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