1 files changed, 63 insertions, 0 deletions
diff --git a/test/live_uintptrkeepalive.go b/test/live_uintptrkeepalive.go
new file mode 100644
index 0000000..e39e31f
--- /dev/null
+++ b/test/live_uintptrkeepalive.go
@@ -0,0 +1,63 @@
+// errorcheck -0 -m -live -std
+
+// +build !windows,!js
+
+// Copyright 2015 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 escape analysis and liveness inferred for uintptrkeepalive functions.
+//
+// This behavior is enabled automatically for function declarations with no
+// bodies (assembly, linkname), as well as explicitly on complete functions
+// with //go:uintptrkeepalive.
+//
+// This is most important for syscall.Syscall (and similar functions), so we
+// test it explicitly.
+
+package p
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+func implicit(uintptr) // ERROR "assuming arg#1 is unsafe uintptr"
+
+//go:uintptrkeepalive
+//go:nosplit
+func explicit(uintptr) {
+}
+
+func autotmpImplicit() { // ERROR "can inline autotmpImplicit"
+	var t int
+	implicit(uintptr(unsafe.Pointer(&t))) // ERROR "live at call to implicit: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
+}
+
+func autotmpExplicit() { // ERROR "can inline autotmpExplicit"
+	var t int
+	explicit(uintptr(unsafe.Pointer(&t))) // ERROR "live at call to explicit: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
+}
+
+func autotmpSyscall() { // ERROR "can inline autotmpSyscall"
+	var v int
+	syscall.Syscall(0, 1, uintptr(unsafe.Pointer(&v)), 2) // ERROR "live at call to Syscall: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
+}
+
+func localImplicit() { // ERROR "can inline localImplicit"
+	var t int
+	p := unsafe.Pointer(&t)
+	implicit(uintptr(p))           // ERROR "live at call to implicit: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
+}
+
+func localExplicit() { // ERROR "can inline localExplicit"
+	var t int
+	p := unsafe.Pointer(&t)
+	explicit(uintptr(p))           // ERROR "live at call to explicit: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
+}
+
+func localSyscall() { // ERROR "can inline localSyscall"
+	var v int
+	p := unsafe.Pointer(&v)
+	syscall.Syscall(0, 1, uintptr(p), 2) // ERROR "live at call to Syscall: .?autotmp" "stack object .autotmp_[0-9]+ unsafe.Pointer$"
+}