JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / runtime / ScopedArgumentsTable.cpp

diff --git a/runtime/ScopedArgumentsTable.cpp b/runtime/ScopedArgumentsTable.cpp
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+++ b/runtime/ScopedArgumentsTable.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 "ScopedArgumentsTable.h"
+
+#include "JSCInlines.h"
+
+namespace JSC {
+
+const ClassInfo ScopedArgumentsTable::s_info = { "ScopedArgumentsTable", 0, 0, CREATE_METHOD_TABLE(ScopedArgumentsTable) };
+
+ScopedArgumentsTable::ScopedArgumentsTable(VM& vm)
+    : Base(vm, vm.scopedArgumentsTableStructure.get())
+    , m_length(0)
+    , m_locked(false)
+{
+}
+
+ScopedArgumentsTable::~ScopedArgumentsTable()
+{
+}
+
+void ScopedArgumentsTable::destroy(JSCell* cell)
+{
+    static_cast<ScopedArgumentsTable*>(cell)->ScopedArgumentsTable::~ScopedArgumentsTable();
+}
+
+ScopedArgumentsTable* ScopedArgumentsTable::create(VM& vm)
+{
+    ScopedArgumentsTable* result =
+        new (NotNull, allocateCell<ScopedArgumentsTable>(vm.heap)) ScopedArgumentsTable(vm);
+    result->finishCreation(vm);
+    return result;
+}
+
+ScopedArgumentsTable* ScopedArgumentsTable::create(VM& vm, uint32_t length)
+{
+    ScopedArgumentsTable* result = create(vm);
+    result->m_length = length;
+    result->m_arguments = std::make_unique<ScopeOffset[]>(length);
+    return result;
+}
+
+ScopedArgumentsTable* ScopedArgumentsTable::clone(VM& vm)
+{
+    ScopedArgumentsTable* result = create(vm, m_length);
+    for (unsigned i = m_length; i--;)
+        result->m_arguments[i] = m_arguments[i];
+    return result;
+}
+
+ScopedArgumentsTable* ScopedArgumentsTable::setLength(VM& vm, uint32_t newLength)
+{
+    if (LIKELY(!m_locked)) {
+        std::unique_ptr<ScopeOffset[]> newArguments = std::make_unique<ScopeOffset[]>(newLength);
+        for (unsigned i = std::min(m_length, newLength); i--;)
+            newArguments[i] = m_arguments[i];
+        m_length = newLength;
+        m_arguments = WTF::move(newArguments);
+        return this;
+    }
+    
+    ScopedArgumentsTable* result = create(vm, newLength);
+    for (unsigned i = std::min(m_length, newLength); i--;)
+        result->m_arguments[i] = m_arguments[i];
+    return result;
+}
+
+ScopedArgumentsTable* ScopedArgumentsTable::set(VM& vm, uint32_t i, ScopeOffset value)
+{
+    ScopedArgumentsTable* result;
+    if (UNLIKELY(m_locked))
+        result = clone(vm);
+    else
+        result = this;
+    result->at(i) = value;
+    return result;
+}
+
+Structure* ScopedArgumentsTable::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+{
+    return Structure::create(vm, globalObject, prototype, TypeInfo(CellType, StructureFlags), info());
+}
+
+} // namespace JSC
+