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https://github.com/KhronosGroup/SPIRV-Tools
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fe10239f92
This change adds fuzzer passes that sprinkle loads and stores into a module at random, with stores restricted to occur in either dead blocks, or to use pointers for which it is known that the pointee value does not influence the module's overall behaviour. The change also generalises the VariableValueIsArbitrary fact to PointeeValueIsIrrelevant, to allow stores through access chains or object copies of variables whose values are known to be irrelevant. The change includes some other minor refactorings.
77 lines
3.0 KiB
C++
77 lines
3.0 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_copy_objects.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/transformation_copy_object.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassCopyObjects::FuzzerPassCopyObjects(
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opt::IRContext* ir_context, FactManager* fact_manager,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations)
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: FuzzerPass(ir_context, fact_manager, fuzzer_context, transformations) {}
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FuzzerPassCopyObjects::~FuzzerPassCopyObjects() = default;
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void FuzzerPassCopyObjects::Apply() {
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MaybeAddTransformationBeforeEachInstruction(
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[this](const opt::Function& function, opt::BasicBlock* block,
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opt::BasicBlock::iterator inst_it,
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const protobufs::InstructionDescriptor& instruction_descriptor)
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-> void {
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assert(inst_it->opcode() ==
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instruction_descriptor.target_instruction_opcode() &&
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"The opcode of the instruction we might insert before must be "
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"the same as the opcode in the descriptor for the instruction");
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// Check whether it is legitimate to insert a copy before this
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// instruction.
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if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpCopyObject,
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inst_it)) {
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return;
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}
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// Randomly decide whether to try inserting an object copy here.
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfCopyingObject())) {
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return;
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}
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std::vector<opt::Instruction*> relevant_instructions =
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FindAvailableInstructions(function, block, inst_it,
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fuzzerutil::CanMakeSynonymOf);
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// At this point, |relevant_instructions| contains all the instructions
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// we might think of copying.
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if (relevant_instructions.empty()) {
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return;
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}
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// Choose a copyable instruction at random, and create and apply an
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// object copying transformation based on it.
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ApplyTransformation(TransformationCopyObject(
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relevant_instructions[GetFuzzerContext()->RandomIndex(
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relevant_instructions)]
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->result_id(),
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instruction_descriptor, GetFuzzerContext()->GetFreshId()));
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});
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}
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} // namespace fuzz
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} // namespace spvtools
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