utils/lldbDataFormatters.py

   1 """
   2 Load into LLDB with:
   3 script import lldbDataFormatters
   4 type synthetic add -x "^llvm::SmallVectorImpl<.+>$" -l lldbDataFormatters.SmallVectorSynthProvider
   5 type synthetic add -x "^llvm::SmallVector<.+,.+>$" -l lldbDataFormatters.SmallVectorSynthProvider
   6 """
   7
   8 # Pretty printer for llvm::SmallVector/llvm::SmallVectorImpl
   9 class SmallVectorSynthProvider:
  10     def __init__(self, valobj, dict):
  11         self.valobj = valobj;
  12         self.update() # initialize this provider
  13
  14     def num_children(self):
  15         begin = self.begin.GetValueAsUnsigned(0)
  16         end = self.end.GetValueAsUnsigned(0)
  17         return (end - begin)/self.type_size
  18
  19     def get_child_index(self, name):
  20         try:
  21             return int(name.lstrip('[').rstrip(']'))
  22         except:
  23             return -1;
  24
  25     def get_child_at_index(self, index):
  26         # Do bounds checking.
  27         if index < 0:
  28             return None
  29         if index >= self.num_children():
  30             return None;
  31
  32         offset = index * self.type_size
  33         return self.begin.CreateChildAtOffset('['+str(index)+']',
  34                                               offset, self.data_type)
  35
  36     def update(self):
  37         self.begin = self.valobj.GetChildMemberWithName('BeginX')
  38         self.end = self.valobj.GetChildMemberWithName('EndX')
  39         the_type = self.valobj.GetType()
  40         # If this is a reference type we have to dereference it to get to the
  41         # template parameter.
  42         if the_type.IsReferenceType():
  43             the_type = the_type.GetDereferencedType()
  44
  45         self.data_type = the_type.GetTemplateArgumentType(0)
  46         self.type_size = self.data_type.GetByteSize()
  47         assert self.type_size != 0