1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/gdb/mozilla/JSString.py Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,55 @@
1.4 +# Pretty-printers for SpiderMonkey strings.
1.5 +
1.6 +import gdb
1.7 +import mozilla.prettyprinters
1.8 +from mozilla.prettyprinters import pretty_printer, ptr_pretty_printer
1.9 +
1.10 +# Forget any printers from previous loads of this module.
1.11 +mozilla.prettyprinters.clear_module_printers(__name__)
1.12 +
1.13 +# Cache information about the JSString type for this objfile.
1.14 +class JSStringTypeCache(object):
1.15 + def __init__(self, cache):
1.16 + dummy = gdb.Value(0).cast(cache.JSString_ptr_t)
1.17 + self.LENGTH_SHIFT = dummy['LENGTH_SHIFT']
1.18 + self.FLAGS_MASK = dummy['FLAGS_MASK']
1.19 + self.ROPE_FLAGS = dummy['ROPE_FLAGS']
1.20 + self.ATOM_BIT = dummy['ATOM_BIT']
1.21 +
1.22 +class Common(mozilla.prettyprinters.Pointer):
1.23 + def __init__(self, value, cache):
1.24 + super(Common, self).__init__(value, cache)
1.25 + if not cache.mod_JSString:
1.26 + cache.mod_JSString = JSStringTypeCache(cache)
1.27 + self.stc = cache.mod_JSString
1.28 +
1.29 +@ptr_pretty_printer("JSString")
1.30 +class JSStringPtr(Common):
1.31 + def display_hint(self):
1.32 + return "string"
1.33 +
1.34 + def jschars(self):
1.35 + d = self.value['d']
1.36 + lengthAndFlags = d['lengthAndFlags']
1.37 + length = lengthAndFlags >> self.stc.LENGTH_SHIFT
1.38 + is_rope = (lengthAndFlags & self.stc.FLAGS_MASK) == self.stc.ROPE_FLAGS
1.39 + if is_rope:
1.40 + for c in JSStringPtr(d['u1']['left'], self.cache).jschars():
1.41 + yield c
1.42 + for c in JSStringPtr(d['s']['u2']['right'], self.cache).jschars():
1.43 + yield c
1.44 + else:
1.45 + chars = d['u1']['chars']
1.46 + for i in xrange(length):
1.47 + yield chars[i]
1.48 +
1.49 + def to_string(self):
1.50 + s = u''
1.51 + for c in self.jschars():
1.52 + s += unichr(c)
1.53 + return s
1.54 +
1.55 +@ptr_pretty_printer("JSAtom")
1.56 +class JSAtomPtr(Common):
1.57 + def to_string(self):
1.58 + return self.value.cast(self.cache.JSString_ptr_t)
