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125 lines
4.7 KiB
125 lines
4.7 KiB
import lldb
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_map_capping_size = 255
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class libcxx_hash_table_SynthProvider:
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def __init__(self, valobj, dict):
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self.valobj = valobj
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self.num_elements = None
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self.next_element = None
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self.bucket_count = None
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def update(self):
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logger = lldb.formatters.Logger.Logger()
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self.num_elements = None
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self.next_element = None
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self.bucket_count = None
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try:
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# unordered_map is made up of a hash_map, which has 4 pieces in it:
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# bucket list :
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# array of buckets
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# p1 (pair):
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# first - pointer to first loaded element
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# p2 (pair):
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# first - number of elements
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# second - hash function
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# p3 (pair):
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# first - max_load_factor
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# second - equality operator function
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#
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# For display, we actually don't need to go inside the buckets, since 'p1' has a way to iterate over all
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# the elements directly.
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#
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# We will calculate other values about the map because they will be useful for the summary.
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#
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table = self.valobj.GetChildMemberWithName('__table_')
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bl_ptr = table.GetChildMemberWithName(
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'__bucket_list_').GetChildMemberWithName('__ptr_')
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self.bucket_array_ptr = bl_ptr.GetChildMemberWithName(
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'__first_').GetValueAsUnsigned(0)
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self.bucket_count = bl_ptr.GetChildMemberWithName('__second_').GetChildMemberWithName(
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'__data_').GetChildMemberWithName('__first_').GetValueAsUnsigned(0)
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logger >> "Bucket count = %r" % self.bucket_count
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self.begin_ptr = table.GetChildMemberWithName('__p1_').GetChildMemberWithName(
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'__first_').GetChildMemberWithName('__next_')
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self.num_elements = table.GetChildMemberWithName(
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'__p2_').GetChildMemberWithName('__first_').GetValueAsUnsigned(0)
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self.max_load_factor = table.GetChildMemberWithName(
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'__p3_').GetChildMemberWithName('__first_').GetValueAsUnsigned(0)
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logger >> "Num elements = %r" % self.num_elements
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# save the pointers as we get them
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# -- don't access this first element if num_element==0!
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self.elements_cache = []
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if self.num_elements:
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self.next_element = self.begin_ptr
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else:
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self.next_element = None
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except Exception as e:
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logger >> "Caught exception: %r" % e
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pass
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def num_children(self):
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global _map_capping_size
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num_elements = self.num_elements
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if num_elements is not None:
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if num_elements > _map_capping_size:
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num_elements = _map_capping_size
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return num_elements
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def has_children(self):
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return True
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def get_child_index(self, name):
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logger = lldb.formatters.Logger.Logger()
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try:
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return int(name.lstrip('[').rstrip(']'))
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except:
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return -1
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def get_child_at_index(self, index):
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logger = lldb.formatters.Logger.Logger()
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logger >> "Retrieving child " + str(index)
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if index < 0:
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return None
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if index >= self.num_children():
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return None
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# extend
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logger >> " : cache size starts with %d elements" % len(
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self.elements_cache)
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while index >= len(self.elements_cache):
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# if we hit the end before we get the index, give up:
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if not self.next_element:
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logger >> " : hit end of list"
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return None
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node = self.next_element.Dereference()
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value = node.GetChildMemberWithName('__value_')
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hash_value = node.GetChildMemberWithName(
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'__hash_').GetValueAsUnsigned()
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self.elements_cache.append((value, hash_value))
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self.next_element = node.GetChildMemberWithName('__next_')
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if not self.next_element.GetValueAsUnsigned(0):
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self.next_element = None
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# hit the index! so we have the value
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logger >> " : cache size ends with %d elements" % len(
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self.elements_cache)
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value, hash_value = self.elements_cache[index]
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return self.valobj.CreateValueFromData(
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'[%d] <hash %d>' %
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(index, hash_value), value.GetData(), value.GetType())
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def __lldb_init_module(debugger, dict):
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debugger.HandleCommand(
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'type synthetic add -l unordered_multi.libcxx_hash_table_SynthProvider -x "^(std::__1::)unordered_(multi)?(map|set)<.+> >$" -w libcxx')
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