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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2012 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: Christian Seiler <chris_se@gmx.net> |
| Dmitry Stogov <dmitry@zend.com> |
| Marcus Boerger <helly@php.net> |
+----------------------------------------------------------------------+
*/

/* $Id$ */

#include "zend.h"
#include "zend_API.h"
#include "zend_closures.h"
#include "zend_exceptions.h"
#include "zend_interfaces.h"
#include "zend_objects.h"
#include "zend_objects_API.h"
#include "zend_globals.h"

#define ZEND_CLOSURE_PRINT_NAME "Closure object"

#define ZEND_CLOSURE_PROPERTY_ERROR() \
zend_error(E_RECOVERABLE_ERROR, "Closure object cannot have properties")

typedef struct _zend_closure {
zend_object std;
zend_function func;
zval *this_ptr;
HashTable *debug_info;
} zend_closure;

/* non-static since it needs to be referenced */
ZEND_API zend_class_entry *zend_ce_closure;
static zend_object_handlers closure_handlers;

ZEND_METHOD(Closure, __invoke) /* {{{ */
{
zend_function *func = EG(current_execute_data)->function_state.function;
zval ***arguments;
zval *closure_result_ptr = NULL;

arguments = emalloc(sizeof(zval**) * ZEND_NUM_ARGS());
if (zend_get_parameters_array_ex(ZEND_NUM_ARGS(), arguments) == FAILURE) {
efree(arguments);
zend_error(E_RECOVERABLE_ERROR, "Cannot get arguments for calling closure");
RETVAL_FALSE;
} else if (call_user_function_ex(CG(function_table), NULL, this_ptr, &closure_result_ptr, ZEND_NUM_ARGS(), arguments, 1, NULL TSRMLS_CC) == FAILURE) {
RETVAL_FALSE;
} else if (closure_result_ptr) {
if (Z_ISREF_P(closure_result_ptr) && return_value_ptr) {
if (return_value) {
zval_ptr_dtor(&return_value);
}
*return_value_ptr = closure_result_ptr;
} else {
RETVAL_ZVAL(closure_result_ptr, 1, 1);
}
}
efree(arguments);

/* destruct the function also, then - we have allocated it in get_method */
efree((char*)func->internal_function.function_name);
efree(func);
}
/* }}} */

/* {{{ proto Closure Closure::bind(Closure $old, object $to [, mixed $scope = "static" ] )
Create a closure from another one and bind to another object and scope */
ZEND_METHOD(Closure, bind) /* {{{ */
{
zval *newthis, *zclosure, *scope_arg = NULL;
zend_closure *closure;
zend_class_entry *ce, **ce_p;

if (zend_parse_method_parameters(ZEND_NUM_ARGS() TSRMLS_CC, getThis(), "Oo!|z", &zclosure, zend_ce_closure, &newthis, &scope_arg) == FAILURE) {
RETURN_NULL();
}

closure = (zend_closure *)zend_object_store_get_object(zclosure TSRMLS_CC);

if ((newthis != NULL) && (closure->func.common.fn_flags & ZEND_ACC_STATIC)) {
zend_error(E_WARNING, "Cannot bind an instance to a static closure");
}

if (scope_arg != NULL) { /* scope argument was given */
if (IS_ZEND_STD_OBJECT(*scope_arg)) {
ce = Z_OBJCE_P(scope_arg);
} else if (Z_TYPE_P(scope_arg) == IS_NULL) {
ce = NULL;
} else {
char *class_name;
int class_name_len;
zval tmp_zval;
INIT_ZVAL(tmp_zval);

if (Z_TYPE_P(scope_arg) == IS_STRING) {
class_name = Z_STRVAL_P(scope_arg);
class_name_len = Z_STRLEN_P(scope_arg);
} else {
tmp_zval = *scope_arg;
zval_copy_ctor(&tmp_zval);
convert_to_string(&tmp_zval);
class_name = Z_STRVAL(tmp_zval);
class_name_len = Z_STRLEN(tmp_zval);
}

if ((class_name_len == sizeof("static") - 1) &&
(memcmp("static", class_name, sizeof("static") - 1) == 0)) {
ce = closure->func.common.scope;
}
else if (zend_lookup_class_ex(class_name, class_name_len, NULL, 1, &ce_p TSRMLS_CC) == FAILURE) {
zend_error(E_WARNING, "Class '%s' not found", class_name);
zval_dtor(&tmp_zval);
RETURN_NULL();
} else {
ce = *ce_p;
}
zval_dtor(&tmp_zval);
}
} else { /* scope argument not given; do not change the scope by default */
ce = closure->func.common.scope;
}

zend_create_closure(return_value, &closure->func, ce, newthis TSRMLS_CC);
}
/* }}} */

static zend_function *zend_closure_get_constructor(zval *object TSRMLS_DC) /* {{{ */
{
zend_error(E_RECOVERABLE_ERROR, "Instantiation of 'Closure' is not allowed");
return NULL;
}
/* }}} */

static int zend_closure_compare_objects(zval *o1, zval *o2 TSRMLS_DC) /* {{{ */
{
return (Z_OBJ_HANDLE_P(o1) != Z_OBJ_HANDLE_P(o2));
}
/* }}} */

ZEND_API zend_function *zend_get_closure_invoke_method(zval *obj TSRMLS_DC) /* {{{ */
{
zend_closure *closure = (zend_closure *)zend_object_store_get_object(obj TSRMLS_CC);
zend_function *invoke = (zend_function*)emalloc(sizeof(zend_function));

invoke->common = closure->func.common;
invoke->type = ZEND_INTERNAL_FUNCTION;
invoke->internal_function.fn_flags = ZEND_ACC_PUBLIC | ZEND_ACC_CALL_VIA_HANDLER | (closure->func.common.fn_flags & ZEND_ACC_RETURN_REFERENCE);
invoke->internal_function.handler = ZEND_MN(Closure___invoke);
invoke->internal_function.module = 0;
invoke->internal_function.scope = zend_ce_closure;
invoke->internal_function.function_name = estrndup(ZEND_INVOKE_FUNC_NAME, sizeof(ZEND_INVOKE_FUNC_NAME)-1);
return invoke;
}
/* }}} */

ZEND_API const zend_function *zend_get_closure_method_def(zval *obj TSRMLS_DC) /* {{{ */
{
zend_closure *closure = (zend_closure *)zend_object_store_get_object(obj TSRMLS_CC);
return &closure->func;
}
/* }}} */

ZEND_API zval* zend_get_closure_this_ptr(zval *obj TSRMLS_DC) /* {{{ */
{
zend_closure *closure = (zend_closure *)zend_object_store_get_object(obj TSRMLS_CC);
return closure->this_ptr;
}
/* }}} */

static zend_function *zend_closure_get_method(zval **object_ptr, char *method_name, int method_len, const zend_literal *key TSRMLS_DC) /* {{{ */
{
char *lc_name;
ALLOCA_FLAG(use_heap)

lc_name = do_alloca(method_len + 1, use_heap);
zend_str_tolower_copy(lc_name, method_name, method_len);
if ((method_len == sizeof(ZEND_INVOKE_FUNC_NAME)-1) &&
memcmp(lc_name, ZEND_INVOKE_FUNC_NAME, sizeof(ZEND_INVOKE_FUNC_NAME)-1) == 0
) {
free_alloca(lc_name, use_heap);
return zend_get_closure_invoke_method(*object_ptr TSRMLS_CC);
}
free_alloca(lc_name, use_heap);
return std_object_handlers.get_method(object_ptr, method_name, method_len, key TSRMLS_CC);
}
/* }}} */

static zval *zend_closure_read_property(zval *object, zval *member, int type, const zend_literal *key TSRMLS_DC) /* {{{ */
{
ZEND_CLOSURE_PROPERTY_ERROR();
Z_ADDREF(EG(uninitialized_zval));
return &EG(uninitialized_zval);
}
/* }}} */

static void zend_closure_write_property(zval *object, zval *member, zval *value, const zend_literal *key TSRMLS_DC) /* {{{ */
{
ZEND_CLOSURE_PROPERTY_ERROR();
}
/* }}} */

static zval **zend_closure_get_property_ptr_ptr(zval *object, zval *member, const zend_literal *key TSRMLS_DC) /* {{{ */
{
ZEND_CLOSURE_PROPERTY_ERROR();
return NULL;
}
/* }}} */

static int zend_closure_has_property(zval *object, zval *member, int has_set_exists, const zend_literal *key TSRMLS_DC) /* {{{ */
{
if (has_set_exists != 2) {
ZEND_CLOSURE_PROPERTY_ERROR();
}
return 0;
}
/* }}} */

static void zend_closure_unset_property(zval *object, zval *member, const zend_literal *key TSRMLS_DC) /* {{{ */
{
ZEND_CLOSURE_PROPERTY_ERROR();
}
/* }}} */

static void zend_closure_free_storage(void *object TSRMLS_DC) /* {{{ */
{
zend_closure *closure = (zend_closure *)object;

zend_object_std_dtor(&closure->std TSRMLS_CC);

if (closure->func.type == ZEND_USER_FUNCTION) {
zend_execute_data *ex = EG(current_execute_data);
while (ex) {
if (ex->op_array == &closure->func.op_array) {
zend_error(E_ERROR, "Cannot destroy active lambda function");
}
ex = ex->prev_execute_data;
}
destroy_op_array(&closure->func.op_array TSRMLS_CC);
}

if (closure->debug_info != NULL) {
zend_hash_destroy(closure->debug_info);
efree(closure->debug_info);
}

if (closure->this_ptr) {
zval_ptr_dtor(&closure->this_ptr);
}

efree(closure);
}
/* }}} */

static zend_object_value zend_closure_new(zend_class_entry *class_type TSRMLS_DC) /* {{{ */
{
zend_closure *closure;
zend_object_value object;

closure = emalloc(sizeof(zend_closure));
memset(closure, 0, sizeof(zend_closure));

zend_object_std_init(&closure->std, class_type TSRMLS_CC);

object.handle = zend_objects_store_put(closure, (zend_objects_store_dtor_t)zend_objects_destroy_object, (zend_objects_free_object_storage_t) zend_closure_free_storage, NULL TSRMLS_CC);
object.handlers = &closure_handlers;

return object;
}
/* }}} */

static zend_object_value zend_closure_clone(zval *zobject TSRMLS_DC) /* {{{ */
{
zend_closure *closure = (zend_closure *)zend_object_store_get_object(zobject TSRMLS_CC);
zval result;

zend_create_closure(&result, &closure->func, closure->func.common.scope, closure->this_ptr TSRMLS_CC);
return Z_OBJVAL(result);
}
/* }}} */


int zend_closure_get_closure(zval *obj, zend_class_entry **ce_ptr, zend_function **fptr_ptr, zval **zobj_ptr TSRMLS_DC) /* {{{ */
{
zend_closure *closure;

if (Z_TYPE_P(obj) != IS_OBJECT) {
return FAILURE;
}

closure = (zend_closure *)zend_object_store_get_object(obj TSRMLS_CC);
*fptr_ptr = &closure->func;

if (closure->this_ptr) {
if (zobj_ptr) {
*zobj_ptr = closure->this_ptr;
}
*ce_ptr = Z_OBJCE_P(closure->this_ptr);
} else {
if (zobj_ptr) {
*zobj_ptr = NULL;
}
*ce_ptr = closure->func.common.scope;
}
return SUCCESS;
}
/* }}} */

static HashTable *zend_closure_get_debug_info(zval *object, int *is_temp TSRMLS_DC) /* {{{ */
{
zend_closure *closure = (zend_closure *)zend_object_store_get_object(object TSRMLS_CC);
zval *val;
struct _zend_arg_info *arg_info = closure->func.common.arg_info;

*is_temp = 0;

if (closure->debug_info == NULL) {
ALLOC_HASHTABLE(closure->debug_info);
zend_hash_init(closure->debug_info, 1, NULL, ZVAL_PTR_DTOR, 0);
}
if (closure->debug_info->nApplyCount == 0) {
if (closure->func.type == ZEND_USER_FUNCTION && closure->func.op_array.static_variables) {
HashTable *static_variables = closure->func.op_array.static_variables;
MAKE_STD_ZVAL(val);
array_init(val);
zend_hash_copy(Z_ARRVAL_P(val), static_variables, (copy_ctor_func_t)zval_add_ref, NULL, sizeof(zval*));
zend_hash_update(closure->debug_info, "static", sizeof("static"), (void *) &val, sizeof(zval *), NULL);
}

if (closure->this_ptr) {
Z_ADDREF_P(closure->this_ptr);
zend_symtable_update(closure->debug_info, "this", sizeof("this"), (void *) &closure->this_ptr, sizeof(zval *), NULL);
}

if (arg_info) {
zend_uint i, required = closure->func.common.required_num_args;

MAKE_STD_ZVAL(val);
array_init(val);

for (i = 0; i < closure->func.common.num_args; i++) {
char *name, *info;
int name_len, info_len;
if (arg_info->name) {
name_len = zend_spprintf(&name, 0, "%s$%s",
arg_info->pass_by_reference ? "&" : "",
arg_info->name);
} else {
name_len = zend_spprintf(&name, 0, "%s$param%d",
arg_info->pass_by_reference ? "&" : "",
i + 1);
}
info_len = zend_spprintf(&info, 0, "%s",
i >= required ? "<optional>" : "<required>");
add_assoc_stringl_ex(val, name, name_len + 1, info, info_len, 0);
efree(name);
arg_info++;
}
zend_hash_update(closure->debug_info, "parameter", sizeof("parameter"), (void *) &val, sizeof(zval *), NULL);
}
}

return closure->debug_info;
}
/* }}} */

static HashTable *zend_closure_get_gc(zval *obj, zval ***table, int *n TSRMLS_DC) /* {{{ */
{
zend_closure *closure = (zend_closure *)zend_object_store_get_object(obj TSRMLS_CC);

*table = closure->this_ptr ? &closure->this_ptr : NULL;
*n = closure->this_ptr ? 1 : 0;
return (closure->func.type == ZEND_USER_FUNCTION) ?
closure->func.op_array.static_variables : NULL;
}
/* }}} */

/* {{{ proto Closure::__construct()
Private constructor preventing instantiation */
ZEND_METHOD(Closure, __construct)
{
zend_error(E_RECOVERABLE_ERROR, "Instantiation of 'Closure' is not allowed");
}
/* }}} */

ZEND_BEGIN_ARG_INFO_EX(arginfo_closure_bindto, 0, 0, 1)
ZEND_ARG_INFO(0, newthis)
ZEND_ARG_INFO(0, newscope)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_closure_bind, 0, 0, 2)
ZEND_ARG_INFO(0, closure)
ZEND_ARG_INFO(0, newthis)
ZEND_ARG_INFO(0, newscope)
ZEND_END_ARG_INFO()

static const zend_function_entry closure_functions[] = {
ZEND_ME(Closure, __construct, NULL, ZEND_ACC_PRIVATE)
ZEND_ME(Closure, bind, arginfo_closure_bind, ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
ZEND_MALIAS(Closure, bindTo, bind, arginfo_closure_bindto, ZEND_ACC_PUBLIC)
{NULL, NULL, NULL}
};

void zend_register_closure_ce(TSRMLS_D) /* {{{ */
{
zend_class_entry ce;

INIT_CLASS_ENTRY(ce, "Closure", closure_functions);
zend_ce_closure = zend_register_internal_class(&ce TSRMLS_CC);
zend_ce_closure->ce_flags |= ZEND_ACC_FINAL_CLASS;
zend_ce_closure->create_object = zend_closure_new;
zend_ce_closure->serialize = zend_class_serialize_deny;
zend_ce_closure->unserialize = zend_class_unserialize_deny;

memcpy(&closure_handlers, zend_get_std_object_handlers(), sizeof(zend_object_handlers));
closure_handlers.get_constructor = zend_closure_get_constructor;
closure_handlers.get_method = zend_closure_get_method;
closure_handlers.write_property = zend_closure_write_property;
closure_handlers.read_property = zend_closure_read_property;
closure_handlers.get_property_ptr_ptr = zend_closure_get_property_ptr_ptr;
closure_handlers.has_property = zend_closure_has_property;
closure_handlers.unset_property = zend_closure_unset_property;
closure_handlers.compare_objects = zend_closure_compare_objects;
closure_handlers.clone_obj = zend_closure_clone;
closure_handlers.get_debug_info = zend_closure_get_debug_info;
closure_handlers.get_closure = zend_closure_get_closure;
closure_handlers.get_gc = zend_closure_get_gc;
}
/* }}} */

ZEND_API void zend_create_closure(zval *res, zend_function *func, zend_class_entry *scope, zval *this_ptr TSRMLS_DC) /* {{{ */
{
zend_closure *closure;

object_init_ex(res, zend_ce_closure);

closure = (zend_closure *)zend_object_store_get_object(res TSRMLS_CC);

closure->func = *func;
closure->func.common.prototype = NULL;

if ((scope == NULL) && (this_ptr != NULL)) {
/* use dummy scope if we're binding an object without specifying a scope */
/* maybe it would be better to create one for this purpose */
scope = zend_ce_closure;
}

if (closure->func.type == ZEND_USER_FUNCTION) {
if (closure->func.op_array.static_variables) {
HashTable *static_variables = closure->func.op_array.static_variables;

ALLOC_HASHTABLE(closure->func.op_array.static_variables);
zend_hash_init(closure->func.op_array.static_variables, zend_hash_num_elements(static_variables), NULL, ZVAL_PTR_DTOR, 0);
zend_hash_apply_with_arguments(static_variables TSRMLS_CC, (apply_func_args_t)zval_copy_static_var, 1, closure->func.op_array.static_variables);
}
closure->func.op_array.run_time_cache = NULL;
(*closure->func.op_array.refcount)++;
} else {
/* verify that we aren't binding internal function to a wrong scope */
if(func->common.scope != NULL) {
if(scope && !instanceof_function(scope, func->common.scope TSRMLS_CC)) {
zend_error(E_WARNING, "Cannot bind function %s::%s to scope class %s", func->common.scope->name, func->common.function_name, scope->name);
scope = NULL;
}
if(scope && this_ptr && (func->common.fn_flags & ZEND_ACC_STATIC) == 0 &&
!instanceof_function(Z_OBJCE_P(this_ptr), closure->func.common.scope TSRMLS_CC)) {
zend_error(E_WARNING, "Cannot bind function %s::%s to object of class %s", func->common.scope->name, func->common.function_name, Z_OBJCE_P(this_ptr)->name);
scope = NULL;
this_ptr = NULL;
}
} else {
/* if it's a free function, we won't set scope & this since they're meaningless */
this_ptr = NULL;
scope = NULL;
}
}

/* Invariants:
* If the closure is unscoped, it has no bound object.
* The the closure is scoped, it's either static or it's bound */
closure->func.common.scope = scope;
if (scope) {
closure->func.common.fn_flags |= ZEND_ACC_PUBLIC;
if (this_ptr && (closure->func.common.fn_flags & ZEND_ACC_STATIC) == 0) {
closure->this_ptr = this_ptr;
Z_ADDREF_P(this_ptr);
} else {
closure->func.common.fn_flags |= ZEND_ACC_STATIC;
closure->this_ptr = NULL;
}
} else {
closure->this_ptr = NULL;
}
}
/* }}} */

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