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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.
#ifndef SOURCE_FUZZ_FUZZER_CONTEXT_H_
#define SOURCE_FUZZ_FUZZER_CONTEXT_H_
#include <functional>
#include <utility>
#include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
#include "source/fuzz/random_generator.h"
#include "source/opt/function.h"
namespace spvtools {
namespace fuzz {
// Encapsulates all parameters that control the fuzzing process, such as the
// source of randomness and the probabilities with which transformations are
// applied.
class FuzzerContext {
public:
// Constructs a fuzzer context with a given random generator and the minimum
// value that can be used for fresh ids.
FuzzerContext(RandomGenerator* random_generator, uint32_t min_fresh_id);
~FuzzerContext();
// Returns a random boolean.
bool ChooseEven();
// Returns true if and only if a randomly-chosen integer in the range [0, 100]
// is less than |percentage_chance|.
bool ChoosePercentage(uint32_t percentage_chance);
// Returns a random index into |sequence|, which is expected to have a 'size'
// method, and which must be non-empty. Typically 'HasSizeMethod' will be an
// std::vector.
template <typename HasSizeMethod>
uint32_t RandomIndex(const HasSizeMethod& sequence) const {
assert(sequence.size() > 0);
return random_generator_->RandomUint32(
static_cast<uint32_t>(sequence.size()));
}
// Selects a random index into |sequence|, removes the element at that index
// and returns it.
template <typename T>
T RemoveAtRandomIndex(std::vector<T>* sequence) const {
uint32_t index = RandomIndex(*sequence);
T result = sequence->at(index);
sequence->erase(sequence->begin() + index);
return result;
}
// Randomly shuffles a |sequence| between |lo| and |hi| indices inclusively.
// |lo| and |hi| must be valid indices to the |sequence|
template <typename T>
void Shuffle(std::vector<T>* sequence, size_t lo, size_t hi) const {
auto& array = *sequence;
if (array.empty()) {
return;
}
assert(lo <= hi && hi < array.size() && "lo and/or hi indices are invalid");
// i > lo to account for potential infinite loop when lo == 0
for (size_t i = hi; i > lo; --i) {
auto index =
random_generator_->RandomUint32(static_cast<uint32_t>(i - lo + 1));
if (lo + index != i) {
// Introduce std::swap to the scope but don't use it
// directly since there might be a better overload
using std::swap;
swap(array[lo + index], array[i]);
}
}
}
// Ramdomly shuffles a |sequence|
template <typename T>
void Shuffle(std::vector<T>* sequence) const {
if (!sequence->empty()) {
Shuffle(sequence, 0, sequence->size() - 1);
}
}
// Yields an id that is guaranteed not to be used in the module being fuzzed,
// or to have been issued before.
uint32_t GetFreshId();
// Returns a vector of |count| fresh ids.
std::vector<uint32_t> GetFreshIds(const uint32_t count);
// Probabilities associated with applying various transformations.
// Keep them in alphabetical order.
uint32_t GetChanceOfAddingAccessChain() {
return chance_of_adding_access_chain_;
}
uint32_t GetChanceOfAddingAnotherStructField() {
return chance_of_adding_another_struct_field_;
}
uint32_t GetChanceOfAddingArrayOrStructType() {
return chance_of_adding_array_or_struct_type_;
}
uint32_t GetChanceOfAddingCopyMemory() {
return chance_of_adding_copy_memory_;
}
uint32_t GetChanceOfAddingDeadBlock() { return chance_of_adding_dead_block_; }
uint32_t GetChanceOfAddingDeadBreak() { return chance_of_adding_dead_break_; }
uint32_t GetChanceOfAddingDeadContinue() {
return chance_of_adding_dead_continue_;
}
uint32_t GetChanceOfAddingEquationInstruction() {
return chance_of_adding_equation_instruction_;
}
uint32_t GetChanceOfAddingGlobalVariable() {
return chance_of_adding_global_variable_;
}
uint32_t GetChanceOfAddingImageSampleUnusedComponents() {
return chance_of_adding_image_sample_unused_components_;
}
uint32_t GetChanceOfAddingLoad() { return chance_of_adding_load_; }
uint32_t GetChanceOfAddingLocalVariable() {
return chance_of_adding_local_variable_;
}
uint32_t GetChanceOfAddingMatrixType() {
return chance_of_adding_matrix_type_;
}
uint32_t GetChanceOfAddingNoContractionDecoration() {
return chance_of_adding_no_contraction_decoration_;
}
uint32_t GetChanceOfAddingParameters() { return chance_of_adding_parameters; }
uint32_t GetChanceOfAddingRelaxedDecoration() {
return chance_of_adding_relaxed_decoration_;
}
uint32_t GetChanceOfAddingStore() { return chance_of_adding_store_; }
uint32_t GetChanceOfAddingSynonyms() { return chance_of_adding_synonyms_; }
uint32_t GetChanceOfAddingVectorShuffle() {
return chance_of_adding_vector_shuffle_;
}
uint32_t GetChanceOfAddingVectorType() {
return chance_of_adding_vector_type_;
}
uint32_t GetChanceOfAdjustingBranchWeights() {
return chance_of_adjusting_branch_weights_;
}
uint32_t GetChanceOfAdjustingFunctionControl() {
return chance_of_adjusting_function_control_;
}
uint32_t GetChanceOfAdjustingLoopControl() {
return chance_of_adjusting_loop_control_;
}
uint32_t GetChanceOfAdjustingMemoryOperandsMask() {
return chance_of_adjusting_memory_operands_mask_;
}
uint32_t GetChanceOfAdjustingSelectionControl() {
return chance_of_adjusting_selection_control_;
}
uint32_t GetChanceOfCallingFunction() { return chance_of_calling_function_; }
uint32_t GetChanceOfChoosingStructTypeVsArrayType() {
return chance_of_choosing_struct_type_vs_array_type_;
}
uint32_t GetChanceOfChoosingWorkgroupStorageClass() {
return chance_of_choosing_workgroup_storage_class_;
}
uint32_t GetChanceOfConstructingComposite() {
return chance_of_constructing_composite_;
}
uint32_t GetChanceOfCopyingObject() { return chance_of_copying_object_; }
uint32_t GetChanceOfDonatingAdditionalModule() {
return chance_of_donating_additional_module_;
}
uint32_t GetChanceOfGoingDeeperWhenMakingAccessChain() {
return chance_of_going_deeper_when_making_access_chain_;
}
uint32_t GetChanceOfInterchangingSignednessOfIntegerOperands() {
return chance_of_interchanging_signedness_of_integer_operands_;
}
uint32_t GetChanceOfInterchangingZeroLikeConstants() {
return chance_of_interchanging_zero_like_constants_;
}
uint32_t GetChanceOfInvertingComparisonOperators() {
return chance_of_inverting_comparison_operators_;
}
uint32_t ChanceOfMakingDonorLivesafe() {
return chance_of_making_donor_livesafe_;
}
uint32_t GetChanceOfMakingVectorOperationDynamic() {
return chance_of_making_vector_operation_dynamic_;
}
uint32_t GetChanceOfMergingBlocks() { return chance_of_merging_blocks_; }
uint32_t GetChanceOfMovingBlockDown() { return chance_of_moving_block_down_; }
uint32_t GetChanceOfObfuscatingConstant() {
return chance_of_obfuscating_constant_;
}
uint32_t GetChanceOfOutliningFunction() {
return chance_of_outlining_function_;
}
uint32_t GetChanceOfPermutingInstructions() {
return chance_of_permuting_instructions_;
}
uint32_t GetChanceOfPermutingParameters() {
return chance_of_permuting_parameters_;
}
uint32_t GetChanceOfPermutingPhiOperands() {
return chance_of_permuting_phi_operands_;
}
uint32_t GetChanceOfPropagatingInstructionsUp() {
return chance_of_propagating_instructions_up_;
}
uint32_t GetChanceOfPushingIdThroughVariable() {
return chance_of_pushing_id_through_variable_;
}
uint32_t GetChanceOfReplacingAddSubMulWithCarryingExtended() {
return chance_of_replacing_add_sub_mul_with_carrying_extended_;
}
uint32_t GetChanceOfReplacingCopyMemoryWithLoadStore() {
return chance_of_replacing_copy_memory_with_load_store_;
}
uint32_t GetChanceOfReplacingCopyObjectWithStoreLoad() {
return chance_of_replacing_copyobject_with_store_load_;
}
uint32_t GetChanceOfReplacingIdWithSynonym() {
return chance_of_replacing_id_with_synonym_;
}
uint32_t GetChanceOfReplacingLinearAlgebraInstructions() {
return chance_of_replacing_linear_algebra_instructions_;
}
uint32_t GetChanceOfReplacingLoadStoreWithCopyMemory() {
return chance_of_replacing_load_store_with_copy_memory_;
}
uint32_t GetChanceOfReplacingParametersWithGlobals() {
return chance_of_replacing_parameters_with_globals_;
}
uint32_t GetChanceOfReplacingParametersWithStruct() {
return chance_of_replacing_parameters_with_struct_;
}
uint32_t GetChanceOfSplittingBlock() { return chance_of_splitting_block_; }
uint32_t GetChanceOfSwappingConditionalBranchOperands() {
return chance_of_swapping_conditional_branch_operands_;
}
uint32_t GetChanceOfTogglingAccessChainInstruction() {
return chance_of_toggling_access_chain_instruction_;
}
// Other functions to control transformations. Keep them in alphabetical
// order.
uint32_t GetMaximumEquivalenceClassSizeForDataSynonymFactClosure() {
return max_equivalence_class_size_for_data_synonym_fact_closure_;
}
uint32_t GetMaximumNumberOfFunctionParameters() {
return max_number_of_function_parameters_;
}
uint32_t GetMaximumNumberOfParametersReplacedWithStruct() {
return max_number_of_parameters_replaced_with_struct_;
}
std::pair<uint32_t, uint32_t> GetRandomBranchWeights() {
std::pair<uint32_t, uint32_t> branch_weights = {0, 0};
while (branch_weights.first == 0 && branch_weights.second == 0) {
// Using INT32_MAX to do not overflow UINT32_MAX when the branch weights
// are added together.
branch_weights.first = random_generator_->RandomUint32(INT32_MAX);
branch_weights.second = random_generator_->RandomUint32(INT32_MAX);
}
return branch_weights;
}
std::vector<uint32_t> GetRandomComponentsForVectorShuffle(
uint32_t max_component_index) {
// Component count must be in range [2, 4].
std::vector<uint32_t> components(random_generator_->RandomUint32(2) + 2);
for (uint32_t& component : components) {
component = random_generator_->RandomUint32(max_component_index);
}
return components;
}
uint32_t GetRandomIndexForAccessChain(uint32_t composite_size_bound) {
return random_generator_->RandomUint32(composite_size_bound);
}
uint32_t GetRandomLoopControlPartialCount() {
return random_generator_->RandomUint32(max_loop_control_partial_count_);
}
uint32_t GetRandomLoopControlPeelCount() {
return random_generator_->RandomUint32(max_loop_control_peel_count_);
}
uint32_t GetRandomLoopLimit() {
return random_generator_->RandomUint32(max_loop_limit_);
}
uint32_t GetRandomNumberOfNewParameters(uint32_t num_of_params) {
assert(num_of_params < GetMaximumNumberOfFunctionParameters());
return ChooseBetweenMinAndMax(
{1, std::min(max_number_of_new_parameters_,
GetMaximumNumberOfFunctionParameters() - num_of_params)});
}
uint32_t GetRandomNumberOfParametersReplacedWithStruct(uint32_t num_params) {
assert(num_params != 0 && "A function must have parameters to replace");
return ChooseBetweenMinAndMax(
{1, std::min(num_params,
GetMaximumNumberOfParametersReplacedWithStruct())});
}
uint32_t GetRandomSizeForNewArray() {
// Ensure that the array size is non-zero.
return random_generator_->RandomUint32(max_new_array_size_limit_ - 1) + 1;
}
protobufs::TransformationAddSynonym::SynonymType GetRandomSynonymType();
uint32_t GetRandomUnusedComponentCountForImageSample(
uint32_t max_unused_component_count) {
// Ensure that the number of unused components is non-zero.
return random_generator_->RandomUint32(max_unused_component_count) + 1;
}
bool GoDeeperInConstantObfuscation(uint32_t depth) {
return go_deeper_in_constant_obfuscation_(depth, random_generator_);
}
private:
// The source of randomness.
RandomGenerator* random_generator_;
// The next fresh id to be issued.
uint32_t next_fresh_id_;
// Probabilities associated with applying various transformations.
// Keep them in alphabetical order.
uint32_t chance_of_adding_access_chain_;
uint32_t chance_of_adding_another_struct_field_;
uint32_t chance_of_adding_array_or_struct_type_;
uint32_t chance_of_adding_copy_memory_;
uint32_t chance_of_adding_dead_block_;
uint32_t chance_of_adding_dead_break_;
uint32_t chance_of_adding_dead_continue_;
uint32_t chance_of_adding_equation_instruction_;
uint32_t chance_of_adding_global_variable_;
uint32_t chance_of_adding_image_sample_unused_components_;
uint32_t chance_of_adding_load_;
uint32_t chance_of_adding_local_variable_;
uint32_t chance_of_adding_matrix_type_;
uint32_t chance_of_adding_no_contraction_decoration_;
uint32_t chance_of_adding_parameters;
uint32_t chance_of_adding_relaxed_decoration_;
uint32_t chance_of_adding_store_;
uint32_t chance_of_adding_synonyms_;
uint32_t chance_of_adding_vector_shuffle_;
uint32_t chance_of_adding_vector_type_;
uint32_t chance_of_adjusting_branch_weights_;
uint32_t chance_of_adjusting_function_control_;
uint32_t chance_of_adjusting_loop_control_;
uint32_t chance_of_adjusting_memory_operands_mask_;
uint32_t chance_of_adjusting_selection_control_;
uint32_t chance_of_calling_function_;
uint32_t chance_of_choosing_struct_type_vs_array_type_;
uint32_t chance_of_choosing_workgroup_storage_class_;
uint32_t chance_of_constructing_composite_;
uint32_t chance_of_copying_object_;
uint32_t chance_of_donating_additional_module_;
uint32_t chance_of_going_deeper_when_making_access_chain_;
uint32_t chance_of_interchanging_signedness_of_integer_operands_;
uint32_t chance_of_interchanging_zero_like_constants_;
uint32_t chance_of_inverting_comparison_operators_;
uint32_t chance_of_making_donor_livesafe_;
uint32_t chance_of_making_vector_operation_dynamic_;
uint32_t chance_of_merging_blocks_;
uint32_t chance_of_moving_block_down_;
uint32_t chance_of_obfuscating_constant_;
uint32_t chance_of_outlining_function_;
uint32_t chance_of_permuting_instructions_;
uint32_t chance_of_permuting_parameters_;
uint32_t chance_of_permuting_phi_operands_;
uint32_t chance_of_propagating_instructions_up_;
uint32_t chance_of_pushing_id_through_variable_;
uint32_t chance_of_replacing_add_sub_mul_with_carrying_extended_;
uint32_t chance_of_replacing_copy_memory_with_load_store_;
uint32_t chance_of_replacing_copyobject_with_store_load_;
uint32_t chance_of_replacing_id_with_synonym_;
uint32_t chance_of_replacing_linear_algebra_instructions_;
uint32_t chance_of_replacing_load_store_with_copy_memory_;
uint32_t chance_of_replacing_parameters_with_globals_;
uint32_t chance_of_replacing_parameters_with_struct_;
uint32_t chance_of_splitting_block_;
uint32_t chance_of_swapping_conditional_branch_operands_;
uint32_t chance_of_toggling_access_chain_instruction_;
// Limits associated with various quantities for which random values are
// chosen during fuzzing.
// Keep them in alphabetical order.
uint32_t max_equivalence_class_size_for_data_synonym_fact_closure_;
uint32_t max_loop_control_partial_count_;
uint32_t max_loop_control_peel_count_;
uint32_t max_loop_limit_;
uint32_t max_new_array_size_limit_;
uint32_t max_number_of_function_parameters_;
uint32_t max_number_of_new_parameters_;
uint32_t max_number_of_parameters_replaced_with_struct_;
// Functions to determine with what probability to go deeper when generating
// or mutating constructs recursively.
const std::function<bool(uint32_t, RandomGenerator*)>&
go_deeper_in_constant_obfuscation_;
// Requires |min_max.first| <= |min_max.second|, and returns a value in the
// range [ |min_max.first|, |min_max.second| ]
uint32_t ChooseBetweenMinAndMax(const std::pair<uint32_t, uint32_t>& min_max);
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_FUZZER_CONTEXT_H_