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kiesler.at

Random Guide to whatever
updated by rck, 2004-10-10

Another case of trying out the swallow hack 0.2. This time, I'm shuffling some sections around. Enjoy!

0 < n < 100

Seit ich das Inline-Assemblerkonzept kenne, habe ich mich immer wieder vor "purem" Assembler gedrückt. Bis jetzt jedes mal erfolgreich. Und die eingesparte Zeit kann man dann zB für das Schreiben solcher Tutorials verwenden... ;-)

Inline-Assembler spielt seine wahren Stärken bei Speicherzugriffen (Stichwort: Alignment) und Schleifen (Stichwort: Label) aus. Auch bei kleinen Aufgabenstellungen, für die ein "richtiges" Assemblerprogramm zu mühsam wäre, kann man mit Inline-Assembler Performance gewinnen (siehe asma).

100 < n < 200

1 /*                      scanner.lex
2                         (c) 2004 René C. Kiesler
3 
4                         please visit http://www.kiesler.at/
5                         for further informations & support.
6 */
7 
8                 
9                         #include <math.h>
10 
11                         int num_lines = 1;
12                         int last_open_sighting = -1;
13 
14 
15 KEYWORD                 func|where|end|if|then|else|not|hd|tl|islist|and
16 OPERATOR                \:|\;|\,|\=|\-|\+|\*|\<|\(|\)
17 LEXEM                   {KEYWORD}|{OPERATOR}
18 
19 HEXZAHL                 0x[0-9a-fA-F]+
20 DECZAHL                 [0-9]+
21 
22 IDENTIFIER              [a-zA-Z][0-9a-zA-Z]*
23 
24 WHITESPACE              [ \t]+
25 COMMENT_START           \(\*
26 COMMENT_END             \*\)
27 
28 NEWLINE                 \n
29 
30 ANYCHAR                 .
31 
32 
33 %x COMMENT
34 %%
35 
36 
37 {COMMENT_START}         {       BEGIN(COMMENT);
38                                 last_open_sighting = num_lines;
39                         }
40 <COMMENT>{COMMENT_END}  BEGIN(INITIAL);
41 <COMMENT><<EOF>>        {       fprintf(stderr,
42                                         "unmatched opening comment in line %d, %s\n",
43                                         last_open_sighting, "eof reached.");
44                                 exit(1);
45                         }
46 <COMMENT>\n             num_lines++;
47 <COMMENT>.              /* alles im Kommentar ignorieren */
48 
49 {WHITESPACE}            /* Whitespace, wird ignoriert */
50 {NEWLINE}               num_lines++;
51 
52 {LEXEM}                 printf("%s\n", yytext);
53 
54 {DECZAHL}               printf("num 0x%x\n", atoi(yytext));
55 {HEXZAHL}               printf("num 0x%x\n", strtol(yytext, 0, 16));
56 
57 {IDENTIFIER}            printf("ident %s\n", yytext);
58 
59 {ANYCHAR}               {       fprintf(stderr,
60                                         "unknown character '%s' in line %d.\n",
61                                         yytext, num_lines);
62                                 exit(1);
63                         }
64 
65 %%
66 
67 
68                         main(int argc, char **argv) {
69                                 yyin=argc>1 ? fopen(argv[1], "r") : stdin;
70                                 yylex();
71                                 exit(0);
72                         }
73 

200 < n < 300

...greifen, wie geschrieben, oft genug auf readWord zu. Ein Beispiel:

197         public static short readShort() throws EprogException {
198                 short word0 = 0;
199                 try {
200                         word0 = Short.valueOf(readWord()).shortValue();
201                 }
202                 catch(NumberFormatException numberformatexception) {
203                         throw new EprogException("Wrong Datatype: Not a Short");
204                 }
205                 return word0;
206         }

here you can see some nonsense article. in case it makes sense, it's all fault of Swallow Hack 0.5 for Article Manager!



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