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// errorcheck -0 -m
// 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, using compiler diagnostic flags, that inlining is working.
// Compiles but does not run.
package foo
import (
"runtime"
"unsafe"
)
func add2(p *byte, n uintptr) *byte { // ERROR "can inline add2" "leaking param: p to result"
return (*byte)(add1(unsafe.Pointer(p), n)) // ERROR "inlining call to add1"
}
func add1(p unsafe.Pointer, x uintptr) unsafe.Pointer { // ERROR "can inline add1" "leaking param: p to result"
return unsafe.Pointer(uintptr(p) + x)
}
func f(x *byte) *byte { // ERROR "can inline f" "leaking param: x to result"
return add2(x, 1) // ERROR "inlining call to add2" "inlining call to add1"
}
//go:noinline
func g(x int) int {
return x + 1
}
func h(x int) int { // ERROR "can inline h"
return x + 2
}
func i(x int) int { // ERROR "can inline i"
const y = 2
return x + y
}
func j(x int) int { // ERROR "can inline j"
switch {
case x > 0:
return x + 2
default:
return x + 1
}
}
func _() int { // ERROR "can inline _"
tmp1 := h
tmp2 := tmp1
return tmp2(0) // ERROR "inlining call to h"
}
var somethingWrong error
// local closures can be inlined
func l(x, y int) (int, int, error) {
e := func(err error) (int, int, error) { // ERROR "can inline l.func1" "func literal does not escape" "leaking param: err to result"
return 0, 0, err
}
if x == y {
e(somethingWrong) // ERROR "inlining call to l.func1"
} else {
f := e
f(nil) // ERROR "inlining call to l.func1"
}
return y, x, nil
}
// any re-assignment prevents closure inlining
func m() int {
foo := func() int { return 1 } // ERROR "can inline m.func1" "func literal does not escape"
x := foo()
foo = func() int { return 2 } // ERROR "can inline m.func2" "func literal does not escape"
return x + foo()
}
// address taking prevents closure inlining
func n() int {
foo := func() int { return 1 } // ERROR "can inline n.func1" "func literal does not escape"
bar := &foo
x := (*bar)() + foo()
return x
}
// make sure assignment inside closure is detected
func o() int {
foo := func() int { return 1 } // ERROR "can inline o.func1" "func literal does not escape"
func(x int) { // ERROR "func literal does not escape"
if x > 10 {
foo = func() int { return 2 } // ERROR "can inline o.func2" "func literal escapes"
}
}(11)
return foo()
}
func p() int {
return func() int { return 42 }() // ERROR "can inline p.func1" "inlining call to p.func1"
}
func q(x int) int {
foo := func() int { return x * 2 } // ERROR "can inline q.func1" "func literal does not escape"
return foo() // ERROR "inlining call to q.func1"
}
func r(z int) int {
foo := func(x int) int { // ERROR "can inline r.func1" "func literal does not escape"
return x + z
}
bar := func(x int) int { // ERROR "func literal does not escape"
return x + func(y int) int { // ERROR "can inline r.func2.1"
return 2*y + x*z
}(x) // ERROR "inlining call to r.func2.1"
}
return foo(42) + bar(42) // ERROR "inlining call to r.func1"
}
func s0(x int) int {
foo := func() { // ERROR "can inline s0.func1" "func literal does not escape"
x = x + 1
}
foo() // ERROR "inlining call to s0.func1"
return x
}
func s1(x int) int {
foo := func() int { // ERROR "can inline s1.func1" "func literal does not escape"
return x
}
x = x + 1
return foo() // ERROR "inlining call to s1.func1"
}
// can't currently inline functions with a break statement
func switchBreak(x, y int) int {
var n int
switch x {
case 0:
n = 1
Done:
switch y {
case 0:
n += 10
break Done
}
n = 2
}
return n
}
// can't currently inline functions with a type switch
func switchType(x interface{}) int { // ERROR "x does not escape"
switch x.(type) {
case int:
return x.(int)
default:
return 0
}
}
type T struct{}
func (T) meth(int, int) {} // ERROR "can inline T.meth"
func k() (T, int, int) { return T{}, 0, 0 } // ERROR "can inline k"
func _() { // ERROR "can inline _"
T.meth(k()) // ERROR "inlining call to k" "inlining call to T.meth"
}
func small1() { // ERROR "can inline small1"
runtime.GC()
}
func small2() int { // ERROR "can inline small2"
return runtime.GOMAXPROCS(0)
}
func small3(t T) { // ERROR "can inline small3"
t.meth2(3, 5)
}
func small4(t T) { // not inlineable - has 2 calls.
t.meth2(runtime.GOMAXPROCS(0), 5)
}
func (T) meth2(int, int) { // not inlineable - has 2 calls.
runtime.GC()
runtime.GC()
}
// Issue #29737 - make sure we can do inlining for a chain of recursive functions
func ee() { // ERROR "can inline ee"
ff(100) // ERROR "inlining call to ff" "inlining call to gg" "inlining call to hh"
}
func ff(x int) { // ERROR "can inline ff"
if x < 0 {
return
}
gg(x - 1)
}
func gg(x int) { // ERROR "can inline gg"
hh(x - 1)
}
func hh(x int) { // ERROR "can inline hh"
ff(x - 1) // ERROR "inlining call to ff" // ERROR "inlining call to gg"
}
// Issue #14768 - make sure we can inline for loops.
func for1(fn func() bool) { // ERROR "can inline for1" "fn does not escape"
for {
if fn() {
break
} else {
continue
}
}
}
// BAD: for2 should be inlineable too.
func for2(fn func() bool) { // ERROR "fn does not escape"
Loop:
for {
if fn() {
break Loop
} else {
continue Loop
}
}
}
// Issue #18493 - make sure we can do inlining of functions with a method value
type T1 struct{}
func (a T1) meth(val int) int { // ERROR "can inline T1.meth" "inlining call to T1.meth"
return val + 5
}
func getMeth(t1 T1) func(int) int { // ERROR "can inline getMeth"
return t1.meth // ERROR "t1.meth escapes to heap"
}
func ii() { // ERROR "can inline ii"
var t1 T1
f := getMeth(t1) // ERROR "inlining call to getMeth" "t1.meth does not escape"
_ = f(3)
}
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