bird/filter/decl.m4

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m4_divert(-1)m4_dnl
#
# BIRD -- Construction of per-instruction structures
#
# (c) 2018 Maria Matejka <mq@jmq.cz>
#
# Can be freely distributed and used under the terms of the GNU GPL.
#
# THIS IS A M4 MACRO FILE GENERATING 3 FILES ALTOGETHER.
# KEEP YOUR HANDS OFF UNLESS YOU KNOW WHAT YOU'RE DOING.
# EDITING AND DEBUGGING THIS FILE MAY DAMAGE YOUR BRAIN SERIOUSLY.
#
# But you're welcome to read and edit and debug if you aren't scared.
#
# Uncomment the following line to get exhaustive debug output.
# m4_debugmode(aceflqtx)
#
# How it works:
# 1) Instruction to code conversion (uses diversions 100..199)
# 2) Code wrapping (uses diversions 1..99)
# 3) Final preparation (uses diversions 200..299)
# 4) Shipout
#
# See below for detailed description.
#
#
# 1) Instruction to code conversion
# The code provided in f-inst.c between consecutive INST() calls
# is interleaved for many different places. It is here processed
# and split into separate instances where split-by-instruction
# happens. These parts are stored in temporary diversions listed:
#
# 101 content of per-inst struct
# 102 constructor arguments
# 103 constructor body
# 104 dump line item content
# (there may be nothing in dump-line content and
# it must be handled specially in phase 2)
# 105 linearize body
# 106 comparator body
# 107 struct f_line_item content
# 108 interpreter body
# 109 iterator body
#
# Here are macros to allow you to _divert to the right directions.
m4_define(FID_STRUCT_IN, `m4_divert(101)')
m4_define(FID_NEW_ARGS, `m4_divert(102)')
m4_define(FID_NEW_BODY, `m4_divert(103)')
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m4_define(FID_DUMP_BODY, `m4_divert(104)m4_define([[FID_DUMP_BODY_EXISTS]])')
m4_define(FID_LINEARIZE_BODY, `m4_divert(105)')
m4_define(FID_SAME_BODY, `m4_divert(106)')
m4_define(FID_LINE_IN, `m4_divert(107)')
m4_define(FID_INTERPRET_BODY, `m4_divert(108)')
m4_define(FID_ITERATE_BODY, `m4_divert(109)')
# Sometimes you want slightly different code versions in different
# outputs.
# Use FID_HIC(code for inst-gen.h, code for inst-gen.c, code for inst-interpret.c)
# and put it into [[ ]] quotes if it shall contain commas.
m4_define(FID_HIC, `m4_ifelse(TARGET, [[H]], [[$1]], TARGET, [[I]], [[$2]], TARGET, [[C]], [[$3]])')
# In interpreter code, this is quite common.
m4_define(FID_INTERPRET_EXEC, `FID_HIC(,[[FID_INTERPRET_BODY()]],[[m4_divert(-1)]])')
m4_define(FID_INTERPRET_NEW, `FID_HIC(,[[m4_divert(-1)]],[[FID_INTERPRET_BODY()]])')
# If the instruction is never converted to constant, the interpret
# code is not produced at all for constructor
m4_define(NEVER_CONSTANT, `m4_define([[INST_NEVER_CONSTANT]])')
m4_define(FID_IFCONST, `m4_ifdef([[INST_NEVER_CONSTANT]],[[$2]],[[$1]])')
# If the instruction has some attributes (here called members),
# these are typically carried with the instruction from constructor
# to interpreter. This yields a line of code everywhere on the path.
# FID_MEMBER is a macro to help with this task.
m4_define(FID_MEMBER, `m4_dnl
FID_LINE_IN()m4_dnl
$1 $2;
FID_STRUCT_IN()m4_dnl
$1 $2;
FID_NEW_ARGS()m4_dnl
, $1 $2
FID_NEW_BODY()m4_dnl
whati->$2 = $2;
FID_LINEARIZE_BODY()m4_dnl
item->$2 = whati->$2;
m4_ifelse($3,,,[[
FID_SAME_BODY()m4_dnl
if ($3) return 0;
]])
m4_ifelse($4,,,[[
FID_DUMP_BODY()m4_dnl
debug("%s" $4 "\n", INDENT, $5);
]])
FID_INTERPRET_EXEC()m4_dnl
const $1 $2 = whati->$2
FID_INTERPRET_BODY')
# Instruction arguments are needed only until linearization is done.
# This puts the arguments into the filter line to be executed before
# the instruction itself.
#
# To achieve this, ARG_ANY must be called before anything writes into
# the instruction line as it moves the instruction pointer forward.
m4_define(ARG_ANY, `
FID_STRUCT_IN()m4_dnl
struct f_inst * f$1;
FID_NEW_ARGS()m4_dnl
, struct f_inst * f$1
FID_NEW_BODY()m4_dnl
whati->f$1 = f$1;
for (const struct f_inst *child = f$1; child; child = child->next) {
what->size += child->size;
FID_IFCONST([[
if (child->fi_code != FI_CONSTANT)
constargs = 0;
]])
}
FID_LINEARIZE_BODY
pos = linearize(dest, whati->f$1, pos);
FID_INTERPRET_BODY()')
# Some instructions accept variable number of arguments.
m4_define(VARARG, `
FID_NEW_ARGS()m4_dnl
, struct f_inst * fvar
FID_STRUCT_IN()m4_dnl
struct f_inst * fvar;
uint varcount;
FID_LINE_IN()m4_dnl
uint varcount;
FID_NEW_BODY()m4_dnl
whati->varcount = 0;
whati->fvar = fvar;
for (const struct f_inst *child = fvar; child; child = child->next, whati->varcount++) {
what->size += child->size;
FID_IFCONST([[
if (child->fi_code != FI_CONSTANT)
constargs = 0;
]])
}
FID_IFCONST([[
const struct f_inst **items = NULL;
if (constargs && whati->varcount) {
items = alloca(whati->varcount * sizeof(struct f_inst *));
const struct f_inst *child = fvar;
for (uint i=0; child; i++)
child = (items[i] = child)->next;
}
]])
FID_LINEARIZE_BODY()m4_dnl
pos = linearize(dest, whati->fvar, pos);
item->varcount = whati->varcount;
FID_DUMP_BODY()m4_dnl
debug("%snumber of varargs %u\n", INDENT, item->varcount);
FID_SAME_BODY()m4_dnl
if (f1->varcount != f2->varcount) return 0;
FID_INTERPRET_BODY()
FID_HIC(,[[
if (fstk->vcnt < whati->varcount) runtime("Stack underflow");
fstk->vcnt -= whati->varcount;
]],)
')
# Some arguments need to check their type. After that, ARG_ANY is called.
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m4_define(ARG, `ARG_ANY($1) ARG_TYPE($1,$2)')
m4_define(ARG_TYPE, `ARG_TYPE_STATIC($1,$2) ARG_TYPE_DYNAMIC($1,$2)')
m4_define(ARG_TYPE_STATIC, `
FID_NEW_BODY()m4_dnl
if (f$1->type && (f$1->type != ($2)) && !f_const_promotion(f$1, ($2)))
cf_error("Argument $1 of %s must be of type %s, got type %s",
f_instruction_name(what->fi_code), f_type_name($2), f_type_name(f$1->type));
FID_INTERPRET_BODY()')
m4_define(ARG_TYPE_DYNAMIC, `
FID_INTERPRET_EXEC()m4_dnl
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if (v$1.type != ($2))
runtime("Argument $1 of %s must be of type %s, got type %s",
f_instruction_name(what->fi_code), f_type_name($2), f_type_name(v$1.type));
FID_INTERPRET_BODY()')
m4_define(ARG_SAME_TYPE, `
FID_NEW_BODY()m4_dnl
if (f$1->type && f$2->type && (f$1->type != f$2->type) &&
!f_const_promotion(f$2, f$1->type) && !f_const_promotion(f$1, f$2->type))
cf_error("Arguments $1 and $2 of %s must be of the same type", f_instruction_name(what->fi_code));
FID_INTERPRET_BODY()')
# Executing another filter line. This replaces the recursion
# that was needed in the former implementation.
m4_define(LINEX, `FID_INTERPRET_EXEC()LINEX_($1)FID_INTERPRET_NEW()return $1 FID_INTERPRET_BODY()')
m4_define(LINEX_, `do {
fstk->estk[fstk->ecnt].pos = 0;
fstk->estk[fstk->ecnt].line = $1;
fstk->estk[fstk->ecnt].ventry = fstk->vcnt;
fstk->estk[fstk->ecnt].vbase = fstk->estk[fstk->ecnt-1].vbase;
fstk->estk[fstk->ecnt].emask = 0;
fstk->ecnt++;
} while (0)')
m4_define(LINE, `
FID_LINE_IN()m4_dnl
const struct f_line * fl$1;
FID_STRUCT_IN()m4_dnl
struct f_inst * f$1;
FID_NEW_ARGS()m4_dnl
, struct f_inst * f$1
FID_NEW_BODY()m4_dnl
whati->f$1 = f$1;
FID_DUMP_BODY()m4_dnl
f_dump_line(item->fl$1, indent + 1);
FID_LINEARIZE_BODY()m4_dnl
item->fl$1 = f_linearize(whati->f$1);
FID_SAME_BODY()m4_dnl
if (!f_same(f1->fl$1, f2->fl$1)) return 0;
FID_ITERATE_BODY()m4_dnl
if (whati->fl$1) BUFFER_PUSH(fit->lines) = whati->fl$1;
FID_INTERPRET_EXEC()m4_dnl
do { if (whati->fl$1) {
LINEX_(whati->fl$1);
} } while(0)
FID_INTERPRET_NEW()m4_dnl
return whati->f$1
FID_INTERPRET_BODY()')
# Some of the instructions have a result. These constructions
# state the result and put it to the right place.
m4_define(RESULT, `RESULT_TYPE([[$1]]) RESULT_([[$1]],[[$2]],[[$3]])')
m4_define(RESULT_, `RESULT_VAL([[ (struct f_val) { .type = $1, .val.$2 = $3 } ]])')
m4_define(RESULT_VAL, `FID_HIC(, [[do { res = $1; fstk->vcnt++; } while (0)]],
[[return fi_constant(what, $1)]])')
m4_define(RESULT_VOID, `RESULT_VAL([[ (struct f_val) { .type = T_VOID } ]])')
m4_define(ERROR,
`m4_errprint(m4___file__:m4___line__: $*
)m4_m4exit(1)')
# This macro specifies result type and makes there are no conflicting definitions
m4_define(RESULT_TYPE,
`m4_ifdef([[INST_RESULT_TYPE]],
[[m4_ifelse(INST_RESULT_TYPE,$1,,[[ERROR([[Multiple type definitons]])]])]],
[[m4_define(INST_RESULT_TYPE,$1) RESULT_TYPE_($1)]])')
m4_define(RESULT_TYPE_, `
FID_NEW_BODY()m4_dnl
what->type = $1;
FID_INTERPRET_BODY()')
# Some common filter instruction members
m4_define(SYMBOL, `FID_MEMBER(struct symbol *, sym, [[strcmp(f1->sym->name, f2->sym->name) || (f1->sym->class != f2->sym->class)]], "symbol %s", item->sym->name)')
m4_define(RTC, `FID_MEMBER(struct rtable_config *, rtc, [[strcmp(f1->rtc->name, f2->rtc->name)]], "route table %s", item->rtc->name)')
m4_define(STATIC_ATTR, `FID_MEMBER(struct f_static_attr, sa, f1->sa.sa_code != f2->sa.sa_code,,)')
m4_define(DYNAMIC_ATTR, `FID_MEMBER(struct f_dynamic_attr, da, f1->da.ea_code != f2->da.ea_code,,)')
m4_define(ACCESS_RTE, `FID_HIC(,[[do { if (!fs->rte) runtime("No route to access"); } while (0)]],NEVER_CONSTANT())')
# 2) Code wrapping
# The code produced in 1xx temporary diversions is a raw code without
# any auxiliary commands and syntactical structures around. When the
# instruction is done, INST_FLUSH is called. More precisely, it is called
# at the beginning of INST() call and at the end of file.
#
# INST_FLUSH picks all the temporary diversions, wraps their content
# into appropriate headers and structures and saves them into global
# diversions listed:
#
# 4 enum fi_code
# 5 enum fi_code to string
# 6 dump line item
# 7 dump line item callers
# 8 linearize
# 9 same (filter comparator)
# 10 iterate
# 1 union in struct f_inst
# 3 constructors + interpreter
#
# These global diversions contain blocks of code that can be directly
# put into the final file, yet it still can't be written out now as
# every instruction writes to all of these diversions.
# Code wrapping diversion names. Here we want an explicit newline
# after the C comment.
m4_define(FID_ZONE, `m4_divert($1) /* $2 for INST_NAME() */
')
m4_define(FID_INST, `FID_ZONE(1, Instruction structure for config)')
m4_define(FID_LINE, `FID_ZONE(2, Instruction structure for interpreter)')
m4_define(FID_NEW, `FID_ZONE(3, Constructor)')
m4_define(FID_ENUM, `FID_ZONE(4, Code enum)')
m4_define(FID_ENUM_STR, `FID_ZONE(5, Code enum to string)')
m4_define(FID_DUMP, `FID_ZONE(6, Dump line)')
m4_define(FID_DUMP_CALLER, `FID_ZONE(7, Dump line caller)')
m4_define(FID_LINEARIZE, `FID_ZONE(8, Linearize)')
m4_define(FID_SAME, `FID_ZONE(9, Comparison)')
m4_define(FID_ITERATE, `FID_ZONE(10, Iteration)')
# This macro does all the code wrapping. See inline comments.
m4_define(INST_FLUSH, `m4_ifdef([[INST_NAME]], [[
FID_ENUM()m4_dnl Contents of enum fi_code { ... }
INST_NAME(),
FID_ENUM_STR()m4_dnl Contents of const char * indexed by enum fi_code
[INST_NAME()] = "INST_NAME()",
FID_INST()m4_dnl Anonymous structure inside struct f_inst
struct {
m4_undivert(101)m4_dnl
} i_[[]]INST_NAME();
FID_LINE()m4_dnl Anonymous structure inside struct f_line_item
struct {
m4_undivert(107)m4_dnl
} i_[[]]INST_NAME();
FID_NEW()m4_dnl Constructor and interpreter code together
FID_HIC(
[[m4_dnl Public declaration of constructor in H file
struct f_inst *f_new_inst_]]INST_NAME()[[(enum f_instruction_code fi_code
m4_undivert(102)m4_dnl
);]],
[[m4_dnl The one case in The Big Switch inside interpreter
case INST_NAME():
#define whati (&(what->i_]]INST_NAME()[[))
m4_ifelse(m4_eval(INST_INVAL() > 0), 1, [[if (fstk->vcnt < INST_INVAL()) runtime("Stack underflow"); fstk->vcnt -= INST_INVAL(); ]])
m4_undivert(108)m4_dnl
#undef whati
break;
]],
[[m4_dnl Constructor itself
struct f_inst *f_new_inst_]]INST_NAME()[[(enum f_instruction_code fi_code
m4_undivert(102)m4_dnl
)
{
/* Allocate the structure */
struct f_inst *what = fi_new(fi_code);
FID_IFCONST([[uint constargs = 1;]])
/* Initialize all the members */
#define whati (&(what->i_]]INST_NAME()[[))
m4_undivert(103)m4_dnl
/* If not constant, return the instruction itself */
FID_IFCONST([[if (!constargs)]])
return what;
/* Try to pre-calculate the result */
FID_IFCONST([[m4_undivert(108)]])m4_dnl
#undef whati
}
]])
FID_DUMP_CALLER()m4_dnl Case in another big switch used in instruction dumping (debug)
case INST_NAME(): f_dump_line_item_]]INST_NAME()[[(item, indent + 1); break;
FID_DUMP()m4_dnl The dumper itself
m4_ifdef([[FID_DUMP_BODY_EXISTS]],
[[static inline void f_dump_line_item_]]INST_NAME()[[(const struct f_line_item *item_, const int indent)]],
[[static inline void f_dump_line_item_]]INST_NAME()[[(const struct f_line_item *item UNUSED, const int indent UNUSED)]])
m4_undefine([[FID_DUMP_BODY_EXISTS]])
{
#define item (&(item_->i_]]INST_NAME()[[))
m4_undivert(104)m4_dnl
#undef item
}
FID_LINEARIZE()m4_dnl The linearizer
case INST_NAME(): {
#define whati (&(what->i_]]INST_NAME()[[))
#define item (&(dest->items[pos].i_]]INST_NAME()[[))
m4_undivert(105)m4_dnl
#undef whati
#undef item
dest->items[pos].fi_code = what->fi_code;
dest->items[pos].lineno = what->lineno;
break;
}
FID_SAME()m4_dnl This code compares two f_line"s while reconfiguring
case INST_NAME():
#define f1 (&(f1_->i_]]INST_NAME()[[))
#define f2 (&(f2_->i_]]INST_NAME()[[))
m4_undivert(106)m4_dnl
#undef f1
#undef f2
break;
FID_ITERATE()m4_dnl The iterator
case INST_NAME():
#define whati (&(what->i_]]INST_NAME()[[))
m4_undivert(109)m4_dnl
#undef whati
break;
m4_divert(-1)FID_FLUSH(101,200)m4_dnl And finally this flushes all the unused diversions
]])')
m4_define(INST, `m4_dnl This macro is called on beginning of each instruction.
INST_FLUSH()m4_dnl First, old data is flushed
m4_define([[INST_NAME]], [[$1]])m4_dnl Then we store instruction name,
m4_define([[INST_INVAL]], [[$2]])m4_dnl instruction input value count,
m4_undefine([[INST_NEVER_CONSTANT]])m4_dnl reset NEVER_CONSTANT trigger,
m4_undefine([[INST_RESULT_TYPE]])m4_dnl and reset RESULT_TYPE value.
FID_INTERPRET_BODY()m4_dnl By default, every code is interpreter code.
')
# 3) Final preparation
#
# Now we prepare all the code around the global diversions.
# It must be here, not in m4wrap, as we want M4 to mark the code
# by #line directives correctly, not to claim that every single line
# is at the beginning of the m4wrap directive.
#
# This part is split by the final file.
# H for inst-gen.h
# I for inst-interpret.c
# C for inst-gen.c
#
# So we in cycle:
# A. open a diversion
# B. send there some code
# C. close that diversion
# D. flush a global diversion
# E. open another diversion and goto B.
#
# Final diversions
# 200+ completed text before it is flushed to output
# This is a list of output diversions
m4_define(FID_WR_PUT_LIST)
# This macro does the steps C to E, see before.
m4_define(FID_WR_PUT_ALSO, `m4_define([[FID_WR_PUT_LIST]],FID_WR_PUT_LIST()[[FID_WR_DPUT(]]FID_WR_DIDX[[)FID_WR_DPUT(]]$1[[)]])m4_define([[FID_WR_DIDX]],m4_eval(FID_WR_DIDX+1))m4_divert(FID_WR_DIDX)')
# These macros do the splitting between H/I/C
m4_define(FID_WR_DIRECT, `m4_ifelse(TARGET,[[$1]],[[FID_WR_INIT()]],[[FID_WR_STOP()]])')
m4_define(FID_WR_INIT, `m4_define([[FID_WR_DIDX]],200)m4_define([[FID_WR_PUT]],[[FID_WR_PUT_ALSO($]][[@)]])m4_divert(200)')
m4_define(FID_WR_STOP, `m4_define([[FID_WR_PUT]])m4_divert(-1)')
# Here is the direct code to be put into the output files
# together with the undiversions, being hidden under FID_WR_PUT()
m4_changequote([[,]])
FID_WR_DIRECT(I)
FID_WR_PUT(3)
FID_WR_DIRECT(C)
#if defined(__GNUC__) && __GNUC__ >= 6
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmisleading-indentation"
#endif
#include "nest/bird.h"
#include "filter/filter.h"
#include "filter/f-inst.h"
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/* Instruction codes to string */
static const char * const f_instruction_name_str[] = {
FID_WR_PUT(5)
};
const char *
f_instruction_name_(enum f_instruction_code fi)
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{
if (fi < (sizeof(f_instruction_name_str) / sizeof(f_instruction_name_str[0])))
return f_instruction_name_str[fi];
else
bug("Got unknown instruction code: %d", fi);
}
static inline struct f_inst *
fi_new(enum f_instruction_code fi_code)
{
struct f_inst *what = cfg_allocz(sizeof(struct f_inst));
what->lineno = ifs->lino;
what->size = 1;
what->fi_code = fi_code;
return what;
}
static inline struct f_inst *
fi_constant(struct f_inst *what, struct f_val val)
{
what->fi_code = FI_CONSTANT;
what->i_FI_CONSTANT.val = val;
return what;
}
static int
f_const_promotion(struct f_inst *arg, enum f_type want)
{
if (arg->fi_code != FI_CONSTANT)
return 0;
struct f_val *c = &arg->i_FI_CONSTANT.val;
if ((c->type == T_IP) && ipa_is_ip4(c->val.ip) && (want == T_QUAD)) {
*c = (struct f_val) {
.type = T_QUAD,
.val.i = ipa_to_u32(c->val.ip),
};
return 1;
}
return 0;
}
#define v1 whati->f1->i_FI_CONSTANT.val
#define v2 whati->f2->i_FI_CONSTANT.val
#define v3 whati->f3->i_FI_CONSTANT.val
#define vv(i) items[i]->i_FI_CONSTANT.val
#define runtime(fmt, ...) cf_error("filter preevaluation, line %d: " fmt, ifs->lino, ##__VA_ARGS__)
#define fpool cfg_mem
#define falloc(size) cfg_alloc(size)
/* Instruction constructors */
FID_WR_PUT(3)
#undef v1
#undef v2
#undef v3
#undef vv
/* Line dumpers */
#define INDENT (((const char *) f_dump_line_indent_str) + sizeof(f_dump_line_indent_str) - (indent) - 1)
static const char f_dump_line_indent_str[] = " ";
FID_WR_PUT(6)
void f_dump_line(const struct f_line *dest, uint indent)
{
if (!dest) {
debug("%sNo filter line (NULL)\n", INDENT);
return;
}
debug("%sFilter line %p (len=%u)\n", INDENT, dest, dest->len);
for (uint i=0; i<dest->len; i++) {
const struct f_line_item *item = &dest->items[i];
debug("%sInstruction %s at line %u\n", INDENT, f_instruction_name_(item->fi_code), item->lineno);
switch (item->fi_code) {
FID_WR_PUT(7)
default: bug("Unknown instruction %x in f_dump_line", item->fi_code);
}
}
debug("%sFilter line %p dump done\n", INDENT, dest);
}
/* Linearize */
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static uint
linearize(struct f_line *dest, const struct f_inst *what, uint pos)
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{
for ( ; what; what = what->next) {
switch (what->fi_code) {
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FID_WR_PUT(8)
}
pos++;
}
return pos;
}
struct f_line *
f_linearize_concat(const struct f_inst * const inst[], uint count)
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{
uint len = 0;
for (uint i=0; i<count; i++)
for (const struct f_inst *what = inst[i]; what; what = what->next)
len += what->size;
struct f_line *out = cfg_allocz(sizeof(struct f_line) + sizeof(struct f_line_item)*len);
for (uint i=0; i<count; i++)
out->len = linearize(out, inst[i], out->len);
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#ifdef LOCAL_DEBUG
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f_dump_line(out, 0);
#endif
return out;
}
/* Filter line comparison */
int
f_same(const struct f_line *fl1, const struct f_line *fl2)
{
if ((!fl1) && (!fl2))
return 1;
if ((!fl1) || (!fl2))
return 0;
if (fl1->len != fl2->len)
return 0;
for (uint i=0; i<fl1->len; i++) {
#define f1_ (&(fl1->items[i]))
#define f2_ (&(fl2->items[i]))
if (f1_->fi_code != f2_->fi_code)
return 0;
if (f1_->flags != f2_->flags)
return 0;
switch(f1_->fi_code) {
FID_WR_PUT(9)
}
}
#undef f1_
#undef f2_
return 1;
}
/* Part of FI_SWITCH filter iterator */
static void
f_add_tree_lines(const struct f_tree *t, void *fit_)
{
struct filter_iterator * fit = fit_;
if (t->data)
BUFFER_PUSH(fit->lines) = t->data;
}
/* Filter line iterator */
void
f_add_lines(const struct f_line_item *what, struct filter_iterator *fit)
{
switch(what->fi_code) {
FID_WR_PUT(10)
}
}
#if defined(__GNUC__) && __GNUC__ >= 6
#pragma GCC diagnostic pop
#endif
FID_WR_DIRECT(H)
/* Filter instruction codes */
enum f_instruction_code {
FID_WR_PUT(4)m4_dnl
} PACKED;
/* Filter instruction structure for config */
struct f_inst {
struct f_inst *next; /* Next instruction */
enum f_instruction_code fi_code; /* Instruction code */
enum f_type type; /* Type of returned value, if known */
int size; /* How many instructions are underneath */
int lineno; /* Line number */
union {
FID_WR_PUT(1)m4_dnl
};
};
/* Filter line item */
struct f_line_item {
enum f_instruction_code fi_code; /* What to do */
enum f_instruction_flags flags; /* Flags, instruction-specific */
uint lineno; /* Where */
union {
FID_WR_PUT(2)m4_dnl
};
};
/* Instruction constructors */
FID_WR_PUT(3)
m4_divert(-1)
# 4) Shipout
#
# Everything is prepared in FID_WR_PUT_LIST now. Let's go!
m4_changequote(`,')
# Flusher auxiliary macro
m4_define(FID_FLUSH, `m4_ifelse($1,$2,,[[m4_undivert($1)FID_FLUSH(m4_eval($1+1),$2)]])')
# Defining the macro used in FID_WR_PUT_LIST
m4_define(FID_WR_DPUT, `m4_undivert($1)')
# After the code is read and parsed, we:
m4_m4wrap(`INST_FLUSH()m4_divert(0)FID_WR_PUT_LIST()m4_divert(-1)FID_FLUSH(1,200)')
m4_changequote([[,]])
# And now M4 is going to parse f-inst.c, fill the diversions
# and after the file is done, the content of m4_m4wrap (see before)
# is executed.