Mercurial > hg > truffle
annotate src/share/vm/oops/constantPoolOop.hpp @ 5274:e72dd6533eb9
documented importance of nmethod::_graal_compiled_method wrt code unloading and GC
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 23 Apr 2012 15:42:30 +0200 |
parents | 96c40b338c1a |
children | 957c266d8bc5 |
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 FB_has_preresolution = 3 |
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108 }; |
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109 |
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110 int flags() const { return _flags; } |
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111 void set_flags(int f) { _flags = f; } |
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112 bool flag_at(FlagBit fb) const { return (_flags & (1 << (int)fb)) != 0; } |
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113 void set_flag_at(FlagBit fb); |
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114 // no clear_flag_at function; they only increase |
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115 |
0 | 116 private: |
117 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(constantPoolOopDesc)); } | |
118 oop* tags_addr() { return (oop*)&_tags; } | |
119 oop* cache_addr() { return (oop*)&_cache; } | |
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120 oop* operands_addr() { return (oop*)&_operands; } |
0 | 121 |
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122 CPSlot slot_at(int which) { |
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123 assert(is_within_bounds(which), "index out of bounds"); |
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124 // There's a transitional value of zero when converting from |
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125 // Symbol->0->Klass for G1 when resolving classes and strings. |
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126 // wait for the value to be non-zero (this is temporary) |
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127 volatile intptr_t adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which)); |
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128 if (adr == 0 && which != 0) { |
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129 constantTag t = tag_at(which); |
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130 if (t.is_unresolved_klass() || t.is_klass() || |
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131 t.is_unresolved_string() || t.is_string()) { |
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132 while ((adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))) == 0); |
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133 } |
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134 } |
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135 return CPSlot(adr); |
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136 } |
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137 |
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138 void slot_at_put(int which, CPSlot s) const { |
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139 assert(is_within_bounds(which), "index out of bounds"); |
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140 *(intptr_t*)&base()[which] = s.value(); |
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141 } |
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142 oop* obj_at_addr_raw(int which) const { |
0 | 143 assert(is_within_bounds(which), "index out of bounds"); |
144 return (oop*) &base()[which]; | |
145 } | |
146 | |
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147 void obj_at_put_without_check(int which, oop o) { |
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148 assert(is_within_bounds(which), "index out of bounds"); |
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149 oop_store_without_check((volatile oop *)obj_at_addr_raw(which), o); |
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150 } |
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151 |
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152 void obj_at_put(int which, oop o) const { |
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153 assert(is_within_bounds(which), "index out of bounds"); |
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154 oop_store((volatile oop*)obj_at_addr_raw(which), o); |
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155 } |
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156 |
0 | 157 jint* int_at_addr(int which) const { |
158 assert(is_within_bounds(which), "index out of bounds"); | |
159 return (jint*) &base()[which]; | |
160 } | |
161 | |
162 jlong* long_at_addr(int which) const { | |
163 assert(is_within_bounds(which), "index out of bounds"); | |
164 return (jlong*) &base()[which]; | |
165 } | |
166 | |
167 jfloat* float_at_addr(int which) const { | |
168 assert(is_within_bounds(which), "index out of bounds"); | |
169 return (jfloat*) &base()[which]; | |
170 } | |
171 | |
172 jdouble* double_at_addr(int which) const { | |
173 assert(is_within_bounds(which), "index out of bounds"); | |
174 return (jdouble*) &base()[which]; | |
175 } | |
176 | |
177 public: | |
178 typeArrayOop tags() const { return _tags; } | |
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179 typeArrayOop operands() const { return _operands; } |
0 | 180 |
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181 bool has_pseudo_string() const { return flag_at(FB_has_pseudo_string); } |
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182 bool has_invokedynamic() const { return flag_at(FB_has_invokedynamic); } |
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183 bool has_preresolution() const { return flag_at(FB_has_preresolution); } |
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184 void set_pseudo_string() { set_flag_at(FB_has_pseudo_string); } |
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185 void set_invokedynamic() { set_flag_at(FB_has_invokedynamic); } |
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186 void set_preresolution() { set_flag_at(FB_has_preresolution); } |
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187 |
0 | 188 // Klass holding pool |
189 klassOop pool_holder() const { return _pool_holder; } | |
190 void set_pool_holder(klassOop k) { oop_store_without_check((oop*)&_pool_holder, (oop) k); } | |
191 oop* pool_holder_addr() { return (oop*)&_pool_holder; } | |
192 | |
193 // Interpreter runtime support | |
194 constantPoolCacheOop cache() const { return _cache; } | |
195 void set_cache(constantPoolCacheOop cache){ oop_store((oop*)&_cache, cache); } | |
196 | |
197 // Assembly code support | |
198 static int tags_offset_in_bytes() { return offset_of(constantPoolOopDesc, _tags); } | |
199 static int cache_offset_in_bytes() { return offset_of(constantPoolOopDesc, _cache); } | |
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200 static int operands_offset_in_bytes() { return offset_of(constantPoolOopDesc, _operands); } |
0 | 201 static int pool_holder_offset_in_bytes() { return offset_of(constantPoolOopDesc, _pool_holder); } |
202 | |
203 // Storing constants | |
204 | |
205 void klass_at_put(int which, klassOop k) { | |
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206 // Overwrite the old index with a GC friendly value so |
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207 // that if G1 looks during the transition during oop_store it won't |
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208 // assert the symbol is not an oop. |
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209 *obj_at_addr_raw(which) = NULL; |
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210 assert(k != NULL, "resolved class shouldn't be null"); |
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211 obj_at_put_without_check(which, k); |
0 | 212 // The interpreter assumes when the tag is stored, the klass is resolved |
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213 // and the klassOop is a klass rather than a Symbol*, so we need |
0 | 214 // hardware store ordering here. |
215 release_tag_at_put(which, JVM_CONSTANT_Class); | |
216 if (UseConcMarkSweepGC) { | |
217 // In case the earlier card-mark was consumed by a concurrent | |
218 // marking thread before the tag was updated, redirty the card. | |
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219 obj_at_put_without_check(which, k); |
0 | 220 } |
221 } | |
222 | |
223 // For temporary use while constructing constant pool | |
224 void klass_index_at_put(int which, int name_index) { | |
225 tag_at_put(which, JVM_CONSTANT_ClassIndex); | |
226 *int_at_addr(which) = name_index; | |
227 } | |
228 | |
229 // Temporary until actual use | |
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230 void unresolved_klass_at_put(int which, Symbol* s) { |
0 | 231 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass); |
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232 slot_at_put(which, s); |
0 | 233 } |
234 | |
1602 | 235 void method_handle_index_at_put(int which, int ref_kind, int ref_index) { |
236 tag_at_put(which, JVM_CONSTANT_MethodHandle); | |
237 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind; | |
238 } | |
239 | |
240 void method_type_index_at_put(int which, int ref_index) { | |
241 tag_at_put(which, JVM_CONSTANT_MethodType); | |
242 *int_at_addr(which) = ref_index; | |
243 } | |
244 | |
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245 void invoke_dynamic_at_put(int which, int bootstrap_specifier_index, int name_and_type_index) { |
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246 tag_at_put(which, JVM_CONSTANT_InvokeDynamic); |
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247 *int_at_addr(which) = ((jint) name_and_type_index<<16) | bootstrap_specifier_index; |
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248 } |
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249 |
0 | 250 // Temporary until actual use |
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251 void unresolved_string_at_put(int which, Symbol* s) { |
0 | 252 release_tag_at_put(which, JVM_CONSTANT_UnresolvedString); |
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253 slot_at_put(which, s); |
0 | 254 } |
255 | |
256 void int_at_put(int which, jint i) { | |
257 tag_at_put(which, JVM_CONSTANT_Integer); | |
258 *int_at_addr(which) = i; | |
259 } | |
260 | |
261 void long_at_put(int which, jlong l) { | |
262 tag_at_put(which, JVM_CONSTANT_Long); | |
263 // *long_at_addr(which) = l; | |
264 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l)); | |
265 } | |
266 | |
267 void float_at_put(int which, jfloat f) { | |
268 tag_at_put(which, JVM_CONSTANT_Float); | |
269 *float_at_addr(which) = f; | |
270 } | |
271 | |
272 void double_at_put(int which, jdouble d) { | |
273 tag_at_put(which, JVM_CONSTANT_Double); | |
274 // *double_at_addr(which) = d; | |
275 // u8 temp = *(u8*) &d; | |
276 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d)); | |
277 } | |
278 | |
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279 Symbol** symbol_at_addr(int which) const { |
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280 assert(is_within_bounds(which), "index out of bounds"); |
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281 return (Symbol**) &base()[which]; |
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282 } |
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283 |
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284 void symbol_at_put(int which, Symbol* s) { |
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285 assert(s->refcount() != 0, "should have nonzero refcount"); |
0 | 286 tag_at_put(which, JVM_CONSTANT_Utf8); |
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287 slot_at_put(which, s); |
0 | 288 } |
289 | |
290 void string_at_put(int which, oop str) { | |
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291 // Overwrite the old index with a GC friendly value so |
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292 // that if G1 looks during the transition during oop_store it won't |
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293 // assert the symbol is not an oop. |
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294 *obj_at_addr_raw(which) = NULL; |
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295 assert(str != NULL, "resolved string shouldn't be null"); |
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296 obj_at_put(which, str); |
0 | 297 release_tag_at_put(which, JVM_CONSTANT_String); |
298 if (UseConcMarkSweepGC) { | |
299 // In case the earlier card-mark was consumed by a concurrent | |
300 // marking thread before the tag was updated, redirty the card. | |
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301 obj_at_put_without_check(which, str); |
0 | 302 } |
303 } | |
304 | |
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305 void object_at_put(int which, oop str) { |
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306 obj_at_put(which, str); |
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307 release_tag_at_put(which, JVM_CONSTANT_Object); |
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308 if (UseConcMarkSweepGC) { |
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309 // In case the earlier card-mark was consumed by a concurrent |
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310 // marking thread before the tag was updated, redirty the card. |
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311 obj_at_put_without_check(which, str); |
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312 } |
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313 } |
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314 |
0 | 315 // For temporary use while constructing constant pool |
316 void string_index_at_put(int which, int string_index) { | |
317 tag_at_put(which, JVM_CONSTANT_StringIndex); | |
318 *int_at_addr(which) = string_index; | |
319 } | |
320 | |
321 void field_at_put(int which, int class_index, int name_and_type_index) { | |
322 tag_at_put(which, JVM_CONSTANT_Fieldref); | |
323 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
324 } | |
325 | |
326 void method_at_put(int which, int class_index, int name_and_type_index) { | |
327 tag_at_put(which, JVM_CONSTANT_Methodref); | |
328 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
329 } | |
330 | |
331 void interface_method_at_put(int which, int class_index, int name_and_type_index) { | |
332 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref); | |
333 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice | |
334 } | |
335 | |
336 void name_and_type_at_put(int which, int name_index, int signature_index) { | |
337 tag_at_put(which, JVM_CONSTANT_NameAndType); | |
338 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice | |
339 } | |
340 | |
341 // Tag query | |
342 | |
343 constantTag tag_at(int which) const { return (constantTag)tags()->byte_at_acquire(which); } | |
344 | |
345 // Whether the entry is a pointer that must be GC'd. | |
346 bool is_pointer_entry(int which) { | |
347 constantTag tag = tag_at(which); | |
348 return tag.is_klass() || | |
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349 tag.is_string() || |
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350 tag.is_object(); |
0 | 351 } |
352 | |
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353 // Whether the entry points to an object for ldc (resolved or not) |
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354 bool is_object_entry(int which) { |
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355 constantTag tag = tag_at(which); |
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356 return is_pointer_entry(which) || |
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357 tag.is_unresolved_klass() || |
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358 tag.is_unresolved_string() || |
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359 tag.is_symbol(); |
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360 } |
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361 |
0 | 362 // Fetching constants |
363 | |
364 klassOop klass_at(int which, TRAPS) { | |
365 constantPoolHandle h_this(THREAD, this); | |
366 return klass_at_impl(h_this, which, CHECK_NULL); | |
367 } | |
368 | |
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369 Symbol* klass_name_at(int which); // Returns the name, w/o resolving. |
0 | 370 |
371 klassOop resolved_klass_at(int which) { // Used by Compiler | |
372 guarantee(tag_at(which).is_klass(), "Corrupted constant pool"); | |
373 // Must do an acquire here in case another thread resolved the klass | |
374 // behind our back, lest we later load stale values thru the oop. | |
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375 return klassOop(CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_oop()); |
0 | 376 } |
377 | |
378 // This method should only be used with a cpool lock or during parsing or gc | |
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379 Symbol* unresolved_klass_at(int which) { // Temporary until actual use |
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380 Symbol* s = CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol(); |
0 | 381 // check that the klass is still unresolved. |
382 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool"); | |
383 return s; | |
384 } | |
385 | |
386 // RedefineClasses() API support: | |
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387 Symbol* klass_at_noresolve(int which) { return klass_name_at(which); } |
0 | 388 |
389 jint int_at(int which) { | |
390 assert(tag_at(which).is_int(), "Corrupted constant pool"); | |
391 return *int_at_addr(which); | |
392 } | |
393 | |
394 jlong long_at(int which) { | |
395 assert(tag_at(which).is_long(), "Corrupted constant pool"); | |
396 // return *long_at_addr(which); | |
397 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
398 return *((jlong*)&tmp); | |
399 } | |
400 | |
401 jfloat float_at(int which) { | |
402 assert(tag_at(which).is_float(), "Corrupted constant pool"); | |
403 return *float_at_addr(which); | |
404 } | |
405 | |
406 jdouble double_at(int which) { | |
407 assert(tag_at(which).is_double(), "Corrupted constant pool"); | |
408 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
409 return *((jdouble*)&tmp); | |
410 } | |
411 | |
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412 Symbol* symbol_at(int which) { |
0 | 413 assert(tag_at(which).is_utf8(), "Corrupted constant pool"); |
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414 return slot_at(which).get_symbol(); |
0 | 415 } |
416 | |
417 oop string_at(int which, TRAPS) { | |
418 constantPoolHandle h_this(THREAD, this); | |
419 return string_at_impl(h_this, which, CHECK_NULL); | |
420 } | |
421 | |
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422 oop object_at(int which) { |
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423 assert(tag_at(which).is_object(), "Corrupted constant pool"); |
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424 return slot_at(which).get_oop(); |
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425 } |
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426 |
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427 // A "pseudo-string" is an non-string oop that has found is way into |
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428 // a String entry. |
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429 // Under EnableInvokeDynamic this can happen if the user patches a live |
431
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430 // object into a CONSTANT_String entry of an anonymous class. |
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431 // Method oops internally created for method handles may also |
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432 // use pseudo-strings to link themselves to related metaobjects. |
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433 |
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434 bool is_pseudo_string_at(int which); |
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435 |
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436 oop pseudo_string_at(int which) { |
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437 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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438 return slot_at(which).get_oop(); |
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439 } |
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440 |
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441 void pseudo_string_at_put(int which, oop x) { |
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442 assert(EnableInvokeDynamic, ""); |
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443 set_pseudo_string(); // mark header |
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444 assert(tag_at(which).is_string() || tag_at(which).is_unresolved_string(), "Corrupted constant pool"); |
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445 string_at_put(which, x); // this works just fine |
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446 } |
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447 |
0 | 448 // only called when we are sure a string entry is already resolved (via an |
449 // earlier string_at call. | |
450 oop resolved_string_at(int which) { | |
451 assert(tag_at(which).is_string(), "Corrupted constant pool"); | |
452 // Must do an acquire here in case another thread resolved the klass | |
453 // behind our back, lest we later load stale values thru the oop. | |
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454 return CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_oop(); |
0 | 455 } |
456 | |
457 // This method should only be used with a cpool lock or during parsing or gc | |
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458 Symbol* unresolved_string_at(int which) { // Temporary until actual use |
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459 Symbol* s = CPSlot(OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol(); |
0 | 460 // check that the string is still unresolved. |
461 assert(tag_at(which).is_unresolved_string(), "Corrupted constant pool"); | |
462 return s; | |
463 } | |
464 | |
465 // Returns an UTF8 for a CONSTANT_String entry at a given index. | |
466 // UTF8 char* representation was chosen to avoid conversion of | |
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467 // java_lang_Strings at resolved entries into Symbol*s |
0 | 468 // or vice versa. |
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469 // Caller is responsible for checking for pseudo-strings. |
0 | 470 char* string_at_noresolve(int which); |
471 | |
472 jint name_and_type_at(int which) { | |
473 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool"); | |
474 return *int_at_addr(which); | |
475 } | |
476 | |
1602 | 477 int method_handle_ref_kind_at(int which) { |
478 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
479 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits | |
480 } | |
481 int method_handle_index_at(int which) { | |
482 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
483 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits | |
484 } | |
485 int method_type_index_at(int which) { | |
486 assert(tag_at(which).is_method_type(), "Corrupted constant pool"); | |
487 return *int_at_addr(which); | |
488 } | |
489 // Derived queries: | |
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490 Symbol* method_handle_name_ref_at(int which) { |
1602 | 491 int member = method_handle_index_at(which); |
492 return impl_name_ref_at(member, true); | |
493 } | |
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494 Symbol* method_handle_signature_ref_at(int which) { |
1602 | 495 int member = method_handle_index_at(which); |
496 return impl_signature_ref_at(member, true); | |
497 } | |
498 int method_handle_klass_index_at(int which) { | |
499 int member = method_handle_index_at(which); | |
500 return impl_klass_ref_index_at(member, true); | |
501 } | |
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502 Symbol* method_type_signature_at(int which) { |
1602 | 503 int sym = method_type_index_at(which); |
504 return symbol_at(sym); | |
505 } | |
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506 |
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507 int invoke_dynamic_name_and_type_ref_index_at(int which) { |
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508 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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509 return extract_high_short_from_int(*int_at_addr(which)); |
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510 } |
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511 int invoke_dynamic_bootstrap_specifier_index(int which) { |
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512 assert(tag_at(which).value() == JVM_CONSTANT_InvokeDynamic, "Corrupted constant pool"); |
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513 return extract_low_short_from_int(*int_at_addr(which)); |
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514 } |
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515 int invoke_dynamic_operand_base(int which) { |
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516 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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517 return operand_offset_at(operands(), bootstrap_specifier_index); |
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518 } |
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519 // The first part of the operands array consists of an index into the second part. |
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520 // Extract a 32-bit index value from the first part. |
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521 static int operand_offset_at(typeArrayOop operands, int bootstrap_specifier_index) { |
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522 int n = (bootstrap_specifier_index * 2); |
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523 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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524 // The first 32-bit index points to the beginning of the second part |
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525 // of the operands array. Make sure this index is in the first part. |
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526 DEBUG_ONLY(int second_part = build_int_from_shorts(operands->short_at(0), |
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527 operands->short_at(1))); |
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528 assert(second_part == 0 || n+2 <= second_part, "oob (2)"); |
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529 int offset = build_int_from_shorts(operands->short_at(n+0), |
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530 operands->short_at(n+1)); |
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531 // The offset itself must point into the second part of the array. |
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532 assert(offset == 0 || offset >= second_part && offset <= operands->length(), "oob (3)"); |
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533 return offset; |
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534 } |
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535 static void operand_offset_at_put(typeArrayOop operands, int bootstrap_specifier_index, int offset) { |
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536 int n = bootstrap_specifier_index * 2; |
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537 assert(n >= 0 && n+2 <= operands->length(), "oob"); |
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538 operands->short_at_put(n+0, extract_low_short_from_int(offset)); |
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539 operands->short_at_put(n+1, extract_high_short_from_int(offset)); |
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540 } |
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541 static int operand_array_length(typeArrayOop operands) { |
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542 if (operands == NULL || operands->length() == 0) return 0; |
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543 int second_part = operand_offset_at(operands, 0); |
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544 return (second_part / 2); |
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545 } |
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546 |
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547 #ifdef ASSERT |
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548 // operand tuples fit together exactly, end to end |
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549 static int operand_limit_at(typeArrayOop operands, int bootstrap_specifier_index) { |
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550 int nextidx = bootstrap_specifier_index + 1; |
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551 if (nextidx == operand_array_length(operands)) |
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552 return operands->length(); |
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553 else |
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554 return operand_offset_at(operands, nextidx); |
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555 } |
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556 int invoke_dynamic_operand_limit(int which) { |
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557 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which); |
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558 return operand_limit_at(operands(), bootstrap_specifier_index); |
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559 } |
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560 #endif //ASSERT |
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561 |
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562 // layout of InvokeDynamic bootstrap method specifier (in second part of operands array): |
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563 enum { |
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564 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm |
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565 _indy_argc_offset = 1, // u2 argc |
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566 _indy_argv_offset = 2 // u2 argv[argc] |
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567 }; |
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568 int invoke_dynamic_bootstrap_method_ref_index_at(int which) { |
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569 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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570 int op_base = invoke_dynamic_operand_base(which); |
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571 return operands()->short_at(op_base + _indy_bsm_offset); |
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572 } |
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573 int invoke_dynamic_argument_count_at(int which) { |
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574 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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575 int op_base = invoke_dynamic_operand_base(which); |
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576 int argc = operands()->short_at(op_base + _indy_argc_offset); |
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577 DEBUG_ONLY(int end_offset = op_base + _indy_argv_offset + argc; |
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578 int next_offset = invoke_dynamic_operand_limit(which)); |
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579 assert(end_offset == next_offset, "matched ending"); |
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580 return argc; |
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581 } |
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582 int invoke_dynamic_argument_index_at(int which, int j) { |
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583 int op_base = invoke_dynamic_operand_base(which); |
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584 DEBUG_ONLY(int argc = operands()->short_at(op_base + _indy_argc_offset)); |
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585 assert((uint)j < (uint)argc, "oob"); |
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586 return operands()->short_at(op_base + _indy_argv_offset + j); |
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587 } |
1602 | 588 |
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589 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve, |
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590 // name_and_type_ref_index_at) all expect to be passed indices obtained |
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591 // directly from the bytecode. |
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592 // If the indices are meant to refer to fields or methods, they are |
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593 // actually rewritten constant pool cache indices. |
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594 // The routine remap_instruction_operand_from_cache manages the adjustment |
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595 // of these values back to constant pool indices. |
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596 |
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597 // There are also "uncached" versions which do not adjust the operand index; see below. |
0 | 598 |
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599 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear. |
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600 // In a few cases (the verifier) there are uses before a cpcache has been built, |
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601 // which are handled by a dynamic check in remap_instruction_operand_from_cache. |
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602 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode. |
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603 |
0 | 604 // Lookup for entries consisting of (klass_index, name_and_type index) |
605 klassOop klass_ref_at(int which, TRAPS); | |
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606 Symbol* klass_ref_at_noresolve(int which); |
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607 Symbol* name_ref_at(int which) { return impl_name_ref_at(which, false); } |
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608 Symbol* signature_ref_at(int which) { return impl_signature_ref_at(which, false); } |
0 | 609 |
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610 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); } |
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611 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); } |
0 | 612 |
613 // Lookup for entries consisting of (name_index, signature_index) | |
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614 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt) |
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615 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt) |
0 | 616 |
617 BasicType basic_type_for_signature_at(int which); | |
618 | |
619 // Resolve string constants (to prevent allocation during compilation) | |
620 void resolve_string_constants(TRAPS) { | |
621 constantPoolHandle h_this(THREAD, this); | |
622 resolve_string_constants_impl(h_this, CHECK); | |
623 } | |
624 | |
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625 private: |
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626 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 }; |
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627 public: |
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628 |
1602 | 629 // Resolve late bound constants. |
630 oop resolve_constant_at(int index, TRAPS) { | |
631 constantPoolHandle h_this(THREAD, this); | |
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632 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD); |
1602 | 633 } |
634 | |
635 oop resolve_cached_constant_at(int cache_index, TRAPS) { | |
636 constantPoolHandle h_this(THREAD, this); | |
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637 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD); |
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638 } |
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639 |
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640 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) { |
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641 constantPoolHandle h_this(THREAD, this); |
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642 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD); |
1602 | 643 } |
644 | |
0 | 645 // Klass name matches name at offset |
646 bool klass_name_at_matches(instanceKlassHandle k, int which); | |
647 | |
648 // Sizing | |
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649 int length() const { return _length; } |
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650 void set_length(int length) { _length = length; } |
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651 |
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652 // Tells whether index is within bounds. |
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653 bool is_within_bounds(int index) const { |
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654 return 0 <= index && index < length(); |
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655 } |
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656 |
0 | 657 static int header_size() { return sizeof(constantPoolOopDesc)/HeapWordSize; } |
658 static int object_size(int length) { return align_object_size(header_size() + length); } | |
659 int object_size() { return object_size(length()); } | |
660 | |
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661 bool is_conc_safe() { return _is_conc_safe; } |
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662 void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
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663 |
0 | 664 friend class constantPoolKlass; |
665 friend class ClassFileParser; | |
666 friend class SystemDictionary; | |
667 | |
668 // Used by compiler to prevent classloading. | |
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669 static methodOop method_at_if_loaded (constantPoolHandle this_oop, int which, |
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670 Bytecodes::Code bc = Bytecodes::_illegal); |
0 | 671 static klassOop klass_at_if_loaded (constantPoolHandle this_oop, int which); |
672 static klassOop klass_ref_at_if_loaded (constantPoolHandle this_oop, int which); | |
673 // Same as above - but does LinkResolving. | |
674 static klassOop klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int which, TRAPS); | |
675 | |
676 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the | |
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677 // future by other Java code. These take constant pool indices rather than |
0 | 678 // constant pool cache indices as do the peer methods above. |
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679 Symbol* uncached_klass_ref_at_noresolve(int which); |
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680 Symbol* uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); } |
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681 Symbol* uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); } |
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682 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); } |
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683 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); } |
0 | 684 |
685 // Sharing | |
686 int pre_resolve_shared_klasses(TRAPS); | |
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687 void shared_symbols_iterate(SymbolClosure* closure0); |
0 | 688 void shared_tags_iterate(OopClosure* closure0); |
689 void shared_strings_iterate(OopClosure* closure0); | |
690 | |
691 // Debugging | |
692 const char* printable_name_at(int which) PRODUCT_RETURN0; | |
693 | |
1565 | 694 #ifdef ASSERT |
695 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices | |
1602 | 696 #else |
697 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op | |
1565 | 698 #endif //ASSERT |
699 | |
0 | 700 private: |
701 | |
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702 Symbol* impl_name_ref_at(int which, bool uncached); |
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703 Symbol* impl_signature_ref_at(int which, bool uncached); |
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704 int impl_klass_ref_index_at(int which, bool uncached); |
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705 int impl_name_and_type_ref_index_at(int which, bool uncached); |
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706 |
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707 public: |
1565 | 708 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG |
0 | 709 |
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710 private: |
0 | 711 // Used while constructing constant pool (only by ClassFileParser) |
712 jint klass_index_at(int which) { | |
713 assert(tag_at(which).is_klass_index(), "Corrupted constant pool"); | |
714 return *int_at_addr(which); | |
715 } | |
716 | |
717 jint string_index_at(int which) { | |
718 assert(tag_at(which).is_string_index(), "Corrupted constant pool"); | |
719 return *int_at_addr(which); | |
720 } | |
721 | |
722 // Performs the LinkResolver checks | |
723 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS); | |
724 | |
725 // Implementation of methods that needs an exposed 'this' pointer, in order to | |
726 // handle GC while executing the method | |
727 static klassOop klass_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
728 static oop string_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
729 | |
730 // Resolve string constants (to prevent allocation during compilation) | |
731 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS); | |
732 | |
1602 | 733 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS); |
734 | |
0 | 735 public: |
736 // Merging constantPoolOop support: | |
737 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS); | |
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738 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS) { |
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739 constantPoolHandle h_this(THREAD, this); |
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740 copy_cp_to_impl(h_this, start_i, end_i, to_cp, to_i, THREAD); |
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741 } |
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742 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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743 static void copy_entry_to(constantPoolHandle from_cp, int from_i, constantPoolHandle to_cp, int to_i, TRAPS); |
0 | 744 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS); |
745 int orig_length() const { return _orig_length; } | |
746 void set_orig_length(int orig_length) { _orig_length = orig_length; } | |
747 | |
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748 // Decrease ref counts of symbols that are in the constant pool |
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749 // when the holder class is unloaded |
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750 void unreference_symbols(); |
0 | 751 |
752 // JVMTI accesss - GetConstantPool, RetransformClasses, ... | |
753 friend class JvmtiConstantPoolReconstituter; | |
754 | |
755 private: | |
756 jint cpool_entry_size(jint idx); | |
757 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap); | |
758 | |
759 // Copy cpool bytes into byte array. | |
760 // Returns: | |
761 // int > 0, count of the raw cpool bytes that have been copied | |
762 // 0, OutOfMemory error | |
763 // -1, Internal error | |
764 int copy_cpool_bytes(int cpool_size, | |
765 SymbolHashMap* tbl, | |
766 unsigned char *bytes); | |
767 }; | |
768 | |
769 class SymbolHashMapEntry : public CHeapObj { | |
770 private: | |
771 unsigned int _hash; // 32-bit hash for item | |
772 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket | |
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773 Symbol* _symbol; // 1-st part of the mapping: symbol => value |
0 | 774 u2 _value; // 2-nd part of the mapping: symbol => value |
775 | |
776 public: | |
777 unsigned int hash() const { return _hash; } | |
778 void set_hash(unsigned int hash) { _hash = hash; } | |
779 | |
780 SymbolHashMapEntry* next() const { return _next; } | |
781 void set_next(SymbolHashMapEntry* next) { _next = next; } | |
782 | |
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783 Symbol* symbol() const { return _symbol; } |
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784 void set_symbol(Symbol* sym) { _symbol = sym; } |
0 | 785 |
786 u2 value() const { return _value; } | |
787 void set_value(u2 value) { _value = value; } | |
788 | |
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789 SymbolHashMapEntry(unsigned int hash, Symbol* symbol, u2 value) |
0 | 790 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {} |
791 | |
792 }; // End SymbolHashMapEntry class | |
793 | |
794 | |
795 class SymbolHashMapBucket : public CHeapObj { | |
796 | |
797 private: | |
798 SymbolHashMapEntry* _entry; | |
799 | |
800 public: | |
801 SymbolHashMapEntry* entry() const { return _entry; } | |
802 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; } | |
803 void clear() { _entry = NULL; } | |
804 | |
805 }; // End SymbolHashMapBucket class | |
806 | |
807 | |
808 class SymbolHashMap: public CHeapObj { | |
809 | |
810 private: | |
811 // Default number of entries in the table | |
812 enum SymbolHashMap_Constants { | |
813 _Def_HashMap_Size = 256 | |
814 }; | |
815 | |
816 int _table_size; | |
817 SymbolHashMapBucket* _buckets; | |
818 | |
819 void initialize_table(int table_size) { | |
820 _table_size = table_size; | |
821 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size); | |
822 for (int index = 0; index < table_size; index++) { | |
823 _buckets[index].clear(); | |
824 } | |
825 } | |
826 | |
827 public: | |
828 | |
829 int table_size() const { return _table_size; } | |
830 | |
831 SymbolHashMap() { initialize_table(_Def_HashMap_Size); } | |
832 SymbolHashMap(int table_size) { initialize_table(table_size); } | |
833 | |
834 // hash P(31) from Kernighan & Ritchie | |
835 static unsigned int compute_hash(const char* str, int len) { | |
836 unsigned int hash = 0; | |
837 while (len-- > 0) { | |
838 hash = 31*hash + (unsigned) *str; | |
839 str++; | |
840 } | |
841 return hash; | |
842 } | |
843 | |
844 SymbolHashMapEntry* bucket(int i) { | |
845 return _buckets[i].entry(); | |
846 } | |
847 | |
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848 void add_entry(Symbol* sym, u2 value); |
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849 SymbolHashMapEntry* find_entry(Symbol* sym); |
0 | 850 |
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851 u2 symbol_to_value(Symbol* sym) { |
0 | 852 SymbolHashMapEntry *entry = find_entry(sym); |
853 return (entry == NULL) ? 0 : entry->value(); | |
854 } | |
855 | |
856 ~SymbolHashMap() { | |
857 SymbolHashMapEntry* next; | |
858 for (int i = 0; i < _table_size; i++) { | |
859 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) { | |
860 next = cur->next(); | |
861 delete(cur); | |
862 } | |
863 } | |
864 delete _buckets; | |
865 } | |
866 }; // End SymbolHashMap class | |
1972 | 867 |
868 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP |