go/test/typeparam/dedup.dir/main.go

// 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.

package main

import (
	"./b"
	"./c"
)

func main() {
	b.B()
	c.C()
}
[dev.typeparams] cmd/compile: put shape types in their own package Put shape types in the top level package called ".shape". Name them using the serialization of the shape name, instead of the .shapeN names. This allows the linker to deduplicate instantiations across packages. Not sure that this is entirely correct, as shapes in this package may reference other packages (e.g. a field of a struct). But it seems to work for now. For the added test, when you look at the resulting binary (use the -k option with run.go) it has only one instantiation of F, and 4 call sites: $ objdump -d a.exe \| grep _a\.F 1053cb0: e8 8b 00 00 00 callq 139 <_a.F[.shape.uint8]> 1053ce9: e8 52 00 00 00 callq 82 <_a.F[.shape.uint8]> _a.F[.shape.uint8]: 1053d90: e8 ab ff ff ff callq -85 <_a.F[.shape.uint8]> 1053dc9: e8 72 ff ff ff callq -142 <_a.F[.shape.*uint8]> Change-Id: I627f7e50210aabe4a10d0e2717d87b75ac82e99b Reviewed-on: https://go-review.googlesource.com/c/go/+/339595 Trust: Keith Randall <khr@golang.org> Trust: Dan Scales <danscales@google.com> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Dan Scales <danscales@google.com> 2021-08-04 02:33:01 +00:00			`// 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.`

			`package main`

			`import (`
test: use dot-relative imports where appropriate Currently, run.go's *dir tests allow "x.go" to be imported interchangeably as either "x" or "./x". This is generally fine, but can cause problems when "x" is the name of a standard library package (e.g., "fixedbugs/bug345.dir/io.go"). This CL is an automated rewrite to change all `import "x"` directives to use `import "./x"` instead. It has no effect today, but will allow subsequent CLs to update test/run.go to resolve "./x" to "test/x" to avoid stdlib collisions. Change-Id: Ic76cd7140e83b47e764f8a499e59936be2b3c876 Reviewed-on: https://go-review.googlesource.com/c/go/+/395116 Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> 2022-03-23 22:09:31 +00:00			`"./b"`
			`"./c"`
[dev.typeparams] cmd/compile: put shape types in their own package Put shape types in the top level package called ".shape". Name them using the serialization of the shape name, instead of the .shapeN names. This allows the linker to deduplicate instantiations across packages. Not sure that this is entirely correct, as shapes in this package may reference other packages (e.g. a field of a struct). But it seems to work for now. For the added test, when you look at the resulting binary (use the -k option with run.go) it has only one instantiation of F, and 4 call sites: $ objdump -d a.exe \| grep _a\.F 1053cb0: e8 8b 00 00 00 callq 139 <_a.F[.shape.uint8]> 1053ce9: e8 52 00 00 00 callq 82 <_a.F[.shape.uint8]> _a.F[.shape.uint8]: 1053d90: e8 ab ff ff ff callq -85 <_a.F[.shape.uint8]> 1053dc9: e8 72 ff ff ff callq -142 <_a.F[.shape.*uint8]> Change-Id: I627f7e50210aabe4a10d0e2717d87b75ac82e99b Reviewed-on: https://go-review.googlesource.com/c/go/+/339595 Trust: Keith Randall <khr@golang.org> Trust: Dan Scales <danscales@google.com> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Dan Scales <danscales@google.com> 2021-08-04 02:33:01 +00:00			`)`

			`func main() {`
			`b.B()`
			`c.C()`
			`}`