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# Pretty-printers for SpiderMonkey JSObjects.
import re
import gdb
import mozilla.JSString
import mozilla.prettyprinters as prettyprinters
from mozilla.prettyprinters import ptr_pretty_printer, ref_pretty_printer
from mozilla.Root import deref
prettyprinters.clear_module_printers(__name__)
class JSObjectTypeCache(object):
def __init__(self, value, cache):
baseshape_flags = gdb.lookup_type('js::BaseShape::Flag')
self.flag_DELEGATE = prettyprinters.enum_value(baseshape_flags, 'js::BaseShape::DELEGATE')
self.func_ptr_type = gdb.lookup_type('JSFunction').pointer()
self.class_NON_NATIVE = gdb.parse_and_eval('js::Class::NON_NATIVE')
self.NativeObject_ptr_t = gdb.lookup_type('js::NativeObject').pointer()
# There should be no need to register this for JSFunction as well, since we
# search for pretty-printers under the names of base classes, and
# JSFunction has JSObject as a base class.
gdb_string_regexp = re.compile(r'(?:0x[0-9a-z]+ )?(?:<.*> )?"(.*)"', re.I)
@ptr_pretty_printer('JSObject')
class JSObjectPtrOrRef(prettyprinters.Pointer):
def __init__(self, value, cache):
super(JSObjectPtrOrRef, self).__init__(value, cache)
if not cache.mod_JSObject:
cache.mod_JSObject = JSObjectTypeCache(value, cache)
self.otc = cache.mod_JSObject
def summary(self):
group = deref(self.value['group_'])
classp = group['clasp_']
non_native = classp['flags'] & self.otc.class_NON_NATIVE
# Use GDB to format the class name, but then strip off the address
# and the quotes.
class_name = str(classp['name'])
m = gdb_string_regexp.match(class_name)
if m:
class_name = m.group(1)
if non_native:
return '[object {}]'.format(class_name)
else:
native = self.value.cast(self.otc.NativeObject_ptr_t)
shape = deref(native['shape_'])
baseshape = deref(shape['base_'])
flags = baseshape['flags']
is_delegate = bool(flags & self.otc.flag_DELEGATE)
name = None
if class_name == 'Function':
function = self.value
concrete_type = function.type.strip_typedefs()
if concrete_type.code == gdb.TYPE_CODE_REF:
function = function.address
function = function.cast(self.otc.func_ptr_type)
atom = deref(function['atom_'])
name = str(atom) if atom else '<unnamed>'
return '[object {}{}]{}'.format(class_name,
' ' + name if name else '',
' delegate' if is_delegate else '')
@ref_pretty_printer('JSObject')
def JSObjectRef(value, cache): return JSObjectPtrOrRef(value, cache)
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