JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / ftl / FTLDataSection.cpp

diff --git a/ftl/FTLDataSection.cpp b/ftl/FTLDataSection.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 "FTLDataSection.h"
+
+#if ENABLE(FTL_JIT)
+
+#include <wtf/Assertions.h>
+#include <wtf/DataLog.h>
+#include <wtf/FastMalloc.h>
+
+namespace JSC { namespace FTL {
+
+DataSection::DataSection(size_t size, unsigned alignment)
+    : m_size(size)
+{
+    RELEASE_ASSERT(WTF::bitCount(alignment) == 1);
+    
+    const unsigned nativeAlignment = 8;
+    
+    alignment = std::max(nativeAlignment, alignment);
+    
+    size_t allocatedSize = size + alignment - nativeAlignment;
+    m_allocationBase = fastMalloc(allocatedSize);
+    
+    m_base = bitwise_cast<void*>(
+        (bitwise_cast<uintptr_t>(m_allocationBase) + alignment - 1) & ~static_cast<uintptr_t>(alignment - 1));
+    
+    RELEASE_ASSERT(!(bitwise_cast<uintptr_t>(m_base) & (alignment - 1)));
+    RELEASE_ASSERT(bitwise_cast<uintptr_t>(m_base) + size <= bitwise_cast<uintptr_t>(m_allocationBase) + allocatedSize);
+}
+
+DataSection::~DataSection()
+{
+    fastFree(m_allocationBase);
+}
+
+} } // namespace JSC::FTL
+
+#endif // ENABLE(FTL_JIT)
+