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master
test/maymorestack.go
47 строк
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Austin Clements
cmd/{asm,compile,internal/obj}: add "maymorestack" support
05 ноя 2021, 03:52
05 ноя 2021, 03:52
3839b60
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// run -gcflags=-d=maymorestack=main.mayMoreStack // Copyright 2021 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Test the maymorestack testing hook by injecting a hook that counts // how many times it is called and checking that count. package main import "runtime" var count uint32 //go:nosplit func mayMoreStack() { count++ } func main() { const wantCount = 128 anotherFunc(wantCount - 1) // -1 because the call to main already counted if count == 0 { panic("mayMoreStack not called") } else if count != wantCount { println(count, "!=", wantCount) panic("wrong number of calls to mayMoreStack") } } //go:noinline func anotherFunc(n int) { // Trigger a stack growth on at least some calls to // anotherFunc to test that mayMoreStack is called outside the // morestack loop. It's also important that it is called // before (not after) morestack, but that's hard to test. var x [1 << 10]byte if n > 1 { anotherFunc(n - 1) } runtime.KeepAlive(x) }