mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-30 06:50:06 +00:00
72 lines
2.9 KiB
C++
72 lines
2.9 KiB
C++
// Copyright (c) 2019 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.
|
|
|
|
#include "source/fuzz/fuzzer_pass_add_dead_blocks.h"
|
|
|
|
#include "source/fuzz/fuzzer_util.h"
|
|
#include "source/fuzz/transformation_add_dead_block.h"
|
|
|
|
namespace spvtools {
|
|
namespace fuzz {
|
|
|
|
FuzzerPassAddDeadBlocks::FuzzerPassAddDeadBlocks(
|
|
opt::IRContext* ir_context, TransformationContext* transformation_context,
|
|
FuzzerContext* fuzzer_context,
|
|
protobufs::TransformationSequence* transformations)
|
|
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
|
|
transformations) {}
|
|
|
|
FuzzerPassAddDeadBlocks::~FuzzerPassAddDeadBlocks() = default;
|
|
|
|
void FuzzerPassAddDeadBlocks::Apply() {
|
|
// We iterate over all blocks in the module collecting up those at which we
|
|
// might add a branch to a new dead block. We then loop over all such
|
|
// candidates and actually apply transformations. This separation is to
|
|
// avoid modifying the module as we traverse it.
|
|
std::vector<TransformationAddDeadBlock> candidate_transformations;
|
|
for (auto& function : *GetIRContext()->module()) {
|
|
for (auto& block : function) {
|
|
if (!GetFuzzerContext()->ChoosePercentage(
|
|
GetFuzzerContext()->GetChanceOfAddingDeadBlock())) {
|
|
continue;
|
|
}
|
|
|
|
// Make sure the module contains a boolean constant equal to
|
|
// |condition_value|.
|
|
bool condition_value = GetFuzzerContext()->ChooseEven();
|
|
FindOrCreateBoolConstant(condition_value);
|
|
|
|
// We speculatively create a transformation, and then apply it (below) if
|
|
// it turns out to be applicable. This avoids duplicating the logic for
|
|
// applicability checking.
|
|
//
|
|
// It means that fresh ids for transformations that turn out not to be
|
|
// applicable end up being unused.
|
|
candidate_transformations.emplace_back(TransformationAddDeadBlock(
|
|
GetFuzzerContext()->GetFreshId(), block.id(), condition_value));
|
|
}
|
|
}
|
|
// Apply all those transformations that are in fact applicable.
|
|
for (auto& transformation : candidate_transformations) {
|
|
if (transformation.IsApplicable(GetIRContext(),
|
|
*GetTransformationContext())) {
|
|
transformation.Apply(GetIRContext(), GetTransformationContext());
|
|
*GetTransformations()->add_transformation() = transformation.ToMessage();
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace fuzz
|
|
} // namespace spvtools
|