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https://github.com/KhronosGroup/SPIRV-Tools
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c0833ce620
Subclasses of FuzzerPass no longer needlessly override the default destructor of FuzzerPass.
71 lines
2.6 KiB
C++
71 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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#include "source/fuzz/fuzzer_pass_adjust_selection_controls.h"
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#include "source/fuzz/transformation_set_selection_control.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassAdjustSelectionControls::FuzzerPassAdjustSelectionControls(
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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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: FuzzerPass(ir_context, transformation_context, fuzzer_context,
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transformations) {}
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void FuzzerPassAdjustSelectionControls::Apply() {
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// Consider every merge instruction in the module (via looking through all
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// functions and blocks).
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for (auto& function : *GetIRContext()->module()) {
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for (auto& block : function) {
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if (auto merge_inst = block.GetMergeInst()) {
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// Ignore the instruction if it is not a selection merge.
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if (merge_inst->opcode() != SpvOpSelectionMerge) {
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continue;
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}
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// Choose randomly whether to change the selection control for this
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// instruction.
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfAdjustingSelectionControl())) {
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continue;
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}
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// The choices to change the selection control to are the set of valid
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// controls, minus the current control.
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std::vector<uint32_t> choices;
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for (auto control :
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{SpvSelectionControlMaskNone, SpvSelectionControlFlattenMask,
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SpvSelectionControlDontFlattenMask}) {
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if (control == merge_inst->GetSingleWordOperand(1)) {
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continue;
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}
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choices.push_back(control);
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}
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// Apply the transformation and add it to the output transformation
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// sequence.
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TransformationSetSelectionControl transformation(
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block.id(), choices[GetFuzzerContext()->RandomIndex(choices)]);
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ApplyTransformation(transformation);
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}
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}
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}
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}
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} // namespace fuzz
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} // namespace spvtools
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