mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-11-09 20:58:44 +00:00
a2527ee53d
When f_line is done, we have to pop the stack frame. The old code just removed nominal number of args/vars. Change it to use stored ventry value modified by number of returned values. This allows to allocate variables on a stack frame during execution of f_lines instead of just at start. But we need to know the number of returned values for a f_line. It is 1 for term, 0 for cmd. Store that to f_line during linearization.
120 lines
4.3 KiB
C
120 lines
4.3 KiB
C
/*
|
|
* BIRD Internet Routing Daemon -- Filter instructions
|
|
*
|
|
* (c) 1999 Pavel Machek <pavel@ucw.cz>
|
|
* (c) 2018--2019 Maria Matejka <mq@jmq.cz>
|
|
*
|
|
* Can be freely distributed and used under the terms of the GNU GPL.
|
|
*
|
|
* Filter interpreter data structures and internal API.
|
|
* See filter/f-inst.c for documentation.
|
|
*/
|
|
|
|
#ifndef _BIRD_F_INST_H_
|
|
#define _BIRD_F_INST_H_
|
|
|
|
#include "nest/bird.h"
|
|
#include "conf/conf.h"
|
|
#include "filter/filter.h"
|
|
#include "filter/data.h"
|
|
#include "lib/buffer.h"
|
|
#include "lib/flowspec.h"
|
|
|
|
/* Flags for instructions */
|
|
enum f_instruction_flags {
|
|
FIF_RECURSIVE = 1, /* FI_CALL: function is directly recursive */
|
|
} PACKED;
|
|
|
|
/* Include generated filter instruction declarations */
|
|
#include "filter/inst-gen.h"
|
|
|
|
#define f_new_inst(...) MACRO_CONCAT_AFTER(f_new_inst_, MACRO_FIRST(__VA_ARGS__))(__VA_ARGS__)
|
|
|
|
/* Convert the instruction back to the enum name */
|
|
const char *f_instruction_name_(enum f_instruction_code fi);
|
|
static inline const char *f_instruction_name(enum f_instruction_code fi)
|
|
{ return f_instruction_name_(fi) + 3; }
|
|
|
|
struct f_arg {
|
|
struct symbol *arg;
|
|
struct f_arg *next;
|
|
};
|
|
|
|
/* Filter structures for execution */
|
|
/* Line of instructions to be unconditionally executed one after another */
|
|
struct f_line {
|
|
uint len; /* Line length */
|
|
u8 args; /* Function: Args required */
|
|
u8 vars;
|
|
u8 results; /* Results left on stack: cmd -> 0, term -> 1 */
|
|
struct f_arg *arg_list;
|
|
struct f_line_item items[0]; /* The items themselves */
|
|
};
|
|
|
|
/* Convert the f_inst infix tree to the f_line structures */
|
|
struct f_line *f_linearize_concat(const struct f_inst * const inst[], uint count, uint results);
|
|
static inline struct f_line *f_linearize(const struct f_inst *root, uint results)
|
|
{ return f_linearize_concat(&root, 1, results); }
|
|
|
|
void f_dump_line(const struct f_line *, uint indent);
|
|
|
|
|
|
/* Recursive iteration over filter instructions */
|
|
|
|
struct filter_iterator {
|
|
BUFFER_(const struct f_line *) lines;
|
|
};
|
|
|
|
void f_add_lines(const struct f_line_item *what, struct filter_iterator *fit);
|
|
|
|
#define FILTER_ITERATE_INIT(fit, filter, pool) \
|
|
({ \
|
|
BUFFER_INIT((fit)->lines, (pool), 32); \
|
|
BUFFER_PUSH((fit)->lines) = (filter)->root; \
|
|
})
|
|
|
|
#define FILTER_ITERATE(fit, fi) ({ \
|
|
const struct f_line *fl_; \
|
|
while (!BUFFER_EMPTY((fit)->lines)) \
|
|
{ \
|
|
BUFFER_POP((fit)->lines); \
|
|
fl_ = (fit)->lines.data[(fit)->lines.used]; \
|
|
for (uint i_ = 0; i_ < fl_->len; i_++) \
|
|
{ \
|
|
const struct f_line_item *fi = &fl_->items[i_]; \
|
|
f_add_lines(fi, (fit));
|
|
|
|
#define FILTER_ITERATE_END } } })
|
|
|
|
#define FILTER_ITERATE_CLEANUP(fit) \
|
|
({ \
|
|
mb_free((fit)->lines.data); \
|
|
memset((fit), 0, sizeof(struct filter_iterator)); \
|
|
})
|
|
|
|
|
|
struct filter *f_new_where(struct f_inst *);
|
|
static inline struct f_dynamic_attr f_new_dynamic_attr(u8 type, enum f_type f_type, uint code) /* Type as core knows it, type as filters know it, and code of dynamic attribute */
|
|
{ return (struct f_dynamic_attr) { .type = type, .f_type = f_type, .ea_code = code }; } /* f_type currently unused; will be handy for static type checking */
|
|
static inline struct f_dynamic_attr f_new_dynamic_attr_bit(u8 bit, enum f_type f_type, uint code) /* Type as core knows it, type as filters know it, and code of dynamic attribute */
|
|
{ return (struct f_dynamic_attr) { .type = EAF_TYPE_BITFIELD, .bit = bit, .f_type = f_type, .ea_code = code }; } /* f_type currently unused; will be handy for static type checking */
|
|
static inline struct f_static_attr f_new_static_attr(int f_type, int code, int readonly)
|
|
{ return (struct f_static_attr) { .f_type = f_type, .sa_code = code, .readonly = readonly }; }
|
|
struct f_inst *f_generate_complex(enum f_instruction_code fi_code, struct f_dynamic_attr da, struct f_inst *argument);
|
|
struct f_inst *f_generate_roa_check(struct rtable_config *table, struct f_inst *prefix, struct f_inst *asn);
|
|
|
|
/* Hook for call bt_assert() function in configuration */
|
|
extern void (*bt_assert_hook)(int result, const struct f_line_item *assert);
|
|
|
|
/* Bird Tests */
|
|
struct f_bt_test_suite {
|
|
node n; /* Node in config->tests */
|
|
const struct f_line *fn; /* Root of function */
|
|
const struct f_line *cmp; /* Compare to this function */
|
|
const char *fn_name; /* Name of test */
|
|
const char *dsc; /* Description */
|
|
int result; /* Desired result */
|
|
};
|
|
|
|
#endif
|