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// Copyright (c) 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "source/fuzz/transformation_composite_extract.h"
#include <vector>
#include "source/fuzz/data_descriptor.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
namespace spvtools {
namespace fuzz {
TransformationCompositeExtract::TransformationCompositeExtract(
protobufs::TransformationCompositeExtract message)
: message_(std::move(message)) {}
TransformationCompositeExtract::TransformationCompositeExtract(
const protobufs::InstructionDescriptor& instruction_to_insert_before,
uint32_t fresh_id, uint32_t composite_id,
const std::vector<uint32_t>& index) {
*message_.mutable_instruction_to_insert_before() =
instruction_to_insert_before;
message_.set_fresh_id(fresh_id);
message_.set_composite_id(composite_id);
for (auto an_index : index) {
message_.add_index(an_index);
}
}
bool TransformationCompositeExtract::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
return false;
}
auto instruction_to_insert_before =
FindInstruction(message_.instruction_to_insert_before(), ir_context);
if (!instruction_to_insert_before) {
return false;
}
auto composite_instruction =
ir_context->get_def_use_mgr()->GetDef(message_.composite_id());
if (!composite_instruction) {
return false;
}
if (!fuzzerutil::IdIsAvailableBeforeInstruction(
ir_context, instruction_to_insert_before, message_.composite_id())) {
return false;
}
auto composite_type =
ir_context->get_type_mgr()->GetType(composite_instruction->type_id());
if (!fuzzerutil::IsCompositeType(composite_type)) {
return false;
}
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(
spv::Op::OpCompositeExtract, instruction_to_insert_before)) {
return false;
}
return fuzzerutil::WalkCompositeTypeIndices(ir_context,
composite_instruction->type_id(),
message_.index()) != 0;
}
void TransformationCompositeExtract::Apply(
opt::IRContext* ir_context,
TransformationContext* transformation_context) const {
opt::Instruction::OperandList extract_operands;
extract_operands.push_back({SPV_OPERAND_TYPE_ID, {message_.composite_id()}});
for (auto an_index : message_.index()) {
extract_operands.push_back({SPV_OPERAND_TYPE_LITERAL_INTEGER, {an_index}});
}
auto composite_instruction =
ir_context->get_def_use_mgr()->GetDef(message_.composite_id());
auto extracted_type = fuzzerutil::WalkCompositeTypeIndices(
ir_context, composite_instruction->type_id(), message_.index());
auto insert_before =
FindInstruction(message_.instruction_to_insert_before(), ir_context);
opt::Instruction* new_instruction =
insert_before->InsertBefore(MakeUnique<opt::Instruction>(
ir_context, spv::Op::OpCompositeExtract, extracted_type,
message_.fresh_id(), extract_operands));
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_instruction);
ir_context->set_instr_block(new_instruction,
ir_context->get_instr_block(insert_before));
fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
// No analyses need to be invalidated since the transformation is local to a
// block and the def-use and instruction-to-block mappings have been updated.
AddDataSynonymFacts(ir_context, transformation_context);
}
protobufs::Transformation TransformationCompositeExtract::ToMessage() const {
protobufs::Transformation result;
*result.mutable_composite_extract() = message_;
return result;
}
std::unordered_set<uint32_t> TransformationCompositeExtract::GetFreshIds()
const {
return {message_.fresh_id()};
}
void TransformationCompositeExtract::AddDataSynonymFacts(
opt::IRContext* ir_context,
TransformationContext* transformation_context) const {
// Don't add synonyms if the composite being extracted from is not suitable,
// or if the result id into which we are extracting is irrelevant.
if (!fuzzerutil::CanMakeSynonymOf(
ir_context, *transformation_context,
*ir_context->get_def_use_mgr()->GetDef(message_.composite_id())) ||
transformation_context->GetFactManager()->IdIsIrrelevant(
message_.fresh_id())) {
return;
}
// Add the fact that the id storing the extracted element is synonymous with
// the index into the structure.
std::vector<uint32_t> indices(message_.index().begin(),
message_.index().end());
auto data_descriptor_for_extracted_element =
MakeDataDescriptor(message_.composite_id(), indices);
auto data_descriptor_for_result_id =
MakeDataDescriptor(message_.fresh_id(), {});
transformation_context->GetFactManager()->AddFactDataSynonym(
data_descriptor_for_extracted_element, data_descriptor_for_result_id);
}
} // namespace fuzz
} // namespace spvtools
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