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'''
Runs random passes and options on random inputs, using wasm-opt.
Can be configured to run just wasm-opt itself (using --fuzz-exec)
or also run VMs on it.
For afl-fuzz integration, you probably don't want this, and can use
something like
BINARYEN_CORES=1 BINARYEN_PASS_DEBUG=1 afl-fuzz -i afl-testcases/ -o afl-findings/ -m 100 -d -- bin/wasm-opt -ttf --fuzz-exec --Os @@
(that is on a fixed set of arguments to wasm-opt, though - this
script covers different options being passed)
'''
import os
import sys
import difflib
import subprocess
import random
import shutil
import time
# parameters
LOG_LIMIT = 125
INPUT_SIZE_LIMIT = 250 * 1024
def random_size():
return random.randint(1, INPUT_SIZE_LIMIT)
def run(cmd):
print(' '.join(cmd)[:LOG_LIMIT])
return subprocess.check_output(cmd)
def run_unchecked(cmd):
print(' '.join(cmd)[:LOG_LIMIT])
return subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT).communicate()[0]
def randomize_pass_debug():
if random.random() < 0.125:
print('[pass-debug]')
os.environ['BINARYEN_PASS_DEBUG'] = '1'
else:
os.environ['BINARYEN_PASS_DEBUG'] = '0'
del os.environ['BINARYEN_PASS_DEBUG']
def test_one(infile, opts):
def compare(x, y, comment):
if x != y:
message = ''.join([a.rstrip() + '\n' for a in difflib.unified_diff(x.split('\n'), y.split('\n'), fromfile='expected', tofile='actual')])
raise Exception(str(comment) + ": Expected to have '%s' == '%s', diff:\n\n%s" % (
x, y,
message
))
def run_vms(prefix):
def fix_output(out):
# exceptions may differ when optimizing, but an exception should occur. so ignore their types
# also js engines print them out slightly differently
return '\n'.join(map(lambda x: ' *exception*' if 'exception' in x else x, out.split('\n')))
# normalize different vm output
# also the binaryen optimizer can reorder traps (but not remove them), so
# it really just matters if you trap, not how you trap
return out.replace('unreachable executed', 'unreachable') \
.replace('integer result unrepresentable', 'integer overflow') \
.replace('invalid conversion to integer', 'integer overflow') \
.replace('memory access out of bounds', 'index out of bounds') \
.replace('integer divide by zero', 'divide by zero') \
.replace('integer remainder by zero', 'remainder by zero') \
.replace('remainder by zero', 'divide by zero') \
.replace('divide result unrepresentable', 'integer overflow') \
.replace('divide by zero', 'integer overflow') \
.replace('index out of bounds', 'integer overflow') \
.replace('out of bounds memory access', 'integer overflow')
def fix_spec_output(out):
out = fix_output(out)
# spec shows a pointer when it traps, remove that
out = '\n'.join(map(lambda x: x if 'runtime trap' not in x else x[x.find('runtime trap'):], out.split('\n')))
# https://github.com/WebAssembly/spec/issues/543 , float consts are messed up
out = '\n'.join(map(lambda x: x if 'f32' not in x and 'f64' not in x else '', out.split('\n')))
return out
results = []
# append to this list to add results from VMs
# results += [fix_output(run([os.path.expanduser('d8'), '--', prefix + 'js', prefix + 'wasm']))]
# spec has no mechanism to not halt on a trap. so we just check until the first trap, basically
# run(['../spec/interpreter/wasm', prefix + 'wasm'])
# results += [fix_spec_output(run_unchecked(['../spec/interpreter/wasm', prefix + 'wasm', '-e', open(prefix + 'wat').read()]))]
if len(results) == 0:
results = [0]
first = results[0]
for i in range(len(results)):
compare(first, results[i], 'comparing between vms at ' + str(i))
return results
randomize_pass_debug()
bytes = 0
# fuzz vms
# gather VM outputs on input file
run(['bin/wasm-opt', infile, '-ttf', '--emit-js-wrapper=a.js', '--emit-spec-wrapper=a.wat', '-o', 'a.wasm'])
wasm_size = os.stat('a.wasm').st_size
bytes += wasm_size
print('pre js size :', os.stat('a.js').st_size, ' wasm size:', wasm_size)
before = run_vms('a.')
print('----------------')
# gather VM outputs on processed file
run(['bin/wasm-opt', 'a.wasm', '-o', 'b.wasm'] + opts)
wasm_size = os.stat('b.wasm').st_size
bytes += wasm_size
print('post js size:', os.stat('a.js').st_size, ' wasm size:', wasm_size)
shutil.copyfile('a.js', 'b.js')
after = run_vms('b.')
for i in range(len(before)):
compare(before[i], after[i], 'comparing between builds at ' + str(i))
# fuzz binaryen interpreter itself. separate invocation so result is easily fuzzable
run(['bin/wasm-opt', 'a.wasm', '--fuzz-exec', '--fuzz-binary'] + opts)
return bytes
# main
opt_choices = [
[],
['-O1'], ['-O2'], ['-O3'], ['-O4'], ['-Os'], ['-Oz'],
["--coalesce-locals"],
# XXX slow, non-default ["--coalesce-locals-learning"],
["--code-pushing"],
["--code-folding"],
["--const-hoisting"],
["--dae"],
["--dae-optimizing"],
["--dce"],
["--flatten", "--dfo"],
["--duplicate-function-elimination"],
["--flatten"],
# ["--fpcast-emu"], # removes indirect call failures as it makes them go through regardless of type
["--inlining"],
["--inlining-optimizing"],
["--flatten", "--local-cse"],
["--generate-stack-ir"],
["--licm"],
["--memory-packing"],
["--merge-blocks"],
['--merge-locals'],
["--optimize-instructions"],
["--optimize-stack-ir"],
["--generate-stack-ir", "--optimize-stack-ir"],
["--pick-load-signs"],
["--precompute"],
["--precompute-propagate"],
["--remove-unused-brs"],
["--remove-unused-nonfunction-module-elements"],
["--remove-unused-module-elements"],
["--remove-unused-names"],
["--reorder-functions"],
["--reorder-locals"],
["--flatten", "--rereloop"],
["--rse"],
["--simplify-locals"],
["--simplify-locals-nonesting"],
["--simplify-locals-nostructure"],
["--simplify-locals-notee"],
["--simplify-locals-notee-nostructure"],
["--ssa"],
["--vacuum"],
]
def get_multiple_opt_choices():
ret = []
# core opts
while 1:
ret += random.choice(opt_choices)
if len(ret) > 20 or random.random() < 0.3:
break
# modifiers (if not already implied by a -O? option)
if '-O' not in str(ret):
if random.random() < 0.5:
ret += ['--optimize-level=' + str(random.randint(0, 3))]
if random.random() < 0.5:
ret += ['--shrink-level=' + str(random.randint(0, 3))]
return ret
# main
if len(sys.argv) >= 2:
print('checking given input')
if len(sys.argv) >= 3:
test_one(sys.argv[1], sys.argv[2:])
else:
for opts in opt_choices:
print(opts)
test_one(sys.argv[1], opts)
else:
print('checking infinite random inputs')
random.seed(time.time())
temp = 'input.dat'
counter = 0
bytes = 0 # wasm bytes tested
start_time = time.time()
while True:
counter += 1
f = open(temp, 'w')
size = random_size()
print('\nITERATION:', counter, 'size:', size, 'speed:', counter / (time.time() - start_time), 'iters/sec, ', bytes / (time.time() - start_time), 'bytes/sec\n')
for x in range(size):
f.write(chr(random.randint(0, 255)))
f.close()
opts = get_multiple_opt_choices()
print('opts:', ' '.join(opts))
bytes += test_one('input.dat', opts)
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