view src/share/vm/prims/methodHandles.hpp @ 3602:da91efe96a93

6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <>, stefank <>, mgerdin <>, never <>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 1d7922586cf6
children 65d07d9ee446
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 * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
 * 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 if you need additional information or have any
 * questions.


#include "classfile/javaClasses.hpp"
#include "classfile/vmSymbols.hpp"
#include "runtime/frame.inline.hpp"
#include "runtime/globals.hpp"
#include "runtime/interfaceSupport.hpp"

class MacroAssembler;
class Label;

class MethodHandles: AllStatic {
  // JVM support for MethodHandle, MethodType, and related types
  // in java.lang.invoke and sun.invoke.
  // See also  javaClasses for layouts java_lang_invoke_Method{Handle,Type,Type::Form}.
  static bool enabled()                         { return _enabled; }
  static void set_enabled(bool z);

  static bool _enabled;

  // Adapters.
  static MethodHandlesAdapterBlob* _adapter_code;

  // working with member names
  static Handle resolve_MemberName(Handle mname, TRAPS); // compute vmtarget/vmindex from name/type
  static void expand_MemberName(Handle mname, int suppress, TRAPS);  // expand defc/name/type if missing
  static Handle new_MemberName(TRAPS);  // must be followed by init_MemberName
  static oop init_MemberName(oop mname_oop, oop target_oop); // compute vmtarget/vmindex from target
  static oop init_method_MemberName(oop mname_oop, Method* m, bool do_dispatch,
                                    Klass* receiver_limit);
  static oop init_field_MemberName(oop mname_oop, Klass* field_holder,
                                   AccessFlags mods, oop type, oop name,
                                   intptr_t offset, bool is_setter = false);
  static Handle init_method_MemberName(oop mname_oop, CallInfo& info, TRAPS);
  static Handle init_field_MemberName(oop mname_oop, FieldAccessInfo& info, TRAPS);
  static int method_ref_kind(Method* m, bool do_dispatch_if_possible = true);
  static int find_MemberNames(Klass* k, Symbol* name, Symbol* sig,
                              int mflags, Klass* caller,
                              int skip, objArrayOop results);
  // bit values for suppress argument to expand_MemberName:
  enum { _suppress_defc = 1, _suppress_name = 2, _suppress_type = 4 };

  // Generate MethodHandles adapters.
  static void generate_adapters();

  // Called from MethodHandlesAdapterGenerator.
  static address generate_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid);
  static void generate_method_handle_dispatch(MacroAssembler* _masm,
                                              vmIntrinsics::ID iid,
                                              Register receiver_reg,
                                              Register member_reg,
                                              bool for_compiler_entry);

  // Queries
  static bool is_signature_polymorphic(vmIntrinsics::ID iid) {
    return (iid >= vmIntrinsics::FIRST_MH_SIG_POLY &&
            iid <= vmIntrinsics::LAST_MH_SIG_POLY);

  static bool is_signature_polymorphic_intrinsic(vmIntrinsics::ID iid) {
    assert(is_signature_polymorphic(iid), "");
    // Most sig-poly methods are intrinsics which do not require an
    // appeal to Java for adapter code.
    return (iid != vmIntrinsics::_invokeGeneric);

  static bool is_signature_polymorphic_static(vmIntrinsics::ID iid) {
    assert(is_signature_polymorphic(iid), "");
    return (iid >= vmIntrinsics::FIRST_MH_STATIC &&
            iid <= vmIntrinsics::LAST_MH_SIG_POLY);

  static bool has_member_arg(vmIntrinsics::ID iid) {
    assert(is_signature_polymorphic(iid), "");
    return (iid >= vmIntrinsics::_linkToVirtual &&
            iid <= vmIntrinsics::_linkToInterface);
  static bool has_member_arg(Symbol* klass, Symbol* name) {
    if ((klass == vmSymbols::java_lang_invoke_MethodHandle()) &&
        is_signature_polymorphic_name(name)) {
      vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
      return has_member_arg(iid);
    return false;

  static Symbol* signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid);
  static int signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid);

  static vmIntrinsics::ID signature_polymorphic_name_id(Klass* klass, Symbol* name);
  static vmIntrinsics::ID signature_polymorphic_name_id(Symbol* name);
  static bool is_signature_polymorphic_name(Symbol* name) {
    return signature_polymorphic_name_id(name) != vmIntrinsics::_none;
  static bool is_method_handle_invoke_name(Klass* klass, Symbol* name);
  static bool is_signature_polymorphic_name(Klass* klass, Symbol* name) {
    return signature_polymorphic_name_id(klass, name) != vmIntrinsics::_none;

  enum {
    // format of query to getConstant:
    GC_COUNT_GWT = 4,
  static int get_named_constant(int which, Handle name_box, TRAPS);

  static Symbol* lookup_signature(oop type_str, bool polymorphic, TRAPS);  // use TempNewSymbol
  static Symbol* lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS);  // use TempNewSymbol
  static Symbol* lookup_basic_type_signature(Symbol* sig, TRAPS) {
    return lookup_basic_type_signature(sig, false, THREAD);
  static bool is_basic_type_signature(Symbol* sig);

  static Symbol* lookup_method_type(Symbol* msig, Handle mtype, TRAPS);

  static void print_as_method_type_on(outputStream* st, Symbol* sig) {
    print_as_basic_type_signature_on(st, sig, true, true);
  static void print_as_basic_type_signature_on(outputStream* st, Symbol* sig, bool keep_arrays = false, bool keep_basic_names = false);

  // decoding CONSTANT_MethodHandle constants
  enum { JVM_REF_MIN = JVM_REF_getField, JVM_REF_MAX = JVM_REF_invokeInterface };
  static bool ref_kind_is_valid(int ref_kind) {
    return (ref_kind >= JVM_REF_MIN && ref_kind <= JVM_REF_MAX);
  static bool ref_kind_is_field(int ref_kind) {
    assert(ref_kind_is_valid(ref_kind), "");
    return (ref_kind <= JVM_REF_putStatic);
  static bool ref_kind_is_getter(int ref_kind) {
    assert(ref_kind_is_valid(ref_kind), "");
    return (ref_kind <= JVM_REF_getStatic);
  static bool ref_kind_is_setter(int ref_kind) {
    return ref_kind_is_field(ref_kind) && !ref_kind_is_getter(ref_kind);
  static bool ref_kind_is_method(int ref_kind) {
    return !ref_kind_is_field(ref_kind) && (ref_kind != JVM_REF_newInvokeSpecial);
  static bool ref_kind_has_receiver(int ref_kind) {
    assert(ref_kind_is_valid(ref_kind), "");
    return (ref_kind & 1) != 0;
  static bool ref_kind_is_static(int ref_kind) {
    return !ref_kind_has_receiver(ref_kind) && (ref_kind != JVM_REF_newInvokeSpecial);
  static bool ref_kind_does_dispatch(int ref_kind) {
    return (ref_kind == JVM_REF_invokeVirtual ||
            ref_kind == JVM_REF_invokeInterface);

#ifdef TARGET_ARCH_x86
# include "methodHandles_x86.hpp"
#ifdef TARGET_ARCH_sparc
# include "methodHandles_sparc.hpp"
#ifdef TARGET_ARCH_zero
# include "methodHandles_zero.hpp"
#ifdef TARGET_ARCH_arm
# include "methodHandles_arm.hpp"
#ifdef TARGET_ARCH_ppc
# include "methodHandles_ppc.hpp"


// MethodHandlesAdapterGenerator
class MethodHandlesAdapterGenerator : public StubCodeGenerator {
  MethodHandlesAdapterGenerator(CodeBuffer* code) : StubCodeGenerator(code, PrintMethodHandleStubs) {}

  void generate();