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// 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_adjust_function_controls.h"
#include "source/fuzz/transformation_set_function_control.h"
namespace spvtools {
namespace fuzz {
FuzzerPassAdjustFunctionControls::FuzzerPassAdjustFunctionControls(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations) {}
FuzzerPassAdjustFunctionControls::~FuzzerPassAdjustFunctionControls() = default;
void FuzzerPassAdjustFunctionControls::Apply() {
// Consider every function in the module.
for (auto& function : *GetIRContext()->module()) {
// Randomly decide whether to adjust this function's controls.
if (GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfAdjustingFunctionControl())) {
// Grab the function control mask for the function in its present form.
uint32_t existing_function_control_mask =
function.DefInst().GetSingleWordInOperand(0);
// For the new mask, we first randomly select one of three basic masks:
// None, Inline or DontInline. These are always valid (and are mutually
// exclusive).
std::vector<uint32_t> basic_function_control_masks = {
SpvFunctionControlMaskNone, SpvFunctionControlInlineMask,
SpvFunctionControlDontInlineMask};
uint32_t new_function_control_mask =
basic_function_control_masks[GetFuzzerContext()->RandomIndex(
basic_function_control_masks)];
// We now consider the Pure and Const mask bits. If these are already
// set on the function then it's OK to keep them, but also interesting
// to consider dropping them, so we decide randomly in each case.
for (auto mask_bit :
{SpvFunctionControlPureMask, SpvFunctionControlConstMask}) {
if ((existing_function_control_mask & mask_bit) &&
GetFuzzerContext()->ChooseEven()) {
new_function_control_mask |= mask_bit;
}
}
// Create and add a transformation.
TransformationSetFunctionControl transformation(
function.DefInst().result_id(), new_function_control_mask);
ApplyTransformation(transformation);
}
}
}
} // namespace fuzz
} // namespace spvtools
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