JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / bytecode / ComplexGetStatus.cpp

diff --git a/bytecode/ComplexGetStatus.cpp b/bytecode/ComplexGetStatus.cpp
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+++ b/bytecode/ComplexGetStatus.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 "ComplexGetStatus.h"
+
+#include "JSCInlines.h"
+
+namespace JSC {
+
+ComplexGetStatus ComplexGetStatus::computeFor(
+    CodeBlock* profiledBlock, Structure* headStructure, StructureChain* chain,
+    unsigned chainCount, UniquedStringImpl* uid)
+{
+    // FIXME: We should assert that we never see a structure that
+    // hasImpureGetOwnPropertySlot() but for which we don't
+    // newImpurePropertyFiresWatchpoints(). We're not at a point where we can do
+    // that, yet.
+    // https://bugs.webkit.org/show_bug.cgi?id=131810
+    
+    if (headStructure->takesSlowPathInDFGForImpureProperty())
+        return takesSlowPath();
+    
+    ComplexGetStatus result;
+    result.m_kind = Inlineable;
+    
+    if (chain && chainCount) {
+        result.m_chain = adoptRef(new IntendedStructureChain(
+            profiledBlock, headStructure, chain, chainCount));
+        
+        if (!result.m_chain->isStillValid())
+            return skip();
+        
+        if (headStructure->takesSlowPathInDFGForImpureProperty()
+            || result.m_chain->takesSlowPathInDFGForImpureProperty())
+            return takesSlowPath();
+        
+        JSObject* currentObject = result.m_chain->terminalPrototype();
+        Structure* currentStructure = result.m_chain->last();
+        
+        ASSERT_UNUSED(currentObject, currentObject);
+        
+        result.m_offset = currentStructure->getConcurrently(uid, result.m_attributes);
+    } else {
+        result.m_offset = headStructure->getConcurrently(uid, result.m_attributes);
+    }
+    
+    if (!isValidOffset(result.m_offset))
+        return takesSlowPath();
+    
+    return result;
+}
+
+} // namespace JSC
+
+