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import py
from rpython.rlib.jit import JitDriver, set_param, Counters, set_user_param
from rpython.rlib.jit import unroll_safe, dont_look_inside, promote
from rpython.jit.metainterp.test.support import LLJitMixin
from rpython.jit.metainterp.warmspot import get_stats
from rpython.jit.metainterp.jitprof import Profiler
class TraceLimitTests:
def test_segmented_trace(self):
def p(pc, code):
return "%s %d %s" % (code, pc, code[pc])
myjitdriver = JitDriver(greens=['pc', 'code'], reds=['n'],
get_printable_location=p,
is_recursive=True)
def f(code, n):
pc = 0
while pc < len(code):
myjitdriver.jit_merge_point(n=n, code=code, pc=pc)
op = code[pc]
if op == "-":
n -= 1
elif op == "c":
f('--------------------', n)
elif op == "l":
if n > 0:
myjitdriver.can_enter_jit(n=n, code=code, pc=0)
pc = 0
continue
else:
assert 0
pc += 1
return n
def g(m):
set_param(None, 'inlining', True)
set_param(None, 'trace_limit', 40)
if m > 1000000:
f('', 0)
result = 0
s = '-' * 50 + '-c-l-'
for i in range(m):
result += f(s, i+100)
self.meta_interp(g, [10], backendopt=True, ProfilerClass=Profiler)
stats = get_stats()
self.check_resops(label=1, jump=1, omit_finish=False)
assert stats.metainterp_sd.profiler.counters[
Counters.ABORT_SEGMENTED_TRACE] == 4
self.check_trace_count(7)
self.check_jitcell_token_count(1)
def test_virtualizable(self):
# basically the same test as test_segmented_trace, but the value of n
# is stored in a virtualizable
myjitdriver = JitDriver(greens = [], reds = ['frame'],
virtualizables = ['frame'])
class Frame(object):
_virtualizable_ = ['n']
def __init__(self, n):
self.n = n
def p(pc, code):
return "%s %d %s" % (code, pc, code[pc])
myjitdriver = JitDriver(greens=['pc', 'code'], reds=['frame'],
virtualizables=['frame'],
get_printable_location=p,
is_recursive=True)
def f(code, n):
frame = Frame(n)
pc = 0
while pc < len(code):
myjitdriver.jit_merge_point(frame=frame, code=code, pc=pc)
op = code[pc]
if op == "-":
frame.n -= 1
elif op == "c":
f('--------------------', frame.n)
elif op == "l":
if frame.n > 0:
myjitdriver.can_enter_jit(frame=frame, code=code, pc=0)
pc = 0
continue
else:
assert 0
pc += 1
return frame.n
def g(m):
set_param(None, 'inlining', True)
set_param(None, 'trace_limit', 40)
if m > 1000000:
f('', 0)
result = 0
s = '-' * 50 + '-c-l-'
for i in range(m):
result += f(s, i+100)
self.meta_interp(g, [10], backendopt=True, ProfilerClass=Profiler)
stats = get_stats()
self.check_resops(label=1, jump=1, omit_finish=False)
assert stats.metainterp_sd.profiler.counters[
Counters.ABORT_SEGMENTED_TRACE] == 5
self.check_trace_count(8)
self.check_jitcell_token_count(1)
def test_huge_bridge(self):
def p(pc, code):
return "%s %d %s" % (code, pc, code[pc])
myjitdriver = JitDriver(greens=['pc', 'code'], reds=['n'],
get_printable_location=p,
is_recursive=True)
@unroll_safe
def longtrace(x, n):
for i in range(x):
n -= 1
return n
def f(code, n):
pc = 0
while pc < len(code):
myjitdriver.jit_merge_point(n=n, code=code, pc=pc)
op = code[pc]
if op == "-":
n -= longtrace(3, n)
elif op == "~":
if n > 10:
n -= 1
else:
code = "-" * 50
pc = 0
continue
elif op == "l":
if n > 0:
myjitdriver.can_enter_jit(n=n, code=code, pc=0)
pc = 0
continue
else:
assert 0
pc += 1
return n
def g(m):
set_param(None, 'inlining', True)
set_param(None, 'trace_limit', 40)
if m > 1000000:
f('', 0)
result = 0
s = '~l-'
for i in range(m):
result += f(s, i+100)
# idea of this test: we have a tiny loop that's just compiled
# immediately. then at some point n <= 10 and we switch to "-" * 50.
# That's a huge bridge. The first time we trace that, it doesn't work,
# but then we set the flag on the loop "expect huge bridges", next time
# we make a segmented trace
self.meta_interp(g, [10], backendopt=True, ProfilerClass=Profiler)
stats = get_stats()
assert stats.metainterp_sd.profiler.counters[
Counters.ABORT_SEGMENTED_TRACE] == 2
def test_bug_segmented_trace_makes_no_progress(self):
def p(pc, code):
return "%s %d %s" % (code, pc, code[pc])
myjitdriver = JitDriver(greens=['pc', 'code'], reds=['n'],
get_printable_location=p,
is_recursive=True)
def f(code, n):
pc = 0
while pc < len(code):
myjitdriver.jit_merge_point(n=n, code=code, pc=pc)
op = code[pc]
if op == "-":
if n > 2**30:
print(n) # never taken, the guard is the problem
n -= 1
elif op == "c":
f('--------------------', n)
elif op == "l":
if n > 0:
myjitdriver.can_enter_jit(n=n, code=code, pc=0)
pc = 0
continue
else:
assert 0
pc += 1
return n
def g(m):
set_param(None, 'inlining', True)
set_param(None, 'trace_limit', 40)
if m > 1000000:
f('', 0)
result = 0
s = '-' * 50 + '-c-l-'
for i in range(m):
result += f(s, i+100)
self.meta_interp(g, [10], backendopt=True, ProfilerClass=Profiler)
stats = get_stats()
# the jump is the important instruction, it *must* be there to check
# that the loop was actually closed. before the bug fix we kept adding
# more and more bridges, all for the same bytecode
self.check_resops(label=1, jump=1, omit_finish=False)
assert stats.metainterp_sd.profiler.counters[
Counters.ABORT_SEGMENTED_TRACE] == 8
self.check_trace_count(10)
self.check_jitcell_token_count(1)
def test_huge_tracelimit_raises_exception(self):
def g(i):
f(0)
try:
if i == 0:
set_user_param(None, 'trace_limit=100000')
else:
set_user_param(None, 'trace_limit=1000000000')
except Exception as e:
print e
return False
f(1)
print "about to return True"
return True
myjitdriver = JitDriver(greens=['i'], reds='auto')
def f(i):
# this is unimportant, but stuff complains if theres no JitDriver
a = b = 0
while a < 10:
a += 1
myjitdriver.jit_merge_point(i=i)
return b
res = self.meta_interp(g, [0], backendopt=True, ProfilerClass=Profiler)
assert res
res = self.meta_interp(g, [10], backendopt=True, ProfilerClass=Profiler)
assert not res
class TestLLtype(TraceLimitTests, LLJitMixin):
pass
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