From 32ea33253afbbdefd2680aa95ab5f57455272ae7 Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@digia.com>
Date: Fri, 30 Nov 2012 16:58:06 +0100
Subject: Imported WebKit commit 6a4a1d32e1d779548c726c4826cba9d69eb87601
 (http://svn.webkit.org/repository/webkit/trunk@136242)

Final import for the Qt 5.x series that implements the QtWebKit / QtWebKitWidgets split

Extra fixes will be cherry-picked.

Change-Id: I844f1ebb99c6d6b75db31d6538c2acd628e79681
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
---
 Source/JavaScriptCore/bytecode/CodeBlockHash.cpp | 90 ++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 Source/JavaScriptCore/bytecode/CodeBlockHash.cpp

(limited to 'Source/JavaScriptCore/bytecode/CodeBlockHash.cpp')

diff --git a/Source/JavaScriptCore/bytecode/CodeBlockHash.cpp b/Source/JavaScriptCore/bytecode/CodeBlockHash.cpp
new file mode 100644
index 000000000..79fe9ccb5
--- /dev/null
+++ b/Source/JavaScriptCore/bytecode/CodeBlockHash.cpp
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2012 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>
+
+namespace JSC {
+
+#define TABLE ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789")
+
+CodeBlockHash::CodeBlockHash(const char* string)
+    : m_hash(0)
+{
+    if (strlen(string) != 6)
+        CRASH();
+    
+    for (unsigned i = 0; i < 6; ++i) {
+        m_hash *= 62;
+        unsigned c = string[i];
+        if (c >= 'A' && c <= 'Z') {
+            m_hash += c - 'A';
+            continue;
+        }
+        if (c >= 'a' && c <= 'z') {
+            m_hash += c - 'a' + 26;
+            continue;
+        }
+        ASSERT(c >= '0' && c <= '9');
+        m_hash += c - '0' + 26 * 2;
+    }
+}
+
+CodeBlockHash::CodeBlockHash(const SourceCode& sourceCode, CodeSpecializationKind kind)
+    : m_hash(0)
+{
+    SHA1 sha1;
+    sha1.addBytes(sourceCode.toString().utf8());
+    Vector<uint8_t, 20> digest;
+    sha1.computeHash(digest);
+    m_hash += digest[0] | (digest[1] << 8) | (digest[2] << 16) | (digest[3] << 24);
+    m_hash ^= static_cast<unsigned>(kind);
+}
+
+void CodeBlockHash::dump(PrintStream& out) const
+{
+    ASSERT(strlen(TABLE) == 62);
+    
+    char buffer[7];
+    unsigned accumulator = m_hash;
+    for (unsigned i = 6; i--;) {
+        buffer[i] = TABLE[accumulator % 62];
+        accumulator /= 62;
+    }
+    buffer[6] = 0;
+    
+#if !ASSERT_DISABLED
+    CodeBlockHash recompute(buffer);
+    ASSERT(recompute == *this);
+#endif // !ASSERT_DISABLED
+    
+    out.print(buffer);
+}
+
+} // namespace JSC
+
-- 
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