1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/gdb/mozilla/JSObject.py Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,55 @@
1.4 +# Pretty-printers for SpiderMonkey JSObjects.
1.5 +
1.6 +import gdb
1.7 +import mozilla.JSString
1.8 +import mozilla.prettyprinters as prettyprinters
1.9 +from mozilla.prettyprinters import ptr_pretty_printer, ref_pretty_printer
1.10 +from mozilla.Root import deref
1.11 +
1.12 +prettyprinters.clear_module_printers(__name__)
1.13 +
1.14 +class JSObjectTypeCache(object):
1.15 + def __init__(self, value, cache):
1.16 + # In GDB 7.4.50, with some programs, this first dummy gdb.lookup_type
1.17 + # call is required to make the second lookup_type call succeed. A GDB
1.18 + # built from the public sources as of 2012-12-12 did not require the
1.19 + # dummy lookup.
1.20 + gdb.lookup_type('js::BaseShape')
1.21 + baseshape_flags = gdb.lookup_type('js::BaseShape::Flag')
1.22 + self.flag_DELEGATE = prettyprinters.enum_value(baseshape_flags, 'js::BaseShape::DELEGATE')
1.23 + self.func_ptr_type = gdb.lookup_type('JSFunction').pointer()
1.24 +
1.25 +# There should be no need to register this for JSFunction as well, since we
1.26 +# search for pretty-printers under the names of base classes, and
1.27 +# JSFunction has JSObject as a base class.
1.28 +
1.29 +@ptr_pretty_printer('JSObject')
1.30 +class JSObjectPtrOrRef(prettyprinters.Pointer):
1.31 + def __init__(self, value, cache):
1.32 + super(JSObjectPtrOrRef, self).__init__(value, cache)
1.33 + if not cache.mod_JSObject:
1.34 + cache.mod_JSObject = JSObjectTypeCache(value, cache)
1.35 + self.otc = cache.mod_JSObject
1.36 +
1.37 + def summary(self):
1.38 + shape = deref(self.value['shape_'])
1.39 + baseshape = deref(shape['base_'])
1.40 + otype = deref(self.value['type_'])
1.41 + class_name = otype['clasp_']['name'].string()
1.42 + flags = baseshape['flags']
1.43 + is_delegate = bool(flags & self.otc.flag_DELEGATE)
1.44 + name = None
1.45 + if class_name == 'Function':
1.46 + function = self.value
1.47 + concrete_type = function.type.strip_typedefs()
1.48 + if concrete_type.code == gdb.TYPE_CODE_REF:
1.49 + function = function.address
1.50 + function = function.cast(self.otc.func_ptr_type)
1.51 + atom = deref(function['atom_'])
1.52 + name = str(atom) if atom else '<unnamed>'
1.53 + return '[object %s%s]%s' % (class_name,
1.54 + ' ' + name if name else '',
1.55 + ' delegate' if is_delegate else '')
1.56 +
1.57 +@ref_pretty_printer('JSObject')
1.58 +def JSObjectRef(value, cache): return JSObjectPtrOrRef(value, cache)
