JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / runtime / ControlFlowProfiler.h

diff --git a/runtime/ControlFlowProfiler.h b/runtime/ControlFlowProfiler.h
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+/*
+ * Copyright (C) 2014 Apple Inc. All rights reserved.
+ * Copyright (C) 2014 Saam Barati. <saambarati1@gmail.com>
+ *
+ * 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. 
+ */
+
+#ifndef ControlFlowProfiler_h
+#define ControlFlowProfiler_h
+
+#include "BasicBlockLocation.h"
+#include <wtf/HashMap.h>
+#include <wtf/HashMethod.h>
+
+namespace JSC {
+
+class VM;
+
+struct BasicBlockKey {
+    BasicBlockKey()
+        : m_startOffset(-3)
+        , m_endOffset(-3)
+    { }
+
+    BasicBlockKey(int startOffset, int endOffset)
+        : m_startOffset(startOffset)
+        , m_endOffset(endOffset)
+    { }
+
+    BasicBlockKey(WTF::HashTableDeletedValueType)
+        : m_startOffset(-2)
+        , m_endOffset(-2)
+    { }
+
+    bool isHashTableDeletedValue() const { return m_startOffset == -2 && m_endOffset == -2; }
+    bool operator==(const BasicBlockKey& other) const { return m_startOffset == other.m_startOffset && m_endOffset == other.m_endOffset; }
+    unsigned hash() const { return m_startOffset + m_endOffset + 1; }
+
+    int m_startOffset;
+    int m_endOffset;
+};
+
+struct BasicBlockKeyHash {
+    static unsigned hash(const BasicBlockKey& key) { return key.hash(); }
+    static bool equal(const BasicBlockKey& a, const BasicBlockKey& b) { return a == b; }
+    static const bool safeToCompareToEmptyOrDeleted = true;
+};
+
+} // namespace JSC
+
+namespace WTF {
+
+template<typename T> struct DefaultHash;
+template<> struct DefaultHash<JSC::BasicBlockKey> {
+    typedef JSC::BasicBlockKeyHash Hash;
+};
+
+template<typename T> struct HashTraits;
+template<> struct HashTraits<JSC::BasicBlockKey> : SimpleClassHashTraits<JSC::BasicBlockKey> {
+    static const bool emptyValueIsZero = false;
+};
+
+} // namespace WTF
+
+namespace JSC {
+
+struct BasicBlockRange {
+    int m_startOffset;
+    int m_endOffset;
+    bool m_hasExecuted;
+};
+
+class ControlFlowProfiler {
+public:
+    ControlFlowProfiler();
+    ~ControlFlowProfiler();
+    BasicBlockLocation* getBasicBlockLocation(intptr_t sourceID, int startOffset, int endOffset);
+    JS_EXPORT_PRIVATE void dumpData() const;
+    Vector<BasicBlockRange> getBasicBlocksForSourceID(intptr_t sourceID, VM&) const;
+    BasicBlockLocation* dummyBasicBlock() { return &m_dummyBasicBlock; }
+    JS_EXPORT_PRIVATE bool hasBasicBlockAtTextOffsetBeenExecuted(int, intptr_t, VM&); // This function exists for testing.
+
+private:
+    typedef HashMap<BasicBlockKey, BasicBlockLocation*> BlockLocationCache;
+    typedef HashMap<intptr_t, BlockLocationCache> SourceIDBuckets;
+
+    SourceIDBuckets m_sourceIDBuckets;
+    BasicBlockLocation m_dummyBasicBlock;
+};
+
+} // namespace JSC
+
+#endif // ControlFlowProfiler_h