| // run |
| |
| //go:build !wasm |
| |
| // Copyright 2021 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. |
| |
| // wasm is excluded because the compiler chatter about register abi pragma ends up |
| // on stdout, and causes the expected output to not match. |
| |
| package main |
| |
| import ( |
| "fmt" |
| ) |
| |
| var sink *string |
| |
| var y int |
| |
| //go:registerparams |
| //go:noinline |
| func F(a, b, c *int) (x int) { |
| x = *a |
| G(&x) |
| x += *b |
| G(&x) |
| x += *c |
| G(&x) |
| return |
| } |
| |
| //go:registerparams |
| //go:noinline |
| func G(x *int) { |
| y += *x |
| fmt.Println("y = ", y) |
| } |
| |
| //go:registerparams |
| //go:noinline |
| func X() { |
| *sink += " !!!!!!!!!!!!!!!" |
| } |
| |
| //go:registerparams |
| //go:noinline |
| func H(s, t string) (result string) { // result leaks to heap |
| result = "Aloha! " + s + " " + t |
| sink = &result |
| r := "" |
| if len(s) <= len(t) { |
| r = "OKAY! " |
| X() |
| } |
| return r + result |
| } |
| |
| //go:registerparams |
| //go:noinline |
| func K(s, t string) (result string) { // result spills |
| result = "Aloha! " + s + " " + t |
| r := "" |
| if len(s) <= len(t) { |
| r = "OKAY! " |
| X() |
| } |
| return r + result |
| } |
| |
| func main() { |
| a, b, c := 1, 4, 16 |
| x := F(&a, &b, &c) |
| fmt.Printf("x = %d\n", x) |
| |
| y := H("Hello", "World!") |
| fmt.Println("len(y) =", len(y)) |
| fmt.Println("y =", y) |
| z := H("Hello", "Pal!") |
| fmt.Println("len(z) =", len(z)) |
| fmt.Println("z =", z) |
| |
| fmt.Println() |
| |
| y = K("Hello", "World!") |
| fmt.Println("len(y) =", len(y)) |
| fmt.Println("y =", y) |
| z = K("Hello", "Pal!") |
| fmt.Println("len(z) =", len(z)) |
| fmt.Println("z =", z) |
| |
| } |