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https://github.com/KhronosGroup/SPIRV-Tools
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Some transformations (e.g. TransformationAddFunction) rely on running the validator to decide whether the transformation is applicable. A recent change allowed spirv-fuzz to take validator options, to cater for the case where a module should be considered valid under particular conditions. However, validation during the checking of transformations had no access to these validator options. This change introduced TransformationContext, which currently consists of a fact manager and a set of validator options, but could in the future have other fields corresponding to other objects that it is useful to have access to when applying transformations. Now, instead of checking and applying transformations in the context of a FactManager, a TransformationContext is used. This gives access to the fact manager as before, and also access to the validator options when they are needed.
67 lines
2.7 KiB
C++
67 lines
2.7 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_blocks.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/transformation_add_dead_block.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassAddDeadBlocks::FuzzerPassAddDeadBlocks(
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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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FuzzerPassAddDeadBlocks::~FuzzerPassAddDeadBlocks() = default;
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void FuzzerPassAddDeadBlocks::Apply() {
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// We iterate over all blocks in the module collecting up those at which we
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// might add a branch to a new dead block. We then loop over all such
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// candidates and actually apply transformations. This separation is to
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// avoid modifying the module as we traverse it.
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std::vector<TransformationAddDeadBlock> candidate_transformations;
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for (auto& function : *GetIRContext()->module()) {
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for (auto& block : function) {
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfAddingDeadBlock())) {
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continue;
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}
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// We speculatively create a transformation, and then apply it (below) if
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// it turns out to be applicable. This avoids duplicating the logic for
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// applicability checking.
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//
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// It means that fresh ids for transformations that turn out not to be
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// applicable end up being unused.
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candidate_transformations.emplace_back(TransformationAddDeadBlock(
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GetFuzzerContext()->GetFreshId(), block.id(),
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GetFuzzerContext()->ChooseEven()));
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}
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}
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// Apply all those transformations that are in fact applicable.
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for (auto& transformation : candidate_transformations) {
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if (transformation.IsApplicable(GetIRContext(),
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*GetTransformationContext())) {
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transformation.Apply(GetIRContext(), GetTransformationContext());
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*GetTransformations()->add_transformation() = transformation.ToMessage();
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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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