JIT: Split zend_jit_hash_index_lookup_rw() into zend_jit_hash_index_lookup_rw() and zend_jit_hash_index_lookup_rw_no_packed().

The previous version might fail if zend_jit_hash_index_lookup_rw() was called for packed array.

Author: dstogov

ext/opcache/jit/zend_jit_disasm_x86.c

@@ -411,6 +411,7 @@ static int zend_jit_disasm_init(void)
 	REGISTER_HELPER(zend_jit_leave_top_func_helper);
 	REGISTER_HELPER(zend_jit_leave_func_helper);
 	REGISTER_HELPER(zend_jit_symtable_find);
+	REGISTER_HELPER(zend_jit_hash_index_lookup_rw_no_packed);
 	REGISTER_HELPER(zend_jit_hash_index_lookup_rw);
 	REGISTER_HELPER(zend_jit_hash_index_lookup_w);
 	REGISTER_HELPER(zend_jit_hash_lookup_rw);

ext/opcache/jit/zend_jit_helpers.c

@@ -246,7 +246,7 @@ static zval* ZEND_FASTCALL zend_jit_symtable_find(HashTable *ht, zend_string *st
 	return zend_hash_find(ht, str);
 }
 
-static zval* ZEND_FASTCALL zend_jit_hash_index_lookup_rw(HashTable *ht, zend_long idx)
+static zval* ZEND_FASTCALL zend_jit_hash_index_lookup_rw_no_packed(HashTable *ht, zend_long idx)
 {
 	zval *retval = _zend_hash_index_find(ht, idx);
 
@@ -259,6 +259,19 @@ static zval* ZEND_FASTCALL zend_jit_hash_index_lookup_rw(HashTable *ht, zend_lon
 	return retval;
 }
 
+static zval* ZEND_FASTCALL zend_jit_hash_index_lookup_rw(HashTable *ht, zend_long idx)
+{
+	zval *retval = zend_hash_index_find(ht, idx);
+
+	if (!retval) {
+		if (UNEXPECTED(zend_undefined_offset_write(ht, idx) == FAILURE)) {
+			return NULL;
+		}
+		retval = zend_hash_index_add_new(ht, idx, &EG(uninitialized_zval));
+	}
+	return retval;
+}
+
 static zval* ZEND_FASTCALL zend_jit_hash_index_lookup_w(HashTable *ht, zend_long idx)
 {
 	zval *retval = _zend_hash_index_find(ht, idx);

ext/opcache/jit/zend_jit_x86.dasc

@@ -5569,7 +5569,11 @@ static int zend_jit_fetch_dimension_address_inner(dasm_State **Dst, const zend_o
 					|	GET_ZVAL_LVAL ZREG_FCARG2a, op2_addr
 				}
 				|	SET_EX_OPLINE opline, r0
-				|	EXT_CALL zend_jit_hash_index_lookup_rw, r0
+				if (packed_loaded) {
+					|	EXT_CALL zend_jit_hash_index_lookup_rw_no_packed, r0
+				} else {
+					|	EXT_CALL zend_jit_hash_index_lookup_rw, r0
+				}
 				|	test r0, r0
 				|	jz >9
 				break;