1 //===--- CommonOptionsParser.cpp - common options for clang tools ---------===//
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
7 //===----------------------------------------------------------------------===//
9 // This file implements the CommonOptionsParser class used to parse common
10 // command-line options for clang tools, so that they can be run as separate
11 // command-line applications with a consistent common interface for handling
12 // compilation database and input files.
14 // It provides a common subset of command-line options, common algorithm
15 // for locating a compilation database and source files, and help messages
16 // for the basic command-line interface.
18 // It creates a CompilationDatabase and reads common command-line options.
20 // This class uses the Clang Tooling infrastructure, see
21 // http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html
22 // for details on setting it up with LLVM source tree.
24 //===----------------------------------------------------------------------===//
26 #include "clang/Tooling/CommonOptionsParser.h"
27 #include "clang/Tooling/Tooling.h"
28 #include "llvm/Support/CommandLine.h"
30 using namespace clang::tooling;
33 const char *const CommonOptionsParser::HelpMessage =
35 "-p <build-path> is used to read a compile command database.\n"
37 "\tFor example, it can be a CMake build directory in which a file named\n"
38 "\tcompile_commands.json exists (use -DCMAKE_EXPORT_COMPILE_COMMANDS=ON\n"
39 "\tCMake option to get this output). When no build path is specified,\n"
40 "\ta search for compile_commands.json will be attempted through all\n"
41 "\tparent paths of the first input file . See:\n"
42 "\thttps://clang.llvm.org/docs/HowToSetupToolingForLLVM.html for an\n"
43 "\texample of setting up Clang Tooling on a source tree.\n"
45 "<source0> ... specify the paths of source files. These paths are\n"
46 "\tlooked up in the compile command database. If the path of a file is\n"
47 "\tabsolute, it needs to point into CMake's source tree. If the path is\n"
48 "\trelative, the current working directory needs to be in the CMake\n"
49 "\tsource tree and the file must be in a subdirectory of the current\n"
50 "\tworking directory. \"./\" prefixes in the relative files will be\n"
51 "\tautomatically removed, but the rest of a relative path must be a\n"
52 "\tsuffix of a path in the compile command database.\n"
55 void ArgumentsAdjustingCompilations::appendArgumentsAdjuster(
56 ArgumentsAdjuster Adjuster) {
57 Adjusters.push_back(std::move(Adjuster));
60 std::vector<CompileCommand> ArgumentsAdjustingCompilations::getCompileCommands(
61 StringRef FilePath) const {
62 return adjustCommands(Compilations->getCompileCommands(FilePath));
65 std::vector<std::string>
66 ArgumentsAdjustingCompilations::getAllFiles() const {
67 return Compilations->getAllFiles();
70 std::vector<CompileCommand>
71 ArgumentsAdjustingCompilations::getAllCompileCommands() const {
72 return adjustCommands(Compilations->getAllCompileCommands());
75 std::vector<CompileCommand> ArgumentsAdjustingCompilations::adjustCommands(
76 std::vector<CompileCommand> Commands) const {
77 for (CompileCommand &Command : Commands)
78 for (const auto &Adjuster : Adjusters)
79 Command.CommandLine = Adjuster(Command.CommandLine, Command.Filename);
83 llvm::Error CommonOptionsParser::init(
84 int &argc, const char **argv, cl::OptionCategory &Category,
85 llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
87 static cl::opt<std::string> BuildPath("p", cl::desc("Build path"),
88 cl::Optional, cl::cat(Category),
89 cl::sub(*cl::AllSubCommands));
91 static cl::list<std::string> SourcePaths(
92 cl::Positional, cl::desc("<source0> [... <sourceN>]"), OccurrencesFlag,
93 cl::cat(Category), cl::sub(*cl::AllSubCommands));
95 static cl::list<std::string> ArgsAfter(
97 cl::desc("Additional argument to append to the compiler command line"),
98 cl::cat(Category), cl::sub(*cl::AllSubCommands));
100 static cl::list<std::string> ArgsBefore(
102 cl::desc("Additional argument to prepend to the compiler command line"),
103 cl::cat(Category), cl::sub(*cl::AllSubCommands));
105 cl::ResetAllOptionOccurrences();
107 cl::HideUnrelatedOptions(Category);
109 std::string ErrorMessage;
111 FixedCompilationDatabase::loadFromCommandLine(argc, argv, ErrorMessage);
112 if (!ErrorMessage.empty())
113 ErrorMessage.append("\n");
114 llvm::raw_string_ostream OS(ErrorMessage);
115 // Stop initializing if command-line option parsing failed.
116 if (!cl::ParseCommandLineOptions(argc, argv, Overview, &OS)) {
118 return llvm::make_error<llvm::StringError>("[CommonOptionsParser]: " +
120 llvm::inconvertibleErrorCode());
123 cl::PrintOptionValues();
125 SourcePathList = SourcePaths;
126 if ((OccurrencesFlag == cl::ZeroOrMore || OccurrencesFlag == cl::Optional) &&
127 SourcePathList.empty())
128 return llvm::Error::success();
130 if (!BuildPath.empty()) {
132 CompilationDatabase::autoDetectFromDirectory(BuildPath, ErrorMessage);
134 Compilations = CompilationDatabase::autoDetectFromSource(SourcePaths[0],
138 llvm::errs() << "Error while trying to load a compilation database:\n"
139 << ErrorMessage << "Running without flags.\n";
141 new FixedCompilationDatabase(".", std::vector<std::string>()));
144 auto AdjustingCompilations =
145 llvm::make_unique<ArgumentsAdjustingCompilations>(
146 std::move(Compilations));
148 getInsertArgumentAdjuster(ArgsBefore, ArgumentInsertPosition::BEGIN);
149 Adjuster = combineAdjusters(
151 getInsertArgumentAdjuster(ArgsAfter, ArgumentInsertPosition::END));
152 AdjustingCompilations->appendArgumentsAdjuster(Adjuster);
153 Compilations = std::move(AdjustingCompilations);
154 return llvm::Error::success();
157 llvm::Expected<CommonOptionsParser> CommonOptionsParser::create(
158 int &argc, const char **argv, llvm::cl::OptionCategory &Category,
159 llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
160 CommonOptionsParser Parser;
162 Parser.init(argc, argv, Category, OccurrencesFlag, Overview);
164 return std::move(Err);
165 return std::move(Parser);
168 CommonOptionsParser::CommonOptionsParser(
169 int &argc, const char **argv, cl::OptionCategory &Category,
170 llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
171 llvm::Error Err = init(argc, argv, Category, OccurrencesFlag, Overview);
173 llvm::report_fatal_error(
174 "CommonOptionsParser: failed to parse command-line arguments. " +
175 llvm::toString(std::move(Err)));