mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-11-17 08:38:42 +00:00
Filters are now a tiny bit stronger (if is actually working ;-)
This commit is contained in:
Pavel Machek
parent
111213f0b6
commit
b700582445
@ -25,7 +25,7 @@ CF_DECLS
|
||||
ip_addr a;
|
||||
struct symbol *s;
|
||||
char *t;
|
||||
struct f_instruction *x;
|
||||
struct f_inst *x;
|
||||
}
|
||||
|
||||
%token END
|
||||
|
||||
@ -19,7 +19,7 @@ CF_HDR
|
||||
|
||||
CF_DECLS
|
||||
|
||||
CF_KEYWORDS(FUNCTION, FILTER, PRINTDEBUG, INT, PRINT)
|
||||
CF_KEYWORDS(FUNCTION, FILTER, PRINTDEBUG, INT, PRINT, CONST, VAR, PUTS, DIE, IF)
|
||||
|
||||
%type <x> term
|
||||
%type <x> cmds
|
||||
@ -29,7 +29,7 @@ CF_GRAMMAR
|
||||
CF_ADDTO(conf, function)
|
||||
function:
|
||||
FUNCTION SYM '(' ')' '{' cmds '}' {
|
||||
extern struct f_instruction *last_func;
|
||||
extern struct f_inst *last_func;
|
||||
if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
|
||||
$2->class = SYM_FUNCTION;
|
||||
$2->def = $6;
|
||||
@ -69,13 +69,47 @@ term:
|
||||
/* EMPTY */ {
|
||||
$$ = NULL;
|
||||
}
|
||||
| term '+' term {
|
||||
$$ = f_new_inst();
|
||||
$$->code = '+';
|
||||
$$->arg1 = $1;
|
||||
$$->arg2 = $3;
|
||||
}
|
||||
| IF '(' term ')' '{' cmds '}' {
|
||||
$$ = f_new_inst();
|
||||
$$->code = '?';
|
||||
$$->arg1 = $3;
|
||||
$$->arg2 = $6;
|
||||
}
|
||||
| IF '(' term ')' term {
|
||||
$$ = f_new_inst();
|
||||
$$->code = '?';
|
||||
$$->arg1 = $3;
|
||||
$$->arg2 = $5;
|
||||
}
|
||||
| INT SYM {
|
||||
if ($2->class != SYM_VOID) cf_error("Symbol already defined, can not use as variable\n" );
|
||||
$2->class = SYM_VARIABLE_INT;
|
||||
printf( "New variable\n" );
|
||||
$$ = NULL;
|
||||
}
|
||||
| SYM '=' expr {
|
||||
| VAR '(' SYM ')' {
|
||||
$$ = f_new_inst();
|
||||
switch ($3->class) {
|
||||
case SYM_VARIABLE_INT:
|
||||
$$->code = 'i';
|
||||
$$->arg1 = &($3->aux);
|
||||
break;
|
||||
default:
|
||||
cf_error("Can not use this class of symbol as variable" );
|
||||
}
|
||||
}
|
||||
| CONST '(' expr ')' {
|
||||
$$ = f_new_inst();
|
||||
$$->code = 'c';
|
||||
$$->arg1 = $3;
|
||||
}
|
||||
| SYM '=' term {
|
||||
$$ = f_new_inst();
|
||||
printf( "Ook, we'll set value\n" );
|
||||
if ($1->class != SYM_VARIABLE_INT)
|
||||
@ -84,13 +118,22 @@ term:
|
||||
$$->arg1 = $1;
|
||||
$$->arg2 = $3;
|
||||
}
|
||||
| PRINT '(' SYM ')' {
|
||||
| PRINT '(' term ')' {
|
||||
$$ = f_new_inst();
|
||||
printf( "Ook, we'll print something\n" );
|
||||
$$->code = 'p';
|
||||
$$->arg1 = $3;
|
||||
$$->arg2 = NULL;
|
||||
}
|
||||
| PUTS '(' TEXT ')' {
|
||||
$$ = f_new_inst();
|
||||
$$->code = 'd';
|
||||
$$->arg1 = $3;
|
||||
}
|
||||
| DIE {
|
||||
$$ = f_new_inst();
|
||||
$$->code = '!';
|
||||
}
|
||||
| PRINTDEBUG {
|
||||
$$ = f_new_inst();
|
||||
$$->code = 'D';
|
||||
|
||||
@ -21,42 +21,91 @@
|
||||
#include "conf/conf.h"
|
||||
#include "filter/filter.h"
|
||||
|
||||
struct f_instruction *last_func = NULL;
|
||||
struct f_inst *last_func = NULL;
|
||||
|
||||
static void
|
||||
interpret(struct f_instruction *what)
|
||||
#define runtime die
|
||||
|
||||
static struct f_val
|
||||
interpret(struct f_inst *what)
|
||||
{
|
||||
struct symbol *sym;
|
||||
struct f_val v1, v2, res;
|
||||
|
||||
res.type = T_VOID;
|
||||
if (!what)
|
||||
return;
|
||||
return res;
|
||||
|
||||
switch(what->code) {
|
||||
case ',':
|
||||
interpret(what->arg1);
|
||||
interpret(what->arg2);
|
||||
break;
|
||||
case '+':
|
||||
v1 = interpret(what->arg1);
|
||||
v2 = interpret(what->arg2);
|
||||
if (v1.type != v2.type)
|
||||
runtime( "Can not operate with values of incompatible types" );
|
||||
|
||||
switch (res.type = v1.type) {
|
||||
case T_VOID: runtime( "Can not operate with values of type void" );
|
||||
case T_INT: res.val.i = v1.val.i + v2.val.i; break;
|
||||
default: runtime( "Usage of unknown type" );
|
||||
}
|
||||
break;
|
||||
case '=':
|
||||
v1 = interpret(what->arg2);
|
||||
sym = what->arg1;
|
||||
sym->aux = (int) what->arg2;
|
||||
break;
|
||||
case 'p':
|
||||
sym = what->arg1;
|
||||
switch(sym->class) {
|
||||
case SYM_VARIABLE_INT:
|
||||
printf( "Printing: %d\n", sym->aux );
|
||||
break;
|
||||
default:
|
||||
printf( "Unknown type passed to print\n" );
|
||||
switch (res.type = v1.type) {
|
||||
case T_VOID: runtime( "Can not assign void values" );
|
||||
case T_INT:
|
||||
if (sym->class != SYM_VARIABLE_INT)
|
||||
runtime( "Variable of bad type" );
|
||||
sym->aux = v1.val.i;
|
||||
break;
|
||||
}
|
||||
break;
|
||||
case 'c':
|
||||
res.type = T_INT;
|
||||
res.val.i = (int) what->arg1;
|
||||
break;
|
||||
case 'i':
|
||||
res.type = T_INT;
|
||||
res.val.i = * ((int *) what->arg1);
|
||||
break;
|
||||
case 'p':
|
||||
v1 = interpret(what->arg1);
|
||||
printf( "Printing: " );
|
||||
switch (v1.type) {
|
||||
case T_VOID: printf( "(void)" ); break;
|
||||
case T_INT: printf( "%d", v1.val.i ); break;
|
||||
default: runtime( "Print of variable of unknown type" );
|
||||
}
|
||||
printf( "\n" );
|
||||
break;
|
||||
case '?':
|
||||
v1 = interpret(what->arg1);
|
||||
if (v1.type != T_INT)
|
||||
runtime( "If requires integer expression" );
|
||||
if (v1.val.i)
|
||||
res = interpret(what->arg2);
|
||||
break;
|
||||
case 'D':
|
||||
printf( "DEBUGGING PRINT\n" );
|
||||
break;
|
||||
case '0':
|
||||
printf( "No operation\n" );
|
||||
break;
|
||||
case 'd':
|
||||
printf( "Puts: %s\n", what->arg1 );
|
||||
break;
|
||||
case '!':
|
||||
die( "Filter asked me to die" );
|
||||
default:
|
||||
die( "Unknown insruction %d(%c)", what->code, what->code & 0xff);
|
||||
}
|
||||
interpret(what->next);
|
||||
if (what->next)
|
||||
return interpret(what->next);
|
||||
return res;
|
||||
}
|
||||
|
||||
void
|
||||
@ -69,11 +118,11 @@ filters_postconfig(void)
|
||||
}
|
||||
}
|
||||
|
||||
struct f_instruction *
|
||||
struct f_inst *
|
||||
f_new_inst(void)
|
||||
{
|
||||
struct f_instruction * ret;
|
||||
ret = cfg_alloc(sizeof(struct f_instruction));
|
||||
struct f_inst * ret;
|
||||
ret = cfg_alloc(sizeof(struct f_inst));
|
||||
ret->code = 0;
|
||||
ret->arg1 = ret->arg2 = ret->next = NULL;
|
||||
return ret;
|
||||
@ -82,7 +131,7 @@ f_new_inst(void)
|
||||
int
|
||||
f_run(struct symbol *filter, struct rte *rtein, struct rte **rteout)
|
||||
{
|
||||
struct f_instruction *inst;
|
||||
struct f_inst *inst;
|
||||
debug( "Running filter `%s'...", filter->name );
|
||||
|
||||
inst = filter->def;
|
||||
|
||||
@ -11,19 +11,28 @@
|
||||
|
||||
#include "lib/resource.h"
|
||||
|
||||
/* Lexer */
|
||||
|
||||
struct f_instruction {
|
||||
struct f_instruction *next; /* Structure is 16 bytes, anyway */
|
||||
struct f_inst { /* Instruction */
|
||||
struct f_inst *next; /* Structure is 16 bytes, anyway */
|
||||
int code;
|
||||
void *arg1, *arg2;
|
||||
};
|
||||
|
||||
struct f_val {
|
||||
int type;
|
||||
union {
|
||||
int i;
|
||||
} val;
|
||||
};
|
||||
|
||||
void filters_postconfig(void);
|
||||
struct f_instruction *f_new_inst(void);
|
||||
struct f_inst *f_new_inst(void);
|
||||
|
||||
#define F_ACCEPT 1
|
||||
#define F_REJECT 2
|
||||
#define F_MODIFY 3
|
||||
|
||||
#define T_VOID 0
|
||||
#define T_INT 1
|
||||
#define T_PX 2
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user