2015-02-24 10:19:01 -07:00
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// errorcheck -0 -m
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2016-04-10 15:32:26 -06:00
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// Copyright 2015 The Go Authors. All rights reserved.
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2015-02-24 10:19:01 -07:00
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test, using compiler diagnostic flags, that inlining is working.
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// Compiles but does not run.
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package foo
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2017-09-18 15:54:10 -06:00
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import (
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2018-11-04 20:23:08 -07:00
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"runtime"
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2017-09-18 15:54:10 -06:00
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"unsafe"
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)
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2015-02-24 10:19:01 -07:00
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func add2(p *byte, n uintptr) *byte { // ERROR "can inline add2" "leaking param: p to result"
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return (*byte)(add1(unsafe.Pointer(p), n)) // ERROR "inlining call to add1"
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}
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func add1(p unsafe.Pointer, x uintptr) unsafe.Pointer { // ERROR "can inline add1" "leaking param: p to result"
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return unsafe.Pointer(uintptr(p) + x)
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}
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func f(x *byte) *byte { // ERROR "can inline f" "leaking param: x to result"
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return add2(x, 1) // ERROR "inlining call to add2" "inlining call to add1"
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}
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2015-08-24 18:45:59 -06:00
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//go:noinline
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func g(x int) int {
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return x + 1
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}
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func h(x int) int { // ERROR "can inline h"
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return x + 2
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}
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2016-03-16 17:44:17 -06:00
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func i(x int) int { // ERROR "can inline i"
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const y = 2
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return x + y
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}
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2016-03-16 20:29:17 -06:00
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func j(x int) int { // ERROR "can inline j"
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switch {
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case x > 0:
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return x + 2
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default:
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return x + 1
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}
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}
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2020-09-22 03:19:14 -06:00
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func _() int { // ERROR "can inline _"
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tmp1 := h
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tmp2 := tmp1
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return tmp2(0) // ERROR "inlining call to h"
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}
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2020-09-14 20:24:55 -06:00
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var somethingWrong error
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2017-09-18 15:54:10 -06:00
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// local closures can be inlined
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func l(x, y int) (int, int, error) {
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e := func(err error) (int, int, error) { // ERROR "can inline l.func1" "func literal does not escape" "leaking param: err to result"
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return 0, 0, err
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}
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if x == y {
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e(somethingWrong) // ERROR "inlining call to l.func1"
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2020-09-22 03:19:14 -06:00
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} else {
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f := e
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f(nil) // ERROR "inlining call to l.func1"
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2017-09-18 15:54:10 -06:00
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}
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return y, x, nil
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}
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// any re-assignment prevents closure inlining
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func m() int {
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foo := func() int { return 1 } // ERROR "can inline m.func1" "func literal does not escape"
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x := foo()
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foo = func() int { return 2 } // ERROR "can inline m.func2" "func literal does not escape"
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return x + foo()
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}
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// address taking prevents closure inlining
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func n() int {
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foo := func() int { return 1 } // ERROR "can inline n.func1" "func literal does not escape"
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2019-04-01 12:58:33 -06:00
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bar := &foo
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2017-09-18 15:54:10 -06:00
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x := (*bar)() + foo()
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return x
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}
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// make sure assignment inside closure is detected
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func o() int {
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foo := func() int { return 1 } // ERROR "can inline o.func1" "func literal does not escape"
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func(x int) { // ERROR "func literal does not escape"
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if x > 10 {
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foo = func() int { return 2 } // ERROR "can inline o.func2" "func literal escapes"
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}
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}(11)
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return foo()
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}
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func p() int {
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return func() int { return 42 }() // ERROR "can inline p.func1" "inlining call to p.func1"
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}
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2017-10-21 16:58:37 -06:00
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func q(x int) int {
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2019-09-12 11:18:03 -06:00
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foo := func() int { return x * 2 } // ERROR "can inline q.func1" "func literal does not escape"
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2017-10-21 16:58:37 -06:00
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return foo() // ERROR "inlining call to q.func1"
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}
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func r(z int) int {
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2019-09-12 11:18:03 -06:00
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foo := func(x int) int { // ERROR "can inline r.func1" "func literal does not escape"
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2017-10-21 16:58:37 -06:00
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return x + z
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}
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2019-09-12 11:18:03 -06:00
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bar := func(x int) int { // ERROR "func literal does not escape"
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2017-10-21 16:58:37 -06:00
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return x + func(y int) int { // ERROR "can inline r.func2.1"
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return 2*y + x*z
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}(x) // ERROR "inlining call to r.func2.1"
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}
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return foo(42) + bar(42) // ERROR "inlining call to r.func1"
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}
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func s0(x int) int {
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2019-09-12 11:18:03 -06:00
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foo := func() { // ERROR "can inline s0.func1" "func literal does not escape"
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2017-10-21 16:58:37 -06:00
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x = x + 1
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}
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2019-04-01 12:58:33 -06:00
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foo() // ERROR "inlining call to s0.func1"
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2017-10-21 16:58:37 -06:00
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return x
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}
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func s1(x int) int {
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2019-09-12 11:18:03 -06:00
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foo := func() int { // ERROR "can inline s1.func1" "func literal does not escape"
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2017-10-21 16:58:37 -06:00
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return x
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}
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x = x + 1
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2019-04-01 12:58:33 -06:00
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return foo() // ERROR "inlining call to s1.func1"
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2017-10-21 16:58:37 -06:00
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}
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2016-03-16 20:29:17 -06:00
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// can't currently inline functions with a break statement
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func switchBreak(x, y int) int {
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var n int
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switch x {
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case 0:
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n = 1
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Done:
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switch y {
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case 0:
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n += 10
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break Done
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}
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n = 2
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}
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return n
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}
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// can't currently inline functions with a type switch
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2019-09-12 11:18:03 -06:00
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func switchType(x interface{}) int { // ERROR "x does not escape"
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2016-03-16 20:29:17 -06:00
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switch x.(type) {
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case int:
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return x.(int)
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default:
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return 0
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}
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}
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2017-10-10 10:35:11 -06:00
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type T struct{}
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func (T) meth(int, int) {} // ERROR "can inline T.meth"
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func k() (T, int, int) { return T{}, 0, 0 } // ERROR "can inline k"
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func _() { // ERROR "can inline _"
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T.meth(k()) // ERROR "inlining call to k" "inlining call to T.meth"
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}
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2018-11-04 20:23:08 -07:00
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func small1() { // ERROR "can inline small1"
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runtime.GC()
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}
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func small2() int { // ERROR "can inline small2"
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return runtime.GOMAXPROCS(0)
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}
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func small3(t T) { // ERROR "can inline small3"
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t.meth2(3, 5)
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}
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func small4(t T) { // not inlineable - has 2 calls.
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t.meth2(runtime.GOMAXPROCS(0), 5)
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}
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func (T) meth2(int, int) { // not inlineable - has 2 calls.
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runtime.GC()
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runtime.GC()
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}
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2020-03-31 21:24:05 -06:00
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// Issue #29737 - make sure we can do inlining for a chain of recursive functions
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func ee() { // ERROR "can inline ee"
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ff(100) // ERROR "inlining call to ff" "inlining call to gg" "inlining call to hh"
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}
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func ff(x int) { // ERROR "can inline ff"
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if x < 0 {
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return
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}
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gg(x - 1)
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}
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func gg(x int) { // ERROR "can inline gg"
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hh(x - 1)
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}
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func hh(x int) { // ERROR "can inline hh"
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ff(x - 1) // ERROR "inlining call to ff" // ERROR "inlining call to gg"
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}
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2020-09-21 21:20:00 -06:00
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// Issue #14768 - make sure we can inline for loops.
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func for1(fn func() bool) { // ERROR "can inline for1" "fn does not escape"
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for {
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if fn() {
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break
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} else {
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continue
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}
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}
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}
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// BAD: for2 should be inlineable too.
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func for2(fn func() bool) { // ERROR "fn does not escape"
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Loop:
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for {
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if fn() {
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break Loop
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} else {
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continue Loop
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}
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}
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}
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2020-10-19 14:09:55 -06:00
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// Issue #18493 - make sure we can do inlining of functions with a method value
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type T1 struct{}
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func (a T1) meth(val int) int { // ERROR "can inline T1.meth" "inlining call to T1.meth"
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return val + 5
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}
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func getMeth(t1 T1) func(int) int { // ERROR "can inline getMeth"
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return t1.meth // ERROR "t1.meth escapes to heap"
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}
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func ii() { // ERROR "can inline ii"
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var t1 T1
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f := getMeth(t1) // ERROR "inlining call to getMeth" "t1.meth does not escape"
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_ = f(3)
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}
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2020-10-25 12:26:19 -06:00
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// Issue #42194 - make sure that functions evaluated in
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// go and defer statements can be inlined.
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func gd1(int) {
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defer gd1(gd2()) // ERROR "inlining call to gd2"
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defer gd3()() // ERROR "inlining call to gd3"
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go gd1(gd2()) // ERROR "inlining call to gd2"
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go gd3()() // ERROR "inlining call to gd3"
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}
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func gd2() int { // ERROR "can inline gd2"
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return 1
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}
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func gd3() func() { // ERROR "can inline gd3"
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return ii
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}
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