Mercurial > hg > graal-jvmci-8
annotate src/share/vm/oops/constantPoolOop.hpp @ 1913:3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
Summary: Allow CONSTANT_InvokeDynamic nodes to have any number of extra operands.
Reviewed-by: twisti
| author | jrose |
|---|---|
| date | Sat, 30 Oct 2010 13:08:23 -0700 |
| parents | d1896d1dda3e |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1579 | 2 * Copyright (c) 1997, 2010, 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 | |
| 25 // A constantPool is an array containing class constants as described in the | |
| 26 // class file. | |
| 27 // | |
| 28 // Most of the constant pool entries are written during class parsing, which | |
| 29 // is safe. For klass and string types, the constant pool entry is | |
| 30 // modified when the entry is resolved. If a klass or string constant pool | |
| 31 // entry is read without a lock, only the resolved state guarantees that | |
| 32 // the entry in the constant pool is a klass or String object and | |
| 33 // not a symbolOop. | |
| 34 | |
| 35 class SymbolHashMap; | |
| 36 | |
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37 class constantPoolOopDesc : public oopDesc { |
| 0 | 38 friend class VMStructs; |
| 39 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast | |
| 40 private: | |
| 41 typeArrayOop _tags; // the tag array describing the constant pool's contents | |
| 42 constantPoolCacheOop _cache; // the cache holding interpreter runtime information | |
| 43 klassOop _pool_holder; // the corresponding class | |
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44 typeArrayOop _operands; // for variable-sized (InvokeDynamic) nodes, usually empty |
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45 int _flags; // a few header bits to describe contents for GC |
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46 int _length; // number of elements in the array |
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47 volatile bool _is_conc_safe; // if true, safe for concurrent |
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48 // GC processing |
| 0 | 49 // only set to non-zero if constant pool is merged by RedefineClasses |
| 50 int _orig_length; | |
| 51 | |
| 52 void set_tags(typeArrayOop tags) { oop_store_without_check((oop*)&_tags, tags); } | |
| 53 void tag_at_put(int which, jbyte t) { tags()->byte_at_put(which, t); } | |
| 54 void release_tag_at_put(int which, jbyte t) { tags()->release_byte_at_put(which, t); } | |
| 55 | |
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56 void set_operands(typeArrayOop operands) { oop_store_without_check((oop*)&_operands, operands); } |
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57 |
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58 enum FlagBit { |
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59 FB_has_invokedynamic = 1, |
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60 FB_has_pseudo_string = 2 |
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61 }; |
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62 |
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63 int flags() const { return _flags; } |
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64 void set_flags(int f) { _flags = f; } |
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65 bool flag_at(FlagBit fb) const { return (_flags & (1 << (int)fb)) != 0; } |
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66 void set_flag_at(FlagBit fb); |
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67 // no clear_flag_at function; they only increase |
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68 |
| 0 | 69 private: |
| 70 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(constantPoolOopDesc)); } | |
| 71 oop* tags_addr() { return (oop*)&_tags; } | |
| 72 oop* cache_addr() { return (oop*)&_cache; } | |
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73 oop* operands_addr() { return (oop*)&_operands; } |
| 0 | 74 |
| 75 oop* obj_at_addr(int which) const { | |
| 76 assert(is_within_bounds(which), "index out of bounds"); | |
| 77 return (oop*) &base()[which]; | |
| 78 } | |
| 79 | |
| 80 jint* int_at_addr(int which) const { | |
| 81 assert(is_within_bounds(which), "index out of bounds"); | |
| 82 return (jint*) &base()[which]; | |
| 83 } | |
| 84 | |
| 85 jlong* long_at_addr(int which) const { | |
| 86 assert(is_within_bounds(which), "index out of bounds"); | |
| 87 return (jlong*) &base()[which]; | |
| 88 } | |
| 89 | |
| 90 jfloat* float_at_addr(int which) const { | |
| 91 assert(is_within_bounds(which), "index out of bounds"); | |
| 92 return (jfloat*) &base()[which]; | |
| 93 } | |
| 94 | |
| 95 jdouble* double_at_addr(int which) const { | |
| 96 assert(is_within_bounds(which), "index out of bounds"); | |
| 97 return (jdouble*) &base()[which]; | |
| 98 } | |
| 99 | |
| 100 public: | |
| 101 typeArrayOop tags() const { return _tags; } | |
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102 typeArrayOop operands() const { return _operands; } |
| 0 | 103 |
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104 bool has_pseudo_string() const { return flag_at(FB_has_pseudo_string); } |
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105 bool has_invokedynamic() const { return flag_at(FB_has_invokedynamic); } |
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106 void set_pseudo_string() { set_flag_at(FB_has_pseudo_string); } |
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107 void set_invokedynamic() { set_flag_at(FB_has_invokedynamic); } |
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108 |
| 0 | 109 // Klass holding pool |
| 110 klassOop pool_holder() const { return _pool_holder; } | |
| 111 void set_pool_holder(klassOop k) { oop_store_without_check((oop*)&_pool_holder, (oop) k); } | |
| 112 oop* pool_holder_addr() { return (oop*)&_pool_holder; } | |
| 113 | |
| 114 // Interpreter runtime support | |
| 115 constantPoolCacheOop cache() const { return _cache; } | |
| 116 void set_cache(constantPoolCacheOop cache){ oop_store((oop*)&_cache, cache); } | |
| 117 | |
| 118 // Assembly code support | |
| 119 static int tags_offset_in_bytes() { return offset_of(constantPoolOopDesc, _tags); } | |
| 120 static int cache_offset_in_bytes() { return offset_of(constantPoolOopDesc, _cache); } | |
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121 static int operands_offset_in_bytes() { return offset_of(constantPoolOopDesc, _operands); } |
| 0 | 122 static int pool_holder_offset_in_bytes() { return offset_of(constantPoolOopDesc, _pool_holder); } |
| 123 | |
| 124 // Storing constants | |
| 125 | |
| 126 void klass_at_put(int which, klassOop k) { | |
| 127 oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k)); | |
| 128 // The interpreter assumes when the tag is stored, the klass is resolved | |
| 129 // and the klassOop is a klass rather than a symbolOop, so we need | |
| 130 // hardware store ordering here. | |
| 131 release_tag_at_put(which, JVM_CONSTANT_Class); | |
| 132 if (UseConcMarkSweepGC) { | |
| 133 // In case the earlier card-mark was consumed by a concurrent | |
| 134 // marking thread before the tag was updated, redirty the card. | |
| 135 oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k)); | |
| 136 } | |
| 137 } | |
| 138 | |
| 139 // For temporary use while constructing constant pool | |
| 140 void klass_index_at_put(int which, int name_index) { | |
| 141 tag_at_put(which, JVM_CONSTANT_ClassIndex); | |
| 142 *int_at_addr(which) = name_index; | |
| 143 } | |
| 144 | |
| 145 // Temporary until actual use | |
| 146 void unresolved_klass_at_put(int which, symbolOop s) { | |
| 147 // Overwrite the old index with a GC friendly value so | |
| 148 // that if GC looks during the transition it won't try | |
| 149 // to treat a small integer as oop. | |
| 150 *obj_at_addr(which) = NULL; | |
| 151 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass); | |
| 152 oop_store_without_check(obj_at_addr(which), oop(s)); | |
| 153 } | |
| 154 | |
| 1602 | 155 void method_handle_index_at_put(int which, int ref_kind, int ref_index) { |
| 156 tag_at_put(which, JVM_CONSTANT_MethodHandle); | |
| 157 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind; | |
| 158 } | |
| 159 | |
| 160 void method_type_index_at_put(int which, int ref_index) { | |
| 161 tag_at_put(which, JVM_CONSTANT_MethodType); | |
| 162 *int_at_addr(which) = ref_index; | |
| 163 } | |
| 164 | |
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165 void invoke_dynamic_at_put(int which, int operand_base, int operand_count) { |
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166 tag_at_put(which, JVM_CONSTANT_InvokeDynamic); |
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167 *int_at_addr(which) = operand_base; // this is the real information |
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168 } |
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169 #ifdef ASSERT |
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170 bool check_invoke_dynamic_at(int which, |
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171 int bootstrap_method_index, |
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172 int name_and_type_index, |
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173 int argument_count) { |
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174 assert(invoke_dynamic_bootstrap_method_ref_index_at(which) == bootstrap_method_index, |
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175 "already stored by caller"); |
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176 assert(invoke_dynamic_name_and_type_ref_index_at(which) == name_and_type_index, |
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177 "already stored by caller"); |
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178 assert(invoke_dynamic_argument_count_at(which) == argument_count, |
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179 "consistent argument count"); |
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180 if (argument_count != 0) { |
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181 invoke_dynamic_argument_index_at(which, 0); |
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182 invoke_dynamic_argument_index_at(which, argument_count - 1); |
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183 } |
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184 return true; |
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185 } |
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186 #endif //ASSERT |
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187 |
| 0 | 188 // Temporary until actual use |
| 189 void unresolved_string_at_put(int which, symbolOop s) { | |
| 190 *obj_at_addr(which) = NULL; | |
| 191 release_tag_at_put(which, JVM_CONSTANT_UnresolvedString); | |
| 192 oop_store_without_check(obj_at_addr(which), oop(s)); | |
| 193 } | |
| 194 | |
| 195 void int_at_put(int which, jint i) { | |
| 196 tag_at_put(which, JVM_CONSTANT_Integer); | |
| 197 *int_at_addr(which) = i; | |
| 198 } | |
| 199 | |
| 200 void long_at_put(int which, jlong l) { | |
| 201 tag_at_put(which, JVM_CONSTANT_Long); | |
| 202 // *long_at_addr(which) = l; | |
| 203 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l)); | |
| 204 } | |
| 205 | |
| 206 void float_at_put(int which, jfloat f) { | |
| 207 tag_at_put(which, JVM_CONSTANT_Float); | |
| 208 *float_at_addr(which) = f; | |
| 209 } | |
| 210 | |
| 211 void double_at_put(int which, jdouble d) { | |
| 212 tag_at_put(which, JVM_CONSTANT_Double); | |
| 213 // *double_at_addr(which) = d; | |
| 214 // u8 temp = *(u8*) &d; | |
| 215 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d)); | |
| 216 } | |
| 217 | |
| 218 void symbol_at_put(int which, symbolOop s) { | |
| 219 tag_at_put(which, JVM_CONSTANT_Utf8); | |
| 220 oop_store_without_check(obj_at_addr(which), oop(s)); | |
| 221 } | |
| 222 | |
| 223 void string_at_put(int which, oop str) { | |
| 224 oop_store((volatile oop*)obj_at_addr(which), str); | |
| 225 release_tag_at_put(which, JVM_CONSTANT_String); | |
| 226 if (UseConcMarkSweepGC) { | |
| 227 // In case the earlier card-mark was consumed by a concurrent | |
| 228 // marking thread before the tag was updated, redirty the card. | |
| 229 oop_store_without_check((volatile oop *)obj_at_addr(which), str); | |
| 230 } | |
| 231 } | |
| 232 | |
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233 void object_at_put(int which, oop str) { |
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234 oop_store((volatile oop*) obj_at_addr(which), str); |
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235 release_tag_at_put(which, JVM_CONSTANT_Object); |
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236 if (UseConcMarkSweepGC) { |
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237 // In case the earlier card-mark was consumed by a concurrent |
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238 // marking thread before the tag was updated, redirty the card. |
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239 oop_store_without_check((volatile oop*) obj_at_addr(which), str); |
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240 } |
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241 } |
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242 |
| 0 | 243 // For temporary use while constructing constant pool |
| 244 void string_index_at_put(int which, int string_index) { | |
| 245 tag_at_put(which, JVM_CONSTANT_StringIndex); | |
| 246 *int_at_addr(which) = string_index; | |
| 247 } | |
| 248 | |
| 249 void field_at_put(int which, int class_index, int name_and_type_index) { | |
| 250 tag_at_put(which, JVM_CONSTANT_Fieldref); | |
| 251 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
| 252 } | |
| 253 | |
| 254 void method_at_put(int which, int class_index, int name_and_type_index) { | |
| 255 tag_at_put(which, JVM_CONSTANT_Methodref); | |
| 256 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; | |
| 257 } | |
| 258 | |
| 259 void interface_method_at_put(int which, int class_index, int name_and_type_index) { | |
| 260 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref); | |
| 261 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice | |
| 262 } | |
| 263 | |
| 264 void name_and_type_at_put(int which, int name_index, int signature_index) { | |
| 265 tag_at_put(which, JVM_CONSTANT_NameAndType); | |
| 266 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice | |
| 267 } | |
| 268 | |
| 269 // Tag query | |
| 270 | |
| 271 constantTag tag_at(int which) const { return (constantTag)tags()->byte_at_acquire(which); } | |
| 272 | |
| 273 // Whether the entry is a pointer that must be GC'd. | |
| 274 bool is_pointer_entry(int which) { | |
| 275 constantTag tag = tag_at(which); | |
| 276 return tag.is_klass() || | |
| 277 tag.is_unresolved_klass() || | |
| 278 tag.is_symbol() || | |
| 279 tag.is_unresolved_string() || | |
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280 tag.is_string() || |
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281 tag.is_object(); |
| 0 | 282 } |
| 283 | |
| 284 // Fetching constants | |
| 285 | |
| 286 klassOop klass_at(int which, TRAPS) { | |
| 287 constantPoolHandle h_this(THREAD, this); | |
| 288 return klass_at_impl(h_this, which, CHECK_NULL); | |
| 289 } | |
| 290 | |
| 291 symbolOop klass_name_at(int which); // Returns the name, w/o resolving. | |
| 292 | |
| 293 klassOop resolved_klass_at(int which) { // Used by Compiler | |
| 294 guarantee(tag_at(which).is_klass(), "Corrupted constant pool"); | |
| 295 // Must do an acquire here in case another thread resolved the klass | |
| 296 // behind our back, lest we later load stale values thru the oop. | |
| 297 return klassOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which))); | |
| 298 } | |
| 299 | |
| 300 // This method should only be used with a cpool lock or during parsing or gc | |
| 301 symbolOop unresolved_klass_at(int which) { // Temporary until actual use | |
| 302 symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which))); | |
| 303 // check that the klass is still unresolved. | |
| 304 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool"); | |
| 305 return s; | |
| 306 } | |
| 307 | |
| 308 // RedefineClasses() API support: | |
| 309 symbolOop klass_at_noresolve(int which) { return klass_name_at(which); } | |
| 310 | |
| 311 jint int_at(int which) { | |
| 312 assert(tag_at(which).is_int(), "Corrupted constant pool"); | |
| 313 return *int_at_addr(which); | |
| 314 } | |
| 315 | |
| 316 jlong long_at(int which) { | |
| 317 assert(tag_at(which).is_long(), "Corrupted constant pool"); | |
| 318 // return *long_at_addr(which); | |
| 319 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
| 320 return *((jlong*)&tmp); | |
| 321 } | |
| 322 | |
| 323 jfloat float_at(int which) { | |
| 324 assert(tag_at(which).is_float(), "Corrupted constant pool"); | |
| 325 return *float_at_addr(which); | |
| 326 } | |
| 327 | |
| 328 jdouble double_at(int which) { | |
| 329 assert(tag_at(which).is_double(), "Corrupted constant pool"); | |
| 330 u8 tmp = Bytes::get_native_u8((address)&base()[which]); | |
| 331 return *((jdouble*)&tmp); | |
| 332 } | |
| 333 | |
| 334 symbolOop symbol_at(int which) { | |
| 335 assert(tag_at(which).is_utf8(), "Corrupted constant pool"); | |
| 336 return symbolOop(*obj_at_addr(which)); | |
| 337 } | |
| 338 | |
| 339 oop string_at(int which, TRAPS) { | |
| 340 constantPoolHandle h_this(THREAD, this); | |
| 341 return string_at_impl(h_this, which, CHECK_NULL); | |
| 342 } | |
| 343 | |
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344 oop object_at(int which) { |
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345 assert(tag_at(which).is_object(), "Corrupted constant pool"); |
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346 return *obj_at_addr(which); |
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347 } |
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348 |
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349 // A "pseudo-string" is an non-string oop that has found is way into |
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350 // a String entry. |
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351 // Under AnonymousClasses this can happen if the user patches a live |
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352 // object into a CONSTANT_String entry of an anonymous class. |
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353 // Method oops internally created for method handles may also |
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354 // use pseudo-strings to link themselves to related metaobjects. |
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355 |
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356 bool is_pseudo_string_at(int which); |
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357 |
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358 oop pseudo_string_at(int which) { |
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359 assert(tag_at(which).is_string(), "Corrupted constant pool"); |
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360 return *obj_at_addr(which); |
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361 } |
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362 |
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363 void pseudo_string_at_put(int which, oop x) { |
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364 assert(AnonymousClasses, ""); |
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365 set_pseudo_string(); // mark header |
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366 assert(tag_at(which).is_string() || tag_at(which).is_unresolved_string(), "Corrupted constant pool"); |
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367 string_at_put(which, x); // this works just fine |
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368 } |
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369 |
| 0 | 370 // only called when we are sure a string entry is already resolved (via an |
| 371 // earlier string_at call. | |
| 372 oop resolved_string_at(int which) { | |
| 373 assert(tag_at(which).is_string(), "Corrupted constant pool"); | |
| 374 // Must do an acquire here in case another thread resolved the klass | |
| 375 // behind our back, lest we later load stale values thru the oop. | |
| 376 return (oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)); | |
| 377 } | |
| 378 | |
| 379 // This method should only be used with a cpool lock or during parsing or gc | |
| 380 symbolOop unresolved_string_at(int which) { // Temporary until actual use | |
| 381 symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which))); | |
| 382 // check that the string is still unresolved. | |
| 383 assert(tag_at(which).is_unresolved_string(), "Corrupted constant pool"); | |
| 384 return s; | |
| 385 } | |
| 386 | |
| 387 // Returns an UTF8 for a CONSTANT_String entry at a given index. | |
| 388 // UTF8 char* representation was chosen to avoid conversion of | |
| 389 // java_lang_Strings at resolved entries into symbolOops | |
| 390 // or vice versa. | |
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391 // Caller is responsible for checking for pseudo-strings. |
| 0 | 392 char* string_at_noresolve(int which); |
| 393 | |
| 394 jint name_and_type_at(int which) { | |
| 395 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool"); | |
| 396 return *int_at_addr(which); | |
| 397 } | |
| 398 | |
| 1602 | 399 int method_handle_ref_kind_at(int which) { |
| 400 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
| 401 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits | |
| 402 } | |
| 403 int method_handle_index_at(int which) { | |
| 404 assert(tag_at(which).is_method_handle(), "Corrupted constant pool"); | |
| 405 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits | |
| 406 } | |
| 407 int method_type_index_at(int which) { | |
| 408 assert(tag_at(which).is_method_type(), "Corrupted constant pool"); | |
| 409 return *int_at_addr(which); | |
| 410 } | |
| 411 // Derived queries: | |
| 412 symbolOop method_handle_name_ref_at(int which) { | |
| 413 int member = method_handle_index_at(which); | |
| 414 return impl_name_ref_at(member, true); | |
| 415 } | |
| 416 symbolOop method_handle_signature_ref_at(int which) { | |
| 417 int member = method_handle_index_at(which); | |
| 418 return impl_signature_ref_at(member, true); | |
| 419 } | |
| 420 int method_handle_klass_index_at(int which) { | |
| 421 int member = method_handle_index_at(which); | |
| 422 return impl_klass_ref_index_at(member, true); | |
| 423 } | |
| 424 symbolOop method_type_signature_at(int which) { | |
| 425 int sym = method_type_index_at(which); | |
| 426 return symbol_at(sym); | |
| 427 } | |
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428 |
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429 private: |
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430 // some nodes (InvokeDynamic) have a variable number of operands, each a u2 value |
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431 enum { _multi_operand_count_offset = -1, |
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432 _multi_operand_base_offset = 0, |
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433 _multi_operand_buffer_fill_pointer_offset = 0 // shared at front of operands array |
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434 }; |
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435 int multi_operand_buffer_length() { |
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436 return operands() == NULL ? 0 : operands()->length(); |
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437 } |
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438 int multi_operand_buffer_fill_pointer() { |
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439 return operands() == NULL |
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440 ? _multi_operand_buffer_fill_pointer_offset + 1 |
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441 : operands()->int_at(_multi_operand_buffer_fill_pointer_offset); |
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442 } |
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443 void multi_operand_buffer_grow(int min_length, TRAPS); |
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444 void set_multi_operand_buffer_fill_pointer(int fillp) { |
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445 assert(operands() != NULL, ""); |
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446 operands()->int_at_put(_multi_operand_buffer_fill_pointer_offset, fillp); |
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447 } |
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448 int multi_operand_base_at(int which) { |
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449 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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450 int op_base = *int_at_addr(which); |
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451 assert(op_base > _multi_operand_buffer_fill_pointer_offset, "Corrupted operand base"); |
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452 return op_base; |
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453 } |
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454 int multi_operand_count_at(int which) { |
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455 int op_base = multi_operand_base_at(which); |
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456 assert((uint)(op_base + _multi_operand_count_offset) < (uint)operands()->length(), "oob"); |
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457 int count = operands()->int_at(op_base + _multi_operand_count_offset); |
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458 return count; |
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459 } |
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460 int multi_operand_ref_at(int which, int i) { |
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461 int op_base = multi_operand_base_at(which); |
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462 assert((uint)i < (uint)multi_operand_count_at(which), "oob"); |
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463 assert((uint)(op_base + _multi_operand_base_offset + i) < (uint)operands()->length(), "oob"); |
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464 return operands()->int_at(op_base + _multi_operand_base_offset + i); |
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465 } |
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466 void set_multi_operand_ref_at(int which, int i, int ref) { |
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467 DEBUG_ONLY(multi_operand_ref_at(which, i)); // trigger asserts |
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468 int op_base = multi_operand_base_at(which); |
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469 operands()->int_at_put(op_base + _multi_operand_base_offset + i, ref); |
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470 } |
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471 |
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472 public: |
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473 // layout of InvokeDynamic: |
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474 enum { |
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475 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm |
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476 _indy_nt_offset = 1, // CONSTANT_NameAndType descr |
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477 _indy_argc_offset = 2, // u2 argc |
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478 _indy_argv_offset = 3 // u2 argv[argc] |
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479 }; |
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480 int invoke_dynamic_bootstrap_method_ref_index_at(int which) { |
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481 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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482 return multi_operand_ref_at(which, _indy_bsm_offset); |
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483 } |
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484 int invoke_dynamic_name_and_type_ref_index_at(int which) { |
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485 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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486 return multi_operand_ref_at(which, _indy_nt_offset); |
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487 } |
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488 int invoke_dynamic_argument_count_at(int which) { |
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489 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool"); |
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490 int argc = multi_operand_ref_at(which, _indy_argc_offset); |
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491 DEBUG_ONLY(int op_count = multi_operand_count_at(which)); |
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492 assert(_indy_argv_offset + argc == op_count, "consistent inner and outer counts"); |
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493 return argc; |
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494 } |
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495 int invoke_dynamic_argument_index_at(int which, int j) { |
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496 assert((uint)j < (uint)invoke_dynamic_argument_count_at(which), "oob"); |
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497 return multi_operand_ref_at(which, _indy_argv_offset + j); |
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498 } |
| 1602 | 499 |
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500 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve, |
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501 // name_and_type_ref_index_at) all expect to be passed indices obtained |
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502 // directly from the bytecode. |
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503 // If the indices are meant to refer to fields or methods, they are |
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504 // actually rewritten constant pool cache indices. |
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505 // The routine remap_instruction_operand_from_cache manages the adjustment |
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506 // of these values back to constant pool indices. |
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507 |
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508 // There are also "uncached" versions which do not adjust the operand index; see below. |
| 0 | 509 |
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510 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear. |
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511 // In a few cases (the verifier) there are uses before a cpcache has been built, |
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512 // which are handled by a dynamic check in remap_instruction_operand_from_cache. |
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513 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode. |
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514 |
| 0 | 515 // Lookup for entries consisting of (klass_index, name_and_type index) |
| 516 klassOop klass_ref_at(int which, TRAPS); | |
| 517 symbolOop klass_ref_at_noresolve(int which); | |
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518 symbolOop name_ref_at(int which) { return impl_name_ref_at(which, false); } |
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519 symbolOop signature_ref_at(int which) { return impl_signature_ref_at(which, false); } |
| 0 | 520 |
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521 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); } |
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522 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); } |
| 0 | 523 |
| 524 // Lookup for entries consisting of (name_index, signature_index) | |
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525 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt) |
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526 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt) |
| 0 | 527 |
| 528 BasicType basic_type_for_signature_at(int which); | |
| 529 | |
| 530 // Resolve string constants (to prevent allocation during compilation) | |
| 531 void resolve_string_constants(TRAPS) { | |
| 532 constantPoolHandle h_this(THREAD, this); | |
| 533 resolve_string_constants_impl(h_this, CHECK); | |
| 534 } | |
| 535 | |
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536 private: |
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537 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 }; |
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538 public: |
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539 |
| 1602 | 540 // Resolve late bound constants. |
| 541 oop resolve_constant_at(int index, TRAPS) { | |
| 542 constantPoolHandle h_this(THREAD, this); | |
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543 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD); |
| 1602 | 544 } |
| 545 | |
| 546 oop resolve_cached_constant_at(int cache_index, TRAPS) { | |
| 547 constantPoolHandle h_this(THREAD, this); | |
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548 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD); |
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549 } |
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550 |
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551 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) { |
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552 constantPoolHandle h_this(THREAD, this); |
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553 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD); |
| 1602 | 554 } |
| 555 | |
| 0 | 556 // Klass name matches name at offset |
| 557 bool klass_name_at_matches(instanceKlassHandle k, int which); | |
| 558 | |
| 559 // Sizing | |
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560 int length() const { return _length; } |
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561 void set_length(int length) { _length = length; } |
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562 |
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563 // Tells whether index is within bounds. |
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564 bool is_within_bounds(int index) const { |
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565 return 0 <= index && index < length(); |
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566 } |
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567 |
| 0 | 568 static int header_size() { return sizeof(constantPoolOopDesc)/HeapWordSize; } |
| 569 static int object_size(int length) { return align_object_size(header_size() + length); } | |
| 570 int object_size() { return object_size(length()); } | |
| 571 | |
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572 bool is_conc_safe() { return _is_conc_safe; } |
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573 void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
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574 |
| 0 | 575 friend class constantPoolKlass; |
| 576 friend class ClassFileParser; | |
| 577 friend class SystemDictionary; | |
| 578 | |
| 579 // Used by compiler to prevent classloading. | |
| 580 static klassOop klass_at_if_loaded (constantPoolHandle this_oop, int which); | |
| 581 static klassOop klass_ref_at_if_loaded (constantPoolHandle this_oop, int which); | |
| 582 // Same as above - but does LinkResolving. | |
| 583 static klassOop klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int which, TRAPS); | |
| 584 | |
| 585 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the | |
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586 // future by other Java code. These take constant pool indices rather than |
| 0 | 587 // constant pool cache indices as do the peer methods above. |
| 1602 | 588 symbolOop uncached_klass_ref_at_noresolve(int which); |
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589 symbolOop uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); } |
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590 symbolOop uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); } |
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591 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); } |
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592 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); } |
| 0 | 593 |
| 594 // Sharing | |
| 595 int pre_resolve_shared_klasses(TRAPS); | |
| 596 void shared_symbols_iterate(OopClosure* closure0); | |
| 597 void shared_tags_iterate(OopClosure* closure0); | |
| 598 void shared_strings_iterate(OopClosure* closure0); | |
| 599 | |
| 600 // Debugging | |
| 601 const char* printable_name_at(int which) PRODUCT_RETURN0; | |
| 602 | |
| 1565 | 603 #ifdef ASSERT |
| 604 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices | |
| 1602 | 605 #else |
| 606 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op | |
| 1565 | 607 #endif //ASSERT |
| 608 | |
| 0 | 609 private: |
| 610 | |
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611 symbolOop impl_name_ref_at(int which, bool uncached); |
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612 symbolOop impl_signature_ref_at(int which, bool uncached); |
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613 int impl_klass_ref_index_at(int which, bool uncached); |
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614 int impl_name_and_type_ref_index_at(int which, bool uncached); |
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615 |
| 1565 | 616 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG |
| 0 | 617 |
| 618 // Used while constructing constant pool (only by ClassFileParser) | |
| 619 jint klass_index_at(int which) { | |
| 620 assert(tag_at(which).is_klass_index(), "Corrupted constant pool"); | |
| 621 return *int_at_addr(which); | |
| 622 } | |
| 623 | |
| 624 jint string_index_at(int which) { | |
| 625 assert(tag_at(which).is_string_index(), "Corrupted constant pool"); | |
| 626 return *int_at_addr(which); | |
| 627 } | |
| 628 | |
| 629 // Performs the LinkResolver checks | |
| 630 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS); | |
| 631 | |
| 632 // Implementation of methods that needs an exposed 'this' pointer, in order to | |
| 633 // handle GC while executing the method | |
| 634 static klassOop klass_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
| 635 static oop string_at_impl(constantPoolHandle this_oop, int which, TRAPS); | |
| 636 | |
| 637 // Resolve string constants (to prevent allocation during compilation) | |
| 638 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS); | |
| 639 | |
| 1602 | 640 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS); |
| 641 | |
| 0 | 642 public: |
| 643 // Merging constantPoolOop support: | |
| 644 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS); | |
| 645 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, | |
| 646 TRAPS); | |
| 647 void copy_entry_to(int from_i, constantPoolHandle to_cp, int to_i, TRAPS); | |
| 648 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS); | |
| 649 int orig_length() const { return _orig_length; } | |
| 650 void set_orig_length(int orig_length) { _orig_length = orig_length; } | |
| 651 | |
| 652 | |
| 653 // JVMTI accesss - GetConstantPool, RetransformClasses, ... | |
| 654 friend class JvmtiConstantPoolReconstituter; | |
| 655 | |
| 656 private: | |
| 657 jint cpool_entry_size(jint idx); | |
| 658 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap); | |
| 659 | |
| 660 // Copy cpool bytes into byte array. | |
| 661 // Returns: | |
| 662 // int > 0, count of the raw cpool bytes that have been copied | |
| 663 // 0, OutOfMemory error | |
| 664 // -1, Internal error | |
| 665 int copy_cpool_bytes(int cpool_size, | |
| 666 SymbolHashMap* tbl, | |
| 667 unsigned char *bytes); | |
| 668 }; | |
| 669 | |
| 670 class SymbolHashMapEntry : public CHeapObj { | |
| 671 private: | |
| 672 unsigned int _hash; // 32-bit hash for item | |
| 673 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket | |
| 674 symbolOop _symbol; // 1-st part of the mapping: symbol => value | |
| 675 u2 _value; // 2-nd part of the mapping: symbol => value | |
| 676 | |
| 677 public: | |
| 678 unsigned int hash() const { return _hash; } | |
| 679 void set_hash(unsigned int hash) { _hash = hash; } | |
| 680 | |
| 681 SymbolHashMapEntry* next() const { return _next; } | |
| 682 void set_next(SymbolHashMapEntry* next) { _next = next; } | |
| 683 | |
| 684 symbolOop symbol() const { return _symbol; } | |
| 685 void set_symbol(symbolOop sym) { _symbol = sym; } | |
| 686 | |
| 687 u2 value() const { return _value; } | |
| 688 void set_value(u2 value) { _value = value; } | |
| 689 | |
| 690 SymbolHashMapEntry(unsigned int hash, symbolOop symbol, u2 value) | |
| 691 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {} | |
| 692 | |
| 693 }; // End SymbolHashMapEntry class | |
| 694 | |
| 695 | |
| 696 class SymbolHashMapBucket : public CHeapObj { | |
| 697 | |
| 698 private: | |
| 699 SymbolHashMapEntry* _entry; | |
| 700 | |
| 701 public: | |
| 702 SymbolHashMapEntry* entry() const { return _entry; } | |
| 703 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; } | |
| 704 void clear() { _entry = NULL; } | |
| 705 | |
| 706 }; // End SymbolHashMapBucket class | |
| 707 | |
| 708 | |
| 709 class SymbolHashMap: public CHeapObj { | |
| 710 | |
| 711 private: | |
| 712 // Default number of entries in the table | |
| 713 enum SymbolHashMap_Constants { | |
| 714 _Def_HashMap_Size = 256 | |
| 715 }; | |
| 716 | |
| 717 int _table_size; | |
| 718 SymbolHashMapBucket* _buckets; | |
| 719 | |
| 720 void initialize_table(int table_size) { | |
| 721 _table_size = table_size; | |
| 722 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size); | |
| 723 for (int index = 0; index < table_size; index++) { | |
| 724 _buckets[index].clear(); | |
| 725 } | |
| 726 } | |
| 727 | |
| 728 public: | |
| 729 | |
| 730 int table_size() const { return _table_size; } | |
| 731 | |
| 732 SymbolHashMap() { initialize_table(_Def_HashMap_Size); } | |
| 733 SymbolHashMap(int table_size) { initialize_table(table_size); } | |
| 734 | |
| 735 // hash P(31) from Kernighan & Ritchie | |
| 736 static unsigned int compute_hash(const char* str, int len) { | |
| 737 unsigned int hash = 0; | |
| 738 while (len-- > 0) { | |
| 739 hash = 31*hash + (unsigned) *str; | |
| 740 str++; | |
| 741 } | |
| 742 return hash; | |
| 743 } | |
| 744 | |
| 745 SymbolHashMapEntry* bucket(int i) { | |
| 746 return _buckets[i].entry(); | |
| 747 } | |
| 748 | |
| 749 void add_entry(symbolOop sym, u2 value); | |
| 750 SymbolHashMapEntry* find_entry(symbolOop sym); | |
| 751 | |
| 752 u2 symbol_to_value(symbolOop sym) { | |
| 753 SymbolHashMapEntry *entry = find_entry(sym); | |
| 754 return (entry == NULL) ? 0 : entry->value(); | |
| 755 } | |
| 756 | |
| 757 ~SymbolHashMap() { | |
| 758 SymbolHashMapEntry* next; | |
| 759 for (int i = 0; i < _table_size; i++) { | |
| 760 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) { | |
| 761 next = cur->next(); | |
| 762 delete(cur); | |
| 763 } | |
| 764 } | |
| 765 delete _buckets; | |
| 766 } | |
| 767 }; // End SymbolHashMap class |