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import py, sys
from rpython.jit.codewriter import support
from rpython.jit.codewriter.regalloc import perform_register_allocation
from rpython.jit.codewriter.flatten import flatten_graph, ListOfKind
from rpython.jit.codewriter.format import assert_format
from rpython.jit.metainterp.history import AbstractDescr
from rpython.flowspace.model import Variable, Constant, SpaceOperation
from rpython.flowspace.model import FunctionGraph, Block, Link
from rpython.flowspace.model import c_last_exception
from rpython.rtyper.lltypesystem import lltype, llmemory
from rpython.rtyper import rclass
from rpython.rlib.rarithmetic import ovfcheck
class TestRegAlloc:
def make_graphs(self, func, values):
self.rtyper = support.annotate(func, values)
return self.rtyper.annotator.translator.graphs
def check_assembler(self, graph, expected, transform=False,
callcontrol=None):
# 'transform' can be False only for simple graphs. More complex
# graphs must first be transformed by jtransform.py before they can be
# subjected to register allocation and flattening.
if transform:
from rpython.jit.codewriter.jtransform import transform_graph
transform_graph(graph, callcontrol=callcontrol)
regalloc = perform_register_allocation(graph, 'int')
regalloc2 = perform_register_allocation(graph, 'ref')
ssarepr = flatten_graph(graph, {'int': regalloc,
'ref': regalloc2})
assert_format(ssarepr, expected)
def test_regalloc_simple(self):
def f(a, b):
return a + b
graph = self.make_graphs(f, [5, 6])[0]
regalloc = perform_register_allocation(graph, 'int')
va, vb = graph.startblock.inputargs
vc = graph.startblock.operations[0].result
assert regalloc.getcolor(va) == 0
assert regalloc.getcolor(vb) == 1
assert regalloc.getcolor(vc) == 0
def test_regalloc_void(self):
def f(a, b):
while a > 0:
b += a
a -= 1
return b
graph = self.make_graphs(f, [5, 6])[0]
regalloc = perform_register_allocation(graph, 'float')
# assert did not crash
def test_regalloc_loop(self):
def f(a, b):
while a > 0:
b += a
a -= 1
return b
graph = self.make_graphs(f, [5, 6])[0]
self.check_assembler(graph, """
L1:
int_gt %i0, $0 -> %i2
-live-
goto_if_not %i2, L2
int_add %i1, %i0 -> %i1
int_sub %i0, $1 -> %i0
goto L1
---
L2:
int_return %i1
""")
def test_regalloc_loop_swap(self):
def f(a, b):
while a > 0:
a, b = b, a
return b
graph = self.make_graphs(f, [5, 6])[0]
self.check_assembler(graph, """
L1:
int_gt %i0, $0 -> %i2
-live-
goto_if_not %i2, L2
int_push %i1
int_copy %i0 -> %i1
int_pop -> %i0
goto L1
---
L2:
int_return %i1
""")
def test_regalloc_loop_constant(self):
def f(a, b):
while a > 0:
a, b = b, 2
return b
graph = self.make_graphs(f, [5, 6])[0]
self.check_assembler(graph, """
L1:
int_gt %i0, $0 -> %i0
-live-
goto_if_not %i0, L2
int_copy %i1 -> %i0
int_copy $2 -> %i1
goto L1
---
L2:
int_return %i1
""")
def test_regalloc_cycle(self):
def f(a, b, c):
while a > 0:
a, b, c = b, c, a
return b
graph = self.make_graphs(f, [5, 6, 7])[0]
self.check_assembler(graph, """
L1:
int_gt %i0, $0 -> %i3
-live-
goto_if_not %i3, L2
int_push %i1
int_copy %i2 -> %i1
int_copy %i0 -> %i2
int_pop -> %i0
goto L1
---
L2:
int_return %i1
""")
def test_regalloc_same_as_var(self):
def f(a, b, c):
while a > 0:
b = c
return b
graph = self.make_graphs(f, [5, 6, 7])[0]
self.check_assembler(graph, """
L1:
int_gt %i0, $0 -> %i3
-live-
goto_if_not %i3, L2
int_copy %i2 -> %i1
goto L1
---
L2:
int_return %i1
""")
def test_regalloc_call(self):
v1 = Variable(); v1.concretetype = lltype.Signed
v2 = Variable(); v2.concretetype = lltype.Signed
v3 = Variable(); v3.concretetype = lltype.Signed
v4 = Variable(); v4.concretetype = lltype.Signed
block = Block([v1])
block.operations = [
SpaceOperation('int_add', [v1, Constant(1, lltype.Signed)], v2),
SpaceOperation('rescall', [ListOfKind('int', [v1, v2])], v3),
]
graph = FunctionGraph('f', block, v4)
block.closeblock(Link([v3], graph.returnblock))
#
self.check_assembler(graph, """
int_add %i0, $1 -> %i1
rescall I[%i0, %i1] -> %i0
int_return %i0
""")
def test_regalloc_exitswitch_2(self):
v1 = Variable(); v1.concretetype = rclass.CLASSTYPE
v2 = Variable(); v2.concretetype = rclass.CLASSTYPE
v3 = Variable(); v3.concretetype = rclass.CLASSTYPE
v4 = Variable(); v4.concretetype = rclass.CLASSTYPE
block = Block([])
block.operations = [
SpaceOperation('res_call', [], v1),
SpaceOperation('-live-', [], None),
]
graph = FunctionGraph('f', block, v4)
exclink = Link([v2], graph.returnblock)
exclink.llexitcase = 123 # normally an exception class
exclink.last_exception = v2
exclink.last_exc_value = "unused"
block.exitswitch = c_last_exception
block.closeblock(Link([v1], graph.returnblock),
exclink)
#
self.check_assembler(graph, """
res_call -> %i0
-live-
catch_exception L1
int_return %i0
---
L1:
goto_if_exception_mismatch $123, L2
last_exception -> %i0
int_return %i0
---
L2:
reraise
""")
def test_regalloc_lists(self):
v1 = Variable(); v1.concretetype = lltype.Signed
v2 = Variable(); v2.concretetype = lltype.Signed
v3 = Variable(); v3.concretetype = lltype.Signed
v4 = Variable(); v4.concretetype = lltype.Signed
v5 = Variable(); v5.concretetype = lltype.Signed
block = Block([v1])
block.operations = [
SpaceOperation('int_add', [v1, Constant(1, lltype.Signed)], v2),
SpaceOperation('rescall', [ListOfKind('int', [v1, v2])], v5),
SpaceOperation('rescall', [ListOfKind('int', [v1, v2])], v3),
]
graph = FunctionGraph('f', block, v4)
block.closeblock(Link([v3], graph.returnblock))
#
self.check_assembler(graph, """
int_add %i0, $1 -> %i1
rescall I[%i0, %i1] -> %i2
rescall I[%i0, %i1] -> %i0
int_return %i0
""")
def test_regalloc_bug_1(self):
def _ll_2_int_lshift_ovf(x, y):
result = x << y
if (result >> y) != x:
raise OverflowError
return result
graph = self.make_graphs(_ll_2_int_lshift_ovf, [5, 6])[0]
self.check_assembler(graph, """
int_lshift %i0, %i1 -> %i2
int_rshift %i2, %i1 -> %i1
-live-
goto_if_not_int_ne %i1, %i0, L1
raise $<* struct object>
---
L1:
int_return %i2
""", transform=True)
def test_regalloc_bug_2(self):
class FakeDescr(AbstractDescr):
def __repr__(self):
return '<Descr>'
class FakeCallControl:
def guess_call_kind(self, op):
return 'residual'
def getcalldescr(self, op, **kwds):
return FakeDescr()
def calldescr_canraise(self, calldescr):
return True
class FooError(Exception):
def __init__(self, num):
self.num = num
def g(n):
if n > 100:
raise FooError(n)
return lltype.nullptr(llmemory.GCREF.TO)
def foo(e):
print "hello"
return e
def bar(e):
print "world"
return e
def f(n, kref):
kref2 = bar(kref)
try:
return g(n)
except FooError as e:
if foo(e):
return kref
else:
return kref2
graph = self.make_graphs(f, [5, lltype.nullptr(llmemory.GCREF.TO)])[0]
# this used to produce bogus code, containing these two
# lines in the following broken order:
# last_exc_value -> %r0
# ref_copy %r0 -> %r1 -- but expect to read the old value of %r0!
self.check_assembler(graph, """
residual_call_r_r $<* fn bar>, R[%r0], <Descr> -> %r1
-live-
residual_call_ir_r $<* fn g>, I[%i0], R[], <Descr> -> %r1
-live-
catch_exception L1
ref_return %r1
---
L1:
goto_if_exception_mismatch $<* struct object_vtable>, L2
ref_copy %r0 -> %r1
last_exc_value -> %r0
residual_call_r_r $<* fn foo>, R[%r0], <Descr> -> %r0
-live-
ref_return %r1
---
L2:
reraise
""", transform=True, callcontrol=FakeCallControl())
|
