text: /*
     +----------------------------------------------------------------------+
     | Zend Engine                                                          |
     +----------------------------------------------------------------------+
     | Copyright (c) 1998-2015 Zend Technologies Ltd. (http://www.zend.com) |
     +----------------------------------------------------------------------+
     | This source file is subject to version 2.00 of the Zend license,     |
     | that is bundled with this package in the file LICENSE, and is        |
     | available through the world-wide-web at the following url:           |
     | http://www.zend.com/license/2_00.txt.                                |
     | If you did not receive a copy of the Zend license and are unable to  |
     | obtain it through the world-wide-web, please send a note to          |
     | license@zend.com so we can mail you a copy immediately.              |
     +----------------------------------------------------------------------+
     | Authors: Andi Gutmans <andi@zend.com>                                |
     |          Zeev Suraski <zeev@zend.com>                                |
     +----------------------------------------------------------------------+
  */
  
  /* $Id$ */
  
  #include "zend.h"
  #include "zend_constants.h"
  #include "zend_execute.h"
  #include "zend_variables.h"
  #include "zend_operators.h"
  #include "zend_globals.h"
  #include "zend_API.h"
  
  void free_zend_constant(zval *zv)
  {
  	zend_constant *c = Z_PTR_P(zv);
  
  	if (!(c->flags & CONST_PERSISTENT)) {
  		zval_dtor(&c->value);
  	} else {
  		zval_internal_dtor(&c->value);
  	}
  	if (c->name) {
  		zend_string_release(c->name);
  	}
  	pefree(c, c->flags & CONST_PERSISTENT);
  }
  
  
  static void copy_zend_constant(zval *zv)
  {
  	zend_constant *c = Z_PTR_P(zv);
  
  	Z_PTR_P(zv) = pemalloc(sizeof(zend_constant), c->flags & CONST_PERSISTENT);
  	memcpy(Z_PTR_P(zv), c, sizeof(zend_constant));
  
  	c = Z_PTR_P(zv);
  	c->name = zend_string_copy(c->name);
  	if (!(c->flags & CONST_PERSISTENT)) {
  		zval_copy_ctor(&c->value);
  	} else {
  		if (Z_TYPE(c->value) == IS_STRING) {
  			Z_STR(c->value) = zend_string_dup(Z_STR(c->value), 1);
  		}
  	}
  }
  
  
  void zend_copy_constants(HashTable *target, HashTable *source)
  {
  	zend_hash_copy(target, source, copy_zend_constant);
  }
  
  
  static int clean_non_persistent_constant(zval *zv)
  {
  	zend_constant *c = Z_PTR_P(zv);
  	return (c->flags & CONST_PERSISTENT) ? ZEND_HASH_APPLY_STOP : ZEND_HASH_APPLY_REMOVE;
  }
  
  
  static int clean_non_persistent_constant_full(zval *zv)
  {
  	zend_constant *c = Z_PTR_P(zv);
  	return (c->flags & CONST_PERSISTENT) ? 0 : 1;
  }
  
  
  static int clean_module_constant(zval *el, void *arg)
  {
  	zend_constant *c = (zend_constant *)Z_PTR_P(el);
  	int module_number = *(int *)arg;
  
  	if (c->module_number == module_number) {
  		return 1;
  	} else {
  		return 0;
  	}
  }
  
  
  void clean_module_constants(int module_number)
  {
  	zend_hash_apply_with_argument(EG(zend_constants), clean_module_constant, (void *) &module_number);
  }
  
  
  int zend_startup_constants(void)
  {
  	EG(zend_constants) = (HashTable *) malloc(sizeof(HashTable));
  
  	zend_hash_init(EG(zend_constants), 128, NULL, ZEND_CONSTANT_DTOR, 1);
  	return SUCCESS;
  }
  
  
  
  void zend_register_standard_constants(void)
  {
  	REGISTER_MAIN_LONG_CONSTANT("E_ERROR", E_ERROR, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_RECOVERABLE_ERROR", E_RECOVERABLE_ERROR, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_WARNING", E_WARNING, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_PARSE", E_PARSE, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_NOTICE", E_NOTICE, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_STRICT", E_STRICT, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_DEPRECATED", E_DEPRECATED, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_CORE_ERROR", E_CORE_ERROR, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_CORE_WARNING", E_CORE_WARNING, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_COMPILE_ERROR", E_COMPILE_ERROR, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_COMPILE_WARNING", E_COMPILE_WARNING, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_USER_ERROR", E_USER_ERROR, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_USER_WARNING", E_USER_WARNING, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_USER_NOTICE", E_USER_NOTICE, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("E_USER_DEPRECATED", E_USER_DEPRECATED, CONST_PERSISTENT | CONST_CS);
  
  	REGISTER_MAIN_LONG_CONSTANT("E_ALL", E_ALL, CONST_PERSISTENT | CONST_CS);
  
  	REGISTER_MAIN_LONG_CONSTANT("DEBUG_BACKTRACE_PROVIDE_OBJECT", DEBUG_BACKTRACE_PROVIDE_OBJECT, CONST_PERSISTENT | CONST_CS);
  	REGISTER_MAIN_LONG_CONSTANT("DEBUG_BACKTRACE_IGNORE_ARGS", DEBUG_BACKTRACE_IGNORE_ARGS, CONST_PERSISTENT | CONST_CS);
  	/* true/false constants */
  	{
  		REGISTER_MAIN_BOOL_CONSTANT("TRUE", 1, CONST_PERSISTENT | CONST_CT_SUBST);
  		REGISTER_MAIN_BOOL_CONSTANT("FALSE", 0, CONST_PERSISTENT | CONST_CT_SUBST);
  		REGISTER_MAIN_BOOL_CONSTANT("ZEND_THREAD_SAFE", ZTS_V, CONST_PERSISTENT | CONST_CS);
  		REGISTER_MAIN_BOOL_CONSTANT("ZEND_DEBUG_BUILD", ZEND_DEBUG, CONST_PERSISTENT | CONST_CS);
  	}
  	REGISTER_MAIN_NULL_CONSTANT("NULL", CONST_PERSISTENT | CONST_CT_SUBST);
  }
  
  
  int zend_shutdown_constants(void)
  {
  	zend_hash_destroy(EG(zend_constants));
  	free(EG(zend_constants));
  	return SUCCESS;
  }
  
  
  void clean_non_persistent_constants(void)
  {
  	if (EG(full_tables_cleanup)) {
  		zend_hash_apply(EG(zend_constants), clean_non_persistent_constant_full);
  	} else {
  		zend_hash_reverse_apply(EG(zend_constants), clean_non_persistent_constant);
  	}
  }
  
  ZEND_API void zend_register_null_constant(const char *name, size_t name_len, int flags, int module_number)
  {
  	zend_constant c;
  
  	ZVAL_NULL(&c.value);
  	c.flags = flags;
  	c.name = zend_string_init(name, name_len, flags & CONST_PERSISTENT);
  	c.module_number = module_number;
  	zend_register_constant(&c);
  }
  
  ZEND_API void zend_register_bool_constant(const char *name, size_t name_len, zend_bool bval, int flags, int module_number)
  {
  	zend_constant c;
  
  	ZVAL_BOOL(&c.value, bval);
  	c.flags = flags;
  	c.name = zend_string_init(name, name_len, flags & CONST_PERSISTENT);
  	c.module_number = module_number;
  	zend_register_constant(&c);
  }
  
  ZEND_API void zend_register_long_constant(const char *name, size_t name_len, zend_long lval, int flags, int module_number)
  {
  	zend_constant c;
  
  	ZVAL_LONG(&c.value, lval);
  	c.flags = flags;
  	c.name = zend_string_init(name, name_len, flags & CONST_PERSISTENT);
  	c.module_number = module_number;
  	zend_register_constant(&c);
  }
  
  
  ZEND_API void zend_register_double_constant(const char *name, size_t name_len, double dval, int flags, int module_number)
  {
  	zend_constant c;
  
  	ZVAL_DOUBLE(&c.value, dval);
  	c.flags = flags;
  	c.name = zend_string_init(name, name_len, flags & CONST_PERSISTENT);
  	c.module_number = module_number;
  	zend_register_constant(&c);
  }
  
  
  ZEND_API void zend_register_stringl_constant(const char *name, size_t name_len, char *strval, size_t strlen, int flags, int module_number)
  {
  	zend_constant c;
  
  	ZVAL_NEW_STR(&c.value, zend_string_init(strval, strlen, flags & CONST_PERSISTENT));
  	c.flags = flags;
  	c.name = zend_string_init(name, name_len, flags & CONST_PERSISTENT);
  	c.module_number = module_number;
  	zend_register_constant(&c);
  }
  
  
  ZEND_API void zend_register_string_constant(const char *name, size_t name_len, char *strval, int flags, int module_number)
  {
  	zend_register_stringl_constant(name, name_len, strval, strlen(strval), flags, module_number);
  }
  
  static zend_constant *zend_get_special_constant(const char *name, size_t name_len)
  {
  	zend_constant *c;
  	static char haltoff[] = "__COMPILER_HALT_OFFSET__";
  
  	if (!EG(current_execute_data)) {
  		return NULL;
  	} else if (name_len == sizeof("__COMPILER_HALT_OFFSET__")-1 &&
  	          !memcmp(name, "__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__")-1)) {
  		const char *cfilename;
  		zend_string *haltname;
  		size_t clen;
  
  		cfilename = zend_get_executed_filename();
  		clen = strlen(cfilename);
  		/* check for __COMPILER_HALT_OFFSET__ */
  		haltname = zend_mangle_property_name(haltoff,
  			sizeof("__COMPILER_HALT_OFFSET__") - 1, cfilename, clen, 0);
  		c = zend_hash_find_ptr(EG(zend_constants), haltname);
  		zend_string_free(haltname);
  		return c;
  	} else {
  		return NULL;
  	}
  }
  
  
  ZEND_API zval *zend_get_constant_str(const char *name, size_t name_len)
  {
  	zend_constant *c;
  	ALLOCA_FLAG(use_heap)
  
  	if ((c = zend_hash_str_find_ptr(EG(zend_constants), name, name_len)) == NULL) {
  		char *lcname = do_alloca(name_len + 1, use_heap);
  		zend_str_tolower_copy(lcname, name, name_len);
  		if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, name_len)) != NULL) {
  			if (c->flags & CONST_CS) {
  				c = NULL;
  			}
  		} else {
  			c = zend_get_special_constant(name, name_len);
  		}
  		free_alloca(lcname, use_heap);
  	}
  
  	return c ? &c->value : NULL;
  }
  
  ZEND_API zval *zend_get_constant(zend_string *name)
  {
  	zend_constant *c;
  	ALLOCA_FLAG(use_heap)
  
  	if ((c = zend_hash_find_ptr(EG(zend_constants), name)) == NULL) {
  		char *lcname = do_alloca(ZSTR_LEN(name) + 1, use_heap);
  		zend_str_tolower_copy(lcname, ZSTR_VAL(name), ZSTR_LEN(name));
  		if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, ZSTR_LEN(name))) != NULL) {
  			if (c->flags & CONST_CS) {
  				c = NULL;
  			}
  		} else {
  			c = zend_get_special_constant(ZSTR_VAL(name), ZSTR_LEN(name));
  		}
  		free_alloca(lcname, use_heap);
  	}
  
  	return c ? &c->value : NULL;
  }
  
  ZEND_API zval *zend_get_constant_ex(zend_string *cname, zend_class_entry *scope, zend_ulong flags)
  {
  	zend_constant *c;
  	const char *colon;
  	zend_class_entry *ce = NULL;
  	zend_string *class_name;
  	const char *name = ZSTR_VAL(cname);
  	size_t name_len = ZSTR_LEN(cname);
  
  	/* Skip leading \\ */
  	if (name[0] == '\\') {
  		name += 1;
  		name_len -= 1;
  		cname = NULL;
  	}
  
  	if ((colon = zend_memrchr(name, ':', name_len)) &&
  	    colon > name && (*(colon - 1) == ':')) {
  		int class_name_len = colon - name - 1;
  		size_t const_name_len = name_len - class_name_len - 2;
  		zend_string *constant_name = zend_string_init(colon + 1, const_name_len, 0);
  		char *lcname;
  		zval *ret_constant = NULL;
  		ALLOCA_FLAG(use_heap)
  
  		class_name = zend_string_init(name, class_name_len, 0);
  		lcname = do_alloca(class_name_len + 1, use_heap);
  		zend_str_tolower_copy(lcname, name, class_name_len);
  		if (!scope) {
  			if (EG(current_execute_data)) {
  				scope = EG(scope);
  			} else {
  				scope = CG(active_class_entry);
  			}
  		}
  
  		if (class_name_len == sizeof("self")-1 &&
  		    !memcmp(lcname, "self", sizeof("self")-1)) {
  			if (UNEXPECTED(!scope)) {
  				zend_error(E_EXCEPTION | E_ERROR, "Cannot access self:: when no class scope is active");
  				return NULL;
  			}
  			ce = scope;
  		} else if (class_name_len == sizeof("parent")-1 &&
  		           !memcmp(lcname, "parent", sizeof("parent")-1)) {
  			if (UNEXPECTED(!scope)) {
  				zend_error(E_EXCEPTION | E_ERROR, "Cannot access parent:: when no class scope is active");
  				return NULL;
  			} else if (UNEXPECTED(!scope->parent)) {
  				zend_error(E_EXCEPTION | E_ERROR, "Cannot access parent:: when current class scope has no parent");
  				return NULL;
  			} else {
  				ce = scope->parent;
  			}
  		} else if (class_name_len == sizeof("static")-1 &&
  		           !memcmp(lcname, "static", sizeof("static")-1)) {
  			ce = zend_get_called_scope(EG(current_execute_data));
  			if (UNEXPECTED(!ce)) {
  				zend_error(E_EXCEPTION | E_ERROR, "Cannot access static:: when no class scope is active");
  				return NULL;
  			}
  		} else {
  			ce = zend_fetch_class(class_name, flags);
  		}
  		free_alloca(lcname, use_heap);
  		if (ce) {
  			ret_constant = zend_hash_find(&ce->constants_table, constant_name);
  			if (ret_constant == NULL) {
  				if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) {
  					zend_error(E_EXCEPTION | E_ERROR, "Undefined class constant '%s::%s'", ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
  					zend_string_release(class_name);
  					zend_string_free(constant_name);
  					return NULL;
  				}
  			} else if (Z_ISREF_P(ret_constant)) {
  				ret_constant = Z_REFVAL_P(ret_constant);
  			}
  		}
  		zend_string_release(class_name);
  		zend_string_free(constant_name);
  		if (ret_constant && Z_CONSTANT_P(ret_constant)) {
  			if (UNEXPECTED(zval_update_constant_ex(ret_constant, 1, ce) != SUCCESS)) {
  				return NULL;
  			}
  		}
  		return ret_constant;
  	}
  
  	/* non-class constant */
  	if ((colon = zend_memrchr(name, '\\', name_len)) != NULL) {
  		/* compound constant name */
  		int prefix_len = colon - name;
  		size_t const_name_len = name_len - prefix_len - 1;
  		const char *constant_name = colon + 1;
  		char *lcname;
  		size_t lcname_len;
  		ALLOCA_FLAG(use_heap)
  
  		lcname_len = prefix_len + 1 + const_name_len;
  		lcname = do_alloca(lcname_len + 1, use_heap);
  		zend_str_tolower_copy(lcname, name, prefix_len);
  		/* Check for namespace constant */
  
  		lcname[prefix_len] = '\\';
  		memcpy(lcname + prefix_len + 1, constant_name, const_name_len + 1);
  
  		if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, lcname_len)) == NULL) {
  			/* try lowercase */
  			zend_str_tolower(lcname + prefix_len + 1, const_name_len);
  			if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, lcname_len)) != NULL) {
  				if ((c->flags & CONST_CS) != 0) {
  					c = NULL;
  				}
  			}
  		}
  		free_alloca(lcname, use_heap);
  		if (c) {
  			return &c->value;
  		}
  		/* name requires runtime resolution, need to check non-namespaced name */
  		if ((flags & IS_CONSTANT_UNQUALIFIED) != 0) {
  			return zend_get_constant_str(constant_name, const_name_len);
  		}
  		return NULL;
  	}
  
  	if (cname) {
  		return zend_get_constant(cname);
  	} else {
  		return zend_get_constant_str(name, name_len);
  	}
  }
  
  zend_constant *zend_quick_get_constant(const zval *key, zend_ulong flags)
  {
  	zend_constant *c;
  
  	if ((c = zend_hash_find_ptr(EG(zend_constants), Z_STR_P(key))) == NULL) {
  		key++;
  		if ((c = zend_hash_find_ptr(EG(zend_constants), Z_STR_P(key))) == NULL ||
  		    (c->flags & CONST_CS) != 0) {
  			if ((flags & (IS_CONSTANT_IN_NAMESPACE|IS_CONSTANT_UNQUALIFIED)) == (IS_CONSTANT_IN_NAMESPACE|IS_CONSTANT_UNQUALIFIED)) {
  				key++;
  				if ((c = zend_hash_find_ptr(EG(zend_constants), Z_STR_P(key))) == NULL) {
  				    key++;
  					if ((c = zend_hash_find_ptr(EG(zend_constants), Z_STR_P(key))) == NULL ||
  					    (c->flags & CONST_CS) != 0) {
  
  						key--;
  						c = NULL;
  					}
  				}
  			} else {
  				key--;
  				c = NULL;
  			}
  		}
  	}
  	return c;
  }
  
  static void* zend_hash_add_constant(HashTable *ht, zend_string *key, zend_constant *c)
  {
  	void *ret;
  	zend_constant *copy = pemalloc(sizeof(zend_constant), c->flags & CONST_PERSISTENT);
  
  	memcpy(copy, c, sizeof(zend_constant));
  	ret = zend_hash_add_ptr(ht, key, copy);
  	if (!ret) {
  		pefree(copy, c->flags & CONST_PERSISTENT);
  	}
  	return ret;
  }
  
  ZEND_API int zend_register_constant(zend_constant *c)
  {
  	zend_string *lowercase_name = NULL;
  	zend_string *name;
  	int ret = SUCCESS;
  
  #if 0
  	printf("Registering constant for module %d\n", c->module_number);
  #endif
  
  	if (!(c->flags & CONST_CS)) {
  		lowercase_name = zend_string_alloc(ZSTR_LEN(c->name), c->flags & CONST_PERSISTENT);
  		zend_str_tolower_copy(ZSTR_VAL(lowercase_name), ZSTR_VAL(c->name), ZSTR_LEN(c->name));
  		lowercase_name = zend_new_interned_string(lowercase_name);
  		name = lowercase_name;
  	} else {
  		char *slash = strrchr(ZSTR_VAL(c->name), '\\');
  		if (slash) {
  			lowercase_name = zend_string_init(ZSTR_VAL(c->name), ZSTR_LEN(c->name), c->flags & CONST_PERSISTENT);
  			zend_str_tolower(ZSTR_VAL(lowercase_name), slash - ZSTR_VAL(c->name));
  			lowercase_name = zend_new_interned_string(lowercase_name);
  			name = lowercase_name;
  		} else {
  			name = c->name;
  		}
  	}
  
  	/* Check if the user is trying to define the internal pseudo constant name __COMPILER_HALT_OFFSET__ */
  	if ((ZSTR_LEN(c->name) == sizeof("__COMPILER_HALT_OFFSET__")-1
  		&& !memcmp(ZSTR_VAL(name), "__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__")-1))
  		|| zend_hash_add_constant(EG(zend_constants), name, c) == NULL) {
  
  		/* The internal __COMPILER_HALT_OFFSET__ is prefixed by NULL byte */
  		if (ZSTR_VAL(c->name)[0] == '\0' && ZSTR_LEN(c->name) > sizeof("\0__COMPILER_HALT_OFFSET__")-1
  			&& memcmp(ZSTR_VAL(name), "\0__COMPILER_HALT_OFFSET__", sizeof("\0__COMPILER_HALT_OFFSET__")) == 0) {
  		}
  		zend_error(E_NOTICE,"Constant %s already defined", ZSTR_VAL(name));
  		zend_string_release(c->name);
  		if (!(c->flags & CONST_PERSISTENT)) {
  			zval_dtor(&c->value);
  		}
  		ret = FAILURE;
  	}
  	if (lowercase_name) {
  		zend_string_release(lowercase_name);
  	}
  	return ret;
  }
  
  
  /*
   * Local variables:
   * tab-width: 4
   * c-basic-offset: 4
   * indent-tabs-mode: t
   * End:
   */
  