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https://github.com/KhronosGroup/SPIRV-Tools
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0a07cd1c9a
If the fuzzer's fact manager knows that ids A and B are synonymous, it can replace a use of A with a use of B, so long as various conditions hold (e.g. the definition of B must dominate the use of A, and it is not legal to replace a use of an OpConstant in a struct's access chain with a synonym that is not an OpConstant). This change adds a fuzzer pass to sprinke such synonym replacements through the module.
60 lines
2.5 KiB
C++
60 lines
2.5 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_add_dead_continues.h"
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#include "source/fuzz/transformation_add_dead_continue.h"
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassAddDeadContinues::FuzzerPassAddDeadContinues(
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opt::IRContext* ir_context, FactManager* fact_manager,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations)
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: FuzzerPass(ir_context, fact_manager, fuzzer_context, transformations) {}
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FuzzerPassAddDeadContinues::~FuzzerPassAddDeadContinues() = default;
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void FuzzerPassAddDeadContinues::Apply() {
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// Consider every block in every function.
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for (auto& function : *GetIRContext()->module()) {
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for (auto& block : function) {
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// Make a transformation to add a dead continue from this node; if the
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// node turns out to be inappropriate (e.g. by not being in a loop) the
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// precondition for the transformation will fail and it will be ignored.
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//
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// TODO(https://github.com/KhronosGroup/SPIRV-Tools/issues/2856): right
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// now we completely ignore OpPhi instructions at continue targets.
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// This will lead to interesting opportunities being missed.
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auto candidate_transformation = TransformationAddDeadContinue(
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block.id(), GetFuzzerContext()->ChooseEven(), {});
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// Probabilistically decide whether to apply the transformation in the
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// case that it is applicable.
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if (candidate_transformation.IsApplicable(GetIRContext(),
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*GetFactManager()) &&
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GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfAddingDeadContinue())) {
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candidate_transformation.Apply(GetIRContext(), GetFactManager());
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*GetTransformations()->add_transformation() =
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candidate_transformation.ToMessage();
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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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