#!/usr/bin/python

'''
Small utility to execute some llvm bitcode.

The use case is a Makefile that builds some executable
and runs it as part of the build process. With emmaken,
the Makefile will generate llvm bitcode, so we can't
just execute it directly. This script will get that
code into a runnable form, and run it.

We cannot just use lli, since code built with debug
symbols will crash it due to

  http://llvm.org/bugs/show_bug.cgi?id=6981

So we must get around that.

To use this, change the Makefile so that instead of
running

  /bin/sh THE_FILE PARAMS

it runs

  python $(EMSCRIPTEN_TOOLS)/exec_llvm.py THE_FILE PARAMS
'''

import os, sys
from subprocess import Popen, PIPE, STDOUT

abspath = os.path.abspath(os.path.dirname(__file__))
def path_from_root(*pathelems):
  return os.path.join(os.path.sep, *(abspath.split(os.sep)[:-1] + list(pathelems)))
exec(open(path_from_root('tools', 'shared.py'), 'r').read())

print '// EXEC_LLVM: ', sys.argv

Popen([LLVM_OPT, sys.argv[1], '-strip-debug', '-o=' + sys.argv[1]+'.clean.bc']).communicate()[0]

# Execute with empty environment - just like the JS script will have
Popen([LLVM_INTERPRETER, sys.argv[1]+'.clean.bc'] + sys.argv[2:], env={'HOME': '.'}).communicate()[0]

#Popen([LLVM_COMPILER, '-march=c', sys.argv[1], '-o=' + sys.argv[1]+'.cbe.c']).communicate()[0]
#Popen(['gcc', sys.argv[1]+'.cbe.c', '-lstdc++']).communicate()[0]
#Popen(['./a.out'] + sys.argv[2:]).communicate()[0]