207 строки
9.1 KiB
C++
207 строки
9.1 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_apply_id_synonyms.h"
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#include "source/fuzz/data_descriptor.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/id_use_descriptor.h"
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#include "source/fuzz/instruction_descriptor.h"
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#include "source/fuzz/transformation_composite_extract.h"
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#include "source/fuzz/transformation_compute_data_synonym_fact_closure.h"
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#include "source/fuzz/transformation_replace_id_with_synonym.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassApplyIdSynonyms::FuzzerPassApplyIdSynonyms(
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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 FuzzerPassApplyIdSynonyms::Apply() {
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// Compute a closure of data synonym facts, to enrich the pool of synonyms
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// that are available.
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ApplyTransformation(TransformationComputeDataSynonymFactClosure(
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GetFuzzerContext()
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->GetMaximumEquivalenceClassSizeForDataSynonymFactClosure()));
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for (auto id_with_known_synonyms : GetTransformationContext()
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->GetFactManager()
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->GetIdsForWhichSynonymsAreKnown()) {
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// Gather up all uses of |id_with_known_synonym| as a regular id, and
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// subsequently iterate over these uses. We use this separation because,
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// when considering a given use, we might apply a transformation that will
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// invalidate the def-use manager.
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std::vector<std::pair<opt::Instruction*, uint32_t>> uses;
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GetIRContext()->get_def_use_mgr()->ForEachUse(
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id_with_known_synonyms,
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[&uses](opt::Instruction* use_inst, uint32_t use_index) -> void {
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// We only gather up regular id uses; e.g. we do not include a use of
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// the id as the scope for an atomic operation.
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if (use_inst->GetOperand(use_index).type == SPV_OPERAND_TYPE_ID) {
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uses.emplace_back(
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std::pair<opt::Instruction*, uint32_t>(use_inst, use_index));
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}
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});
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for (const auto& use : uses) {
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auto use_inst = use.first;
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auto use_index = use.second;
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auto block_containing_use = GetIRContext()->get_instr_block(use_inst);
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// The use might not be in a block; e.g. it could be a decoration.
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if (!block_containing_use) {
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continue;
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}
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfReplacingIdWithSynonym())) {
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continue;
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}
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// |use_index| is the absolute index of the operand. We require
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// the index of the operand restricted to input operands only.
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uint32_t use_in_operand_index =
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fuzzerutil::InOperandIndexFromOperandIndex(*use_inst, use_index);
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if (!fuzzerutil::IdUseCanBeReplaced(GetIRContext(),
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*GetTransformationContext(), use_inst,
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use_in_operand_index)) {
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continue;
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}
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std::vector<const protobufs::DataDescriptor*> synonyms_to_try;
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for (const auto* data_descriptor :
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GetTransformationContext()->GetFactManager()->GetSynonymsForId(
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id_with_known_synonyms)) {
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protobufs::DataDescriptor descriptor_for_this_id =
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MakeDataDescriptor(id_with_known_synonyms, {});
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if (DataDescriptorEquals()(data_descriptor, &descriptor_for_this_id)) {
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// Exclude the fact that the id is synonymous with itself.
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continue;
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}
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if (DataDescriptorsHaveCompatibleTypes(
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use_inst->opcode(), use_in_operand_index,
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descriptor_for_this_id, *data_descriptor)) {
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synonyms_to_try.push_back(data_descriptor);
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}
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}
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while (!synonyms_to_try.empty()) {
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auto synonym_to_try =
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GetFuzzerContext()->RemoveAtRandomIndex(&synonyms_to_try);
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// If the synonym's |index_size| is zero, the synonym represents an id.
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// Otherwise it represents some element of a composite structure, in
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// which case we need to be able to add an extract instruction to get
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// that element out.
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if (synonym_to_try->index_size() > 0 &&
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!fuzzerutil::CanInsertOpcodeBeforeInstruction(
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spv::Op::OpCompositeExtract, use_inst) &&
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use_inst->opcode() != spv::Op::OpPhi) {
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// We cannot insert an extract before this instruction, so this
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// synonym is no good.
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continue;
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}
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if (!fuzzerutil::IdIsAvailableAtUse(GetIRContext(), use_inst,
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use_in_operand_index,
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synonym_to_try->object())) {
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continue;
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}
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// We either replace the use with an id known to be synonymous (when
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// the synonym's |index_size| is 0), or an id that will hold the result
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// of extracting a synonym from a composite (when the synonym's
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// |index_size| is > 0).
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uint32_t id_with_which_to_replace_use;
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if (synonym_to_try->index_size() == 0) {
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id_with_which_to_replace_use = synonym_to_try->object();
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} else {
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id_with_which_to_replace_use = GetFuzzerContext()->GetFreshId();
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opt::Instruction* instruction_to_insert_before = nullptr;
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if (use_inst->opcode() != spv::Op::OpPhi) {
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instruction_to_insert_before = use_inst;
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} else {
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auto parent_block_id =
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use_inst->GetSingleWordInOperand(use_in_operand_index + 1);
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auto parent_block_instruction =
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GetIRContext()->get_def_use_mgr()->GetDef(parent_block_id);
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auto parent_block =
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GetIRContext()->get_instr_block(parent_block_instruction);
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instruction_to_insert_before = parent_block->GetMergeInst()
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? parent_block->GetMergeInst()
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: parent_block->terminator();
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}
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if (GetTransformationContext()->GetFactManager()->BlockIsDead(
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GetIRContext()
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->get_instr_block(instruction_to_insert_before)
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->id())) {
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// We cannot create a synonym via a composite extraction in a dead
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// block, as the resulting id is irrelevant.
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continue;
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}
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assert(!GetTransformationContext()->GetFactManager()->IdIsIrrelevant(
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synonym_to_try->object()) &&
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"Irrelevant ids can't participate in DataSynonym facts");
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ApplyTransformation(TransformationCompositeExtract(
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MakeInstructionDescriptor(GetIRContext(),
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instruction_to_insert_before),
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id_with_which_to_replace_use, synonym_to_try->object(),
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fuzzerutil::RepeatedFieldToVector(synonym_to_try->index())));
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assert(GetTransformationContext()->GetFactManager()->IsSynonymous(
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MakeDataDescriptor(id_with_which_to_replace_use, {}),
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*synonym_to_try) &&
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"The extracted id must be synonymous with the component from "
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"which it was extracted.");
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}
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ApplyTransformation(TransformationReplaceIdWithSynonym(
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MakeIdUseDescriptorFromUse(GetIRContext(), use_inst,
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use_in_operand_index),
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id_with_which_to_replace_use));
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break;
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}
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}
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}
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}
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bool FuzzerPassApplyIdSynonyms::DataDescriptorsHaveCompatibleTypes(
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spv::Op opcode, uint32_t use_in_operand_index,
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const protobufs::DataDescriptor& dd1,
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const protobufs::DataDescriptor& dd2) {
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auto base_object_type_id_1 =
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fuzzerutil::GetTypeId(GetIRContext(), dd1.object());
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auto base_object_type_id_2 =
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fuzzerutil::GetTypeId(GetIRContext(), dd2.object());
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assert(base_object_type_id_1 && base_object_type_id_2 &&
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"Data descriptors are invalid");
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auto type_id_1 = fuzzerutil::WalkCompositeTypeIndices(
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GetIRContext(), base_object_type_id_1, dd1.index());
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auto type_id_2 = fuzzerutil::WalkCompositeTypeIndices(
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GetIRContext(), base_object_type_id_2, dd2.index());
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assert(type_id_1 && type_id_2 && "Data descriptors have invalid types");
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return fuzzerutil::TypesAreCompatible(
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GetIRContext(), opcode, use_in_operand_index, type_id_1, type_id_2);
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}
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} // namespace fuzz
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} // namespace spvtools
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