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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.
82 lines
3.1 KiB
C++
82 lines
3.1 KiB
C++
// Copyright (c) 2020 Vasyl Teliman
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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_add_copy_memory.h"
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#include "source/fuzz/fuzzer_context.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/instruction_descriptor.h"
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#include "source/fuzz/transformation_add_copy_memory.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassAddCopyMemory::FuzzerPassAddCopyMemory(
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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 FuzzerPassAddCopyMemory::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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// Check that we can insert an OpCopyMemory before this instruction.
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if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpCopyMemory,
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inst_it)) {
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return;
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}
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfAddingCopyMemory())) {
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return;
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}
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// Get all instructions available before |inst_it| according to the
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// domination rules.
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auto instructions = FindAvailableInstructions(
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function, block, inst_it,
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TransformationAddCopyMemory::IsInstructionSupported);
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if (instructions.empty()) {
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return;
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}
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const auto* inst =
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instructions[GetFuzzerContext()->RandomIndex(instructions)];
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// Decide whether to create global or local variable.
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auto storage_class = GetFuzzerContext()->ChooseEven()
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? SpvStorageClassPrivate
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: SpvStorageClassFunction;
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auto pointee_type_id = fuzzerutil::GetPointeeTypeIdFromPointerType(
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GetIRContext(), inst->type_id());
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// Create a pointer type with |storage_class| if needed.
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FindOrCreatePointerType(pointee_type_id, storage_class);
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ApplyTransformation(TransformationAddCopyMemory(
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instruction_descriptor, GetFuzzerContext()->GetFreshId(),
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inst->result_id(), storage_class,
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FindOrCreateZeroConstant(pointee_type_id, false)));
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});
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}
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} // namespace fuzz
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} // namespace spvtools
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