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
open Stdlib
let debug = Debug.find "binaryen"
let times = Debug.find "binaryen-times"
let command cmdline =
let cmdline = String.concat ~sep:" " cmdline in
if debug () then Format.eprintf "+ %s@." cmdline;
let res = Sys.command ((if times () then "BINARYEN_PASS_DEBUG=1 " else "") ^ cmdline) in
if res <> 0 then failwith ("the following command terminated unsuccessfully: " ^ cmdline)
let common_options () =
let l =
[ "--enable-gc"
; "--enable-multivalue"
; "--enable-exception-handling"
; "--enable-reference-types"
; "--enable-tail-call"
; "--enable-bulk-memory"
; "--enable-nontrapping-float-to-int"
; "--enable-strings"
]
in
let l = if Config.Flag.pretty () then "-g" :: l else l in
let l = if times () then "--no-validation" :: l else l in
l
let opt_flag flag v =
match v with
| None -> []
| Some v -> [ flag; Filename.quote v ]
type link_input =
{ module_name : string
; file : string
; source_map_file : string option
}
let link ?options ~inputs ~opt_output_sourcemap ~output_file () =
command
("wasm-merge"
:: (common_options ()
@ Option.value ~default:[] options
@ List.flatten
(List.map
~f:(fun { file; module_name; source_map_file } ->
Filename.quote file
:: module_name
::
(match source_map_file with
| None -> []
| Some file -> [ "--input-source-map"; Filename.quote file ]))
inputs)
@ [ "-o"; Filename.quote output_file ]
@ opt_flag "--output-source-map" opt_output_sourcemap))
let generate_dependencies ~dependencies primitives =
Yojson.Basic.to_string
(`List
(StringSet.fold
(fun nm s ->
`Assoc
[ "name", `String ("js:" ^ nm)
; "import", `List [ `String "js"; `String nm ]
]
:: s)
primitives
(Yojson.Basic.Util.to_list (Yojson.Basic.from_string dependencies))))
let filter_unused_primitives primitives usage_file =
let ch = open_in_bin usage_file in
let s = ref primitives in
(try
while true do
let l = input_line ch in
match String.drop_prefix ~prefix:"unused: js:" l with
| Some nm -> s := StringSet.remove (String.trim nm) !s
| None -> ()
done
with End_of_file -> ());
!s
let dead_code_elimination
~dependencies
~opt_input_sourcemap
~input_file
~opt_output_sourcemap
~output_file =
Fs.with_intermediate_file (Filename.temp_file "deps" ".json")
@@ fun deps_file ->
Fs.with_intermediate_file (Filename.temp_file "usage" ".txt")
@@ fun usage_file ->
let primitives = Linker.list_all () in
Fs.write_file ~name:deps_file ~contents:(generate_dependencies ~dependencies primitives);
command
("wasm-metadce"
:: (common_options ()
@ [ "--graph-file"; Filename.quote deps_file; Filename.quote input_file ]
@ opt_flag "--input-source-map" opt_input_sourcemap
@ [ "-o"; Filename.quote output_file ]
@ opt_flag "--output-source-map" opt_output_sourcemap
@ [ ">"; Filename.quote usage_file ]));
filter_unused_primitives primitives usage_file
let optimization_options : Profile.t -> _ = function
| O1 -> [ "-O2"; "--skip-pass=inlining-optimizing"; "--traps-never-happen" ]
| O2 -> [ "-O2"; "--skip-pass=inlining-optimizing"; "--traps-never-happen" ]
| O3 -> [ "-O3"; "--skip-pass=inlining-optimizing"; "--traps-never-happen" ]
let optimize
~profile
?options
~opt_input_sourcemap
~input_file
~opt_output_sourcemap
~output_file
() =
command
("wasm-opt"
:: (common_options ()
@ (match options with
| Some o -> o
| None -> optimization_options profile)
@ [ Filename.quote input_file; "-o"; Filename.quote output_file ])
@ opt_flag "--input-source-map" opt_input_sourcemap
@ opt_flag "--output-source-map" opt_output_sourcemap)