Implemented Fiber GC handler

Co-authored-by: Martin Schröder <m.schroeder2007@gmail.com>

Rename Fiber::this() to Fiber::getCurrent()

Allocate fiber stack within try

Catch and repeat zend_bailout in fibers

This removes switching to main for fatal errors in fibers in favor of catching any zend_bailout in a fiber and calling zend_bailout again after switch

Catch and repeat zend_bailout in fibers

This removes switching to main for fatal errors in fibers in favor of catching any zend_bailout in a fiber and calling zend_bailout again after switching to the previous fiber or {main}.

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Check current_execute_data instead of flags in fiber destructor

Checking EG(current_exectue_data) throws into the previous fiber instead of triggering a fatal error during shutdown. A fatal

Check current_execute_data instead of flags in fiber destructor

Checking EG(current_exectue_data) throws into the previous fiber instead of triggering a fatal error during shutdown. A fatal error is triggered only if the throwing destroyed fiber was resumed from {main}.

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Rethrow exceptions in fiber destructor

We need to make sure that HANDLE_EXCEPTION is set when the fiber
throws during destruction.

Co-Authored-By: Nikita Popov <nikita.ppv@gmail

Rethrow exceptions in fiber destructor

We need to make sure that HANDLE_EXCEPTION is set when the fiber
throws during destruction.

Co-Authored-By: Nikita Popov <nikita.ppv@gmail.com>

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Improve fiber backtraces

Fix exception thrown during fiber destruct

Update based on php-src implementation

Generate arginfo from stubs

Allocate error on the stack

Use preallocated context

Removed just-added data pointer as this approach makes it unnecessary.

Provide fiber context to and from internal API functions

Index active fibers by ID

Few other minor nits

A few minor fixes and nits

Eliminate stack temp

Fix hidden exception from suspend in force closed fiber

(EG(flags) & EG_FLAGS_IN_SHUTDOWN) cannot be used as a replacement for FIBER_G(shutdown) because it prevents fibers being resumed in a

Fix hidden exception from suspend in force closed fiber

(EG(flags) & EG_FLAGS_IN_SHUTDOWN) cannot be used as a replacement for FIBER_G(shutdown) because it prevents fibers being resumed in a shutdown function.

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Consolodate freeing

Change timing of setting current fiber

Switch to {main} for fatal errors

Minor stylistic changes

Combine create and initialize context functions

zend_fiber_create_context had been reduced to a malloc function and felt unnecessary.

Remove stack_size property

Accessable through fiber->context->stack.size.

Remove root context