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