Mercurial > hg > truffle
annotate src/share/vm/interpreter/rewriter.hpp @ 10136:cc12becb22e7
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author | dcubed |
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date | Sun, 21 Apr 2013 21:05:02 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_INTERPRETER_REWRITER_HPP |
26 #define SHARE_VM_INTERPRETER_REWRITER_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "runtime/handles.inline.hpp" | |
30 #include "utilities/growableArray.hpp" | |
31 | |
0 | 32 // The Rewriter adds caches to the constant pool and rewrites bytecode indices |
33 // pointing into the constant pool for better interpreter performance. | |
34 | |
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35 class Rewriter: public StackObj { |
0 | 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 entries to the resolved_references map (for invokedynamic and invokehandle only) |
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117 int add_invokedynamic_resolved_references_entries(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 = -1; |
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120 for (int entry = 0; entry < ConstantPoolCacheEntry::_indy_resolved_references_entries; entry++) { |
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121 const int index = _resolved_references_map.append(cp_index); // many-to-one |
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122 assert(index >= _resolved_reference_limit, ""); |
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123 if (entry == 0) { |
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124 ref_index = index; |
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125 } |
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126 assert((index - entry) == ref_index, "entries must be consecutive"); |
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127 _invokedynamic_references_map.at_put_grow(index, cache_index, -1); |
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128 } |
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129 return ref_index; |
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130 } |
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131 |
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132 int resolved_references_entry_to_pool_index(int ref_index) { |
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133 int cp_index = _resolved_references_map[ref_index]; |
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134 return cp_index; |
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135 } |
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136 |
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137 // Access the contents of _cp_cache_map to determine CP cache layout. |
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138 int cp_cache_entry_pool_index(int cache_index) { |
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139 int cp_index = _cp_cache_map[cache_index]; |
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140 return cp_index; |
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141 } |
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142 |
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143 // All the work goes in here: |
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144 Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, Array<Method*>* methods, TRAPS); |
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145 |
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146 void compute_index_maps(); |
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147 void make_constant_pool_cache(TRAPS); |
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148 void scan_method(Method* m, bool reverse = false); |
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149 void rewrite_Object_init(methodHandle m, TRAPS); |
3748 | 150 void rewrite_member_reference(address bcp, int offset, bool reverse = false); |
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151 void maybe_rewrite_invokehandle(address opc, int cp_index, int cache_index, bool reverse = false); |
3748 | 152 void rewrite_invokedynamic(address bcp, int offset, bool reverse = false); |
153 void maybe_rewrite_ldc(address bcp, int offset, bool is_wide, bool reverse = false); | |
154 // Revert bytecodes in case of an exception. | |
155 void restore_bytecodes(); | |
0 | 156 |
3748 | 157 static methodHandle rewrite_jsrs(methodHandle m, TRAPS); |
0 | 158 public: |
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159 // Driver routine: |
0 | 160 static void rewrite(instanceKlassHandle klass, TRAPS); |
161 }; | |
1972 | 162 |
163 #endif // SHARE_VM_INTERPRETER_REWRITER_HPP |