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https://github.com/KhronosGroup/SPIRV-Tools
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9c4481419e
spirv-fuzz features transformations that should be applicable by construction. Assertions are used to detect when such transformations turn out to be inapplicable. Failures of such assertions indicate bugs in the fuzzer. However, when using the fuzzer at scale (e.g. in ClusterFuzz) reports of these assertion failures create noise, and cause the fuzzer to exit early. This change adds an option whereby inapplicable transformations can be ignored. This reduces noise and allows fuzzing to continue even when a transformation that should be applicable but is not has been erroneously created.
89 lines
3.5 KiB
C++
89 lines
3.5 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/protobufs/spirvfuzz_protobufs.h"
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#include "source/fuzz/transformation_add_synonym.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, 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 FuzzerPassCopyObjects::Apply() {
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ForEachInstructionWithInstructionDescriptor(
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[this](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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if (GetTransformationContext()->GetFactManager()->BlockIsDead(
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block->id())) {
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// Don't create synonyms in dead blocks.
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return;
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}
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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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const auto relevant_instructions = FindAvailableInstructions(
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function, block, inst_it,
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[this](opt::IRContext* ir_context, opt::Instruction* inst) {
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return TransformationAddSynonym::IsInstructionValid(
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ir_context, *GetTransformationContext(), inst,
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protobufs::TransformationAddSynonym::COPY_OBJECT);
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});
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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(TransformationAddSynonym(
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relevant_instructions[GetFuzzerContext()->RandomIndex(
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relevant_instructions)]
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->result_id(),
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protobufs::TransformationAddSynonym::COPY_OBJECT,
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GetFuzzerContext()->GetFreshId(), instruction_descriptor));
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});
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}
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} // namespace fuzz
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} // namespace spvtools
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