eh-test.py

# Copyright David Abrahams 2009. Distributed under the Boost
# Software License, Version 1.0. (See accompanying
# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
import os
import sys

def compile(depth, throw=False, catch=False, exception_spec=False, eh_enabled=True):
    print 'compiling...',
    sys.stdout.flush()
    THROW = throw and '-DTHROW' or ''
    CATCH = catch and '-DCATCH' or ''
    EXCEPTION_SPEC = exception_spec and '-DEXCEPTION_SPEC' or ''
    EH = eh_enabled and '-fexceptions' or '-fno-exceptions'
    depth = depth+10
    os.system('g++-4.4 -ftemplate-depth-%(depth)d -O3 eh-test.cpp -DDEPTH=%(depth)d %(THROW)s %(CATCH)s %(EXCEPTION_SPEC)s %(EH)s -o eh-test' % locals())
    print 'done'
    sys.stdout.flush()

def test(depth, throw=False, catch=False, exception_spec=False, eh_enabled=True):
    compile(depth, throw, catch, exception_spec)
    print 'depth =', depth
    sys.stdout.flush()

    os.system('ls -l ./eh-test')
    os.system('sh -c "time ./eh-test" 2>&1 | grep luser') # warm up cache
    os.system('sh -c "time ./eh-test" 2>&1 | grep user')
    os.system('sh -c "time ./eh-test" 2>&1 | grep user')

    print 20*'-'

for throw,catch,exception_spec,eh_enabled,comment in [
    (False,False,False,False,'EH disabled - should be fastest'),
    (False,False,False,True, 'turn on EH - shows penalty for ability to unwind dtors'),
    (False,True,False,True, 'add a catch block'),
    (False,True,True,True, 'add empty exception specifications'),
    (True,True,False,True, 'remove exception spec and actually throw something')
]:
    print 40*'='
    print comment
    print '; '.join([x+' = %('+x+')s' for x in 'throw', 'catch', 'exception_spec', 'eh_enabled']) % locals()
    print 40*'='
    for exp in range(0,5):
        test(10**exp, throw,catch,exception_spec,eh_enabled);
    sys.stdout.flush()