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https://gitlab.nic.cz/labs/bird.git
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Update of filters towards new interface.
This commit is contained in:
Pavel Machek
parent
5bc512aa3a
commit
ba92164871
15
bird.conf
15
bird.conf
@ -8,19 +8,11 @@ router id 62.168.0.1
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define xyzzy = 120+10
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function test() {
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int i;
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function startup () int i; { printdebug; printdebug; i = 5; print( i ); i = 1234 + i; print( i ); if 0 then { puts( "You must not ever see this" ); quitbird; } print( 2 ); if 1 then puts( "jedna dve honza jde" ); quitbird; }
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filter testf int j; { j = const(4321); print( j ); }
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printdebug;
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i = 5;
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print( i );
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printdebug;
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i = 1234;
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print( i );
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printdebug;
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}
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/*
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protocol rip MyRIP_test {
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preference xyzzy
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debug all
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@ -29,7 +21,6 @@ protocol rip MyRIP_test {
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garbagetime 30
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interface "*"
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}
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*/
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protocol device {
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disabled
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@ -58,10 +58,11 @@ struct symbol {
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#define SYM_PROTO 1
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#define SYM_NUMBER 2
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#define SYM_STAT 3 /* statement */
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#define SYM_VARIABLE_INT 4
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#define SYM_FUNCTION 5
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#define SYM_FILTER 6
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#define SYM_VARIABLE 0x100 /* Reserved 0x100..0x1ff */
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extern int conf_lino;
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void cf_lex_init_tables(void);
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181
filter/config.Y
181
filter/config.Y
@ -18,29 +18,19 @@ CF_HDR
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CF_DECLS
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CF_KEYWORDS(FUNCTION, FILTER, PRINTDEBUG, INT, PRINT, CONST, VAR, PUTS, IF,
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ACCEPT, REJECT, ERROR, QUITBIRD)
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CF_KEYWORDS(FUNCTION, PRINTDEBUG, PRINT, CONST, PUTS,
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ACCEPT, REJECT, ERROR, QUITBIRD,
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INT, BOOL, IP, PREFIX, PAIR, SET, STRING,
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IF, THEN,
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FILTER
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)
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%type <x> term
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%type <x> block
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%type <x> cmds
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%type <x> term block cmds cmd function_body
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%type <f> filter filter_body
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%type <i> type break_command
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CF_GRAMMAR
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CF_ADDTO(conf, function)
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function:
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FUNCTION SYM '(' ')' '{' cmds '}' {
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extern struct f_inst *autoexec_func;
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if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
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$2->class = SYM_FUNCTION;
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$2->def = $6;
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if (!strcasecmp($2->name, "autoexec"))
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autoexec_func = $6;
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printf("Hmm, we've got one function here\n");
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}
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;
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CF_ADDTO(conf, filter_def)
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filter_def:
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FILTER SYM filter_body {
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@ -52,11 +42,36 @@ filter_def:
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}
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;
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type:
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INT { $$ = T_INT; }
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| BOOL { $$ = T_BOOL; }
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| IP { $$ = T_IP; }
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| PREFIX { $$ = T_PREFIX; }
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| PAIR { $$ = T_PAIR; }
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| STRING { $$ = T_STRING; }
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| type SET {
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switch ($1) {
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default:
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cf_error( "You can not create sets of this type\n" );
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case T_INT: case T_IP: case T_PREFIX: case T_PAIR:
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}
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$$ = $1 | T_SET;
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}
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;
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decls: /* EMPTY */
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| type SYM ';' decls {
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if ($2->class != SYM_VOID) cf_error("Symbol already defined, can not use as variable\n" );
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$2->class = SYM_VARIABLE | $1;
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printf( "New variable %s type %x\n", $2->name, $1 );
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}
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;
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filter_body:
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'{' cmds '}' {
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function_body {
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struct filter *f = cfg_alloc(sizeof(struct filter));
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f->name = NULL;
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f->root = $2;
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f->root = $1;
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$$ = f;
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}
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;
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@ -69,25 +84,42 @@ filter:
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| filter_body
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;
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function_params:
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'(' decls ')' { printf( "Have function parameters\n" ); }
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;
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function_body:
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decls '{' cmds '}' {
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$$ = $3;
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}
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;
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CF_ADDTO(conf, function_def)
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function_def:
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FUNCTION SYM function_params function_body {
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extern struct f_inst *startup_func;
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if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
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$2->class = SYM_FUNCTION;
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$2->def = $4;
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if (!strcasecmp($2->name, "startup"))
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startup_func = $4;
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printf("Hmm, we've got one function here - %s\n", $2->name);
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}
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;
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/* Programs */
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cmds:
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term {
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cmds: /* EMPTY */ { $$ = NULL; }
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| cmd cmds {
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if ($1) {
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$1->next = NULL;
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$1->next = $2;
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$$ = $1;
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} else $$ = NULL;
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}
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| term ';' cmds {
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if ($1) {
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$1->next = $3;
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$$ = $1;
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} else $$ = $3;
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} else $$ = $2;
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}
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;
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block:
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term ';' {
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cmd {
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$$=$1;
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}
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| '{' cmds '}' {
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@ -96,31 +128,16 @@ block:
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;
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term:
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/* EMPTY */ {
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$$ = NULL;
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}
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| term '+' term {
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term '+' term {
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$$ = f_new_inst();
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$$->code = '+';
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$$->arg1 = $1;
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$$->arg2 = $3;
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}
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| IF '(' term ')' block {
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$$ = f_new_inst();
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$$->code = '?';
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$$->arg1 = $3;
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$$->arg2 = $5;
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}
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| INT SYM {
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if ($2->class != SYM_VOID) cf_error("Symbol already defined, can not use as variable\n" );
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$2->class = SYM_VARIABLE_INT;
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printf( "New variable\n" );
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$$ = NULL;
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}
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| SYM {
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$$ = f_new_inst();
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switch ($1->class) {
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case SYM_VARIABLE_INT:
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case SYM_VARIABLE | T_INT:
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$$->code = 'i';
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$$->arg1 = &($1->aux);
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break;
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@ -128,73 +145,63 @@ term:
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cf_error("Can not use this class of symbol as variable" );
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}
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}
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| VAR '(' SYM ')' {
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| CONST '(' expr ')' {
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$$ = f_new_inst();
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switch ($3->class) {
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case SYM_VARIABLE_INT:
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$$->code = 'i';
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$$->arg1 = &($3->aux);
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break;
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default:
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cf_error("Can not use this class of symbol as variable" );
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}
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$$->code = 'c';
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$$->arg1 = $3;
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}
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| NUM {
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$$ = f_new_inst();
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$$->code = 'c';
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$$->arg1 = $1
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}
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| CONST '(' expr ')' {
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;
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break_command:
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QUITBIRD { $$ = F_QUITBIRD }
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| ACCEPT { $$ = F_ACCEPT }
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| REJECT { $$ = F_REJECT }
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| ERROR { $$ = F_ERROR }
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;
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cmd:
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IF term THEN block {
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$$ = f_new_inst();
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$$->code = 'c';
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$$->arg1 = $3;
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$$->code = '?';
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$$->arg1 = $2;
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$$->arg2 = $4;
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}
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| SYM '=' term {
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| SYM '=' term ';' {
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$$ = f_new_inst();
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printf( "Ook, we'll set value\n" );
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if ($1->class != SYM_VARIABLE_INT)
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cf_error( "You may only set variables\n" );
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if (($1->class & ~T_MASK) != SYM_VARIABLE)
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cf_error( "You may only set variables, and this is %x.\n", $1->class );
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$$->code = '=';
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$$->arg1 = $1;
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$$->arg2 = $3;
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}
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| PRINT '(' term ')' {
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| PRINT '(' term ')' ';' {
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$$ = f_new_inst();
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printf( "Ook, we'll print something\n" );
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$$->code = 'p';
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$$->arg1 = $3;
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$$->arg2 = NULL;
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}
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| PUTS '(' TEXT ')' {
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| PUTS '(' TEXT ')' ';' {
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$$ = f_new_inst();
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$$->code = 'd';
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$$->arg1 = $3;
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}
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| QUITBIRD {
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$$ = f_new_inst();
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$$->code = '!';
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(int) $$->arg1 = F_QUITBIRD;
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}
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| ACCEPT {
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$$ = f_new_inst();
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$$->code = '!';
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(int) $$->arg1 = F_ACCEPT;
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}
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| REJECT {
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$$ = f_new_inst();
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$$->code = '!';
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(int) $$->arg1 = F_REJECT;
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}
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| ERROR {
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$$ = f_new_inst();
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$$->code = '!';
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(int) $$->arg1 = F_ERROR;
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}
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| PRINTDEBUG {
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| PRINTDEBUG ';' {
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$$ = f_new_inst();
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$$->code = 'D';
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$$->arg1 = $$->arg2 = NULL;
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}
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}
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| break_command ';' {
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$$ = f_new_inst();
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$$->code = '!';
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(int) $$->arg1 = $1;
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}
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;
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CF_END
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@ -22,7 +22,7 @@
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#include "conf/conf.h"
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#include "filter/filter.h"
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struct f_inst *autoexec_func = NULL;
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struct f_inst *startup_func = NULL;
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#define runtime(x) do { \
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log( L_ERR, x ); \
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@ -71,7 +71,7 @@ interpret(struct f_inst *what)
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switch (res.type = v2.type) {
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case T_VOID: runtime( "Can not assign void values" );
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case T_INT:
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if (sym->class != SYM_VARIABLE_INT)
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if (sym->class != (SYM_VARIABLE | T_INT))
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runtime( "Variable of bad type" );
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sym->aux = v2.val.i;
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break;
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@ -163,6 +163,9 @@ f_run(struct filter *filter, struct rte *rtein, struct rte **rteout)
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void
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filters_postconfig(void)
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{
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if (autoexec_func)
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interpret(autoexec_func);
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printf( "Launching startup function..." );
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if (startup_func)
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interpret(startup_func);
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printf( "done\n" );
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exit(0);
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}
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@ -40,10 +40,24 @@ int f_run(struct filter *filter, struct rte *rtein, struct rte **rteout);
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#define F_ERROR 4
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#define F_QUITBIRD 5
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/* Type numbers must be in 0..0xff range */
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#define T_MASK 0xff
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/* Internal types */
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#define T_VOID 0
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#define T_RETURN 1
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#define T_INT 10
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#define T_PX 11 /* prefix */
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#define T_INTLIST 12
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/* User visible types, which fit in int */
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#define T_INT 0x10
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#define T_BOOL 0x11
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#define T_PAIR 0x12
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#define T_ENUM 0x13
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/* Bigger ones */
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#define T_IP 0x20
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#define T_PREFIX 0x21
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#define T_STRING 0x22
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#define T_SET 0x80
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#endif
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