/* $OpenBSD: gen.c,v 1.4 1998/11/24 01:21:36 deraadt Exp $ */ /* 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. * * Redistribution and use in source and binary forms are permitted provided * that: (1) source distributions retain this entire copyright notice and * comment, and (2) distributions including binaries display the following * acknowledgement: ``This product includes software developed by the * University of California, Berkeley and its contributors'' in the * documentation or other materials provided with the distribution and in * all advertising materials mentioning features or use of this software. * 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. */ /* $Header: /cvs/OpenBSD/src/usr.bin/lex/gen.c,v 1.4 1998/11/24 01:21:36 deraadt Exp $ */ #include "flexdef.h" /* declare functions that have forward references */ void gen_next_state PROTO((int)); void genecs PROTO((void)); void indent_put2s PROTO((char [], char [])); void indent_puts PROTO((char [])); static int indent_level = 0; /* each level is 8 spaces */ #define indent_up() (++indent_level) #define indent_down() (--indent_level) #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 char C_int_decl[] = "static yyconst int %s[%d] =\n { 0,\n"; static char C_short_decl[] = "static yyconst short int %s[%d] =\n { 0,\n"; static char C_long_decl[] = "static yyconst long int %s[%d] =\n { 0,\n"; static char C_state_decl[] = "static yyconst yy_state_type %s[%d] =\n { 0,\n"; /* Indent to the current level. */ void do_indent() { register int i = indent_level * 8; while ( i >= 8 ) { outc( '\t' ); i -= 8; } while ( i > 0 ) { outc( ' ' ); --i; } } /* Generate the code to keep backing-up information. */ void gen_backing_up() { 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_up(); indent_puts( "{" ); indent_puts( "yy_last_accepting_state = yy_current_state;" ); indent_puts( "yy_last_accepting_cpos = yy_cp;" ); indent_puts( "}" ); indent_down(); } /* Generate the code to perform the backing up. */ void gen_bu_action() { 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_hold_char;" ); if ( fullspd || fulltbl ) indent_puts( "yy_cp = 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_last_accepting_cpos;" ); indent_puts( "yy_current_state = yy_last_accepting_state;" ); indent_puts( "goto yy_find_action;" ); outc( '\n' ); set_indent( 0 ); } /* genctbl - generates full speed compressed transition table */ void genctbl() { register int i; int end_of_buffer_action = num_rules + 1; /* Table of verify for transition and offset to next state. */ out_dec( "static yyconst struct yy_trans_info yy_transition[%d] =\n", tblend + numecs + 1 ); outn( " {" ); /* 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] ); outn( " };\n" ); /* Table of pointers to start states. */ out_dec( "static yyconst struct yy_trans_info *yy_start_state_list[%d] =\n", lastsc * 2 + 1 ); outn( " {" ); /* } so vi doesn't get confused */ for ( i = 0; i <= lastsc * 2; ++i ) out_dec( " &yy_transition[%d],\n", base[i] ); dataend(); if ( useecs ) genecs(); } /* Generate equivalence-class tables. */ void genecs() { register int i, j; int numrows; out_str_dec( C_int_decl, "yy_ec", csize ); for ( i = 1; i < csize; ++i ) { if ( caseins && (i >= 'A') && (i <= 'Z') ) ecgroup[i] = ecgroup[clower( 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() { 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_state_ptr;" ); indent_puts( "yy_lp = yy_accept[yy_current_state];" ); outn( "find_rule: /* we branch to this label when backing up */" ); indent_puts( "for ( ; ; ) /* until we find what rule we matched */" ); indent_up(); indent_puts( "{" ); indent_puts( "if ( yy_lp && yy_lp < yy_accept[yy_current_state + 1] )" ); indent_up(); indent_puts( "{" ); indent_puts( "yy_act = yy_acclist[yy_lp];" ); if ( variable_trailing_context_rules ) { indent_puts( "if ( yy_act & YY_TRAILING_HEAD_MASK ||" ); indent_puts( " yy_looking_for_trail_begin )" ); indent_up(); indent_puts( "{" ); indent_puts( "if ( yy_act == yy_looking_for_trail_begin )" ); indent_up(); indent_puts( "{" ); indent_puts( "yy_looking_for_trail_begin = 0;" ); indent_puts( "yy_act &= ~YY_TRAILING_HEAD_MASK;" ); indent_puts( "break;" ); indent_puts( "}" ); indent_down(); indent_puts( "}" ); indent_down(); indent_puts( "else if ( yy_act & YY_TRAILING_MASK )" ); indent_up(); indent_puts( "{" ); indent_puts( "yy_looking_for_trail_begin = yy_act & ~YY_TRAILING_MASK;" ); indent_puts( "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_full_match = yy_cp;" ); indent_puts( "yy_full_state = yy_state_ptr;" ); indent_puts( "yy_full_lp = yy_lp;" ); } indent_puts( "}" ); indent_down(); indent_puts( "else" ); indent_up(); indent_puts( "{" ); indent_puts( "yy_full_match = yy_cp;" ); indent_puts( "yy_full_state = yy_state_ptr;" ); indent_puts( "yy_full_lp = yy_lp;" ); indent_puts( "break;" ); indent_puts( "}" ); indent_down(); indent_puts( "++yy_lp;" ); indent_puts( "goto find_rule;" ); } else { /* Remember matched text in case we back up due to * trailing context plus REJECT. */ indent_up(); indent_puts( "{" ); indent_puts( "yy_full_match = yy_cp;" ); indent_puts( "break;" ); indent_puts( "}" ); indent_down(); } indent_puts( "}" ); indent_down(); 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_state_ptr;" ); indent_puts( "yy_lp = yy_accept[yy_current_state];" ); indent_puts( "}" ); indent_down(); } 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_up(); indent_puts( "{ /* have to back up */" ); indent_puts( "yy_cp = yy_last_accepting_cpos;" ); indent_puts( "yy_current_state = yy_last_accepting_state;" ); indent_puts( "yy_act = yy_accept[yy_current_state];" ); indent_puts( "}" ); indent_down(); } } } /* genftbl - generate full transition table */ void genftbl() { register int i; int end_of_buffer_action = num_rules + 1; out_str_dec( long_align ? C_long_decl : C_short_decl, "yy_accept", lastdfa + 1 ); dfaacc[end_of_buffer_state].dfaacc_state = end_of_buffer_action; for ( i = 1; i <= lastdfa; ++i ) { register 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_map ) char *char_map; { indent_put2s( "register 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_up(); 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_up(); indent_puts( "yy_c = yy_meta[(unsigned int) yy_c];" ); indent_down(); } indent_puts( "}" ); indent_down(); indent_puts( "yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];" ); } /* Generate the code to find the next match. */ void gen_next_match() { /* 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 ) { indent_put2s( "while ( (yy_current_state = yy_nxt[yy_current_state][%s]) > 0 )", char_map ); indent_up(); if ( num_backing_up > 0 ) { indent_puts( "{" ); /* } for vi */ gen_backing_up(); outc( '\n' ); } indent_puts( "++yy_cp;" ); if ( num_backing_up > 0 ) /* { for vi */ indent_puts( "}" ); indent_down(); outc( '\n' ); indent_puts( "yy_current_state = -yy_current_state;" ); } else if ( fullspd ) { indent_puts( "{" ); /* } for vi */ indent_puts( "register yyconst struct yy_trans_info *yy_trans_info;\n" ); indent_puts( "register YY_CHAR yy_c;\n" ); indent_put2s( "for ( yy_c = %s;", char_map ); indent_puts( " (yy_trans_info = &yy_current_state[(unsigned int) yy_c])->" ); indent_puts( "yy_verify == yy_c;" ); indent_put2s( " yy_c = %s )", char_map_2 ); indent_up(); if ( num_backing_up > 0 ) indent_puts( "{" ); /* } for vi */ indent_puts( "yy_current_state += yy_trans_info->yy_nxt;" ); if ( num_backing_up > 0 ) { outc( '\n' ); gen_backing_up(); /* { for vi */ indent_puts( "}" ); } indent_down(); /* { for vi */ indent_puts( "}" ); } else { /* compressed */ indent_puts( "do" ); indent_up(); indent_puts( "{" ); /* } for vi */ gen_next_state( false ); indent_puts( "++yy_cp;" ); /* { for vi */ indent_puts( "}" ); indent_down(); 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_last_accepting_cpos;" ); indent_puts( "yy_current_state = yy_last_accepting_state;" ); } } } /* Generate the code to find the next state. */ void gen_next_state( worry_about_NULs ) 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 ) (void) sprintf( char_map, "(*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : %d)", NUL_ec ); else (void) sprintf( 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_up(); indent_puts( "{" ); /* } for vi */ } if ( fulltbl ) indent_put2s( "yy_current_state = yy_nxt[yy_current_state][%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 ) { /* { for vi */ indent_puts( "}" ); indent_down(); indent_puts( "else" ); indent_up(); indent_puts( "yy_current_state = yy_NUL_trans[yy_current_state];" ); indent_down(); } if ( fullspd || fulltbl ) gen_backing_up(); if ( reject ) indent_puts( "*yy_state_ptr++ = yy_current_state;" ); } /* Generate the code to make a NUL transition. */ void gen_NUL_trans() { /* 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( "register char *yy_cp = 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(); out_dec( "yy_current_state = yy_nxt[yy_current_state][%d];\n", NUL_ec ); indent_puts( "yy_is_jam = (yy_current_state <= 0);" ); } else if ( fullspd ) { do_indent(); out_dec( "register int yy_c = %d;\n", NUL_ec ); indent_puts( "register yyconst 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]; (void) sprintf( 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_up(); indent_puts( "*yy_state_ptr++ = yy_current_state;" ); indent_down(); } } /* 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. */ if ( need_backing_up && (fullspd || fulltbl) ) { outc( '\n' ); indent_puts( "if ( ! yy_is_jam )" ); indent_up(); indent_puts( "{" ); gen_backing_up(); indent_puts( "}" ); indent_down(); } } /* Generate the code to find the start state. */ void gen_start_state() { if ( fullspd ) { if ( bol_needed ) { indent_puts( "yy_current_state = yy_start_state_list[yy_start + YY_AT_BOL()];" ); } else indent_puts( "yy_current_state = yy_start_state_list[yy_start];" ); } else { indent_puts( "yy_current_state = yy_start;" ); if ( bol_needed ) indent_puts( "yy_current_state += YY_AT_BOL();" ); if ( reject ) { /* Set up for storing up states. */ indent_puts( "yy_state_ptr = yy_state_buf;" ); indent_puts( "*yy_state_ptr++ = yy_current_state;" ); } } } /* gentabs - generate data statements for the transition tables */ void gentabs() { int i, j, k, *accset, nacc, *acc_array, total_states; int end_of_buffer_action = num_rules + 1; acc_array = allocate_integer_array( current_max_dfas ); nummt = 0; /* The compressed table format jams by entering the "jam state", * losing information about the previous state in the process. * In order to recover the previous state, we effectively need * to keep backing-up information. */ ++num_backing_up; if ( reject ) { /* Write out accepting list and pointer list. * * First we generate the "yy_acclist" array. In the process, * we compute the indices that will go into the "yy_accept" * array, and save the indices in the dfaacc array. */ int EOB_accepting_list[2]; /* Set up accepting structures for the End Of Buffer state. */ EOB_accepting_list[0] = 0; EOB_accepting_list[1] = end_of_buffer_action; accsiz[end_of_buffer_state] = 1; dfaacc[end_of_buffer_state].dfaacc_set = EOB_accepting_list; out_str_dec( long_align ? C_long_decl : C_short_decl, "yy_acclist", MAX( numas, 1 ) + 1 ); j = 1; /* index into "yy_acclist" array */ for ( i = 1; i <= lastdfa; ++i ) { acc_array[i] = j; if ( accsiz[i] != 0 ) { accset = dfaacc[i].dfaacc_set; nacc = accsiz[i]; if ( trace ) fprintf( stderr, _( "state # %d accepts: " ), i ); for ( k = 1; k <= nacc; ++k ) { int accnum = accset[k]; ++j; if ( variable_trailing_context_rules && ! (accnum & YY_TRAILING_HEAD_MASK) && accnum > 0 && accnum <= num_rules && rule_type[accnum] == RULE_VARIABLE ) { /* Special hack to flag * accepting number as part * of trailing context rule. */ accnum |= YY_TRAILING_MASK; } mkdata( accnum ); if ( trace ) { fprintf( stderr, "[%d]", accset[k] ); if ( k < nacc ) fputs( ", ", stderr ); else putc( '\n', stderr ); } } } } /* add accepting number for the "jam" state */ acc_array[i] = j; dataend(); } else { dfaacc[end_of_buffer_state].dfaacc_state = end_of_buffer_action; for ( i = 1; i <= lastdfa; ++i ) acc_array[i] = dfaacc[i].dfaacc_state; /* add accepting number for jam state */ acc_array[i] = 0; } /* Spit out "yy_accept" array. If we're doing "reject", it'll be * pointers into the "yy_acclist" array. Otherwise it's actual * accepting numbers. In either case, we just dump the numbers. */ /* "lastdfa + 2" is the size of "yy_accept"; includes room for C arrays * beginning at 0 and for "jam" state. */ k = lastdfa + 2; if ( reject ) /* We put a "cap" on the table associating lists of accepting * numbers with state numbers. This is needed because we tell * where the end of an accepting list is by looking at where * the list for the next state starts. */ ++k; out_str_dec( long_align ? C_long_decl : C_short_decl, "yy_accept", k ); for ( i = 1; i <= lastdfa; ++i ) { mkdata( acc_array[i] ); if ( ! reject && trace && acc_array[i] ) fprintf( stderr, _( "state # %d accepts: [%d]\n" ), i, acc_array[i] ); } /* Add entry for "jam" state. */ mkdata( acc_array[i] ); if ( reject ) /* Add "cap" for the list. */ mkdata( acc_array[i] ); dataend(); if ( useecs ) genecs(); if ( usemecs ) { /* Write out meta-equivalence classes (used to index * templates with). */ if ( trace ) fputs( _( "\n\nMeta-Equivalence Classes:\n" ), stderr ); out_str_dec( C_int_decl, "yy_meta", numecs + 1 ); for ( i = 1; i <= numecs; ++i ) { if ( trace ) fprintf( stderr, "%d = %d\n", i, ABS( tecbck[i] ) ); mkdata( ABS( tecbck[i] ) ); } dataend(); } total_states = lastdfa + numtemps; out_str_dec( (tblend >= MAX_SHORT || long_align) ? C_long_decl : C_short_decl, "yy_base", total_states + 1 ); for ( i = 1; i <= lastdfa; ++i ) { register int d = def[i]; if ( base[i] == JAMSTATE ) base[i] = jambase; if ( d == JAMSTATE ) def[i] = jamstate; else if ( d < 0 ) { /* Template reference. */ ++tmpuses; def[i] = lastdfa - d + 1; } mkdata( base[i] ); } /* Generate jam state's base index. */ mkdata( base[i] ); for ( ++i /* skip jam state */; i <= total_states; ++i ) { mkdata( base[i] ); def[i] = jamstate; } dataend(); out_str_dec( (total_states >= MAX_SHORT || long_align) ? C_long_decl : C_short_decl, "yy_def", total_states + 1 ); for ( i = 1; i <= total_states; ++i ) mkdata( def[i] ); dataend(); out_str_dec( (total_states >= MAX_SHORT || long_align) ? C_long_decl : C_short_decl, "yy_nxt", tblend + 1 ); for ( i = 1; i <= tblend; ++i ) { /* Note, the order of the following test is important. * If chk[i] is 0, then nxt[i] is undefined. */ if ( chk[i] == 0 || nxt[i] == 0 ) nxt[i] = jamstate; /* new state is the JAM state */ mkdata( nxt[i] ); } dataend(); out_str_dec( (total_states >= MAX_SHORT || long_align) ? C_long_decl : C_short_decl, "yy_chk", tblend + 1 ); for ( i = 1; i <= tblend; ++i ) { if ( chk[i] == 0 ) ++nummt; mkdata( chk[i] ); } dataend(); free(acc_array); } /* Write out a formatted string (with a secondary string argument) at the * current indentation level, adding a final newline. */ void indent_put2s( fmt, arg ) char fmt[], arg[]; { do_indent(); out_str( fmt, arg ); outn( "" ); } /* Write out a string at the current indentation level, adding a final * newline. */ void indent_puts( str ) char str[]; { do_indent(); outn( str ); } /* make_tables - generate transition tables and finishes generating output file */ void make_tables() { register int i; int did_eof_rule = false; skelout(); /* First, take care of YY_DO_BEFORE_ACTION depending on yymore * being used. */ set_indent( 1 ); if ( yymore_used && ! yytext_is_array ) { indent_puts( "yytext_ptr -= yy_more_len; \\" ); indent_puts( "yyleng = (int) (yy_cp - yytext_ptr); \\" ); } else indent_puts( "yyleng = (int) (yy_cp - yy_bp); \\" ); /* Now also deal with copying yytext_ptr to yytext if needed. */ skelout(); if ( yytext_is_array ) { if ( yymore_used ) indent_puts( "if ( yyleng + yy_more_offset >= YYLMAX ) \\" ); else indent_puts( "if ( yyleng >= YYLMAX ) \\" ); indent_up(); indent_puts( "YY_FATAL_ERROR( \"token too large, exceeds YYLMAX\" ); \\" ); indent_down(); if ( yymore_used ) { indent_puts( "yy_flex_strncpy( &yytext[yy_more_offset], yytext_ptr, yyleng + 1 ); \\" ); indent_puts( "yyleng += yy_more_offset; \\" ); indent_puts( "yy_prev_more_offset = yy_more_offset; \\" ); indent_puts( "yy_more_offset = 0; \\" ); } else { indent_puts( "yy_flex_strncpy( yytext, yytext_ptr, yyleng + 1 ); \\" ); } } set_indent( 0 ); skelout(); out_dec( "#define YY_NUM_RULES %d\n", num_rules ); out_dec( "#define YY_END_OF_BUFFER %d\n", num_rules + 1 ); if ( fullspd ) { /* Need to define the transet type as a size large * enough to hold the biggest offset. */ int total_table_size = tblend + numecs + 1; char *trans_offset_type = (total_table_size >= MAX_SHORT || long_align) ? "long" : "short"; set_indent( 0 ); indent_puts( "struct yy_trans_info" ); indent_up(); indent_puts( "{" ); /* } for vi */ if ( long_align ) indent_puts( "long yy_verify;" ); else indent_puts( "short yy_verify;" ); /* In cases where its sister yy_verify *is* a "yes, there is * a transition", yy_nxt is the offset (in records) to the * next state. In most cases where there is no transition, * the value of yy_nxt is irrelevant. If yy_nxt is the -1th * record of a state, though, then yy_nxt is the action number * for that state. */ indent_put2s( "%s yy_nxt;", trans_offset_type ); indent_puts( "};" ); indent_down(); } if ( fullspd ) genctbl(); else if ( fulltbl ) genftbl(); else gentabs(); /* Definitions for backing up. We don't need them if REJECT * is being used because then we use an alternative backin-up * technique instead. */ if ( num_backing_up > 0 && ! reject ) { if ( ! C_plus_plus ) { indent_puts( "static yy_state_type yy_last_accepting_state;" ); indent_puts( "static char *yy_last_accepting_cpos;\n" ); } } if ( nultrans ) { out_str_dec( C_state_decl, "yy_NUL_trans", lastdfa + 1 ); for ( i = 1; i <= lastdfa; ++i ) { if ( fullspd ) out_dec( " &yy_transition[%d],\n", base[i] ); else mkdata( nultrans[i] ); } dataend(); } if ( ddebug ) { /* Spit out table mapping rules to line numbers. */ if ( ! C_plus_plus ) { indent_puts( "extern int yy_flex_debug;" ); indent_puts( "int yy_flex_debug = 1;\n" ); } out_str_dec( long_align ? C_long_decl : C_short_decl, "yy_rule_linenum", num_rules ); for ( i = 1; i < num_rules; ++i ) mkdata( rule_linenum[i] ); dataend(); } if ( reject ) { /* Declare state buffer variables. */ if ( ! C_plus_plus ) { outn( "static yy_state_type yy_state_buf[YY_BUF_SIZE + 2], *yy_state_ptr;" ); outn( "static char *yy_full_match;" ); outn( "static int yy_lp;" ); } if ( variable_trailing_context_rules ) { if ( ! C_plus_plus ) { outn( "static int yy_looking_for_trail_begin = 0;" ); outn( "static int yy_full_lp;" ); outn( "static int *yy_full_state;" ); } out_hex( "#define YY_TRAILING_MASK 0x%x\n", (unsigned int) YY_TRAILING_MASK ); out_hex( "#define YY_TRAILING_HEAD_MASK 0x%x\n", (unsigned int) YY_TRAILING_HEAD_MASK ); } outn( "#define REJECT \\" ); outn( "{ \\" ); /* } for vi */ outn( "*yy_cp = yy_hold_char; /* undo effects of setting up yytext */ \\" ); outn( "yy_cp = yy_full_match; /* restore poss. backed-over text */ \\" ); if ( variable_trailing_context_rules ) { outn( "yy_lp = yy_full_lp; /* restore orig. accepting pos. */ \\" ); outn( "yy_state_ptr = yy_full_state; /* restore orig. state */ \\" ); outn( "yy_current_state = *yy_state_ptr; /* restore curr. state */ \\" ); } outn( "++yy_lp; \\" ); outn( "goto find_rule; \\" ); /* { for vi */ outn( "}" ); } else { outn( "/* The intent behind this definition is that it'll catch" ); outn( " * any uses of REJECT which flex missed." ); outn( " */" ); outn( "#define REJECT reject_used_but_not_detected" ); } if ( yymore_used ) { if ( ! C_plus_plus ) { if ( yytext_is_array ) { indent_puts( "static int yy_more_offset = 0;" ); indent_puts( "static int yy_prev_more_offset = 0;" ); } else { indent_puts( "static int yy_more_flag = 0;" ); indent_puts( "static int yy_more_len = 0;" ); } } if ( yytext_is_array ) { indent_puts( "#define yymore() (yy_more_offset = yy_flex_strlen( yytext ))" ); indent_puts( "#define YY_NEED_STRLEN" ); indent_puts( "#define YY_MORE_ADJ 0" ); indent_puts( "#define YY_RESTORE_YY_MORE_OFFSET \\" ); indent_up(); indent_puts( "{ \\" ); indent_puts( "yy_more_offset = yy_prev_more_offset; \\" ); indent_puts( "yyleng -= yy_more_offset; \\" ); indent_puts( "}" ); indent_down(); } else { indent_puts( "#define yymore() (yy_more_flag = 1)" ); indent_puts( "#define YY_MORE_ADJ yy_more_len" ); indent_puts( "#define YY_RESTORE_YY_MORE_OFFSET" ); } } else { indent_puts( "#define yymore() yymore_used_but_not_detected" ); indent_puts( "#define YY_MORE_ADJ 0" ); indent_puts( "#define YY_RESTORE_YY_MORE_OFFSET" ); } if ( ! C_plus_plus ) { if ( yytext_is_array ) { outn( "#ifndef YYLMAX" ); outn( "#define YYLMAX 8192" ); outn( "#endif\n" ); outn( "char yytext[YYLMAX];" ); outn( "char *yytext_ptr;" ); } else outn( "char *yytext;" ); } out( &action_array[defs1_offset] ); line_directive_out( stdout, 0 ); skelout(); if ( ! C_plus_plus ) { if ( use_read ) { outn( "\tif ( (result = read( fileno(yyin), (char *) buf, max_size )) < 0 ) \\" ); outn( "\t\tYY_FATAL_ERROR( \"input in flex scanner failed\" );" ); } else { outn( "\tif ( yy_current_buffer->yy_is_interactive ) \\" ); outn( "\t\t{ \\" ); outn( "\t\tint c = '*', n; \\" ); outn( "\t\tfor ( n = 0; n < max_size && \\" ); outn( "\t\t\t (c = getc( yyin )) != EOF && c != '\\n'; ++n ) \\" ); outn( "\t\t\tbuf[n] = (char) c; \\" ); outn( "\t\tif ( c == '\\n' ) \\" ); outn( "\t\t\tbuf[n++] = (char) c; \\" ); outn( "\t\tif ( c == EOF && ferror( yyin ) ) \\" ); outn( "\t\t\tYY_FATAL_ERROR( \"input in flex scanner failed\" ); \\" ); outn( "\t\tresult = n; \\" ); outn( "\t\t} \\" ); outn( "\telse if ( ((result = fread( buf, 1, max_size, yyin )) == 0) \\" ); outn( "\t\t && ferror( yyin ) ) \\" ); outn( "\t\tYY_FATAL_ERROR( \"input in flex scanner failed\" );" ); } } skelout(); indent_puts( "#define YY_RULE_SETUP \\" ); indent_up(); if ( bol_needed ) { indent_puts( "if ( yyleng > 0 ) \\" ); indent_up(); indent_puts( "yy_current_buffer->yy_at_bol = \\" ); indent_puts( "\t\t(yytext[yyleng - 1] == '\\n'); \\" ); indent_down(); } indent_puts( "YY_USER_ACTION" ); indent_down(); skelout(); /* Copy prolog to output file. */ out( &action_array[prolog_offset] ); line_directive_out( stdout, 0 ); skelout(); set_indent( 2 ); if ( yymore_used && ! yytext_is_array ) { indent_puts( "yy_more_len = 0;" ); indent_puts( "if ( yy_more_flag )" ); indent_up(); indent_puts( "{" ); indent_puts( "yy_more_len = yy_c_buf_p - yytext_ptr;" ); indent_puts( "yy_more_flag = 0;" ); indent_puts( "}" ); indent_down(); } skelout(); gen_start_state(); /* Note, don't use any indentation. */ outn( "yy_match:" ); gen_next_match(); skelout(); set_indent( 2 ); gen_find_action(); skelout(); if ( do_yylineno ) { indent_puts( "if ( yy_act != YY_END_OF_BUFFER )" ); indent_up(); indent_puts( "{" ); indent_puts( "int yyl;" ); indent_puts( "for ( yyl = 0; yyl < yyleng; ++yyl )" ); indent_up(); indent_puts( "if ( yytext[yyl] == '\\n' )" ); indent_up(); indent_puts( "++yylineno;" ); indent_down(); indent_down(); indent_puts( "}" ); indent_down(); } skelout(); if ( ddebug ) { indent_puts( "if ( yy_flex_debug )" ); indent_up(); indent_puts( "{" ); indent_puts( "if ( yy_act == 0 )" ); indent_up(); indent_puts( C_plus_plus ? "cerr << \"--scanner backing up\\n\";" : "fprintf( stderr, \"--scanner backing up\\n\" );" ); indent_down(); do_indent(); out_dec( "else if ( yy_act < %d )\n", num_rules ); indent_up(); if ( C_plus_plus ) { indent_puts( "cerr << \"--accepting rule at line \" << yy_rule_linenum[yy_act] <<" ); indent_puts( " \"(\\\"\" << yytext << \"\\\")\\n\";" ); } else { indent_puts( "fprintf( stderr, \"--accepting rule at line %d (\\\"%s\\\")\\n\"," ); indent_puts( " yy_rule_linenum[yy_act], yytext );" ); } indent_down(); do_indent(); out_dec( "else if ( yy_act == %d )\n", num_rules ); indent_up(); if ( C_plus_plus ) { indent_puts( "cerr << \"--accepting default rule (\\\"\" << yytext << \"\\\")\\n\";" ); } else { indent_puts( "fprintf( stderr, \"--accepting default rule (\\\"%s\\\")\\n\"," ); indent_puts( " yytext );" ); } indent_down(); do_indent(); out_dec( "else if ( yy_act == %d )\n", num_rules + 1 ); indent_up(); indent_puts( C_plus_plus ? "cerr << \"--(end of buffer or a NUL)\\n\";" : "fprintf( stderr, \"--(end of buffer or a NUL)\\n\" );" ); indent_down(); do_indent(); outn( "else" ); indent_up(); if ( C_plus_plus ) { indent_puts( "cerr << \"--EOF (start condition \" << YY_START << \")\\n\";" ); } else { indent_puts( "fprintf( stderr, \"--EOF (start condition %d)\\n\", YY_START );" ); } indent_down(); indent_puts( "}" ); indent_down(); } /* Copy actions to output file. */ skelout(); indent_up(); gen_bu_action(); out( &action_array[action_offset] ); line_directive_out( stdout, 0 ); /* generate cases for any missing EOF rules */ for ( i = 1; i <= lastsc; ++i ) if ( ! sceof[i] ) { do_indent(); out_str( "case YY_STATE_EOF(%s):\n", scname[i] ); did_eof_rule = true; } if ( did_eof_rule ) { indent_up(); indent_puts( "yyterminate();" ); indent_down(); } /* Generate code for handling NUL's, if needed. */ /* First, deal with backing up and setting up yy_cp if the scanner * finds that it should JAM on the NUL. */ skelout(); set_indent( 4 ); if ( fullspd || fulltbl ) indent_puts( "yy_cp = yy_c_buf_p;" ); else { /* compressed table */ if ( ! reject && ! interactive ) { /* Do the guaranteed-needed backing up to figure * out the match. */ indent_puts( "yy_cp = yy_last_accepting_cpos;" ); indent_puts( "yy_current_state = yy_last_accepting_state;" ); } else /* Still need to initialize yy_cp, though * yy_current_state was set up by * yy_get_previous_state(). */ indent_puts( "yy_cp = yy_c_buf_p;" ); } /* Generate code for yy_get_previous_state(). */ set_indent( 1 ); skelout(); gen_start_state(); set_indent( 2 ); skelout(); gen_next_state( true ); set_indent( 1 ); skelout(); gen_NUL_trans(); skelout(); if ( do_yylineno ) { /* update yylineno inside of unput() */ indent_puts( "if ( c == '\\n' )" ); indent_up(); indent_puts( "--yylineno;" ); indent_down(); } skelout(); /* Update BOL and yylineno inside of input(). */ if ( bol_needed ) { indent_puts( "yy_current_buffer->yy_at_bol = (c == '\\n');" ); if ( do_yylineno ) { indent_puts( "if ( yy_current_buffer->yy_at_bol )" ); indent_up(); indent_puts( "++yylineno;" ); indent_down(); } } else if ( do_yylineno ) { indent_puts( "if ( c == '\\n' )" ); indent_up(); indent_puts( "++yylineno;" ); indent_down(); } skelout(); /* Copy remainder of input to output. */ line_directive_out( stdout, 1 ); if ( sectnum == 3 ) (void) flexscan(); /* copy remainder of input to output */ }