jdk8-mips64-public/hotspot: src/share/vm/oops/constantPool.cpp@16fb9f942703 (annotated)

src/share/vm/oops/constantPool.cpp@16fb9f942703 (annotated)

src/share/vm/oops/constantPool.cpp

Fri, 25 Jan 2013 15:06:18 -0500

author: acorn
date: Fri, 25 Jan 2013 15:06:18 -0500
changeset 4497: 16fb9f942703
parent 4490: 5daaddd917a1
child 4498: 0d26ce8e9251
permissions: -rw-r--r--

6479360: PrintClassHistogram improvements
Summary: jcmd <pid> GC.class_stats (UnlockDiagnosticVMOptions)
Reviewed-by: coleenp, hseigel, sla, acorn
Contributed-by: ioi.lam@oracle.com

 /*
  * Copyright (c) 1997, 2013, 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
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/classLoaderData.hpp"
 #include "classfile/javaClasses.hpp"
 #include "classfile/metadataOnStackMark.hpp"
 #include "classfile/symbolTable.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "interpreter/linkResolver.hpp"
 #include "memory/heapInspection.hpp"
 #include "memory/metadataFactory.hpp"
 #include "memory/oopFactory.hpp"
 #include "oops/constantPool.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/objArrayKlass.hpp"
 #include "runtime/fieldType.hpp"
 #include "runtime/init.hpp"
 #include "runtime/javaCalls.hpp"
 #include "runtime/signature.hpp"
 #include "runtime/vframe.hpp"
 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
   // Tags are RW but comment below applies to tags also.
   Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
   int size = ConstantPool::size(length);
   // CDS considerations:
   // Allocate read-write but may be able to move to read-only at dumping time
   // if all the klasses are resolved.  The only other field that is writable is
   // the resolved_references array, which is recreated at startup time.
   // But that could be moved to InstanceKlass (although a pain to access from
   // assembly code).  Maybe it could be moved to the cpCache which is RW.
   return new (loader_data, size, false, THREAD) ConstantPool(tags);
 }
 ConstantPool::ConstantPool(Array<u1>* tags) {
   set_length(tags->length());
   set_tags(NULL);
   set_cache(NULL);
   set_reference_map(NULL);
   set_resolved_references(NULL);
   set_operands(NULL);
   set_pool_holder(NULL);
   set_flags(0);
   // only set to non-zero if constant pool is merged by RedefineClasses
   set_version(0);
   set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
   // initialize tag array
   int length = tags->length();
   for (int index = 0; index < length; index++) {
     tags->at_put(index, JVM_CONSTANT_Invalid);
   }
   set_tags(tags);
 }
 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
   MetadataFactory::free_metadata(loader_data, cache());
   set_cache(NULL);
   MetadataFactory::free_array<jushort>(loader_data, operands());
   set_operands(NULL);
   release_C_heap_structures();
   // free tag array
   MetadataFactory::free_array<u1>(loader_data, tags());
   set_tags(NULL);
 }
 void ConstantPool::release_C_heap_structures() {
   // walk constant pool and decrement symbol reference counts
   unreference_symbols();
   delete _lock;
   set_lock(NULL);
 }
 objArrayOop ConstantPool::resolved_references() const {
   return (objArrayOop)JNIHandles::resolve(_resolved_references);
 }
 // Create resolved_references array and mapping array for original cp indexes
 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
 // to map it back for resolving and some unlikely miscellaneous uses.
 // The objects created by invokedynamic are appended to this list.
 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
                                                   intStack reference_map,
                                                   int constant_pool_map_length,
                                                    TRAPS) {
   // Initialized the resolved object cache.
   int map_length = reference_map.length();
   if (map_length > 0) {
     // Only need mapping back to constant pool entries.  The map isn't used for
     // invokedynamic resolved_reference entries.  The constant pool cache index
     // has the mapping back to both the constant pool and to the resolved
     // reference index.
     if (constant_pool_map_length > 0) {
       Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, map_length, CHECK);
       for (int i = 0; i < constant_pool_map_length; i++) {
         int x = reference_map.at(i);
         assert(x == (int)(jushort) x, "klass index is too big");
         om->at_put(i, (jushort)x);
       }
       set_reference_map(om);
     }
     // Create Java array for holding resolved strings, methodHandles,
     // methodTypes, invokedynamic and invokehandle appendix objects, etc.
     objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
     Handle refs_handle (THREAD, (oop)stom);  // must handleize.
     set_resolved_references(loader_data->add_handle(refs_handle));
   }
 }
 // CDS support. Create a new resolved_references array.
 void ConstantPool::restore_unshareable_info(TRAPS) {
   // restore the C++ vtable from the shared archive
   restore_vtable();
   if (SystemDictionary::Object_klass_loaded()) {
     // Recreate the object array and add to ClassLoaderData.
     int map_length = resolved_reference_length();
     if (map_length > 0) {
       objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
       Handle refs_handle (THREAD, (oop)stom);  // must handleize.
       ClassLoaderData* loader_data = pool_holder()->class_loader_data();
       set_resolved_references(loader_data->add_handle(refs_handle));
     }
     // Also need to recreate the mutex.  Make sure this matches the constructor
     set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
   }
 }
 void ConstantPool::remove_unshareable_info() {
   // Resolved references are not in the shared archive.
   // Save the length for restoration.  It is not necessarily the same length
   // as reference_map.length() if invokedynamic is saved.
   set_resolved_reference_length(
     resolved_references() != NULL ? resolved_references()->length() : 0);
   set_resolved_references(NULL);
   set_lock(NULL);
 }
 int ConstantPool::cp_to_object_index(int cp_index) {
   // this is harder don't do this so much.
   for (int i = 0; i< reference_map()->length(); i++) {
     if (reference_map()->at(i) == cp_index) return i;
     // Zero entry is divider between constant pool indices for strings,
     // method handles and method types. After that the index is a constant
     // pool cache index for invokedynamic.  Stop when zero (which can never
     // be a constant pool index)
     if (reference_map()->at(i) == 0) break;
   }
   // We might not find the index.
   return _no_index_sentinel;
 }
 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
   // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
   // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
   // tag is not updated atomicly.
   CPSlot entry = this_oop->slot_at(which);
   if (entry.is_resolved()) {
     assert(entry.get_klass()->is_klass(), "must be");
     // Already resolved - return entry.
     return entry.get_klass();
   }
   // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
   // already has updated the object
   assert(THREAD->is_Java_thread(), "must be a Java thread");
   bool do_resolve = false;
   bool in_error = false;
   // Create a handle for the mirror. This will preserve the resolved class
   // until the loader_data is registered.
   Handle mirror_handle;
   Symbol* name = NULL;
   Handle       loader;
   {  MonitorLockerEx ml(this_oop->lock());
     if (this_oop->tag_at(which).is_unresolved_klass()) {
       if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
         in_error = true;
       } else {
         do_resolve = true;
         name   = this_oop->unresolved_klass_at(which);
         loader = Handle(THREAD, this_oop->pool_holder()->class_loader());
       }
     }
   } // unlocking constantPool
   // The original attempt to resolve this constant pool entry failed so find the
   // original error and throw it again (JVMS 5.4.3).
   if (in_error) {
     Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
     guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
     ResourceMark rm;
     // exception text will be the class name
     const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
     THROW_MSG_0(error, className);
   }
   if (do_resolve) {
     // this_oop must be unlocked during resolve_or_fail
     oop protection_domain = this_oop->pool_holder()->protection_domain();
     Handle h_prot (THREAD, protection_domain);
     Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
     KlassHandle k;
     if (!HAS_PENDING_EXCEPTION) {
       k = KlassHandle(THREAD, k_oop);
       // preserve the resolved klass.
       mirror_handle = Handle(THREAD, k_oop->java_mirror());
       // Do access check for klasses
       verify_constant_pool_resolve(this_oop, k, THREAD);
     }
     // Failed to resolve class. We must record the errors so that subsequent attempts
     // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
     if (HAS_PENDING_EXCEPTION) {
       ResourceMark rm;
       Symbol* error = PENDING_EXCEPTION->klass()->name();
       bool throw_orig_error = false;
       {
         MonitorLockerEx ml(this_oop->lock());
         // some other thread has beaten us and has resolved the class.
         if (this_oop->tag_at(which).is_klass()) {
           CLEAR_PENDING_EXCEPTION;
           entry = this_oop->resolved_klass_at(which);
           return entry.get_klass();
         }
         if (!PENDING_EXCEPTION->
               is_a(SystemDictionary::LinkageError_klass())) {
           // Just throw the exception and don't prevent these classes from
           // being loaded due to virtual machine errors like StackOverflow
           // and OutOfMemoryError, etc, or if the thread was hit by stop()
           // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
         }
         else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
           SystemDictionary::add_resolution_error(this_oop, which, error);
           this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
         } else {
           // some other thread has put the class in error state.
           error = SystemDictionary::find_resolution_error(this_oop, which);
           assert(error != NULL, "checking");
           throw_orig_error = true;
         }
       } // unlocked
       if (throw_orig_error) {
         CLEAR_PENDING_EXCEPTION;
         ResourceMark rm;
         const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
         THROW_MSG_0(error, className);
       }
       return 0;
     }
     if (TraceClassResolution && !k()->oop_is_array()) {
       // skip resolving the constant pool so that this code get's
       // called the next time some bytecodes refer to this class.
       ResourceMark rm;
       int line_number = -1;
       const char * source_file = NULL;
       if (JavaThread::current()->has_last_Java_frame()) {
         // try to identify the method which called this function.
         vframeStream vfst(JavaThread::current());
         if (!vfst.at_end()) {
           line_number = vfst.method()->line_number_from_bci(vfst.bci());
           Symbol* s = vfst.method()->method_holder()->source_file_name();
           if (s != NULL) {
             source_file = s->as_C_string();
           }
         }
       }
       if (k() != this_oop->pool_holder()) {
         // only print something if the classes are different
         if (source_file != NULL) {
           tty->print("RESOLVE %s %s %s:%d\n",
                      this_oop->pool_holder()->external_name(),
                      InstanceKlass::cast(k())->external_name(), source_file, line_number);
         } else {
           tty->print("RESOLVE %s %s\n",
                      this_oop->pool_holder()->external_name(),
                      InstanceKlass::cast(k())->external_name());
         }
       }
       return k();
     } else {
       MonitorLockerEx ml(this_oop->lock());
       // Only updated constant pool - if it is resolved.
       do_resolve = this_oop->tag_at(which).is_unresolved_klass();
       if (do_resolve) {
         ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data();
         this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
         this_oop->klass_at_put(which, k());
       }
     }
   }
   entry = this_oop->resolved_klass_at(which);
   assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
   return entry.get_klass();
 }
 // Does not update ConstantPool* - to avoid any exception throwing. Used
 // by compiler and exception handling.  Also used to avoid classloads for
 // instanceof operations. Returns NULL if the class has not been loaded or
 // if the verification of constant pool failed
 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
   CPSlot entry = this_oop->slot_at(which);
   if (entry.is_resolved()) {
     assert(entry.get_klass()->is_klass(), "must be");
     return entry.get_klass();
   } else {
     assert(entry.is_unresolved(), "must be either symbol or klass");
     Thread *thread = Thread::current();
     Symbol* name = entry.get_symbol();
     oop loader = this_oop->pool_holder()->class_loader();
     oop protection_domain = this_oop->pool_holder()->protection_domain();
     Handle h_prot (thread, protection_domain);
     Handle h_loader (thread, loader);
     Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
     if (k != NULL) {
       // Make sure that resolving is legal
       EXCEPTION_MARK;
       KlassHandle klass(THREAD, k);
       // return NULL if verification fails
       verify_constant_pool_resolve(this_oop, klass, THREAD);
       if (HAS_PENDING_EXCEPTION) {
         CLEAR_PENDING_EXCEPTION;
         return NULL;
       }
       return klass();
     } else {
       return k;
     }
   }
 }
 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
   return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
 }
 // This is an interface for the compiler that allows accessing non-resolved entries
 // in the constant pool - but still performs the validations tests. Must be used
 // in a pre-parse of the compiler - to determine what it can do and not do.
 // Note: We cannot update the ConstantPool from the vm_thread.
 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
   int which = this_oop->klass_ref_index_at(index);
   CPSlot entry = this_oop->slot_at(which);
   if (entry.is_resolved()) {
     assert(entry.get_klass()->is_klass(), "must be");
     return entry.get_klass();
   } else {
     assert(entry.is_unresolved(), "must be either symbol or klass");
     Symbol*  name  = entry.get_symbol();
     oop loader = this_oop->pool_holder()->class_loader();
     oop protection_domain = this_oop->pool_holder()->protection_domain();
     Handle h_loader(THREAD, loader);
     Handle h_prot  (THREAD, protection_domain);
     KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
     // Do access check for klasses
     if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
     return k();
   }
 }
 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
                                                    int which) {
   if (cpool->cache() == NULL)  return NULL;  // nothing to load yet
   int cache_index = decode_cpcache_index(which, true);
   if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
     // FIXME: should be an assert
     if (PrintMiscellaneous && (Verbose||WizardMode)) {
       tty->print_cr("bad operand %d in:", which); cpool->print();
     }
     return NULL;
   }
   ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
   return e->method_if_resolved(cpool);
 }
 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
   if (cpool->cache() == NULL)  return false;  // nothing to load yet
   int cache_index = decode_cpcache_index(which, true);
   ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
   return e->has_appendix();
 }
 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
   if (cpool->cache() == NULL)  return NULL;  // nothing to load yet
   int cache_index = decode_cpcache_index(which, true);
   ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
   return e->appendix_if_resolved(cpool);
 }
 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) {
   if (cpool->cache() == NULL)  return false;  // nothing to load yet
   int cache_index = decode_cpcache_index(which, true);
   ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
   return e->has_method_type();
 }
 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) {
   if (cpool->cache() == NULL)  return NULL;  // nothing to load yet
   int cache_index = decode_cpcache_index(which, true);
   ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
   return e->method_type_if_resolved(cpool);
 }
 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
   int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
   return symbol_at(name_index);
 }
 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
   int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
   return symbol_at(signature_index);
 }
 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
   int i = which;
   if (!uncached && cache() != NULL) {
     if (ConstantPool::is_invokedynamic_index(which)) {
       // Invokedynamic index is index into resolved_references
       int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
       pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
       assert(tag_at(pool_index).is_name_and_type(), "");
       return pool_index;
     }
     // change byte-ordering and go via cache
     i = remap_instruction_operand_from_cache(which);
   } else {
     if (tag_at(which).is_invoke_dynamic()) {
       int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
       assert(tag_at(pool_index).is_name_and_type(), "");
       return pool_index;
     }
   }
   assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
   assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
   jint ref_index = *int_at_addr(i);
   return extract_high_short_from_int(ref_index);
 }
 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
   guarantee(!ConstantPool::is_invokedynamic_index(which),
             "an invokedynamic instruction does not have a klass");
   int i = which;
   if (!uncached && cache() != NULL) {
     // change byte-ordering and go via cache
     i = remap_instruction_operand_from_cache(which);
   }
   assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
   jint ref_index = *int_at_addr(i);
   return extract_low_short_from_int(ref_index);
 }
 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
   int cpc_index = operand;
   DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
   assert((int)(u2)cpc_index == cpc_index, "clean u2");
   int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
   return member_index;
 }
 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
  if (k->oop_is_instance() || k->oop_is_objArray()) {
     instanceKlassHandle holder (THREAD, this_oop->pool_holder());
     Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
     KlassHandle element (THREAD, elem_oop);
     // The element type could be a typeArray - we only need the access check if it is
     // an reference to another class
     if (element->oop_is_instance()) {
       LinkResolver::check_klass_accessability(holder, element, CHECK);
     }
   }
 }
 int ConstantPool::name_ref_index_at(int which_nt) {
   jint ref_index = name_and_type_at(which_nt);
   return extract_low_short_from_int(ref_index);
 }
 int ConstantPool::signature_ref_index_at(int which_nt) {
   jint ref_index = name_and_type_at(which_nt);
   return extract_high_short_from_int(ref_index);
 }
 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
   return klass_at(klass_ref_index_at(which), CHECK_NULL);
 }
 Symbol* ConstantPool::klass_name_at(int which) {
   assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
          "Corrupted constant pool");
   // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
   // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
   // tag is not updated atomicly.
   CPSlot entry = slot_at(which);
   if (entry.is_resolved()) {
     // Already resolved - return entry's name.
     assert(entry.get_klass()->is_klass(), "must be");
     return entry.get_klass()->name();
   } else {
     assert(entry.is_unresolved(), "must be either symbol or klass");
     return entry.get_symbol();
   }
 }
 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
   jint ref_index = klass_ref_index_at(which);
   return klass_at_noresolve(ref_index);
 }
 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
   jint ref_index = uncached_klass_ref_index_at(which);
   return klass_at_noresolve(ref_index);
 }
 char* ConstantPool::string_at_noresolve(int which) {
   Symbol* s = unresolved_string_at(which);
   if (s == NULL) {
     return (char*)"<pseudo-string>";
   } else {
     return unresolved_string_at(which)->as_C_string();
   }
 }
 BasicType ConstantPool::basic_type_for_signature_at(int which) {
   return FieldType::basic_type(symbol_at(which));
 }
 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
   for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
     if (this_oop->tag_at(index).is_string()) {
       this_oop->string_at(index, CHECK);
     }
   }
 }
 // Resolve all the classes in the constant pool.  If they are all resolved,
 // the constant pool is read-only.  Enhancement: allocate cp entries to
 // another metaspace, and copy to read-only or read-write space if this
 // bit is set.
 bool ConstantPool::resolve_class_constants(TRAPS) {
   constantPoolHandle cp(THREAD, this);
   for (int index = 1; index < length(); index++) { // Index 0 is unused
     if (tag_at(index).is_unresolved_klass() &&
         klass_at_if_loaded(cp, index) == NULL) {
       return false;
   }
   }
   // set_preresolution(); or some bit for future use
   return true;
 }
 // If resolution for MethodHandle or MethodType fails, save the exception
 // in the resolution error table, so that the same exception is thrown again.
 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which,
                                      int tag, TRAPS) {
   ResourceMark rm;
   Symbol* error = PENDING_EXCEPTION->klass()->name();
   MonitorLockerEx ml(this_oop->lock());  // lock cpool to change tag.
   int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
            JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
   if (!PENDING_EXCEPTION->
     is_a(SystemDictionary::LinkageError_klass())) {
     // Just throw the exception and don't prevent these classes from
     // being loaded due to virtual machine errors like StackOverflow
     // and OutOfMemoryError, etc, or if the thread was hit by stop()
     // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
   } else if (this_oop->tag_at(which).value() != error_tag) {
     SystemDictionary::add_resolution_error(this_oop, which, error);
     this_oop->tag_at_put(which, error_tag);
   } else {
     // some other thread has put the class in error state.
     error = SystemDictionary::find_resolution_error(this_oop, which);
     assert(error != NULL, "checking");
     CLEAR_PENDING_EXCEPTION;
     THROW_MSG(error, "");
   }
 }
 // Called to resolve constants in the constant pool and return an oop.
 // Some constant pool entries cache their resolved oop. This is also
 // called to create oops from constants to use in arguments for invokedynamic
 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
   oop result_oop = NULL;
   Handle throw_exception;
   if (cache_index == _possible_index_sentinel) {
     // It is possible that this constant is one which is cached in the objects.
     // We'll do a linear search.  This should be OK because this usage is rare.
     assert(index > 0, "valid index");
     cache_index = this_oop->cp_to_object_index(index);
   }
   assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
   assert(index == _no_index_sentinel || index >= 0, "");
   if (cache_index >= 0) {
     result_oop = this_oop->resolved_references()->obj_at(cache_index);
     if (result_oop != NULL) {
       return result_oop;
       // That was easy...
     }
     index = this_oop->object_to_cp_index(cache_index);
   }
   jvalue prim_value;  // temp used only in a few cases below
   int tag_value = this_oop->tag_at(index).value();
   switch (tag_value) {
   case JVM_CONSTANT_UnresolvedClass:
   case JVM_CONSTANT_UnresolvedClassInError:
   case JVM_CONSTANT_Class:
     {
       assert(cache_index == _no_index_sentinel, "should not have been set");
       Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
       // ldc wants the java mirror.
       result_oop = resolved->java_mirror();
       break;
     }
   case JVM_CONSTANT_String:
     assert(cache_index != _no_index_sentinel, "should have been set");
     if (this_oop->is_pseudo_string_at(index)) {
       result_oop = this_oop->pseudo_string_at(index, cache_index);
       break;
     }
     result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
     break;
   case JVM_CONSTANT_Object:
     result_oop = this_oop->object_at(index);
     break;
   case JVM_CONSTANT_MethodHandleInError:
   case JVM_CONSTANT_MethodTypeInError:
     {
       Symbol* error = SystemDictionary::find_resolution_error(this_oop, index);
       guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
       ResourceMark rm;
       THROW_MSG_0(error, "");
       break;
     }
   case JVM_CONSTANT_MethodHandle:
     {
       int ref_kind                 = this_oop->method_handle_ref_kind_at(index);
       int callee_index             = this_oop->method_handle_klass_index_at(index);
       Symbol*  name =      this_oop->method_handle_name_ref_at(index);
       Symbol*  signature = this_oop->method_handle_signature_ref_at(index);
       if (PrintMiscellaneous)
         tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
                       ref_kind, index, this_oop->method_handle_index_at(index),
                       callee_index, name->as_C_string(), signature->as_C_string());
       KlassHandle callee;
       { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
         callee = KlassHandle(THREAD, k);
       }
       KlassHandle klass(THREAD, this_oop->pool_holder());
       Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
                                                                    callee, name, signature,
                                                                    THREAD);
       result_oop = value();
       if (HAS_PENDING_EXCEPTION) {
         save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
       }
       break;
     }
   case JVM_CONSTANT_MethodType:
     {
       Symbol*  signature = this_oop->method_type_signature_at(index);
       if (PrintMiscellaneous)
         tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
                       index, this_oop->method_type_index_at(index),
                       signature->as_C_string());
       KlassHandle klass(THREAD, this_oop->pool_holder());
       Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
       result_oop = value();
       if (HAS_PENDING_EXCEPTION) {
         save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
       }
       break;
     }
   case JVM_CONSTANT_Integer:
     assert(cache_index == _no_index_sentinel, "should not have been set");
     prim_value.i = this_oop->int_at(index);
     result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
     break;
   case JVM_CONSTANT_Float:
     assert(cache_index == _no_index_sentinel, "should not have been set");
     prim_value.f = this_oop->float_at(index);
     result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
     break;
   case JVM_CONSTANT_Long:
     assert(cache_index == _no_index_sentinel, "should not have been set");
     prim_value.j = this_oop->long_at(index);
     result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
     break;
   case JVM_CONSTANT_Double:
     assert(cache_index == _no_index_sentinel, "should not have been set");
     prim_value.d = this_oop->double_at(index);
     result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
     break;
   default:
     DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
                               this_oop(), index, cache_index, tag_value) );
     assert(false, "unexpected constant tag");
     break;
   }
   if (cache_index >= 0) {
     // Cache the oop here also.
     Handle result_handle(THREAD, result_oop);
     MonitorLockerEx ml(this_oop->lock());  // don't know if we really need this
     oop result = this_oop->resolved_references()->obj_at(cache_index);
     // Benign race condition:  resolved_references may already be filled in while we were trying to lock.
     // The important thing here is that all threads pick up the same result.
     // It doesn't matter which racing thread wins, as long as only one
     // result is used by all threads, and all future queries.
     // That result may be either a resolved constant or a failure exception.
     if (result == NULL) {
       this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
       return result_handle();
     } else {
       // Return the winning thread's result.  This can be different than
       // result_handle() for MethodHandles.
       return result;
     }
   } else {
     return result_oop;
   }
 }
 oop ConstantPool::uncached_string_at(int which, TRAPS) {
   Symbol* sym = unresolved_string_at(which);
   oop str = StringTable::intern(sym, CHECK_(NULL));
   assert(java_lang_String::is_instance(str), "must be string");
   return str;
 }
 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
   assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
   Handle bsm;
   int argc;
   {
     // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
     // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
     // It is accompanied by the optional arguments.
     int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
     oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
     if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
       THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
     }
     // Extract the optional static arguments.
     argc = this_oop->invoke_dynamic_argument_count_at(index);
     if (argc == 0)  return bsm_oop;
     bsm = Handle(THREAD, bsm_oop);
   }
   objArrayHandle info;
   {
     objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
     info = objArrayHandle(THREAD, info_oop);
   }
   info->obj_at_put(0, bsm());
   for (int i = 0; i < argc; i++) {
     int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
     oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
     info->obj_at_put(1+i, arg_oop);
   }
   return info();
 }
 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
   // If the string has already been interned, this entry will be non-null
   oop str = this_oop->resolved_references()->obj_at(obj_index);
   if (str != NULL) return str;
       Symbol* sym = this_oop->unresolved_string_at(which);
   str = StringTable::intern(sym, CHECK_(NULL));
   this_oop->string_at_put(which, obj_index, str);
   assert(java_lang_String::is_instance(str), "must be string");
   return str;
 }
 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
                                                 int which) {
   // Names are interned, so we can compare Symbol*s directly
   Symbol* cp_name = klass_name_at(which);
   return (cp_name == k->name());
 }
 // Iterate over symbols and decrement ones which are Symbol*s.
 // This is done during GC so do not need to lock constantPool unless we
 // have per-thread safepoints.
 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
 // these symbols but didn't increment the reference count.
 void ConstantPool::unreference_symbols() {
   for (int index = 1; index < length(); index++) { // Index 0 is unused
     constantTag tag = tag_at(index);
     if (tag.is_symbol()) {
       symbol_at(index)->decrement_refcount();
     }
   }
 }
 // Compare this constant pool's entry at index1 to the constant pool
 // cp2's entry at index2.
 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
        int index2, TRAPS) {
   jbyte t1 = tag_at(index1).value();
   jbyte t2 = cp2->tag_at(index2).value();
   // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
   // when comparing
   if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
     t1 = JVM_CONSTANT_UnresolvedClass;
   }
   if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
     t2 = JVM_CONSTANT_UnresolvedClass;
   }
   if (t1 != t2) {
     // Not the same entry type so there is nothing else to check. Note
     // that this style of checking will consider resolved/unresolved
     // class pairs as different.
     // From the ConstantPool* API point of view, this is correct
     // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
     // plays out in the context of ConstantPool* merging.
     return false;
   }
   switch (t1) {
   case JVM_CONSTANT_Class:
   {
     Klass* k1 = klass_at(index1, CHECK_false);
     Klass* k2 = cp2->klass_at(index2, CHECK_false);
     if (k1 == k2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_ClassIndex:
   {
     int recur1 = klass_index_at(index1);
     int recur2 = cp2->klass_index_at(index2);
     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
     if (match) {
       return true;
     }
   } break;
   case JVM_CONSTANT_Double:
   {
     jdouble d1 = double_at(index1);
     jdouble d2 = cp2->double_at(index2);
     if (d1 == d2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_Fieldref:
   case JVM_CONSTANT_InterfaceMethodref:
   case JVM_CONSTANT_Methodref:
   {
     int recur1 = uncached_klass_ref_index_at(index1);
     int recur2 = cp2->uncached_klass_ref_index_at(index2);
     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
     if (match) {
       recur1 = uncached_name_and_type_ref_index_at(index1);
       recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
       match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
       if (match) {
         return true;
       }
     }
   } break;
   case JVM_CONSTANT_Float:
   {
     jfloat f1 = float_at(index1);
     jfloat f2 = cp2->float_at(index2);
     if (f1 == f2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_Integer:
   {
     jint i1 = int_at(index1);
     jint i2 = cp2->int_at(index2);
     if (i1 == i2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_Long:
   {
     jlong l1 = long_at(index1);
     jlong l2 = cp2->long_at(index2);
     if (l1 == l2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_NameAndType:
   {
     int recur1 = name_ref_index_at(index1);
     int recur2 = cp2->name_ref_index_at(index2);
     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
     if (match) {
       recur1 = signature_ref_index_at(index1);
       recur2 = cp2->signature_ref_index_at(index2);
       match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
       if (match) {
         return true;
       }
     }
   } break;
   case JVM_CONSTANT_StringIndex:
   {
     int recur1 = string_index_at(index1);
     int recur2 = cp2->string_index_at(index2);
     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
     if (match) {
       return true;
     }
   } break;
   case JVM_CONSTANT_UnresolvedClass:
   {
     Symbol* k1 = unresolved_klass_at(index1);
     Symbol* k2 = cp2->unresolved_klass_at(index2);
     if (k1 == k2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_MethodType:
   {
     int k1 = method_type_index_at(index1);
     int k2 = cp2->method_type_index_at(index2);
     bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
     if (match) {
       return true;
     }
   } break;
   case JVM_CONSTANT_MethodHandle:
   {
     int k1 = method_handle_ref_kind_at(index1);
     int k2 = cp2->method_handle_ref_kind_at(index2);
     if (k1 == k2) {
       int i1 = method_handle_index_at(index1);
       int i2 = cp2->method_handle_index_at(index2);
       bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
       if (match) {
         return true;
       }
     }
   } break;
   case JVM_CONSTANT_InvokeDynamic:
   {
     int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
     int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
     bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
     if (!match)  return false;
     k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
     k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
     match = compare_entry_to(k1, cp2, k2, CHECK_false);
     if (!match)  return false;
     int argc = invoke_dynamic_argument_count_at(index1);
     if (argc == cp2->invoke_dynamic_argument_count_at(index2)) {
       for (int j = 0; j < argc; j++) {
         k1 = invoke_dynamic_argument_index_at(index1, j);
         k2 = cp2->invoke_dynamic_argument_index_at(index2, j);
         match = compare_entry_to(k1, cp2, k2, CHECK_false);
         if (!match)  return false;
       }
       return true;           // got through loop; all elements equal
     }
   } break;
   case JVM_CONSTANT_String:
   {
     Symbol* s1 = unresolved_string_at(index1);
     Symbol* s2 = cp2->unresolved_string_at(index2);
     if (s1 == s2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_Utf8:
   {
     Symbol* s1 = symbol_at(index1);
     Symbol* s2 = cp2->symbol_at(index2);
     if (s1 == s2) {
       return true;
     }
   } break;
   // Invalid is used as the tag for the second constant pool entry
   // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
   // not be seen by itself.
   case JVM_CONSTANT_Invalid: // fall through
   default:
     ShouldNotReachHere();
     break;
   }
   return false;
 } // end compare_entry_to()
 // Copy this constant pool's entries at start_i to end_i (inclusive)
 // to the constant pool to_cp's entries starting at to_i. A total of
 // (end_i - start_i) + 1 entries are copied.
 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
        constantPoolHandle to_cp, int to_i, TRAPS) {
   int dest_i = to_i;  // leave original alone for debug purposes
   for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
     copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
     switch (from_cp->tag_at(src_i).value()) {
     case JVM_CONSTANT_Double:
     case JVM_CONSTANT_Long:
       // double and long take two constant pool entries
       src_i += 2;
       dest_i += 2;
       break;
     default:
       // all others take one constant pool entry
       src_i++;
       dest_i++;
       break;
     }
   }
   int from_oplen = operand_array_length(from_cp->operands());
   int old_oplen  = operand_array_length(to_cp->operands());
   if (from_oplen != 0) {
     ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
     // append my operands to the target's operands array
     if (old_oplen == 0) {
       // Can't just reuse from_cp's operand list because of deallocation issues
       int len = from_cp->operands()->length();
       Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
       Copy::conjoint_memory_atomic(
           from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
       to_cp->set_operands(new_ops);
     } else {
       int old_len  = to_cp->operands()->length();
       int from_len = from_cp->operands()->length();
       int old_off  = old_oplen * sizeof(u2);
       int from_off = from_oplen * sizeof(u2);
       // Use the metaspace for the destination constant pool
       Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
       int fillp = 0, len = 0;
       // first part of dest
       Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
                                    new_operands->adr_at(fillp),
                                    (len = old_off) * sizeof(u2));
       fillp += len;
       // first part of src
       Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
                                    new_operands->adr_at(fillp),
                                    (len = from_off) * sizeof(u2));
       fillp += len;
       // second part of dest
       Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
                                    new_operands->adr_at(fillp),
                                    (len = old_len - old_off) * sizeof(u2));
       fillp += len;
       // second part of src
       Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(from_off),
                                    new_operands->adr_at(fillp),
                                    (len = from_len - from_off) * sizeof(u2));
       fillp += len;
       assert(fillp == new_operands->length(), "");
       // Adjust indexes in the first part of the copied operands array.
       for (int j = 0; j < from_oplen; j++) {
         int offset = operand_offset_at(new_operands, old_oplen + j);
         assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
         offset += old_len;  // every new tuple is preceded by old_len extra u2's
         operand_offset_at_put(new_operands, old_oplen + j, offset);
       }
       // replace target operands array with combined array
       to_cp->set_operands(new_operands);
     }
   }
 } // end copy_cp_to()
 // Copy this constant pool's entry at from_i to the constant pool
 // to_cp's entry at to_i.
 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
                                         constantPoolHandle to_cp, int to_i,
                                         TRAPS) {
   int tag = from_cp->tag_at(from_i).value();
   switch (tag) {
   case JVM_CONSTANT_Class:
   {
     Klass* k = from_cp->klass_at(from_i, CHECK);
     to_cp->klass_at_put(to_i, k);
   } break;
   case JVM_CONSTANT_ClassIndex:
   {
     jint ki = from_cp->klass_index_at(from_i);
     to_cp->klass_index_at_put(to_i, ki);
   } break;
   case JVM_CONSTANT_Double:
   {
     jdouble d = from_cp->double_at(from_i);
     to_cp->double_at_put(to_i, d);
     // double takes two constant pool entries so init second entry's tag
     to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
   } break;
   case JVM_CONSTANT_Fieldref:
   {
     int class_index = from_cp->uncached_klass_ref_index_at(from_i);
     int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
     to_cp->field_at_put(to_i, class_index, name_and_type_index);
   } break;
   case JVM_CONSTANT_Float:
   {
     jfloat f = from_cp->float_at(from_i);
     to_cp->float_at_put(to_i, f);
   } break;
   case JVM_CONSTANT_Integer:
   {
     jint i = from_cp->int_at(from_i);
     to_cp->int_at_put(to_i, i);
   } break;
   case JVM_CONSTANT_InterfaceMethodref:
   {
     int class_index = from_cp->uncached_klass_ref_index_at(from_i);
     int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
     to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
   } break;
   case JVM_CONSTANT_Long:
   {
     jlong l = from_cp->long_at(from_i);
     to_cp->long_at_put(to_i, l);
     // long takes two constant pool entries so init second entry's tag
     to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
   } break;
   case JVM_CONSTANT_Methodref:
   {
     int class_index = from_cp->uncached_klass_ref_index_at(from_i);
     int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
     to_cp->method_at_put(to_i, class_index, name_and_type_index);
   } break;
   case JVM_CONSTANT_NameAndType:
   {
     int name_ref_index = from_cp->name_ref_index_at(from_i);
     int signature_ref_index = from_cp->signature_ref_index_at(from_i);
     to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
   } break;
   case JVM_CONSTANT_StringIndex:
   {
     jint si = from_cp->string_index_at(from_i);
     to_cp->string_index_at_put(to_i, si);
   } break;
   case JVM_CONSTANT_UnresolvedClass:
   {
     // Can be resolved after checking tag, so check the slot first.
     CPSlot entry = from_cp->slot_at(from_i);
     if (entry.is_resolved()) {
       assert(entry.get_klass()->is_klass(), "must be");
       // Already resolved
       to_cp->klass_at_put(to_i, entry.get_klass());
     } else {
       to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
     }
   } break;
   case JVM_CONSTANT_UnresolvedClassInError:
   {
     Symbol* k = from_cp->unresolved_klass_at(from_i);
     to_cp->unresolved_klass_at_put(to_i, k);
     to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
   } break;
   case JVM_CONSTANT_String:
   {
     Symbol* s = from_cp->unresolved_string_at(from_i);
     to_cp->unresolved_string_at_put(to_i, s);
   } break;
   case JVM_CONSTANT_Utf8:
   {
     Symbol* s = from_cp->symbol_at(from_i);
     // Need to increase refcount, the old one will be thrown away and deferenced
     s->increment_refcount();
     to_cp->symbol_at_put(to_i, s);
   } break;
   case JVM_CONSTANT_MethodType:
   {
     jint k = from_cp->method_type_index_at(from_i);
     to_cp->method_type_index_at_put(to_i, k);
   } break;
   case JVM_CONSTANT_MethodHandle:
   {
     int k1 = from_cp->method_handle_ref_kind_at(from_i);
     int k2 = from_cp->method_handle_index_at(from_i);
     to_cp->method_handle_index_at_put(to_i, k1, k2);
   } break;
   case JVM_CONSTANT_InvokeDynamic:
   {
     int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
     int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
     k1 += operand_array_length(to_cp->operands());  // to_cp might already have operands
     to_cp->invoke_dynamic_at_put(to_i, k1, k2);
   } break;
   // Invalid is used as the tag for the second constant pool entry
   // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
   // not be seen by itself.
   case JVM_CONSTANT_Invalid: // fall through
   default:
   {
     ShouldNotReachHere();
   } break;
   }
 } // end copy_entry_to()
 // Search constant pool search_cp for an entry that matches this
 // constant pool's entry at pattern_i. Returns the index of a
 // matching entry or zero (0) if there is no matching entry.
 int ConstantPool::find_matching_entry(int pattern_i,
       constantPoolHandle search_cp, TRAPS) {
   // index zero (0) is not used
   for (int i = 1; i < search_cp->length(); i++) {
     bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
     if (found) {
       return i;
     }
   }
   return 0;  // entry not found; return unused index zero (0)
 } // end find_matching_entry()
 #ifndef PRODUCT
 const char* ConstantPool::printable_name_at(int which) {
   constantTag tag = tag_at(which);
   if (tag.is_string()) {
     return string_at_noresolve(which);
   } else if (tag.is_klass() || tag.is_unresolved_klass()) {
     return klass_name_at(which)->as_C_string();
   } else if (tag.is_symbol()) {
     return symbol_at(which)->as_C_string();
   }
   return "";
 }
 #endif // PRODUCT
 // JVMTI GetConstantPool support
 // For temporary use until code is stable.
 #define DBG(code)
 static const char* WARN_MSG = "Must not be such entry!";
 static void print_cpool_bytes(jint cnt, u1 *bytes) {
   jint size = 0;
   u2   idx1, idx2;
   for (jint idx = 1; idx < cnt; idx++) {
     jint ent_size = 0;
     u1   tag  = *bytes++;
     size++;                       // count tag
     printf("const #%03d, tag: %02d ", idx, tag);
     switch(tag) {
       case JVM_CONSTANT_Invalid: {
         printf("Invalid");
         break;
       }
       case JVM_CONSTANT_Unicode: {
         printf("Unicode      %s", WARN_MSG);
         break;
       }
       case JVM_CONSTANT_Utf8: {
         u2 len = Bytes::get_Java_u2(bytes);
         char str[128];
         if (len > 127) {
            len = 127;
         }
         strncpy(str, (char *) (bytes+2), len);
         str[len] = '\0';
         printf("Utf8          \"%s\"", str);
         ent_size = 2 + len;
         break;
       }
       case JVM_CONSTANT_Integer: {
         u4 val = Bytes::get_Java_u4(bytes);
         printf("int          %d", *(int *) &val);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_Float: {
         u4 val = Bytes::get_Java_u4(bytes);
         printf("float        %5.3ff", *(float *) &val);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_Long: {
         u8 val = Bytes::get_Java_u8(bytes);
         printf("long         "INT64_FORMAT, (int64_t) *(jlong *) &val);
         ent_size = 8;
         idx++; // Long takes two cpool slots
         break;
       }
       case JVM_CONSTANT_Double: {
         u8 val = Bytes::get_Java_u8(bytes);
         printf("double       %5.3fd", *(jdouble *)&val);
         ent_size = 8;
         idx++; // Double takes two cpool slots
         break;
       }
       case JVM_CONSTANT_Class: {
         idx1 = Bytes::get_Java_u2(bytes);
         printf("class        #%03d", idx1);
         ent_size = 2;
         break;
       }
       case JVM_CONSTANT_String: {
         idx1 = Bytes::get_Java_u2(bytes);
         printf("String       #%03d", idx1);
         ent_size = 2;
         break;
       }
       case JVM_CONSTANT_Fieldref: {
         idx1 = Bytes::get_Java_u2(bytes);
         idx2 = Bytes::get_Java_u2(bytes+2);
         printf("Field        #%03d, #%03d", (int) idx1, (int) idx2);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_Methodref: {
         idx1 = Bytes::get_Java_u2(bytes);
         idx2 = Bytes::get_Java_u2(bytes+2);
         printf("Method       #%03d, #%03d", idx1, idx2);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_InterfaceMethodref: {
         idx1 = Bytes::get_Java_u2(bytes);
         idx2 = Bytes::get_Java_u2(bytes+2);
         printf("InterfMethod #%03d, #%03d", idx1, idx2);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_NameAndType: {
         idx1 = Bytes::get_Java_u2(bytes);
         idx2 = Bytes::get_Java_u2(bytes+2);
         printf("NameAndType  #%03d, #%03d", idx1, idx2);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_ClassIndex: {
         printf("ClassIndex  %s", WARN_MSG);
         break;
       }
       case JVM_CONSTANT_UnresolvedClass: {
         printf("UnresolvedClass: %s", WARN_MSG);
         break;
       }
       case JVM_CONSTANT_UnresolvedClassInError: {
         printf("UnresolvedClassInErr: %s", WARN_MSG);
         break;
       }
       case JVM_CONSTANT_StringIndex: {
         printf("StringIndex: %s", WARN_MSG);
         break;
       }
     }
     printf(";\n");
     bytes += ent_size;
     size  += ent_size;
   }
   printf("Cpool size: %d\n", size);
   fflush(0);
   return;
 } /* end print_cpool_bytes */
 // Returns size of constant pool entry.
 jint ConstantPool::cpool_entry_size(jint idx) {
   switch(tag_at(idx).value()) {
     case JVM_CONSTANT_Invalid:
     case JVM_CONSTANT_Unicode:
       return 1;
     case JVM_CONSTANT_Utf8:
       return 3 + symbol_at(idx)->utf8_length();
     case JVM_CONSTANT_Class:
     case JVM_CONSTANT_String:
     case JVM_CONSTANT_ClassIndex:
     case JVM_CONSTANT_UnresolvedClass:
     case JVM_CONSTANT_UnresolvedClassInError:
     case JVM_CONSTANT_StringIndex:
     case JVM_CONSTANT_MethodType:
       return 3;
     case JVM_CONSTANT_MethodHandle:
       return 4; //tag, ref_kind, ref_index
     case JVM_CONSTANT_Integer:
     case JVM_CONSTANT_Float:
     case JVM_CONSTANT_Fieldref:
     case JVM_CONSTANT_Methodref:
     case JVM_CONSTANT_InterfaceMethodref:
     case JVM_CONSTANT_NameAndType:
       return 5;
     case JVM_CONSTANT_InvokeDynamic:
       // u1 tag, u2 bsm, u2 nt
       return 5;
     case JVM_CONSTANT_Long:
     case JVM_CONSTANT_Double:
       return 9;
   }
   assert(false, "cpool_entry_size: Invalid constant pool entry tag");
   return 1;
 } /* end cpool_entry_size */
 // SymbolHashMap is used to find a constant pool index from a string.
 // This function fills in SymbolHashMaps, one for utf8s and one for
 // class names, returns size of the cpool raw bytes.
 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
                                           SymbolHashMap *classmap) {
   jint size = 0;
   for (u2 idx = 1; idx < length(); idx++) {
     u2 tag = tag_at(idx).value();
     size += cpool_entry_size(idx);
     switch(tag) {
       case JVM_CONSTANT_Utf8: {
         Symbol* sym = symbol_at(idx);
         symmap->add_entry(sym, idx);
         DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
         break;
       }
       case JVM_CONSTANT_Class:
       case JVM_CONSTANT_UnresolvedClass:
       case JVM_CONSTANT_UnresolvedClassInError: {
         Symbol* sym = klass_name_at(idx);
         classmap->add_entry(sym, idx);
         DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
         break;
       }
       case JVM_CONSTANT_Long:
       case JVM_CONSTANT_Double: {
         idx++; // Both Long and Double take two cpool slots
         break;
       }
     }
   }
   return size;
 } /* end hash_utf8_entries_to */
 // Copy cpool bytes.
 // Returns:
 //    0, in case of OutOfMemoryError
 //   -1, in case of internal error
 //  > 0, count of the raw cpool bytes that have been copied
 int ConstantPool::copy_cpool_bytes(int cpool_size,
                                           SymbolHashMap* tbl,
                                           unsigned char *bytes) {
   u2   idx1, idx2;
   jint size  = 0;
   jint cnt   = length();
   unsigned char *start_bytes = bytes;
   for (jint idx = 1; idx < cnt; idx++) {
     u1   tag      = tag_at(idx).value();
     jint ent_size = cpool_entry_size(idx);
     assert(size + ent_size <= cpool_size, "Size mismatch");
     *bytes = tag;
     DBG(printf("#%03hd tag=%03hd, ", idx, tag));
     switch(tag) {
       case JVM_CONSTANT_Invalid: {
         DBG(printf("JVM_CONSTANT_Invalid"));
         break;
       }
       case JVM_CONSTANT_Unicode: {
         assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
         DBG(printf("JVM_CONSTANT_Unicode"));
         break;
       }
       case JVM_CONSTANT_Utf8: {
         Symbol* sym = symbol_at(idx);
         char*     str = sym->as_utf8();
         // Warning! It's crashing on x86 with len = sym->utf8_length()
         int       len = (int) strlen(str);
         Bytes::put_Java_u2((address) (bytes+1), (u2) len);
         for (int i = 0; i < len; i++) {
             bytes[3+i] = (u1) str[i];
         }
         DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
         break;
       }
       case JVM_CONSTANT_Integer: {
         jint val = int_at(idx);
         Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
         break;
       }
       case JVM_CONSTANT_Float: {
         jfloat val = float_at(idx);
         Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
         break;
       }
       case JVM_CONSTANT_Long: {
         jlong val = long_at(idx);
         Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
         idx++;             // Long takes two cpool slots
         break;
       }
       case JVM_CONSTANT_Double: {
         jdouble val = double_at(idx);
         Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
         idx++;             // Double takes two cpool slots
         break;
       }
       case JVM_CONSTANT_Class:
       case JVM_CONSTANT_UnresolvedClass:
       case JVM_CONSTANT_UnresolvedClassInError: {
         *bytes = JVM_CONSTANT_Class;
         Symbol* sym = klass_name_at(idx);
         idx1 = tbl->symbol_to_value(sym);
         assert(idx1 != 0, "Have not found a hashtable entry");
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
         break;
       }
       case JVM_CONSTANT_String: {
         *bytes = JVM_CONSTANT_String;
         Symbol* sym = unresolved_string_at(idx);
         idx1 = tbl->symbol_to_value(sym);
         assert(idx1 != 0, "Have not found a hashtable entry");
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         DBG(char *str = sym->as_utf8());
         DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
         break;
       }
       case JVM_CONSTANT_Fieldref:
       case JVM_CONSTANT_Methodref:
       case JVM_CONSTANT_InterfaceMethodref: {
         idx1 = uncached_klass_ref_index_at(idx);
         idx2 = uncached_name_and_type_ref_index_at(idx);
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         Bytes::put_Java_u2((address) (bytes+3), idx2);
         DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
         break;
       }
       case JVM_CONSTANT_NameAndType: {
         idx1 = name_ref_index_at(idx);
         idx2 = signature_ref_index_at(idx);
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         Bytes::put_Java_u2((address) (bytes+3), idx2);
         DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
         break;
       }
       case JVM_CONSTANT_ClassIndex: {
         *bytes = JVM_CONSTANT_Class;
         idx1 = klass_index_at(idx);
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
         break;
       }
       case JVM_CONSTANT_StringIndex: {
         *bytes = JVM_CONSTANT_String;
         idx1 = string_index_at(idx);
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
         break;
       }
       case JVM_CONSTANT_MethodHandle:
       case JVM_CONSTANT_MethodHandleInError: {
         *bytes = JVM_CONSTANT_MethodHandle;
         int kind = method_handle_ref_kind_at(idx);
         idx1 = method_handle_index_at(idx);
         *(bytes+1) = (unsigned char) kind;
         Bytes::put_Java_u2((address) (bytes+2), idx1);
         DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
         break;
       }
       case JVM_CONSTANT_MethodType:
       case JVM_CONSTANT_MethodTypeInError: {
         *bytes = JVM_CONSTANT_MethodType;
         idx1 = method_type_index_at(idx);
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
         break;
       }
       case JVM_CONSTANT_InvokeDynamic: {
         *bytes = tag;
         idx1 = extract_low_short_from_int(*int_at_addr(idx));
         idx2 = extract_high_short_from_int(*int_at_addr(idx));
         assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         Bytes::put_Java_u2((address) (bytes+3), idx2);
         DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
         break;
       }
     }
     DBG(printf("\n"));
     bytes += ent_size;
     size  += ent_size;
   }
   assert(size == cpool_size, "Size mismatch");
   // Keep temorarily for debugging until it's stable.
   DBG(print_cpool_bytes(cnt, start_bytes));
   return (int)(bytes - start_bytes);
 } /* end copy_cpool_bytes */
 void ConstantPool::set_on_stack(const bool value) {
   if (value) {
     _flags |= _on_stack;
   } else {
     _flags &= ~_on_stack;
   }
   if (value) MetadataOnStackMark::record(this);
 }
 // JSR 292 support for patching constant pool oops after the class is linked and
 // the oop array for resolved references are created.
 // We can't do this during classfile parsing, which is how the other indexes are
 // patched.  The other patches are applied early for some error checking
 // so only defer the pseudo_strings.
 void ConstantPool::patch_resolved_references(
                                             GrowableArray<Handle>* cp_patches) {
   assert(EnableInvokeDynamic, "");
   for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
     Handle patch = cp_patches->at(index);
     if (patch.not_null()) {
       assert (tag_at(index).is_string(), "should only be string left");
       // Patching a string means pre-resolving it.
       // The spelling in the constant pool is ignored.
       // The constant reference may be any object whatever.
       // If it is not a real interned string, the constant is referred
       // to as a "pseudo-string", and must be presented to the CP
       // explicitly, because it may require scavenging.
       int obj_index = cp_to_object_index(index);
       pseudo_string_at_put(index, obj_index, patch());
       DEBUG_ONLY(cp_patches->at_put(index, Handle());)
     }
   }
 #ifdef ASSERT
   // Ensure that all the patches have been used.
   for (int index = 0; index < cp_patches->length(); index++) {
     assert(cp_patches->at(index).is_null(),
            err_msg("Unused constant pool patch at %d in class file %s",
                    index,
                    pool_holder()->external_name()));
   }
 #endif // ASSERT
 }
 #ifndef PRODUCT
 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
   guarantee(obj->is_constantPool(), "object must be constant pool");
   constantPoolHandle cp(THREAD, (ConstantPool*)obj);
   guarantee(cp->pool_holder() != NULL, "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
       Klass* klass = cp->klass_at(i, CHECK);
       if (klass->oop_is_instance()) {
         // Force initialization of class
         InstanceKlass::cast(klass)->initialize(CHECK);
       }
     }
   }
 }
 #endif
 // Printing
 void ConstantPool::print_on(outputStream* st) const {
   EXCEPTION_MARK;
   assert(is_constantPool(), "must be constantPool");
   st->print_cr(internal_name());
   if (flags() != 0) {
     st->print(" - flags: 0x%x", flags());
     if (has_pseudo_string()) st->print(" has_pseudo_string");
     if (has_invokedynamic()) st->print(" has_invokedynamic");
     if (has_preresolution()) st->print(" has_preresolution");
     if (on_stack()) st->print(" on_stack");
     st->cr();
   }
   if (pool_holder() != NULL) {
     st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
   }
   st->print_cr(" - cache: " INTPTR_FORMAT, cache());
   st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references());
   st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
   for (int index = 1; index < length(); index++) {      // Index 0 is unused
     ((ConstantPool*)this)->print_entry_on(index, st);
     switch (tag_at(index).value()) {
       case JVM_CONSTANT_Long :
       case JVM_CONSTANT_Double :
         index++;   // Skip entry following eigth-byte constant
     }
   }
   st->cr();
 }
 // Print one constant pool entry
 void ConstantPool::print_entry_on(const int index, outputStream* st) {
   EXCEPTION_MARK;
   st->print(" - %3d : ", index);
   tag_at(index).print_on(st);
   st->print(" : ");
   switch (tag_at(index).value()) {
     case JVM_CONSTANT_Class :
       { Klass* k = klass_at(index, CATCH);
         k->print_value_on(st);
         st->print(" {0x%lx}", (address)k);
       }
       break;
     case JVM_CONSTANT_Fieldref :
     case JVM_CONSTANT_Methodref :
     case JVM_CONSTANT_InterfaceMethodref :
       st->print("klass_index=%d", uncached_klass_ref_index_at(index));
       st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
       break;
     case JVM_CONSTANT_String :
       unresolved_string_at(index)->print_value_on(st);
       break;
     case JVM_CONSTANT_Object : {
       oop anObj = object_at(index);
       anObj->print_value_on(st);
       st->print(" {0x%lx}", (address)anObj);
       } break;
     case JVM_CONSTANT_Integer :
       st->print("%d", int_at(index));
       break;
     case JVM_CONSTANT_Float :
       st->print("%f", float_at(index));
       break;
     case JVM_CONSTANT_Long :
       st->print_jlong(long_at(index));
       break;
     case JVM_CONSTANT_Double :
       st->print("%lf", double_at(index));
       break;
     case JVM_CONSTANT_NameAndType :
       st->print("name_index=%d", name_ref_index_at(index));
       st->print(" signature_index=%d", signature_ref_index_at(index));
       break;
     case JVM_CONSTANT_Utf8 :
       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 = slot_at(index);
       if (entry.is_resolved()) {
         entry.get_klass()->print_value_on(st);
       } else {
         entry.get_symbol()->print_value_on(st);
       }
       }
       break;
     case JVM_CONSTANT_MethodHandle :
     case JVM_CONSTANT_MethodHandleInError :
       st->print("ref_kind=%d", method_handle_ref_kind_at(index));
       st->print(" ref_index=%d", method_handle_index_at(index));
       break;
     case JVM_CONSTANT_MethodType :
     case JVM_CONSTANT_MethodTypeInError :
       st->print("signature_index=%d", method_type_index_at(index));
       break;
     case JVM_CONSTANT_InvokeDynamic :
       {
         st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
         st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
         int argc = invoke_dynamic_argument_count_at(index);
         if (argc > 0) {
           for (int arg_i = 0; arg_i < argc; arg_i++) {
             int arg = 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();
 }
 void ConstantPool::print_value_on(outputStream* st) const {
   assert(is_constantPool(), "must be constantPool");
   st->print("constant pool [%d]", length());
   if (has_pseudo_string()) st->print("/pseudo_string");
   if (has_invokedynamic()) st->print("/invokedynamic");
   if (has_preresolution()) st->print("/preresolution");
   if (operands() != NULL)  st->print("/operands[%d]", operands()->length());
   print_address_on(st);
   st->print(" for ");
   pool_holder()->print_value_on(st);
   if (pool_holder() != NULL) {
     bool extra = (pool_holder()->constants() != this);
     if (extra)  st->print(" (extra)");
   }
   if (cache() != NULL) {
     st->print(" cache=" PTR_FORMAT, cache());
   }
 }
 #if INCLUDE_SERVICES
 // Size Statistics
 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
   sz->_cp_all_bytes += (sz->_cp_bytes          = sz->count(this));
   sz->_cp_all_bytes += (sz->_cp_tags_bytes     = sz->count_array(tags()));
   sz->_cp_all_bytes += (sz->_cp_cache_bytes    = sz->count(cache()));
   sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
   sz->_cp_all_bytes += (sz->_cp_refmap_bytes   = sz->count_array(reference_map()));
   sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
                    sz->_cp_refmap_bytes;
   sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
 }
 #endif // INCLUDE_SERVICES
 // Verification
 void ConstantPool::verify_on(outputStream* st) {
   guarantee(is_constantPool(), "object must be constant pool");
   for (int i = 0; i< length();  i++) {
     constantTag tag = tag_at(i);
     CPSlot entry = slot_at(i);
     if (tag.is_klass()) {
       if (entry.is_resolved()) {
         guarantee(entry.get_klass()->is_metadata(), "should be metadata");
         guarantee(entry.get_klass()->is_klass(),    "should be klass");
       }
     } else if (tag.is_unresolved_klass()) {
       if (entry.is_resolved()) {
         guarantee(entry.get_klass()->is_metadata(), "should be metadata");
         guarantee(entry.get_klass()->is_klass(),    "should be klass");
       }
     } else if (tag.is_symbol()) {
       guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
     } else if (tag.is_string()) {
       guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
     }
   }
   if (cache() != NULL) {
     // Note: cache() can be NULL before a class is completely setup or
     // in temporary constant pools used during constant pool merging
     guarantee(cache()->is_metadata(),          "should be metadata");
     guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
   }
   if (pool_holder() != NULL) {
     // Note: pool_holder() can be NULL in temporary constant pools
     // used during constant pool merging
     guarantee(pool_holder()->is_metadata(), "should be metadata");
     guarantee(pool_holder()->is_klass(),    "should be klass");
   }
 }
 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
   char *str = sym->as_utf8();
   unsigned int hash = compute_hash(str, sym->utf8_length());
   unsigned int index = hash % table_size();
   // check if already in map
   // we prefer the first entry since it is more likely to be what was used in
   // the class file
   for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
     assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
     if (en->hash() == hash && en->symbol() == sym) {
         return;  // already there
     }
   }
   SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
   entry->set_next(bucket(index));
   _buckets[index].set_entry(entry);
   assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
 }
 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
   assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
   char *str = sym->as_utf8();
   int   len = sym->utf8_length();
   unsigned int hash = SymbolHashMap::compute_hash(str, len);
   unsigned int index = hash % table_size();
   for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
     assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
     if (en->hash() == hash && en->symbol() == sym) {
       return en;
     }
   }
   return NULL;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/constantPool.cpp@16fb9f942703 (annotated)

src/share/vm/oops/constantPool.cpp