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https://github.com/KhronosGroup/SPIRV-Tools
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c0833ce620
Subclasses of FuzzerPass no longer needlessly override the default destructor of FuzzerPass.
70 lines
2.8 KiB
C++
70 lines
2.8 KiB
C++
// Copyright (c) 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "source/fuzz/fuzzer_pass_adjust_function_controls.h"
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#include "source/fuzz/transformation_set_function_control.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassAdjustFunctionControls::FuzzerPassAdjustFunctionControls(
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opt::IRContext* ir_context, TransformationContext* transformation_context,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations)
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: FuzzerPass(ir_context, transformation_context, fuzzer_context,
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transformations) {}
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void FuzzerPassAdjustFunctionControls::Apply() {
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// Consider every function in the module.
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for (auto& function : *GetIRContext()->module()) {
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// Randomly decide whether to adjust this function's controls.
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if (GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfAdjustingFunctionControl())) {
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// Grab the function control mask for the function in its present form.
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uint32_t existing_function_control_mask =
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function.DefInst().GetSingleWordInOperand(0);
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// For the new mask, we first randomly select one of three basic masks:
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// None, Inline or DontInline. These are always valid (and are mutually
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// exclusive).
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std::vector<uint32_t> basic_function_control_masks = {
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SpvFunctionControlMaskNone, SpvFunctionControlInlineMask,
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SpvFunctionControlDontInlineMask};
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uint32_t new_function_control_mask =
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basic_function_control_masks[GetFuzzerContext()->RandomIndex(
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basic_function_control_masks)];
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// We now consider the Pure and Const mask bits. If these are already
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// set on the function then it's OK to keep them, but also interesting
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// to consider dropping them, so we decide randomly in each case.
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for (auto mask_bit :
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{SpvFunctionControlPureMask, SpvFunctionControlConstMask}) {
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if ((existing_function_control_mask & mask_bit) &&
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GetFuzzerContext()->ChooseEven()) {
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new_function_control_mask |= mask_bit;
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}
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}
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// Create and add a transformation.
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TransformationSetFunctionControl transformation(
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function.DefInst().result_id(), new_function_control_mask);
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ApplyTransformation(transformation);
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}
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}
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}
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} // namespace fuzz
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} // namespace spvtools
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