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

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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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 incorrect match default branch optimization

Fixes GH-11134
Closes GH-11135

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

Fix memory leak

Fixes oss-fuzz #52999

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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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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Fix delayed early binding with optimization

It's possible for delayed early binding opcodes to get optimized
away if they are "unreachable". However, we still need to attempt
early b

Fix delayed early binding with optimization

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.

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Fix incorrect use chain unlink

This issue has been introduced in 87ea3c1f4c174b8d66af9d42e8387a2016c21c54,
where an || has been misinterpreted as an &&.

Check against FAILURE instead of different then SUCCESS

Voidify zend_ssa_unlink_use_chain()

It always returned 1 or threw an assertion failure

Also drop else branch by moving it to the main scope

Voidify zend_ssa_compute_use_def_chains()

It always returned SUCCESS

Voidify zend_ssa_find_false_dependencies()

It always returned SUCCESS

Voidify zend_ssa_find_sccs()

It always returned SUCCESS

Voidify zend_cfg_identify_loops()

It always returned SUCCESS

Voidify zend_cfg_compute_dominators_tree()

It always returned SUCCESS

Voidify zend_cfg_build_predecessors()

It always returned SUCCESS

Voidify zend_build_cfg()

It always returned SUCCESS

Use more appropriate types in Optimizer

Mainly using zend_result and bool instead of int