[llvm] [libsycl] Add liboffload kernel creation (PR #188794)

[Kseniya Tikhomirova via llvm-commits]

================
@@ -0,0 +1,81 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file contains the declaration of the class that aggregates information
+/// specific to device kernels (i.e. information that is uniform between
+/// different submissions of the same kernel).
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBSYCL_DEVICE_KERNEL_INFO
+#define _LIBSYCL_DEVICE_KERNEL_INFO
+
+#include <sycl/__impl/detail/config.hpp>
+
+#include <OffloadAPI.h>
+
+_LIBSYCL_BEGIN_NAMESPACE_SYCL
+namespace detail {
+
+class ProgramAndKernelManager;
+
+// TODO: Pointers to instances of this class are supported to be stored in
+// header function templates as a static variable to avoid repeated runtime
+// lookup overhead.
+class DeviceKernelInfo {
+public:
+  /// Constructs a device kernel info instance.
+  ///
+  /// \param KernelName the name of the kernel.
+  /// \param DeviceImage the device image containing device code of this kernel.
+  DeviceKernelInfo(std::string_view KernelName, DeviceImageManager &DeviceImage)
+      : MName(KernelName), MDeviceImage(DeviceImage) {}
+
+  /// \return the name of this kernel.
+  std::string_view getName() { return MName; }
+
+private:
+  std::unordered_map<ol_device_handle_t, ol_symbol_handle_t> MBuiltKernels;
+
+  std::string_view MName;
+  DeviceImageManager &MDeviceImage;
+
+  /// Searches for the existing kernel handle compatible with the specified
+  /// device.
+  /// \param Device the device the kernel must be compatible with.
+  /// \return a liboffload kernel handle if a built kernel was found; otherwise
+  /// returns nullptr.
+  ol_symbol_handle_t getKernel(ol_device_handle_t Device) const {
+    if (auto KernelIt = MBuiltKernels.find(Device);
+        KernelIt != MBuiltKernels.end())
+      return KernelIt->second;
+    return nullptr;
----------------
KseniyaTikhomirova wrote:

https://github.com/llvm/llvm-project/pull/188794/commits/dd46e5f2dfb639300f72fc0de1dba60a36c6779e

https://github.com/llvm/llvm-project/pull/188794