webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 86 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/wasm/WasmMemoryInformation.cpp b/Source/JavaScriptCore/wasm/WasmMemoryInformation.cpp
new file mode 100644
index 000000000..6b063d351
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+++ b/Source/JavaScriptCore/wasm/WasmMemoryInformation.cpp
@@ -0,0 +1,86 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "WasmMemoryInformation.h"
+
+#if ENABLE(WEBASSEMBLY)
+
+#include "WasmCallingConvention.h"
+#include <wtf/NeverDestroyed.h>
+
+namespace JSC { namespace Wasm {
+
+const PinnedRegisterInfo& PinnedRegisterInfo::get()
+{
+    static LazyNeverDestroyed<PinnedRegisterInfo> staticPinnedRegisterInfo;
+    static std::once_flag staticPinnedRegisterInfoFlag;
+    std::call_once(staticPinnedRegisterInfoFlag, [] () {
+        Vector<PinnedSizeRegisterInfo> sizeRegisters;
+        GPRReg baseMemoryPointer;
+
+        // FIXME: We should support more than one memory size register, and we should allow different
+        //        WebAssembly.Instance to have different pins. Right now we take a vector with only one entry.
+        //        If we have more than one size register, we can have one for each load size class.
+        //        see: https://bugs.webkit.org/show_bug.cgi?id=162952
+        Vector<unsigned> pinnedSizes = { 0 };
+        unsigned remainingPinnedRegisters = pinnedSizes.size() + 1;
+        jscCallingConvention().m_calleeSaveRegisters.forEach([&] (Reg reg) {
+            GPRReg gpr = reg.gpr();
+            if (!remainingPinnedRegisters || RegisterSet::stackRegisters().get(reg))
+                return;
+            if (remainingPinnedRegisters == 1) {
+                baseMemoryPointer = gpr;
+                remainingPinnedRegisters--;
+            } else
+                sizeRegisters.append({ gpr, pinnedSizes[--remainingPinnedRegisters - 1] });
+        });
+
+        ASSERT(!remainingPinnedRegisters);
+        staticPinnedRegisterInfo.construct(WTFMove(sizeRegisters), baseMemoryPointer);
+    });
+
+    return staticPinnedRegisterInfo.get();
+}
+
+PinnedRegisterInfo::PinnedRegisterInfo(Vector<PinnedSizeRegisterInfo>&& sizeRegisters, GPRReg baseMemoryPointer)
+    : sizeRegisters(WTFMove(sizeRegisters))
+    , baseMemoryPointer(baseMemoryPointer)
+{
+}
+
+MemoryInformation::MemoryInformation(PageCount initial, PageCount maximum,  bool isImport)
+    : m_initial(initial)
+    , m_maximum(maximum)
+    , m_isImport(isImport)
+{
+    RELEASE_ASSERT(!!m_initial);
+    RELEASE_ASSERT(!m_maximum || m_maximum >= m_initial);
+    ASSERT(!!*this);
+}
+
+} } // namespace JSC::Wasm
+
+#endif // ENABLE(WEBASSEMBLY)