mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-28 06:01:04 +00:00
f12c40f5a6
This fuzzer pass: For each zero-like constant, either finds the existing definition of the corresponding toggled one (OpConstantNull becomes zero-valued scalar OpConstant or vice versa) or creates a new one if it doesn't exist and records that the two are synonyms For each use of these constants, probabilistically decides whether to change it with the corresponding toggled constant id (as described in #3486 ) Only uses inside blocks of instructions are considered and not, for example, in instructions declaring other constants.
264 lines
13 KiB
C++
264 lines
13 KiB
C++
// 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_context.h"
|
|
|
|
#include <cmath>
|
|
|
|
namespace spvtools {
|
|
namespace fuzz {
|
|
|
|
namespace {
|
|
// Default <minimum, maximum> pairs of probabilities for applying various
|
|
// transformations. All values are percentages. Keep them in alphabetical order.
|
|
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingAccessChain = {5, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingAnotherStructField = {20,
|
|
90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingArrayOrStructType = {20, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingCopyMemory = {20, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingDeadBlock = {20, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingDeadBreak = {5, 80};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingDeadContinue = {5, 80};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingEquationInstruction = {5,
|
|
90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingGlobalVariable = {20, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingImageSampleUnusedComponents =
|
|
{20, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingLoad = {5, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingLocalVariable = {20, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingMatrixType = {20, 70};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingNoContractionDecoration = {
|
|
5, 70};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingParameters = {5, 70};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingStore = {5, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingSynonyms = {20, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingVectorType = {20, 70};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAddingVectorShuffle = {20, 70};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAdjustingBranchWeights = {20, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAdjustingFunctionControl = {20,
|
|
70};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAdjustingLoopControl = {20, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAdjustingMemoryOperandsMask = {20,
|
|
90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfAdjustingSelectionControl = {20,
|
|
90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfCallingFunction = {1, 10};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfChoosingStructTypeVsArrayType = {
|
|
20, 80};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfChoosingWorkgroupStorageClass = {
|
|
50, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfConstructingComposite = {20, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfCopyingObject = {20, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfDonatingAdditionalModule = {5, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfGoingDeeperWhenMakingAccessChain =
|
|
{50, 95};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfInterchangingZeroLikeConstants = {
|
|
10, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfInvertingComparisonOperators = {
|
|
20, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfMakingDonorLivesafe = {40, 60};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfMergingBlocks = {20, 95};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfMovingBlockDown = {20, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfObfuscatingConstant = {10, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfOutliningFunction = {10, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfPermutingParameters = {30, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfPermutingPhiOperands = {30, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfPushingIdThroughVariable = {5, 50};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfReplacingIdWithSynonym = {10, 90};
|
|
const std::pair<uint32_t, uint32_t>
|
|
kChanceOfReplacingLinearAlgebraInstructions = {10, 90};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfReplacingParametersWithGlobals = {
|
|
30, 70};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfSplittingBlock = {40, 95};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfSwappingConditionalBranchOperands =
|
|
{10, 70};
|
|
const std::pair<uint32_t, uint32_t> kChanceOfTogglingAccessChainInstruction = {
|
|
20, 90};
|
|
|
|
// Default limits for various quantities that are chosen during fuzzing.
|
|
// Keep them in alphabetical order.
|
|
const uint32_t kDefaultMaxEquivalenceClassSizeForDataSynonymFactClosure = 1000;
|
|
const uint32_t kDefaultMaxLoopControlPartialCount = 100;
|
|
const uint32_t kDefaultMaxLoopControlPeelCount = 100;
|
|
const uint32_t kDefaultMaxLoopLimit = 20;
|
|
const uint32_t kDefaultMaxNewArraySizeLimit = 100;
|
|
// TODO(https://github.com/KhronosGroup/SPIRV-Tools/issues/3424):
|
|
// think whether there is a better limit on the maximum number of parameters.
|
|
const uint32_t kDefaultMaxNumberOfFunctionParameters = 128;
|
|
const uint32_t kDefaultMaxNumberOfNewParameters = 15;
|
|
|
|
// Default functions for controlling how deep to go during recursive
|
|
// generation/transformation. Keep them in alphabetical order.
|
|
|
|
const std::function<bool(uint32_t, RandomGenerator*)>
|
|
kDefaultGoDeeperInConstantObfuscation =
|
|
[](uint32_t current_depth, RandomGenerator* random_generator) -> bool {
|
|
double chance = 1.0 / std::pow(3.0, static_cast<float>(current_depth + 1));
|
|
return random_generator->RandomDouble() < chance;
|
|
};
|
|
|
|
} // namespace
|
|
|
|
FuzzerContext::FuzzerContext(RandomGenerator* random_generator,
|
|
uint32_t min_fresh_id)
|
|
: random_generator_(random_generator),
|
|
next_fresh_id_(min_fresh_id),
|
|
max_equivalence_class_size_for_data_synonym_fact_closure_(
|
|
kDefaultMaxEquivalenceClassSizeForDataSynonymFactClosure),
|
|
max_loop_control_partial_count_(kDefaultMaxLoopControlPartialCount),
|
|
max_loop_control_peel_count_(kDefaultMaxLoopControlPeelCount),
|
|
max_loop_limit_(kDefaultMaxLoopLimit),
|
|
max_new_array_size_limit_(kDefaultMaxNewArraySizeLimit),
|
|
max_number_of_function_parameters_(kDefaultMaxNumberOfFunctionParameters),
|
|
max_number_of_new_parameters_(kDefaultMaxNumberOfNewParameters),
|
|
go_deeper_in_constant_obfuscation_(
|
|
kDefaultGoDeeperInConstantObfuscation) {
|
|
chance_of_adding_access_chain_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingAccessChain);
|
|
chance_of_adding_another_struct_field_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingAnotherStructField);
|
|
chance_of_adding_array_or_struct_type_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingArrayOrStructType);
|
|
chance_of_adding_copy_memory_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingCopyMemory);
|
|
chance_of_adding_dead_block_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingDeadBlock);
|
|
chance_of_adding_dead_break_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingDeadBreak);
|
|
chance_of_adding_dead_continue_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingDeadContinue);
|
|
chance_of_adding_equation_instruction_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingEquationInstruction);
|
|
chance_of_adding_global_variable_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingGlobalVariable);
|
|
chance_of_adding_load_ = ChooseBetweenMinAndMax(kChanceOfAddingLoad);
|
|
chance_of_adding_image_sample_unused_components_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingImageSampleUnusedComponents);
|
|
chance_of_adding_local_variable_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingLocalVariable);
|
|
chance_of_adding_matrix_type_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingMatrixType);
|
|
chance_of_adding_no_contraction_decoration_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingNoContractionDecoration);
|
|
chance_of_adding_parameters =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingParameters);
|
|
chance_of_adding_store_ = ChooseBetweenMinAndMax(kChanceOfAddingStore);
|
|
chance_of_adding_vector_shuffle_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingVectorShuffle);
|
|
chance_of_adding_vector_type_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAddingVectorType);
|
|
chance_of_adjusting_branch_weights_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAdjustingBranchWeights);
|
|
chance_of_adjusting_function_control_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAdjustingFunctionControl);
|
|
chance_of_adding_synonyms_ = ChooseBetweenMinAndMax(kChanceOfAddingSynonyms);
|
|
chance_of_adjusting_loop_control_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAdjustingLoopControl);
|
|
chance_of_adjusting_memory_operands_mask_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAdjustingMemoryOperandsMask);
|
|
chance_of_adjusting_selection_control_ =
|
|
ChooseBetweenMinAndMax(kChanceOfAdjustingSelectionControl);
|
|
chance_of_calling_function_ =
|
|
ChooseBetweenMinAndMax(kChanceOfCallingFunction);
|
|
chance_of_choosing_struct_type_vs_array_type_ =
|
|
ChooseBetweenMinAndMax(kChanceOfChoosingStructTypeVsArrayType);
|
|
chance_of_choosing_workgroup_storage_class_ =
|
|
ChooseBetweenMinAndMax(kChanceOfChoosingWorkgroupStorageClass);
|
|
chance_of_constructing_composite_ =
|
|
ChooseBetweenMinAndMax(kChanceOfConstructingComposite);
|
|
chance_of_copying_object_ = ChooseBetweenMinAndMax(kChanceOfCopyingObject);
|
|
chance_of_donating_additional_module_ =
|
|
ChooseBetweenMinAndMax(kChanceOfDonatingAdditionalModule);
|
|
chance_of_going_deeper_when_making_access_chain_ =
|
|
ChooseBetweenMinAndMax(kChanceOfGoingDeeperWhenMakingAccessChain);
|
|
chance_of_interchanging_zero_like_constants_ =
|
|
ChooseBetweenMinAndMax(kChanceOfInterchangingZeroLikeConstants);
|
|
chance_of_inverting_comparison_operators_ =
|
|
ChooseBetweenMinAndMax(kChanceOfInvertingComparisonOperators);
|
|
chance_of_making_donor_livesafe_ =
|
|
ChooseBetweenMinAndMax(kChanceOfMakingDonorLivesafe);
|
|
chance_of_merging_blocks_ = ChooseBetweenMinAndMax(kChanceOfMergingBlocks);
|
|
chance_of_moving_block_down_ =
|
|
ChooseBetweenMinAndMax(kChanceOfMovingBlockDown);
|
|
chance_of_obfuscating_constant_ =
|
|
ChooseBetweenMinAndMax(kChanceOfObfuscatingConstant);
|
|
chance_of_outlining_function_ =
|
|
ChooseBetweenMinAndMax(kChanceOfOutliningFunction);
|
|
chance_of_permuting_parameters_ =
|
|
ChooseBetweenMinAndMax(kChanceOfPermutingParameters);
|
|
chance_of_permuting_phi_operands_ =
|
|
ChooseBetweenMinAndMax(kChanceOfPermutingPhiOperands);
|
|
chance_of_pushing_id_through_variable_ =
|
|
ChooseBetweenMinAndMax(kChanceOfPushingIdThroughVariable);
|
|
chance_of_replacing_id_with_synonym_ =
|
|
ChooseBetweenMinAndMax(kChanceOfReplacingIdWithSynonym);
|
|
chance_of_replacing_linear_algebra_instructions_ =
|
|
ChooseBetweenMinAndMax(kChanceOfReplacingLinearAlgebraInstructions);
|
|
chance_of_replacing_parameters_with_globals_ =
|
|
ChooseBetweenMinAndMax(kChanceOfReplacingParametersWithGlobals);
|
|
chance_of_splitting_block_ = ChooseBetweenMinAndMax(kChanceOfSplittingBlock);
|
|
chance_of_swapping_conditional_branch_operands_ =
|
|
ChooseBetweenMinAndMax(kChanceOfSwappingConditionalBranchOperands);
|
|
chance_of_toggling_access_chain_instruction_ =
|
|
ChooseBetweenMinAndMax(kChanceOfTogglingAccessChainInstruction);
|
|
}
|
|
|
|
FuzzerContext::~FuzzerContext() = default;
|
|
|
|
uint32_t FuzzerContext::GetFreshId() { return next_fresh_id_++; }
|
|
|
|
std::vector<uint32_t> FuzzerContext::GetFreshIds(const uint32_t count) {
|
|
std::vector<uint32_t> fresh_ids(count);
|
|
|
|
for (uint32_t& fresh_id : fresh_ids) {
|
|
fresh_id = next_fresh_id_++;
|
|
}
|
|
|
|
return fresh_ids;
|
|
}
|
|
|
|
bool FuzzerContext::ChooseEven() { return random_generator_->RandomBool(); }
|
|
|
|
bool FuzzerContext::ChoosePercentage(uint32_t percentage_chance) {
|
|
assert(percentage_chance <= 100);
|
|
return random_generator_->RandomPercentage() < percentage_chance;
|
|
}
|
|
|
|
uint32_t FuzzerContext::ChooseBetweenMinAndMax(
|
|
const std::pair<uint32_t, uint32_t>& min_max) {
|
|
assert(min_max.first <= min_max.second);
|
|
return min_max.first +
|
|
random_generator_->RandomUint32(min_max.second - min_max.first + 1);
|
|
}
|
|
|
|
protobufs::TransformationAddSynonym::SynonymType
|
|
FuzzerContext::GetRandomSynonymType() {
|
|
// value_count method is guaranteed to return a value greater than 0.
|
|
auto result_index = ChooseBetweenMinAndMax(
|
|
{0, static_cast<uint32_t>(
|
|
protobufs::TransformationAddSynonym::SynonymType_descriptor()
|
|
->value_count() -
|
|
1)});
|
|
auto result = protobufs::TransformationAddSynonym::SynonymType_descriptor()
|
|
->value(result_index)
|
|
->number();
|
|
assert(protobufs::TransformationAddSynonym::SynonymType_IsValid(result) &&
|
|
"|result| is not a value of SynonymType");
|
|
return static_cast<protobufs::TransformationAddSynonym::SynonymType>(result);
|
|
}
|
|
|
|
} // namespace fuzz
|
|
} // namespace spvtools
|