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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.
65 lines
2.6 KiB
C++
65 lines
2.6 KiB
C++
// Copyright (c) 2019 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_OUTLINE_FUNCTIONS_H_
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#define SOURCE_FUZZ_FUZZER_PASS_OUTLINE_FUNCTIONS_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 fuzzer pass for outlining single-entry single-exit regions of a control
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// flow graph into their own functions.
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class FuzzerPassOutlineFunctions : public FuzzerPass {
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public:
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FuzzerPassOutlineFunctions(opt::IRContext* ir_context,
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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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// Returns a block suitable to be an entry block for a region that can be
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// outlined, i.e. a block that is not a loop header and that does not start
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// with OpPhi or OpVariable. In particular, it returns:
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// - |entry_block| if it is suitable
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// - otherwise, a block found by:
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// - looking for or creating a new preheader, if |entry_block| is a loop
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// header
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// - splitting the candidate entry block, if it starts with OpPhi or
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// OpVariable.
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// Returns nullptr if a suitable block cannot be found following the
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// instructions above.
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opt::BasicBlock* MaybeGetEntryBlockSuitableForOutlining(
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opt::BasicBlock* entry_block);
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// Returns:
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// - |exit_block| if it is not a merge block
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// - the second block obtained by splitting |exit_block|, if |exit_block| is a
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// merge block.
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// Assumes that |exit_block| is not a continue target.
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// The block returned by this function should be suitable to be the exit block
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// of a region that can be outlined.
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// Returns nullptr if |exit_block| is a merge block and it cannot be split.
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opt::BasicBlock* MaybeGetExitBlockSuitableForOutlining(
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opt::BasicBlock* exit_block);
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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_OUTLINE_FUNCTIONS_H_
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