JavaScriptCore-7601.1.46.3.tar.gz

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

diff --git a/bytecode/ConstantStructureCheck.cpp b/bytecode/ConstantStructureCheck.cpp
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+++ b/bytecode/ConstantStructureCheck.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 "ConstantStructureCheck.h"
+
+#include "JSCInlines.h"
+
+namespace JSC {
+
+void ConstantStructureCheck::dumpInContext(PrintStream& out, DumpContext* context) const
+{
+    out.print(
+        "(Check if ", inContext(JSValue(m_constant), context), " has structure ",
+        pointerDumpInContext(m_structure, context), ")");
+}
+
+void ConstantStructureCheck::dump(PrintStream& out) const
+{
+    dumpInContext(out, nullptr);
+}
+
+Structure* structureFor(const ConstantStructureCheckVector& vector, JSCell* constant)
+{
+    for (unsigned i = vector.size(); i--;) {
+        if (vector[i].constant() == constant)
+            return vector[i].structure();
+    }
+    return nullptr;
+}
+
+bool areCompatible(const ConstantStructureCheckVector& a, const ConstantStructureCheckVector& b)
+{
+    for (unsigned i = a.size(); i--;) {
+        Structure* otherStructure = structureFor(b, a[i].constant());
+        if (!otherStructure)
+            continue;
+        if (a[i].structure() != otherStructure)
+            return false;
+    }
+    return true;
+}
+
+void mergeInto(const ConstantStructureCheckVector& source, ConstantStructureCheckVector& target)
+{
+    for (unsigned i = source.size(); i--;) {
+        if (structureFor(target, source[i].constant()))
+            continue;
+        target.append(source[i]);
+    }
+}
+
+} // namespace JSC
+