1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/gdb/mozilla/jsid.py Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,67 @@
1.4 +# Pretty-printers for JSID values.
1.5 +
1.6 +import gdb
1.7 +import mozilla.prettyprinters
1.8 +import mozilla.Root
1.9 +
1.10 +from mozilla.prettyprinters import pretty_printer
1.11 +
1.12 +# Forget any printers from previous loads of this module.
1.13 +mozilla.prettyprinters.clear_module_printers(__name__)
1.14 +
1.15 +@pretty_printer('jsid')
1.16 +class jsid(object):
1.17 + # Since people don't always build with macro debugging info, I can't
1.18 + # think of any way to avoid copying these values here, short of using
1.19 + # inferior calls for every operation (which, I hear, is broken from
1.20 + # pretty-printers in some recent GDBs).
1.21 + TYPE_STRING = 0x0
1.22 + TYPE_INT = 0x1
1.23 + TYPE_VOID = 0x2
1.24 + TYPE_OBJECT = 0x4
1.25 + TYPE_MASK = 0x7
1.26 +
1.27 + def __init__(self, value, cache):
1.28 + self.value = value
1.29 + self.cache = cache
1.30 + self.concrete_type = self.value.type.strip_typedefs()
1.31 +
1.32 + # SpiderMonkey has two alternative definitions of jsid: a typedef for
1.33 + # ptrdiff_t, and a struct with == and != operators defined on it.
1.34 + # Extract the bits from either one.
1.35 + def as_bits(self):
1.36 + if self.concrete_type.code == gdb.TYPE_CODE_STRUCT:
1.37 + return self.value['asBits']
1.38 + elif self.concrete_type.code == gdb.TYPE_CODE_INT:
1.39 + return self.value
1.40 + else:
1.41 + raise RuntimeError, ("definition of SpiderMonkey 'jsid' type"
1.42 + "neither struct nor integral type")
1.43 +
1.44 + def to_string(self):
1.45 + bits = self.as_bits()
1.46 + tag = bits & jsid.TYPE_MASK
1.47 + if tag == jsid.TYPE_STRING:
1.48 + body = bits.cast(self.cache.JSString_ptr_t)
1.49 + elif tag & jsid.TYPE_INT:
1.50 + body = bits >> 1
1.51 + elif tag == jsid.TYPE_VOID:
1.52 + return "JSID_VOID"
1.53 + elif tag == jsid.TYPE_OBJECT:
1.54 + body = ((bits & ~jsid.TYPE_MASK)
1.55 + .cast(self.cache.JSObject_ptr_t))
1.56 + else:
1.57 + body = "<unrecognized>"
1.58 + return '$jsid(%s)' % (body,)
1.59 +
1.60 +# Hard-code the referent type pretty-printer for jsid roots and handles.
1.61 +# See the comment for mozilla.Root.Common.__init__.
1.62 +@pretty_printer('JS::Rooted<long>')
1.63 +def RootedJSID(value, cache):
1.64 + return mozilla.Root.Rooted(value, cache, jsid)
1.65 +@pretty_printer('JS::Handle<long>')
1.66 +def HandleJSID(value, cache):
1.67 + return mozilla.Root.Handle(value, cache, jsid)
1.68 +@pretty_printer('JS::MutableHandle<long>')
1.69 +def MutableHandleJSID(value, cache):
1.70 + return mozilla.Root.MutableHandle(value, cache, jsid)
