77 lines
1.7 KiB
V
77 lines
1.7 KiB
V
// vtest retry: 4
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/*
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* To verify the effect of "[keep_args_alive]", this attribute may be commented out.
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* However it is not guaranteed that then this test will fail.
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* To provoke a failure it seems to be best to use `gcc` with optimization:
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* `gcc -gc boehm -cc gcc-9 -prod test keep_args_alive_test.v`.
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* Without optimization, pointer variables may remain on the stack even if
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* not used any more.
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*/
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import rand
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import sync
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#flag -I@VEXEROOT/vlib/v/tests
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#include "keep_args_alive_test_c.h"
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fn C.atomic_load_ptr(voidptr) voidptr
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fn C.atomic_store_ptr(voidptr, voidptr)
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[keep_args_alive]
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fn C.calc_expr_after_delay(voidptr, int, voidptr) int
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fn set_vals() voidptr {
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unsafe {
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p := &int(malloc(8000000))
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q := &int(malloc(8000000))
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aa := p + 769345
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*aa = -4578
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bb := q + 572397
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*bb = 793254
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p = &int(0)
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q = &int(0)
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r := &voidptr(malloc(1000000))
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r[456] = aa
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r[7932] = bb
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aa = &int(0)
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bb = &int(0)
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return r
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}
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}
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fn tt(mut sem sync.Semaphore) int {
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waste_mem(10000, mut sem)
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r := &voidptr(set_vals())
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g := unsafe { C.calc_expr_after_delay(r[456], 12, r[7932]) }
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return g
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}
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fn waste_mem(n int, mut sem sync.Semaphore) {
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mut m := []voidptr{len: 30}
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for j := 0; n < 0 || j < n; j++ {
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i := rand.intn(30) or { 0 }
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m[i] = unsafe { malloc(10000) }
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fill := rand.intn(256) or { 0 }
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unsafe { C.memset(m[i], fill, 10000) }
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if n < 0 && sem.try_wait() {
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break
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}
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}
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}
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fn test_keep_args_alive_attribute() {
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mut sem := sync.new_semaphore()
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$if gcboehm ? {
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go waste_mem(-1, mut sem)
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go waste_mem(-1, mut sem)
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waste_mem(10000, mut sem)
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}
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r := &voidptr(set_vals())
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v := unsafe { C.calc_expr_after_delay(r[456], 12, r[7932]) }
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$if gcboehm ? {
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sem.post()
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sem.post()
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}
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assert v == 738318
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}
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