|
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 #if ENABLE(ASSEMBLER) |
|
30 |
|
31 #include "stdint.h" |
|
32 #include <string.h> |
|
33 #include <jit/ExecutableAllocator.h> |
|
34 #include <wtf/Assertions.h> |
|
35 #include <wtf/FastMalloc.h> |
|
36 |
|
37 namespace JSC { |
|
38 |
|
39 class AssemblerBuffer { |
|
40 static const int inlineCapacity = 128 - sizeof(char*) - 2 * sizeof(int); |
|
41 public: |
|
42 AssemblerBuffer() |
|
43 : m_buffer(m_inlineBuffer) |
|
44 , m_capacity(inlineCapacity) |
|
45 , m_size(0) |
|
46 { |
|
47 COMPILE_ASSERT(sizeof(AssemblerBuffer) == 128, AssemblerBuffer_should_be_128_bytes); |
|
48 } |
|
49 |
|
50 ~AssemblerBuffer() |
|
51 { |
|
52 if (m_buffer != m_inlineBuffer) |
|
53 fastFree(m_buffer); |
|
54 } |
|
55 |
|
56 void ensureSpace(int space) |
|
57 { |
|
58 if (m_size > m_capacity - space) |
|
59 grow(); |
|
60 } |
|
61 |
|
62 bool isAligned(int alignment) const |
|
63 { |
|
64 return !(m_size & (alignment - 1)); |
|
65 } |
|
66 |
|
67 void putByteUnchecked(int value) |
|
68 { |
|
69 ASSERT(!(m_size > m_capacity - 4)); |
|
70 m_buffer[m_size] = value; |
|
71 m_size++; |
|
72 } |
|
73 |
|
74 void putByte(int value) |
|
75 { |
|
76 if (m_size > m_capacity - 4) |
|
77 grow(); |
|
78 putByteUnchecked(value); |
|
79 } |
|
80 |
|
81 void putShortUnchecked(int value) |
|
82 { |
|
83 ASSERT(!(m_size > m_capacity - 4)); |
|
84 *reinterpret_cast<short*>(&m_buffer[m_size]) = value; |
|
85 m_size += 2; |
|
86 } |
|
87 |
|
88 void putShort(int value) |
|
89 { |
|
90 if (m_size > m_capacity - 4) |
|
91 grow(); |
|
92 putShortUnchecked(value); |
|
93 } |
|
94 |
|
95 void putIntUnchecked(int value) |
|
96 { |
|
97 ASSERT(!(m_size > m_capacity - 4)); |
|
98 *reinterpret_cast<int*>(&m_buffer[m_size]) = value; |
|
99 m_size += 4; |
|
100 } |
|
101 |
|
102 void putInt64Unchecked(int64_t value) |
|
103 { |
|
104 ASSERT(!(m_size > m_capacity - 8)); |
|
105 *reinterpret_cast<int64_t*>(&m_buffer[m_size]) = value; |
|
106 m_size += 8; |
|
107 } |
|
108 |
|
109 void putInt(int value) |
|
110 { |
|
111 if (m_size > m_capacity - 4) |
|
112 grow(); |
|
113 putIntUnchecked(value); |
|
114 } |
|
115 |
|
116 void* data() const |
|
117 { |
|
118 return m_buffer; |
|
119 } |
|
120 |
|
121 int size() const |
|
122 { |
|
123 return m_size; |
|
124 } |
|
125 |
|
126 void* executableCopy(ExecutablePool* allocator) |
|
127 { |
|
128 if (!m_size) |
|
129 return 0; |
|
130 |
|
131 void* result = allocator->alloc(m_size); |
|
132 |
|
133 if (!result) |
|
134 return 0; |
|
135 |
|
136 ExecutableAllocator::makeWritable(result, m_size); |
|
137 |
|
138 return memcpy(result, m_buffer, m_size); |
|
139 } |
|
140 |
|
141 protected: |
|
142 void append(const char* data, int size) |
|
143 { |
|
144 if (m_size > m_capacity - size) |
|
145 grow(size); |
|
146 |
|
147 memcpy(m_buffer + m_size, data, size); |
|
148 m_size += size; |
|
149 } |
|
150 |
|
151 void grow(int extraCapacity = 0) |
|
152 { |
|
153 m_capacity += m_capacity / 2 + extraCapacity; |
|
154 |
|
155 if (m_buffer == m_inlineBuffer) { |
|
156 char* newBuffer = static_cast<char*>(fastMalloc(m_capacity)); |
|
157 m_buffer = static_cast<char*>(memcpy(newBuffer, m_buffer, m_size)); |
|
158 } else |
|
159 m_buffer = static_cast<char*>(fastRealloc(m_buffer, m_capacity)); |
|
160 } |
|
161 |
|
162 char m_inlineBuffer[inlineCapacity]; |
|
163 char* m_buffer; |
|
164 int m_capacity; |
|
165 int m_size; |
|
166 }; |
|
167 |
|
168 } // namespace JSC |
|
169 |
|
170 #endif // ENABLE(ASSEMBLER) |
|
171 |
|
172 #endif // AssemblerBuffer_h |