mirror of
https://github.com/golang/go
synced 2024-11-06 15:36:24 -07:00
13baf4b2cd
This is a simple tweak to allow a bit more mid-stack inlining.
In cases like this:
func f() {
g()
}
We'd really like to inline f into its callers. It can't hurt.
We implement this optimization by making calls a bit cheaper, enough
to afford a single call in the function body, but not 2.
The remaining budget allows for some argument modification, or perhaps
a wrapping conditional:
func f(x int) {
g(x, 0)
}
func f(x int) {
if x > 0 {
g()
}
}
Update #19348
Change-Id: Ifb1ea0dd1db216c3fd5c453c31c3355561fe406f
Reviewed-on: https://go-review.googlesource.com/c/147361
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: David Chase <drchase@google.com>
291 lines
6.9 KiB
Go
291 lines
6.9 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
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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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// Check correctness of various closure corner cases
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// that are expected to be inlined
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package main
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var ok bool
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var sink int
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func main() {
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{
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if x := func() int { // ERROR "can inline main.func1"
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return 1
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}(); x != 1 { // ERROR "inlining call to main.func1"
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ppanic("x != 1")
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}
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if x := func() int { // ERROR "can inline main.func2" "func literal does not escape"
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return 1
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}; x() != 1 { // ERROR "inlining call to main.func2"
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ppanic("x() != 1")
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}
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}
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{
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if y := func(x int) int { // ERROR "can inline main.func3"
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return x + 2
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}(40); y != 42 { // ERROR "inlining call to main.func3"
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ppanic("y != 42")
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}
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if y := func(x int) int { // ERROR "can inline main.func4" "func literal does not escape"
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return x + 2
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}; y(40) != 42 { // ERROR "inlining call to main.func4"
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ppanic("y(40) != 42")
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}
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}
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{
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y := func(x int) int { // ERROR "can inline main.func5" "func literal does not escape"
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return x + 2
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}
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y = func(x int) int { // ERROR "can inline main.func6" "func literal does not escape"
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return x + 1
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}
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if y(40) != 41 {
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ppanic("y(40) != 41")
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}
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}
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{
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func() { // ERROR "func literal does not escape"
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y := func(x int) int { // ERROR "can inline main.func7.1" "func literal does not escape"
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return x + 2
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}
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y = func(x int) int { // ERROR "can inline main.func7.2" "func literal does not escape"
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return x + 1
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}
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if y(40) != 41 {
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ppanic("y(40) != 41")
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}
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}()
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}
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{
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y := func(x int) int { // ERROR "can inline main.func8" "func literal does not escape"
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return x + 2
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}
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y, sink = func(x int) int { // ERROR "can inline main.func9" "func literal does not escape"
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return x + 1
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}, 42
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if y(40) != 41 {
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ppanic("y(40) != 41")
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}
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}
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{
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func() { // ERROR "func literal does not escape"
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y := func(x int) int { // ERROR "can inline main.func10.1" "func literal does not escape"
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return x + 2
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}
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y, sink = func(x int) int { // ERROR "can inline main.func10.2" "func literal does not escape"
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return x + 1
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}, 42
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if y(40) != 41 {
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ppanic("y(40) != 41")
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}
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}()
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}
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{
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y := func(x int) int { // ERROR "can inline main.func11" "func literal does not escape"
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return x + 2
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}
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y, sink = func() (func(int) int, int) { // ERROR "func literal does not escape"
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return func(x int) int { // ERROR "can inline main.func12" "func literal escapes"
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return x + 1
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}, 42
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}()
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if y(40) != 41 {
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ppanic("y(40) != 41")
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}
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}
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{
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func() { // ERROR "func literal does not escape"
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y := func(x int) int { // ERROR "can inline main.func13.1" "func literal does not escape"
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return x + 2
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}
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y, sink = func() (func(int) int, int) { // ERROR "func literal does not escape"
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return func(x int) int { // ERROR "can inline main.func13.2" "func literal escapes"
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return x + 1
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}, 42
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}()
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if y(40) != 41 {
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ppanic("y(40) != 41")
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}
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}()
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}
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{
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y := func(x int) int { // ERROR "can inline main.func14" "func literal does not escape"
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return x + 2
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}
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y, ok = map[int]func(int) int{ // ERROR "does not escape"
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0: func(x int) int { return x + 1 }, // ERROR "can inline main.func15" "func literal escapes"
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}[0]
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if y(40) != 41 {
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ppanic("y(40) != 41")
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}
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}
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{
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func() { // ERROR "func literal does not escape"
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y := func(x int) int { // ERROR "can inline main.func16.1" "func literal does not escape"
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return x + 2
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}
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y, ok = map[int]func(int) int{ // ERROR "does not escape"
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0: func(x int) int { return x + 1 }, // ERROR "can inline main.func16.2" "func literal escapes"
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}[0]
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if y(40) != 41 {
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ppanic("y(40) != 41")
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}
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}()
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}
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{
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y := func(x int) int { // ERROR "can inline main.func17" "func literal does not escape"
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return x + 2
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}
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y, ok = interface{}(func(x int) int { // ERROR "can inline main.func18" "does not escape"
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return x + 1
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}).(func(int) int)
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if y(40) != 41 {
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ppanic("y(40) != 41")
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}
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}
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{
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func() { // ERROR "func literal does not escape"
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y := func(x int) int { // ERROR "can inline main.func19.1" "func literal does not escape"
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return x + 2
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}
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y, ok = interface{}(func(x int) int { // ERROR "can inline main.func19.2" "does not escape"
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return x + 1
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}).(func(int) int)
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if y(40) != 41 {
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ppanic("y(40) != 41")
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}
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}()
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}
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{
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x := 42
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if y := func() int { // ERROR "can inline main.func20"
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return x
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}(); y != 42 { // ERROR "inlining call to main.func20"
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ppanic("y != 42")
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}
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if y := func() int { // ERROR "can inline main.func21" "func literal does not escape"
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return x
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}; y() != 42 { // ERROR "inlining call to main.func21"
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ppanic("y() != 42")
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}
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}
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{
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x := 42
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if z := func(y int) int { // ERROR "func literal does not escape"
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return func() int { // ERROR "can inline main.func22.1"
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return x + y
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}() // ERROR "inlining call to main.func22.1"
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}(1); z != 43 {
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ppanic("z != 43")
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}
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if z := func(y int) int { // ERROR "func literal does not escape"
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return func() int { // ERROR "can inline main.func23.1"
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return x + y
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}() // ERROR "inlining call to main.func23.1"
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}; z(1) != 43 {
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ppanic("z(1) != 43")
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}
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}
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{
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a := 1
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func() { // ERROR "func literal does not escape"
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func() { // ERROR "can inline main.func24"
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a = 2
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}() // ERROR "inlining call to main.func24" "&a does not escape"
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}()
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if a != 2 {
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ppanic("a != 2")
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}
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}
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{
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b := 2
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func(b int) { // ERROR "func literal does not escape"
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func() { // ERROR "can inline main.func25.1"
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b = 3
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}() // ERROR "inlining call to main.func25.1" "&b does not escape"
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if b != 3 {
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ppanic("b != 3")
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}
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}(b)
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if b != 2 {
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ppanic("b != 2")
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}
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}
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{
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c := 3
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func() { // ERROR "func literal does not escape"
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c = 4
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func() { // ERROR "func literal does not escape"
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if c != 4 {
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ppanic("c != 4")
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}
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for i := 0; i < 10; i++ { // prevent inlining
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}
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}()
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}()
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if c != 4 {
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ppanic("c != 4")
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}
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}
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{
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a := 2
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if r := func(x int) int { // ERROR "func literal does not escape"
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b := 3
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return func(y int) int { // ERROR "func literal does not escape"
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c := 5
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return func(z int) int { // ERROR "can inline main.func27.1.1"
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return a*x + b*y + c*z
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}(10) // ERROR "inlining call to main.func27.1.1"
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}(100)
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}(1000); r != 2350 {
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ppanic("r != 2350")
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}
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}
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{
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a := 2
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if r := func(x int) int { // ERROR "func literal does not escape"
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b := 3
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return func(y int) int { // ERROR "func literal does not escape"
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c := 5
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func(z int) { // ERROR "can inline main.func28.1.1"
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a = a * x
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b = b * y
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c = c * z
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}(10) // ERROR "inlining call to main.func28.1.1" "&a does not escape" "&b does not escape" "&c does not escape"
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return a + c
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}(100) + b
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}(1000); r != 2350 {
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ppanic("r != 2350")
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}
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if a != 2000 {
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ppanic("a != 2000")
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}
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}
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}
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//go:noinline
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func ppanic(s string) { // ERROR "leaking param: s"
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panic(s)
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}
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