constantPool.cpp 69.7 KB
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/*
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 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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 * 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.
 *
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 * 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.
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 *
 */

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#include "precompiled.hpp"
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#include "classfile/classLoaderData.hpp"
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#include "classfile/javaClasses.hpp"
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#include "classfile/metadataOnStackMark.hpp"
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#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/vmSymbols.hpp"
#include "interpreter/linkResolver.hpp"
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#include "memory/heapInspection.hpp"
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#include "memory/metadataFactory.hpp"
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#include "memory/oopFactory.hpp"
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#include "oops/constantPool.hpp"
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#include "oops/instanceKlass.hpp"
#include "oops/objArrayKlass.hpp"
#include "runtime/fieldType.hpp"
#include "runtime/init.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/signature.hpp"
#include "runtime/vframe.hpp"
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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);
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  // only set to non-zero if constant pool is merged by RedefineClasses
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  set_version(0);
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  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) {
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  // restore the C++ vtable from the shared archive
  restore_vtable();

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  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*.
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  // 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.
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  CPSlot entry = this_oop->slot_at(which);
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  if (entry.is_resolved()) {
    assert(entry.get_klass()->is_klass(), "must be");
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    // Already resolved - return entry.
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    return entry.get_klass();
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  }

  // 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;

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  // Create a handle for the mirror. This will preserve the resolved class
  // until the loader_data is registered.
  Handle mirror_handle;

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  Symbol* name = NULL;
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  Handle       loader;
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  {  MonitorLockerEx ml(this_oop->lock());
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    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;
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        name   = this_oop->unresolved_klass_at(which);
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        loader = Handle(THREAD, this_oop->pool_holder()->class_loader());
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      }
    }
  } // 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) {
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    Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
    guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
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    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
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    oop protection_domain = this_oop->pool_holder()->protection_domain();
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    Handle h_prot (THREAD, protection_domain);
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    Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
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    KlassHandle k;
    if (!HAS_PENDING_EXCEPTION) {
      k = KlassHandle(THREAD, k_oop);
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      // preserve the resolved klass.
      mirror_handle = Handle(THREAD, k_oop->java_mirror());
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      // 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;
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      Symbol* error = PENDING_EXCEPTION->klass()->name();
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      bool throw_orig_error = false;
      {
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        MonitorLockerEx ml(this_oop->lock());
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        // 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);
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          return entry.get_klass();
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        }

        if (!PENDING_EXCEPTION->
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              is_a(SystemDictionary::LinkageError_klass())) {
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          // 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.
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          error = SystemDictionary::find_resolution_error(this_oop, which);
          assert(error != NULL, "checking");
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          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;
    }

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    if (TraceClassResolution && !k()->oop_is_array()) {
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      // 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());
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          Symbol* s = vfst.method()->method_holder()->source_file_name();
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          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",
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                     this_oop->pool_holder()->external_name(),
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                     InstanceKlass::cast(k())->external_name(), source_file, line_number);
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        } else {
          tty->print("RESOLVE %s %s\n",
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                     this_oop->pool_holder()->external_name(),
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                     InstanceKlass::cast(k())->external_name());
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        }
      }
      return k();
    } else {
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      MonitorLockerEx ml(this_oop->lock());
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      // Only updated constant pool - if it is resolved.
      do_resolve = this_oop->tag_at(which).is_unresolved_klass();
      if (do_resolve) {
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        ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data();
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        this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
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        this_oop->klass_at_put(which, k());
      }
    }
  }

  entry = this_oop->resolved_klass_at(which);
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  assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
  return entry.get_klass();
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}


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// Does not update ConstantPool* - to avoid any exception throwing. Used
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// 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
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Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
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  CPSlot entry = this_oop->slot_at(which);
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  if (entry.is_resolved()) {
    assert(entry.get_klass()->is_klass(), "must be");
    return entry.get_klass();
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  } else {
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    assert(entry.is_unresolved(), "must be either symbol or klass");
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    Thread *thread = Thread::current();
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    Symbol* name = entry.get_symbol();
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    oop loader = this_oop->pool_holder()->class_loader();
    oop protection_domain = this_oop->pool_holder()->protection_domain();
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    Handle h_prot (thread, protection_domain);
    Handle h_loader (thread, loader);
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    Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
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    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;
    }
  }
}


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Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
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  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.
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Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
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  int which = this_oop->klass_ref_index_at(index);
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  CPSlot entry = this_oop->slot_at(which);
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  if (entry.is_resolved()) {
    assert(entry.get_klass()->is_klass(), "must be");
    return entry.get_klass();
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  } else {
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    assert(entry.is_unresolved(), "must be either symbol or klass");
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    Symbol*  name  = entry.get_symbol();
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    oop loader = this_oop->pool_holder()->class_loader();
    oop protection_domain = this_oop->pool_holder()->protection_domain();
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    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();
  }
}


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Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
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                                                   int which) {
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  if (cpool->cache() == NULL)  return NULL;  // nothing to load yet
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  int cache_index = decode_cpcache_index(which, true);
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  if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
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    // FIXME: should be an assert
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    if (PrintMiscellaneous && (Verbose||WizardMode)) {
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      tty->print_cr("bad operand %d in:", which); cpool->print();
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    }
    return NULL;
  }
  ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
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  return e->method_if_resolved(cpool);
}


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bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
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  if (cpool->cache() == NULL)  return false;  // nothing to load yet
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  int cache_index = decode_cpcache_index(which, true);
  ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
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  return e->has_appendix();
}

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oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
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  if (cpool->cache() == NULL)  return NULL;  // nothing to load yet
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  int cache_index = decode_cpcache_index(which, true);
  ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
  return e->appendix_if_resolved(cpool);
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}


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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);
}


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Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
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  int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
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  return symbol_at(name_index);
}


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Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
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  int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
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  return symbol_at(signature_index);
}


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int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
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  int i = which;
  if (!uncached && cache() != NULL) {
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    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();
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      pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
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      assert(tag_at(pool_index).is_name_and_type(), "");
      return pool_index;
    }
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    // change byte-ordering and go via cache
    i = remap_instruction_operand_from_cache(which);
  } else {
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    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;
    }
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  }
  assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
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  assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
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  jint ref_index = *int_at_addr(i);
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  return extract_high_short_from_int(ref_index);
}


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int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
  guarantee(!ConstantPool::is_invokedynamic_index(which),
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            "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);
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  return extract_low_short_from_int(ref_index);
}


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int ConstantPool::remap_instruction_operand_from_cache(int operand) {
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  int cpc_index = operand;
  DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
  assert((int)(u2)cpc_index == cpc_index, "clean u2");
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  int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
  return member_index;
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}


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void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
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 if (k->oop_is_instance() || k->oop_is_objArray()) {
    instanceKlassHandle holder (THREAD, this_oop->pool_holder());
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    Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
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    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);
    }
  }
}


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int ConstantPool::name_ref_index_at(int which_nt) {
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  jint ref_index = name_and_type_at(which_nt);
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  return extract_low_short_from_int(ref_index);
}


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int ConstantPool::signature_ref_index_at(int which_nt) {
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  jint ref_index = name_and_type_at(which_nt);
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  return extract_high_short_from_int(ref_index);
}


546
Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
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  return klass_at(klass_ref_index_at(which), CHECK_NULL);
}


551
Symbol* ConstantPool::klass_name_at(int which) {
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  assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
         "Corrupted constant pool");
554
  // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
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  // 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.
557
  CPSlot entry = slot_at(which);
558
  if (entry.is_resolved()) {
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    // Already resolved - return entry's name.
560 561
    assert(entry.get_klass()->is_klass(), "must be");
    return entry.get_klass()->name();
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  } else {
563
    assert(entry.is_unresolved(), "must be either symbol or klass");
564
    return entry.get_symbol();
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  }
}

568
Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
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  jint ref_index = klass_ref_index_at(which);
  return klass_at_noresolve(ref_index);
}

573
Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
574 575 576 577
  jint ref_index = uncached_klass_ref_index_at(which);
  return klass_at_noresolve(ref_index);
}

578 579 580
char* ConstantPool::string_at_noresolve(int which) {
  Symbol* s = unresolved_string_at(which);
  if (s == NULL) {
581
    return (char*)"<pseudo-string>";
582 583
  } else {
    return unresolved_string_at(which)->as_C_string();
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  }
}

587
BasicType ConstantPool::basic_type_for_signature_at(int which) {
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  return FieldType::basic_type(symbol_at(which));
}


592
void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
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  for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
594
    if (this_oop->tag_at(index).is_string()) {
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      this_oop->string_at(index, CHECK);
    }
  }
}

600 601 602 603 604 605 606 607 608 609 610 611 612 613 614
// 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;
}
615

616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642
// 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, "");
643 644 645
  }
}

646 647 648 649 650

// 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) {
651
  oop result_oop = NULL;
652 653 654
  Handle throw_exception;

  if (cache_index == _possible_index_sentinel) {
655
    // It is possible that this constant is one which is cached in the objects.
656 657
    // We'll do a linear search.  This should be OK because this usage is rare.
    assert(index > 0, "valid index");
658
    cache_index = this_oop->cp_to_object_index(index);
659 660 661 662
  }
  assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
  assert(index == _no_index_sentinel || index >= 0, "");

663
  if (cache_index >= 0) {
664
    result_oop = this_oop->resolved_references()->obj_at(cache_index);
665
    if (result_oop != NULL) {
666
      return result_oop;
667
      // That was easy...
668
    }
669
    index = this_oop->object_to_cp_index(cache_index);
670 671
  }

672 673
  jvalue prim_value;  // temp used only in a few cases below

674
  int tag_value = this_oop->tag_at(index).value();
675

676 677 678 679 680 681
  switch (tag_value) {

  case JVM_CONSTANT_UnresolvedClass:
  case JVM_CONSTANT_UnresolvedClassInError:
  case JVM_CONSTANT_Class:
    {
682 683
      assert(cache_index == _no_index_sentinel, "should not have been set");
      Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
684
      // ldc wants the java mirror.
685
      result_oop = resolved->java_mirror();
686 687 688 689
      break;
    }

  case JVM_CONSTANT_String:
690
    assert(cache_index != _no_index_sentinel, "should have been set");
691
    if (this_oop->is_pseudo_string_at(index)) {
692
      result_oop = this_oop->pseudo_string_at(index, cache_index);
693 694
      break;
    }
695
    result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
696 697
    break;

698 699 700 701 702 703 704 705 706 707
  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;
    }

708 709 710 711
  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);
712 713
      Symbol*  name =      this_oop->method_handle_name_ref_at(index);
      Symbol*  signature = this_oop->method_handle_signature_ref_at(index);
714 715 716 717 718
      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;
719
      { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
720 721 722 723 724
        callee = KlassHandle(THREAD, k);
      }
      KlassHandle klass(THREAD, this_oop->pool_holder());
      Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
                                                                   callee, name, signature,
725
                                                                   THREAD);
726
      result_oop = value();
727
      if (HAS_PENDING_EXCEPTION) {
728
        save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
729
      }
730 731 732 733 734
      break;
    }

  case JVM_CONSTANT_MethodType:
    {
735
      Symbol*  signature = this_oop->method_type_signature_at(index);
736 737 738 739 740
      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());
741
      Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
742
      result_oop = value();
743
      if (HAS_PENDING_EXCEPTION) {
744
        save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
745
      }
746 747 748 749
      break;
    }

  case JVM_CONSTANT_Integer:
750
    assert(cache_index == _no_index_sentinel, "should not have been set");
751 752 753 754
    prim_value.i = this_oop->int_at(index);
    result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
    break;

755
  case JVM_CONSTANT_Float:
756
    assert(cache_index == _no_index_sentinel, "should not have been set");
757 758 759 760
    prim_value.f = this_oop->float_at(index);
    result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
    break;

761
  case JVM_CONSTANT_Long:
762
    assert(cache_index == _no_index_sentinel, "should not have been set");
763 764 765 766
    prim_value.j = this_oop->long_at(index);
    result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
    break;

767
  case JVM_CONSTANT_Double:
768
    assert(cache_index == _no_index_sentinel, "should not have been set");
769 770
    prim_value.d = this_oop->double_at(index);
    result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
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    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.
782
    Handle result_handle(THREAD, result_oop);
783 784 785
    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.
786 787 788 789
    // 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.
790 791 792 793 794 795 796
    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;
797 798 799 800 801 802
    }
  } else {
    return result_oop;
  }
}

803 804 805 806 807 808 809
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;
}

810

811
oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848
  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();
}

849 850 851 852 853
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;

854
      Symbol* sym = this_oop->unresolved_string_at(which);
855 856
  str = StringTable::intern(sym, CHECK_(NULL));
  this_oop->string_at_put(which, obj_index, str);
857 858
  assert(java_lang_String::is_instance(str), "must be string");
  return str;
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}


862
bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
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                                                int which) {
864 865
  // Names are interned, so we can compare Symbol*s directly
  Symbol* cp_name = klass_name_at(which);
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  return (cp_name == k->name());
}


870 871 872 873 874
// 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.
875
void ConstantPool::unreference_symbols() {
876 877 878 879 880 881 882
  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();
    }
  }
}
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// Compare this constant pool's entry at index1 to the constant pool
// cp2's entry at index2.
887
bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
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       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
906 907 908 909
    // 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.
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    return false;
  }

  switch (t1) {
  case JVM_CONSTANT_Class:
  {
916 917
    Klass* k1 = klass_at(index1, CHECK_false);
    Klass* k2 = cp2->klass_at(index2, CHECK_false);
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    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:
  {
1013 1014
    Symbol* k1 = unresolved_klass_at(index1);
    Symbol* k2 = cp2->unresolved_klass_at(index2);
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    if (k1 == k2) {
      return true;
    }
  } break;

1020 1021 1022 1023
  case JVM_CONSTANT_MethodType:
  {
    int k1 = method_type_index_at(index1);
    int k2 = cp2->method_type_index_at(index2);
1024 1025
    bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
    if (match) {
1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
      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);
1037 1038
      bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
      if (match) {
1039 1040 1041 1042 1043
        return true;
      }
    }
  } break;

1044 1045
  case JVM_CONSTANT_InvokeDynamic:
  {
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
    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;
1061
      }
1062
      return true;           // got through loop; all elements equal
1063 1064 1065
    }
  } break;

1066
  case JVM_CONSTANT_String:
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  {
1068 1069
    Symbol* s1 = unresolved_string_at(index1);
    Symbol* s2 = cp2->unresolved_string_at(index2);
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    if (s1 == s2) {
      return true;
    }
  } break;

  case JVM_CONSTANT_Utf8:
  {
1077 1078
    Symbol* s1 = symbol_at(index1);
    Symbol* s2 = cp2->symbol_at(index2);
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    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()


1098 1099 1100
void ConstantPool::copy_operands(constantPoolHandle from_cp,
                                 constantPoolHandle to_cp,
                                 TRAPS) {
1101 1102 1103 1104

  int from_oplen = operand_array_length(from_cp->operands());
  int old_oplen  = operand_array_length(to_cp->operands());
  if (from_oplen != 0) {
1105
    ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1106 1107
    // append my operands to the target's operands array
    if (old_oplen == 0) {
1108 1109 1110 1111 1112 1113
      // 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);
1114 1115 1116 1117 1118
    } 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);
1119 1120
      // Use the metaspace for the destination constant pool
      Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1121 1122
      int fillp = 0, len = 0;
      // first part of dest
1123 1124
      Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
                                   new_operands->adr_at(fillp),
1125 1126 1127
                                   (len = old_off) * sizeof(u2));
      fillp += len;
      // first part of src
1128
      Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1129
                                   new_operands->adr_at(fillp),
1130 1131 1132
                                   (len = from_off) * sizeof(u2));
      fillp += len;
      // second part of dest
1133 1134
      Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
                                   new_operands->adr_at(fillp),
1135 1136 1137
                                   (len = old_len - old_off) * sizeof(u2));
      fillp += len;
      // second part of src
1138
      Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1139
                                   new_operands->adr_at(fillp),
1140 1141 1142 1143 1144 1145
                                   (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++) {
1146
        int offset = operand_offset_at(new_operands, old_oplen + j);
1147 1148
        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
1149
        operand_offset_at_put(new_operands, old_oplen + j, offset);
1150 1151 1152
      }

      // replace target operands array with combined array
1153
      to_cp->set_operands(new_operands);
1154 1155
    }
  }
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
} // end copy_operands()


// 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;
    }
  }
  copy_operands(from_cp, to_cp, CHECK);
1187

1188
} // end copy_cp_to_impl()
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// Copy this constant pool's entry at from_i to the constant pool
// to_cp's entry at to_i.
1193
void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1194 1195
                                        constantPoolHandle to_cp, int to_i,
                                        TRAPS) {
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1197 1198
  int tag = from_cp->tag_at(from_i).value();
  switch (tag) {
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  case JVM_CONSTANT_Class:
  {
1201
    Klass* k = from_cp->klass_at(from_i, CHECK);
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    to_cp->klass_at_put(to_i, k);
  } break;

  case JVM_CONSTANT_ClassIndex:
  {
1207
    jint ki = from_cp->klass_index_at(from_i);
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    to_cp->klass_index_at_put(to_i, ki);
  } break;

  case JVM_CONSTANT_Double:
  {
1213
    jdouble d = from_cp->double_at(from_i);
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    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:
  {
1221 1222
    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);
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    to_cp->field_at_put(to_i, class_index, name_and_type_index);
  } break;

  case JVM_CONSTANT_Float:
  {
1228
    jfloat f = from_cp->float_at(from_i);
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    to_cp->float_at_put(to_i, f);
  } break;

  case JVM_CONSTANT_Integer:
  {
1234
    jint i = from_cp->int_at(from_i);
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    to_cp->int_at_put(to_i, i);
  } break;

  case JVM_CONSTANT_InterfaceMethodref:
  {
1240 1241
    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);
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    to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
  } break;

  case JVM_CONSTANT_Long:
  {
1247
    jlong l = from_cp->long_at(from_i);
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    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:
  {
1255 1256
    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);
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    to_cp->method_at_put(to_i, class_index, name_and_type_index);
  } break;

  case JVM_CONSTANT_NameAndType:
  {
1262 1263
    int name_ref_index = from_cp->name_ref_index_at(from_i);
    int signature_ref_index = from_cp->signature_ref_index_at(from_i);
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    to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
  } break;

  case JVM_CONSTANT_StringIndex:
  {
1269
    jint si = from_cp->string_index_at(from_i);
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    to_cp->string_index_at_put(to_i, si);
  } break;

  case JVM_CONSTANT_UnresolvedClass:
  {
1275 1276
    // Can be resolved after checking tag, so check the slot first.
    CPSlot entry = from_cp->slot_at(from_i);
1277 1278
    if (entry.is_resolved()) {
      assert(entry.get_klass()->is_klass(), "must be");
1279
      // Already resolved
1280
      to_cp->klass_at_put(to_i, entry.get_klass());
1281 1282 1283
    } else {
      to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
    }
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  } break;

  case JVM_CONSTANT_UnresolvedClassInError:
  {
1288
    Symbol* k = from_cp->unresolved_klass_at(from_i);
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    to_cp->unresolved_klass_at_put(to_i, k);
    to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
  } break;


1294
  case JVM_CONSTANT_String:
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  {
1296 1297
    Symbol* s = from_cp->unresolved_string_at(from_i);
    to_cp->unresolved_string_at_put(to_i, s);
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  } break;

  case JVM_CONSTANT_Utf8:
  {
1302
    Symbol* s = from_cp->symbol_at(from_i);
1303 1304
    // Need to increase refcount, the old one will be thrown away and deferenced
    s->increment_refcount();
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    to_cp->symbol_at_put(to_i, s);
  } break;

1308 1309
  case JVM_CONSTANT_MethodType:
  {
1310
    jint k = from_cp->method_type_index_at(from_i);
1311 1312 1313 1314 1315
    to_cp->method_type_index_at_put(to_i, k);
  } break;

  case JVM_CONSTANT_MethodHandle:
  {
1316 1317
    int k1 = from_cp->method_handle_ref_kind_at(from_i);
    int k2 = from_cp->method_handle_index_at(from_i);
1318 1319 1320
    to_cp->method_handle_index_at_put(to_i, k1, k2);
  } break;

1321 1322
  case JVM_CONSTANT_InvokeDynamic:
  {
1323 1324 1325 1326
    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);
1327 1328
  } break;

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  // 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.
1345
int ConstantPool::find_matching_entry(int pattern_i,
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      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

1362
const char* ConstantPool::printable_name_at(int which) {
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  constantTag tag = tag_at(which);

1366
  if (tag.is_string()) {
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    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);
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        printf("long         "INT64_FORMAT, (int64_t) *(jlong *) &val);
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        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.
1511
jint ConstantPool::cpool_entry_size(jint idx) {
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  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:
1526
    case JVM_CONSTANT_MethodType:
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      return 3;

1529 1530 1531
    case JVM_CONSTANT_MethodHandle:
      return 4; //tag, ref_kind, ref_index

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    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;

1540
    case JVM_CONSTANT_InvokeDynamic:
1541 1542
      // u1 tag, u2 bsm, u2 nt
      return 5;
1543

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    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.
1556
jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
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                                          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: {
1566
        Symbol* sym = symbol_at(idx);
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        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: {
1574
        Symbol* sym = klass_name_at(idx);
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        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
1595
int ConstantPool::copy_cpool_bytes(int cpool_size,
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                                          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: {
1622
        Symbol* sym = symbol_at(idx);
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        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;
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        Symbol* sym = klass_name_at(idx);
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        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;
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        Symbol* sym = unresolved_string_at(idx);
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        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());
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        DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
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        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;
      }
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      case JVM_CONSTANT_MethodHandle:
      case JVM_CONSTANT_MethodHandleInError: {
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        *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;
      }
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      case JVM_CONSTANT_MethodType:
      case JVM_CONSTANT_MethodTypeInError: {
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        *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;
      }
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      case JVM_CONSTANT_InvokeDynamic: {
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        *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");
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        Bytes::put_Java_u2((address) (bytes+1), idx1);
        Bytes::put_Java_u2((address) (bytes+3), idx2);
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        DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
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        break;
      }
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    }
    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 */


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void ConstantPool::set_on_stack(const bool value) {
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  if (value) {
    _flags |= _on_stack;
  } else {
    _flags &= ~_on_stack;
  }
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  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,
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                   pool_holder()->external_name()));
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  }
#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_preresolution()) st->print(" has_preresolution");
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    if (on_stack()) st->print(" on_stack");
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    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 :
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      if (is_pseudo_string_at(index)) {
        oop anObj = pseudo_string_at(index);
        anObj->print_value_on(st);
        st->print(" {0x%lx}", (address)anObj);
      } else {
        unresolved_string_at(index)->print_value_on(st);
      }
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      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_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) {
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    bool extra = (pool_holder()->constants() != this);
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    if (extra)  st->print(" (extra)");
  }
  if (cache() != NULL) {
    st->print(" cache=" PTR_FORMAT, cache());
  }
}

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#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
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// 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");
  }
}


2004
void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
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  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");
}

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SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
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  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;
}