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Bug 843264. Allow returning sequences of non-primitive types from callback methods. r=mccr8
This commit is contained in:
Boris Zbarsky
parent
8406904ff2
commit
560478bb6b
@ -2270,7 +2270,8 @@ ${target} = tmp.forget();""").substitute(self.substitution)
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# If this function is modified, modify CGNativeMember.getArg and
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# CGNativeMember.getRetvalInfo accordingly. The latter cares about the decltype
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# and holdertype we end up using.
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# and holdertype we end up using, because it needs to be able to return the code
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# that will convert those to the actual return value of the callback function.
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def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
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isDefinitelyObject=False,
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isMember=False,
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@ -2284,7 +2285,8 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
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isNullOrUndefined=False,
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exceptionCode=None,
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lenientFloatCode=None,
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allowTreatNonCallableAsNull=False):
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allowTreatNonCallableAsNull=False,
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isCallbackReturnValue=False):
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"""
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Get a template for converting a JS value to a native object based on the
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given type and descriptor. If failureCode is given, then we're actually
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@ -2328,6 +2330,10 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
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If allowTreatNonCallableAsNull is true, then [TreatNonCallableAsNull]
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extended attributes on nullable callback functions will be honored.
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If isCallbackReturnValue is true, then the declType may be adjusted to make
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it easier to return from a callback. Since that type is never directly
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observable by any consumers of the callback code, this is OK.
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The return value from this function is a tuple consisting of four things:
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1) A string representing the conversion code. This will have template
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@ -2490,7 +2496,7 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
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# nullable and optional cases because we don't want to leak the
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# AutoSequence type to consumers, which would be unavoidable with
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# Nullable<AutoSequence> or Optional<AutoSequence>.
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if isMember or isOptional or nullable:
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if isMember or isOptional or nullable or isCallbackReturnValue:
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sequenceClass = "Sequence"
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else:
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sequenceClass = "AutoSequence"
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@ -2498,7 +2504,8 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
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(elementTemplate, elementDeclType,
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elementHolderType, dealWithOptional) = getJSToNativeConversionTemplate(
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elementType, descriptorProvider, isMember=True,
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exceptionCode=exceptionCode, lenientFloatCode=lenientFloatCode)
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exceptionCode=exceptionCode, lenientFloatCode=lenientFloatCode,
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isCallbackReturnValue=isCallbackReturnValue)
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if dealWithOptional:
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raise TypeError("Shouldn't have optional things in sequences")
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if elementHolderType is not None:
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@ -2514,7 +2521,7 @@ def getJSToNativeConversionTemplate(type, descriptorProvider, failureCode=None,
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# If we're optional or a member, the const will come from the Optional
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# or whatever we're a member of.
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mutableTypeName = typeName
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if not isOptional and not isMember:
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if not (isOptional or isMember or isCallbackReturnValue):
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typeName = CGWrapper(typeName, pre="const ")
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# NOTE: Keep this in sync with variadic conversions as needed
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@ -2774,14 +2781,14 @@ for (uint32_t i = 0; i < length; ++i) {
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if (descriptor.interface.isCallback() and
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descriptor.interface.identifier.name != "EventListener"):
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if descriptor.workers:
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if type.nullable():
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if type.nullable() or isCallbackReturnValue:
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declType = CGGeneric("JSObject*")
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else:
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declType = CGGeneric("NonNull<JSObject>")
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conversion = " ${declName} = &${val}.toObject();\n"
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else:
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name = descriptor.interface.identifier.name
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if type.nullable():
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if type.nullable() or isCallbackReturnValue:
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declType = CGGeneric("nsRefPtr<%s>" % name);
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else:
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declType = CGGeneric("OwningNonNull<%s>" % name)
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@ -2799,8 +2806,11 @@ for (uint32_t i = 0; i < length; ++i) {
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# This is an interface that we implement as a concrete class
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# or an XPCOM interface.
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# Allow null pointers for nullable types and old-binding classes
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argIsPointer = type.nullable() or type.unroll().inner.isExternal()
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# Allow null pointers for nullable types and old-binding classes, and
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# use an nsRefPtr or raw pointer for callback return values to make
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# them easier to return.
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argIsPointer = (type.nullable() or type.unroll().inner.isExternal() or
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isCallbackReturnValue)
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# Sequences and non-worker callbacks have to hold a strong ref to the
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# thing being passed down.
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@ -3883,7 +3893,7 @@ def dictionaryNeedsCx(dictionary, descriptorProvider):
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# whether the return value is passed in an out parameter.
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#
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# Whenever this is modified, please update CGNativeMember.getRetvalInfo as
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# needed
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# needed to keep the types compatible.
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def getRetvalDeclarationForType(returnType, descriptorProvider,
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resultAlreadyAddRefed,
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isMember=False):
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@ -7777,9 +7787,9 @@ class CGNativeMember(ClassMethod):
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returnCode = ("NS_IF_ADDREF(${declName});\n"
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"return ${declName};")
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else:
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# Decl is a NonNull.
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returnCode = ("NS_ADDREF(${declName}.Ptr());\n"
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"return ${declName}.Ptr();")
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# Decl is a non-null raw pointer.
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returnCode = ("NS_ADDREF(${declName});\n"
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"return ${declName};")
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return result.define(), "nullptr", returnCode
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if type.isCallback():
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return ("already_AddRefed<%s>" % type.unroll().identifier.name,
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@ -7799,25 +7809,19 @@ class CGNativeMember(ClassMethod):
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returnCode = ("return static_cast<%s&>(${declName}).Obj();" % type.name)
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return "JSObject*", "nullptr", returnCode
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if type.isSequence():
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# If we want to handle sequence-of-sequences return values, we're
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# going to need to fix example codegen to not produce nsTArray<void>
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# for the relevant argument...
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assert not isMember
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# Outparam. Copying is a bit suboptimal, but hard to avoid: We
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# could SwapElements if we cast away const, but even then our
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# Sequence is an auto-array, and will tend to copy. The good news
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# is that callbacks that return sequences should be pretty rare
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# anyway, and if we have to we can rejigger the codegen here to use
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# a non-const non-auto array if it's ever necessary.
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# In any case, we only support sequences of primitive values for
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# returning from a callback, for now.
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if not type.unroll().isPrimitive():
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return "void", ""
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# Outparam.
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if type.nullable():
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returnCode = ("if (${declName}.IsNull()) {\n"
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" retval.SetNull();\n"
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"} else {\n"
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" retval.SetValue() = ${declName}.Value();\n"
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" retval.SetValue().SwapElements(${declName}.Value());\n"
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"}")
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else:
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returnCode = "retval = ${declName};"
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returnCode = "retval.SwapElements(${declName});"
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return "void", "", returnCode
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raise TypeError("Don't know how to declare return value for %s" %
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type)
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@ -8715,7 +8719,8 @@ class CallbackMember(CGNativeMember):
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convertType = instantiateJSToNativeConversionTemplate(
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getJSToNativeConversionTemplate(self.retvalType,
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self.descriptor,
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exceptionCode=self.exceptionCode),
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exceptionCode=self.exceptionCode,
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isCallbackReturnValue=True),
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replacements)
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assignRetval = string.Template(
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self.getRetvalInfo(self.retvalType,
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@ -20,6 +20,15 @@ callback interface TestCallbackInterface {
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long doSomethingElse(DOMString arg, TestInterface otherArg);
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void doSequenceLongArg(sequence<long> arg);
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void doSequenceStringArg(sequence<DOMString> arg);
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sequence<long> getSequenceOfLong();
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sequence<TestInterface> getSequenceOfInterfaces();
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sequence<TestInterface>? getNullableSequenceOfInterfaces();
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sequence<TestInterface?> getSequenceOfNullableInterfaces();
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sequence<TestInterface?>? getNullableSequenceOfNullableInterfaces();
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sequence<TestCallbackInterface> getSequenceOfCallbackInterfaces();
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sequence<TestCallbackInterface>? getNullableSequenceOfCallbackInterfaces();
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sequence<TestCallbackInterface?> getSequenceOfNullableCallbackInterfaces();
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sequence<TestCallbackInterface?>? getNullableSequenceOfNullableCallbackInterfaces();
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};
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callback interface TestSingleOperationCallbackInterface {
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@ -141,15 +141,14 @@ interface TestJSImplInterface {
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[Creator]
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TestNonWrapperCacheInterface? receiveNullableNonWrapperCacheInterface();
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// Can't return sequences of interfaces from callback interface methods. See bug 843264.
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//[Creator]
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//sequence<TestNonWrapperCacheInterface> receiveNonWrapperCacheInterfaceSequence();
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//[Creator]
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//sequence<TestNonWrapperCacheInterface?> receiveNullableNonWrapperCacheInterfaceSequence();
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//[Creator]
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//sequence<TestNonWrapperCacheInterface>? receiveNonWrapperCacheInterfaceNullableSequence();
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//[Creator]
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//sequence<TestNonWrapperCacheInterface?>? receiveNullableNonWrapperCacheInterfaceNullableSequence();
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[Creator]
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sequence<TestNonWrapperCacheInterface> receiveNonWrapperCacheInterfaceSequence();
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[Creator]
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sequence<TestNonWrapperCacheInterface?> receiveNullableNonWrapperCacheInterfaceSequence();
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[Creator]
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sequence<TestNonWrapperCacheInterface>? receiveNonWrapperCacheInterfaceNullableSequence();
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[Creator]
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sequence<TestNonWrapperCacheInterface?>? receiveNullableNonWrapperCacheInterfaceNullableSequence();
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// Non-castable interface types
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IndirectlyImplementedInterface receiveOther();
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@ -220,18 +219,16 @@ interface TestJSImplInterface {
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void passSequenceOfNullableInts(sequence<long?> arg);
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void passOptionalSequenceOfNullableInts(optional sequence<long?> arg);
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void passOptionalNullableSequenceOfNullableInts(optional sequence<long?>? arg);
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// Can't return sequences of interfaces from callback interface methods. See bug 843264.
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//sequence<TestJSImplInterface> receiveCastableObjectSequence();
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//sequence<TestCallbackInterface> receiveCallbackObjectSequence();
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//sequence<TestJSImplInterface?> receiveNullableCastableObjectSequence();
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//sequence<TestCallbackInterface?> receiveNullableCallbackObjectSequence();
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//sequence<TestJSImplInterface>? receiveCastableObjectNullableSequence();
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//sequence<TestJSImplInterface?>? receiveNullableCastableObjectNullableSequence();
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// Callback interface ignores 'resultNotAddRefed'. See bug 843272.
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//sequence<TestJSImplInterface> receiveWeakCastableObjectSequence();
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//sequence<TestJSImplInterface?> receiveWeakNullableCastableObjectSequence();
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//sequence<TestJSImplInterface>? receiveWeakCastableObjectNullableSequence();
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//sequence<TestJSImplInterface?>? receiveWeakNullableCastableObjectNullableSequence();
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sequence<TestJSImplInterface> receiveCastableObjectSequence();
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sequence<TestCallbackInterface> receiveCallbackObjectSequence();
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sequence<TestJSImplInterface?> receiveNullableCastableObjectSequence();
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sequence<TestCallbackInterface?> receiveNullableCallbackObjectSequence();
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sequence<TestJSImplInterface>? receiveCastableObjectNullableSequence();
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sequence<TestJSImplInterface?>? receiveNullableCastableObjectNullableSequence();
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sequence<TestJSImplInterface> receiveWeakCastableObjectSequence();
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sequence<TestJSImplInterface?> receiveWeakNullableCastableObjectSequence();
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sequence<TestJSImplInterface>? receiveWeakCastableObjectNullableSequence();
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sequence<TestJSImplInterface?>? receiveWeakNullableCastableObjectNullableSequence();
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void passCastableObjectSequence(sequence<TestJSImplInterface> arg);
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void passNullableCastableObjectSequence(sequence<TestJSImplInterface?> arg);
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void passCastableObjectNullableSequence(sequence<TestJSImplInterface>? arg);
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@ -243,8 +240,7 @@ interface TestJSImplInterface {
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void passExternalInterfaceSequence(sequence<TestExternalInterface> arg);
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void passNullableExternalInterfaceSequence(sequence<TestExternalInterface?> arg);
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// Can't return sequences of interfaces from callback interface methods. See bug 843264.
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//sequence<DOMString> receiveStringSequence();
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sequence<DOMString> receiveStringSequence();
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// Callback interface problem. See bug 843261.
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//void passStringSequence(sequence<DOMString> arg);
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// "Can't handle sequence member 'any'; need to sort out rooting issues"
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