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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_replace_id_with_synonym.h"
#include <algorithm>
#include "source/fuzz/data_descriptor.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/id_use_descriptor.h"
#include "source/opt/types.h"
#include "source/util/make_unique.h"
namespace spvtools {
namespace fuzz {
TransformationReplaceIdWithSynonym::TransformationReplaceIdWithSynonym(
protobufs::TransformationReplaceIdWithSynonym message)
: message_(std::move(message)) {}
TransformationReplaceIdWithSynonym::TransformationReplaceIdWithSynonym(
protobufs::IdUseDescriptor id_use_descriptor, uint32_t synonymous_id) {
*message_.mutable_id_use_descriptor() = std::move(id_use_descriptor);
message_.set_synonymous_id(synonymous_id);
}
bool TransformationReplaceIdWithSynonym::IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const {
auto id_of_interest = message_.id_use_descriptor().id_of_interest();
// Does the fact manager know about the synonym?
auto data_descriptor_for_synonymous_id =
MakeDataDescriptor(message_.synonymous_id(), {});
if (!transformation_context.GetFactManager()->IsSynonymous(
MakeDataDescriptor(id_of_interest, {}),
data_descriptor_for_synonymous_id)) {
return false;
}
// Does the id use descriptor in the transformation identify an instruction?
auto use_instruction =
FindInstructionContainingUse(message_.id_use_descriptor(), ir_context);
if (!use_instruction) {
return false;
}
uint32_t type_id_of_interest =
ir_context->get_def_use_mgr()->GetDef(id_of_interest)->type_id();
uint32_t type_id_synonym = ir_context->get_def_use_mgr()
->GetDef(message_.synonymous_id())
->type_id();
// If the id of interest and the synonym are scalar or vector integer
// constants with different signedness, their use can only be swapped if the
// instruction is agnostic to the signedness of the operand.
if (!fuzzerutil::TypesAreCompatible(
ir_context, use_instruction->opcode(),
message_.id_use_descriptor().in_operand_index(), type_id_of_interest,
type_id_synonym)) {
return false;
}
// Is the use suitable for being replaced in principle?
if (!fuzzerutil::IdUseCanBeReplaced(
ir_context, transformation_context, use_instruction,
message_.id_use_descriptor().in_operand_index())) {
return false;
}
// The transformation is applicable if the synonymous id is available at the
// use point.
return fuzzerutil::IdIsAvailableAtUse(
ir_context, use_instruction,
message_.id_use_descriptor().in_operand_index(),
message_.synonymous_id());
}
void TransformationReplaceIdWithSynonym::Apply(
spvtools::opt::IRContext* ir_context,
TransformationContext* /*unused*/) const {
auto instruction_to_change =
FindInstructionContainingUse(message_.id_use_descriptor(), ir_context);
instruction_to_change->SetInOperand(
message_.id_use_descriptor().in_operand_index(),
{message_.synonymous_id()});
ir_context->get_def_use_mgr()->EraseUseRecordsOfOperandIds(
instruction_to_change);
ir_context->get_def_use_mgr()->AnalyzeInstUse(instruction_to_change);
// No analyses need to be invalidated, since the transformation is local to a
// block, and the def-use analysis has been updated.
}
protobufs::Transformation TransformationReplaceIdWithSynonym::ToMessage()
const {
protobufs::Transformation result;
*result.mutable_replace_id_with_synonym() = message_;
return result;
}
std::unordered_set<uint32_t> TransformationReplaceIdWithSynonym::GetFreshIds()
const {
return std::unordered_set<uint32_t>();
}
} // namespace fuzz
} // namespace spvtools
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