JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / runtime / FunctionHasExecutedCache.cpp

diff --git a/runtime/FunctionHasExecutedCache.cpp b/runtime/FunctionHasExecutedCache.cpp
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+/*
+ * Copyright (C) 2014 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "FunctionHasExecutedCache.h"
+
+#include <limits.h>
+
+namespace JSC {
+
+bool FunctionHasExecutedCache::hasExecutedAtOffset(intptr_t id, unsigned offset)
+{
+    if (m_rangeMap.find(id) == m_rangeMap.end())
+        return false;
+
+    RangeMap& map = m_rangeMap.find(id)->second;
+    unsigned distance = UINT_MAX;
+    bool hasExecuted = false;
+    for (auto iter = map.begin(), end = map.end(); iter != end; ++iter) {
+        const FunctionRange& range = iter->first;
+        if (range.m_start <= offset && offset <= range.m_end && range.m_end - range.m_start < distance) {
+            hasExecuted = iter->second;
+            distance = range.m_end - range.m_start;
+        }
+    }
+
+    return hasExecuted;
+}
+
+void FunctionHasExecutedCache::insertUnexecutedRange(intptr_t id, unsigned start, unsigned end) 
+{
+    if (m_rangeMap.find(id) == m_rangeMap.end()) {
+        RangeMap map;
+        m_rangeMap[id] = map;
+    }
+
+    RangeMap& map = m_rangeMap.find(id)->second;
+    FunctionRange range;
+    range.m_start = start;
+    range.m_end = end;
+    // Only insert unexecuted ranges once for a given sourceID because we may run into a situation where an executable executes, then is GCed, and then is allocated again,
+    // and tries to reinsert itself, claiming it has never run, but this is false because it indeed already executed.
+    if (map.find(range) == map.end())
+        map[range] = false;
+}
+
+void FunctionHasExecutedCache::removeUnexecutedRange(intptr_t id, unsigned start, unsigned end)
+{
+    // FIXME: We should never have an instance where we return here, but currently do in some situations. Find out why.
+    if (m_rangeMap.find(id) == m_rangeMap.end())
+        return;
+
+    RangeMap& map = m_rangeMap.find(id)->second;
+
+    FunctionRange range;
+    range.m_start = start;
+    range.m_end = end;
+    map[range] = true;
+}
+
+Vector<std::tuple<bool, unsigned, unsigned>> FunctionHasExecutedCache::getFunctionRanges(intptr_t id)
+{
+    Vector<std::tuple<bool, unsigned, unsigned>> ranges(0);
+    auto findResult = m_rangeMap.find(id);
+    if (findResult == m_rangeMap.end())
+        return ranges;
+
+    RangeMap& map = m_rangeMap.find(id)->second;
+    for (auto iter = map.begin(), end = map.end(); iter != end; ++iter) {
+        const FunctionRange& range = iter->first;
+        bool hasExecuted = iter->second;
+        ranges.append(std::tuple<bool, unsigned, unsigned>(hasExecuted, range.m_start, range.m_end));
+    }
+
+    return ranges;
+}
+
+} // namespace JSC