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3f589379ec
This commit rewrites the examples that look for constructor/destructor calls to do so via static variable tracking rather than output parsing. The added ConstructorStats class provides methods to keep track of constructors and destructors, number of default/copy/move constructors, and number of copy/move assignments. It also provides a mechanism for storing values (e.g. for value construction), and then allows all of this to be checked at the end of a test by getting the statistics for a C++ (or python mapping) class. By not relying on the precise pattern of constructions/destructions, but rather simply ensuring that every construction is matched with a destruction on the same object, we ensure that everything that gets created also gets destroyed as expected. This replaces all of the various "std::cout << whatever" code in constructors/destructors with `print_created(this)`/`print_destroyed(this)`/etc. functions which provide similar output, but now has a unified format across the different examples, including a new ### prefix that makes mixed example output and lifecycle events easier to distinguish. With this change, relaxed mode is no longer needed, which enables testing for proper destruction under MSVC, and under any other compiler that generates code calling extra constructors, or optimizes away any constructors. GCC/clang are used as the baseline for move constructors; the tests are adapted to allow more move constructors to be evoked (but other types are constructors much have matching counts). This commit also disables output buffering of tests, as the buffering sometimes results in C++ output ending up in the middle of python output (or vice versa), depending on the OS/python version.
136 lines
3.8 KiB
Python
136 lines
3.8 KiB
Python
#!/usr/bin/env python
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from __future__ import print_function
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import sys
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sys.path.append('.')
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from example import ExampleVirt, runExampleVirt, runExampleVirtVirtual, runExampleVirtBool
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from example import A_Repeat, B_Repeat, C_Repeat, D_Repeat, A_Tpl, B_Tpl, C_Tpl, D_Tpl
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from example import NCVirt, NonCopyable, Movable
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class ExtendedExampleVirt(ExampleVirt):
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def __init__(self, state):
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super(ExtendedExampleVirt, self).__init__(state + 1)
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self.data = "Hello world"
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def run(self, value):
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print('ExtendedExampleVirt::run(%i), calling parent..' % value)
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return super(ExtendedExampleVirt, self).run(value + 1)
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def run_bool(self):
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print('ExtendedExampleVirt::run_bool()')
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return False
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def pure_virtual(self):
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print('ExtendedExampleVirt::pure_virtual(): %s' % self.data)
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ex12 = ExampleVirt(10)
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print(runExampleVirt(ex12, 20))
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try:
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runExampleVirtVirtual(ex12)
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except Exception as e:
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print("Caught expected exception: " + str(e))
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ex12p = ExtendedExampleVirt(10)
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print(runExampleVirt(ex12p, 20))
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print(runExampleVirtBool(ex12p))
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runExampleVirtVirtual(ex12p)
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class VI_AR(A_Repeat):
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def unlucky_number(self):
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return 99
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class VI_AT(A_Tpl):
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def unlucky_number(self):
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return 999
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class VI_CR(C_Repeat):
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def lucky_number(self):
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return C_Repeat.lucky_number(self) + 1.25
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class VI_CT(C_Tpl):
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pass
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class VI_CCR(VI_CR):
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def lucky_number(self):
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return VI_CR.lucky_number(self) * 10
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class VI_CCT(VI_CT):
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def lucky_number(self):
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return VI_CT.lucky_number(self) * 1000
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class VI_DR(D_Repeat):
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def unlucky_number(self):
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return 123
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def lucky_number(self):
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return 42.0
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class VI_DT(D_Tpl):
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def say_something(self, times):
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print("VI_DT says:" + (' quack' * times))
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def unlucky_number(self):
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return 1234
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def lucky_number(self):
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return -4.25
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classes = [
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# A_Repeat, A_Tpl, # abstract (they have a pure virtual unlucky_number)
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VI_AR, VI_AT,
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B_Repeat, B_Tpl,
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C_Repeat, C_Tpl,
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VI_CR, VI_CT, VI_CCR, VI_CCT,
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D_Repeat, D_Tpl, VI_DR, VI_DT
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]
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for cl in classes:
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print("\n%s:" % cl.__name__)
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obj = cl()
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obj.say_something(3)
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print("Unlucky = %d" % obj.unlucky_number())
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if hasattr(obj, "lucky_number"):
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print("Lucky = %.2f" % obj.lucky_number())
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class NCVirtExt(NCVirt):
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def get_noncopyable(self, a, b):
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# Constructs and returns a new instance:
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nc = NonCopyable(a*a, b*b)
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return nc
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def get_movable(self, a, b):
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# Return a referenced copy
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self.movable = Movable(a, b)
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return self.movable
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class NCVirtExt2(NCVirt):
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def get_noncopyable(self, a, b):
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# Keep a reference: this is going to throw an exception
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self.nc = NonCopyable(a, b)
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return self.nc
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def get_movable(self, a, b):
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# Return a new instance without storing it
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return Movable(a, b)
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ncv1 = NCVirtExt()
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print("2^2 * 3^2 =")
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ncv1.print_nc(2, 3)
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print("4 + 5 =")
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ncv1.print_movable(4, 5)
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ncv2 = NCVirtExt2()
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print("7 + 7 =")
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ncv2.print_movable(7, 7)
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try:
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ncv2.print_nc(9, 9)
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print("Something's wrong: exception not raised!")
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except RuntimeError as e:
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# Don't print the exception message here because it differs under debug/non-debug mode
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print("Caught expected exception")
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from example import ConstructorStats
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del ex12
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del ex12p
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del obj
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del ncv1
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del ncv2
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cstats = [ConstructorStats.get(ExampleVirt), ConstructorStats.get(NonCopyable), ConstructorStats.get(Movable)]
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print("Instances not destroyed:", [x.alive() for x in cstats])
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print("Constructor values:", [x.values() for x in cstats])
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print("Copy constructions:", [x.copy_constructions for x in cstats])
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print("Move constructions:", [cstats[i].move_constructions >= 1 for i in range(1, len(cstats))])
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