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- from test_support import verify, verbose, TestFailed, fcmp
- from string import join
- from random import random, randint
-
- # SHIFT should match the value in longintrepr.h for best testing.
- SHIFT = 15
- BASE = 2 ** SHIFT
- MASK = BASE - 1
-
- # Max number of base BASE digits to use in test cases. Doubling
- # this will at least quadruple the runtime.
- MAXDIGITS = 10
-
- # build some special values
- special = map(long, [0, 1, 2, BASE, BASE >> 1])
- special.append(0x5555555555555555L)
- special.append(0xaaaaaaaaaaaaaaaaL)
- # some solid strings of one bits
- p2 = 4L # 0 and 1 already added
- for i in range(2*SHIFT):
- special.append(p2 - 1)
- p2 = p2 << 1
- del p2
- # add complements & negations
- special = special + map(lambda x: ~x, special) + \
- map(lambda x: -x, special)
-
- # ------------------------------------------------------------ utilities
-
- # Use check instead of assert so the test still does something
- # under -O.
-
- def check(ok, *args):
- if not ok:
- raise TestFailed, join(map(str, args), " ")
-
- # Get quasi-random long consisting of ndigits digits (in base BASE).
- # quasi == the most-significant digit will not be 0, and the number
- # is constructed to contain long strings of 0 and 1 bits. These are
- # more likely than random bits to provoke digit-boundary errors.
- # The sign of the number is also random.
-
- def getran(ndigits):
- verify(ndigits > 0)
- nbits_hi = ndigits * SHIFT
- nbits_lo = nbits_hi - SHIFT + 1
- answer = 0L
- nbits = 0
- r = int(random() * (SHIFT * 2)) | 1 # force 1 bits to start
- while nbits < nbits_lo:
- bits = (r >> 1) + 1
- bits = min(bits, nbits_hi - nbits)
- verify(1 <= bits <= SHIFT)
- nbits = nbits + bits
- answer = answer << bits
- if r & 1:
- answer = answer | ((1 << bits) - 1)
- r = int(random() * (SHIFT * 2))
- verify(nbits_lo <= nbits <= nbits_hi)
- if random() < 0.5:
- answer = -answer
- return answer
-
- # Get random long consisting of ndigits random digits (relative to base
- # BASE). The sign bit is also random.
-
- def getran2(ndigits):
- answer = 0L
- for i in range(ndigits):
- answer = (answer << SHIFT) | randint(0, MASK)
- if random() < 0.5:
- answer = -answer
- return answer
-
- # --------------------------------------------------------------- divmod
-
- def test_division_2(x, y):
- q, r = divmod(x, y)
- q2, r2 = x//y, x%y
- pab, pba = x*y, y*x
- check(pab == pba, "multiplication does not commute for", x, y)
- check(q == q2, "divmod returns different quotient than / for", x, y)
- check(r == r2, "divmod returns different mod than % for", x, y)
- check(x == q*y + r, "x != q*y + r after divmod on", x, y)
- if y > 0:
- check(0 <= r < y, "bad mod from divmod on", x, y)
- else:
- check(y < r <= 0, "bad mod from divmod on", x, y)
-
- def test_division(maxdigits=MAXDIGITS):
- if verbose:
- print "long / * % divmod"
- digits = range(1, maxdigits+1)
- for lenx in digits:
- x = getran(lenx)
- for leny in digits:
- y = getran(leny) or 1L
- test_division_2(x, y)
-
- # -------------------------------------------------------------- ~ & | ^
-
- def test_bitop_identities_1(x):
- check(x & 0 == 0, "x & 0 != 0 for", x)
- check(x | 0 == x, "x | 0 != x for", x)
- check(x ^ 0 == x, "x ^ 0 != x for", x)
- check(x & -1 == x, "x & -1 != x for", x)
- check(x | -1 == -1, "x | -1 != -1 for", x)
- check(x ^ -1 == ~x, "x ^ -1 != ~x for", x)
- check(x == ~~x, "x != ~~x for", x)
- check(x & x == x, "x & x != x for", x)
- check(x | x == x, "x | x != x for", x)
- check(x ^ x == 0, "x ^ x != 0 for", x)
- check(x & ~x == 0, "x & ~x != 0 for", x)
- check(x | ~x == -1, "x | ~x != -1 for", x)
- check(x ^ ~x == -1, "x ^ ~x != -1 for", x)
- check(-x == 1 + ~x == ~(x-1), "not -x == 1 + ~x == ~(x-1) for", x)
- for n in range(2*SHIFT):
- p2 = 2L ** n
- check(x << n >> n == x, "x << n >> n != x for", x, n)
- check(x // p2 == x >> n, "x // p2 != x >> n for x n p2", x, n, p2)
- check(x * p2 == x << n, "x * p2 != x << n for x n p2", x, n, p2)
- check(x & -p2 == x >> n << n == x & ~(p2 - 1),
- "not x & -p2 == x >> n << n == x & ~(p2 - 1) for x n p2",
- x, n, p2)
-
- def test_bitop_identities_2(x, y):
- check(x & y == y & x, "x & y != y & x for", x, y)
- check(x | y == y | x, "x | y != y | x for", x, y)
- check(x ^ y == y ^ x, "x ^ y != y ^ x for", x, y)
- check(x ^ y ^ x == y, "x ^ y ^ x != y for", x, y)
- check(x & y == ~(~x | ~y), "x & y != ~(~x | ~y) for", x, y)
- check(x | y == ~(~x & ~y), "x | y != ~(~x & ~y) for", x, y)
- check(x ^ y == (x | y) & ~(x & y),
- "x ^ y != (x | y) & ~(x & y) for", x, y)
- check(x ^ y == (x & ~y) | (~x & y),
- "x ^ y == (x & ~y) | (~x & y) for", x, y)
- check(x ^ y == (x | y) & (~x | ~y),
- "x ^ y == (x | y) & (~x | ~y) for", x, y)
-
- def test_bitop_identities_3(x, y, z):
- check((x & y) & z == x & (y & z),
- "(x & y) & z != x & (y & z) for", x, y, z)
- check((x | y) | z == x | (y | z),
- "(x | y) | z != x | (y | z) for", x, y, z)
- check((x ^ y) ^ z == x ^ (y ^ z),
- "(x ^ y) ^ z != x ^ (y ^ z) for", x, y, z)
- check(x & (y | z) == (x & y) | (x & z),
- "x & (y | z) != (x & y) | (x & z) for", x, y, z)
- check(x | (y & z) == (x | y) & (x | z),
- "x | (y & z) != (x | y) & (x | z) for", x, y, z)
-
- def test_bitop_identities(maxdigits=MAXDIGITS):
- if verbose:
- print "long bit-operation identities"
- for x in special:
- test_bitop_identities_1(x)
- digits = range(1, maxdigits+1)
- for lenx in digits:
- x = getran(lenx)
- test_bitop_identities_1(x)
- for leny in digits:
- y = getran(leny)
- test_bitop_identities_2(x, y)
- test_bitop_identities_3(x, y, getran((lenx + leny)//2))
-
- # ------------------------------------------------- hex oct repr str atol
-
- def slow_format(x, base):
- if (x, base) == (0, 8):
- # this is an oddball!
- return "0L"
- digits = []
- sign = 0
- if x < 0:
- sign, x = 1, -x
- while x:
- x, r = divmod(x, base)
- digits.append(int(r))
- digits.reverse()
- digits = digits or [0]
- return '-'[:sign] + \
- {8: '0', 10: '', 16: '0x'}[base] + \
- join(map(lambda i: "0123456789ABCDEF"[i], digits), '') + \
- "L"
-
- def test_format_1(x):
- from string import atol
- for base, mapper in (8, oct), (10, repr), (16, hex):
- got = mapper(x)
- expected = slow_format(x, base)
- check(got == expected, mapper.__name__, "returned",
- got, "but expected", expected, "for", x)
- check(atol(got, 0) == x, 'atol("%s", 0) !=' % got, x)
- # str() has to be checked a little differently since there's no
- # trailing "L"
- got = str(x)
- expected = slow_format(x, 10)[:-1]
- check(got == expected, mapper.__name__, "returned",
- got, "but expected", expected, "for", x)
-
- def test_format(maxdigits=MAXDIGITS):
- if verbose:
- print "long str/hex/oct/atol"
- for x in special:
- test_format_1(x)
- for i in range(10):
- for lenx in range(1, maxdigits+1):
- x = getran(lenx)
- test_format_1(x)
-
- # ----------------------------------------------------------------- misc
-
- def test_misc(maxdigits=MAXDIGITS):
- if verbose:
- print "long miscellaneous operations"
- import sys
-
- # check the extremes in int<->long conversion
- hugepos = sys.maxint
- hugeneg = -hugepos - 1
- hugepos_aslong = long(hugepos)
- hugeneg_aslong = long(hugeneg)
- check(hugepos == hugepos_aslong, "long(sys.maxint) != sys.maxint")
- check(hugeneg == hugeneg_aslong,
- "long(-sys.maxint-1) != -sys.maxint-1")
-
- # long -> int should not fail for hugepos_aslong or hugeneg_aslong
- try:
- check(int(hugepos_aslong) == hugepos,
- "converting sys.maxint to long and back to int fails")
- except OverflowError:
- raise TestFailed, "int(long(sys.maxint)) overflowed!"
- try:
- check(int(hugeneg_aslong) == hugeneg,
- "converting -sys.maxint-1 to long and back to int fails")
- except OverflowError:
- raise TestFailed, "int(long(-sys.maxint-1)) overflowed!"
-
- # but long -> int should overflow for hugepos+1 and hugeneg-1
- x = hugepos_aslong + 1
- try:
- int(x)
- raise ValueError
- except OverflowError:
- pass
- except:
- raise TestFailed, "int(long(sys.maxint) + 1) didn't overflow"
-
- x = hugeneg_aslong - 1
- try:
- int(x)
- raise ValueError
- except OverflowError:
- pass
- except:
- raise TestFailed, "int(long(-sys.maxint-1) - 1) didn't overflow"
-
- # ----------------------------------- tests of auto int->long conversion
-
- def test_auto_overflow():
- import math, sys
-
- if verbose:
- print "auto-convert int->long on overflow"
-
- special = [0, 1, 2, 3, sys.maxint-1, sys.maxint, sys.maxint+1]
- sqrt = int(math.sqrt(sys.maxint))
- special.extend([sqrt-1, sqrt, sqrt+1])
- special.extend([-i for i in special])
-
- def checkit(*args):
- # Heavy use of nested scopes here!
- verify(got == expected, "for %r expected %r got %r" %
- (args, expected, got))
-
- for x in special:
- longx = long(x)
-
- expected = -longx
- got = -x
- checkit('-', x)
-
- for y in special:
- longy = long(y)
-
- expected = longx + longy
- got = x + y
- checkit(x, '+', y)
-
- expected = longx - longy
- got = x - y
- checkit(x, '-', y)
-
- expected = longx * longy
- got = x * y
- checkit(x, '*', y)
-
- if y:
- expected = longx / longy
- got = x / y
- checkit(x, '/', y)
-
- expected = longx // longy
- got = x // y
- checkit(x, '//', y)
-
- expected = divmod(longx, longy)
- got = divmod(longx, longy)
- checkit(x, 'divmod', y)
-
- if abs(y) < 5 and not (x == 0 and y < 0):
- expected = longx ** longy
- got = x ** y
- checkit(x, '**', y)
-
- for z in special:
- if z != 0 :
- if y >= 0:
- expected = pow(longx, longy, long(z))
- got = pow(x, y, z)
- checkit('pow', x, y, '%', z)
- else:
- try:
- pow(longx, longy, long(z))
- except TypeError:
- pass
- else:
- raise TestFailed("pow%r should have raised "
- "TypeError" % ((longx, longy, long(z))))
-
- # ---------------------------------------- tests of long->float overflow
-
- def test_float_overflow():
- import math
-
- if verbose:
- print "long->float overflow"
-
- for x in -2.0, -1.0, 0.0, 1.0, 2.0:
- verify(float(long(x)) == x)
-
- huge = 1L << 30000
- mhuge = -huge
- namespace = {'huge': huge, 'mhuge': mhuge, 'math': math}
- for test in ["float(huge)", "float(mhuge)",
- "complex(huge)", "complex(mhuge)",
- "complex(huge, 1)", "complex(mhuge, 1)",
- "complex(1, huge)", "complex(1, mhuge)",
- "1. + huge", "huge + 1.", "1. + mhuge", "mhuge + 1.",
- "1. - huge", "huge - 1.", "1. - mhuge", "mhuge - 1.",
- "1. * huge", "huge * 1.", "1. * mhuge", "mhuge * 1.",
- "1. // huge", "huge // 1.", "1. // mhuge", "mhuge // 1.",
- "1. / huge", "huge / 1.", "1. / mhuge", "mhuge / 1.",
- "1. ** huge", "huge ** 1.", "1. ** mhuge", "mhuge ** 1.",
- "math.sin(huge)", "math.sin(mhuge)",
- "math.sqrt(huge)", "math.sqrt(mhuge)", # should do better
- "math.floor(huge)", "math.floor(mhuge)"]:
-
- try:
- eval(test, namespace)
- except OverflowError:
- pass
- else:
- raise TestFailed("expected OverflowError from %s" % test)
-
- # ---------------------------------------------- test huge log and log10
-
- def test_logs():
- import math
-
- if verbose:
- print "log and log10"
-
- LOG10E = math.log10(math.e)
-
- for exp in range(10) + [100, 1000, 10000]:
- value = 10 ** exp
- log10 = math.log10(value)
- verify(fcmp(log10, exp) == 0)
-
- # log10(value) == exp, so log(value) == log10(value)/log10(e) ==
- # exp/LOG10E
- expected = exp / LOG10E
- log = math.log(value)
- verify(fcmp(log, expected) == 0)
-
- for bad in -(1L << 10000), -2L, 0L:
- try:
- math.log(bad)
- raise TestFailed("expected ValueError from log(<= 0)")
- except ValueError:
- pass
-
- try:
- math.log10(bad)
- raise TestFailed("expected ValueError from log10(<= 0)")
- except ValueError:
- pass
-
- # ---------------------------------------------------------------- do it
-
- test_division()
- test_bitop_identities()
- test_format()
- test_misc()
- test_auto_overflow()
- test_float_overflow()
- test_logs()
-