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1 /*
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2 * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class CompileTask;
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26
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27 // ciEnv
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28 //
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29 // This class is the top level broker for requests from the compiler
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30 // to the VM.
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31 class ciEnv : StackObj {
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32 CI_PACKAGE_ACCESS_TO
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33
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34 friend class CompileBroker;
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35 friend class Dependencies; // for get_object, during logging
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36
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37 private:
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38 Arena* _arena; // Alias for _ciEnv_arena except in init_shared_objects()
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39 Arena _ciEnv_arena;
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40 int _system_dictionary_modification_counter;
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41 ciObjectFactory* _factory;
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42 OopRecorder* _oop_recorder;
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43 DebugInformationRecorder* _debug_info;
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44 Dependencies* _dependencies;
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45 const char* _failure_reason;
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46 int _compilable;
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47 bool _break_at_compile;
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48 int _num_inlined_bytecodes;
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49 CompileTask* _task; // faster access to CompilerThread::task
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50 CompileLog* _log; // faster access to CompilerThread::log
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51 void* _compiler_data; // compiler-specific stuff, if any
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52
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53 char* _name_buffer;
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54 int _name_buffer_len;
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55
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56 // Distinguished instances of certain ciObjects..
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57 static ciObject* _null_object_instance;
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58 static ciMethodKlass* _method_klass_instance;
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59 static ciSymbolKlass* _symbol_klass_instance;
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60 static ciKlassKlass* _klass_klass_instance;
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61 static ciInstanceKlassKlass* _instance_klass_klass_instance;
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62 static ciTypeArrayKlassKlass* _type_array_klass_klass_instance;
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63 static ciObjArrayKlassKlass* _obj_array_klass_klass_instance;
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64
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65 static ciInstanceKlass* _ArrayStoreException;
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66 static ciInstanceKlass* _Class;
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67 static ciInstanceKlass* _ClassCastException;
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68 static ciInstanceKlass* _Object;
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69 static ciInstanceKlass* _Throwable;
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70 static ciInstanceKlass* _Thread;
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71 static ciInstanceKlass* _OutOfMemoryError;
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72 static ciInstanceKlass* _String;
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73
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74 static ciSymbol* _unloaded_cisymbol;
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75 static ciInstanceKlass* _unloaded_ciinstance_klass;
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76 static ciObjArrayKlass* _unloaded_ciobjarrayklass;
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77
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78 static jobject _ArrayIndexOutOfBoundsException_handle;
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79 static jobject _ArrayStoreException_handle;
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80 static jobject _ClassCastException_handle;
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81
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82 ciInstance* _NullPointerException_instance;
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83 ciInstance* _ArithmeticException_instance;
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84 ciInstance* _ArrayIndexOutOfBoundsException_instance;
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85 ciInstance* _ArrayStoreException_instance;
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86 ciInstance* _ClassCastException_instance;
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87
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88 // Look up a klass by name from a particular class loader (the accessor's).
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89 // If require_local, result must be defined in that class loader, or NULL.
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90 // If !require_local, a result from remote class loader may be reported,
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91 // if sufficient class loader constraints exist such that initiating
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92 // a class loading request from the given loader is bound to return
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93 // the class defined in the remote loader (or throw an error).
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94 //
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95 // Return an unloaded klass if !require_local and no class at all is found.
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96 //
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97 // The CI treats a klass as loaded if it is consistently defined in
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98 // another loader, even if it hasn't yet been loaded in all loaders
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99 // that could potentially see it via delegation.
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100 ciKlass* get_klass_by_name(ciKlass* accessing_klass,
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101 ciSymbol* klass_name,
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102 bool require_local);
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103
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104 // Constant pool access.
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105 ciKlass* get_klass_by_index(ciInstanceKlass* loading_klass,
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106 int klass_index,
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107 bool& is_accessible);
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108 ciConstant get_constant_by_index(ciInstanceKlass* loading_klass,
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109 int constant_index);
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110 bool is_unresolved_string(ciInstanceKlass* loading_klass,
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111 int constant_index) const;
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112 bool is_unresolved_klass(ciInstanceKlass* loading_klass,
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113 int constant_index) const;
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114 ciField* get_field_by_index(ciInstanceKlass* loading_klass,
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115 int field_index);
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116 ciMethod* get_method_by_index(ciInstanceKlass* loading_klass,
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117 int method_index, Bytecodes::Code bc);
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118
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119 // Implementation methods for loading and constant pool access.
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120 ciKlass* get_klass_by_name_impl(ciKlass* accessing_klass,
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121 ciSymbol* klass_name,
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122 bool require_local);
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123 ciKlass* get_klass_by_index_impl(ciInstanceKlass* loading_klass,
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124 int klass_index,
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125 bool& is_accessible);
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126 ciConstant get_constant_by_index_impl(ciInstanceKlass* loading_klass,
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127 int constant_index);
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128 bool is_unresolved_string_impl (instanceKlass* loading_klass,
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129 int constant_index) const;
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130 bool is_unresolved_klass_impl (instanceKlass* loading_klass,
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131 int constant_index) const;
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132 ciField* get_field_by_index_impl(ciInstanceKlass* loading_klass,
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133 int field_index);
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134 ciMethod* get_method_by_index_impl(ciInstanceKlass* loading_klass,
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135 int method_index, Bytecodes::Code bc);
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136
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137 // Helper methods
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138 bool check_klass_accessibility(ciKlass* accessing_klass,
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139 klassOop resolved_klassOop);
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140 methodOop lookup_method(instanceKlass* accessor,
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141 instanceKlass* holder,
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142 symbolOop name,
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143 symbolOop sig,
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144 Bytecodes::Code bc);
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145
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146 // Get a ciObject from the object factory. Ensures uniqueness
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147 // of ciObjects.
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148 ciObject* get_object(oop o) {
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149 if (o == NULL) {
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150 return _null_object_instance;
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151 } else {
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152 return _factory->get(o);
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153 }
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154 }
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155
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156 ciMethod* get_method_from_handle(jobject method);
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157
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158 ciInstance* get_or_create_exception(jobject& handle, symbolHandle name);
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159
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160 // Get a ciMethod representing either an unfound method or
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161 // a method with an unloaded holder. Ensures uniqueness of
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162 // the result.
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163 ciMethod* get_unloaded_method(ciInstanceKlass* holder,
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164 ciSymbol* name,
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165 ciSymbol* signature) {
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166 return _factory->get_unloaded_method(holder, name, signature);
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167 }
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168
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169 // Get a ciKlass representing an unloaded klass.
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170 // Ensures uniqueness of the result.
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171 ciKlass* get_unloaded_klass(ciKlass* accessing_klass,
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172 ciSymbol* name) {
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173 return _factory->get_unloaded_klass(accessing_klass, name, true);
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174 }
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175
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176 // See if we already have an unloaded klass for the given name
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177 // or return NULL if not.
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178 ciKlass *check_get_unloaded_klass(ciKlass* accessing_klass, ciSymbol* name) {
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179 return _factory->get_unloaded_klass(accessing_klass, name, false);
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180 }
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181
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182 // Get a ciReturnAddress corresponding to the given bci.
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183 // Ensures uniqueness of the result.
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184 ciReturnAddress* get_return_address(int bci) {
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185 return _factory->get_return_address(bci);
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186 }
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187
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188 // Get a ciMethodData representing the methodData for a method
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189 // with none.
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190 ciMethodData* get_empty_methodData() {
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191 return _factory->get_empty_methodData();
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192 }
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193
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194 // General utility : get a buffer of some required length.
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195 // Used in symbol creation.
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196 char* name_buffer(int req_len);
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197
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198 // Is this thread currently in the VM state?
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199 static bool is_in_vm();
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200
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201 // Helper routine for determining the validity of a compilation
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202 // with respect to concurrent class loading.
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203 void check_for_system_dictionary_modification(ciMethod* target);
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204
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205 public:
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206 enum {
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207 MethodCompilable,
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208 MethodCompilable_not_at_tier,
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209 MethodCompilable_never
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210 };
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211
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212 ciEnv(CompileTask* task, int system_dictionary_modification_counter);
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213 // Used only during initialization of the ci
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214 ciEnv(Arena* arena);
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215 ~ciEnv();
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216
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217 OopRecorder* oop_recorder() { return _oop_recorder; }
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218 void set_oop_recorder(OopRecorder* r) { _oop_recorder = r; }
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219
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220 DebugInformationRecorder* debug_info() { return _debug_info; }
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221 void set_debug_info(DebugInformationRecorder* i) { _debug_info = i; }
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222
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223 Dependencies* dependencies() { return _dependencies; }
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224 void set_dependencies(Dependencies* d) { _dependencies = d; }
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225
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226 // This is true if the compilation is not going to produce code.
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227 // (It is reasonable to retry failed compilations.)
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228 bool failing() { return _failure_reason != NULL; }
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229
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230 // Reason this compilation is failing, such as "too many basic blocks".
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231 const char* failure_reason() { return _failure_reason; }
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232
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233 // Return state of appropriate compilability
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234 int compilable() { return _compilable; }
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235
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236 bool break_at_compile() { return _break_at_compile; }
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237 void set_break_at_compile(bool z) { _break_at_compile = z; }
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238
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239 // The compiler task which has created this env.
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240 // May be useful to find out compile_id, comp_level, etc.
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241 CompileTask* task() { return _task; }
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242 // Handy forwards to the task:
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243 int comp_level(); // task()->comp_level()
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244 uint compile_id(); // task()->compile_id()
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245
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246 // Register the result of a compilation.
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247 void register_method(ciMethod* target,
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248 int entry_bci,
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249 CodeOffsets* offsets,
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250 int orig_pc_offset,
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251 CodeBuffer* code_buffer,
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252 int frame_words,
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253 OopMapSet* oop_map_set,
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254 ExceptionHandlerTable* handler_table,
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255 ImplicitExceptionTable* inc_table,
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256 AbstractCompiler* compiler,
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257 int comp_level,
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258 bool has_debug_info = true,
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259 bool has_unsafe_access = false);
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260
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261
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262 // Access to certain well known ciObjects.
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263 ciInstanceKlass* ArrayStoreException_klass() {
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264 return _ArrayStoreException;
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265 }
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266 ciInstanceKlass* Class_klass() {
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267 return _Class;
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268 }
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269 ciInstanceKlass* ClassCastException_klass() {
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270 return _ClassCastException;
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271 }
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272 ciInstanceKlass* Object_klass() {
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273 return _Object;
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274 }
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275 ciInstanceKlass* Throwable_klass() {
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276 return _Throwable;
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277 }
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278 ciInstanceKlass* Thread_klass() {
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279 return _Thread;
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280 }
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281 ciInstanceKlass* OutOfMemoryError_klass() {
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282 return _OutOfMemoryError;
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283 }
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284 ciInstanceKlass* String_klass() {
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285 return _String;
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286 }
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287 ciInstance* NullPointerException_instance() {
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288 assert(_NullPointerException_instance != NULL, "initialization problem");
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289 return _NullPointerException_instance;
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290 }
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291 ciInstance* ArithmeticException_instance() {
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292 assert(_ArithmeticException_instance != NULL, "initialization problem");
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293 return _ArithmeticException_instance;
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294 }
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295
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296 // Lazy constructors:
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297 ciInstance* ArrayIndexOutOfBoundsException_instance();
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298 ciInstance* ArrayStoreException_instance();
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299 ciInstance* ClassCastException_instance();
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300
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301 static ciSymbol* unloaded_cisymbol() {
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302 return _unloaded_cisymbol;
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303 }
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304 static ciObjArrayKlass* unloaded_ciobjarrayklass() {
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305 return _unloaded_ciobjarrayklass;
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306 }
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307 static ciInstanceKlass* unloaded_ciinstance_klass() {
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308 return _unloaded_ciinstance_klass;
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309 }
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310
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311 ciKlass* find_system_klass(ciSymbol* klass_name);
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312 // Note: To find a class from its name string, use ciSymbol::make,
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313 // but consider adding to vmSymbols.hpp instead.
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314
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315 // Use this to make a holder for non-perm compile time constants.
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316 // The resulting array is guaranteed to satisfy "has_encoding".
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317 ciArray* make_array(GrowableArray<ciObject*>* objects);
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318
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319 // converts the ciKlass* representing the holder of a method into a
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320 // ciInstanceKlass*. This is needed since the holder of a method in
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321 // the bytecodes could be an array type. Basically this converts
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322 // array types into java/lang/Object and other types stay as they are.
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323 static ciInstanceKlass* get_instance_klass_for_declared_method_holder(ciKlass* klass);
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324
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325 // Return the machine-level offset of o, which must be an element of a.
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326 // This may be used to form constant-loading expressions in lieu of simpler encodings.
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327 int array_element_offset_in_bytes(ciArray* a, ciObject* o);
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328
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329 // Access to the compile-lifetime allocation arena.
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330 Arena* arena() { return _arena; }
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331
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332 // What is the current compilation environment?
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333 static ciEnv* current() { return CompilerThread::current()->env(); }
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334
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335 // Overload with current thread argument
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336 static ciEnv* current(CompilerThread *thread) { return thread->env(); }
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337
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338 // Per-compiler data. (Used by C2 to publish the Compile* pointer.)
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339 void* compiler_data() { return _compiler_data; }
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340 void set_compiler_data(void* x) { _compiler_data = x; }
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341
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342 // Notice that a method has been inlined in the current compile;
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343 // used only for statistics.
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344 void notice_inlined_method(ciMethod* method);
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345
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346 // Total number of bytecodes in inlined methods in this compile
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347 int num_inlined_bytecodes() const;
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348
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349 // Output stream for logging compilation info.
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350 CompileLog* log() { return _log; }
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351 void set_log(CompileLog* log) { _log = log; }
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352
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353 // Check for changes to the system dictionary during compilation
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354 bool system_dictionary_modification_counter_changed();
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355
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356 void record_failure(const char* reason);
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357 void record_method_not_compilable(const char* reason, bool all_tiers = true);
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358 void record_out_of_memory_failure();
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359 };
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