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1 /*
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2 * Copyright 2003-2006 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 // An constMethodOop represents portions of a Java method which
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26 // do not vary.
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27 //
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28 // Memory layout (each line represents a word). Note that most
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29 // applications load thousands of methods, so keeping the size of this
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30 // structure small has a big impact on footprint.
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31 //
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32 // |------------------------------------------------------|
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33 // | header |
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34 // | klass |
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35 // |------------------------------------------------------|
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36 // | fingerprint 1 |
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37 // | fingerprint 2 |
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38 // | method (oop) |
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39 // | stackmap_data (oop) |
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40 // | exception_table (oop) |
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41 // | constMethod_size |
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42 // | interp_kind | flags | code_size |
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43 // | name index | signature index |
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44 // | method_idnum | generic_signature_index |
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45 // |------------------------------------------------------|
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46 // | |
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47 // | byte codes |
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48 // | |
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49 // |------------------------------------------------------|
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50 // | compressed linenumber table |
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51 // | (see class CompressedLineNumberReadStream) |
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52 // | (note that length is unknown until decompressed) |
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53 // | (access flags bit tells whether table is present) |
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54 // | (indexed from start of constMethodOop) |
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55 // | (elements not necessarily sorted!) |
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56 // |------------------------------------------------------|
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57 // | localvariable table elements + length (length last) |
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58 // | (length is u2, elements are 6-tuples of u2) |
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59 // | (see class LocalVariableTableElement) |
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60 // | (access flags bit tells whether table is present) |
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61 // | (indexed from end of contMethodOop) |
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62 // |------------------------------------------------------|
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63 // | checked exceptions elements + length (length last) |
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64 // | (length is u2, elements are u2) |
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65 // | (see class CheckedExceptionElement) |
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66 // | (access flags bit tells whether table is present) |
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67 // | (indexed from end of constMethodOop) |
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68 // |------------------------------------------------------|
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69
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70
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71 // Utitily class decribing elements in checked exceptions table inlined in methodOop.
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72 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC {
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73 public:
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74 u2 class_cp_index;
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75 };
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76
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77
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78 // Utitily class decribing elements in local variable table inlined in methodOop.
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79 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC {
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80 public:
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81 u2 start_bci;
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82 u2 length;
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83 u2 name_cp_index;
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84 u2 descriptor_cp_index;
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85 u2 signature_cp_index;
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86 u2 slot;
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87 };
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88
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89
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90 class constMethodOopDesc : public oopDesc {
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91 friend class constMethodKlass;
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92 friend class VMStructs;
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93 private:
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94 enum {
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95 _has_linenumber_table = 1,
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96 _has_checked_exceptions = 2,
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97 _has_localvariable_table = 4
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98 };
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99
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100 // Bit vector of signature
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101 // Callers interpret 0=not initialized yet and
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102 // -1=too many args to fix, must parse the slow way.
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103 // The real initial value is special to account for nonatomicity of 64 bit
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104 // loads and stores. This value may updated and read without a lock by
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105 // multiple threads, so is volatile.
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106 volatile uint64_t _fingerprint;
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107
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108 public:
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109 oop* oop_block_beg() const { return adr_method(); }
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110 oop* oop_block_end() const { return adr_exception_table() + 1; }
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111
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112 private:
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113 //
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114 // The oop block. See comment in klass.hpp before making changes.
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115 //
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116
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117 // Backpointer to non-const methodOop (needed for some JVMTI operations)
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118 methodOop _method;
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119
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120 // Raw stackmap data for the method
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121 typeArrayOop _stackmap_data;
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122
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123 // The exception handler table. 4-tuples of ints [start_pc, end_pc,
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124 // handler_pc, catch_type index] For methods with no exceptions the
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125 // table is pointing to Universe::the_empty_int_array
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126 typeArrayOop _exception_table;
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127
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128 //
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129 // End of the oop block.
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130 //
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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 methodOop.
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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 public:
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146 // Inlined tables
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147 void set_inlined_tables_length(int checked_exceptions_len,
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148 int compressed_line_number_size,
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149 int localvariable_table_len);
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150
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151 bool has_linenumber_table() const
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152 { return (_flags & _has_linenumber_table) != 0; }
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153
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154 bool has_checked_exceptions() const
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155 { return (_flags & _has_checked_exceptions) != 0; }
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156
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157 bool has_localvariable_table() const
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158 { return (_flags & _has_localvariable_table) != 0; }
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159
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160 void set_interpreter_kind(int kind) { _interpreter_kind = kind; }
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161 int interpreter_kind(void) const { return _interpreter_kind; }
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162
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163 // backpointer to non-const methodOop
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164 methodOop method() const { return _method; }
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165 void set_method(methodOop m) { oop_store_without_check((oop*)&_method, (oop) m); }
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166
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167
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168 // stackmap table data
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169 typeArrayOop stackmap_data() const { return _stackmap_data; }
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170 void set_stackmap_data(typeArrayOop sd) {
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171 oop_store_without_check((oop*)&_stackmap_data, (oop)sd);
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172 }
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173 bool has_stackmap_table() const { return _stackmap_data != NULL; }
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174
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175 // exception handler table
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176 typeArrayOop exception_table() const { return _exception_table; }
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177 void set_exception_table(typeArrayOop e) { oop_store_without_check((oop*) &_exception_table, (oop) e); }
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178 bool has_exception_handler() const { return exception_table() != NULL && exception_table()->length() > 0; }
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179
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180 void init_fingerprint() {
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181 const uint64_t initval = CONST64(0x8000000000000000);
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182 _fingerprint = initval;
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183 }
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184
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185 uint64_t fingerprint() const {
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186 // Since reads aren't atomic for 64 bits, if any of the high or low order
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187 // word is the initial value, return 0. See init_fingerprint for initval.
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188 uint high_fp = (uint)(_fingerprint >> 32);
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189 if ((int) _fingerprint == 0 || high_fp == 0x80000000) {
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190 return 0L;
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191 } else {
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192 return _fingerprint;
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193 }
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194 }
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195
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196 uint64_t set_fingerprint(uint64_t new_fingerprint) {
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197 #ifdef ASSERT
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198 // Assert only valid if complete/valid 64 bit _fingerprint value is read.
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199 uint64_t oldfp = fingerprint();
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200 #endif // ASSERT
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201 _fingerprint = new_fingerprint;
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202 assert(oldfp == 0L || new_fingerprint == oldfp,
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203 "fingerprint cannot change");
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204 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0,
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205 "fingerprint should call init to set initial value");
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206 return new_fingerprint;
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207 }
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208
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209 // name
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210 int name_index() const { return _name_index; }
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211 void set_name_index(int index) { _name_index = index; }
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212
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213 // signature
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214 int signature_index() const { return _signature_index; }
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215 void set_signature_index(int index) { _signature_index = index; }
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216
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217 // generics support
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218 int generic_signature_index() const { return _generic_signature_index; }
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219 void set_generic_signature_index(int index) { _generic_signature_index = index; }
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220
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221 // Sizing
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222 static int header_size() {
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223 return sizeof(constMethodOopDesc)/HeapWordSize;
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224 }
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225
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226 // Object size needed
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227 static int object_size(int code_size, int compressed_line_number_size,
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228 int local_variable_table_length,
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229 int checked_exceptions_length);
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230
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231 int object_size() const { return _constMethod_size; }
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232 void set_constMethod_size(int size) { _constMethod_size = size; }
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233 // Is object parsable by gc
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234 bool object_is_parsable() { return object_size() > 0; }
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235
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236 // code size
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237 int code_size() const { return _code_size; }
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238 void set_code_size(int size) {
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239 assert(max_method_code_size < (1 << 16),
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240 "u2 is too small to hold method code size in general");
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241 assert(0 <= size && size <= max_method_code_size, "invalid code size");
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242 _code_size = size;
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243 }
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244
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245 // linenumber table - note that length is unknown until decompression,
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246 // see class CompressedLineNumberReadStream.
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247 u_char* compressed_linenumber_table() const; // not preserved by gc
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248 u2* checked_exceptions_length_addr() const;
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249 u2* localvariable_table_length_addr() const;
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250
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251 // checked exceptions
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252 int checked_exceptions_length() const;
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253 CheckedExceptionElement* checked_exceptions_start() const;
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254
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255 // localvariable table
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256 int localvariable_table_length() const;
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257 LocalVariableTableElement* localvariable_table_start() const;
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258
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259 // byte codes
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260 address code_base() const { return (address) (this+1); }
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261 address code_end() const { return code_base() + code_size(); }
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262 bool contains(address bcp) const { return code_base() <= bcp
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263 && bcp < code_end(); }
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264 // Offset to bytecodes
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265 static ByteSize codes_offset()
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266 { return in_ByteSize(sizeof(constMethodOopDesc)); }
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267
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268 // interpreter support
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269 static ByteSize exception_table_offset()
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270 { return byte_offset_of(constMethodOopDesc, _exception_table); }
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271
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272 // Garbage collection support
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273 oop* adr_method() const { return (oop*)&_method; }
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274 oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; }
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275 oop* adr_exception_table() const { return (oop*)&_exception_table; }
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276
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277 // Unique id for the method
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278 static const u2 MAX_IDNUM;
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279 static const u2 UNSET_IDNUM;
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280 u2 method_idnum() const { return _method_idnum; }
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281 void set_method_idnum(u2 idnum) { _method_idnum = idnum; }
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282
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283 private:
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284 // Since the size of the compressed line number table is unknown, the
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285 // offsets of the other variable sized sections are computed backwards
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286 // from the end of the constMethodOop.
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287
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288 // First byte after constMethodOop
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289 address constMethod_end() const
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290 { return (address)((oop*)this + _constMethod_size); }
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291
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292 // Last short in constMethodOop
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293 u2* last_u2_element() const
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294 { return (u2*)constMethod_end() - 1; }
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295 };
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