Merge branch 'PHP-7.4'

Fix shift UB in constants

We were shifting out the top bit of a signed integer.

Constify some char* arguments or return values of ZEND_API

Closes GH-4247.

Merge branch 'PHP-7.4'

Support full variance if autoloading is used

Keep track of delayed variance obligations and check them after
linking a class is otherwise finished. Obligations may either be
unresolv

Support full variance if autoloading is used

Keep track of delayed variance obligations and check them after
linking a class is otherwise finished. Obligations may either be
unresolved method compatibility (because the necessecary classes
aren't available yet) or open parent/interface dependencies. The
latter occur because we allow the use of not fully linked classes
as parents/interfaces now.

An important aspect of the implementation is we do not require
classes involved in variance checks to be fully linked in order for
the class to be fully linked. Because the involved types do have to
exist in the class table (as partially linked classes) and we do
check these for correct variance, we have the guarantee that either
those classes will successfully link lateron or generate an error,
but there is no way to actually use them until that point and as
such no possibility of violating the variance contract. This is
important because it ensures that a class declaration always either
errors or will produce an immediately usable class afterwards --
there are no cases where the finalization of the class declaration
has to be delayed until a later time, as earlier variants of this
patch did.

Because variance checks deal with classes in various stages of
linking, we need to use a special instanceof implementation that
supports this, and also introduce finer-grained flags that tell us
which parts have been linked already and which haven't.

Class autoloading for variance checks is delayed into a separate
stage after the class is otherwise linked and before delayed
variance obligations are processed. This separation is needed to
handle cases like A extends B extends C, where B is the autoload
root, but C is required to check variance. This could end up
loading C while the class structure of B is in an inconsistent
state.

show more ...

Register class before fetching parent

We want the class declaration to be available while compiling the
parent class.

Merge branch 'PHP-7.4'

* PHP-7.4:
Better hot/cold code splitting

Better hot/cold code splitting

Merge branch 'PHP-7.4'

Forbid use of not fully linked classes

Merge branch 'PHP-7.4'

* PHP-7.4:
Revert "Rename *.l files to *.re"

Revert "Rename *.l files to *.re"

This reverts commit 969047749d33bb88a0573aa91a57e2070335111a.

Merge branch 'PHP-7.4'

* PHP-7.4:
Rename *.l files to *.re

Rename *.l files to *.re

This syncs PHP lexer files to all use *.re extension. The *.re files are
processed with the RE2C tool.

Merge branch 'deprecate_concat_add_sub' into PHP-8.4

Merge branch 'PHP-7.4'

* PHP-7.4:
Removed ability to compile PHP without EX(run_time_cache). ZEND_EX_USE_RUN_TIME_CACHE was always defined.

Removed ability to compile PHP without EX(run_time_cache). ZEND_EX_USE_RUN_TIME_CACHE was always defined.

Merge branch 'PHP-7.4'

Deprecate left-associative ternary

Deprecate nesting ternary operators without explicit parentheses.

RFC: https://wiki.php.net/rfc/ternary_associativity

Merge branch 'PHP-7.4'

Implement arrow functions

Per RFC: https://wiki.php.net/rfc/arrow_functions_v2

Co-authored-by: Levi Morrison <levim@php.net>
Co-authored-by: Bob Weinand <bobwei9@hotmail.com>

Merge branch 'PHP-7.4'

* PHP-7.4:
Also, use ZEND_ACC_PRELOADED for classes

Also, use ZEND_ACC_PRELOADED for classes

Fix flag value clash affecting defined() function

Backported call frame initialization improvement