Mercurial > hg > truffle
annotate src/share/vm/oops/constantPoolOop.hpp @ 2904:1916da1d3e11
Merge.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 08 Jun 2011 17:26:49 +0200 |
parents | ed69575596ac |
children | 81d815b05abb |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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" | |
29 #include "oops/cpCacheOop.hpp" | |
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30 #include "oops/symbol.hpp" |
1972 | 31 #include "oops/typeArrayOop.hpp" |
32 #include "utilities/constantTag.hpp" | |
33 #ifdef TARGET_ARCH_x86 | |
34 # include "bytes_x86.hpp" | |
35 #endif | |
36 #ifdef TARGET_ARCH_sparc | |
37 # include "bytes_sparc.hpp" | |
38 #endif | |
39 #ifdef TARGET_ARCH_zero | |
40 # include "bytes_zero.hpp" | |
41 #endif | |
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42 #ifdef TARGET_ARCH_arm |
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43 # include "bytes_arm.hpp" |
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44 #endif |
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45 #ifdef TARGET_ARCH_ppc |
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46 # include "bytes_ppc.hpp" |
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47 #endif |
1972 | 48 |
0 | 49 // A constantPool is an array containing class constants as described in the |
50 // class file. | |
51 // | |
52 // Most of the constant pool entries are written during class parsing, which | |
53 // is safe. For klass and string types, the constant pool entry is | |
54 // modified when the entry is resolved. If a klass or string constant pool | |
55 // entry is read without a lock, only the resolved state guarantees that | |
56 // the entry in the constant pool is a klass or String object and | |
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57 // not a Symbol*. |
0 | 58 |
59 class SymbolHashMap; | |
60 | |
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61 class CPSlot VALUE_OBJ_CLASS_SPEC { |
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62 intptr_t _ptr; |
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63 public: |
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64 CPSlot(intptr_t ptr): _ptr(ptr) {} |
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65 CPSlot(void* ptr): _ptr((intptr_t)ptr) {} |
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66 CPSlot(oop 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_oop() { return (_ptr & 1) == 0; } |
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71 bool is_metadata() { return (_ptr & 1) == 1; } |
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72 |
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73 oop get_oop() { |
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74 assert(is_oop(), "bad call"); |
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75 return oop(_ptr); |
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76 } |
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77 Symbol* get_symbol() { |
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78 assert(is_metadata(), "bad call"); |
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79 return (Symbol*)(_ptr & ~1); |
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80 } |
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81 }; |
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82 |
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83 class constantPoolOopDesc : public oopDesc { |
0 | 84 friend class VMStructs; |
85 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast | |
86 private: | |
87 typeArrayOop _tags; // the tag array describing the constant pool's contents | |
88 constantPoolCacheOop _cache; // the cache holding interpreter runtime information | |
89 klassOop _pool_holder; // the corresponding class | |
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90 typeArrayOop _operands; // for variable-sized (InvokeDynamic) nodes, usually empty |
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91 int _flags; // a few header bits to describe contents for GC |
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92 int _length; // number of elements in the array |
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93 volatile bool _is_conc_safe; // if true, safe for concurrent |
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94 // GC processing |
0 | 95 // only set to non-zero if constant pool is merged by RedefineClasses |
96 int _orig_length; | |
97 | |
98 void set_tags(typeArrayOop tags) { oop_store_without_check((oop*)&_tags, tags); } | |
99 void tag_at_put(int which, jbyte t) { tags()->byte_at_put(which, t); } | |
100 void release_tag_at_put(int which, jbyte t) { tags()->release_byte_at_put(which, t); } | |
101 | |
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102 void set_operands(typeArrayOop operands) { oop_store_without_check((oop*)&_operands, operands); } |
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103 |
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104 enum FlagBit { |
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105 FB_has_invokedynamic = 1, |
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106 FB_has_pseudo_string = 2 |
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107 }; |
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108 |
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109 int flags() const { return _flags; } |
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110 void set_flags(int f) { _flags = f; } |
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111 bool flag_at(FlagBit fb) const { return (_flags & (1 << (int)fb)) != 0; } |
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112 void set_flag_at(FlagBit fb); |
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113 // no clear_flag_at function; they only increase |
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114 |
0 | 115 private: |
116 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(constantPoolOopDesc)); } | |
117 oop* tags_addr() { return (oop*)&_tags; } | |
118 oop* cache_addr() { return (oop*)&_cache; } | |
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119 oop* operands_addr() { return (oop*)&_operands; } |
0 | 120 |
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121 CPSlot slot_at(int which) { |
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122 assert(is_within_bounds(which), "index out of bounds"); |
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123 // There's a transitional value of zero when converting from |
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124 // Symbol->0->Klass for G1 when resolving classes and strings. |
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125 // wait for the value to be non-zero (this is temporary) |
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126 volatile intptr_t adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which)); |
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127 if (adr == 0 && which != 0) { |
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128 constantTag t = tag_at(which); |
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129 if (t.is_unresolved_klass() || t.is_klass() || |
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130 t.is_unresolved_string() || t.is_string()) { |
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131 while ((adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))) == 0); |
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132 } |
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133 } |
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134 return CPSlot(adr); |
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135 } |
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136 |
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137 void slot_at_put(int which, CPSlot s) const { |
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138 assert(is_within_bounds(which), "index out of bounds"); |
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139 *(intptr_t*)&base()[which] = s.value(); |
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140 } |
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141 oop* obj_at_addr_raw(int which) const { |
0 | 142 assert(is_within_bounds(which), "index out of bounds"); |
143 return (oop*) &base()[which]; | |
144 } | |
145 | |
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146 void obj_at_put_without_check(int which, oop o) { |
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147 assert(is_within_bounds(which), "index out of bounds"); |
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148 oop_store_without_check((volatile oop *)obj_at_addr_raw(which), o); |
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149 } |
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150 |
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151 void obj_at_put(int which, oop o) const { |
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152 assert(is_within_bounds(which), "index out of bounds"); |
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153 oop_store((volatile oop*)obj_at_addr_raw(which), o); |
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154 } |
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155 |
0 | 156 jint* int_at_addr(int which) const { |
157 assert(is_within_bounds(which), "index out of bounds"); | |
158 return (jint*) &base()[which]; | |
159 } | |
160 | |
161 jlong* long_at_addr(int which) const { | |
162 assert(is_within_bounds(which), "index out of bounds"); | |
163 return (jlong*) &base()[which]; | |
164 } | |
165 | |
166 jfloat* float_at_addr(int which) const { | |
167 assert(is_within_bounds(which), "index out of bounds"); | |
168 return (jfloat*) &base()[which]; | |
169 } | |
170 | |
171 jdouble* double_at_addr(int which) const { | |
172 assert(is_within_bounds(which), "index out of bounds"); | |
173 return (jdouble*) &base()[which]; | |
174 } | |
175 | |
176 public: | |
177 typeArrayOop tags() const { return _tags; } | |
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178 typeArrayOop operands() const { return _operands; } |
0 | 179 |
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180 bool has_pseudo_string() const { return flag_at(FB_has_pseudo_string); } |
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181 bool has_invokedynamic() const { return flag_at(FB_has_invokedynamic); } |
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182 void set_pseudo_string() { set_flag_at(FB_has_pseudo_string); } |
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183 void set_invokedynamic() { set_flag_at(FB_has_invokedynamic); } |
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184 |
0 | 185 // Klass holding pool |
186 klassOop pool_holder() const { return _pool_holder; } | |
187 void set_pool_holder(klassOop k) { oop_store_without_check((oop*)&_pool_holder, (oop) k); } | |
188 oop* pool_holder_addr() { return (oop*)&_pool_holder; } | |
189 | |
190 // Interpreter runtime support | |
191 constantPoolCacheOop cache() const { return _cache; } | |
192 void set_cache(constantPoolCacheOop cache){ oop_store((oop*)&_cache, cache); } | |
193 | |
194 // Assembly code support | |
195 static int tags_offset_in_bytes() { return offset_of(constantPoolOopDesc, _tags); } | |
196 static int cache_offset_in_bytes() { return offset_of(constantPoolOopDesc, _cache); } | |
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197 static int operands_offset_in_bytes() { return offset_of(constantPoolOopDesc, _operands); } |
0 | 198 static int pool_holder_offset_in_bytes() { return offset_of(constantPoolOopDesc, _pool_holder); } |
199 | |
200 // Storing constants | |
201 | |
202 void klass_at_put(int which, klassOop k) { | |
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203 // Overwrite the old index with a GC friendly value so |
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204 // that if G1 looks during the transition during oop_store it won't |
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205 // assert the symbol is not an oop. |
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206 *obj_at_addr_raw(which) = NULL; |
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207 assert(k != NULL, "resolved class shouldn't be null"); |
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208 obj_at_put_without_check(which, k); |
0 | 209 // The interpreter assumes when the tag is stored, the klass is resolved |
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210 // and the klassOop is a klass rather than a Symbol*, so we need |
0 | 211 // hardware store ordering here. |
212 release_tag_at_put(which, JVM_CONSTANT_Class); | |
213 if (UseConcMarkSweepGC) { | |
214 // In case the earlier card-mark was consumed by a concurrent | |
215 // marking thread before the tag was updated, redirty the card. | |
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216 obj_at_put_without_check(which, k); |
0 | 217 } |
218 } | |
219 | |
220 // For temporary use while constructing constant pool | |
221 void klass_index_at_put(int which, int name_index) { | |
222 tag_at_put(which, JVM_CONSTANT_ClassIndex); | |
223 *int_at_addr(which) = name_index; | |
224 } | |
225 | |
226 // Temporary until actual use | |
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227 void unresolved_klass_at_put(int which, Symbol* s) { |
0 | 228 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass); |
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229 slot_at_put(which, s); |
0 | 230 } |
231 | |
1602 | 232 void method_handle_index_at_put(int which, int ref_kind, int ref_index) { |
233 tag_at_put(which, JVM_CONSTANT_MethodHandle); | |
234 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind; | |
235 } | |
236 | |
237 void method_type_index_at_put(int which, int ref_index) { | |
238 tag_at_put(which, JVM_CONSTANT_MethodType); | |
239 *int_at_addr(which) = ref_index; | |
240 } | |
241 | |
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242 void invoke_dynamic_at_put(int which, int bootstrap_specifier_index, int name_and_type_index) { |
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243 tag_at_put(which, JVM_CONSTANT_InvokeDynamic); |
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244 *int_at_addr(which) = ((jint) name_and_type_index<<16) | bootstrap_specifier_index; |
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245 } |
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246 |
0 | 247 // Temporary until actual use |
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248 void unresolved_string_at_put(int which, Symbol* s) { |
0 | 249 release_tag_at_put(which, JVM_CONSTANT_UnresolvedString); |
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250 slot_at_put(which, s); |
0 | 251 } |
252 | |
253 void int_at_put(int which, jint i) { | |
254 tag_at_put(which, JVM_CONSTANT_Integer); | |
255 *int_at_addr(which) = i; | |
256 } | |
257 | |
258 void long_at_put(int which, jlong l) { | |
259 tag_at_put(which, JVM_CONSTANT_Long); | |
260 // *long_at_addr(which) = l; | |
261 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l)); | |
262 } | |
263 | |
264 void float_at_put(int which, jfloat f) { | |
265 tag_at_put(which, JVM_CONSTANT_Float); | |
266 *float_at_addr(which) = f; | |
267 } | |
268 | |
269 void double_at_put(int which, jdouble d) { | |
270 tag_at_put(which, JVM_CONSTANT_Double); | |
271 // *double_at_addr(which) = d; | |
272 // u8 temp = *(u8*) &d; | |
273 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d)); | |
274 } | |
275 | |
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276 Symbol** symbol_at_addr(int which) const { |
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277 assert(is_within_bounds(which), "index out of bounds"); |
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278 return (Symbol**) &base()[which]; |
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279 } |
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280 |
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281 void symbol_at_put(int which, Symbol* s) { |
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282 assert(s->refcount() != 0, "should have nonzero refcount"); |
0 | 283 tag_at_put(which, JVM_CONSTANT_Utf8); |
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284 slot_at_put(which, s); |
0 | 285 } |
286 | |
287 void string_at_put(int which, oop str) { | |
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288 // Overwrite the old index with a GC friendly value so |
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289 // that if G1 looks during the transition during oop_store it won't |
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290 // assert the symbol is not an oop. |
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291 *obj_at_addr_raw(which) = NULL; |
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292 assert(str != NULL, "resolved string shouldn't be null"); |
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293 obj_at_put(which, str); |
0 | 294 release_tag_at_put(which, JVM_CONSTANT_String); |
295 if (UseConcMarkSweepGC) { | |
296 // In case the earlier card-mark was consumed by a concurrent | |
297 // marking thread before the tag was updated, redirty the card. | |
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298 obj_at_put_without_check(which, str); |
0 | 299 } |
300 } | |
301 | |
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302 void object_at_put(int which, oop str) { |
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303 obj_at_put(which, str); |
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304 release_tag_at_put(which, JVM_CONSTANT_Object); |
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305 if (UseConcMarkSweepGC) { |
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306 // In case the earlier card-mark was consumed by a concurrent |
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307 // marking thread before the tag was updated, redirty the card. |
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308 obj_at_put_without_check(which, str); |
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309 } |
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310 } |
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311 |
0 | 312 // For temporary use while constructing constant pool |
313 void string_index_at_put(int which, int string_index) { | |
314 tag_at_put(which, JVM_CONSTANT_StringIndex); | |
315 *int_at_addr(which) = string_index; | |
316 } | |
317 | |
318 void field_at_put(int which, int class_index, int name_and_type_index) { | |
319 tag_at_put(which, JVM_CONSTANT_Fieldref); | |
320 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
321 } | |
322 | |
323 void method_at_put(int which, int class_index, int name_and_type_index) { | |
324 tag_at_put(which, JVM_CONSTANT_Methodref); | |
325 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
326 } | |
327 | |
328 void interface_method_at_put(int which, int class_index, int name_and_type_index) { | |
329 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref); | |
330 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice | |
331 } | |
332 | |
333 void name_and_type_at_put(int which, int name_index, int signature_index) { | |
334 tag_at_put(which, JVM_CONSTANT_NameAndType); | |
335 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice | |
336 } | |
337 | |
338 // Tag query | |
339 | |
340 constantTag tag_at(int which) const { return (constantTag)tags()->byte_at_acquire(which); } | |
341 | |
342 // Whether the entry is a pointer that must be GC'd. | |
343 bool is_pointer_entry(int which) { | |
344 constantTag tag = tag_at(which); | |
345 return tag.is_klass() || | |
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346 tag.is_string() || |
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347 tag.is_object(); |
0 | 348 } |
349 | |
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350 // Whether the entry points to an object for ldc (resolved or not) |
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351 bool is_object_entry(int which) { |
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352 constantTag tag = tag_at(which); |
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353 return is_pointer_entry(which) || |
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354 tag.is_unresolved_klass() || |
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355 tag.is_unresolved_string() || |
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356 tag.is_symbol(); |
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357 } |
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358 |
0 | 359 // Fetching constants |
360 | |
361 klassOop klass_at(int which, TRAPS) { | |
362 constantPoolHandle h_this(THREAD, this); | |
363 return klass_at_impl(h_this, which, CHECK_NULL); | |
364 } | |
365 | |
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366 Symbol* klass_name_at(int which); // Returns the name, w/o resolving. |
0 | 367 |
368 klassOop resolved_klass_at(int which) { // Used by Compiler | |
369 guarantee(tag_at(which).is_klass(), "Corrupted constant pool"); | |
370 // Must do an acquire here in case another thread resolved the klass | |
371 // behind our back, lest we later load stale values thru the oop. | |
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372 return klassOop(CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_oop()); |
0 | 373 } |
374 | |
375 // This method should only be used with a cpool lock or during parsing or gc | |
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376 Symbol* unresolved_klass_at(int which) { // Temporary until actual use |
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377 Symbol* s = CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol(); |
0 | 378 // check that the klass is still unresolved. |
379 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool"); | |
380 return s; | |
381 } | |
382 | |
383 // RedefineClasses() API support: | |
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384 Symbol* klass_at_noresolve(int which) { return klass_name_at(which); } |
0 | 385 |
386 jint int_at(int which) { | |
387 assert(tag_at(which).is_int(), "Corrupted constant pool"); | |
388 return *int_at_addr(which); | |
389 } | |
390 | |
391 jlong long_at(int which) { | |
392 assert(tag_at(which).is_long(), "Corrupted constant pool"); | |
393 // return *long_at_addr(which); | |
394 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
395 return *((jlong*)&tmp); | |
396 } | |
397 | |
398 jfloat float_at(int which) { | |
399 assert(tag_at(which).is_float(), "Corrupted constant pool"); | |
400 return *float_at_addr(which); | |
401 } | |
402 | |
403 jdouble double_at(int which) { | |
404 assert(tag_at(which).is_double(), "Corrupted constant pool"); | |
405 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
406 return *((jdouble*)&tmp); | |
407 } | |
408 | |
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409 Symbol* symbol_at(int which) { |
0 | 410 assert(tag_at(which).is_utf8(), "Corrupted constant pool"); |
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411 return slot_at(which).get_symbol(); |
0 | 412 } |
413 | |
414 oop string_at(int which, TRAPS) { | |
415 constantPoolHandle h_this(THREAD, this); | |
416 return string_at_impl(h_this, which, CHECK_NULL); | |
417 } | |
418 | |
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419 oop object_at(int which) { |
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420 assert(tag_at(which).is_object(), "Corrupted constant pool"); |
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421 return slot_at(which).get_oop(); |
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422 } |
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423 |
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424 // A "pseudo-string" is an non-string oop that has found is way into |
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425 // a String entry. |
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426 // Under EnableInvokeDynamic this can happen if the user patches a live |
431
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427 // object into a CONSTANT_String entry of an anonymous class. |
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428 // Method oops internally created for method handles may also |
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429 // use pseudo-strings to link themselves to related metaobjects. |
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430 |
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431 bool is_pseudo_string_at(int which); |
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432 |
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433 oop pseudo_string_at(int which) { |
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434 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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435 return slot_at(which).get_oop(); |
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436 } |
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437 |
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438 void pseudo_string_at_put(int which, oop x) { |
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439 assert(EnableInvokeDynamic, ""); |
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440 set_pseudo_string(); // mark header |
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441 assert(tag_at(which).is_string() || tag_at(which).is_unresolved_string(), "Corrupted constant pool"); |
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442 string_at_put(which, x); // this works just fine |
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443 } |
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444 |
0 | 445 // only called when we are sure a string entry is already resolved (via an |
446 // earlier string_at call. | |
447 oop resolved_string_at(int which) { | |
448 assert(tag_at(which).is_string(), "Corrupted constant pool"); | |
449 // Must do an acquire here in case another thread resolved the klass | |
450 // behind our back, lest we later load stale values thru the oop. | |
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451 return CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_oop(); |
0 | 452 } |
453 | |
454 // This method should only be used with a cpool lock or during parsing or gc | |
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455 Symbol* unresolved_string_at(int which) { // Temporary until actual use |
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456 Symbol* s = CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol(); |
0 | 457 // check that the string is still unresolved. |
458 assert(tag_at(which).is_unresolved_string(), "Corrupted constant pool"); | |
459 return s; | |
460 } | |
461 | |
462 // Returns an UTF8 for a CONSTANT_String entry at a given index. | |
463 // UTF8 char* representation was chosen to avoid conversion of | |
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464 // java_lang_Strings at resolved entries into Symbol*s |
0 | 465 // or vice versa. |
431
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466 // Caller is responsible for checking for pseudo-strings. |
0 | 467 char* string_at_noresolve(int which); |
468 | |
469 jint name_and_type_at(int which) { | |
470 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool"); | |
471 return *int_at_addr(which); | |
472 } | |
473 | |
1602 | 474 int method_handle_ref_kind_at(int which) { |
475 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
476 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits | |
477 } | |
478 int method_handle_index_at(int which) { | |
479 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
480 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits | |
481 } | |
482 int method_type_index_at(int which) { | |
483 assert(tag_at(which).is_method_type(), "Corrupted constant pool"); | |
484 return *int_at_addr(which); | |
485 } | |
486 // Derived queries: | |
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487 Symbol* method_handle_name_ref_at(int which) { |
1602 | 488 int member = method_handle_index_at(which); |
489 return impl_name_ref_at(member, true); | |
490 } | |
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491 Symbol* method_handle_signature_ref_at(int which) { |
1602 | 492 int member = method_handle_index_at(which); |
493 return impl_signature_ref_at(member, true); | |
494 } | |
495 int method_handle_klass_index_at(int which) { | |
496 int member = method_handle_index_at(which); | |
497 return impl_klass_ref_index_at(member, true); | |
498 } | |
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499 Symbol* method_type_signature_at(int which) { |
1602 | 500 int sym = method_type_index_at(which); |
501 return symbol_at(sym); | |
502 } | |
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503 |
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504 int invoke_dynamic_name_and_type_ref_index_at(int which) { |
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505 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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506 return extract_high_short_from_int(*int_at_addr(which)); |
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507 } |
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508 int invoke_dynamic_bootstrap_specifier_index(int which) { |
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509 assert(tag_at(which).value() == JVM_CONSTANT_InvokeDynamic, "Corrupted constant pool"); |
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510 return extract_low_short_from_int(*int_at_addr(which)); |
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511 } |
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512 int invoke_dynamic_operand_base(int which) { |
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513 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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514 return operand_offset_at(operands(), bootstrap_specifier_index); |
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515 } |
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516 // The first part of the operands array consists of an index into the second part. |
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517 // Extract a 32-bit index value from the first part. |
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518 static int operand_offset_at(typeArrayOop operands, int bootstrap_specifier_index) { |
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519 int n = (bootstrap_specifier_index * 2); |
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520 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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521 // The first 32-bit index points to the beginning of the second part |
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522 // of the operands array. Make sure this index is in the first part. |
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523 DEBUG_ONLY(int second_part = build_int_from_shorts(operands->short_at(0), |
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524 operands->short_at(1))); |
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525 assert(second_part == 0 || n+2 <= second_part, "oob (2)"); |
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526 int offset = build_int_from_shorts(operands->short_at(n+0), |
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527 operands->short_at(n+1)); |
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528 // The offset itself must point into the second part of the array. |
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529 assert(offset == 0 || offset >= second_part && offset <= operands->length(), "oob (3)"); |
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530 return offset; |
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531 } |
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532 static void operand_offset_at_put(typeArrayOop operands, int bootstrap_specifier_index, int offset) { |
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533 int n = bootstrap_specifier_index * 2; |
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534 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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535 operands->short_at_put(n+0, extract_low_short_from_int(offset)); |
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536 operands->short_at_put(n+1, extract_high_short_from_int(offset)); |
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537 } |
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538 static int operand_array_length(typeArrayOop operands) { |
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539 if (operands == NULL || operands->length() == 0) return 0; |
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540 int second_part = operand_offset_at(operands, 0); |
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541 return (second_part / 2); |
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542 } |
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543 |
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544 #ifdef ASSERT |
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545 // operand tuples fit together exactly, end to end |
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546 static int operand_limit_at(typeArrayOop operands, int bootstrap_specifier_index) { |
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547 int nextidx = bootstrap_specifier_index + 1; |
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548 if (nextidx == operand_array_length(operands)) |
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549 return operands->length(); |
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550 else |
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551 return operand_offset_at(operands, nextidx); |
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552 } |
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553 int invoke_dynamic_operand_limit(int which) { |
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554 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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555 return operand_limit_at(operands(), bootstrap_specifier_index); |
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556 } |
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557 #endif //ASSERT |
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558 |
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559 // layout of InvokeDynamic bootstrap method specifier (in second part of operands array): |
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560 enum { |
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561 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm |
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562 _indy_argc_offset = 1, // u2 argc |
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563 _indy_argv_offset = 2 // u2 argv[argc] |
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564 }; |
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565 int invoke_dynamic_bootstrap_method_ref_index_at(int which) { |
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566 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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567 int op_base = invoke_dynamic_operand_base(which); |
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568 return operands()->short_at(op_base + _indy_bsm_offset); |
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569 } |
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570 int invoke_dynamic_argument_count_at(int which) { |
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571 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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572 int op_base = invoke_dynamic_operand_base(which); |
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573 int argc = operands()->short_at(op_base + _indy_argc_offset); |
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574 DEBUG_ONLY(int end_offset = op_base + _indy_argv_offset + argc; |
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575 int next_offset = invoke_dynamic_operand_limit(which)); |
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576 assert(end_offset == next_offset, "matched ending"); |
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577 return argc; |
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578 } |
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579 int invoke_dynamic_argument_index_at(int which, int j) { |
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580 int op_base = invoke_dynamic_operand_base(which); |
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581 DEBUG_ONLY(int argc = operands()->short_at(op_base + _indy_argc_offset)); |
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582 assert((uint)j < (uint)argc, "oob"); |
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583 return operands()->short_at(op_base + _indy_argv_offset + j); |
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584 } |
1602 | 585 |
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586 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve, |
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587 // name_and_type_ref_index_at) all expect to be passed indices obtained |
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588 // directly from the bytecode. |
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589 // If the indices are meant to refer to fields or methods, they are |
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590 // actually rewritten constant pool cache indices. |
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591 // The routine remap_instruction_operand_from_cache manages the adjustment |
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592 // of these values back to constant pool indices. |
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593 |
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594 // There are also "uncached" versions which do not adjust the operand index; see below. |
0 | 595 |
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596 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear. |
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597 // In a few cases (the verifier) there are uses before a cpcache has been built, |
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598 // which are handled by a dynamic check in remap_instruction_operand_from_cache. |
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599 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode. |
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600 |
0 | 601 // Lookup for entries consisting of (klass_index, name_and_type index) |
602 klassOop klass_ref_at(int which, TRAPS); | |
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603 Symbol* klass_ref_at_noresolve(int which); |
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604 Symbol* name_ref_at(int which) { return impl_name_ref_at(which, false); } |
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605 Symbol* signature_ref_at(int which) { return impl_signature_ref_at(which, false); } |
0 | 606 |
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607 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); } |
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608 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); } |
0 | 609 |
610 // Lookup for entries consisting of (name_index, signature_index) | |
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611 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt) |
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612 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt) |
0 | 613 |
614 BasicType basic_type_for_signature_at(int which); | |
615 | |
616 // Resolve string constants (to prevent allocation during compilation) | |
617 void resolve_string_constants(TRAPS) { | |
618 constantPoolHandle h_this(THREAD, this); | |
619 resolve_string_constants_impl(h_this, CHECK); | |
620 } | |
621 | |
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622 private: |
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623 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 }; |
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624 public: |
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625 |
1602 | 626 // Resolve late bound constants. |
627 oop resolve_constant_at(int index, TRAPS) { | |
628 constantPoolHandle h_this(THREAD, this); | |
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629 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD); |
1602 | 630 } |
631 | |
632 oop resolve_cached_constant_at(int cache_index, TRAPS) { | |
633 constantPoolHandle h_this(THREAD, this); | |
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634 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD); |
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635 } |
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636 |
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637 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) { |
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638 constantPoolHandle h_this(THREAD, this); |
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639 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD); |
1602 | 640 } |
641 | |
0 | 642 // Klass name matches name at offset |
643 bool klass_name_at_matches(instanceKlassHandle k, int which); | |
644 | |
645 // Sizing | |
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646 int length() const { return _length; } |
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647 void set_length(int length) { _length = length; } |
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648 |
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649 // Tells whether index is within bounds. |
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650 bool is_within_bounds(int index) const { |
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651 return 0 <= index && index < length(); |
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652 } |
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653 |
0 | 654 static int header_size() { return sizeof(constantPoolOopDesc)/HeapWordSize; } |
655 static int object_size(int length) { return align_object_size(header_size() + length); } | |
656 int object_size() { return object_size(length()); } | |
657 | |
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658 bool is_conc_safe() { return _is_conc_safe; } |
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659 void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
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660 |
0 | 661 friend class constantPoolKlass; |
662 friend class ClassFileParser; | |
663 friend class SystemDictionary; | |
664 | |
665 // Used by compiler to prevent classloading. | |
666 static klassOop klass_at_if_loaded (constantPoolHandle this_oop, int which); | |
667 static klassOop klass_ref_at_if_loaded (constantPoolHandle this_oop, int which); | |
668 // Same as above - but does LinkResolving. | |
669 static klassOop klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int which, TRAPS); | |
670 | |
671 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the | |
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672 // future by other Java code. These take constant pool indices rather than |
0 | 673 // constant pool cache indices as do the peer methods above. |
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674 Symbol* uncached_klass_ref_at_noresolve(int which); |
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675 Symbol* uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); } |
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676 Symbol* uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); } |
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677 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); } |
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678 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); } |
0 | 679 |
680 // Sharing | |
681 int pre_resolve_shared_klasses(TRAPS); | |
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682 void shared_symbols_iterate(SymbolClosure* closure0); |
0 | 683 void shared_tags_iterate(OopClosure* closure0); |
684 void shared_strings_iterate(OopClosure* closure0); | |
685 | |
686 // Debugging | |
687 const char* printable_name_at(int which) PRODUCT_RETURN0; | |
688 | |
1565 | 689 #ifdef ASSERT |
690 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices | |
1602 | 691 #else |
692 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op | |
1565 | 693 #endif //ASSERT |
694 | |
0 | 695 private: |
696 | |
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697 Symbol* impl_name_ref_at(int which, bool uncached); |
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698 Symbol* impl_signature_ref_at(int which, bool uncached); |
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699 int impl_klass_ref_index_at(int which, bool uncached); |
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700 int impl_name_and_type_ref_index_at(int which, bool uncached); |
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701 |
1565 | 702 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG |
0 | 703 |
704 // Used while constructing constant pool (only by ClassFileParser) | |
705 jint klass_index_at(int which) { | |
706 assert(tag_at(which).is_klass_index(), "Corrupted constant pool"); | |
707 return *int_at_addr(which); | |
708 } | |
709 | |
710 jint string_index_at(int which) { | |
711 assert(tag_at(which).is_string_index(), "Corrupted constant pool"); | |
712 return *int_at_addr(which); | |
713 } | |
714 | |
715 // Performs the LinkResolver checks | |
716 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS); | |
717 | |
718 // Implementation of methods that needs an exposed 'this' pointer, in order to | |
719 // handle GC while executing the method | |
720 static klassOop klass_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
721 static oop string_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
722 | |
723 // Resolve string constants (to prevent allocation during compilation) | |
724 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS); | |
725 | |
1602 | 726 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS); |
727 | |
0 | 728 public: |
729 // Merging constantPoolOop support: | |
730 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS); | |
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731 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS) { |
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732 constantPoolHandle h_this(THREAD, this); |
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733 copy_cp_to_impl(h_this, start_i, end_i, to_cp, to_i, THREAD); |
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734 } |
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735 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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736 static void copy_entry_to(constantPoolHandle from_cp, int from_i, constantPoolHandle to_cp, int to_i, TRAPS); |
0 | 737 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS); |
738 int orig_length() const { return _orig_length; } | |
739 void set_orig_length(int orig_length) { _orig_length = orig_length; } | |
740 | |
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741 // Decrease ref counts of symbols that are in the constant pool |
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742 // when the holder class is unloaded |
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743 void unreference_symbols(); |
0 | 744 |
745 // JVMTI accesss - GetConstantPool, RetransformClasses, ... | |
746 friend class JvmtiConstantPoolReconstituter; | |
747 | |
748 private: | |
749 jint cpool_entry_size(jint idx); | |
750 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap); | |
751 | |
752 // Copy cpool bytes into byte array. | |
753 // Returns: | |
754 // int > 0, count of the raw cpool bytes that have been copied | |
755 // 0, OutOfMemory error | |
756 // -1, Internal error | |
757 int copy_cpool_bytes(int cpool_size, | |
758 SymbolHashMap* tbl, | |
759 unsigned char *bytes); | |
760 }; | |
761 | |
762 class SymbolHashMapEntry : public CHeapObj { | |
763 private: | |
764 unsigned int _hash; // 32-bit hash for item | |
765 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket | |
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766 Symbol* _symbol; // 1-st part of the mapping: symbol => value |
0 | 767 u2 _value; // 2-nd part of the mapping: symbol => value |
768 | |
769 public: | |
770 unsigned int hash() const { return _hash; } | |
771 void set_hash(unsigned int hash) { _hash = hash; } | |
772 | |
773 SymbolHashMapEntry* next() const { return _next; } | |
774 void set_next(SymbolHashMapEntry* next) { _next = next; } | |
775 | |
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776 Symbol* symbol() const { return _symbol; } |
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777 void set_symbol(Symbol* sym) { _symbol = sym; } |
0 | 778 |
779 u2 value() const { return _value; } | |
780 void set_value(u2 value) { _value = value; } | |
781 | |
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782 SymbolHashMapEntry(unsigned int hash, Symbol* symbol, u2 value) |
0 | 783 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {} |
784 | |
785 }; // End SymbolHashMapEntry class | |
786 | |
787 | |
788 class SymbolHashMapBucket : public CHeapObj { | |
789 | |
790 private: | |
791 SymbolHashMapEntry* _entry; | |
792 | |
793 public: | |
794 SymbolHashMapEntry* entry() const { return _entry; } | |
795 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; } | |
796 void clear() { _entry = NULL; } | |
797 | |
798 }; // End SymbolHashMapBucket class | |
799 | |
800 | |
801 class SymbolHashMap: public CHeapObj { | |
802 | |
803 private: | |
804 // Default number of entries in the table | |
805 enum SymbolHashMap_Constants { | |
806 _Def_HashMap_Size = 256 | |
807 }; | |
808 | |
809 int _table_size; | |
810 SymbolHashMapBucket* _buckets; | |
811 | |
812 void initialize_table(int table_size) { | |
813 _table_size = table_size; | |
814 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size); | |
815 for (int index = 0; index < table_size; index++) { | |
816 _buckets[index].clear(); | |
817 } | |
818 } | |
819 | |
820 public: | |
821 | |
822 int table_size() const { return _table_size; } | |
823 | |
824 SymbolHashMap() { initialize_table(_Def_HashMap_Size); } | |
825 SymbolHashMap(int table_size) { initialize_table(table_size); } | |
826 | |
827 // hash P(31) from Kernighan & Ritchie | |
828 static unsigned int compute_hash(const char* str, int len) { | |
829 unsigned int hash = 0; | |
830 while (len-- > 0) { | |
831 hash = 31*hash + (unsigned) *str; | |
832 str++; | |
833 } | |
834 return hash; | |
835 } | |
836 | |
837 SymbolHashMapEntry* bucket(int i) { | |
838 return _buckets[i].entry(); | |
839 } | |
840 | |
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841 void add_entry(Symbol* sym, u2 value); |
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842 SymbolHashMapEntry* find_entry(Symbol* sym); |
0 | 843 |
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844 u2 symbol_to_value(Symbol* sym) { |
0 | 845 SymbolHashMapEntry *entry = find_entry(sym); |
846 return (entry == NULL) ? 0 : entry->value(); | |
847 } | |
848 | |
849 ~SymbolHashMap() { | |
850 SymbolHashMapEntry* next; | |
851 for (int i = 0; i < _table_size; i++) { | |
852 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) { | |
853 next = cur->next(); | |
854 delete(cur); | |
855 } | |
856 } | |
857 delete _buckets; | |
858 } | |
859 }; // End SymbolHashMap class | |
1972 | 860 |
861 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP |