769 lines
19 KiB
C
769 lines
19 KiB
C
/* flex - tool to generate fast lexical analyzers */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Vern Paxson.
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*
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* The United States Government has rights in this work pursuant
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* to contract no. DE-AC03-76SF00098 between the United States
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* Department of Energy and the University of California.
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*
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* Redistribution and use in source and binary forms are permitted provided
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* that: (1) source distributions retain this entire copyright notice and
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* comment, and (2) distributions including binaries display the following
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* acknowledgement: ``This product includes software developed by the
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* University of California, Berkeley and its contributors'' in the
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* documentation or other materials provided with the distribution and in
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* all advertising materials mentioning features or use of this software.
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* Neither the name of the University nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char rcsid[] =
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"@(#) $Id$ (LBL)";
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#endif
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#include "flexdef.h"
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static char flex_version[] = "2.3";
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/* declare functions that have forward references */
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void flexinit PROTO((int, char**));
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void readin PROTO(());
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void set_up_initial_allocations PROTO(());
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/* these globals are all defined and commented in flexdef.h */
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int printstats, syntaxerror, eofseen, ddebug, trace, spprdflt;
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int interactive, caseins, useecs, fulltbl, usemecs;
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int fullspd, gen_line_dirs, performance_report, backtrack_report, csize;
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int yymore_used, reject, real_reject, continued_action;
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int yymore_really_used, reject_really_used;
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int datapos, dataline, linenum;
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FILE *skelfile = NULL;
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char *infilename = NULL;
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int onestate[ONE_STACK_SIZE], onesym[ONE_STACK_SIZE];
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int onenext[ONE_STACK_SIZE], onedef[ONE_STACK_SIZE], onesp;
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int current_mns, num_rules, current_max_rules, lastnfa;
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int *firstst, *lastst, *finalst, *transchar, *trans1, *trans2;
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int *accptnum, *assoc_rule, *state_type, *rule_type, *rule_linenum;
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int current_state_type;
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int variable_trailing_context_rules;
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int numtemps, numprots, protprev[MSP], protnext[MSP], prottbl[MSP];
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int protcomst[MSP], firstprot, lastprot, protsave[PROT_SAVE_SIZE];
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int numecs, nextecm[CSIZE + 1], ecgroup[CSIZE + 1], nummecs, tecfwd[CSIZE + 1];
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int tecbck[CSIZE + 1];
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int *xlation = (int *) 0;
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int num_xlations;
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int lastsc, current_max_scs, *scset, *scbol, *scxclu, *sceof, *actvsc;
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char **scname;
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int current_max_dfa_size, current_max_xpairs;
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int current_max_template_xpairs, current_max_dfas;
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int lastdfa, *nxt, *chk, *tnxt;
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int *base, *def, *nultrans, NUL_ec, tblend, firstfree, **dss, *dfasiz;
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union dfaacc_union *dfaacc;
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int *accsiz, *dhash, numas;
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int numsnpairs, jambase, jamstate;
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int lastccl, current_maxccls, *cclmap, *ccllen, *cclng, cclreuse;
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int current_max_ccl_tbl_size;
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Char *ccltbl;
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char *starttime, *endtime, nmstr[MAXLINE];
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int sectnum, nummt, hshcol, dfaeql, numeps, eps2, num_reallocs;
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int tmpuses, totnst, peakpairs, numuniq, numdup, hshsave;
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int num_backtracking, bol_needed;
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FILE *temp_action_file;
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FILE *backtrack_file;
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int end_of_buffer_state;
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char *action_file_name = NULL;
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char **input_files;
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int num_input_files;
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char *program_name;
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#ifndef SHORT_FILE_NAMES
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static char *outfile = "lex.yy.c";
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#else
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static char *outfile = "lexyy.c";
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#endif
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static int outfile_created = 0;
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static int use_stdout;
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static char *skelname = NULL;
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int main( argc, argv )
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int argc;
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char **argv;
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{
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flexinit( argc, argv );
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readin();
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if ( syntaxerror )
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flexend( 1 );
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if ( yymore_really_used == REALLY_USED )
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yymore_used = true;
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else if ( yymore_really_used == REALLY_NOT_USED )
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yymore_used = false;
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if ( reject_really_used == REALLY_USED )
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reject = true;
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else if ( reject_really_used == REALLY_NOT_USED )
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reject = false;
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if ( performance_report )
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{
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if ( interactive )
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fprintf( stderr,
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"-I (interactive) entails a minor performance penalty\n" );
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if ( yymore_used )
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fprintf( stderr, "yymore() entails a minor performance penalty\n" );
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if ( reject )
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fprintf( stderr, "REJECT entails a large performance penalty\n" );
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if ( variable_trailing_context_rules )
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fprintf( stderr,
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"Variable trailing context rules entail a large performance penalty\n" );
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}
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if ( reject )
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real_reject = true;
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if ( variable_trailing_context_rules )
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reject = true;
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if ( (fulltbl || fullspd) && reject )
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{
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if ( real_reject )
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flexerror( "REJECT cannot be used with -f or -F" );
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else
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flexerror(
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"variable trailing context rules cannot be used with -f or -F" );
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}
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ntod();
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/* generate the C state transition tables from the DFA */
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make_tables();
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/* note, flexend does not return. It exits with its argument as status. */
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flexend( 0 );
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/*NOTREACHED*/
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}
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/* flexend - terminate flex
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*
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* synopsis
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* int status;
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* flexend( status );
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*
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* status is exit status.
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*
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* note
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* This routine does not return.
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*/
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void flexend( status )
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int status;
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{
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int tblsiz;
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char *flex_gettime();
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if ( skelfile != NULL )
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{
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if ( ferror( skelfile ) )
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flexfatal( "error occurred when writing skeleton file" );
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else if ( fclose( skelfile ) )
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flexfatal( "error occurred when closing skeleton file" );
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}
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if ( temp_action_file )
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{
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if ( ferror( temp_action_file ) )
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flexfatal( "error occurred when writing temporary action file" );
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else if ( fclose( temp_action_file ) )
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flexfatal( "error occurred when closing temporary action file" );
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else if ( unlink( action_file_name ) )
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flexfatal( "error occurred when deleting temporary action file" );
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}
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if ( status != 0 && outfile_created )
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{
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if ( ferror( stdout ) )
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flexfatal( "error occurred when writing output file" );
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else if ( fclose( stdout ) )
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flexfatal( "error occurred when closing output file" );
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else if ( unlink( outfile ) )
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flexfatal( "error occurred when deleting output file" );
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}
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if ( backtrack_report && backtrack_file )
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{
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if ( num_backtracking == 0 )
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fprintf( backtrack_file, "No backtracking.\n" );
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else if ( fullspd || fulltbl )
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fprintf( backtrack_file,
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"%d backtracking (non-accepting) states.\n",
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num_backtracking );
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else
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fprintf( backtrack_file, "Compressed tables always backtrack.\n" );
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if ( ferror( backtrack_file ) )
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flexfatal( "error occurred when writing backtracking file" );
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else if ( fclose( backtrack_file ) )
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flexfatal( "error occurred when closing backtracking file" );
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}
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if ( printstats )
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{
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endtime = flex_gettime();
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fprintf( stderr, "%s version %s usage statistics:\n", program_name,
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flex_version );
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fprintf( stderr, " started at %s, finished at %s\n",
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starttime, endtime );
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fprintf( stderr, " scanner options: -" );
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if ( backtrack_report )
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putc( 'b', stderr );
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if ( ddebug )
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putc( 'd', stderr );
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if ( interactive )
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putc( 'I', stderr );
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if ( caseins )
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putc( 'i', stderr );
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if ( ! gen_line_dirs )
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putc( 'L', stderr );
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if ( performance_report )
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putc( 'p', stderr );
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if ( spprdflt )
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putc( 's', stderr );
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if ( use_stdout )
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putc( 't', stderr );
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if ( trace )
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putc( 'T', stderr );
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if ( printstats )
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putc( 'v', stderr ); /* always true! */
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if ( csize == 256 )
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putc( '8', stderr );
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fprintf( stderr, " -C" );
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if ( fulltbl )
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putc( 'f', stderr );
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if ( fullspd )
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putc( 'F', stderr );
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if ( useecs )
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putc( 'e', stderr );
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if ( usemecs )
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putc( 'm', stderr );
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if ( strcmp( skelname, DEFAULT_SKELETON_FILE ) )
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fprintf( stderr, " -S%s", skelname );
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putc( '\n', stderr );
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fprintf( stderr, " %d/%d NFA states\n", lastnfa, current_mns );
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fprintf( stderr, " %d/%d DFA states (%d words)\n", lastdfa,
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current_max_dfas, totnst );
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fprintf( stderr,
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" %d rules\n", num_rules - 1 /* - 1 for def. rule */ );
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if ( num_backtracking == 0 )
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fprintf( stderr, " No backtracking\n" );
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else if ( fullspd || fulltbl )
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fprintf( stderr, " %d backtracking (non-accepting) states\n",
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num_backtracking );
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else
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fprintf( stderr, " compressed tables always backtrack\n" );
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if ( bol_needed )
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fprintf( stderr, " Beginning-of-line patterns used\n" );
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fprintf( stderr, " %d/%d start conditions\n", lastsc,
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current_max_scs );
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fprintf( stderr, " %d epsilon states, %d double epsilon states\n",
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numeps, eps2 );
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if ( lastccl == 0 )
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fprintf( stderr, " no character classes\n" );
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else
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fprintf( stderr,
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" %d/%d character classes needed %d/%d words of storage, %d reused\n",
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lastccl, current_maxccls,
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cclmap[lastccl] + ccllen[lastccl],
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current_max_ccl_tbl_size, cclreuse );
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fprintf( stderr, " %d state/nextstate pairs created\n", numsnpairs );
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fprintf( stderr, " %d/%d unique/duplicate transitions\n",
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numuniq, numdup );
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if ( fulltbl )
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{
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tblsiz = lastdfa * numecs;
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fprintf( stderr, " %d table entries\n", tblsiz );
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}
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else
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{
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tblsiz = 2 * (lastdfa + numtemps) + 2 * tblend;
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fprintf( stderr, " %d/%d base-def entries created\n",
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lastdfa + numtemps, current_max_dfas );
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fprintf( stderr, " %d/%d (peak %d) nxt-chk entries created\n",
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tblend, current_max_xpairs, peakpairs );
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fprintf( stderr,
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" %d/%d (peak %d) template nxt-chk entries created\n",
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numtemps * nummecs, current_max_template_xpairs,
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numtemps * numecs );
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fprintf( stderr, " %d empty table entries\n", nummt );
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fprintf( stderr, " %d protos created\n", numprots );
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fprintf( stderr, " %d templates created, %d uses\n",
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numtemps, tmpuses );
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}
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if ( useecs )
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{
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tblsiz = tblsiz + csize;
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fprintf( stderr, " %d/%d equivalence classes created\n",
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numecs, csize );
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}
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if ( usemecs )
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{
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tblsiz = tblsiz + numecs;
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fprintf( stderr, " %d/%d meta-equivalence classes created\n",
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nummecs, csize );
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}
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fprintf( stderr, " %d (%d saved) hash collisions, %d DFAs equal\n",
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hshcol, hshsave, dfaeql );
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fprintf( stderr, " %d sets of reallocations needed\n", num_reallocs );
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fprintf( stderr, " %d total table entries needed\n", tblsiz );
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}
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#ifndef VMS
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exit( status );
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#else
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exit( status + 1 );
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#endif
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}
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/* flexinit - initialize flex
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*
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* synopsis
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* int argc;
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* char **argv;
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* flexinit( argc, argv );
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*/
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void flexinit( argc, argv )
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int argc;
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char **argv;
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{
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int i, sawcmpflag;
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char *arg, *flex_gettime(), *mktemp();
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printstats = syntaxerror = trace = spprdflt = interactive = caseins = false;
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backtrack_report = performance_report = ddebug = fulltbl = fullspd = false;
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yymore_used = continued_action = reject = false;
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yymore_really_used = reject_really_used = false;
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gen_line_dirs = usemecs = useecs = true;
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sawcmpflag = false;
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use_stdout = false;
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csize = DEFAULT_CSIZE;
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program_name = argv[0];
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/* read flags */
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for ( --argc, ++argv; argc ; --argc, ++argv )
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{
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if ( argv[0][0] != '-' || argv[0][1] == '\0' )
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break;
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arg = argv[0];
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for ( i = 1; arg[i] != '\0'; ++i )
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switch ( arg[i] )
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{
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case 'b':
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backtrack_report = true;
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break;
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case 'c':
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fprintf( stderr,
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"%s: Assuming use of deprecated -c flag is really intended to be -C\n",
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program_name );
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|
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/* fall through */
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case 'C':
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if ( i != 1 )
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flexerror( "-C flag must be given separately" );
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if ( ! sawcmpflag )
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{
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useecs = false;
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usemecs = false;
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fulltbl = false;
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sawcmpflag = true;
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}
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for ( ++i; arg[i] != '\0'; ++i )
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switch ( arg[i] )
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{
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case 'e':
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useecs = true;
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break;
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case 'F':
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fullspd = true;
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break;
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case 'f':
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fulltbl = true;
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break;
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case 'm':
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usemecs = true;
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break;
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default:
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lerrif( "unknown -C option '%c'",
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(int) arg[i] );
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break;
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}
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goto get_next_arg;
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|
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case 'd':
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ddebug = true;
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break;
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case 'f':
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useecs = usemecs = false;
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fulltbl = true;
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break;
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case 'F':
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useecs = usemecs = false;
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fullspd = true;
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break;
|
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case 'I':
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interactive = true;
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break;
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case 'i':
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caseins = true;
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break;
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case 'L':
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gen_line_dirs = false;
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break;
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|
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case 'n':
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/* stupid do-nothing deprecated option */
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break;
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case 'p':
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performance_report = true;
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break;
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case 'S':
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if ( i != 1 )
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flexerror( "-S flag must be given separately" );
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skelname = arg + i + 1;
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goto get_next_arg;
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case 's':
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spprdflt = true;
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break;
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case 't':
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use_stdout = true;
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break;
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case 'T':
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trace = true;
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break;
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case 'v':
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printstats = true;
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break;
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|
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case '8':
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csize = CSIZE;
|
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break;
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|
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default:
|
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lerrif( "unknown flag '%c'", (int) arg[i] );
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break;
|
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}
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get_next_arg: /* used by -C and -S flags in lieu of a "continue 2" control */
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;
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}
|
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|
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if ( (fulltbl || fullspd) && usemecs )
|
|
flexerror( "full table and -Cm don't make sense together" );
|
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|
|
if ( (fulltbl || fullspd) && interactive )
|
|
flexerror( "full table and -I are (currently) incompatible" );
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|
|
|
if ( fulltbl && fullspd )
|
|
flexerror( "full table and -F are mutually exclusive" );
|
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|
|
if ( ! skelname )
|
|
{
|
|
static char skeleton_name_storage[400];
|
|
|
|
skelname = skeleton_name_storage;
|
|
(void) strcpy( skelname, DEFAULT_SKELETON_FILE );
|
|
}
|
|
|
|
if ( ! use_stdout )
|
|
{
|
|
FILE *prev_stdout = freopen( outfile, "w", stdout );
|
|
|
|
if ( prev_stdout == NULL )
|
|
lerrsf( "could not create %s", outfile );
|
|
|
|
outfile_created = 1;
|
|
}
|
|
|
|
num_input_files = argc;
|
|
input_files = argv;
|
|
set_input_file( num_input_files > 0 ? input_files[0] : NULL );
|
|
|
|
if ( backtrack_report )
|
|
{
|
|
#ifndef SHORT_FILE_NAMES
|
|
backtrack_file = fopen( "lex.backtrack", "w" );
|
|
#else
|
|
backtrack_file = fopen( "lex.bck", "w" );
|
|
#endif
|
|
|
|
if ( backtrack_file == NULL )
|
|
flexerror( "could not create lex.backtrack" );
|
|
}
|
|
|
|
else
|
|
backtrack_file = NULL;
|
|
|
|
|
|
lastccl = 0;
|
|
lastsc = 0;
|
|
|
|
/* initialize the statistics */
|
|
starttime = flex_gettime();
|
|
|
|
if ( (skelfile = fopen( skelname, "r" )) == NULL )
|
|
lerrsf( "can't open skeleton file %s", skelname );
|
|
|
|
#ifndef ACK_MOD
|
|
#ifdef SYS_V
|
|
action_file_name = tmpnam( NULL );
|
|
#endif
|
|
#endif
|
|
|
|
if ( action_file_name == NULL )
|
|
{
|
|
static char temp_action_file_name[32];
|
|
|
|
#ifndef SHORT_FILE_NAMES
|
|
(void) strcpy( temp_action_file_name, "/tmp/flexXXXXXX" );
|
|
#else
|
|
(void) strcpy( temp_action_file_name, "flexXXXXXX.tmp" );
|
|
#endif
|
|
(void) mktemp( temp_action_file_name );
|
|
|
|
action_file_name = temp_action_file_name;
|
|
}
|
|
|
|
if ( (temp_action_file = fopen( action_file_name, "w" )) == NULL )
|
|
lerrsf( "can't open temporary action file %s", action_file_name );
|
|
|
|
lastdfa = lastnfa = num_rules = numas = numsnpairs = tmpuses = 0;
|
|
numecs = numeps = eps2 = num_reallocs = hshcol = dfaeql = totnst = 0;
|
|
numuniq = numdup = hshsave = eofseen = datapos = dataline = 0;
|
|
num_backtracking = onesp = numprots = 0;
|
|
variable_trailing_context_rules = bol_needed = false;
|
|
|
|
linenum = sectnum = 1;
|
|
firstprot = NIL;
|
|
|
|
/* used in mkprot() so that the first proto goes in slot 1
|
|
* of the proto queue
|
|
*/
|
|
lastprot = 1;
|
|
|
|
if ( useecs )
|
|
{ /* set up doubly-linked equivalence classes */
|
|
/* We loop all the way up to csize, since ecgroup[csize] is the
|
|
* position used for NUL characters
|
|
*/
|
|
ecgroup[1] = NIL;
|
|
|
|
for ( i = 2; i <= csize; ++i )
|
|
{
|
|
ecgroup[i] = i - 1;
|
|
nextecm[i - 1] = i;
|
|
}
|
|
|
|
nextecm[csize] = NIL;
|
|
}
|
|
|
|
else
|
|
{ /* put everything in its own equivalence class */
|
|
for ( i = 1; i <= csize; ++i )
|
|
{
|
|
ecgroup[i] = i;
|
|
nextecm[i] = BAD_SUBSCRIPT; /* to catch errors */
|
|
}
|
|
}
|
|
|
|
set_up_initial_allocations();
|
|
}
|
|
|
|
|
|
/* readin - read in the rules section of the input file(s)
|
|
*
|
|
* synopsis
|
|
* readin();
|
|
*/
|
|
|
|
void readin()
|
|
|
|
{
|
|
skelout();
|
|
|
|
if ( ddebug )
|
|
puts( "#define FLEX_DEBUG" );
|
|
|
|
if ( csize == 256 )
|
|
puts( "#define YY_CHAR unsigned char" );
|
|
else
|
|
puts( "#define YY_CHAR char" );
|
|
|
|
line_directive_out( stdout );
|
|
|
|
if ( yyparse() )
|
|
{
|
|
pinpoint_message( "fatal parse error" );
|
|
flexend( 1 );
|
|
}
|
|
|
|
if ( xlation )
|
|
{
|
|
numecs = ecs_from_xlation( ecgroup );
|
|
useecs = true;
|
|
}
|
|
|
|
else if ( useecs )
|
|
numecs = cre8ecs( nextecm, ecgroup, csize );
|
|
|
|
else
|
|
numecs = csize;
|
|
|
|
/* now map the equivalence class for NUL to its expected place */
|
|
ecgroup[0] = ecgroup[csize];
|
|
NUL_ec = abs( ecgroup[0] );
|
|
|
|
if ( useecs )
|
|
ccl2ecl();
|
|
}
|
|
|
|
|
|
|
|
/* set_up_initial_allocations - allocate memory for internal tables */
|
|
|
|
void set_up_initial_allocations()
|
|
|
|
{
|
|
current_mns = INITIAL_MNS;
|
|
firstst = allocate_integer_array( current_mns );
|
|
lastst = allocate_integer_array( current_mns );
|
|
finalst = allocate_integer_array( current_mns );
|
|
transchar = allocate_integer_array( current_mns );
|
|
trans1 = allocate_integer_array( current_mns );
|
|
trans2 = allocate_integer_array( current_mns );
|
|
accptnum = allocate_integer_array( current_mns );
|
|
assoc_rule = allocate_integer_array( current_mns );
|
|
state_type = allocate_integer_array( current_mns );
|
|
|
|
current_max_rules = INITIAL_MAX_RULES;
|
|
rule_type = allocate_integer_array( current_max_rules );
|
|
rule_linenum = allocate_integer_array( current_max_rules );
|
|
|
|
current_max_scs = INITIAL_MAX_SCS;
|
|
scset = allocate_integer_array( current_max_scs );
|
|
scbol = allocate_integer_array( current_max_scs );
|
|
scxclu = allocate_integer_array( current_max_scs );
|
|
sceof = allocate_integer_array( current_max_scs );
|
|
scname = allocate_char_ptr_array( current_max_scs );
|
|
actvsc = allocate_integer_array( current_max_scs );
|
|
|
|
current_maxccls = INITIAL_MAX_CCLS;
|
|
cclmap = allocate_integer_array( current_maxccls );
|
|
ccllen = allocate_integer_array( current_maxccls );
|
|
cclng = allocate_integer_array( current_maxccls );
|
|
|
|
current_max_ccl_tbl_size = INITIAL_MAX_CCL_TBL_SIZE;
|
|
ccltbl = allocate_character_array( current_max_ccl_tbl_size );
|
|
|
|
current_max_dfa_size = INITIAL_MAX_DFA_SIZE;
|
|
|
|
current_max_xpairs = INITIAL_MAX_XPAIRS;
|
|
nxt = allocate_integer_array( current_max_xpairs );
|
|
chk = allocate_integer_array( current_max_xpairs );
|
|
|
|
current_max_template_xpairs = INITIAL_MAX_TEMPLATE_XPAIRS;
|
|
tnxt = allocate_integer_array( current_max_template_xpairs );
|
|
|
|
current_max_dfas = INITIAL_MAX_DFAS;
|
|
base = allocate_integer_array( current_max_dfas );
|
|
def = allocate_integer_array( current_max_dfas );
|
|
dfasiz = allocate_integer_array( current_max_dfas );
|
|
accsiz = allocate_integer_array( current_max_dfas );
|
|
dhash = allocate_integer_array( current_max_dfas );
|
|
dss = allocate_int_ptr_array( current_max_dfas );
|
|
dfaacc = allocate_dfaacc_union( current_max_dfas );
|
|
|
|
nultrans = (int *) 0;
|
|
}
|