jdk8-mips64-public/hotspot: src/share/vm/prims/methodHandles.cpp@1d7922586cf6 (annotated)

src/share/vm/prims/methodHandles.cpp@1d7922586cf6 (annotated)

src/share/vm/prims/methodHandles.cpp

Tue, 24 Jul 2012 10:51:00 -0700

author: twisti
date: Tue, 24 Jul 2012 10:51:00 -0700
changeset 3969: 1d7922586cf6
parent 3928: 56c4f88474b3
child 3974: 93c71eb28866
permissions: -rw-r--r--

7023639: JSR 292 method handle invocation needs a fast path for compiled code
6984705: JSR 292 method handle creation should not go through JNI
Summary: remove assembly code for JDK 7 chained method handles
Reviewed-by: jrose, twisti, kvn, mhaupt
Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>

 /*
  * Copyright (c) 2008, 2011, 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/symbolTable.hpp"
 #include "compiler/compileBroker.hpp"
 #include "interpreter/interpreter.hpp"
 #include "interpreter/oopMapCache.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/oopFactory.hpp"
 #include "prims/methodHandles.hpp"
 #include "runtime/compilationPolicy.hpp"
 #include "runtime/javaCalls.hpp"
 #include "runtime/reflection.hpp"
 #include "runtime/signature.hpp"
 #include "runtime/stubRoutines.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;
 //------------------------------------------------------------------------------
 // MethodHandles::generate_adapters
 //
 void MethodHandles::generate_adapters() {
   if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL)  return;
   assert(_adapter_code == NULL, "generate only once");
   ResourceMark rm;
   TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
   _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
   if (_adapter_code == NULL)
     vm_exit_out_of_memory(adapter_code_size, "CodeCache: no room for MethodHandles adapters");
   {
     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 && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
     _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,
   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(oop mname_oop, oop target_oop) {
   klassOop 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()
     int mods  = java_lang_reflect_Field::modifiers(target_oop);
     oop type  = java_lang_reflect_Field::type(target_oop);
     oop name  = java_lang_reflect_Field::name(target_oop);
     klassOop k = java_lang_Class::as_klassOop(clazz);
     intptr_t offset = instanceKlass::cast(k)->field_offset(slot);
     return init_field_MemberName(mname_oop, k, accessFlags_from(mods), type, name, offset);
   } 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);
     klassOop k = java_lang_Class::as_klassOop(clazz);
     if (k != NULL && Klass::cast(k)->oop_is_instance()) {
       methodOop m = instanceKlass::cast(k)->method_with_idnum(slot);
       return init_method_MemberName(mname_oop, m, true, k);
     }
   } 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);
     klassOop k = java_lang_Class::as_klassOop(clazz);
     if (k != NULL && Klass::cast(k)->oop_is_instance()) {
       methodOop m = instanceKlass::cast(k)->method_with_idnum(slot);
       return init_method_MemberName(mname_oop, m, false, k);
     }
   } else if (target_klass == SystemDictionary::MemberName_klass()) {
     // Note: This only works if the MemberName has already been resolved.
     oop clazz        = java_lang_invoke_MemberName::clazz(target_oop);
     int flags        = java_lang_invoke_MemberName::flags(target_oop);
     oop vmtarget     = java_lang_invoke_MemberName::vmtarget(target_oop);
     intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop);
     klassOop k       = java_lang_Class::as_klassOop(clazz);
     int ref_kind     = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
     if (vmtarget == NULL)  return NULL;  // not resolved
     if ((flags & IS_FIELD) != 0) {
       assert(vmtarget->is_klass(), "field vmtarget is klassOop");
       int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0);
       // FIXME:  how does k (receiver_limit) contribute?
       return init_field_MemberName(mname_oop, klassOop(vmtarget), accessFlags_from(basic_mods), NULL, NULL, vmindex);
     } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
       assert(vmtarget->is_method(), "method or constructor vmtarget is methodOop");
       return init_method_MemberName(mname_oop, methodOop(vmtarget), ref_kind_does_dispatch(ref_kind), k);
     } else {
       return NULL;
     }
   }
   return NULL;
 }
 oop MethodHandles::init_method_MemberName(oop mname_oop, methodOop m, bool do_dispatch,
                                           klassOop receiver_limit) {
   AccessFlags mods = m->access_flags();
   int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
   int vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
   klassOop mklass = m->method_holder();
   if (receiver_limit == NULL)
     receiver_limit = mklass;
   if (m->is_initializer()) {
     flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
   } else if (mods.is_static()) {
     flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
   } else if (receiver_limit != mklass &&
              !Klass::cast(receiver_limit)->is_subtype_of(mklass)) {
     return NULL;  // bad receiver limit
   } else if (Klass::cast(receiver_limit)->is_interface() &&
              Klass::cast(mklass)->is_interface()) {
     flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
     receiver_limit = mklass;  // ignore passed-in limit; interfaces are interconvertible
     vmindex = klassItable::compute_itable_index(m);
   } else if (mklass != receiver_limit && Klass::cast(mklass)->is_interface()) {
     flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
     // it is a miranda method, so m->vtable_index is not what we want
     ResourceMark rm;
     klassVtable* vt = instanceKlass::cast(receiver_limit)->vtable();
     vmindex = vt->index_of_miranda(m->name(), m->signature());
   } else if (!do_dispatch || m->can_be_statically_bound()) {
     flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
   } else {
     flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
     vmindex = m->vtable_index();
   }
   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,    Klass::cast(receiver_limit)->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 methodOop.
   // 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
   return mname_oop;
 }
 Handle MethodHandles::init_method_MemberName(oop mname_oop, CallInfo& info, TRAPS) {
   Handle empty;
   if (info.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);
   }
   methodHandle m = info.resolved_method();
   KlassHandle defc = info.resolved_klass();
   int vmindex = -1;
   if (defc->is_interface() && Klass::cast(m->method_holder())->is_interface()) {
     // LinkResolver does not report itable indexes!  (fix this?)
     vmindex = klassItable::compute_itable_index(m());
   } else if (m->can_be_statically_bound()) {
     // LinkResolver reports vtable index even for final methods!
     vmindex = methodOopDesc::nonvirtual_vtable_index;
   } else {
     vmindex = info.vtable_index();
   }
   oop res = init_method_MemberName(mname_oop, m(), (vmindex >= 0), defc());
   assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), "");
   return Handle(THREAD, res);
 }
 oop MethodHandles::init_field_MemberName(oop mname_oop, klassOop field_holder,
                                          AccessFlags mods, oop type, oop name,
                                          intptr_t offset, bool is_setter) {
   int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
   flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
   if (is_setter)  flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
   oop vmtarget = field_holder;
   int vmindex  = offset;  // determines the field uniquely when combined with static bit
   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,    Klass::cast(field_holder)->java_mirror());
   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_oop;
 }
 Handle MethodHandles::init_field_MemberName(oop mname_oop, FieldAccessInfo& info, TRAPS) {
   return Handle();
 #if 0
   KlassHandle field_holder = info.klass();
   intptr_t    field_offset = info.field_offset();
   return init_field_MemberName(mname_oop, field_holder(),
                                info.access_flags(),
                                type, name,
                                field_offset, false /*is_setter*/);
 #endif
 }
 // 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 class.
 // * It has a single formal parameter of type Object[].
 // * It has a return type of Object.
 // * It has the ACC_VARARGS and ACC_NATIVE flags set.
 bool MethodHandles::is_method_handle_invoke_name(klassOop 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::cast(klass)->name() != vmSymbols::java_lang_invoke_MethodHandle())
     return false;
   Symbol* poly_sig = vmSymbols::object_array_object_signature();
   methodOop m = instanceKlass::cast(klass)->find_method(name, poly_sig);
   if (m == NULL)  return false;
   int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
   int flags = m->access_flags().as_int();
   return (flags & required) == required;
 }
 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
   assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", 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();
   }
   assert(false, "");
   return 0;
 }
 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;
   }
   assert(false, err_msg("iid=%d", 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.
   klassOop 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;
   // 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(klassOop klass, Symbol* name) {
   if (klass != NULL &&
       Klass::cast(klass)->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
     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, CHECK_NULL);
   } else if (java_lang_Class::is_instance(type_str)) {
     return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
   } else if (java_lang_String::is_instance(type_str)) {
     if (intern_if_not_found) {
       return java_lang_String::as_symbol(type_str, CHECK_NULL);
     } 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(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 Klass::cast(SystemDictionary::Object_klass())->java_mirror();
 }
 static oop field_name_or_null(Symbol* s) {
   if (s == NULL)  return NULL;
   return StringTable::lookup(s);
 }
 static oop 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 Klass::cast(SystemDictionary::Class_klass())->java_mirror();
     } else if (s == vmSymbols::string_signature()) {
       return Klass::cast(SystemDictionary::String_klass())->java_mirror();
     } else {
       int len = s->utf8_length();
       if (s->byte_at(0) == 'L' && s->byte_at(len-1) == ';') {
         TempNewSymbol cname = SymbolTable::probe((const char*)&s->bytes()[1], len-2);
         if (cname == NULL)  return NULL;
         klassOop wkk = SystemDictionary::find_well_known_klass(cname);
         if (wkk == NULL)  return NULL;
         return Klass::cast(wkk)->java_mirror();
       }
     }
   }
   return NULL;
 }
 // An unresolved member name is a mere symbolic reference.
 // Resolving it plants a vmtarget/vmindex in it,
 // which refers dirctly to JVM internals.
 Handle MethodHandles::resolve_MemberName(Handle mname, 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 >= methodOopDesc::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;
   {
     klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop());
     if (defc_klassOop == NULL)  return empty;  // a primitive; no resolution possible
     if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
       if (!Klass::cast(defc_klassOop)->oop_is_array())  return empty;
       defc_klassOop = SystemDictionary::Object_klass();
     }
     defc = instanceKlassHandle(THREAD, defc_klassOop);
   }
   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;
       bool do_dispatch = true;  // default, neutral setting
       {
         assert(!HAS_PENDING_EXCEPTION, "");
         if (ref_kind == JVM_REF_invokeStatic) {
           //do_dispatch = false;  // no need, since statics are never dispatched
           LinkResolver::resolve_static_call(result,
                         defc, name, type, KlassHandle(), false, false, THREAD);
         } else if (ref_kind == JVM_REF_invokeInterface) {
           LinkResolver::resolve_interface_call(result, Handle(), defc,
                         defc, name, type, KlassHandle(), false, false, THREAD);
         } else if (mh_invoke_id != vmIntrinsics::_none) {
           assert(!is_signature_polymorphic_static(mh_invoke_id), "");
           LinkResolver::resolve_handle_call(result,
                         defc, name, type, KlassHandle(), THREAD);
         } else if (ref_kind == JVM_REF_invokeSpecial) {
           do_dispatch = false;  // force non-virtual linkage
           LinkResolver::resolve_special_call(result,
                         defc, name, type, KlassHandle(), false, THREAD);
         } else if (ref_kind == JVM_REF_invokeVirtual) {
           LinkResolver::resolve_virtual_call(result, Handle(), defc,
                         defc, name, type, KlassHandle(), false, false, THREAD);
         } else {
           assert(false, err_msg("ref_kind=%d", ref_kind));
         }
         if (HAS_PENDING_EXCEPTION) {
           return empty;
         }
       }
       return init_method_MemberName(mname(), result, THREAD);
     }
   case IS_CONSTRUCTOR:
     {
       CallInfo result;
       {
         assert(!HAS_PENDING_EXCEPTION, "");
         if (name == vmSymbols::object_initializer_name()) {
           LinkResolver::resolve_special_call(result,
                         defc, name, type, KlassHandle(), false, THREAD);
         } else {
           break;                // will throw after end of switch
         }
         if (HAS_PENDING_EXCEPTION) {
           return empty;
         }
       }
       assert(result.is_statically_bound(), "");
       return init_method_MemberName(mname(), result, THREAD);
     }
   case IS_FIELD:
     {
       // This is taken from LinkResolver::resolve_field, sans access checks.
       fieldDescriptor fd; // find_field initializes fd if found
       KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd));
       // check if field exists; i.e., if a klass containing the field def has been selected
       if (sel_klass.is_null())  return empty;  // should not happen
       oop type = field_signature_type_or_null(fd.signature());
       oop name = field_name_or_null(fd.name());
       bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind));
       mname = Handle(THREAD,
                      init_field_MemberName(mname(), sel_klass->as_klassOop(),
                                            fd.access_flags(), type, name, fd.offset(), is_setter));
       return mname;
     }
   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()), "");
   oop 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 methodOop");
       methodHandle m(THREAD, methodOop(vmtarget));
       DEBUG_ONLY(vmtarget = NULL);  // safety
       if (m.is_null())  break;
       if (!have_defc) {
         klassOop defc = m->method_holder();
         java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(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:
     {
       // This is taken from LinkResolver::resolve_field, sans access checks.
       assert(vmtarget->is_klass(), "field vmtarget is klassOop");
       if (!Klass::cast((klassOop) vmtarget)->oop_is_instance())  break;
       instanceKlassHandle defc(THREAD, (klassOop) 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(klassOop k,
                                     Symbol* name, Symbol* sig,
                                     int mflags, klassOop caller,
                                     int skip, objArrayOop results) {
   DEBUG_ONLY(No_Safepoint_Verifier nsv);
   // this code contains no safepoints!
   // %%% take caller into account!
   if (k == NULL || !Klass::cast(k)->oop_is_instance())  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) {
         oop result = results->obj_at(rfill++);
         if (!java_lang_invoke_MemberName::is_instance(result))
           return -99;  // caller bug!
         oop type = field_signature_type_or_null(st.signature());
         oop name = field_name_or_null(st.name());
         oop saved = MethodHandles::init_field_MemberName(result, st.klass()->as_klassOop(),
                                                          st.access_flags(), type, name,
                                                          st.offset());
         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()) {
       methodOop 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) {
         oop result = results->obj_at(rfill++);
         if (!java_lang_invoke_MemberName::is_instance(result))
           return -99;  // caller bug!
         oop saved = MethodHandles::init_method_MemberName(result, m, true, NULL);
         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;
 }
 //
 // 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.
 //
 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
   switch (which) {
   case MethodHandles::GC_COUNT_GWT:
 #ifdef COMPILER2
     return true;
 #else
     return false;
 #endif
   }
   return 0;
 }
 JVM_END
 #ifndef PRODUCT
 #define EACH_NAMED_CON(template, requirement) \
     template(MethodHandles,GC_COUNT_GWT) \
     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_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) \
     template(MethodHandles,GC_LAMBDA_SUPPORT) \
     /*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));
   oop target_oop = JNIHandles::resolve_non_null(target_jh);
   MethodHandles::init_MemberName(mname(), target_oop);
 }
 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) {
     klassOop reference_klass = java_lang_Class::as_klassOop(java_lang_invoke_MemberName::clazz(mname()));
     if (reference_klass != NULL) {
       // Emulate LinkResolver::check_klass_accessability.
       klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh));
       if (!Reflection::verify_class_access(caller,
                                            reference_klass,
                                            true)) {
         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name());
       }
     }
   }
   Handle resolved = MethodHandles::resolve_MemberName(mname, 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_NoSuchMethodError(), "field resolution failed");
     } else if ((flags & ALL_KINDS) == IS_METHOD ||
                (flags & ALL_KINDS) == IS_CONSTRUCTOR) {
       THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "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());
   Handle   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.is_null() || vmtarget->is_instance()) {
     x = vmtarget();
   } else if (vmtarget->is_klass()) {
     x = Klass::cast((klassOop) vmtarget())->java_mirror();
   } else {
     Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL);
     if (vmtarget->is_method())
       x = MethodHandles::init_method_MemberName(mname2(), methodOop(vmtarget()), false, NULL);
     else
       x = MethodHandles::init_MemberName(mname2(), vmtarget());
   }
   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_klassOop(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_klassOop(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(target_jh));
   {
     // Walk all nmethods depending on this call site.
     MutexLocker mu(Compile_lock, thread);
     Universe::flush_dependents_on(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(target_jh));
   {
     // Walk all nmethods depending on this call site.
     MutexLocker mu(Compile_lock, thread);
     Universe::flush_dependents_on(call_site, target);
   }
   java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
 }
 JVM_END
 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
     TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
     THROW_MSG_NULL(UOE_name, "MethodHandle.invoke cannot be invoked reflectively");
     return NULL;
 }
 JVM_END
 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv *env, jobject igmh, jobjectArray igargs)) {
     TempNewSymbol UOE_name = SymbolTable::new_symbol("java/lang/UnsupportedOperationException", CHECK_NULL);
     THROW_MSG_NULL(UOE_name, "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 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 required_methods_JDK8[] = {
   {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)},
   {CC"getConstant",               CC"(I)I",                              FN_PTR(MHN_getConstant)},
   //  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"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 invoke_methods[] = {
   {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)) {
   if (!EnableInvokeDynamic) {
     warning("JSR 292 is disabled in this JVM.  Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
     return;  // bind nothing
   }
   assert(!MethodHandles::enabled(), "must not be enabled");
   bool enable_MH = true;
   jclass MH_class = NULL;
   if (SystemDictionary::MethodHandle_klass() == NULL) {
     enable_MH = false;
   } else {
     oop mirror = Klass::cast(SystemDictionary::MethodHandle_klass())->java_mirror();
     MH_class = (jclass) JNIHandles::make_local(env, mirror);
   }
   int status;
   if (enable_MH) {
     ThreadToNativeFromVM ttnfv(thread);
     status = env->RegisterNatives(MHN_class, required_methods_JDK8, sizeof(required_methods_JDK8)/sizeof(JNINativeMethod));
     if (status == JNI_OK && !env->ExceptionOccurred()) {
       status = env->RegisterNatives(MH_class, invoke_methods, sizeof(invoke_methods)/sizeof(JNINativeMethod));
     }
     if (status != JNI_OK || env->ExceptionOccurred()) {
       warning("JSR 292 method handle code is mismatched to this JVM.  Disabling support.");
       enable_MH = false;
       env->ExceptionClear();
     }
   }
   if (TraceInvokeDynamic) {
     tty->print_cr("MethodHandle support loaded (using LambdaForms)");
   }
   if (enable_MH) {
     MethodHandles::generate_adapters();
     MethodHandles::set_enabled(true);
   }
 }
 JVM_END

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/methodHandles.cpp@1d7922586cf6 (annotated)

src/share/vm/prims/methodHandles.cpp