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.
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)).
移除 execute_data->CVs 字段。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