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gen.c
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/* gen - actual generation (writing) of flex scanners */
/* Copyright (c) 1990 The Regents of the University of California. */
/* All rights reserved. */
/* This code is derived from software contributed to Berkeley by */
/* Vern Paxson. */
/* The United States Government has rights in this work pursuant */
/* to contract no. DE-AC03-76SF00098 between the United States */
/* Department of Energy and the University of California. */
/* This file is part of flex. */
/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following conditions */
/* are met: */
/* 1. Redistributions of source code must retain the above copyright */
/* notice, this list of conditions and the following disclaimer. */
/* 2. Redistributions in binary form must reproduce the above copyright */
/* notice, this list of conditions and the following disclaimer in the */
/* documentation and/or other materials provided with the distribution. */
/* Neither the name of the University nor the names of its contributors */
/* may be used to endorse or promote products derived from this software */
/* without specific prior written permission. */
/* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
/* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
/* PURPOSE. */
#include "flexdef.h"
#include "tables.h"
/* declare functions that have forward references */
void genecs(void);
static int indent_level = 0; /* each level is 8 spaces */
#define set_indent(indent_val) indent_level = indent_val
/* Almost everything is done in terms of arrays starting at 1, so provide
* a null entry for the zero element of all C arrays. (The exception
* to this is that the fast table representation generally uses the
* 0 elements of its arrays, too.)
*/
static const char *get_int16_decl (void)
{
return (gentables)
? "static const flex_int16_t %s[%d] =\n { 0,\n"
: "static const flex_int16_t * %s = 0;\n";
}
static const char *get_int32_decl (void)
{
return (gentables)
? "static const flex_int32_t %s[%d] =\n { 0,\n"
: "static const flex_int32_t * %s = 0;\n";
}
static const char *get_state_decl (void)
{
return (gentables)
? "static const yy_state_type %s[%d] =\n { 0,\n"
: "static const yy_state_type * %s = 0;\n";
}
static const char *get_yy_char_decl (void)
{
return (gentables)
? "static const YY_CHAR %s[%d] =\n { 0,\n"
: "static const YY_CHAR * %s = 0;\n";
}
/* Indent to the current level. */
void do_indent (void)
{
int i = indent_level * 8;
while (i >= 8) {
outc ('\t');
i -= 8;
}
while (i > 0) {
outc (' ');
--i;
}
}
/** Make the table for possible eol matches.
* @return the newly allocated rule_can_match_eol table
*/
static struct yytbl_data *mkeoltbl (void)
{
int i;
flex_int8_t *tdata = 0;
struct yytbl_data *tbl;
tbl = calloc(1, sizeof (struct yytbl_data));
yytbl_data_init (tbl, YYTD_ID_RULE_CAN_MATCH_EOL);
tbl->td_flags = YYTD_DATA8;
tbl->td_lolen = (flex_uint32_t) (num_rules + 1);
tbl->td_data = tdata =
calloc(tbl->td_lolen, sizeof (flex_int8_t));
for (i = 1; i <= num_rules; i++)
tdata[i] = rule_has_nl[i] ? 1 : 0;
buf_prints (&yydmap_buf,
"\t{YYTD_ID_RULE_CAN_MATCH_EOL, (void**)&yy_rule_can_match_eol, sizeof(%s)},\n",
"flex_int32_t");
return tbl;
}
/* Generate the table for possible eol matches. */
static void geneoltbl (void)
{
int i;
outn ("m4_ifdef( [[M4_YY_USE_LINENO]],[[");
outn ("/* Table of booleans, true if rule could match eol. */");
out_str_dec (get_int32_decl (), "yy_rule_can_match_eol",
num_rules + 1);
if (gentables) {
for (i = 1; i <= num_rules; i++) {
out_dec ("%d, ", rule_has_nl[i] ? 1 : 0);
/* format nicely, 20 numbers per line. */
if ((i % 20) == 19)
out ("\n ");
}
out (" };\n");
}
outn ("]])");
}
/* Generate the code to keep backing-up information. */
void gen_backing_up (void)
{
if (reject || num_backing_up == 0)
return;
if (fullspd)
indent_puts ("if ( yy_current_state[-1].yy_nxt )");
else
indent_puts ("if ( yy_accept[yy_current_state] )");
++indent_level;
indent_puts ("{");
indent_puts ("YY_G(yy_last_accepting_state) = yy_current_state;");
indent_puts ("YY_G(yy_last_accepting_cpos) = yy_cp;");
indent_puts ("}");
--indent_level;
}
/* Generate the code to perform the backing up. */
void gen_bu_action (void)
{
if (reject || num_backing_up == 0)
return;
set_indent (3);
indent_puts ("case 0: /* must back up */");
indent_puts ("/* undo the effects of YY_DO_BEFORE_ACTION */");
indent_puts ("*yy_cp = YY_G(yy_hold_char);");
if (fullspd || fulltbl)
indent_puts ("yy_cp = YY_G(yy_last_accepting_cpos) + 1;");
else
/* Backing-up info for compressed tables is taken \after/
* yy_cp has been incremented for the next state.
*/
indent_puts ("yy_cp = YY_G(yy_last_accepting_cpos);");
indent_puts ("yy_current_state = YY_G(yy_last_accepting_state);");
indent_puts ("goto yy_find_action;");
outc ('\n');
set_indent (0);
}
/** mkctbl - make full speed compressed transition table
* This is an array of structs; each struct a pair of integers.
* You should call mkssltbl() immediately after this.
* Then, I think, mkecstbl(). Arrrg.
* @return the newly allocated trans table
*/
static struct yytbl_data *mkctbl (void)
{
int i;
struct yytbl_data *tbl = 0;
flex_int32_t *tdata = 0, curr = 0;
int end_of_buffer_action = num_rules + 1;
buf_prints (&yydmap_buf,
"\t{YYTD_ID_TRANSITION, (void**)&yy_transition, sizeof(%s)},\n",
((tblend + numecs + 1) >= INT16_MAX
|| long_align) ? "flex_int32_t" : "flex_int16_t");
tbl = calloc(1, sizeof (struct yytbl_data));
yytbl_data_init (tbl, YYTD_ID_TRANSITION);
tbl->td_flags = YYTD_DATA32 | YYTD_STRUCT;
tbl->td_hilen = 0;
tbl->td_lolen = (flex_uint32_t) (tblend + numecs + 1); /* number of structs */
tbl->td_data = tdata =
calloc(tbl->td_lolen * 2, sizeof (flex_int32_t));
/* We want the transition to be represented as the offset to the
* next state, not the actual state number, which is what it currently
* is. The offset is base[nxt[i]] - (base of current state)]. That's
* just the difference between the starting points of the two involved
* states (to - from).
*
* First, though, we need to find some way to put in our end-of-buffer
* flags and states. We do this by making a state with absolutely no
* transitions. We put it at the end of the table.
*/
/* We need to have room in nxt/chk for two more slots: One for the
* action and one for the end-of-buffer transition. We now *assume*
* that we're guaranteed the only character we'll try to index this
* nxt/chk pair with is EOB, i.e., 0, so we don't have to make sure
* there's room for jam entries for other characters.
*/
while (tblend + 2 >= current_max_xpairs)
expand_nxt_chk ();
while (lastdfa + 1 >= current_max_dfas)
increase_max_dfas ();
base[lastdfa + 1] = tblend + 2;
nxt[tblend + 1] = end_of_buffer_action;
chk[tblend + 1] = numecs + 1;
chk[tblend + 2] = 1; /* anything but EOB */
/* So that "make test" won't show arb. differences. */
nxt[tblend + 2] = 0;
/* Make sure every state has an end-of-buffer transition and an
* action #.
*/
for (i = 0; i <= lastdfa; ++i) {
int anum = dfaacc[i].dfaacc_state;
int offset = base[i];
chk[offset] = EOB_POSITION;
chk[offset - 1] = ACTION_POSITION;
nxt[offset - 1] = anum; /* action number */
}
for (i = 0; i <= tblend; ++i) {
if (chk[i] == EOB_POSITION) {
tdata[curr++] = 0;
tdata[curr++] = base[lastdfa + 1] - i;
}
else if (chk[i] == ACTION_POSITION) {
tdata[curr++] = 0;
tdata[curr++] = nxt[i];
}
else if (chk[i] > numecs || chk[i] == 0) {
tdata[curr++] = 0;
tdata[curr++] = 0;
}
else { /* verify, transition */
tdata[curr++] = chk[i];
tdata[curr++] = base[nxt[i]] - (i - chk[i]);
}
}
/* Here's the final, end-of-buffer state. */
tdata[curr++] = chk[tblend + 1];
tdata[curr++] = nxt[tblend + 1];
tdata[curr++] = chk[tblend + 2];
tdata[curr++] = nxt[tblend + 2];
return tbl;
}
/** Make start_state_list table.
* @return the newly allocated start_state_list table
*/
static struct yytbl_data *mkssltbl (void)
{
struct yytbl_data *tbl = 0;
flex_int32_t *tdata = 0;
flex_int32_t i;
tbl = calloc(1, sizeof (struct yytbl_data));
yytbl_data_init (tbl, YYTD_ID_START_STATE_LIST);
tbl->td_flags = YYTD_DATA32 | YYTD_PTRANS;
tbl->td_hilen = 0;
tbl->td_lolen = (flex_uint32_t) (lastsc * 2 + 1);
tbl->td_data = tdata =
calloc(tbl->td_lolen, sizeof (flex_int32_t));
for (i = 0; i <= lastsc * 2; ++i)
tdata[i] = base[i];
buf_prints (&yydmap_buf,
"\t{YYTD_ID_START_STATE_LIST, (void**)&yy_start_state_list, sizeof(%s)},\n",
"struct yy_trans_info*");
return tbl;
}
/* genctbl - generates full speed compressed transition table */
void genctbl (void)
{
int i;
int end_of_buffer_action = num_rules + 1;
/* Table of verify for transition and offset to next state. */
if (gentables)
out_dec ("static const struct yy_trans_info yy_transition[%d] =\n {\n", tblend + numecs + 1);
else
outn ("static const struct yy_trans_info *yy_transition = 0;");
/* We want the transition to be represented as the offset to the
* next state, not the actual state number, which is what it currently
* is. The offset is base[nxt[i]] - (base of current state)]. That's
* just the difference between the starting points of the two involved
* states (to - from).
*
* First, though, we need to find some way to put in our end-of-buffer
* flags and states. We do this by making a state with absolutely no
* transitions. We put it at the end of the table.
*/
/* We need to have room in nxt/chk for two more slots: One for the
* action and one for the end-of-buffer transition. We now *assume*
* that we're guaranteed the only character we'll try to index this
* nxt/chk pair with is EOB, i.e., 0, so we don't have to make sure
* there's room for jam entries for other characters.
*/
while (tblend + 2 >= current_max_xpairs)
expand_nxt_chk ();
while (lastdfa + 1 >= current_max_dfas)
increase_max_dfas ();
base[lastdfa + 1] = tblend + 2;
nxt[tblend + 1] = end_of_buffer_action;
chk[tblend + 1] = numecs + 1;
chk[tblend + 2] = 1; /* anything but EOB */
/* So that "make test" won't show arb. differences. */
nxt[tblend + 2] = 0;
/* Make sure every state has an end-of-buffer transition and an
* action #.
*/
for (i = 0; i <= lastdfa; ++i) {
int anum = dfaacc[i].dfaacc_state;
int offset = base[i];
chk[offset] = EOB_POSITION;
chk[offset - 1] = ACTION_POSITION;
nxt[offset - 1] = anum; /* action number */
}
for (i = 0; i <= tblend; ++i) {
if (chk[i] == EOB_POSITION)
transition_struct_out (0, base[lastdfa + 1] - i);
else if (chk[i] == ACTION_POSITION)
transition_struct_out (0, nxt[i]);
else if (chk[i] > numecs || chk[i] == 0)
transition_struct_out (0, 0); /* unused slot */
else /* verify, transition */
transition_struct_out (chk[i],
base[nxt[i]] - (i -
chk[i]));
}
/* Here's the final, end-of-buffer state. */
transition_struct_out (chk[tblend + 1], nxt[tblend + 1]);
transition_struct_out (chk[tblend + 2], nxt[tblend + 2]);
if (gentables)
outn (" };\n");
/* Table of pointers to start states. */
if (gentables)
out_dec ("static const struct yy_trans_info *yy_start_state_list[%d] =\n", lastsc * 2 + 1);
else
outn ("static const struct yy_trans_info **yy_start_state_list =0;");
if (gentables) {
outn (" {");
for (i = 0; i <= lastsc * 2; ++i)
out_dec (" &yy_transition[%d],\n", base[i]);
dataend ();
}
if (useecs)
genecs ();
}
/* mkecstbl - Make equivalence-class tables. */
static struct yytbl_data *mkecstbl (void)
{
int i;
struct yytbl_data *tbl = 0;
flex_int32_t *tdata = 0;
tbl = calloc(1, sizeof (struct yytbl_data));
yytbl_data_init (tbl, YYTD_ID_EC);
tbl->td_flags |= YYTD_DATA32;
tbl->td_hilen = 0;
tbl->td_lolen = (flex_uint32_t) csize;
tbl->td_data = tdata =
calloc(tbl->td_lolen, sizeof (flex_int32_t));
for (i = 1; i < csize; ++i) {
ecgroup[i] = ABS (ecgroup[i]);
tdata[i] = ecgroup[i];
}
buf_prints (&yydmap_buf,
"\t{YYTD_ID_EC, (void**)&yy_ec, sizeof(%s)},\n",
"YY_CHAR");
return tbl;
}
/* Generate equivalence-class tables. */
void genecs (void)
{
int i, j;
int numrows;
out_str_dec (get_yy_char_decl (), "yy_ec", csize);
for (i = 1; i < csize; ++i) {
ecgroup[i] = ABS (ecgroup[i]);
mkdata (ecgroup[i]);
}
dataend ();
if (trace) {
fputs (_("\n\nEquivalence Classes:\n\n"), stderr);
numrows = csize / 8;
for (j = 0; j < numrows; ++j) {
for (i = j; i < csize; i = i + numrows) {
fprintf (stderr, "%4s = %-2d",
readable_form (i), ecgroup[i]);
putc (' ', stderr);
}
putc ('\n', stderr);
}
}
}
/* Generate the code to find the action number. */
void gen_find_action (void)
{
if (fullspd)
indent_puts ("yy_act = yy_current_state[-1].yy_nxt;");
else if (fulltbl)
indent_puts ("yy_act = yy_accept[yy_current_state];");
else if (reject) {
indent_puts ("yy_current_state = *--YY_G(yy_state_ptr);");
indent_puts ("YY_G(yy_lp) = yy_accept[yy_current_state];");
if(reject_really_used)
outn ("find_rule: /* we branch to this label when backing up */");
indent_puts
("for ( ; ; ) /* until we find what rule we matched */");
++indent_level;
indent_puts ("{");
indent_puts
("if ( YY_G(yy_lp) && YY_G(yy_lp) < yy_accept[yy_current_state + 1] )");
++indent_level;
indent_puts ("{");
indent_puts ("yy_act = yy_acclist[YY_G(yy_lp)];");
if (variable_trailing_context_rules) {
indent_puts
("if ( yy_act & YY_TRAILING_HEAD_MASK ||");
indent_puts (" YY_G(yy_looking_for_trail_begin) )");
++indent_level;
indent_puts ("{");
indent_puts
("if ( yy_act == YY_G(yy_looking_for_trail_begin) )");
++indent_level;
indent_puts ("{");
indent_puts ("YY_G(yy_looking_for_trail_begin) = 0;");
indent_puts ("yy_act &= ~YY_TRAILING_HEAD_MASK;");
indent_puts ("break;");
indent_puts ("}");
--indent_level;
indent_puts ("}");
--indent_level;
indent_puts
("else if ( yy_act & YY_TRAILING_MASK )");
++indent_level;
indent_puts ("{");
indent_puts
("YY_G(yy_looking_for_trail_begin) = yy_act & ~YY_TRAILING_MASK;");
indent_puts
("YY_G(yy_looking_for_trail_begin) |= YY_TRAILING_HEAD_MASK;");
if (real_reject) {
/* Remember matched text in case we back up
* due to REJECT.
*/
indent_puts
("YY_G(yy_full_match) = yy_cp;");
indent_puts
("YY_G(yy_full_state) = YY_G(yy_state_ptr);");
indent_puts ("YY_G(yy_full_lp) = YY_G(yy_lp);");
}
indent_puts ("}");
--indent_level;
indent_puts ("else");
++indent_level;
indent_puts ("{");
indent_puts ("YY_G(yy_full_match) = yy_cp;");
indent_puts
("YY_G(yy_full_state) = YY_G(yy_state_ptr);");
indent_puts ("YY_G(yy_full_lp) = YY_G(yy_lp);");
indent_puts ("break;");
indent_puts ("}");
--indent_level;
indent_puts ("++YY_G(yy_lp);");
indent_puts ("goto find_rule;");
}
else {
/* Remember matched text in case we back up due to
* trailing context plus REJECT.
*/
++indent_level;
indent_puts ("{");
indent_puts ("YY_G(yy_full_match) = yy_cp;");
indent_puts ("break;");
indent_puts ("}");
--indent_level;
}
indent_puts ("}");
--indent_level;
indent_puts ("--yy_cp;");
/* We could consolidate the following two lines with those at
* the beginning, but at the cost of complaints that we're
* branching inside a loop.
*/
indent_puts ("yy_current_state = *--YY_G(yy_state_ptr);");
indent_puts ("YY_G(yy_lp) = yy_accept[yy_current_state];");
indent_puts ("}");
--indent_level;
}
else { /* compressed */
indent_puts ("yy_act = yy_accept[yy_current_state];");
if (interactive && !reject) {
/* Do the guaranteed-needed backing up to figure out
* the match.
*/
indent_puts ("if ( yy_act == 0 )");
++indent_level;
indent_puts ("{ /* have to back up */");
indent_puts
("yy_cp = YY_G(yy_last_accepting_cpos);");
indent_puts
("yy_current_state = YY_G(yy_last_accepting_state);");
indent_puts
("yy_act = yy_accept[yy_current_state];");
indent_puts ("}");
--indent_level;
}
}
}
/* mkftbl - make the full table and return the struct .
* you should call mkecstbl() after this.
*/
struct yytbl_data *mkftbl (void)
{
int i;
int end_of_buffer_action = num_rules + 1;
struct yytbl_data *tbl;
flex_int32_t *tdata = 0;
tbl = calloc(1, sizeof (struct yytbl_data));
yytbl_data_init (tbl, YYTD_ID_ACCEPT);
tbl->td_flags |= YYTD_DATA32;
tbl->td_hilen = 0; /* it's a one-dimensional array */
tbl->td_lolen = (flex_uint32_t) (lastdfa + 1);
tbl->td_data = tdata =
calloc(tbl->td_lolen, sizeof (flex_int32_t));
dfaacc[end_of_buffer_state].dfaacc_state = end_of_buffer_action;
for (i = 1; i <= lastdfa; ++i) {
int anum = dfaacc[i].dfaacc_state;
tdata[i] = anum;
if (trace && anum)
fprintf (stderr, _("state # %d accepts: [%d]\n"),
i, anum);
}
buf_prints (&yydmap_buf,
"\t{YYTD_ID_ACCEPT, (void**)&yy_accept, sizeof(%s)},\n",
long_align ? "flex_int32_t" : "flex_int16_t");
return tbl;
}
/* genftbl - generate full transition table */
void genftbl (void)
{
int i;
int end_of_buffer_action = num_rules + 1;
out_str_dec (long_align ? get_int32_decl () : get_int16_decl (),
"yy_accept", lastdfa + 1);
dfaacc[end_of_buffer_state].dfaacc_state = end_of_buffer_action;
for (i = 1; i <= lastdfa; ++i) {
int anum = dfaacc[i].dfaacc_state;
mkdata (anum);
if (trace && anum)
fprintf (stderr, _("state # %d accepts: [%d]\n"),
i, anum);
}
dataend ();
if (useecs)
genecs ();
/* Don't have to dump the actual full table entries - they were
* created on-the-fly.
*/
}
/* Generate the code to find the next compressed-table state. */
void gen_next_compressed_state (char *char_map)
{
indent_put2s ("YY_CHAR yy_c = %s;", char_map);
/* Save the backing-up info \before/ computing the next state
* because we always compute one more state than needed - we
* always proceed until we reach a jam state
*/
gen_backing_up ();
indent_puts
("while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )");
++indent_level;
indent_puts ("{");
indent_puts ("yy_current_state = (int) yy_def[yy_current_state];");
if (usemecs) {
/* We've arrange it so that templates are never chained
* to one another. This means we can afford to make a
* very simple test to see if we need to convert to
* yy_c's meta-equivalence class without worrying
* about erroneously looking up the meta-equivalence
* class twice
*/
do_indent ();
/* lastdfa + 2 is the beginning of the templates */
out_dec ("if ( yy_current_state >= %d )\n", lastdfa + 2);
++indent_level;
indent_puts ("yy_c = yy_meta[yy_c];");
--indent_level;
}
indent_puts ("}");
--indent_level;
indent_puts
("yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];");
}
/* Generate the code to find the next match. */
void gen_next_match (void)
{
/* NOTE - changes in here should be reflected in gen_next_state() and
* gen_NUL_trans().
*/
char *char_map = useecs ?
"yy_ec[YY_SC_TO_UI(*yy_cp)] " : "YY_SC_TO_UI(*yy_cp)";
char *char_map_2 = useecs ?
"yy_ec[YY_SC_TO_UI(*++yy_cp)] " : "YY_SC_TO_UI(*++yy_cp)";
if (fulltbl) {
if (gentables)
indent_put2s
("while ( (yy_current_state = yy_nxt[yy_current_state][ %s ]) > 0 )",
char_map);
else
indent_put2s
("while ( (yy_current_state = yy_nxt[yy_current_state*YY_NXT_LOLEN + %s ]) > 0 )",
char_map);
++indent_level;
if (num_backing_up > 0) {
indent_puts ("{");
gen_backing_up ();
outc ('\n');
}
indent_puts ("++yy_cp;");
if (num_backing_up > 0)
indent_puts ("}");
--indent_level;
outc ('\n');
indent_puts ("yy_current_state = -yy_current_state;");
}
else if (fullspd) {
indent_puts ("{");
indent_puts
("const struct yy_trans_info *yy_trans_info;\n");
indent_puts ("YY_CHAR yy_c;\n");
indent_put2s ("for ( yy_c = %s;", char_map);
indent_puts
(" (yy_trans_info = &yy_current_state[yy_c])->");
indent_puts ("yy_verify == yy_c;");
indent_put2s (" yy_c = %s )", char_map_2);
++indent_level;
if (num_backing_up > 0)
indent_puts ("{");
indent_puts ("yy_current_state += yy_trans_info->yy_nxt;");
if (num_backing_up > 0) {
outc ('\n');
gen_backing_up ();
indent_puts ("}");
}
--indent_level;
indent_puts ("}");
}
else { /* compressed */
indent_puts ("do");
++indent_level;
indent_puts ("{");
gen_next_state (false);
indent_puts ("++yy_cp;");
indent_puts ("}");
--indent_level;
do_indent ();
if (interactive)
out_dec ("while ( yy_base[yy_current_state] != %d );\n", jambase);
else
out_dec ("while ( yy_current_state != %d );\n",
jamstate);
if (!reject && !interactive) {
/* Do the guaranteed-needed backing up to figure out
* the match.
*/
indent_puts
("yy_cp = YY_G(yy_last_accepting_cpos);");
indent_puts
("yy_current_state = YY_G(yy_last_accepting_state);");
}
}
}
/* Generate the code to find the next state. */
void gen_next_state (int worry_about_NULs)
{ /* NOTE - changes in here should be reflected in gen_next_match() */
char char_map[256];
if (worry_about_NULs && !nultrans) {
if (useecs)
snprintf (char_map, sizeof(char_map),
"(*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : %d)",
NUL_ec);
else
snprintf (char_map, sizeof(char_map),
"(*yy_cp ? YY_SC_TO_UI(*yy_cp) : %d)",
NUL_ec);
}
else
strcpy (char_map, useecs ?
"yy_ec[YY_SC_TO_UI(*yy_cp)] " :
"YY_SC_TO_UI(*yy_cp)");
if (worry_about_NULs && nultrans) {
if (!fulltbl && !fullspd)
/* Compressed tables back up *before* they match. */
gen_backing_up ();
indent_puts ("if ( *yy_cp )");
++indent_level;
indent_puts ("{");
}
if (fulltbl) {
if (gentables)
indent_put2s
("yy_current_state = yy_nxt[yy_current_state][%s];",
char_map);
else
indent_put2s
("yy_current_state = yy_nxt[yy_current_state*YY_NXT_LOLEN + %s];",
char_map);
}
else if (fullspd)
indent_put2s
("yy_current_state += yy_current_state[%s].yy_nxt;",
char_map);
else
gen_next_compressed_state (char_map);
if (worry_about_NULs && nultrans) {
indent_puts ("}");
--indent_level;
indent_puts ("else");
++indent_level;
indent_puts
("yy_current_state = yy_NUL_trans[yy_current_state];");
--indent_level;
}
if (fullspd || fulltbl)
gen_backing_up ();
if (reject)
indent_puts ("*YY_G(yy_state_ptr)++ = yy_current_state;");
}
/* Generate the code to make a NUL transition. */
void gen_NUL_trans (void)
{ /* NOTE - changes in here should be reflected in gen_next_match() */
/* Only generate a definition for "yy_cp" if we'll generate code
* that uses it. Otherwise lint and the like complain.
*/
int need_backing_up = (num_backing_up > 0 && !reject);
if (need_backing_up && (!nultrans || fullspd || fulltbl))
/* We're going to need yy_cp lying around for the call
* below to gen_backing_up().
*/
indent_puts ("char *yy_cp = YY_G(yy_c_buf_p);");
outc ('\n');
if (nultrans) {
indent_puts
("yy_current_state = yy_NUL_trans[yy_current_state];");
indent_puts ("yy_is_jam = (yy_current_state == 0);");
}
else if (fulltbl) {
do_indent ();
if (gentables)
out_dec ("yy_current_state = yy_nxt[yy_current_state][%d];\n", NUL_ec);
else
out_dec ("yy_current_state = yy_nxt[yy_current_state*YY_NXT_LOLEN + %d];\n", NUL_ec);
indent_puts ("yy_is_jam = (yy_current_state <= 0);");
}
else if (fullspd) {
do_indent ();
out_dec ("int yy_c = %d;\n", NUL_ec);
indent_puts
("const struct yy_trans_info *yy_trans_info;\n");
indent_puts
("yy_trans_info = &yy_current_state[(unsigned int) yy_c];");
indent_puts ("yy_current_state += yy_trans_info->yy_nxt;");
indent_puts
("yy_is_jam = (yy_trans_info->yy_verify != yy_c);");
}
else {
char NUL_ec_str[20];
snprintf (NUL_ec_str, sizeof(NUL_ec_str), "%d", NUL_ec);
gen_next_compressed_state (NUL_ec_str);
do_indent ();
out_dec ("yy_is_jam = (yy_current_state == %d);\n",
jamstate);
if (reject) {
/* Only stack this state if it's a transition we
* actually make. If we stack it on a jam, then
* the state stack and yy_c_buf_p get out of sync.
*/
indent_puts ("if ( ! yy_is_jam )");
++indent_level;
indent_puts
("*YY_G(yy_state_ptr)++ = yy_current_state;");
--indent_level;
}
}
/* If we've entered an accepting state, back up; note that
* compressed tables have *already* done such backing up, so
* we needn't bother with it again.