js/src/gdb/mozilla/JSString.py@6474c204b198
js/src/gdb/mozilla/JSString.py
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
1 # Pretty-printers for SpiderMonkey strings.
3 import gdb
4 import mozilla.prettyprinters
5 from mozilla.prettyprinters import pretty_printer, ptr_pretty_printer
7 # Forget any printers from previous loads of this module.
8 mozilla.prettyprinters.clear_module_printers(__name__)
10 # Cache information about the JSString type for this objfile.
11 class JSStringTypeCache(object):
12 def __init__(self, cache):
13 dummy = gdb.Value(0).cast(cache.JSString_ptr_t)
14 self.LENGTH_SHIFT = dummy['LENGTH_SHIFT']
15 self.FLAGS_MASK = dummy['FLAGS_MASK']
16 self.ROPE_FLAGS = dummy['ROPE_FLAGS']
17 self.ATOM_BIT = dummy['ATOM_BIT']
19 class Common(mozilla.prettyprinters.Pointer):
20 def __init__(self, value, cache):
21 super(Common, self).__init__(value, cache)
22 if not cache.mod_JSString:
23 cache.mod_JSString = JSStringTypeCache(cache)
24 self.stc = cache.mod_JSString
26 @ptr_pretty_printer("JSString")
27 class JSStringPtr(Common):
28 def display_hint(self):
29 return "string"
31 def jschars(self):
32 d = self.value['d']
33 lengthAndFlags = d['lengthAndFlags']
34 length = lengthAndFlags >> self.stc.LENGTH_SHIFT
35 is_rope = (lengthAndFlags & self.stc.FLAGS_MASK) == self.stc.ROPE_FLAGS
36 if is_rope:
37 for c in JSStringPtr(d['u1']['left'], self.cache).jschars():
38 yield c
39 for c in JSStringPtr(d['s']['u2']['right'], self.cache).jschars():
40 yield c
41 else:
42 chars = d['u1']['chars']
43 for i in xrange(length):
44 yield chars[i]
46 def to_string(self):
47 s = u''
48 for c in self.jschars():
49 s += unichr(c)
50 return s
52 @ptr_pretty_printer("JSAtom")
53 class JSAtomPtr(Common):
54 def to_string(self):
55 return self.value.cast(self.cache.JSString_ptr_t)
