shithub: mc

ref: f7fc1cd4e2b36f2ae8d124c4654eac7f48aadff8
dir: /mbld/build.myr/

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 = 0
	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
}