+++ /dev/null
-/*
- * Copyright (C) 2009 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.
- */
-
-#ifndef MarkStack_h
-#define MarkStack_h
-
-#include "JSValue.h"
-#include <wtf/Noncopyable.h>
-
-namespace JSC {
-
- class JSGlobalData;
- class Register;
-
- enum MarkSetProperties { MayContainNullValues, NoNullValues };
-
- class MarkStack : Noncopyable {
- public:
- MarkStack(void* jsArrayVPtr)
- : m_jsArrayVPtr(jsArrayVPtr)
-#ifndef NDEBUG
- , m_isCheckingForDefaultMarkViolation(false)
-#endif
- {
- }
-
- ALWAYS_INLINE void append(JSValue);
- void append(JSCell*);
-
- ALWAYS_INLINE void appendValues(Register* values, size_t count, MarkSetProperties properties = NoNullValues)
- {
- appendValues(reinterpret_cast<JSValue*>(values), count, properties);
- }
-
- ALWAYS_INLINE void appendValues(JSValue* values, size_t count, MarkSetProperties properties = NoNullValues)
- {
- if (count)
- m_markSets.append(MarkSet(values, values + count, properties));
- }
-
- inline void drain();
- void compact();
-
- ~MarkStack()
- {
- ASSERT(m_markSets.isEmpty());
- ASSERT(m_values.isEmpty());
- }
-
- private:
- void markChildren(JSCell*);
-
- struct MarkSet {
- MarkSet(JSValue* values, JSValue* end, MarkSetProperties properties)
- : m_values(values)
- , m_end(end)
- , m_properties(properties)
- {
- ASSERT(values);
- }
- JSValue* m_values;
- JSValue* m_end;
- MarkSetProperties m_properties;
- };
-
- static void* allocateStack(size_t size);
- static void releaseStack(void* addr, size_t size);
-
- static void initializePagesize();
- static size_t pageSize()
- {
- if (!s_pageSize)
- initializePagesize();
- return s_pageSize;
- }
-
- template <typename T> struct MarkStackArray {
- MarkStackArray()
- : m_top(0)
- , m_allocated(MarkStack::pageSize())
- , m_capacity(m_allocated / sizeof(T))
- {
- m_data = reinterpret_cast<T*>(allocateStack(m_allocated));
- }
-
- ~MarkStackArray()
- {
- releaseStack(m_data, m_allocated);
- }
-
- void expand()
- {
- size_t oldAllocation = m_allocated;
- m_allocated *= 2;
- m_capacity = m_allocated / sizeof(T);
- void* newData = allocateStack(m_allocated);
- memcpy(newData, m_data, oldAllocation);
- releaseStack(m_data, oldAllocation);
- m_data = reinterpret_cast<T*>(newData);
- }
-
- inline void append(const T& v)
- {
- if (m_top == m_capacity)
- expand();
- m_data[m_top++] = v;
- }
-
- inline T removeLast()
- {
- ASSERT(m_top);
- return m_data[--m_top];
- }
-
- inline T& last()
- {
- ASSERT(m_top);
- return m_data[m_top - 1];
- }
-
- inline bool isEmpty()
- {
- return m_top == 0;
- }
-
- inline size_t size() { return m_top; }
-
- inline void shrinkAllocation(size_t size)
- {
- ASSERT(size <= m_allocated);
- ASSERT(0 == (size % MarkStack::pageSize()));
- if (size == m_allocated)
- return;
-#if OS(WINDOWS) || OS(SYMBIAN) || PLATFORM(BREWMP)
- // We cannot release a part of a region with VirtualFree. To get around this,
- // we'll release the entire region and reallocate the size that we want.
- releaseStack(m_data, m_allocated);
- m_data = reinterpret_cast<T*>(allocateStack(size));
-#else
- releaseStack(reinterpret_cast<char*>(m_data) + size, m_allocated - size);
-#endif
- m_allocated = size;
- m_capacity = m_allocated / sizeof(T);
- }
-
- private:
- size_t m_top;
- size_t m_allocated;
- size_t m_capacity;
- T* m_data;
- };
-
- void* m_jsArrayVPtr;
- MarkStackArray<MarkSet> m_markSets;
- MarkStackArray<JSCell*> m_values;
- static size_t s_pageSize;
-
-#ifndef NDEBUG
- public:
- bool m_isCheckingForDefaultMarkViolation;
-#endif
- };
-}
-
-#endif
projects / apple / javascriptcore.git / blobdiff