//go:linkname write

// used by cgo
//go:linkname _cgo_panic_internal
//go:linkname cgoAlwaysFalse
//go:linkname cgoUse
//go:linkname cgoCheckPointer
//go:linkname cgoCheckResult
//go:linkname cgoNoCallback
//go:linkname gobytes
//go:linkname gostringn

// used in plugin
//go:linkname doInit

// used in math/bits
//go:linkname overflowError
//go:linkname divideError

// used in tests
//go:linkname extraMInUse

	}

	*(*slice)(unsafe.Pointer(&b)) = slice{p, size, int(mem / 4)}
	return
}

// used by cmd/cgo
func gobytes(p *byte, n int) (b []byte) {
	if n == 0 {
		return make([]byte, 0)
	}

	if n < 0 || uintptr(n) > maxAlloc {
		panic(errorString("gobytes: length out of range"))
	}

	bp := mallocgc(uintptr(n), nil, false)
	memmove(bp, unsafe.Pointer(p), uintptr(n))

func _Cfunc_GoStringN(p *_Ctype_char, l _Ctype_int) string {
	return _cgo_runtime_gostringn(p, int(l))
}
`

const goBytesDef = `
//go:linkname _cgo_runtime_gobytes runtime.gobytes
func _cgo_runtime_gobytes(unsafe.Pointer, int) []byte

// GoBytes converts the C data p with explicit length l to a Go []byte.
func _Cfunc_GoBytes(p unsafe.Pointer, l _Ctype_int) []byte {
	return _cgo_runtime_gobytes(p, int(l))
}
`

	Name      string
	Got, Want interface{}
}

var testPairs = []testPair{
	{"GoString", C.GoString(C.greeting), greeting},
	{"GoStringN", C.GoStringN(C.greeting, 5), greeting[:5]},
	{"GoBytes", C.GoBytes(unsafe.Pointer(C.greeting), 5), []byte(greeting[:5])},
}

func testHelpers(t *testing.T) {
	for _, pair := range testPairs {
		if !reflect.DeepEqual(pair.Got, pair.Want) {

	// C string to Go string
	func C.GoString(*C.char) string

	// C data with explicit length to Go string
	func C.GoStringN(*C.char, C.int) string

	// C data with explicit length to Go []byte
	func C.GoBytes(unsafe.Pointer, C.int) []byte

As a special case, C.malloc does not call the C library malloc directly
but instead calls a Go helper function that wraps the C library malloc

        def serializer = registry.build(Number)

        expect:
        serialize(123L, serializer) == 123L
        serialize(123, serializer) == 123
        toBytes(123L, serializer).length == toBytes(123L, longSerializer).length + 1
    }

    def "does not write type tag when there is only one matching registered type"() {
        given:
        def registry = new DefaultSerializerRegistry()

        KryoBackedEncoder
    }

    Class<? extends AbstractDecoder> getDecoder() {
        KryoBackedDecoder
    }

    <T> T serialize(T value, Serializer<T> serializer) {
        def bytes = toBytes(value, serializer)
        return fromBytes(bytes, serializer)
    }

    /**
     * Serializes and deserializes the given value, asserting that the generated byte sequence is shorter than it would be when default

import org.gradle.performance.measure.DataAmount
import org.gradle.performance.measure.Duration

import java.math.RoundingMode

@CompileStatic
class PrettyCalculator {

    static String toBytes(Amount<DataAmount> bytes) {
        return bytes.toUnits(DataAmount.BYTES).value.setScale(3, RoundingMode.HALF_UP).stripTrailingZeros().toString() + " B"
    }

    static String toMillis(Amount<Duration> duration) {

    }

    def "uses efficient serialization for Paths"() {
        expect:
        def serializer = factory.getSerializerFor(Path)
        def encoded = toBytes(Paths.get("some-file"), serializer)
        fromBytes(encoded, serializer) == Paths.get("some-file")
        encoded.length == 10
    }

    def "uses efficient serialization for Long"() {
        expect:

		{"IfData.Lastchange", Field, 0},
		{"IfData.Link_state", Field, 0},
		{"IfData.Mclpool", Field, 2},
		{"IfData.Metric", Field, 0},
		{"IfData.Mtu", Field, 0},
		{"IfData.Noproto", Field, 0},
		{"IfData.Obytes", Field, 0},
		{"IfData.Oerrors", Field, 0},
		{"IfData.Omcasts", Field, 0},
		{"IfData.Opackets", Field, 0},
		{"IfData.Pad", Field, 2},
		{"IfData.Pad_cgo_0", Field, 2},