/*

 * Copyright (c) 1997, 2019, 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_RUNTIME_FLAGS_JVMFLAG_HPP

#define SHARE_RUNTIME_FLAGS_JVMFLAG_HPP

#include "utilities/globalDefinitions.hpp"

#include "utilities/macros.hpp"

class outputStream;

// function type that will construct default range string

typedef const char* (*RangeStrFunc)(void);

struct JVMFlag {

  enum Flags {

    // latest value origin

    DEFAULT          = 0,

    COMMAND_LINE     = 1,

    ENVIRON_VAR      = 2,

    CONFIG_FILE      = 3,

    MANAGEMENT       = 4,

    ERGONOMIC        = 5,

    ATTACH_ON_DEMAND = 6,

    INTERNAL         = 7,

    VALUE_ORIGIN_BITS = 4,

    VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),

    // flag kind

    KIND_PRODUCT            = 1 << 4,

    KIND_MANAGEABLE         = 1 << 5,

    KIND_DIAGNOSTIC         = 1 << 6,

    KIND_EXPERIMENTAL       = 1 << 7,

    KIND_NOT_PRODUCT        = 1 << 8,

    KIND_DEVELOP            = 1 << 9,

    KIND_PLATFORM_DEPENDENT = 1 << 10,

    KIND_READ_WRITE         = 1 << 11,

    KIND_C1                 = 1 << 12,

    KIND_C2                 = 1 << 13,

    KIND_ARCH               = 1 << 14,

    KIND_LP64_PRODUCT       = 1 << 15,

    KIND_JVMCI              = 1 << 16,

    // set this bit if the flag was set on the command line

    ORIG_COMMAND_LINE       = 1 << 17,

    KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE)

  };

  enum Error {

    // no error

    SUCCESS = 0,

    // flag name is missing

    MISSING_NAME,

    // flag value is missing

    MISSING_VALUE,

    // error parsing the textual form of the value

    WRONG_FORMAT,

    // flag is not writable

    NON_WRITABLE,

    // flag value is outside of its bounds

    OUT_OF_BOUNDS,

    // flag value violates its constraint

    VIOLATES_CONSTRAINT,

    // there is no flag with the given name

    INVALID_FLAG,

    // the flag can only be set only on command line during invocation of the VM

    COMMAND_LINE_ONLY,

    // the flag may only be set once

    SET_ONLY_ONCE,

    // the flag is not writable in this combination of product/debug build

    CONSTANT,

    // other, unspecified error related to setting the flag

    ERR_OTHER

  };

  enum MsgType {

    NONE = 0,

    DIAGNOSTIC_FLAG_BUT_LOCKED,

    EXPERIMENTAL_FLAG_BUT_LOCKED,

    DEVELOPER_FLAG_BUT_PRODUCT_BUILD,

    NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD

  };

  const char* _type;

  const char* _name;

  void* _addr;

  NOT_PRODUCT(const char* _doc;)

  Flags _flags;

  size_t _name_len;

  // points to all Flags static array

  static JVMFlag* flags;

  // number of flags

  static size_t numFlags;

private:

  static JVMFlag* find_flag(const char* name, size_t length, bool allow_locked, bool return_flag);

public:

  static JVMFlag* find_flag(const char* name) {

    return find_flag(name, strlen(name), false, false);

  }

  static const JVMFlag* find_declared_flag(const char* name, size_t length) {

    return find_flag(name, length, true, true);

  }

  static const JVMFlag* find_declared_flag(const char* name) {

    return find_declared_flag(name, strlen(name));

  }

  static JVMFlag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);

  static const char* get_int_default_range_str();

  static const char* get_uint_default_range_str();

  static const char* get_intx_default_range_str();

  static const char* get_uintx_default_range_str();

  static const char* get_uint64_t_default_range_str();

  static const char* get_size_t_default_range_str();

  static const char* get_double_default_range_str();

  JVMFlag::Error check_writable(bool changed);

  bool is_bool() const;

  bool get_bool() const;

  JVMFlag::Error set_bool(bool value);

  bool is_int() const;

  int get_int() const;

  JVMFlag::Error set_int(int value);

  bool is_uint() const;

  uint get_uint() const;

  JVMFlag::Error set_uint(uint value);

  bool is_intx() const;

  intx get_intx() const;

  JVMFlag::Error set_intx(intx value);

  bool is_uintx() const;

  uintx get_uintx() const;

  JVMFlag::Error set_uintx(uintx value);

  bool is_uint64_t() const;

  uint64_t get_uint64_t() const;

  JVMFlag::Error set_uint64_t(uint64_t value);

  bool is_size_t() const;

  size_t get_size_t() const;

  JVMFlag::Error set_size_t(size_t value);

  bool is_double() const;

  double get_double() const;

  JVMFlag::Error set_double(double value);

  bool is_ccstr() const;

  bool ccstr_accumulates() const;

  ccstr get_ccstr() const;

  JVMFlag::Error set_ccstr(ccstr value);

  Flags get_origin();

  void set_origin(Flags origin);

  size_t get_name_length();

  bool is_default();

  bool is_ergonomic();

  bool is_command_line();

  void set_command_line();

  bool is_product() const;

  bool is_manageable() const;

  bool is_diagnostic() const;

  bool is_experimental() const;

  bool is_notproduct() const;

  bool is_develop() const;

  bool is_read_write() const;

  bool is_constant_in_binary() const;

  bool is_unlocker() const;

  bool is_unlocked() const;

  bool is_writeable() const;

  bool is_external() const;

  void clear_diagnostic();

  void clear_experimental();

  void set_product();

  JVMFlag::MsgType get_locked_message(char*, int) const;

  JVMFlag::MsgType get_locked_message_ext(char*, int) const;

  // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges

  void print_on(outputStream* st, bool withComments = false, bool printRanges = false);

  void print_kind(outputStream* st, unsigned int width);

  void print_origin(outputStream* st, unsigned int width);

  void print_as_flag(outputStream* st);

  static const char* flag_error_str(JVMFlag::Error error);

public:

  static JVMFlag::Error boolAt(const JVMFlag* flag, bool* value);

  static JVMFlag::Error boolAtPut(JVMFlag* flag, bool* value, JVMFlag::Flags origin);

  static JVMFlag::Error intAt(const JVMFlag* flag, int* value);

  static JVMFlag::Error intAtPut(JVMFlag* flag, int* value, JVMFlag::Flags origin);

  static JVMFlag::Error uintAt(const JVMFlag* flag, uint* value);

  static JVMFlag::Error uintAtPut(JVMFlag* flag, uint* value, JVMFlag::Flags origin);

  static JVMFlag::Error intxAt(const JVMFlag* flag, intx* value);

  static JVMFlag::Error intxAtPut(JVMFlag* flag, intx* value, JVMFlag::Flags origin);

  static JVMFlag::Error uintxAt(const JVMFlag* flag, uintx* value);

  static JVMFlag::Error uintxAtPut(JVMFlag* flag, uintx* value, JVMFlag::Flags origin);

  static JVMFlag::Error size_tAt(const JVMFlag* flag, size_t* value);

  static JVMFlag::Error size_tAtPut(JVMFlag* flag, size_t* value, JVMFlag::Flags origin);

  static JVMFlag::Error uint64_tAt(const JVMFlag* flag, uint64_t* value);

  static JVMFlag::Error uint64_tAtPut(JVMFlag* flag, uint64_t* value, JVMFlag::Flags origin);

  static JVMFlag::Error doubleAt(const JVMFlag* flag, double* value);

  static JVMFlag::Error doubleAtPut(JVMFlag* flag, double* value, JVMFlag::Flags origin);

  static JVMFlag::Error ccstrAt(const JVMFlag* flag, ccstr* value);

  // Contract:  JVMFlag will make private copy of the incoming value.

  // Outgoing value is always malloc-ed, and caller MUST call free.

  static JVMFlag::Error ccstrAtPut(JVMFlag* flag, ccstr* value, JVMFlag::Flags origin);

  static void printSetFlags(outputStream* out);

  // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges

  static void printFlags(outputStream* out, bool withComments, bool printRanges = false, bool skipDefaults = false);

  static void printError(bool verbose, const char* msg, ...) ATTRIBUTE_PRINTF(2, 3);

  static void verify() PRODUCT_RETURN;

};

#endif // SHARE_RUNTIME_FLAGS_JVMFLAG_HPP