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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_add_constant_composite.h"
#include <vector>
#include "source/fuzz/fuzzer_util.h"
namespace spvtools {
namespace fuzz {
TransformationAddConstantComposite::TransformationAddConstantComposite(
spvtools::fuzz::protobufs::TransformationAddConstantComposite message)
: message_(std::move(message)) {}
TransformationAddConstantComposite::TransformationAddConstantComposite(
uint32_t fresh_id, uint32_t type_id,
const std::vector<uint32_t>& constituent_ids, bool is_irrelevant) {
message_.set_fresh_id(fresh_id);
message_.set_type_id(type_id);
message_.set_is_irrelevant(is_irrelevant);
for (auto constituent_id : constituent_ids) {
message_.add_constituent_id(constituent_id);
}
}
bool TransformationAddConstantComposite::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
// Check that the given id is fresh.
if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
return false;
}
// Check that the composite type id is an instruction id.
auto composite_type_instruction =
ir_context->get_def_use_mgr()->GetDef(message_.type_id());
if (!composite_type_instruction) {
return false;
}
// Gather up the operands for the composite constant, in the process checking
// whether the given type really defines a composite and - in the case of a
// struct - whether its decorations are OK.
std::vector<uint32_t> constituent_type_ids;
switch (composite_type_instruction->opcode()) {
case spv::Op::OpTypeArray:
for (uint32_t index = 0;
index <
fuzzerutil::GetArraySize(*composite_type_instruction, ir_context);
index++) {
constituent_type_ids.push_back(
composite_type_instruction->GetSingleWordInOperand(0));
}
break;
case spv::Op::OpTypeMatrix:
case spv::Op::OpTypeVector:
for (uint32_t index = 0;
index < composite_type_instruction->GetSingleWordInOperand(1);
index++) {
constituent_type_ids.push_back(
composite_type_instruction->GetSingleWordInOperand(0));
}
break;
case spv::Op::OpTypeStruct:
// We do not create constants of structs decorated with Block nor
// BufferBlock. The SPIR-V spec does not explicitly disallow this, but it
// seems like a strange thing to do, so we disallow it to avoid triggering
// low priority edge case issues related to it.
if (fuzzerutil::HasBlockOrBufferBlockDecoration(
ir_context, composite_type_instruction->result_id())) {
return false;
}
composite_type_instruction->ForEachInOperand(
[&constituent_type_ids](const uint32_t* member_type_id) {
constituent_type_ids.push_back(*member_type_id);
});
break;
default:
// Not a composite type.
return false;
}
// Check that the number of provided operands matches the number of
// constituents required by the type.
if (constituent_type_ids.size() !=
static_cast<uint32_t>(message_.constituent_id().size())) {
return false;
}
// Check that every provided operand refers to an instruction of the
// corresponding constituent type.
for (uint32_t index = 0; index < constituent_type_ids.size(); index++) {
auto constituent_instruction =
ir_context->get_def_use_mgr()->GetDef(message_.constituent_id(index));
if (!constituent_instruction) {
return false;
}
if (constituent_instruction->type_id() != constituent_type_ids.at(index)) {
return false;
}
}
return true;
}
void TransformationAddConstantComposite::Apply(
opt::IRContext* ir_context,
TransformationContext* transformation_context) const {
opt::Instruction::OperandList in_operands;
for (auto constituent_id : message_.constituent_id()) {
in_operands.push_back({SPV_OPERAND_TYPE_ID, {constituent_id}});
}
auto new_instruction = MakeUnique<opt::Instruction>(
ir_context, spv::Op::OpConstantComposite, message_.type_id(),
message_.fresh_id(), in_operands);
auto new_instruction_ptr = new_instruction.get();
ir_context->module()->AddGlobalValue(std::move(new_instruction));
fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
// Inform the def-use manager of the new instruction. Invalidate the constant
// manager as we have added a new constant.
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_instruction_ptr);
ir_context->InvalidateAnalyses(opt::IRContext::kAnalysisConstants);
if (message_.is_irrelevant()) {
transformation_context->GetFactManager()->AddFactIdIsIrrelevant(
message_.fresh_id());
}
}
protobufs::Transformation TransformationAddConstantComposite::ToMessage()
const {
protobufs::Transformation result;
*result.mutable_add_constant_composite() = message_;
return result;
}
std::unordered_set<uint32_t> TransformationAddConstantComposite::GetFreshIds()
const {
return {message_.fresh_id()};
}
} // namespace fuzz
} // namespace spvtools
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