptr', SharedPointerPrinter)
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pp.add_printer('unique_ptr', '^std::unique_ptr', UniquePointerPrinter)
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return pp
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