98e903e7a0
bison, keeping full compatibility with our previous yacc implementation. Also bring the ability to create reentrant parser This fix bin/140309 [1] PR: bin/140309 [1] Submitted by: Philippe Pepiot <ksh@philpep.org> [1] Approved by: des (mentor) MFC after: 1 month
665 lines
12 KiB
C
665 lines
12 KiB
C
/* $Id: main.c,v 1.38 2012/01/14 01:01:15 tom Exp $ */
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#include <signal.h>
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#include <unistd.h> /* for _exit() */
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#include "defs.h"
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#if defined(HAVE_ATEXIT)
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# ifdef HAVE_MKSTEMP
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# define USE_MKSTEMP 1
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# elif defined(HAVE_FCNTL_H)
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# define USE_MKSTEMP 1
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# include <fcntl.h> /* for open(), O_EXCL, etc. */
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# else
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# define USE_MKSTEMP 0
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# endif
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#else
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# define USE_MKSTEMP 0
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#endif
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#if USE_MKSTEMP
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#include <sys/types.h>
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#include <sys/stat.h>
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typedef struct _my_tmpfiles
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{
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struct _my_tmpfiles *next;
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char *name;
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}
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MY_TMPFILES;
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static MY_TMPFILES *my_tmpfiles;
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#endif /* USE_MKSTEMP */
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char dflag;
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char gflag;
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char iflag;
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char lflag;
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static char oflag;
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char rflag;
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char sflag;
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char tflag;
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char vflag;
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const char *symbol_prefix;
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const char *myname = "yacc";
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int lineno;
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int outline;
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static char empty_string[] = "";
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static char default_file_prefix[] = "y";
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static char *file_prefix = default_file_prefix;
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char *code_file_name;
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char *input_file_name = empty_string;
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char *defines_file_name;
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char *externs_file_name;
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static char *graph_file_name;
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static char *output_file_name;
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static char *verbose_file_name;
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FILE *action_file; /* a temp file, used to save actions associated */
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/* with rules until the parser is written */
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FILE *code_file; /* y.code.c (used when the -r option is specified) */
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FILE *defines_file; /* y.tab.h */
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FILE *externs_file; /* y.tab.i */
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FILE *input_file; /* the input file */
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FILE *output_file; /* y.tab.c */
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FILE *text_file; /* a temp file, used to save text until all */
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/* symbols have been defined */
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FILE *union_file; /* a temp file, used to save the union */
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/* definition until all symbol have been */
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/* defined */
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FILE *verbose_file; /* y.output */
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FILE *graph_file; /* y.dot */
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int nitems;
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int nrules;
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int nsyms;
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int ntokens;
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int nvars;
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Value_t start_symbol;
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char **symbol_name;
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char **symbol_pname;
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Value_t *symbol_value;
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short *symbol_prec;
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char *symbol_assoc;
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int pure_parser;
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int exit_code;
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Value_t *ritem;
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Value_t *rlhs;
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Value_t *rrhs;
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Value_t *rprec;
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Assoc_t *rassoc;
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Value_t **derives;
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char *nullable;
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/*
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* Since fclose() is called via the signal handler, it might die. Don't loop
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* if there is a problem closing a file.
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*/
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#define DO_CLOSE(fp) \
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if (fp != 0) { \
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FILE *use = fp; \
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fp = 0; \
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fclose(use); \
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}
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static int got_intr = 0;
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void
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done(int k)
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{
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DO_CLOSE(input_file);
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DO_CLOSE(output_file);
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DO_CLOSE(action_file);
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DO_CLOSE(defines_file);
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DO_CLOSE(graph_file);
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DO_CLOSE(text_file);
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DO_CLOSE(union_file);
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DO_CLOSE(verbose_file);
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if (got_intr)
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_exit(EXIT_FAILURE);
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#ifdef NO_LEAKS
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if (rflag)
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DO_FREE(code_file_name);
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if (dflag)
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DO_FREE(defines_file_name);
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if (iflag)
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DO_FREE(externs_file_name);
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if (oflag)
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DO_FREE(output_file_name);
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if (vflag)
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DO_FREE(verbose_file_name);
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if (gflag)
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DO_FREE(graph_file_name);
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lr0_leaks();
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lalr_leaks();
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mkpar_leaks();
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output_leaks();
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reader_leaks();
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#endif
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if (rflag)
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DO_CLOSE(code_file);
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exit(k);
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}
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static void
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onintr(__unused int sig)
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{
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got_intr = 1;
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done(EXIT_FAILURE);
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}
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static void
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set_signals(void)
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{
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#ifdef SIGINT
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if (signal(SIGINT, SIG_IGN) != SIG_IGN)
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signal(SIGINT, onintr);
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#endif
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#ifdef SIGTERM
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if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
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signal(SIGTERM, onintr);
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#endif
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#ifdef SIGHUP
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if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
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signal(SIGHUP, onintr);
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#endif
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}
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static void
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usage(void)
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{
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static const char *msg[] =
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{
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""
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,"Options:"
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," -b file_prefix set filename prefix (default \"y.\")"
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," -d write definitions (y.tab.h)"
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," -i write interface (y.tab.i)"
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," -g write a graphical description"
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," -l suppress #line directives"
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," -o output_file (default \"y.tab.c\")"
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," -p symbol_prefix set symbol prefix (default \"yy\")"
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," -P create a reentrant parser, e.g., \"%pure-parser\""
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," -r produce separate code and table files (y.code.c)"
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," -s suppress #define's for quoted names in %token lines"
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," -t add debugging support"
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," -v write description (y.output)"
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," -V show version information and exit"
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};
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unsigned n;
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fflush(stdout);
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fprintf(stderr, "Usage: %s [options] filename\n", myname);
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for (n = 0; n < sizeof(msg) / sizeof(msg[0]); ++n)
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fprintf(stderr, "%s\n", msg[n]);
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exit(1);
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}
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static void
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setflag(int ch)
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{
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switch (ch)
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{
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case 'd':
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dflag = 1;
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break;
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case 'g':
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gflag = 1;
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break;
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case 'i':
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iflag = 1;
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break;
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case 'l':
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lflag = 1;
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break;
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case 'P':
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pure_parser = 1;
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break;
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case 'r':
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rflag = 1;
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break;
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case 's':
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sflag = 1;
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break;
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case 't':
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tflag = 1;
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break;
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case 'v':
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vflag = 1;
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break;
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case 'V':
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printf("%s - %s\n", myname, VERSION);
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exit(EXIT_SUCCESS);
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case 'y':
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/* noop for bison compatibility. byacc is already designed to be posix
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* yacc compatible. */
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break;
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default:
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usage();
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}
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}
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static void
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getargs(int argc, char *argv[])
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{
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int i;
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char *s;
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int ch;
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if (argc > 0)
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myname = argv[0];
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for (i = 1; i < argc; ++i)
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{
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s = argv[i];
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if (*s != '-')
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break;
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switch (ch = *++s)
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{
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case '\0':
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input_file = stdin;
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if (i + 1 < argc)
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usage();
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return;
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case '-':
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++i;
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goto no_more_options;
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case 'b':
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if (*++s)
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file_prefix = s;
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else if (++i < argc)
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file_prefix = argv[i];
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else
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usage();
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continue;
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case 'o':
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if (*++s)
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output_file_name = s;
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else if (++i < argc)
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output_file_name = argv[i];
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else
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usage();
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continue;
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case 'p':
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if (*++s)
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symbol_prefix = s;
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else if (++i < argc)
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symbol_prefix = argv[i];
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else
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usage();
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continue;
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default:
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setflag(ch);
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break;
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}
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for (;;)
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{
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switch (ch = *++s)
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{
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case '\0':
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goto end_of_option;
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default:
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setflag(ch);
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break;
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}
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}
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end_of_option:;
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}
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no_more_options:;
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if (i + 1 != argc)
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usage();
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input_file_name = argv[i];
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}
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void *
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allocate(size_t n)
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{
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void *p;
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p = NULL;
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if (n)
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{
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p = CALLOC(1, n);
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NO_SPACE(p);
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}
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return (p);
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}
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#define CREATE_FILE_NAME(dest, suffix) \
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dest = MALLOC(len + strlen(suffix) + 1); \
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NO_SPACE(dest); \
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strcpy(dest, file_prefix); \
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strcpy(dest + len, suffix)
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static void
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create_file_names(void)
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{
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size_t len;
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const char *defines_suffix;
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const char *externs_suffix;
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char *prefix;
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prefix = NULL;
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defines_suffix = DEFINES_SUFFIX;
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externs_suffix = EXTERNS_SUFFIX;
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/* compute the file_prefix from the user provided output_file_name */
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if (output_file_name != 0)
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{
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if (!(prefix = strstr(output_file_name, ".tab.c"))
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&& (prefix = strstr(output_file_name, ".c")))
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{
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defines_suffix = ".h";
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externs_suffix = ".i";
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}
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}
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if (prefix != NULL)
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{
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len = (size_t) (prefix - output_file_name);
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file_prefix = (char *)MALLOC(len + 1);
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NO_SPACE(file_prefix);
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strncpy(file_prefix, output_file_name, len)[len] = 0;
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}
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else
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len = strlen(file_prefix);
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/* if "-o filename" was not given */
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if (output_file_name == 0)
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{
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oflag = 1;
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CREATE_FILE_NAME(output_file_name, OUTPUT_SUFFIX);
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}
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if (rflag)
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{
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CREATE_FILE_NAME(code_file_name, CODE_SUFFIX);
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}
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else
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code_file_name = output_file_name;
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if (dflag)
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{
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CREATE_FILE_NAME(defines_file_name, defines_suffix);
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}
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if (iflag)
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{
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CREATE_FILE_NAME(externs_file_name, externs_suffix);
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}
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if (vflag)
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{
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CREATE_FILE_NAME(verbose_file_name, VERBOSE_SUFFIX);
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}
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if (gflag)
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{
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CREATE_FILE_NAME(graph_file_name, GRAPH_SUFFIX);
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}
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if (prefix != NULL)
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{
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FREE(file_prefix);
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}
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}
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#if USE_MKSTEMP
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static void
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close_tmpfiles(void)
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{
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while (my_tmpfiles != 0)
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{
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MY_TMPFILES *next = my_tmpfiles->next;
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chmod(my_tmpfiles->name, 0644);
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unlink(my_tmpfiles->name);
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free(my_tmpfiles->name);
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free(my_tmpfiles);
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my_tmpfiles = next;
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}
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}
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#ifndef HAVE_MKSTEMP
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static int
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my_mkstemp(char *temp)
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{
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int fd;
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char *dname;
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char *fname;
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char *name;
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/*
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* Split-up to use tempnam, rather than tmpnam; the latter (like
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* mkstemp) is unusable on Windows.
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*/
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if ((fname = strrchr(temp, '/')) != 0)
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{
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dname = strdup(temp);
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dname[++fname - temp] = '\0';
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}
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else
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{
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dname = 0;
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fname = temp;
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}
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if ((name = tempnam(dname, fname)) != 0)
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{
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fd = open(name, O_CREAT | O_EXCL | O_RDWR);
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strcpy(temp, name);
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}
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else
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{
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fd = -1;
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}
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if (dname != 0)
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free(dname);
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return fd;
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}
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#define mkstemp(s) my_mkstemp(s)
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#endif
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#endif
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/*
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* tmpfile() should be adequate, except that it may require special privileges
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* to use, e.g., MinGW and Windows 7 where it tries to use the root directory.
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*/
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static FILE *
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open_tmpfile(const char *label)
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{
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FILE *result;
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#if USE_MKSTEMP
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int fd;
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const char *tmpdir;
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char *name;
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const char *mark;
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if ((tmpdir = getenv("TMPDIR")) == 0 || access(tmpdir, W_OK) != 0)
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{
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#ifdef P_tmpdir
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tmpdir = P_tmpdir;
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#else
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tmpdir = "/tmp";
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#endif
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if (access(tmpdir, W_OK) != 0)
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tmpdir = ".";
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}
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name = malloc(strlen(tmpdir) + 10 + strlen(label));
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result = 0;
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if (name != 0)
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{
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if ((mark = strrchr(label, '_')) == 0)
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mark = label + strlen(label);
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sprintf(name, "%s/%.*sXXXXXX", tmpdir, (int)(mark - label), label);
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fd = mkstemp(name);
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if (fd >= 0)
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{
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result = fdopen(fd, "w+");
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if (result != 0)
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{
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MY_TMPFILES *item;
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if (my_tmpfiles == 0)
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{
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atexit(close_tmpfiles);
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}
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item = NEW(MY_TMPFILES);
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NO_SPACE(item);
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item->name = name;
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NO_SPACE(item->name);
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item->next = my_tmpfiles;
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my_tmpfiles = item;
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}
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}
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}
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#else
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result = tmpfile();
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#endif
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if (result == 0)
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open_error(label);
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return result;
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}
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static void
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open_files(void)
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{
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create_file_names();
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if (input_file == 0)
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{
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input_file = fopen(input_file_name, "r");
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if (input_file == 0)
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open_error(input_file_name);
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}
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action_file = open_tmpfile("action_file");
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text_file = open_tmpfile("text_file");
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if (vflag)
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{
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verbose_file = fopen(verbose_file_name, "w");
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if (verbose_file == 0)
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open_error(verbose_file_name);
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}
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if (gflag)
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{
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graph_file = fopen(graph_file_name, "w");
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if (graph_file == 0)
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open_error(graph_file_name);
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fprintf(graph_file, "digraph %s {\n", file_prefix);
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fprintf(graph_file, "\tedge [fontsize=10];\n");
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fprintf(graph_file, "\tnode [shape=box,fontsize=10];\n");
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fprintf(graph_file, "\torientation=landscape;\n");
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fprintf(graph_file, "\trankdir=LR;\n");
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fprintf(graph_file, "\t/*\n");
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fprintf(graph_file, "\tmargin=0.2;\n");
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fprintf(graph_file, "\tpage=\"8.27,11.69\"; // for A4 printing\n");
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fprintf(graph_file, "\tratio=auto;\n");
|
|
fprintf(graph_file, "\t*/\n");
|
|
}
|
|
|
|
if (dflag)
|
|
{
|
|
defines_file = fopen(defines_file_name, "w");
|
|
if (defines_file == 0)
|
|
open_error(defines_file_name);
|
|
union_file = open_tmpfile("union_file");
|
|
}
|
|
|
|
if (iflag)
|
|
{
|
|
externs_file = fopen(externs_file_name, "w");
|
|
if (externs_file == 0)
|
|
open_error(externs_file_name);
|
|
}
|
|
|
|
output_file = fopen(output_file_name, "w");
|
|
if (output_file == 0)
|
|
open_error(output_file_name);
|
|
|
|
if (rflag)
|
|
{
|
|
code_file = fopen(code_file_name, "w");
|
|
if (code_file == 0)
|
|
open_error(code_file_name);
|
|
}
|
|
else
|
|
code_file = output_file;
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
SRexpect = -1;
|
|
RRexpect = -1;
|
|
exit_code = EXIT_SUCCESS;
|
|
|
|
set_signals();
|
|
getargs(argc, argv);
|
|
open_files();
|
|
reader();
|
|
lr0();
|
|
lalr();
|
|
make_parser();
|
|
graph();
|
|
finalize_closure();
|
|
verbose();
|
|
output();
|
|
done(exit_code);
|
|
/*NOTREACHED */
|
|
}
|