1/*
2 * Copyright (C) 2015 The Qt Company Ltd
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "config.h"
30
31#if OS(SYMBIAN)
32
33#include "RegisterFileAllocatorSymbian.h"
34
35namespace WTF {
36
37/** Efficiently allocates memory pools of size poolSize.
38 * Primarily designed for JSC RegisterFile's needs.
39 * Not thread-safe.
40 */
41RegisterFileAllocator::RegisterFileAllocator(TUint32 reservationSize, TUint32 poolSize) :
42 m_reserved(reservationSize), m_poolSize(poolSize)
43{
44 // Get system's page size value.
45 SYMBIAN_PAGESIZE(m_pageSize);
46
47 // We only accept multiples of system page size for both initial reservation
48 // and the alignment/pool size
49 m_reserved = SYMBIAN_ROUNDUPTOMULTIPLE(m_reserved, m_pageSize);
50 __ASSERT_ALWAYS(SYMBIAN_ROUNDUPTOMULTIPLE(m_poolSize, m_pageSize),
51 User::Panic(_L("RegisterFileAllocator1"), KErrArgument));
52
53 // Open a Symbian RChunk, and reserve requested virtual address range
54 // Any thread in this process can operate this RChunk due to EOwnerProcess access rights.
55 TInt ret = m_chunk.CreateDisconnectedLocal(0 , 0, (TInt)m_reserved , EOwnerProcess);
56 if (ret != KErrNone)
57 User::Panic(_L("RegisterFileAllocator2"), ret);
58
59 m_buffer = (void*)m_chunk.Base();
60 m_resEnd = (void*)(m_chunk.Base() + m_chunk.MaxSize());
61 m_comEnd = m_buffer;
62}
63
64RegisterFileAllocator::~RegisterFileAllocator()
65{
66 // release everything!
67 m_chunk.Decommit(0, m_chunk.MaxSize());
68 m_chunk.Close();
69}
70
71void* RegisterFileAllocator::buffer() const
72{
73 return m_buffer;
74}
75
76void RegisterFileAllocator::grow(void* newEnd)
77{
78 // trying to commit more memory than reserved!
79 if (newEnd > m_resEnd)
80 return;
81
82 if (newEnd > m_comEnd) {
83 TInt nBytes = (TInt)(newEnd) - (TInt)(m_comEnd);
84 nBytes = SYMBIAN_ROUNDUPTOMULTIPLE(nBytes, m_poolSize);
85 TInt offset = (TInt)m_comEnd - (TInt)m_buffer;
86 // The reserved size is not guaranteed to be a multiple of the pool size.
87 TInt maxBytes = (TInt)m_resEnd - (TInt)m_comEnd;
88 if (nBytes > maxBytes)
89 nBytes = maxBytes;
90
91 TInt ret = m_chunk.Commit(offset, nBytes);
92 if (ret == KErrNone)
93 m_comEnd = (void*)(m_chunk.Base() + m_chunk.Size());
94 else
95 CRASH();
96 }
97}
98
99void RegisterFileAllocator::shrink(void* newEnd)
100{
101 if (newEnd < m_comEnd) {
102 TInt nBytes = (TInt)newEnd - (TInt)m_comEnd;
103 if (nBytes >= m_poolSize) {
104 TInt offset = SYMBIAN_ROUNDUPTOMULTIPLE((TUint)newEnd, m_poolSize) - (TInt)m_buffer;
105 nBytes = (TInt)m_comEnd - offset - (TInt)m_buffer;
106 if (nBytes > 0) {
107 TInt ret = m_chunk.Decommit(offset, nBytes);
108 if (ret == KErrNone)
109 m_comEnd = (void*)(m_chunk.Base() + m_chunk.Size());
110 }
111 }
112 }
113}
114
115} // end of namespace
116
117#endif // SYMBIAN
118

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/RegisterFileAllocatorSymbian.cpp