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https://github.com/KhronosGroup/SPIRV-Tools
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fac166162f
At present, TransformationReplaceIdWithSynonym both extracts elements from composite objects and replaces uses of ids with synonyms. This new TransformationCompositeExtract class will allow that transformation to be broken into smaller transformations.
124 lines
4.5 KiB
C++
124 lines
4.5 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/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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// 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), 1);
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protobufs::DataDescriptor data_descriptor_for_result_id =
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MakeDataDescriptor(message_.fresh_id(), {}, 1);
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fact_manager->AddFactDataSynonym(data_descriptor_for_extracted_element,
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data_descriptor_for_result_id);
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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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