1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/oops/symbolKlass.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,232 @@
1.4 +/*
1.5 + * Copyright 1997-2006 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/_symbolKlass.cpp.incl"
1.30 +
1.31 +symbolOop symbolKlass::allocate_symbol(u1* name, int len, TRAPS) {
1.32 + // Don't allow symbol oops to be created which cannot fit in a symbolOop.
1.33 + if (len > symbolOopDesc::max_length()) {
1.34 + THROW_MSG_0(vmSymbols::java_lang_InternalError(),
1.35 + "name is too long to represent");
1.36 + }
1.37 + int size = symbolOopDesc::object_size(len);
1.38 + symbolKlassHandle h_k(THREAD, as_klassOop());
1.39 + symbolOop sym = (symbolOop)
1.40 + CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL);
1.41 + assert(!sym->is_parsable(), "not expecting parsability yet.");
1.42 + No_Safepoint_Verifier no_safepoint;
1.43 + sym->set_utf8_length(len);
1.44 + for (int i = 0; i < len; i++) {
1.45 + sym->byte_at_put(i, name[i]);
1.46 + }
1.47 + // Let the first emptySymbol be created and
1.48 + // ensure only one is ever created.
1.49 + assert(sym->is_parsable() || Universe::emptySymbol() == NULL,
1.50 + "should be parsable here.");
1.51 + return sym;
1.52 +}
1.53 +
1.54 +bool symbolKlass::allocate_symbols(int names_count, const char** names,
1.55 + int* lengths, symbolOop* sym_oops, TRAPS) {
1.56 + if (UseConcMarkSweepGC || UseParallelGC) {
1.57 + // Concurrent GC needs to mark all the allocated symbol oops after
1.58 + // the remark phase which isn't done below (except the first symbol oop).
1.59 + // So return false which will let the symbols be allocated one by one.
1.60 + // The parallel collector uses an object start array to find the
1.61 + // start of objects on a dirty card. The object start array is not
1.62 + // updated for the start of each symbol so is not precise. During
1.63 + // object array verification this causes a verification failure.
1.64 + // In a product build this causes extra searching for the start of
1.65 + // a symbol. As with the concurrent collector a return of false will
1.66 + // cause each symbol to be allocated separately and in the case
1.67 + // of the parallel collector will cause the object
1.68 + // start array to be updated.
1.69 + return false;
1.70 + }
1.71 +
1.72 + assert(names_count > 0, "can't allocate 0 symbols");
1.73 +
1.74 + int total_size = 0;
1.75 + int i, sizes[SymbolTable::symbol_alloc_batch_size];
1.76 + for (i=0; i<names_count; i++) {
1.77 + int len = lengths[i];
1.78 + if (len > symbolOopDesc::max_length()) {
1.79 + return false;
1.80 + }
1.81 + int sz = symbolOopDesc::object_size(len);
1.82 + sizes[i] = sz * HeapWordSize;
1.83 + total_size += sz;
1.84 + }
1.85 + symbolKlassHandle h_k(THREAD, as_klassOop());
1.86 + HeapWord* base = Universe::heap()->permanent_mem_allocate(total_size);
1.87 + if (base == NULL) {
1.88 + return false;
1.89 + }
1.90 +
1.91 + // CAN'T take any safepoint during the initialization of the symbol oops !
1.92 + No_Safepoint_Verifier nosafepoint;
1.93 +
1.94 + klassOop sk = h_k();
1.95 + int pos = 0;
1.96 + for (i=0; i<names_count; i++) {
1.97 + symbolOop s = (symbolOop) (((char*)base) + pos);
1.98 + s->set_mark(markOopDesc::prototype());
1.99 + s->set_klass(sk);
1.100 + s->set_utf8_length(lengths[i]);
1.101 + const char* name = names[i];
1.102 + for (int j=0; j<lengths[i]; j++) {
1.103 + s->byte_at_put(j, name[j]);
1.104 + }
1.105 +
1.106 + assert(s->is_parsable(), "should be parsable here.");
1.107 +
1.108 + sym_oops[i] = s;
1.109 + pos += sizes[i];
1.110 + }
1.111 + return true;
1.112 +}
1.113 +
1.114 +klassOop symbolKlass::create_klass(TRAPS) {
1.115 + symbolKlass o;
1.116 + KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());
1.117 + KlassHandle k = base_create_klass(h_this_klass, header_size(), o.vtbl_value(), CHECK_NULL);
1.118 + // Make sure size calculation is right
1.119 + assert(k()->size() == align_object_size(header_size()), "wrong size for object");
1.120 +// java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror
1.121 + return k();
1.122 +}
1.123 +
1.124 +int symbolKlass::oop_size(oop obj) const {
1.125 + assert(obj->is_symbol(),"must be a symbol");
1.126 + symbolOop s = symbolOop(obj);
1.127 + int size = s->object_size();
1.128 + return size;
1.129 +}
1.130 +
1.131 +bool symbolKlass::oop_is_parsable(oop obj) const {
1.132 + assert(obj->is_symbol(),"must be a symbol");
1.133 + symbolOop s = symbolOop(obj);
1.134 + return s->object_is_parsable();
1.135 +}
1.136 +
1.137 +void symbolKlass::oop_follow_contents(oop obj) {
1.138 + assert (obj->is_symbol(), "object must be symbol");
1.139 + // Performance tweak: We skip iterating over the klass pointer since we
1.140 + // know that Universe::symbolKlassObj never moves.
1.141 + // Note: do not follow next link here (see SymbolTable::follow_contents)
1.142 +}
1.143 +
1.144 +#ifndef SERIALGC
1.145 +void symbolKlass::oop_follow_contents(ParCompactionManager* cm, oop obj) {
1.146 + assert (obj->is_symbol(), "object must be symbol");
1.147 + // Performance tweak: We skip iterating over the klass pointer since we
1.148 + // know that Universe::symbolKlassObj never moves.
1.149 + // Note: do not follow next link here (see SymbolTable::follow_contents)
1.150 +}
1.151 +#endif // SERIALGC
1.152 +
1.153 +int symbolKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
1.154 + assert(obj->is_symbol(), "object must be symbol");
1.155 + symbolOop s = symbolOop(obj);
1.156 + // Get size before changing pointers.
1.157 + // Don't call size() or oop_size() since that is a virtual call.
1.158 + int size = s->object_size();
1.159 + // Performance tweak: We skip iterating over the klass pointer since we
1.160 + // know that Universe::symbolKlassObj never moves.
1.161 + return size;
1.162 +}
1.163 +
1.164 +
1.165 +int symbolKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
1.166 + assert(obj->is_symbol(), "object must be symbol");
1.167 + symbolOop s = symbolOop(obj);
1.168 + // Get size before changing pointers.
1.169 + // Don't call size() or oop_size() since that is a virtual call.
1.170 + int size = s->object_size();
1.171 + // Performance tweak: We skip iterating over the klass pointer since we
1.172 + // know that Universe::symbolKlassObj never moves.
1.173 + return size;
1.174 +}
1.175 +
1.176 +
1.177 +int symbolKlass::oop_adjust_pointers(oop obj) {
1.178 + assert(obj->is_symbol(), "should be symbol");
1.179 + symbolOop s = symbolOop(obj);
1.180 + // Get size before changing pointers.
1.181 + // Don't call size() or oop_size() since that is a virtual call.
1.182 + int size = s->object_size();
1.183 + // Performance tweak: We skip iterating over the klass pointer since we
1.184 + // know that Universe::symbolKlassObj never moves.
1.185 + return size;
1.186 +}
1.187 +
1.188 +
1.189 +#ifndef SERIALGC
1.190 +void symbolKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) {
1.191 + assert(obj->is_symbol(), "should be symbol");
1.192 +}
1.193 +
1.194 +void symbolKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
1.195 + assert(obj->is_symbol(), "should be symbol");
1.196 +}
1.197 +
1.198 +int symbolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
1.199 + assert(obj->is_symbol(), "should be symbol");
1.200 + return symbolOop(obj)->object_size();
1.201 +}
1.202 +
1.203 +int symbolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,
1.204 + HeapWord* beg_addr, HeapWord* end_addr) {
1.205 + assert(obj->is_symbol(), "should be symbol");
1.206 + return symbolOop(obj)->object_size();
1.207 +}
1.208 +#endif // SERIALGC
1.209 +
1.210 +#ifndef PRODUCT
1.211 +// Printing
1.212 +
1.213 +void symbolKlass::oop_print_on(oop obj, outputStream* st) {
1.214 + st->print("Symbol: '");
1.215 + symbolOop sym = symbolOop(obj);
1.216 + for (int i = 0; i < sym->utf8_length(); i++) {
1.217 + st->print("%c", sym->byte_at(i));
1.218 + }
1.219 + st->print("'");
1.220 +}
1.221 +
1.222 +void symbolKlass::oop_print_value_on(oop obj, outputStream* st) {
1.223 + symbolOop sym = symbolOop(obj);
1.224 + st->print("'");
1.225 + for (int i = 0; i < sym->utf8_length(); i++) {
1.226 + st->print("%c", sym->byte_at(i));
1.227 + }
1.228 + st->print("'");
1.229 +}
1.230 +
1.231 +#endif //PRODUCT
1.232 +
1.233 +const char* symbolKlass::internal_name() const {
1.234 + return "{symbol}";
1.235 +}
