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discard """
output: "MEM 0"
cmd: "nim c --gc:orc $file"
"""
type
Node = ref object
name: char
sccId: int
#a: array[3, Node]
a0, a1, a2: Node
rc: int
proc edge(a, b: Node) =
inc b.rc
if a.a0 == nil: a.a0 = b
elif a.a1 == nil: a.a1 = b
else: a.a2 = b
when false:
var i = 0
while a.a[i] != nil: inc i
a.a[i] = b
proc createNode(name: char): Node =
new result
result.name = name
#[
+--------------------------------+
v |
+---------+ +------+ |
| | | | |
| A +----->+ | +------+------+
+--+------+ | | | |
| | | | C ------------> G <--|
| | R | | |
+--v------+ | | +-------------+
| | | | ^
| B <------+ | |
| | | +--------+
+---------+ | |
+------+
]#
proc use(x: Node) = discard
proc main =
let a = createNode('A')
let b = createNode('B')
let r = createNode('R')
let c = createNode('C')
a.edge b
a.edge r
r.edge b
r.edge c
let g = createNode('G')
g.edge g
g.edge g
c.edge g
c.edge a
use g
use b
proc buildComplexGraph: Node =
# see https://en.wikipedia.org/wiki/Strongly_connected_component for the
# graph:
let a = createNode('a')
let b = createNode('b')
let c = createNode('c')
let d = createNode('d')
let e = createNode('e')
a.edge c
c.edge b
c.edge e
b.edge a
d.edge c
e.edge d
let f = createNode('f')
b.edge f
e.edge f
let g = createNode('g')
let h = createNode('h')
let i = createNode('i')
f.edge g
f.edge i
g.edge h
h.edge i
i.edge g
let j = createNode('j')
h.edge j
i.edge j
let k = createNode('k')
let l = createNode('l')
f.edge k
k.edge l
l.edge k
k.edge j
let m = createNode('m')
let n = createNode('n')
let p = createNode('p')
let q = createNode('q')
m.edge n
n.edge p
n.edge q
q.edge p
p.edge m
q.edge k
d.edge m
e.edge n
result = a
proc main2 =
let g = buildComplexGraph()
main()
main2()
GC_fullCollect()
echo "MEM ", getOccupiedMem()
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