constantPool.cpp 69.4 KB
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/*
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 * Copyright (c) 1997, 2012, 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"
#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/vmSymbols.hpp"
#include "interpreter/linkResolver.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"
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#include "prims/jvmtiRedefineClasses.hpp"
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#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);
  // only set to non-zero if constant pool is merged by RedefineClasses
  set_orig_length(0);
  set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
  // all fields are initialized; needed for GC
  set_on_stack(false);

  // 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);
}

void ConstantPool::set_flag_at(FlagBit fb) {
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  const int MAX_STATE_CHANGES = 2;
  for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) {
    int oflags = _flags;
    int nflags = oflags | (1 << (int)fb);
    if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags)
      return;
  }
  assert(false, "failed to cmpxchg flags");
  _flags |= (1 << (int)fb);     // better than nothing
}

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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);
    }
  }
}


546
int ConstantPool::name_ref_index_at(int which_nt) {
547
  jint ref_index = name_and_type_at(which_nt);
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  return extract_low_short_from_int(ref_index);
}


552
int ConstantPool::signature_ref_index_at(int which_nt) {
553
  jint ref_index = name_and_type_at(which_nt);
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  return extract_high_short_from_int(ref_index);
}


558
Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
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  return klass_at(klass_ref_index_at(which), CHECK_NULL);
}


563
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");
566
  // 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.
569
  CPSlot entry = slot_at(which);
570
  if (entry.is_resolved()) {
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    // Already resolved - return entry's name.
572 573
    assert(entry.get_klass()->is_klass(), "must be");
    return entry.get_klass()->name();
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  } else {
575
    assert(entry.is_unresolved(), "must be either symbol or klass");
576
    return entry.get_symbol();
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  }
}

580
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);
}

585
Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
586 587 588 589
  jint ref_index = uncached_klass_ref_index_at(which);
  return klass_at_noresolve(ref_index);
}

590 591 592
char* ConstantPool::string_at_noresolve(int which) {
  Symbol* s = unresolved_string_at(which);
  if (s == NULL) {
593
    return (char*)"<pseudo-string>";
594 595
  } else {
    return unresolved_string_at(which)->as_C_string();
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  }
}

599
BasicType ConstantPool::basic_type_for_signature_at(int which) {
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  return FieldType::basic_type(symbol_at(which));
}


604
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
606
    if (this_oop->tag_at(index).is_string()) {
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      this_oop->string_at(index, CHECK);
    }
  }
}

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// 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;
}
627

628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654
// 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, "");
655 656 657
  }
}

658 659 660 661 662

// 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) {
663
  oop result_oop = NULL;
664 665 666
  Handle throw_exception;

  if (cache_index == _possible_index_sentinel) {
667
    // It is possible that this constant is one which is cached in the objects.
668 669
    // We'll do a linear search.  This should be OK because this usage is rare.
    assert(index > 0, "valid index");
670
    cache_index = this_oop->cp_to_object_index(index);
671 672 673 674
  }
  assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
  assert(index == _no_index_sentinel || index >= 0, "");

675
  if (cache_index >= 0) {
676
    result_oop = this_oop->resolved_references()->obj_at(cache_index);
677
    if (result_oop != NULL) {
678
      return result_oop;
679
      // That was easy...
680
    }
681
    index = this_oop->object_to_cp_index(cache_index);
682 683
  }

684 685
  jvalue prim_value;  // temp used only in a few cases below

686
  int tag_value = this_oop->tag_at(index).value();
687

688 689 690 691 692 693
  switch (tag_value) {

  case JVM_CONSTANT_UnresolvedClass:
  case JVM_CONSTANT_UnresolvedClassInError:
  case JVM_CONSTANT_Class:
    {
694 695
      assert(cache_index == _no_index_sentinel, "should not have been set");
      Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
696
      // ldc wants the java mirror.
697
      result_oop = resolved->java_mirror();
698 699 700 701
      break;
    }

  case JVM_CONSTANT_String:
702
    assert(cache_index != _no_index_sentinel, "should have been set");
703
    if (this_oop->is_pseudo_string_at(index)) {
704
      result_oop = this_oop->pseudo_string_at(index, cache_index);
705 706
      break;
    }
707
    result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
708 709 710 711 712 713
    break;

  case JVM_CONSTANT_Object:
    result_oop = this_oop->object_at(index);
    break;

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  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;
    }

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  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);
728 729
      Symbol*  name =      this_oop->method_handle_name_ref_at(index);
      Symbol*  signature = this_oop->method_handle_signature_ref_at(index);
730 731 732 733 734
      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;
735
      { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
736 737 738 739 740
        callee = KlassHandle(THREAD, k);
      }
      KlassHandle klass(THREAD, this_oop->pool_holder());
      Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
                                                                   callee, name, signature,
741
                                                                   THREAD);
742
      result_oop = value();
743
      if (HAS_PENDING_EXCEPTION) {
744
        save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
745
      }
746 747 748 749 750
      break;
    }

  case JVM_CONSTANT_MethodType:
    {
751
      Symbol*  signature = this_oop->method_type_signature_at(index);
752 753 754 755 756
      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());
757
      Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
758
      result_oop = value();
759
      if (HAS_PENDING_EXCEPTION) {
760
        save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
761
      }
762 763 764 765
      break;
    }

  case JVM_CONSTANT_Integer:
766
    assert(cache_index == _no_index_sentinel, "should not have been set");
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    prim_value.i = this_oop->int_at(index);
    result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
    break;

771
  case JVM_CONSTANT_Float:
772
    assert(cache_index == _no_index_sentinel, "should not have been set");
773 774 775 776
    prim_value.f = this_oop->float_at(index);
    result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
    break;

777
  case JVM_CONSTANT_Long:
778
    assert(cache_index == _no_index_sentinel, "should not have been set");
779 780 781 782
    prim_value.j = this_oop->long_at(index);
    result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
    break;

783
  case JVM_CONSTANT_Double:
784
    assert(cache_index == _no_index_sentinel, "should not have been set");
785 786
    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.
798
    Handle result_handle(THREAD, result_oop);
799 800 801
    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.
802 803 804 805
    // 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.
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    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;
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    }
  } else {
    return result_oop;
  }
}

819 820 821 822 823 824 825
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;
}

826

827
oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864
  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();
}

865 866 867 868 869
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;

870
      Symbol* sym = this_oop->unresolved_string_at(which);
871 872
  str = StringTable::intern(sym, CHECK_(NULL));
  this_oop->string_at_put(which, obj_index, str);
873 874
  assert(java_lang_String::is_instance(str), "must be string");
  return str;
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}


878
bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
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                                                int which) {
880 881
  // 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());
}


886 887 888 889 890
// 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.
891
void ConstantPool::unreference_symbols() {
892 893 894 895 896 897 898
  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.
903
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
922 923 924 925
    // 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:
  {
932 933
    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:
  {
1029 1030
    Symbol* k1 = unresolved_klass_at(index1);
    Symbol* k2 = cp2->unresolved_klass_at(index2);
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    if (k1 == k2) {
      return true;
    }
  } break;

1036 1037 1038 1039
  case JVM_CONSTANT_MethodType:
  {
    int k1 = method_type_index_at(index1);
    int k2 = cp2->method_type_index_at(index2);
1040 1041
    bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
    if (match) {
1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
      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);
1053 1054
      bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
      if (match) {
1055 1056 1057 1058 1059
        return true;
      }
    }
  } break;

1060 1061
  case JVM_CONSTANT_InvokeDynamic:
  {
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
    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;
1077
      }
1078
      return true;           // got through loop; all elements equal
1079 1080 1081
    }
  } break;

1082
  case JVM_CONSTANT_String:
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  {
1084 1085
    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:
  {
1093 1094
    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()


// 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.
1117
void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
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       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 */ ) {
1123
    copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
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1125
    switch (from_cp->tag_at(src_i).value()) {
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    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;
    }
  }
1140 1141 1142 1143

  int from_oplen = operand_array_length(from_cp->operands());
  int old_oplen  = operand_array_length(to_cp->operands());
  if (from_oplen != 0) {
1144
    ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1145 1146
    // append my operands to the target's operands array
    if (old_oplen == 0) {
1147 1148 1149 1150 1151 1152
      // 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);
1153 1154 1155 1156 1157
    } 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);
1158 1159
      // Use the metaspace for the destination constant pool
      Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1160 1161
      int fillp = 0, len = 0;
      // first part of dest
1162 1163
      Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
                                   new_operands->adr_at(fillp),
1164 1165 1166
                                   (len = old_off) * sizeof(u2));
      fillp += len;
      // first part of src
1167 1168
      Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
                                   new_operands->adr_at(fillp),
1169 1170 1171
                                   (len = from_off) * sizeof(u2));
      fillp += len;
      // second part of dest
1172 1173
      Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
                                   new_operands->adr_at(fillp),
1174 1175 1176
                                   (len = old_len - old_off) * sizeof(u2));
      fillp += len;
      // second part of src
1177 1178
      Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(from_off),
                                   new_operands->adr_at(fillp),
1179 1180 1181 1182 1183 1184
                                   (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++) {
1185
        int offset = operand_offset_at(new_operands, old_oplen + j);
1186 1187
        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
1188
        operand_offset_at_put(new_operands, old_oplen + j, offset);
1189 1190 1191
      }

      // replace target operands array with combined array
1192
      to_cp->set_operands(new_operands);
1193 1194 1195
    }
  }

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} // end copy_cp_to()


// Copy this constant pool's entry at from_i to the constant pool
// to_cp's entry at to_i.
1201
void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1202 1203
                                        constantPoolHandle to_cp, int to_i,
                                        TRAPS) {
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1205 1206
  int tag = from_cp->tag_at(from_i).value();
  switch (tag) {
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  case JVM_CONSTANT_Class:
  {
1209
    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:
  {
1215
    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:
  {
1221
    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:
  {
1229 1230
    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:
  {
1236
    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:
  {
1242
    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:
  {
1248 1249
    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:
  {
1255
    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:
  {
1263 1264
    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:
  {
1270 1271
    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:
  {
1277
    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:
  {
1283 1284
    // Can be resolved after checking tag, so check the slot first.
    CPSlot entry = from_cp->slot_at(from_i);
1285 1286
    if (entry.is_resolved()) {
      assert(entry.get_klass()->is_klass(), "must be");
1287
      // Already resolved
1288
      to_cp->klass_at_put(to_i, entry.get_klass());
1289 1290 1291
    } else {
      to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
    }
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  } break;

  case JVM_CONSTANT_UnresolvedClassInError:
  {
1296
    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;


1302
  case JVM_CONSTANT_String:
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  {
1304 1305
    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:
  {
1310
    Symbol* s = from_cp->symbol_at(from_i);
1311 1312
    // 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;

1316 1317
  case JVM_CONSTANT_MethodType:
  {
1318
    jint k = from_cp->method_type_index_at(from_i);
1319 1320 1321 1322 1323
    to_cp->method_type_index_at_put(to_i, k);
  } break;

  case JVM_CONSTANT_MethodHandle:
  {
1324 1325
    int k1 = from_cp->method_handle_ref_kind_at(from_i);
    int k2 = from_cp->method_handle_index_at(from_i);
1326 1327 1328
    to_cp->method_handle_index_at_put(to_i, k1, k2);
  } break;

1329 1330
  case JVM_CONSTANT_InvokeDynamic:
  {
1331 1332 1333 1334
    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);
1335 1336
  } 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.
1353
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

1370
const char* ConstantPool::printable_name_at(int which) {
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  constantTag tag = tag_at(which);

1374
  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.
1519
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:
1534
    case JVM_CONSTANT_MethodType:
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      return 3;

1537 1538 1539
    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;

1548
    case JVM_CONSTANT_InvokeDynamic:
1549 1550
      // u1 tag, u2 bsm, u2 nt
      return 5;
1551

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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.
1564
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: {
1574
        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: {
1582
        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
1603
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: {
1630
        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) {
  _on_stack = value;
  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_pseudo_string()) st->print(" has_pseudo_string");
    if (has_invokedynamic()) st->print(" has_invokedynamic");
    if (has_preresolution()) st->print(" has_preresolution");
    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) {
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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());
  }
}


// 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");
  }
}


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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");
}

2017
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;
}