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1692
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1 /*
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2 * Copyright (c) 1999, 2007, 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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26 // Base classes used to track various values through the compilation.
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27 // SharkCompileInvariants is used to track values which remain the
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28 // same for the top-level method and any inlined methods it may have
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29 // (ie for the whole compilation). SharkTargetInvariants is used to
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30 // track values which differ between methods.
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31
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32 class SharkCompileInvariants : public ResourceObj {
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33 protected:
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34 SharkCompileInvariants(ciEnv* env, SharkBuilder* builder)
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35 : _env(env),
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36 _builder(builder),
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37 _thread(NULL) {}
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38
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39 SharkCompileInvariants(const SharkCompileInvariants* parent)
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40 : _env(parent->_env),
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41 _builder(parent->_builder),
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42 _thread(parent->_thread) {}
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43
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44 private:
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45 ciEnv* _env;
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46 SharkBuilder* _builder;
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47 llvm::Value* _thread;
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48
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49 // Top-level broker for HotSpot's Compiler Interface.
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50 //
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51 // Its main purpose is to allow the various CI classes to access
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52 // oops in the VM without having to worry about safepointing. In
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53 // addition to this it acts as a holder for various recorders and
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54 // memory allocators.
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55 //
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56 // Accessing this directly is kind of ugly, so it's private. Add
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57 // new accessors below if you need something from it.
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58 private:
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59 ciEnv* env() const {
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60 assert(_env != NULL, "env not available");
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61 return _env;
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62 }
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63
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64 // The SharkBuilder that is used to build LLVM IR.
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65 protected:
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66 SharkBuilder* builder() const {
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67 return _builder;
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68 }
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69
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70 // Pointer to this thread's JavaThread object. This is not
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71 // available until a short way into SharkFunction creation
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72 // so a setter is required. Assertions are used to enforce
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73 // invariance.
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74 protected:
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75 llvm::Value* thread() const {
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76 assert(_thread != NULL, "thread not available");
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77 return _thread;
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78 }
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79 void set_thread(llvm::Value* thread) {
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80 assert(_thread == NULL, "thread already set");
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81 _thread = thread;
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82 }
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83
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84 // Objects that handle various aspects of the compilation.
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85 protected:
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86 DebugInformationRecorder* debug_info() const {
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87 return env()->debug_info();
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88 }
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89 Dependencies* dependencies() const {
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90 return env()->dependencies();
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91 }
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92 SharkCodeBuffer* code_buffer() const {
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93 return builder()->code_buffer();
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94 }
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95
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96 // Commonly used classes
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97 protected:
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98 ciInstanceKlass* java_lang_Object_klass() const {
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99 return env()->Object_klass();
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100 }
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101 ciInstanceKlass* java_lang_Throwable_klass() const {
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102 return env()->Throwable_klass();
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103 }
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104 };
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105
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106 class SharkTargetInvariants : public SharkCompileInvariants {
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107 protected:
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108 SharkTargetInvariants(ciEnv* env, SharkBuilder* builder, ciTypeFlow* flow)
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109 : SharkCompileInvariants(env, builder),
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110 _target(flow->method()),
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111 _flow(flow),
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112 _max_monitors(count_monitors()) {}
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113
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114 SharkTargetInvariants(const SharkCompileInvariants* parent, ciMethod* target)
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115 : SharkCompileInvariants(parent),
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116 _target(target),
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117 _flow(NULL),
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118 _max_monitors(count_monitors()) {}
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119
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120 SharkTargetInvariants(const SharkTargetInvariants* parent)
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121 : SharkCompileInvariants(parent),
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122 _target(parent->_target),
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123 _flow(parent->_flow),
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124 _max_monitors(parent->_max_monitors) {}
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125
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126 private:
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127 int count_monitors();
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128
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129 private:
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130 ciMethod* _target;
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131 ciTypeFlow* _flow;
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132 int _max_monitors;
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133
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134 // The method being compiled.
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135 protected:
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136 ciMethod* target() const {
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137 return _target;
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138 }
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139
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140 // Typeflow analysis of the method being compiled.
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141 protected:
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142 ciTypeFlow* flow() const {
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143 assert(_flow != NULL, "typeflow not available");
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144 return _flow;
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145 }
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146
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147 // Properties of the method.
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148 protected:
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149 int max_locals() const {
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150 return target()->max_locals();
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151 }
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152 int max_stack() const {
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153 return target()->max_stack();
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154 }
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155 int max_monitors() const {
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156 return _max_monitors;
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157 }
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158 int arg_size() const {
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159 return target()->arg_size();
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160 }
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161 bool is_static() const {
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162 return target()->is_static();
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163 }
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164 bool is_synchronized() const {
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165 return target()->is_synchronized();
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166 }
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167 };
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