Fixed bug #38469 (Unexpected creation of cycle).

diff --git a/NEWS b/NEWS
index f3520c5d59a226d7821b2e1b384dc1f877f719ac..5abd8a01b8c9c282c4e690156863a8abe08f0cc2 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -60,6 +60,7 @@ PHP                                                                        NEWS
 - Fixed bug #42272 (var_export() incorrectly escapes char(0)). (Derick)
 - Fixed bug #42261 (Incorrect lengths for date and boolean data types).
   (Ilia)
+- Fixed bug #38468 (Unexpected creation of cycle). (Dmitry)
 
 08 Nov 2007, PHP 5.2.5
 - Upgraded PCRE to version 7.3 (Nuno)

diff --git a/Zend/tests/bug38469.phpt b/Zend/tests/bug38469.phpt
new file mode 100644 (file)
index 0000000..51fffb3
--- /dev/null
+++ b/Zend/tests/bug38469.phpt
@@ -0,0 +1,28 @@
+--TEST--
+Bug #38469 Unexpected creation of cycle
+--FILE--
+<?php
+$a = array();
+$a[0] = $a;
+var_dump($a);
+$b = array(array());
+$b[0][0] = $b;
+var_dump($b);
+?>
+--EXPECT--
+array(1) {
+  [0]=>
+  array(0) {
+  }
+}
+array(1) {
+  [0]=>
+  array(1) {
+    [0]=>
+    array(1) {
+      [0]=>
+      array(0) {
+      }
+    }
+  }
+}

diff --git a/Zend/zend_compile.c b/Zend/zend_compile.c
index 0a7c5a338d9971bb6c5601b4b1611fe07a2da63e..f7083442da6ba192541f5350678d5ec5c99d9685 100644 (file)
--- a/Zend/zend_compile.c
+++ b/Zend/zend_compile.c
@@ -541,8 +541,39 @@ static zend_bool opline_is_fetch_this(zend_op *opline TSRMLS_DC)
 
 void zend_do_assign(znode *result, znode *variable, znode *value TSRMLS_DC)
 {
-       int last_op_number = get_next_op_number(CG(active_op_array));
-       zend_op *opline = get_next_op(CG(active_op_array) TSRMLS_CC);
+       int last_op_number;
+       zend_op *opline;
+
+       if (value->op_type == IS_CV) {
+               zend_llist *fetch_list_ptr;
+
+               zend_stack_top(&CG(bp_stack), (void **) &fetch_list_ptr);
+               if (fetch_list_ptr && fetch_list_ptr->head) {
+                       opline = (zend_op *)fetch_list_ptr->head->data;
+
+                       if (opline->opcode == ZEND_FETCH_DIM_W &&
+                           opline->op1.op_type == IS_CV &&
+                           opline->op1.u.var == value->u.var) {
+
+                               opline = get_next_op(CG(active_op_array) TSRMLS_CC);
+                               opline->opcode = ZEND_FETCH_R;
+                               opline->result.op_type = IS_VAR;
+                               opline->result.u.EA.type = 0;
+                               opline->result.u.var = get_temporary_variable(CG(active_op_array));
+                               opline->op1.op_type = IS_CONST;
+                               ZVAL_STRINGL(&opline->op1.u.constant,
+                                       CG(active_op_array)->vars[value->u.var].name, 
+                                       CG(active_op_array)->vars[value->u.var].name_len, 1);
+                               SET_UNUSED(opline->op2);
+                               value = &opline->result;
+                       }
+               }
+       }
+
+       zend_do_end_variable_parse(BP_VAR_W, 0 TSRMLS_CC);
+
+       last_op_number = get_next_op_number(CG(active_op_array));
+       opline = get_next_op(CG(active_op_array) TSRMLS_CC);
 
        if (variable->op_type == IS_VAR) {
                int n = 0;
@@ -3420,8 +3451,6 @@ void zend_do_list_end(znode *result, znode *expr TSRMLS_DC)
        zend_llist_element *dimension;
        zend_op *opline;
        znode last_container;
-       int last_op_number;
-       zend_op *last_op;
 
        le = CG(list_llist).head;
        while (le) {
@@ -3461,9 +3490,6 @@ void zend_do_list_end(znode *result, znode *expr TSRMLS_DC)
                }
                ((list_llist_element *) le->data)->value = last_container;
                zend_llist_destroy(&((list_llist_element *) le->data)->dimensions);
-               zend_do_end_variable_parse(BP_VAR_W, 0 TSRMLS_CC);
-               last_op_number = get_next_op_number(CG(active_op_array))-1;
-               last_op = &CG(active_op_array)->opcodes[last_op_number];
                zend_do_assign(result, &((list_llist_element *) le->data)->var, &((list_llist_element *) le->data)->value TSRMLS_CC);
                zend_do_free(result TSRMLS_CC);
                le = le->next;
@@ -3824,9 +3850,9 @@ void zend_do_foreach_cont(znode *foreach_token, znode *open_brackets_token, znod
 
        value_node = opline->result;
 
-       zend_do_end_variable_parse(BP_VAR_W, 0 TSRMLS_CC);
        if (assign_by_ref) {
                /* Mark FE_FETCH as IS_VAR as it holds the data directly as a value */
+               zend_do_end_variable_parse(BP_VAR_W, 0 TSRMLS_CC);
                zend_do_assign_ref(NULL, value, &value_node TSRMLS_CC);
        } else {
                zend_do_assign(&dummy, value, &value_node TSRMLS_CC);
@@ -3836,7 +3862,6 @@ void zend_do_foreach_cont(znode *foreach_token, znode *open_brackets_token, znod
        if (key->op_type != IS_UNUSED) {
                znode key_node;
 
-               zend_do_end_variable_parse(BP_VAR_W, 0 TSRMLS_CC);
                opline = &CG(active_op_array)->opcodes[as_token->u.opline_num+1];
                opline->result.op_type = IS_TMP_VAR;
                opline->result.u.EA.type = 0;

diff --git a/Zend/zend_language_parser.y b/Zend/zend_language_parser.y
index 017c96dc4e6b5789d9edbb8a53ffd5fcba75eea3..1fe6759e2609fec35444ba82a1dd3f68e6c1e8de 100644 (file)
--- a/Zend/zend_language_parser.y
+++ b/Zend/zend_language_parser.y
@@ -551,7 +551,7 @@ non_empty_for_expr:
 
 expr_without_variable:
                T_LIST '(' { zend_do_list_init(TSRMLS_C); } assignment_list ')' '=' expr { zend_do_list_end(&$$, &$7 TSRMLS_CC); }
-       |       variable '=' expr               { zend_check_writable_variable(&$1); zend_do_end_variable_parse(BP_VAR_W, 0 TSRMLS_CC); zend_do_assign(&$$, &$1, &$3 TSRMLS_CC); }
+       |       variable '=' expr               { zend_check_writable_variable(&$1); zend_do_assign(&$$, &$1, &$3 TSRMLS_CC); }
        |       variable '=' '&' variable { zend_check_writable_variable(&$1); zend_do_end_variable_parse(BP_VAR_W, 0 TSRMLS_CC); zend_do_end_variable_parse(BP_VAR_W, 0 TSRMLS_CC); zend_do_assign_ref(&$$, &$1, &$4 TSRMLS_CC); }
        |       variable '=' '&' T_NEW class_name_reference { zend_error(E_STRICT, "Assigning the return value of new by reference is deprecated");  zend_check_writable_variable(&$1); zend_do_extended_fcall_begin(TSRMLS_C); zend_do_begin_new_object(&$4, &$5 TSRMLS_CC); } ctor_arguments { zend_do_end_new_object(&$3, &$4, &$7 TSRMLS_CC); zend_do_extended_fcall_end(TSRMLS_C); zend_do_end_variable_parse(BP_VAR_W, 0 TSRMLS_CC); zend_do_assign_ref(&$$, &$1, &$3 TSRMLS_CC); }
        |       T_NEW class_name_reference { zend_do_extended_fcall_begin(TSRMLS_C); zend_do_begin_new_object(&$1, &$2 TSRMLS_CC); } ctor_arguments { zend_do_end_new_object(&$$, &$1, &$4 TSRMLS_CC); zend_do_extended_fcall_end(TSRMLS_C);}