SPIRV-Tools/source/fuzz/transformation_composite_extract.cpp
2020-07-22 19:03:58 +01:00

141 lines
5.2 KiB
C++

// 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(
const spvtools::fuzz::protobufs::TransformationCompositeExtract& message)
: message_(message) {}
TransformationCompositeExtract::TransformationCompositeExtract(
const protobufs::InstructionDescriptor& instruction_to_insert_before,
uint32_t fresh_id, uint32_t composite_id, 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& transformation_context) 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 (!transformation_context.GetFactManager()->IdIsIrrelevant(
message_.composite_id()) &&
!fuzzerutil::CanMakeSynonymOf(ir_context, transformation_context,
composite_instruction)) {
// |composite_id| will participate in DataSynonym facts. Thus, it can't be
// an irrelevant id.
return false;
}
if (auto block = ir_context->get_instr_block(composite_instruction)) {
if (composite_instruction == instruction_to_insert_before ||
!ir_context->GetDominatorAnalysis(block->GetParent())
->Dominates(composite_instruction, instruction_to_insert_before)) {
return false;
}
}
assert(composite_instruction->type_id() &&
"An instruction in a block cannot have a result id but no type id.");
auto composite_type =
ir_context->get_type_mgr()->GetType(composite_instruction->type_id());
if (!composite_type) {
return false;
}
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(
SpvOpCompositeExtract, 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());
FindInstruction(message_.instruction_to_insert_before(), ir_context)
->InsertBefore(MakeUnique<opt::Instruction>(
ir_context, SpvOpCompositeExtract, extracted_type,
message_.fresh_id(), extract_operands));
fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
ir_context->InvalidateAnalysesExceptFor(
opt::IRContext::Analysis::kAnalysisNone);
// Add the fact that the id storing the extracted element is synonymous with
// the index into the structure.
if (!transformation_context->GetFactManager()->IdIsIrrelevant(
message_.composite_id())) {
std::vector<uint32_t> indices;
for (auto an_index : message_.index()) {
indices.push_back(an_index);
}
protobufs::DataDescriptor data_descriptor_for_extracted_element =
MakeDataDescriptor(message_.composite_id(), std::move(indices));
protobufs::DataDescriptor data_descriptor_for_result_id =
MakeDataDescriptor(message_.fresh_id(), {});
transformation_context->GetFactManager()->AddFactDataSynonym(
data_descriptor_for_extracted_element, data_descriptor_for_result_id,
ir_context);
}
}
protobufs::Transformation TransformationCompositeExtract::ToMessage() const {
protobufs::Transformation result;
*result.mutable_composite_extract() = message_;
return result;
}
} // namespace fuzz
} // namespace spvtools