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#!/usr/bin/python
'''
Runs csmith, a C fuzzer, and looks for bugs
'''
import os, sys, difflib
from subprocess import Popen, PIPE, STDOUT
sys.path += [os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(__file__))), 'tools')]
import shared
CSMITH = os.path.expanduser('~/Dev/csmith/src/csmith')
CSMITH_CFLAGS = ['-I' + os.path.expanduser('~/Dev/csmith/runtime/')]
filename = os.path.join(shared.CANONICAL_TEMP_DIR, 'fuzzcode')
shared.DEFAULT_TIMEOUT = 3
tried = 0
notes = { 'invalid': 0, 'unaligned': 0 }
while 1:
print 'Tried %d, notes: %s' % (tried, notes)
tried += 1
print '1) Generate C'
shared.execute([CSMITH, '--no-volatiles', '--no-math64', '--max-block-depth', '2', '--max-block-size', '2', '--max-expr-complexity', '2', '--max-funcs', '2'], stdout=open(filename + '.c', 'w'))
print '2) Compile natively'
shared.try_delete(filename)
shared.execute([shared.CLANG_CC, '-O2', filename + '.c', '-o', filename] + CSMITH_CFLAGS, stderr=PIPE)
assert os.path.exists(filename)
print '3) Run natively'
try:
correct = shared.timeout_run(Popen([filename], stdout=PIPE, stderr=PIPE), 3)
except Exception, e:
print 'Failed or infinite looping in native, skipping', e
notes['invalid'] += 1
continue
print '4) Compile JS-ly and compare'
def try_js(args):
shared.try_delete(filename + '.js')
shared.execute([shared.EMCC, '-O2', '-s', 'ASM_JS=1', '-s', 'PRECISE_I64_MATH=1', '-s', 'PRECISE_I32_MUL=1', filename + '.c', '-o', filename + '.js'] + CSMITH_CFLAGS, stderr=PIPE)
assert os.path.exists(filename + '.js')
print '5) Run JS-ly'
js = shared.run_js(filename + '.js', stderr=PIPE) #, engine=...)
assert correct == js, ''.join([a.rstrip()+'\n' for a in difflib.unified_diff(correct.split('\n'), js.split('\n'), fromfile='expected', tofile='actual')])
# Try normally, then try unaligned because csmith does generate nonportable code that requires x86 alignment
ok = False
for args, note in [([], None), (['-s', 'UNALIGNED_MEMORY=1'], 'unaligned')]:
try:
try_js(args)
ok = True
if note:
notes[note] += 1
break
except Exception, e:
print e
if not ok: break
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