// Copyright (c) 2020 André Perez Maselco
//
// 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_replace_linear_algebra_instructions.h"

#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/fuzz/transformation_replace_linear_algebra_instruction.h"

namespace spvtools {
namespace fuzz {

FuzzerPassReplaceLinearAlgebraInstructions::
    FuzzerPassReplaceLinearAlgebraInstructions(
        opt::IRContext* ir_context,
        TransformationContext* transformation_context,
        FuzzerContext* fuzzer_context,
        protobufs::TransformationSequence* transformations)
    : FuzzerPass(ir_context, transformation_context, fuzzer_context,
                 transformations) {}

FuzzerPassReplaceLinearAlgebraInstructions::
    ~FuzzerPassReplaceLinearAlgebraInstructions() = default;

void FuzzerPassReplaceLinearAlgebraInstructions::Apply() {
  // For each instruction, checks whether it is a supported linear algebra
  // instruction. In this case, the transformation is randomly applied.
  GetIRContext()->module()->ForEachInst([this](opt::Instruction* instruction) {
    // TODO(https://github.com/KhronosGroup/SPIRV-Tools/issues/3354):
    // Right now we only support certain operations. When this issue is
    // addressed the following conditional can use the function
    // |spvOpcodeIsLinearAlgebra|.
    if (instruction->opcode() != SpvOpVectorTimesScalar &&
        instruction->opcode() != SpvOpDot) {
      return;
    }

    if (!GetFuzzerContext()->ChoosePercentage(
            GetFuzzerContext()
                ->GetChanceOfReplacingLinearAlgebraInstructions())) {
      return;
    }

    ApplyTransformation(TransformationReplaceLinearAlgebraInstruction(
        GetFuzzerContext()->GetFreshIds(
            TransformationReplaceLinearAlgebraInstruction::
                GetRequiredFreshIdCount(GetIRContext(), instruction)),
        MakeInstructionDescriptor(GetIRContext(), instruction)));
  });
}

}  // namespace fuzz
}  // namespace spvtools