webkitgtk-2.10.2webkitgtk-2.10.2

1 files changed, 101 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/bytecode/DFGExitProfile.cpp b/Source/JavaScriptCore/bytecode/DFGExitProfile.cpp
new file mode 100644
index 000000000..40a25ced6
--- /dev/null
+++ b/Source/JavaScriptCore/bytecode/DFGExitProfile.cpp
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2011 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 "DFGExitProfile.h"
+
+#if ENABLE(DFG_JIT)
+
+namespace JSC { namespace DFG {
+
+ExitProfile::ExitProfile() { }
+ExitProfile::~ExitProfile() { }
+
+bool ExitProfile::add(const ConcurrentJITLocker&, const FrequentExitSite& site)
+{
+    ASSERT(site.jitType() != ExitFromAnything);
+    
+    // If we've never seen any frequent exits then create the list and put this site
+    // into it.
+    if (!m_frequentExitSites) {
+        m_frequentExitSites = std::make_unique<Vector<FrequentExitSite>>();
+        m_frequentExitSites->append(site);
+        return true;
+    }
+    
+    // Don't add it if it's already there. This is O(n), but that's OK, because we
+    // know that the total number of places where code exits tends to not be large,
+    // and this code is only used when recompilation is triggered.
+    for (unsigned i = 0; i < m_frequentExitSites->size(); ++i) {
+        if (m_frequentExitSites->at(i) == site)
+            return false;
+    }
+    
+    m_frequentExitSites->append(site);
+    return true;
+}
+
+Vector<FrequentExitSite> ExitProfile::exitSitesFor(unsigned bytecodeIndex)
+{
+    Vector<FrequentExitSite> result;
+    
+    if (!m_frequentExitSites)
+        return result;
+    
+    for (unsigned i = 0; i < m_frequentExitSites->size(); ++i) {
+        if (m_frequentExitSites->at(i).bytecodeOffset() == bytecodeIndex)
+            result.append(m_frequentExitSites->at(i));
+    }
+    
+    return result;
+}
+
+bool ExitProfile::hasExitSite(const ConcurrentJITLocker&, const FrequentExitSite& site) const
+{
+    if (!m_frequentExitSites)
+        return false;
+    
+    for (unsigned i = m_frequentExitSites->size(); i--;) {
+        if (site.subsumes(m_frequentExitSites->at(i)))
+            return true;
+    }
+    return false;
+}
+
+QueryableExitProfile::QueryableExitProfile() { }
+QueryableExitProfile::~QueryableExitProfile() { }
+
+void QueryableExitProfile::initialize(const ConcurrentJITLocker&, const ExitProfile& profile)
+{
+    if (!profile.m_frequentExitSites)
+        return;
+    
+    for (unsigned i = 0; i < profile.m_frequentExitSites->size(); ++i)
+        m_frequentExitSites.add(profile.m_frequentExitSites->at(i));
+}
+
+} } // namespace JSC::DFG
+
+#endif