annotate src/share/vm/oops/constMethod.hpp @ 7402:fd74228fd5ca

8004076: Move _max_locals and _size_of_parameters to ConstMethod for better sharing. Summary: Move _max_locals and _size_of_parameters to ConstMethod for better sharing. Reviewed-by: coleenp, minqi, jrose
author jiangli
date Tue, 11 Dec 2012 12:41:31 -0500
parents b2dbd323c668
children ade95d680b42
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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 | max_stack |
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49 // | max_locals | size_of_parameters |
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50 // |------------------------------------------------------|
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51 // | |
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52 // | byte codes |
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53 // | |
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54 // |------------------------------------------------------|
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55 // | compressed linenumber table |
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56 // | (see class CompressedLineNumberReadStream) |
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57 // | (note that length is unknown until decompressed) |
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58 // | (access flags bit tells whether table is present) |
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59 // | (indexed from start of ConstMethod*) |
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60 // | (elements not necessarily sorted!) |
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61 // |------------------------------------------------------|
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62 // | localvariable table elements + length (length last) |
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63 // | (length is u2, elements are 6-tuples of u2) |
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64 // | (see class LocalVariableTableElement) |
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65 // | (access flags bit tells whether table is present) |
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66 // | (indexed from end of ConstMethod*) |
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67 // |------------------------------------------------------|
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68 // | exception table + length (length last) |
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69 // | (length is u2, elements are 4-tuples of u2) |
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70 // | (see class ExceptionTableElement) |
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71 // | (access flags bit tells whether table is present) |
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72 // | (indexed from end of ConstMethod*) |
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73 // |------------------------------------------------------|
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74 // | checked exceptions elements + length (length last) |
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75 // | (length is u2, elements are u2) |
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76 // | (see class CheckedExceptionElement) |
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77 // | (access flags bit tells whether table is present) |
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78 // | (indexed from end of ConstMethod*) |
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79 // |------------------------------------------------------|
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80 // | generic signature index (u2) |
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81 // | (indexed from start of constMethodOop) |
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82 // |------------------------------------------------------|
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83
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84
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85 // Utitily class decribing elements in checked exceptions table inlined in Method*.
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86 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC {
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87 public:
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88 u2 class_cp_index;
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89 };
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90
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91
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92 // Utitily class decribing elements in local variable table inlined in Method*.
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93 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC {
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94 public:
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95 u2 start_bci;
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96 u2 length;
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97 u2 name_cp_index;
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98 u2 descriptor_cp_index;
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99 u2 signature_cp_index;
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100 u2 slot;
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101 };
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102
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103 // Utitily class describing elements in exception table
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104 class ExceptionTableElement VALUE_OBJ_CLASS_SPEC {
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105 public:
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106 u2 start_pc;
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107 u2 end_pc;
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108 u2 handler_pc;
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109 u2 catch_type_index;
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110 };
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111
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112
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113 class ConstMethod : public MetaspaceObj {
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114 friend class VMStructs;
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115
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116 public:
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117 typedef enum { NORMAL, OVERPASS } MethodType;
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118
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119 private:
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120 enum {
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121 _has_linenumber_table = 1,
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122 _has_checked_exceptions = 2,
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123 _has_localvariable_table = 4,
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124 _has_exception_table = 8,
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125 _has_generic_signature = 16,
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126 _is_overpass = 32
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127 };
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128
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129 // Bit vector of signature
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130 // Callers interpret 0=not initialized yet and
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131 // -1=too many args to fix, must parse the slow way.
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132 // The real initial value is special to account for nonatomicity of 64 bit
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133 // loads and stores. This value may updated and read without a lock by
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134 // multiple threads, so is volatile.
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135 volatile uint64_t _fingerprint;
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136
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137 ConstantPool* _constants; // Constant pool
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138
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139 // Raw stackmap data for the method
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140 Array<u1>* _stackmap_data;
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141
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142 int _constMethod_size;
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143 jbyte _interpreter_kind;
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144 jbyte _flags;
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145
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146 // Size of Java bytecodes allocated immediately after Method*.
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147 u2 _code_size;
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148 u2 _name_index; // Method name (index in constant pool)
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149 u2 _signature_index; // Method signature (index in constant pool)
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150 u2 _method_idnum; // unique identification number for the method within the class
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151 // initially corresponds to the index into the methods array.
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152 // but this may change with redefinition
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153 u2 _max_stack; // Maximum number of entries on the expression stack
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154 u2 _max_locals; // Number of local variables used by this method
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155 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words
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156
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157 // Constructor
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158 ConstMethod(int byte_code_size,
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159 int compressed_line_number_size,
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160 int localvariable_table_length,
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161 int exception_table_length,
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162 int checked_exceptions_length,
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163 u2 generic_signature_index,
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164 MethodType is_overpass,
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165 int size);
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166 public:
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167
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168 static ConstMethod* allocate(ClassLoaderData* loader_data,
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169 int byte_code_size,
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170 int compressed_line_number_size,
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171 int localvariable_table_length,
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172 int exception_table_length,
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173 int checked_exceptions_length,
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174 u2 generic_signature_index,
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175 MethodType mt,
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176 TRAPS);
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177
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178 bool is_constMethod() const { return true; }
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179
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180 // Inlined tables
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181 void set_inlined_tables_length(u2 generic_signature_index,
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182 int checked_exceptions_len,
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183 int compressed_line_number_size,
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184 int localvariable_table_len,
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185 int exception_table_len);
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186
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187 bool has_generic_signature() const
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188 { return (_flags & _has_generic_signature) != 0; }
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189
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190 bool has_linenumber_table() const
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191 { return (_flags & _has_linenumber_table) != 0; }
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192
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193 bool has_checked_exceptions() const
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194 { return (_flags & _has_checked_exceptions) != 0; }
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195
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196 bool has_localvariable_table() const
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197 { return (_flags & _has_localvariable_table) != 0; }
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198
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199 bool has_exception_handler() const
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200 { return (_flags & _has_exception_table) != 0; }
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201
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202 MethodType method_type() const {
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203 return ((_flags & _is_overpass) == 0) ? NORMAL : OVERPASS;
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204 }
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205
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206 void set_method_type(MethodType mt) {
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207 if (mt == NORMAL) {
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208 _flags &= ~(_is_overpass);
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209 } else {
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210 _flags |= _is_overpass;
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211 }
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212 }
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213
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214
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215 void set_interpreter_kind(int kind) { _interpreter_kind = kind; }
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216 int interpreter_kind(void) const { return _interpreter_kind; }
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217
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218 // constant pool
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219 ConstantPool* constants() const { return _constants; }
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220 void set_constants(ConstantPool* c) { _constants = c; }
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221
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222 Method* method() const;
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223
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224 // stackmap table data
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225 Array<u1>* stackmap_data() const { return _stackmap_data; }
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226 void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; }
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227 bool has_stackmap_table() const { return _stackmap_data != NULL; }
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228
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229 void init_fingerprint() {
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230 const uint64_t initval = CONST64(0x8000000000000000);
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231 _fingerprint = initval;
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232 }
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233
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234 uint64_t fingerprint() const {
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235 // Since reads aren't atomic for 64 bits, if any of the high or low order
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236 // word is the initial value, return 0. See init_fingerprint for initval.
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237 uint high_fp = (uint)(_fingerprint >> 32);
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238 if ((int) _fingerprint == 0 || high_fp == 0x80000000) {
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239 return 0L;
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240 } else {
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241 return _fingerprint;
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242 }
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243 }
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244
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245 uint64_t set_fingerprint(uint64_t new_fingerprint) {
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246 #ifdef ASSERT
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247 // Assert only valid if complete/valid 64 bit _fingerprint value is read.
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248 uint64_t oldfp = fingerprint();
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249 #endif // ASSERT
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250 _fingerprint = new_fingerprint;
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251 assert(oldfp == 0L || new_fingerprint == oldfp,
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252 "fingerprint cannot change");
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253 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0,
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254 "fingerprint should call init to set initial value");
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255 return new_fingerprint;
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256 }
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257
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258 // name
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259 int name_index() const { return _name_index; }
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260 void set_name_index(int index) { _name_index = index; }
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261
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262 // signature
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263 int signature_index() const { return _signature_index; }
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264 void set_signature_index(int index) { _signature_index = index; }
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265
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266 // generics support
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267 int generic_signature_index() const {
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268 if (has_generic_signature()) {
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269 return *generic_signature_index_addr();
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270 } else {
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271 return 0;
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272 }
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273 }
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274 void set_generic_signature_index(u2 index) {
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275 assert(has_generic_signature(), "");
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276 u2* addr = generic_signature_index_addr();
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277 *addr = index;
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278 }
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279
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280 // Sizing
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281 static int header_size() {
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282 return sizeof(ConstMethod)/HeapWordSize;
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283 }
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284
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285 // Size needed
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286 static int size(int code_size, int compressed_line_number_size,
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287 int local_variable_table_length,
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288 int exception_table_length,
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289 int checked_exceptions_length,
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290 u2 generic_signature_index);
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291
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292 int size() const { return _constMethod_size;}
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293 void set_constMethod_size(int size) { _constMethod_size = size; }
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294
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295 // code size
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296 int code_size() const { return _code_size; }
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297 void set_code_size(int size) {
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298 assert(max_method_code_size < (1 << 16),
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299 "u2 is too small to hold method code size in general");
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300 assert(0 <= size && size <= max_method_code_size, "invalid code size");
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301 _code_size = size;
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302 }
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303
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304 // linenumber table - note that length is unknown until decompression,
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305 // see class CompressedLineNumberReadStream.
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306 u_char* compressed_linenumber_table() const; // not preserved by gc
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307 u2* generic_signature_index_addr() const;
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308 u2* checked_exceptions_length_addr() const;
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309 u2* localvariable_table_length_addr() const;
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310 u2* exception_table_length_addr() const;
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311
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312 // checked exceptions
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313 int checked_exceptions_length() const;
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314 CheckedExceptionElement* checked_exceptions_start() const;
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315
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316 // localvariable table
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317 int localvariable_table_length() const;
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318 LocalVariableTableElement* localvariable_table_start() const;
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319
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320 // exception table
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321 int exception_table_length() const;
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322 ExceptionTableElement* exception_table_start() const;
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323
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324 // byte codes
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325 void set_code(address code) {
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326 if (code_size() > 0) {
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327 memcpy(code_base(), code, code_size());
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328 }
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329 }
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330 address code_base() const { return (address) (this+1); }
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331 address code_end() const { return code_base() + code_size(); }
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332 bool contains(address bcp) const { return code_base() <= bcp
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333 && bcp < code_end(); }
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334 // Offset to bytecodes
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335 static ByteSize codes_offset()
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336 { return in_ByteSize(sizeof(ConstMethod)); }
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337
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338 static ByteSize constants_offset()
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339 { return byte_offset_of(ConstMethod, _constants); }
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340
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341 static ByteSize max_stack_offset()
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342 { return byte_offset_of(ConstMethod, _max_stack); }
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343 static ByteSize size_of_locals_offset()
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344 { return byte_offset_of(ConstMethod, _max_locals); }
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345 static ByteSize size_of_parameters_offset()
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346 { return byte_offset_of(ConstMethod, _size_of_parameters); }
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347
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348
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349 // Unique id for the method
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350 static const u2 MAX_IDNUM;
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351 static const u2 UNSET_IDNUM;
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352 u2 method_idnum() const { return _method_idnum; }
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353 void set_method_idnum(u2 idnum) { _method_idnum = idnum; }
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354
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355 // max stack
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356 int max_stack() const { return _max_stack; }
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357 void set_max_stack(int size) { _max_stack = size; }
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358
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359 // max locals
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360 int max_locals() const { return _max_locals; }
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361 void set_max_locals(int size) { _max_locals = size; }
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362
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363 // size of parameters
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364 int size_of_parameters() const { return _size_of_parameters; }
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365 void set_size_of_parameters(int size) { _size_of_parameters = size; }
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366
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367 // Deallocation for RedefineClasses
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368 void deallocate_contents(ClassLoaderData* loader_data);
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369 bool is_klass() const { return false; }
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370 DEBUG_ONLY(bool on_stack() { return false; })
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371
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372 private:
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373 // Since the size of the compressed line number table is unknown, the
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374 // offsets of the other variable sized sections are computed backwards
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375 // from the end of the ConstMethod*.
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376
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377 // First byte after ConstMethod*
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378 address constMethod_end() const
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379 { return (address)((oop*)this + _constMethod_size); }
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380
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381 // Last short in ConstMethod*
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382 u2* last_u2_element() const
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383 { return (u2*)constMethod_end() - 1; }
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384
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385 public:
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386 // Printing
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387 void print_on (outputStream* st) const;
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388 void print_value_on(outputStream* st) const;
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389
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390 const char* internal_name() const { return "{constMethod}"; }
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391
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392 // Verify
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393 void verify_on(outputStream* st);
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394 };
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395
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396 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP