operand: const types

operand/const.go

@@ -0,0 +1,32 @@
+package operand
+
+import "fmt"
+
+type Constant interface {
+	Op
+	Bytes() int
+	constant()
+}
+
+//go:generate go run make_const.go -output zconst.go
+
+// String is a string constant.
+type String string
+
+func (s String) Asm() string { return fmt.Sprintf("$%q", s) }
+func (s String) Bytes() int  { return len(s) }
+func (s String) constant()   {}
+
+// Imm returns an unsigned integer constant with size guessed from x.
+func Imm(x uint64) Constant {
+	// TODO(mbm): remove this function
+	switch {
+	case uint64(uint8(x)) == x:
+		return U8(x)
+	case uint64(uint16(x)) == x:
+		return U16(x)
+	case uint64(uint32(x)) == x:
+		return U32(x)
+	}
+	return U64(x)
+}