riscv-filter.py

#!/usr/bin/env python3
import sys
import tempfile
import subprocess

def main():
    fh_in = sys.stdin
    fh_out = sys.stdout

    while True:
        l = fh_in.readline()
        if not l:
            return 0

        if "x" in l:
            fh_out.write(l)
            fh_out.flush()
            continue
        
        obj_temp = tempfile.NamedTemporaryFile(delete=False, mode='w')
        with tempfile.NamedTemporaryFile(delete=False, mode='w') as asm_temp:
            asm_temp.write(".word 0x%s\n" % l)
            asm_temp.flush()
            subprocess.run(["riscv64-elf-as", "-march=rv32i", "-o", obj_temp.name, asm_temp.name])
            result = subprocess.run(["riscv64-elf-objdump", "-d", obj_temp.name], capture_output=True)
            lastline = result.stdout.splitlines()[-1]
            chunks = lastline.decode().split('\t')

            opcodes = " ".join(chunks[2:])
        
            fh_out.write("%s\n" % opcodes)
            fh_out.flush()


if __name__ == '__main__':
	sys.exit(main())