xref: /llvm-project/lldb/examples/summaries/synth.py (revision 2238dcc39358353cac21df75c3c3286ab20b8f53) 
1import lldb
2
3
4class PythonObjectSyntheticChildProvider(object):
5    def __init__(self, value, internal_dict):
6        self.value = value
7        self.values = self.make_children()
8        self.built_values = {}
9        self.bo = self.value.target.byte_order
10        self.ps = self.value.target.addr_size
11
12    def make_children(self):
13        pass
14
15    def num_children(self):
16        return len(self.values)
17
18    def get_child_index(self, name):
19        i = 0
20        for N, value in self.values:
21            if N == name:
22                return i
23            i += 1
24        return None
25
26    def update(self):
27        pass
28
29    def has_children(self):
30        return len(self.values) > 0
31
32    def gen_child(self, name, value):
33        data = None
34        type = None
35        if isinstance(value, int):
36            data = lldb.SBData.CreateDataFromUInt64Array(self.bo, self.ps, [value])
37            type = self.value.target.GetBasicType(lldb.eBasicTypeLong)
38        elif isinstance(value, float):
39            data = lldb.SBData.CreateDataFromDoubleArray(self.bo, self.ps, [value])
40            type = self.value.target.GetBasicType(lldb.eBasicTypeDouble)
41        elif isinstance(value, str):
42            data = lldb.SBData.CreateDataFromCString(self.bo, self.ps, value)
43            type = self.value.target.GetBasicType(lldb.eBasicTypeChar).GetArrayType(
44                len(value)
45            )
46        if (data is not None) and (type is not None):
47            return self.value.CreateValueFromData(name, data, type)
48        return None
49
50    def get_child_at_index(self, index):
51        if index in self.built_values:
52            return self.built_values[index]
53
54        bv = None
55
56        name, value = self.values[index]
57        bv = self.gen_child(name, value)
58        self.built_values[index] = bv
59        return bv
60