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import py
from rpython.translator.translator import TranslationContext, graphof
from rpython.translator.simplify import join_blocks
from rpython.translator import exceptiontransform
from rpython.flowspace.model import summary
from rpython.rtyper.llinterp import LLException
from rpython.rtyper.lltypesystem import lltype
from rpython.rtyper.annlowlevel import llhelper
from rpython.rtyper.test.test_llinterp import get_interpreter
from rpython.rlib.objectmodel import llhelper_error_value, dont_inline
from rpython.translator.backendopt.all import backend_optimizations
from rpython.conftest import option
import sys
def check_debug_build():
# the 'not option.view' is because debug builds rarely
# have pygame, so if you want to see the graphs pass --view and
# don't be surprised when the test then passes when it shouldn't.
if not hasattr(sys, 'gettotalrefcount') and not option.view:
py.test.skip("test needs a debug build of Python")
_already_transformed = {}
def interpret(func, values):
interp, graph = get_interpreter(func, values)
t = interp.typer.annotator.translator
if t not in _already_transformed:
etrafo = exceptiontransform.ExceptionTransformer(t)
etrafo.transform_completely()
_already_transformed[t] = True
return interp.eval_graph(graph, values)
class TestExceptionTransform:
def compile(self, fn, inputargs, **kwargs):
from rpython.translator.c.test.test_genc import compile
return compile(fn, inputargs, **kwargs)
def transform_func(self, fn, inputtypes, backendopt=False):
t = TranslationContext()
t.buildannotator().build_types(fn, inputtypes)
t.buildrtyper().specialize()
if option.view:
t.view()
if backendopt:
backend_optimizations(t)
g = graphof(t, fn)
etrafo = exceptiontransform.ExceptionTransformer(t)
etrafo.create_exception_handling(g)
join_blocks(g)
if option.view:
t.view()
return t, g
def test_simple(self):
def one():
return 1
def foo():
one()
return one()
t, g = self.transform_func(foo, [])
assert len(list(g.iterblocks())) == 2 # graph does not change
result = interpret(foo, [])
assert result == 1
f = self.compile(foo, [])
assert f() == 1
def test_passthrough(self):
def one(x):
if x:
raise ValueError()
def foo():
one(0)
one(1)
t, g = self.transform_func(foo, [])
f = self.compile(foo, [])
f(expected_exception_name='ValueError')
def test_catches(self):
def one(x):
if x == 1:
raise ValueError()
elif x == 2:
raise TypeError()
return x - 5
def foo(x):
x = one(x)
try:
x = one(x)
except ValueError:
return 1 + x
except TypeError:
return 2 + x
except:
return 3 + x
return 4 + x
t, g = self.transform_func(foo, [int])
assert len(list(g.iterblocks())) == 10
f = self.compile(foo, [int])
result = interpret(foo, [6])
assert result == 2
result = f(6)
assert result == 2
result = interpret(foo, [7])
assert result == 4
result = f(7)
assert result == 4
result = interpret(foo, [8])
assert result == 2
result = f(8)
assert result == 2
def test_type_checking_catching_does_no_calls(self):
def one(x):
if x == 1:
raise ValueError()
elif x == 2:
raise TypeError()
return x - 5
def foo(x):
x = one(x)
try:
x = one(x)
except ValueError:
return 1 + x
except TypeError:
return 2 + x
except:
return 3 + x
return 4 + x
t, g = self.transform_func(foo, [int])
s = summary(g)
assert s['direct_call'] == 2 # two calls to one, 0 to ll_issubclass
assert s['int_between'] == 2 # subclass checks done directly
def test_bare_except(self):
def one(x):
if x == 1:
raise ValueError()
elif x == 2:
raise TypeError()
return x - 5
def foo(x):
x = one(x)
try:
x = one(x)
except:
return 1 + x
return 4 + x
t, g = self.transform_func(foo, [int])
assert len(list(g.iterblocks())) == 6
f = self.compile(foo, [int])
result = interpret(foo, [6])
assert result == 2
result = f(6)
assert result == 2
result = interpret(foo, [7])
assert result == 3
result = f(7)
assert result == 3
result = interpret(foo, [8])
assert result == 2
result = f(8)
assert result == 2
def test_raises(self):
def foo(x):
if x:
raise ValueError()
t, g = self.transform_func(foo, [int])
assert len(list(g.iterblocks())) == 3
f = self.compile(foo, [int])
f(0)
f(1, expected_exception_name='ValueError')
def test_no_multiple_transform(self):
def f(x):
return x + 1
t = TranslationContext()
t.buildannotator().build_types(f, [int])
t.buildrtyper().specialize()
g = graphof(t, f)
etrafo = exceptiontransform.ExceptionTransformer(t)
etrafo.create_exception_handling(g)
etrafo2 = exceptiontransform.ExceptionTransformer(t)
py.test.raises(AssertionError, etrafo2.create_exception_handling, g)
def test_preserve_can_raise(self):
def f(x):
raise ValueError
t = TranslationContext()
t.buildannotator().build_types(f, [int])
t.buildrtyper().specialize()
g = graphof(t, f)
etrafo = exceptiontransform.ExceptionTransformer(t)
etrafo.create_exception_handling(g)
assert etrafo.raise_analyzer.analyze_direct_call(g)
def test_reraise_is_not_raise(self):
def one(x):
if x == 1:
raise ValueError()
elif x == 2:
raise TypeError()
return x - 5
def foo(x):
try:
return one(x)
except ValueError:
return -42
t, g = self.transform_func(foo, [int])
for block in g.iterblocks():
for op in block.operations:
# the operation 'debug_record_traceback' should only show up
# in a normal raise, not in a reraise
assert op.opname != 'debug_record_traceback'
f = self.compile(foo, [int])
result = interpret(foo, [7])
assert result == 2
result = f(7)
assert result == 2
result = interpret(foo, [1])
assert result == -42
result = f(1)
assert result == -42
def test_needs_keepalive(self):
check_debug_build()
from rpython.rtyper.lltypesystem import lltype
X = lltype.GcStruct("X",
('y', lltype.Struct("Y", ('z', lltype.Signed))))
def can_raise(n):
if n:
raise Exception
else:
return 1
def foo(n):
x = lltype.malloc(X)
y = x.y
y.z = 42
r = can_raise(n)
return r + y.z
f = self.compile(foo, [int])
res = f(0)
assert res == 43
def test_inserting_zeroing_op(self):
from rpython.rtyper.lltypesystem import lltype
S = lltype.GcStruct("S", ('x', lltype.Signed))
def f(x):
s = lltype.malloc(S)
s.x = 0
return s.x
t = TranslationContext()
t.buildannotator().build_types(f, [int])
t.buildrtyper().specialize()
g = graphof(t, f)
etrafo = exceptiontransform.ExceptionTransformer(t)
etrafo.create_exception_handling(g)
ops = dict.fromkeys([o.opname for b, o in g.iterblockops()])
assert 'zero_gc_pointers_inside' in ops
def test_llexternal(self):
from rpython.rtyper.lltypesystem.rffi import llexternal
from rpython.rtyper.lltypesystem import lltype
z = llexternal('z', [lltype.Signed], lltype.Signed)
def f(x):
y = -1
if x > 0:
y = z(x)
return y + x
t,g = self.transform_func(f, [int], True)
# llexternals normally should not raise, the graph should have no exception
# checking
assert summary(g) == {'int_gt': 1, 'int_add': 1, 'direct_call': 1}
def test_get_exception_addr(self):
from rpython.rtyper.lltypesystem import lltype, llmemory
from rpython.rtyper.lltypesystem.lloperation import llop
def foo():
# a bit hard to test, really
a = llop.get_exception_addr(llmemory.Address)
assert lltype.typeOf(a) is llmemory.Address
a = llop.get_exc_value_addr(llmemory.Address)
assert lltype.typeOf(a) is llmemory.Address
return 42
f = self.compile(foo, [])
res = f()
assert res == 42
def test_default_error_value(self):
def foo(x):
if x == 42:
raise ValueError
return 123
result = interpret(foo, [1])
assert result == 123
with py.test.raises(LLException) as exc:
interpret(foo, [42])
assert exc.value.error_value == -1
assert 'ValueError' in str(exc.value)
def test_llhelper_error_value(self):
@llhelper_error_value(-456)
def _foo(x):
if x == 42:
raise ValueError
return x
FN = lltype.Ptr(lltype.FuncType([lltype.Signed], lltype.Signed))
def bar(x):
foo = llhelper(FN, _foo)
return foo(x)
result = interpret(bar, [123])
assert result == 123
with py.test.raises(LLException) as exc:
interpret(bar, [42])
assert exc.value.error_value == -456
assert 'ValueError' in str(exc.value)
#
compiled_foo = self.compile(bar, [int], backendopt=False)
assert compiled_foo(123) == 123
compiled_foo(42, expected_exception_name='ValueError')
def test_enforce_llhelper_error_value_in_case_of_nested_exception(self):
@dont_inline
def my_divide(a, b):
if b == 0:
raise ZeroDivisionError
return a/b
@llhelper_error_value(-456)
def _foo(a, b):
res = my_divide(a, b)
return res
FN = lltype.Ptr(lltype.FuncType([lltype.Signed, lltype.Signed], lltype.Signed))
def bar(a, b):
foo = llhelper(FN, _foo)
return foo(a, b)
result = interpret(bar, [21, 3])
assert result == 7
with py.test.raises(LLException) as exc:
interpret(bar, [21, 0])
assert exc.value.error_value == -456
assert 'ZeroDivisionError' in str(exc.value)
#
compiled_foo = self.compile(bar, [int, int], backendopt=False)
assert compiled_foo(21, 3) == 7
compiled_foo(21, 0, expected_exception_name='ZeroDivisionError')
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