Allow CALL executor to keep few very often used vaiables in CPU registers.
This is disabled by default yet, but may be enabled compiling zend_execute.c with -DHAVE_GCC_GLOBAL_REGS.
Only teste

Allow CALL executor to keep few very often used vaiables in CPU registers.
This is disabled by default yet, but may be enabled compiling zend_execute.c with -DHAVE_GCC_GLOBAL_REGS.
Only tested on Linux x86 and x86_64 with GCC 4.9.2.

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Executor cleanup: fix GOTO and SWITCH VMs, remove aility to build additional PHP-5.0 compatible VM, hide executor implementation details.

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.

Reduced initial VM_STACK page size of Generators to 4 KB (256 slots)
Generators all have their own vm_stack, but usually don't go really deep.
In most cases even most of the 4 KB will remain

Reduced initial VM_STACK page size of Generators to 4 KB (256 slots)
Generators all have their own vm_stack, but usually don't go really deep.
In most cases even most of the 4 KB will remain unused (in my tests average is rather 1 KB), but this was tested a straightforward implementation without a lot of abstraction layers.
That way I'm using a more conservative 4 KB stack size which really should be enough for, I think, at least 90% of the cases.
This was necessary to not immediately run out of memory with 95%+ usused vm_stack space: If you have a few thousands of Generators active, your application quickly hits memory_limit with a stack page size of 256 KB...
In addition, it's also a bit faster (70% less instructions for zend_vm_stack_new_page) due to emalloc() not having to allocate a whole new segment (segment size 256 KB). Also no mmap()/malloc() necessary.

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Added yield from operator

Don't inline helpers for ArrayAccess objects

WIP

Fixed compilation warnings

Added specialized versions of DO_FCALL handler:
DO_ICALL - for internal functions
DO_UCALL - for user functions
DO_FCALL_BY_NAME - plain, most probably user, funcstions (not methods)

Use cache_slot offsets instead of indexes (simplify run-time instructions)

Make zend_array_destroy() to free the corresponding zend_array

Lazy duplication of op_array->static_variables

Merged zend_array and HashTable into the single data structure.
Now each HashTable is also zend_array, so it's refcounted and may be a subject for Copy on Write
zend_array_dup() was changed t

Merged zend_array and HashTable into the single data structure.
Now each HashTable is also zend_array, so it's refcounted and may be a subject for Copy on Write
zend_array_dup() was changed to allocate and return HashTable, instead of taking preallocated HashTable as argument.

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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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Fixed use after free on the following code

sapi/cli/php -r 'function hello(string $world) : string { var_dump(bin2hex($world)); return $world; } echo "foo" . hello(6) . "\n";'

Implement per-file strictness for scalar return types

Implement scalar return types (strict only for now)

Partial ZPP strictness implementation

It Begins

Refactor scalar type hints implementation per Dmitry's patch

Use new names of arg parsing functions

Scalar type hints with ZPP casting rules

Implemented internal function return types

Simplify code and add comments