Always load EX(opline) into the current frame in JIT when observers are enabled

Fixes #13772.
Closes #13776.

Add next handler parameter to zend_observer_remove_begin/end_handler (#13807)

The usage of the current API within an observer handler leads to bugs like https://bugs.xdebug.org/view.php?id=2

Add next handler parameter to zend_observer_remove_begin/end_handler (#13807)

The usage of the current API within an observer handler leads to bugs like https://bugs.xdebug.org/view.php?id=2232.
Given two observer handlers, next to each other. The first one is executed. It removes itself. The second observer handler gets moved to the place of the first. The first one returns. The handler in the second slot is fetched, but is now NULL, because the it's now in the slot of the first observer; i.e. the second handler is skipped and the begin/end symmetry guarantee is violated.

Providing the next handler to the caller is a zero-cost way to avoid any impact in the paths of zend_observe_fcall_begin/end.

Signed-off-by: Bob Weinand <bobwei9@hotmail.com>

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Add test, fix x86 JIT

Signed-off-by: Bob Weinand <bobwei9@hotmail.com>

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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Add an API to observe functions and classes being linked

To observe when the functions and classes start being officially available to the user

Signed-off-by: Bob Weinand <bobwei9@h

Add an API to observe functions and classes being linked

To observe when the functions and classes start being officially available to the user

Signed-off-by: Bob Weinand <bobwei9@hotmail.com>

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Fix ZEND_RC_DEBUG build in zend_test observer tests

Fix observer test

Include internal functions in the observer API

There are two main motivations to this:
a) The logic for handling internal and userland observation can be unified.
b) Unwinding of obs

Include internal functions in the observer API

There are two main motivations to this:
a) The logic for handling internal and userland observation can be unified.
b) Unwinding of observed functions on a bailout does notably not include observers. Even if users of observers were to ensure such handling themselves, it would be impossible to retain the relative ordering - either the user has to unwind all internal observed frames before the automatic unwinding (zend_observer_fcall_end_all) or afterwards, but not properly interleaved.

Signed-off-by: Bob Weinand <bobwei9@hotmail.com>

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Fix memory_leak in zend_test

Properly use globals init/shutdown to allocate the observer_observe_function_names hashtable instead of attempting to do everything in the ini changed handler

Add an API to manipulate observers at runtime

Signed-off-by: Bob Weinand <bobwei9@hotmail.com>

Release observed function name table

Merge remote-tracking branch 'origin/PHP-8.0' into PHP-8.1

more fiber notifications (#7293)

Flexible fiber bailout handling (#7163)

Reorganize zend_test and add custom fiber implementation tests (#7137)