code wiki / _hdl_build / nx_gcscope_test.nx

`nx_gcscope_test.nx` source

1// nx_gcscope_test.nx -- SYSTEMATIC hypothesis for the context-dependent jQuery failures: does GC collect a
2// CLOSURE-CAPTURED var under heavy allocation? Sizzle captures `document` in its IIFE scope then allocates
3// massively (matchers, caches) -> if GC doesn't mark closure-captured envs, the var reads undefined at scale.
4import "nx_syscalls.nx"
5import "nx_js_eval.nx"
6func slen(s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} return n }
7func cw(s: *u8) -> i64 { sys_write(1,s,slen(s)); return 0 }
8func run1(label: *u8, js: *u8) -> i64 {
9    js_set_rt_dbg(1)
10    let obx: *i64 = sys_mmap(16) as *i64
11    js_run_source_keep_doc(js, slen(js), 0 as *u8, 0, obx)
12    let genv: *i64 = (obx[1]) as *i64
13    cw(label); cw(": " as *u8)
14    if (genv as i64)==0 { cw("NULL\n" as *u8); return 1 }
15    let ub: *u8 = sys_mmap(2048); let t: i64 = js_pending_total(genv)
16    if t==0 { cw("THREW(no fetch)" as *u8) } else { var i: i64=0; while i<t { let ul: i64=js_pending_url(genv,i,ub,2048); if ul>0 { cw(ub); cw(" " as *u8) } i=i+1 } }
17    cw("\n" as *u8); return 0
18}
19func main() -> i64 {
20    // closure captures `doc`, then allocates 200k objects, then reads doc.createElement through a nested fn.
21    run1("A closure-var vs GC 200k" as *u8, "function mk(){var doc={createElement:function(){return 'EL'}};function a(){return doc.createElement()}var junk=[];var i=0;while(i<200000){junk.push({a:i,b:'s'+i,c:[i,i+1]});i=i+1}return a()}fetch('x/r-'+mk());" as *u8)
22    // top-level var survives heavy alloc?
23    run1("B toplevel-var vs GC   " as *u8, "var keep={createElement:function(){return 'K'}};var j=[];var i=0;while(i<200000){j.push({x:i,y:'z'+i});i=i+1}fetch('x/k-'+(typeof keep)+'-'+(typeof keep.createElement));" as *u8)
24    return 0
25}

nx_gcscope_test.nx source

`nx_gcscope_test.nx` source