From 9951ad78c80e144c166a7d476cad7ffdf84332a9 Mon Sep 17 00:00:00 2001
From: Ben Longbons <b.r.longbons@gmail.com>
Date: Wed, 13 Aug 2014 14:55:49 -0700
Subject: Debug debugging

---
 src/main-gdb-head.py | 75 +++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 65 insertions(+), 10 deletions(-)

(limited to 'src/main-gdb-head.py')

diff --git a/src/main-gdb-head.py b/src/main-gdb-head.py
index d8f2001..2dac471 100644
--- a/src/main-gdb-head.py
+++ b/src/main-gdb-head.py
@@ -30,24 +30,57 @@ def get_basic_type(type_):
     return type_.unqualified()
 
 def finish():
-    global finish, initial_globals, FastPrinters
+    global finish, initial_globals, FastPrinters, EnumPrinter
 
     final_globals = {id(v):v for v in globals().values()}
-    diff = final_globals.keys() - initial_globals.keys() \
+    diff = set(final_globals.keys()) - set(initial_globals.keys()) \
             - {'finish', 'initial_globals', 'FastPrinters'}
     fp = FastPrinters()
+    ep = EnumPrinter
 
     # After this, don't access any more globals in this function.
-    del finish, initial_globals, FastPrinters
+    del finish, initial_globals, FastPrinters, EnumPrinter
 
     for i in diff:
         v = final_globals[i]
         if hasattr(v, 'children') or hasattr(v, 'to_string'):
             fp.add_printer(v)
 
-    gdb.current_objfile().pretty_printers.append(fp)
-    print('Added %d custom printers for %s'
-            % (len(fp.printers), gdb.current_objfile().filename))
+    obj = gdb.current_objfile()
+    if obj is None:
+        obj = gdb
+        filename = '<unknown>'
+    else:
+        filename = obj.filename
+    obj.pretty_printers.append(fp)
+    obj.pretty_printers.append(ep)
+    print('Added %d+1 custom printers for %s'
+            % (len(fp.printers), filename))
+
+class EnumPrinter(object):
+    __slots__ = ('_value')
+    name = 'enum-class'
+    enabled = True
+
+    def __new__(cls, v):
+        type = get_basic_type(v.type)
+        if type.code != gdb.TYPE_CODE_ENUM:
+            return None
+        return object.__new__(cls)
+
+    def __init__(self, v):
+        self._value = v
+
+    def to_string(self):
+        v = self._value
+        self.__class__.enabled = False
+        try:
+            name = str(v)
+        finally:
+            self.__class__.enabled = True
+        name = name.split('::')[-1]
+        scope = get_basic_type(v.type).tag
+        return '%s::%s' % (scope, name)
 
 class FastPrinters(object):
     ''' printer dispatch the way gdb *should* have done it
@@ -63,7 +96,7 @@ class FastPrinters(object):
         assert hasattr(cls, 'enabled')
         # TODO: check if the class name exists
         # this is really hard since templates are involved
-        self.printers[cls.name] = cls
+        self.printers[(cls.name, getattr(cls, 'depth', 0))] = cls
 
     @property
     def subprinters(self):
@@ -76,14 +109,36 @@ class FastPrinters(object):
             name, changed = __pattern.subn('', name)
         return name
 
+    def get_tag_and_depth(self, type):
+        depth = 0
+        while True:
+            type = get_basic_type(type)
+            if type.code != gdb.TYPE_CODE_PTR:
+                break
+            type = type.target()
+            depth += 1
+        return (str(type), depth)
+
     def __call__(self, value):
-        stype = get_basic_type(value.type).tag
-        #dtype = get_basic_type(value.dynamic_type).tag
+        (stype, depth) = self.get_tag_and_depth(value.type)
+        #(dtype, _) = self.get_tag_and_depth(value.dynamic_type)
         if stype is None:
             return
 
         stype = self.strip_templates(stype)
-        p = self.printers.get(stype)
+        p = self.printers.get((stype, depth))
         if p is not None and p.enabled:
             return p(value)
         return None
+
+class char(object):
+    __slots__ = ('_value')
+    name = 'char'
+    depth = 1
+    enabled = True
+
+    def __init__(self, value):
+        self._value = value
+
+    def to_string(self):
+        return self._value.lazy_string()
-- 
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