Extensions cannot override zend_execute() any more and
should override zend_execute_ex() instead.
EG(current_execute_data) is already initialized in
zend_execute_ex(), so for compatibility extensions may
need to use
EG(current_execute_data)->prev_execute_data instead.
Removed EG(arg_types_stack),
EX(fbc), EX(called_scope) and
EX(current_object).
Added op_array->nested_calls, which is calculated
at compile time.
Added EX(call_slots), which is an array to store
information about syntaticaly nested calls (e.g.
foo(bar())) and is preallocated together with
execute_data.
Added EX(call), which is a pointer to a current
calling function, and is an element of EX(call_slots).
Added op_array->used_stack, which is calculated at
compile time; the corresponding stack space is preallocated together with
execute_data. As a result, the ZEND_SEND* and
ZEND_DO_FCALL* opcodes no longer need to check for stack overflow.
Removed execute_data->Ts field. The VM temporary
variables are always allocated immediately before the
execute_data structure, and are now accessed by their
offset from the execute_data base pointer instead of
via execute_data->Ts. The compiler stores new
offsets in op_array->opcodes[*].op?.num. The
EX_TMP_VAR() and EX_TMP_VAR_NUM()
macros can be used to access temporary variables by offset or number. You
can convert the number to an offset using EX_TMP_VAR_NUM(0,
num) or offset to number using
(EX_TMP_VAR_NUM(0,0)-EX_TMP_VAR(0,offset)).
Removed the execute_data->CVs field. The VM
compiled variables are always allocated immediately after the
execute_data structure, and are now accessed by the
offset from the execute_data base pointer instead of
via execute_data->CVs. You can use the
EX_CV_NUM() macro to access compiled variables by
number.