Implement stackless internal function calls

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

Closes GH-12461

Allow arbitrary expressions in static variable initializer

Closes GH-9301

Fix incorrect match default branch optimization

Fixes GH-11134
Closes GH-11135

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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Fix incorrect optimization of ASSIGN_OP may lead to incorrect result (sub assign -> pre dec conversion for null values)

Optimize JMP[N]Z_EX to BOOL instead of QM_ASSIGN (#10108)

&& and || should always evaluate to a boolean instead of the lhs/rhs.

This optimization never gets triggered for any of our

Optimize JMP[N]Z_EX to BOOL instead of QM_ASSIGN (#10108)

&& and || should always evaluate to a boolean instead of the lhs/rhs.

This optimization never gets triggered for any of our tests.
Additionally, even if triggered this instruction gets optimized away
because the else branch of the JMP instruction will overwrite the tmp
value.

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Fix memory leak

Fixes oss-fuzz #52999

Merge branch 'PHP-8.1'

* PHP-8.1:
Fix memory leak

Merge branch 'PHP-8.0' into PHP-8.1

* PHP-8.0:
Fix memory leak

Merge branch 'PHP-8.1'

* PHP-8.1:
Fix SSA reconstruction when body of "foreach" loop is removed

Merge branch 'PHP-8.0' into PHP-8.1

* PHP-8.0:
Fix SSA reconstruction when body of "foreach" loop is removed

Add support for Disjoint Normal Form (DNF) types (#8725)

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

This allows to combine union and intersection types together in the following form (

Add support for Disjoint Normal Form (DNF) types (#8725)

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>

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Remove custom alloca() (#8513)

* Use arena in DCE instead of multiple alloca()
This requires passing the optimizer context

* Use our do_alloca() instead of alloca()

*

Remove custom alloca() (#8513)

* Use arena in DCE instead of multiple alloca()
This requires passing the optimizer context

* Use our do_alloca() instead of alloca()

* Use emalloc in DEBUG builds instead of stack allocations for do_alloca()
This helps detecting that we correctly free do_alloca()

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Merge branch 'PHP-8.1'

* PHP-8.1:
Disable ASSIGN optimization for values inferred for fatal errors.

Disable ASSIGN optimization for values inferred for fatal errors.

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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Eliminate more VERIFY_RETURN_TYPE instructions

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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Merge branch 'PHP-8.1'

* PHP-8.1:
Fix incorrect optimization of ASSIGN_OP that may lead to memory leak

Merge branch 'PHP-8.0' into PHP-8.1

* PHP-8.0:
Fix incorrect optimization of ASSIGN_OP that may lead to memory leak

Merge branch 'PHP-8.1'

* PHP-8.1:
Fix incorrect JMP optimization

Merge branch 'PHP-8.0' into PHP-8.1

* PHP-8.0:
Fix incorrect JMP optimization

Merge branch 'PHP-8.1'

* PHP-8.1:
Fix bug #81652

Merge branch 'PHP-8.0' into PHP-8.1

* PHP-8.0:
Fix bug #81652

Merge branch 'PHP-8.1'

* PHP-8.1:
Drop pi nodes for both old/new pred in replace_predecessor