Author: Armin Rigo <[email protected]>
Branch:
Changeset: r52991:e6f349cd4a97
Date: 2012-02-28 17:13 +0100
http://bitbucket.org/pypy/pypy/changeset/e6f349cd4a97/
Log: Phew. A passing test checking that gc pointers are correctly saved
and correctly restored around CALL_MALLOC_NURSERY.
diff --git a/pypy/jit/backend/x86/test/test_gc_integration.py
b/pypy/jit/backend/x86/test/test_gc_integration.py
--- a/pypy/jit/backend/x86/test/test_gc_integration.py
+++ b/pypy/jit/backend/x86/test/test_gc_integration.py
@@ -184,6 +184,8 @@
self.addrs[1] = self.addrs[0] + 64
self.calls = []
def malloc_slowpath(size):
+ if self.gcrootmap is not None: # hook
+ self.gcrootmap.hook_malloc_slowpath()
self.calls.append(size)
# reset the nursery
nadr = rffi.cast(lltype.Signed, self.nursery)
@@ -320,3 +322,155 @@
s1ref = self.cpu.get_latest_value_ref(i)
s1 = lltype.cast_opaque_ptr(lltype.Ptr(S1), s1ref)
assert s1 == getattr(s2, 's%d' % i)
+
+
+class MockShadowStackRootMap(MockGcRootMap):
+ is_shadow_stack = True
+ MARKER_FRAME = 88 # this marker follows the frame addr
+ S1 = lltype.GcStruct('S1')
+
+ def __init__(self):
+ self.addrs = lltype.malloc(rffi.CArray(lltype.Signed), 20,
+ flavor='raw')
+ # root_stack_top
+ self.addrs[0] = rffi.cast(lltype.Signed, self.addrs) + 3*WORD
+ # random stuff
+ self.addrs[1] = 123456
+ self.addrs[2] = 654321
+ self.check_initial_and_final_state()
+ self.callshapes = {}
+ self.should_see = []
+
+ def check_initial_and_final_state(self):
+ assert self.addrs[0] == rffi.cast(lltype.Signed, self.addrs) + 3*WORD
+ assert self.addrs[1] == 123456
+ assert self.addrs[2] == 654321
+
+ def get_root_stack_top_addr(self):
+ return rffi.cast(lltype.Signed, self.addrs)
+
+ def compress_callshape(self, shape, datablockwrapper):
+ assert shape[0] == 'shape'
+ return ['compressed'] + shape[1:]
+
+ def write_callshape(self, mark, force_index):
+ assert mark[0] == 'compressed'
+ assert force_index not in self.callshapes
+ assert force_index == 42 + len(self.callshapes)
+ self.callshapes[force_index] = mark
+
+ def hook_malloc_slowpath(self):
+ num_entries = self.addrs[0] - rffi.cast(lltype.Signed, self.addrs)
+ assert num_entries == 5*WORD # 3 initially, plus 2 by the asm frame
+ assert self.addrs[1] == 123456 # unchanged
+ assert self.addrs[2] == 654321 # unchanged
+ frame_addr = self.addrs[3] # pushed by the asm frame
+ assert self.addrs[4] == self.MARKER_FRAME # pushed by the asm frame
+ #
+ from pypy.jit.backend.x86.arch import FORCE_INDEX_OFS
+ addr = rffi.cast(rffi.CArrayPtr(lltype.Signed),
+ frame_addr + FORCE_INDEX_OFS)
+ force_index = addr[0]
+ assert force_index == 43 # in this test: the 2nd call_malloc_nursery
+ #
+ # The callshapes[43] saved above should list addresses both in the
+ # COPY_AREA and in the "normal" stack, where all the 16 values p1-p16
+ # of test_save_regs_at_correct_place should have been stored. Here
+ # we replace them with new addresses, to emulate a moving GC.
+ shape = self.callshapes[force_index]
+ assert len(shape[1:]) == len(self.should_see)
+ new_objects = [None] * len(self.should_see)
+ for ofs in shape[1:]:
+ assert isinstance(ofs, int) # not a register at all here
+ addr = rffi.cast(rffi.CArrayPtr(lltype.Signed), frame_addr + ofs)
+ contains = addr[0]
+ for j in range(len(self.should_see)):
+ obj = self.should_see[j]
+ if contains == rffi.cast(lltype.Signed, obj):
+ assert new_objects[j] is None # duplicate?
+ break
+ else:
+ assert 0 # the value read from the stack looks random?
+ new_objects[j] = lltype.malloc(self.S1)
+ addr[0] = rffi.cast(lltype.Signed, new_objects[j])
+ self.should_see[:] = new_objects
+
+
+class TestMallocShadowStack(BaseTestRegalloc):
+
+ def setup_method(self, method):
+ cpu = CPU(None, None)
+ cpu.gc_ll_descr = GCDescrFastpathMalloc()
+ cpu.gc_ll_descr.gcrootmap = MockShadowStackRootMap()
+ cpu.setup_once()
+ for i in range(42):
+ cpu.reserve_some_free_fail_descr_number()
+ self.cpu = cpu
+
+ def test_save_regs_at_correct_place(self):
+ cpu = self.cpu
+ gc_ll_descr = cpu.gc_ll_descr
+ S1 = gc_ll_descr.gcrootmap.S1
+ S2 = lltype.GcStruct('S2', ('s0', lltype.Ptr(S1)),
+ ('s1', lltype.Ptr(S1)),
+ ('s2', lltype.Ptr(S1)),
+ ('s3', lltype.Ptr(S1)),
+ ('s4', lltype.Ptr(S1)),
+ ('s5', lltype.Ptr(S1)),
+ ('s6', lltype.Ptr(S1)),
+ ('s7', lltype.Ptr(S1)),
+ ('s8', lltype.Ptr(S1)),
+ ('s9', lltype.Ptr(S1)),
+ ('s10', lltype.Ptr(S1)),
+ ('s11', lltype.Ptr(S1)),
+ ('s12', lltype.Ptr(S1)),
+ ('s13', lltype.Ptr(S1)),
+ ('s14', lltype.Ptr(S1)),
+ ('s15', lltype.Ptr(S1)))
+ self.namespace = self.namespace.copy()
+ for i in range(16):
+ self.namespace['ds%i' % i] = cpu.fielddescrof(S2, 's%d' % i)
+ ops = '''
+ [p0]
+ p1 = getfield_gc(p0, descr=ds0)
+ p2 = getfield_gc(p0, descr=ds1)
+ p3 = getfield_gc(p0, descr=ds2)
+ p4 = getfield_gc(p0, descr=ds3)
+ p5 = getfield_gc(p0, descr=ds4)
+ p6 = getfield_gc(p0, descr=ds5)
+ p7 = getfield_gc(p0, descr=ds6)
+ p8 = getfield_gc(p0, descr=ds7)
+ p9 = getfield_gc(p0, descr=ds8)
+ p10 = getfield_gc(p0, descr=ds9)
+ p11 = getfield_gc(p0, descr=ds10)
+ p12 = getfield_gc(p0, descr=ds11)
+ p13 = getfield_gc(p0, descr=ds12)
+ p14 = getfield_gc(p0, descr=ds13)
+ p15 = getfield_gc(p0, descr=ds14)
+ p16 = getfield_gc(p0, descr=ds15)
+ #
+ # now all registers are in use
+ p17 = call_malloc_nursery(40)
+ p18 = call_malloc_nursery(40) # overflow
+ #
+ finish(p1, p2, p3, p4, p5, p6, p7, p8, \
+ p9, p10, p11, p12, p13, p14, p15, p16)
+ '''
+ s2 = lltype.malloc(S2)
+ for i in range(16):
+ s1 = lltype.malloc(S1)
+ setattr(s2, 's%d' % i, s1)
+ gc_ll_descr.gcrootmap.should_see.append(s1)
+ s2ref = lltype.cast_opaque_ptr(llmemory.GCREF, s2)
+ #
+ self.interpret(ops, [s2ref])
+ gc_ll_descr.check_nothing_in_nursery()
+ assert gc_ll_descr.calls == [40]
+ gc_ll_descr.gcrootmap.check_initial_and_final_state()
+ # check the returned pointers
+ for i in range(16):
+ s1ref = self.cpu.get_latest_value_ref(i)
+ s1 = lltype.cast_opaque_ptr(lltype.Ptr(S1), s1ref)
+ for j in range(16):
+ assert s1 != getattr(s2, 's%d' % j)
+ assert s1 == gc_ll_descr.gcrootmap.should_see[i]
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