garble/testdata/script/ctrlflow.txtar

env GARBLE_EXPERIMENTAL_CONTROLFLOW=1
exec garble -literals -debugdir=debug -seed=0002deadbeef build -o=main$exe

stderr '"test/main.func1" function has no effect on the resulting binary'

exec ./main
cmp stderr main.stderr

# simple check to ensure that control flow will work. Must be a minimum of 10 goto's
grep 'goto _s2a_l10' $WORK/debug/test/main/GARBLE_controlflow.go

# obfuscated function must be removed from original file
! grep 'main\(\)' $WORK/debug/test/main/garble_main.go
# original file must contains empty function
grep '\_\(\)' $WORK/debug/test/main/garble_main.go

# switch must be simplified
! grep switch $WORK/debug/test/main/GARBLE_controlflow.go

# obfuscated file must contains interface for unexported interface emulation
grep 'GoString\(\) string' $WORK/debug/test/main/GARBLE_controlflow.go
grep 'String\(\) string' $WORK/debug/test/main/GARBLE_controlflow.go

# control flow obfuscation should work correctly with literals obfuscation
! binsubstr main$exe 'correct name'

-- go.mod --
module test/main

go 1.20
-- garble_main.go --
package main

import (
	"encoding/binary"
	"encoding/hex"
	"hash/crc32"
)

//garble:controlflow flatten_passes=0 junk_jumps=max block_splits=max
func func1() {}

//garble:controlflow flatten_passes=1 junk_jumps=10 block_splits=10
func main() {
	// Reference to the unexported interface triggers creation of a new interface
	// with a list of all functions of the private interface
	endian := binary.LittleEndian
	println(endian.String())
	println(endian.GoString())
	println(endian.Uint16([]byte{0, 1}))

	// Switch statement should be simplified to if statements
	switch endian.String() {
	case "LittleEndian":
		println("correct name")
	default:
		panic("unreachable")
	}

	// Indirect import "hash" package
	hash := crc32.New(crc32.IEEETable)
	hash.Write([]byte("1"))
	hash.Write([]byte("2"))
	hash.Write([]byte("3"))

	println(hex.EncodeToString(hash.Sum(nil)))
}

-- main.stderr --
LittleEndian
binary.LittleEndian
256
correct name
884863d2