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1 | /* |
2 | * Copyright (C) 2010 Apple Inc. All rights reserved. | |
3 | * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
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 | * | |
14 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' | |
15 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
16 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
17 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS | |
18 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
19 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
20 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
21 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
22 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
23 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | |
24 | * THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include "config.h" | |
28 | #include "OSAllocator.h" | |
29 | ||
30 | #include "PageAllocatorSymbian.h" | |
31 | ||
32 | namespace WTF { | |
33 | ||
34 | // Array to store code chunks used by JIT engine(s) | |
35 | static RPointerArray<SymbianChunk> codeChunksContainer; | |
36 | ||
37 | // The singleton data allocator (non code) | |
38 | static PageAllocatorSymbian dataAllocator; | |
39 | ||
40 | _LIT(KErrorStringInternalConsistency, "OSAllocator:ConsistencyError"); | |
41 | _LIT(KErrorStringChunkCreation, "OSAllocator:ChunkInitError"); | |
42 | _LIT(KErrorStringPageSize, "OSAllocator:WrongPageSize"); | |
43 | ||
44 | // Makes a new code chunk for a JIT engine with everything in committed state | |
45 | static void* allocateCodeChunk(size_t bytes) | |
46 | { | |
47 | RChunk c; | |
48 | TInt error = c.CreateLocalCode(bytes, bytes); | |
49 | __ASSERT_ALWAYS(error == KErrNone, User::Panic(KErrorStringChunkCreation, error)); | |
50 | ||
51 | codeChunksContainer.Append(new SymbianChunk(c.Handle())); | |
52 | return static_cast<void*>(c.Base()); | |
53 | } | |
54 | ||
55 | // Frees the _entire_ code chunk in which this address resides. | |
56 | static bool deallocateCodeChunk(void* address) | |
57 | { | |
58 | bool found = false; | |
59 | for (int i = 0; i < codeChunksContainer.Count(); i++) { | |
60 | SymbianChunk* p = codeChunksContainer[i]; | |
61 | if (p && p->contains(address)) { | |
62 | codeChunksContainer.Remove(i); | |
63 | delete p; | |
64 | found = true; | |
65 | } | |
66 | } | |
67 | return found; | |
68 | } | |
69 | ||
70 | // Return the (singleton) object that manages all non-code VM operations | |
71 | static PageAllocatorSymbian* dataAllocatorInstance() | |
72 | { | |
73 | return &dataAllocator; | |
74 | } | |
75 | ||
76 | // Reserve memory and return the base address of the region | |
77 | void* OSAllocator::reserveUncommitted(size_t reservationSize, Usage usage, bool , bool executable, bool) | |
78 | { | |
79 | void* base = 0; | |
80 | if (executable) | |
81 | base = allocateCodeChunk(reservationSize); | |
82 | else | |
83 | base = dataAllocatorInstance()->reserve(reservationSize); | |
84 | return base; | |
85 | } | |
86 | ||
87 | // Inverse operation of reserveUncommitted() | |
88 | void OSAllocator::releaseDecommitted(void* parkedBase, size_t bytes) | |
89 | { | |
90 | if (dataAllocatorInstance()->contains(parkedBase)) | |
91 | dataAllocatorInstance()->release(parkedBase, bytes); | |
92 | ||
93 | // NOOP for code chunks (JIT) because we released them in decommit() | |
94 | } | |
95 | ||
96 | // Commit what was previously reserved via reserveUncommitted() | |
97 | void OSAllocator::commit(void* address, size_t bytes, bool, bool executable) | |
98 | { | |
99 | // For code chunks, we commit (early) in reserveUncommitted(), so NOOP | |
100 | // For data regions, do real work | |
101 | if (!executable) | |
102 | dataAllocatorInstance()->commit(address, bytes); | |
103 | } | |
104 | ||
105 | void OSAllocator::decommit(void* address, size_t bytes) | |
106 | { | |
107 | if (dataAllocatorInstance()->contains(address)) | |
108 | dataAllocatorInstance()->decommit(address, bytes); | |
109 | else | |
110 | deallocateCodeChunk(address); // for code chunk, decommit AND release | |
111 | } | |
112 | ||
113 | void* OSAllocator::reserveAndCommit(size_t bytes, Usage usage, bool writable, bool executable, bool) | |
114 | { | |
115 | void* base = reserveUncommitted(bytes, usage, writable, executable); | |
116 | commit(base, bytes, writable, executable); | |
117 | return base; | |
118 | } | |
119 | ||
120 | ||
121 | // The PageAllocatorSymbian class helps map OSAllocator calls for reserve/commit/decommit | |
122 | // to a single large Symbian chunk. Only works with multiples of page size, and as a corollary | |
123 | // all addresses accepted or returned by it are also page-sized aligned. | |
124 | // Design notes: | |
125 | // - We initialize a chunk up-front with a large reservation size | |
126 | // - The entire reservation reserve is logically divided into pageSized blocks (4K on Symbian) | |
127 | // - The map maintains 1 bit for each of the 4K-sized region in our address space | |
128 | // - OSAllocator::reserveUncommitted() requests lead to 1 or more bits being set in map | |
129 | // to indicate internally reserved state. The VM address corresponding to the first bit is returned. | |
130 | // - OSAllocator::commit() actually calls RChunk.commit() and commits *all or part* of the region | |
131 | // reserved via reserveUncommitted() previously. | |
132 | // - OSAllocator::decommit() calls RChunk.decommit() | |
133 | // - OSAllocator::releaseDecommitted() unparks all the bits in the map, but trusts that a previously | |
134 | // call to decommit() would have returned the memory to the OS | |
135 | PageAllocatorSymbian::PageAllocatorSymbian() | |
136 | { | |
137 | __ASSERT_ALWAYS(m_pageSize == WTF::pageSize(), User::Panic(KErrorStringPageSize, m_pageSize)); | |
138 | ||
139 | RChunk chunk; | |
140 | TInt error = chunk.CreateDisconnectedLocal(0, 0, TInt(largeReservationSize)); | |
141 | __ASSERT_ALWAYS(error == KErrNone, User::Panic(KErrorStringChunkCreation, error)); | |
142 | ||
143 | m_chunk = new SymbianChunk(chunk.Handle()); // takes ownership of chunk | |
144 | } | |
145 | ||
146 | PageAllocatorSymbian::~PageAllocatorSymbian() | |
147 | { | |
148 | delete m_chunk; | |
149 | } | |
150 | ||
151 | // Reserves a region internally in the bitmap | |
152 | void* PageAllocatorSymbian::reserve(size_t bytes) | |
153 | { | |
154 | // Find first available region | |
155 | const size_t nPages = bytes / m_pageSize; | |
156 | const int64_t startIdx = m_map.findRunOfZeros(nPages); | |
157 | ||
158 | // Pseudo OOM | |
159 | if (startIdx < 0) | |
160 | return 0; | |
161 | ||
162 | for (size_t i = startIdx; i < startIdx + nPages ; i++) | |
163 | m_map.set(i); | |
164 | ||
165 | return static_cast<void*>( m_chunk->m_base + (TUint)(m_pageSize * startIdx) ); | |
166 | } | |
167 | ||
168 | // Reverses the effects of a reserve() call | |
169 | void PageAllocatorSymbian::release(void* address, size_t bytes) | |
170 | { | |
171 | const size_t startIdx = (static_cast<char*>(address) - m_chunk->m_base) / m_pageSize; | |
172 | const size_t nPages = bytes / m_pageSize; | |
173 | for (size_t i = startIdx; i < startIdx + nPages ; i++) | |
174 | m_map.clear(i); | |
175 | } | |
176 | ||
177 | // Actually commit memory from the OS, after a previous call to reserve() | |
178 | bool PageAllocatorSymbian::commit(void* address, size_t bytes) | |
179 | { | |
180 | // sanity check that bits were previously set | |
181 | const size_t idx = (static_cast<char*>(address) - m_chunk->m_base) / m_pageSize; | |
182 | const size_t nPages = bytes / m_pageSize; | |
183 | __ASSERT_ALWAYS(m_map.get(idx), User::Panic(KErrorStringInternalConsistency, idx)); | |
184 | __ASSERT_ALWAYS(m_map.get(idx+nPages-1), User::Panic(KErrorStringInternalConsistency, idx+nPages-1)); | |
185 | ||
186 | TInt error = m_chunk->Commit(static_cast<char*>(address) - m_chunk->m_base, bytes); | |
187 | return (error == KErrNone); | |
188 | } | |
189 | ||
190 | // Inverse operation of commit(), a release() should follow later | |
191 | bool PageAllocatorSymbian::decommit(void* address, size_t bytes) | |
192 | { | |
193 | TInt error = m_chunk->Decommit(static_cast<char*>(address) - m_chunk->m_base, bytes); | |
194 | return (error == KErrNone); | |
195 | } | |
196 | ||
197 | bool PageAllocatorSymbian::contains(const void* address) const | |
198 | { | |
199 | return m_chunk->contains(address); | |
200 | } | |
201 | ||
202 | } // namespace WTF |