1// errorcheck -0 -m -live -std
2
3//go:build !windows && !js && !wasip1
4
5// Copyright 2015 The Go Authors. All rights reserved.
6// Use of this source code is governed by a BSD-style
7// license that can be found in the LICENSE file.
8
9// Test escape analysis and liveness inferred for uintptrkeepalive functions.
10//
11// This behavior is enabled automatically for function declarations with no
12// bodies (assembly, linkname), as well as explicitly on complete functions
13// with //go:uintptrkeepalive.
14//
15// This is most important for syscall.Syscall (and similar functions), so we
16// test it explicitly.
17
18package p
19
20import (
21	"syscall"
22	"unsafe"
23)
24
25func implicit(uintptr) // ERROR "assuming ~p0 is unsafe uintptr"
26
27//go:uintptrkeepalive
28//go:nosplit
29func explicit(uintptr) {
30}
31
32func autotmpImplicit() { // ERROR "can inline autotmpImplicit"
33	var t int
34	implicit(uintptr(unsafe.Pointer(&t))) // ERROR "live at call to implicit: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
35}
36
37func autotmpExplicit() { // ERROR "can inline autotmpExplicit"
38	var t int
39	explicit(uintptr(unsafe.Pointer(&t))) // ERROR "live at call to explicit: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
40}
41
42func autotmpSyscall() { // ERROR "can inline autotmpSyscall"
43	var v int
44	syscall.Syscall(0, 1, uintptr(unsafe.Pointer(&v)), 2) // ERROR "live at call to Syscall: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
45}
46
47func localImplicit() { // ERROR "can inline localImplicit"
48	var t int
49	p := unsafe.Pointer(&t)
50	implicit(uintptr(p)) // ERROR "live at call to implicit: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
51}
52
53func localExplicit() { // ERROR "can inline localExplicit"
54	var t int
55	p := unsafe.Pointer(&t)
56	explicit(uintptr(p)) // ERROR "live at call to explicit: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
57}
58
59func localSyscall() { // ERROR "can inline localSyscall"
60	var v int
61	p := unsafe.Pointer(&v)
62	syscall.Syscall(0, 1, uintptr(p), 2) // ERROR "live at call to Syscall: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
63}
64