Filter: Store variables and function arguments on stack
This commit is contained in:
Jan Maria Matejka
parent
20c6ea70cc
commit
96d757c13f
11 changed files with 125 additions and 195 deletions
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@ -116,7 +116,8 @@ struct symbol {
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const struct filter *filter; /* For SYM_FILTER */
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struct rtable_config *table; /* For SYM_TABLE */
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struct f_dynamic_attr *attribute; /* For SYM_ATTRIBUTE */
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struct f_val *val; /* For SYM_CONSTANT or SYM_VARIABLE */
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struct f_val *val; /* For SYM_CONSTANT */
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uint offset; /* For SYM_VARIABLE */
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};
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char name[0];
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@ -70,7 +70,7 @@ CF_DECLS
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struct f_dynamic_attr fda;
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struct f_static_attr fsa;
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struct f_lval flv;
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const struct f_line *fl;
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struct f_line *fl;
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const struct filter *f;
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struct f_tree *e;
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struct f_trie *trie;
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140
filter/config.Y
140
filter/config.Y
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@ -15,6 +15,8 @@ CF_HDR
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CF_DEFINES
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static uint decls_count;
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static inline u32 pair(u32 a, u32 b) { return (a << 16) | b; }
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static inline u32 pair_a(u32 p) { return p >> 16; }
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static inline u32 pair_b(u32 p) { return p & 0xFFFF; }
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@ -398,8 +400,8 @@ assert_assign(struct f_lval *lval, struct f_inst *expr, const char *start, const
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struct f_inst *setter, *getter, *checker;
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switch (lval->type) {
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case F_LVAL_VARIABLE:
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setter = f_new_inst(FI_SET, expr, lval->sym);
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getter = f_new_inst(FI_VARIABLE, lval->sym);
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setter = f_new_inst(FI_VAR_SET, expr, lval->sym);
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getter = f_new_inst(FI_VAR_GET, lval->sym);
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break;
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case F_LVAL_PREFERENCE:
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setter = f_new_inst(FI_PREF_SET, expr);
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@ -446,14 +448,14 @@ CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNSET, RETURN,
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%nonassoc THEN
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%nonassoc ELSE
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%type <xp> cmds_int function_body declsn function_params
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%type <x> term block cmd cmds constant constructor print_one print_list var_list var_listn function_call symbol_value bgp_path_expr bgp_path bgp_path_tail one_decl decls
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%type <xp> cmds_int
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%type <x> term block cmd cmds constant constructor print_one print_list var_list function_call symbol_value bgp_path_expr bgp_path bgp_path_tail
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%type <fda> dynamic_attr
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%type <fsa> static_attr
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%type <f> filter where_filter
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%type <fl> filter_body
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%type <fl> filter_body function_body
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%type <flv> lvalue
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%type <i> type
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%type <i> type function_params
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%type <ecs> ec_kind
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%type <fret> break_command
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%type <i32> cnum
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@ -553,43 +555,24 @@ type:
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}
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;
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one_decl:
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type CF_SYM_VOID {
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struct f_val * val = cfg_alloc(sizeof(struct f_val));
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val->type = T_VOID;
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$2 = cf_define_symbol($2, SYM_VARIABLE | $1, val, val);
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DBG( "New variable %s type %x\n", $2->name, $1 );
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$$ = f_new_inst(FI_SET, NULL, $2);
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}
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;
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/* Decls with ';' at the end. Beware; these are reversed. */
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decls: /* EMPTY */ { $$ = NULL; }
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| one_decl ';' decls {
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$$ = $1;
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$$->next = $3;
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}
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/* Declarations with ';' at the end */
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decls:
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/* EMPTY */
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| declsn ';'
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;
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/* Declarations that have no ';' at the end. */
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declsn: one_decl { $$[0] = $$[1] = $1; }
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| one_decl ';' declsn {
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$3[1]->next = $1;
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$$[1] = $3[1] = $1;
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$$[0] = $3[0];
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declsn:
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type CF_SYM_VOID {
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cf_define_symbol($2, SYM_VARIABLE | $1, offset, decls_count++);
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}
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| declsn ';' type CF_SYM_VOID {
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if (decls_count >= 0xff) cf_error("Too many declarations, at most 255 allowed");
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cf_define_symbol($4, SYM_VARIABLE | $3, offset, decls_count++);
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}
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;
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filter_body:
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function_body {
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if ($1[0]) {
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const struct f_inst *inst[2] = { $1[0], $1[1] };
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$$ = f_postfixify_concat(inst, 2);
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}
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else
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$$ = f_postfixify($1[1]);
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}
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;
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filter_body: { decls_count = 0; } function_body { $$ = $2; } ;
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filter:
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CF_SYM_KNOWN {
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@ -611,14 +594,14 @@ where_filter:
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;
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function_params:
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'(' declsn ')' { $$[0] = $2[0]; $$[1] = $2[1]; }
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| '(' ')' { $$[0] = $$[1] = NULL; }
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'(' declsn ')' { $$ = decls_count; }
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| '(' ')' { $$ = 0; }
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;
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function_body:
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decls '{' cmds '}' {
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$$[0] = $1 ? f_clear_local_vars($1) : NULL;
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$$[1] = $3;
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$$ = f_postfixify($3);
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$$->vars = decls_count;
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}
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;
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@ -627,33 +610,11 @@ function_def:
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FUNCTION CF_SYM_VOID { DBG( "Beginning of function %s\n", $2->name );
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$2 = cf_define_symbol($2, SYM_FUNCTION, function, NULL);
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cf_push_scope($2);
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decls_count = 0;
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} function_params function_body {
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const struct f_inst *catlist[4];
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uint count = 0;
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/* Argument setters */
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if ($4[0])
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catlist[count++] = $4[0];
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/* Local var clearers */
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if ($5[0])
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catlist[count++] = $5[0];
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/* Return void if no return is needed */
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catlist[count++] = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_VOID });
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/* Function body itself */
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if ($5[1])
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catlist[count++] = $5[1];
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struct f_line *fl = f_postfixify_concat(catlist, count);
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fl->args = 0;
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for (const struct f_inst *arg = $4[0]; arg; arg = arg->next)
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fl->args++;
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$2->function = fl;
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$5->vars -= $4;
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$5->args = $4;
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$2->function = $5;
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cf_pop_scope();
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}
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;
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@ -862,9 +823,33 @@ constructor:
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;
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/* This generates the function_call variable list backwards. */
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var_list: /* EMPTY */ { $$ = NULL; }
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| term { $$ = $1; }
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| var_list ',' term { $$ = $3; $$->next = $1; }
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function_call:
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CF_SYM_KNOWN '(' var_list ')' {
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$$ = f_new_inst(FI_CALL, $1, $3);
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if ($1->class != SYM_FUNCTION)
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cf_error("You can't call something which is not a function. Really.");
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struct f_inst *fc = f_new_inst(FI_CALL, $1);
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uint args = 0;
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while ($3) {
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args++;
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struct f_inst *tmp = $3->next;
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$3->next = fc;
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fc = $3;
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$3 = tmp;
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}
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if (args != $1->function->args)
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cf_error("Function call '%s' got %u arguments, need %u arguments.",
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$1->name, args, $1->function->args);
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$$ = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_VOID });
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$$->next = fc;
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}
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;
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@ -872,8 +857,10 @@ symbol_value: CF_SYM_KNOWN
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{
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switch ($1->class) {
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case SYM_CONSTANT_RANGE:
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$$ = f_new_inst(FI_CONSTANT_DEFINED, $1);
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break;
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case SYM_VARIABLE_RANGE:
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$$ = f_new_inst(FI_VARIABLE, $1);
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$$ = f_new_inst(FI_VAR_GET, $1);
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break;
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case SYM_ATTRIBUTE:
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$$ = f_new_inst(FI_EA_GET, *$1->attribute);
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@ -988,19 +975,6 @@ print_list: /* EMPTY */ { $$ = NULL; }
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}
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;
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var_listn: term {
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$$ = $1;
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}
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| term ',' var_listn {
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$$ = $1;
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$$->next = $3;
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}
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;
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var_list: /* EMPTY */ { $$ = NULL; }
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| var_listn { $$ = $1; }
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;
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cmd:
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IF term THEN block {
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$$ = f_new_inst(FI_CONDITION, $2, $4, NULL);
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@ -1011,7 +985,7 @@ cmd:
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| CF_SYM_KNOWN '=' term ';' {
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switch ($1->class) {
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case SYM_VARIABLE_RANGE:
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$$ = f_new_inst(FI_SET, $3, $1);
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$$ = f_new_inst(FI_VAR_SET, $3, $1);
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break;
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case SYM_ATTRIBUTE:
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$$ = f_new_inst(FI_EA_SET, $3, *$1->attribute);
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@ -17,8 +17,8 @@
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/* Internal types */
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enum f_type {
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/* Do not use type of zero, that way we'll see errors easier. */
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T_VOID = 1,
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/* Nothing. Simply nothing. */
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T_VOID = 0,
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/* User visible types, which fit in int */
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T_INT = 0x10,
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@ -209,6 +209,7 @@ do {
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estk.item[estk.cnt].pos = 0;
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estk.item[estk.cnt].line = $1;
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estk.item[estk.cnt].ventry = vstk.cnt;
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estk.item[estk.cnt].vbase = estk.item[estk.cnt-1].vbase;
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estk.item[estk.cnt].emask = 0;
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estk.cnt++;
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} while (0)m4_dnl
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@ -377,7 +378,7 @@ FID_WR_PUT(4)
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/* Filter instruction structure for config */
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struct f_inst {
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const struct f_inst *next; /* Next instruction */
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struct f_inst *next; /* Next instruction */
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enum f_instruction_code fi_code; /* Instruction code */
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int size; /* How many instructions are underneath */
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int lineno; /* Line number */
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@ -261,23 +261,28 @@
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}
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/* Set to indirect value prepared in v1 */
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INST(FI_SET, 1, 0) {
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INST(FI_VAR_SET, 1, 0) {
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ARG_ANY(2);
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SYMBOL(1);
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if ((sym->class != (SYM_VARIABLE | v1.type)) && (v1.type != T_VOID))
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{
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/* IP->Quad implicit conversion */
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if ((sym->class == (SYM_VARIABLE | T_QUAD)) && val_is_ip4(&v1))
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{
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*(sym->val) = (struct f_val) {
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v1 = (struct f_val) {
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.type = T_QUAD,
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.val.i = ipa_to_u32(v1.val.ip),
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};
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break;
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}
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runtime( "Assigning to variable of incompatible type" );
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else
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runtime( "Assigning to variable of incompatible type" );
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}
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*(sym->val) = v1;
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vstk.val[curline.vbase + sym->offset] = v1;
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}
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INST(FI_VAR_GET, 0, 1) {
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SYMBOL(1);
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res = vstk.val[curline.vbase + sym->offset];
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RESULT_OK;
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}
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/* some constants have value in a[1], some in *a[0].p, strange. */
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@ -301,7 +306,7 @@
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res = whati->val;
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RESULT_OK;
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}
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INST(FI_VARIABLE, 0, 1) {
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INST(FI_CONSTANT_DEFINED, 0, 1) {
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FID_STRUCT_IN
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const struct symbol *sym;
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FID_LINE_IN
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@ -314,18 +319,9 @@
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FID_POSTFIXIFY_BODY
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item->valp = (item->sym = what->sym)->val;
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FID_SAME_BODY
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if (strcmp(f1->sym->name, f2->sym->name) || (f1->sym->class != f2->sym->class)) return 0;
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if (strcmp(f1->sym->name, f2->sym->name) || !val_same(f1->sym->val, f2->sym->val)) return 0;
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FID_DUMP_BODY
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switch (item->sym->class) {
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case SYM_CONSTANT_RANGE:
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debug("%sconstant %s with value %s\n", INDENT, item->sym->name, val_dump(item->valp));
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break;
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case SYM_VARIABLE_RANGE:
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debug("%svariable %s with current value %s\n", INDENT, item->sym->name, val_dump(item->valp));
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break;
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default:
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bug("Symbol %s of type %d doesn't reference a value", item->sym->name, item->sym->class);
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}
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debug("%sconstant %s with value %s\n", INDENT, item->sym->name, val_dump(item->valp));
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FID_ALL
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res = *whati->valp;
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@ -768,56 +764,31 @@
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else
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runtime("Can't return non-bool from non-function");
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/* Set the value stack position */
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vstk.cnt = estk.item[estk.cnt].ventry;
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/* Set the value stack position, overwriting the former implicit void */
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vstk.cnt = estk.item[estk.cnt].ventry - 1;
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/* Copy the return value */
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RESULT_VAL(vstk.val[retpos]);
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}
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INST(FI_CALL, 0, 1) {
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FID_LINE_IN
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const struct f_line *args;
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const struct f_line *body;
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struct symbol *sym;
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FID_STRUCT_IN
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struct symbol *sym;
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const struct f_inst *args;
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FID_NEW_ARGS
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, struct symbol * sym
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, const struct f_inst *args
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FID_NEW_BODY
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if (sym->class != SYM_FUNCTION)
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cf_error("You can't call something which is not a function. Really.");
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SYMBOL;
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uint count = 0;
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for (const struct f_inst *inst = args; inst; inst = inst->next)
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count++;
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if (count != sym->function->args)
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cf_error("Function %s takes %u arguments, got %u.", sym->name, sym->function->args, count);
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what->sym = sym;
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what->args = args;
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FID_DUMP_BODY
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debug("%scalling %s with following args\n", INDENT, item->sym->name);
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f_dump_line(item->args, indent + 1);
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FID_POSTFIXIFY_BODY
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item->args = f_postfixify(what->args);
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item->body = (item->sym = what->sym)->function;
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FID_SAME_BODY
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/* To be done better */
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if (strcmp(f1->sym->name, f2->sym->name)) return 0;
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if (!f_same(f1->args, f2->args)) return 0;
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if (!f_same(f1->body, f2->body)) return 0;
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FID_ALL
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/* First push the body on stack */
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LINEX(whati->body);
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/* Push the body on stack */
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LINEX(sym->function);
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curline.emask |= FE_RETURN;
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/* Then push the arguments */
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LINEX(whati->args);
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/* Before this instruction was called, there was the T_VOID
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* automatic return value pushed on value stack and also
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* sym->function->args function arguments. Setting the
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* vbase to point to first argument. */
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ASSERT(curline.ventry >= sym->function->args);
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curline.ventry -= sym->function->args;
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curline.vbase = curline.ventry;
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/* Storage for local variables */
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memset(&(vstk.val[vstk.cnt]), 0, sizeof(struct f_val) * sym->function->vars);
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vstk.cnt += sym->function->vars;
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}
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INST(FI_DROP_RESULT, 1, 0) {
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@ -63,13 +63,12 @@ enum f_instruction_flags {
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/* Convert the instruction back to the enum name */
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const char *f_instruction_name(enum f_instruction_code fi);
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struct f_inst *f_clear_local_vars(struct f_inst *decls);
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/* Filter structures for execution */
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/* Line of instructions to be unconditionally executed one after another */
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struct f_line {
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uint len; /* Line length */
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u8 args; /* Function: Args required */
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u8 vars;
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struct f_line_item items[0]; /* The items themselves */
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};
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@ -30,11 +30,6 @@ filter_name(const struct filter *filter)
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return filter->sym->name;
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}
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||||
void f_inst_next(struct f_inst *first, const struct f_inst *append)
|
||||
{
|
||||
first->next = append;
|
||||
}
|
||||
|
||||
struct filter *f_new_where(const struct f_inst *where)
|
||||
{
|
||||
struct f_inst acc = {
|
||||
|
|
@ -67,23 +62,6 @@ struct filter *f_new_where(const struct f_inst *where)
|
|||
return f;
|
||||
}
|
||||
|
||||
struct f_inst *f_clear_local_vars(struct f_inst *decls)
|
||||
{
|
||||
/* Prepend instructions to clear local variables */
|
||||
struct f_inst *head = NULL;
|
||||
|
||||
for (const struct f_inst *si = decls; si; si = si->next) {
|
||||
struct f_inst *cur = f_new_inst(FI_CONSTANT, (struct f_val) { .type = T_VOID });
|
||||
if (head)
|
||||
f_inst_next(cur, head);
|
||||
else
|
||||
f_inst_next(cur, si);
|
||||
head = cur; /* The first FI_CONSTANT put there */
|
||||
}
|
||||
|
||||
return head;
|
||||
}
|
||||
|
||||
#define CA_KEY(n) n->name, n->fda.type
|
||||
#define CA_NEXT(n) n->next
|
||||
#define CA_EQ(na,ta,nb,tb) (!strcmp(na,nb) && (ta == tb))
|
||||
|
|
|
|||
|
|
@ -135,6 +135,8 @@ static struct tbf rl_runtime_err = TBF_DEFAULT_LOG_LIMITS;
|
|||
static enum filter_return
|
||||
interpret(struct filter_state *fs, const struct f_line *line, struct f_val *val)
|
||||
{
|
||||
/* No arguments allowed */
|
||||
ASSERT(line->args == 0);
|
||||
|
||||
#define F_VAL_STACK_MAX 4096
|
||||
/* Value stack for execution */
|
||||
|
|
@ -145,8 +147,12 @@ interpret(struct filter_state *fs, const struct f_line *line, struct f_val *val)
|
|||
|
||||
/* The stack itself is intentionally kept as-is for performance reasons.
|
||||
* Do NOT rewrite this to initialization by struct literal. It's slow.
|
||||
*/
|
||||
vstk.cnt = 0;
|
||||
*
|
||||
* Reserving space for local variables. */
|
||||
|
||||
vstk.cnt = line->vars;
|
||||
memset(vstk.val, 0, sizeof(struct f_val) * line->vars);
|
||||
|
||||
#define F_EXEC_STACK_MAX 4096
|
||||
|
||||
/* Exception bits */
|
||||
|
|
@ -160,6 +166,7 @@ interpret(struct filter_state *fs, const struct f_line *line, struct f_val *val)
|
|||
const struct f_line *line; /* The line that is being executed */
|
||||
uint pos; /* Instruction index in the line */
|
||||
uint ventry; /* Value stack depth on entry */
|
||||
uint vbase; /* Where to index variable positions from */
|
||||
enum f_exception emask; /* Exception mask */
|
||||
} item[F_EXEC_STACK_MAX];
|
||||
uint cnt; /* Current stack size; 0 for empty */
|
||||
|
|
@ -181,7 +188,6 @@ interpret(struct filter_state *fs, const struct f_line *line, struct f_val *val)
|
|||
while (curline.pos < curline.line->len) {
|
||||
const struct f_line_item *what = &(curline.line->items[curline.pos++]);
|
||||
|
||||
|
||||
switch (what->fi_code) {
|
||||
#define res vstk.val[vstk.cnt]
|
||||
#define v1 vstk.val[vstk.cnt]
|
||||
|
|
@ -207,26 +213,28 @@ interpret(struct filter_state *fs, const struct f_line *line, struct f_val *val)
|
|||
#undef ACCESS_EATTRS
|
||||
}
|
||||
}
|
||||
|
||||
/* End of current line. Drop local variables before exiting. */
|
||||
vstk.cnt -= curline.line->vars;
|
||||
vstk.cnt -= curline.line->args;
|
||||
estk.cnt--;
|
||||
}
|
||||
|
||||
switch (vstk.cnt) {
|
||||
case 0:
|
||||
if (val) {
|
||||
log_rl(&rl_runtime_err, L_ERR "filters: No value left on stack");
|
||||
return F_ERROR;
|
||||
}
|
||||
return F_NOP;
|
||||
case 1:
|
||||
if (val) {
|
||||
*val = vstk.val[0];
|
||||
return F_NOP;
|
||||
}
|
||||
/* fallthrough */
|
||||
default:
|
||||
log_rl(&rl_runtime_err, L_ERR "Too many items left on stack: %u", vstk.cnt);
|
||||
if (vstk.cnt == 0) {
|
||||
if (val) {
|
||||
log_rl(&rl_runtime_err, L_ERR "filters: No value left on stack");
|
||||
return F_ERROR;
|
||||
}
|
||||
return F_NOP;
|
||||
}
|
||||
|
||||
if (val && (vstk.cnt == 1)) {
|
||||
*val = vstk.val[0];
|
||||
return F_NOP;
|
||||
}
|
||||
|
||||
log_rl(&rl_runtime_err, L_ERR "Too many items left on stack: %u", vstk.cnt);
|
||||
return F_ERROR;
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -56,8 +56,7 @@ run_function(const void *arg)
|
|||
}
|
||||
|
||||
linpool *tmp = lp_new_default(&root_pool);
|
||||
struct f_val res;
|
||||
enum filter_return fret = f_eval(t->fn, tmp, &res);
|
||||
enum filter_return fret = f_eval(t->fn, tmp, NULL);
|
||||
rfree(tmp);
|
||||
|
||||
return (fret < F_REJECT);
|
||||
|
|
|
|||
|
|
@ -7,8 +7,7 @@
|
|||
router id 62.168.0.1;
|
||||
|
||||
/* We have to setup any protocol */
|
||||
protocol static { ipv4; }
|
||||
|
||||
protocol device { }
|
||||
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue