Added more tests

src/build/arch/x64/Jump_test.go

@@ -0,0 +1,31 @@
+package x64_test
+
+import (
+	"testing"
+
+	"git.akyoto.dev/cli/q/src/build/arch/x64"
+	"git.akyoto.dev/go/assert"
+)
+
+func TestJump8(t *testing.T) {
+	usagePatterns := []struct {
+		Offset int8
+		Code   []byte
+	}{
+		{0, []byte{0xEB, 0x00}},
+		{1, []byte{0xEB, 0x01}},
+		{2, []byte{0xEB, 0x02}},
+		{3, []byte{0xEB, 0x03}},
+		{127, []byte{0xEB, 0x7F}},
+		{-1, []byte{0xEB, 0xFF}},
+		{-2, []byte{0xEB, 0xFE}},
+		{-3, []byte{0xEB, 0xFD}},
+		{-128, []byte{0xEB, 0x80}},
+	}
+
+	for _, pattern := range usagePatterns {
+		t.Logf("jmp %x", pattern.Offset)
+		code := x64.Jump8(nil, pattern.Offset)
+		assert.DeepEqual(t, code, pattern.Code)
+	}
+}

src/build/arch/x64/SizeOf.go

@@ -2,8 +2,8 @@ package x64
 
 import "math"
 
-// sizeOf tells you how many bytes are needed to encode this number.
-func sizeOf(number int) int {
+// SizeOf tells you how many bytes are needed to encode this number.
+func SizeOf(number int) int {
 	switch {
 	case number >= math.MinInt8 && number <= math.MaxInt8:
 		return 1

src/build/arch/x64/SizeOf_test.go

@@ -0,0 +1,21 @@
+package x64_test
+
+import (
+	"math"
+	"testing"
+
+	"git.akyoto.dev/cli/q/src/build/arch/x64"
+	"git.akyoto.dev/go/assert"
+)
+
+func TestSizeOf(t *testing.T) {
+	assert.Equal(t, x64.SizeOf(0), 1)
+	assert.Equal(t, x64.SizeOf(math.MinInt8), 1)
+	assert.Equal(t, x64.SizeOf(math.MaxInt8), 1)
+	assert.Equal(t, x64.SizeOf(math.MinInt16), 2)
+	assert.Equal(t, x64.SizeOf(math.MaxInt16), 2)
+	assert.Equal(t, x64.SizeOf(math.MinInt32), 4)
+	assert.Equal(t, x64.SizeOf(math.MaxInt32), 4)
+	assert.Equal(t, x64.SizeOf(math.MinInt64), 8)
+	assert.Equal(t, x64.SizeOf(math.MaxInt64), 8)
+}

src/build/arch/x64/regRegNum.go

@@ -4,7 +4,7 @@ import "encoding/binary"
 
 // regRegNum encodes an instruction with up to two registers and a number parameter.
 func regRegNum(code []byte, reg byte, rm byte, number int, opCode8 byte, opCode32 byte) []byte {
-	if sizeOf(number) == 1 {
+	if SizeOf(number) == 1 {
 		code = regReg(code, reg, rm, opCode8)
 		return append(code, byte(number))
 	}

src/build/arch/x64/x64_test.go

@@ -8,9 +8,10 @@ import (
 )
 
 func TestX64(t *testing.T) {
-	assert.DeepEqual(t, x64.Call([]byte{}, 1), []byte{0xe8, 0x01, 0x00, 0x00, 0x00})
-	assert.DeepEqual(t, x64.MoveRegisterNumber32([]byte{}, 0, 1), []byte{0xb8, 0x01, 0x00, 0x00, 0x00})
-	assert.DeepEqual(t, x64.MoveRegisterNumber32([]byte{}, 1, 1), []byte{0xb9, 0x01, 0x00, 0x00, 0x00})
-	assert.DeepEqual(t, x64.Return([]byte{}), []byte{0xc3})
-	assert.DeepEqual(t, x64.Syscall([]byte{}), []byte{0x0f, 0x05})
+	assert.DeepEqual(t, x64.Call(nil, 1), []byte{0xe8, 0x01, 0x00, 0x00, 0x00})
+	assert.DeepEqual(t, x64.MoveRegisterNumber32(nil, 0, 1), []byte{0xb8, 0x01, 0x00, 0x00, 0x00})
+	assert.DeepEqual(t, x64.MoveRegisterNumber32(nil, 1, 1), []byte{0xb9, 0x01, 0x00, 0x00, 0x00})
+	assert.DeepEqual(t, x64.Return(nil), []byte{0xc3})
+	assert.DeepEqual(t, x64.Syscall(nil), []byte{0x0f, 0x05})
+	assert.DeepEqual(t, x64.ExtendRAXToRDX(nil), []byte{0x48, 0x99})
 }