go source for verification 2026-05-22

test/codegen/zerosize.go

@@ -0,0 +1,44 @@
+// asmcheck
+
+// Copyright 2018 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.
+
+// Make sure a pointer variable and a zero-sized variable
+// aren't allocated to the same stack slot.
+// See issue 24993.
+
+package codegen
+
+func zeroSize() {
+	c := make(chan struct{})
+	// amd64:`MOVQ \$0, command-line-arguments\.s\+56\(SP\)`
+	var s *int
+	// force s to be a stack object, also use some (fixed) stack space
+	g(&s, 1, 2, 3, 4, 5)
+
+	// amd64:`LEAQ command-line-arguments\..*\+55\(SP\)`
+	c <- noliteral(struct{}{})
+}
+
+// Like zeroSize, but without hiding the zero-sized struct.
+func zeroSize2() {
+	c := make(chan struct{})
+	// amd64:`MOVQ \$0, command-line-arguments\.s\+48\(SP\)`
+	var s *int
+	// force s to be a stack object, also use some (fixed) stack space
+	g(&s, 1, 2, 3, 4, 5)
+
+	// amd64:`LEAQ command-line-arguments\..*stmp_\d+\(SB\)`
+	c <- struct{}{}
+}
+
+//go:noinline
+func g(**int, int, int, int, int, int) {}
+
+// noliteral prevents the compiler from recognizing a literal value.
+//
+//go:noinline
+func noliteral[T any](t T) T {
+	return t
+}