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43d3bd71ac
In this new setup, there are three new extended attributes: Infallible, GetterInfallible, SetterInfallible. The first one applies to both methods and attributes, while the last two apply only to attributes. Each one can be either set with no value specified (in which case it applies both on main thread and in workers) or can be set to MainThread or Workers to limit where it applies. If Infallible is set on an attribute, then GetterInfallible and SetterInfallible will be ignored. So if you want to specify, for example, an attribute that's infallible on the main thread and has an infallible getter in workers, the right way to do that is [GetterInfallible, SetterInfallible=MainThread].
246 lines
10 KiB
Python
246 lines
10 KiB
Python
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this file,
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# You can obtain one at http://mozilla.org/MPL/2.0/.
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autogenerated_comment = "/* THIS FILE IS AUTOGENERATED - DO NOT EDIT */\n"
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class Configuration:
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"""
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Represents global configuration state based on IDL parse data and
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the configuration file.
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"""
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def __init__(self, filename, parseData):
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# Read the configuration file.
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glbl = {}
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execfile(filename, glbl)
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config = glbl['DOMInterfaces']
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# Build descriptors for all the interfaces we have in the parse data.
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# This allows callers to specify a subset of interfaces by filtering
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# |parseData|.
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self.descriptors = []
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self.interfaces = {}
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self.maxProtoChainLength = 0;
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for thing in parseData:
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if not thing.isInterface(): continue
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iface = thing
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if iface.identifier.name not in config: continue
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self.interfaces[iface.identifier.name] = iface
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entry = config[iface.identifier.name]
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if not isinstance(entry, list):
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assert isinstance(entry, dict)
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entry = [entry]
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self.descriptors.extend([Descriptor(self, iface, x) for x in entry])
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# Mark the descriptors for which only a single nativeType implements
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# an interface.
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for descriptor in self.descriptors:
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intefaceName = descriptor.interface.identifier.name
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otherDescriptors = [d for d in self.descriptors
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if d.interface.identifier.name == intefaceName]
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descriptor.uniqueImplementation = len(otherDescriptors) == 1
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self.enums = [e for e in parseData if e.isEnum()]
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self.dictionaries = [d for d in parseData if d.isDictionary()]
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# Keep the descriptor list sorted for determinism.
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self.descriptors.sort(lambda x,y: cmp(x.name, y.name))
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def getInterface(self, ifname):
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return self.interfaces[ifname]
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def getDescriptors(self, **filters):
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"""Gets the descriptors that match the given filters."""
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curr = self.descriptors
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for key, val in filters.iteritems():
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if key == 'webIDLFile':
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getter = lambda x: x.interface.filename()
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elif key == 'hasInterfaceObject':
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getter = lambda x: (not x.interface.isExternal() and
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x.interface.hasInterfaceObject())
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elif key == 'hasInterfacePrototypeObject':
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getter = lambda x: (not x.interface.isExternal() and
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x.interface.hasInterfacePrototypeObject())
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elif key == 'hasInterfaceOrInterfacePrototypeObject':
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getter = lambda x: x.hasInterfaceOrInterfacePrototypeObject()
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elif key == 'isCallback':
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getter = lambda x: x.interface.isCallback()
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elif key == 'isExternal':
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getter = lambda x: x.interface.isExternal()
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else:
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getter = lambda x: getattr(x, key)
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curr = filter(lambda x: getter(x) == val, curr)
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return curr
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def getEnums(self, webIDLFile):
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return filter(lambda e: e.filename() == webIDLFile, self.enums)
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def getDictionaries(self, webIDLFile):
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return filter(lambda d: d.filename() == webIDLFile, self.dictionaries)
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def getDescriptor(self, interfaceName, workers):
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"""
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Gets the appropriate descriptor for the given interface name
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and the given workers boolean.
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"""
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iface = self.getInterface(interfaceName)
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descriptors = self.getDescriptors(interface=iface)
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# The only filter we currently have is workers vs non-workers.
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matches = filter(lambda x: x.workers is workers, descriptors)
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# After filtering, we should have exactly one result.
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if len(matches) is not 1:
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raise NoSuchDescriptorError("For " + interfaceName + " found " +
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str(len(matches)) + " matches");
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return matches[0]
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def getDescriptorProvider(self, workers):
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"""
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Gets a descriptor provider that can provide descriptors as needed,
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for the given workers boolean
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"""
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return DescriptorProvider(self, workers)
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class NoSuchDescriptorError(TypeError):
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def __init__(self, str):
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TypeError.__init__(self, str)
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class DescriptorProvider:
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"""
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A way of getting descriptors for interface names
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"""
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def __init__(self, config, workers):
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self.config = config
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self.workers = workers
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def getDescriptor(self, interfaceName):
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"""
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Gets the appropriate descriptor for the given interface name given the
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context of the current descriptor. This selects the appropriate
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implementation for cases like workers.
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"""
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return self.config.getDescriptor(interfaceName, self.workers)
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class Descriptor(DescriptorProvider):
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"""
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Represents a single descriptor for an interface. See Bindings.conf.
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"""
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def __init__(self, config, interface, desc):
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DescriptorProvider.__init__(self, config, desc.get('workers', False))
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self.interface = interface
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# Read the desc, and fill in the relevant defaults.
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self.nativeType = desc['nativeType']
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self.hasInstanceInterface = desc.get('hasInstanceInterface', None)
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headerDefault = self.nativeType
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headerDefault = headerDefault.replace("::", "/") + ".h"
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self.headerFile = desc.get('headerFile', headerDefault)
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castableDefault = not self.interface.isCallback()
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self.castable = desc.get('castable', castableDefault)
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self.notflattened = desc.get('notflattened', False)
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self.register = desc.get('register', True)
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# If we're concrete, we need to crawl our ancestor interfaces and mark
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# them as having a concrete descendant.
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self.concrete = desc.get('concrete', True)
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if self.concrete:
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iface = self.interface
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while iface:
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iface.setUserData('hasConcreteDescendant', True)
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iface = iface.parent
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self.prefable = desc.get('prefable', False)
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self.nativeIsISupports = not self.workers
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self.customTrace = desc.get('customTrace', self.workers)
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self.customFinalize = desc.get('customFinalize', self.workers)
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self.wrapperCache = self.workers or desc.get('wrapperCache', True)
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if not self.wrapperCache and self.prefable:
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raise TypeError("Descriptor for %s is prefable but not wrappercached" %
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self.interface.identifier.name)
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def make_name(name):
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return name + "_workers" if self.workers else name
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self.name = make_name(interface.identifier.name)
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# self.extendedAttributes is a dict of dicts, keyed on
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# all/getterOnly/setterOnly and then on member name. Values are an
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# array of extended attributes.
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self.extendedAttributes = { 'all': {}, 'getterOnly': {}, 'setterOnly': {} }
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def addExtendedAttribute(attribute, config):
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def add(key, members, attribute):
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for member in members:
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self.extendedAttributes[key].setdefault(member, []).append(attribute)
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if isinstance(config, dict):
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for key in ['all', 'getterOnly', 'setterOnly']:
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add(key, config.get(key, []), attribute)
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elif isinstance(config, list):
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add('all', config, attribute)
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else:
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assert isinstance(config, string)
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add('all', [config], attribute)
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for attribute in ['infallible', 'implicitJSContext', 'resultNotAddRefed']:
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addExtendedAttribute(attribute, desc.get(attribute, {}))
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self.binaryNames = desc.get('binaryNames', {})
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# Build the prototype chain.
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self.prototypeChain = []
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parent = interface
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while parent:
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self.prototypeChain.insert(0, make_name(parent.identifier.name))
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parent = parent.parent
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config.maxProtoChainLength = max(config.maxProtoChainLength,
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len(self.prototypeChain))
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def hasInterfaceOrInterfacePrototypeObject(self):
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# Forward-declared interfaces don't need either interface object or
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# interface prototype object as they're going to use QI (on main thread)
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# or be passed as a JSObject (on worker threads).
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if self.interface.isExternal():
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return False
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return self.interface.hasInterfaceObject() or self.interface.hasInterfacePrototypeObject()
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def getExtendedAttributes(self, member, getter=False, setter=False):
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def ensureValidInfallibleExtendedAttribute(attr):
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assert(attr is None or attr is True or len(attr) == 1)
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if (attr is not None and attr is not True and
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'Workers' not in attr and 'MainThread' not in attr):
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raise TypeError("Unknown value for 'infallible': " + attr[0])
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name = member.identifier.name
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if member.isMethod():
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attrs = self.extendedAttributes['all'].get(name, [])
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infallible = member.getExtendedAttribute("Infallible")
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ensureValidInfallibleExtendedAttribute(infallible)
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if (infallible is not None and
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(infallible is True or
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('Workers' in infallible and self.workers) or
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('MainThread' in infallible and not self.workers))):
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attrs.append("infallible")
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return attrs
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assert member.isAttr()
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assert bool(getter) != bool(setter)
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key = 'getterOnly' if getter else 'setterOnly'
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attrs = self.extendedAttributes['all'].get(name, []) + self.extendedAttributes[key].get(name, [])
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infallible = member.getExtendedAttribute("Infallible")
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if infallible is None:
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infallibleAttr = "GetterInfallible" if getter else "SetterInfallible"
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infallible = member.getExtendedAttribute(infallibleAttr)
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ensureValidInfallibleExtendedAttribute(infallible)
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if (infallible is not None and
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(infallible is True or
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('Workers' in infallible and self.workers) or
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('MainThread' in infallible and not self.workers))):
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attrs.append("infallible")
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return attrs
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