Implement debug_print_backtrace() on top of zend_fetch_backtrace()

As debug_print_backtrace() is not performance-critical, this
implements it by formatting the zend_fetch_backtrace() res

Implement debug_print_backtrace() on top of zend_fetch_backtrace()

As debug_print_backtrace() is not performance-critical, this
implements it by formatting the zend_fetch_backtrace() result.
This means there is only one place implementing the backtrace
construction logic, and they cannot go out of sync.
zend_fetch_backtrace() has much better test coverage, because
it is used by exceptions.

Closes GH-6869.

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Implement zend_print_flat_zval_r() using smart_str

Use the same implementation approach as for the non-flat
zend_print_zval_r() function.

Fix spelling and grammar mistakes

This PR corrects misspellings identified by the check-spelling action.

The misspellings have been reported at jsoref@b6ba3e2#commitcomment-48946465

Fix spelling and grammar mistakes

This PR corrects misspellings identified by the check-spelling action.

The misspellings have been reported at jsoref@b6ba3e2#commitcomment-48946465

The action reports that the changes in this PR would make it happy: jsoref@602417c

Closes GH-6822.

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Implement enums

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

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Closes GH-6489.

Change Zend Stream API to use zend_string* instead of char*.

This allows to eliminate re-calculation of string lenght and hash value.
See the detailed list of changes in UPGRADING.INTERN

Change Zend Stream API to use zend_string* instead of char*.

This allows to eliminate re-calculation of string lenght and hash value.
See the detailed list of changes in UPGRADING.INTERNALS.

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Reference dynamic functions through dynamic_defs

Currently, dynamically declared functions and closures are inserted
into the function table under a runtime definition key, and then late

Reference dynamic functions through dynamic_defs

Currently, dynamically declared functions and closures are inserted
into the function table under a runtime definition key, and then later
possibly renamed. When opcache is not used and a file containing a
closure is repeatedly included, this leads to a very large memory leak,
as the no longer needed closure declarations will never be freed
(https://bugs.php.net/bug.php?id=76982).

With this patch, dynamic functions are instead stored in a
dynamic_func_defs member on the op_array, which opcodes reference
by index. When the parent op_array is destroyed, the dynamic_func_defs
it contains are also destroyed (unless they are stilled used elsewhere,
e.g. because they have been bound, or are used by a live closure). This
resolves the fundamental part of the leak, though doesn't completely
fix it yet due to some arena allocations.

The main non-obvious change here is to static variable handling:
We can't destroy static_variables_ptr in destroy_op_array, as e.g.
that would clear the static variables in a dynamic function when
the op_array containing it is destroyed. Static variable destruction
is separated out for this reason (we already do static variable
destruction separately for normal functions, so we only need to
handle main scripts).

Closes GH-5595.

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Fix typo in warnings_during_sccp

Should be capture_warnings_during_sccp

Related to 4c088c5da7fb96380a4cfc420d272075b40b6141

Handle warnings during sccp function evaluation

Some upcoming changes like https://wiki.php.net/rfc/deprecate_null_to_scalar_internal_arg
will make it somewhat inconvenient to determine

Handle warnings during sccp function evaluation

Some upcoming changes like https://wiki.php.net/rfc/deprecate_null_to_scalar_internal_arg
will make it somewhat inconvenient to determine whether a given
function invocation will generate a diagnostic. Rather than trying
to exclude this in advance, call the function with diagnostics
suppressed, and check whether anything was thrown.

This adds a new EG flag that is kept specific to the SCCP use-case.
This does not use the error_cb hook as it is a (non-TLS) global,
and doesn't fully suppress error handling besides.

Test this by removing the in advance checks for implode and array_flip.

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Added Inheritance Cache.

This is a new transparent technology that eliminates overhead of PHP class inheritance.

PHP classes are compiled and cached (by opcahce) separately, howeve

Added Inheritance Cache.

This is a new transparent technology that eliminates overhead of PHP class inheritance.

PHP classes are compiled and cached (by opcahce) separately, however their "linking" was done at run-time - on each request. The process of "linking" may involve a number of compatibility checks and borrowing methods/properties/constants form parent and traits. This takes significant time, but the result is the same on each request.

Inheritance Cache performs "linking" for unique set of all the depending classes (parent, interfaces, traits, property types, method types involved into compatibility checks) once and stores result in opcache shared memory. As a part of the this patch, I removed limitations for immutable classes (unresolved constants, typed properties and covariant type checks). So now all classes stored in opcache are "immutable". They may be lazily loaded into process memory, if necessary, but this usually occurs just once (on first linking).

The patch shows 8% improvement on Symphony "Hello World" app.

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Move optimizer into core

This only moves the files, adjusts the build system, exports APIs
and does minor fixups to make sure the code builds.

This does not yet try to make the

Move optimizer into core

This only moves the files, adjusts the build system, exports APIs
and does minor fixups to make sure the code builds.

This does not yet try to make the optimizer usable independently
of opcache.

Closes GH-6642.

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Replace zend_bool uses with bool

We're starting to see a mix between uses of zend_bool and bool.
Replace all usages with the standard bool type everywhere.

Of course, zend_bool

Replace zend_bool uses with bool

We're starting to see a mix between uses of zend_bool and bool.
Replace all usages with the standard bool type everywhere.

Of course, zend_bool is retained as an alias.

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Restrict allowed usages of $GLOBALS

This restricts allowed usage of $GLOBALS, with the effect that
plain PHP arrays can no longer contain INDIRECT elements.

RFC: https://wiki.ph

Restrict allowed usages of $GLOBALS

This restricts allowed usage of $GLOBALS, with the effect that
plain PHP arrays can no longer contain INDIRECT elements.

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

Closes GH-6487.

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Add GC_TRY_ADDREF macro

That adds a ref if not immutable. Also audit uses of GC_IMMUTABLE
to either use GC_TRY_ADDREF or GC_TRY_PROTECT_RECURSION.

Rename zend_error_notify APIs to zend_observer_error*

Simplify error type filter

Closes GH-6049.

Add zend_observer API

Closes GH-5857.

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

Improve type declarations for Zend APIs

Voidification of Zend API which always succeeded
Use bool argument types instead of int for boolean arguments
Use bool return type for functio

Improve type declarations for Zend APIs

Voidification of Zend API which always succeeded
Use bool argument types instead of int for boolean arguments
Use bool return type for functions which return true/false (1/0)
Use zend_result return type for functions which return SUCCESS/FAILURE as they don't follow normal boolean semantics

Closes GH-6002

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Drop various unused macros/APIs

Also convert_libmagic_pattern() to return a zend_string*

Closes GH-6029

Fixed bug #79948

Make sure we don't execute further scripts if one of them encountered
an exit exception.

Also make sure that we free file handles that end up unused due to

Fixed bug #79948

Make sure we don't execute further scripts if one of them encountered
an exit exception.

Also make sure that we free file handles that end up unused due to
an early abort in php_execute_scripts(), which turned up as an
issue in the added test case.

Finally, make use of EG(exit_status) in the places where we
zend_eval_string_ex, instead of unconditionally assigning exit
code 254. If an error occurs, the error handler will already set
exit status 255.

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[RFC] Make string length for getTraceAsString() configurable

Add a `zend.exception_string_param_max_len` ini setting.
(same suffix as `log_errors_max_len`)

Allow values between

[RFC] Make string length for getTraceAsString() configurable

Add a `zend.exception_string_param_max_len` ini setting.
(same suffix as `log_errors_max_len`)

Allow values between 0 and 1000000 bytes.
For example, with zend.exception_string_param_max_len=0,
"" would represent the empty string, and "..." would represent something
longer than the empty string.
Previously, this was hardcoded as exactly 15 bytes.

Discussion: https://externals.io/message/110717

Closes GH-5769

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Fix build

MSVC is pretty picky there, so we add the `ZEND_VOIDP` cast.

Merge branch 'PHP-7.4'

* PHP-7.4:
Fix minor memory leak of CG(script_encoding_list)

Fix minor memory leak of CG(script_encoding_list)

This only leaks at the end of the process, so per se not an issue, but
the leak is caught by MSVC's CRT leak checker, so we better prope

Fix minor memory leak of CG(script_encoding_list)

This only leaks at the end of the process, so per se not an issue, but
the leak is caught by MSVC's CRT leak checker, so we better properly
clean up to avoid false positives.

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Fix warnings of strict-prototypes

Closes GH-5887.

Export zend_register_error_notify_callback() with ZEND_API