JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / dfg / DFGArgumentsUtilities.cpp

diff --git a/dfg/DFGArgumentsUtilities.cpp b/dfg/DFGArgumentsUtilities.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 "DFGArgumentsUtilities.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "JSCInlines.h"
+
+namespace JSC { namespace DFG {
+
+bool argumentsInvolveStackSlot(InlineCallFrame* inlineCallFrame, VirtualRegister reg)
+{
+    if (!inlineCallFrame)
+        return (reg.isArgument() && reg.toArgument()) || reg.isHeader();
+    
+    if (inlineCallFrame->isClosureCall
+        && reg == VirtualRegister(inlineCallFrame->stackOffset + JSStack::Callee))
+        return true;
+    
+    if (inlineCallFrame->isVarargs()
+        && reg == VirtualRegister(inlineCallFrame->stackOffset + JSStack::ArgumentCount))
+        return true;
+    
+    unsigned numArguments = inlineCallFrame->arguments.size() - 1;
+    VirtualRegister argumentStart =
+        VirtualRegister(inlineCallFrame->stackOffset) + CallFrame::argumentOffset(0);
+    return reg >= argumentStart && reg < argumentStart + numArguments;
+}
+
+bool argumentsInvolveStackSlot(Node* candidate, VirtualRegister reg)
+{
+    return argumentsInvolveStackSlot(candidate->origin.semantic.inlineCallFrame, reg);
+}
+
+Node* emitCodeToGetArgumentsArrayLength(
+    InsertionSet& insertionSet, Node* arguments, unsigned nodeIndex, NodeOrigin origin)
+{
+    Graph& graph = insertionSet.graph();
+
+    DFG_ASSERT(
+        graph, arguments,
+        arguments->op() == CreateDirectArguments || arguments->op() == CreateScopedArguments
+        || arguments->op() == CreateClonedArguments || arguments->op() == PhantomDirectArguments
+        || arguments->op() == PhantomClonedArguments);
+    
+    InlineCallFrame* inlineCallFrame = arguments->origin.semantic.inlineCallFrame;
+    
+    if (inlineCallFrame && !inlineCallFrame->isVarargs()) {
+        return insertionSet.insertConstant(
+            nodeIndex, origin, jsNumber(inlineCallFrame->arguments.size() - 1));
+    }
+    
+    Node* argumentCount;
+    if (!inlineCallFrame)
+        argumentCount = insertionSet.insertNode(nodeIndex, SpecInt32, GetArgumentCount, origin);
+    else {
+        VirtualRegister argumentCountRegister(inlineCallFrame->stackOffset + JSStack::ArgumentCount);
+        
+        argumentCount = insertionSet.insertNode(
+            nodeIndex, SpecInt32, GetStack, origin,
+            OpInfo(graph.m_stackAccessData.add(argumentCountRegister, FlushedInt32)));
+    }
+    
+    return insertionSet.insertNode(
+        nodeIndex, SpecInt32, ArithSub, origin, OpInfo(Arith::Unchecked),
+        Edge(argumentCount, Int32Use),
+        insertionSet.insertConstantForUse(
+            nodeIndex, origin, jsNumber(1), Int32Use));
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+