1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/* Top level entry point of bison,
Copyright (C) 1984, 1986, 1989 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
Bison is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
Bison is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bison; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include <string>
using namespace std;
#include "system.h"
#include "machine.h" /* JF for MAXSHORT */
bool bison_compability;
extern int lineno;
extern int verboseflag;
/* Nonzero means failure has been detected; don't write a parser file. */
int failure;
/* The name this program was run with, for messages. */
char *program_name;
extern void getargs(int,char**), openfiles(), reader(), reduce_grammar();
extern void set_derives(), set_nullable(), generate_states();
extern void lalr(), initialize_conflicts(), verbose(), terse();
extern void output(), done(int);
void fatal(const char*);
extern int fixed_outfiles;
string getName(string FullPath)
{
int i = FullPath.length()-2;
while(i > 0 && FullPath[i] != '/') i--;
if(i<=0 || i+1>= FullPath.length()-1) return FullPath;
else return FullPath.substr(i+1,FullPath.length()-1);
}
/* VMS complained about using `int'. */
int
main(int argc, char** argv)
{
program_name = argv[0];
failure = 0;
lineno = 0;
getargs(argc, argv);
string onlyName = getName(string(program_name));
if(onlyName != "bison++")
{
bison_compability=true;
}
else
{
if(onlyName != "yacc")
fixed_outfiles = 1;
bison_compability=false;
}
openfiles();
/* read the input. Copy some parts of it to fguard, faction, ftable and fattrs.
In file reader.c.
The other parts are recorded in the grammar; see gram.h. */
reader();
/* find useless nonterminals and productions and reduce the grammar. In
file reduce.c */
reduce_grammar();
/* record other info about the grammar. In files derives and nullable. */
set_derives();
set_nullable();
/* convert to nondeterministic finite state machine. In file LR0.
See state.h for more info. */
generate_states();
/* make it deterministic. In file lalr. */
lalr();
/* Find and record any conflicts: places where one token of lookahead is not
enough to disambiguate the parsing. In file conflicts.
Currently this does not do anything to resolve them;
the trivial form of conflict resolution that exists is done in output. */
initialize_conflicts();
/* print information about results, if requested. In file print. */
if (verboseflag)
verbose();
else
terse();
/* output the tables and the parser to ftable. In file output. */
output();
done(failure);
}
/* functions to report errors which prevent a parser from being generated */
void
toomany(char* s)
{
char buffer[200];
/* JF new msg */
sprintf(buffer, "limit of %d exceeded, too many %s", MAXSHORT, s);
fatal(buffer);
}
void
berror(char* s)
{
fprintf(stderr, "internal error, %s\n", s);
abort();
}
void
fatal(const char* s)
{
extern char *infile;
if (infile == 0)
fprintf(stderr, "fatal error: %s\n", s);
else
fprintf(stderr, "\"%s\", line %d: %s\n", infile, lineno, s);
done(1);
}
void
fatals(const char* fmt,void* x1)
{
char buffer[200];
sprintf(buffer, fmt, x1);
fatal(buffer);
}
void
fatals(const char* fmt,void* x1,void* x2)
{
char buffer[200];
sprintf(buffer, fmt, x1,x2);
fatal(buffer);
}
void
fatals(const char* fmt,void* x1,void* x2,void* x3)
{
char buffer[200];
sprintf(buffer, fmt, x1,x2,x3);
fatal(buffer);
}
void
fatals(const char* fmt,void* x1,void* x2,void* x3,void* x4)
{
char buffer[200];
sprintf(buffer, fmt, x1,x2,x3,x4);
fatal(buffer);
}
|
