1//===- FindDiagnosticID.cpp - diagtool tool for finding diagnostic id -----===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "DiagTool.h"
10#include "DiagnosticNames.h"
11#include "clang/Basic/AllDiagnostics.h"
12#include "llvm/Support/CommandLine.h"
13#include <optional>
14
15DEF_DIAGTOOL("find-diagnostic-id", "Print the id of the given diagnostic",
16             FindDiagnosticID)
17
18using namespace clang;
19using namespace diagtool;
20
21static StringRef getNameFromID(StringRef Name) {
22  int DiagID;
23  if(!Name.getAsInteger(0, DiagID)) {
24    const DiagnosticRecord &Diag = getDiagnosticForID(DiagID);
25    return Diag.getName();
26  }
27  return StringRef();
28}
29
30static std::optional<DiagnosticRecord>
31findDiagnostic(ArrayRef<DiagnosticRecord> Diagnostics, StringRef Name) {
32  for (const auto &Diag : Diagnostics) {
33    StringRef DiagName = Diag.getName();
34    if (DiagName == Name)
35      return Diag;
36  }
37  return std::nullopt;
38}
39
40int FindDiagnosticID::run(unsigned int argc, char **argv,
41                          llvm::raw_ostream &OS) {
42  static llvm::cl::OptionCategory FindDiagnosticIDOptions(
43      "diagtool find-diagnostic-id options");
44
45  static llvm::cl::opt<std::string> DiagnosticName(
46      llvm::cl::Positional, llvm::cl::desc("<diagnostic-name>"),
47      llvm::cl::Required, llvm::cl::cat(FindDiagnosticIDOptions));
48
49  std::vector<const char *> Args;
50  Args.push_back("diagtool find-diagnostic-id");
51  for (const char *A : llvm::ArrayRef(argv, argc))
52    Args.push_back(A);
53
54  llvm::cl::HideUnrelatedOptions(FindDiagnosticIDOptions);
55  llvm::cl::ParseCommandLineOptions((int)Args.size(), Args.data(),
56                                    "Diagnostic ID mapping utility");
57
58  ArrayRef<DiagnosticRecord> AllDiagnostics = getBuiltinDiagnosticsByName();
59  std::optional<DiagnosticRecord> Diag =
60      findDiagnostic(AllDiagnostics, DiagnosticName);
61  if (!Diag) {
62    // Name to id failed, so try id to name.
63    auto Name = getNameFromID(DiagnosticName);
64    if (!Name.empty()) {
65      OS << Name << '\n';
66      return 0;
67    }
68
69    llvm::errs() << "error: invalid diagnostic '" << DiagnosticName << "'\n";
70    return 1;
71  }
72  OS << Diag->DiagID << "\n";
73  return 0;
74}
75