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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
(***********************************************************************)
(* *)
(* OCaml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the Q Public License version 1.0. *)
(* *)
(***********************************************************************)
(* $Id: lexcmm.mll 12858 2012-08-10 14:45:51Z maranget $ *)
{
open Parsecmm
type error =
Illegal_character
| Unterminated_comment
| Unterminated_string
exception Error of error
(* For nested comments *)
let comment_depth = ref 0
(* The table of keywords *)
let keyword_table =
Misc.create_hashtable 149 [
"absf", ABSF;
"addr", ADDR;
"align", ALIGN;
"alloc", ALLOC;
"and", AND;
"app", APPLY;
"assign", ASSIGN;
"byte", BYTE;
"case", CASE;
"catch", CATCH;
"checkbound", CHECKBOUND;
"exit", EXIT;
"extcall", EXTCALL;
"float", FLOAT;
"float32", FLOAT32;
"float64", FLOAT64;
"floatofint", FLOATOFINT;
"function", FUNCTION;
"half", HALF;
"if", IF;
"int", INT;
"int32", INT32;
"intoffloat", INTOFFLOAT;
"string", KSTRING;
"let", LET;
"load", LOAD;
"mod", MODI;
"or", OR;
"proj", PROJ;
"raise", RAISE;
"seq", SEQ;
"signed", SIGNED;
"skip", SKIP;
"store", STORE;
"switch", SWITCH;
"try", TRY;
"unit", UNIT;
"unsigned", UNSIGNED;
"while", WHILE;
"with", WITH;
"xor", XOR;
"addraref", ADDRAREF;
"intaref", INTAREF;
"floataref", FLOATAREF;
"addraset", ADDRASET;
"intaset", INTASET;
"floataset", FLOATASET
]
(* To buffer string literals *)
let initial_string_buffer = String.create 256
let string_buff = ref initial_string_buffer
let string_index = ref 0
let reset_string_buffer () =
string_buff := initial_string_buffer;
string_index := 0
let store_string_char c =
if !string_index >= String.length (!string_buff) then begin
let new_buff = String.create (String.length (!string_buff) * 2) in
String.blit (!string_buff) 0 new_buff 0 (String.length (!string_buff));
string_buff := new_buff
end;
String.unsafe_set (!string_buff) (!string_index) c;
incr string_index
let get_stored_string () =
let s = String.sub (!string_buff) 0 (!string_index) in
string_buff := initial_string_buffer;
s
(* To translate escape sequences *)
let char_for_backslash = function
'n' -> '\010'
| 'r' -> '\013'
| 'b' -> '\008'
| 't' -> '\009'
| c -> c
let char_for_decimal_code lexbuf i =
Char.chr(100 * (Char.code(Lexing.lexeme_char lexbuf i) - 48) +
10 * (Char.code(Lexing.lexeme_char lexbuf (i+1)) - 48) +
(Char.code(Lexing.lexeme_char lexbuf (i+2)) - 48))
(* Error report *)
let report_error lexbuf msg =
prerr_string "Lexical error around character ";
prerr_int (Lexing.lexeme_start lexbuf);
match msg with
Illegal_character ->
prerr_string ": illegal character"
| Unterminated_comment ->
prerr_string ": unterminated comment"
| Unterminated_string ->
prerr_string ": unterminated string"
}
rule token = parse
[' ' '\010' '\013' '\009' '\012'] +
{ token lexbuf }
| "+a" { ADDA }
| "+f" { ADDF }
| "+" { ADDI }
| ">>s" { ASR }
| ":" { COLON }
| "/f" { DIVF }
| "/" { DIVI }
| eof { EOF }
| "==a" { EQA }
| "==f" { EQF }
| "==" { EQI }
| ">=a" { GEA }
| ">=f" { GEF }
| ">=" { GEI }
| ">a" { GTA }
| ">f" { GTF }
| ">" { GTI }
| "[" { LBRACKET }
| "<=a" { LEA }
| "<=f" { LEF }
| "<=" { LEI }
| "(" { LPAREN }
| "<<" { LSL }
| ">>u" { LSR }
| "<a" { LTA }
| "<f" { LTF }
| "<" { LTI }
| "*f" { MULF }
| "*" { MULI }
| "!=a" { NEA }
| "!=f" { NEF }
| "!=" { NEI }
| "]" { RBRACKET }
| ")" { RPAREN }
| "*" { STAR }
| "-a" { SUBA }
| "-f" { SUBF }
| "-" { SUBI }
| '-'? (['0'-'9']+ | "0x" ['0'-'9' 'a'-'f' 'A'-'F']+
| "0o" ['0'-'7']+ | "0b" ['0'-'1']+)
{ INTCONST(int_of_string(Lexing.lexeme lexbuf)) }
| '-'? ['0'-'9']+ 'a'
{ let s = Lexing.lexeme lexbuf in
POINTER(int_of_string(String.sub s 0 (String.length s - 1))) }
| '-'? ['0'-'9']+ ('.' ['0'-'9']*)? (['e' 'E'] ['+' '-']? ['0'-'9']+)?
{ FLOATCONST(Lexing.lexeme lexbuf) }
| ['A'-'Z' 'a'-'z' '\223'-'\246' '\248'-'\255' ]
(['A'-'Z' 'a'-'z' '_' '\192'-'\214' '\216'-'\246' '\248'-'\255'
'\'' '0'-'9' ]) *
{ let s = Lexing.lexeme lexbuf in
try
Hashtbl.find keyword_table s
with Not_found ->
IDENT s }
| "\""
{ reset_string_buffer();
string lexbuf;
STRING (get_stored_string()) }
| "(*"
{ comment_depth := 1;
comment lexbuf;
token lexbuf }
| _ { raise(Error(Illegal_character)) }
and comment = parse
"(*"
{ comment_depth := succ !comment_depth; comment lexbuf }
| "*)"
{ comment_depth := pred !comment_depth;
if !comment_depth > 0 then comment lexbuf }
| eof
{ raise (Error(Unterminated_comment)) }
| _
{ comment lexbuf }
and string = parse
'"'
{ () }
| '\\' [' ' '\010' '\013' '\009' '\026' '\012'] +
{ string lexbuf }
| '\\' ['\\' '"' 'n' 't' 'b' 'r']
{ store_string_char(char_for_backslash(Lexing.lexeme_char lexbuf 1));
string lexbuf }
| '\\' ['0'-'9'] ['0'-'9'] ['0'-'9']
{ store_string_char(char_for_decimal_code lexbuf 1);
string lexbuf }
| eof
{ raise (Error(Unterminated_string)) }
| _
{ store_string_char(Lexing.lexeme_char lexbuf 0);
string lexbuf }
|
