Allow an experimental VM with tail call dispatch technique (disabled by default).
This VM may work only if all tail calls are optimized, otherwaise it will crach because of stack overflow.
Un

Allow an experimental VM with tail call dispatch technique (disabled by default).
This VM may work only if all tail calls are optimized, otherwaise it will crach because of stack overflow.
Unfortunately, we can't guarantee tail call optimization in C.

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Suppressed warning -Wvolatile-register-var

Fix zend_vm_call_opcode_handler (e.g. Generators throwing exceptions) with IP/FP registers

Assign CPU registers for GOTO and SWITCH executor as well

Removed deprecated comments and added expectations (overloaded properties and array elements are less frequently used than regular ones)

Revert "Simplify ZEND_EXIT and count boolean values to it as exit status"

This reverts commit 7c003948c618adb2a6691f529057388f02202f09.

Simplify ZEND_EXIT and count boolean values to it as exit status

Fixed typo

Improve the conditions(save one comparison)

Preserve return value in zend_vm_call_opcode_handler with global opline/ex registers enabled

Hint label lookup table initialization branch on GOTO VM kind.

This initialization is performed only once so it shall be marked as unexpected.

Fixed situation, when CHECH_EXCEPTION() might change value of "opline" variable and the following "opline" useages would access elements of different opcode. That might lead to unpredictable behavior

Fixed situation, when CHECH_EXCEPTION() might change value of "opline" variable and the following "opline" useages would access elements of different opcode. That might lead to unpredictable behavior. (Only PHP-7 with GCC global register variables was affected).
CHECK_EXCEPTION() macro is removed. ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTIO() should be used instead. It's equivalent to old CHECK_EXCEPTION() + ZEND_VM_NEXT_OPCODE().
As a side effect, this also slightly improved performnce of builds with GCC >= 4.8.

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Fixed ZEND_VM_DEFINE_OP build when --without-specializer

Unused ret

Removed useless #ifdef

Make CALL VM with FP and IP in global registers not to return anything from opcode handlers.
Set OPLINE to NULL to terminate VM loop instead.
This saves 1 CPU instruction for each opcode hand

Make CALL VM with FP and IP in global registers not to return anything from opcode handlers.
Set OPLINE to NULL to terminate VM loop instead.
This saves 1 CPU instruction for each opcode handler.

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Delay checks for undefined CV variables after checks for fast paths.

Properly define ZEND_OP_DATA in zend_vm_def.h
This allows zend_vm_gen.php to define them in zend_vm_opcodes.{c,h} without further hacks.

Fixed GOTO executor

Embed "fast" operator functions (add, sub, increment, etc) into executor with additional optimizations

Exposed ZEND_VM_KIND etc

Added API function to call VM opcode handler in a portable way

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.

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.