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
new file mode 100644
index 0000000000000000000000000000000000000000..94204d7d920b9083be7940398ba3096c9559dc62
--- /dev/null
+++ b/Source/core/inspector/PromiseOfficer.cpp
@@ -0,0 +1,129 @@
+/*
+ * 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 "bindings/v8/V8Binding.h"
+#include "core/inspector/PromiseOfficer.h"
+#include "wtf/CurrentTime.h"
+
+namespace WebCore {
+
+PromiseOfficer::PromiseData::PromiseData(v8::Handle<v8::Object> promise, v8::Handle<v8::Object> parentPromise, v8::Handle<v8::Value> result, V8PromiseCustom::PromiseState state, double timestamp, v8::Isolate* isolate)
+    : m_isolate(isolate)
+    , m_promise(m_isolate, promise)
+    , m_parentPromise(m_isolate, parentPromise)
+    , m_result(m_isolate, result)
+    , m_state(state)
+    , m_timeOnCreate(timestamp)
+    , m_timeOnSettle(-1)
+    , m_callStackOnCreate(createScriptCallStack(ScriptCallStack::maxCallStackSizeToCapture, true))
+    , m_callStackOnSettle(RefPtr<ScriptCallStack>())

[yurys, 2014/03/05 15:23:35]

compiler will generate this automatically

[Alexandra Mikhaylova, 2014/03/07 11:11:44]

Done.

+{
+}
+
+void PromiseOfficer::PromiseData::didSettlePromise(double timestamp)
+{
+    m_timeOnSettle = timestamp;
+    m_callStackOnSettle = createScriptCallStack(ScriptCallStack::maxCallStackSizeToCapture, true);
+}
+
+void PromiseOfficer::enable()
+{
+    m_isEnabled = true;
+}
+
+void PromiseOfficer::disable()
+{
+    m_isEnabled = false;
+    clear();
+}
+
+void PromiseOfficer::clear()
+{
+    m_promiseDataMap.clear();
+}
+
+void PromiseOfficer::didCreatePromise(ExecutionContext* context, v8::Handle<v8::Object> promise)
+{
+    ASSERT(isEnabled());
+
+    double timestamp = currentTimeMS();
+
+    int promiseHash = promise->GetIdentityHash();
+    PromiseDataVector* vector;
+    PromiseDataMap::iterator it = m_promiseDataMap.find(promiseHash);

[yurys, 2014/03/05 15:23:35]

Why not use a HashMap (with appropriate HashTraits) from promise to PromiseData
instead of this ad hoc implementation of a hash map?

[Alexandra Mikhaylova, 2014/03/07 11:11:44]

Thanks, fixed it.

+    if (it != m_promiseDataMap.end())
+        vector = &it->value;
+    else
+        vector = &m_promiseDataMap.add(promiseHash, PromiseDataVector()).storedValue->value;
+    v8::Isolate* isolate = toIsolate(context);
+    vector->append(adoptRef(new PromiseData(promise, v8::Handle<v8::Object>(), v8::Undefined(isolate), V8PromiseCustom::Pending, timestamp, isolate)));
+}
+
+void PromiseOfficer::didUpdatePromiseParent(v8::Handle<v8::Object> promise, v8::Handle<v8::Object> parentPromise)
+{
+    ASSERT(isEnabled());
+
+    int promiseHash = promise->GetIdentityHash();
+    PromiseDataMap::iterator it = m_promiseDataMap.find(promiseHash);
+    PromiseDataVector& vector = it->value;
+    for (size_t index = 0; index < vector.size(); ++index) {
+        RefPtr<PromiseData> data = vector[index];
+        if (data->m_promise == promise) {
+            data->m_parentPromise.set(data->m_isolate, parentPromise);
+            break;
+        }
+    }
+}
+
+void PromiseOfficer::didUpdatePromiseState(v8::Handle<v8::Object> promise, V8PromiseCustom::PromiseState state, v8::Handle<v8::Value> result)
+{
+    ASSERT(isEnabled());
+
+    double timestamp = currentTimeMS();
+
+    int promiseHash = promise->GetIdentityHash();
+    PromiseDataMap::iterator it = m_promiseDataMap.find(promiseHash);
+    PromiseDataVector& vector = it->value;
+    for (size_t index = 0; index < vector.size(); ++index) {
+        RefPtr<PromiseData> data = vector[index];
+        if (data->m_promise == promise) {
+            data->m_state = state;
+            data->m_result.set(data->m_isolate, result);
+            if (state == V8PromiseCustom::Fulfilled || state == V8PromiseCustom::Rejected)
+                data->didSettlePromise(timestamp);
+            break;
+        }
+    }
+}
+
+} // namespace WebCore