RFC: https://wiki.php.net/rfc/dnf_types
This allows to combine union and intersection types together in the following form (A&B)|(X&Y)|T but not of the form (X|A)&(Y|B) or (X|A)&(Y|B)|T.
* Improve union type parsing
Co-authored-by: Sara Golemon <pollita@php.net>
This does a compile time transformation of ``iterable`` into ``Traversable|array`` which simplifies some of the LSP variance handling.
The arginfo generation script from stubs is updated to produce a union type when it encounters the type ``iterable``
Extension functions which do not regenerate the arginfo, or write them manually are still supported by mimicking the compile time transformation while registering the function.
Type Reflection is preserved for single ``iterable`` (and ``?iterable``) to produce a ReflectionNamedType with name ``iterable``, however usage of ``iterable`` in union types will be converted to ``array|Traversable``
Recorded errors may be attached to the wrong cached script when a fatal error
occurs during recording. This happens because the fatal error will cause a
bailout, which may prevent the recorded errors from being freed. If an other
script is compiled after bailout, or if a class is linked after bailout, the
recorded errors will be attached to it.
This change fixes this by freeing recorded errors before executing shutdown
functions.
Fixes GH-8063
I don't believe there's a reason anymore to first resolve all
delayed variance obligations, and then report errors if any are
left. We can report errors directly when resolving obligations.
We can't take ownership of the delayed autoload table here. It is
important that pending classes get loaded before resolving variance
of any nested classed, as they might actually be lower in the
hierarchy.
Produce a sensible error message for the case where inheritance
should fail. There is still a remaining issue that we sometimes
fail inheritance while we should not.
Traits do not support interfaces, so we should not implement
Stringable on them.
Also check the __toString() return type in the same way other
magic methods do, otherwise we would now miss the check in the
trait case.
- for packed arrays we store just an array of zvals without keys.
- the elements of packed array are accessible throuf as ht->arPacked[i]
instead of ht->arData[i]
- in addition to general ZEND_HASH_FOREACH_* macros, we introduced similar
familied for packed (ZEND_HASH_PACKED_FORECH_*) and real hashes
(ZEND_HASH_MAP_FOREACH_*)
- introduced an additional family of macros to access elements of array
(packed or real hashes) ZEND_ARRAY_ELEMET_SIZE, ZEND_ARRAY_ELEMET_EX,
ZEND_ARRAY_ELEMET, ZEND_ARRAY_NEXT_ELEMENT, ZEND_ARRAY_PREV_ELEMENT
- zend_hash_minmax() prototype was changed to compare only values
Because of smaller data set, this patch may show performance improvement
on some apps and benchmarks that use packed arrays. (~1% on PHP-Parser)
TODO:
- sapi/phpdbg needs special support for packed arrays (WATCH_ON_BUCKET).
- zend_hash_sort_ex() may require converting packed arrays to hash.
It's possible for delayed early binding opcodes to get optimized
away if they are "unreachable". However, we still need to attempt
early binding for them. (In some cases we also corrupt the early
binding list outright during optimization, which is how I got here.)
Fix this by storing information about delayed early binding
independently of DECLARE_CLASS_DELAYED opcodes, so early binding is
performed even after the opcode has been dropped.
Same as with other exceptions during inheritance, convert those
thrown during delayed class loading into fatal errors. We can't
properly deal with such exceptions, as inheritance cannot be
gracefully aborted at this point.
Fixes oss-fuzz #39405.
We shouldn't try to load further classes if one autoload throws.
This fixes oss-fuzz #38881, though I believe there are still two
deeper issues here: 1) Why do we allow autoloading with an active
exception? 2) Exception save & restore should probably also save
and restore the exception opline.
When adding the #[ReturnTypeWillChange] attribute in namespaced
code, you also need to use ReturnTypeWillChange, otherwise it
will be silently ignored and may result in confusion. Change the
deprecation message to suggest #[\ReturnTypeWillChange], which
will always work.
Closes GH-7454.
Just like during normal shutdown, we should set EG(active)=0
during the partial preloading shutdown, to make sure that no
user code can run.
We need to slightly tweak inheritance class loading to still
pick the right code path.
Currently, CE_CACHE on strings is only used with opcache interned strings. This
patch extends usage to non-opcache interned strings as well. This means that
most type strings can now make use of CE_CACHE even if opcache is not loaded,
which allows us to remove TYPE_HAS_CE kind, and fix some discrepancies
depending on whether a type stores a resolved or non-resolved name.
There are two cases where CE_CACHE will not be used:
* When opcache is not used and a permanent interned string (that is not an
internal class name) is used as a type name during the request. In this case
we can't allocate a map_ptr index for the permanent string, as it would be
not be in the permanent map_ptr index space.
* When opcache is used but the script is not cached (e.g. eval'd code or
opcache full). If opcache is used, we can't allocate additional map_ptr
indexes at runtime, because they may conflict with indexes allocated by
opcache.
In these two cases we would end up not using CE caching for property types
(argument/return types still have the separate cache slot).
It is very hard to determine in advance whether class linking will
fail due to missing dependencies in variance checks (#7314 attempts
this). This patch takes an alternative approach where we try to
perform inheritance on a copy of the class (zend_lazy_class_load)
and then restore the original class if inheritance fails. The fatal
error in that case is recorded and thrown as a warning later.
Closes GH-7319.
Instead always use the unlinked_uses table, which is already used
if opcache is used. Not much point in having a different mechanism
for the non-opcache case.
Currently, classes that can't be linked get moved back into the original script
and are not preloaded. As such classes may be referenced from functions that
did get preloaded, there is a preload autoload mechanism to load them at
runtime.
Since PHP 8.1, we can safely preload unlinked classes, which will then go
through usual lazy loading. This means that we no longer need the preload
autoload mechanism. However, we need to be careful not to modify any hash
table buckets in-place, and should create new buckets for lazy loaded classes.
When running without opcache, static_members_table is shared with
default_static_members_table. This is visible in reflection output,
because ReflectionProperty::getDefaultValue() will return the
current value, rather than the default value.
Address this by never sharing the table, which matches the behavior
we already see under opcache.
Fixes bug #80821.
Closes GH-7299.
Convert zend_hash_find_ex(..., 1) to zend_hash_find_known_hash(...)
Convert zend_hash_find_ex(..., 0) to zend_hash_find(...)
Also add serializable changes to UPGRADING.INTERNALS summary
Add support for readonly properties, for which only a single
initializing assignment from the declaring scope is allowed.
RFC: https://wiki.php.net/rfc/readonly_properties_v2
Closes GH-7089.
This prevents serialization and unserialization of a class and its
children in a way that does not depend on the zend_class_serialize_deny
and zend_class_unserialize_deny handlers that will be going away
in PHP 9 together with the Serializable interface.
In stubs, `@not-serializable` can be used to set this flag.
This patch only uses the new flag for a handful of Zend classes,
converting the remainder is left for later.
Closes GH-7249.
Fixes bug #81111.
