JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / jit / PolymorphicCallStubRoutine.cpp

diff --git a/jit/PolymorphicCallStubRoutine.cpp b/jit/PolymorphicCallStubRoutine.cpp
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+/*
+ * Copyright (C) 2015 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 "PolymorphicCallStubRoutine.h"
+
+#if ENABLE(JIT)
+
+#include "CallLinkInfo.h"
+#include "CodeBlock.h"
+#include "JSCInlines.h"
+#include "LinkBuffer.h"
+
+namespace JSC {
+
+PolymorphicCallNode::~PolymorphicCallNode()
+{
+    if (isOnList())
+        remove();
+}
+
+void PolymorphicCallNode::unlink(RepatchBuffer& repatchBuffer)
+{
+    if (m_callLinkInfo) {
+        if (Options::showDisassembly())
+            dataLog("Unlinking polymorphic call at ", m_callLinkInfo->callReturnLocation(), ", ", m_callLinkInfo->codeOrigin(), "\n");
+
+        m_callLinkInfo->unlink(repatchBuffer);
+    }
+
+    if (isOnList())
+        remove();
+}
+
+void PolymorphicCallNode::clearCallLinkInfo()
+{
+    if (Options::showDisassembly())
+        dataLog("Clearing call link info for polymorphic call at ", m_callLinkInfo->callReturnLocation(), ", ", m_callLinkInfo->codeOrigin(), "\n");
+
+    m_callLinkInfo = nullptr;
+}
+
+void PolymorphicCallCase::dump(PrintStream& out) const
+{
+    out.print("<variant = ", m_variant, ", codeBlock = ", pointerDump(m_codeBlock), ">");
+}
+
+PolymorphicCallStubRoutine::PolymorphicCallStubRoutine(
+    const MacroAssemblerCodeRef& codeRef, VM& vm, const JSCell* owner, ExecState* callerFrame,
+    CallLinkInfo& info, const Vector<PolymorphicCallCase>& cases,
+    std::unique_ptr<uint32_t[]> fastCounts)
+    : GCAwareJITStubRoutine(codeRef, vm)
+    , m_fastCounts(WTF::move(fastCounts))
+{
+    for (PolymorphicCallCase callCase : cases) {
+        m_variants.append(WriteBarrier<JSCell>(vm, owner, callCase.variant().rawCalleeCell()));
+        if (shouldShowDisassemblyFor(callerFrame->codeBlock()))
+            dataLog("Linking polymorphic call in ", *callerFrame->codeBlock(), " at ", callerFrame->codeOrigin(), " to ", callCase.variant(), ", codeBlock = ", pointerDump(callCase.codeBlock()), "\n");
+        if (CodeBlock* codeBlock = callCase.codeBlock())
+            codeBlock->linkIncomingPolymorphicCall(callerFrame, m_callNodes.add(&info));
+    }
+    m_variants.shrinkToFit();
+    WTF::storeStoreFence();
+}
+
+PolymorphicCallStubRoutine::~PolymorphicCallStubRoutine() { }
+
+CallVariantList PolymorphicCallStubRoutine::variants() const
+{
+    CallVariantList result;
+    for (size_t i = 0; i < m_variants.size(); ++i)
+        result.append(CallVariant(m_variants[i].get()));
+    return result;
+}
+
+CallEdgeList PolymorphicCallStubRoutine::edges() const
+{
+    // We wouldn't have these if this was an FTL stub routine. We shouldn't be asking for profiling
+    // from the FTL.
+    RELEASE_ASSERT(m_fastCounts);
+    
+    CallEdgeList result;
+    for (size_t i = 0; i < m_variants.size(); ++i)
+        result.append(CallEdge(CallVariant(m_variants[i].get()), m_fastCounts[i]));
+    return result;
+}
+
+void PolymorphicCallStubRoutine::clearCallNodesFor(CallLinkInfo* info)
+{
+    for (Bag<PolymorphicCallNode>::iterator iter = m_callNodes.begin(); !!iter; ++iter) {
+        PolymorphicCallNode& node = **iter;
+        // All nodes should point to info, but okay to be a little paranoid.
+        if (node.hasCallLinkInfo(info))
+            node.clearCallLinkInfo();
+    }
+}
+
+bool PolymorphicCallStubRoutine::visitWeak(RepatchBuffer&)
+{
+    for (auto& variant : m_variants) {
+        if (!Heap::isMarked(variant.get()))
+            return false;
+    }
+    return true;
+}
+
+void PolymorphicCallStubRoutine::markRequiredObjectsInternal(SlotVisitor& visitor)
+{
+    for (auto& variant : m_variants)
+        visitor.append(&variant);
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)