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
|
#!/run/current-system/profile/bin/guile \
-L ./src -e main -s
!#
(use-modules (ice-9 getopt-long)
(ice-9 popen)
(ice-9 pretty-print)
(frontend driver)
(backend tacky driver)
(backend generator driver)
(backend emitter driver))
(define version "v0.1.1")
(define (error message)
(display (string-concatenate `(,message "
Usage:
ull [OPTIONS] file
Options:
--version, -v: print version information
--debug, -d: turn on verbose output
--lex, -l: run the lexer, but stop before assembly generation
--parse, -p: run the lexer and parser, but stop before assembly generation
--tacky, -t: run the tacky generation stage, but stop before assembly generation
--codegen, -c: perform lexing, parsing, tacky, and assembly generation, but stop before code emission\n")))
(exit #f))
(define (c-extension? file)
(let ((extension (string-drop file (- (string-length file) 2))))
(string=? extension ".c")))
(define (cleanup-file file)
(when (file-exists? file)
(delete-file file)))
(define (preprocess src dst)
"Preprocesses SRC with gcc and write it to DST."
(system (string-concatenate `("gcc -E -P " ,src " -o " ,dst)))
(display (string-concatenate `("Preprocess reported success (wrote " ,dst ").\n"))))
(define (frontend file parse?)
"Wrapper for lexing and parsing. Returns an AST representing FILE."
(let ((c-ast (file->ast file parse?)))
(or c-ast
(begin
(display (format #f "~a reported failure!\n" (or (and parse? "Parser") "Lexer")))
(cleanup-file file)
(exit #f)))))
(define (backend c-ast tack? generate? write?)
"Driver for tacky and assembly generation, code emission. Returns an assembly program representing C-AST."
(pretty-print c-ast)
(display "===^file->ast^===\n")
(when tack?
(let ((tacky-ast (ast->tacky c-ast)))
(pretty-print tacky-ast)
(display "===^ast->tacky^===\n")
(when generate?
(let ((assembly-ast (tacky->assembly tacky-ast)))
(pretty-print assembly-ast)
(display "===^tacky->assembly^===\n")
(when write?
(assembly->string assembly-ast)))))))
(define (postprocess src dest)
"Assembles and links SRC, producing executable DEST.
Returns #f on a failure, #t on a success."
(zero? (system (string-concatenate `("gcc " ,src " -o " ,dest)))))
(define (write str dst)
"Writes STR to the file at DST."
(cleanup-file dst)
(let ((port (open-output-file dst)))
(display str port)
(close-port port))
(display (string-concatenate `("Assembly generation reported success (wrote " ,dst ").\n"))))
(define (main args)
"Entry point for ull. Handles user args and performs initial validity check."
(let* ((option-spec
'((version (single-char #\v) (value #f))
(debug (single-char #\d) (value #f))
(lex (single-char #\l) (value #f))
(parse (single-char #\p) (value #f))
(tacky (single-char #\t) (value #f))
(codegen (single-char #\c) (value #f))))
(options (getopt-long args option-spec))
(rest (option-ref options '() #f))
(file-name (if (null? rest) #f (car rest))) )
(cond
;; display version number
((option-ref options 'version #f)
(display (string-concatenate `("ull (" ,version ")\n"))))
;; complain about usage
((not (equal? 1 (length rest))) (error "Wrong number of arguments."))
((or (not file-name)
(not (access? file-name R_OK))
(not (equal? 'regular (stat:type (stat file-name))))
(not (c-extension? file-name))) (error "The file could not be read, or it is not a C source code file."))
(#t
(let ((parse? (not (option-ref options 'lex #f)))
(tack? (not (option-ref options 'parse #f)))
(generate? (not (option-ref options 'tacky #f)))
(write? (not (option-ref options 'codegen #f)))
(preprocessed-file-name
(string-concatenate `(,(string-drop-right file-name 1) "i")))
(assembly-file-name
(string-concatenate `(,(string-drop-right file-name 1) "s")))
(executable-file-name
(string-drop-right file-name 2)))
;; preprocess the file
(preprocess file-name preprocessed-file-name)
;; call the frontend
(let ((c-ast (frontend preprocessed-file-name parse?)))
(cleanup-file preprocessed-file-name)
(if (and parse? c-ast)
;; call the backend
(begin (display "Parser reported success\n")
(let ((program (backend c-ast tack? generate? write?)))
(when (and write? (not tack?) (not generate?))
(write program assembly-file-name)
;; call postprocessing
(postprocess assembly-file-name executable-file-name))))
(display "Tokenizer reported success\n"))))))))
|
