Fri, 11 Mar 2011 22:34:57 -0800
7012648: move JSR 292 to package java.lang.invoke and adjust names
Summary: package and class renaming only; delete unused methods and classes
Reviewed-by: twisti
duke@435 | 1 | /* |
never@2568 | 2 | * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "ci/ciField.hpp" |
stefank@2314 | 27 | #include "ci/ciInstanceKlass.hpp" |
stefank@2314 | 28 | #include "ci/ciUtilities.hpp" |
stefank@2314 | 29 | #include "classfile/systemDictionary.hpp" |
stefank@2314 | 30 | #include "gc_interface/collectedHeap.inline.hpp" |
stefank@2314 | 31 | #include "interpreter/linkResolver.hpp" |
stefank@2314 | 32 | #include "memory/universe.inline.hpp" |
stefank@2314 | 33 | #include "oops/oop.inline.hpp" |
stefank@2314 | 34 | #include "oops/oop.inline2.hpp" |
stefank@2314 | 35 | #include "runtime/fieldDescriptor.hpp" |
duke@435 | 36 | |
duke@435 | 37 | // ciField |
duke@435 | 38 | // |
duke@435 | 39 | // This class represents the result of a field lookup in the VM. |
duke@435 | 40 | // The lookup may not succeed, in which case the information in |
duke@435 | 41 | // the ciField will be incomplete. |
duke@435 | 42 | |
duke@435 | 43 | // The ciObjectFactory cannot create circular data structures in one query. |
duke@435 | 44 | // To avoid vicious circularities, we initialize ciField::_type to NULL |
duke@435 | 45 | // for reference types and derive it lazily from the ciField::_signature. |
duke@435 | 46 | // Primitive types are eagerly initialized, and basic layout queries |
duke@435 | 47 | // can succeed without initialization, using only the BasicType of the field. |
duke@435 | 48 | |
duke@435 | 49 | // Notes on bootstrapping and shared CI objects: A field is shared if and |
duke@435 | 50 | // only if it is (a) non-static and (b) declared by a shared instance klass. |
duke@435 | 51 | // This allows non-static field lists to be cached on shared types. |
duke@435 | 52 | // Because the _type field is lazily initialized, however, there is a |
duke@435 | 53 | // special restriction that a shared field cannot cache an unshared type. |
duke@435 | 54 | // This puts a small performance penalty on shared fields with unshared |
duke@435 | 55 | // types, such as StackTraceElement[] Throwable.stackTrace. |
duke@435 | 56 | // (Throwable is shared because ClassCastException is shared, but |
duke@435 | 57 | // StackTraceElement is not presently shared.) |
duke@435 | 58 | |
duke@435 | 59 | // It is not a vicious circularity for a ciField to recursively create |
duke@435 | 60 | // the ciSymbols necessary to represent its name and signature. |
duke@435 | 61 | // Therefore, these items are created eagerly, and the name and signature |
duke@435 | 62 | // of a shared field are themselves shared symbols. This somewhat |
duke@435 | 63 | // pollutes the set of shared CI objects: It grows from 50 to 93 items, |
duke@435 | 64 | // with all of the additional 43 being uninteresting shared ciSymbols. |
duke@435 | 65 | // This adds at most one step to the binary search, an amount which |
duke@435 | 66 | // decreases for complex compilation tasks. |
duke@435 | 67 | |
duke@435 | 68 | // ------------------------------------------------------------------ |
duke@435 | 69 | // ciField::ciField |
duke@435 | 70 | ciField::ciField(ciInstanceKlass* klass, int index): _known_to_link_with(NULL) { |
duke@435 | 71 | ASSERT_IN_VM; |
duke@435 | 72 | CompilerThread *thread = CompilerThread::current(); |
duke@435 | 73 | |
duke@435 | 74 | assert(ciObjectFactory::is_initialized(), "not a shared field"); |
duke@435 | 75 | |
duke@435 | 76 | assert(klass->get_instanceKlass()->is_linked(), "must be linked before using its constan-pool"); |
duke@435 | 77 | |
duke@435 | 78 | _cp_index = index; |
duke@435 | 79 | constantPoolHandle cpool(thread, klass->get_instanceKlass()->constants()); |
duke@435 | 80 | |
duke@435 | 81 | // Get the field's name, signature, and type. |
coleenp@2497 | 82 | Symbol* name = cpool->name_ref_at(index); |
coleenp@2497 | 83 | _name = ciEnv::current(thread)->get_symbol(name); |
duke@435 | 84 | |
duke@435 | 85 | int nt_index = cpool->name_and_type_ref_index_at(index); |
duke@435 | 86 | int sig_index = cpool->signature_ref_index_at(nt_index); |
coleenp@2497 | 87 | Symbol* signature = cpool->symbol_at(sig_index); |
coleenp@2497 | 88 | _signature = ciEnv::current(thread)->get_symbol(signature); |
duke@435 | 89 | |
coleenp@2497 | 90 | BasicType field_type = FieldType::basic_type(signature); |
duke@435 | 91 | |
duke@435 | 92 | // If the field is a pointer type, get the klass of the |
duke@435 | 93 | // field. |
duke@435 | 94 | if (field_type == T_OBJECT || field_type == T_ARRAY) { |
duke@435 | 95 | bool ignore; |
duke@435 | 96 | // This is not really a class reference; the index always refers to the |
duke@435 | 97 | // field's type signature, as a symbol. Linkage checks do not apply. |
twisti@1573 | 98 | _type = ciEnv::current(thread)->get_klass_by_index(cpool, sig_index, ignore, klass); |
duke@435 | 99 | } else { |
duke@435 | 100 | _type = ciType::make(field_type); |
duke@435 | 101 | } |
duke@435 | 102 | |
coleenp@2497 | 103 | _name = (ciSymbol*)ciEnv::current(thread)->get_symbol(name); |
duke@435 | 104 | |
duke@435 | 105 | // Get the field's declared holder. |
duke@435 | 106 | // |
duke@435 | 107 | // Note: we actually create a ciInstanceKlass for this klass, |
duke@435 | 108 | // even though we may not need to. |
duke@435 | 109 | int holder_index = cpool->klass_ref_index_at(index); |
duke@435 | 110 | bool holder_is_accessible; |
duke@435 | 111 | ciInstanceKlass* declared_holder = |
twisti@1573 | 112 | ciEnv::current(thread)->get_klass_by_index(cpool, holder_index, |
twisti@1573 | 113 | holder_is_accessible, |
twisti@1573 | 114 | klass)->as_instance_klass(); |
duke@435 | 115 | |
duke@435 | 116 | // The declared holder of this field may not have been loaded. |
duke@435 | 117 | // Bail out with partial field information. |
duke@435 | 118 | if (!holder_is_accessible) { |
duke@435 | 119 | // _cp_index and _type have already been set. |
duke@435 | 120 | // The default values for _flags and _constant_value will suffice. |
duke@435 | 121 | // We need values for _holder, _offset, and _is_constant, |
duke@435 | 122 | _holder = declared_holder; |
duke@435 | 123 | _offset = -1; |
duke@435 | 124 | _is_constant = false; |
duke@435 | 125 | return; |
duke@435 | 126 | } |
duke@435 | 127 | |
duke@435 | 128 | instanceKlass* loaded_decl_holder = declared_holder->get_instanceKlass(); |
duke@435 | 129 | |
duke@435 | 130 | // Perform the field lookup. |
duke@435 | 131 | fieldDescriptor field_desc; |
duke@435 | 132 | klassOop canonical_holder = |
coleenp@2497 | 133 | loaded_decl_holder->find_field(name, signature, &field_desc); |
duke@435 | 134 | if (canonical_holder == NULL) { |
duke@435 | 135 | // Field lookup failed. Will be detected by will_link. |
duke@435 | 136 | _holder = declared_holder; |
duke@435 | 137 | _offset = -1; |
duke@435 | 138 | _is_constant = false; |
duke@435 | 139 | return; |
duke@435 | 140 | } |
duke@435 | 141 | |
duke@435 | 142 | assert(canonical_holder == field_desc.field_holder(), "just checking"); |
duke@435 | 143 | initialize_from(&field_desc); |
duke@435 | 144 | } |
duke@435 | 145 | |
duke@435 | 146 | ciField::ciField(fieldDescriptor *fd): _known_to_link_with(NULL) { |
duke@435 | 147 | ASSERT_IN_VM; |
duke@435 | 148 | |
duke@435 | 149 | _cp_index = -1; |
duke@435 | 150 | |
duke@435 | 151 | // Get the field's name, signature, and type. |
duke@435 | 152 | ciEnv* env = CURRENT_ENV; |
coleenp@2497 | 153 | _name = env->get_symbol(fd->name()); |
coleenp@2497 | 154 | _signature = env->get_symbol(fd->signature()); |
duke@435 | 155 | |
duke@435 | 156 | BasicType field_type = fd->field_type(); |
duke@435 | 157 | |
duke@435 | 158 | // If the field is a pointer type, get the klass of the |
duke@435 | 159 | // field. |
duke@435 | 160 | if (field_type == T_OBJECT || field_type == T_ARRAY) { |
duke@435 | 161 | _type = NULL; // must call compute_type on first access |
duke@435 | 162 | } else { |
duke@435 | 163 | _type = ciType::make(field_type); |
duke@435 | 164 | } |
duke@435 | 165 | |
duke@435 | 166 | initialize_from(fd); |
duke@435 | 167 | |
duke@435 | 168 | // Either (a) it is marked shared, or else (b) we are done bootstrapping. |
duke@435 | 169 | assert(is_shared() || ciObjectFactory::is_initialized(), |
duke@435 | 170 | "bootstrap classes must not create & cache unshared fields"); |
duke@435 | 171 | } |
duke@435 | 172 | |
jrose@1608 | 173 | static bool trust_final_non_static_fields(ciInstanceKlass* holder) { |
jrose@1608 | 174 | if (holder == NULL) |
jrose@1608 | 175 | return false; |
jrose@1608 | 176 | if (holder->name() == ciSymbol::java_lang_System()) |
jrose@1608 | 177 | // Never trust strangely unstable finals: System.out, etc. |
jrose@1608 | 178 | return false; |
jrose@1608 | 179 | // Even if general trusting is disabled, trust system-built closures in these packages. |
jrose@2639 | 180 | if (holder->is_in_package("java/lang/invoke") || holder->is_in_package("sun/invoke")) |
jrose@1608 | 181 | return true; |
jrose@1608 | 182 | return TrustFinalNonStaticFields; |
jrose@1608 | 183 | } |
jrose@1608 | 184 | |
duke@435 | 185 | void ciField::initialize_from(fieldDescriptor* fd) { |
duke@435 | 186 | // Get the flags, offset, and canonical holder of the field. |
duke@435 | 187 | _flags = ciFlags(fd->access_flags()); |
duke@435 | 188 | _offset = fd->offset(); |
duke@435 | 189 | _holder = CURRENT_ENV->get_object(fd->field_holder())->as_instance_klass(); |
duke@435 | 190 | |
duke@435 | 191 | // Check to see if the field is constant. |
twisti@1573 | 192 | if (_holder->is_initialized() && this->is_final()) { |
twisti@1573 | 193 | if (!this->is_static()) { |
jrose@2639 | 194 | // A field can be constant if it's a final static field or if |
jrose@2639 | 195 | // it's a final non-static field of a trusted class (classes in |
jrose@2639 | 196 | // java.lang.invoke and sun.invoke packages and subpackages). |
jrose@1608 | 197 | if (trust_final_non_static_fields(_holder)) { |
twisti@1573 | 198 | _is_constant = true; |
twisti@1573 | 199 | return; |
twisti@1573 | 200 | } |
twisti@1573 | 201 | _is_constant = false; |
twisti@1573 | 202 | return; |
twisti@1573 | 203 | } |
twisti@1573 | 204 | |
duke@435 | 205 | // This field just may be constant. The only cases where it will |
duke@435 | 206 | // not be constant are: |
duke@435 | 207 | // |
duke@435 | 208 | // 1. The field holds a non-perm-space oop. The field is, strictly |
duke@435 | 209 | // speaking, constant but we cannot embed non-perm-space oops into |
duke@435 | 210 | // generated code. For the time being we need to consider the |
duke@435 | 211 | // field to be not constant. |
duke@435 | 212 | // 2. The field is a *special* static&final field whose value |
duke@435 | 213 | // may change. The three examples are java.lang.System.in, |
duke@435 | 214 | // java.lang.System.out, and java.lang.System.err. |
duke@435 | 215 | |
never@2568 | 216 | Handle k = _holder->get_klassOop(); |
never@1577 | 217 | assert( SystemDictionary::System_klass() != NULL, "Check once per vm"); |
never@2568 | 218 | if( k() == SystemDictionary::System_klass() ) { |
duke@435 | 219 | // Check offsets for case 2: System.in, System.out, or System.err |
duke@435 | 220 | if( _offset == java_lang_System::in_offset_in_bytes() || |
duke@435 | 221 | _offset == java_lang_System::out_offset_in_bytes() || |
duke@435 | 222 | _offset == java_lang_System::err_offset_in_bytes() ) { |
duke@435 | 223 | _is_constant = false; |
duke@435 | 224 | return; |
duke@435 | 225 | } |
duke@435 | 226 | } |
duke@435 | 227 | |
duke@435 | 228 | _is_constant = true; |
duke@435 | 229 | switch(type()->basic_type()) { |
duke@435 | 230 | case T_BYTE: |
duke@435 | 231 | _constant_value = ciConstant(type()->basic_type(), k->byte_field(_offset)); |
duke@435 | 232 | break; |
duke@435 | 233 | case T_CHAR: |
duke@435 | 234 | _constant_value = ciConstant(type()->basic_type(), k->char_field(_offset)); |
duke@435 | 235 | break; |
duke@435 | 236 | case T_SHORT: |
duke@435 | 237 | _constant_value = ciConstant(type()->basic_type(), k->short_field(_offset)); |
duke@435 | 238 | break; |
duke@435 | 239 | case T_BOOLEAN: |
duke@435 | 240 | _constant_value = ciConstant(type()->basic_type(), k->bool_field(_offset)); |
duke@435 | 241 | break; |
duke@435 | 242 | case T_INT: |
duke@435 | 243 | _constant_value = ciConstant(type()->basic_type(), k->int_field(_offset)); |
duke@435 | 244 | break; |
duke@435 | 245 | case T_FLOAT: |
duke@435 | 246 | _constant_value = ciConstant(k->float_field(_offset)); |
duke@435 | 247 | break; |
duke@435 | 248 | case T_DOUBLE: |
duke@435 | 249 | _constant_value = ciConstant(k->double_field(_offset)); |
duke@435 | 250 | break; |
duke@435 | 251 | case T_LONG: |
duke@435 | 252 | _constant_value = ciConstant(k->long_field(_offset)); |
duke@435 | 253 | break; |
duke@435 | 254 | case T_OBJECT: |
duke@435 | 255 | case T_ARRAY: |
duke@435 | 256 | { |
duke@435 | 257 | oop o = k->obj_field(_offset); |
duke@435 | 258 | |
duke@435 | 259 | // A field will be "constant" if it is known always to be |
duke@435 | 260 | // a non-null reference to an instance of a particular class, |
duke@435 | 261 | // or to a particular array. This can happen even if the instance |
duke@435 | 262 | // or array is not perm. In such a case, an "unloaded" ciArray |
duke@435 | 263 | // or ciInstance is created. The compiler may be able to use |
duke@435 | 264 | // information about the object's class (which is exact) or length. |
duke@435 | 265 | |
duke@435 | 266 | if (o == NULL) { |
duke@435 | 267 | _constant_value = ciConstant(type()->basic_type(), ciNullObject::make()); |
duke@435 | 268 | } else { |
duke@435 | 269 | _constant_value = ciConstant(type()->basic_type(), CURRENT_ENV->get_object(o)); |
duke@435 | 270 | assert(_constant_value.as_object() == CURRENT_ENV->get_object(o), "check interning"); |
duke@435 | 271 | } |
duke@435 | 272 | } |
duke@435 | 273 | } |
duke@435 | 274 | } else { |
duke@435 | 275 | _is_constant = false; |
duke@435 | 276 | } |
duke@435 | 277 | } |
duke@435 | 278 | |
duke@435 | 279 | // ------------------------------------------------------------------ |
duke@435 | 280 | // ciField::compute_type |
duke@435 | 281 | // |
duke@435 | 282 | // Lazily compute the type, if it is an instance klass. |
duke@435 | 283 | ciType* ciField::compute_type() { |
duke@435 | 284 | GUARDED_VM_ENTRY(return compute_type_impl();) |
duke@435 | 285 | } |
duke@435 | 286 | |
duke@435 | 287 | ciType* ciField::compute_type_impl() { |
duke@435 | 288 | ciKlass* type = CURRENT_ENV->get_klass_by_name_impl(_holder, _signature, false); |
duke@435 | 289 | if (!type->is_primitive_type() && is_shared()) { |
duke@435 | 290 | // We must not cache a pointer to an unshared type, in a shared field. |
duke@435 | 291 | bool type_is_also_shared = false; |
duke@435 | 292 | if (type->is_type_array_klass()) { |
duke@435 | 293 | type_is_also_shared = true; // int[] etc. are explicitly bootstrapped |
duke@435 | 294 | } else if (type->is_instance_klass()) { |
duke@435 | 295 | type_is_also_shared = type->as_instance_klass()->is_shared(); |
duke@435 | 296 | } else { |
duke@435 | 297 | // Currently there is no 'shared' query for array types. |
duke@435 | 298 | type_is_also_shared = !ciObjectFactory::is_initialized(); |
duke@435 | 299 | } |
duke@435 | 300 | if (!type_is_also_shared) |
duke@435 | 301 | return type; // Bummer. |
duke@435 | 302 | } |
duke@435 | 303 | _type = type; |
duke@435 | 304 | return type; |
duke@435 | 305 | } |
duke@435 | 306 | |
duke@435 | 307 | |
duke@435 | 308 | // ------------------------------------------------------------------ |
duke@435 | 309 | // ciField::will_link |
duke@435 | 310 | // |
duke@435 | 311 | // Can a specific access to this field be made without causing |
duke@435 | 312 | // link errors? |
duke@435 | 313 | bool ciField::will_link(ciInstanceKlass* accessing_klass, |
duke@435 | 314 | Bytecodes::Code bc) { |
duke@435 | 315 | VM_ENTRY_MARK; |
duke@435 | 316 | if (_offset == -1) { |
duke@435 | 317 | // at creation we couldn't link to our holder so we need to |
duke@435 | 318 | // maintain that stance, otherwise there's no safe way to use this |
duke@435 | 319 | // ciField. |
duke@435 | 320 | return false; |
duke@435 | 321 | } |
duke@435 | 322 | |
duke@435 | 323 | if (_known_to_link_with == accessing_klass) { |
duke@435 | 324 | return true; |
duke@435 | 325 | } |
duke@435 | 326 | |
duke@435 | 327 | FieldAccessInfo result; |
duke@435 | 328 | constantPoolHandle c_pool(THREAD, |
duke@435 | 329 | accessing_klass->get_instanceKlass()->constants()); |
duke@435 | 330 | LinkResolver::resolve_field(result, c_pool, _cp_index, |
duke@435 | 331 | Bytecodes::java_code(bc), |
duke@435 | 332 | true, false, KILL_COMPILE_ON_FATAL_(false)); |
duke@435 | 333 | |
duke@435 | 334 | // update the hit-cache, unless there is a problem with memory scoping: |
duke@435 | 335 | if (accessing_klass->is_shared() || !is_shared()) |
duke@435 | 336 | _known_to_link_with = accessing_klass; |
duke@435 | 337 | |
duke@435 | 338 | return true; |
duke@435 | 339 | } |
duke@435 | 340 | |
duke@435 | 341 | // ------------------------------------------------------------------ |
duke@435 | 342 | // ciField::print |
duke@435 | 343 | void ciField::print() { |
duke@435 | 344 | tty->print("<ciField "); |
duke@435 | 345 | _holder->print_name(); |
duke@435 | 346 | tty->print("."); |
duke@435 | 347 | _name->print_symbol(); |
duke@435 | 348 | tty->print(" offset=%d type=", _offset); |
duke@435 | 349 | if (_type != NULL) _type->print_name(); |
duke@435 | 350 | else tty->print("(reference)"); |
duke@435 | 351 | tty->print(" is_constant=%s", bool_to_str(_is_constant)); |
kvn@2037 | 352 | if (_is_constant && is_static()) { |
duke@435 | 353 | tty->print(" constant_value="); |
duke@435 | 354 | _constant_value.print(); |
duke@435 | 355 | } |
duke@435 | 356 | tty->print(">"); |
duke@435 | 357 | } |
duke@435 | 358 | |
duke@435 | 359 | // ------------------------------------------------------------------ |
duke@435 | 360 | // ciField::print_name_on |
duke@435 | 361 | // |
duke@435 | 362 | // Print the name of this field |
duke@435 | 363 | void ciField::print_name_on(outputStream* st) { |
duke@435 | 364 | name()->print_symbol_on(st); |
duke@435 | 365 | } |