Move Navigation Timing and other various window-level objects out of page/

Source/core/page/MemoryInfo.cpp

-/*
- * Copyright (C) 2010 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 "core/page/MemoryInfo.h"
-
-#include <limits>
-#include "bindings/v8/ScriptGCEvent.h"
-#include "core/page/Frame.h"
-#include "core/page/Settings.h"
-#include "wtf/CurrentTime.h"
-#include "wtf/MainThread.h"
-#include "wtf/MathExtras.h"
-
-namespace WebCore {
-
-
-class HeapSizeCache {
-    WTF_MAKE_NONCOPYABLE(HeapSizeCache); WTF_MAKE_FAST_ALLOCATED;
-public:
-    HeapSizeCache()
-        : m_lastUpdateTime(0)
-    {
-    }
-
-    void getCachedHeapSize(HeapInfo& info)
-    {
-        maybeUpdate();
-        info = m_info;
-    }
-
-private:
-    void maybeUpdate()
-    {
-        // We rate-limit queries to once every twenty minutes to make it more difficult
-        // for attackers to compare memory usage before and after some event.
-        const double TwentyMinutesInSeconds = 20 * 60;
-
-        double now = monotonicallyIncreasingTime();
-        if (now - m_lastUpdateTime >= TwentyMinutesInSeconds) {
-            update();
-            m_lastUpdateTime = now;
-        }
-    }
-
-    void update()
-    {
-        ScriptGCEvent::getHeapSize(m_info);
-        m_info.usedJSHeapSize = quantizeMemorySize(m_info.usedJSHeapSize);
-        m_info.totalJSHeapSize = quantizeMemorySize(m_info.totalJSHeapSize);
-        m_info.jsHeapSizeLimit = quantizeMemorySize(m_info.jsHeapSizeLimit);
-    }
-
-    double m_lastUpdateTime;
-
-    HeapInfo m_info;
-};
-
-// We quantize the sizes to make it more difficult for an attacker to see precise
-// impact of operations on memory. The values are used for performance tuning,
-// and hence don't need to be as refined when the value is large, so we threshold
-// at a list of exponentially separated buckets.
-size_t quantizeMemorySize(size_t size)
-{
-    const int numberOfBuckets = 100;
-    DEFINE_STATIC_LOCAL(Vector<size_t>, bucketSizeList, ());
-
-    ASSERT(isMainThread());
-    if (bucketSizeList.isEmpty()) {
-        bucketSizeList.resize(numberOfBuckets);
-
-        float sizeOfNextBucket = 10000000.0; // First bucket size is roughly 10M.
-        const float largestBucketSize = 4000000000.0; // Roughly 4GB.
-        // We scale with the Nth root of the ratio, so that we use all the bucktes.
-        const float scalingFactor = exp(log(largestBucketSize / sizeOfNextBucket) / numberOfBuckets);
-
-        size_t nextPowerOfTen = static_cast<size_t>(pow(10, floor(log10(sizeOfNextBucket)) + 1) + 0.5);
-        size_t granularity = nextPowerOfTen / 1000; // We want 3 signficant digits.
-
-        for (int i = 0; i < numberOfBuckets; ++i) {
-            size_t currentBucketSize = static_cast<size_t>(sizeOfNextBucket);
-            bucketSizeList[i] = currentBucketSize - (currentBucketSize % granularity);
-
-            sizeOfNextBucket *= scalingFactor;
-            if (sizeOfNextBucket >= nextPowerOfTen) {
-                if (std::numeric_limits<size_t>::max() / 10 <= nextPowerOfTen)
-                    nextPowerOfTen = std::numeric_limits<size_t>::max();
-                else {
-                    nextPowerOfTen *= 10;
-                    granularity *= 10;
-                }
-            }
-
-            // Watch out for overflow, if the range is too large for size_t.
-            if (i > 0 && bucketSizeList[i] < bucketSizeList[i - 1])
-                bucketSizeList[i] = std::numeric_limits<size_t>::max();
-        }
-    }
-
-    for (int i = 0; i < numberOfBuckets; ++i) {
-        if (size <= bucketSizeList[i])
-            return bucketSizeList[i];
-    }
-
-    return bucketSizeList[numberOfBuckets - 1];
-}
-
-
-MemoryInfo::MemoryInfo(Frame* frame)
-{
-    ScriptWrappable::init(this);
-    if (!frame || !frame->settings())
-        return;
-
-    if (frame->settings()->memoryInfoEnabled())
-        ScriptGCEvent::getHeapSize(m_info);
-    else {
-        DEFINE_STATIC_LOCAL(HeapSizeCache, heapSizeCache, ());
-        heapSizeCache.getCachedHeapSize(m_info);
-    }
-}
-
-} // namespace WebCore