1 | /* |
2 | * Copyright (C) 2008 Apple Inc. All rights reserved. |
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 | * 1. Redistributions of source code must retain the above copyright |
8 | * notice, this list of conditions and the following disclaimer. |
9 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
24 | */ |
25 | |
26 | #ifndef AssemblerBuffer_h |
27 | #define AssemblerBuffer_h |
28 | |
29 | #include <wtf/Platform.h> |
30 | |
31 | #if ENABLE(ASSEMBLER) |
32 | |
33 | #include "stdint.h" |
34 | #include <string.h> |
35 | #include <jit/ExecutableAllocator.h> |
36 | #include <wtf/Assertions.h> |
37 | #include <wtf/FastMalloc.h> |
38 | |
39 | namespace JSC { |
40 | |
41 | class AssemblerBuffer { |
42 | static const int inlineCapacity = 256; |
43 | public: |
44 | AssemblerBuffer() |
45 | : m_buffer(m_inlineBuffer) |
46 | , m_capacity(inlineCapacity) |
47 | , m_size(0) |
48 | { |
49 | } |
50 | |
51 | ~AssemblerBuffer() |
52 | { |
53 | if (m_buffer != m_inlineBuffer) |
54 | fastFree(m_buffer); |
55 | } |
56 | |
57 | void ensureSpace(int space) |
58 | { |
59 | if (m_size > m_capacity - space) |
60 | grow(); |
61 | } |
62 | |
63 | bool isAligned(int alignment) const |
64 | { |
65 | return !(m_size & (alignment - 1)); |
66 | } |
67 | |
68 | void putByteUnchecked(int value) |
69 | { |
70 | ASSERT(!(m_size > m_capacity - 4)); |
71 | m_buffer[m_size] = value; |
72 | m_size++; |
73 | } |
74 | |
75 | void putByte(int value) |
76 | { |
77 | if (m_size > m_capacity - 4) |
78 | grow(); |
79 | putByteUnchecked(value); |
80 | } |
81 | |
82 | void putShortUnchecked(int value) |
83 | { |
84 | ASSERT(!(m_size > m_capacity - 4)); |
85 | *reinterpret_cast<short*>(&m_buffer[m_size]) = value; |
86 | m_size += 2; |
87 | } |
88 | |
89 | void putShort(int value) |
90 | { |
91 | if (m_size > m_capacity - 4) |
92 | grow(); |
93 | putShortUnchecked(value); |
94 | } |
95 | |
96 | void putIntUnchecked(int value) |
97 | { |
98 | ASSERT(!(m_size > m_capacity - 4)); |
99 | *reinterpret_cast<int*>(&m_buffer[m_size]) = value; |
100 | m_size += 4; |
101 | } |
102 | |
103 | void putInt64Unchecked(int64_t value) |
104 | { |
105 | ASSERT(!(m_size > m_capacity - 8)); |
106 | *reinterpret_cast<int64_t*>(&m_buffer[m_size]) = value; |
107 | m_size += 8; |
108 | } |
109 | |
110 | void putInt(int value) |
111 | { |
112 | if (m_size > m_capacity - 4) |
113 | grow(); |
114 | putIntUnchecked(value); |
115 | } |
116 | |
117 | void* data() const |
118 | { |
119 | return m_buffer; |
120 | } |
121 | |
122 | int size() const |
123 | { |
124 | return m_size; |
125 | } |
126 | |
127 | void* executableCopy(ExecutablePool* allocator) |
128 | { |
129 | if (!m_size) |
130 | return 0; |
131 | |
132 | void* result = allocator->alloc(n: m_size); |
133 | |
134 | if (!result) |
135 | return 0; |
136 | |
137 | ExecutableAllocator::makeWritable(result, m_size); |
138 | |
139 | return memcpy(dest: result, src: m_buffer, n: m_size); |
140 | } |
141 | |
142 | protected: |
143 | void append(const char* data, int size) |
144 | { |
145 | if (m_size > m_capacity - size) |
146 | grow(extraCapacity: size); |
147 | |
148 | memcpy(dest: m_buffer + m_size, src: data, n: size); |
149 | m_size += size; |
150 | } |
151 | |
152 | void grow(int = 0) |
153 | { |
154 | m_capacity += m_capacity / 2 + extraCapacity; |
155 | |
156 | if (m_buffer == m_inlineBuffer) { |
157 | char* newBuffer = static_cast<char*>(fastMalloc(m_capacity)); |
158 | m_buffer = static_cast<char*>(memcpy(dest: newBuffer, src: m_buffer, n: m_size)); |
159 | } else |
160 | m_buffer = static_cast<char*>(fastRealloc(m_buffer, m_capacity)); |
161 | } |
162 | |
163 | char m_inlineBuffer[inlineCapacity]; |
164 | char* m_buffer; |
165 | int m_capacity; |
166 | int m_size; |
167 | }; |
168 | |
169 | } // namespace JSC |
170 | |
171 | #endif // ENABLE(ASSEMBLER) |
172 | |
173 | #endif // AssemblerBuffer_h |
174 | |