/*

 * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_PRIMS_METHODHANDLES_HPP

#define SHARE_VM_PRIMS_METHODHANDLES_HPP

#include "classfile/javaClasses.hpp"

#include "classfile/vmSymbols.hpp"

#include "runtime/frame.inline.hpp"

#include "runtime/globals.hpp"

#include "runtime/interfaceSupport.hpp"

# include "entry_zero.hpp"

#endif

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}.

 public:

 public:

  static bool enabled()                         { return _enabled; }

  static void set_enabled(bool z);

 private:

  static bool _enabled;

  // Adapters.

  static MethodHandlesAdapterBlob* _adapter_code;

  // utility functions for reifying names and types

  static oop field_name_or_null(Symbol* s);

  static oop field_signature_type_or_null(Symbol* s);

 public:

  // working with member names

  static Handle resolve_MemberName(Handle mname, KlassHandle caller, 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(Handle mname_h, Handle target_h); // compute vmtarget/vmindex from target

  static oop init_field_MemberName(Handle mname_h, fieldDescriptor& fd, bool is_setter = false);

  static oop init_method_MemberName(Handle mname_h, CallInfo& info, bool intern = true);

  static int method_ref_kind(Method* m, bool do_dispatch_if_possible = true);

  static int find_MemberNames(KlassHandle k, Symbol* name, Symbol* sig,

                              int mflags, KlassHandle caller,

                              int skip, objArrayHandle results);

  // bit values for suppress argument to expand_MemberName:

  enum { _suppress_defc = 1, _suppress_name = 2, _suppress_type = 4 };

  // CallSite support

  static void add_dependent_nmethod(oop call_site, nmethod* nm);

  static void remove_dependent_nmethod(oop call_site, nmethod* nm);

  static void flush_dependent_nmethods(Handle call_site, Handle target);

  // 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_method(Method* m) {

    return is_signature_polymorphic(m->intrinsic_id());

  }

  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() ||

         klass == vmSymbols::java_lang_invoke_VarHandle()) &&

        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;

  }

  static Bytecodes::Code signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id);

  static int get_named_constant(int which, Handle name_box, TRAPS);

public:

  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);

  }

  // Tracing

  static void trace_method_handle(MacroAssembler* _masm, const char* adaptername) PRODUCT_RETURN;

  static void trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) {

    if (TraceMethodHandles) {

      const char* name = vmIntrinsics::name_at(iid);

      if (*name == '_')  name += 1;

      const size_t len = strlen(name) + 50;

      char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);

      const char* suffix = "";

      if (is_signature_polymorphic(iid)) {

        if (is_signature_polymorphic_static(iid))

          suffix = "/static";

        else

          suffix = "/private";

      }

      jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);

      trace_method_handle(_masm, qname);

      // Note:  Don't free the allocated char array because it's used

      // during runtime.

    }

  }

};

//------------------------------------------------------------------------------

// MethodHandlesAdapterGenerator

//

class MethodHandlesAdapterGenerator : public StubCodeGenerator {

public:

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

  void generate();

};

//------------------------------------------------------------------------------

// MemberNameTable

//

class MemberNameTable : public GrowableArray<jweak> {

 public:

  MemberNameTable(int methods_cnt);

  ~MemberNameTable();

  oop add_member_name(jweak mem_name_ref);

  oop find_or_add_member_name(jweak mem_name_ref);

#if INCLUDE_JVMTI

  // RedefineClasses() API support:

  // If a MemberName refers to old_method then update it to refer to new_method.

  void adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed);

#endif // INCLUDE_JVMTI

};

#endif // SHARE_VM_PRIMS_METHODHANDLES_HPP