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// Copyright (c) 2021 Mostafa Ashraf
//
// 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_swap_function_variables.h"
#include "source/fuzz/fuzzer_util.h"
namespace spvtools {
namespace fuzz {
TransformationSwapFunctionVariables::TransformationSwapFunctionVariables(
protobufs::TransformationSwapFunctionVariables message)
: message_(std::move(message)) {}
TransformationSwapFunctionVariables::TransformationSwapFunctionVariables(
uint32_t result_id1, uint32_t result_id2) {
message_.set_result_id1(result_id1);
message_.set_result_id2(result_id2);
}
bool TransformationSwapFunctionVariables::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
uint32_t result_id1 = message_.result_id1();
uint32_t result_id2 = message_.result_id2();
assert((result_id1 != result_id2) && "Two results ids are equal");
// The result ids used in the message must refer to instructions.
auto instruction1 = ir_context->get_def_use_mgr()->GetDef(result_id1);
auto instruction2 = ir_context->get_def_use_mgr()->GetDef(result_id2);
if (instruction1 == nullptr || instruction2 == nullptr) {
return false;
}
// Both instructions must be variables.
if (instruction1->opcode() != spv::Op::OpVariable ||
instruction2->opcode() != spv::Op::OpVariable) {
return false;
}
// Both variable instructions must be in some basic block (as they are
// function-local variables), and they must be in the same block (as they need
// to be variables of the same function).
auto* block_1 = ir_context->get_instr_block(result_id1);
auto* block_2 = ir_context->get_instr_block(result_id2);
if (block_1 == nullptr || block_2 == nullptr) {
return false;
}
return block_1 == block_2;
}
void TransformationSwapFunctionVariables::Apply(
opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
// The result ids used in the message must refer to instructions.
auto instruction1 =
ir_context->get_def_use_mgr()->GetDef(message_.result_id1());
auto instruction2 =
ir_context->get_def_use_mgr()->GetDef(message_.result_id2());
std::unique_ptr<opt::Instruction> temp_instruction =
MakeUnique<opt::Instruction>();
temp_instruction->InsertBefore(instruction1);
instruction1->InsertAfter(instruction2);
instruction2->InsertAfter(temp_instruction.get());
temp_instruction->RemoveFromList();
}
protobufs::Transformation TransformationSwapFunctionVariables::ToMessage()
const {
protobufs::Transformation result;
*result.mutable_swap_function_variables() = message_;
return result;
}
std::unordered_set<uint32_t> TransformationSwapFunctionVariables::GetFreshIds()
const {
return std::unordered_set<uint32_t>();
}
} // namespace fuzz
} // namespace spvtools
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