Initial commit: Go 1.23 release state

test/escape_closure.go

@@ -0,0 +1,193 @@
+// 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.
+
+// Test escape analysis for closure arguments.
+
+package escape
+
+var sink interface{}
+
+func ClosureCallArgs0() {
+	x := 0
+	func(p *int) { // ERROR "p does not escape" "func literal does not escape"
+		*p = 1
+	}(&x)
+}
+
+func ClosureCallArgs1() {
+	x := 0
+	for {
+		func(p *int) { // ERROR "p does not escape" "func literal does not escape"
+			*p = 1
+		}(&x)
+	}
+}
+
+func ClosureCallArgs2() {
+	for {
+		x := 0
+		func(p *int) { // ERROR "p does not escape" "func literal does not escape"
+			*p = 1
+		}(&x)
+	}
+}
+
+func ClosureCallArgs3() {
+	x := 0         // ERROR "moved to heap: x"
+	func(p *int) { // ERROR "leaking param: p" "func literal does not escape"
+		sink = p
+	}(&x)
+}
+
+func ClosureCallArgs4() {
+	x := 0
+	_ = func(p *int) *int { // ERROR "leaking param: p to result ~r0" "func literal does not escape"
+		return p
+	}(&x)
+}
+
+func ClosureCallArgs5() {
+	x := 0 // ERROR "moved to heap: x"
+	// TODO(mdempsky): We get "leaking param: p" here because the new escape analysis pass
+	// can tell that p flows directly to sink, but it's a little weird. Re-evaluate.
+	sink = func(p *int) *int { // ERROR "leaking param: p" "func literal does not escape"
+		return p
+	}(&x)
+}
+
+func ClosureCallArgs6() {
+	x := 0         // ERROR "moved to heap: x"
+	func(p *int) { // ERROR "moved to heap: p" "func literal does not escape"
+		sink = &p
+	}(&x)
+}
+
+func ClosureCallArgs7() {
+	var pp *int
+	for {
+		x := 0         // ERROR "moved to heap: x"
+		func(p *int) { // ERROR "leaking param: p" "func literal does not escape"
+			pp = p
+		}(&x)
+	}
+	_ = pp
+}
+
+func ClosureCallArgs8() {
+	x := 0
+	defer func(p *int) { // ERROR "p does not escape" "func literal does not escape"
+		*p = 1
+	}(&x)
+}
+
+func ClosureCallArgs9() {
+	// BAD: x should not leak
+	x := 0 // ERROR "moved to heap: x"
+	for {
+		defer func(p *int) { // ERROR "func literal escapes to heap" "p does not escape"
+			*p = 1
+		}(&x)
+	}
+}
+
+func ClosureCallArgs10() {
+	for {
+		x := 0               // ERROR "moved to heap: x"
+		defer func(p *int) { // ERROR "func literal escapes to heap" "p does not escape"
+			*p = 1
+		}(&x)
+	}
+}
+
+func ClosureCallArgs11() {
+	x := 0               // ERROR "moved to heap: x"
+	defer func(p *int) { // ERROR "leaking param: p" "func literal does not escape"
+		sink = p
+	}(&x)
+}
+
+func ClosureCallArgs12() {
+	x := 0
+	defer func(p *int) *int { // ERROR "leaking param: p to result ~r0" "func literal does not escape"
+		return p
+	}(&x)
+}
+
+func ClosureCallArgs13() {
+	x := 0               // ERROR "moved to heap: x"
+	defer func(p *int) { // ERROR "moved to heap: p" "func literal does not escape"
+		sink = &p
+	}(&x)
+}
+
+func ClosureCallArgs14() {
+	x := 0
+	p := &x
+	_ = func(p **int) *int { // ERROR "leaking param: p to result ~r0 level=1" "func literal does not escape"
+		return *p
+	}(&p)
+}
+
+func ClosureCallArgs15() {
+	x := 0 // ERROR "moved to heap: x"
+	p := &x
+	sink = func(p **int) *int { // ERROR "leaking param content: p" "func literal does not escape"
+		return *p
+	}(&p)
+}
+
+func ClosureLeak1(s string) string { // ERROR "s does not escape"
+	t := s + "YYYY"         // ERROR "escapes to heap"
+	return ClosureLeak1a(t) // ERROR "... argument does not escape"
+}
+
+// See #14409 -- returning part of captured var leaks it.
+func ClosureLeak1a(a ...string) string { // ERROR "leaking param: a to result ~r0 level=1$"
+	return func() string { // ERROR "func literal does not escape"
+		return a[0]
+	}()
+}
+
+func ClosureLeak2(s string) string { // ERROR "s does not escape"
+	t := s + "YYYY"       // ERROR "escapes to heap"
+	c := ClosureLeak2a(t) // ERROR "... argument does not escape"
+	return c
+}
+func ClosureLeak2a(a ...string) string { // ERROR "leaking param content: a"
+	return ClosureLeak2b(func() string { // ERROR "func literal does not escape"
+		return a[0]
+	})
+}
+func ClosureLeak2b(f func() string) string { // ERROR "f does not escape"
+	return f()
+}
+
+func ClosureIndirect() {
+	f := func(p *int) {} // ERROR "p does not escape" "func literal does not escape"
+	f(new(int))          // ERROR "new\(int\) does not escape"
+
+	g := f
+	g(new(int)) // ERROR "new\(int\) does not escape"
+
+	h := nopFunc
+	h(new(int)) // ERROR "new\(int\) does not escape"
+}
+
+func nopFunc(p *int) {} // ERROR "p does not escape"
+
+func ClosureIndirect2() {
+	f := func(p *int) *int { return p } // ERROR "leaking param: p to result ~r0 level=0" "func literal does not escape"
+
+	f(new(int)) // ERROR "new\(int\) does not escape"
+
+	g := f
+	g(new(int)) // ERROR "new\(int\) does not escape"
+
+	h := nopFunc2
+	h(new(int)) // ERROR "new\(int\) does not escape"
+}
+
+func nopFunc2(p *int) *int { return p } // ERROR "leaking param: p to result ~r0 level=0"