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spirv-fuzz: Fuzzer pass to randomly apply loop preheaders (KhronosGro…
…up#3668) This PR introduces FuzzerPassAddLoopPreheaders, which: - Finds existing loop headers - If they have no simple preheader (where simple means that the preheader itself is not a loop header), randomly decides whether to add one. Fixes KhronosGroup#3621.
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| Original file line number | Diff line number | Diff line change |
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| // Copyright (c) 2020 Google LLC | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| #include "source/fuzz/fuzzer_pass_add_loop_preheaders.h" | ||
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| #include "source/fuzz/fuzzer_util.h" | ||
| #include "source/fuzz/transformation_add_loop_preheader.h" | ||
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| namespace spvtools { | ||
| namespace fuzz { | ||
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| FuzzerPassAddLoopPreheaders::FuzzerPassAddLoopPreheaders( | ||
| opt::IRContext* ir_context, TransformationContext* transformation_context, | ||
| FuzzerContext* fuzzer_context, | ||
| protobufs::TransformationSequence* transformations) | ||
| : FuzzerPass(ir_context, transformation_context, fuzzer_context, | ||
| transformations) {} | ||
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| FuzzerPassAddLoopPreheaders::~FuzzerPassAddLoopPreheaders() = default; | ||
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| void FuzzerPassAddLoopPreheaders::Apply() { | ||
| for (auto& function : *GetIRContext()->module()) { | ||
| // Keep track of all the loop headers we want to add a preheader to. | ||
| std::vector<uint32_t> loop_header_ids_to_consider; | ||
| for (auto& block : function) { | ||
| // We only care about loop headers. | ||
| if (!block.IsLoopHeader()) { | ||
| continue; | ||
| } | ||
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| // Randomly decide whether to consider this header. | ||
| if (!GetFuzzerContext()->ChoosePercentage( | ||
| GetFuzzerContext()->GetChanceOfAddingLoopPreheader())) { | ||
| continue; | ||
| } | ||
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| // We exclude loop headers with just one predecessor (the back-edge block) | ||
| // because they are unreachable. | ||
| if (GetIRContext()->cfg()->preds(block.id()).size() < 2) { | ||
| continue; | ||
| } | ||
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| loop_header_ids_to_consider.push_back(block.id()); | ||
| } | ||
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| for (uint32_t header_id : loop_header_ids_to_consider) { | ||
| // If not already present, add a preheader which is not also a loop | ||
| // header. | ||
| GetOrCreateSimpleLoopPreheader(header_id); | ||
| } | ||
| } | ||
| } | ||
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| } // namespace fuzz | ||
| } // namespace spvtools |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| // Copyright (c) 2020 Google LLC | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| #ifndef SOURCE_FUZZ_FUZZER_PASS_ADD_LOOP_PREHEADERS_H | ||
| #define SOURCE_FUZZ_FUZZER_PASS_ADD_LOOP_PREHEADERS_H | ||
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| #include "source/fuzz/fuzzer_pass.h" | ||
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| namespace spvtools { | ||
| namespace fuzz { | ||
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| // A fuzzer pass that randomly adds simple loop preheaders to loops that do not | ||
| // have one. A simple loop preheader is a block that: | ||
| // - is the only out-of-loop predecessor of the header | ||
| // - branches unconditionally to the header | ||
| // - is not a loop header itself | ||
| class FuzzerPassAddLoopPreheaders : public FuzzerPass { | ||
| public: | ||
| FuzzerPassAddLoopPreheaders( | ||
| opt::IRContext* ir_context, TransformationContext* transformation_context, | ||
| FuzzerContext* fuzzer_context, | ||
| protobufs::TransformationSequence* transformations); | ||
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| ~FuzzerPassAddLoopPreheaders(); | ||
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| void Apply() override; | ||
| }; | ||
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| } // namespace fuzz | ||
| } // namespace spvtools | ||
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| #endif // SOURCE_FUZZ_FUZZER_PASS_ADD_LOOP_PREHEADERS_H |