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https://github.com/KhronosGroup/SPIRV-Tools
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9c4481419e
spirv-fuzz features transformations that should be applicable by construction. Assertions are used to detect when such transformations turn out to be inapplicable. Failures of such assertions indicate bugs in the fuzzer. However, when using the fuzzer at scale (e.g. in ClusterFuzz) reports of these assertion failures create noise, and cause the fuzzer to exit early. This change adds an option whereby inapplicable transformations can be ignored. This reduces noise and allows fuzzing to continue even when a transformation that should be applicable but is not has been erroneously created.
53 lines
2.0 KiB
C++
53 lines
2.0 KiB
C++
// Copyright (c) 2020 Stefano Milizia
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// Copyright (c) 2020 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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#ifndef SOURCE_FUZZ_FUZZER_PASS_INTERCHANGE_ZERO_LIKE_CONSTANTS_H_
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#define SOURCE_FUZZ_FUZZER_PASS_INTERCHANGE_ZERO_LIKE_CONSTANTS_H_
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#include "source/fuzz/fuzzer_pass.h"
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namespace spvtools {
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namespace fuzz {
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// A pass that:
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// - Finds all the zero-like constant definitions in the module and adds the
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// definitions of the corresponding synonym, recording the fact that they
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// are synonymous. If the synonym is already in the module, it does not
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// add a new one.
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// - For each use of a zero-like constant, decides whether to change it to the
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// id of the toggled constant.
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class FuzzerPassInterchangeZeroLikeConstants : public FuzzerPass {
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public:
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FuzzerPassInterchangeZeroLikeConstants(
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opt::IRContext* ir_context, TransformationContext* transformation_context,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations,
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bool ignore_inapplicable_transformations);
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void Apply() override;
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private:
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// Given the declaration of a zero-like constant, it finds or creates the
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// corresponding toggled constant (a scalar constant of value 0 becomes a
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// null constant of the same type and vice versa).
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// Returns the id of the toggled instruction if the constant is zero-like,
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// 0 otherwise.
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uint32_t FindOrCreateToggledConstant(opt::Instruction* declaration);
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};
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} // namespace fuzz
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} // namespace spvtools
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#endif // SOURCE_FUZZ_FUZZER_PASS_INTERCHANGE_ZERO_LIKE_CONSTANTS_H_
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