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 /*

  * Copyright (c) 2017, 2018, 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 "jfr/recorder/checkpoint/types/jfrTypeSetUtils.hpp"

 #include "oops/instanceKlass.hpp"

 #include "oops/oop.inline.hpp"

 #include "oops/symbol.hpp"

 JfrSymbolId::JfrSymbolId() : _symbol_id_counter(0), _sym_table(new SymbolTable(this)), _cstring_table(new CStringTable(this)) {

   assert(_sym_table != NULL, "invariant");

   assert(_cstring_table != NULL, "invariant");

   initialize();

 }

 void JfrSymbolId::initialize() {

   clear();

   assert(_symbol_id_counter == 0, "invariant");

 }

 void JfrSymbolId::clear() {

   assert(_sym_table != NULL, "invariant");

   if (_sym_table->has_entries()) {

     _sym_table->clear_entries();

   }

   assert(!_sym_table->has_entries(), "invariant");

   assert(_cstring_table != NULL, "invariant");

   if (_cstring_table->has_entries()) {

     _cstring_table->clear_entries();

   }

   assert(!_cstring_table->has_entries(), "invariant");

   _symbol_id_counter = 0;

 }

 JfrSymbolId::~JfrSymbolId() {

   delete _sym_table;

   delete _cstring_table;

 }

 traceid JfrSymbolId::mark_anonymous_klass_name(const Klass* k) {

   assert(k != NULL, "invariant");

   assert(k->oop_is_instance(), "invariant");

   assert(is_anonymous_klass(k), "invariant");

   uintptr_t anonymous_symbol_hash_code = 0;

   const char* const anonymous_symbol =

     create_anonymous_klass_symbol((const InstanceKlass*)k, anonymous_symbol_hash_code);

   if (anonymous_symbol == NULL) {

     return 0;

   }

   assert(anonymous_symbol_hash_code != 0, "invariant");

   traceid symbol_id = mark(anonymous_symbol, anonymous_symbol_hash_code);

   assert(mark(anonymous_symbol, anonymous_symbol_hash_code) == symbol_id, "invariant");

   return symbol_id;

 }

 const JfrSymbolId::SymbolEntry* JfrSymbolId::map_symbol(const Symbol* symbol) const {

   return _sym_table->lookup_only(symbol, (uintptr_t)const_cast<Symbol*>(symbol)->identity_hash());

 }

 const JfrSymbolId::SymbolEntry* JfrSymbolId::map_symbol(uintptr_t hash) const {

   return _sym_table->lookup_only(NULL, hash);

 }

 const JfrSymbolId::CStringEntry* JfrSymbolId::map_cstring(uintptr_t hash) const {

   return _cstring_table->lookup_only(NULL, hash);

 }

 void JfrSymbolId::assign_id(SymbolEntry* entry) {

   assert(entry != NULL, "invariant");

   assert(entry->id() == 0, "invariant");

   entry->set_id(++_symbol_id_counter);

 }

 bool JfrSymbolId::equals(const Symbol* query, uintptr_t hash, const SymbolEntry* entry) {

   // query might be NULL

   assert(entry != NULL, "invariant");

   assert(entry->hash() == hash, "invariant");

   return true;

 }

 void JfrSymbolId::assign_id(CStringEntry* entry) {

   assert(entry != NULL, "invariant");

   assert(entry->id() == 0, "invariant");

   entry->set_id(++_symbol_id_counter);

 }

 bool JfrSymbolId::equals(const char* query, uintptr_t hash, const CStringEntry* entry) {

   // query might be NULL

   assert(entry != NULL, "invariant");

   assert(entry->hash() == hash, "invariant");

   return true;

 }

 traceid JfrSymbolId::mark(const Klass* k) {

   assert(k != NULL, "invariant");

   traceid symbol_id = 0;

   if (is_anonymous_klass(k)) {

     symbol_id = mark_anonymous_klass_name(k);

   }

   if (0 == symbol_id) {

     const Symbol* const sym = k->name();

     if (sym != NULL) {

       symbol_id = mark(sym);

     }

   }

   assert(symbol_id > 0, "a symbol handler must mark the symbol for writing");

   return symbol_id;

 }

 traceid JfrSymbolId::mark(const Symbol* symbol) {

   assert(symbol != NULL, "invariant");

   return mark(symbol, (uintptr_t)const_cast<Symbol*>(symbol)->identity_hash());

 }

 traceid JfrSymbolId::mark(const Symbol* data, uintptr_t hash) {

   assert(data != NULL, "invariant");

   assert(_sym_table != NULL, "invariant");

   return _sym_table->id(data, hash);

 }

 traceid JfrSymbolId::mark(const char* str, uintptr_t hash) {

   assert(str != NULL, "invariant");

   return _cstring_table->id(str, hash);

 }

 bool JfrSymbolId::is_anonymous_klass(const Klass* k) {

   assert(k != NULL, "invariant");

   return k->oop_is_instance() && ((const InstanceKlass*)k)->is_anonymous();

 }

 /*

 * jsr292 anonymous classes symbol is the external name +

 * the identity_hashcode slash appended:

 *   java.lang.invoke.LambdaForm$BMH/22626602

 *

 * caller needs ResourceMark

 */

 uintptr_t JfrSymbolId::anonymous_klass_name_hash_code(const InstanceKlass* ik) {

   assert(ik != NULL, "invariant");

   assert(ik->is_anonymous(), "invariant");

   const oop mirror = ik->java_mirror();

   assert(mirror != NULL, "invariant");

   return (uintptr_t)mirror->identity_hash();

 }

 const char* JfrSymbolId::create_anonymous_klass_symbol(const InstanceKlass* ik, uintptr_t& hashcode) {

   assert(ik != NULL, "invariant");

   assert(ik->is_anonymous(), "invariant");

   assert(0 == hashcode, "invariant");

   char* anonymous_symbol = NULL;

   const oop mirror = ik->java_mirror();

   assert(mirror != NULL, "invariant");

   char hash_buf[40];

   hashcode = anonymous_klass_name_hash_code(ik);

   sprintf(hash_buf, "/" UINTX_FORMAT, hashcode);

   const size_t hash_len = strlen(hash_buf);

   const size_t result_len = ik->name()->utf8_length();

   anonymous_symbol = NEW_RESOURCE_ARRAY(char, result_len + hash_len + 1);

   ik->name()->as_klass_external_name(anonymous_symbol, (int)result_len + 1);

   assert(strlen(anonymous_symbol) == result_len, "invariant");

   strcpy(anonymous_symbol + result_len, hash_buf);

   assert(strlen(anonymous_symbol) == result_len + hash_len, "invariant");

   return anonymous_symbol;

 }

 uintptr_t JfrSymbolId::regular_klass_name_hash_code(const Klass* k) {

   assert(k != NULL, "invariant");

   const Symbol* const sym = k->name();

   assert(sym != NULL, "invariant");

   return (uintptr_t)const_cast<Symbol*>(sym)->identity_hash();

 }

 JfrArtifactSet::JfrArtifactSet(bool class_unload) : _symbol_id(new JfrSymbolId()),

                                                     _klass_list(NULL),

                                                     _class_unload(class_unload) {

   initialize(class_unload);

   assert(_klass_list != NULL, "invariant");

 }

 static const size_t initial_class_list_size = 200;

 void JfrArtifactSet::initialize(bool class_unload) {

   assert(_symbol_id != NULL, "invariant");

   _symbol_id->initialize();

   assert(!_symbol_id->has_entries(), "invariant");

   _symbol_id->mark(BOOTSTRAP_LOADER_NAME, 0); // pre-load "bootstrap"

   _class_unload = class_unload;

   // resource allocation

   _klass_list = new GrowableArray<const Klass*>(initial_class_list_size, false, mtTracing);

 }

 JfrArtifactSet::~JfrArtifactSet() {

   clear();

 }

 void JfrArtifactSet::clear() {

   _symbol_id->clear();

   // _klass_list will be cleared by a ResourceMark

 }

 traceid JfrArtifactSet::mark_anonymous_klass_name(const Klass* klass) {

   return _symbol_id->mark_anonymous_klass_name(klass);

 }

 traceid JfrArtifactSet::mark(const Symbol* sym, uintptr_t hash) {

   return _symbol_id->mark(sym, hash);

 }

 traceid JfrArtifactSet::mark(const Klass* klass) {

   return _symbol_id->mark(klass);

 }

 traceid JfrArtifactSet::mark(const Symbol* symbol) {

   return _symbol_id->mark(symbol);

 }

 traceid JfrArtifactSet::mark(const char* const str, uintptr_t hash) {

   return _symbol_id->mark(str, hash);

 }

 const JfrSymbolId::SymbolEntry* JfrArtifactSet::map_symbol(const Symbol* symbol) const {

   return _symbol_id->map_symbol(symbol);

 }

 const JfrSymbolId::SymbolEntry* JfrArtifactSet::map_symbol(uintptr_t hash) const {

   return _symbol_id->map_symbol(hash);

 }

 const JfrSymbolId::CStringEntry* JfrArtifactSet::map_cstring(uintptr_t hash) const {

   return _symbol_id->map_cstring(hash);

 }

 bool JfrArtifactSet::has_klass_entries() const {

   return _klass_list->is_nonempty();

 }

 int JfrArtifactSet::entries() const {

   return _klass_list->length();

 }

 void JfrArtifactSet::register_klass(const Klass* k) {

   assert(k != NULL, "invariant");

   assert(_klass_list != NULL, "invariant");

   assert(_klass_list->find(k) == -1, "invariant");

   _klass_list->append(k);

 }