1PHP 7.3 INTERNALS UPGRADE NOTES 2 31. Internal API changes 4 a. array_init() and array_init_size() 5 b. Run-time constant operand addressing 6 c. Array/Object recursion protection 7 d. HASH_FLAG_PERSISTENT 8 e. AST and IS_CONSTANT 9 f. GC_REFCOUNT() 10 g. zend_get_parameters() 11 h. zend_register_persistent_resource() 12 i. RAND_RANGE() 13 j. cast_object() with _IS_NUMBER 14 k. zend_fcall_info_cache.initialized 15 l. php_hrtime_current() 16 m. zend_cpu_supports() 17 n. IS_TYPE_COPYABLE 18 o. IS_UNUSED 19 p. VM instruction operands (FETCH_CLASS, FETCH_CONSTANT, CATCH) 20 q. sapi_cli_single_write() 21 r. php_url 22 s. zend_function.reserved[] 23 t. zif_handler 24 u. GC_G 25 v. php_add[c]slashes 26 w. zend_class_entry.iterator_funcs 27 x. Class declaration opcodes (DECLARE_INHERITED_CLASS ...) 28 y. zend_constant 29 z. HAVE_ST_BLKSIZE and HAVE_ST_RDEV 30 aa. RETSIGTYPE 31 bb. php_setcookie 32 332. Build system changes 34 a. Unix build system changes 35 b. Windows build system changes 36 37 383. Module changes 39 40======================== 411. Internal API changes 42======================== 43 44 a. array_init() and array_init_size() are not functions anymore. 45 They don't return any values. 46 47 b. In 64-bit builds PHP-7.2 and below used relative run-time constant operand 48 addressing. E.g. opline->op1.constant kept an offset from start of literals 49 table - op_array->literals. To speedup access op_array->literals was cached 50 in execute_data->literals. So the resulting address calculated as 51 EX(literals) + opline->op1.constant. 52 53 Now at run-time literals allocated close to opcodes, and addressed 54 relatively from current opline. This eliminates load of EX(literals) on 55 each constant access as well as EX(literals) initialization on each call. 56 57 As result some related macros were removed (ZEND_EX_USE_LITERALS, 58 EX_LOAD_LITERALS, EX_LITERALS, RT_CONSTANT_EX, EX_CONSTANT) or changed 59 (RT_CONSTANT, ZEND_PASS_TWO_UPDATE_CONSTANT, ZEND_PASS_TWO_UNDO_CONSTANT). 60 This change may affect only some "system" extensions. EX_LITERALS, 61 RT_CONSTANT_EX, EX_CONSTANT should be substituted by RT_CONSTANT, and now 62 use "opline" (instead of "op_array") as first argument. 63 64 c. Protection from recursion during processing circular data structures was 65 refactored. HashTable.nApplyCount and IS_OBJ_APPLY_COUNT are replaced by 66 single flag GC_PROTECTED. Corresponding macros Z_OBJ_APPLY_COUNT, 67 Z_OBJ_INC_APPLY_COUNT, Z_OBJ_DEC_APPLY_COUNT, ZEND_HASH_GET_APPLY_COUNT, 68 ZEND_HASH_INC_APPLY_COUNT, ZEND_HASH_DEC_APPLY_COUNT are replaced with 69 GC_IS_RECURSIVE, GC_PROTECT_RECURSION, GC_UNPROTECT_RECURSION, 70 Z_IS_RECURSIVE, Z_PROTECT_RECURSION, Z_UNPROTECT_RECURSION. 71 72 HASH_FLAG_APPLY_PROTECTION flag and ZEND_HASH_APPLY_PROTECTION() macro 73 are removed. All mutable arrays should use recursion protection. 74 Corresponding checks should be replaced by Z_REFCOUNTED() or 75 !(GC_FLAGS(p) & GC_IMMUTABLE). 76 77 d. HASH_FLAG_PERSISTENT renamed into IS_ARRAY_PERSISTENT and moved into 78 GC_FLAGS (to be consistent with IS_STR_PERSISTENT). 79 80 e. zend_ast_ref structure is changed to use only one allocation. 81 zend_ast_copy() now returns zend_ast_ref (instead of zend_asr). 82 zend_ast_destroy_and_free() is removed. ZVAL_NEW_AST() is replaced 83 by ZVAL_AST(). 84 85 IS_CONSTANT type and Z_CONST_FLAGS() are removed. Now constants are always 86 represented using IS_CONSTANT_AST (ZEND_AST_CONSTANT kind). AST node 87 attributes are used instead of constant flags. IS_TYPE_CONSTANT flag is 88 removed, but Z_CONSTANT() macro is kept for compatibility. 89 90 f. GC_REFCOUNT() is turned into inline function and can't be modified direcly. 91 All reference-counting operations should be done through corresponding 92 macros GC_SET_REFCOUNT(), GC_ADDREF() and GC_DELREF(). 93 94 GC_REFCOUNT(p)++ should be changed into GC_ADDREF(p), 95 GC_REFCOUNT(p)-- into GC_DELREF(p), 96 GC_REFCOUNT(p) = 1 into GC_SET_REFCOUNT(p, 1). 97 98 g. The zend_get_parameters() and zend_get_parameters_ex() functions were 99 removed. Instead zend_parse_parameters() should be used. 100 101 h. New functions zend_register_persistent_resource() or 102 zend_register_persistent_resource_ex() should beused to register 103 persistent resources, instead of manual insertion into EG(persistent_list). 104 105 i. The RAND_RANGE() macro has been removed. php_mt_rand_range() should be 106 used instead. 107 108 j. The cast_object() object handler now also accepts the _IS_NUMBER type. The 109 handler should return either an integer or float value in this case, 110 whichever is more appropriate. 111 112 k. zend_fcall_info_cache.initialized is removed. zend_fcall_info_cache is 113 initialized if zend_fcall_info_cache.function_handler is set. 114 115 l. php_hrtime_current() delivers the number of nanoseconds since an uncertain 116 point in the past. 117 118 m. zend_cpu_supports() determines if a feature is supported by current cpu. 119 Also serial inline zend_cpu_supports_xxx() are added, which is designed for 120 ifunc resolver function, as resolver function should not depend on any 121 external function. 122 123 n. IS_TYPE_COPYABLE flag is removed. IS_STRING zvals didn't need to be 124 duplication by zval_copy_ctor(), ZVAL_DUP() and SEPARATE_ZVAL*() macros. 125 Interned strings didn't set IS_TYPE_COPYABLE, so they aren't affected at 126 all. Now instead of checking for IS_TYPE_COPYABLE, engine checks for 127 IS_ARRAY type (it may be IS_TYPE_REFCOUNTED or not). All the related 128 macros: Z_COPYABLE..., Z_IMMUTABLE... are kept for compatibility. 129 130 o. IS_UNUSED became zero and can't be used as a bitmask (there were no such 131 usages in PHP sources). 132 133 p. Operands of few VM instructions were changed 134 - FETCH_CLASS op1<fetch-flags>, op2<name>, result<var> 135 - FETCH_CONSTANT op1<fetch-flags>, op2<name>, result<tmp> 136 - CATCH ext<last-flag>, op1<name>, op2<jump_addr>, result<cv> 137 138 q. sapi_cli_single_write() now returns ssize_t instead of size_t. 139 140 r. fields of php_url struct change from char * to zend_string * 141 142 s. Special purpose zend_functions marked by ZEND_ACC_CALL_VIA_TRAMPOLINE or 143 ZEND_ACC_FAKE_CLOSURE flags use reserved[0] for internal purpose. 144 Third party extensions must not modify reserved[] fields of these functions. 145 146 t. For internal functions the typedef zif_handler has been introduced. It is 147 recommended to use this from now on, instead of defining own handler types. 148 149 u. The GC globals (GC_G) are now private. Use the new zend_gc_get_status() to 150 retrieve status information of the GC. 151 152 v. The should_free argument of the php_add[c]slashes functions has been 153 removed. It is now always the caller's responsibility to free the passed 154 string. 155 156 w. zend_class_entry.iterator_funcs have been replaced by iterator_funcs_ptr. 157 You don't have to set its value, setting parent.funcs in the get_iterator 158 function is enough. 159 160 x. Class declaration opcode formats were changed 161 - DECLARE_INHERITED_CLASS and DECLARE_ANON_INHERITED_CLASS now encode parent 162 class name in second operand directly (as IS_CONST operand). Previously, 163 parent class was fetched by the prior FETCH_CLASS opcode. 164 - ADD_INTERFACE and ADD_TRAIT don't use run-time cache to keep interface or 165 trait. These instructions are executed once, and caching is useless. 166 167 y. zend_constant.flags and zend_constant.module_number are packed into 168 reserved space inside zend_constant.value. They should be accessed using 169 ZEND_CONSTANT_FLAGS(), ZEND_CONSTANT_MODULE_NUMBER() and 170 ZEND_CONSTANT_SET_FLAGS() macros. 171 172 z. HAVE_ST_BLKSIZE must be replaced with HAVE_STRUCT_STAT_ST_BLKSIZE and 173 HAVE_ST_RDEV must be replaced with HAVE_STRUCT_STAT_ST_RDEV. 174 175 aa. RETSIGTYPE has been removed from the generated php_config.h and should be 176 replaced with void. 177 178 bb. php_setcookie() now expects an additional samesite argument, and the 179 url_encode parameter has been moved to the end. The signature is now: 180 int php_setcookie(zend_string *name, zend_string *value, time_t expires, 181 zend_string *path, zend_string *domain, int secure, 182 int httponly, zend_string *samesite, int url_encode); 183 184======================== 1852. Build system changes 186======================== 187 188 a. Unix build system changes 189 - PHP_PROG_LEX, TSRM_CHECK_GCC_ARG, and LIBZEND_CPLUSPLUS_CHECKS Autoconf 190 macros have been removed. 191 - Minimum Autoconf version is 2.68+ for generating the configure script. 192 193 b. Windows build system changes 194 - ZEND_WIN32_FORCE_INLINE doesn't affect C++ anymore. zend_always_inline is 195 still usable in C++, but anything else inlining related is up to 196 compiler. 197 - ZEND_WIN32_KEEP_INLINE was removed, it was only needed for C++ 198 convenience and is now default behavior with C++. 199 - New configure option --enable-native-intrinsics accepts a list of the 200 intrinsic optimizations to enable. It affects both the code generation 201 and the explicit optimizations guarded by preprocessor macros. 202 - The configure option --with-codegen-arch accepts only ia32 as a value. 203 Use it, to produce builds suitable for older processors without SSE2 or 204 even SSE support. 205 206======================== 2073. Module changes 208======================== 209
