--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/prims/methodHandles.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,1419 @@
+/*
+ * Copyright (c) 2008, 2017, 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/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 "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) {
+ 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
+};
+
+oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) {
+ // 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()
+ Klass* k = java_lang_Class::as_Klass(clazz);
+ if (k != 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);
+ Klass* k = java_lang_Class::as_Klass(clazz);
+ if (k != 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, CHECK_NULL);
+ 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);
+ Klass* k = java_lang_Class::as_Klass(clazz);
+ if (k != NULL && k->is_instance_klass()) {
+ Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
+ if (m == NULL) return NULL;
+ CallInfo info(m, k, CHECK_NULL);
+ 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");
+ Klass* m_klass = m->method_holder();
+ assert(m_klass != 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.)
+ Klass* 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;
+ }
+
+ Handle resolved_method = info.resolved_method_name();
+ assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(),
+ "Should not change after link resolultion");
+
+ oop mname_oop = mname();
+ java_lang_invoke_MemberName::set_flags (mname_oop, flags);
+ java_lang_invoke_MemberName::set_method (mname_oop, resolved_method());
+ 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.
+ // 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.
+ return mname();
+}
+
+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);
+ 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_method (mname_oop, NULL);
+ 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();
+ default:
+ 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;
+ default:
+ 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;
+ default: break;
+ }
+
+ // 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, Klass* 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);
+ }
+
+ InstanceKlass* defc = NULL;
+ {
+ 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 = InstanceKlass::cast(defc_klass);
+ }
+ if (defc == 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
+
+ LinkInfo::AccessCheck access_check = caller != NULL ?
+ LinkInfo::needs_access_check :
+ LinkInfo::skip_access_check;
+
+ // Time to do the lookup.
+ switch (flags & ALL_KINDS) {
+ case IS_METHOD:
+ {
+ CallInfo result;
+ LinkInfo link_info(defc, name, type, caller, access_check);
+ {
+ 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, Handle(),
+ 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);
+ }
+ result.set_resolved_method_name(CHECK_(empty));
+ oop mname2 = init_method_MemberName(mname, result);
+ return Handle(THREAD, mname2);
+ }
+ case IS_CONSTRUCTOR:
+ {
+ CallInfo result;
+ LinkInfo link_info(defc, name, type, caller, access_check);
+ {
+ assert(!HAS_PENDING_EXCEPTION, "");
+ if (name == vmSymbols::object_initializer_name()) {
+ LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD);
+ } else {
+ break; // will throw after end of switch
+ }
+ if (HAS_PENDING_EXCEPTION) {
+ return empty;
+ }
+ }
+ assert(result.is_statically_bound(), "");
+ result.set_resolved_method_name(CHECK_(empty));
+ 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, LinkInfo::skip_access_check);
+ 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()), "");
+
+ 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:
+ {
+ Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
+ if (vmtarget == NULL) {
+ THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
+ }
+ methodHandle m(THREAD, vmtarget);
+ DEBUG_ONLY(vmtarget = NULL); // safety
+ 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
+ oop 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:
+ {
+ oop clazz = java_lang_invoke_MemberName::clazz(mname());
+ if (clazz == NULL) {
+ THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)");
+ }
+ InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz));
+ DEBUG_ONLY(clazz = NULL); // safety
+ int vmindex = java_lang_invoke_MemberName::vmindex(mname());
+ 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_name) {
+ //not java_lang_String::create_from_symbol; let's intern member names
+ oop 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 (THREAD, field_signature_type_or_null(fd.signature()));
+ if (type.is_null()) {
+ type = 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(Klass* k,
+ Symbol* name, Symbol* sig,
+ int mflags, Klass* caller,
+ int skip, objArrayHandle results, TRAPS) {
+ // %%% take caller into account!
+
+ Thread* thread = Thread::current();
+
+ if (k == 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) {
+ InstanceKlass* ik = InstanceKlass::cast(k);
+ for (FieldStream st(ik, 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
+ }
+ InstanceKlass* ik = InstanceKlass::cast(k);
+ for (MethodStream st(ik, 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, NULL, CHECK_0);
+ 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);
+ }
+}
+
+//
+// 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, CHECK);
+}
+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 (caller != SystemDictionary::Object_klass()
+ && Reflection::verify_class_access(caller,
+ InstanceKlass::cast(reference_klass),
+ true) != Reflection::ACCESS_OK) {
+ THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
+ }
+ }
+ }
+
+ Klass* caller = caller_jh == NULL ? 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::clazz(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());
+ objArrayHandle result = oopFactory::new_objArray_handle(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);
+
+ int flags = java_lang_invoke_MemberName::flags(mname());
+ if ((flags & IS_FIELD) != 0) {
+ x = java_lang_invoke_MemberName::clazz(mname());
+ } else {
+ Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
+ assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only 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;
+ Klass* k = 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
+ }
+
+ Klass* caller = NULL;
+ if (caller_jh != NULL) {
+ oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
+ if (!java_lang_Class::is_instance(caller_oop)) return -1;
+ caller = 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, CHECK_0);
+ // 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