[llvm] [openmp] [Offload] Allow to record kernel launch stack traces (PR #100472)

[Joseph Huber via llvm-commits]

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@@ -0,0 +1,293 @@
+//===- ErrorReporting.h - Helper to provide nice error messages ----- c++ -===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef OPENMP_LIBOMPTARGET_PLUGINS_NEXTGEN_COMMON_ERROR_REPORTING_H
+#define OPENMP_LIBOMPTARGET_PLUGINS_NEXTGEN_COMMON_ERROR_REPORTING_H
+
+#include "PluginInterface.h"
+#include "Shared/EnvironmentVar.h"
+
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/ErrorHandling.h"
+
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <functional>
+#include <optional>
+#include <string>
+
+namespace llvm {
+namespace omp {
+namespace target {
+namespace plugin {
+
+class ErrorReporter {
+  /// The banner printed at the beginning of an error report.
+  static constexpr auto ErrorBanner = "OFFLOAD ERROR: ";
+
+  /// Terminal color codes
+  ///
+  /// TODO: determine if the terminal supports colors.
+  ///@{
+  static constexpr auto Green = []() { return "\033[1m\033[32m"; };
+  static constexpr auto Blue = []() { return "\033[1m\033[34m"; };
+  static constexpr auto Red = []() { return "\033[1m\033[31m"; };
+  static constexpr auto Magenta = []() { return "\033[1m\033[35m"; };
+  static constexpr auto Cyan = []() { return "\033[1m\033[36m"; };
+  static constexpr auto Default = []() { return "\033[1m\033[0m"; };
+  ///@}
+
+  /// The size of the getBuffer() buffer.
+  static constexpr unsigned BufferSize = 1024;
+
+  /// Return a buffer of size BufferSize that can be used for formatting.
+  static char *getBuffer() {
+    static char *Buffer = nullptr;
+    if (!Buffer)
+      Buffer = reinterpret_cast<char *>(malloc(BufferSize));
+    return Buffer;
+  }
+
+  /// Return the device id as string, or n/a if not available.
+  static std::string getDeviceIdStr(GenericDeviceTy *Device) {
+    return Device ? std::to_string(Device->getDeviceId()) : "n/a";
+  }
+
+  /// Return a nice name for an TargetAllocTy.
+  static std::string getAllocTyName(TargetAllocTy Kind) {
+    switch (Kind) {
+    case TARGET_ALLOC_DEVICE_NON_BLOCKING:
+    case TARGET_ALLOC_DEFAULT:
+    case TARGET_ALLOC_DEVICE:
+      return "device memory";
+    case TARGET_ALLOC_HOST:
+      return "pinned host memory";
+    case TARGET_ALLOC_SHARED:
+      return "managed memory";
+      break;
+    }
+    llvm_unreachable("Unknown target alloc kind");
+  }
+
+  /// Return a C string after \p Format has been instantiated with \p Args.
+  template <typename... ArgsTy>
+  static const char *getCString(const char *Format, ArgsTy &&...Args) {
+    std::snprintf(getBuffer(), BufferSize, Format,
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jhuber6 wrote:

Doesn't LLVM have `Format.h` that also wraps around `snprintf`?

https://github.com/llvm/llvm-project/pull/100472