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"""
Load into LLDB with:
script import lldbDataFormatters
type synthetic add -x "^llvm::SmallVectorImpl<.+>$" -l lldbDataFormatters.SmallVectorSynthProvider
"""
# Pretty printer for llvm::SmallVector/llvm::SmallVectorImpl
class SmallVectorSynthProvider:
def __init__(self, valobj, dict):
self.valobj = valobj;
self.update() # initialize this provider
def num_children(self):
begin = self.begin.GetValueAsUnsigned(0)
end = self.end.GetValueAsUnsigned(0)
return (end - begin)/self.type_size
def get_child_index(self, name):
try:
return int(name.lstrip('[').rstrip(']'))
except:
return -1;
def get_child_at_index(self, index):
# Do bounds checking.
if index < 0:
return None
if index >= self.num_children():
return None;
offset = index * self.type_size
return self.begin.CreateChildAtOffset('['+str(index)+']',
offset, self.data_type)
def get_type_from_name(self):
import re
name = self.valobj.GetType().GetName()
# This class works with both SmallVectors and SmallVectorImpls.
res = re.match("^(llvm::)?SmallVectorImpl<(.+)>$", name)
if res:
return res.group(2)
res = re.match("^(llvm::)?SmallVector<(.+), \d+>$", name)
if res:
return res.group(2)
return None
def update(self):
self.begin = self.valobj.GetChildMemberWithName('BeginX')
self.end = self.valobj.GetChildMemberWithName('EndX')
data_type = self.get_type_from_name()
# FIXME: this sometimes returns an invalid type.
self.data_type = self.valobj.GetTarget().FindFirstType(data_type)
self.type_size = self.data_type.GetByteSize()
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