webkitgtk-2.4.11webkitgtk-2.4.11

1 files changed, 105 insertions, 25 deletions

diff --git a/Source/JavaScriptCore/runtime/JSPromise.cpp b/Source/JavaScriptCore/runtime/JSPromise.cpp
index 22f40f029..9f182c954 100644
--- a/Source/JavaScriptCore/runtime/JSPromise.cpp
+++ b/Source/JavaScriptCore/runtime/JSPromise.cpp
@@ -26,22 +26,27 @@
 #include "config.h"
 #include "JSPromise.h"
 
+#if ENABLE(PROMISES)
+
 #include "Error.h"
 #include "JSCJSValueInlines.h"
 #include "JSCellInlines.h"
 #include "JSPromiseConstructor.h"
+#include "JSPromiseReaction.h"
 #include "Microtask.h"
 #include "SlotVisitorInlines.h"
 #include "StructureInlines.h"
 
 namespace JSC {
 
-const ClassInfo JSPromise::s_info = { "Promise", &Base::s_info, 0, CREATE_METHOD_TABLE(JSPromise) };
+static void triggerPromiseReactions(VM&, JSGlobalObject*, Vector<WriteBarrier<JSPromiseReaction>>&, JSValue);
+
+const ClassInfo JSPromise::s_info = { "Promise", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSPromise) };
 
-JSPromise* JSPromise::create(VM& vm, Structure* structure)
+JSPromise* JSPromise::create(VM& vm, JSGlobalObject* globalObject, JSPromiseConstructor* constructor)
 {
-    JSPromise* promise = new (NotNull, allocateCell<JSPromise>(vm.heap)) JSPromise(vm, structure);
-    promise->finishCreation(vm);
+    JSPromise* promise = new (NotNull, allocateCell<JSPromise>(vm.heap)) JSPromise(vm, globalObject->promiseStructure());
+    promise->finishCreation(vm, constructor);
     return promise;
 }
 
@@ -51,41 +56,116 @@ Structure* JSPromise::createStructure(VM& vm, JSGlobalObject* globalObject, JSVa
 }
 
 JSPromise::JSPromise(VM& vm, Structure* structure)
-    : Base(vm, structure)
+    : JSDestructibleObject(vm, structure)
+    , m_status(Status::Unresolved)
 {
 }
 
-void JSPromise::finishCreation(VM& vm)
+void JSPromise::finishCreation(VM& vm, JSPromiseConstructor* constructor)
 {
     Base::finishCreation(vm);
-    putDirect(vm, vm.propertyNames->promiseStatePrivateName, jsNumber(static_cast<unsigned>(Status::Pending)));
-    putDirect(vm, vm.propertyNames->promiseFulfillReactionsPrivateName, jsUndefined());
-    putDirect(vm, vm.propertyNames->promiseRejectReactionsPrivateName, jsUndefined());
-    putDirect(vm, vm.propertyNames->promiseResultPrivateName, jsUndefined());
+    ASSERT(inherits(info()));
+    
+    m_constructor.set(vm, this, constructor);
+}
+
+void JSPromise::destroy(JSCell* cell)
+{
+    static_cast<JSPromise*>(cell)->JSPromise::~JSPromise();
+}
+
+void JSPromise::visitChildren(JSCell* cell, SlotVisitor& visitor)
+{
+    JSPromise* thisObject = jsCast<JSPromise*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
+    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
+
+    Base::visitChildren(thisObject, visitor);
+
+    visitor.append(&thisObject->m_result);
+    visitor.append(&thisObject->m_constructor);
+    visitor.append(thisObject->m_resolveReactions.begin(), thisObject->m_resolveReactions.end());
+    visitor.append(thisObject->m_rejectReactions.begin(), thisObject->m_rejectReactions.end());
+}
+
+void JSPromise::reject(VM& vm, JSValue reason)
+{
+    // 1. If the value of promise's internal slot [[PromiseStatus]] is not "unresolved", return.
+    if (m_status != Status::Unresolved)
+        return;
+
+    DeferGC deferGC(vm.heap);
+
+    // 2. Let 'reactions' be the value of promise's [[RejectReactions]] internal slot.
+    Vector<WriteBarrier<JSPromiseReaction>> reactions;
+    reactions.swap(m_rejectReactions);
+
+    // 3. Set the value of promise's [[Result]] internal slot to reason.
+    m_result.set(vm, this, reason);
+
+    // 4. Set the value of promise's [[ResolveReactions]] internal slot to undefined.
+    m_resolveReactions.clear();
+
+    // 5. Set the value of promise's [[RejectReactions]] internal slot to undefined.
+    // NOTE: Handled by the swap above.
+
+    // 6. Set the value of promise's [[PromiseStatus]] internal slot to "has-rejection".
+    m_status = Status::HasRejection;
+
+    // 7. Return the result of calling TriggerPromiseReactions(reactions, reason).
+    triggerPromiseReactions(vm, globalObject(), reactions, reason);
 }
 
-void JSPromise::initialize(ExecState* exec, JSGlobalObject* globalObject, JSValue executor)
+void JSPromise::resolve(VM& vm, JSValue resolution)
 {
-    JSFunction* initializePromise = globalObject->initializePromiseFunction();
-    CallData callData;
-    CallType callType = JSC::getCallData(initializePromise, callData);
-    ASSERT(callType != CallTypeNone);
-
-    MarkedArgumentBuffer arguments;
-    arguments.append(executor);
-    call(exec, initializePromise, callType, callData, this, arguments);
+    // 1. If the value of promise's internal slot [[PromiseStatus]] is not "unresolved", return.
+    if (m_status != Status::Unresolved)
+        return;
+
+    DeferGC deferGC(vm.heap);
+
+    // 2. Let 'reactions' be the value of promise's [[ResolveReactions]] internal slot.
+    Vector<WriteBarrier<JSPromiseReaction>> reactions;
+    reactions.swap(m_resolveReactions);
+    
+    // 3. Set the value of promise's [[Result]] internal slot to resolution.
+    m_result.set(vm, this, resolution);
+
+    // 4. Set the value of promise's [[ResolveReactions]] internal slot to undefined.
+    // NOTE: Handled by the swap above.
+
+    // 5. Set the value of promise's [[RejectReactions]] internal slot to undefined.
+    m_rejectReactions.clear();
+
+    // 6. Set the value of promise's [[PromiseStatus]] internal slot to "has-resolution".
+    m_status = Status::HasResolution;
+
+    // 7. Return the result of calling TriggerPromiseReactions(reactions, resolution).
+    triggerPromiseReactions(vm, globalObject(), reactions, resolution);
 }
 
-auto JSPromise::status(VM& vm) const -> Status
+void JSPromise::appendResolveReaction(VM& vm, JSPromiseReaction* reaction)
 {
-    JSValue value = getDirect(vm, vm.propertyNames->promiseStatePrivateName);
-    ASSERT(value.isUInt32());
-    return static_cast<Status>(value.asUInt32());
+    m_resolveReactions.append(WriteBarrier<JSPromiseReaction>(vm, this, reaction));
 }
 
-JSValue JSPromise::result(VM& vm) const
+void JSPromise::appendRejectReaction(VM& vm, JSPromiseReaction* reaction)
 {
-    return getDirect(vm, vm.propertyNames->promiseResultPrivateName);
+    m_rejectReactions.append(WriteBarrier<JSPromiseReaction>(vm, this, reaction));
+}
+
+void triggerPromiseReactions(VM& vm, JSGlobalObject* globalObject, Vector<WriteBarrier<JSPromiseReaction>>& reactions, JSValue argument)
+{
+    // 1. Repeat for each reaction in reactions, in original insertion order
+    for (auto& reaction : reactions) {
+        // i. Call QueueMicrotask(ExecutePromiseReaction, (reaction, argument)).
+        globalObject->queueMicrotask(createExecutePromiseReactionMicrotask(vm, reaction.get(), argument));
+    }
+    
+    // 2. Return.
 }
 
 } // namespace JSC
+
+#endif // ENABLE(PROMISES)