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// Copyright (c) 2020 Vasyl Teliman
//
// 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_propagate_instructions_down.h"
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/transformation_propagate_instruction_down.h"
namespace spvtools {
namespace fuzz {
FuzzerPassPropagateInstructionsDown::FuzzerPassPropagateInstructionsDown(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations,
bool ignore_inapplicable_transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations, ignore_inapplicable_transformations) {}
void FuzzerPassPropagateInstructionsDown::Apply() {
for (const auto& function : *GetIRContext()->module()) {
std::vector<const opt::BasicBlock*> reachable_blocks;
for (const auto& block : function) {
if (GetIRContext()->IsReachable(block)) {
reachable_blocks.push_back(&block);
}
}
for (const auto* block : reachable_blocks) {
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfPropagatingInstructionsDown())) {
continue;
}
if (TransformationPropagateInstructionDown::IsApplicableToBlock(
GetIRContext(), block->id())) {
// Record fresh ids for every successor of the |block| that we can
// propagate an instruction into.
std::map<uint32_t, uint32_t> fresh_ids;
for (auto id :
TransformationPropagateInstructionDown::GetAcceptableSuccessors(
GetIRContext(), block->id())) {
fresh_ids[id] = GetFuzzerContext()->GetFreshId();
}
ApplyTransformation(TransformationPropagateInstructionDown(
block->id(), GetFuzzerContext()->GetFreshId(), fresh_ids));
}
}
}
}
} // namespace fuzz
} // namespace spvtools
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