The Tor Browser / file comparison
comparison: js/src/gdb/mozilla/JSString.py
js/src/gdb/mozilla/JSString.py
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:117ebd1997e6 |
|---|---|
| 1 # Pretty-printers for SpiderMonkey strings. | |
| 2 | |
| 3 import gdb | |
| 4 import mozilla.prettyprinters | |
| 5 from mozilla.prettyprinters import pretty_printer, ptr_pretty_printer | |
| 6 | |
| 7 # Forget any printers from previous loads of this module. | |
| 8 mozilla.prettyprinters.clear_module_printers(__name__) | |
| 9 | |
| 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'] | |
| 18 | |
| 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 | |
| 25 | |
| 26 @ptr_pretty_printer("JSString") | |
| 27 class JSStringPtr(Common): | |
| 28 def display_hint(self): | |
| 29 return "string" | |
| 30 | |
| 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] | |
| 45 | |
| 46 def to_string(self): | |
| 47 s = u'' | |
| 48 for c in self.jschars(): | |
| 49 s += unichr(c) | |
| 50 return s | |
| 51 | |
| 52 @ptr_pretty_printer("JSAtom") | |
| 53 class JSAtomPtr(Common): | |
| 54 def to_string(self): | |
| 55 return self.value.cast(self.cache.JSString_ptr_t) |
