110 строки
4.6 KiB
C++
110 строки
4.6 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_memory_operands_masks.h"
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#include "source/fuzz/instruction_descriptor.h"
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#include "source/fuzz/transformation_set_memory_operands_mask.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassAdjustMemoryOperandsMasks::FuzzerPassAdjustMemoryOperandsMasks(
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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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bool ignore_inapplicable_transformations)
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: FuzzerPass(ir_context, transformation_context, fuzzer_context,
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transformations, ignore_inapplicable_transformations) {}
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void FuzzerPassAdjustMemoryOperandsMasks::Apply() {
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// Consider every block in every function.
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for (auto& function : *GetIRContext()->module()) {
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for (auto& block : function) {
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// Consider every instruction in this block, using an explicit iterator so
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// that when we find an instruction of interest we can search backwards to
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// create an id descriptor for it.
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for (auto inst_it = block.cbegin(); inst_it != block.cend(); ++inst_it) {
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if (!TransformationSetMemoryOperandsMask::IsMemoryAccess(*inst_it)) {
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// We are only interested in memory access instructions.
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continue;
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}
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std::vector<uint32_t> indices_of_available_masks_to_adjust;
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// All memory instructions have at least one memory operands mask.
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indices_of_available_masks_to_adjust.push_back(0);
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// From SPIR-V 1.4 onwards, OpCopyMemory and OpCopyMemorySized have a
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// second mask.
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switch (inst_it->opcode()) {
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case spv::Op::OpCopyMemory:
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case spv::Op::OpCopyMemorySized:
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if (TransformationSetMemoryOperandsMask::
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MultipleMemoryOperandMasksAreSupported(GetIRContext())) {
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indices_of_available_masks_to_adjust.push_back(1);
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}
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break;
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default:
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break;
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}
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// Consider the available masks
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for (auto mask_index : indices_of_available_masks_to_adjust) {
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// Randomly decide whether to adjust this mask.
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()
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->GetChanceOfAdjustingMemoryOperandsMask())) {
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continue;
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}
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// Get the existing mask, using None if there was no mask present at
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// all.
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auto existing_mask_in_operand_index =
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TransformationSetMemoryOperandsMask::GetInOperandIndexForMask(
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*inst_it, mask_index);
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auto existing_mask =
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existing_mask_in_operand_index < inst_it->NumInOperands()
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? inst_it->GetSingleWordInOperand(
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existing_mask_in_operand_index)
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: static_cast<uint32_t>(spv::MemoryAccessMask::MaskNone);
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// There are two things we can do to a mask:
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// - add Volatile if not already present
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// - toggle Nontemporal
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// The following ensures that we do at least one of these
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bool add_volatile =
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!(existing_mask & uint32_t(spv::MemoryAccessMask::Volatile)) &&
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GetFuzzerContext()->ChooseEven();
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bool toggle_nontemporal =
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!add_volatile || GetFuzzerContext()->ChooseEven();
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// These bitwise operations use '|' to add Volatile if desired, and
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// '^' to toggle Nontemporal if desired.
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uint32_t new_mask =
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(existing_mask |
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(add_volatile ? uint32_t(spv::MemoryAccessMask::Volatile)
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: uint32_t(spv::MemoryAccessMask::MaskNone))) ^
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(toggle_nontemporal ? uint32_t(spv::MemoryAccessMask::Nontemporal)
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: uint32_t(spv::MemoryAccessMask::MaskNone));
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TransformationSetMemoryOperandsMask transformation(
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MakeInstructionDescriptor(block, inst_it), new_mask, mask_index);
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ApplyTransformation(transformation);
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}
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}
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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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