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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_permute_instructions.h"
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/fuzz/transformation_move_instruction_down.h"
namespace spvtools {
namespace fuzz {
FuzzerPassPermuteInstructions::FuzzerPassPermuteInstructions(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations) {}
void FuzzerPassPermuteInstructions::Apply() {
// We are iterating over all instructions in all basic blocks.
for (auto& function : *GetIRContext()->module()) {
for (auto& block : function) {
// We need to collect all instructions in the block into a separate vector
// since application of the transformation below might invalidate
// iterators.
std::vector<opt::Instruction*> instructions;
for (auto& instruction : block) {
instructions.push_back(&instruction);
}
// We consider all instructions in reverse to increase the possible number
// of applied transformations.
for (auto it = instructions.rbegin(); it != instructions.rend(); ++it) {
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfPermutingInstructions())) {
continue;
}
while (MaybeApplyTransformation(TransformationMoveInstructionDown(
MakeInstructionDescriptor(GetIRContext(), *it)))) {
// Apply the transformation as many times as possible.
}
}
}
}
}
} // namespace fuzz
} // namespace spvtools
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