/usr.bin/yacc/main.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 438 lines · 336 code · 61 blank · 41 comment · 99 complexity · ac53961b2f52d5dda8ce567d4c5f1df8 MD5 · raw file
- /*
- * Copyright (c) 1989 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Robert Paul Corbett.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #if 0
- #ifndef lint
- static char sccsid[] = "@(#)main.c 5.5 (Berkeley) 5/24/93";
- #endif
- #endif
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <paths.h>
- #include <signal.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include "defs.h"
- char dflag;
- char lflag;
- char rflag;
- char tflag;
- char vflag;
- const char *symbol_prefix;
- const char *file_prefix = "y";
- char temp_form[] = "yacc.XXXXXXXXXXX";
- int lineno;
- int outline;
- char *action_file_name;
- char *code_file_name;
- char *defines_file_name;
- const char *input_file_name = "";
- char *output_file_name;
- char *text_file_name;
- char *union_file_name;
- char *verbose_file_name;
- FILE *action_file; /* a temp file, used to save actions associated */
- /* with rules until the parser is written */
- FILE *code_file; /* y.code.c (used when the -r option is specified) */
- FILE *defines_file; /* y.tab.h */
- FILE *input_file; /* the input file */
- FILE *output_file; /* y.tab.c */
- FILE *text_file; /* a temp file, used to save text until all */
- /* symbols have been defined */
- FILE *union_file; /* a temp file, used to save the union */
- /* definition until all symbol have been */
- /* defined */
- FILE *verbose_file; /* y.output */
- int nitems;
- int nrules;
- int nsyms;
- int ntokens;
- int nvars;
- int start_symbol;
- char **symbol_name;
- short *symbol_value;
- short *symbol_prec;
- char *symbol_assoc;
- short *ritem;
- short *rlhs;
- short *rrhs;
- short *rprec;
- char *rassoc;
- short **derives;
- char *nullable;
- static void create_file_names(void);
- static void getargs(int, char **);
- static void onintr(int);
- static void open_files(void);
- static void set_signals(void);
- static void usage(void);
- volatile sig_atomic_t sigdie;
- __dead2 void
- done(int k)
- {
- if (action_file) { fclose(action_file); unlink(action_file_name); }
- if (text_file) { fclose(text_file); unlink(text_file_name); }
- if (union_file) { fclose(union_file); unlink(union_file_name); }
- if (sigdie) { _exit(k); }
- exit(k);
- }
- static void
- onintr(int signo __unused)
- {
- sigdie = 1;
- done(1);
- }
- static void
- set_signals(void)
- {
- #ifdef SIGINT
- if (signal(SIGINT, SIG_IGN) != SIG_IGN)
- signal(SIGINT, onintr);
- #endif
- #ifdef SIGTERM
- if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
- signal(SIGTERM, onintr);
- #endif
- #ifdef SIGHUP
- if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
- signal(SIGHUP, onintr);
- #endif
- }
- static void
- usage(void)
- {
- fprintf(stderr, "%s\n%s\n",
- "usage: yacc [-dlrtv] [-b file_prefix] [-o output_filename]",
- " [-p symbol_prefix] filename");
- exit(1);
- }
- static void
- getargs(int argc, char *argv[])
- {
- int ch;
- while ((ch = getopt(argc, argv, "b:dlo:p:rtvy")) != -1)
- {
- switch (ch)
- {
- case 'b':
- file_prefix = optarg;
- break;
- case 'd':
- dflag = 1;
- break;
- case 'l':
- lflag = 1;
- break;
- case 'o':
- output_file_name = optarg;
- break;
- case 'p':
- symbol_prefix = optarg;
- break;
- case 'r':
- rflag = 1;
- break;
- case 't':
- tflag = 1;
- break;
- case 'v':
- vflag = 1;
- break;
- case 'y':
- /* for bison compatibility -- byacc is already POSIX compatible */
- break;
- default:
- usage();
- }
- }
- if (optind + 1 != argc)
- usage();
- if (strcmp(argv[optind], "-") == 0)
- input_file = stdin;
- else
- input_file_name = argv[optind];
- }
- void *
- allocate(size_t n)
- {
- void *p;
- p = NULL;
- if (n)
- {
- p = calloc(1, n);
- if (!p) no_space();
- }
- return (p);
- }
- static void
- create_file_names(void)
- {
- int i, len;
- const char *tmpdir;
- if (!(tmpdir = getenv("TMPDIR")))
- tmpdir = _PATH_TMP;
- len = strlen(tmpdir);
- i = len + strlen(temp_form) + 1;
- if (len && tmpdir[len-1] != '/')
- ++i;
- action_file_name = malloc(i);
- if (action_file_name == 0) no_space();
- text_file_name = malloc(i);
- if (text_file_name == 0) no_space();
- union_file_name = malloc(i);
- if (union_file_name == 0) no_space();
- strcpy(action_file_name, tmpdir);
- strcpy(text_file_name, tmpdir);
- strcpy(union_file_name, tmpdir);
- if (len && tmpdir[len - 1] != '/')
- {
- action_file_name[len] = '/';
- text_file_name[len] = '/';
- union_file_name[len] = '/';
- ++len;
- }
- strcpy(action_file_name + len, temp_form);
- strcpy(text_file_name + len, temp_form);
- strcpy(union_file_name + len, temp_form);
- action_file_name[len + 5] = 'a';
- text_file_name[len + 5] = 't';
- union_file_name[len + 5] = 'u';
- if (output_file_name != 0)
- {
- file_prefix = output_file_name;
- len = strlen(file_prefix);
- }
- else
- {
- len = strlen(file_prefix);
- output_file_name = malloc(len + 7);
- if (output_file_name == 0)
- no_space();
- strcpy(output_file_name, file_prefix);
- strcpy(output_file_name + len, OUTPUT_SUFFIX);
- }
- if (rflag)
- {
- code_file_name = malloc(len + 8);
- if (code_file_name == 0)
- no_space();
- strcpy(code_file_name, file_prefix);
- if (file_prefix == output_file_name)
- {
- /*
- * XXX ".tab.c" here is OUTPUT_SUFFIX, but since its length is
- * in various magic numbers, don't bother using the macro.
- */
- if (len >= 6 && strcmp(code_file_name + len - 6, ".tab.c") == 0)
- strcpy(code_file_name + len - 6, CODE_SUFFIX);
- else if (len >= 2 && strcmp(code_file_name + len - 2, ".c") == 0)
- strcpy(code_file_name + len - 2, CODE_SUFFIX);
- else
- strcpy(code_file_name + len, CODE_SUFFIX);
- }
- else
- strcpy(code_file_name + len, CODE_SUFFIX);
- }
- else
- code_file_name = output_file_name;
- if (dflag)
- {
- defines_file_name = malloc(len + 7);
- if (defines_file_name == 0)
- no_space();
- strcpy(defines_file_name, file_prefix);
- if (file_prefix == output_file_name)
- {
- #define BISON_DEFINES_SUFFIX ".h"
- if (len >= 2 && strcmp(defines_file_name + len - 2, ".c") == 0)
- strcpy(defines_file_name + len - 2, BISON_DEFINES_SUFFIX);
- else
- strcpy(defines_file_name + len, BISON_DEFINES_SUFFIX);
- }
- else
- strcpy(defines_file_name + len, DEFINES_SUFFIX);
- }
- if (vflag)
- {
- verbose_file_name = malloc(len + 8);
- if (verbose_file_name == 0)
- no_space();
- strcpy(verbose_file_name, file_prefix);
- if (file_prefix == output_file_name)
- {
- if (len >= 6 && strcmp(verbose_file_name + len - 6, ".tab.c") == 0)
- strcpy(verbose_file_name + len - 6, VERBOSE_SUFFIX);
- else if (len >= 2 && strcmp(verbose_file_name + len - 2, ".c") == 0)
- strcpy(verbose_file_name + len - 2, VERBOSE_SUFFIX);
- else
- strcpy(verbose_file_name + len, VERBOSE_SUFFIX);
- }
- else
- strcpy(verbose_file_name + len, VERBOSE_SUFFIX);
- }
- }
- static void
- open_files(void)
- {
- int fd;
- create_file_names();
- if (input_file == 0)
- {
- input_file = fopen(input_file_name, "r");
- if (input_file == 0)
- open_error(input_file_name);
- }
- fd = mkstemp(action_file_name);
- if (fd < 0 || (action_file = fdopen(fd, "w")) == NULL) {
- if (fd >= 0)
- close(fd);
- open_error(action_file_name);
- }
- fd = mkstemp(text_file_name);
- if (fd < 0 || (text_file = fdopen(fd, "w")) == NULL) {
- if (fd >= 0)
- close(fd);
- open_error(text_file_name);
- }
- fd = mkstemp(union_file_name);
- if (fd < 0 || (union_file = fdopen(fd, "w")) == NULL) {
- if (fd >= 0)
- close(fd);
- open_error(union_file_name);
- }
- text_file = fopen(text_file_name, "w");
- if (text_file == 0)
- open_error(text_file_name);
- if (vflag)
- {
- verbose_file = fopen(verbose_file_name, "w");
- if (verbose_file == 0)
- open_error(verbose_file_name);
- }
- if (dflag)
- {
- defines_file = fopen(defines_file_name, "w");
- if (defines_file == 0)
- open_error(defines_file_name);
- union_file = fopen(union_file_name, "w");
- if (union_file == 0)
- open_error(union_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[])
- {
- set_signals();
- getargs(argc, argv);
- open_files();
- reader();
- lr0();
- lalr();
- make_parser();
- verbose();
- output();
- done(0);
- /*NOTREACHED*/
- return (0);
- }