Initial commit: Go 1.23 release state

test/fixedbugs/issue12588.go

@@ -0,0 +1,88 @@
+// errorcheck -0 -m -l
+
+// 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.
+
+// Tests escape analysis for range of arrays.
+// Compiles but need not run.  Inlining is disabled.
+
+package main
+
+type A struct {
+	b [3]uint64
+}
+
+type B struct {
+	b [3]*uint64
+}
+
+func f(a A) int {
+	for i, x := range &a.b {
+		if x != 0 {
+			return 64*i + int(x)
+		}
+	}
+	return 0
+}
+
+func g(a *A) int { // ERROR "a does not escape"
+	for i, x := range &a.b {
+		if x != 0 {
+			return 64*i + int(x)
+		}
+	}
+	return 0
+}
+
+func h(a *B) *uint64 { // ERROR "leaking param: a to result ~r0 level=1"
+	for i, x := range &a.b {
+		if i == 0 {
+			return x
+		}
+	}
+	return nil
+}
+
+func h2(a *B) *uint64 { // ERROR "leaking param: a to result ~r0 level=1"
+	p := &a.b
+	for i, x := range p {
+		if i == 0 {
+			return x
+		}
+	}
+	return nil
+}
+
+// Seems like below should be level=1, not 0.
+func k(a B) *uint64 { // ERROR "leaking param: a to result ~r0 level=0"
+	for i, x := range &a.b {
+		if i == 0 {
+			return x
+		}
+	}
+	return nil
+}
+
+var sink *uint64
+
+func main() {
+	var a1, a2 A
+	var b1, b2, b3, b4 B
+	var x1, x2, x3, x4 uint64 // ERROR "moved to heap: x1" "moved to heap: x3"
+	b1.b[0] = &x1
+	b2.b[0] = &x2
+	b3.b[0] = &x3
+	b4.b[0] = &x4
+	f(a1)
+	g(&a2)
+	sink = h(&b1)
+	h(&b2)
+	sink = h2(&b1)
+	h2(&b4)
+	x1 = 17
+	println("*sink=", *sink) // Verify that sink addresses x1
+	x3 = 42
+	sink = k(b3)
+	println("*sink=", *sink) // Verify that sink addresses x3
+}