| /* |
| * Copyright (c) 2008, 2016, 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/javaClasses.inline.hpp" |
| #include "classfile/stringTable.hpp" |
| #include "code/codeCache.hpp" |
| #include "code/codeCacheExtensions.hpp" |
| #include "code/dependencyContext.hpp" |
| #include "compiler/compileBroker.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "interpreter/oopMapCache.hpp" |
| #include "interpreter/linkResolver.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "memory/oopFactory.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/objArrayOop.inline.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "prims/methodHandles.hpp" |
| #include "prims/jvmtiRedefineClassesTrace.hpp" |
| #include "runtime/compilationPolicy.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/timerTrace.hpp" |
| #include "runtime/reflection.hpp" |
| #include "runtime/signature.hpp" |
| #include "runtime/stubRoutines.hpp" |
| #include "utilities/exceptions.hpp" |
| |
| |
| /* |
| * JSR 292 reference implementation: method handles |
| * The JDK 7 reference implementation represented method handle |
| * combinations as chains. Each link in the chain had a "vmentry" |
| * field which pointed at a bit of assembly code which performed |
| * one transformation before dispatching to the next link in the chain. |
| * |
| * The current reference implementation pushes almost all code generation |
| * responsibility to (trusted) Java code. A method handle contains a |
| * pointer to its "LambdaForm", which embodies all details of the method |
| * handle's behavior. The LambdaForm is a normal Java object, managed |
| * by a runtime coded in Java. |
| */ |
| |
| bool MethodHandles::_enabled = false; // set true after successful native linkage |
| MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; |
| |
| /** |
| * Generates method handle adapters. Returns 'false' if memory allocation |
| * failed and true otherwise. |
| */ |
| void MethodHandles::generate_adapters() { |
| assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); |
| assert(_adapter_code == NULL, "generate only once"); |
| |
| ResourceMark rm; |
| TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime)); |
| _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); |
| CodeBuffer code(_adapter_code); |
| MethodHandlesAdapterGenerator g(&code); |
| g.generate(); |
| code.log_section_sizes("MethodHandlesAdapterBlob"); |
| } |
| |
| //------------------------------------------------------------------------------ |
| // MethodHandlesAdapterGenerator::generate |
| // |
| void MethodHandlesAdapterGenerator::generate() { |
| // Generate generic method handle adapters. |
| // Generate interpreter entries |
| for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; |
| mk <= Interpreter::method_handle_invoke_LAST; |
| mk = Interpreter::MethodKind(1 + (int)mk)) { |
| vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); |
| StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); |
| address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); |
| if (entry != NULL) { |
| CodeCacheExtensions::handle_generated_pc(entry, vmIntrinsics::name_at(iid)); |
| Interpreter::set_entry_for_kind(mk, entry); |
| } |
| // If the entry is not set, it will throw AbstractMethodError. |
| } |
| } |
| |
| void MethodHandles::set_enabled(bool z) { |
| if (_enabled != z) { |
| guarantee(z, "can only enable once"); |
| _enabled = z; |
| } |
| } |
| |
| // MemberName support |
| |
| // import java_lang_invoke_MemberName.* |
| enum { |
| IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, |
| IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, |
| IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, |
| IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, |
| CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, |
| REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, |
| REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, |
| SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, |
| SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, |
| ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE |
| }; |
| |
| Handle MethodHandles::new_MemberName(TRAPS) { |
| Handle empty; |
| instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); |
| if (!k->is_initialized()) k->initialize(CHECK_(empty)); |
| return Handle(THREAD, k->allocate_instance(THREAD)); |
| } |
| |
| oop MethodHandles::init_MemberName(Handle mname, Handle target) { |
| // This method is used from java.lang.invoke.MemberName constructors. |
| // It fills in the new MemberName from a java.lang.reflect.Member. |
| Thread* thread = Thread::current(); |
| oop target_oop = target(); |
| Klass* target_klass = target_oop->klass(); |
| if (target_klass == SystemDictionary::reflect_Field_klass()) { |
| oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() |
| int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() |
| KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); |
| if (!k.is_null() && k->is_instance_klass()) { |
| fieldDescriptor fd(InstanceKlass::cast(k()), slot); |
| oop mname2 = init_field_MemberName(mname, fd); |
| if (mname2 != NULL) { |
| // Since we have the reified name and type handy, add them to the result. |
| if (java_lang_invoke_MemberName::name(mname2) == NULL) |
| java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); |
| if (java_lang_invoke_MemberName::type(mname2) == NULL) |
| java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); |
| } |
| return mname2; |
| } |
| } else if (target_klass == SystemDictionary::reflect_Method_klass()) { |
| oop clazz = java_lang_reflect_Method::clazz(target_oop); |
| int slot = java_lang_reflect_Method::slot(target_oop); |
| KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); |
| if (!k.is_null() && k->is_instance_klass()) { |
| Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); |
| if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) |
| return NULL; // do not resolve unless there is a concrete signature |
| CallInfo info(m, k()); |
| return init_method_MemberName(mname, info); |
| } |
| } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { |
| oop clazz = java_lang_reflect_Constructor::clazz(target_oop); |
| int slot = java_lang_reflect_Constructor::slot(target_oop); |
| KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); |
| if (!k.is_null() && k->is_instance_klass()) { |
| Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); |
| if (m == NULL) return NULL; |
| CallInfo info(m, k()); |
| return init_method_MemberName(mname, info); |
| } |
| } |
| return NULL; |
| } |
| |
| oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { |
| assert(info.resolved_appendix().is_null(), "only normal methods here"); |
| methodHandle m = info.resolved_method(); |
| assert(m.not_null(), "null method handle"); |
| KlassHandle m_klass = m->method_holder(); |
| assert(m.not_null(), "null holder for method handle"); |
| int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); |
| int vmindex = Method::invalid_vtable_index; |
| |
| switch (info.call_kind()) { |
| case CallInfo::itable_call: |
| vmindex = info.itable_index(); |
| // More importantly, the itable index only works with the method holder. |
| assert(m_klass->verify_itable_index(vmindex), ""); |
| flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); |
| if (TraceInvokeDynamic) { |
| ttyLocker ttyl; |
| ResourceMark rm; |
| tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", |
| Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), |
| vmindex); |
| m->access_flags().print_on(tty); |
| if (!m->is_abstract()) { |
| tty->print("default"); |
| } |
| tty->cr(); |
| } |
| break; |
| |
| case CallInfo::vtable_call: |
| vmindex = info.vtable_index(); |
| flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); |
| assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe"); |
| if (m_klass->is_interface()) { |
| // This is a vtable call to an interface method (abstract "miranda method" or default method). |
| // The vtable index is meaningless without a class (not interface) receiver type, so get one. |
| // (LinkResolver should help us figure this out.) |
| KlassHandle m_klass_non_interface = info.resolved_klass(); |
| if (m_klass_non_interface->is_interface()) { |
| m_klass_non_interface = SystemDictionary::Object_klass(); |
| #ifdef ASSERT |
| { ResourceMark rm; |
| Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); |
| assert(m->name() == m2->name() && m->signature() == m2->signature(), |
| "at %d, %s != %s", vmindex, |
| m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); |
| } |
| #endif //ASSERT |
| } |
| if (!m->is_public()) { |
| assert(m->is_public(), "virtual call must be to public interface method"); |
| return NULL; // elicit an error later in product build |
| } |
| assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); |
| m_klass = m_klass_non_interface; |
| } |
| if (TraceInvokeDynamic) { |
| ttyLocker ttyl; |
| ResourceMark rm; |
| tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", |
| Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), |
| m_klass->internal_name(), vmindex); |
| m->access_flags().print_on(tty); |
| if (m->is_default_method()) { |
| tty->print("default"); |
| } |
| tty->cr(); |
| } |
| break; |
| |
| case CallInfo::direct_call: |
| vmindex = Method::nonvirtual_vtable_index; |
| if (m->is_static()) { |
| flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); |
| } else if (m->is_initializer()) { |
| flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); |
| } else { |
| flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); |
| } |
| break; |
| |
| default: assert(false, "bad CallInfo"); return NULL; |
| } |
| |
| // @CallerSensitive annotation detected |
| if (m->caller_sensitive()) { |
| flags |= CALLER_SENSITIVE; |
| } |
| |
| oop mname_oop = mname(); |
| java_lang_invoke_MemberName::set_flags( mname_oop, flags); |
| java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); |
| java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index |
| java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); |
| // Note: name and type can be lazily computed by resolve_MemberName, |
| // if Java code needs them as resolved String and MethodType objects. |
| // The clazz must be eagerly stored, because it provides a GC |
| // root to help keep alive the Method*. |
| // If relevant, the vtable or itable value is stored as vmindex. |
| // This is done eagerly, since it is readily available without |
| // constructing any new objects. |
| // TO DO: maybe intern mname_oop |
| if (m->method_holder()->add_member_name(mname)) { |
| return mname(); |
| } else { |
| // Redefinition caused this to fail. Return NULL (and an exception?) |
| return NULL; |
| } |
| } |
| |
| oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { |
| int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); |
| flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); |
| if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); |
| Metadata* vmtarget = fd.field_holder(); |
| int vmindex = fd.offset(); // determines the field uniquely when combined with static bit |
| oop mname_oop = mname(); |
| java_lang_invoke_MemberName::set_flags(mname_oop, flags); |
| java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); |
| java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); |
| java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); |
| oop type = field_signature_type_or_null(fd.signature()); |
| oop name = field_name_or_null(fd.name()); |
| if (name != NULL) |
| java_lang_invoke_MemberName::set_name(mname_oop, name); |
| if (type != NULL) |
| java_lang_invoke_MemberName::set_type(mname_oop, type); |
| // Note: name and type can be lazily computed by resolve_MemberName, |
| // if Java code needs them as resolved String and Class objects. |
| // Note that the incoming type oop might be pre-resolved (non-null). |
| // The base clazz and field offset (vmindex) must be eagerly stored, |
| // because they unambiguously identify the field. |
| // Although the fieldDescriptor::_index would also identify the field, |
| // we do not use it, because it is harder to decode. |
| // TO DO: maybe intern mname_oop |
| return mname(); |
| } |
| |
| // JVM 2.9 Special Methods: |
| // A method is signature polymorphic if and only if all of the following conditions hold : |
| // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. |
| // * It has a single formal parameter of type Object[]. |
| // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. |
| // * It has the ACC_VARARGS and ACC_NATIVE flags set. |
| bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { |
| if (klass == NULL) |
| return false; |
| // The following test will fail spuriously during bootstrap of MethodHandle itself: |
| // if (klass != SystemDictionary::MethodHandle_klass()) |
| // Test the name instead: |
| if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && |
| klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { |
| return false; |
| } |
| |
| // Look up signature polymorphic method with polymorphic return type |
| Symbol* poly_sig = vmSymbols::object_array_object_signature(); |
| InstanceKlass* iklass = InstanceKlass::cast(klass); |
| Method* m = iklass->find_method(name, poly_sig); |
| if (m != NULL) { |
| int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; |
| int flags = m->access_flags().as_int(); |
| if ((flags & required) == required) { |
| return true; |
| } |
| } |
| |
| // Look up signature polymorphic method with non-polymorphic (non Object) return type |
| int me; |
| int ms = iklass->find_method_by_name(name, &me); |
| if (ms == -1) return false; |
| for (; ms < me; ms++) { |
| Method* m = iklass->methods()->at(ms); |
| int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; |
| int flags = m->access_flags().as_int(); |
| if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| |
| Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { |
| assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); |
| switch (iid) { |
| case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); |
| case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); |
| case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); |
| case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); |
| case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); |
| } |
| fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); |
| return 0; |
| } |
| |
| Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { |
| switch(id) { |
| case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; |
| case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; |
| case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; |
| case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; |
| case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; |
| default: |
| fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); |
| return Bytecodes::_illegal; |
| } |
| } |
| |
| int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { |
| switch (iid) { |
| case vmIntrinsics::_invokeBasic: return 0; |
| case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; |
| case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; |
| case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; |
| case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; |
| } |
| fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); |
| return 0; |
| } |
| |
| vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { |
| vmSymbols::SID name_id = vmSymbols::find_sid(name); |
| switch (name_id) { |
| // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. |
| case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; |
| // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: |
| case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; |
| |
| // There is one static signature-polymorphic method for each JVM invocation mode. |
| case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; |
| case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; |
| case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; |
| case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; |
| } |
| |
| // Cover the case of invokeExact and any future variants of invokeFoo. |
| Klass* mh_klass = SystemDictionary::well_known_klass( |
| SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); |
| if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) { |
| return vmIntrinsics::_invokeGeneric; |
| } |
| |
| // Cover the case of methods on VarHandle. |
| Klass* vh_klass = SystemDictionary::well_known_klass( |
| SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) ); |
| if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) { |
| return vmIntrinsics::_invokeGeneric; |
| } |
| |
| // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. |
| // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. |
| return vmIntrinsics::_none; |
| } |
| |
| vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { |
| if (klass != NULL && |
| (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || |
| klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { |
| vmIntrinsics::ID iid = signature_polymorphic_name_id(name); |
| if (iid != vmIntrinsics::_none) |
| return iid; |
| if (is_method_handle_invoke_name(klass, name)) |
| return vmIntrinsics::_invokeGeneric; |
| } |
| return vmIntrinsics::_none; |
| } |
| |
| |
| // convert the external string or reflective type to an internal signature |
| Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { |
| if (java_lang_invoke_MethodType::is_instance(type_str)) { |
| return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); |
| } else if (java_lang_Class::is_instance(type_str)) { |
| return java_lang_Class::as_signature(type_str, false, THREAD); |
| } else if (java_lang_String::is_instance_inlined(type_str)) { |
| if (intern_if_not_found) { |
| return java_lang_String::as_symbol(type_str, THREAD); |
| } else { |
| return java_lang_String::as_symbol_or_null(type_str); |
| } |
| } else { |
| THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); |
| } |
| } |
| |
| static const char OBJ_SIG[] = "Ljava/lang/Object;"; |
| enum { OBJ_SIG_LEN = 18 }; |
| |
| bool MethodHandles::is_basic_type_signature(Symbol* sig) { |
| assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); |
| assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); |
| const int len = sig->utf8_length(); |
| for (int i = 0; i < len; i++) { |
| switch (sig->byte_at(i)) { |
| case 'L': |
| // only java/lang/Object is valid here |
| if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) |
| return false; |
| i += OBJ_SIG_LEN-1; //-1 because of i++ in loop |
| continue; |
| case '(': case ')': case 'V': |
| case 'I': case 'J': case 'F': case 'D': |
| continue; |
| //case '[': |
| //case 'Z': case 'B': case 'C': case 'S': |
| default: |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { |
| Symbol* bsig = NULL; |
| if (sig == NULL) { |
| return sig; |
| } else if (is_basic_type_signature(sig)) { |
| sig->increment_refcount(); |
| return sig; // that was easy |
| } else if (sig->byte_at(0) != '(') { |
| BasicType bt = char2type(sig->byte_at(0)); |
| if (is_subword_type(bt)) { |
| bsig = vmSymbols::int_signature(); |
| } else { |
| assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); |
| bsig = vmSymbols::object_signature(); |
| } |
| } else { |
| ResourceMark rm; |
| stringStream buffer(128); |
| buffer.put('('); |
| int arg_pos = 0, keep_arg_pos = -1; |
| if (keep_last_arg) |
| keep_arg_pos = ArgumentCount(sig).size() - 1; |
| for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { |
| BasicType bt = ss.type(); |
| size_t this_arg_pos = buffer.size(); |
| if (ss.at_return_type()) { |
| buffer.put(')'); |
| } |
| if (arg_pos == keep_arg_pos) { |
| buffer.write((char*) ss.raw_bytes(), |
| (int) ss.raw_length()); |
| } else if (bt == T_OBJECT || bt == T_ARRAY) { |
| buffer.write(OBJ_SIG, OBJ_SIG_LEN); |
| } else { |
| if (is_subword_type(bt)) |
| bt = T_INT; |
| buffer.put(type2char(bt)); |
| } |
| arg_pos++; |
| } |
| const char* sigstr = buffer.base(); |
| int siglen = (int) buffer.size(); |
| bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); |
| } |
| assert(is_basic_type_signature(bsig) || |
| // detune assert in case the injected argument is not a basic type: |
| keep_last_arg, ""); |
| return bsig; |
| } |
| |
| void MethodHandles::print_as_basic_type_signature_on(outputStream* st, |
| Symbol* sig, |
| bool keep_arrays, |
| bool keep_basic_names) { |
| st = st ? st : tty; |
| int len = sig->utf8_length(); |
| int array = 0; |
| bool prev_type = false; |
| for (int i = 0; i < len; i++) { |
| char ch = sig->byte_at(i); |
| switch (ch) { |
| case '(': case ')': |
| prev_type = false; |
| st->put(ch); |
| continue; |
| case '[': |
| if (!keep_basic_names && keep_arrays) |
| st->put(ch); |
| array++; |
| continue; |
| case 'L': |
| { |
| if (prev_type) st->put(','); |
| int start = i+1, slash = start; |
| while (++i < len && (ch = sig->byte_at(i)) != ';') { |
| if (ch == '/' || ch == '.' || ch == '$') slash = i+1; |
| } |
| if (slash < i) start = slash; |
| if (!keep_basic_names) { |
| st->put('L'); |
| } else { |
| for (int j = start; j < i; j++) |
| st->put(sig->byte_at(j)); |
| prev_type = true; |
| } |
| break; |
| } |
| default: |
| { |
| if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { |
| ch = '['; |
| array = 0; |
| } |
| if (prev_type) st->put(','); |
| const char* n = NULL; |
| if (keep_basic_names) |
| n = type2name(char2type(ch)); |
| if (n == NULL) { |
| // unknown letter, or we don't want to know its name |
| st->put(ch); |
| } else { |
| st->print("%s", n); |
| prev_type = true; |
| } |
| break; |
| } |
| } |
| // Switch break goes here to take care of array suffix: |
| if (prev_type) { |
| while (array > 0) { |
| st->print("[]"); |
| --array; |
| } |
| } |
| array = 0; |
| } |
| } |
| |
| |
| |
| static oop object_java_mirror() { |
| return SystemDictionary::Object_klass()->java_mirror(); |
| } |
| |
| oop MethodHandles::field_name_or_null(Symbol* s) { |
| if (s == NULL) return NULL; |
| return StringTable::lookup(s); |
| } |
| |
| oop MethodHandles::field_signature_type_or_null(Symbol* s) { |
| if (s == NULL) return NULL; |
| BasicType bt = FieldType::basic_type(s); |
| if (is_java_primitive(bt)) { |
| assert(s->utf8_length() == 1, ""); |
| return java_lang_Class::primitive_mirror(bt); |
| } |
| // Here are some more short cuts for common types. |
| // They are optional, since reference types can be resolved lazily. |
| if (bt == T_OBJECT) { |
| if (s == vmSymbols::object_signature()) { |
| return object_java_mirror(); |
| } else if (s == vmSymbols::class_signature()) { |
| return SystemDictionary::Class_klass()->java_mirror(); |
| } else if (s == vmSymbols::string_signature()) { |
| return SystemDictionary::String_klass()->java_mirror(); |
| } |
| } |
| return NULL; |
| } |
| |
| |
| // An unresolved member name is a mere symbolic reference. |
| // Resolving it plants a vmtarget/vmindex in it, |
| // which refers directly to JVM internals. |
| Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) { |
| Handle empty; |
| assert(java_lang_invoke_MemberName::is_instance(mname()), ""); |
| |
| if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { |
| // Already resolved. |
| DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); |
| assert(vmindex >= Method::nonvirtual_vtable_index, ""); |
| return mname; |
| } |
| |
| Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); |
| Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); |
| Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); |
| int flags = java_lang_invoke_MemberName::flags(mname()); |
| int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; |
| if (!ref_kind_is_valid(ref_kind)) { |
| THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); |
| } |
| |
| DEBUG_ONLY(int old_vmindex); |
| assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); |
| |
| if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { |
| THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); |
| } |
| |
| instanceKlassHandle defc; |
| { |
| Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); |
| if (defc_klass == NULL) return empty; // a primitive; no resolution possible |
| if (!defc_klass->is_instance_klass()) { |
| if (!defc_klass->is_array_klass()) return empty; |
| defc_klass = SystemDictionary::Object_klass(); |
| } |
| defc = instanceKlassHandle(THREAD, defc_klass); |
| } |
| if (defc.is_null()) { |
| THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); |
| } |
| defc->link_class(CHECK_(empty)); // possible safepoint |
| |
| // convert the external string name to an internal symbol |
| TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); |
| if (name == NULL) return empty; // no such name |
| if (name == vmSymbols::class_initializer_name()) |
| return empty; // illegal name |
| |
| vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; |
| if ((flags & ALL_KINDS) == IS_METHOD && |
| (defc() == SystemDictionary::MethodHandle_klass()) && |
| (ref_kind == JVM_REF_invokeVirtual || |
| ref_kind == JVM_REF_invokeSpecial || |
| // static invocation mode is required for _linkToVirtual, etc.: |
| ref_kind == JVM_REF_invokeStatic)) { |
| vmIntrinsics::ID iid = signature_polymorphic_name_id(name); |
| if (iid != vmIntrinsics::_none && |
| ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { |
| // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. |
| // For a static reference it could an internal linkage routine like _linkToVirtual, etc. |
| mh_invoke_id = iid; |
| } |
| } |
| |
| // convert the external string or reflective type to an internal signature |
| TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); |
| if (type == NULL) return empty; // no such signature exists in the VM |
| |
| // Time to do the lookup. |
| switch (flags & ALL_KINDS) { |
| case IS_METHOD: |
| { |
| CallInfo result; |
| LinkInfo link_info(defc, name, type, caller, caller.not_null()); |
| { |
| assert(!HAS_PENDING_EXCEPTION, ""); |
| if (ref_kind == JVM_REF_invokeStatic) { |
| LinkResolver::resolve_static_call(result, |
| link_info, false, THREAD); |
| } else if (ref_kind == JVM_REF_invokeInterface) { |
| LinkResolver::resolve_interface_call(result, Handle(), defc, |
| link_info, false, THREAD); |
| } else if (mh_invoke_id != vmIntrinsics::_none) { |
| assert(!is_signature_polymorphic_static(mh_invoke_id), ""); |
| LinkResolver::resolve_handle_call(result, link_info, THREAD); |
| } else if (ref_kind == JVM_REF_invokeSpecial) { |
| LinkResolver::resolve_special_call(result, |
| link_info, THREAD); |
| } else if (ref_kind == JVM_REF_invokeVirtual) { |
| LinkResolver::resolve_virtual_call(result, Handle(), defc, |
| link_info, false, THREAD); |
| } else { |
| assert(false, "ref_kind=%d", ref_kind); |
| } |
| if (HAS_PENDING_EXCEPTION) { |
| return empty; |
| } |
| } |
| if (result.resolved_appendix().not_null()) { |
| // The resolved MemberName must not be accompanied by an appendix argument, |
| // since there is no way to bind this value into the MemberName. |
| // Caller is responsible to prevent this from happening. |
| THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); |
| } |
| oop mname2 = init_method_MemberName(mname, result); |
| return Handle(THREAD, mname2); |
| } |
| case IS_CONSTRUCTOR: |
| { |
| CallInfo result; |
| LinkInfo link_info(defc, name, type, caller, caller.not_null()); |
| { |
| assert(!HAS_PENDING_EXCEPTION, ""); |
| if (name == vmSymbols::object_initializer_name()) { |
| LinkResolver::resolve_special_call(result, link_info, THREAD); |
| } else { |
| break; // will throw after end of switch |
| } |
| if (HAS_PENDING_EXCEPTION) { |
| return empty; |
| } |
| } |
| assert(result.is_statically_bound(), ""); |
| oop mname2 = init_method_MemberName(mname, result); |
| return Handle(THREAD, mname2); |
| } |
| case IS_FIELD: |
| { |
| fieldDescriptor result; // find_field initializes fd if found |
| { |
| assert(!HAS_PENDING_EXCEPTION, ""); |
| LinkInfo link_info(defc, name, type, caller, /*check_access*/false); |
| LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); |
| if (HAS_PENDING_EXCEPTION) { |
| return empty; |
| } |
| } |
| oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); |
| return Handle(THREAD, mname2); |
| } |
| default: |
| THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); |
| } |
| |
| return empty; |
| } |
| |
| // Conversely, a member name which is only initialized from JVM internals |
| // may have null defc, name, and type fields. |
| // Resolving it plants a vmtarget/vmindex in it, |
| // which refers directly to JVM internals. |
| void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { |
| assert(java_lang_invoke_MemberName::is_instance(mname()), ""); |
| Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
| int vmindex = java_lang_invoke_MemberName::vmindex(mname()); |
| if (vmtarget == NULL) { |
| THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); |
| } |
| |
| bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); |
| bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); |
| bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); |
| int flags = java_lang_invoke_MemberName::flags(mname()); |
| |
| if (suppress != 0) { |
| if (suppress & _suppress_defc) have_defc = true; |
| if (suppress & _suppress_name) have_name = true; |
| if (suppress & _suppress_type) have_type = true; |
| } |
| |
| if (have_defc && have_name && have_type) return; // nothing needed |
| |
| switch (flags & ALL_KINDS) { |
| case IS_METHOD: |
| case IS_CONSTRUCTOR: |
| { |
| assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); |
| methodHandle m(THREAD, (Method*)vmtarget); |
| DEBUG_ONLY(vmtarget = NULL); // safety |
| if (m.is_null()) break; |
| if (!have_defc) { |
| InstanceKlass* defc = m->method_holder(); |
| java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); |
| } |
| if (!have_name) { |
| //not java_lang_String::create_from_symbol; let's intern member names |
| Handle name = StringTable::intern(m->name(), CHECK); |
| java_lang_invoke_MemberName::set_name(mname(), name()); |
| } |
| if (!have_type) { |
| Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); |
| java_lang_invoke_MemberName::set_type(mname(), type()); |
| } |
| return; |
| } |
| case IS_FIELD: |
| { |
| assert(vmtarget->is_klass(), "field vmtarget is Klass*"); |
| if (!((Klass*) vmtarget)->is_instance_klass()) break; |
| instanceKlassHandle defc(THREAD, (Klass*) vmtarget); |
| DEBUG_ONLY(vmtarget = NULL); // safety |
| bool is_static = ((flags & JVM_ACC_STATIC) != 0); |
| fieldDescriptor fd; // find_field initializes fd if found |
| if (!defc->find_field_from_offset(vmindex, is_static, &fd)) |
| break; // cannot expand |
| if (!have_defc) { |
| java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); |
| } |
| if (!have_name) { |
| //not java_lang_String::create_from_symbol; let's intern member names |
| Handle name = StringTable::intern(fd.name(), CHECK); |
| java_lang_invoke_MemberName::set_name(mname(), name()); |
| } |
| if (!have_type) { |
| // If it is a primitive field type, don't mess with short strings like "I". |
| Handle type = field_signature_type_or_null(fd.signature()); |
| if (type.is_null()) { |
| java_lang_String::create_from_symbol(fd.signature(), CHECK); |
| } |
| java_lang_invoke_MemberName::set_type(mname(), type()); |
| } |
| return; |
| } |
| } |
| THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); |
| } |
| |
| int MethodHandles::find_MemberNames(KlassHandle k, |
| Symbol* name, Symbol* sig, |
| int mflags, KlassHandle caller, |
| int skip, objArrayHandle results) { |
| // %%% take caller into account! |
| |
| Thread* thread = Thread::current(); |
| |
| if (k.is_null() || !k->is_instance_klass()) return -1; |
| |
| int rfill = 0, rlimit = results->length(), rskip = skip; |
| // overflow measurement: |
| int overflow = 0, overflow_limit = MAX2(1000, rlimit); |
| |
| int match_flags = mflags; |
| bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); |
| bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); |
| bool local_only = !(search_superc | search_intfc); |
| bool classes_only = false; |
| |
| if (name != NULL) { |
| if (name->utf8_length() == 0) return 0; // a match is not possible |
| } |
| if (sig != NULL) { |
| if (sig->utf8_length() == 0) return 0; // a match is not possible |
| if (sig->byte_at(0) == '(') |
| match_flags &= ~(IS_FIELD | IS_TYPE); |
| else |
| match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); |
| } |
| |
| if ((match_flags & IS_TYPE) != 0) { |
| // NYI, and Core Reflection works quite well for this query |
| } |
| |
| if ((match_flags & IS_FIELD) != 0) { |
| for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { |
| if (name != NULL && st.name() != name) |
| continue; |
| if (sig != NULL && st.signature() != sig) |
| continue; |
| // passed the filters |
| if (rskip > 0) { |
| --rskip; |
| } else if (rfill < rlimit) { |
| Handle result(thread, results->obj_at(rfill++)); |
| if (!java_lang_invoke_MemberName::is_instance(result())) |
| return -99; // caller bug! |
| oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); |
| if (saved != result()) |
| results->obj_at_put(rfill-1, saved); // show saved instance to user |
| } else if (++overflow >= overflow_limit) { |
| match_flags = 0; break; // got tired of looking at overflow |
| } |
| } |
| } |
| |
| if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { |
| // watch out for these guys: |
| Symbol* init_name = vmSymbols::object_initializer_name(); |
| Symbol* clinit_name = vmSymbols::class_initializer_name(); |
| if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> |
| bool negate_name_test = false; |
| // fix name so that it captures the intention of IS_CONSTRUCTOR |
| if (!(match_flags & IS_METHOD)) { |
| // constructors only |
| if (name == NULL) { |
| name = init_name; |
| } else if (name != init_name) { |
| return 0; // no constructors of this method name |
| } |
| } else if (!(match_flags & IS_CONSTRUCTOR)) { |
| // methods only |
| if (name == NULL) { |
| name = init_name; |
| negate_name_test = true; // if we see the name, we *omit* the entry |
| } else if (name == init_name) { |
| return 0; // no methods of this constructor name |
| } |
| } else { |
| // caller will accept either sort; no need to adjust name |
| } |
| for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { |
| Method* m = st.method(); |
| Symbol* m_name = m->name(); |
| if (m_name == clinit_name) |
| continue; |
| if (name != NULL && ((m_name != name) ^ negate_name_test)) |
| continue; |
| if (sig != NULL && m->signature() != sig) |
| continue; |
| // passed the filters |
| if (rskip > 0) { |
| --rskip; |
| } else if (rfill < rlimit) { |
| Handle result(thread, results->obj_at(rfill++)); |
| if (!java_lang_invoke_MemberName::is_instance(result())) |
| return -99; // caller bug! |
| CallInfo info(m); |
| oop saved = MethodHandles::init_method_MemberName(result, info); |
| if (saved != result()) |
| results->obj_at_put(rfill-1, saved); // show saved instance to user |
| } else if (++overflow >= overflow_limit) { |
| match_flags = 0; break; // got tired of looking at overflow |
| } |
| } |
| } |
| |
| // return number of elements we at leasted wanted to initialize |
| return rfill + overflow; |
| } |
| |
| // Is it safe to remove stale entries from a dependency list? |
| static bool safe_to_expunge() { |
| // Since parallel GC threads can concurrently iterate over a dependency |
| // list during safepoint, it is safe to remove entries only when |
| // CodeCache lock is held. |
| return CodeCache_lock->owned_by_self(); |
| } |
| |
| void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { |
| assert_locked_or_safepoint(CodeCache_lock); |
| |
| oop context = java_lang_invoke_CallSite::context(call_site); |
| DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); |
| // Try to purge stale entries on updates. |
| // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, |
| // in order to avoid memory leak, stale entries are purged whenever a dependency list |
| // is changed (both on addition and removal). Though memory reclamation is delayed, |
| // it avoids indefinite memory usage growth. |
| deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); |
| } |
| |
| void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { |
| assert_locked_or_safepoint(CodeCache_lock); |
| |
| oop context = java_lang_invoke_CallSite::context(call_site); |
| DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); |
| deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); |
| } |
| |
| void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { |
| assert_lock_strong(Compile_lock); |
| |
| int marked = 0; |
| CallSiteDepChange changes(call_site(), target()); |
| { |
| NoSafepointVerifier nsv; |
| MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
| |
| oop context = java_lang_invoke_CallSite::context(call_site()); |
| DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); |
| marked = deps.mark_dependent_nmethods(changes); |
| } |
| if (marked > 0) { |
| // At least one nmethod has been marked for deoptimization. |
| VM_Deoptimize op; |
| VMThread::execute(&op); |
| } |
| } |
| |
| //------------------------------------------------------------------------------ |
| // MemberNameTable |
| // |
| |
| MemberNameTable::MemberNameTable(int methods_cnt) |
| : GrowableArray<jweak>(methods_cnt, true) { |
| assert_locked_or_safepoint(MemberNameTable_lock); |
| } |
| |
| MemberNameTable::~MemberNameTable() { |
| assert_locked_or_safepoint(MemberNameTable_lock); |
| int len = this->length(); |
| |
| for (int idx = 0; idx < len; idx++) { |
| jweak ref = this->at(idx); |
| JNIHandles::destroy_weak_global(ref); |
| } |
| } |
| |
| void MemberNameTable::add_member_name(jweak mem_name_wref) { |
| assert_locked_or_safepoint(MemberNameTable_lock); |
| this->push(mem_name_wref); |
| } |
| |
| #if INCLUDE_JVMTI |
| // It is called at safepoint only for RedefineClasses |
| void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) { |
| assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); |
| // For each redefined method |
| for (int idx = 0; idx < length(); idx++) { |
| oop mem_name = JNIHandles::resolve(this->at(idx)); |
| if (mem_name == NULL) { |
| continue; |
| } |
| Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); |
| |
| if (old_method == NULL || !old_method->is_old()) { |
| continue; // skip uninteresting entries |
| } |
| if (old_method->is_deleted()) { |
| // skip entries with deleted methods |
| continue; |
| } |
| Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); |
| |
| assert(new_method != NULL, "method_with_idnum() should not be NULL"); |
| assert(old_method != new_method, "sanity check"); |
| |
| java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method); |
| |
| if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { |
| if (!(*trace_name_printed)) { |
| // RC_TRACE_MESG macro has an embedded ResourceMark |
| RC_TRACE_MESG(("adjust: name=%s", |
| old_method->method_holder()->external_name())); |
| *trace_name_printed = true; |
| } |
| // RC_TRACE macro has an embedded ResourceMark |
| RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", |
| new_method->name()->as_C_string(), |
| new_method->signature()->as_C_string())); |
| } |
| } |
| } |
| #endif // INCLUDE_JVMTI |
| |
| // |
| // Here are the native methods in java.lang.invoke.MethodHandleNatives |
| // They are the private interface between this JVM and the HotSpot-specific |
| // Java code that implements JSR 292 method handles. |
| // |
| // Note: We use a JVM_ENTRY macro to define each of these, for this is the way |
| // that intrinsic (non-JNI) native methods are defined in HotSpot. |
| // |
| |
| #ifndef PRODUCT |
| #define EACH_NAMED_CON(template, requirement) \ |
| template(java_lang_invoke_MemberName,MN_IS_METHOD) \ |
| template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ |
| template(java_lang_invoke_MemberName,MN_IS_FIELD) \ |
| template(java_lang_invoke_MemberName,MN_IS_TYPE) \ |
| template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ |
| template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ |
| template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ |
| template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ |
| template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ |
| /*end*/ |
| |
| #define IGNORE_REQ(req_expr) /* req_expr */ |
| #define ONE_PLUS(scope,value) 1+ |
| static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; |
| #define VALUE_COMMA(scope,value) scope::value, |
| static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; |
| #define STRING_NULL(scope,value) #value "\0" |
| static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; |
| |
| static bool advertise_con_value(int which) { |
| if (which < 0) return false; |
| bool ok = true; |
| int count = 0; |
| #define INC_COUNT(scope,value) \ |
| ++count; |
| #define CHECK_REQ(req_expr) \ |
| if (which < count) return ok; \ |
| ok = (req_expr); |
| EACH_NAMED_CON(INC_COUNT, CHECK_REQ); |
| #undef INC_COUNT |
| #undef CHECK_REQ |
| assert(count == con_value_count, ""); |
| if (which < count) return ok; |
| return false; |
| } |
| |
| #undef ONE_PLUS |
| #undef VALUE_COMMA |
| #undef STRING_NULL |
| #undef EACH_NAMED_CON |
| #endif // PRODUCT |
| |
| JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { |
| #ifndef PRODUCT |
| if (advertise_con_value(which)) { |
| assert(which >= 0 && which < con_value_count, ""); |
| int con = con_values[which]; |
| objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); |
| if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { |
| const char* str = &con_names[0]; |
| for (int i = 0; i < which; i++) |
| str += strlen(str) + 1; // skip name and null |
| oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint |
| box->obj_at_put(0, name); |
| } |
| return con; |
| } |
| #endif |
| return 0; |
| } |
| JVM_END |
| |
| // void init(MemberName self, AccessibleObject ref) |
| JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { |
| if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } |
| if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } |
| Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); |
| Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); |
| MethodHandles::init_MemberName(mname, target); |
| } |
| JVM_END |
| |
| // void expand(MemberName self) |
| JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { |
| if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } |
| Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); |
| MethodHandles::expand_MemberName(mname, 0, CHECK); |
| } |
| JVM_END |
| |
| // void resolve(MemberName self, Class<?> caller) |
| JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { |
| if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } |
| Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); |
| |
| // The trusted Java code that calls this method should already have performed |
| // access checks on behalf of the given caller. But, we can verify this. |
| if (VerifyMethodHandles && caller_jh != NULL && |
| java_lang_invoke_MemberName::clazz(mname()) != NULL) { |
| Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); |
| if (reference_klass != NULL && reference_klass->is_objArray_klass()) { |
| reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); |
| } |
| |
| // Reflection::verify_class_access can only handle instance classes. |
| if (reference_klass != NULL && reference_klass->is_instance_klass()) { |
| // Emulate LinkResolver::check_klass_accessability. |
| Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); |
| if (Reflection::verify_class_access(caller, |
| reference_klass, |
| true) != Reflection::ACCESS_OK) { |
| THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); |
| } |
| } |
| } |
| |
| KlassHandle caller(THREAD, |
| caller_jh == NULL ? (Klass*) NULL : |
| java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); |
| Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); |
| |
| if (resolved.is_null()) { |
| int flags = java_lang_invoke_MemberName::flags(mname()); |
| int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; |
| if (!MethodHandles::ref_kind_is_valid(ref_kind)) { |
| THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); |
| } |
| if ((flags & ALL_KINDS) == IS_FIELD) { |
| THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); |
| } else if ((flags & ALL_KINDS) == IS_METHOD || |
| (flags & ALL_KINDS) == IS_CONSTRUCTOR) { |
| THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); |
| } else { |
| THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); |
| } |
| } |
| |
| return JNIHandles::make_local(THREAD, resolved()); |
| } |
| JVM_END |
| |
| static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { |
| if (mname == NULL || |
| java_lang_invoke_MemberName::vmtarget(mname) == NULL) { |
| THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); |
| } else { |
| int flags = java_lang_invoke_MemberName::flags(mname); |
| if ((flags & IS_FIELD) != 0 && |
| (must_be_static |
| ? (flags & JVM_ACC_STATIC) != 0 |
| : (flags & JVM_ACC_STATIC) == 0)) { |
| int vmindex = java_lang_invoke_MemberName::vmindex(mname); |
| return (jlong) vmindex; |
| } |
| } |
| const char* msg = (must_be_static ? "static field required" : "non-static field required"); |
| THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); |
| return 0; |
| } |
| |
| JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { |
| return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); |
| } |
| JVM_END |
| |
| JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { |
| return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); |
| } |
| JVM_END |
| |
| JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { |
| // use the other function to perform sanity checks: |
| jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); |
| oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); |
| return JNIHandles::make_local(THREAD, clazz); |
| } |
| JVM_END |
| |
| JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { |
| if (mname_jh == NULL) return NULL; |
| Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); |
| intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); |
| Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); |
| objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); |
| jvalue vmindex_value; vmindex_value.j = (long)vmindex; |
| oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); |
| result->obj_at_put(0, x); |
| x = NULL; |
| if (vmtarget == NULL) { |
| x = NULL; |
| } else if (vmtarget->is_klass()) { |
| x = ((Klass*) vmtarget)->java_mirror(); |
| } else if (vmtarget->is_method()) { |
| x = mname(); |
| } |
| result->obj_at_put(1, x); |
| return JNIHandles::make_local(env, result()); |
| } |
| JVM_END |
| |
| |
| |
| // static native int getMembers(Class<?> defc, String matchName, String matchSig, |
| // int matchFlags, Class<?> caller, int skip, MemberName[] results); |
| JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, |
| jclass clazz_jh, jstring name_jh, jstring sig_jh, |
| int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { |
| if (clazz_jh == NULL || results_jh == NULL) return -1; |
| KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); |
| |
| objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); |
| if (results.is_null() || !results->is_objArray()) return -1; |
| |
| TempNewSymbol name = NULL; |
| TempNewSymbol sig = NULL; |
| if (name_jh != NULL) { |
| name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); |
| if (name == NULL) return 0; // a match is not possible |
| } |
| if (sig_jh != NULL) { |
| sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); |
| if (sig == NULL) return 0; // a match is not possible |
| } |
| |
| KlassHandle caller; |
| if (caller_jh != NULL) { |
| oop caller_oop = JNIHandles::resolve_non_null(caller_jh); |
| if (!java_lang_Class::is_instance(caller_oop)) return -1; |
| caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); |
| } |
| |
| if (name != NULL && sig != NULL && results.not_null()) { |
| // try a direct resolve |
| // %%% TO DO |
| } |
| |
| int res = MethodHandles::find_MemberNames(k, name, sig, mflags, |
| caller, skip, results); |
| // TO DO: expand at least some of the MemberNames, to avoid massive callbacks |
| return res; |
| } |
| JVM_END |
| |
| JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { |
| Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); |
| Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); |
| { |
| // Walk all nmethods depending on this call site. |
| MutexLocker mu(Compile_lock, thread); |
| MethodHandles::flush_dependent_nmethods(call_site, target); |
| java_lang_invoke_CallSite::set_target(call_site(), target()); |
| } |
| } |
| JVM_END |
| |
| JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { |
| Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); |
| Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); |
| { |
| // Walk all nmethods depending on this call site. |
| MutexLocker mu(Compile_lock, thread); |
| MethodHandles::flush_dependent_nmethods(call_site, target); |
| java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); |
| } |
| } |
| JVM_END |
| |
| // It is called by a Cleaner object which ensures that dropped CallSites properly |
| // deallocate their dependency information. |
| JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { |
| Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); |
| { |
| // Walk all nmethods depending on this call site. |
| MutexLocker mu1(Compile_lock, thread); |
| |
| int marked = 0; |
| { |
| NoSafepointVerifier nsv; |
| MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
| assert(safe_to_expunge(), "removal is not safe"); |
| DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); |
| marked = deps.remove_all_dependents(); |
| } |
| if (marked > 0) { |
| // At least one nmethod has been marked for deoptimization |
| VM_Deoptimize op; |
| VMThread::execute(&op); |
| } |
| } |
| } |
| JVM_END |
| |
| /** |
| * Throws a java/lang/UnsupportedOperationException unconditionally. |
| * This is required by the specification of MethodHandle.invoke if |
| * invoked directly. |
| */ |
| JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { |
| THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); |
| return NULL; |
| } |
| JVM_END |
| |
| /** |
| * Throws a java/lang/UnsupportedOperationException unconditionally. |
| * This is required by the specification of MethodHandle.invokeExact if |
| * invoked directly. |
| */ |
| JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { |
| THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); |
| return NULL; |
| } |
| JVM_END |
| |
| /// JVM_RegisterMethodHandleMethods |
| |
| #undef CS // Solaris builds complain |
| |
| #define LANG "Ljava/lang/" |
| #define JLINV "Ljava/lang/invoke/" |
| |
| #define OBJ LANG "Object;" |
| #define CLS LANG "Class;" |
| #define STRG LANG "String;" |
| #define CS JLINV "CallSite;" |
| #define MT JLINV "MethodType;" |
| #define MH JLINV "MethodHandle;" |
| #define MEM JLINV "MemberName;" |
| #define CTX JLINV "MethodHandleNatives$CallSiteContext;" |
| |
| #define CC (char*) /*cast a literal from (const char*)*/ |
| #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) |
| |
| // These are the native methods on java.lang.invoke.MethodHandleNatives. |
| static JNINativeMethod MHN_methods[] = { |
| {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, |
| {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, |
| {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, |
| // static native int getNamedCon(int which, Object[] name) |
| {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, |
| // static native int getMembers(Class<?> defc, String matchName, String matchSig, |
| // int matchFlags, Class<?> caller, int skip, MemberName[] results); |
| {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, |
| {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, |
| {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, |
| {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, |
| {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, |
| {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, |
| {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, |
| {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} |
| }; |
| |
| static JNINativeMethod MH_methods[] = { |
| // UnsupportedOperationException throwers |
| {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, |
| {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} |
| }; |
| |
| /** |
| * This one function is exported, used by NativeLookup. |
| */ |
| JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { |
| assert(!MethodHandles::enabled(), "must not be enabled"); |
| assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); |
| |
| oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); |
| jclass MH_class = (jclass) JNIHandles::make_local(env, mirror); |
| |
| { |
| ThreadToNativeFromVM ttnfv(thread); |
| |
| int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); |
| guarantee(status == JNI_OK && !env->ExceptionOccurred(), |
| "register java.lang.invoke.MethodHandleNative natives"); |
| |
| status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); |
| guarantee(status == JNI_OK && !env->ExceptionOccurred(), |
| "register java.lang.invoke.MethodHandle natives"); |
| } |
| |
| if (TraceInvokeDynamic) { |
| tty->print_cr("MethodHandle support loaded (using LambdaForms)"); |
| } |
| |
| MethodHandles::set_enabled(true); |
| } |
| JVM_END |