Extend CAL_FLAGS from 8-bit to 16-bit

Eliminated checks for (func->op_array.fn_flags & ZEND_ACC_GENERATOR) in fast path of DO_FCALL* handlers.
This slightly improves calls to regular function and method calls in cost of a bit slower

Eliminated checks for (func->op_array.fn_flags & ZEND_ACC_GENERATOR) in fast path of DO_FCALL* handlers.
This slightly improves calls to regular function and method calls in cost of a bit slower generator initialization.
Separate call frame for generators, allocated on heap, now created by ZEND_GENERATOR_CREATE instruction.

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Implement nullable return types.

add compiler option to disable builtins (special case function calls)

Fixed breaks of strict-aliasing rules

Don't initialize EX(call)->symbol_table on each function call.
Keep it uninitialized, and check ZEND_CALL_HAS_SYMBOL_TABLE flag when necessary.

allow null coalescing (??) on constant expressions

Use DO_FCALL_BY_NAME instead of DO_FCALL, if possible

Merge zend_execute_data->called_scope into zend_execute_data->This.
"called_scope" made sense only for static method calls, for dynamic calls it was always equal to the class of $this.
Now EG

Merge zend_execute_data->called_scope into zend_execute_data->This.
"called_scope" made sense only for static method calls, for dynamic calls it was always equal to the class of $this.
Now EG(This) may store IS_OBJECT + $this or IS_UNUSED + "called_scope" (of course, "called_scope" may be NULL).
Some code might need to be adopted to support this change.
Checks (Z_OBJ(EX(This))) might need to be converted into (Z_TYPE(EX(This)) == IS_OBJECT).

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Use CALL_INFO flag to check if we need to destroy symbol_table.
This saves one memory load on most RETURN opcodes.

Warn about invalid strings in arithmetic

Squashed commit of the following:

commit e05d3b67325d4521418483ed924ac9211a188919
Author: Andrea Faulds <ajf@ajf.me>
Date: Wed Mar

Warn about invalid strings in arithmetic

Squashed commit of the following:

commit e05d3b67325d4521418483ed924ac9211a188919
Author: Andrea Faulds <ajf@ajf.me>
Date: Wed Mar 30 01:43:35 2016 +0100

UPGRADING and NEWS

commit 6caf1d4585207d1b02fb06a216cd7da1a1f5e12d
Author: Andrea Faulds <ajf@ajf.me>
Date: Sun Mar 20 21:18:33 2016 +0000

Fixes

commit 6dadb1b0efe5e2ed071e95a55c806519e61377ac
Author: Andrea Faulds <ajf@ajf.me>
Date: Sun Feb 14 02:15:01 2016 +0000

Add test for numeric string errors in assignment

commit bd5f04e8dd576f92a48d25546f4f9a0f57f374de
Author: Andrea Faulds <ajf@ajf.me>
Date: Sat Feb 13 23:53:05 2016 +0000

Add test for numeric string errors

commit c72e92f16d512bcae30cc9639c89bcb08d971742
Author: Andrea Faulds <ajf@ajf.me>
Date: Tue Jan 26 23:28:33 2016 +0000

Add test for scientific notation in integer operations

commit d94c08852d405b3a7ef6c84d24bf7915c890ce78
Author: Andrea Faulds <ajf@ajf.me>
Date: Sun Feb 14 01:25:57 2016 +0000

Disable optimiser evaluation for numeric string errors

commit 30ee954ed13d933e766c68605d683c8ebae3d8ee
Author: Andrea Faulds <ajf@ajf.me>
Date: Sun Feb 14 01:46:25 2016 +0000

fixup

commit a6403b79e054c95e2b7345d787f3092b261eed27
Author: Andrea Faulds <ajf@ajf.me>
Date: Sat Feb 13 22:00:27 2016 +0000

Do not convert error-causing numeric strings ahead-of-time

commit f9dc35401471ef3035954cb6f171826769297548
Author: Andrea Faulds <ajf@ajf.me>
Date: Sat Feb 13 19:15:38 2016 +0000

Disable compile-time evaluation for numeric string errors

commit e05b0cc8496ea082c6db27efd8b8277ef1f785b5
Author: Andrea Faulds <ajf@ajf.me>
Date: Fri Feb 5 11:42:26 2016 +0000

Make _zval_get_long_func_noisy function for inlining

commit 84d66321a57e579759109650c8bb7e3d5002854a
Author: Andrea Faulds <ajf@ajf.me>
Date: Tue Jan 26 23:10:00 2016 +0000

Update tests

commit 5ac4a0cc4bff282e3a15eaa8ab44b67391881a6d
Author: Andrea Faulds <ajf@ajf.me>
Date: Tue Jan 26 22:08:19 2016 +0000

Use is_numeric_string_ex for zval_get_long etc.

commit c21f08848533723331012a62a153de3577731d6a
Author: Andrea Faulds <ajf@ajf.me>
Date: Thu Jan 7 21:13:04 2016 +0000

Update tests

commit 63e214cf8160420bfc51c6a2b4ae32f09ad8e8af
Author: Andrea Faulds <ajf@ajf.me>
Date: Wed Jan 6 00:28:01 2016 +0000

Warn on non-/bad numeric strings in arithmetic

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Remove some dead defines

Drop some dead defines

Remove ZEND_CALL_CTOR_RESULT_UNUSED

Instead emit a FREE on the result of NEW.

Remove EXT_TYPE_UNUSED in favor of IS_UNUSED

This means we no longer allocate an unused VAR for the retval of
instructions that support unused results.

Nearly all instructions a

Remove EXT_TYPE_UNUSED in favor of IS_UNUSED

This means we no longer allocate an unused VAR for the retval of
instructions that support unused results.

Nearly all instructions already used the result variable only if
it was used. The only exception to this was the return value
variable for internal function call results. I've adjusted the code
to use a stack zval for the unused return case now. As we have
retval specialization now, we know that it doesn't matter.

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Introduced BIND_STATIC opcode instead of FETCH_R/FETCH_W(static)+ASSIGN/ASSIGN_REF (similar to BIND_GLOBAL).
In the future we may refer to static variable by index instead of name, to eliminate h

Introduced BIND_STATIC opcode instead of FETCH_R/FETCH_W(static)+ASSIGN/ASSIGN_REF (similar to BIND_GLOBAL).
In the future we may refer to static variable by index instead of name, to eliminate hash lookup.

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bump year which is missed in rev 49493a2

bump year which is missed in rev 49493a2

Introduce BIND_LEXICAL

This opcodes inserts a local CV into the closure static variable
table. This replaces the previous mechanism of having static
variables marked as LEXICAL, whic

Introduce BIND_LEXICAL

This opcodes inserts a local CV into the closure static variable
table. This replaces the previous mechanism of having static
variables marked as LEXICAL, which perform a symtable lookup
during copying.

This means a) functions which contain closures no longer have to
rebuild their symtable (better performance) and b) we can now track
used variables in SSA.

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Remove mentions of "type hint" and "typehint"

Remove BP_VAR_REF

The distinction between BP_VAR_REF and BP_VAR_W is no longer
revelant, since we dropped support for =& new.

Remove FETCH_STATIC_MEMBER flag

Implemented the RFC `Support Class Constant Visibility`.

Squashed commit of the following:

commit f11ca0e7a57793fa0e3e7f6d451720e6c42bb0b9
Author: Dmitry Stogov <dmitry@zend.com

Implemented the RFC `Support Class Constant Visibility`.

Squashed commit of the following:

commit f11ca0e7a57793fa0e3e7f6d451720e6c42bb0b9
Author: Dmitry Stogov <dmitry@zend.com>
Date: Tue Dec 8 12:38:42 2015 +0300

Fixed test expectation

commit 211f873f542504d0a0f72b6b5cb23908a1c99a2d
Author: Dmitry Stogov <dmitry@zend.com>
Date: Tue Dec 8 12:28:38 2015 +0300

Embed zend_class_constant.flags into zend_class_constants.value.u2.access_flags

commit 51deab84b2cdbf9cdb1a838cf33b2ee45c61748b
Author: Dmitry Stogov <dmitry@zend.com>
Date: Mon Dec 7 11:18:55 2015 +0300

Fixed issues found by Nikita

commit 544dbd5b47e40d38a8ccb96bc5583e9cb7fdd723
Author: Dmitry Stogov <dmitry@zend.com>
Date: Sat Dec 5 02:41:05 2015 +0300

Refactored immplementation of https://wiki.php.net/rfc/class_const_visibility
@reeze created an RFC here and I emailed internals here and didn't get any responses positive/negative.

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Fixed signed/unsigned mismatch

Don't undo/redo "pass two" for jump targets in opcache optimizer.