go/test/inline_sync.go

// +build !nacl,!386,!wasm,!arm,!gcflags_noopt
// errorcheck -0 -m

// Copyright 2019 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, using compiler diagnostic flags, that inlining of functions
// imported from the sync package is working.
// Compiles but does not run.

// FIXME: This test is disabled on architectures where atomic operations
// are function calls rather than intrinsics, since this prevents inlining
// of the sync fast paths. This test should be re-enabled once the problem
// is solved.

package foo

import (
	"sync"
)

var mutex *sync.Mutex

func small5() { // ERROR "can inline small5"
	// the Unlock fast path should be inlined
	mutex.Unlock() // ERROR "inlining call to sync\.\(\*Mutex\)\.Unlock" "&sync\.m\.state escapes to heap"
}

func small6() { // ERROR "can inline small6"
	// the Lock fast path should be inlined
	mutex.Lock() // ERROR "inlining call to sync\.\(\*Mutex\)\.Lock" "&sync\.m\.state escapes to heap"
}

var once *sync.Once

func small7() { // ERROR "can inline small7"
        // the Do fast path should be inlined
        once.Do(small5) // ERROR "inlining call to sync\.\(\*Once\)\.Do" "&sync\.o\.done escapes to heap"
}

var rwmutex *sync.RWMutex

func small8() { // ERROR "can inline small8"
        // the RUnlock fast path should be inlined
        rwmutex.RUnlock() // ERROR "inlining call to sync\.\(\*RWMutex\)\.RUnlock" "&sync\.rw\.readerCount escapes to heap"
}

func small9() { // ERROR "can inline small9"
        // the RLock fast path should be inlined
        rwmutex.RLock() // ERROR "inlining call to sync\.\(\*RWMutex\)\.RLock" "&sync\.rw\.readerCount escapes to heap" "&sync\.rw\.readerSem escapes to heap"
}