/*

   +----------------------------------------------------------------------+

   | Zend Engine                                                          |

   +----------------------------------------------------------------------+

   | Copyright © Zend Technologies Ltd., a subsidiary company of          |

   |     Perforce Software, Inc., and Contributors.                       |

   +----------------------------------------------------------------------+

   | This source file is subject to the Modified BSD License that is      |

   | bundled with this package in the file LICENSE, and is available      |

   | through the World Wide Web at <https://www.php.net/license/>.        |

   |                                                                      |

   | SPDX-License-Identifier: BSD-3-Clause                                |

   +----------------------------------------------------------------------+

   | Authors: Andi Gutmans <andi@php.net>                                 |

   |          Zeev Suraski <zeev@php.net>                                 |

   |          Dmitry Stogov <dmitry@php.net>                              |

   +----------------------------------------------------------------------+

*/

#include <stdio.h>

#include "zend.h"

#include "zend_API.h"

#include "zend_ast.h"

#include "zend_globals.h"

#include "zend_constants.h"

#include "zend_list.h"

#if ZEND_DEBUG

static void ZEND_FASTCALL zend_string_destroy(zend_string *str);

#else

# define zend_string_destroy _efree

#endif

static void ZEND_FASTCALL zend_reference_destroy(zend_reference *ref);

static void ZEND_FASTCALL zend_empty_destroy(zend_reference *ref);

typedef void (ZEND_FASTCALL *zend_rc_dtor_func_t)(zend_refcounted *p);

static const zend_rc_dtor_func_t zend_rc_dtor_func[] = {

  [IS_UNDEF] =        (zend_rc_dtor_func_t)zend_empty_destroy,

  [IS_NULL] =         (zend_rc_dtor_func_t)zend_empty_destroy,

  [IS_FALSE] =        (zend_rc_dtor_func_t)zend_empty_destroy,

  [IS_TRUE] =         (zend_rc_dtor_func_t)zend_empty_destroy,

  [IS_LONG] =         (zend_rc_dtor_func_t)zend_empty_destroy,

  [IS_DOUBLE] =       (zend_rc_dtor_func_t)zend_empty_destroy,

  [IS_STRING] =       (zend_rc_dtor_func_t)zend_string_destroy,

  [IS_ARRAY] =        (zend_rc_dtor_func_t)zend_array_destroy,

  [IS_OBJECT] =       (zend_rc_dtor_func_t)zend_objects_store_del,

  [IS_RESOURCE] =     (zend_rc_dtor_func_t)zend_list_free,

  [IS_REFERENCE] =    (zend_rc_dtor_func_t)zend_reference_destroy,

  [IS_CONSTANT_AST] = (zend_rc_dtor_func_t)zend_ast_ref_destroy

};

ZEND_API void ZEND_FASTCALL rc_dtor_func(zend_refcounted *p)

{

  ZEND_ASSERT(GC_TYPE(p) <= IS_CONSTANT_AST);

  zend_rc_dtor_func[GC_TYPE(p)](p);

}

#if ZEND_DEBUG

static void ZEND_FASTCALL zend_string_destroy(zend_string *str)

{

  CHECK_ZVAL_STRING(str);

  ZEND_ASSERT(!ZSTR_IS_INTERNED(str));

  ZEND_ASSERT(GC_REFCOUNT(str) == 0);

  ZEND_ASSERT(!(GC_FLAGS(str) & IS_STR_PERSISTENT));

  efree(str);

}

#endif

static void ZEND_FASTCALL zend_reference_destroy(zend_reference *ref)

{

  ZEND_ASSERT(!ZEND_REF_HAS_TYPE_SOURCES(ref));

  i_zval_ptr_dtor(&ref->val);

  efree_size(ref, sizeof(zend_reference));

}

static void ZEND_FASTCALL zend_empty_destroy(zend_reference *ref)

{

}

ZEND_API void zval_ptr_dtor(zval *zval_ptr) /* {{{ */

{

  i_zval_ptr_dtor(zval_ptr);

}

/* }}} */

ZEND_API void zval_ptr_safe_dtor(zval *zval_ptr)

{

  if (Z_REFCOUNTED_P(zval_ptr)) {

    zend_refcounted *ref = Z_COUNTED_P(zval_ptr);

    if (GC_DELREF(ref) == 0) {

      ZVAL_NULL(zval_ptr);

      rc_dtor_func(ref);

    } else {

      gc_check_possible_root(ref);

    }

  }

}

ZEND_API void zval_internal_ptr_dtor(zval *zval_ptr) /* {{{ */

{

  if (Z_REFCOUNTED_P(zval_ptr)) {

    zend_refcounted *ref = Z_COUNTED_P(zval_ptr);

    if (GC_DELREF(ref) == 0) {

      if (Z_TYPE_P(zval_ptr) == IS_STRING) {

        zend_string *str = (zend_string*)ref;

        CHECK_ZVAL_STRING(str);

        ZEND_ASSERT(!ZSTR_IS_INTERNED(str));

        ZEND_ASSERT((GC_FLAGS(str) & IS_STR_PERSISTENT));

        free(str);

      } else {

        zend_error_noreturn(E_CORE_ERROR, "Internal zval's can't be arrays, objects, resources or reference");

      }

    }

  }

}

/* }}} */

/* This function should only be used as a copy constructor, i.e. it

 * should only be called AFTER a zval has been copied to another

 * location using ZVAL_COPY_VALUE. Do not call it before copying,

 * otherwise a reference may be leaked. */

ZEND_API void zval_add_ref(zval *p)

{

  if (Z_REFCOUNTED_P(p)) {

    if (Z_ISREF_P(p) && Z_REFCOUNT_P(p) == 1) {

      ZVAL_COPY(p, Z_REFVAL_P(p));

    } else {

      Z_ADDREF_P(p);

    }

  }

}

ZEND_API void ZEND_FASTCALL zval_copy_ctor_func(zval *zvalue)

{

  if (EXPECTED(Z_TYPE_P(zvalue) == IS_ARRAY)) {

    ZVAL_ARR(zvalue, zend_array_dup(Z_ARRVAL_P(zvalue)));

  } else if (EXPECTED(Z_TYPE_P(zvalue) == IS_STRING)) {

    ZEND_ASSERT(!ZSTR_IS_INTERNED(Z_STR_P(zvalue)));

    CHECK_ZVAL_STRING(Z_STR_P(zvalue));

    ZVAL_NEW_STR(zvalue, zend_string_dup(Z_STR_P(zvalue), 0));

  } else {

    ZEND_UNREACHABLE();

  }

}