summaryrefslogtreecommitdiff
path: root/mbld/build.myr
blob: 7dfec9997884205b58010d79b1c7ba8170fe3e00 (plain)
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
use std

use "config"
use "opts"
use "types"
use "util"

pkg bld =
	const buildtarg	: (b : build#, targ : byte[:] -> bool)
	const clean	: (b : build# -> bool)
;;

const buildtarg = {b, targ
	var g, targs

	g = b.deps
	match std.htget(g.targs, targ)
	| `std.Some t:	targs = t
	| `std.None:	std.fatal("unknown target: {}\n", targ)
	;;
	for t : targs
		mark(b, t)
	;;
	build(b, g)
	-> !b.fail
}

const clean = {b
	for n : b.deps.nodes
		if n.durable
			continue
		;;
		for g : n.gen
			if std.remove(g)
				mbldput("\tclean {}\n", g)
			;;
		;;
	;;
	-> true
}

const mark = {b, o
	if o.want
		-> void
	;;

	o.want = true
	for n : o.ndep
		mark(b, n)
	;;
}

const build = {b, g
	for n : g.leaves
		if n.want
			/* stale() updates the mtime of the leaf node */
			stale(b, n)
			unblock(b, n)
		;;
	;;

	while std.htcount(b.proc) != 0 || b.queue.len != 0
		while std.htcount(b.proc) < opt_maxproc && b.queue.len > 0
			launch(b, std.slpop(&b.queue))
		;;
		wait(b)
	;;
}

const launch = {b, n
	var pid

	if stale(b, n)
		mkout(n)
		pid = run(n.cmd, "")
		std.htput(b.proc, pid, n)
	else
		unblock(b, n)
	;;
}

const wait = {b
	var pp : std.pid

	if std.htcount(b.proc) == 0
		-> void
	;;
	match std.waitany()
	| (p, `std.Wfailure):	fail(b, p, "FAIL")
	| (p, `std.Wsignalled):	fail(b, p, "CRASH")
	| (p, `std.Waiterror):	std.fatal("error waiting: nproc={}\n", std.htcount(b.proc))
	| (p, `std.Wsuccess):
		pp = p
		match std.htget(b.proc, p)
		| `std.None:
			std.fatal("followed home by stray pid {}\n", p)
		| `std.Some n:
			n.mtime = std.now()
			std.htdel(b.proc, p)
			unblock(b, n)
		;;
	;;
}

const proclbl = {b, pid
	match std.htget(b.proc, pid)
	| `std.Some n:	-> n.cmd
	| `std.None:	-> std.sldup(["?unknown?"][:])
	;;
}

const unblock = {b, n
	if b.fail
		-> void
	;;
	for g : n.ngen
		std.assert(g.nblock != 0, "bogus unblock {} from {}\n", g.lbl, n.lbl)
		g.nblock--
		if g.nblock == 0 && g.want
			std.slpush(&b.queue, g)
		;;
	;;
}

const stale = {b, n
	var staletime

	staletime = n.deptime
	for d : n.ndep
		staletime = std.max(staletime, d.mtime)
	;;

	n.mtime = std.now()
	for g : n.gen
		match std.fmtime(g)
		| `std.Ok tm:	n.mtime = std.min(n.mtime, tm)
		| `std.Err e:	n.mtime = 0
		;;
	;;
	-> staletime > n.mtime
}

const mkout = {n
	for g : n.gen
		std.mkpath(std.dirname(g))
	;;
}

const fail = {b, pid, failtype
	std.fput(std.Err, "{}: {j= }\n", failtype, proclbl(b, pid))
	std.htdel(b.proc, pid)
	std.slfree(b.queue)
	b.queue = [][:]
	b.fail = true
}