webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 91 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/wasm/WasmMemory.h b/Source/JavaScriptCore/wasm/WasmMemory.h
new file mode 100644
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+++ b/Source/JavaScriptCore/wasm/WasmMemory.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#pragma once
+
+#if ENABLE(WEBASSEMBLY)
+
+#include "WasmCallingConvention.h"
+#include "WasmPageCount.h"
+
+namespace WTF {
+class PrintStream;
+}
+
+namespace JSC { namespace Wasm {
+
+class Memory {
+    WTF_MAKE_NONCOPYABLE(Memory);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    void dump(WTF::PrintStream&) const;
+
+    // FIXME: We should support other modes. see: https://bugs.webkit.org/show_bug.cgi?id=162693
+    enum class Mode {
+        BoundsChecking
+    };
+    const char* makeString(Mode) const;
+
+    Memory() = default;
+    JS_EXPORT_PRIVATE Memory(PageCount initial, PageCount maximum, bool& failed);
+    Memory(Memory&& other)
+        : m_memory(other.m_memory)
+        , m_size(other.m_size)
+        , m_initial(other.m_initial)
+        , m_maximum(other.m_maximum)
+        , m_mappedCapacity(other.m_mappedCapacity)
+        , m_mode(other.m_mode)
+    {
+        // Moving transfers ownership of the allocated memory.
+        other.m_memory = nullptr;
+    }
+    ~Memory();
+
+    void* memory() const { return m_memory; }
+    uint64_t size() const { return m_size; }
+    PageCount sizeInPages() const { return PageCount::fromBytes(m_size); }
+
+    PageCount initial() const { return m_initial; }
+    PageCount maximum() const { return m_maximum; }
+
+    Mode mode() const { return m_mode; }
+
+    bool grow(PageCount);
+
+    static ptrdiff_t offsetOfMemory() { return OBJECT_OFFSETOF(Memory, m_memory); }
+    static ptrdiff_t offsetOfSize() { return OBJECT_OFFSETOF(Memory, m_size); }
+    
+private:
+    void* m_memory { nullptr };
+    uint64_t m_size { 0 };
+    PageCount m_initial;
+    PageCount m_maximum;
+    uint64_t m_mappedCapacity { 0 };
+    Mode m_mode { Mode::BoundsChecking };
+};
+
+} } // namespace JSC::Wasm
+
+#endif // ENABLE(WEBASSEMLY)