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// +build ignore
package main
import (
"bytes"
"flag"
"fmt"
"go/format"
"io"
"log"
"os"
"path/filepath"
"runtime"
"strconv"
)
var output = flag.String("output", "", "path to output file (default stdout)")
func PrintConstType(w io.Writer, name, typ, format string, size int, doc string) {
r := typ[0]
fmt.Fprintf(w, "// %s\n", doc)
fmt.Fprintf(w, "type %s %s\n", name, typ)
fmt.Fprintf(w, "\n")
fmt.Fprintf(w, "func (%c %s) Asm() string { return fmt.Sprintf(\"$%s\", %c) }\n", r, name, format, r)
fmt.Fprintf(w, "func (%c %s) Bytes() int { return %d }\n", r, name, size)
fmt.Fprintf(w, "func (%c %s) constant() {}\n", r, name)
fmt.Fprintf(w, "\n")
}
func PrintConstTypes(w io.Writer) {
_, self, _, _ := runtime.Caller(0)
fmt.Fprintf(w, "// Code generated by %s. DO NOT EDIT.\n\n", filepath.Base(self))
fmt.Fprintf(w, "package operand\n\n")
fmt.Fprintf(w, "import \"fmt\"\n\n")
for n := 1; n <= 8; n *= 2 {
bits := n * 8
bs := strconv.Itoa(bits)
if n >= 4 {
PrintConstType(w, "F"+bs, "float"+bs, "(%#v)", n, fmt.Sprintf("F%d is a %d-bit floating point constant.", bits, bits))
}
PrintConstType(w, "I"+bs, "int"+bs, "%+d", n, fmt.Sprintf("I%d is a %d-bit signed integer constant.", bits, bits))
PrintConstType(w, "U"+bs, "uint"+bs, "%#0"+strconv.Itoa(2*n)+"x", n, fmt.Sprintf("U%d is a %d-bit unsigned integer constant.", bits, bits))
}
}
func main() {
flag.Parse()
w := os.Stdout
if *output != "" {
f, err := os.Create(*output)
if err != nil {
log.Fatal(err)
}
defer f.Close()
w = f
}
buf := bytes.NewBuffer(nil)
PrintConstTypes(buf)
src, err := format.Source(buf.Bytes())
if err != nil {
log.Fatal(err)
}
_, err = w.Write(src)
if err != nil {
log.Fatal(err)
}
}
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