< prev index next > src/hotspot/share/cds/aotConstantPoolResolver.cpp
Print this page
* questions.
*
*/
#include "cds/aotClassLinker.hpp"
+ #include "cds/aotClassLocation.hpp"
#include "cds/aotConstantPoolResolver.hpp"
+ #include "cds/aotLogging.hpp"
#include "cds/archiveBuilder.hpp"
+ #include "cds/archiveUtils.inline.hpp"
#include "cds/cdsConfig.hpp"
+ #include "cds/classListWriter.hpp"
+ #include "cds/finalImageRecipes.hpp"
+ #include "cds/heapShared.hpp"
+ #include "cds/lambdaFormInvokers.inline.hpp"
+ #include "classfile/classLoader.hpp"
+ #include "classfile/dictionary.hpp"
+ #include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/systemDictionaryShared.hpp"
#include "classfile/vmClasses.hpp"
#include "interpreter/bytecodeStream.hpp"
#include "interpreter/interpreterRuntime.hpp"
#include "memory/resourceArea.hpp"
#include "oops/constantPool.inline.hpp"
+ #include "oops/fieldStreams.inline.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/klass.inline.hpp"
#include "runtime/handles.inline.hpp"
+ #include "runtime/javaCalls.hpp"
+ #include "runtime/signature.hpp"
// Returns true if we CAN PROVE that cp_index will always resolve to
// the same information at both dump time and run time. This is a
// necessary (but not sufficient) condition for pre-resolving cp_index
// during CDS archive assembly.
case JVM_CONSTANT_String:
resolve_string(cp, cp_index, CHECK); // may throw OOM when interning strings.
break;
}
}
+
+ // Normally, we don't want to archive any CP entries that were not resolved
+ // in the training run. Otherwise the AOT/JIT may inline too much code that has not
+ // been executed.
+ //
+ // However, we want to aggressively resolve all klass/field/method constants for
+ // LambdaForm Invoker Holder classes, Lambda Proxy classes, and LambdaForm classes,
+ // so that the compiler can inline through them.
+ if (SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
+ bool eager_resolve = false;
+
+ if (LambdaFormInvokers::may_be_regenerated_class(ik->name())) {
+ eager_resolve = true;
+ }
+ if (ik->is_hidden() && HeapShared::is_archivable_hidden_klass(ik)) {
+ eager_resolve = true;
+ }
+
+ if (eager_resolve) {
+ preresolve_class_cp_entries(THREAD, ik, nullptr);
+ preresolve_field_and_method_cp_entries(THREAD, ik, nullptr);
+ }
+ }
}
// This works only for the boot/platform/app loaders
Klass* AOTConstantPoolResolver::find_loaded_class(Thread* current, oop class_loader, Symbol* name) {
HandleMark hm(current);
BytecodeStream bcs(methodHandle(THREAD, m));
while (!bcs.is_last_bytecode()) {
bcs.next();
Bytecodes::Code raw_bc = bcs.raw_code();
switch (raw_bc) {
+ case Bytecodes::_getstatic:
+ case Bytecodes::_putstatic:
case Bytecodes::_getfield:
case Bytecodes::_putfield:
maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION; // just ignore
break;
case Bytecodes::_invokehandle:
case Bytecodes::_invokespecial:
case Bytecodes::_invokevirtual:
case Bytecodes::_invokeinterface:
+ case Bytecodes::_invokestatic:
maybe_resolve_fmi_ref(ik, m, raw_bc, bcs.get_index_u2(), preresolve_list, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION; // just ignore
}
break;
// Do not resolve any field/methods from a class that has not been loaded yet.
return;
}
Klass* resolved_klass = cp->klass_ref_at(raw_index, bc, CHECK);
+ const char* is_static = "";
switch (bc) {
+ case Bytecodes::_getstatic:
+ case Bytecodes::_putstatic:
+ if (!VM_Version::supports_fast_class_init_checks()) {
+ return; // Do not resolve since interpreter lacks fast clinit barriers support
+ }
+ InterpreterRuntime::resolve_get_put(bc, raw_index, mh, cp, false /*initialize_holder*/, CHECK);
+ is_static = " *** static";
+ break;
case Bytecodes::_getfield:
case Bytecodes::_putfield:
InterpreterRuntime::resolve_get_put(bc, raw_index, mh, cp, false /*initialize_holder*/, CHECK);
break;
+ case Bytecodes::_invokestatic:
+ if (!VM_Version::supports_fast_class_init_checks()) {
+ return; // Do not resolve since interpreter lacks fast clinit barriers support
+ }
+ InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
+ is_static = " *** static";
+ break;
+
case Bytecodes::_invokevirtual:
case Bytecodes::_invokespecial:
case Bytecodes::_invokeinterface:
InterpreterRuntime::cds_resolve_invoke(bc, raw_index, cp, CHECK);
break;
if (log_is_enabled(Trace, aot, resolve)) {
ResourceMark rm(THREAD);
bool resolved = cp->is_resolved(raw_index, bc);
Symbol* name = cp->name_ref_at(raw_index, bc);
Symbol* signature = cp->signature_ref_at(raw_index, bc);
- log_trace(aot, resolve)("%s %s [%3d] %s -> %s.%s:%s",
+ log_trace(aot, resolve)("%s %s [%3d] %s -> %s.%s:%s%s",
(resolved ? "Resolved" : "Failed to resolve"),
Bytecodes::name(bc), cp_index, ik->external_name(),
resolved_klass->external_name(),
- name->as_C_string(), signature->as_C_string());
+ name->as_C_string(), signature->as_C_string(), is_static);
}
}
void AOTConstantPoolResolver::preresolve_indy_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list) {
JavaThread* THREAD = current;
} else {
return ArchiveBuilder::current()->is_in_buffer_space(p);
}
}
#endif
+
+ // Paranoid check -- if any field/method signature in <ik> is referencing a class that is known to be
+ // excluded, do not archive any reflection data in <ik>.
+ bool AOTConstantPoolResolver::check_signature_for_reflection_data(InstanceKlass* ik, Symbol* sig, bool is_method) {
+ precond(SafepointSynchronize::is_at_safepoint());
+ ResourceMark rm;
+ for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) {
+ if (ss.is_reference()) {
+ Symbol* klass_name = ss.as_symbol(/*probe_only=*/true);
+ if (klass_name == nullptr) {
+ // This symbol has never been created during the assembly phase, so it can't
+ // possibly be referencing an excluded class.
+ continue;
+ }
+ if (Signature::is_array(klass_name)) {
+ SignatureStream ss2(klass_name, false);
+ ss2.skip_array_prefix();
+ if (ss2.is_reference() && ss2.as_symbol(/*probe_only=*/true) == nullptr) {
+ // klass_name is an array klass that has not been loaded during the assembly phase, so it can't
+ // possibly be referencing an excluded class.
+ continue;
+ }
+ }
+ Klass* k = find_loaded_class(Thread::current(), ik->class_loader(), klass_name);
+ if (k == nullptr) {
+ // No class of this name has been loaded for this loader, so this name can't
+ // possibly be referencing an excluded class.
+ continue;
+ }
+ if (SystemDictionaryShared::should_be_excluded(k)) {
+ if (log_is_enabled(Warning, aot, resolve)) {
+ ResourceMark rm;
+ log_warning(aot, resolve)("Cannot archive reflection data in %s because it refers to excluded class %s",
+ ik->external_name(), k->external_name());
+ }
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+
+ bool AOTConstantPoolResolver::can_archive_reflection_data_declared_fields(InstanceKlass* ik) {
+ for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
+ if (!check_signature_for_reflection_data(ik, fs.signature(), /*is_method=*/false)) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ bool AOTConstantPoolResolver::can_archive_reflection_data_declared_methods(InstanceKlass* ik) {
+ Array<Method*>* methods = ik->methods();
+ for (int i = 0; i < methods->length(); i++) {
+ Method* m = methods->at(i);
+ if (!check_signature_for_reflection_data(ik, m->signature(), /*is_method=*/true)) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ // This is called by AOT assembly phase to see if java_lang_Class::reflection_data(k) can be
+ // archived.
+ bool AOTConstantPoolResolver::can_archive_reflection_data(InstanceKlass* ik) {
+ // At this point, we have resolved the reflection data of *all* classes
+ // recorded by FinalImageRecipes.
+ // When we are in the AOT safepoint, we will archive the reflection
+ // data of <ik> *only if* it doesn't reference any excluded classes.
+ precond(SafepointSynchronize::is_at_safepoint());
+
+ if (!can_archive_reflection_data_declared_fields(ik)) {
+ return false;
+ }
+ if (!can_archive_reflection_data_declared_methods(ik)) {
+ return false;
+ }
+
+ if (log_is_enabled(Info, aot, resolve)) {
+ ResourceMark rm;
+ log_info(aot, resolve)("Archived reflection data in %s", ik->external_name());
+ }
+
+ return true;
+ }
+
+ int AOTConstantPoolResolver::class_reflection_data_flags(InstanceKlass* ik, TRAPS) {
+ assert(java_lang_Class::has_reflection_data(ik->java_mirror()), "must be");
+
+ HandleMark hm(THREAD);
+ JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
+ JavaValue result(T_INT);
+ JavaCalls::call_special(&result,
+ vmClasses::Class_klass(),
+ vmSymbols::encodeReflectionData_name(),
+ vmSymbols::void_int_signature(),
+ &args, CHECK_0);
+ int flags = result.get_jint();
+ aot_log_info(aot)("Encode ReflectionData: %s (flags=0x%x)", ik->external_name(), flags);
+ return flags;
+ }
+
+ void AOTConstantPoolResolver::generate_reflection_data(JavaThread* current, InstanceKlass* ik, int rd_flags) {
+ aot_log_info(aot)("Generate ReflectionData: %s (flags=" INT32_FORMAT_X ")", ik->external_name(), rd_flags);
+ JavaThread* THREAD = current; // for exception macros
+ JavaCallArguments args(Handle(THREAD, ik->java_mirror()));
+ args.push_int(rd_flags);
+ JavaValue result(T_OBJECT);
+ JavaCalls::call_special(&result,
+ vmClasses::Class_klass(),
+ vmSymbols::generateReflectionData_name(),
+ vmSymbols::int_void_signature(),
+ &args, THREAD);
+ if (HAS_PENDING_EXCEPTION) {
+ Handle exc_handle(THREAD, PENDING_EXCEPTION);
+ CLEAR_PENDING_EXCEPTION;
+
+ log_warning(aot)("Exception during Class::generateReflectionData() call for %s", ik->external_name());
+ LogStreamHandle(Debug, aot) log;
+ if (log.is_enabled()) {
+ java_lang_Throwable::print_stack_trace(exc_handle, &log);
+ }
+ }
+ }
+
+ Klass* AOTConstantPoolResolver::resolve_boot_class_or_fail(const char* class_name, TRAPS) {
+ Handle class_loader;
+ TempNewSymbol class_name_sym = SymbolTable::new_symbol(class_name);
+ return SystemDictionary::resolve_or_fail(class_name_sym, class_loader, true, THREAD);
+ }
+
+ void AOTConstantPoolResolver::trace_dynamic_proxy_class(oop loader, const char* proxy_name, objArrayOop interfaces, int access_flags) {
+ if (interfaces->length() < 1) {
+ return;
+ }
+ if (ClassListWriter::is_enabled()) {
+ const char* loader_name = ArchiveUtils::builtin_loader_name_or_null(loader);
+ if (loader_name != nullptr) {
+ stringStream ss;
+ ss.print("%s %s %d %d", loader_name, proxy_name, access_flags, interfaces->length());
+ for (int i = 0; i < interfaces->length(); i++) {
+ oop mirror = interfaces->obj_at(i);
+ Klass* k = java_lang_Class::as_Klass(mirror);
+ ss.print(" %s", k->name()->as_C_string());
+ }
+ ClassListWriter w; // This locks ClassListFile_lock
+ w.stream()->print_cr("@dynamic-proxy %s", ss.freeze());
+ }
+ }
+ if (CDSConfig::is_dumping_preimage_static_archive()) {
+ FinalImageRecipes::add_dynamic_proxy_class(loader, proxy_name, interfaces, access_flags);
+ }
+ }
+
+ void AOTConstantPoolResolver::init_dynamic_proxy_cache(TRAPS) {
+ static bool inited = false;
+ if (inited) {
+ return;
+ }
+ inited = true;
+
+ Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy", CHECK);
+ TempNewSymbol method = SymbolTable::new_symbol("initCacheForCDS");
+ TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/ClassLoader;)V");
+
+ JavaCallArguments args;
+ args.push_oop(Handle(THREAD, SystemDictionary::java_platform_loader()));
+ args.push_oop(Handle(THREAD, SystemDictionary::java_system_loader()));
+ JavaValue result(T_VOID);
+ JavaCalls::call_static(&result,
+ klass,
+ method,
+ signature,
+ &args, CHECK);
+ }
+
+
+ void AOTConstantPoolResolver::define_dynamic_proxy_class(Handle loader, Handle proxy_name, Handle interfaces, int access_flags, TRAPS) {
+ if (!CDSConfig::is_dumping_dynamic_proxies()) {
+ return;
+ }
+ init_dynamic_proxy_cache(CHECK);
+
+ Klass* klass = resolve_boot_class_or_fail("java/lang/reflect/Proxy$ProxyBuilder", CHECK);
+ TempNewSymbol method = SymbolTable::new_symbol("defineProxyClassForCDS");
+ TempNewSymbol signature = SymbolTable::new_symbol("(Ljava/lang/ClassLoader;Ljava/lang/String;[Ljava/lang/Class;I)Ljava/lang/Class;");
+
+ JavaCallArguments args;
+ args.push_oop(Handle(THREAD, loader()));
+ args.push_oop(Handle(THREAD, proxy_name()));
+ args.push_oop(Handle(THREAD, interfaces()));
+ args.push_int(access_flags);
+ JavaValue result(T_OBJECT);
+ JavaCalls::call_static(&result,
+ klass,
+ method,
+ signature,
+ &args, CHECK);
+
+ // Assumptions:
+ // FMG is archived, which means -modulepath and -Xbootclasspath are both not specified.
+ // All named modules are loaded from the system modules files.
+ // TODO: test support for -Xbootclasspath after JDK-8322322. Some of the code below need to be changed.
+ // TODO: we just give dummy shared_classpath_index for the generated class so that it will be archived.
+ // The index is not used at runtime (see SystemDictionaryShared::load_shared_class_for_builtin_loader, which
+ // uses a null ProtectionDomain for this class)
+ oop mirror = result.get_oop();
+ assert(mirror != nullptr, "class must have been generated if not OOM");
+ InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
+ if (ik->defined_by_boot_loader() || ik->defined_by_platform_loader()) {
+ assert(ik->module()->is_named(), "dynamic proxies defined in unnamed modules for boot/platform loaders not supported");
+ ik->set_shared_classpath_index(0);
+ } else {
+ assert(ik->defined_by_app_loader(), "must be");
+ ik->set_shared_classpath_index(AOTClassLocationConfig::dumptime()->app_cp_start_index());
+ }
+
+ ArchiveBuilder::alloc_stats()->record_dynamic_proxy_class();
+ if (log_is_enabled(Info, cds, dynamic, proxy)) {
+ ResourceMark rm(THREAD);
+ stringStream ss;
+ const char* prefix = "";
+ ss.print("%s (%-7s, cp index = %d) implements ", ik->external_name(),
+ ArchiveUtils::builtin_loader_name(loader()), ik->shared_classpath_index());
+ objArrayOop intfs = (objArrayOop)interfaces();
+ for (int i = 0; i < intfs->length(); i++) {
+ oop intf_mirror = intfs->obj_at(i);
+ ss.print("%s%s", prefix, java_lang_Class::as_Klass(intf_mirror)->external_name());
+ prefix = ", ";
+ }
+
+ log_info(cds, dynamic, proxy)("%s", ss.freeze());
+ }
+ }
< prev index next >