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//go:build ignore
package main
import (
"bufio"
"bytes"
"fmt"
"go/format"
"log"
"os"
"strings"
)
type Opcode struct {
Name string
Code string
Args string
Func string
}
func usage() {
os.Stderr.WriteString("gen-opcodes <opcodes-table-path> <opcodes-destination-path>\n\n")
os.Stderr.WriteString("Generates Go file <opcodes-destination-path> from the table file <opcodes-table-path>.\n\n")
os.Exit(1)
}
func main() {
if len(os.Args) != 3 {
usage()
}
fh, err := os.Open(os.Args[1])
if err != nil {
log.Fatal(err)
}
defer fh.Close()
outfh := os.Stdout
if os.Args[2] != "-" {
outfh, err = os.Create(os.Args[2])
if err != nil {
log.Fatal(err)
}
defer outfh.Close()
}
opcodes := []Opcode{}
s := bufio.NewScanner(fh)
for s.Scan() {
line := strings.TrimSpace(s.Text())
if line == "" || strings.HasPrefix(line, "//") {
continue
}
fields := strings.Split(line, "\t")
opcode := Opcode{Name: fields[0], Code: fields[1], Args: fields[2]}
if len(fields) > 3 {
opcode.Func = fields[3]
}
opcodes = append(opcodes, opcode)
}
var buf bytes.Buffer
fmt.Fprintf(&buf, `// Code generated by gen-opcodes. DO NOT EDIT.
// Edit opcodes.table instead.
package op
`)
// constants
fmt.Fprintf(&buf, "const (\n")
for _, opcode := range opcodes {
fmt.Fprintf(&buf, "%s Opcode = %s\n", opcode.Name, opcode.Code)
}
fmt.Fprintf(&buf, ")\n\n")
// name map
fmt.Fprintf(&buf, "var opcodeName = map[Opcode]string{\n")
for _, opcode := range opcodes {
fmt.Fprintf(&buf, "%s: %q,\n", opcode.Name, opcode.Name)
}
fmt.Fprintf(&buf, "}\n")
// arguments map
fmt.Fprintf(&buf, "var opcodeArgs = map[Opcode]string{\n")
for _, opcode := range opcodes {
fmt.Fprintf(&buf, "%s: %s,\n", opcode.Name, opcode.Args)
}
fmt.Fprintf(&buf, "}\n")
// function map
fmt.Fprintf(&buf, "var oplut = map[Opcode]stackfn{\n")
for _, opcode := range opcodes {
if opcode.Func != "" {
fmt.Fprintf(&buf, "%s: %s,\n", opcode.Name, opcode.Func)
}
}
fmt.Fprintf(&buf, "}\n")
src, err := format.Source(buf.Bytes())
if err != nil {
log.Fatal(err)
}
outfh.Write(src)
}
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