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 /*

  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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  */

 #include "precompiled.hpp"

 #include "classfile/javaClasses.hpp"

 #include "gc_implementation/shared/markSweep.inline.hpp"

 #include "gc_interface/collectedHeap.inline.hpp"

 #include "memory/oopFactory.hpp"

 #include "memory/permGen.hpp"

 #include "memory/universe.inline.hpp"

 #include "oops/constantPoolKlass.hpp"

 #include "oops/constantPoolOop.hpp"

 #include "oops/oop.inline.hpp"

 #include "oops/oop.inline2.hpp"

 #include "oops/symbol.hpp"

 #include "runtime/handles.inline.hpp"

 #ifdef TARGET_OS_FAMILY_linux

 # include "thread_linux.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_solaris

 # include "thread_solaris.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_windows

 # include "thread_windows.inline.hpp"

 #endif

 #ifndef SERIALGC

 #include "gc_implementation/parNew/parOopClosures.inline.hpp"

 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"

 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"

 #include "memory/cardTableRS.hpp"

 #include "oops/oop.pcgc.inline.hpp"

 #endif

 constantPoolOop constantPoolKlass::allocate(int length, bool is_conc_safe, TRAPS) {

   int size = constantPoolOopDesc::object_size(length);

   KlassHandle klass (THREAD, as_klassOop());

   constantPoolOop c =

     (constantPoolOop)CollectedHeap::permanent_obj_allocate(klass, size, CHECK_NULL);

   c->set_length(length);

   c->set_tags(NULL);

   c->set_cache(NULL);

   c->set_operands(NULL);

   c->set_pool_holder(NULL);

   c->set_flags(0);

   // only set to non-zero if constant pool is merged by RedefineClasses

   c->set_orig_length(0);

   // if constant pool may change during RedefineClasses, it is created

   // unsafe for GC concurrent processing.

   c->set_is_conc_safe(is_conc_safe);

   // all fields are initialized; needed for GC

   // Note: because we may be in this "conc_unsafe" state when allocating

   // t_oop below, which may in turn cause a GC, it is imperative that our

   // size be correct, consistent and henceforth stable, at this stage.

   assert(c->is_parsable(), "Else size() below is unreliable");

   DEBUG_ONLY(int sz = c->size();)

   // initialize tag array

   // Note: cannot introduce constant pool handle before since it is not

   //       completely initialized (no class) -> would cause assertion failure

   constantPoolHandle pool (THREAD, c);

   typeArrayOop t_oop = oopFactory::new_permanent_byteArray(length, CHECK_NULL);

   typeArrayHandle tags (THREAD, t_oop);

   for (int index = 0; index < length; index++) {

     tags()->byte_at_put(index, JVM_CONSTANT_Invalid);

   }

   pool->set_tags(tags());

   // Check that our size was stable at its old value.

   assert(sz == c->size(), "size() changed");

   return pool();

 }

 klassOop constantPoolKlass::create_klass(TRAPS) {

   constantPoolKlass o;

   KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());

   KlassHandle k = base_create_klass(h_this_klass, header_size(), o.vtbl_value(), CHECK_NULL);

   // Make sure size calculation is right

   assert(k()->size() == align_object_size(header_size()), "wrong size for object");

   java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror

   return k();

 }

 int constantPoolKlass::oop_size(oop obj) const {

   assert(obj->is_constantPool(), "must be constantPool");

   return constantPoolOop(obj)->object_size();

 }

 void constantPoolKlass::oop_follow_contents(oop obj) {

   assert (obj->is_constantPool(), "obj must be constant pool");

   constantPoolOop cp = (constantPoolOop) obj;

   // Performance tweak: We skip iterating over the klass pointer since we

   // know that Universe::constantPoolKlassObj never moves.

   // If the tags array is null we are in the middle of allocating this constant pool

   if (cp->tags() != NULL) {

     // gc of constant pool contents

     oop* base = (oop*)cp->base();

     for (int i = 0; i < cp->length(); i++) {

       if (cp->is_pointer_entry(i)) {

         if (*base != NULL) MarkSweep::mark_and_push(base);

       }

       base++;

     }

     // gc of constant pool instance variables

     MarkSweep::mark_and_push(cp->tags_addr());

     MarkSweep::mark_and_push(cp->cache_addr());

     MarkSweep::mark_and_push(cp->operands_addr());

     MarkSweep::mark_and_push(cp->pool_holder_addr());

   }

 }

 #ifndef SERIALGC

 void constantPoolKlass::oop_follow_contents(ParCompactionManager* cm,

                                             oop obj) {

   assert (obj->is_constantPool(), "obj must be constant pool");

   constantPoolOop cp = (constantPoolOop) obj;

   // Performance tweak: We skip iterating over the klass pointer since we

   // know that Universe::constantPoolKlassObj never moves.

   // If the tags array is null we are in the middle of allocating this constant

   // pool.

   if (cp->tags() != NULL) {

     // gc of constant pool contents

     oop* base = (oop*)cp->base();

     for (int i = 0; i < cp->length(); i++) {

       if (cp->is_pointer_entry(i)) {

         if (*base != NULL) PSParallelCompact::mark_and_push(cm, base);

       }

       base++;

     }

     // gc of constant pool instance variables

     PSParallelCompact::mark_and_push(cm, cp->tags_addr());

     PSParallelCompact::mark_and_push(cm, cp->cache_addr());

     PSParallelCompact::mark_and_push(cm, cp->operands_addr());

     PSParallelCompact::mark_and_push(cm, cp->pool_holder_addr());

   }

 }

 #endif // SERIALGC

 int constantPoolKlass::oop_adjust_pointers(oop obj) {

   assert (obj->is_constantPool(), "obj must be constant pool");

   constantPoolOop cp = (constantPoolOop) obj;

   // Get size before changing pointers.

   // Don't call size() or oop_size() since that is a virtual call.

   int size = cp->object_size();

   // Performance tweak: We skip iterating over the klass pointer since we

   // know that Universe::constantPoolKlassObj never moves.

   // If the tags array is null we are in the middle of allocating this constant

   // pool.

   if (cp->tags() != NULL) {

     oop* base = (oop*)cp->base();

     for (int i = 0; i< cp->length();  i++) {

       if (cp->is_pointer_entry(i)) {

         MarkSweep::adjust_pointer(base);

       }

       base++;

     }

   }

   MarkSweep::adjust_pointer(cp->tags_addr());

   MarkSweep::adjust_pointer(cp->cache_addr());

   MarkSweep::adjust_pointer(cp->operands_addr());

   MarkSweep::adjust_pointer(cp->pool_holder_addr());

   return size;

 }

 int constantPoolKlass::oop_oop_iterate(oop obj, OopClosure* blk) {

   assert (obj->is_constantPool(), "obj must be constant pool");

   // Performance tweak: We skip iterating over the klass pointer since we

   // know that Universe::constantPoolKlassObj never moves.

   constantPoolOop cp = (constantPoolOop) obj;

   // Get size before changing pointers.

   // Don't call size() or oop_size() since that is a virtual call.

   int size = cp->object_size();

   // If the tags array is null we are in the middle of allocating this constant

   // pool.

   if (cp->tags() != NULL) {

     oop* base = (oop*)cp->base();

     for (int i = 0; i < cp->length(); i++) {

       if (cp->is_pointer_entry(i)) {

         blk->do_oop(base);

       }

       base++;

     }

   }

   blk->do_oop(cp->tags_addr());

   blk->do_oop(cp->cache_addr());

   blk->do_oop(cp->operands_addr());

   blk->do_oop(cp->pool_holder_addr());

   return size;

 }

 int constantPoolKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {

   assert (obj->is_constantPool(), "obj must be constant pool");

   // Performance tweak: We skip iterating over the klass pointer since we

   // know that Universe::constantPoolKlassObj never moves.

   constantPoolOop cp = (constantPoolOop) obj;

   // Get size before changing pointers.

   // Don't call size() or oop_size() since that is a virtual call.

   int size = cp->object_size();

   // If the tags array is null we are in the middle of allocating this constant

   // pool.

   if (cp->tags() != NULL) {

     oop* base = (oop*)cp->base();

     for (int i = 0; i < cp->length(); i++) {

       if (mr.contains(base)) {

         if (cp->is_pointer_entry(i)) {

           blk->do_oop(base);

         }

       }

       base++;

     }

   }

   oop* addr;

   addr = cp->tags_addr();

   blk->do_oop(addr);

   addr = cp->cache_addr();

   blk->do_oop(addr);

   addr = cp->operands_addr();

   blk->do_oop(addr);

   addr = cp->pool_holder_addr();

   blk->do_oop(addr);

   return size;

 }

 bool constantPoolKlass::oop_is_conc_safe(oop obj) const {

   assert(obj->is_constantPool(), "must be constantPool");

   return constantPoolOop(obj)->is_conc_safe();

 }

 #ifndef SERIALGC

 int constantPoolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {

   assert (obj->is_constantPool(), "obj must be constant pool");

   constantPoolOop cp = (constantPoolOop) obj;

   // If the tags array is null we are in the middle of allocating this constant

   // pool.

   if (cp->tags() != NULL) {

     oop* base = (oop*)cp->base();

     for (int i = 0; i < cp->length(); ++i, ++base) {

       if (cp->is_pointer_entry(i)) {

         PSParallelCompact::adjust_pointer(base);

       }

     }

   }

   PSParallelCompact::adjust_pointer(cp->tags_addr());

   PSParallelCompact::adjust_pointer(cp->cache_addr());

   PSParallelCompact::adjust_pointer(cp->operands_addr());

   PSParallelCompact::adjust_pointer(cp->pool_holder_addr());

   return cp->object_size();

 }

 void constantPoolKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {

   assert(obj->is_constantPool(), "should be constant pool");

   constantPoolOop cp = (constantPoolOop) obj;

   if (AnonymousClasses && cp->has_pseudo_string() && cp->tags() != NULL) {

     oop* base = (oop*)cp->base();

     for (int i = 0; i < cp->length(); ++i, ++base) {

       if (cp->tag_at(i).is_string()) {

         if (PSScavenge::should_scavenge(base)) {

           pm->claim_or_forward_depth(base);

         }

       }

     }

   }

 }

 #endif // SERIALGC

 // Printing

 void constantPoolKlass::oop_print_on(oop obj, outputStream* st) {

   EXCEPTION_MARK;

   oop anObj;

   assert(obj->is_constantPool(), "must be constantPool");

   Klass::oop_print_on(obj, st);

   constantPoolOop cp = constantPoolOop(obj);

   if (cp->flags() != 0) {

     st->print(" - flags: 0x%x", cp->flags());

     if (cp->has_pseudo_string()) st->print(" has_pseudo_string");

     if (cp->has_invokedynamic()) st->print(" has_invokedynamic");

     st->cr();

   }

   st->print_cr(" - cache: " INTPTR_FORMAT, cp->cache());

   for (int index = 1; index < cp->length(); index++) {      // Index 0 is unused

     st->print(" - %3d : ", index);

     cp->tag_at(index).print_on(st);

     st->print(" : ");

     switch (cp->tag_at(index).value()) {

       case JVM_CONSTANT_Class :

         { anObj = cp->klass_at(index, CATCH);

           anObj->print_value_on(st);

           st->print(" {0x%lx}", (address)anObj);

         }

         break;

       case JVM_CONSTANT_Fieldref :

       case JVM_CONSTANT_Methodref :

       case JVM_CONSTANT_InterfaceMethodref :

         st->print("klass_index=%d", cp->uncached_klass_ref_index_at(index));

         st->print(" name_and_type_index=%d", cp->uncached_name_and_type_ref_index_at(index));

         break;

       case JVM_CONSTANT_UnresolvedString :

       case JVM_CONSTANT_String :

         if (cp->is_pseudo_string_at(index)) {

           anObj = cp->pseudo_string_at(index);

         } else {

           anObj = cp->string_at(index, CATCH);

         }

         anObj->print_value_on(st);

         st->print(" {0x%lx}", (address)anObj);

         break;

       case JVM_CONSTANT_Integer :

         st->print("%d", cp->int_at(index));

         break;

       case JVM_CONSTANT_Float :

         st->print("%f", cp->float_at(index));

         break;

       case JVM_CONSTANT_Long :

         st->print_jlong(cp->long_at(index));

         index++;   // Skip entry following eigth-byte constant

         break;

       case JVM_CONSTANT_Double :

         st->print("%lf", cp->double_at(index));

         index++;   // Skip entry following eigth-byte constant

         break;

       case JVM_CONSTANT_NameAndType :

         st->print("name_index=%d", cp->name_ref_index_at(index));

         st->print(" signature_index=%d", cp->signature_ref_index_at(index));

         break;

       case JVM_CONSTANT_Utf8 :

         cp->symbol_at(index)->print_value_on(st);

         break;

       case JVM_CONSTANT_UnresolvedClass :               // fall-through

       case JVM_CONSTANT_UnresolvedClassInError: {

         // unresolved_klass_at requires lock or safe world.

         CPSlot entry = cp->slot_at(index);

         if (entry.is_oop()) {

           entry.get_oop()->print_value_on(st);

         } else {

           entry.get_symbol()->print_value_on(st);

         }

         }

         break;

       case JVM_CONSTANT_MethodHandle :

         st->print("ref_kind=%d", cp->method_handle_ref_kind_at(index));

         st->print(" ref_index=%d", cp->method_handle_index_at(index));

         break;

       case JVM_CONSTANT_MethodType :

         st->print("signature_index=%d", cp->method_type_index_at(index));

         break;

       case JVM_CONSTANT_InvokeDynamicTrans :

       case JVM_CONSTANT_InvokeDynamic :

         {

           st->print("bootstrap_method_index=%d", cp->invoke_dynamic_bootstrap_method_ref_index_at(index));

           st->print(" name_and_type_index=%d", cp->invoke_dynamic_name_and_type_ref_index_at(index));

           int argc = cp->invoke_dynamic_argument_count_at(index);

           if (argc > 0) {

             for (int arg_i = 0; arg_i < argc; arg_i++) {

               int arg = cp->invoke_dynamic_argument_index_at(index, arg_i);

               st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);

             }

             st->print("}");

           }

         }

         break;

       default:

         ShouldNotReachHere();

         break;

     }

     st->cr();

   }

   st->cr();

 }

 void constantPoolKlass::oop_print_value_on(oop obj, outputStream* st) {

   assert(obj->is_constantPool(), "must be constantPool");

   constantPoolOop cp = constantPoolOop(obj);

   st->print("constant pool [%d]", cp->length());

   if (cp->has_pseudo_string()) st->print("/pseudo_string");

   if (cp->has_invokedynamic()) st->print("/invokedynamic");

   if (cp->operands() != NULL)  st->print("/operands[%d]", cp->operands()->length());

   cp->print_address_on(st);

   st->print(" for ");

   cp->pool_holder()->print_value_on(st);

   if (cp->cache() != NULL) {

     st->print(" cache=" PTR_FORMAT, cp->cache());

   }

 }

 const char* constantPoolKlass::internal_name() const {

   return "{constant pool}";

 }

 // Verification

 void constantPoolKlass::oop_verify_on(oop obj, outputStream* st) {

   Klass::oop_verify_on(obj, st);

   guarantee(obj->is_constantPool(), "object must be constant pool");

   constantPoolOop cp = constantPoolOop(obj);

   guarantee(cp->is_perm(), "should be in permspace");

   if (!cp->partially_loaded()) {

     for (int i = 0; i< cp->length();  i++) {

       CPSlot entry = cp->slot_at(i);

       if (cp->tag_at(i).is_klass()) {

         if (entry.is_oop()) {

           guarantee(entry.get_oop()->is_perm(),     "should be in permspace");

           guarantee(entry.get_oop()->is_klass(),    "should be klass");

         }

       }

       if (cp->tag_at(i).is_unresolved_klass()) {

         if (entry.is_oop()) {

           guarantee(entry.get_oop()->is_perm(),     "should be in permspace");

           guarantee(entry.get_oop()->is_klass(),    "should be klass");

         }

       }

       if (cp->tag_at(i).is_symbol()) {

         guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");

       }

       if (cp->tag_at(i).is_unresolved_string()) {

         if (entry.is_oop()) {

           guarantee(entry.get_oop()->is_perm(),     "should be in permspace");

           guarantee(entry.get_oop()->is_instance(), "should be instance");

         }

         else {

           guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");

         }

       }

       if (cp->tag_at(i).is_string()) {

         if (!cp->has_pseudo_string()) {

           if (entry.is_oop()) {

             guarantee(entry.get_oop()->is_perm(),   "should be in permspace");

             guarantee(entry.get_oop()->is_instance(), "should be instance");

           }

         } else {

           // can be non-perm, can be non-instance (array)

         }

       }

       // FIXME: verify JSR 292 tags JVM_CONSTANT_MethodHandle, etc.

     }

     guarantee(cp->tags()->is_perm(),         "should be in permspace");

     guarantee(cp->tags()->is_typeArray(),    "should be type array");

     if (cp->cache() != NULL) {

       // Note: cache() can be NULL before a class is completely setup or

       // in temporary constant pools used during constant pool merging

       guarantee(cp->cache()->is_perm(),              "should be in permspace");

       guarantee(cp->cache()->is_constantPoolCache(), "should be constant pool cache");

     }

     if (cp->operands() != NULL) {

       guarantee(cp->operands()->is_perm(),  "should be in permspace");

       guarantee(cp->operands()->is_typeArray(), "should be type array");

     }

     if (cp->pool_holder() != NULL) {

       // Note: pool_holder() can be NULL in temporary constant pools

       // used during constant pool merging

       guarantee(cp->pool_holder()->is_perm(),  "should be in permspace");

       guarantee(cp->pool_holder()->is_klass(), "should be klass");

     }

   }

 }

 bool constantPoolKlass::oop_partially_loaded(oop obj) const {

   assert(obj->is_constantPool(), "object must be constant pool");

   constantPoolOop cp = constantPoolOop(obj);

   return cp->tags() == NULL || cp->pool_holder() == (klassOop) cp;   // Check whether pool holder points to self

 }

 void constantPoolKlass::oop_set_partially_loaded(oop obj) {

   assert(obj->is_constantPool(), "object must be constant pool");

   constantPoolOop cp = constantPoolOop(obj);

   assert(cp->pool_holder() == NULL, "just checking");

   cp->set_pool_holder((klassOop) cp);   // Temporarily set pool holder to point to self

 }

 #ifndef PRODUCT

 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool

 void constantPoolKlass::preload_and_initialize_all_classes(oop obj, TRAPS) {

   guarantee(obj->is_constantPool(), "object must be constant pool");

   constantPoolHandle cp(THREAD, (constantPoolOop)obj);

   guarantee(!cp->partially_loaded(), "must be fully loaded");

   for (int i = 0; i< cp->length();  i++) {

     if (cp->tag_at(i).is_unresolved_klass()) {

       // This will force loading of the class

       klassOop klass = cp->klass_at(i, CHECK);

       if (klass->is_instance()) {

         // Force initialization of class

         instanceKlass::cast(klass)->initialize(CHECK);

       }

     }

   }

 }

 #endif