truffle: src/share/vm/oops/constantPool.cpp comparison

comparison src/share/vm/oops/constantPool.cpp @ 6725:da91efe96a93

6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>

author	coleenp
date	Sat, 01 Sep 2012 13:25:18 -0400
parents	src/share/vm/oops/constantPoolOop.cpp@1d7922586cf6
children	fa6e618671d7

comparison

equal deleted inserted replaced

-:36d1d483d5d6
+:da91efe96a93
+/*
+* Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*
+*/
+#include "precompiled.hpp"
+#include "classfile/classLoaderData.hpp"
+#include "classfile/javaClasses.hpp"
+#include "classfile/symbolTable.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "classfile/vmSymbols.hpp"
+#include "interpreter/linkResolver.hpp"
+#include "memory/metadataFactory.hpp"
+#include "memory/oopFactory.hpp"
+#include "oops/constantPool.hpp"
+#include "oops/instanceKlass.hpp"
+#include "oops/objArrayKlass.hpp"
+#include "prims/jvmtiRedefineClasses.hpp"
+#include "runtime/fieldType.hpp"
+#include "runtime/init.hpp"
+#include "runtime/javaCalls.hpp"
+#include "runtime/signature.hpp"
+#include "runtime/vframe.hpp"
+ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
+// Tags are RW but comment below applies to tags also.
+Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
+int size = ConstantPool::size(length);
+// CDS considerations:
+// Allocate read-write but may be able to move to read-only at dumping time
+// if all the klasses are resolved.  The only other field that is writable is
+// the resolved_references array, which is recreated at startup time.
+// But that could be moved to InstanceKlass (although a pain to access from
+// assembly code).  Maybe it could be moved to the cpCache which is RW.
+return new (loader_data, size, false, THREAD) ConstantPool(tags);
+}
+ConstantPool::ConstantPool(Array<u1>* tags) {
+set_length(tags->length());
+set_tags(NULL);
+set_cache(NULL);
+set_reference_map(NULL);
+set_resolved_references(NULL);
+set_operands(NULL);
+set_pool_holder(NULL);
+set_flags(0);
+// only set to non-zero if constant pool is merged by RedefineClasses
+set_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) {
+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
+}
+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) {
+if (SystemDictionary::Object_klass_loaded()) {
+// Recreate the object array and add to ClassLoaderData.
+int map_length = resolved_reference_length();
+if (map_length > 0) {
+objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
+Handle refs_handle (THREAD, (oop)stom);  // must handleize.
+ClassLoaderData* loader_data = pool_holder()->class_loader_data();
+set_resolved_references(loader_data->add_handle(refs_handle));
+}
+// Also need to recreate the mutex.  Make sure this matches the constructor
+set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
+}
+}
+void ConstantPool::remove_unshareable_info() {
+// Resolved references are not in the shared archive.
+// Save the length for restoration.  It is not necessarily the same length
+// as reference_map.length() if invokedynamic is saved.
+set_resolved_reference_length(
+resolved_references() != NULL ? resolved_references()->length() : 0);
+set_resolved_references(NULL);
+set_lock(NULL);
+}
+int ConstantPool::cp_to_object_index(int cp_index) {
+// this is harder don't do this so much.
+for (int i = 0; i< reference_map()->length(); i++) {
+if (reference_map()->at(i) == cp_index) return i;
+// Zero entry is divider between constant pool indices for strings,
+// method handles and method types. After that the index is a constant
+// pool cache index for invokedynamic.  Stop when zero (which can never
+// be a constant pool index)
+if (reference_map()->at(i) == 0) break;
+}
+// We might not find the index.
+return _no_index_sentinel;
+}
+Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
+// A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
+// It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
+// tag is not updated atomicly.
+CPSlot entry = this_oop->slot_at(which);
+if (entry.is_resolved()) {
+assert(entry.get_klass()->is_klass(), "must be");
+// Already resolved - return entry.
+return entry.get_klass();
+}
+// Acquire lock on constant oop while doing update. After we get the lock, we check if another object
+// already has updated the object
+assert(THREAD->is_Java_thread(), "must be a Java thread");
+bool do_resolve = false;
+bool in_error = false;
+// Create a handle for the mirror. This will preserve the resolved class
+// until the loader_data is registered.
+Handle mirror_handle;
+Symbol* name = NULL;
+Handle       loader;
+{  MonitorLockerEx ml(this_oop->lock());
+if (this_oop->tag_at(which).is_unresolved_klass()) {
+if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
+in_error = true;
+} else {
+do_resolve = true;
+name   = this_oop->unresolved_klass_at(which);
+loader = Handle(THREAD, InstanceKlass::cast(this_oop->pool_holder())->class_loader());
+}
+}
+} // unlocking constantPool
+// The original attempt to resolve this constant pool entry failed so find the
+// original error and throw it again (JVMS 5.4.3).
+if (in_error) {
+Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
+guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
+ResourceMark rm;
+// exception text will be the class name
+const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
+THROW_MSG_0(error, className);
+}
+if (do_resolve) {
+// this_oop must be unlocked during resolve_or_fail
+oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
+Handle h_prot (THREAD, protection_domain);
+Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
+KlassHandle k;
+if (!HAS_PENDING_EXCEPTION) {
+k = KlassHandle(THREAD, k_oop);
+// preserve the resolved klass.
+mirror_handle = Handle(THREAD, k_oop->java_mirror());
+// Do access check for klasses
+verify_constant_pool_resolve(this_oop, k, THREAD);
+}
+// Failed to resolve class. We must record the errors so that subsequent attempts
+// to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
+if (HAS_PENDING_EXCEPTION) {
+ResourceMark rm;
+Symbol* error = PENDING_EXCEPTION->klass()->name();
+bool throw_orig_error = false;
+{
+MonitorLockerEx ml(this_oop->lock());
+// some other thread has beaten us and has resolved the class.
+if (this_oop->tag_at(which).is_klass()) {
+CLEAR_PENDING_EXCEPTION;
+entry = this_oop->resolved_klass_at(which);
+return entry.get_klass();
+}
+if (!PENDING_EXCEPTION->
+is_a(SystemDictionary::LinkageError_klass())) {
+// Just throw the exception and don't prevent these classes from
+// being loaded due to virtual machine errors like StackOverflow
+// and OutOfMemoryError, etc, or if the thread was hit by stop()
+// Needs clarification to section 5.4.3 of the VM spec (see 6308271)
+}
+else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
+SystemDictionary::add_resolution_error(this_oop, which, error);
+this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
+} else {
+// some other thread has put the class in error state.
+error = SystemDictionary::find_resolution_error(this_oop, which);
+assert(error != NULL, "checking");
+throw_orig_error = true;
+}
+} // unlocked
+if (throw_orig_error) {
+CLEAR_PENDING_EXCEPTION;
+ResourceMark rm;
+const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
+THROW_MSG_0(error, className);
+}
+return 0;
+}
+if (TraceClassResolution && !k()->oop_is_array()) {
+// skip resolving the constant pool so that this code get's
+// called the next time some bytecodes refer to this class.
+ResourceMark rm;
+int line_number = -1;
+const char * source_file = NULL;
+if (JavaThread::current()->has_last_Java_frame()) {
+// try to identify the method which called this function.
+vframeStream vfst(JavaThread::current());
+if (!vfst.at_end()) {
+line_number = vfst.method()->line_number_from_bci(vfst.bci());
+Symbol* s = InstanceKlass::cast(vfst.method()->method_holder())->source_file_name();
+if (s != NULL) {
+source_file = s->as_C_string();
+}
+}
+}
+if (k() != this_oop->pool_holder()) {
+// only print something if the classes are different
+if (source_file != NULL) {
+tty->print("RESOLVE %s %s %s:%d\n",
+InstanceKlass::cast(this_oop->pool_holder())->external_name(),
+InstanceKlass::cast(k())->external_name(), source_file, line_number);
+} else {
+tty->print("RESOLVE %s %s\n",
+InstanceKlass::cast(this_oop->pool_holder())->external_name(),
+InstanceKlass::cast(k())->external_name());
+}
+}
+return k();
+} else {
+MonitorLockerEx ml(this_oop->lock());
+// Only updated constant pool - if it is resolved.
+do_resolve = this_oop->tag_at(which).is_unresolved_klass();
+if (do_resolve) {
+ClassLoaderData* this_key = InstanceKlass::cast(this_oop->pool_holder())->class_loader_data();
+if (!this_key->is_the_null_class_loader_data()) {
+this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
+}
+this_oop->klass_at_put(which, k());
+}
+}
+}
+entry = this_oop->resolved_klass_at(which);
+assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
+return entry.get_klass();
+}
+// Does not update ConstantPool* - to avoid any exception throwing. Used
+// by compiler and exception handling.  Also used to avoid classloads for
+// instanceof operations. Returns NULL if the class has not been loaded or
+// if the verification of constant pool failed
+Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
+CPSlot entry = this_oop->slot_at(which);
+if (entry.is_resolved()) {
+assert(entry.get_klass()->is_klass(), "must be");
+return entry.get_klass();
+} else {
+assert(entry.is_unresolved(), "must be either symbol or klass");
+Thread *thread = Thread::current();
+Symbol* name = entry.get_symbol();
+oop loader = InstanceKlass::cast(this_oop->pool_holder())->class_loader();
+oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
+Handle h_prot (thread, protection_domain);
+Handle h_loader (thread, loader);
+Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
+if (k != NULL) {
+// Make sure that resolving is legal
+EXCEPTION_MARK;
+KlassHandle klass(THREAD, k);
+// return NULL if verification fails
+verify_constant_pool_resolve(this_oop, klass, THREAD);
+if (HAS_PENDING_EXCEPTION) {
+CLEAR_PENDING_EXCEPTION;
+return NULL;
+}
+return klass();
+} else {
+return k;
+}
+}
+}
+Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
+return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
+}
+// This is an interface for the compiler that allows accessing non-resolved entries
+// in the constant pool - but still performs the validations tests. Must be used
+// in a pre-parse of the compiler - to determine what it can do and not do.
+// Note: We cannot update the ConstantPool from the vm_thread.
+Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
+int which = this_oop->klass_ref_index_at(index);
+CPSlot entry = this_oop->slot_at(which);
+if (entry.is_resolved()) {
+assert(entry.get_klass()->is_klass(), "must be");
+return entry.get_klass();
+} else {
+assert(entry.is_unresolved(), "must be either symbol or klass");
+Symbol*  name  = entry.get_symbol();
+oop loader = InstanceKlass::cast(this_oop->pool_holder())->class_loader();
+oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
+Handle h_loader(THREAD, loader);
+Handle h_prot  (THREAD, protection_domain);
+KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
+// Do access check for klasses
+if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
+return k();
+}
+}
+Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
+int which) {
+if (cpool->cache() == NULL)  return NULL;  // nothing to load yet
+int cache_index = decode_cpcache_index(which, true);
+if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
+// FIXME: should be an assert
+if (PrintMiscellaneous && (Verbose||WizardMode)) {
+tty->print_cr("bad operand %d in:", which); cpool->print();
+}
+return NULL;
+}
+ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
+return e->method_if_resolved(cpool);
+}
+bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
+if (cpool->cache() == NULL)  return false;  // nothing to load yet
+int cache_index = decode_cpcache_index(which, true);
+ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
+return e->has_appendix();
+}
+oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
+if (cpool->cache() == NULL)  return NULL;  // nothing to load yet
+int cache_index = decode_cpcache_index(which, true);
+ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
+return e->appendix_if_resolved(cpool);
+}
+Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
+int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
+return symbol_at(name_index);
+}
+Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
+int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
+return symbol_at(signature_index);
+}
+int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
+int i = which;
+if (!uncached && cache() != NULL) {
+if (ConstantPool::is_invokedynamic_index(which)) {
+// Invokedynamic index is index into resolved_references
+int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
+pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
+assert(tag_at(pool_index).is_name_and_type(), "");
+return pool_index;
+}
+// change byte-ordering and go via cache
+i = remap_instruction_operand_from_cache(which);
+} else {
+if (tag_at(which).is_invoke_dynamic()) {
+int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
+assert(tag_at(pool_index).is_name_and_type(), "");
+return pool_index;
+}
+}
+assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
+assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
+jint ref_index = *int_at_addr(i);
+return extract_high_short_from_int(ref_index);
+}
+int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
+guarantee(!ConstantPool::is_invokedynamic_index(which),
+"an invokedynamic instruction does not have a klass");
+int i = which;
+if (!uncached && cache() != NULL) {
+// change byte-ordering and go via cache
+i = remap_instruction_operand_from_cache(which);
+}
+assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
+jint ref_index = *int_at_addr(i);
+return extract_low_short_from_int(ref_index);
+}
+int ConstantPool::remap_instruction_operand_from_cache(int operand) {
+int cpc_index = operand;
+DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
+assert((int)(u2)cpc_index == cpc_index, "clean u2");
+int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
+return member_index;
+}
+void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
+if (k->oop_is_instance() || k->oop_is_objArray()) {
+instanceKlassHandle holder (THREAD, this_oop->pool_holder());
+Klass* elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass();
+KlassHandle element (THREAD, elem_oop);
+// The element type could be a typeArray - we only need the access check if it is
+// an reference to another class
+if (element->oop_is_instance()) {
+LinkResolver::check_klass_accessability(holder, element, CHECK);
+}
+}
+}
+int ConstantPool::name_ref_index_at(int which_nt) {
+jint ref_index = name_and_type_at(which_nt);
+return extract_low_short_from_int(ref_index);
+}
+int ConstantPool::signature_ref_index_at(int which_nt) {
+jint ref_index = name_and_type_at(which_nt);
+return extract_high_short_from_int(ref_index);
+}
+Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
+return klass_at(klass_ref_index_at(which), CHECK_NULL);
+}
+Symbol* ConstantPool::klass_name_at(int which) {
+assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
+"Corrupted constant pool");
+// A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
+// It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
+// tag is not updated atomicly.
+CPSlot entry = slot_at(which);
+if (entry.is_resolved()) {
+// Already resolved - return entry's name.
+assert(entry.get_klass()->is_klass(), "must be");
+return entry.get_klass()->name();
+} else {
+assert(entry.is_unresolved(), "must be either symbol or klass");
+return entry.get_symbol();
+}
+}
+Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
+jint ref_index = klass_ref_index_at(which);
+return klass_at_noresolve(ref_index);
+}
+Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
+jint ref_index = uncached_klass_ref_index_at(which);
+return klass_at_noresolve(ref_index);
+}
+char* ConstantPool::string_at_noresolve(int which) {
+Symbol* s = unresolved_string_at(which);
+if (s == NULL) {
+return (char*)"<pseudo-string>";
+} else {
+return unresolved_string_at(which)->as_C_string();
+}
+}
+BasicType ConstantPool::basic_type_for_signature_at(int which) {
+return FieldType::basic_type(symbol_at(which));
+}
+void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
+for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
+if (this_oop->tag_at(index).is_string()) {
+this_oop->string_at(index, CHECK);
+}
+}
+}
+// Resolve all the classes in the constant pool.  If they are all resolved,
+// the constant pool is read-only.  Enhancement: allocate cp entries to
+// another metaspace, and copy to read-only or read-write space if this
+// bit is set.
+bool ConstantPool::resolve_class_constants(TRAPS) {
+constantPoolHandle cp(THREAD, this);
+for (int index = 1; index < length(); index++) { // Index 0 is unused
+if (tag_at(index).is_unresolved_klass() &&
+klass_at_if_loaded(cp, index) == NULL) {
+return false;
+}
+}
+// set_preresolution(); or some bit for future use
+return true;
+}
+// If resolution for MethodHandle or MethodType fails, save the exception
+// in the resolution error table, so that the same exception is thrown again.
+void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which,
+int tag, TRAPS) {
+ResourceMark rm;
+Symbol* error = PENDING_EXCEPTION->klass()->name();
+MonitorLockerEx ml(this_oop->lock());  // lock cpool to change tag.
+int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
+JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
+if (!PENDING_EXCEPTION->
+is_a(SystemDictionary::LinkageError_klass())) {
+// Just throw the exception and don't prevent these classes from
+// being loaded due to virtual machine errors like StackOverflow
+// and OutOfMemoryError, etc, or if the thread was hit by stop()
+// Needs clarification to section 5.4.3 of the VM spec (see 6308271)
+} else if (this_oop->tag_at(which).value() != error_tag) {
+SystemDictionary::add_resolution_error(this_oop, which, error);
+this_oop->tag_at_put(which, error_tag);
+} else {
+// some other thread has put the class in error state.
+error = SystemDictionary::find_resolution_error(this_oop, which);
+assert(error != NULL, "checking");
+CLEAR_PENDING_EXCEPTION;
+THROW_MSG(error, "");
+}
+}
+// Called to resolve constants in the constant pool and return an oop.
+// Some constant pool entries cache their resolved oop. This is also
+// called to create oops from constants to use in arguments for invokedynamic
+oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
+oop result_oop = NULL;
+Handle throw_exception;
+if (cache_index == _possible_index_sentinel) {
+// It is possible that this constant is one which is cached in the objects.
+// We'll do a linear search.  This should be OK because this usage is rare.
+assert(index > 0, "valid index");
+cache_index = this_oop->cp_to_object_index(index);
+}
+assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
+assert(index == _no_index_sentinel || index >= 0, "");
+if (cache_index >= 0) {
+result_oop = this_oop->resolved_references()->obj_at(cache_index);
+if (result_oop != NULL) {
+return result_oop;
+// That was easy...
+}
+index = this_oop->object_to_cp_index(cache_index);
+}
+jvalue prim_value;  // temp used only in a few cases below
+int tag_value = this_oop->tag_at(index).value();
+switch (tag_value) {
+case JVM_CONSTANT_UnresolvedClass:
+case JVM_CONSTANT_UnresolvedClassInError:
+case JVM_CONSTANT_Class:
+{
+assert(cache_index == _no_index_sentinel, "should not have been set");
+Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
+// ldc wants the java mirror.
+result_oop = resolved->java_mirror();
+break;
+}
+case JVM_CONSTANT_String:
+assert(cache_index != _no_index_sentinel, "should have been set");
+if (this_oop->is_pseudo_string_at(index)) {
+result_oop = this_oop->pseudo_string_at(index, cache_index);
+break;
+}
+result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
+break;
+case JVM_CONSTANT_Object:
+result_oop = this_oop->object_at(index);
+break;
+case JVM_CONSTANT_MethodHandleInError:
+case JVM_CONSTANT_MethodTypeInError:
+{
+Symbol* error = SystemDictionary::find_resolution_error(this_oop, index);
+guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
+ResourceMark rm;
+THROW_MSG_0(error, "");
+break;
+}
+case JVM_CONSTANT_MethodHandle:
+{
+int ref_kind                 = this_oop->method_handle_ref_kind_at(index);
+int callee_index             = this_oop->method_handle_klass_index_at(index);
+Symbol*  name =      this_oop->method_handle_name_ref_at(index);
+Symbol*  signature = this_oop->method_handle_signature_ref_at(index);
+if (PrintMiscellaneous)
+tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
+ref_kind, index, this_oop->method_handle_index_at(index),
+callee_index, name->as_C_string(), signature->as_C_string());
+KlassHandle callee;
+{ Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
+callee = KlassHandle(THREAD, k);
+}
+KlassHandle klass(THREAD, this_oop->pool_holder());
+Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
+callee, name, signature,
+THREAD);
+result_oop = value();
+if (HAS_PENDING_EXCEPTION) {
+save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
+}
+break;
+}
+case JVM_CONSTANT_MethodType:
+{
+Symbol*  signature = this_oop->method_type_signature_at(index);
+if (PrintMiscellaneous)
+tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
+index, this_oop->method_type_index_at(index),
+signature->as_C_string());
+KlassHandle klass(THREAD, this_oop->pool_holder());
+Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
+result_oop = value();
+if (HAS_PENDING_EXCEPTION) {
+save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
+}
+break;
+}
+case JVM_CONSTANT_Integer:
+assert(cache_index == _no_index_sentinel, "should not have been set");
+prim_value.i = this_oop->int_at(index);
+result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
+break;
+case JVM_CONSTANT_Float:
+assert(cache_index == _no_index_sentinel, "should not have been set");
+prim_value.f = this_oop->float_at(index);
+result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
+break;
+case JVM_CONSTANT_Long:
+assert(cache_index == _no_index_sentinel, "should not have been set");
+prim_value.j = this_oop->long_at(index);
+result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
+break;
+case JVM_CONSTANT_Double:
+assert(cache_index == _no_index_sentinel, "should not have been set");
+prim_value.d = this_oop->double_at(index);
+result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
+break;
+default:
+DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
+this_oop(), index, cache_index, tag_value) );
+assert(false, "unexpected constant tag");
+break;
+}
+if (cache_index >= 0) {
+// Cache the oop here also.
+Handle result_handle(THREAD, result_oop);
+MonitorLockerEx ml(this_oop->lock());  // don't know if we really need this
+oop result = this_oop->resolved_references()->obj_at(cache_index);
+// Benign race condition:  resolved_references may already be filled in while we were trying to lock.
+// The important thing here is that all threads pick up the same result.
+// It doesn't matter which racing thread wins, as long as only one
+// result is used by all threads, and all future queries.
+// That result may be either a resolved constant or a failure exception.
+if (result == NULL) {
+this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
+return result_handle();
+} else {
+// Return the winning thread's result.  This can be different than
+// result_handle() for MethodHandles.
+return result;
+}
+} else {
+return result_oop;
+}
+}
+oop ConstantPool::uncached_string_at(int which, TRAPS) {
+Symbol* sym = unresolved_string_at(which);
+oop str = StringTable::intern(sym, CHECK_(NULL));
+assert(java_lang_String::is_instance(str), "must be string");
+return str;
+}
+oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
+assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
+Handle bsm;
+int argc;
+{
+// JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
+// The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
+// It is accompanied by the optional arguments.
+int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
+oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
+if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
+THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
+}
+// Extract the optional static arguments.
+argc = this_oop->invoke_dynamic_argument_count_at(index);
+if (argc == 0)  return bsm_oop;
+bsm = Handle(THREAD, bsm_oop);
+}
+objArrayHandle info;
+{
+objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
+info = objArrayHandle(THREAD, info_oop);
+}
+info->obj_at_put(0, bsm());
+for (int i = 0; i < argc; i++) {
+int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
+oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
+info->obj_at_put(1+i, arg_oop);
+}
+return info();
+}
+oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
+// If the string has already been interned, this entry will be non-null
+oop str = this_oop->resolved_references()->obj_at(obj_index);
+if (str != NULL) return str;
+Symbol* sym = this_oop->unresolved_string_at(which);
+str = StringTable::intern(sym, CHECK_(NULL));
+this_oop->string_at_put(which, obj_index, str);
+assert(java_lang_String::is_instance(str), "must be string");
+return str;
+}
+bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
+int which) {
+// Names are interned, so we can compare Symbol*s directly
+Symbol* cp_name = klass_name_at(which);
+return (cp_name == k->name());
+}
+// Iterate over symbols and decrement ones which are Symbol*s.
+// This is done during GC so do not need to lock constantPool unless we
+// have per-thread safepoints.
+// Only decrement the UTF8 symbols. Unresolved classes and strings point to
+// these symbols but didn't increment the reference count.
+void ConstantPool::unreference_symbols() {
+for (int index = 1; index < length(); index++) { // Index 0 is unused
+constantTag tag = tag_at(index);
+if (tag.is_symbol()) {
+symbol_at(index)->decrement_refcount();
+}
+}
+}
+// Compare this constant pool's entry at index1 to the constant pool
+// cp2's entry at index2.
+bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
+int index2, TRAPS) {
+jbyte t1 = tag_at(index1).value();
+jbyte t2 = cp2->tag_at(index2).value();
+// JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
+// when comparing
+if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
+t1 = JVM_CONSTANT_UnresolvedClass;
+}
+if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
+t2 = JVM_CONSTANT_UnresolvedClass;
+}
+if (t1 != t2) {
+// Not the same entry type so there is nothing else to check. Note
+// that this style of checking will consider resolved/unresolved
+// class pairs as different.
+// From the ConstantPool* API point of view, this is correct
+// behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
+// plays out in the context of ConstantPool* merging.
+return false;
+}
+switch (t1) {
+case JVM_CONSTANT_Class:
+{
+Klass* k1 = klass_at(index1, CHECK_false);
+Klass* k2 = cp2->klass_at(index2, CHECK_false);
+if (k1 == k2) {
+return true;
+}
+} break;
+case JVM_CONSTANT_ClassIndex:
+{
+int recur1 = klass_index_at(index1);
+int recur2 = cp2->klass_index_at(index2);
+bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
+if (match) {
+return true;
+}
+} break;
+case JVM_CONSTANT_Double:
+{
+jdouble d1 = double_at(index1);
+jdouble d2 = cp2->double_at(index2);
+if (d1 == d2) {
+return true;
+}
+} break;
+case JVM_CONSTANT_Fieldref:
+case JVM_CONSTANT_InterfaceMethodref:
+case JVM_CONSTANT_Methodref:
+{
+int recur1 = uncached_klass_ref_index_at(index1);
+int recur2 = cp2->uncached_klass_ref_index_at(index2);
+bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
+if (match) {
+recur1 = uncached_name_and_type_ref_index_at(index1);
+recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
+match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
+if (match) {
+return true;
+}
+}
+} break;
+case JVM_CONSTANT_Float:
+{
+jfloat f1 = float_at(index1);
+jfloat f2 = cp2->float_at(index2);
+if (f1 == f2) {
+return true;
+}
+} break;
+case JVM_CONSTANT_Integer:
+{
+jint i1 = int_at(index1);
+jint i2 = cp2->int_at(index2);
+if (i1 == i2) {
+return true;
+}
+} break;
+case JVM_CONSTANT_Long:
+{
+jlong l1 = long_at(index1);
+jlong l2 = cp2->long_at(index2);
+if (l1 == l2) {
+return true;
+}
+} break;
+case JVM_CONSTANT_NameAndType:
+{
+int recur1 = name_ref_index_at(index1);
+int recur2 = cp2->name_ref_index_at(index2);
+bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
+if (match) {
+recur1 = signature_ref_index_at(index1);
+recur2 = cp2->signature_ref_index_at(index2);
+match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
+if (match) {
+return true;
+}
+}
+} break;
+case JVM_CONSTANT_StringIndex:
+{
+int recur1 = string_index_at(index1);
+int recur2 = cp2->string_index_at(index2);
+bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
+if (match) {
+return true;
+}
+} break;
+case JVM_CONSTANT_UnresolvedClass:
+{
+Symbol* k1 = unresolved_klass_at(index1);
+Symbol* k2 = cp2->unresolved_klass_at(index2);
+if (k1 == k2) {
+return true;
+}
+} break;
+case JVM_CONSTANT_MethodType:
+{
+int k1 = method_type_index_at(index1);
+int k2 = cp2->method_type_index_at(index2);
+bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
+if (match) {
+return true;
+}
+} break;
+case JVM_CONSTANT_MethodHandle:
+{
+int k1 = method_handle_ref_kind_at(index1);
+int k2 = cp2->method_handle_ref_kind_at(index2);
+if (k1 == k2) {
+int i1 = method_handle_index_at(index1);
+int i2 = cp2->method_handle_index_at(index2);
+bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
+if (match) {
+return true;
+}
+}
+} break;
+case JVM_CONSTANT_InvokeDynamic:
+{
+int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
+int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
+bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
+if (!match)  return false;
+k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
+k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
+match = compare_entry_to(k1, cp2, k2, CHECK_false);
+if (!match)  return false;
+int argc = invoke_dynamic_argument_count_at(index1);
+if (argc == cp2->invoke_dynamic_argument_count_at(index2)) {
+for (int j = 0; j < argc; j++) {
+k1 = invoke_dynamic_argument_index_at(index1, j);
+k2 = cp2->invoke_dynamic_argument_index_at(index2, j);
+match = compare_entry_to(k1, cp2, k2, CHECK_false);
+if (!match)  return false;
+}
+return true;           // got through loop; all elements equal
+}
+} break;
+case JVM_CONSTANT_String:
+{
+Symbol* s1 = unresolved_string_at(index1);
+Symbol* s2 = cp2->unresolved_string_at(index2);
+if (s1 == s2) {
+return true;
+}
+} break;
+case JVM_CONSTANT_Utf8:
+{
+Symbol* s1 = symbol_at(index1);
+Symbol* s2 = cp2->symbol_at(index2);
+if (s1 == s2) {
+return true;
+}
+} break;
+// Invalid is used as the tag for the second constant pool entry
+// occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
+// not be seen by itself.
+case JVM_CONSTANT_Invalid: // fall through
+default:
+ShouldNotReachHere();
+break;
+}
+return false;
+} // end compare_entry_to()
+// Copy this constant pool's entries at start_i to end_i (inclusive)
+// to the constant pool to_cp's entries starting at to_i. A total of
+// (end_i - start_i) + 1 entries are copied.
+void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
+constantPoolHandle to_cp, int to_i, TRAPS) {
+int dest_i = to_i;  // leave original alone for debug purposes
+for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
+copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
+switch (from_cp->tag_at(src_i).value()) {
+case JVM_CONSTANT_Double:
+case JVM_CONSTANT_Long:
+// double and long take two constant pool entries
+src_i += 2;
+dest_i += 2;
+break;
+default:
+// all others take one constant pool entry
+src_i++;
+dest_i++;
+break;
+}
+}
+int from_oplen = operand_array_length(from_cp->operands());
+int old_oplen  = operand_array_length(to_cp->operands());
+if (from_oplen != 0) {
+// append my operands to the target's operands array
+if (old_oplen == 0) {
+to_cp->set_operands(from_cp->operands());  // reuse; do not merge
+} else {
+int old_len  = to_cp->operands()->length();
+int from_len = from_cp->operands()->length();
+int old_off  = old_oplen * sizeof(u2);
+int from_off = from_oplen * sizeof(u2);
+// Use the metaspace for the destination constant pool
+ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
+Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
+int fillp = 0, len = 0;
+// first part of dest
+Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
+new_operands->adr_at(fillp),
+(len = old_off) * sizeof(u2));
+fillp += len;
+// first part of src
+Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
+new_operands->adr_at(fillp),
+(len = from_off) * sizeof(u2));
+fillp += len;
+// second part of dest
+Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
+new_operands->adr_at(fillp),
+(len = old_len - old_off) * sizeof(u2));
+fillp += len;
+// second part of src
+Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(from_off),
+new_operands->adr_at(fillp),
+(len = from_len - from_off) * sizeof(u2));
+fillp += len;
+assert(fillp == new_operands->length(), "");
+// Adjust indexes in the first part of the copied operands array.
+for (int j = 0; j < from_oplen; j++) {
+int offset = operand_offset_at(new_operands, old_oplen + j);
+assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
+offset += old_len;  // every new tuple is preceded by old_len extra u2's
+operand_offset_at_put(new_operands, old_oplen + j, offset);
+}
+// replace target operands array with combined array
+to_cp->set_operands(new_operands);
+}
+}
+} // end copy_cp_to()
+// Copy this constant pool's entry at from_i to the constant pool
+// to_cp's entry at to_i.
+void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
+constantPoolHandle to_cp, int to_i,
+TRAPS) {
+int tag = from_cp->tag_at(from_i).value();
+switch (tag) {
+case JVM_CONSTANT_Class:
+{
+Klass* k = from_cp->klass_at(from_i, CHECK);
+to_cp->klass_at_put(to_i, k);
+} break;
+case JVM_CONSTANT_ClassIndex:
+{
+jint ki = from_cp->klass_index_at(from_i);
+to_cp->klass_index_at_put(to_i, ki);
+} break;
+case JVM_CONSTANT_Double:
+{
+jdouble d = from_cp->double_at(from_i);
+to_cp->double_at_put(to_i, d);
+// double takes two constant pool entries so init second entry's tag
+to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
+} break;
+case JVM_CONSTANT_Fieldref:
+{
+int class_index = from_cp->uncached_klass_ref_index_at(from_i);
+int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
+to_cp->field_at_put(to_i, class_index, name_and_type_index);
+} break;
+case JVM_CONSTANT_Float:
+{
+jfloat f = from_cp->float_at(from_i);
+to_cp->float_at_put(to_i, f);
+} break;
+case JVM_CONSTANT_Integer:
+{
+jint i = from_cp->int_at(from_i);
+to_cp->int_at_put(to_i, i);
+} break;
+case JVM_CONSTANT_InterfaceMethodref:
+{
+int class_index = from_cp->uncached_klass_ref_index_at(from_i);
+int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
+to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
+} break;
+case JVM_CONSTANT_Long:
+{
+jlong l = from_cp->long_at(from_i);
+to_cp->long_at_put(to_i, l);
+// long takes two constant pool entries so init second entry's tag
+to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
+} break;
+case JVM_CONSTANT_Methodref:
+{
+int class_index = from_cp->uncached_klass_ref_index_at(from_i);
+int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
+to_cp->method_at_put(to_i, class_index, name_and_type_index);
+} break;
+case JVM_CONSTANT_NameAndType:
+{
+int name_ref_index = from_cp->name_ref_index_at(from_i);
+int signature_ref_index = from_cp->signature_ref_index_at(from_i);
+to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
+} break;
+case JVM_CONSTANT_StringIndex:
+{
+jint si = from_cp->string_index_at(from_i);
+to_cp->string_index_at_put(to_i, si);
+} break;
+case JVM_CONSTANT_UnresolvedClass:
+{
+// Can be resolved after checking tag, so check the slot first.
+CPSlot entry = from_cp->slot_at(from_i);
+if (entry.is_resolved()) {
+assert(entry.get_klass()->is_klass(), "must be");
+// Already resolved
+to_cp->klass_at_put(to_i, entry.get_klass());
+} else {
+to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
+}
+} break;
+case JVM_CONSTANT_UnresolvedClassInError:
+{
+Symbol* k = from_cp->unresolved_klass_at(from_i);
+to_cp->unresolved_klass_at_put(to_i, k);
+to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
+} break;
+case JVM_CONSTANT_String:
+{
+Symbol* s = from_cp->unresolved_string_at(from_i);
+to_cp->unresolved_string_at_put(to_i, s);
+} break;
+case JVM_CONSTANT_Utf8:
+{
+Symbol* s = from_cp->symbol_at(from_i);
+// Need to increase refcount, the old one will be thrown away and deferenced
+s->increment_refcount();
+to_cp->symbol_at_put(to_i, s);
+} break;
+case JVM_CONSTANT_MethodType:
+{
+jint k = from_cp->method_type_index_at(from_i);
+to_cp->method_type_index_at_put(to_i, k);
+} break;
+case JVM_CONSTANT_MethodHandle:
+{
+int k1 = from_cp->method_handle_ref_kind_at(from_i);
+int k2 = from_cp->method_handle_index_at(from_i);
+to_cp->method_handle_index_at_put(to_i, k1, k2);
+} break;
+case JVM_CONSTANT_InvokeDynamic:
+{
+int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
+int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
+k1 += operand_array_length(to_cp->operands());  // to_cp might already have operands
+to_cp->invoke_dynamic_at_put(to_i, k1, k2);
+} break;
+// Invalid is used as the tag for the second constant pool entry
+// occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
+// not be seen by itself.
+case JVM_CONSTANT_Invalid: // fall through
+default:
+{
+ShouldNotReachHere();
+} break;
+}
+} // end copy_entry_to()
+// Search constant pool search_cp for an entry that matches this
+// constant pool's entry at pattern_i. Returns the index of a
+// matching entry or zero (0) if there is no matching entry.
+int ConstantPool::find_matching_entry(int pattern_i,
+constantPoolHandle search_cp, TRAPS) {
+// index zero (0) is not used
+for (int i = 1; i < search_cp->length(); i++) {
+bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
+if (found) {
+return i;
+}
+}
+return 0;  // entry not found; return unused index zero (0)
+} // end find_matching_entry()
+#ifndef PRODUCT
+const char* ConstantPool::printable_name_at(int which) {
+constantTag tag = tag_at(which);
+if (tag.is_string()) {
+return string_at_noresolve(which);
+} else if (tag.is_klass() || tag.is_unresolved_klass()) {
+return klass_name_at(which)->as_C_string();
+} else if (tag.is_symbol()) {
+return symbol_at(which)->as_C_string();
+}
+return "";
+}
+#endif // PRODUCT
+// JVMTI GetConstantPool support
+// For temporary use until code is stable.
+#define DBG(code)
+static const char* WARN_MSG = "Must not be such entry!";
+static void print_cpool_bytes(jint cnt, u1 *bytes) {
+jint size = 0;
+u2   idx1, idx2;
+for (jint idx = 1; idx < cnt; idx++) {
+jint ent_size = 0;
+u1   tag  = *bytes++;
+size++;                       // count tag
+printf("const #%03d, tag: %02d ", idx, tag);
+switch(tag) {
+case JVM_CONSTANT_Invalid: {
+printf("Invalid");
+break;
+}
+case JVM_CONSTANT_Unicode: {
+printf("Unicode      %s", WARN_MSG);
+break;
+}
+case JVM_CONSTANT_Utf8: {
+u2 len = Bytes::get_Java_u2(bytes);
+char str[128];
+if (len > 127) {
+len = 127;
+}
+strncpy(str, (char *) (bytes+2), len);
+str[len] = '\0';
+printf("Utf8          \"%s\"", str);
+ent_size = 2 + len;
+break;
+}
+case JVM_CONSTANT_Integer: {
+u4 val = Bytes::get_Java_u4(bytes);
+printf("int          %d", *(int *) &val);
+ent_size = 4;
+break;
+}
+case JVM_CONSTANT_Float: {
+u4 val = Bytes::get_Java_u4(bytes);
+printf("float        %5.3ff", *(float *) &val);
+ent_size = 4;
+break;
+}
+case JVM_CONSTANT_Long: {
+u8 val = Bytes::get_Java_u8(bytes);
+printf("long         "INT64_FORMAT, (int64_t) *(jlong *) &val);
+ent_size = 8;
+idx++; // Long takes two cpool slots
+break;
+}
+case JVM_CONSTANT_Double: {
+u8 val = Bytes::get_Java_u8(bytes);
+printf("double       %5.3fd", *(jdouble *)&val);
+ent_size = 8;
+idx++; // Double takes two cpool slots
+break;
+}
+case JVM_CONSTANT_Class: {
+idx1 = Bytes::get_Java_u2(bytes);
+printf("class        #%03d", idx1);
+ent_size = 2;
+break;
+}
+case JVM_CONSTANT_String: {
+idx1 = Bytes::get_Java_u2(bytes);
+printf("String       #%03d", idx1);
+ent_size = 2;
+break;
+}
+case JVM_CONSTANT_Fieldref: {
+idx1 = Bytes::get_Java_u2(bytes);
+idx2 = Bytes::get_Java_u2(bytes+2);
+printf("Field        #%03d, #%03d", (int) idx1, (int) idx2);
+ent_size = 4;
+break;
+}
+case JVM_CONSTANT_Methodref: {
+idx1 = Bytes::get_Java_u2(bytes);
+idx2 = Bytes::get_Java_u2(bytes+2);
+printf("Method       #%03d, #%03d", idx1, idx2);
+ent_size = 4;
+break;
+}
+case JVM_CONSTANT_InterfaceMethodref: {
+idx1 = Bytes::get_Java_u2(bytes);
+idx2 = Bytes::get_Java_u2(bytes+2);
+printf("InterfMethod #%03d, #%03d", idx1, idx2);
+ent_size = 4;
+break;
+}
+case JVM_CONSTANT_NameAndType: {
+idx1 = Bytes::get_Java_u2(bytes);
+idx2 = Bytes::get_Java_u2(bytes+2);
+printf("NameAndType  #%03d, #%03d", idx1, idx2);
+ent_size = 4;
+break;
+}
+case JVM_CONSTANT_ClassIndex: {
+printf("ClassIndex  %s", WARN_MSG);
+break;
+}
+case JVM_CONSTANT_UnresolvedClass: {
+printf("UnresolvedClass: %s", WARN_MSG);
+break;
+}
+case JVM_CONSTANT_UnresolvedClassInError: {
+printf("UnresolvedClassInErr: %s", WARN_MSG);
+break;
+}
+case JVM_CONSTANT_StringIndex: {
+printf("StringIndex: %s", WARN_MSG);
+break;
+}
+}
+printf(";\n");
+bytes += ent_size;
+size  += ent_size;
+}
+printf("Cpool size: %d\n", size);
+fflush(0);
+return;
+} /* end print_cpool_bytes */
+// Returns size of constant pool entry.
+jint ConstantPool::cpool_entry_size(jint idx) {
+switch(tag_at(idx).value()) {
+case JVM_CONSTANT_Invalid:
+case JVM_CONSTANT_Unicode:
+return 1;
+case JVM_CONSTANT_Utf8:
+return 3 + symbol_at(idx)->utf8_length();
+case JVM_CONSTANT_Class:
+case JVM_CONSTANT_String:
+case JVM_CONSTANT_ClassIndex:
+case JVM_CONSTANT_UnresolvedClass:
+case JVM_CONSTANT_UnresolvedClassInError:
+case JVM_CONSTANT_StringIndex:
+case JVM_CONSTANT_MethodType:
+return 3;
+case JVM_CONSTANT_MethodHandle:
+return 4; //tag, ref_kind, ref_index
+case JVM_CONSTANT_Integer:
+case JVM_CONSTANT_Float:
+case JVM_CONSTANT_Fieldref:
+case JVM_CONSTANT_Methodref:
+case JVM_CONSTANT_InterfaceMethodref:
+case JVM_CONSTANT_NameAndType:
+return 5;
+case JVM_CONSTANT_InvokeDynamic:
+// u1 tag, u2 bsm, u2 nt
+return 5;
+case JVM_CONSTANT_Long:
+case JVM_CONSTANT_Double:
+return 9;
+}
+assert(false, "cpool_entry_size: Invalid constant pool entry tag");
+return 1;
+} /* end cpool_entry_size */
+// SymbolHashMap is used to find a constant pool index from a string.
+// This function fills in SymbolHashMaps, one for utf8s and one for
+// class names, returns size of the cpool raw bytes.
+jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
+SymbolHashMap *classmap) {
+jint size = 0;
+for (u2 idx = 1; idx < length(); idx++) {
+u2 tag = tag_at(idx).value();
+size += cpool_entry_size(idx);
+switch(tag) {
+case JVM_CONSTANT_Utf8: {
+Symbol* sym = symbol_at(idx);
+symmap->add_entry(sym, idx);
+DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
+break;
+}
+case JVM_CONSTANT_Class:
+case JVM_CONSTANT_UnresolvedClass:
+case JVM_CONSTANT_UnresolvedClassInError: {
+Symbol* sym = klass_name_at(idx);
+classmap->add_entry(sym, idx);
+DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
+break;
+}
+case JVM_CONSTANT_Long:
+case JVM_CONSTANT_Double: {
+idx++; // Both Long and Double take two cpool slots
+break;
+}
+}
+}
+return size;
+} /* end hash_utf8_entries_to */
+// Copy cpool bytes.
+// Returns:
+//    0, in case of OutOfMemoryError
+//   -1, in case of internal error
+//  > 0, count of the raw cpool bytes that have been copied
+int ConstantPool::copy_cpool_bytes(int cpool_size,
+SymbolHashMap* tbl,
+unsigned char *bytes) {
+u2   idx1, idx2;
+jint size  = 0;
+jint cnt   = length();
+unsigned char *start_bytes = bytes;
+for (jint idx = 1; idx < cnt; idx++) {
+u1   tag      = tag_at(idx).value();
+jint ent_size = cpool_entry_size(idx);
+assert(size + ent_size <= cpool_size, "Size mismatch");
+*bytes = tag;
+DBG(printf("#%03hd tag=%03hd, ", idx, tag));
+switch(tag) {
+case JVM_CONSTANT_Invalid: {
+DBG(printf("JVM_CONSTANT_Invalid"));
+break;
+}
+case JVM_CONSTANT_Unicode: {
+assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
+DBG(printf("JVM_CONSTANT_Unicode"));
+break;
+}
+case JVM_CONSTANT_Utf8: {
+Symbol* sym = symbol_at(idx);
+char*     str = sym->as_utf8();
+// Warning! It's crashing on x86 with len = sym->utf8_length()
+int       len = (int) strlen(str);
+Bytes::put_Java_u2((address) (bytes+1), (u2) len);
+for (int i = 0; i < len; i++) {
+bytes[3+i] = (u1) str[i];
+}
+DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
+break;
+}
+case JVM_CONSTANT_Integer: {
+jint val = int_at(idx);
+Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
+break;
+}
+case JVM_CONSTANT_Float: {
+jfloat val = float_at(idx);
+Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
+break;
+}
+case JVM_CONSTANT_Long: {
+jlong val = long_at(idx);
+Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
+idx++;             // Long takes two cpool slots
+break;
+}
+case JVM_CONSTANT_Double: {
+jdouble val = double_at(idx);
+Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
+idx++;             // Double takes two cpool slots
+break;
+}
+case JVM_CONSTANT_Class:
+case JVM_CONSTANT_UnresolvedClass:
+case JVM_CONSTANT_UnresolvedClassInError: {
+*bytes = JVM_CONSTANT_Class;
+Symbol* sym = klass_name_at(idx);
+idx1 = tbl->symbol_to_value(sym);
+assert(idx1 != 0, "Have not found a hashtable entry");
+Bytes::put_Java_u2((address) (bytes+1), idx1);
+DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
+break;
+}
+case JVM_CONSTANT_String: {
+*bytes = JVM_CONSTANT_String;
+Symbol* sym = unresolved_string_at(idx);
+idx1 = tbl->symbol_to_value(sym);
+assert(idx1 != 0, "Have not found a hashtable entry");
+Bytes::put_Java_u2((address) (bytes+1), idx1);
+DBG(char *str = sym->as_utf8());
+DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
+break;
+}
+case JVM_CONSTANT_Fieldref:
+case JVM_CONSTANT_Methodref:
+case JVM_CONSTANT_InterfaceMethodref: {
+idx1 = uncached_klass_ref_index_at(idx);
+idx2 = uncached_name_and_type_ref_index_at(idx);
+Bytes::put_Java_u2((address) (bytes+1), idx1);
+Bytes::put_Java_u2((address) (bytes+3), idx2);
+DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
+break;
+}
+case JVM_CONSTANT_NameAndType: {
+idx1 = name_ref_index_at(idx);
+idx2 = signature_ref_index_at(idx);
+Bytes::put_Java_u2((address) (bytes+1), idx1);
+Bytes::put_Java_u2((address) (bytes+3), idx2);
+DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
+break;
+}
+case JVM_CONSTANT_ClassIndex: {
+*bytes = JVM_CONSTANT_Class;
+idx1 = klass_index_at(idx);
+Bytes::put_Java_u2((address) (bytes+1), idx1);
+DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
+break;
+}
+case JVM_CONSTANT_StringIndex: {
+*bytes = JVM_CONSTANT_String;
+idx1 = string_index_at(idx);
+Bytes::put_Java_u2((address) (bytes+1), idx1);
+DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
+break;
+}
+case JVM_CONSTANT_MethodHandle:
+case JVM_CONSTANT_MethodHandleInError: {
+*bytes = JVM_CONSTANT_MethodHandle;
+int kind = method_handle_ref_kind_at(idx);
+idx1 = method_handle_index_at(idx);
+*(bytes+1) = (unsigned char) kind;
+Bytes::put_Java_u2((address) (bytes+2), idx1);
+DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
+break;
+}
+case JVM_CONSTANT_MethodType:
+case JVM_CONSTANT_MethodTypeInError: {
+*bytes = JVM_CONSTANT_MethodType;
+idx1 = method_type_index_at(idx);
+Bytes::put_Java_u2((address) (bytes+1), idx1);
+DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
+break;
+}
+case JVM_CONSTANT_InvokeDynamic: {
+*bytes = tag;
+idx1 = extract_low_short_from_int(*int_at_addr(idx));
+idx2 = extract_high_short_from_int(*int_at_addr(idx));
+assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
+Bytes::put_Java_u2((address) (bytes+1), idx1);
+Bytes::put_Java_u2((address) (bytes+3), idx2);
+DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
+break;
+}
+}
+DBG(printf("\n"));
+bytes += ent_size;
+size  += ent_size;
+}
+assert(size == cpool_size, "Size mismatch");
+// Keep temorarily for debugging until it's stable.
+DBG(print_cpool_bytes(cnt, start_bytes));
+return (int)(bytes - start_bytes);
+} /* end copy_cpool_bytes */
+void ConstantPool::set_on_stack(const bool value) {
+_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,
+InstanceKlass::cast(pool_holder())->external_name()));
+}
+#endif // ASSERT
+}
+#ifndef PRODUCT
+// CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
+void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
+guarantee(obj->is_constantPool(), "object must be constant pool");
+constantPoolHandle cp(THREAD, (ConstantPool*)obj);
+guarantee(cp->pool_holder() != NULL, "must be fully loaded");
+for (int i = 0; i< cp->length();  i++) {
+if (cp->tag_at(i).is_unresolved_klass()) {
+// This will force loading of the class
+Klass* klass = cp->klass_at(i, CHECK);
+if (klass->oop_is_instance()) {
+// Force initialization of class
+InstanceKlass::cast(klass)->initialize(CHECK);
+}
+}
+}
+}
+#endif
+// Printing
+void ConstantPool::print_on(outputStream* st) const {
+EXCEPTION_MARK;
+assert(is_constantPool(), "must be constantPool");
+st->print_cr(internal_name());
+if (flags() != 0) {
+st->print(" - flags: 0x%x", flags());
+if (has_pseudo_string()) st->print(" has_pseudo_string");
+if (has_invokedynamic()) st->print(" has_invokedynamic");
+if (has_preresolution()) st->print(" has_preresolution");
+st->cr();
+}
+if (pool_holder() != NULL) {
+st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
+}
+st->print_cr(" - cache: " INTPTR_FORMAT, cache());
+st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references());
+st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
+for (int index = 1; index < length(); index++) {      // Index 0 is unused
+((ConstantPool*)this)->print_entry_on(index, st);
+switch (tag_at(index).value()) {
+case JVM_CONSTANT_Long :
+case JVM_CONSTANT_Double :
+index++;   // Skip entry following eigth-byte constant
+}
+}
+st->cr();
+}
+// Print one constant pool entry
+void ConstantPool::print_entry_on(const int index, outputStream* st) {
+EXCEPTION_MARK;
+st->print(" - %3d : ", index);
+tag_at(index).print_on(st);
+st->print(" : ");
+switch (tag_at(index).value()) {
+case JVM_CONSTANT_Class :
+{ Klass* k = klass_at(index, CATCH);
+k->print_value_on(st);
+st->print(" {0x%lx}", (address)k);
+}
+break;
+case JVM_CONSTANT_Fieldref :
+case JVM_CONSTANT_Methodref :
+case JVM_CONSTANT_InterfaceMethodref :
+st->print("klass_index=%d", uncached_klass_ref_index_at(index));
+st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
+break;
+case JVM_CONSTANT_String :
+unresolved_string_at(index)->print_value_on(st);
+break;
+case JVM_CONSTANT_Object : {
+oop anObj = object_at(index);
+anObj->print_value_on(st);
+st->print(" {0x%lx}", (address)anObj);
+} break;
+case JVM_CONSTANT_Integer :
+st->print("%d", int_at(index));
+break;
+case JVM_CONSTANT_Float :
+st->print("%f", float_at(index));
+break;
+case JVM_CONSTANT_Long :
+st->print_jlong(long_at(index));
+break;
+case JVM_CONSTANT_Double :
+st->print("%lf", double_at(index));
+break;
+case JVM_CONSTANT_NameAndType :
+st->print("name_index=%d", name_ref_index_at(index));
+st->print(" signature_index=%d", signature_ref_index_at(index));
+break;
+case JVM_CONSTANT_Utf8 :
+symbol_at(index)->print_value_on(st);
+break;
+case JVM_CONSTANT_UnresolvedClass :               // fall-through
+case JVM_CONSTANT_UnresolvedClassInError: {
+// unresolved_klass_at requires lock or safe world.
+CPSlot entry = slot_at(index);
+if (entry.is_resolved()) {
+entry.get_klass()->print_value_on(st);
+} else {
+entry.get_symbol()->print_value_on(st);
+}
+}
+break;
+case JVM_CONSTANT_MethodHandle :
+case JVM_CONSTANT_MethodHandleInError :
+st->print("ref_kind=%d", method_handle_ref_kind_at(index));
+st->print(" ref_index=%d", method_handle_index_at(index));
+break;
+case JVM_CONSTANT_MethodType :
+case JVM_CONSTANT_MethodTypeInError :
+st->print("signature_index=%d", method_type_index_at(index));
+break;
+case JVM_CONSTANT_InvokeDynamic :
+{
+st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
+st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
+int argc = invoke_dynamic_argument_count_at(index);
+if (argc > 0) {
+for (int arg_i = 0; arg_i < argc; arg_i++) {
+int arg = invoke_dynamic_argument_index_at(index, arg_i);
+st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
+}
+st->print("}");
+}
+}
+break;
+default:
+ShouldNotReachHere();
+break;
+}
+st->cr();
+}
+void ConstantPool::print_value_on(outputStream* st) const {
+assert(is_constantPool(), "must be constantPool");
+st->print("constant pool [%d]", length());
+if (has_pseudo_string()) st->print("/pseudo_string");
+if (has_invokedynamic()) st->print("/invokedynamic");
+if (has_preresolution()) st->print("/preresolution");
+if (operands() != NULL)  st->print("/operands[%d]", operands()->length());
+print_address_on(st);
+st->print(" for ");
+pool_holder()->print_value_on(st);
+if (pool_holder() != NULL) {
+bool extra = (InstanceKlass::cast(pool_holder())->constants() != this);
+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");
+}
+}
+void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
+char *str = sym->as_utf8();
+unsigned int hash = compute_hash(str, sym->utf8_length());
+unsigned int index = hash % table_size();
+// check if already in map
+// we prefer the first entry since it is more likely to be what was used in
+// the class file
+for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
+assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
+if (en->hash() == hash && en->symbol() == sym) {
+return;  // already there
+}
+}
+SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
+entry->set_next(bucket(index));
+_buckets[index].set_entry(entry);
+assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
+}
+SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
+assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
+char *str = sym->as_utf8();
+int   len = sym->utf8_length();
+unsigned int hash = SymbolHashMap::compute_hash(str, len);
+unsigned int index = hash % table_size();
+for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
+assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
+if (en->hash() == hash && en->symbol() == sym) {
+return en;
+}
+}
+return NULL;
+}

Mercurial > hg > truffle

comparison src/share/vm/oops/constantPool.cpp @ 6725:da91efe96a93