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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
/*
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* BIRD Internet Routing Daemon -- Filter instructions
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*
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* (c) 1999 Pavel Machek <pavel@ucw.cz>
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* (c) 2018--2019 Maria Matejka <mq@jmq.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*
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* Filter interpreter data structures and internal API.
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* See filter/f-inst.c for documentation.
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*/
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#ifndef _BIRD_F_INST_H_
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#define _BIRD_F_INST_H_
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#include "nest/bird.h"
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#include "conf/conf.h"
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#include "filter/filter.h"
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#include "filter/data.h"
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#include "lib/buffer.h"
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#include "lib/flowspec.h"
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/* Flags for instructions */
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enum f_instruction_flags {
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FIF_RECURSIVE = 1, /* FI_CALL: function is directly recursive */
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} PACKED;
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/* Include generated filter instruction declarations */
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#include "filter/inst-gen.h"
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#define f_new_inst(...) MACRO_CONCAT_AFTER(f_new_inst_, MACRO_FIRST(__VA_ARGS__))(__VA_ARGS__)
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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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static inline const char *f_instruction_name(enum f_instruction_code fi)
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{ return f_instruction_name_(fi) + 3; }
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struct f_arg {
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struct symbol *arg;
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struct f_arg *next;
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};
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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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u8 results; /* Results left on stack: cmd -> 0, term -> 1 */
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struct f_arg *arg_list;
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struct f_line_item items[0]; /* The items themselves */
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};
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/* Convert the f_inst infix tree to the f_line structures */
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struct f_line *f_linearize_concat(const struct f_inst * const inst[], uint count, uint results);
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static inline struct f_line *f_linearize(const struct f_inst *root, uint results)
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{ return f_linearize_concat(&root, 1, results); }
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void f_dump_line(const struct f_line *, uint indent);
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/* Recursive iteration over filter instructions */
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struct filter_iterator {
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BUFFER_(const struct f_line *) lines;
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};
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void f_add_lines(const struct f_line_item *what, struct filter_iterator *fit);
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#define FILTER_ITERATE_INIT(fit, filter, pool) \
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({ \
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BUFFER_INIT((fit)->lines, (pool), 32); \
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BUFFER_PUSH((fit)->lines) = (filter)->root; \
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})
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#define FILTER_ITERATE(fit, fi) ({ \
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const struct f_line *fl_; \
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while (!BUFFER_EMPTY((fit)->lines)) \
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{ \
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BUFFER_POP((fit)->lines); \
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fl_ = (fit)->lines.data[(fit)->lines.used]; \
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for (uint i_ = 0; i_ < fl_->len; i_++) \
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{ \
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const struct f_line_item *fi = &fl_->items[i_]; \
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f_add_lines(fi, (fit));
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#define FILTER_ITERATE_END } } })
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#define FILTER_ITERATE_CLEANUP(fit) \
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({ \
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mb_free((fit)->lines.data); \
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memset((fit), 0, sizeof(struct filter_iterator)); \
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})
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struct filter *f_new_where(struct f_inst *);
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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 */
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{ 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 */
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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 */
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{ 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 */
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static inline struct f_static_attr f_new_static_attr(int f_type, int code, int readonly)
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{ return (struct f_static_attr) { .f_type = f_type, .sa_code = code, .readonly = readonly }; }
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struct f_inst *f_generate_complex(enum f_instruction_code fi_code, struct f_dynamic_attr da, struct f_inst *argument);
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struct f_inst *f_generate_roa_check(struct rtable_config *table, struct f_inst *prefix, struct f_inst *asn);
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/* Hook for call bt_assert() function in configuration */
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extern void (*bt_assert_hook)(int result, const struct f_line_item *assert);
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/* Bird Tests */
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struct f_bt_test_suite {
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node n; /* Node in config->tests */
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const struct f_line *fn; /* Root of function */
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const struct f_line *cmp; /* Compare to this function */
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const char *fn_name; /* Name of test */
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const char *dsc; /* Description */
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int result; /* Desired result */
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};
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#endif
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