implement the null function for the Mips32 subzero compiler

pydir/run-pnacl-sz.py

 #!/usr/bin/env python2
 
 import argparse
 import itertools
 import os
 import re
 import subprocess
 import sys
 import tempfile
 
 from utils import shellcmd
 
 
 def TargetAssemblerFlags(target):
   # TODO(stichnot): -triple=i686-nacl should be used for a
   # sandboxing test.  This means there should be an args.sandbox
   # argument that also gets passed through to pnacl-sz.
+  # TODO(reed kotler). Need to find out exactly we need to
+  # add here for Mips32.
   flags = { 'x8632': ['-triple=i686'],
-            'arm32': ['-triple=armv7a', '-mcpu=cortex-a9', '-mattr=+neon'] }
+            'arm32': ['-triple=armv7a', '-mcpu=cortex-a9', '-mattr=+neon'],
+            'mips32': ['-triple=mipsel-none-nacl' ] }
   return flags[target]
 
 
 def TargetDisassemblerFlags(target):
   flags = { 'x8632': ['-Mintel'],
-            'arm32': [] }
+            'arm32': [],
+            'mips32':[] }
   return flags[target]
 
 
 def main():
     """Run the pnacl-sz compiler on an llvm file.
 
     Takes an llvm input file, freezes it into a pexe file, converts
     it to a Subzero program, and finally compiles it.
     """
     argparser = argparse.ArgumentParser(
@@ skipping 30 matching lines @@
     argparser.add_argument('--disassemble', required=False,
                            action='store_true',
                            help='Disassemble the assembled output')
     argparser.add_argument('--dis-flags', required=False,
                            action='append', default=[],
                            help='Add a disassembler flag')
     argparser.add_argument('--filetype', default='iasm', dest='filetype',
                            choices=['obj', 'asm', 'iasm'],
                            help='Output file type.  Default %(default)s.')
     argparser.add_argument('--target', default='x8632', dest='target',
-                           choices=['x8632','arm32'],
+                           choices=['x8632','arm32','mips32'],
                            help='Target architecture.  Default %(default)s.')
     argparser.add_argument('--echo-cmd', required=False,
                            action='store_true',
                            help='Trace command that generates ICE instructions')
     argparser.add_argument('--tbc', required=False, action='store_true',
                            help='Input is textual bitcode (not .ll)')
     argparser.add_argument('--expect-fail', required=False, action='store_true',
                            help='Negate success of run by using LLVM not')
     argparser.add_argument('--args', '-a', nargs=argparse.REMAINDER,
                            default=[],
@@ skipping 68 matching lines @@
               [asm_temp.name])
 
     stdout_result = shellcmd(cmd, echo=args.echo_cmd)
     if not args.echo_cmd:
       sys.stdout.write(stdout_result)
     if asm_temp:
       os.remove(asm_temp.name)
 
 if __name__ == '__main__':
     main()