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Stdlib: define() object constant — dynamic properties null not stored values (ext/standard/basic_functions.c) #17676
Description
Category
stdlib · php-src-strict
Problem
define() accepts an object value, but materialized properties are empty on read. Zend stores and returns dynamic property values on the constant object; this compiler loses them (property reads yield empty values / wrong json_encode / empty get_object_vars).
| Repro | Zend 8.2+ | VM (2026-07-10) |
|---|---|---|
define('MY_OBJ', (object)['x'=>1,'y'=>2]); MY_OBJ->x |
1 |
empty / (object) array() |
json_encode(MY_OBJ) |
{"x":1,"y":2} |
{"x":null,"y":null} |
get_object_vars(MY_OBJ) |
['x'=>1,'y'=>2] |
[] |
php-src reference
- php/php-src
ext/standard/basic_functions.c—PHP_FUNCTION(define), constant registration for object values - php/php-src
Zend/zend_constants.c—zend_register_constant, object constant materialization
PHP implementation target
ext/standard/define.php(or equivalent lowering) — preserve object dynamic properties when registering user constants; avoid scalarizing object slots to emptystdClass- Shared VM constant table path used by bareword/
constant()resolution
Repro
./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_define_object_constant.php'Done when
-
test/repro/maintainer_gap_define_object_constant.phpprintsokon VM/JIT/AOT - Compliance guard under
test/compliance/cases/standard/define_object_constant.phpt - php-src-strict; no php-compiler-strict shortcut
Activity
PurHur commentedon Jul 10, 2026
claim: PHP Compiler STD Lib — starting this run
PurHur commentedon Jul 10, 2026
claim: PHP Compiler STD Lib — starting this run
PurHur commentedon Jul 10, 2026
claim: PHP Compiler STD Lib Advanced — batch (issues #17676, #17693, #17680)
Stdlib: define object constants, readonly introspection, ldap phantom…
PurHur commentedon Jul 10, 2026
Merged via #17703.
Verification (VM):
PurHur commentedon Jul 10, 2026
Focused VM fix pushed in PR #17704 (materialize detached object constants, prescan skip for
(object)[...]define values, cast detach, temp-release refcount fix).Verification (VM):
```bash
php bin/vm.php test/repro/maintainer_gap_define_object_constant.php # ok
php bin/vm.php test/compliance/cases/stdlib/define_object_constant.phpt # ok
phpunit --filter define_object_constant # OK (2 tests)
```
AOT compile for this repro remains a follow-up (JIT runtime user-constant fetch + array-literal IR). Overlaps batch PR #17703 — prefer one merge path for #17676.
Merge origin/master into define() object constant fix (#17676).
Fix define() object constants preserving dynamic property values (#17676
PurHur commentedon Jul 10, 2026
Merged via #17704.
Verification:
Root cause:
define('MY_OBJ', (object)[...])stored shallow/shared object handles; dead temp slot cleanup double-released constant objects after property reads.Fix: Deep
EnumCaseSupport::materializeConstantValue()+ClassConstMaterializer::detachConstantValue()for object constants; prescan skips inner array for(object)[...]; temp release no longer double-drops refcount on constant objects (userConstantReferencesObjectIdguard).php-src:
ext/standard/basic_functions.c,Zend/zend_constants.cStdlib: fix DOM global assign after define() object detach (#17722) (#…
Fix define() array element assign-by-ref write-context fatal (#26488) (…