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# Copyright (c) Meta Platforms, Inc. and affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
from drgn import NULL, Object
from drgn.helpers.linux.radixtree import radix_tree_for_each, radix_tree_lookup
from tests.linux_kernel import LinuxKernelTestCase, skip_unless_have_test_kmod
@skip_unless_have_test_kmod
class TestRadixTree(LinuxKernelTestCase):
def test_radix_tree_lookup_empty(self):
root = self.prog["drgn_test_radix_tree_empty"].address_of_()
self.assertIdentical(radix_tree_lookup(root, 0), NULL(self.prog, "void *"))
self.assertIdentical(radix_tree_lookup(root, 100000), NULL(self.prog, "void *"))
def test_radix_tree_for_each_empty(self):
root = self.prog["drgn_test_radix_tree_empty"].address_of_()
self.assertIdentical(list(radix_tree_for_each(root)), [])
def test_radix_tree_lookup_one(self):
root = self.prog["drgn_test_radix_tree_one"].address_of_()
self.assertIdentical(radix_tree_lookup(root, 0), NULL(self.prog, "void *"))
self.assertIdentical(radix_tree_lookup(root, 665), NULL(self.prog, "void *"))
self.assertIdentical(
radix_tree_lookup(root, 666), Object(self.prog, "void *", 0xDEADB00)
)
self.assertIdentical(radix_tree_lookup(root, 667), NULL(self.prog, "void *"))
self.assertIdentical(radix_tree_lookup(root, 100000), NULL(self.prog, "void *"))
def test_radix_tree_for_each_one(self):
root = self.prog["drgn_test_radix_tree_one"].address_of_()
self.assertIdentical(
list(radix_tree_for_each(root)),
[(666, Object(self.prog, "void *", 0xDEADB00))],
)
def test_radix_tree_lookup_one_at_zero(self):
root = self.prog["drgn_test_radix_tree_one_at_zero"].address_of_()
self.assertIdentical(
radix_tree_lookup(root, 0), Object(self.prog, "void *", 0x1234)
)
self.assertIdentical(radix_tree_lookup(root, 1), NULL(self.prog, "void *"))
self.assertIdentical(radix_tree_lookup(root, 100000), NULL(self.prog, "void *"))
def test_radix_tree_for_each_one_at_zero(self):
root = self.prog["drgn_test_radix_tree_one_at_zero"].address_of_()
self.assertIdentical(
list(radix_tree_for_each(root)), [(0, Object(self.prog, "void *", 0x1234))]
)
def test_radix_tree_lookup_sparse(self):
root = self.prog["drgn_test_radix_tree_sparse"].address_of_()
self.assertIdentical(radix_tree_lookup(root, 0), NULL(self.prog, "void *"))
self.assertIdentical(
radix_tree_lookup(root, 1), Object(self.prog, "void *", 0x1234)
)
self.assertIdentical(radix_tree_lookup(root, 2), NULL(self.prog, "void *"))
self.assertIdentical(
radix_tree_lookup(root, 0x40000000), NULL(self.prog, "void *")
)
self.assertIdentical(
radix_tree_lookup(root, 0x80000000), NULL(self.prog, "void *")
)
self.assertIdentical(
radix_tree_lookup(root, 0x80800000), NULL(self.prog, "void *")
)
self.assertIdentical(
radix_tree_lookup(root, 0x80808000), NULL(self.prog, "void *")
)
self.assertIdentical(
radix_tree_lookup(root, 0x80808080), Object(self.prog, "void *", 0x5678)
)
self.assertIdentical(
radix_tree_lookup(root, 0xFFFFFFFE), NULL(self.prog, "void *")
)
self.assertIdentical(
radix_tree_lookup(root, 0xFFFFFFFF), Object(self.prog, "void *", 0x9ABC)
)
def test_radix_tree_for_each_sparse(self):
root = self.prog["drgn_test_radix_tree_sparse"].address_of_()
self.assertIdentical(
list(radix_tree_for_each(root)),
[
(1, Object(self.prog, "void *", 0x1234)),
(0x80808080, Object(self.prog, "void *", 0x5678)),
(0xFFFFFFFF, Object(self.prog, "void *", 0x9ABC)),
],
)
def test_radix_tree_lookup_multi_index(self):
try:
root = self.prog["drgn_test_radix_tree_multi_order"].address_of_()
except KeyError:
# Radix tree multi-order support only exists between Linux kernel
# commits e61452365372 ("radix_tree: add support for multi-order
# entries") (in v4.6) and 3a08cd52c37c ("radix tree: Remove
# multiorder support") (in v4.20), and only if
# CONFIG_RADIX_TREE_MULTIORDER=y.
self.skipTest("kernel does not have multi-order radix trees")
self.assertIdentical(
radix_tree_lookup(root, 0x80807FFF), NULL(self.prog, "void *")
)
for index in range(0x80808000, 0x80808200):
with self.subTest(index=index):
self.assertIdentical(
radix_tree_lookup(root, index), Object(self.prog, "void *", 0x1234)
)
self.assertIdentical(
radix_tree_lookup(root, 0x80808200), NULL(self.prog, "void *")
)
def test_radix_tree_for_each_multi_index(self):
try:
root = self.prog["drgn_test_radix_tree_multi_order"].address_of_()
except KeyError:
# See test_radix_tree_lookup_multi_index().
self.skipTest("kernel does not have multi-order radix trees")
self.assertIdentical(
list(radix_tree_for_each(root)),
[(0x80808000, Object(self.prog, "void *", 0x1234))],
)
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