/*

 * Copyright (c) 1997, 2018, 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

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 */

#ifndef SHARE_VM_UTILITIES_CONSTANTTAG_HPP

#define SHARE_VM_UTILITIES_CONSTANTTAG_HPP

#include "jvm.h"

// constant tags in Java .class files

enum {

  // See jvm.h for shared JVM_CONSTANT_XXX tags

  // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java

  // Hotspot specific tags

  JVM_CONSTANT_Invalid                  = 0,    // For bad value initialization

  JVM_CONSTANT_InternalMin              = 100,  // First implementation tag (aside from bad value of course)

  JVM_CONSTANT_UnresolvedClass          = 100,  // Temporary tag until actual use

  JVM_CONSTANT_ClassIndex               = 101,  // Temporary tag while constructing constant pool

  JVM_CONSTANT_StringIndex              = 102,  // Temporary tag while constructing constant pool

  JVM_CONSTANT_UnresolvedClassInError   = 103,  // Error tag due to resolution error

  JVM_CONSTANT_MethodHandleInError      = 104,  // Error tag due to resolution error

  JVM_CONSTANT_MethodTypeInError        = 105,  // Error tag due to resolution error

  JVM_CONSTANT_DynamicInError           = 106,  // Error tag due to resolution error

  JVM_CONSTANT_InternalMax              = 106   // Last implementation tag

};

class constantTag {

 private:

  jbyte _tag;

 public:

  bool is_klass() const             { return _tag == JVM_CONSTANT_Class; }

  bool is_field () const            { return _tag == JVM_CONSTANT_Fieldref; }

  bool is_method() const            { return _tag == JVM_CONSTANT_Methodref; }

  bool is_interface_method() const  { return _tag == JVM_CONSTANT_InterfaceMethodref; }

  bool is_string() const            { return _tag == JVM_CONSTANT_String; }

  bool is_int() const               { return _tag == JVM_CONSTANT_Integer; }

  bool is_float() const             { return _tag == JVM_CONSTANT_Float; }

  bool is_long() const              { return _tag == JVM_CONSTANT_Long; }

  bool is_double() const            { return _tag == JVM_CONSTANT_Double; }

  bool is_name_and_type() const     { return _tag == JVM_CONSTANT_NameAndType; }

  bool is_utf8() const              { return _tag == JVM_CONSTANT_Utf8; }

  bool is_invalid() const           { return _tag == JVM_CONSTANT_Invalid; }

  bool is_unresolved_klass() const {

    return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError;

  }

  bool is_unresolved_klass_in_error() const {

    return _tag == JVM_CONSTANT_UnresolvedClassInError;

  }

  bool is_method_handle_in_error() const {

    return _tag == JVM_CONSTANT_MethodHandleInError;

  }

  bool is_method_type_in_error() const {

    return _tag == JVM_CONSTANT_MethodTypeInError;

  }

  bool is_dynamic_constant_in_error() const {

    return _tag == JVM_CONSTANT_DynamicInError;

  }

  bool is_klass_index() const       { return _tag == JVM_CONSTANT_ClassIndex; }

  bool is_string_index() const      { return _tag == JVM_CONSTANT_StringIndex; }

  bool is_klass_reference() const   { return is_klass_index() || is_unresolved_klass(); }

  bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); }

  bool is_field_or_method() const   { return is_field() || is_method() || is_interface_method(); }

  bool is_symbol() const            { return is_utf8(); }

  bool is_method_type() const       { return _tag == JVM_CONSTANT_MethodType; }

  bool is_method_handle() const     { return _tag == JVM_CONSTANT_MethodHandle; }

  bool is_dynamic_constant() const  { return _tag == JVM_CONSTANT_Dynamic; }

  bool is_invoke_dynamic() const    { return _tag == JVM_CONSTANT_InvokeDynamic; }

  bool is_loadable_constant() const {

    return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) ||

            is_method_type() || is_method_handle() || is_dynamic_constant() ||

            is_unresolved_klass());

  }

  constantTag() {

    _tag = JVM_CONSTANT_Invalid;

  }

  constantTag(jbyte tag) {

    assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||

           (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) ||

           (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");

    _tag = tag;

  }

  static constantTag ofBasicType(BasicType bt) {

    if (is_subword_type(bt))  bt = T_INT;

    switch (bt) {

      case T_OBJECT: return constantTag(JVM_CONSTANT_String);

      case T_INT:    return constantTag(JVM_CONSTANT_Integer);

      case T_LONG:   return constantTag(JVM_CONSTANT_Long);

      case T_FLOAT:  return constantTag(JVM_CONSTANT_Float);

      case T_DOUBLE: return constantTag(JVM_CONSTANT_Double);

      default:       break;

    }

    assert(false, "bad basic type for tag");

    return constantTag();

  }

  jbyte value() const                { return _tag; }

  jbyte error_value() const;

  jbyte non_error_value() const;

  BasicType basic_type() const;        // if used with ldc, what kind of value gets pushed?

  const char* internal_name() const;  // for error reporting

  void print_on(outputStream* st) const PRODUCT_RETURN;

};

#endif // SHARE_VM_UTILITIES_CONSTANTTAG_HPP