garble/testdata/scripts/linkname.txt

env GOGARBLE=test/main,big.chungus/meme

garble build
exec ./main
cmp stderr main.stderr

! binsubstr main$exe 'obfuscatedFunc' 'ObfuscatedFunc'

[short] stop # no need to verify this with -short

go build
exec ./main
cmp stderr main.stderr

-- go.mod --
module test/main

go 1.18

replace big.chungus/meme => ./big.chungus/meme

require (
	big.chungus/meme v0.0.0
)

-- a.go --
package main

// Call a function which is linknamed to another symbol.
// What's special here is that we obfuscate this call before the function declaration.
// If we decide not to obfuscate the name in the function declaration,
// we shouldn't obfuscate the name here either.
func linknameCalledInPkg() {
	println(obfuscatedFunc())
}

-- main.go --
package main

import (
	_ "os/exec"
	_ "strings"
	_ "unsafe"

	_ "big.chungus/meme"
	"test/main/imported"
)

// A linkname to an external non-obfuscated func.
//go:linkname byteIndex strings.IndexByte
func byteIndex(s string, c byte) int

// A linkname to an external non-obfuscated non-exported func.
//go:linkname interfaceEqual os/exec.interfaceEqual
func interfaceEqual(a, b any) bool

// A linkname to an external obfuscated func.
//go:linkname obfuscatedFunc test/main/imported.ObfuscatedFuncImpl
func obfuscatedFunc() string

// A linkname to an entirely made up name, implemented elsewhere.
//go:linkname renamedFunc madeup.newName
func renamedFunc() string

// A linkname to an external non-obfuscated func in another
// module whose package path has a dot in it.
//go:linkname tagline big.chungus/meme.chungify
func tagline() string

func main() {
	println(byteIndex("01234", '3'))
	println(interfaceEqual("Sephiroth", 7))
	println(obfuscatedFunc())
	println(renamedFunc())
	println(tagline())
	println(imported.ByteIndex("01234", '3'))
	linknameCalledInPkg()
}
-- imported/imported.go --
package imported

import (
	_ "unsafe"
)

func ObfuscatedFuncImpl() string {
	return "obfuscated func"
}

//go:linkname renamedFunc madeup.newName
func renamedFunc() string {
	return "renamed func"
}

// A linkname to an external non-obfuscated func.
// Different from byteIndex, as we call this from an importer package.
//go:linkname ByteIndex strings.IndexByte
func ByteIndex(s string, c byte) int
-- big.chungus/meme/go.mod --
module test/main

go 1.18

-- big.chungus/meme/dante.go --
package meme

func chungify() string {
	return "featuring Dante from the Devil May Cry series"
}
-- main.stderr --
3
false
obfuscated func
renamed func
featuring Dante from the Devil May Cry series
3
obfuscated func