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The `gc()` function allows controlling the garbage collector of the VM.
It takes the requested operation as first argument and an optional,
operation specific second argument.
Returns `null` if the given operation is invalid or if the operation
specific argument is invalid.
Returns `false` if the requested operation would not result in any
changes.
Returns `true` if the requested oepration succeeded (e.g. starting
the GC when it was previously stopped).
Returns an object count if the given operation is `count`.
-- Testcase --
{%
printf("Count #1: %d\n", gc("count"));
// create an unreachable cyclic structure
let o = {};
o.cycle = o;
o = null;
printf("Count #2: %d\n", gc("count"));
// invoking gc without any argument defaults to "collect"
gc();
printf("Count #3: %d\n", gc("count"));
// create another unreachable cyclic structure
o = {};
o.cycle = o;
o = null;
printf("Count #4: %d\n", gc("count"));
// invoking gc with explicit collect argument
gc("collect");
printf("Count #5: %d\n", gc("count"));
%}
-- End --
-- Expect stdout --
Count #1: 6
Count #2: 7
Count #3: 6
Count #4: 7
Count #5: 6
-- End --
Testing enabling the automatic collector.
-- Testcase --
{%
// start GC, trigger every 10 object allocations
gc("start", 10);
for (let i = 0; i < 100; i++) {
let o = {};
o.cyle = o;
o = null;
if ((i % 10) == 0)
printf("Count #%d: %d\n", (i / 10) + 1, gc("count"));
}
// stop GC
gc("stop");
for (let i = 100; i < 200; i++) {
let o = {};
o.cyle = o;
o = null;
if ((i % 10) == 0)
printf("Count #%d: %d\n", (i / 10) + 1, gc("count"));
}
%}
-- End --
-- Expect stdout --
Count #1: 7
Count #2: 14
Count #3: 14
Count #4: 14
Count #5: 14
Count #6: 14
Count #7: 14
Count #8: 14
Count #9: 14
Count #10: 14
Count #11: 14
Count #12: 24
Count #13: 34
Count #14: 44
Count #15: 54
Count #16: 64
Count #17: 74
Count #18: 84
Count #19: 94
Count #20: 104
-- End --
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