mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-26 21:30:07 +00:00
f050cca7ec
Makes an id synonym by storing an id to a new variable and then loading it back from that variable. Fixes #3192.
190 lines
9.4 KiB
C++
190 lines
9.4 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_context.h"
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#include <cmath>
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namespace spvtools {
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namespace fuzz {
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namespace {
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// Default <minimum, maximum> pairs of probabilities for applying various
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// transformations. All values are percentages. Keep them in alphabetical order.
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const std::pair<uint32_t, uint32_t> kChanceOfAddingAccessChain = {5, 50};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingAnotherStructField = {20,
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90};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingArrayOrStructType = {20, 90};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingDeadBlock = {20, 90};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingDeadBreak = {5, 80};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingDeadContinue = {5, 80};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingEquationInstruction = {5,
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90};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingGlobalVariable = {20, 90};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingLoad = {5, 50};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingLocalVariable = {20, 90};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingMatrixType = {20, 70};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingNoContractionDecoration = {
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5, 70};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingStore = {5, 50};
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const std::pair<uint32_t, uint32_t> kChanceOfAddingVectorType = {20, 70};
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const std::pair<uint32_t, uint32_t> kChanceOfAdjustingBranchWeights = {20, 90};
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const std::pair<uint32_t, uint32_t> kChanceOfAdjustingFunctionControl = {20,
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70};
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const std::pair<uint32_t, uint32_t> kChanceOfAdjustingLoopControl = {20, 90};
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const std::pair<uint32_t, uint32_t> kChanceOfAdjustingMemoryOperandsMask = {20,
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90};
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const std::pair<uint32_t, uint32_t> kChanceOfAdjustingSelectionControl = {20,
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90};
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const std::pair<uint32_t, uint32_t> kChanceOfCallingFunction = {1, 10};
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const std::pair<uint32_t, uint32_t> kChanceOfChoosingStructTypeVsArrayType = {
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20, 80};
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const std::pair<uint32_t, uint32_t> kChanceOfConstructingComposite = {20, 50};
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const std::pair<uint32_t, uint32_t> kChanceOfCopyingObject = {20, 50};
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const std::pair<uint32_t, uint32_t> kChanceOfDonatingAdditionalModule = {5, 50};
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const std::pair<uint32_t, uint32_t> kChanceOfGoingDeeperWhenMakingAccessChain =
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{50, 95};
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const std::pair<uint32_t, uint32_t> kChanceOfMakingDonorLivesafe = {40, 60};
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const std::pair<uint32_t, uint32_t> kChanceOfMergingBlocks = {20, 95};
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const std::pair<uint32_t, uint32_t> kChanceOfMovingBlockDown = {20, 50};
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const std::pair<uint32_t, uint32_t> kChanceOfObfuscatingConstant = {10, 90};
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const std::pair<uint32_t, uint32_t> kChanceOfOutliningFunction = {10, 90};
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const std::pair<uint32_t, uint32_t> kChanceOfPermutingParameters = {30, 90};
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const std::pair<uint32_t, uint32_t> kChanceOfPushingIdThroughVariable = {5, 50};
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const std::pair<uint32_t, uint32_t> kChanceOfReplacingIdWithSynonym = {10, 90};
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const std::pair<uint32_t, uint32_t> kChanceOfSplittingBlock = {40, 95};
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const std::pair<uint32_t, uint32_t> kChanceOfTogglingAccessChainInstruction = {
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20, 90};
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// Default limits for various quantities that are chosen during fuzzing.
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// Keep them in alphabetical order.
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const uint32_t kDefaultMaxEquivalenceClassSizeForDataSynonymFactClosure = 1000;
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const uint32_t kDefaultMaxLoopControlPartialCount = 100;
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const uint32_t kDefaultMaxLoopControlPeelCount = 100;
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const uint32_t kDefaultMaxLoopLimit = 20;
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const uint32_t kDefaultMaxNewArraySizeLimit = 100;
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// Default functions for controlling how deep to go during recursive
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// generation/transformation. Keep them in alphabetical order.
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const std::function<bool(uint32_t, RandomGenerator*)>
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kDefaultGoDeeperInConstantObfuscation =
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[](uint32_t current_depth, RandomGenerator* random_generator) -> bool {
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double chance = 1.0 / std::pow(3.0, static_cast<float>(current_depth + 1));
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return random_generator->RandomDouble() < chance;
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};
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} // namespace
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FuzzerContext::FuzzerContext(RandomGenerator* random_generator,
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uint32_t min_fresh_id)
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: random_generator_(random_generator),
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next_fresh_id_(min_fresh_id),
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max_equivalence_class_size_for_data_synonym_fact_closure_(
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kDefaultMaxEquivalenceClassSizeForDataSynonymFactClosure),
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max_loop_control_partial_count_(kDefaultMaxLoopControlPartialCount),
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max_loop_control_peel_count_(kDefaultMaxLoopControlPeelCount),
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max_loop_limit_(kDefaultMaxLoopLimit),
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max_new_array_size_limit_(kDefaultMaxNewArraySizeLimit),
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go_deeper_in_constant_obfuscation_(
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kDefaultGoDeeperInConstantObfuscation) {
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chance_of_adding_access_chain_ =
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ChooseBetweenMinAndMax(kChanceOfAddingAccessChain);
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chance_of_adding_another_struct_field_ =
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ChooseBetweenMinAndMax(kChanceOfAddingAnotherStructField);
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chance_of_adding_array_or_struct_type_ =
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ChooseBetweenMinAndMax(kChanceOfAddingArrayOrStructType);
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chance_of_adding_dead_block_ =
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ChooseBetweenMinAndMax(kChanceOfAddingDeadBlock);
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chance_of_adding_dead_break_ =
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ChooseBetweenMinAndMax(kChanceOfAddingDeadBreak);
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chance_of_adding_dead_continue_ =
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ChooseBetweenMinAndMax(kChanceOfAddingDeadContinue);
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chance_of_adding_equation_instruction_ =
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ChooseBetweenMinAndMax(kChanceOfAddingEquationInstruction);
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chance_of_adding_global_variable_ =
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ChooseBetweenMinAndMax(kChanceOfAddingGlobalVariable);
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chance_of_adding_load_ = ChooseBetweenMinAndMax(kChanceOfAddingLoad);
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chance_of_adding_local_variable_ =
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ChooseBetweenMinAndMax(kChanceOfAddingLocalVariable);
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chance_of_adding_matrix_type_ =
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ChooseBetweenMinAndMax(kChanceOfAddingMatrixType);
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chance_of_adding_no_contraction_decoration_ =
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ChooseBetweenMinAndMax(kChanceOfAddingNoContractionDecoration);
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chance_of_adding_store_ = ChooseBetweenMinAndMax(kChanceOfAddingStore);
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chance_of_adding_vector_type_ =
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ChooseBetweenMinAndMax(kChanceOfAddingVectorType);
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chance_of_adjusting_branch_weights_ =
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ChooseBetweenMinAndMax(kChanceOfAdjustingBranchWeights);
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chance_of_adjusting_function_control_ =
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ChooseBetweenMinAndMax(kChanceOfAdjustingFunctionControl);
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chance_of_adjusting_loop_control_ =
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ChooseBetweenMinAndMax(kChanceOfAdjustingLoopControl);
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chance_of_adjusting_memory_operands_mask_ =
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ChooseBetweenMinAndMax(kChanceOfAdjustingMemoryOperandsMask);
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chance_of_adjusting_selection_control_ =
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ChooseBetweenMinAndMax(kChanceOfAdjustingSelectionControl);
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chance_of_calling_function_ =
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ChooseBetweenMinAndMax(kChanceOfCallingFunction);
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chance_of_choosing_struct_type_vs_array_type_ =
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ChooseBetweenMinAndMax(kChanceOfChoosingStructTypeVsArrayType);
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chance_of_constructing_composite_ =
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ChooseBetweenMinAndMax(kChanceOfConstructingComposite);
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chance_of_copying_object_ = ChooseBetweenMinAndMax(kChanceOfCopyingObject);
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chance_of_donating_additional_module_ =
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ChooseBetweenMinAndMax(kChanceOfDonatingAdditionalModule);
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chance_of_going_deeper_when_making_access_chain_ =
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ChooseBetweenMinAndMax(kChanceOfGoingDeeperWhenMakingAccessChain);
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chance_of_making_donor_livesafe_ =
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ChooseBetweenMinAndMax(kChanceOfMakingDonorLivesafe);
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chance_of_merging_blocks_ = ChooseBetweenMinAndMax(kChanceOfMergingBlocks);
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chance_of_moving_block_down_ =
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ChooseBetweenMinAndMax(kChanceOfMovingBlockDown);
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chance_of_obfuscating_constant_ =
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ChooseBetweenMinAndMax(kChanceOfObfuscatingConstant);
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chance_of_outlining_function_ =
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ChooseBetweenMinAndMax(kChanceOfOutliningFunction);
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chance_of_permuting_parameters_ =
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ChooseBetweenMinAndMax(kChanceOfPermutingParameters);
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chance_of_pushing_id_through_variable_ =
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ChooseBetweenMinAndMax(kChanceOfPushingIdThroughVariable);
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chance_of_replacing_id_with_synonym_ =
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ChooseBetweenMinAndMax(kChanceOfReplacingIdWithSynonym);
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chance_of_splitting_block_ = ChooseBetweenMinAndMax(kChanceOfSplittingBlock);
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chance_of_toggling_access_chain_instruction_ =
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ChooseBetweenMinAndMax(kChanceOfTogglingAccessChainInstruction);
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}
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FuzzerContext::~FuzzerContext() = default;
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uint32_t FuzzerContext::GetFreshId() { return next_fresh_id_++; }
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bool FuzzerContext::ChooseEven() { return random_generator_->RandomBool(); }
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bool FuzzerContext::ChoosePercentage(uint32_t percentage_chance) {
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assert(percentage_chance <= 100);
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return random_generator_->RandomPercentage() < percentage_chance;
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}
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uint32_t FuzzerContext::ChooseBetweenMinAndMax(
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const std::pair<uint32_t, uint32_t>& min_max) {
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assert(min_max.first <= min_max.second);
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return min_max.first +
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random_generator_->RandomUint32(min_max.second - min_max.first + 1);
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}
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} // namespace fuzz
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} // namespace spvtools
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