66 строки
2.3 KiB
C++
66 строки
2.3 KiB
C++
// Copyright (c) 2020 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_loop_preheaders.h"
|
|
|
|
#include "source/fuzz/fuzzer_util.h"
|
|
#include "source/fuzz/transformation_add_loop_preheader.h"
|
|
|
|
namespace spvtools {
|
|
namespace fuzz {
|
|
|
|
FuzzerPassAddLoopPreheaders::FuzzerPassAddLoopPreheaders(
|
|
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 FuzzerPassAddLoopPreheaders::Apply() {
|
|
for (auto& function : *GetIRContext()->module()) {
|
|
// Keep track of all the loop headers we want to add a preheader to.
|
|
std::vector<uint32_t> loop_header_ids_to_consider;
|
|
for (auto& block : function) {
|
|
// We only care about loop headers.
|
|
if (!block.IsLoopHeader()) {
|
|
continue;
|
|
}
|
|
|
|
// Randomly decide whether to consider this header.
|
|
if (!GetFuzzerContext()->ChoosePercentage(
|
|
GetFuzzerContext()->GetChanceOfAddingLoopPreheader())) {
|
|
continue;
|
|
}
|
|
|
|
// We exclude loop headers with just one predecessor (the back-edge block)
|
|
// because they are unreachable.
|
|
if (GetIRContext()->cfg()->preds(block.id()).size() < 2) {
|
|
continue;
|
|
}
|
|
|
|
loop_header_ids_to_consider.push_back(block.id());
|
|
}
|
|
|
|
for (uint32_t header_id : loop_header_ids_to_consider) {
|
|
// If not already present, add a preheader which is not also a loop
|
|
// header.
|
|
GetOrCreateSimpleLoopPreheader(header_id);
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace fuzz
|
|
} // namespace spvtools
|