Avoid op_num = -1 in unfinished generator cleanup

Also add two tests showing that the -1 substraction in the
computation of op_num is really necessary.

Load/restore VM stack before unfinished generator cleanup

Fix generator memory leak

Make sure HANDLE_EXCEPTION and generator unwinds stay in sync in
the future by extracting a common function.

Get rid of more ZVAL_ZVAL() macros

Avoid zval duplication in ZVAL_ZVAL() macro (it was necessary only in few places).
Switch from ZVAL_ZVAL() to simpler macros where possible (it makes sense to review remaining places)

Fix bug #69740

Fix memleak in generators using symtable

Fixed $this release

Fix yield from with iterator (first element missing)

Fix memory error when throwing into a generator

throw_exception_internal will access opline+1, which is not always
defined at the current opline of the generator. To avoid this
decre

Fix memory error when throwing into a generator

throw_exception_internal will access opline+1, which is not always
defined at the current opline of the generator. To avoid this
decrement the opline before throwing (so the throw occurs at the
YIELD opcode instead of one after it).

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Mark call frames to closures with ZEND_CALL_CLOSURE flag to avoid expensive check at zend_leave_helper()

Fix object leak for yield from (added proper refcounting)

Fix leak of closure used as generator

Also remove obsolete code for copying the closure op_array. It
should no longer be possible for the closure object to be destroyed
while the gen

Fix leak of closure used as generator

Also remove obsolete code for copying the closure op_array. It
should no longer be possible for the closure object to be destroyed
while the generator is still live.

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Convert fatal error into EngineException

Use zend_error_noreturn() for fatal errors

Implement Generator::getReturn()

Conflicts:
Zend/zend_vm_execute.h

Fixed bug #69221

A generator iterator can be created from different zvals - use
the object handle to manage references instead.

Errors converted to exceptions are not "recoverable" anymore.

Implement engine exceptions

RFC: https://wiki.php.net/rfc/engine_exceptions_for_php7

Pending changes regarding naming of BaseException and whether it
should be an interface.

Added yield from operator

WIP

don't count op_arrays stored in opcache SHM

Implement Generator::getReturn()

Fix "forech" statemt behaviour according to https://wiki.php.net/rfc/php7_foreach

Squashed commit of the following:

commit 1e41295097576dbce6c197ddb7507c07ccae3cbe
Author: Dmitr

Fix "forech" statemt behaviour according to https://wiki.php.net/rfc/php7_foreach

Squashed commit of the following:

commit 1e41295097576dbce6c197ddb7507c07ccae3cbe
Author: Dmitry Stogov <dmitry@zend.com>
Date: Sat Jan 31 07:28:58 2015 +0300

Generalize HashTableIterator API to allows its usage without involvement of HashTable.nInternalPonter

commit 5406f21b11e563069d64045e599693b51c444b63
Author: Dmitry Stogov <dmitry@zend.com>
Date: Fri Jan 30 18:08:43 2015 +0300

Reduced alghorithms complexity

commit b37f1d58d2a141b6e1d980a461ccb588d4317d2e
Author: Dmitry Stogov <dmitry@zend.com>
Date: Fri Jan 30 18:08:30 2015 +0300

Fixed test name

commit fb2d079645829b12ed4e55a461034df6400bc430
Author: Dmitry Stogov <dmitry@zend.com>
Date: Fri Jan 30 18:08:05 2015 +0300

API cleanup

commit 08302c0d6d1cab279b9f2129df03a057baddf2ff
Author: Dmitry Stogov <dmitry@zend.com>
Date: Fri Jan 30 14:20:46 2015 +0300

Make array_splice() to preserve foreach hash position

commit cc4b7be41e2e2b9b0d7a3c8e98466b8886692e6e
Author: Dmitry Stogov <dmitry@zend.com>
Date: Fri Jan 30 12:24:31 2015 +0300

Make internal function, operation on array passed by reference, to preserve foreach hash position

commit 5aa9712b0a30303aadfe3bdd8ae1f072ca3e6ba1
Author: Dmitry Stogov <dmitry@zend.com>
Date: Fri Jan 30 09:49:35 2015 +0300

Implement consistent behavior for foreach by value over plain object

commit 4c5b385ff53ae9f0b52572e98c4db801f56603b0
Author: Dmitry Stogov <dmitry@zend.com>
Date: Fri Jan 30 07:56:37 2015 +0300

More careful iterators update.

commit 721fc9e80d2ee8f2cd79c8c3cdceffae2c72de92
Author: Dmitry Stogov <dmitry@zend.com>
Date: Thu Jan 29 21:43:28 2015 +0300

Added new test

commit 15a23b1218b3e38630d677751a975907daa2cd54
Author: Dmitry Stogov <dmitry@zend.com>
Date: Thu Jan 29 21:05:02 2015 +0300

Reimplement iteration magic with HashTableIterators (see https://wiki.php.net/rfc/php7_foreach#implementation_details)

commit 10a3260b1f16b6075fd8140f673dfef4d5efea91
Author: Dmitry Stogov <dmitry@zend.com>
Date: Thu Jan 29 21:04:44 2015 +0300

New test

commit eef80c583762d1e98d177cdbb27e3a8a6b0c4539
Author: Dmitry Stogov <dmitry@zend.com>
Date: Wed Jan 28 16:52:21 2015 +0300

Fixed foreach by reference iteration over constant array

commit 61e739187391661e2d541947bec25d7dcc4479f3
Author: Dmitry Stogov <dmitry@zend.com>
Date: Wed Jan 28 14:59:54 2015 +0300

Fixed temporary variable re-allocation pass

commit 92e90c09f085c22707ff4a59201f016f56e0ef8b
Author: Dmitry Stogov <dmitry@zend.com>
Date: Wed Jan 28 12:44:57 2015 +0300

Fixed operand destruction in case of exceptions in iterator

commit dd2a36a2074bbb0cb31de00b66dcf2812d6d753f
Author: Dmitry Stogov <dmitry@zend.com>
Date: Wed Jan 28 10:02:34 2015 +0300

Use GET_OP1_ZVAL_PTR_DEREF() (IS_TMP_VAR and IS_CONST can't be IS_REFERENCE)

commit 4638f7b91407c48710007af82a68da0007c820f2
Author: Dmitry Stogov <dmitry@zend.com>
Date: Wed Jan 28 07:43:28 2015 +0300

Change "foreach" statement behavior (this is just a PoC yet)

- "foreach by value" don't relay on internal array/object pointer and doesnt perform array duplication. It just locks it incrementing reference counter. If the original array is modified by some code, the copy on write is performed and "foreach" still work with the old copy.

- it makes no difference if array given to "foreach by value" is reference itself

- "foreach by reference" still use internal array/object pointer and should work similar to PHP-5. (This id not completely implemented)

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bump year