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annotate src/share/vm/interpreter/rewriter.hpp @ 13390:d61a1a166f44

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8028347: Rewriter::scan_method asserts with array oob in RT_Baseline Summary: Fix reversing rewriting for invokespecial Reviewed-by: jrose, hseigel
author coleenp
date Fri, 15 Nov 2013 17:20:22 -0500
parents 41cb10cbfb3c
children 26c3b944dc35
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1 /*
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2 * Copyright (c) 1998, 2013, 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 // For mapping invokedynamic bytecodes, which are discovered during method
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50 // scanning. The invokedynamic entries are added at the end of the cpCache.
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51 // If there are any invokespecial/InterfaceMethodref special case bytecodes,
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52 // these entries are added before invokedynamic entries so that the
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53 // invokespecial bytecode 16 bit index doesn't overflow.
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54 intStack _invokedynamic_cp_cache_map;
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55
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56 // For patching.
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57 GrowableArray<address>* _patch_invokedynamic_bcps;
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58 GrowableArray<int>* _patch_invokedynamic_refs;
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59
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60 void init_maps(int length) {
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61 _cp_map.initialize(length, -1);
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62 // Choose an initial value large enough that we don't get frequent
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63 // calls to grow().
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64 _cp_cache_map.initialize(length/2);
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65 // Also cache resolved objects, in another different cache.
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66 _reference_map.initialize(length, -1);
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67 _resolved_references_map.initialize(length/2);
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68 _invokedynamic_references_map.initialize(length/2);
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69 _resolved_reference_limit = -1;
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70 _first_iteration_cp_cache_limit = -1;
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71
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72 // invokedynamic specific fields
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73 _invokedynamic_cp_cache_map.initialize(length/4);
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74 _patch_invokedynamic_bcps = new GrowableArray<address>(length/4);
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75 _patch_invokedynamic_refs = new GrowableArray<int>(length/4);
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76 }
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77
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78 int _first_iteration_cp_cache_limit;
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79 void record_map_limits() {
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80 // Record initial size of the two arrays generated for the CP cache
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81 // relative to walking the constant pool.
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82 _first_iteration_cp_cache_limit = _cp_cache_map.length();
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83 _resolved_reference_limit = _resolved_references_map.length();
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84 }
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85
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86 int cp_cache_delta() {
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87 // How many cp cache entries were added since recording map limits after
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88 // cp cache initialization?
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89 assert(_first_iteration_cp_cache_limit != -1, "only valid after first iteration");
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90 return _cp_cache_map.length() - _first_iteration_cp_cache_limit;
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91 }
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92
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93 int cp_entry_to_cp_cache(int i) { assert(has_cp_cache(i), "oob"); return _cp_map[i]; }
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94 bool has_cp_cache(int i) { return (uint)i < (uint)_cp_map.length() && _cp_map[i] >= 0; }
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95
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96 int add_map_entry(int cp_index, intArray* cp_map, intStack* cp_cache_map) {
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97 assert(cp_map->at(cp_index) == -1, "not twice on same cp_index");
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98 int cache_index = cp_cache_map->append(cp_index);
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99 cp_map->at_put(cp_index, cache_index);
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100 return cache_index;
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101 }
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102
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103 int add_cp_cache_entry(int cp_index) {
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104 assert(_pool->tag_at(cp_index).value() != JVM_CONSTANT_InvokeDynamic, "use indy version");
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105 assert(_first_iteration_cp_cache_limit == -1, "do not add cache entries after first iteration");
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106 int cache_index = add_map_entry(cp_index, &_cp_map, &_cp_cache_map);
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107 assert(cp_entry_to_cp_cache(cp_index) == cache_index, "");
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108 assert(cp_cache_entry_pool_index(cache_index) == cp_index, "");
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109 return cache_index;
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110 }
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111
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112 int add_invokedynamic_cp_cache_entry(int cp_index) {
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113 assert(_pool->tag_at(cp_index).value() == JVM_CONSTANT_InvokeDynamic, "use non-indy version");
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114 assert(_first_iteration_cp_cache_limit >= 0, "add indy cache entries after first iteration");
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115 // add to the invokedynamic index map.
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116 int cache_index = _invokedynamic_cp_cache_map.append(cp_index);
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117 // do not update _cp_map, since the mapping is one-to-many
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118 assert(invokedynamic_cp_cache_entry_pool_index(cache_index) == cp_index, "");
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119 // this index starts at one but in the bytecode it's appended to the end.
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120 return cache_index + _first_iteration_cp_cache_limit;
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121 }
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122
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123 int invokedynamic_cp_cache_entry_pool_index(int cache_index) {
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124 int cp_index = _invokedynamic_cp_cache_map[cache_index];
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125 return cp_index;
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126 }
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127
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128 // add a new CP cache entry beyond the normal cache for the special case of
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129 // invokespecial with InterfaceMethodref as cpool operand.
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130 int add_invokespecial_cp_cache_entry(int cp_index) {
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131 assert(_first_iteration_cp_cache_limit >= 0, "add these special cache entries after first iteration");
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132 // Don't add InterfaceMethodref if it already exists at the end.
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133 for (int i = _first_iteration_cp_cache_limit; i < _cp_cache_map.length(); i++) {
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134 if (cp_cache_entry_pool_index(i) == cp_index) {
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135 return i;
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136 }
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137 }
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138 int cache_index = _cp_cache_map.append(cp_index);
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139 assert(cache_index >= _first_iteration_cp_cache_limit, "");
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140 // do not update _cp_map, since the mapping is one-to-many
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141 assert(cp_cache_entry_pool_index(cache_index) == cp_index, "");
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142 return cache_index;
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143 }
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144
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145 int cp_entry_to_resolved_references(int cp_index) const {
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146 assert(has_entry_in_resolved_references(cp_index), "oob");
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147 return _reference_map[cp_index];
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148 }
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149 bool has_entry_in_resolved_references(int cp_index) const {
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150 return (uint)cp_index < (uint)_reference_map.length() && _reference_map[cp_index] >= 0;
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151 }
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152
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153 // add a new entry to the resolved_references map
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154 int add_resolved_references_entry(int cp_index) {
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155 int ref_index = add_map_entry(cp_index, &_reference_map, &_resolved_references_map);
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156 assert(cp_entry_to_resolved_references(cp_index) == ref_index, "");
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157 return ref_index;
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158 }
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159
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160 // add a new entries to the resolved_references map (for invokedynamic and invokehandle only)
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161 int add_invokedynamic_resolved_references_entries(int cp_index, int cache_index) {
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162 assert(_resolved_reference_limit >= 0, "must add indy refs after first iteration");
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163 int ref_index = -1;
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164 for (int entry = 0; entry < ConstantPoolCacheEntry::_indy_resolved_references_entries; entry++) {
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165 const int index = _resolved_references_map.append(cp_index); // many-to-one
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166 assert(index >= _resolved_reference_limit, "");
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167 if (entry == 0) {
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168 ref_index = index;
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169 }
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170 assert((index - entry) == ref_index, "entries must be consecutive");
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171 _invokedynamic_references_map.at_put_grow(index, cache_index, -1);
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172 }
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173 return ref_index;
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174 }
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175
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176 int resolved_references_entry_to_pool_index(int ref_index) {
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177 int cp_index = _resolved_references_map[ref_index];
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178 return cp_index;
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179 }
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180
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181 // Access the contents of _cp_cache_map to determine CP cache layout.
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182 int cp_cache_entry_pool_index(int cache_index) {
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183 int cp_index = _cp_cache_map[cache_index];
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184 return cp_index;
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185 }
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186
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187 // All the work goes in here:
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188 Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, Array<Method*>* methods, TRAPS);
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189
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190 void compute_index_maps();
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191 void make_constant_pool_cache(TRAPS);
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192 void scan_method(Method* m, bool reverse, bool* invokespecial_error);
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193 void rewrite_Object_init(methodHandle m, TRAPS);
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194 void rewrite_member_reference(address bcp, int offset, bool reverse);
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195 void maybe_rewrite_invokehandle(address opc, int cp_index, int cache_index, bool reverse);
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196 void rewrite_invokedynamic(address bcp, int offset, bool reverse);
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197 void maybe_rewrite_ldc(address bcp, int offset, bool is_wide, bool reverse);
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198 void rewrite_invokespecial(address bcp, int offset, bool reverse, bool* invokespecial_error);
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199
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200 void patch_invokedynamic_bytecodes();
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201
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202 // Revert bytecodes in case of an exception.
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203 void restore_bytecodes();
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204
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205 static methodHandle rewrite_jsrs(methodHandle m, TRAPS);
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206 public:
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207 // Driver routine:
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208 static void rewrite(instanceKlassHandle klass, TRAPS);
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209 };
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210
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211 #endif // SHARE_VM_INTERPRETER_REWRITER_HPP