Add cuckoohash_map pretty printer

libcuckoo-gdb-printers/README.md

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+# GDB Printers
+
+This directory contains a python module that allows pretty-printing a
+cuckoohash map.
+
+## Usage
+
+In order to use the libcuckoo pretty printers, add the following to your
+`~/.gdbinit`:
+
+```
+python
+import sys
+sys.path.insert(0, '/path/to/libcuckoo/libcuckoo-gdb-printers')
+from libcuckoo.printers import register_libcuckoo_printers
+register_libcuckoo_printers (None)
+end
+```

libcuckoo-gdb-printers/libcuckoo/printers.py

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+import gdb
+import gdb.printing
+
+class CuckoohashMapPrinter:
+ """Print a cuckoohash_map object"""
+
+ def __init__(self, val):
+   self.val = val
+   self.slot_per_bucket = int(self.val.type.template_argument(5))
+
+ def _iterator(self):
+   buckets_obj = self.val['buckets_']
+   hashpower = buckets_obj['hashpower_']['_M_i']
+   buckets_ptr = buckets_obj['buckets_']
+   if not buckets_ptr:
+     return
+   num_buckets = int(2**hashpower)
+   for i in range(num_buckets):
+     bucket = (buckets_ptr + i).dereference()
+     storage_value_type = gdb.lookup_type(str(bucket.type) + '::storage_value_type')
+     for j in range(self.slot_per_bucket):
+       if bucket['occupied_']['_M_elems'][j]:
+         value_blob = bucket['values_']['_M_elems'][j]
+         storage_value = value_blob.cast(storage_value_type)
+         yield ('key', storage_value['first'])
+         yield ('value', storage_value['second'])
+
+ def children(self):
+   return self._iterator()
+
+ def to_string(self):
+   return 'cuckoohash_map'
+
+ def display_hint(self):
+   return 'map'
+
+def build_pretty_printer():
+  pp = gdb.printing.RegexpCollectionPrettyPrinter("libcuckoo")
+  pp.add_printer('cuckoohash_map', '^cuckoohash_map<.*>$', CuckoohashMapPrinter)
+  return pp
+
+def register_libcuckoo_printers(objfile):
+  gdb.printing.register_pretty_printer(objfile, build_pretty_printer())