/* Copyright 2023 The TensorFlow Authors. All Rights Reserved.

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 "tensorflow/compiler/mlir/tf2xla/api/v1/tf_dialect_to_executor.h"

#include <memory>
#include <string>
#include <utility>

#include "absl/log/log.h"
#include "absl/status/status.h"
#include "llvm/ADT/StringRef.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"  // from @llvm-project
#include "mlir/IR/BuiltinOps.h"  // from @llvm-project
#include "mlir/Pass/PassManager.h"  // from @llvm-project
#include "mlir/Pass/PassRegistry.h"  // from @llvm-project
#include "mlir/Support/LogicalResult.h"  // from @llvm-project
#include "mlir/Transforms/Passes.h"  // from @llvm-project
#include "tensorflow/compiler/jit/flags.h"
#include "tensorflow/compiler/mlir/tensorflow/transforms/passes.h"
#include "tensorflow/compiler/mlir/tensorflow/utils/data_dumper_logger_config.h"
#include "tensorflow/compiler/mlir/tensorflow/utils/dump_mlir_util.h"
#include "tensorflow/compiler/mlir/tensorflow/utils/error_util.h"
#include "tensorflow/compiler/mlir/tf2xla/internal/logging_hooks.h"
#include "tensorflow/core/platform/error_payloads.h"
#include "tensorflow/core/platform/status.h"
#include "tensorflow/core/util/debug_data_dumper.h"
#include "tsl/lib/monitoring/counter.h"
#include "tsl/platform/error_logging.h"
#include "tsl/platform/status.h"

namespace tensorflow {
namespace tf2xla {
namespace v1 {

using mlir::LogicalResult;
using mlir::ModuleOp;
using mlir::OpPassManager;
using mlir::Pass;
using mlir::PassManager;
using mlir::func::FuncOp;

auto *tf_dialect_to_executor_dialect_status = tsl::monitoring::Counter<1>::New(
    "/tensorflow/core/tf2xla/api/v1/tf_dialect_to_executor_dialect_status",
    "Counts how often a successful export from TF Dialect to Executor Dialect "
    "is",
    "status");

constexpr char kExportSuccess[] = "success";
constexpr char kExportFailed[] = "failed";

namespace {

void AddTfDialectToExecutorPasses(OpPassManager &pm) {
  auto add_pass = [&](std::unique_ptr<Pass> pass) {
    pm.addNestedPass<FuncOp>(std::move(pass));
    pm.addPass(mlir::CreateBreakUpIslandsPass());
  };

  pm.addPass(mlir::tf_executor::CreateTFExecutorTPUV1IslandInliningPass());
  // There are cases where we don't consume all compilation and
  // replication attributes like we do for the V2 pipeline, so we need to
  // convert them from unified to legacy attributes before they get
  // exposed to outside of the bridge.
  pm.addNestedPass<FuncOp>(
      mlir::TFTPU::CreateConvertToLegacyCompileAndReplicateAttributesPass());

  pm.addPass(mlir::TF::CreateTFRegionControlFlowToFunctional());
  add_pass(mlir::CreateFunctionalToExecutorDialectConversionPass());
  add_pass(mlir::TFDevice::CreateReplicateToIslandPass(
      /*legacy_graph_export=*/true));
  add_pass(mlir::TFDevice::CreateReplicaIDToDeviceOrdinalPass());
  add_pass(mlir::TFDevice::CreateParallelExecuteToIslandsPass(
      /*legacy_graph_export=*/true));
  add_pass(mlir::TFDevice::CreateLaunchToDeviceAttributePass(
      /*legacy_graph_export=*/true));
  pm.addNestedPass<FuncOp>(mlir::TFTPU::CreateTPUDevicePropagationPass());
  pm.addNestedPass<FuncOp>(mlir::TFTPU::CreateTPUColocateSplitsPass());
  pm.addPass(mlir::createSymbolDCEPass());
  if (tensorflow::GetMlirCommonFlags()
          ->tf_mlir_enable_convert_control_to_data_outputs_pass) {
    pm.addPass(
        mlir::tf_executor::CreateTFExecutorConvertControlToDataOutputsPass());
  }
  pm.addPass(mlir::TF::CreateVerifySuitableForExportPass());
}

tensorflow::Status RecordStatusIfError(absl::Status status) {
  if (status.ok()) {
    return absl::OkStatus();
  }

  VLOG(1) << "Failed to export from TF Dialect to TF Executor Dialect. "
          << status;
  tf_dialect_to_executor_dialect_status->GetCell(kExportFailed)->IncrementBy(1);

  constexpr char bridge_subcomponent[] =
      "TFXLA_TF_FUNCTIONAL_TO_EXECUTOR_EXPORT_v1";
  constexpr char kBridgeComponent[] = "TFXLABridge";

  tsl::OkOrSetErrorCounterPayload(
      tensorflow::core::platform::ErrorSourceProto::MLIR_BRIDGE_PHASE_1,
      status);

  tsl::error_logging::Log(kBridgeComponent, bridge_subcomponent,
                          status.ToString())
      .IgnoreError();

  return status;
}

}  // namespace

tensorflow::Status ExportFromTensorflowDialectToExecutor(
    ModuleOp module, llvm::StringRef module_name) {
  PassManager tf_to_executor(module.getContext());
  ::tensorflow::applyTensorflowAndCLOptions(tf_to_executor);
  tf_to_executor.enableVerifier();

  AddTfDialectToExecutorPasses(tf_to_executor);

  mlir::StatusScopedDiagnosticHandler diag_handler(
      module.getContext(), /*propagate=*/false,
      /*filter_stack=*/!VLOG_IS_ON(1));

  if (VLOG_IS_ON(1) ||
      DEBUG_DATA_DUMPER()->ShouldDump(module_name.str(), kDebugGroupMain)) {
    ::tensorflow::DumpMlirOpToFile(
        DEBUG_DATA_DUMPER()->GetDumpFilename(
            module_name.str(), kDebugGroupMain,
            "tfxla_bridge_v1_tfdialect_to_executor_before"),
        module, llvm::StringRef(), &tf_to_executor);

    if (VLOG_IS_ON(2) ||
        DEBUG_DATA_DUMPER()->ShouldDump(
            module_name.str(), kDebugGroupBridgePhase1ExecutorExport)) {
      internal::EnablePassIRPrinting(
          tf_to_executor, kDebugGroupBridgePhase1ExecutorExport, module_name);
    }
  }

  LogicalResult result = tf_to_executor.run(module);
  (void)result;  // Ignore the error since it's captured by the diag_handler.

  if (VLOG_IS_ON(1) ||
      DEBUG_DATA_DUMPER()->ShouldDump(module_name.str(), kDebugGroupMain)) {
    ::tensorflow::DumpMlirOpToFile(
        DEBUG_DATA_DUMPER()->GetDumpFilename(
            module_name.str(), kDebugGroupMain,
            "tfxla_bridge_v1_tfdialect_to_executor_after"),
        module, llvm::StringRef(), &tf_to_executor);
  }

  if (result.failed()) {
    return RecordStatusIfError(diag_handler.ConsumeStatus());
  }

  tf_dialect_to_executor_dialect_status->GetCell(kExportSuccess)
      ->IncrementBy(1);

  return diag_handler.ConsumeStatus();
}

// Registers a pipeline builder function for TF Graph export. Should be
// the same as ExportFromTensorflowDialectToExecutor just in PassRegistration
// form.
mlir::PassPipelineRegistration<> tf_dialect_to_executor_pipeline(
    "tf-dialect-to-executor-v1",
    "Run passes to convert from TF Dialect to Executor in preparation for "
    "exporting module back to TF Graph.",
    AddTfDialectToExecutorPasses);

}  // namespace v1
}  // namespace tf2xla
}  // namespace tensorflow
