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PHP 7.3 INTERNALS UPGRADE NOTES | |
1. Internal API changes | |
a. array_init() and array_init_size() | |
b. Run-time constant operand addressing | |
c. Array/Object recursion protection | |
d. HASH_FLAG_PERSISTENT | |
e. AST and IS_CONSTANT | |
f. GC_REFCOUNT() | |
g. zend_get_parameters() | |
h. zend_register_persistent_resource() | |
i. RAND_RANGE() | |
j. cast_object() with _IS_NUMBER | |
k. zend_fcall_info_cache.initialized | |
l. php_hrtime_current() | |
m. zend_cpu_supports() | |
n. IS_TYPE_COPYABLE | |
o. IS_UNUSED | |
p. VM instruction operands (FETCH_CLASS, FETCH_CONSTANT, CATCH) | |
q. sapi_cli_single_write() | |
r. php_url | |
s. zend_function.reserved[] | |
t. zif_handler | |
u. GC_G | |
v. php_add[c]slashes | |
w. zend_class_entry.iterator_funcs | |
x. Class declaration opcodes (DECLARE_INHERITED_CLASS ...) | |
y. zend_constant | |
z. HAVE_ST_BLKSIZE and HAVE_ST_RDEV | |
aa. RETSIGTYPE | |
bb. php_setcookie | |
2. Build system changes | |
a. Unix build system changes | |
b. Windows build system changes | |
3. Module changes | |
======================== | |
1. Internal API changes | |
======================== | |
a. array_init() and array_init_size() are not functions anymore. | |
They don't return any values. | |
b. In 64-bit builds PHP-7.2 and below used relative run-time constant operand | |
addressing. E.g. opline->op1.constant kept an offset from start of literals | |
table - op_array->literals. To speedup access op_array->literals was cached | |
in execute_data->literals. So the resulting address calculated as | |
EX(literals) + opline->op1.constant. | |
Now at run-time literals allocated close to opcodes, and addressed | |
relatively from current opline. This eliminates load of EX(literals) on | |
each constant access as well as EX(literals) initialization on each call. | |
As result some related macros were removed (ZEND_EX_USE_LITERALS, | |
EX_LOAD_LITERALS, EX_LITERALS, RT_CONSTANT_EX, EX_CONSTANT) or changed | |
(RT_CONSTANT, ZEND_PASS_TWO_UPDATE_CONSTANT, ZEND_PASS_TWO_UNDO_CONSTANT). | |
This change may affect only some "system" extensions. EX_LITERALS, | |
RT_CONSTANT_EX, EX_CONSTANT should be substituted by RT_CONSTANT, and now | |
use "opline" (instead of "op_array") as first argument. | |
c. Protection from recursion during processing circular data structures was | |
refactored. HashTable.nApplyCount and IS_OBJ_APPLY_COUNT are replaced by | |
single flag GC_PROTECTED. Corresponding macros Z_OBJ_APPLY_COUNT, | |
Z_OBJ_INC_APPLY_COUNT, Z_OBJ_DEC_APPLY_COUNT, ZEND_HASH_GET_APPLY_COUNT, | |
ZEND_HASH_INC_APPLY_COUNT, ZEND_HASH_DEC_APPLY_COUNT are replaced with | |
GC_IS_RECURSIVE, GC_PROTECT_RECURSION, GC_UNPROTECT_RECURSION, | |
Z_IS_RECURSIVE, Z_PROTECT_RECURSION, Z_UNPROTECT_RECURSION. | |
HASH_FLAG_APPLY_PROTECTION flag and ZEND_HASH_APPLY_PROTECTION() macro | |
are removed. All mutable arrays should use recursion protection. | |
Corresponding checks should be replaced by Z_REFCOUNTED() or | |
!(GC_FLAGS(p) & GC_IMMUTABLE). | |
d. HASH_FLAG_PERSISTENT renamed into IS_ARRAY_PERSISTENT and moved into | |
GC_FLAGS (to be consistent with IS_STR_PERSISTENT). | |
e. zend_ast_ref structure is changed to use only one allocation. | |
zend_ast_copy() now returns zend_ast_ref (instead of zend_asr). | |
zend_ast_destroy_and_free() is removed. ZVAL_NEW_AST() is replaced | |
by ZVAL_AST(). | |
IS_CONSTANT type and Z_CONST_FLAGS() are removed. Now constants are always | |
represented using IS_CONSTANT_AST (ZEND_AST_CONSTANT kind). AST node | |
attributes are used instead of constant flags. IS_TYPE_CONSTANT flag is | |
removed, but Z_CONSTANT() macro is kept for compatibility. | |
f. GC_REFCOUNT() is turned into inline function and can't be modified direcly. | |
All reference-counting operations should be done through corresponding | |
macros GC_SET_REFCOUNT(), GC_ADDREF() and GC_DELREF(). | |
GC_REFCOUNT(p)++ should be changed into GC_ADDREF(p), | |
GC_REFCOUNT(p)-- into GC_DELREF(p), | |
GC_REFCOUNT(p) = 1 into GC_SET_REFCOUNT(p, 1). | |
g. The zend_get_parameters() and zend_get_parameters_ex() functions were | |
removed. Instead zend_parse_parameters() should be used. | |
h. New functions zend_register_persistent_resource() or | |
zend_register_persistent_resource_ex() should beused to register | |
persistent resources, instead of manual insertion into EG(persistent_list). | |
i. The RAND_RANGE() macro has been removed. php_mt_rand_range() should be | |
used instead. | |
j. The cast_object() object handler now also accepts the _IS_NUMBER type. The | |
handler should return either an integer or float value in this case, | |
whichever is more appropriate. | |
k. zend_fcall_info_cache.initialized is removed. zend_fcall_info_cache is | |
initialized if zend_fcall_info_cache.function_handler is set. | |
l. php_hrtime_current() delivers the number of nanoseconds since an uncertain | |
point in the past. | |
m. zend_cpu_supports() determines if a feature is supported by current cpu. | |
Also serial inline zend_cpu_supports_xxx() are added, which is designed for | |
ifunc resolver function, as resolver function should not depend on any | |
external function. | |
n. IS_TYPE_COPYABLE flag is removed. IS_STRING zvals didn't need to be | |
duplication by zval_copy_ctor(), ZVAL_DUP() and SEPARATE_ZVAL*() macros. | |
Interned strings didn't set IS_TYPE_COPYABLE, so they aren't affected at | |
all. Now instead of checking for IS_TYPE_COPYABLE, engine checks for | |
IS_ARRAY type (it may be IS_TYPE_REFCOUNTED or not). All the related | |
macros: Z_COPYABLE..., Z_IMMUTABLE... are kept for compatibility. | |
o. IS_UNUSED became zero and can't be used as a bitmask (there were no such | |
usages in PHP sources). | |
p. Operands of few VM instructions were changed | |
- FETCH_CLASS op1<fetch-flags>, op2<name>, result<var> | |
- FETCH_CONSTANT op1<fetch-flags>, op2<name>, result<tmp> | |
- CATCH ext<last-flag>, op1<name>, op2<jump_addr>, result<cv> | |
q. sapi_cli_single_write() now returns ssize_t instead of size_t. | |
r. fields of php_url struct change from char * to zend_string * | |
s. Special purpose zend_functions marked by ZEND_ACC_CALL_VIA_TRAMPOLINE or | |
ZEND_ACC_FAKE_CLOSURE flags use reserved[0] for internal purpose. | |
Third party extensions must not modify reserved[] fields of these functions. | |
t. For internal functions the typedef zif_handler has been introduced. It is | |
recommended to use this from now on, instead of defining own handler types. | |
u. The GC globals (GC_G) are now private. Use the new zend_gc_get_status() to | |
retrieve status information of the GC. | |
v. The should_free argument of the php_add[c]slashes functions has been | |
removed. It is now always the caller's responsibility to free the passed | |
string. | |
w. zend_class_entry.iterator_funcs have been replaced by iterator_funcs_ptr. | |
You don't have to set its value, setting parent.funcs in the get_iterator | |
function is enough. | |
x. Class declaration opcode formats were changed | |
- DECLARE_INHERITED_CLASS and DECLARE_ANON_INHERITED_CLASS now encode parent | |
class name in second operand directly (as IS_CONST operand). Previously, | |
parent class was fetched by the prior FETCH_CLASS opcode. | |
- ADD_INTERFACE and ADD_TRAIT don't use run-time cache to keep interface or | |
trait. These instructions are executed once, and caching is useless. | |
y. zend_constant.flags and zend_constant.module_number are packed into | |
reserved space inside zend_constant.value. They should be accessed using | |
ZEND_CONSTANT_FLAGS(), ZEND_CONSTANT_MODULE_NUMBER() and | |
ZEND_CONSTANT_SET_FLAGS() macros. | |
z. HAVE_ST_BLKSIZE must be replaced with HAVE_STRUCT_STAT_ST_BLKSIZE and | |
HAVE_ST_RDEV must be replaced with HAVE_STRUCT_STAT_ST_RDEV. | |
aa. RETSIGTYPE has been removed from the generated php_config.h and should be | |
replaced with void. | |
bb. php_setcookie() now expects an additional samesite argument, and the | |
url_encode parameter has been moved to the end. The signature is now: | |
int php_setcookie(zend_string *name, zend_string *value, time_t expires, | |
zend_string *path, zend_string *domain, int secure, | |
int httponly, zend_string *samesite, int url_encode); | |
======================== | |
2. Build system changes | |
======================== | |
a. Unix build system changes | |
- PHP_PROG_LEX, TSRM_CHECK_GCC_ARG, and LIBZEND_CPLUSPLUS_CHECKS Autoconf | |
macros have been removed. | |
- Minimum Autoconf version is 2.68+ for generating the configure script. | |
b. Windows build system changes | |
- ZEND_WIN32_FORCE_INLINE doesn't affect C++ anymore. zend_always_inline is | |
still usable in C++, but anything else inlining related is up to | |
compiler. | |
- ZEND_WIN32_KEEP_INLINE was removed, it was only needed for C++ | |
convenience and is now default behavior with C++. | |
- New configure option --enable-native-intrinsics accepts a list of the | |
intrinsic optimizations to enable. It affects both the code generation | |
and the explicit optimizations guarded by preprocessor macros. | |
- The configure option --with-codegen-arch accepts only ia32 as a value. | |
Use it, to produce builds suitable for older processors without SSE2 or | |
even SSE support. | |
======================== | |
3. Module changes | |
======================== |