webkitgtk-2.10.2webkitgtk-2.10.2

1 files changed, 68 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/bytecode/CodeBlockHash.cpp b/Source/JavaScriptCore/bytecode/CodeBlockHash.cpp
new file mode 100644
index 000000000..87c092f64
--- /dev/null
+++ b/Source/JavaScriptCore/bytecode/CodeBlockHash.cpp
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2012, 2013 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 "CodeBlockHash.h"
+
+#include "SourceCode.h"
+#include <wtf/SHA1.h>
+#include <wtf/SixCharacterHash.h>
+
+namespace JSC {
+
+CodeBlockHash::CodeBlockHash(const char* string)
+    : m_hash(sixCharacterHashStringToInteger(string))
+{
+}
+
+CodeBlockHash::CodeBlockHash(const SourceCode& sourceCode, CodeSpecializationKind kind)
+    : m_hash(0)
+{
+    SHA1 sha1;
+    sha1.addBytes(sourceCode.toUTF8());
+    SHA1::Digest digest;
+    sha1.computeHash(digest);
+    m_hash += digest[0] | (digest[1] << 8) | (digest[2] << 16) | (digest[3] << 24);
+    m_hash ^= static_cast<unsigned>(kind);
+    
+    // Ensure that 0 corresponds to the hash not having been computed.
+    if (!m_hash)
+        m_hash = 1;
+}
+
+void CodeBlockHash::dump(PrintStream& out) const
+{
+    std::array<char, 7> buffer = integerToSixCharacterHashString(m_hash);
+    
+#if !ASSERT_DISABLED
+    CodeBlockHash recompute(buffer.data());
+    ASSERT(recompute == *this);
+#endif // !ASSERT_DISABLED
+    
+    out.print(buffer.data());
+}
+
+} // namespace JSC
+