// Copyright 2023 The IREE Authors
//
// Licensed under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#include "iree/compiler/Codegen/Transforms/Transforms.h"
#include "iree/compiler/Codegen/Utils/Utils.h"
#include "llvm/ADT/TypeSwitch.h"
#include "mlir/Dialect/Arith/IR/Arith.h"
#include "mlir/Dialect/MemRef/IR/MemRef.h"
#include "mlir/Dialect/Vector/IR/VectorOps.h"
#include "mlir/Pass/Pass.h"

namespace mlir::iree_compiler {

#define GEN_PASS_DEF_INSTRUMENTMEMORYACCESSESPASS
#include "iree/compiler/Codegen/Common/Passes.h.inc"

namespace {

struct InstrumentMemoryAccessesPass
    : impl::InstrumentMemoryAccessesPassBase<InstrumentMemoryAccessesPass> {
  void runOnOperation() override {
    // Lookup the root instrumentation op. If not present it means the dispatch
    // is not instrumented and we can skip it.
    IREE::HAL::InstrumentWorkgroupOp instrumentOp;
    getOperation().walk([&](IREE::HAL::InstrumentWorkgroupOp op) {
      instrumentOp = op;
      return WalkResult::interrupt();
    });
    if (!instrumentOp) {
      // Not instrumented.
      return;
    }

    auto buffer = instrumentOp.getBuffer();
    auto workgroupKey = instrumentOp.getWorkgroupKey();
    getOperation()->walk([&](Operation *op) {
      TypeSwitch<Operation *>(op)
          .Case([&](memref::LoadOp loadOp) {
            OpBuilder builder(loadOp);
            builder.setInsertionPointAfter(loadOp);
            auto instrumentOp = IREE::HAL::InstrumentMemoryLoadOp::create(
                builder, loadOp.getLoc(), loadOp.getResult().getType(), buffer,
                workgroupKey, loadOp.getResult(), loadOp.getMemRef(),
                loadOp.getIndices());
            loadOp.getResult().replaceAllUsesExcept(instrumentOp.getResult(),
                                                    instrumentOp);
          })
          .Case([&](memref::StoreOp storeOp) {
            OpBuilder builder(storeOp);
            auto instrumentOp = IREE::HAL::InstrumentMemoryStoreOp::create(
                builder, storeOp.getLoc(), storeOp.getValueToStore().getType(),
                buffer, workgroupKey, storeOp.getValueToStore(),
                storeOp.getMemRef(), storeOp.getIndices());
            storeOp.getValueMutable().assign(instrumentOp.getResult());
          })
          .Case([&](vector::LoadOp loadOp) {
            OpBuilder builder(loadOp);
            builder.setInsertionPointAfter(loadOp);
            auto instrumentOp = IREE::HAL::InstrumentMemoryLoadOp::create(
                builder, loadOp.getLoc(), loadOp.getVectorType(), buffer,
                workgroupKey, loadOp.getResult(), loadOp.getBase(),
                loadOp.getIndices());
            loadOp.getResult().replaceAllUsesExcept(instrumentOp.getResult(),
                                                    instrumentOp);
          })
          .Case([&](vector::StoreOp storeOp) {
            OpBuilder builder(storeOp);
            auto instrumentOp = IREE::HAL::InstrumentMemoryStoreOp::create(
                builder, storeOp.getLoc(), storeOp.getVectorType(), buffer,
                workgroupKey, storeOp.getValueToStore(), storeOp.getBase(),
                storeOp.getIndices());
            storeOp.getValueToStoreMutable().assign(instrumentOp.getResult());
          })
          .Default([&](Operation *) {});
    });
  }
};

} // namespace
} // namespace mlir::iree_compiler
