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annotate src/share/vm/interpreter/rewriter.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 1d7922586cf6
children f6b0eb4e44cf
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1 /*
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2 * Copyright (c) 1998, 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_INTERPRETER_REWRITER_HPP
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26 #define SHARE_VM_INTERPRETER_REWRITER_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "runtime/handles.inline.hpp"
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30 #include "utilities/growableArray.hpp"
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31
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32 // The Rewriter adds caches to the constant pool and rewrites bytecode indices
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33 // pointing into the constant pool for better interpreter performance.
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34
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35 class Rewriter: public StackObj {
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36 private:
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37 instanceKlassHandle _klass;
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38 constantPoolHandle _pool;
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39 Array<Method*>* _methods;
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40 intArray _cp_map;
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41 intStack _cp_cache_map; // for Methodref, Fieldref,
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42 // InterfaceMethodref and InvokeDynamic
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43 intArray _reference_map; // maps from cp index to resolved_refs index (or -1)
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44 intStack _resolved_references_map; // for strings, methodHandle, methodType
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45 intStack _invokedynamic_references_map; // for invokedynamic resolved refs
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46 intArray _method_handle_invokers;
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47 int _resolved_reference_limit;
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48
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49 void init_maps(int length) {
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50 _cp_map.initialize(length, -1);
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51 // Choose an initial value large enough that we don't get frequent
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52 // calls to grow().
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53 _cp_cache_map.initialize(length / 2);
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54 // Also cache resolved objects, in another different cache.
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55 _reference_map.initialize(length, -1);
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56 _resolved_references_map.initialize(length / 2);
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57 _invokedynamic_references_map.initialize(length / 2);
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58 _resolved_reference_limit = -1;
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59 DEBUG_ONLY(_cp_cache_index_limit = -1);
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60 }
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61
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62 int _cp_cache_index_limit;
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63 void record_map_limits() {
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64 #ifdef ASSERT
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65 // Record initial size of the two arrays generated for the CP cache:
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66 _cp_cache_index_limit = _cp_cache_map.length();
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67 #endif //ASSERT
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68 _resolved_reference_limit = _resolved_references_map.length();
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69 }
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70
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71 int cp_entry_to_cp_cache(int i) { assert(has_cp_cache(i), "oob"); return _cp_map[i]; }
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72 bool has_cp_cache(int i) { return (uint)i < (uint)_cp_map.length() && _cp_map[i] >= 0; }
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73
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74 int add_cp_cache_entry(int cp_index) {
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75 assert(_pool->tag_at(cp_index).value() != JVM_CONSTANT_InvokeDynamic, "use indy version");
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76 assert(_cp_map[cp_index] == -1, "not twice on same cp_index");
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77 assert(_cp_cache_index_limit == -1, "do not add cache entries after first iteration");
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78 int cache_index = _cp_cache_map.append(cp_index);
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79 _cp_map.at_put(cp_index, cache_index);
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80 assert(cp_entry_to_cp_cache(cp_index) == cache_index, "");
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81 assert(cp_cache_entry_pool_index(cache_index) == cp_index, "");
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82 return cache_index;
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83 }
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84
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85 // add a new CP cache entry beyond the normal cache (for invokedynamic only)
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86 int add_invokedynamic_cp_cache_entry(int cp_index) {
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87 assert(_pool->tag_at(cp_index).value() == JVM_CONSTANT_InvokeDynamic, "use non-indy version");
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88 assert(_cp_map[cp_index] == -1, "do not map from cp_index");
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89 assert(_cp_cache_index_limit >= 0, "add indy cache entries after first iteration");
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90 int cache_index = _cp_cache_map.append(cp_index);
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91 assert(cache_index >= _cp_cache_index_limit, "");
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92 // do not update _cp_map, since the mapping is one-to-many
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93 assert(cp_cache_entry_pool_index(cache_index) == cp_index, "");
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94 return cache_index;
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95 }
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96
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97 // fix duplicated code later
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98 int cp_entry_to_resolved_references(int cp_index) const {
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99 assert(has_entry_in_resolved_references(cp_index), "oob");
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100 return _reference_map[cp_index];
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101 }
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102 bool has_entry_in_resolved_references(int cp_index) const {
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103 return (uint)cp_index < (uint)_reference_map.length() && _reference_map[cp_index] >= 0;
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104 }
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105
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106 // add a new entry to the resolved_references map
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107 int add_resolved_references_entry(int cp_index) {
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108 assert(_reference_map[cp_index] == -1, "not twice on same cp_index");
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109 assert(_resolved_reference_limit == -1, "do not add CP refs after first iteration");
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110 int ref_index = _resolved_references_map.append(cp_index);
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111 _reference_map.at_put(cp_index, ref_index);
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112 assert(cp_entry_to_resolved_references(cp_index) == ref_index, "");
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113 return ref_index;
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114 }
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115
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116 // add a new entry to the resolved_references map (for invokedynamic only)
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117 int add_invokedynamic_resolved_references_entry(int cp_index, int cache_index) {
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118 assert(_resolved_reference_limit >= 0, "must add indy refs after first iteration");
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119 int ref_index = _resolved_references_map.append(cp_index); // many-to-one
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120 assert(ref_index >= _resolved_reference_limit, "");
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121 _invokedynamic_references_map.at_put_grow(ref_index, cache_index, -1);
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122 return ref_index;
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123 }
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124
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125 int resolved_references_entry_to_pool_index(int ref_index) {
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126 int cp_index = _resolved_references_map[ref_index];
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127 return cp_index;
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128 }
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129
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130 // invokedynamic support - append the cpCache entry (encoded) in object map.
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131 // The resolved_references_map should still be in ascending order
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132 // The resolved_references has the invokedynamic call site objects appended after
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133 // the objects that are resolved in the constant pool.
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134 int add_callsite_entry(int main_cpc_entry) {
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135 int ref_index = _resolved_references_map.append(main_cpc_entry);
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136 return ref_index;
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137 }
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138
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139 // Access the contents of _cp_cache_map to determine CP cache layout.
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140 int cp_cache_entry_pool_index(int cache_index) {
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141 int cp_index = _cp_cache_map[cache_index];
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142 return cp_index;
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143 }
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144
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145 // All the work goes in here:
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146 Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, Array<Method*>* methods, TRAPS);
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147
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148 void compute_index_maps();
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149 void make_constant_pool_cache(TRAPS);
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150 void scan_method(Method* m, bool reverse = false);
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151 void rewrite_Object_init(methodHandle m, TRAPS);
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152 void rewrite_member_reference(address bcp, int offset, bool reverse = false);
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153 void maybe_rewrite_invokehandle(address opc, int cp_index, int cache_index, bool reverse = false);
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154 void rewrite_invokedynamic(address bcp, int offset, bool reverse = false);
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155 void maybe_rewrite_ldc(address bcp, int offset, bool is_wide, bool reverse = false);
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156 // Revert bytecodes in case of an exception.
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157 void restore_bytecodes();
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158
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159 static methodHandle rewrite_jsrs(methodHandle m, TRAPS);
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160 public:
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161 // Driver routine:
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162 static void rewrite(instanceKlassHandle klass, TRAPS);
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163 static void rewrite(instanceKlassHandle klass, constantPoolHandle cpool, Array<Method*>* methods, TRAPS);
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164
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165 // Second pass, not gated by is_rewritten flag
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166 static void relocate_and_link(instanceKlassHandle klass, TRAPS);
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167 // JSR292 version to call with it's own methods.
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168 static void relocate_and_link(instanceKlassHandle klass,
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169 Array<Method*>* methods, TRAPS);
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170
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171 };
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172
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173 #endif // SHARE_VM_INTERPRETER_REWRITER_HPP