forked from OSchip/llvm-project
482 lines
18 KiB
Python
482 lines
18 KiB
Python
from __future__ import division
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import re
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import lldb.formatters.Logger
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# C++ STL formatters for LLDB
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# These formatters are based upon the version of the GNU libstdc++
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# as it ships with Mac OS X 10.6.8 thru 10.8.0
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# You are encouraged to look at the STL implementation for your platform
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# before relying on these formatters to do the right thing for your setup
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class StdListSynthProvider:
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def __init__(self, valobj, dict):
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logger = lldb.formatters.Logger.Logger()
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self.valobj = valobj
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self.count = None
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logger >> "Providing synthetic children for a list named " + \
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str(valobj.GetName())
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def next_node(self, node):
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logger = lldb.formatters.Logger.Logger()
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return node.GetChildMemberWithName('_M_next')
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def is_valid(self, node):
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logger = lldb.formatters.Logger.Logger()
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valid = self.value(self.next_node(node)) != self.node_address
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if valid:
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logger >> "%s is valid" % str(self.valobj.GetName())
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else:
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logger >> "synthetic value is not valid"
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return valid
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def value(self, node):
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logger = lldb.formatters.Logger.Logger()
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value = node.GetValueAsUnsigned()
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logger >> "synthetic value for {}: {}".format(
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str(self.valobj.GetName()), value)
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return value
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# Floyd's cycle-finding algorithm
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# try to detect if this list has a loop
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def has_loop(self):
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global _list_uses_loop_detector
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logger = lldb.formatters.Logger.Logger()
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if not _list_uses_loop_detector:
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logger >> "Asked not to use loop detection"
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return False
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slow = self.next
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fast1 = self.next
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fast2 = self.next
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while self.is_valid(slow):
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slow_value = self.value(slow)
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fast1 = self.next_node(fast2)
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fast2 = self.next_node(fast1)
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if self.value(fast1) == slow_value or self.value(
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fast2) == slow_value:
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return True
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slow = self.next_node(slow)
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return False
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def num_children(self):
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logger = lldb.formatters.Logger.Logger()
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if self.count is None:
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# libstdc++ 6.0.21 added dedicated count field.
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count_child = self.node.GetChildMemberWithName('_M_data')
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if count_child and count_child.IsValid():
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self.count = count_child.GetValueAsUnsigned(0)
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if self.count is None:
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self.count = self.num_children_impl()
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return self.count
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def num_children_impl(self):
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logger = lldb.formatters.Logger.Logger()
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try:
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next_val = self.next.GetValueAsUnsigned(0)
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prev_val = self.prev.GetValueAsUnsigned(0)
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# After a std::list has been initialized, both next and prev will
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# be non-NULL
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if next_val == 0 or prev_val == 0:
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return 0
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if next_val == self.node_address:
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return 0
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if next_val == prev_val:
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return 1
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if self.has_loop():
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return 0
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size = 2
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current = self.next
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while current.GetChildMemberWithName(
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'_M_next').GetValueAsUnsigned(0) != self.node_address:
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size = size + 1
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current = current.GetChildMemberWithName('_M_next')
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return (size - 1)
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except:
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return 0
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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 >> "Fetching 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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try:
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offset = index
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current = self.next
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while offset > 0:
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current = current.GetChildMemberWithName('_M_next')
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offset = offset - 1
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return current.CreateChildAtOffset(
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'[' + str(index) + ']',
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2 * current.GetType().GetByteSize(),
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self.data_type)
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except:
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return None
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def extract_type(self):
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logger = lldb.formatters.Logger.Logger()
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list_type = self.valobj.GetType().GetUnqualifiedType()
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if list_type.IsReferenceType():
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list_type = list_type.GetDereferencedType()
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if list_type.GetNumberOfTemplateArguments() > 0:
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data_type = list_type.GetTemplateArgumentType(0)
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else:
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data_type = None
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return data_type
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def update(self):
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logger = lldb.formatters.Logger.Logger()
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# preemptively setting this to None - we might end up changing our mind
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# later
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self.count = None
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try:
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impl = self.valobj.GetChildMemberWithName('_M_impl')
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self.node = impl.GetChildMemberWithName('_M_node')
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self.node_address = self.valobj.AddressOf().GetValueAsUnsigned(0)
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self.next = self.node.GetChildMemberWithName('_M_next')
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self.prev = self.node.GetChildMemberWithName('_M_prev')
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self.data_type = self.extract_type()
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self.data_size = self.data_type.GetByteSize()
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except:
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pass
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def has_children(self):
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return True
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class StdVectorSynthProvider:
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class StdVectorImplementation(object):
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def __init__(self, valobj):
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self.valobj = valobj
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self.count = None
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def num_children(self):
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if self.count is None:
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self.count = self.num_children_impl()
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return self.count
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def num_children_impl(self):
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try:
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start_val = self.start.GetValueAsUnsigned(0)
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finish_val = self.finish.GetValueAsUnsigned(0)
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end_val = self.end.GetValueAsUnsigned(0)
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# Before a vector has been constructed, it will contain bad values
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# so we really need to be careful about the length we return since
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# uninitialized data can cause us to return a huge number. We need
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# to also check for any of the start, finish or end of storage values
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# being zero (NULL). If any are, then this vector has not been
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# initialized yet and we should return zero
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# Make sure nothing is NULL
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if start_val == 0 or finish_val == 0 or end_val == 0:
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return 0
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# Make sure start is less than finish
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if start_val >= finish_val:
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return 0
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# Make sure finish is less than or equal to end of storage
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if finish_val > end_val:
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return 0
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# if we have a struct (or other data type that the compiler pads to native word size)
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# this check might fail, unless the sizeof() we get is itself incremented to take the
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# padding bytes into account - on current clang it looks like
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# this is the case
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num_children = (finish_val - start_val)
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if (num_children % self.data_size) != 0:
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return 0
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else:
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num_children = num_children // self.data_size
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return num_children
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except:
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return 0
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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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try:
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offset = index * self.data_size
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return self.start.CreateChildAtOffset(
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'[' + str(index) + ']', offset, self.data_type)
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except:
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return None
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def update(self):
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# preemptively setting this to None - we might end up changing our
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# mind later
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self.count = None
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try:
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impl = self.valobj.GetChildMemberWithName('_M_impl')
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self.start = impl.GetChildMemberWithName('_M_start')
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self.finish = impl.GetChildMemberWithName('_M_finish')
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self.end = impl.GetChildMemberWithName('_M_end_of_storage')
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self.data_type = self.start.GetType().GetPointeeType()
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self.data_size = self.data_type.GetByteSize()
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# if any of these objects is invalid, it means there is no
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# point in trying to fetch anything
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if self.start.IsValid() and self.finish.IsValid(
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) and self.end.IsValid() and self.data_type.IsValid():
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self.count = None
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else:
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self.count = 0
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except:
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pass
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return True
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class StdVBoolImplementation(object):
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def __init__(self, valobj, bool_type):
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self.valobj = valobj
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self.bool_type = bool_type
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self.valid = False
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def num_children(self):
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if self.valid:
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start = self.start_p.GetValueAsUnsigned(0)
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finish = self.finish_p.GetValueAsUnsigned(0)
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offset = self.offset.GetValueAsUnsigned(0)
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if finish >= start:
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return (finish - start) * 8 + offset
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return 0
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def get_child_at_index(self, index):
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if index >= self.num_children():
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return None
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element_type = self.start_p.GetType().GetPointeeType()
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element_bits = 8 * element_type.GetByteSize()
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element_offset = (index // element_bits) * \
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element_type.GetByteSize()
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bit_offset = index % element_bits
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element = self.start_p.CreateChildAtOffset(
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'[' + str(index) + ']', element_offset, element_type)
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bit = element.GetValueAsUnsigned(0) & (1 << bit_offset)
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if bit != 0:
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value_expr = "(bool)true"
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else:
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value_expr = "(bool)false"
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return self.valobj.CreateValueFromExpression(
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"[%d]" % index, value_expr)
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def update(self):
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try:
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m_impl = self.valobj.GetChildMemberWithName('_M_impl')
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self.m_start = m_impl.GetChildMemberWithName('_M_start')
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self.m_finish = m_impl.GetChildMemberWithName('_M_finish')
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self.start_p = self.m_start.GetChildMemberWithName('_M_p')
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self.finish_p = self.m_finish.GetChildMemberWithName('_M_p')
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self.offset = self.m_finish.GetChildMemberWithName('_M_offset')
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self.valid = True
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except:
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self.valid = False
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return True
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def __init__(self, valobj, dict):
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logger = lldb.formatters.Logger.Logger()
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first_template_arg_type = valobj.GetType().GetTemplateArgumentType(0)
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if str(first_template_arg_type.GetName()) == "bool":
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self.impl = self.StdVBoolImplementation(
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valobj, first_template_arg_type)
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else:
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self.impl = self.StdVectorImplementation(valobj)
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logger >> "Providing synthetic children for a vector named " + \
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str(valobj.GetName())
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def num_children(self):
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return self.impl.num_children()
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def get_child_index(self, name):
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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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return self.impl.get_child_at_index(index)
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def update(self):
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return self.impl.update()
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def has_children(self):
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return True
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class StdMapSynthProvider:
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def __init__(self, valobj, dict):
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logger = lldb.formatters.Logger.Logger()
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self.valobj = valobj
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self.count = None
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logger >> "Providing synthetic children for a map named " + \
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str(valobj.GetName())
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# we need this function as a temporary workaround for rdar://problem/10801549
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# which prevents us from extracting the std::pair<K,V> SBType out of the template
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# arguments for _Rep_Type _M_t in the map itself - because we have to make up the
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# typename and then find it, we may hit the situation were std::string has multiple
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# names but only one is actually referenced in the debug information. hence, we need
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# to replace the longer versions of std::string with the shorter one in order to be able
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# to find the type name
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def fixup_class_name(self, class_name):
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logger = lldb.formatters.Logger.Logger()
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if class_name == 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >':
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return 'std::basic_string<char>', True
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if class_name == 'basic_string<char, std::char_traits<char>, std::allocator<char> >':
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return 'std::basic_string<char>', True
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if class_name == 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >':
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return 'std::basic_string<char>', True
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if class_name == 'basic_string<char, std::char_traits<char>, std::allocator<char> >':
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return 'std::basic_string<char>', True
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return class_name, False
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def update(self):
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logger = lldb.formatters.Logger.Logger()
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# preemptively setting this to None - we might end up changing our mind
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# later
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self.count = None
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try:
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# we will set this to True if we find out that discovering a node in the map takes more steps than the overall size of the RB tree
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# if this gets set to True, then we will merrily return None for
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# any child from that moment on
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self.garbage = False
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self.Mt = self.valobj.GetChildMemberWithName('_M_t')
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self.Mimpl = self.Mt.GetChildMemberWithName('_M_impl')
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self.Mheader = self.Mimpl.GetChildMemberWithName('_M_header')
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map_type = self.valobj.GetType()
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if map_type.IsReferenceType():
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logger >> "Dereferencing type"
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map_type = map_type.GetDereferencedType()
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# Get the type of std::pair<key, value>. It is the first template
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# argument type of the 4th template argument to std::map.
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allocator_type = map_type.GetTemplateArgumentType(3)
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self.data_type = allocator_type.GetTemplateArgumentType(0)
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if not self.data_type:
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# GCC does not emit DW_TAG_template_type_parameter for
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# std::allocator<...>. For such a case, get the type of
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# std::pair from a member of std::map.
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rep_type = self.valobj.GetChildMemberWithName('_M_t').GetType()
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self.data_type = rep_type.GetTypedefedType().GetTemplateArgumentType(1)
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# from libstdc++ implementation of _M_root for rbtree
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self.Mroot = self.Mheader.GetChildMemberWithName('_M_parent')
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self.data_size = self.data_type.GetByteSize()
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self.skip_size = self.Mheader.GetType().GetByteSize()
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except:
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pass
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def num_children(self):
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logger = lldb.formatters.Logger.Logger()
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if self.count is None:
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self.count = self.num_children_impl()
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return self.count
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def num_children_impl(self):
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logger = lldb.formatters.Logger.Logger()
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try:
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root_ptr_val = self.node_ptr_value(self.Mroot)
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if root_ptr_val == 0:
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return 0
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count = self.Mimpl.GetChildMemberWithName(
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'_M_node_count').GetValueAsUnsigned(0)
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logger >> "I have " + str(count) + " children available"
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return count
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except:
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return 0
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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 >> "Being asked to fetch 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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if self.garbage:
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logger >> "Returning None since we are a garbage tree"
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return None
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try:
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offset = index
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current = self.left(self.Mheader)
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while offset > 0:
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current = self.increment_node(current)
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offset = offset - 1
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# skip all the base stuff and get at the data
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return current.CreateChildAtOffset(
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'[' + str(index) + ']', self.skip_size, self.data_type)
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except:
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return None
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# utility functions
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def node_ptr_value(self, node):
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logger = lldb.formatters.Logger.Logger()
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return node.GetValueAsUnsigned(0)
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def right(self, node):
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logger = lldb.formatters.Logger.Logger()
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return node.GetChildMemberWithName("_M_right")
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def left(self, node):
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logger = lldb.formatters.Logger.Logger()
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return node.GetChildMemberWithName("_M_left")
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def parent(self, node):
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logger = lldb.formatters.Logger.Logger()
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return node.GetChildMemberWithName("_M_parent")
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# from libstdc++ implementation of iterator for rbtree
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def increment_node(self, node):
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logger = lldb.formatters.Logger.Logger()
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max_steps = self.num_children()
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if self.node_ptr_value(self.right(node)) != 0:
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x = self.right(node)
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max_steps -= 1
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while self.node_ptr_value(self.left(x)) != 0:
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x = self.left(x)
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max_steps -= 1
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logger >> str(max_steps) + " more to go before giving up"
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if max_steps <= 0:
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self.garbage = True
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return None
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return x
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else:
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x = node
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y = self.parent(x)
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max_steps -= 1
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while(self.node_ptr_value(x) == self.node_ptr_value(self.right(y))):
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x = y
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y = self.parent(y)
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max_steps -= 1
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logger >> str(max_steps) + " more to go before giving up"
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if max_steps <= 0:
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self.garbage = True
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return None
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if self.node_ptr_value(self.right(x)) != self.node_ptr_value(y):
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x = y
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return x
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def has_children(self):
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return True
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_list_uses_loop_detector = True
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