Mercurial > hg > truffle
annotate src/share/vm/oops/constantPool.hpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | 096c224171c4 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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_OOPS_CONSTANTPOOLOOP_HPP |
26 #define SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP | |
27 | |
28 #include "oops/arrayOop.hpp" | |
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29 #include "oops/cpCache.hpp" |
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30 #include "oops/objArrayOop.hpp" |
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31 #include "oops/symbol.hpp" |
1972 | 32 #include "oops/typeArrayOop.hpp" |
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33 #include "runtime/handles.hpp" |
1972 | 34 #include "utilities/constantTag.hpp" |
35 #ifdef TARGET_ARCH_x86 | |
36 # include "bytes_x86.hpp" | |
37 #endif | |
38 #ifdef TARGET_ARCH_sparc | |
39 # include "bytes_sparc.hpp" | |
40 #endif | |
41 #ifdef TARGET_ARCH_zero | |
42 # include "bytes_zero.hpp" | |
43 #endif | |
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44 #ifdef TARGET_ARCH_arm |
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45 # include "bytes_arm.hpp" |
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46 #endif |
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47 #ifdef TARGET_ARCH_ppc |
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48 # include "bytes_ppc.hpp" |
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49 #endif |
1972 | 50 |
0 | 51 // A constantPool is an array containing class constants as described in the |
52 // class file. | |
53 // | |
54 // Most of the constant pool entries are written during class parsing, which | |
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55 // is safe. For klass types, the constant pool entry is |
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56 // modified when the entry is resolved. If a klass constant pool |
0 | 57 // entry is read without a lock, only the resolved state guarantees that |
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58 // the entry in the constant pool is a klass object and not a Symbol*. |
0 | 59 |
60 class SymbolHashMap; | |
61 | |
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62 class CPSlot VALUE_OBJ_CLASS_SPEC { |
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63 intptr_t _ptr; |
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64 public: |
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65 CPSlot(intptr_t ptr): _ptr(ptr) {} |
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66 CPSlot(Klass* ptr): _ptr((intptr_t)ptr) {} |
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67 CPSlot(Symbol* ptr): _ptr((intptr_t)ptr | 1) {} |
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68 |
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69 intptr_t value() { return _ptr; } |
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70 bool is_resolved() { return (_ptr & 1) == 0; } |
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71 bool is_unresolved() { return (_ptr & 1) == 1; } |
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72 |
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73 Symbol* get_symbol() { |
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74 assert(is_unresolved(), "bad call"); |
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75 return (Symbol*)(_ptr & ~1); |
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76 } |
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77 Klass* get_klass() { |
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78 assert(is_resolved(), "bad call"); |
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79 return (Klass*)_ptr; |
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80 } |
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81 }; |
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82 |
7956 | 83 class KlassSizeStats; |
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84 class ConstantPool : public Metadata { |
0 | 85 friend class VMStructs; |
86 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast | |
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87 friend class Universe; // For null constructor |
0 | 88 private: |
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89 Array<u1>* _tags; // the tag array describing the constant pool's contents |
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90 ConstantPoolCache* _cache; // the cache holding interpreter runtime information |
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91 InstanceKlass* _pool_holder; // the corresponding class |
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92 Array<u2>* _operands; // for variable-sized (InvokeDynamic) nodes, usually empty |
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93 |
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94 // Array of resolved objects from the constant pool and map from resolved |
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95 // object index to original constant pool index |
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96 jobject _resolved_references; |
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97 Array<u2>* _reference_map; |
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98 |
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99 enum { |
8104 | 100 _has_preresolution = 1, // Flags |
101 _on_stack = 2 | |
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102 }; |
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103 |
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104 int _flags; // old fashioned bit twiddling |
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105 int _length; // number of elements in the array |
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106 |
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107 union { |
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108 // set for CDS to restore resolved references |
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109 int _resolved_reference_length; |
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110 // keeps version number for redefined classes (used in backtrace) |
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111 int _version; |
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112 } _saved; |
0 | 113 |
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114 Monitor* _lock; |
0 | 115 |
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116 void set_tags(Array<u1>* tags) { _tags = tags; } |
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117 void tag_at_put(int which, jbyte t) { tags()->at_put(which, t); } |
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118 void release_tag_at_put(int which, jbyte t) { tags()->release_at_put(which, t); } |
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119 |
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120 void set_operands(Array<u2>* operands) { _operands = operands; } |
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121 |
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122 int flags() const { return _flags; } |
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123 void set_flags(int f) { _flags = f; } |
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124 |
0 | 125 private: |
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126 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(ConstantPool)); } |
0 | 127 |
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128 CPSlot slot_at(int which) { |
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129 assert(is_within_bounds(which), "index out of bounds"); |
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130 // Uses volatile because the klass slot changes without a lock. |
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131 volatile intptr_t adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which)); |
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132 assert(adr != 0 || which == 0, "cp entry for klass should not be zero"); |
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133 return CPSlot(adr); |
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134 } |
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135 |
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136 void slot_at_put(int which, CPSlot s) const { |
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137 assert(is_within_bounds(which), "index out of bounds"); |
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138 assert(s.value() != 0, "Caught something"); |
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139 *(intptr_t*)&base()[which] = s.value(); |
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140 } |
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141 intptr_t* obj_at_addr_raw(int which) const { |
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142 assert(is_within_bounds(which), "index out of bounds"); |
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143 return (intptr_t*) &base()[which]; |
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144 } |
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145 |
0 | 146 jint* int_at_addr(int which) const { |
147 assert(is_within_bounds(which), "index out of bounds"); | |
148 return (jint*) &base()[which]; | |
149 } | |
150 | |
151 jlong* long_at_addr(int which) const { | |
152 assert(is_within_bounds(which), "index out of bounds"); | |
153 return (jlong*) &base()[which]; | |
154 } | |
155 | |
156 jfloat* float_at_addr(int which) const { | |
157 assert(is_within_bounds(which), "index out of bounds"); | |
158 return (jfloat*) &base()[which]; | |
159 } | |
160 | |
161 jdouble* double_at_addr(int which) const { | |
162 assert(is_within_bounds(which), "index out of bounds"); | |
163 return (jdouble*) &base()[which]; | |
164 } | |
165 | |
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166 ConstantPool(Array<u1>* tags); |
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167 ConstantPool() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } |
0 | 168 public: |
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169 static ConstantPool* allocate(ClassLoaderData* loader_data, int length, TRAPS); |
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170 |
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171 bool is_constantPool() const volatile { return true; } |
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172 |
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173 Array<u1>* tags() const { return _tags; } |
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174 Array<u2>* operands() const { return _operands; } |
0 | 175 |
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176 bool has_preresolution() const { return (_flags & _has_preresolution) != 0; } |
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177 void set_has_preresolution() { _flags |= _has_preresolution; } |
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178 |
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179 // Redefine classes support. If a method refering to this constant pool |
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180 // is on the executing stack, or as a handle in vm code, this constant pool |
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181 // can't be removed from the set of previous versions saved in the instance |
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182 // class. |
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183 bool on_stack() const { return (_flags &_on_stack) != 0; } |
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184 void set_on_stack(const bool value); |
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185 |
0 | 186 // Klass holding pool |
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187 InstanceKlass* pool_holder() const { return _pool_holder; } |
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188 void set_pool_holder(InstanceKlass* k) { _pool_holder = k; } |
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189 InstanceKlass** pool_holder_addr() { return &_pool_holder; } |
0 | 190 |
191 // Interpreter runtime support | |
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192 ConstantPoolCache* cache() const { return _cache; } |
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193 void set_cache(ConstantPoolCache* cache){ _cache = cache; } |
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194 |
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195 // Create object cache in the constant pool |
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196 void initialize_resolved_references(ClassLoaderData* loader_data, |
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197 intStack reference_map, |
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198 int constant_pool_map_length, |
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199 TRAPS); |
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200 |
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201 // resolved strings, methodHandles and callsite objects from the constant pool |
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202 objArrayOop resolved_references() const; |
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203 // mapping resolved object array indexes to cp indexes and back. |
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204 int object_to_cp_index(int index) { return _reference_map->at(index); } |
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205 int cp_to_object_index(int index); |
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206 |
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207 // Invokedynamic indexes. |
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208 // They must look completely different from normal indexes. |
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209 // The main reason is that byte swapping is sometimes done on normal indexes. |
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210 // Finally, it is helpful for debugging to tell the two apart. |
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211 static bool is_invokedynamic_index(int i) { return (i < 0); } |
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212 static int decode_invokedynamic_index(int i) { assert(is_invokedynamic_index(i), ""); return ~i; } |
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213 static int encode_invokedynamic_index(int i) { assert(!is_invokedynamic_index(i), ""); return ~i; } |
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214 |
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215 |
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216 // The invokedynamic points at a CP cache entry. This entry points back |
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217 // at the original CP entry (CONSTANT_InvokeDynamic) and also (via f2) at an entry |
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218 // in the resolved_references array (which provides the appendix argument). |
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219 int invokedynamic_cp_cache_index(int index) const { |
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220 assert (is_invokedynamic_index(index), "should be a invokedynamic index"); |
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221 int cache_index = decode_invokedynamic_index(index); |
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222 return cache_index; |
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223 } |
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224 ConstantPoolCacheEntry* invokedynamic_cp_cache_entry_at(int index) const { |
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225 // decode index that invokedynamic points to. |
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226 int cp_cache_index = invokedynamic_cp_cache_index(index); |
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227 return cache()->entry_at(cp_cache_index); |
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228 } |
0 | 229 |
230 // Assembly code support | |
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231 static int tags_offset_in_bytes() { return offset_of(ConstantPool, _tags); } |
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232 static int cache_offset_in_bytes() { return offset_of(ConstantPool, _cache); } |
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233 static int pool_holder_offset_in_bytes() { return offset_of(ConstantPool, _pool_holder); } |
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234 static int resolved_references_offset_in_bytes() { return offset_of(ConstantPool, _resolved_references); } |
0 | 235 |
236 // Storing constants | |
237 | |
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238 void klass_at_put(int which, Klass* k) { |
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239 assert(k != NULL, "resolved class shouldn't be null"); |
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240 assert(is_within_bounds(which), "index out of bounds"); |
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241 OrderAccess::release_store_ptr((Klass* volatile *)obj_at_addr_raw(which), k); |
0 | 242 // The interpreter assumes when the tag is stored, the klass is resolved |
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243 // and the Klass* is a klass rather than a Symbol*, so we need |
0 | 244 // hardware store ordering here. |
245 release_tag_at_put(which, JVM_CONSTANT_Class); | |
246 } | |
247 | |
248 // For temporary use while constructing constant pool | |
249 void klass_index_at_put(int which, int name_index) { | |
250 tag_at_put(which, JVM_CONSTANT_ClassIndex); | |
251 *int_at_addr(which) = name_index; | |
252 } | |
253 | |
254 // Temporary until actual use | |
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255 void unresolved_klass_at_put(int which, Symbol* s) { |
0 | 256 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass); |
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257 slot_at_put(which, s); |
0 | 258 } |
259 | |
1602 | 260 void method_handle_index_at_put(int which, int ref_kind, int ref_index) { |
261 tag_at_put(which, JVM_CONSTANT_MethodHandle); | |
262 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind; | |
263 } | |
264 | |
265 void method_type_index_at_put(int which, int ref_index) { | |
266 tag_at_put(which, JVM_CONSTANT_MethodType); | |
267 *int_at_addr(which) = ref_index; | |
268 } | |
269 | |
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270 void invoke_dynamic_at_put(int which, int bootstrap_specifier_index, int name_and_type_index) { |
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271 tag_at_put(which, JVM_CONSTANT_InvokeDynamic); |
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272 *int_at_addr(which) = ((jint) name_and_type_index<<16) | bootstrap_specifier_index; |
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273 } |
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274 |
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275 void unresolved_string_at_put(int which, Symbol* s) { |
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276 release_tag_at_put(which, JVM_CONSTANT_String); |
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277 *symbol_at_addr(which) = s; |
0 | 278 } |
279 | |
280 void int_at_put(int which, jint i) { | |
281 tag_at_put(which, JVM_CONSTANT_Integer); | |
282 *int_at_addr(which) = i; | |
283 } | |
284 | |
285 void long_at_put(int which, jlong l) { | |
286 tag_at_put(which, JVM_CONSTANT_Long); | |
287 // *long_at_addr(which) = l; | |
288 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l)); | |
289 } | |
290 | |
291 void float_at_put(int which, jfloat f) { | |
292 tag_at_put(which, JVM_CONSTANT_Float); | |
293 *float_at_addr(which) = f; | |
294 } | |
295 | |
296 void double_at_put(int which, jdouble d) { | |
297 tag_at_put(which, JVM_CONSTANT_Double); | |
298 // *double_at_addr(which) = d; | |
299 // u8 temp = *(u8*) &d; | |
300 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d)); | |
301 } | |
302 | |
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303 Symbol** symbol_at_addr(int which) const { |
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304 assert(is_within_bounds(which), "index out of bounds"); |
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305 return (Symbol**) &base()[which]; |
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306 } |
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307 |
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308 void symbol_at_put(int which, Symbol* s) { |
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309 assert(s->refcount() != 0, "should have nonzero refcount"); |
0 | 310 tag_at_put(which, JVM_CONSTANT_Utf8); |
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311 *symbol_at_addr(which) = s; |
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312 } |
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313 |
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314 void string_at_put(int which, int obj_index, oop str) { |
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315 resolved_references()->obj_at_put(obj_index, str); |
0 | 316 } |
317 | |
318 // For temporary use while constructing constant pool | |
319 void string_index_at_put(int which, int string_index) { | |
320 tag_at_put(which, JVM_CONSTANT_StringIndex); | |
321 *int_at_addr(which) = string_index; | |
322 } | |
323 | |
324 void field_at_put(int which, int class_index, int name_and_type_index) { | |
325 tag_at_put(which, JVM_CONSTANT_Fieldref); | |
326 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
327 } | |
328 | |
329 void method_at_put(int which, int class_index, int name_and_type_index) { | |
330 tag_at_put(which, JVM_CONSTANT_Methodref); | |
331 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
332 } | |
333 | |
334 void interface_method_at_put(int which, int class_index, int name_and_type_index) { | |
335 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref); | |
336 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice | |
337 } | |
338 | |
339 void name_and_type_at_put(int which, int name_index, int signature_index) { | |
340 tag_at_put(which, JVM_CONSTANT_NameAndType); | |
341 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice | |
342 } | |
343 | |
344 // Tag query | |
345 | |
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346 constantTag tag_at(int which) const { return (constantTag)tags()->at_acquire(which); } |
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347 |
0 | 348 // Fetching constants |
349 | |
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350 Klass* klass_at(int which, TRAPS) { |
0 | 351 constantPoolHandle h_this(THREAD, this); |
352 return klass_at_impl(h_this, which, CHECK_NULL); | |
353 } | |
354 | |
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355 Symbol* klass_name_at(int which); // Returns the name, w/o resolving. |
0 | 356 |
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357 Klass* resolved_klass_at(int which) const { // Used by Compiler |
0 | 358 guarantee(tag_at(which).is_klass(), "Corrupted constant pool"); |
359 // Must do an acquire here in case another thread resolved the klass | |
360 // behind our back, lest we later load stale values thru the oop. | |
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361 return CPSlot((Klass*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_klass(); |
0 | 362 } |
363 | |
364 // This method should only be used with a cpool lock or during parsing or gc | |
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365 Symbol* unresolved_klass_at(int which) { // Temporary until actual use |
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366 Symbol* s = CPSlot((Symbol*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol(); |
0 | 367 // check that the klass is still unresolved. |
368 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool"); | |
369 return s; | |
370 } | |
371 | |
372 // RedefineClasses() API support: | |
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373 Symbol* klass_at_noresolve(int which) { return klass_name_at(which); } |
0 | 374 |
375 jint int_at(int which) { | |
376 assert(tag_at(which).is_int(), "Corrupted constant pool"); | |
377 return *int_at_addr(which); | |
378 } | |
379 | |
380 jlong long_at(int which) { | |
381 assert(tag_at(which).is_long(), "Corrupted constant pool"); | |
382 // return *long_at_addr(which); | |
383 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
384 return *((jlong*)&tmp); | |
385 } | |
386 | |
387 jfloat float_at(int which) { | |
388 assert(tag_at(which).is_float(), "Corrupted constant pool"); | |
389 return *float_at_addr(which); | |
390 } | |
391 | |
392 jdouble double_at(int which) { | |
393 assert(tag_at(which).is_double(), "Corrupted constant pool"); | |
394 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
395 return *((jdouble*)&tmp); | |
396 } | |
397 | |
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398 Symbol* symbol_at(int which) { |
0 | 399 assert(tag_at(which).is_utf8(), "Corrupted constant pool"); |
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400 return *symbol_at_addr(which); |
0 | 401 } |
402 | |
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403 oop string_at(int which, int obj_index, TRAPS) { |
0 | 404 constantPoolHandle h_this(THREAD, this); |
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405 return string_at_impl(h_this, which, obj_index, THREAD); |
0 | 406 } |
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407 oop string_at(int which, TRAPS) { |
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408 int obj_index = cp_to_object_index(which); |
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409 return string_at(which, obj_index, THREAD); |
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410 } |
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411 |
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412 // Version that can be used before string oop array is created. |
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413 oop uncached_string_at(int which, TRAPS); |
0 | 414 |
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415 // A "pseudo-string" is an non-string oop that has found is way into |
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416 // a String entry. |
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417 // Under EnableInvokeDynamic this can happen if the user patches a live |
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418 // object into a CONSTANT_String entry of an anonymous class. |
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419 // Method oops internally created for method handles may also |
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420 // use pseudo-strings to link themselves to related metaobjects. |
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421 |
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422 bool is_pseudo_string_at(int which) { |
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423 // A pseudo string is a string that doesn't have a symbol in the cpSlot |
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424 return unresolved_string_at(which) == NULL; |
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425 } |
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426 |
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427 oop pseudo_string_at(int which, int obj_index) { |
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428 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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429 assert(unresolved_string_at(which) == NULL, "shouldn't have symbol"); |
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430 oop s = resolved_references()->obj_at(obj_index); |
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431 return s; |
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432 } |
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433 |
8104 | 434 oop pseudo_string_at(int which) { |
435 assert(tag_at(which).is_string(), "Corrupted constant pool"); | |
436 assert(unresolved_string_at(which) == NULL, "shouldn't have symbol"); | |
437 int obj_index = cp_to_object_index(which); | |
438 oop s = resolved_references()->obj_at(obj_index); | |
439 return s; | |
440 } | |
441 | |
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442 void pseudo_string_at_put(int which, int obj_index, oop x) { |
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443 assert(EnableInvokeDynamic, ""); |
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444 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
8104 | 445 unresolved_string_at_put(which, NULL); // indicates patched string |
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446 string_at_put(which, obj_index, x); // this works just fine |
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447 } |
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448 |
0 | 449 // only called when we are sure a string entry is already resolved (via an |
450 // earlier string_at call. | |
451 oop resolved_string_at(int which) { | |
452 assert(tag_at(which).is_string(), "Corrupted constant pool"); | |
453 // Must do an acquire here in case another thread resolved the klass | |
454 // behind our back, lest we later load stale values thru the oop. | |
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455 // we might want a volatile_obj_at in ObjArrayKlass. |
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456 int obj_index = cp_to_object_index(which); |
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457 return resolved_references()->obj_at(obj_index); |
0 | 458 } |
459 | |
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460 Symbol* unresolved_string_at(int which) { |
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461 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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462 Symbol* s = *symbol_at_addr(which); |
0 | 463 return s; |
464 } | |
465 | |
466 // Returns an UTF8 for a CONSTANT_String entry at a given index. | |
467 // UTF8 char* representation was chosen to avoid conversion of | |
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468 // java_lang_Strings at resolved entries into Symbol*s |
0 | 469 // or vice versa. |
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470 // Caller is responsible for checking for pseudo-strings. |
0 | 471 char* string_at_noresolve(int which); |
472 | |
473 jint name_and_type_at(int which) { | |
474 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool"); | |
475 return *int_at_addr(which); | |
476 } | |
477 | |
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478 private: |
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479 int method_handle_ref_kind_at(int which, bool error_ok) { |
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480 assert(tag_at(which).is_method_handle() || |
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481 (error_ok && tag_at(which).is_method_handle_in_error()), "Corrupted constant pool"); |
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482 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits |
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483 } |
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484 int method_handle_index_at(int which, bool error_ok) { |
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485 assert(tag_at(which).is_method_handle() || |
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486 (error_ok && tag_at(which).is_method_handle_in_error()), "Corrupted constant pool"); |
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487 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits |
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488 } |
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489 int method_type_index_at(int which, bool error_ok) { |
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490 assert(tag_at(which).is_method_type() || |
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491 (error_ok && tag_at(which).is_method_type_in_error()), "Corrupted constant pool"); |
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492 return *int_at_addr(which); |
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493 } |
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494 public: |
1602 | 495 int method_handle_ref_kind_at(int which) { |
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496 return method_handle_ref_kind_at(which, false); |
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497 } |
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498 int method_handle_ref_kind_at_error_ok(int which) { |
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499 return method_handle_ref_kind_at(which, true); |
1602 | 500 } |
501 int method_handle_index_at(int which) { | |
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502 return method_handle_index_at(which, false); |
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503 } |
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504 int method_handle_index_at_error_ok(int which) { |
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505 return method_handle_index_at(which, true); |
1602 | 506 } |
507 int method_type_index_at(int which) { | |
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508 return method_type_index_at(which, false); |
1602 | 509 } |
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510 int method_type_index_at_error_ok(int which) { |
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511 return method_type_index_at(which, true); |
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512 } |
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513 |
1602 | 514 // Derived queries: |
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515 Symbol* method_handle_name_ref_at(int which) { |
1602 | 516 int member = method_handle_index_at(which); |
517 return impl_name_ref_at(member, true); | |
518 } | |
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519 Symbol* method_handle_signature_ref_at(int which) { |
1602 | 520 int member = method_handle_index_at(which); |
521 return impl_signature_ref_at(member, true); | |
522 } | |
523 int method_handle_klass_index_at(int which) { | |
524 int member = method_handle_index_at(which); | |
525 return impl_klass_ref_index_at(member, true); | |
526 } | |
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527 Symbol* method_type_signature_at(int which) { |
1602 | 528 int sym = method_type_index_at(which); |
529 return symbol_at(sym); | |
530 } | |
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531 |
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532 int invoke_dynamic_name_and_type_ref_index_at(int which) { |
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533 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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534 return extract_high_short_from_int(*int_at_addr(which)); |
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535 } |
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536 int invoke_dynamic_bootstrap_specifier_index(int which) { |
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537 assert(tag_at(which).value() == JVM_CONSTANT_InvokeDynamic, "Corrupted constant pool"); |
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538 return extract_low_short_from_int(*int_at_addr(which)); |
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539 } |
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540 int invoke_dynamic_operand_base(int which) { |
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541 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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542 return operand_offset_at(operands(), bootstrap_specifier_index); |
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543 } |
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544 // The first part of the operands array consists of an index into the second part. |
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545 // Extract a 32-bit index value from the first part. |
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546 static int operand_offset_at(Array<u2>* operands, int bootstrap_specifier_index) { |
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547 int n = (bootstrap_specifier_index * 2); |
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548 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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549 // The first 32-bit index points to the beginning of the second part |
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550 // of the operands array. Make sure this index is in the first part. |
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551 DEBUG_ONLY(int second_part = build_int_from_shorts(operands->at(0), |
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552 operands->at(1))); |
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553 assert(second_part == 0 || n+2 <= second_part, "oob (2)"); |
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554 int offset = build_int_from_shorts(operands->at(n+0), |
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555 operands->at(n+1)); |
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556 // The offset itself must point into the second part of the array. |
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557 assert(offset == 0 || offset >= second_part && offset <= operands->length(), "oob (3)"); |
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558 return offset; |
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559 } |
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560 static void operand_offset_at_put(Array<u2>* operands, int bootstrap_specifier_index, int offset) { |
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561 int n = bootstrap_specifier_index * 2; |
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562 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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563 operands->at_put(n+0, extract_low_short_from_int(offset)); |
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564 operands->at_put(n+1, extract_high_short_from_int(offset)); |
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565 } |
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566 static int operand_array_length(Array<u2>* operands) { |
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567 if (operands == NULL || operands->length() == 0) return 0; |
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568 int second_part = operand_offset_at(operands, 0); |
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569 return (second_part / 2); |
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570 } |
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571 |
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572 #ifdef ASSERT |
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573 // operand tuples fit together exactly, end to end |
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574 static int operand_limit_at(Array<u2>* operands, int bootstrap_specifier_index) { |
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575 int nextidx = bootstrap_specifier_index + 1; |
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576 if (nextidx == operand_array_length(operands)) |
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577 return operands->length(); |
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578 else |
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579 return operand_offset_at(operands, nextidx); |
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580 } |
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581 int invoke_dynamic_operand_limit(int which) { |
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582 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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583 return operand_limit_at(operands(), bootstrap_specifier_index); |
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584 } |
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585 #endif //ASSERT |
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586 |
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587 // layout of InvokeDynamic bootstrap method specifier (in second part of operands array): |
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588 enum { |
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589 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm |
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590 _indy_argc_offset = 1, // u2 argc |
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591 _indy_argv_offset = 2 // u2 argv[argc] |
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592 }; |
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593 |
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594 // These functions are used in RedefineClasses for CP merge |
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595 |
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596 int operand_offset_at(int bootstrap_specifier_index) { |
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597 assert(0 <= bootstrap_specifier_index && |
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598 bootstrap_specifier_index < operand_array_length(operands()), |
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599 "Corrupted CP operands"); |
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600 return operand_offset_at(operands(), bootstrap_specifier_index); |
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601 } |
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602 int operand_bootstrap_method_ref_index_at(int bootstrap_specifier_index) { |
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603 int offset = operand_offset_at(bootstrap_specifier_index); |
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604 return operands()->at(offset + _indy_bsm_offset); |
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605 } |
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606 int operand_argument_count_at(int bootstrap_specifier_index) { |
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607 int offset = operand_offset_at(bootstrap_specifier_index); |
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608 int argc = operands()->at(offset + _indy_argc_offset); |
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609 return argc; |
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610 } |
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611 int operand_argument_index_at(int bootstrap_specifier_index, int j) { |
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612 int offset = operand_offset_at(bootstrap_specifier_index); |
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613 return operands()->at(offset + _indy_argv_offset + j); |
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614 } |
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615 int operand_next_offset_at(int bootstrap_specifier_index) { |
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616 int offset = operand_offset_at(bootstrap_specifier_index) + _indy_argv_offset |
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617 + operand_argument_count_at(bootstrap_specifier_index); |
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618 return offset; |
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619 } |
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620 // Compare a bootsrap specifier in the operands arrays |
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621 bool compare_operand_to(int bootstrap_specifier_index1, constantPoolHandle cp2, |
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622 int bootstrap_specifier_index2, TRAPS); |
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623 // Find a bootsrap specifier in the operands array |
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624 int find_matching_operand(int bootstrap_specifier_index, constantPoolHandle search_cp, |
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625 int operands_cur_len, TRAPS); |
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626 // Resize the operands array with delta_len and delta_size |
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627 void resize_operands(int delta_len, int delta_size, TRAPS); |
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628 // Extend the operands array with the length and size of the ext_cp operands |
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629 void extend_operands(constantPoolHandle ext_cp, TRAPS); |
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630 // Shrink the operands array to a smaller array with new_len length |
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631 void shrink_operands(int new_len, TRAPS); |
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632 |
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633 |
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634 int invoke_dynamic_bootstrap_method_ref_index_at(int which) { |
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635 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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636 int op_base = invoke_dynamic_operand_base(which); |
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637 return operands()->at(op_base + _indy_bsm_offset); |
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638 } |
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639 int invoke_dynamic_argument_count_at(int which) { |
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640 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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641 int op_base = invoke_dynamic_operand_base(which); |
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642 int argc = operands()->at(op_base + _indy_argc_offset); |
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643 DEBUG_ONLY(int end_offset = op_base + _indy_argv_offset + argc; |
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644 int next_offset = invoke_dynamic_operand_limit(which)); |
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645 assert(end_offset == next_offset, "matched ending"); |
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646 return argc; |
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647 } |
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648 int invoke_dynamic_argument_index_at(int which, int j) { |
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649 int op_base = invoke_dynamic_operand_base(which); |
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650 DEBUG_ONLY(int argc = operands()->at(op_base + _indy_argc_offset)); |
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651 assert((uint)j < (uint)argc, "oob"); |
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652 return operands()->at(op_base + _indy_argv_offset + j); |
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653 } |
1602 | 654 |
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655 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve, |
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656 // name_and_type_ref_index_at) all expect to be passed indices obtained |
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657 // directly from the bytecode. |
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658 // If the indices are meant to refer to fields or methods, they are |
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659 // actually rewritten constant pool cache indices. |
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660 // The routine remap_instruction_operand_from_cache manages the adjustment |
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661 // of these values back to constant pool indices. |
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662 |
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663 // There are also "uncached" versions which do not adjust the operand index; see below. |
0 | 664 |
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665 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear. |
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666 // In a few cases (the verifier) there are uses before a cpcache has been built, |
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667 // which are handled by a dynamic check in remap_instruction_operand_from_cache. |
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668 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode. |
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669 |
0 | 670 // Lookup for entries consisting of (klass_index, name_and_type index) |
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671 Klass* klass_ref_at(int which, TRAPS); |
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672 Symbol* klass_ref_at_noresolve(int which); |
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673 Symbol* name_ref_at(int which) { return impl_name_ref_at(which, false); } |
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674 Symbol* signature_ref_at(int which) { return impl_signature_ref_at(which, false); } |
0 | 675 |
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676 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); } |
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677 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); } |
0 | 678 |
679 // Lookup for entries consisting of (name_index, signature_index) | |
726
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680 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt) |
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681 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt) |
0 | 682 |
683 BasicType basic_type_for_signature_at(int which); | |
684 | |
685 // Resolve string constants (to prevent allocation during compilation) | |
686 void resolve_string_constants(TRAPS) { | |
687 constantPoolHandle h_this(THREAD, this); | |
688 resolve_string_constants_impl(h_this, CHECK); | |
689 } | |
690 | |
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691 // CDS support |
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692 void remove_unshareable_info(); |
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693 void restore_unshareable_info(TRAPS); |
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694 bool resolve_class_constants(TRAPS); |
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695 // The ConstantPool vtable is restored by this call when the ConstantPool is |
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696 // in the shared archive. See patch_klass_vtables() in metaspaceShared.cpp for |
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697 // all the gory details. SA, dtrace and pstack helpers distinguish metadata |
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698 // by their vtable. |
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699 void restore_vtable() { guarantee(is_constantPool(), "vtable restored by this call"); } |
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700 |
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701 private: |
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702 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 }; |
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703 public: |
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704 |
1602 | 705 // Resolve late bound constants. |
706 oop resolve_constant_at(int index, TRAPS) { | |
707 constantPoolHandle h_this(THREAD, this); | |
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708 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD); |
1602 | 709 } |
710 | |
711 oop resolve_cached_constant_at(int cache_index, TRAPS) { | |
712 constantPoolHandle h_this(THREAD, this); | |
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713 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD); |
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714 } |
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715 |
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716 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) { |
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717 constantPoolHandle h_this(THREAD, this); |
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718 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD); |
1602 | 719 } |
720 | |
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721 oop resolve_bootstrap_specifier_at(int index, TRAPS) { |
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722 constantPoolHandle h_this(THREAD, this); |
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723 return resolve_bootstrap_specifier_at_impl(h_this, index, THREAD); |
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724 } |
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725 |
0 | 726 // Klass name matches name at offset |
727 bool klass_name_at_matches(instanceKlassHandle k, int which); | |
728 | |
729 // Sizing | |
113
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730 int length() const { return _length; } |
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731 void set_length(int length) { _length = length; } |
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732 |
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733 // Tells whether index is within bounds. |
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734 bool is_within_bounds(int index) const { |
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735 return 0 <= index && index < length(); |
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736 } |
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737 |
7956 | 738 // Sizing (in words) |
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739 static int header_size() { return sizeof(ConstantPool)/HeapWordSize; } |
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740 static int size(int length) { return align_object_size(header_size() + length); } |
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741 int size() const { return size(length()); } |
7956 | 742 #if INCLUDE_SERVICES |
743 void collect_statistics(KlassSizeStats *sz) const; | |
744 #endif | |
0 | 745 |
746 friend class ClassFileParser; | |
747 friend class SystemDictionary; | |
748 | |
749 // Used by compiler to prevent classloading. | |
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750 static Method* method_at_if_loaded (constantPoolHandle this_oop, int which); |
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751 static bool has_appendix_at_if_loaded (constantPoolHandle this_oop, int which); |
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752 static oop appendix_at_if_loaded (constantPoolHandle this_oop, int which); |
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753 static bool has_method_type_at_if_loaded (constantPoolHandle this_oop, int which); |
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754 static oop method_type_at_if_loaded (constantPoolHandle this_oop, int which); |
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755 static Klass* klass_at_if_loaded (constantPoolHandle this_oop, int which); |
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756 static Klass* klass_ref_at_if_loaded (constantPoolHandle this_oop, int which); |
0 | 757 |
758 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the | |
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759 // future by other Java code. These take constant pool indices rather than |
0 | 760 // constant pool cache indices as do the peer methods above. |
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761 Symbol* uncached_klass_ref_at_noresolve(int which); |
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762 Symbol* uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); } |
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763 Symbol* uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); } |
726
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764 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); } |
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765 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); } |
0 | 766 |
767 // Sharing | |
768 int pre_resolve_shared_klasses(TRAPS); | |
769 | |
770 // Debugging | |
771 const char* printable_name_at(int which) PRODUCT_RETURN0; | |
772 | |
1565 | 773 #ifdef ASSERT |
774 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices | |
1602 | 775 #else |
776 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op | |
1565 | 777 #endif //ASSERT |
778 | |
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779 static int decode_cpcache_index(int raw_index, bool invokedynamic_ok = false) { |
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780 if (invokedynamic_ok && is_invokedynamic_index(raw_index)) |
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781 return decode_invokedynamic_index(raw_index); |
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782 else |
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783 return raw_index - CPCACHE_INDEX_TAG; |
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784 } |
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785 |
0 | 786 private: |
787 | |
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788 void set_resolved_references(jobject s) { _resolved_references = s; } |
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789 Array<u2>* reference_map() const { return _reference_map; } |
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790 void set_reference_map(Array<u2>* o) { _reference_map = o; } |
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791 |
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792 // patch JSR 292 resolved references after the class is linked. |
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793 void patch_resolved_references(GrowableArray<Handle>* cp_patches); |
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794 |
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795 Symbol* impl_name_ref_at(int which, bool uncached); |
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796 Symbol* impl_signature_ref_at(int which, bool uncached); |
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797 int impl_klass_ref_index_at(int which, bool uncached); |
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798 int impl_name_and_type_ref_index_at(int which, bool uncached); |
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799 |
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800 public: |
1565 | 801 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG |
0 | 802 |
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803 private: |
0 | 804 // Used while constructing constant pool (only by ClassFileParser) |
805 jint klass_index_at(int which) { | |
806 assert(tag_at(which).is_klass_index(), "Corrupted constant pool"); | |
807 return *int_at_addr(which); | |
808 } | |
809 | |
810 jint string_index_at(int which) { | |
811 assert(tag_at(which).is_string_index(), "Corrupted constant pool"); | |
812 return *int_at_addr(which); | |
813 } | |
814 | |
815 // Performs the LinkResolver checks | |
816 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS); | |
817 | |
818 // Implementation of methods that needs an exposed 'this' pointer, in order to | |
819 // handle GC while executing the method | |
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820 static Klass* klass_at_impl(constantPoolHandle this_oop, int which, TRAPS); |
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821 static oop string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS); |
0 | 822 |
823 // Resolve string constants (to prevent allocation during compilation) | |
824 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS); | |
825 | |
1602 | 826 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS); |
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827 static void save_and_throw_exception(constantPoolHandle this_oop, int which, int tag_value, TRAPS); |
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828 static oop resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS); |
1602 | 829 |
0 | 830 public: |
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831 // Merging ConstantPool* support: |
0 | 832 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS); |
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833 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS) { |
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834 constantPoolHandle h_this(THREAD, this); |
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835 copy_cp_to_impl(h_this, start_i, end_i, to_cp, to_i, THREAD); |
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836 } |
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837 static void copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS); |
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838 static void copy_entry_to(constantPoolHandle from_cp, int from_i, constantPoolHandle to_cp, int to_i, TRAPS); |
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839 static void copy_operands(constantPoolHandle from_cp, constantPoolHandle to_cp, TRAPS); |
0 | 840 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS); |
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841 int version() const { return _saved._version; } |
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842 void set_version(int version) { _saved._version = version; } |
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843 void increment_and_save_version(int version) { |
7625 | 844 _saved._version = version >= 0 ? (version + 1) : version; // keep overflow |
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845 } |
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846 |
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847 void set_resolved_reference_length(int length) { _saved._resolved_reference_length = length; } |
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848 int resolved_reference_length() const { return _saved._resolved_reference_length; } |
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849 void set_lock(Monitor* lock) { _lock = lock; } |
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850 Monitor* lock() { return _lock; } |
0 | 851 |
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852 // Decrease ref counts of symbols that are in the constant pool |
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853 // when the holder class is unloaded |
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854 void unreference_symbols(); |
0 | 855 |
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856 // Deallocate constant pool for RedefineClasses |
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857 void deallocate_contents(ClassLoaderData* loader_data); |
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858 void release_C_heap_structures(); |
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859 |
0 | 860 // JVMTI accesss - GetConstantPool, RetransformClasses, ... |
861 friend class JvmtiConstantPoolReconstituter; | |
862 | |
863 private: | |
864 jint cpool_entry_size(jint idx); | |
865 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap); | |
866 | |
867 // Copy cpool bytes into byte array. | |
868 // Returns: | |
869 // int > 0, count of the raw cpool bytes that have been copied | |
870 // 0, OutOfMemory error | |
871 // -1, Internal error | |
872 int copy_cpool_bytes(int cpool_size, | |
873 SymbolHashMap* tbl, | |
874 unsigned char *bytes); | |
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875 |
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876 public: |
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877 // Verify |
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878 void verify_on(outputStream* st); |
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879 |
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880 // Printing |
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881 void print_on(outputStream* st) const; |
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882 void print_value_on(outputStream* st) const; |
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883 void print_entry_on(int index, outputStream* st); |
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884 |
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885 const char* internal_name() const { return "{constant pool}"; } |
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886 |
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887 #ifndef PRODUCT |
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888 // Compile the world support |
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889 static void preload_and_initialize_all_classes(ConstantPool* constant_pool, TRAPS); |
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890 #endif |
0 | 891 }; |
892 | |
6197 | 893 class SymbolHashMapEntry : public CHeapObj<mtSymbol> { |
0 | 894 private: |
895 unsigned int _hash; // 32-bit hash for item | |
896 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket | |
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897 Symbol* _symbol; // 1-st part of the mapping: symbol => value |
0 | 898 u2 _value; // 2-nd part of the mapping: symbol => value |
899 | |
900 public: | |
901 unsigned int hash() const { return _hash; } | |
902 void set_hash(unsigned int hash) { _hash = hash; } | |
903 | |
904 SymbolHashMapEntry* next() const { return _next; } | |
905 void set_next(SymbolHashMapEntry* next) { _next = next; } | |
906 | |
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907 Symbol* symbol() const { return _symbol; } |
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908 void set_symbol(Symbol* sym) { _symbol = sym; } |
0 | 909 |
910 u2 value() const { return _value; } | |
911 void set_value(u2 value) { _value = value; } | |
912 | |
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913 SymbolHashMapEntry(unsigned int hash, Symbol* symbol, u2 value) |
0 | 914 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {} |
915 | |
916 }; // End SymbolHashMapEntry class | |
917 | |
918 | |
6197 | 919 class SymbolHashMapBucket : public CHeapObj<mtSymbol> { |
0 | 920 |
921 private: | |
922 SymbolHashMapEntry* _entry; | |
923 | |
924 public: | |
925 SymbolHashMapEntry* entry() const { return _entry; } | |
926 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; } | |
927 void clear() { _entry = NULL; } | |
928 | |
929 }; // End SymbolHashMapBucket class | |
930 | |
931 | |
6197 | 932 class SymbolHashMap: public CHeapObj<mtSymbol> { |
0 | 933 |
934 private: | |
935 // Default number of entries in the table | |
936 enum SymbolHashMap_Constants { | |
937 _Def_HashMap_Size = 256 | |
938 }; | |
939 | |
940 int _table_size; | |
941 SymbolHashMapBucket* _buckets; | |
942 | |
943 void initialize_table(int table_size) { | |
944 _table_size = table_size; | |
6197 | 945 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol); |
0 | 946 for (int index = 0; index < table_size; index++) { |
947 _buckets[index].clear(); | |
948 } | |
949 } | |
950 | |
951 public: | |
952 | |
953 int table_size() const { return _table_size; } | |
954 | |
955 SymbolHashMap() { initialize_table(_Def_HashMap_Size); } | |
956 SymbolHashMap(int table_size) { initialize_table(table_size); } | |
957 | |
958 // hash P(31) from Kernighan & Ritchie | |
959 static unsigned int compute_hash(const char* str, int len) { | |
960 unsigned int hash = 0; | |
961 while (len-- > 0) { | |
962 hash = 31*hash + (unsigned) *str; | |
963 str++; | |
964 } | |
965 return hash; | |
966 } | |
967 | |
968 SymbolHashMapEntry* bucket(int i) { | |
969 return _buckets[i].entry(); | |
970 } | |
971 | |
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972 void add_entry(Symbol* sym, u2 value); |
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973 SymbolHashMapEntry* find_entry(Symbol* sym); |
0 | 974 |
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975 u2 symbol_to_value(Symbol* sym) { |
0 | 976 SymbolHashMapEntry *entry = find_entry(sym); |
977 return (entry == NULL) ? 0 : entry->value(); | |
978 } | |
979 | |
980 ~SymbolHashMap() { | |
981 SymbolHashMapEntry* next; | |
982 for (int i = 0; i < _table_size; i++) { | |
983 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) { | |
984 next = cur->next(); | |
985 delete(cur); | |
986 } | |
987 } | |
988 delete _buckets; | |
989 } | |
990 }; // End SymbolHashMap class | |
1972 | 991 |
992 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP |