1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/ci/ciInstanceKlass.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,517 @@
1.4 +/*
1.5 + * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "incls/_precompiled.incl"
1.29 +#include "incls/_ciInstanceKlass.cpp.incl"
1.30 +
1.31 +// ciInstanceKlass
1.32 +//
1.33 +// This class represents a klassOop in the HotSpot virtual machine
1.34 +// whose Klass part in an instanceKlass.
1.35 +
1.36 +// ------------------------------------------------------------------
1.37 +// ciInstanceKlass::ciInstanceKlass
1.38 +//
1.39 +// Loaded instance klass.
1.40 +ciInstanceKlass::ciInstanceKlass(KlassHandle h_k) : ciKlass(h_k) {
1.41 + assert(get_Klass()->oop_is_instance(), "wrong type");
1.42 + instanceKlass* ik = get_instanceKlass();
1.43 +
1.44 + AccessFlags access_flags = ik->access_flags();
1.45 + _flags = ciFlags(access_flags);
1.46 + _has_finalizer = access_flags.has_finalizer();
1.47 + _has_subklass = ik->subklass() != NULL;
1.48 + _is_initialized = ik->is_initialized();
1.49 + // Next line must follow and use the result of the previous line:
1.50 + _is_linked = _is_initialized || ik->is_linked();
1.51 + _nonstatic_field_size = ik->nonstatic_field_size();
1.52 + _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields:
1.53 +
1.54 + _nof_implementors = ik->nof_implementors();
1.55 + for (int i = 0; i < implementors_limit; i++) {
1.56 + _implementors[i] = NULL; // we will fill these lazily
1.57 + }
1.58 +
1.59 + Thread *thread = Thread::current();
1.60 + if (ciObjectFactory::is_initialized()) {
1.61 + _loader = JNIHandles::make_local(thread, ik->class_loader());
1.62 + _protection_domain = JNIHandles::make_local(thread,
1.63 + ik->protection_domain());
1.64 + _is_shared = false;
1.65 + } else {
1.66 + Handle h_loader(thread, ik->class_loader());
1.67 + Handle h_protection_domain(thread, ik->protection_domain());
1.68 + _loader = JNIHandles::make_global(h_loader);
1.69 + _protection_domain = JNIHandles::make_global(h_protection_domain);
1.70 + _is_shared = true;
1.71 + }
1.72 +
1.73 + // Lazy fields get filled in only upon request.
1.74 + _super = NULL;
1.75 + _java_mirror = NULL;
1.76 +
1.77 + if (is_shared()) {
1.78 + if (h_k() != SystemDictionary::object_klass()) {
1.79 + super();
1.80 + }
1.81 + java_mirror();
1.82 + //compute_nonstatic_fields(); // done outside of constructor
1.83 + }
1.84 +
1.85 + _field_cache = NULL;
1.86 +}
1.87 +
1.88 +// Version for unloaded classes:
1.89 +ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
1.90 + jobject loader, jobject protection_domain)
1.91 + : ciKlass(name, ciInstanceKlassKlass::make())
1.92 +{
1.93 + assert(name->byte_at(0) != '[', "not an instance klass");
1.94 + _is_initialized = false;
1.95 + _is_linked = false;
1.96 + _nonstatic_field_size = -1;
1.97 + _nonstatic_fields = NULL;
1.98 + _nof_implementors = -1;
1.99 + _loader = loader;
1.100 + _protection_domain = protection_domain;
1.101 + _is_shared = false;
1.102 + _super = NULL;
1.103 + _java_mirror = NULL;
1.104 + _field_cache = NULL;
1.105 +}
1.106 +
1.107 +
1.108 +
1.109 +// ------------------------------------------------------------------
1.110 +// ciInstanceKlass::compute_shared_is_initialized
1.111 +bool ciInstanceKlass::compute_shared_is_initialized() {
1.112 + GUARDED_VM_ENTRY(
1.113 + instanceKlass* ik = get_instanceKlass();
1.114 + _is_initialized = ik->is_initialized();
1.115 + return _is_initialized;
1.116 + )
1.117 +}
1.118 +
1.119 +// ------------------------------------------------------------------
1.120 +// ciInstanceKlass::compute_shared_is_linked
1.121 +bool ciInstanceKlass::compute_shared_is_linked() {
1.122 + GUARDED_VM_ENTRY(
1.123 + instanceKlass* ik = get_instanceKlass();
1.124 + _is_linked = ik->is_linked();
1.125 + return _is_linked;
1.126 + )
1.127 +}
1.128 +
1.129 +// ------------------------------------------------------------------
1.130 +// ciInstanceKlass::compute_shared_has_subklass
1.131 +bool ciInstanceKlass::compute_shared_has_subklass() {
1.132 + GUARDED_VM_ENTRY(
1.133 + instanceKlass* ik = get_instanceKlass();
1.134 + _has_subklass = ik->subklass() != NULL;
1.135 + return _has_subklass;
1.136 + )
1.137 +}
1.138 +
1.139 +// ------------------------------------------------------------------
1.140 +// ciInstanceKlass::compute_shared_nof_implementors
1.141 +int ciInstanceKlass::compute_shared_nof_implementors() {
1.142 + // We requery this property, since it is a very old ciObject.
1.143 + GUARDED_VM_ENTRY(
1.144 + instanceKlass* ik = get_instanceKlass();
1.145 + _nof_implementors = ik->nof_implementors();
1.146 + return _nof_implementors;
1.147 + )
1.148 +}
1.149 +
1.150 +// ------------------------------------------------------------------
1.151 +// ciInstanceKlass::loader
1.152 +oop ciInstanceKlass::loader() {
1.153 + ASSERT_IN_VM;
1.154 + return JNIHandles::resolve(_loader);
1.155 +}
1.156 +
1.157 +// ------------------------------------------------------------------
1.158 +// ciInstanceKlass::loader_handle
1.159 +jobject ciInstanceKlass::loader_handle() {
1.160 + return _loader;
1.161 +}
1.162 +
1.163 +// ------------------------------------------------------------------
1.164 +// ciInstanceKlass::protection_domain
1.165 +oop ciInstanceKlass::protection_domain() {
1.166 + ASSERT_IN_VM;
1.167 + return JNIHandles::resolve(_protection_domain);
1.168 +}
1.169 +
1.170 +// ------------------------------------------------------------------
1.171 +// ciInstanceKlass::protection_domain_handle
1.172 +jobject ciInstanceKlass::protection_domain_handle() {
1.173 + return _protection_domain;
1.174 +}
1.175 +
1.176 +// ------------------------------------------------------------------
1.177 +// ciInstanceKlass::field_cache
1.178 +//
1.179 +// Get the field cache associated with this klass.
1.180 +ciConstantPoolCache* ciInstanceKlass::field_cache() {
1.181 + if (is_shared()) {
1.182 + return NULL;
1.183 + }
1.184 + if (_field_cache == NULL) {
1.185 + assert(!is_java_lang_Object(), "Object has no fields");
1.186 + Arena* arena = CURRENT_ENV->arena();
1.187 + _field_cache = new (arena) ciConstantPoolCache(arena, 5);
1.188 + }
1.189 + return _field_cache;
1.190 +}
1.191 +
1.192 +// ------------------------------------------------------------------
1.193 +// ciInstanceKlass::get_canonical_holder
1.194 +//
1.195 +ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
1.196 + #ifdef ASSERT
1.197 + if (!(offset >= 0 && offset < layout_helper())) {
1.198 + tty->print("*** get_canonical_holder(%d) on ", offset);
1.199 + this->print();
1.200 + tty->print_cr(" ***");
1.201 + };
1.202 + assert(offset >= 0 && offset < layout_helper(), "offset must be tame");
1.203 + #endif
1.204 +
1.205 + if (offset < (instanceOopDesc::header_size() * wordSize)) {
1.206 + // All header offsets belong properly to java/lang/Object.
1.207 + return CURRENT_ENV->Object_klass();
1.208 + }
1.209 +
1.210 + ciInstanceKlass* self = this;
1.211 + for (;;) {
1.212 + assert(self->is_loaded(), "must be loaded to have size");
1.213 + ciInstanceKlass* super = self->super();
1.214 + if (super == NULL || !super->contains_field_offset(offset)) {
1.215 + return self;
1.216 + } else {
1.217 + self = super; // return super->get_canonical_holder(offset)
1.218 + }
1.219 + }
1.220 +}
1.221 +
1.222 +// ------------------------------------------------------------------
1.223 +// ciInstanceKlass::is_java_lang_Object
1.224 +//
1.225 +// Is this klass java.lang.Object?
1.226 +bool ciInstanceKlass::is_java_lang_Object() {
1.227 + return equals(CURRENT_ENV->Object_klass());
1.228 +}
1.229 +
1.230 +// ------------------------------------------------------------------
1.231 +// ciInstanceKlass::uses_default_loader
1.232 +bool ciInstanceKlass::uses_default_loader() {
1.233 + VM_ENTRY_MARK;
1.234 + return loader() == NULL;
1.235 +}
1.236 +
1.237 +// ------------------------------------------------------------------
1.238 +// ciInstanceKlass::print_impl
1.239 +//
1.240 +// Implementation of the print method.
1.241 +void ciInstanceKlass::print_impl(outputStream* st) {
1.242 + ciKlass::print_impl(st);
1.243 + GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());)
1.244 + if (is_loaded()) {
1.245 + st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
1.246 + bool_to_str(is_initialized()),
1.247 + bool_to_str(has_finalizer()),
1.248 + bool_to_str(has_subklass()),
1.249 + layout_helper());
1.250 +
1.251 + _flags.print_klass_flags();
1.252 +
1.253 + if (_super) {
1.254 + st->print(" super=");
1.255 + _super->print_name();
1.256 + }
1.257 + if (_java_mirror) {
1.258 + st->print(" mirror=PRESENT");
1.259 + }
1.260 + } else {
1.261 + st->print(" loaded=false");
1.262 + }
1.263 +}
1.264 +
1.265 +// ------------------------------------------------------------------
1.266 +// ciInstanceKlass::super
1.267 +//
1.268 +// Get the superklass of this klass.
1.269 +ciInstanceKlass* ciInstanceKlass::super() {
1.270 + assert(is_loaded(), "must be loaded");
1.271 + if (_super == NULL && !is_java_lang_Object()) {
1.272 + GUARDED_VM_ENTRY(
1.273 + klassOop super_klass = get_instanceKlass()->super();
1.274 + _super = CURRENT_ENV->get_object(super_klass)->as_instance_klass();
1.275 + )
1.276 + }
1.277 + return _super;
1.278 +}
1.279 +
1.280 +// ------------------------------------------------------------------
1.281 +// ciInstanceKlass::java_mirror
1.282 +//
1.283 +// Get the instance of java.lang.Class corresponding to this klass.
1.284 +ciInstance* ciInstanceKlass::java_mirror() {
1.285 + assert(is_loaded(), "must be loaded");
1.286 + if (_java_mirror == NULL) {
1.287 + _java_mirror = ciKlass::java_mirror();
1.288 + }
1.289 + return _java_mirror;
1.290 +}
1.291 +
1.292 +// ------------------------------------------------------------------
1.293 +// ciInstanceKlass::unique_concrete_subklass
1.294 +ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
1.295 + if (!is_loaded()) return NULL; // No change if class is not loaded
1.296 + if (!is_abstract()) return NULL; // Only applies to abstract classes.
1.297 + if (!has_subklass()) return NULL; // Must have at least one subklass.
1.298 + VM_ENTRY_MARK;
1.299 + instanceKlass* ik = get_instanceKlass();
1.300 + Klass* up = ik->up_cast_abstract();
1.301 + assert(up->oop_is_instance(), "must be instanceKlass");
1.302 + if (ik == up) {
1.303 + return NULL;
1.304 + }
1.305 + return CURRENT_THREAD_ENV->get_object(up->as_klassOop())->as_instance_klass();
1.306 +}
1.307 +
1.308 +// ------------------------------------------------------------------
1.309 +// ciInstanceKlass::has_finalizable_subclass
1.310 +bool ciInstanceKlass::has_finalizable_subclass() {
1.311 + if (!is_loaded()) return true;
1.312 + VM_ENTRY_MARK;
1.313 + return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
1.314 +}
1.315 +
1.316 +// ------------------------------------------------------------------
1.317 +// ciInstanceKlass::get_field_by_offset
1.318 +ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
1.319 + if (!is_static) {
1.320 + for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
1.321 + ciField* field = _nonstatic_fields->at(i);
1.322 + int field_off = field->offset_in_bytes();
1.323 + if (field_off == field_offset)
1.324 + return field;
1.325 + if (field_off > field_offset)
1.326 + break;
1.327 + // could do binary search or check bins, but probably not worth it
1.328 + }
1.329 + return NULL;
1.330 + }
1.331 + VM_ENTRY_MARK;
1.332 + instanceKlass* k = get_instanceKlass();
1.333 + fieldDescriptor fd;
1.334 + if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
1.335 + return NULL;
1.336 + }
1.337 + ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
1.338 + return field;
1.339 +}
1.340 +
1.341 +static int sort_field_by_offset(ciField** a, ciField** b) {
1.342 + return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
1.343 + // (no worries about 32-bit overflow...)
1.344 +}
1.345 +
1.346 +// ------------------------------------------------------------------
1.347 +// ciInstanceKlass::compute_nonstatic_fields
1.348 +int ciInstanceKlass::compute_nonstatic_fields() {
1.349 + assert(is_loaded(), "must be loaded");
1.350 +
1.351 + if (_nonstatic_fields != NULL)
1.352 + return _nonstatic_fields->length();
1.353 +
1.354 + // Size in bytes of my fields, including inherited fields.
1.355 + // About equal to size_helper() - sizeof(oopDesc).
1.356 + int fsize = nonstatic_field_size() * wordSize;
1.357 + if (fsize == 0) { // easy shortcut
1.358 + Arena* arena = CURRENT_ENV->arena();
1.359 + _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
1.360 + return 0;
1.361 + }
1.362 + assert(!is_java_lang_Object(), "bootstrap OK");
1.363 +
1.364 + ciInstanceKlass* super = this->super();
1.365 + int super_fsize = 0;
1.366 + int super_flen = 0;
1.367 + GrowableArray<ciField*>* super_fields = NULL;
1.368 + if (super != NULL) {
1.369 + super_fsize = super->nonstatic_field_size() * wordSize;
1.370 + super_flen = super->nof_nonstatic_fields();
1.371 + super_fields = super->_nonstatic_fields;
1.372 + assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
1.373 + }
1.374 +
1.375 + // See if I am no larger than my super; if so, I can use his fields.
1.376 + if (fsize == super_fsize) {
1.377 + _nonstatic_fields = super_fields;
1.378 + return super_fields->length();
1.379 + }
1.380 +
1.381 + GrowableArray<ciField*>* fields = NULL;
1.382 + GUARDED_VM_ENTRY({
1.383 + fields = compute_nonstatic_fields_impl(super_fields);
1.384 + });
1.385 +
1.386 + if (fields == NULL) {
1.387 + // This can happen if this class (java.lang.Class) has invisible fields.
1.388 + _nonstatic_fields = super_fields;
1.389 + return super_fields->length();
1.390 + }
1.391 +
1.392 + int flen = fields->length();
1.393 +
1.394 + // Now sort them by offset, ascending.
1.395 + // (In principle, they could mix with superclass fields.)
1.396 + fields->sort(sort_field_by_offset);
1.397 +#ifdef ASSERT
1.398 + int last_offset = sizeof(oopDesc);
1.399 + for (int i = 0; i < fields->length(); i++) {
1.400 + ciField* field = fields->at(i);
1.401 + int offset = field->offset_in_bytes();
1.402 + int size = (field->_type == NULL) ? oopSize : field->size_in_bytes();
1.403 + assert(last_offset <= offset, "no field overlap");
1.404 + if (last_offset > (int)sizeof(oopDesc))
1.405 + assert((offset - last_offset) < BytesPerLong, "no big holes");
1.406 + // Note: Two consecutive T_BYTE fields will be separated by wordSize-1
1.407 + // padding bytes if one of them is declared by a superclass.
1.408 + // This is a minor inefficiency classFileParser.cpp.
1.409 + last_offset = offset + size;
1.410 + }
1.411 + assert(last_offset <= (int)sizeof(oopDesc) + fsize, "no overflow");
1.412 +#endif
1.413 +
1.414 + _nonstatic_fields = fields;
1.415 + return flen;
1.416 +}
1.417 +
1.418 +GrowableArray<ciField*>*
1.419 +ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>*
1.420 + super_fields) {
1.421 + ASSERT_IN_VM;
1.422 + Arena* arena = CURRENT_ENV->arena();
1.423 + int flen = 0;
1.424 + GrowableArray<ciField*>* fields = NULL;
1.425 + instanceKlass* k = get_instanceKlass();
1.426 + typeArrayOop fields_array = k->fields();
1.427 + for (int pass = 0; pass <= 1; pass++) {
1.428 + for (int i = 0, alen = fields_array->length(); i < alen; i += instanceKlass::next_offset) {
1.429 + fieldDescriptor fd;
1.430 + fd.initialize(k->as_klassOop(), i);
1.431 + if (fd.is_static()) continue;
1.432 + if (pass == 0) {
1.433 + flen += 1;
1.434 + } else {
1.435 + ciField* field = new (arena) ciField(&fd);
1.436 + fields->append(field);
1.437 + }
1.438 + }
1.439 +
1.440 + // Between passes, allocate the array:
1.441 + if (pass == 0) {
1.442 + if (flen == 0) {
1.443 + return NULL; // return nothing if none are locally declared
1.444 + }
1.445 + if (super_fields != NULL) {
1.446 + flen += super_fields->length();
1.447 + }
1.448 + fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
1.449 + if (super_fields != NULL) {
1.450 + fields->appendAll(super_fields);
1.451 + }
1.452 + }
1.453 + }
1.454 + assert(fields->length() == flen, "sanity");
1.455 + return fields;
1.456 +}
1.457 +
1.458 +// ------------------------------------------------------------------
1.459 +// ciInstanceKlass::find_method
1.460 +//
1.461 +// Find a method in this klass.
1.462 +ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
1.463 + VM_ENTRY_MARK;
1.464 + instanceKlass* k = get_instanceKlass();
1.465 + symbolOop name_sym = name->get_symbolOop();
1.466 + symbolOop sig_sym= signature->get_symbolOop();
1.467 +
1.468 + methodOop m = k->find_method(name_sym, sig_sym);
1.469 + if (m == NULL) return NULL;
1.470 +
1.471 + return CURRENT_THREAD_ENV->get_object(m)->as_method();
1.472 +}
1.473 +
1.474 +// ------------------------------------------------------------------
1.475 +// ciInstanceKlass::is_leaf_type
1.476 +bool ciInstanceKlass::is_leaf_type() {
1.477 + assert(is_loaded(), "must be loaded");
1.478 + if (is_shared()) {
1.479 + return is_final(); // approximately correct
1.480 + } else {
1.481 + return !_has_subklass && (_nof_implementors == 0);
1.482 + }
1.483 +}
1.484 +
1.485 +// ------------------------------------------------------------------
1.486 +// ciInstanceKlass::implementor
1.487 +//
1.488 +// Report an implementor of this interface.
1.489 +// Returns NULL if exact information is not available.
1.490 +// Note that there are various races here, since my copy
1.491 +// of _nof_implementors might be out of date with respect
1.492 +// to results returned by instanceKlass::implementor.
1.493 +// This is OK, since any dependencies we decide to assert
1.494 +// will be checked later under the Compile_lock.
1.495 +ciInstanceKlass* ciInstanceKlass::implementor(int n) {
1.496 + if (n > implementors_limit) {
1.497 + return NULL;
1.498 + }
1.499 + ciInstanceKlass* impl = _implementors[n];
1.500 + if (impl == NULL) {
1.501 + if (_nof_implementors > implementors_limit) {
1.502 + return NULL;
1.503 + }
1.504 + // Go into the VM to fetch the implementor.
1.505 + {
1.506 + VM_ENTRY_MARK;
1.507 + klassOop k = get_instanceKlass()->implementor(n);
1.508 + if (k != NULL) {
1.509 + impl = CURRENT_THREAD_ENV->get_object(k)->as_instance_klass();
1.510 + }
1.511 + }
1.512 + // Memoize this result.
1.513 + if (!is_shared()) {
1.514 + _implementors[n] = (impl == NULL)? this: impl;
1.515 + }
1.516 + } else if (impl == this) {
1.517 + impl = NULL; // memoized null result from a VM query
1.518 + }
1.519 + return impl;
1.520 +}
