php控制结构语句declare中的tick的详解

1

declare

(directive)

2

statement

01

<?php

02

function

doTicks
()

03

{

04

echo

'Ticks'

;

05

}

06

register_tick_function(

'doTicks'

);

07

declare

(ticks
= 1) {

08

for

(

$x

=
1;

$x

<
10; ++

$x

)
{

09

echo

$x

*

$x

.

'<br
/>'

;

10

}

11

}

12

?>

01

1

02

TicksTicks4

03

TicksTicks9

04

TicksTicks16

05

TicksTicks25

06

TicksTicks36

07

TicksTicks49

08

TicksTicks64

09

TicksTicks81

10

TicksTicksTicksTicks

1

A
tick is an event that occurs

for

every
N low-level statements executed by the parser within the

declare

block.
The value

for

N
is specified using ticks=N within the

declare

blocks's
directive section.

2

The
event(s) that occur on each tick are specified using the register_tick_function().

01

1:
<?php

02

0
NOP

03

2:

04

3:

function

doTicks
()

05

4:
{

06

5: 

echo

'Ticks'

;

07

0

ECHO

'Ticks'

08

6:
}

09

1
RETURNnull

10

7:
register_tick_function(

'doTicks'

);

11

1
SEND_VAL

'doTicks'

12

2
DO_FCALL

'register_tick_function'

[extval:1]

13

8:

declare

(ticks
= 1) {

14

9: 

for

(

$x

=
1;

$x

<
10; ++

$x

)
{

15

3
ASSIGN!0, 1

16

4
IS_SMALLER!0, 10 =>RES[~2] 

17

5
JMPZNZ~2, ->14 [extval:8]

18

6
PRE_INC !0

19

7
JMP ->4

20

10: 

echo

$x

*

$x

.

'<br
/>'

;

21

8
MUL !0, !0 =>RES[~4] 

22

9
CONCAT~4, 

'<br
/>'

=>RES[~5] 

23

10

ECHO

~5

24

11
TICKS 1 =>RES[] 

25

11:
}

26

12
TICKS 1 =>RES[] 

27

13
JMP ->6

28

14
TICKS 1 =>RES[] 

29

12:
}

30

15
TICKS 1 =>RES[] 

31

16
RETURN1

01

statement:

02

unticked_statement
{zend_do_ticks(TSRMLS_C); }

03

|
...

04

;

05

function_declaration_statement:

06

unticked_function_declaration_statement
{zend_do_ticks(TSRMLS_C); }

07

;

08

class_declaration_statement:

09

unticked_class_declaration_statement
{zend_do_ticks(TSRMLS_C); }

10

;

1

unticked_function_declaration_statement:

2

function

is_reference
T_STRING {zend_do_begin_function_declaration(&

$1

,
&

$3

,
0,

$2

.op_type,
NULL TSRMLS_CC);}

3

'('

parameter_list

')'

'{'

inner_statement_list

'}'

{
zend_do_end_function_declaration(&

$1

TSRMLS_CC);
}

4

;

01

unticked_class_declaration_statement:

02

class_entry_type
T_STRING extends_from

03

{
zend_do_begin_class_declaration(&

$1

,
&

$2

,
&

$3

TSRMLS_CC);
}

04

implements_list

05

'{'

06

class_statement_list

07

'}'

{
zend_do_end_class_declaration(&

$1

,
&

$2

TSRMLS_CC);
}

08

|
interface_entry T_STRING

09

{
zend_do_begin_class_declaration(&

$1

,
&

$2

,
NULL TSRMLS_CC);}

10

interface_extends_list

11

'{'

12

class_statement_list

13

'}'

{
zend_do_end_class_declaration(&

$1

,
&

$2

TSRMLS_CC);
}

14

;

01

unticked_statement:

02

'{'

inner_statement_list

'}'

03

|
T_IF

'('

expr

')'

{
zend_do_if_cond(&

$3

,
&

$4

TSRMLS_CC);
} statement {zend_do_if_after_statement(&

$4

,
1 TSRMLS_CC);} elseif_list else_single {zend_do_if_end(TSRMLS_C); }

04

|
T_IF

'('

expr

')'

':'

{
zend_do_if_cond(&

$3

,
&

$4

TSRMLS_CC);
} inner_statement_list{zend_do_if_after_statement(&

$4

,
1 TSRMLS_CC);} new_elseif_list new_else_single T_ENDIF

';'

{
zend_do_if_end(TSRMLS_C); }

05

|
T_WHILE

'('

{

$1

.u.opline_num
= get_next_op_number(CG(active_op_array));} expr

')'

{
zend_do_while_cond(&

$4

,
&

$5

TSRMLS_CC);
} while_statement {zend_do_while_end(&

$1

,
&

$5

TSRMLS_CC);
}

06

|
T_DO {

$1

.u.opline_num
= get_next_op_number(CG(active_op_array));zend_do_do_while_begin(TSRMLS_C); } statement T_WHILE 

'('

{

$5

.u.opline_num
= get_next_op_number(CG(active_op_array)); } expr

')'

';'

{
zend_do_do_while_end(&

$1

,
&

$5

,
&

$7

TSRMLS_CC);
}

07

|
T_FOR

08

'('

09

for_expr

10

';'

{
zend_do_free(&

$3

TSRMLS_CC);

$4

.u.opline_num
= get_next_op_number(CG(active_op_array)); }

11

for_expr

12

';'

{
zend_do_extended_info(TSRMLS_C); zend_do_for_cond(&

$6

,
&

$7

TSRMLS_CC);
}

13

for_expr

14

')'

{
zend_do_free(&

$9

TSRMLS_CC);
zend_do_for_before_statement(&

$4

,
&

$7

TSRMLS_CC);
}

15

for_statement
{zend_do_for_end(&

$7

TSRMLS_CC);
}

16

|
T_SWITCH

'('

expr

')'

{
zend_do_switch_cond(&

$3

TSRMLS_CC);
} switch_case_list {zend_do_switch_end(&

$6

TSRMLS_CC);
}

17

|
T_BREAK

';'

{
zend_do_brk_cont(ZEND_BRK, NULL TSRMLS_CC);}

18

|
T_BREAKexpr

';'

{
zend_do_brk_cont(ZEND_BRK, &

$2

TSRMLS_CC);
}

19

|
T_CONTINUE

';'

{
zend_do_brk_cont(ZEND_CONT, NULL TSRMLS_CC);}

20

|
T_CONTINUEexpr

';'

{
zend_do_brk_cont(ZEND_CONT, &

$2

TSRMLS_CC);
}

21

|
T_RETURN

';'

{
zend_do_return(NULL, 0 TSRMLS_CC);}

22

|
T_RETURNexpr_without_variable 

';'

{
zend_do_return(&

$2

,
0 TSRMLS_CC);}

23

|
T_RETURNvariable 

';'

{
zend_do_return(&

$2

,
1 TSRMLS_CC);}

24

|
T_GLOBAL global_var_list

';'

25

|
T_STATIC static_var_list

';'

26

|
T_ECHO echo_expr_list

';'

27

|
T_INLINE_HTML {zend_do_echo(&

$1

TSRMLS_CC);
}

28

|
expr

';'

{
zend_do_free(&

$1

TSRMLS_CC);
}

29

|
T_UNSET

'('

unset_variables

')'

';'

30

|
T_FOREACH 

'('

variable
T_AS

31

{
zend_do_foreach_begin(&

$1

,
&

$2

,
&

$3

,
&

$4

,
1 TSRMLS_CC);}

32

foreach_variable
foreach_optional_arg

')'

{
zend_do_foreach_cont(&

$1

,
&

$2

,
&

$4

,
&

$6

,
&

$7

TSRMLS_CC);
}

33

foreach_statement
{zend_do_foreach_end(&

$1

,
&

$4

TSRMLS_CC);
}

34

|
T_FOREACH 

'('

expr_without_variable
T_AS

35

{
zend_do_foreach_begin(&

$1

,
&

$2

,
&

$3

,
&

$4

,
0 TSRMLS_CC);}

36

variable
foreach_optional_arg

')'

{
zend_check_writable_variable(&

$6

);
zend_do_foreach_cont(&

$1

,
&

$2

,
&

$4

,
&

$6

,
&

$7

TSRMLS_CC);
}

37

foreach_statement
{zend_do_foreach_end(&

$1

,
&

$4

TSRMLS_CC);
}

38

|
T_DECLARE {

$1

.u.opline_num
= get_next_op_number(CG(active_op_array)); zend_do_declare_begin(TSRMLS_C); }

'('

declare_list

')'

declare_statement
{zend_do_declare_end(&

$1

TSRMLS_CC);
}

39

|

';'

/*
empty statement */

40

|
T_TRY {zend_do_try(&

$1

TSRMLS_CC);
} 

'{'

inner_statement_list

'}'

41

T_CATCH

'('

{
zend_initialize_try_catch_element(&

$1

TSRMLS_CC);
}

42

fully_qualified_class_name
{zend_do_first_catch(&

$7

TSRMLS_CC);
}

43

T_VARIABLE

')'

{
zend_do_begin_catch(&

$1

,
&

$9

,
&

$11

,
&

$7

TSRMLS_CC);
}

44

'{'

inner_statement_list

'}'

{
zend_do_end_catch(&

$1

TSRMLS_CC);
}

45

additional_catches
{zend_do_mark_last_catch(&

$7

,
&

$18

TSRMLS_CC);
}

46

|
T_THROW expr

';'

{
zend_do_throw(&

$2

TSRMLS_CC);
}

47

|
T_GOTO T_STRING

';'

{
zend_do_goto(&

$2

TSRMLS_CC);
}

48

;