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71 lines
2.1 KiB
Python
71 lines
2.1 KiB
Python
# Copyright 2021 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import textwrap
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import capa.rules
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import capa.engine
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import capa.optimizer
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import capa.features.common
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from capa.engine import Or, And
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from capa.features.insn import Mnemonic
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from capa.features.common import Arch, Substring
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def test_optimizer_order():
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rule = textwrap.dedent("""
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rule:
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meta:
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name: test rule
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scopes:
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static: function
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dynamic: process
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features:
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- and:
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- substring: "foo"
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- arch: amd64
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- mnemonic: cmp
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- and:
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- bytes: 3
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- offset: 2
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- or:
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- number: 1
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- offset: 4
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""")
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r = capa.rules.Rule.from_yaml(rule)
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# before optimization
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children = list(r.statement.get_children())
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assert isinstance(children[0], Substring)
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assert isinstance(children[1], Arch)
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assert isinstance(children[2], Mnemonic)
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assert isinstance(children[3], And)
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assert isinstance(children[4], Or)
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# after optimization
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capa.optimizer.optimize_rules([r])
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children = list(r.statement.get_children())
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# cost: 0
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assert isinstance(children[0], Arch)
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# cost: 1
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assert isinstance(children[1], Mnemonic)
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# cost: 2
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assert isinstance(children[2], Substring)
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# cost: 3
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assert isinstance(children[3], Or)
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# cost: 4
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assert isinstance(children[4], And)
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