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https://github.com/KhronosGroup/SPIRV-Tools
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3724cfbea8
When a data synonym fact about two composites is added, data synonym facts between all sub-components of the composites are also added. Furthermore, when data synonym facts been all sub-components of two composites are known, a data synonym fact relating the two composites is added. Identification of this case is done in a lazy manner, when questions about data synonym facts are asked. The change introduces helper methods to get the size of an array type and the number of elements of a struct type, and fixes TransformationCompositeExtract to invalidate analyses appropriately.
126 lines
4.6 KiB
C++
126 lines
4.6 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/transformation_composite_extract.h"
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#include <vector>
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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/instruction_descriptor.h"
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namespace spvtools {
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namespace fuzz {
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TransformationCompositeExtract::TransformationCompositeExtract(
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const spvtools::fuzz::protobufs::TransformationCompositeExtract& message)
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: message_(message) {}
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TransformationCompositeExtract::TransformationCompositeExtract(
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const protobufs::InstructionDescriptor& instruction_to_insert_before,
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uint32_t fresh_id, uint32_t composite_id, std::vector<uint32_t>&& index) {
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*message_.mutable_instruction_to_insert_before() =
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instruction_to_insert_before;
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message_.set_fresh_id(fresh_id);
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message_.set_composite_id(composite_id);
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for (auto an_index : index) {
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message_.add_index(an_index);
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}
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}
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bool TransformationCompositeExtract::IsApplicable(
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opt::IRContext* context,
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const spvtools::fuzz::FactManager& /*unused*/) const {
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if (!fuzzerutil::IsFreshId(context, message_.fresh_id())) {
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return false;
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}
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auto instruction_to_insert_before =
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FindInstruction(message_.instruction_to_insert_before(), context);
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if (!instruction_to_insert_before) {
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return false;
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}
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auto composite_instruction =
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context->get_def_use_mgr()->GetDef(message_.composite_id());
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if (!composite_instruction) {
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return false;
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}
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if (auto block = context->get_instr_block(composite_instruction)) {
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if (composite_instruction == instruction_to_insert_before ||
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!context->GetDominatorAnalysis(block->GetParent())
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->Dominates(composite_instruction, instruction_to_insert_before)) {
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return false;
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}
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}
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assert(composite_instruction->type_id() &&
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"An instruction in a block cannot have a result id but no type id.");
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auto composite_type =
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context->get_type_mgr()->GetType(composite_instruction->type_id());
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if (!composite_type) {
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return false;
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}
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if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(
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SpvOpCompositeExtract, instruction_to_insert_before)) {
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return false;
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}
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return fuzzerutil::WalkCompositeTypeIndices(
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context, composite_instruction->type_id(), message_.index()) != 0;
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}
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void TransformationCompositeExtract::Apply(
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opt::IRContext* context, spvtools::fuzz::FactManager* fact_manager) const {
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opt::Instruction::OperandList extract_operands;
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extract_operands.push_back({SPV_OPERAND_TYPE_ID, {message_.composite_id()}});
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for (auto an_index : message_.index()) {
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extract_operands.push_back({SPV_OPERAND_TYPE_LITERAL_INTEGER, {an_index}});
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}
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auto composite_instruction =
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context->get_def_use_mgr()->GetDef(message_.composite_id());
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auto extracted_type = fuzzerutil::WalkCompositeTypeIndices(
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context, composite_instruction->type_id(), message_.index());
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FindInstruction(message_.instruction_to_insert_before(), context)
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->InsertBefore(MakeUnique<opt::Instruction>(
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context, SpvOpCompositeExtract, extracted_type, message_.fresh_id(),
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extract_operands));
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fuzzerutil::UpdateModuleIdBound(context, message_.fresh_id());
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context->InvalidateAnalysesExceptFor(opt::IRContext::Analysis::kAnalysisNone);
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// Add the fact that the id storing the extracted element is synonymous with
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// the index into the structure.
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std::vector<uint32_t> indices;
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for (auto an_index : message_.index()) {
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indices.push_back(an_index);
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}
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protobufs::DataDescriptor data_descriptor_for_extracted_element =
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MakeDataDescriptor(message_.composite_id(), std::move(indices));
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protobufs::DataDescriptor data_descriptor_for_result_id =
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MakeDataDescriptor(message_.fresh_id(), {});
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fact_manager->AddFactDataSynonym(data_descriptor_for_extracted_element,
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data_descriptor_for_result_id, context);
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}
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protobufs::Transformation TransformationCompositeExtract::ToMessage() const {
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protobufs::Transformation result;
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*result.mutable_composite_extract() = message_;
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return result;
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}
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} // namespace fuzz
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} // namespace spvtools
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