php-src/Zend/zend_execute_API.c

/*
   +----------------------------------------------------------------------+
   | 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 <stdio.h>
#include <signal.h>

#include "zend.h"
#include "zend_compile.h"
#include "zend_execute.h"
#include "zend_API.h"
#include "zend_stack.h"
#include "zend_constants.h"
#include "zend_extensions.h"
#include "zend_exceptions.h"
#include "zend_closures.h"
#include "zend_generators.h"
#include "zend_vm.h"
#include "zend_float.h"
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif

ZEND_API void (*zend_execute_ex)(zend_execute_data *execute_data);
ZEND_API void (*zend_execute_internal)(zend_execute_data *execute_data, zval *return_value);

/* true globals */
ZEND_API const zend_fcall_info empty_fcall_info = { 0, NULL, {{0}, {{0}}, {0}}, NULL, NULL, NULL, NULL, 0, 0 };
ZEND_API const zend_fcall_info_cache empty_fcall_info_cache = { 0, NULL, NULL, NULL, NULL };

#ifdef ZEND_WIN32
#ifdef ZTS
__declspec(thread)
#endif
HANDLE tq_timer = NULL;
#endif

#if 0&&ZEND_DEBUG
static void (*original_sigsegv_handler)(int);
static void zend_handle_sigsegv(int dummy) /* {{{ */
{
	fflush(stdout);
	fflush(stderr);
	if (original_sigsegv_handler == zend_handle_sigsegv) {
		signal(SIGSEGV, original_sigsegv_handler);
	} else {
		signal(SIGSEGV, SIG_DFL);
	}
	{

		fprintf(stderr, "SIGSEGV caught on opcode %d on opline %d of %s() at %s:%d\n\n",
				active_opline->opcode,
				active_opline-EG(active_op_array)->opcodes,
				get_active_function_name(),
				zend_get_executed_filename(),
				zend_get_executed_lineno());
/* See http://support.microsoft.com/kb/190351 */
#ifdef PHP_WIN32
		fflush(stderr);
#endif
	}
	if (original_sigsegv_handler!=zend_handle_sigsegv) {
		original_sigsegv_handler(dummy);
	}
}
/* }}} */
#endif

static void zend_extension_activator(zend_extension *extension) /* {{{ */
{
	if (extension->activate) {
		extension->activate();
	}
}
/* }}} */

static void zend_extension_deactivator(zend_extension *extension) /* {{{ */
{
	if (extension->deactivate) {
		extension->deactivate();
	}
}
/* }}} */

static int clean_non_persistent_function(zval *zv) /* {{{ */
{
	zend_function *function = Z_PTR_P(zv);
	return (function->type == ZEND_INTERNAL_FUNCTION) ? ZEND_HASH_APPLY_STOP : ZEND_HASH_APPLY_REMOVE;
}
/* }}} */

ZEND_API int clean_non_persistent_function_full(zval *zv) /* {{{ */
{
	zend_function *function = Z_PTR_P(zv);
	return (function->type == ZEND_INTERNAL_FUNCTION) ? ZEND_HASH_APPLY_KEEP : ZEND_HASH_APPLY_REMOVE;
}
/* }}} */

static int clean_non_persistent_class(zval *zv) /* {{{ */
{
	zend_class_entry *ce = Z_PTR_P(zv);
	return (ce->type == ZEND_INTERNAL_CLASS) ? ZEND_HASH_APPLY_STOP : ZEND_HASH_APPLY_REMOVE;
}
/* }}} */

ZEND_API int clean_non_persistent_class_full(zval *zv) /* {{{ */
{
	zend_class_entry *ce = Z_PTR_P(zv);
	return (ce->type == ZEND_INTERNAL_CLASS) ? ZEND_HASH_APPLY_KEEP : ZEND_HASH_APPLY_REMOVE;
}
/* }}} */

void init_executor(void) /* {{{ */
{
	zend_init_fpu();

	ZVAL_NULL(&EG(uninitialized_zval));
	ZVAL_NULL(&EG(error_zval));
/* destroys stack frame, therefore makes core dumps worthless */
#if 0&&ZEND_DEBUG
	original_sigsegv_handler = signal(SIGSEGV, zend_handle_sigsegv);
#endif

	EG(symtable_cache_ptr) = EG(symtable_cache) - 1;
	EG(symtable_cache_limit) = EG(symtable_cache) + SYMTABLE_CACHE_SIZE - 1;
	EG(no_extensions) = 0;

	EG(function_table) = CG(function_table);
	EG(class_table) = CG(class_table);

	EG(in_autoload) = NULL;
	EG(autoload_func) = NULL;
	EG(error_handling) = EH_NORMAL;

	zend_vm_stack_init();

	zend_hash_init(&EG(symbol_table), 64, NULL, ZVAL_PTR_DTOR, 0);
	EG(valid_symbol_table) = 1;

	zend_llist_apply(&zend_extensions, (llist_apply_func_t) zend_extension_activator);

	zend_hash_init(&EG(included_files), 8, NULL, NULL, 0);

	EG(ticks_count) = 0;

	ZVAL_UNDEF(&EG(user_error_handler));

	EG(current_execute_data) = NULL;

	zend_stack_init(&EG(user_error_handlers_error_reporting), sizeof(int));
	zend_stack_init(&EG(user_error_handlers), sizeof(zval));
	zend_stack_init(&EG(user_exception_handlers), sizeof(zval));

	zend_objects_store_init(&EG(objects_store), 1024);

	EG(full_tables_cleanup) = 0;
#ifdef ZEND_WIN32
	EG(timed_out) = 0;
#endif

	EG(exception) = NULL;
	EG(prev_exception) = NULL;

	EG(scope) = NULL;

	EG(ht_iterators_count) = sizeof(EG(ht_iterators_slots)) / sizeof(HashTableIterator);
	EG(ht_iterators_used) = 0;
	EG(ht_iterators) = EG(ht_iterators_slots);
	memset(EG(ht_iterators), 0, sizeof(EG(ht_iterators_slots)));

	EG(active) = 1;
}
/* }}} */

static int zval_call_destructor(zval *zv) /* {{{ */
{
	if (Z_TYPE_P(zv) == IS_INDIRECT) {
		zv = Z_INDIRECT_P(zv);
	}
	if (Z_TYPE_P(zv) == IS_OBJECT && Z_REFCOUNT_P(zv) == 1) {
		return ZEND_HASH_APPLY_REMOVE;
	} else {
		return ZEND_HASH_APPLY_KEEP;
	}
}
/* }}} */

static void zend_unclean_zval_ptr_dtor(zval *zv) /* {{{ */
{

	if (Z_TYPE_P(zv) == IS_INDIRECT) {
		zv = Z_INDIRECT_P(zv);
	}
	i_zval_ptr_dtor(zv ZEND_FILE_LINE_CC);
}
/* }}} */

void shutdown_destructors(void) /* {{{ */
{
	if (CG(unclean_shutdown)) {
		EG(symbol_table).pDestructor = zend_unclean_zval_ptr_dtor;
	}
	zend_try {
		uint32_t symbols;
		do {
			symbols = zend_hash_num_elements(&EG(symbol_table));
			zend_hash_reverse_apply(&EG(symbol_table), (apply_func_t) zval_call_destructor);
		} while (symbols != zend_hash_num_elements(&EG(symbol_table)));
		zend_objects_store_call_destructors(&EG(objects_store));
	} zend_catch {
		/* if we couldn't destruct cleanly, mark all objects as destructed anyway */
		zend_objects_store_mark_destructed(&EG(objects_store));
	} zend_end_try();
}
/* }}} */

void shutdown_executor(void) /* {{{ */
{
	zend_function *func;
	zend_class_entry *ce;

	zend_try {

/* Removed because this can not be safely done, e.g. in this situation:
   Object 1 creates object 2
   Object 3 holds reference to object 2.
   Now when 1 and 2 are destroyed, 3 can still access 2 in its destructor, with
   very problematic results */
/* 		zend_objects_store_call_destructors(&EG(objects_store)); */

/* Moved after symbol table cleaners, because  some of the cleaners can call
   destructors, which would use EG(symtable_cache_ptr) and thus leave leaks */
/*		while (EG(symtable_cache_ptr)>=EG(symtable_cache)) {
			zend_hash_destroy(*EG(symtable_cache_ptr));
			efree(*EG(symtable_cache_ptr));
			EG(symtable_cache_ptr)--;
		}
*/
		zend_llist_apply(&zend_extensions, (llist_apply_func_t) zend_extension_deactivator);

		if (CG(unclean_shutdown)) {
			EG(symbol_table).pDestructor = zend_unclean_zval_ptr_dtor;
		}
		zend_hash_graceful_reverse_destroy(&EG(symbol_table));
	} zend_end_try();
	EG(valid_symbol_table) = 0;

	zend_try {
		zval *zeh;
		/* remove error handlers before destroying classes and functions,
		 * so that if handler used some class, crash would not happen */
		if (Z_TYPE(EG(user_error_handler)) != IS_UNDEF) {
			zeh = &EG(user_error_handler);
			zval_ptr_dtor(zeh);
			ZVAL_UNDEF(&EG(user_error_handler));
		}

		if (Z_TYPE(EG(user_exception_handler)) != IS_UNDEF) {
			zeh = &EG(user_exception_handler);
			zval_ptr_dtor(zeh);
			ZVAL_UNDEF(&EG(user_exception_handler));
		}

		zend_stack_clean(&EG(user_error_handlers_error_reporting), NULL, 1);
		zend_stack_clean(&EG(user_error_handlers), (void (*)(void *))ZVAL_DESTRUCTOR, 1);
		zend_stack_clean(&EG(user_exception_handlers), (void (*)(void *))ZVAL_DESTRUCTOR, 1);
	} zend_end_try();

	zend_try {
		/* Cleanup static data for functions and arrays.
		 * We need a separate cleanup stage because of the following problem:
		 * Suppose we destroy class X, which destroys the class's function table,
		 * and in the function table we have function foo() that has static $bar.
		 * Now if an object of class X is assigned to $bar, its destructor will be
		 * called and will fail since X's function table is in mid-destruction.
		 * So we want first of all to clean up all data and then move to tables destruction.
		 * Note that only run-time accessed data need to be cleaned up, pre-defined data can
		 * not contain objects and thus are not probelmatic */
		if (EG(full_tables_cleanup)) {
			ZEND_HASH_FOREACH_PTR(EG(function_table), func) {
				if (func->type == ZEND_USER_FUNCTION) {
					zend_cleanup_op_array_data((zend_op_array *) func);
				}
			} ZEND_HASH_FOREACH_END();
			ZEND_HASH_REVERSE_FOREACH_PTR(EG(class_table), ce) {
				if (ce->type == ZEND_USER_CLASS) {
					zend_cleanup_user_class_data(ce);
				} else {
					zend_cleanup_internal_class_data(ce);
				}
			} ZEND_HASH_FOREACH_END();
		} else {
			ZEND_HASH_REVERSE_FOREACH_PTR(EG(function_table), func) {
				if (func->type != ZEND_USER_FUNCTION) {
					break;
				}
				zend_cleanup_op_array_data((zend_op_array *) func);
			} ZEND_HASH_FOREACH_END();
			ZEND_HASH_REVERSE_FOREACH_PTR(EG(class_table), ce) {
				if (ce->type != ZEND_USER_CLASS) {
					break;
				}
				zend_cleanup_user_class_data(ce);
			} ZEND_HASH_FOREACH_END();
			zend_cleanup_internal_classes();
		}
	} zend_end_try();

	zend_try {
		zend_llist_destroy(&CG(open_files));
	} zend_end_try();

	zend_try {
		zend_close_rsrc_list(&EG(regular_list));
	} zend_end_try();

#if ZEND_DEBUG
	if (GC_G(gc_enabled) && !CG(unclean_shutdown)) {
		gc_collect_cycles();
	}
#endif

	zend_try {
		zend_objects_store_free_object_storage(&EG(objects_store));

		zend_vm_stack_destroy();

		/* Destroy all op arrays */
		if (EG(full_tables_cleanup)) {
			zend_hash_reverse_apply(EG(function_table), clean_non_persistent_function_full);
			zend_hash_reverse_apply(EG(class_table), clean_non_persistent_class_full);
		} else {
			zend_hash_reverse_apply(EG(function_table), clean_non_persistent_function);
			zend_hash_reverse_apply(EG(class_table), clean_non_persistent_class);
		}

		while (EG(symtable_cache_ptr)>=EG(symtable_cache)) {
			zend_hash_destroy(*EG(symtable_cache_ptr));
			FREE_HASHTABLE(*EG(symtable_cache_ptr));
			EG(symtable_cache_ptr)--;
		}
	} zend_end_try();

	zend_try {
		clean_non_persistent_constants();
	} zend_end_try();

	zend_try {
#if 0&&ZEND_DEBUG
	signal(SIGSEGV, original_sigsegv_handler);
#endif

		zend_hash_destroy(&EG(included_files));

		zend_stack_destroy(&EG(user_error_handlers_error_reporting));
		zend_stack_destroy(&EG(user_error_handlers));
		zend_stack_destroy(&EG(user_exception_handlers));
		zend_objects_store_destroy(&EG(objects_store));
		if (EG(in_autoload)) {
			zend_hash_destroy(EG(in_autoload));
			FREE_HASHTABLE(EG(in_autoload));
		}
	} zend_end_try();

	zend_shutdown_fpu();

	EG(ht_iterators_used) = 0;
	if (EG(ht_iterators) != EG(ht_iterators_slots)) {
		efree(EG(ht_iterators));
	}

	EG(active) = 0;
}
/* }}} */

/* return class name and "::" or "". */
ZEND_API const char *get_active_class_name(const char **space) /* {{{ */
{
	zend_function *func;

	if (!zend_is_executing()) {
		if (space) {
			*space = "";
		}
		return "";
	}

	func = EG(current_execute_data)->func;
	switch (func->type) {
		case ZEND_USER_FUNCTION:
		case ZEND_INTERNAL_FUNCTION:
		{
			zend_class_entry *ce = func->common.scope;

			if (space) {
				*space = ce ? "::" : "";
			}
			return ce ? ce->name->val : "";
		}
		default:
			if (space) {
				*space = "";
			}
			return "";
	}
}
/* }}} */

ZEND_API const char *get_active_function_name(void) /* {{{ */
{
	zend_function *func;

	if (!zend_is_executing()) {
		return NULL;
	}
	func = EG(current_execute_data)->func;
	switch (func->type) {
		case ZEND_USER_FUNCTION: {
				zend_string *function_name = func->common.function_name;

				if (function_name) {
					return function_name->val;
				} else {
					return "main";
				}
			}
			break;
		case ZEND_INTERNAL_FUNCTION:
			return func->common.function_name->val;
			break;
		default:
			return NULL;
	}
}
/* }}} */

ZEND_API const char *zend_get_executed_filename(void) /* {{{ */
{
	zend_execute_data *ex = EG(current_execute_data);

	while (ex && (!ex->func || !ZEND_USER_CODE(ex->func->type))) {
		ex = ex->prev_execute_data;
	}
	if (ex) {
		return ex->func->op_array.filename->val;
	} else {
		return "[no active file]";
	}
}
/* }}} */

ZEND_API zend_string *zend_get_executed_filename_ex(void) /* {{{ */
{
	zend_execute_data *ex = EG(current_execute_data);

	while (ex && (!ex->func || !ZEND_USER_CODE(ex->func->type))) {
		ex = ex->prev_execute_data;
	}
	if (ex) {
		return ex->func->op_array.filename;
	} else {
		return NULL;
	}
}
/* }}} */

ZEND_API uint zend_get_executed_lineno(void) /* {{{ */
{
	zend_execute_data *ex = EG(current_execute_data);

	while (ex && (!ex->func || !ZEND_USER_CODE(ex->func->type))) {
		ex = ex->prev_execute_data;
	}
	if (ex) {
		if (EG(exception) && ex->opline->opcode == ZEND_HANDLE_EXCEPTION &&
		    ex->opline->lineno == 0 && EG(opline_before_exception)) {
			return EG(opline_before_exception)->lineno;
		}
		return ex->opline->lineno;
	} else {
		return 0;
	}
}
/* }}} */

ZEND_API zend_bool zend_is_executing(void) /* {{{ */
{
	return EG(current_execute_data) != 0;
}
/* }}} */

ZEND_API void _zval_ptr_dtor(zval *zval_ptr ZEND_FILE_LINE_DC) /* {{{ */
{
	i_zval_ptr_dtor(zval_ptr ZEND_FILE_LINE_RELAY_CC);
}
/* }}} */

ZEND_API void _zval_internal_ptr_dtor(zval *zval_ptr ZEND_FILE_LINE_DC) /* {{{ */
{
	if (Z_REFCOUNTED_P(zval_ptr)) {
		Z_DELREF_P(zval_ptr);
		if (Z_REFCOUNT_P(zval_ptr) == 0) {
			_zval_internal_dtor_for_ptr(zval_ptr ZEND_FILE_LINE_CC);
		}
	}
}
/* }}} */

#define IS_VISITED_CONSTANT			0x80
#define IS_CONSTANT_VISITED(p)		(Z_TYPE_P(p) & IS_VISITED_CONSTANT)
#define MARK_CONSTANT_VISITED(p)	Z_TYPE_INFO_P(p) |= IS_VISITED_CONSTANT
#define RESET_CONSTANT_VISITED(p)	Z_TYPE_INFO_P(p) &= ~IS_VISITED_CONSTANT

ZEND_API int zval_update_constant_ex(zval *p, zend_bool inline_change, zend_class_entry *scope) /* {{{ */
{
	zval *const_value;
	char *colon;

	if (IS_CONSTANT_VISITED(p)) {
		zend_error(E_EXCEPTION | E_ERROR, "Cannot declare self-referencing constant '%s'", Z_STRVAL_P(p));
		return FAILURE;
	} else if (Z_TYPE_P(p) == IS_CONSTANT) {
		int refcount;

		SEPARATE_ZVAL_NOREF(p);
		MARK_CONSTANT_VISITED(p);
		refcount =  Z_REFCOUNTED_P(p) ? Z_REFCOUNT_P(p) : 1;
		if (Z_CONST_FLAGS_P(p) & IS_CONSTANT_CLASS) {
			ZEND_ASSERT(EG(current_execute_data));
			if (inline_change) {
				zend_string_release(Z_STR_P(p));
			}
			if (EG(scope) && EG(scope)->name) {
				ZVAL_STR_COPY(p, EG(scope)->name);
			} else {
				ZVAL_EMPTY_STRING(p);
			}
		} else if (UNEXPECTED((const_value = zend_get_constant_ex(Z_STR_P(p), scope, Z_CONST_FLAGS_P(p))) == NULL)) {
			char *actual = Z_STRVAL_P(p);

			if (UNEXPECTED(EG(exception))) {
				RESET_CONSTANT_VISITED(p);
				return FAILURE;
			} else if ((colon = (char*)zend_memrchr(Z_STRVAL_P(p), ':', Z_STRLEN_P(p)))) {
				zend_error(E_EXCEPTION | E_ERROR, "Undefined class constant '%s'", Z_STRVAL_P(p));
				RESET_CONSTANT_VISITED(p);
				return FAILURE;
			} else {
				zend_string *save = Z_STR_P(p);
				char *slash;
				size_t actual_len = Z_STRLEN_P(p);
				if ((Z_CONST_FLAGS_P(p) & IS_CONSTANT_UNQUALIFIED) && (slash = (char *)zend_memrchr(actual, '\\', actual_len))) {
					actual = slash + 1;
					actual_len -= (actual - Z_STRVAL_P(p));
					if (inline_change) {
						zend_string *s = zend_string_init(actual, actual_len, 0);
						Z_STR_P(p) = s;
						Z_TYPE_FLAGS_P(p) = IS_TYPE_REFCOUNTED | IS_TYPE_COPYABLE;
					}
				}
				if (actual[0] == '\\') {
					if (inline_change) {
						memmove(Z_STRVAL_P(p), Z_STRVAL_P(p)+1, Z_STRLEN_P(p));
						--Z_STRLEN_P(p);
					} else {
						++actual;
					}
					--actual_len;
				}
				if ((Z_CONST_FLAGS_P(p) & IS_CONSTANT_UNQUALIFIED) == 0) {
					if (save->val[0] == '\\') {
						zend_error(E_EXCEPTION | E_ERROR, "Undefined constant '%s'", save->val + 1);
					} else {
						zend_error(E_EXCEPTION | E_ERROR, "Undefined constant '%s'", save->val);
					}
					if (inline_change) {
						zend_string_release(save);
					}
					RESET_CONSTANT_VISITED(p);
					return FAILURE;
				} else {
					zend_error(E_NOTICE, "Use of undefined constant %s - assumed '%s'",  actual,  actual);
					if (!inline_change) {
						ZVAL_STRINGL(p, actual, actual_len);
					} else {
						Z_TYPE_INFO_P(p) = Z_REFCOUNTED_P(p) ?
							IS_STRING_EX : IS_INTERNED_STRING_EX;
						if (save && save->val != actual) {
							zend_string_release(save);
						}
					}
				}
			}
		} else {
			if (inline_change) {
				zend_string_release(Z_STR_P(p));
			}
			ZVAL_COPY_VALUE(p, const_value);
			if (Z_OPT_CONSTANT_P(p)) {
				if (UNEXPECTED(zval_update_constant_ex(p, 1, NULL) != SUCCESS)) {
					RESET_CONSTANT_VISITED(p);
					return FAILURE;
				}
			}
			zval_opt_copy_ctor(p);
		}

		if (Z_REFCOUNTED_P(p)) Z_SET_REFCOUNT_P(p, refcount);
	} else if (Z_TYPE_P(p) == IS_CONSTANT_AST) {
		zval tmp;

		if (UNEXPECTED(zend_ast_evaluate(&tmp, Z_ASTVAL_P(p), scope) != SUCCESS)) {
			return FAILURE;
		}
		if (inline_change) {
			zval_ptr_dtor(p);
		}
		ZVAL_COPY_VALUE(p, &tmp);
	}
	return SUCCESS;
}
/* }}} */

ZEND_API int zval_update_constant(zval *pp, zend_bool inline_change) /* {{{ */
{
	return zval_update_constant_ex(pp, inline_change, NULL);
}
/* }}} */

int call_user_function(HashTable *function_table, zval *object, zval *function_name, zval *retval_ptr, uint32_t param_count, zval params[]) /* {{{ */
{
	return call_user_function_ex(function_table, object, function_name, retval_ptr, param_count, params, 1, NULL);
}
/* }}} */

int call_user_function_ex(HashTable *function_table, zval *object, zval *function_name, zval *retval_ptr, uint32_t param_count, zval params[], int no_separation, zend_array *symbol_table) /* {{{ */
{
	zend_fcall_info fci;

	fci.size = sizeof(fci);
	fci.function_table = function_table;
	fci.object = object ? Z_OBJ_P(object) : NULL;
	ZVAL_COPY_VALUE(&fci.function_name, function_name);
	fci.retval = retval_ptr;
	fci.param_count = param_count;
	fci.params = params;
	fci.no_separation = (zend_bool) no_separation;
	fci.symbol_table = symbol_table;

	return zend_call_function(&fci, NULL);
}
/* }}} */

int zend_call_function(zend_fcall_info *fci, zend_fcall_info_cache *fci_cache) /* {{{ */
{
	uint32_t i;
	zend_class_entry *calling_scope = NULL;
	zend_execute_data *call, dummy_execute_data;
	zend_fcall_info_cache fci_cache_local;
	zend_function *func;
	zend_class_entry *orig_scope;

	ZVAL_UNDEF(fci->retval);

	if (!EG(active)) {
		return FAILURE; /* executor is already inactive */
	}

	if (EG(exception)) {
		return FAILURE; /* we would result in an instable executor otherwise */
	}

	switch (fci->size) {
		case sizeof(zend_fcall_info):
			break; /* nothing to do currently */
		default:
			zend_error_noreturn(E_CORE_ERROR, "Corrupted fcall_info provided to zend_call_function()");
			break;
	}

	orig_scope = EG(scope);

	/* Initialize execute_data */
	if (!EG(current_execute_data)) {
		/* This only happens when we're called outside any execute()'s
		 * It shouldn't be strictly necessary to NULL execute_data out,
		 * but it may make bugs easier to spot
		 */
		memset(&dummy_execute_data, 0, sizeof(zend_execute_data));
		EG(current_execute_data) = &dummy_execute_data;
	} else if (EG(current_execute_data)->func &&
	           ZEND_USER_CODE(EG(current_execute_data)->func->common.type) &&
	           EG(current_execute_data)->opline->opcode != ZEND_DO_FCALL &&
	           EG(current_execute_data)->opline->opcode != ZEND_DO_ICALL &&
	           EG(current_execute_data)->opline->opcode != ZEND_DO_UCALL &&
	           EG(current_execute_data)->opline->opcode != ZEND_DO_FCALL_BY_NAME) {
		/* Insert fake frame in case of include or magic calls */
		dummy_execute_data = *EG(current_execute_data);
		dummy_execute_data.prev_execute_data = EG(current_execute_data);
		dummy_execute_data.call = NULL;
		dummy_execute_data.opline = NULL;
		dummy_execute_data.func = NULL;
		EG(current_execute_data) = &dummy_execute_data;
	}

	if (!fci_cache || !fci_cache->initialized) {
		zend_string *callable_name;
		char *error = NULL;

		if (!fci_cache) {
			fci_cache = &fci_cache_local;
		}

		if (!zend_is_callable_ex(&fci->function_name, fci->object, IS_CALLABLE_CHECK_SILENT, &callable_name, fci_cache, &error)) {
			if (error) {
				zend_error(E_WARNING, "Invalid callback %s, %s", callable_name->val, error);
				efree(error);
			}
			if (callable_name) {
				zend_string_release(callable_name);
			}
			if (EG(current_execute_data) == &dummy_execute_data) {
				EG(current_execute_data) = dummy_execute_data.prev_execute_data;
			}
			return FAILURE;
		} else if (error) {
			/* Capitalize the first latter of the error message */
			if (error[0] >= 'a' && error[0] <= 'z') {
				error[0] += ('A' - 'a');
			}
			zend_error(E_DEPRECATED, "%s", error);
			efree(error);
		}
		zend_string_release(callable_name);
	}

	func = fci_cache->function_handler;
	call = zend_vm_stack_push_call_frame(ZEND_CALL_TOP_FUNCTION,
		func, fci->param_count, fci_cache->called_scope, fci_cache->object);
	calling_scope = fci_cache->calling_scope;
	fci->object = fci_cache->object;
	if (fci->object &&
	    (!EG(objects_store).object_buckets ||
	     !IS_OBJ_VALID(EG(objects_store).object_buckets[fci->object->handle]))) {
		if (EG(current_execute_data) == &dummy_execute_data) {
			EG(current_execute_data) = dummy_execute_data.prev_execute_data;
		}
		return FAILURE;
	}

	if (func->common.fn_flags & (ZEND_ACC_ABSTRACT|ZEND_ACC_DEPRECATED)) {
		if (func->common.fn_flags & ZEND_ACC_ABSTRACT) {
			zend_error(E_EXCEPTION | E_ERROR, "Cannot call abstract method %s::%s()", func->common.scope->name->val, func->common.function_name->val);
			return FAILURE;
		}
		if (func->common.fn_flags & ZEND_ACC_DEPRECATED) {
 			zend_error(E_DEPRECATED, "Function %s%s%s() is deprecated",
				func->common.scope ? func->common.scope->name->val : "",
				func->common.scope ? "::" : "",
				func->common.function_name->val);
		}
	}

	for (i=0; i<fci->param_count; i++) {
		zval *param;
		zval *arg = &fci->params[i];

		if (ARG_SHOULD_BE_SENT_BY_REF(func, i + 1)) {
			if (UNEXPECTED(!Z_ISREF_P(arg))) {
				if (fci->no_separation &&
					!ARG_MAY_BE_SENT_BY_REF(func, i + 1)) {
					if (i) {
						/* hack to clean up the stack */
						ZEND_CALL_NUM_ARGS(call) = i;
						zend_vm_stack_free_args(call);
					}
					zend_vm_stack_free_call_frame(call);

					zend_error(E_WARNING, "Parameter %d to %s%s%s() expected to be a reference, value given",
						i+1,
						func->common.scope ? func->common.scope->name->val : "",
						func->common.scope ? "::" : "",
						func->common.function_name->val);
					if (EG(current_execute_data) == &dummy_execute_data) {
						EG(current_execute_data) = dummy_execute_data.prev_execute_data;
					}
					return FAILURE;
				}

				ZVAL_NEW_REF(arg, arg);
			}
			Z_ADDREF_P(arg);
		} else {
			if (Z_ISREF_P(arg) &&
			    !(func->common.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE)) {
				/* don't separate references for __call */
				arg = Z_REFVAL_P(arg);
			}
			if (Z_OPT_REFCOUNTED_P(arg)) {
				Z_ADDREF_P(arg);
			}
		}
		param = ZEND_CALL_ARG(call, i+1);
		ZVAL_COPY_VALUE(param, arg);
	}

	EG(scope) = calling_scope;
	if (func->common.fn_flags & ZEND_ACC_STATIC) {
		fci->object = NULL;
	}
	if (!fci->object) {
		Z_OBJ(call->This) = NULL;
	} else {
		Z_OBJ(call->This) = fci->object;
		GC_REFCOUNT(fci->object)++;
	}

	if (func->type == ZEND_USER_FUNCTION) {
		int call_via_handler = (func->common.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE) != 0;
		EG(scope) = func->common.scope;
		call->symbol_table = fci->symbol_table;
		if (UNEXPECTED(func->op_array.fn_flags & ZEND_ACC_CLOSURE)) {
			ZEND_ASSERT(GC_TYPE(func->op_array.prototype) == IS_OBJECT);
			GC_REFCOUNT(func->op_array.prototype)++;
			ZEND_ADD_CALL_FLAG(call, ZEND_CALL_CLOSURE);
		}
		if (EXPECTED((func->op_array.fn_flags & ZEND_ACC_GENERATOR) == 0)) {
			zend_init_execute_data(call, &func->op_array, fci->retval);
			zend_execute_ex(call);
		} else {
			zend_generator_create_zval(call, &func->op_array, fci->retval);
		}
		if (call_via_handler) {
			/* We must re-initialize function again */
			fci_cache->initialized = 0;
		}
	} else if (func->type == ZEND_INTERNAL_FUNCTION) {
		int call_via_handler = (func->common.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE) != 0;
		ZVAL_NULL(fci->retval);
		if (func->common.scope) {
			EG(scope) = func->common.scope;
		}
		call->prev_execute_data = EG(current_execute_data);
		call->return_value = NULL; /* this is not a constructor call */
		EG(current_execute_data) = call;
		if (EXPECTED(zend_execute_internal == NULL)) {
			/* saves one function call if zend_execute_internal is not used */
			func->internal_function.handler(call, fci->retval);
		} else {
			zend_execute_internal(call, fci->retval);
		}
		EG(current_execute_data) = call->prev_execute_data;
		zend_vm_stack_free_args(call);
		zend_vm_stack_free_call_frame(call);

		/*  We shouldn't fix bad extensions here,
			because it can break proper ones (Bug #34045)
		if (!EX(function_state).function->common.return_reference)
		{
			INIT_PZVAL(f->retval);
		}*/
		if (EG(exception)) {
			zval_ptr_dtor(fci->retval);
			ZVAL_UNDEF(fci->retval);
		}

		if (call_via_handler) {
			/* We must re-initialize function again */
			fci_cache->initialized = 0;
		}
	} else { /* ZEND_OVERLOADED_FUNCTION */
		ZVAL_NULL(fci->retval);

		/* Not sure what should be done here if it's a static method */
		if (fci->object) {
			call->prev_execute_data = EG(current_execute_data);
			EG(current_execute_data) = call;
			fci->object->handlers->call_method(func->common.function_name, fci->object, call, fci->retval);
			EG(current_execute_data) = call->prev_execute_data;
		} else {
			zend_error(E_EXCEPTION | E_ERROR, "Cannot call overloaded function for non-object");
		}

		zend_vm_stack_free_args(call);
		zend_vm_stack_free_call_frame(call);

		if (func->type == ZEND_OVERLOADED_FUNCTION_TEMPORARY) {
			zend_string_release(func->common.function_name);
		}
		efree(func);

		if (EG(exception)) {
			zval_ptr_dtor(fci->retval);
			ZVAL_UNDEF(fci->retval);
		}
	}

	if (fci->object) {
		OBJ_RELEASE(fci->object);
	}

	EG(scope) = orig_scope;
	if (EG(current_execute_data) == &dummy_execute_data) {
		EG(current_execute_data) = dummy_execute_data.prev_execute_data;
	}

	if (EG(exception)) {
		zend_throw_exception_internal(NULL);
	}
	return SUCCESS;
}
/* }}} */

ZEND_API zend_class_entry *zend_lookup_class_ex(zend_string *name, const zval *key, int use_autoload) /* {{{ */
{
	zend_class_entry *ce = NULL;
	zval args[1];
	zval local_retval;
	int retval;
	zend_string *lc_name;
	zend_fcall_info fcall_info;
	zend_fcall_info_cache fcall_cache;

	if (key) {
		lc_name = Z_STR_P(key);
	} else {
		if (name == NULL || !name->len) {
			return NULL;
		}

		if (name->val[0] == '\\') {
			lc_name = zend_string_alloc(name->len - 1, 0);
			zend_str_tolower_copy(lc_name->val, name->val + 1, name->len - 1);
		} else {
			lc_name = zend_string_tolower(name);
		}
	}

	ce = zend_hash_find_ptr(EG(class_table), lc_name);
	if (ce) {
		if (!key) {
			zend_string_release(lc_name);
		}
		return ce;
	}

	/* The compiler is not-reentrant. Make sure we __autoload() only during run-time
	 * (doesn't impact functionality of __autoload()
	*/
	if (!use_autoload || zend_is_compiling()) {
		if (!key) {
			zend_string_release(lc_name);
		}
		return NULL;
	}

	if (!EG(autoload_func)) {
		zend_function *func = zend_hash_str_find_ptr(EG(function_table), ZEND_AUTOLOAD_FUNC_NAME, sizeof(ZEND_AUTOLOAD_FUNC_NAME) - 1);
		if (func) {
			EG(autoload_func) = func;
		} else {
			if (!key) {
				zend_string_release(lc_name);
			}
			return NULL;
		}

	}

	/* Verify class name before passing it to __autoload() */
	if (strspn(name->val, "0123456789_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\177\200\201\202\203\204\205\206\207\210\211\212\213\214\215\216\217\220\221\222\223\224\225\226\227\230\231\232\233\234\235\236\237\240\241\242\243\244\245\246\247\250\251\252\253\254\255\256\257\260\261\262\263\264\265\266\267\270\271\272\273\274\275\276\277\300\301\302\303\304\305\306\307\310\311\312\313\314\315\316\317\320\321\322\323\324\325\326\327\330\331\332\333\334\335\336\337\340\341\342\343\344\345\346\347\350\351\352\353\354\355\356\357\360\361\362\363\364\365\366\367\370\371\372\373\374\375\376\377\\") != name->len) {
		if (!key) {
			zend_string_release(lc_name);
		}
		return NULL;
	}

	if (EG(in_autoload) == NULL) {
		ALLOC_HASHTABLE(EG(in_autoload));
		zend_hash_init(EG(in_autoload), 8, NULL, NULL, 0);
	}

	if (zend_hash_add_empty_element(EG(in_autoload), lc_name) == NULL) {
		if (!key) {
			zend_string_release(lc_name);
		}
		return NULL;
	}

	ZVAL_UNDEF(&local_retval);

	if (name->val[0] == '\\') {
		ZVAL_STRINGL(&args[0], name->val + 1, name->len - 1);
	} else {
		ZVAL_STR_COPY(&args[0], name);
	}

	fcall_info.size = sizeof(fcall_info);
	fcall_info.function_table = EG(function_table);
	ZVAL_STR_COPY(&fcall_info.function_name, EG(autoload_func)->common.function_name);
	fcall_info.symbol_table = NULL;
	fcall_info.retval = &local_retval;
	fcall_info.param_count = 1;
	fcall_info.params = args;
	fcall_info.object = NULL;
	fcall_info.no_separation = 1;

	fcall_cache.initialized = 1;
	fcall_cache.function_handler = EG(autoload_func);
	fcall_cache.calling_scope = NULL;
	fcall_cache.called_scope = NULL;
	fcall_cache.object = NULL;

	zend_exception_save();
	retval = zend_call_function(&fcall_info, &fcall_cache);
	zend_exception_restore();

	zval_ptr_dtor(&args[0]);
	zval_dtor(&fcall_info.function_name);

	zend_hash_del(EG(in_autoload), lc_name);

	zval_ptr_dtor(&local_retval);

	if (retval == SUCCESS) {
		ce = zend_hash_find_ptr(EG(class_table), lc_name);
	}
	if (!key) {
		zend_string_release(lc_name);
	}
	return ce;
}
/* }}} */

ZEND_API zend_class_entry *zend_lookup_class(zend_string *name) /* {{{ */
{
	return zend_lookup_class_ex(name, NULL, 1);
}
/* }}} */

ZEND_API zend_class_entry *zend_get_called_scope(zend_execute_data *ex) /* {{{ */
{
	while (ex) {
		if (ex->called_scope) {
			return ex->called_scope;
		} else if (ex->func) {
			if (ex->func->type != ZEND_INTERNAL_FUNCTION || ex->func->common.scope) {
				return ex->called_scope;
			}
		}
		ex = ex->prev_execute_data;
	}
	return NULL;
}
/* }}} */

ZEND_API zend_object *zend_get_this_object(zend_execute_data *ex) /* {{{ */
{
	while (ex) {
		if (Z_OBJ(ex->This)) {
			return Z_OBJ(ex->This);
		} else if (ex->func) {
			if (ex->func->type != ZEND_INTERNAL_FUNCTION || ex->func->common.scope) {
				return Z_OBJ(ex->This);
			}
		}
		ex = ex->prev_execute_data;
	}
	return NULL;
}
/* }}} */

ZEND_API int zend_eval_stringl(char *str, size_t str_len, zval *retval_ptr, char *string_name) /* {{{ */
{
	zval pv;
	zend_op_array *new_op_array;
	uint32_t original_compiler_options;
	int retval;

	if (retval_ptr) {
		ZVAL_NEW_STR(&pv, zend_string_alloc(str_len + sizeof("return ;")-1, 1));
		memcpy(Z_STRVAL(pv), "return ", sizeof("return ") - 1);
		memcpy(Z_STRVAL(pv) + sizeof("return ") - 1, str, str_len);
		Z_STRVAL(pv)[Z_STRLEN(pv) - 1] = ';';
		Z_STRVAL(pv)[Z_STRLEN(pv)] = '\0';
	} else {
		ZVAL_STRINGL(&pv, str, str_len);
	}

	/*printf("Evaluating '%s'\n", pv.value.str.val);*/

	original_compiler_options = CG(compiler_options);
	CG(compiler_options) = ZEND_COMPILE_DEFAULT_FOR_EVAL;
	new_op_array = zend_compile_string(&pv, string_name);
	CG(compiler_options) = original_compiler_options;

	if (new_op_array) {
		zval local_retval;

		EG(no_extensions)=1;

		zend_try {
			ZVAL_UNDEF(&local_retval);
			zend_execute(new_op_array, &local_retval);
		} zend_catch {
			destroy_op_array(new_op_array);
			efree_size(new_op_array, sizeof(zend_op_array));
			zend_bailout();
		} zend_end_try();

		if (Z_TYPE(local_retval) != IS_UNDEF) {
			if (retval_ptr) {
				ZVAL_COPY_VALUE(retval_ptr, &local_retval);
			} else {
				zval_ptr_dtor(&local_retval);
			}
		} else {
			if (retval_ptr) {
				ZVAL_NULL(retval_ptr);
			}
		}

		EG(no_extensions)=0;
		destroy_op_array(new_op_array);
		efree_size(new_op_array, sizeof(zend_op_array));
		retval = SUCCESS;
	} else {
		retval = FAILURE;
	}
	zval_dtor(&pv);
	return retval;
}
/* }}} */

ZEND_API int zend_eval_string(char *str, zval *retval_ptr, char *string_name) /* {{{ */
{
	return zend_eval_stringl(str, strlen(str), retval_ptr, string_name);
}
/* }}} */

ZEND_API int zend_eval_stringl_ex(char *str, size_t str_len, zval *retval_ptr, char *string_name, int handle_exceptions) /* {{{ */
{
	int result;

	result = zend_eval_stringl(str, str_len, retval_ptr, string_name);
	if (handle_exceptions && EG(exception)) {
		zend_exception_error(EG(exception), E_ERROR);
		result = FAILURE;
	}
	return result;
}
/* }}} */

ZEND_API int zend_eval_string_ex(char *str, zval *retval_ptr, char *string_name, int handle_exceptions) /* {{{ */
{
	return zend_eval_stringl_ex(str, strlen(str), retval_ptr, string_name, handle_exceptions);
}
/* }}} */

ZEND_API void zend_timeout(int dummy) /* {{{ */
{

	if (zend_on_timeout) {
#ifdef ZEND_SIGNALS
		/*
		   We got here because we got a timeout signal, so we are in a signal handler
		   at this point. However, we want to be able to timeout any user-supplied
		   shutdown functions, so pretend we are not in a signal handler while we are
		   calling these
		*/
		SIGG(running) = 0;
#endif
		zend_on_timeout(EG(timeout_seconds));
	}

	zend_error_noreturn(E_ERROR, "Maximum execution time of %pd second%s exceeded", EG(timeout_seconds), EG(timeout_seconds) == 1 ? "" : "s");
}
/* }}} */

#ifdef ZEND_WIN32
VOID CALLBACK tq_timer_cb(PVOID arg, BOOLEAN timed_out)
{
	zend_bool *php_timed_out;

	/* The doc states it'll be always true, however it theoretically
		could be FALSE when the thread was signaled. */
	if (!timed_out) {
		return;
	}

	php_timed_out = (zend_bool *)arg;
	*php_timed_out = 1;
}
#endif

/* This one doesn't exists on QNX */
#ifndef SIGPROF
#define SIGPROF 27
#endif

void zend_set_timeout(zend_long seconds, int reset_signals) /* {{{ */
{

	EG(timeout_seconds) = seconds;

#ifdef ZEND_WIN32
	if(!seconds) {
		return;
	}

        /* Don't use ChangeTimerQueueTimer() as it will not restart an expired
		timer, so we could end up with just an ignored timeout. Instead
		delete and recreate. */
	if (NULL != tq_timer) {
		if (!DeleteTimerQueueTimer(NULL, tq_timer, NULL)) {
			EG(timed_out) = 0;
			tq_timer = NULL;
			zend_error_noreturn(E_ERROR, "Could not delete queued timer");
			return;
		}
		tq_timer = NULL;
	}

	/* XXX passing NULL means the default timer queue provided by the system is used */
	if (!CreateTimerQueueTimer(&tq_timer, NULL, (WAITORTIMERCALLBACK)tq_timer_cb, (VOID*)&EG(timed_out), seconds*1000, 0, WT_EXECUTEONLYONCE)) {
		EG(timed_out) = 0;
		tq_timer = NULL;
		zend_error_noreturn(E_ERROR, "Could not queue new timer");
		return;
	}
	EG(timed_out) = 0;
#else
#	ifdef HAVE_SETITIMER
	{
		struct itimerval t_r;		/* timeout requested */
		int signo;

		if(seconds) {
			t_r.it_value.tv_sec = seconds;
			t_r.it_value.tv_usec = t_r.it_interval.tv_sec = t_r.it_interval.tv_usec = 0;

#	ifdef __CYGWIN__
			setitimer(ITIMER_REAL, &t_r, NULL);
		}
		signo = SIGALRM;
#	else
			setitimer(ITIMER_PROF, &t_r, NULL);
		}
		signo = SIGPROF;
#	endif

		if (reset_signals) {
#	ifdef ZEND_SIGNALS
			zend_signal(signo, zend_timeout);
#	else
			sigset_t sigset;

			signal(signo, zend_timeout);
			sigemptyset(&sigset);
			sigaddset(&sigset, signo);
			sigprocmask(SIG_UNBLOCK, &sigset, NULL);
#	endif
		}
	}
#	endif /* HAVE_SETITIMER */
#endif
}
/* }}} */

void zend_unset_timeout(void) /* {{{ */
{
#ifdef ZEND_WIN32
	if (NULL != tq_timer) {
		if (!DeleteTimerQueueTimer(NULL, tq_timer, NULL)) {
			EG(timed_out) = 0;
			tq_timer = NULL;
			zend_error_noreturn(E_ERROR, "Could not delete queued timer");
			return;
		}
		tq_timer = NULL;
	}
	EG(timed_out) = 0;
#else
#	ifdef HAVE_SETITIMER
	if (EG(timeout_seconds)) {
		struct itimerval no_timeout;

		no_timeout.it_value.tv_sec = no_timeout.it_value.tv_usec = no_timeout.it_interval.tv_sec = no_timeout.it_interval.tv_usec = 0;

#ifdef __CYGWIN__
		setitimer(ITIMER_REAL, &no_timeout, NULL);
#else
		setitimer(ITIMER_PROF, &no_timeout, NULL);
#endif
	}
#	endif
#endif
}
/* }}} */

zend_class_entry *zend_fetch_class(zend_string *class_name, int fetch_type) /* {{{ */
{
	zend_class_entry *ce;
	int fetch_sub_type = fetch_type & ZEND_FETCH_CLASS_MASK;

check_fetch_type:
	switch (fetch_sub_type) {
		case ZEND_FETCH_CLASS_SELF:
			if (UNEXPECTED(!EG(scope))) {
				int error_type = (fetch_type & ZEND_FETCH_CLASS_EXCEPTION) ?
						(E_EXCEPTION | E_ERROR) : E_ERROR;
				zend_error(error_type, "Cannot access self:: when no class scope is active");
			}
			return EG(scope);
		case ZEND_FETCH_CLASS_PARENT:
			if (UNEXPECTED(!EG(scope))) {
				int error_type = (fetch_type & ZEND_FETCH_CLASS_EXCEPTION) ?
						(E_EXCEPTION | E_ERROR) : E_ERROR;
				zend_error(error_type, "Cannot access parent:: when no class scope is active");
				return NULL;
			}
			if (UNEXPECTED(!EG(scope)->parent)) {
				int error_type = (fetch_type & ZEND_FETCH_CLASS_EXCEPTION) ?
						(E_EXCEPTION | E_ERROR) : E_ERROR;
				zend_error(error_type, "Cannot access parent:: when current class scope has no parent");
			}
			return EG(scope)->parent;
		case ZEND_FETCH_CLASS_STATIC:
			ce = zend_get_called_scope(EG(current_execute_data));
			if (UNEXPECTED(!ce)) {
				int error_type = (fetch_type & ZEND_FETCH_CLASS_EXCEPTION) ?
						(E_EXCEPTION | E_ERROR) : E_ERROR;
				zend_error(error_type, "Cannot access static:: when no class scope is active");
				return NULL;
			}
			return ce;
		case ZEND_FETCH_CLASS_AUTO: {
				fetch_sub_type = zend_get_class_fetch_type(class_name);
				if (UNEXPECTED(fetch_sub_type != ZEND_FETCH_CLASS_DEFAULT)) {
					goto check_fetch_type;
				}
			}
			break;
	}

	if (fetch_type & ZEND_FETCH_CLASS_NO_AUTOLOAD) {
		return zend_lookup_class_ex(class_name, NULL, 0);
	} else if ((ce = zend_lookup_class_ex(class_name, NULL, 1)) == NULL) {
		if (!(fetch_type & ZEND_FETCH_CLASS_SILENT) && !EG(exception)) {
			int error_type = (fetch_type & ZEND_FETCH_CLASS_EXCEPTION) ?
						(E_EXCEPTION | E_ERROR) : E_ERROR;
			if (fetch_sub_type == ZEND_FETCH_CLASS_INTERFACE) {
				zend_error(error_type, "Interface '%s' not found", class_name->val);
			} else if (fetch_sub_type == ZEND_FETCH_CLASS_TRAIT) {
				zend_error(error_type, "Trait '%s' not found", class_name->val);
			} else {
				zend_error(error_type, "Class '%s' not found", class_name->val);
			}
		}
		return NULL;
	}
	return ce;
}
/* }}} */

zend_class_entry *zend_fetch_class_by_name(zend_string *class_name, const zval *key, int fetch_type) /* {{{ */
{
	zend_class_entry *ce;

	if (fetch_type & ZEND_FETCH_CLASS_NO_AUTOLOAD) {
		return zend_lookup_class_ex(class_name, key, 0);
	} else if ((ce = zend_lookup_class_ex(class_name, key, 1)) == NULL) {
		if ((fetch_type & ZEND_FETCH_CLASS_SILENT) == 0 && !EG(exception)) {
			int error_type = (fetch_type & ZEND_FETCH_CLASS_EXCEPTION) ?
							(E_EXCEPTION | E_ERROR) : E_ERROR;
			if ((fetch_type & ZEND_FETCH_CLASS_MASK) == ZEND_FETCH_CLASS_INTERFACE) {
				zend_error(error_type, "Interface '%s' not found", class_name->val);
			} else if ((fetch_type & ZEND_FETCH_CLASS_MASK) == ZEND_FETCH_CLASS_TRAIT) {
				zend_error(error_type, "Trait '%s' not found", class_name->val);
			} else {
				zend_error(error_type, "Class '%s' not found", class_name->val);
			}
		}
		return NULL;
	}
	return ce;
}
/* }}} */

#define MAX_ABSTRACT_INFO_CNT 3
#define MAX_ABSTRACT_INFO_FMT "%s%s%s%s"
#define DISPLAY_ABSTRACT_FN(idx) \
	ai.afn[idx] ? ZEND_FN_SCOPE_NAME(ai.afn[idx]) : "", \
	ai.afn[idx] ? "::" : "", \
	ai.afn[idx] ? ai.afn[idx]->common.function_name->val : "", \
	ai.afn[idx] && ai.afn[idx + 1] ? ", " : (ai.afn[idx] && ai.cnt > MAX_ABSTRACT_INFO_CNT ? ", ..." : "")

typedef struct _zend_abstract_info {
	zend_function *afn[MAX_ABSTRACT_INFO_CNT + 1];
	int cnt;
	int ctor;
} zend_abstract_info;

static void zend_verify_abstract_class_function(zend_function *fn, zend_abstract_info *ai) /* {{{ */
{
	if (fn->common.fn_flags & ZEND_ACC_ABSTRACT) {
		if (ai->cnt < MAX_ABSTRACT_INFO_CNT) {
			ai->afn[ai->cnt] = fn;
		}
		if (fn->common.fn_flags & ZEND_ACC_CTOR) {
			if (!ai->ctor) {
				ai->cnt++;
				ai->ctor = 1;
			} else {
				ai->afn[ai->cnt] = NULL;
			}
		} else {
			ai->cnt++;
		}
	}
}
/* }}} */

void zend_verify_abstract_class(zend_class_entry *ce) /* {{{ */
{
	zend_function *func;
	zend_abstract_info ai;

	if ((ce->ce_flags & ZEND_ACC_IMPLICIT_ABSTRACT_CLASS) && !(ce->ce_flags & (ZEND_ACC_TRAIT | ZEND_ACC_EXPLICIT_ABSTRACT_CLASS))) {
		memset(&ai, 0, sizeof(ai));

		ZEND_HASH_FOREACH_PTR(&ce->function_table, func) {
			zend_verify_abstract_class_function(func, &ai);
		} ZEND_HASH_FOREACH_END();

		if (ai.cnt) {
			zend_error_noreturn(E_ERROR, "Class %s contains %d abstract method%s and must therefore be declared abstract or implement the remaining methods (" MAX_ABSTRACT_INFO_FMT MAX_ABSTRACT_INFO_FMT MAX_ABSTRACT_INFO_FMT ")",
				ce->name->val, ai.cnt,
				ai.cnt > 1 ? "s" : "",
				DISPLAY_ABSTRACT_FN(0),
				DISPLAY_ABSTRACT_FN(1),
				DISPLAY_ABSTRACT_FN(2)
				);
		}
	}
}
/* }}} */

ZEND_API int zend_delete_global_variable(zend_string *name) /* {{{ */
{
    return zend_hash_del_ind(&EG(symbol_table), name);
}
/* }}} */

ZEND_API zend_array *zend_rebuild_symbol_table(void) /* {{{ */
{
	int i;
	zend_execute_data *ex;
	zend_array *symbol_table;

	/* Search for last called user function */
	ex = EG(current_execute_data);
	while (ex && (!ex->func || !ZEND_USER_CODE(ex->func->common.type))) {
		ex = ex->prev_execute_data;
	}
	if (!ex) {
		return NULL;
	}
	if (ex->symbol_table) {
		return ex->symbol_table;
	}

	if (EG(symtable_cache_ptr) >= EG(symtable_cache)) {
		/*printf("Cache hit!  Reusing %x\n", symtable_cache[symtable_cache_ptr]);*/
		symbol_table = ex->symbol_table = *(EG(symtable_cache_ptr)--);
		if (!ex->func->op_array.last_var) {
			return symbol_table;
		}
		zend_hash_extend(symbol_table, ex->func->op_array.last_var, 0);
	} else {
		symbol_table = ex->symbol_table = emalloc(sizeof(zend_array));
		zend_hash_init(symbol_table, ex->func->op_array.last_var, NULL, ZVAL_PTR_DTOR, 0);
		if (!ex->func->op_array.last_var) {
			return symbol_table;
		}
		zend_hash_real_init(symbol_table, 0);
		/*printf("Cache miss!  Initialized %x\n", EG(active_symbol_table));*/
	}
	for (i = 0; i < ex->func->op_array.last_var; i++) {
		_zend_hash_append_ind(symbol_table, ex->func->op_array.vars[i],
			ZEND_CALL_VAR_NUM(ex, i));
	}
	return symbol_table;
}
/* }}} */

ZEND_API void zend_attach_symbol_table(zend_execute_data *execute_data) /* {{{ */
{
	int i;
	zend_op_array *op_array = &execute_data->func->op_array;
	HashTable *ht = execute_data->symbol_table;

	/* copy real values from symbol table into CV slots and create
	   INDIRECT references to CV in symbol table  */
	for (i = 0; i < op_array->last_var; i++) {
		zval *zv = zend_hash_find(ht, op_array->vars[i]);

		if (zv) {
			if (Z_TYPE_P(zv) == IS_INDIRECT) {
				zval *val = Z_INDIRECT_P(zv);

				ZVAL_COPY_VALUE(EX_VAR_NUM(i), val);
			} else {
				ZVAL_COPY_VALUE(EX_VAR_NUM(i), zv);
			}
		} else {
			ZVAL_UNDEF(EX_VAR_NUM(i));
			zv = zend_hash_add_new(ht, op_array->vars[i], EX_VAR_NUM(i));
		}
		ZVAL_INDIRECT(zv, EX_VAR_NUM(i));
	}
}
/* }}} */

ZEND_API void zend_detach_symbol_table(zend_execute_data *execute_data) /* {{{ */
{
	int i;
	zend_op_array *op_array = &execute_data->func->op_array;
	HashTable *ht = execute_data->symbol_table;

	/* copy real values from CV slots into symbol table */
	for (i = 0; i < op_array->last_var; i++) {
		if (Z_TYPE_P(EX_VAR_NUM(i)) == IS_UNDEF) {
			zend_hash_del(ht, op_array->vars[i]);
		} else {
			zend_hash_update(ht, op_array->vars[i], EX_VAR_NUM(i));
			ZVAL_UNDEF(EX_VAR_NUM(i));
		}
	}
}
/* }}} */

ZEND_API int zend_set_local_var(zend_string *name, zval *value, int force) /* {{{ */
{
	zend_execute_data *execute_data = EG(current_execute_data);

	while (execute_data && (!execute_data->func || !ZEND_USER_CODE(execute_data->func->common.type))) {
		execute_data = execute_data->prev_execute_data;
	}

	if (execute_data) {
		if (!execute_data->symbol_table) {
			zend_ulong h = zend_string_hash_val(name);
			zend_op_array *op_array = &execute_data->func->op_array;
			int i;

			for (i = 0; i < op_array->last_var; i++) {
				if (op_array->vars[i]->h == h &&
				    op_array->vars[i]->len == name->len &&
				    memcmp(op_array->vars[i]->val, name->val, name->len) == 0) {
					ZVAL_COPY_VALUE(EX_VAR_NUM(i), value);
					return SUCCESS;
				}
			}
			if (force) {
				zend_array *symbol_table = zend_rebuild_symbol_table();
				if (symbol_table) {
					return zend_hash_update(symbol_table, name, value) ? SUCCESS : FAILURE;;
				}
			}
		} else {
			return (zend_hash_update_ind(execute_data->symbol_table, name, value) != NULL) ? SUCCESS : FAILURE;
		}
	}
	return FAILURE;
}
/* }}} */

ZEND_API int zend_set_local_var_str(const char *name, size_t len, zval *value, int force) /* {{{ */
{
	zend_execute_data *execute_data = EG(current_execute_data);

	while (execute_data && (!execute_data->func || !ZEND_USER_CODE(execute_data->func->common.type))) {
		execute_data = execute_data->prev_execute_data;
	}

	if (execute_data) {
		if (!execute_data->symbol_table) {
			zend_ulong h = zend_hash_func(name, len);
			zend_op_array *op_array = &execute_data->func->op_array;
			int i;

			for (i = 0; i < op_array->last_var; i++) {
				if (op_array->vars[i]->h == h &&
				    op_array->vars[i]->len == len &&
				    memcmp(op_array->vars[i]->val, name, len) == 0) {
					zval_ptr_dtor(EX_VAR_NUM(i));
					ZVAL_COPY_VALUE(EX_VAR_NUM(i), value);
					return SUCCESS;
				}
			}

			if (force) {
				zend_array *symbol_table = zend_rebuild_symbol_table();
				if (symbol_table) {
					return zend_hash_str_update(symbol_table, name, len, value) ? SUCCESS : FAILURE;;
				}
			}
		} else {
			return (zend_hash_str_update_ind(execute_data->symbol_table, name, len, value) != NULL) ? SUCCESS : FAILURE;
		}
	}
	return FAILURE;
}
/* }}} */

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * indent-tabs-mode: t
 * End:
 */