src/share/vm/oops/constMethodKlass.cpp

Thu, 22 Jul 2010 10:27:41 -0400

author
tonyp
date
Thu, 22 Jul 2010 10:27:41 -0400
changeset 2061
9d7a8ab3736b
parent 1907
c18cbe5936b8
child 2068
7fcd5f39bd7a
permissions
-rw-r--r--

6962589: remove breadth first scanning code from parallel gc
Summary: Remove the breadth-first copying order from ParallelScavenge and use depth-first by default.
Reviewed-by: jcoomes, ysr, johnc

     1 /*
     2  * Copyright (c) 2003, 2009, Oracle and/or its affiliates. All rights reserved.
     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  *
    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    20  * or visit www.oracle.com if you need additional information or have any
    21  * questions.
    22  *
    23  */
    25 # include "incls/_precompiled.incl"
    26 # include "incls/_constMethodKlass.cpp.incl"
    29 klassOop constMethodKlass::create_klass(TRAPS) {
    30   constMethodKlass o;
    31   KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());
    32   KlassHandle k = base_create_klass(h_this_klass, header_size(),
    33                                     o.vtbl_value(), CHECK_NULL);
    34   // Make sure size calculation is right
    35   assert(k()->size() == align_object_size(header_size()),
    36          "wrong size for object");
    37   //java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror
    38   return k();
    39 }
    42 int constMethodKlass::oop_size(oop obj) const {
    43   assert(obj->is_constMethod(), "must be constMethod oop");
    44   return constMethodOop(obj)->object_size();
    45 }
    47 bool constMethodKlass::oop_is_parsable(oop obj) const {
    48   assert(obj->is_constMethod(), "must be constMethod oop");
    49   return constMethodOop(obj)->object_is_parsable();
    50 }
    52 bool constMethodKlass::oop_is_conc_safe(oop obj) const {
    53   assert(obj->is_constMethod(), "must be constMethod oop");
    54   return constMethodOop(obj)->is_conc_safe();
    55 }
    57 constMethodOop constMethodKlass::allocate(int byte_code_size,
    58                                           int compressed_line_number_size,
    59                                           int localvariable_table_length,
    60                                           int checked_exceptions_length,
    61                                           bool is_conc_safe,
    62                                           TRAPS) {
    64   int size = constMethodOopDesc::object_size(byte_code_size,
    65                                              compressed_line_number_size,
    66                                              localvariable_table_length,
    67                                              checked_exceptions_length);
    68   KlassHandle h_k(THREAD, as_klassOop());
    69   constMethodOop cm = (constMethodOop)
    70     CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL);
    71   assert(!cm->is_parsable(), "Not yet safely parsable");
    72   No_Safepoint_Verifier no_safepoint;
    73   cm->set_interpreter_kind(Interpreter::invalid);
    74   cm->init_fingerprint();
    75   cm->set_method(NULL);
    76   cm->set_stackmap_data(NULL);
    77   cm->set_exception_table(NULL);
    78   cm->set_code_size(byte_code_size);
    79   cm->set_constMethod_size(size);
    80   cm->set_inlined_tables_length(checked_exceptions_length,
    81                                 compressed_line_number_size,
    82                                 localvariable_table_length);
    83   assert(cm->size() == size, "wrong size for object");
    84   cm->set_is_conc_safe(is_conc_safe);
    85   cm->set_partially_loaded();
    86   assert(cm->is_parsable(), "Is safely parsable by gc");
    87   return cm;
    88 }
    90 void constMethodKlass::oop_follow_contents(oop obj) {
    91   assert (obj->is_constMethod(), "object must be constMethod");
    92   constMethodOop cm = constMethodOop(obj);
    93   MarkSweep::mark_and_push(cm->adr_method());
    94   MarkSweep::mark_and_push(cm->adr_stackmap_data());
    95   MarkSweep::mark_and_push(cm->adr_exception_table());
    96   // Performance tweak: We skip iterating over the klass pointer since we
    97   // know that Universe::constMethodKlassObj never moves.
    98 }
   100 #ifndef SERIALGC
   101 void constMethodKlass::oop_follow_contents(ParCompactionManager* cm,
   102                                            oop obj) {
   103   assert (obj->is_constMethod(), "object must be constMethod");
   104   constMethodOop cm_oop = constMethodOop(obj);
   105   PSParallelCompact::mark_and_push(cm, cm_oop->adr_method());
   106   PSParallelCompact::mark_and_push(cm, cm_oop->adr_stackmap_data());
   107   PSParallelCompact::mark_and_push(cm, cm_oop->adr_exception_table());
   108   // Performance tweak: We skip iterating over the klass pointer since we
   109   // know that Universe::constMethodKlassObj never moves.
   110 }
   111 #endif // SERIALGC
   113 int constMethodKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
   114   assert (obj->is_constMethod(), "object must be constMethod");
   115   constMethodOop cm = constMethodOop(obj);
   116   blk->do_oop(cm->adr_method());
   117   blk->do_oop(cm->adr_stackmap_data());
   118   blk->do_oop(cm->adr_exception_table());
   119   // Get size before changing pointers.
   120   // Don't call size() or oop_size() since that is a virtual call.
   121   int size = cm->object_size();
   122   return size;
   123 }
   126 int constMethodKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
   127   assert (obj->is_constMethod(), "object must be constMethod");
   128   constMethodOop cm = constMethodOop(obj);
   129   oop* adr;
   130   adr = cm->adr_method();
   131   if (mr.contains(adr)) blk->do_oop(adr);
   132   adr = cm->adr_stackmap_data();
   133   if (mr.contains(adr)) blk->do_oop(adr);
   134   adr = cm->adr_exception_table();
   135   if (mr.contains(adr)) blk->do_oop(adr);
   136   // Get size before changing pointers.
   137   // Don't call size() or oop_size() since that is a virtual call.
   138   int size = cm->object_size();
   139   // Performance tweak: We skip iterating over the klass pointer since we
   140   // know that Universe::constMethodKlassObj never moves.
   141   return size;
   142 }
   145 int constMethodKlass::oop_adjust_pointers(oop obj) {
   146   assert(obj->is_constMethod(), "should be constMethod");
   147   constMethodOop cm = constMethodOop(obj);
   148   MarkSweep::adjust_pointer(cm->adr_method());
   149   MarkSweep::adjust_pointer(cm->adr_stackmap_data());
   150   MarkSweep::adjust_pointer(cm->adr_exception_table());
   151   // Get size before changing pointers.
   152   // Don't call size() or oop_size() since that is a virtual call.
   153   int size = cm->object_size();
   154   // Performance tweak: We skip iterating over the klass pointer since we
   155   // know that Universe::constMethodKlassObj never moves.
   156   return size;
   157 }
   159 #ifndef SERIALGC
   160 void constMethodKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
   161   assert(obj->is_constMethod(), "should be constMethod");
   162 }
   164 int constMethodKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
   165   assert(obj->is_constMethod(), "should be constMethod");
   166   constMethodOop cm_oop = constMethodOop(obj);
   167 #if 0
   168   PSParallelCompact::adjust_pointer(cm_oop->adr_method());
   169   PSParallelCompact::adjust_pointer(cm_oop->adr_exception_table());
   170   PSParallelCompact::adjust_pointer(cm_oop->adr_stackmap_data());
   171 #endif
   172   oop* const beg_oop = cm_oop->oop_block_beg();
   173   oop* const end_oop = cm_oop->oop_block_end();
   174   for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) {
   175     PSParallelCompact::adjust_pointer(cur_oop);
   176   }
   177   return cm_oop->object_size();
   178 }
   180 int constMethodKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,
   181                                           HeapWord* beg_addr,
   182                                           HeapWord* end_addr) {
   183   assert(obj->is_constMethod(), "should be constMethod");
   184   constMethodOop cm_oop = constMethodOop(obj);
   186   oop* const beg_oop = MAX2((oop*)beg_addr, cm_oop->oop_block_beg());
   187   oop* const end_oop = MIN2((oop*)end_addr, cm_oop->oop_block_end());
   188   for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) {
   189     PSParallelCompact::adjust_pointer(cur_oop);
   190   }
   192   return cm_oop->object_size();
   193 }
   194 #endif // SERIALGC
   196 #ifndef PRODUCT
   198 // Printing
   200 void constMethodKlass::oop_print_on(oop obj, outputStream* st) {
   201   ResourceMark rm;
   202   assert(obj->is_constMethod(), "must be constMethod");
   203   Klass::oop_print_on(obj, st);
   204   constMethodOop m = constMethodOop(obj);
   205   st->print(" - method:       " INTPTR_FORMAT " ", (address)m->method());
   206   m->method()->print_value_on(st); st->cr();
   207   st->print(" - exceptions:   " INTPTR_FORMAT "\n", (address)m->exception_table());
   208   if (m->has_stackmap_table()) {
   209     st->print(" - stackmap data:       ");
   210     m->stackmap_data()->print_value_on(st);
   211     st->cr();
   212   }
   213 }
   215 #endif //PRODUCT
   217 // Short version of printing constMethodOop - just print the name of the
   218 // method it belongs to.
   219 void constMethodKlass::oop_print_value_on(oop obj, outputStream* st) {
   220   assert(obj->is_constMethod(), "must be constMethod");
   221   constMethodOop m = constMethodOop(obj);
   222   st->print(" const part of method " );
   223   m->method()->print_value_on(st);
   224 }
   226 const char* constMethodKlass::internal_name() const {
   227   return "{constMethod}";
   228 }
   231 // Verification
   233 void constMethodKlass::oop_verify_on(oop obj, outputStream* st) {
   234   Klass::oop_verify_on(obj, st);
   235   guarantee(obj->is_constMethod(), "object must be constMethod");
   236   constMethodOop m = constMethodOop(obj);
   237   guarantee(m->is_perm(),                            "should be in permspace");
   239   // Verification can occur during oop construction before the method or
   240   // other fields have been initialized.
   241   if (!obj->partially_loaded()) {
   242     guarantee(m->method()->is_perm(), "should be in permspace");
   243     guarantee(m->method()->is_method(), "should be method");
   244     typeArrayOop stackmap_data = m->stackmap_data();
   245     guarantee(stackmap_data == NULL ||
   246               stackmap_data->is_perm(),  "should be in permspace");
   247     guarantee(m->exception_table()->is_perm(), "should be in permspace");
   248     guarantee(m->exception_table()->is_typeArray(), "should be type array");
   250     address m_end = (address)((oop*) m + m->size());
   251     address compressed_table_start = m->code_end();
   252     guarantee(compressed_table_start <= m_end, "invalid method layout");
   253     address compressed_table_end = compressed_table_start;
   254     // Verify line number table
   255     if (m->has_linenumber_table()) {
   256       CompressedLineNumberReadStream stream(m->compressed_linenumber_table());
   257       while (stream.read_pair()) {
   258         guarantee(stream.bci() >= 0 && stream.bci() <= m->code_size(), "invalid bci in line number table");
   259       }
   260       compressed_table_end += stream.position();
   261     }
   262     guarantee(compressed_table_end <= m_end, "invalid method layout");
   263     // Verify checked exceptions and local variable tables
   264     if (m->has_checked_exceptions()) {
   265       u2* addr = m->checked_exceptions_length_addr();
   266       guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
   267     }
   268     if (m->has_localvariable_table()) {
   269       u2* addr = m->localvariable_table_length_addr();
   270       guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
   271     }
   272     // Check compressed_table_end relative to uncompressed_table_start
   273     u2* uncompressed_table_start;
   274     if (m->has_localvariable_table()) {
   275       uncompressed_table_start = (u2*) m->localvariable_table_start();
   276     } else {
   277       if (m->has_checked_exceptions()) {
   278         uncompressed_table_start = (u2*) m->checked_exceptions_start();
   279       } else {
   280         uncompressed_table_start = (u2*) m_end;
   281       }
   282     }
   283     int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
   284     int max_gap = align_object_size(1)*BytesPerWord;
   285     guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
   286   }
   287 }
   289 bool constMethodKlass::oop_partially_loaded(oop obj) const {
   290   assert(obj->is_constMethod(), "object must be klass");
   291   constMethodOop m = constMethodOop(obj);
   292   // check whether exception_table points to self (flag for partially loaded)
   293   return m->exception_table() == (typeArrayOop)obj;
   294 }
   297 // The exception_table is the last field set when loading an object.
   298 void constMethodKlass::oop_set_partially_loaded(oop obj) {
   299   assert(obj->is_constMethod(), "object must be klass");
   300   constMethodOop m = constMethodOop(obj);
   301   // Temporarily set exception_table to point to self
   302   m->set_exception_table((typeArrayOop)obj);
   303 }

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