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1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #ifndef SHARE_VM_OOPS_CONSTMETHODOOP_HPP |
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26 #define SHARE_VM_OOPS_CONSTMETHODOOP_HPP |
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27 |
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28 #include "oops/oop.hpp" |
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29 |
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30 // An ConstMethod* represents portions of a Java method which |
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31 // do not vary. |
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32 // |
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33 // Memory layout (each line represents a word). Note that most |
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34 // applications load thousands of methods, so keeping the size of this |
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35 // structure small has a big impact on footprint. |
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36 // |
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37 // |------------------------------------------------------| |
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38 // | header | |
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39 // | klass | |
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40 // |------------------------------------------------------| |
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41 // | fingerprint 1 | |
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42 // | fingerprint 2 | |
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43 // | constants (oop) | |
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44 // | stackmap_data (oop) | |
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45 // | constMethod_size | |
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46 // | interp_kind | flags | code_size | |
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47 // | name index | signature index | |
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48 // | method_idnum | generic_signature_index | |
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49 // |------------------------------------------------------| |
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50 // | | |
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51 // | byte codes | |
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52 // | | |
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53 // |------------------------------------------------------| |
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54 // | compressed linenumber table | |
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55 // | (see class CompressedLineNumberReadStream) | |
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56 // | (note that length is unknown until decompressed) | |
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57 // | (access flags bit tells whether table is present) | |
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58 // | (indexed from start of ConstMethod*) | |
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59 // | (elements not necessarily sorted!) | |
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60 // |------------------------------------------------------| |
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61 // | localvariable table elements + length (length last) | |
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62 // | (length is u2, elements are 6-tuples of u2) | |
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63 // | (see class LocalVariableTableElement) | |
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64 // | (access flags bit tells whether table is present) | |
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65 // | (indexed from end of ConstMethod*) | |
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66 // |------------------------------------------------------| |
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67 // | exception table + length (length last) | |
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68 // | (length is u2, elements are 4-tuples of u2) | |
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69 // | (see class ExceptionTableElement) | |
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70 // | (access flags bit tells whether table is present) | |
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71 // | (indexed from end of ConstMethod*) | |
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72 // |------------------------------------------------------| |
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73 // | checked exceptions elements + length (length last) | |
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74 // | (length is u2, elements are u2) | |
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75 // | (see class CheckedExceptionElement) | |
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76 // | (access flags bit tells whether table is present) | |
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77 // | (indexed from end of ConstMethod*) | |
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78 // |------------------------------------------------------| |
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79 |
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80 |
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81 // Utitily class decribing elements in checked exceptions table inlined in Method*. |
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82 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { |
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83 public: |
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84 u2 class_cp_index; |
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85 }; |
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86 |
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87 |
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88 // Utitily class decribing elements in local variable table inlined in Method*. |
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89 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC { |
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90 public: |
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91 u2 start_bci; |
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92 u2 length; |
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93 u2 name_cp_index; |
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94 u2 descriptor_cp_index; |
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95 u2 signature_cp_index; |
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96 u2 slot; |
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97 }; |
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98 |
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99 // Utitily class describing elements in exception table |
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100 class ExceptionTableElement VALUE_OBJ_CLASS_SPEC { |
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101 public: |
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102 u2 start_pc; |
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103 u2 end_pc; |
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104 u2 handler_pc; |
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105 u2 catch_type_index; |
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106 }; |
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107 |
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108 |
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109 class ConstMethod : public MetaspaceObj { |
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110 friend class VMStructs; |
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111 private: |
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112 enum { |
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113 _has_linenumber_table = 1, |
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114 _has_checked_exceptions = 2, |
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115 _has_localvariable_table = 4, |
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116 _has_exception_table = 8 |
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117 }; |
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118 |
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119 // Bit vector of signature |
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120 // Callers interpret 0=not initialized yet and |
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121 // -1=too many args to fix, must parse the slow way. |
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122 // The real initial value is special to account for nonatomicity of 64 bit |
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123 // loads and stores. This value may updated and read without a lock by |
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124 // multiple threads, so is volatile. |
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125 volatile uint64_t _fingerprint; |
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126 |
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127 ConstantPool* _constants; // Constant pool |
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128 |
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129 // Raw stackmap data for the method |
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130 Array<u1>* _stackmap_data; |
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131 |
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132 int _constMethod_size; |
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133 jbyte _interpreter_kind; |
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134 jbyte _flags; |
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135 |
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136 // Size of Java bytecodes allocated immediately after Method*. |
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137 u2 _code_size; |
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138 u2 _name_index; // Method name (index in constant pool) |
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139 u2 _signature_index; // Method signature (index in constant pool) |
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140 u2 _method_idnum; // unique identification number for the method within the class |
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141 // initially corresponds to the index into the methods array. |
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142 // but this may change with redefinition |
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143 u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent) |
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144 |
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145 |
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146 // Constructor |
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147 ConstMethod(int byte_code_size, |
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148 int compressed_line_number_size, |
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149 int localvariable_table_length, |
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150 int exception_table_length, |
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151 int checked_exceptions_length, |
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152 int size); |
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153 public: |
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154 static ConstMethod* allocate(ClassLoaderData* loader_data, |
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155 int byte_code_size, |
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156 int compressed_line_number_size, |
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157 int localvariable_table_length, |
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158 int exception_table_length, |
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159 int checked_exceptions_length, |
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160 TRAPS); |
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161 |
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162 bool is_constMethod() const { return true; } |
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163 |
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164 // Inlined tables |
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165 void set_inlined_tables_length(int checked_exceptions_len, |
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166 int compressed_line_number_size, |
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167 int localvariable_table_len, |
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168 int exception_table_len); |
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169 |
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170 bool has_linenumber_table() const |
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171 { return (_flags & _has_linenumber_table) != 0; } |
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172 |
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173 bool has_checked_exceptions() const |
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174 { return (_flags & _has_checked_exceptions) != 0; } |
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175 |
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176 bool has_localvariable_table() const |
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177 { return (_flags & _has_localvariable_table) != 0; } |
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178 |
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179 bool has_exception_handler() const |
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180 { return (_flags & _has_exception_table) != 0; } |
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181 |
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182 void set_interpreter_kind(int kind) { _interpreter_kind = kind; } |
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183 int interpreter_kind(void) const { return _interpreter_kind; } |
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184 |
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185 // constant pool |
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186 ConstantPool* constants() const { return _constants; } |
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187 void set_constants(ConstantPool* c) { _constants = c; } |
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188 |
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189 Method* method() const; |
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190 |
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191 // stackmap table data |
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192 Array<u1>* stackmap_data() const { return _stackmap_data; } |
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193 void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; } |
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194 bool has_stackmap_table() const { return _stackmap_data != NULL; } |
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195 |
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196 void init_fingerprint() { |
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197 const uint64_t initval = CONST64(0x8000000000000000); |
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198 _fingerprint = initval; |
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199 } |
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200 |
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201 uint64_t fingerprint() const { |
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202 // Since reads aren't atomic for 64 bits, if any of the high or low order |
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203 // word is the initial value, return 0. See init_fingerprint for initval. |
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204 uint high_fp = (uint)(_fingerprint >> 32); |
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205 if ((int) _fingerprint == 0 || high_fp == 0x80000000) { |
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206 return 0L; |
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207 } else { |
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208 return _fingerprint; |
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209 } |
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210 } |
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211 |
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212 uint64_t set_fingerprint(uint64_t new_fingerprint) { |
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213 #ifdef ASSERT |
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214 // Assert only valid if complete/valid 64 bit _fingerprint value is read. |
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215 uint64_t oldfp = fingerprint(); |
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216 #endif // ASSERT |
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217 _fingerprint = new_fingerprint; |
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218 assert(oldfp == 0L || new_fingerprint == oldfp, |
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219 "fingerprint cannot change"); |
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220 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, |
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221 "fingerprint should call init to set initial value"); |
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222 return new_fingerprint; |
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223 } |
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224 |
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225 // name |
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226 int name_index() const { return _name_index; } |
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227 void set_name_index(int index) { _name_index = index; } |
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228 |
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229 // signature |
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230 int signature_index() const { return _signature_index; } |
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231 void set_signature_index(int index) { _signature_index = index; } |
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232 |
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233 // generics support |
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234 int generic_signature_index() const { return _generic_signature_index; } |
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235 void set_generic_signature_index(int index) { _generic_signature_index = index; } |
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236 |
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237 // Sizing |
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238 static int header_size() { |
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239 return sizeof(ConstMethod)/HeapWordSize; |
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240 } |
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241 |
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242 // Size needed |
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243 static int size(int code_size, int compressed_line_number_size, |
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244 int local_variable_table_length, |
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245 int exception_table_length, |
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246 int checked_exceptions_length); |
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247 |
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248 int size() const { return _constMethod_size;} |
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249 void set_constMethod_size(int size) { _constMethod_size = size; } |
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250 |
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251 // code size |
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252 int code_size() const { return _code_size; } |
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253 void set_code_size(int size) { |
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254 assert(max_method_code_size < (1 << 16), |
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255 "u2 is too small to hold method code size in general"); |
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256 assert(0 <= size && size <= max_method_code_size, "invalid code size"); |
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257 _code_size = size; |
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258 } |
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259 |
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260 // linenumber table - note that length is unknown until decompression, |
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261 // see class CompressedLineNumberReadStream. |
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262 u_char* compressed_linenumber_table() const; // not preserved by gc |
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263 u2* checked_exceptions_length_addr() const; |
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264 u2* localvariable_table_length_addr() const; |
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265 u2* exception_table_length_addr() const; |
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266 |
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267 // checked exceptions |
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268 int checked_exceptions_length() const; |
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269 CheckedExceptionElement* checked_exceptions_start() const; |
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270 |
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271 // localvariable table |
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272 int localvariable_table_length() const; |
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273 LocalVariableTableElement* localvariable_table_start() const; |
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274 |
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275 // exception table |
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276 int exception_table_length() const; |
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277 ExceptionTableElement* exception_table_start() const; |
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278 |
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279 // byte codes |
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280 void set_code(address code) { |
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281 if (code_size() > 0) { |
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282 memcpy(code_base(), code, code_size()); |
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283 } |
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284 } |
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285 address code_base() const { return (address) (this+1); } |
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286 address code_end() const { return code_base() + code_size(); } |
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287 bool contains(address bcp) const { return code_base() <= bcp |
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288 && bcp < code_end(); } |
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289 // Offset to bytecodes |
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290 static ByteSize codes_offset() |
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291 { return in_ByteSize(sizeof(ConstMethod)); } |
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292 |
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293 static ByteSize constants_offset() |
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294 { return byte_offset_of(ConstMethod, _constants); } |
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295 |
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296 // Unique id for the method |
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297 static const u2 MAX_IDNUM; |
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298 static const u2 UNSET_IDNUM; |
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299 u2 method_idnum() const { return _method_idnum; } |
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300 void set_method_idnum(u2 idnum) { _method_idnum = idnum; } |
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301 |
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302 // Deallocation for RedefineClasses |
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303 void deallocate_contents(ClassLoaderData* loader_data); |
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304 bool is_klass() const { return false; } |
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305 DEBUG_ONLY(bool on_stack() { return false; }) |
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306 |
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307 private: |
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308 // Since the size of the compressed line number table is unknown, the |
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309 // offsets of the other variable sized sections are computed backwards |
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310 // from the end of the ConstMethod*. |
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311 |
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312 // First byte after ConstMethod* |
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313 address constMethod_end() const |
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314 { return (address)((oop*)this + _constMethod_size); } |
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315 |
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316 // Last short in ConstMethod* |
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317 u2* last_u2_element() const |
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318 { return (u2*)constMethod_end() - 1; } |
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319 |
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320 public: |
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321 // Printing |
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322 void print_on (outputStream* st) const; |
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323 void print_value_on(outputStream* st) const; |
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324 |
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325 const char* internal_name() const { return "{constMethod}"; } |
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326 |
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327 // Verify |
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328 void verify_on(outputStream* st); |
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329 }; |
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330 |
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331 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |