Support Promises instrumentation on backend.

Source/core/inspector/PromiseOfficer.cpp

Index: Source/core/inspector/PromiseOfficer.cpp
diff --git a/Source/core/inspector/PromiseOfficer.cpp b/Source/core/inspector/PromiseOfficer.cpp
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index 0000000000000000000000000000000000000000..2ddfae8d76fcdaea612dfebb6ba7dcda39225d3f
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+++ b/Source/core/inspector/PromiseOfficer.cpp
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+/*
+ * Copyright (C) 2014 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "bindings/v8/ScriptCallStackFactory.h"
+#include "core/inspector/PromiseOfficer.h"
+#include "wtf/CurrentTime.h"
+
+namespace WebCore {
+
+PromiseOfficer::PromiseData::PromiseData(const ScriptObject& promise, const ScriptObject& parentPromise, const ScriptValue& result, V8PromiseCustom::PromiseState state, double timestamp)
+    : m_promise(promise)
+    , m_parentPromise(parentPromise)
+    , m_result(result)
+    , m_state(state)
+    , m_timeOnCreate(timestamp)
+    , m_timeOnSettle(-1)
+    , m_callStackOnCreate(createScriptCallStack(ScriptCallStack::maxCallStackSizeToCapture, true))
+{
+}
+
+void PromiseOfficer::PromiseData::didSettlePromise(double timestamp)
+{
+    m_timeOnSettle = timestamp;
+    m_callStackOnSettle = createScriptCallStack(ScriptCallStack::maxCallStackSizeToCapture, true);

[yurys, 2014/03/12 10:56:53]

Can we merge this with call stack tracking in AsyncCallStackTracker ?

[aandrey, 2014/03/12 11:23:14]

I don't think we can. The purposes are very different: different call stacks
(debugger vs console) as well as different points where we capture the call
stacks (triggering an async event vs updating the state of an object/promise).

+}
+
+void PromiseOfficer::enable()
+{
+    m_isEnabled = true;
+}
+
+void PromiseOfficer::disable()
+{
+    m_isEnabled = false;
+    clear();
+}
+
+void PromiseOfficer::clear()
+{
+    m_promiseDataMap.clear();
+}
+
+void PromiseOfficer::didCreatePromise(const ScriptObject& promise)
+{
+    ASSERT(isEnabled());
+
+    double timestamp = currentTimeMS();
+    m_promiseDataMap.set(promise, adoptRef(new PromiseData(promise, ScriptObject(), ScriptValue(), V8PromiseCustom::Pending, timestamp)));
+}
+
+void PromiseOfficer::didUpdatePromiseParent(const ScriptObject& promise, const ScriptObject& parentPromise)
+{
+    ASSERT(isEnabled());
+
+    RefPtr<PromiseData> data = m_promiseDataMap.get(promise);
+    ASSERT(data != NULL && data->m_promise == promise);
+    data->m_parentPromise = parentPromise;
+}
+
+void PromiseOfficer::didUpdatePromiseState(const ScriptObject& promise, V8PromiseCustom::PromiseState state, const ScriptValue& result)
+{
+    ASSERT(isEnabled());
+
+    double timestamp = currentTimeMS();
+    RefPtr<PromiseData> data = m_promiseDataMap.get(promise);
+    ASSERT(data != NULL && data->m_promise == promise);
+    data->m_state = state;
+    data->m_result = result;
+    if (state == V8PromiseCustom::Fulfilled || state == V8PromiseCustom::Rejected)
+        data->didSettlePromise(timestamp);
+}
+
+} // namespace WebCore