reorganize things into different packages

vm/compiler/wasm_macros.go

@@ -0,0 +1,50 @@
+package compiler
+
+import (
+	"bytes"
+	"encoding/binary"
+)
+
+type WasmMacros struct {
+	data   *bytes.Buffer
+	Labels map[string]int
+}
+
+func NewWasmMacros() *WasmMacros {
+	return &WasmMacros{
+		data:   new(bytes.Buffer),
+		Labels: map[string]int{},
+	}
+}
+
+func (wm *WasmMacros) SetLabel(label string) string {
+	wm.Labels[label] = wm.data.Len()
+	return ""
+}
+
+func (wm *WasmMacros) GetLabel(label string) int {
+	return wm.Labels[label]
+}
+
+func (wm *WasmMacros) DataB(value byte) string {
+	binary.Write(wm.data, binary.LittleEndian, value)
+	return ""
+}
+
+func (wm *WasmMacros) DataW(value uint16) string {
+	binary.Write(wm.data, binary.LittleEndian, value)
+	return ""
+}
+
+func (wm *WasmMacros) DataD(value uint32) string {
+	binary.Write(wm.data, binary.LittleEndian, value)
+	return ""
+}
+
+func (wm *WasmMacros) ToByte(value int) byte {
+	return byte(value)
+}
+
+func (wm *WasmMacros) Data() []byte {
+	return wm.data.Bytes()
+}