diff options
| -rwxr-xr-x | scripts/fuzz_opt.py | 76 |
1 files changed, 47 insertions, 29 deletions
diff --git a/scripts/fuzz_opt.py b/scripts/fuzz_opt.py index a429f6920..7fa6a6506 100755 --- a/scripts/fuzz_opt.py +++ b/scripts/fuzz_opt.py @@ -811,6 +811,46 @@ if __name__ == '__main__': # which we use internally) original_wasm = os.path.abspath('original.wasm') shutil.copyfile('a.wasm', original_wasm) + # write out a useful reduce.sh + with open('reduce.sh', 'w') as reduce_sh: + reduce_sh.write('''\ +# check the input is even a valid wasm file +%(wasm_opt)s -all %(temp_wasm)s +echo $? + +# run the command +./scripts/fuzz_opt.py %(seed)d %(temp_wasm)s > o 2> e +echo $? + +# +# You may want to print out part of "o" or "e", if the output matters and not +# just the return code. For example, +# +# cat o | tail -n 10 +# +# would print out the last few lines of stdout, which might be useful if that +# mentions the specific error you want. Make sure that includes the right +# details (sometimes stderr matters too), and preferably no more (less details +# allow more reduction, but raise the risk of it reducing to something you don't +# quite want). +# +# To do a "dry run" of what the reducer will do, copy the original file to the +# test file that this script will run on, +# +# cp %(original_wasm)s %(temp_wasm)s +# +# and then run +# +# bash %(reduce_sh)s +# +# You may also need to add --timeout 5 or such if the testcase is a slow one. +# + ''' % {'wasm_opt': in_bin('wasm-opt'), + 'seed': seed, + 'original_wasm': original_wasm, + 'temp_wasm': os.path.abspath('t.wasm'), + 'reduce_sh': os.path.abspath('reduce.sh')}) + print('''\ ================================================================================ You found a bug! Please report it with @@ -824,51 +864,29 @@ You can run that testcase again with "fuzz_opt.py %(seed)d" The initial wasm file used here is saved as %(original_wasm)s -You can try to reduce the testcase with - - bin/wasm-reduce %(original_wasm)s '--command=bash reduce.sh' -t %(temp_wasm)s -w %(working_wasm)s - -where "reduce.sh" is something like - - # check the input is even a valid wasm file - bin/wasm-opt %(temp_wasm)s - echo $? - - # run the command - ./scripts/fuzz_opt.py %(seed)s %(temp_wasm)s > o 2> e - echo $? - cat o | tail -n 10 - -You may want to adjust what is printed there: in the example we save stdout -and stderr separately and then print (so that wasm-reduce can see it) what we -think is the relevant part of that output. Make sure that includes the right -details (sometimes stderr matters too), and preferably no more (less details -allow more reduction, but raise the risk of it reducing to something you don't -quite want). - -To do a "dry run" of what the reducer will do, copy the original file to the -test file that the script will run on, +You can reduce the testcase by running this now: - cp %(original_wasm)s %(temp_wasm)s -and then run +%(wasm_reduce)s %(original_wasm)s '--command=bash %(reduce_sh)s' -t %(temp_wasm)s -w %(working_wasm)s - bash reduce.sh -You may also need to add --timeout 5 or such if the testcase is a slow one. +"%(reduce_sh)s" has been filled out for you, and includes docs and suggestions. After reduction, the reduced file will be in %(working_wasm)s ================================================================================ ''' % {'seed': seed, 'original_wasm': original_wasm, 'temp_wasm': os.path.abspath('t.wasm'), - 'working_wasm': os.path.abspath('w.wasm')}) + 'working_wasm': os.path.abspath('w.wasm'), + 'wasm_reduce': in_bin('wasm-reduce'), + 'reduce_sh': os.path.abspath('reduce.sh')}) break if given_seed is not None: if given_seed_passed: print('(finished running seed %d without error)' % given_seed) else: print('(finished running seed %d, see error above)' % given_seed) + sys.exit(1) break print('\nInvocations so far:') |