Improve optimizer support for class constants (#13438)

The following optimizations are added:

- Constant folding of final class constants
- Type inference of typed class constan

Improve optimizer support for class constants (#13438)

The following optimizations are added:

- Constant folding of final class constants
- Type inference of typed class constants

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Implement stackless internal function calls

Co-authored-by: Dmitry Stogov <dmitry@zend.com>

Closes GH-12461

Improve static inference in final class (#13298)

static may be treated like self if the class is final.

Add runtime type inference verification

Co-authored-by: Dmitry Stogov <dmitry@zend.com>

Closes GH-12930

Fixed type inference

Fixes oss-fuzz #65150

Allow arbitrary expressions in static variable initializer

Closes GH-9301

zend_compiler, ...: use `uint8_t` instead of `zend_uchar` (#10621)

`zend_uchar` suggests that the value is an ASCII character, but here,
it's about very small integers. This is misleadi

zend_compiler, ...: use `uint8_t` instead of `zend_uchar` (#10621)

`zend_uchar` suggests that the value is an ASCII character, but here,
it's about very small integers. This is misleading, so let's use a
C99 integer instead.

On all architectures currently supported by PHP, `zend_uchar` and
`uint8_t` are identical. This change is only about code readability.

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Implement GH-9826: Make class_alias() work with internal classes (#10483)

We can't increase the refcount of internal classes during request time.
To work around this problem we simply do

Implement GH-9826: Make class_alias() work with internal classes (#10483)

We can't increase the refcount of internal classes during request time.
To work around this problem we simply don't refcount aliases anymore and
add a check in the destruction to skip aliases entirely.
There were also some checks which checked for an alias implicitly by
comparing the refcount, these have been replaced by checking the type of
the zval instead.

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Improve the optimizer's check if a function is a prototype or not (#10467)

Currently, a function is considered a prototype if the function is not
marked as final. However, a class marked

Improve the optimizer's check if a function is a prototype or not (#10467)

Currently, a function is considered a prototype if the function is not
marked as final. However, a class marked as final also make it
impossible for a function to be overridden. Therefore, we know in this
case too that the function is not a prototype.
This allows the type inference algorithm to determine some types more
precisely, and can allow for more optimizations of the instructions.
Additionally, place some computation of the flags in their respective
blocks as a micro-optimization.

Note: anonymous classes *can* be extended (see test
Zend/tests/anon/011.phpt). Therefore we don't optimize this case.

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Make various pointers const in Zend/ (#10608)

* Zend/zend_operators: pass const pointers to zend_is_identical()

* Zend/zend_operators: pass const pointers to zend_get_{long,double}(

Make various pointers const in Zend/ (#10608)

* Zend/zend_operators: pass const pointers to zend_is_identical()

* Zend/zend_operators: pass const pointers to zend_get_{long,double}()

* Zend/Optimizer/sccp: make pointers const

* Zend/Optimizer/scdf: make pointers const

* Zend/Optimizer/zend_worklist: make pointers const

* Zend/Optimizer/zend_optimizer: make pointers const

* Zend/zend_compile: make pointers const

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Revert GH-10279

Cf. <https://github.com/php/php-src/pull/10220#issuecomment-1383739816>.

This reverts commit 45a128c9de93bf60956102d85d15f1fe8913bb70.
This reverts commit 1eb71c

Revert GH-10279

Cf. <https://github.com/php/php-src/pull/10220#issuecomment-1383739816>.

This reverts commit 45a128c9de93bf60956102d85d15f1fe8913bb70.
This reverts commit 1eb71c3f155a42ad6867cd5e2f6d921a99506a37.
This reverts commit 492523a779dced91eb09215183287e0856b693bf.
This reverts commit c7a4633891392d16d40b08135598807b3f0443b0.
This reverts commit 308adb915c1b659ab377f752fb27b408a455d7ed.
This reverts commit cd27d5e07f01172ac8a701996d260a731489d856.
This reverts commit c5933409b47bea760977cf9c9ea04cbb63aaafe5.
This reverts commit 46371f4eb339f7e7615a8732d61f2369f8d9129e.
This reverts commit 623e2e9fc6a23b8eb7f22010eaf99bf6f638917d.
This reverts commit e7434c124772c05fe836832e02196d50bec10c23.
This reverts commit d28d323ca20976ed776171330b90588cc3857dd6.
This reverts commit 1a067b84ee423a6fb06a5debd92b4cafefeac4e4.
This reverts commit a55c0c5fc3f624a685f42281df26cf87f445be43.
This reverts commit b5aeb3a4d40dbf38da65975d12b9d2c593b83bdd.
This reverts commit f061a035e44d3f6bbc71774f2101525d74fbf16f.
This reverts commit b088575119b3244a4d08f6a300251111a221c66b.
This reverts commit b1d48774a79592e7fb1ba85d3a2bd6717f25acec.
This reverts commit 94f9a20ce6451b54e8346cc474de6b4f9b8897a4.
This reverts commit 4831e48708e19346ace0fa5f3f085ee8afd43267.
This reverts commit cd985de190534c8e3567a4c5547eb98c45337fa0.
This reverts commit 9521d21681b22a471f21b3c56e32b883acac3301.
This reverts commit d6136151e9f7fc40e753ac0ebe1790e0d0371b6b.

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Zend/Optimizer/zend_optimizer: include cleanup

Save previous observer on the VM stack

This avoids a possible significant performance penalty, when some leaf function was observed, deep in the stack.
As a side effect, we are not itera

Save previous observer on the VM stack

This avoids a possible significant performance penalty, when some leaf function was observed, deep in the stack.
As a side effect, we are not iterating over prev_execute_data anymore and thus, non-observed fake frames, possibly on stack, cannot have any impact on the observer anymore (especially within zend_observer_fcall_end_all).

Saving the previous observer happens now directly on the VM stack. If there is any observer, function frames are allocated an extra zval (the last temporary), which will, on observed frames, contain the previous observed frame address.

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Merge branch 'PHP-8.1'

Merge branch 'PHP-8.1'

* PHP-8.1:
Fix ISSET_ISEMPTY_VAR missoptimization

Fix ISSET_ISEMPTY_VAR missoptimization

This fixes oss-fuzz #46909

Merge branch 'PHP-8.1'

* PHP-8.1:
Reorder optimization passes to avoid miss-optimization

Merge branch 'PHP-8.0' into PHP-8.1

* PHP-8.0:
Reorder optimization passes to avoid miss-optimization

Remove JMPZNZ opcode

While JMPZNZ can avoid execution of a separate JMP opcode in some
cases, it also prevents smart branch optimization, so creating
JMPZNZ may actually have a negat

Remove JMPZNZ opcode

While JMPZNZ can avoid execution of a separate JMP opcode in some
cases, it also prevents smart branch optimization, so creating
JMPZNZ may actually have a negative effect. It also adds additional
complexity for optimizations.

Drop JMPZNZ in favor of JMPZ+JMP or JMPNZ+JMP.

Closes GH-7857.

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Add helper for convertion to CHECK_VAR/FREE/NOP

This is a recurring pattern whenever an instruction with an
operand is deleted.

Skip abstract methods

Make sure SCCP can evaluate all functions pass1 can

Move evaluation of ini_get() into eval_special_func_call() and
use this helper both in pass1 and sccp.

Extract special function evaluation from pass1

Pass1 handles a number of special functions that can be evaluated
under some circumstances. Move the core logic into a separate
helper,

Extract special function evaluation from pass1

Pass1 handles a number of special functions that can be evaluated
under some circumstances. Move the core logic into a separate
helper, as I believe that SCCP should reuse this.

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Reuse get_class_entry_from_op1() helper

Export and reuse this helper in places that fetch a class entry
from op1.

Sink op_array scope case into get_class_entry()

This handles references to the current class through its name
rather than self (and for cases where is is not linked yet and
thus not

Sink op_array scope case into get_class_entry()

This handles references to the current class through its name
rather than self (and for cases where is is not linked yet and
thus not covered by the context lookup). Rather than handling this
only for FETCH_CLASS_CONSTANT optimization, integrate this into
the generic get_class_entry() utility.

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