< prev index next > src/hotspot/share/cds/classListWriter.cpp
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/*
! * Copyright (c) 2021, 2023, 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.
/*
! * Copyright (c) 2021, 2024, 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.
*
*/
#include "precompiled.hpp"
#include "cds/cds_globals.hpp"
+ #include "cds/classListParser.hpp"
#include "cds/classListWriter.hpp"
+ #include "cds/classPrelinker.hpp"
+ #include "cds/lambdaFormInvokers.inline.hpp"
#include "classfile/classFileStream.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/classLoaderData.hpp"
+ #include "classfile/classLoaderDataGraph.hpp"
#include "classfile/moduleEntry.hpp"
+ #include "classfile/symbolTable.hpp"
#include "classfile/systemDictionaryShared.hpp"
#include "memory/resourceArea.hpp"
+ #include "oops/constantPool.inline.hpp"
#include "oops/instanceKlass.hpp"
+ #include "runtime/javaCalls.hpp"
#include "runtime/mutexLocker.hpp"
fileStream* ClassListWriter::_classlist_file = nullptr;
void ClassListWriter::init() {
if (!SystemDictionaryShared::add_unregistered_class(Thread::current(), (InstanceKlass*)k)) {
return;
}
}
! // filter out java/lang/invoke/BoundMethodHandle$Species...
! if (cfs != nullptr && cfs->source() != nullptr && strcmp(cfs->source(), "_ClassSpecializer_generateConcreteSpeciesCode") == 0) {
! return;
}
{
InstanceKlass* super = k->java_super();
if (super != nullptr && !has_id(super)) {
if (!SystemDictionaryShared::add_unregistered_class(Thread::current(), (InstanceKlass*)k)) {
return;
}
}
! if (cfs != nullptr && cfs->source() != nullptr) {
! if (strcmp(cfs->source(), "_ClassSpecializer_generateConcreteSpeciesCode") == 0) {
! return;
+ }
+
+ if (strncmp(cfs->source(), "__", 2) == 0) {
+ // generated class: __dynamic_proxy__, __JVM_LookupDefineClass__, etc
+ return;
+ }
}
{
InstanceKlass* super = k->java_super();
if (super != nullptr && !has_id(super)) {
void ClassListWriter::delete_classlist() {
if (_classlist_file != nullptr) {
delete _classlist_file;
}
}
+
+ class ClassListWriter::WriteResolveConstantsCLDClosure : public CLDClosure {
+ public:
+ void do_cld(ClassLoaderData* cld) {
+ for (Klass* klass = cld->klasses(); klass != nullptr; klass = klass->next_link()) {
+ if (klass->is_instance_klass()) {
+ InstanceKlass* ik = InstanceKlass::cast(klass);
+ write_resolved_constants_for(ik);
+ write_array_info_for(ik); // FIXME: piggybacking on WriteResolveConstantsCLDClosure is misleading
+ }
+ }
+ }
+ };
+
+ void ClassListWriter::write_array_info_for(InstanceKlass* ik) {
+ ObjArrayKlass* oak = ik->array_klasses();
+ if (oak != nullptr) {
+ while (oak->higher_dimension() != nullptr) {
+ oak = oak->higher_dimension();
+ }
+ ResourceMark rm;
+ outputStream* stream = _classlist_file;
+ stream->print_cr("%s %s %d", ClassListParser::ARRAY_TAG, ik->name()->as_C_string(), oak->dimension());
+ }
+ }
+
+ void ClassListWriter::write_resolved_constants() {
+ if (!is_enabled()) {
+ return;
+ }
+ MutexLocker lock(ClassLoaderDataGraph_lock);
+ MutexLocker lock2(ClassListFile_lock, Mutex::_no_safepoint_check_flag);
+
+ WriteResolveConstantsCLDClosure closure;
+ ClassLoaderDataGraph::loaded_cld_do(&closure);
+ }
+
+ void ClassListWriter::write_reflection_data() {
+ if (!is_enabled()) {
+ return;
+ }
+ auto collector = [&] (const InstanceKlass* ik, int id) {
+ write_reflection_data_for(const_cast<InstanceKlass*>(ik));
+ };
+ _id_table->iterate_all(collector);
+ }
+
+ void ClassListWriter::write_reflection_data_for(InstanceKlass* ik) {
+ ResourceMark rm;
+ outputStream* stream = _classlist_file;
+ if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data()) || ik->is_hidden()) {
+ return; // ignore
+ }
+ if (java_lang_Class::has_reflection_data(ik->java_mirror())) {
+ EXCEPTION_MARK;
+ int rd_flags = ClassPrelinker::class_reflection_data_flags(ik, THREAD);
+ if (!HAS_PENDING_EXCEPTION) {
+ // We can't hold the lock when doing the upcall inside class_reflection_data_flags()
+ MutexLocker lock2(ClassListFile_lock, Mutex::_no_safepoint_check_flag);
+ stream->print_cr("%s %s %d", ClassListParser::CLASS_REFLECTION_DATA_TAG, ik->name()->as_C_string(), rd_flags);
+ }
+ }
+ }
+
+ void ClassListWriter::write_resolved_constants_for(InstanceKlass* ik) {
+ if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data()) ||
+ ik->is_hidden()) {
+ return;
+ }
+ if (LambdaFormInvokers::may_be_regenerated_class(ik->name())) {
+ return;
+ }
+ if (ik->name()->equals("jdk/internal/module/SystemModules$all")) {
+ // This class is regenerated during JDK build process, so the classlist
+ // may not match the version that's in the real jdk image.
+ return;
+ }
+
+ if (!has_id(ik)) { // do not resolve CP for classes loaded by custom loaders.
+ return;
+ }
+
+ ResourceMark rm;
+ ConstantPool* cp = ik->constants();
+ GrowableArray<bool> list(cp->length(), cp->length(), false);
+ bool print = false;
+
+ for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
+ switch (cp->tag_at(cp_index).value()) {
+ case JVM_CONSTANT_Class:
+ {
+ Klass* k = cp->resolved_klass_at(cp_index);
+ if (k->is_instance_klass()) {
+ list.at_put(cp_index, true);
+ print = true;
+ }
+ }
+ break;
+ }
+ }
+
+ if (cp->cache() != nullptr) {
+ Array<ResolvedIndyEntry>* indy_entries = cp->cache()->resolved_indy_entries();
+ if (indy_entries != nullptr) {
+ for (int i = 0; i < indy_entries->length(); i++) {
+ ResolvedIndyEntry* rie = indy_entries->adr_at(i);
+ int cp_index = rie->constant_pool_index();
+ if (rie->is_resolved()) {
+ list.at_put(cp_index, true);
+ print = true;
+ }
+ }
+ }
+
+ Array<ResolvedFieldEntry>* field_entries = cp->cache()->resolved_field_entries();
+ if (field_entries != nullptr) {
+ for (int i = 0; i < field_entries->length(); i++) {
+ ResolvedFieldEntry* rfe = field_entries->adr_at(i);
+ if (rfe->is_resolved(Bytecodes::_getstatic) ||
+ rfe->is_resolved(Bytecodes::_putstatic) ||
+ rfe->is_resolved(Bytecodes::_getfield) ||
+ rfe->is_resolved(Bytecodes::_putfield)) {
+ list.at_put(rfe->constant_pool_index(), true);
+ print = true;
+ }
+ }
+ }
+
+ Array<ResolvedMethodEntry>* method_entries = cp->cache()->resolved_method_entries();
+ if (method_entries != nullptr) {
+ for (int i = 0; i < method_entries->length(); i++) {
+ ResolvedMethodEntry* rme = method_entries->adr_at(i);
+ if (rme->is_resolved(Bytecodes::_invokevirtual) ||
+ rme->is_resolved(Bytecodes::_invokespecial) ||
+ rme->is_resolved(Bytecodes::_invokeinterface) ||
+ rme->is_resolved(Bytecodes::_invokestatic) ||
+ rme->is_resolved(Bytecodes::_invokehandle)) {
+ list.at_put(rme->constant_pool_index(), true);
+ print = true;
+ }
+ }
+ }
+ }
+
+ if (print) {
+ outputStream* stream = _classlist_file;
+ stream->print("@cp %s", ik->name()->as_C_string());
+ for (int i = 0; i < list.length(); i++) {
+ if (list.at(i)) {
+ constantTag cp_tag = cp->tag_at(i).value();
+ assert(cp_tag.value() == JVM_CONSTANT_Class ||
+ cp_tag.value() == JVM_CONSTANT_Fieldref ||
+ cp_tag.value() == JVM_CONSTANT_Methodref||
+ cp_tag.value() == JVM_CONSTANT_InterfaceMethodref ||
+ cp_tag.value() == JVM_CONSTANT_InvokeDynamic, "sanity");
+ stream->print(" %d", i);
+ }
+ }
+ stream->cr();
+ }
+ }
+
+ void ClassListWriter::write_loader_negative_lookup_cache_for(oop loader, const char* loader_type) {
+ TempNewSymbol method = SymbolTable::new_symbol("negativeLookupCacheContents");
+ TempNewSymbol signature = SymbolTable::new_symbol("()Ljava/lang/String;");
+
+ EXCEPTION_MARK;
+ HandleMark hm(THREAD);
+
+ JavaValue result(T_OBJECT);
+ JavaCalls::call_virtual(&result,
+ Handle(THREAD, loader),
+ loader->klass(),
+ method,
+ signature,
+ CHECK);
+
+ if (HAS_PENDING_EXCEPTION) {
+ log_warning(cds)("Error during BuiltinClassLoader::negativeLookupCacheContents() call for %s loader", loader_type);
+ CLEAR_PENDING_EXCEPTION;
+ return;
+ } else if (result.get_oop() == nullptr) {
+ return;
+ }
+
+ ResourceMark rm;
+ const char* cache_contents = java_lang_String::as_utf8_string(result.get_oop());
+ log_debug(cds)("%s loader negative cache: %s", loader_type, cache_contents);
+
+ outputStream* stream = _classlist_file;
+ const size_t buffer_size = strlen(ClassListParser::LOADER_NEGATIVE_CACHE_TAG) + 1 /* for space*/
+ + strlen(loader_type) + 1 /* for space */ + strlen(cache_contents) + 1 /* for null character */;
+ char* buffer = NEW_C_HEAP_ARRAY(char, buffer_size, mtInternal);
+ _classlist_file->set_scratch_buffer(buffer, buffer_size);
+ MutexLocker lock2(ClassListFile_lock, Mutex::_no_safepoint_check_flag);
+ stream->print("%s %s %s", ClassListParser::LOADER_NEGATIVE_CACHE_TAG, loader_type, cache_contents);
+ stream->cr();
+ _classlist_file->set_scratch_buffer(nullptr, 0);
+ }
+
+ void ClassListWriter::write_loader_negative_lookup_cache() {
+ if (!is_enabled()) {
+ return;
+ }
+
+ write_loader_negative_lookup_cache_for(SystemDictionary::java_platform_loader(), "platform");
+ write_loader_negative_lookup_cache_for(SystemDictionary::java_system_loader(), "app");
+ }
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