[llvm] [openmp] [Offload] Implement double free (and other allocation error) reporting (PR #100261)

[Johannes Doerfert via llvm-commits]

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+//===- 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 OFFLOAD_PLUGINS_NEXTGEN_COMMON_ERROR_REPORTING_H
+#define OFFLOAD_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 "llvm/Support/WithColor.h"
+#include "llvm/Support/raw_ostream.h"
+
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <functional>
+#include <optional>
+#include <string>
+#include <unistd.h>
+
+namespace llvm {
+namespace omp {
+namespace target {
+namespace plugin {
+
+class ErrorReporter {
+
+  enum ColorTy {
+    Yellow = int(HighlightColor::Address),
+    Green = int(HighlightColor::String),
+    DarkBlue = int(HighlightColor::Tag),
+    Cyan = int(HighlightColor::Attribute),
+    DarkPurple = int(HighlightColor::Enumerator),
+    DarkRed = int(HighlightColor::Macro),
+    BoldRed = int(HighlightColor::Error),
+    BoldLightPurple = int(HighlightColor::Warning),
+    BoldDarkGrey = int(HighlightColor::Note),
+    BoldLightBlue = int(HighlightColor::Remark),
+  };
+
+  /// The banner printed at the beginning of an error report.
+  static constexpr auto ErrorBanner = "OFFLOAD ERROR: ";
+
+  /// 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 StringRef 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");
+  }
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wgcc-compat"
+#pragma clang diagnostic ignored "-Wformat-security"
+  /// Print \p Format, instantiated with \p Args to stderr.
+  /// TODO: Allow redirection into a file stream.
+  template <typename... ArgsTy>
+  [[gnu::format(__printf__, 1, 2)]] static void print(const char *Format,
+                                                      ArgsTy &&...Args) {
+    raw_fd_ostream OS(STDERR_FILENO, false);
+    OS << llvm::format(Format, Args...);
+  }
+
+  /// Print \p Format, instantiated with \p Args to stderr, but colored.
+  /// TODO: Allow redirection into a file stream.
+  template <typename... ArgsTy>
+  [[gnu::format(__printf__, 2, 3)]] static void
+  print(ColorTy Color, const char *Format, ArgsTy &&...Args) {
+    raw_fd_ostream OS(STDERR_FILENO, false);
+    WithColor(OS, HighlightColor(Color)) << llvm::format(Format, Args...);
+  }
+
+  /// Print \p Format, instantiated with \p Args to stderr, but colored and with
+  /// a banner.
+  /// TODO: Allow redirection into a file stream.
+  template <typename... ArgsTy>
+  [[gnu::format(__printf__, 1, 2)]] static void reportError(const char *Format,
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jdoerfert wrote:

It provides you with format warnings, e.g. ("%d", (size_t)1) -> warning + fixit to %zu

https://github.com/llvm/llvm-project/pull/100261