Disable "red zone" usage (it leads to crashes).

Use "red zone" for HYBRID VM.
Support for CALL VM and VM without global register variables.

Update zend_vm_gen.php with zend_vm_opcode.c/h changes

The generated files were modified directly, resulting in mysterious
build failures depending on exact build order.

Fix E_DEPRECATED in zend_vm_gen.php

explode(): Passing null to parameter #2 ($string) of type string is
deprecated

Closes GH-6698.

Avoid writing zend_vm_opcodes.h if it did not change

Now that we track header changes, a change to zend_vm_opcodes.h
requires rebuilding essentially the whole tree. In most cases,
ch

Avoid writing zend_vm_opcodes.h if it did not change

Now that we track header changes, a change to zend_vm_opcodes.h
requires rebuilding essentially the whole tree. In most cases,
changes to zend_vm_def.h don't actually result in any header
changes though.

Avoid touching the file by first checking whether the to be written
contents are actually the same.

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Coding style tweaks for zend_vm_gen.php

- fixed array style for $vm_kind_name and $op_types
- deleted unnecessary else statement for is_hot_helper function
- fixed concatenation styl

Coding style tweaks for zend_vm_gen.php

- fixed array style for $vm_kind_name and $op_types
- deleted unnecessary else statement for is_hot_helper function
- fixed concatenation style
- fixed style of using whitespace between "(" and switch/foreach - replaced !is_null with "!=="

Closes GH-6704.

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Disable stack reuse optimization for x86 PIC code. It may clobber local variable used for Global Offset Table.

Preallocate stack space for JIT in execute_ex() to eliminate JIT prologue/epilogue.

Provide unused retvals to observers

Make sure that the return value is available to observers, even if
it is not used by the caller.

Closes GH-6422.

[Observer] Save opline before calling begin/end handlers

Cleanup observer API and add JIT support

Remove specialization of SPEC(OBSERVER) handlers

Add zend_observer API

Closes GH-5857.

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>
Co-authored-by: Sammy Powers <sammyk@datadoghq.com>

SAVE_OPLINE in NULL_HANDLER

Let's avoid crashing before the nice error message gets printed...

Implement named parameters

From an engine perspective, named parameters mainly add three
concepts:

* The SEND_* opcodes now accept a CONST op2, which is the
argument nam

Implement named parameters

From an engine perspective, named parameters mainly add three
concepts:

* The SEND_* opcodes now accept a CONST op2, which is the
argument name. For now, it is looked up by linear scan and
runtime cached.
* This may leave UNDEF arguments on the stack. To avoid having
to deal with them in other places, a CHECK_UNDEF_ARGS opcode
is used to either replace them with defaults, or error.
* For variadic functions, EX(extra_named_params) are collected
and need to be freed based on ZEND_CALL_HAS_EXTRA_NAMED_PARAMS.

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

Closes GH-5357.

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Remove FREE_UNFETCHED concept

In master normal FREE_OPs work like FREE_UNFETCHED_OP used to, so
there is no point in keeping this distinction anymore, it's just
confusing.

Assert exception set in HANDLE_EXCEPTION()

Some code paths were checking this manually, but we can turn this
into a general assertion to avoid surprises (functions returning
failure

Assert exception set in HANDLE_EXCEPTION()

Some code paths were checking this manually, but we can turn this
into a general assertion to avoid surprises (functions returning
failure without throwing).

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Remove #undefs from vm_gen

Possibly these were needed for VM_EXPORT, but they don't serve a
purpose now.

Remove ZEND_VM_EXPORT functionality

This hasn't been used since forever and makes things more confusing
than they already are.

[ci skip] Various typo fixes in stub comments and CHANGES file

Prevent CGG reordering if hanlers order is defined by zend_vm_order.txt

Remove spurious const qualifier from function return type

Merge branch 'PHP-7.4'

* PHP-7.4:
Apply tidy formatting

Apply tidy formatting

Mostly reindent PHP scripts to spaces.

Support the same handler for multiple opcodes