1692
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1 /*
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1972
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2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2008, 2009 Red Hat, Inc.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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1972
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26 #include "precompiled.hpp"
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27 #include "ci/ciTypeFlow.hpp"
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28 #include "memory/allocation.hpp"
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29 #include "shark/llvmHeaders.hpp"
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30 #include "shark/llvmValue.hpp"
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31 #include "shark/sharkBuilder.hpp"
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32 #include "shark/sharkEntry.hpp"
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33 #include "shark/sharkFunction.hpp"
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34 #include "shark/sharkState.hpp"
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35 #include "shark/sharkTopLevelBlock.hpp"
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36 #include "shark/shark_globals.hpp"
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37 #include "utilities/debug.hpp"
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38
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39 using namespace llvm;
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40
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41 void SharkFunction::initialize(const char *name) {
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42 // Create the function
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43 _function = Function::Create(
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44 entry_point_type(),
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45 GlobalVariable::InternalLinkage,
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46 name);
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47
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48 // Get our arguments
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49 Function::arg_iterator ai = function()->arg_begin();
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50 Argument *method = ai++;
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51 method->setName("method");
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52 Argument *osr_buf = NULL;
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53 if (is_osr()) {
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54 osr_buf = ai++;
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55 osr_buf->setName("osr_buf");
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56 }
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57 Argument *base_pc = ai++;
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58 base_pc->setName("base_pc");
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59 code_buffer()->set_base_pc(base_pc);
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60 Argument *thread = ai++;
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61 thread->setName("thread");
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62 set_thread(thread);
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63
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64 // Create the list of blocks
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65 set_block_insertion_point(NULL);
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66 _blocks = NEW_RESOURCE_ARRAY(SharkTopLevelBlock*, block_count());
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67 for (int i = 0; i < block_count(); i++) {
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68 ciTypeFlow::Block *b = flow()->pre_order_at(i);
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69
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70 // Work around a bug in pre_order_at() that does not return
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71 // the correct pre-ordering. If pre_order_at() were correct
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72 // this line could simply be:
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73 // _blocks[i] = new SharkTopLevelBlock(this, b);
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74 _blocks[b->pre_order()] = new SharkTopLevelBlock(this, b);
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75 }
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76
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77 // Walk the tree from the start block to determine which
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78 // blocks are entered and which blocks require phis
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79 SharkTopLevelBlock *start_block = block(flow()->start_block_num());
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80 assert(start_block->start() == flow()->start_bci(), "blocks out of order");
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81 start_block->enter();
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82
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83 // Initialize all entered blocks
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84 for (int i = 0; i < block_count(); i++) {
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85 if (block(i)->entered())
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86 block(i)->initialize();
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87 }
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88
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89 // Create and push our stack frame
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90 set_block_insertion_point(&function()->front());
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91 builder()->SetInsertPoint(CreateBlock());
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92 _stack = SharkStack::CreateBuildAndPushFrame(this, method);
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93
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94 // Create the entry state
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95 SharkState *entry_state;
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96 if (is_osr()) {
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97 entry_state = new SharkOSREntryState(start_block, method, osr_buf);
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98
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99 // Free the OSR buffer
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100 builder()->CreateCall(builder()->osr_migration_end(), osr_buf);
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101 }
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102 else {
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103 entry_state = new SharkNormalEntryState(start_block, method);
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104
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105 // Lock if necessary
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106 if (is_synchronized()) {
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107 SharkTopLevelBlock *locker =
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108 new SharkTopLevelBlock(this, start_block->ciblock());
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109 locker->add_incoming(entry_state);
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110
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111 set_block_insertion_point(start_block->entry_block());
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112 locker->acquire_method_lock();
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113
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114 entry_state = locker->current_state();
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115 }
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116 }
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117
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118 // Transition into the method proper
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119 start_block->add_incoming(entry_state);
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120 builder()->CreateBr(start_block->entry_block());
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121
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122 // Parse the blocks
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123 for (int i = 0; i < block_count(); i++) {
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124 if (!block(i)->entered())
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125 continue;
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126
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127 if (i + 1 < block_count())
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128 set_block_insertion_point(block(i + 1)->entry_block());
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129 else
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130 set_block_insertion_point(NULL);
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131
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132 block(i)->emit_IR();
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133 }
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134 do_deferred_zero_checks();
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135 }
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136
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137 class DeferredZeroCheck : public SharkTargetInvariants {
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138 public:
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139 DeferredZeroCheck(SharkTopLevelBlock* block, SharkValue* value)
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140 : SharkTargetInvariants(block),
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141 _block(block),
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142 _value(value),
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143 _bci(block->bci()),
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144 _state(block->current_state()->copy()),
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145 _check_block(builder()->GetInsertBlock()),
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146 _continue_block(function()->CreateBlock("not_zero")) {
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147 builder()->SetInsertPoint(continue_block());
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148 }
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149
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150 private:
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151 SharkTopLevelBlock* _block;
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152 SharkValue* _value;
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153 int _bci;
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154 SharkState* _state;
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155 BasicBlock* _check_block;
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156 BasicBlock* _continue_block;
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157
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158 public:
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159 SharkTopLevelBlock* block() const {
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160 return _block;
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161 }
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162 SharkValue* value() const {
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163 return _value;
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164 }
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165 int bci() const {
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166 return _bci;
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167 }
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168 SharkState* state() const {
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169 return _state;
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170 }
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171 BasicBlock* check_block() const {
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172 return _check_block;
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173 }
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174 BasicBlock* continue_block() const {
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175 return _continue_block;
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176 }
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177
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178 public:
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179 SharkFunction* function() const {
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180 return block()->function();
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181 }
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182
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183 public:
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184 void process() const {
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185 builder()->SetInsertPoint(check_block());
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186 block()->do_deferred_zero_check(value(), bci(), state(), continue_block());
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187 }
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188 };
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189
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190 void SharkFunction::add_deferred_zero_check(SharkTopLevelBlock* block,
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191 SharkValue* value) {
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192 deferred_zero_checks()->append(new DeferredZeroCheck(block, value));
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193 }
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194
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195 void SharkFunction::do_deferred_zero_checks() {
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196 for (int i = 0; i < deferred_zero_checks()->length(); i++)
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197 deferred_zero_checks()->at(i)->process();
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198 }
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