blob: aa9eeff81b17e0a988e661351378e949f04f1593 (
plain) (
blame)
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
|
%{
#include "cibic.tab.h"
#include "const.h"
#include "semantics.h"
int yycolumn = 1;
char linebuff[MAX_LINEBUFF], *lptr = linebuff;
#define YY_USER_ACTION \
do { \
yylloc.first_line = yylloc.last_line = yylineno; \
yylloc.first_column = yycolumn; \
yylloc.last_column = yycolumn + yyleng - 1; \
yycolumn += yyleng; \
memmove(lptr, yytext, yyleng); \
lptr += yyleng; \
} while (0);
#define NEW_LINE_USER_ACTION \
do { \
yycolumn = 1; \
lptr = linebuff; \
} while (0)
%}
letter [a-zA-Z_$]
digit [0-9]
string ((\\.|[^\n\"\\])*)
char ([^\n'\\]|\\.|\\[0-7]+|\\[xX][0-9a-fA-F]+)
%s IN_BLOCK_COMMENT IN_INLINE_COMMENT IN_DIRECTIVE
%option yylineno
%%
<INITIAL>{
"/*" BEGIN(IN_BLOCK_COMMENT);
}
<IN_BLOCK_COMMENT>{
"*/" BEGIN(INITIAL);
[^*\n]+ // eat comment in chunks
"*" // eat the lone star
\n { NEW_LINE_USER_ACTION; }
}
<INITIAL>{
"//" BEGIN(IN_INLINE_COMMENT);
}
<IN_INLINE_COMMENT>{
\n { NEW_LINE_USER_ACTION; BEGIN(INITIAL); }
[^\n]+
}
<INITIAL>{
"#" BEGIN(IN_DIRECTIVE);
}
<IN_DIRECTIVE>{
\n { NEW_LINE_USER_ACTION; BEGIN(INITIAL); }
[^\n]+
}
"void" { return KW_VOID; }
"char" { return KW_CHAR; }
"int" { return KW_INT; }
"struct" { return KW_STRUCT; }
"union" { return KW_UNION; }
"if" { return KW_IF; }
"else" { return KW_ELSE; }
"while" { return KW_WHILE; }
"for" { return KW_FOR; }
"continue" { return KW_CONT; }
"break" { return KW_BREAK; }
"return" { return KW_RET; }
"sizeof" { return KW_SIZEOF; }
"typedef" { return KW_TYPEDEF; }
{letter}({letter}|{digit})* {
yylval.strval = strdup(yytext);
return is_identifier(yytext) ? IDENTIFIER : USER_TYPE;
}
({digit}+)|(0[xX][0-9a-fA-F]+) {
if (*yytext == '0')
{
if (*(yytext + 1) == 'x' || *(yytext + 1) == 'X')
sscanf(yytext, "%x", &yylval.intval);
else // FIXME: error report if it is not a valid octal
sscanf(yytext, "%o", &yylval.intval);
}
else yylval.intval = atoi(yytext);
return INT_CONST;
}
'{char}' {
yylval.strval = strndup(yytext + 1, strlen(yytext) - 2);
return CHAR_CONST;
}
'{char}? {
yyerror("missing terminating ' character\n");
exit(1);
}
\"{string}\" {
yylval.strval = strndup(yytext + 1, strlen(yytext) - 2);
return STR_CONST;
}
\"{string}? {
yyerror("missing terminating \" character\n");
exit(1);
}
"||" { return OPT_OR; }
"&&" { return OPT_AND; }
"==" { return OPT_EQ; }
"!=" { return OPT_NE; }
"<=" { return OPT_LE; }
">=" { return OPT_GE; }
"<<" { return OPT_SHL; }
">>" { return OPT_SHR; }
"++" { return OPT_INC; }
"--" { return OPT_DEC; }
"->" { return OPT_PTR; }
"*=" { return ASS_MUL; }
"/=" { return ASS_DIV; }
"%=" { return ASS_MOD; }
"+=" { return ASS_ADD; }
"-=" { return ASS_SUB; }
"<<=" { return ASS_SHL; }
">>=" { return ASS_SHR; }
"&=" { return ASS_AND; }
"^=" { return ASS_XOR; }
"|=" { return ASS_OR; }
[();,={}\[\]*|\^&<>+\-*//%~!.] { return *yytext; }
[ \t\r] /* skip whitespaces */
\n { NEW_LINE_USER_ACTION; }
. { return UNKNOWN; }
%%
|