author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 01:32:07 +0300 | |
changeset 2 | 303757a437d3 |
parent 0 | 4f2f89ce4247 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (C) 2009 University of Szeged |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL UNIVERSITY OF SZEGED OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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|
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#ifndef AssemblerBufferWithConstantPool_h |
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#define AssemblerBufferWithConstantPool_h |
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#if ENABLE(ASSEMBLER) |
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#include "AssemblerBuffer.h" |
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#include <wtf/SegmentedVector.h> |
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#define ASSEMBLER_HAS_CONSTANT_POOL 1 |
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namespace JSC { |
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/* |
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On a constant pool 4 or 8 bytes data can be stored. The values can be |
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constants or addresses. The addresses should be 32 or 64 bits. The constants |
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should be double-precisions float or integer numbers which are hard to be |
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encoded as few machine instructions. |
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TODO: The pool is desinged to handle both 32 and 64 bits values, but |
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currently only the 4 bytes constants are implemented and tested. |
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The AssemblerBuffer can contain multiple constant pools. Each pool is inserted |
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into the instruction stream - protected by a jump instruction from the |
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execution flow. |
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The flush mechanism is called when no space remain to insert the next instruction |
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into the pool. Three values are used to determine when the constant pool itself |
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have to be inserted into the instruction stream (Assembler Buffer): |
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- maxPoolSize: size of the constant pool in bytes, this value cannot be |
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larger than the maximum offset of a PC relative memory load |
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- barrierSize: size of jump instruction in bytes which protects the |
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constant pool from execution |
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- maxInstructionSize: maximum length of a machine instruction in bytes |
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There are some callbacks which solve the target architecture specific |
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address handling: |
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- TYPE patchConstantPoolLoad(TYPE load, int value): |
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patch the 'load' instruction with the index of the constant in the |
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constant pool and return the patched instruction. |
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- void patchConstantPoolLoad(void* loadAddr, void* constPoolAddr): |
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patch the a PC relative load instruction at 'loadAddr' address with the |
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final relative offset. The offset can be computed with help of |
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'constPoolAddr' (the address of the constant pool) and index of the |
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constant (which is stored previously in the load instruction itself). |
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- TYPE placeConstantPoolBarrier(int size): |
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return with a constant pool barrier instruction which jumps over the |
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constant pool. |
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The 'put*WithConstant*' functions should be used to place a data into the |
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constant pool. |
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*/ |
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template <int maxPoolSize, int barrierSize, int maxInstructionSize, class AssemblerType> |
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class AssemblerBufferWithConstantPool: public AssemblerBuffer { |
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typedef SegmentedVector<uint32_t, 512> LoadOffsets; |
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public: |
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enum { |
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UniqueConst, |
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ReusableConst, |
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UnusedEntry, |
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}; |
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AssemblerBufferWithConstantPool() |
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: AssemblerBuffer() |
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, m_numConsts(0) |
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, m_maxDistance(maxPoolSize) |
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, m_lastConstDelta(0) |
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{ |
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m_pool = static_cast<uint32_t*>(fastMalloc(maxPoolSize)); |
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|
102 |
m_mask = static_cast<char*>(fastMalloc(maxPoolSize / sizeof(uint32_t))); |
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|
103 |
} |
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|
104 |
|
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105 |
~AssemblerBufferWithConstantPool() |
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|
106 |
{ |
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|
107 |
fastFree(m_mask); |
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108 |
fastFree(m_pool); |
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109 |
} |
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|
110 |
|
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111 |
void ensureSpace(int space) |
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112 |
{ |
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113 |
flushIfNoSpaceFor(space); |
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114 |
AssemblerBuffer::ensureSpace(space); |
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115 |
} |
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116 |
|
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117 |
void ensureSpace(int insnSpace, int constSpace) |
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118 |
{ |
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119 |
flushIfNoSpaceFor(insnSpace, constSpace); |
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120 |
AssemblerBuffer::ensureSpace(insnSpace); |
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121 |
} |
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122 |
|
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bool isAligned(int alignment) |
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124 |
{ |
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flushIfNoSpaceFor(alignment); |
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return AssemblerBuffer::isAligned(alignment); |
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127 |
} |
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128 |
|
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129 |
void putByteUnchecked(int value) |
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130 |
{ |
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131 |
AssemblerBuffer::putByteUnchecked(value); |
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132 |
correctDeltas(1); |
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133 |
} |
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|
134 |
|
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135 |
void putByte(int value) |
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136 |
{ |
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137 |
flushIfNoSpaceFor(1); |
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138 |
AssemblerBuffer::putByte(value); |
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139 |
correctDeltas(1); |
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140 |
} |
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|
141 |
|
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142 |
void putShortUnchecked(int value) |
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143 |
{ |
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144 |
AssemblerBuffer::putShortUnchecked(value); |
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145 |
correctDeltas(2); |
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146 |
} |
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147 |
|
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148 |
void putShort(int value) |
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149 |
{ |
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150 |
flushIfNoSpaceFor(2); |
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151 |
AssemblerBuffer::putShort(value); |
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152 |
correctDeltas(2); |
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153 |
} |
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154 |
|
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155 |
void putIntUnchecked(int value) |
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156 |
{ |
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157 |
AssemblerBuffer::putIntUnchecked(value); |
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158 |
correctDeltas(4); |
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159 |
} |
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|
160 |
|
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161 |
void putInt(int value) |
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162 |
{ |
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163 |
flushIfNoSpaceFor(4); |
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164 |
AssemblerBuffer::putInt(value); |
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165 |
correctDeltas(4); |
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|
166 |
} |
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|
167 |
|
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|
168 |
void putInt64Unchecked(int64_t value) |
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169 |
{ |
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170 |
AssemblerBuffer::putInt64Unchecked(value); |
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171 |
correctDeltas(8); |
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172 |
} |
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|
173 |
|
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174 |
int size() |
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175 |
{ |
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|
176 |
flushIfNoSpaceFor(maxInstructionSize, sizeof(uint64_t)); |
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177 |
return AssemblerBuffer::size(); |
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178 |
} |
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|
179 |
|
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int uncheckedSize() |
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181 |
{ |
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return AssemblerBuffer::size(); |
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183 |
} |
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|
184 |
|
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185 |
void* executableCopy(ExecutablePool* allocator) |
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186 |
{ |
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187 |
flushConstantPool(false); |
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return AssemblerBuffer::executableCopy(allocator); |
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189 |
} |
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|
190 |
|
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|
191 |
void putIntWithConstantInt(uint32_t insn, uint32_t constant, bool isReusable = false) |
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192 |
{ |
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|
193 |
if (!m_numConsts) |
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|
194 |
m_maxDistance = maxPoolSize; |
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|
195 |
flushIfNoSpaceFor(4, 4); |
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|
196 |
|
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|
197 |
m_loadOffsets.append(AssemblerBuffer::size()); |
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if (isReusable) |
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199 |
for (int i = 0; i < m_numConsts; ++i) { |
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|
200 |
if (m_mask[i] == ReusableConst && m_pool[i] == constant) { |
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|
201 |
AssemblerBuffer::putInt(AssemblerType::patchConstantPoolLoad(insn, i)); |
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|
202 |
correctDeltas(4); |
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203 |
return; |
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204 |
} |
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|
205 |
} |
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|
206 |
|
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|
207 |
m_pool[m_numConsts] = constant; |
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m_mask[m_numConsts] = static_cast<char>(isReusable ? ReusableConst : UniqueConst); |
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209 |
|
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AssemblerBuffer::putInt(AssemblerType::patchConstantPoolLoad(insn, m_numConsts)); |
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++m_numConsts; |
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212 |
|
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correctDeltas(4, 4); |
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} |
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215 |
|
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// This flushing mechanism can be called after any unconditional jumps. |
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void flushWithoutBarrier(bool isForced = false) |
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{ |
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// Flush if constant pool is more than 60% full to avoid overuse of this function. |
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if (isForced || 5 * m_numConsts > 3 * maxPoolSize / sizeof(uint32_t)) |
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flushConstantPool(false); |
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} |
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223 |
|
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uint32_t* poolAddress() |
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{ |
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return m_pool; |
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} |
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|
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int sizeOfConstantPool() |
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{ |
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return m_numConsts; |
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} |
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233 |
|
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private: |
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void correctDeltas(int insnSize) |
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{ |
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m_maxDistance -= insnSize; |
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m_lastConstDelta -= insnSize; |
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if (m_lastConstDelta < 0) |
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m_lastConstDelta = 0; |
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} |
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|
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void correctDeltas(int insnSize, int constSize) |
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{ |
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correctDeltas(insnSize); |
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|
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m_maxDistance -= m_lastConstDelta; |
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m_lastConstDelta = constSize; |
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} |
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|
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void flushConstantPool(bool useBarrier = true) |
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{ |
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if (m_numConsts == 0) |
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return; |
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int alignPool = (AssemblerBuffer::size() + (useBarrier ? barrierSize : 0)) & (sizeof(uint64_t) - 1); |
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|
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if (alignPool) |
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alignPool = sizeof(uint64_t) - alignPool; |
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|
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// Callback to protect the constant pool from execution |
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if (useBarrier) |
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AssemblerBuffer::putInt(AssemblerType::placeConstantPoolBarrier(m_numConsts * sizeof(uint32_t) + alignPool)); |
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263 |
|
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if (alignPool) { |
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if (alignPool & 1) |
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AssemblerBuffer::putByte(AssemblerType::padForAlign8); |
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if (alignPool & 2) |
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AssemblerBuffer::putShort(AssemblerType::padForAlign16); |
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if (alignPool & 4) |
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AssemblerBuffer::putInt(AssemblerType::padForAlign32); |
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} |
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272 |
|
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int constPoolOffset = AssemblerBuffer::size(); |
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append(reinterpret_cast<char*>(m_pool), m_numConsts * sizeof(uint32_t)); |
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|
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// Patch each PC relative load |
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for (LoadOffsets::Iterator iter = m_loadOffsets.begin(); iter != m_loadOffsets.end(); ++iter) { |
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void* loadAddr = reinterpret_cast<void*>(m_buffer + *iter); |
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AssemblerType::patchConstantPoolLoad(loadAddr, reinterpret_cast<void*>(m_buffer + constPoolOffset)); |
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} |
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|
281 |
|
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m_loadOffsets.clear(); |
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m_numConsts = 0; |
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} |
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|
285 |
|
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void flushIfNoSpaceFor(int nextInsnSize) |
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{ |
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if (m_numConsts == 0) |
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return; |
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int lastConstDelta = m_lastConstDelta > nextInsnSize ? m_lastConstDelta - nextInsnSize : 0; |
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if ((m_maxDistance < nextInsnSize + lastConstDelta + barrierSize + (int)sizeof(uint32_t))) |
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flushConstantPool(); |
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} |
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|
294 |
|
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void flushIfNoSpaceFor(int nextInsnSize, int nextConstSize) |
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296 |
{ |
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if (m_numConsts == 0) |
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return; |
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if ((m_maxDistance < nextInsnSize + m_lastConstDelta + nextConstSize + barrierSize + (int)sizeof(uint32_t)) || |
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(m_numConsts * sizeof(uint32_t) + nextConstSize >= maxPoolSize)) |
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flushConstantPool(); |
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} |
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|
303 |
|
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uint32_t* m_pool; |
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char* m_mask; |
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LoadOffsets m_loadOffsets; |
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|
307 |
|
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int m_numConsts; |
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int m_maxDistance; |
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int m_lastConstDelta; |
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}; |
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} // namespace JSC |
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#endif // ENABLE(ASSEMBLER) |
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#endif // AssemblerBufferWithConstantPool_h |