1 //===--- CommonOptionsParser.cpp - common options for clang tools ---------===//
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 // 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.
13 //
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.
17 //
18 // It creates a CompilationDatabase and reads common command-line options.
19 //
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.
23 //
24 //===----------------------------------------------------------------------===//
25
26 #include "clang/Tooling/CommonOptionsParser.h"
27 #include "clang/Tooling/Tooling.h"
28 #include "llvm/Support/CommandLine.h"
29
30 using namespace clang::tooling;
31 using namespace llvm;
32
33 const char *const CommonOptionsParser::HelpMessage =
34 "\n"
35 "-p <build-path> is used to read a compile command database.\n"
36 "\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"
44 "\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"
53 "\n";
54
appendArgumentsAdjuster(ArgumentsAdjuster Adjuster)55 void ArgumentsAdjustingCompilations::appendArgumentsAdjuster(
56 ArgumentsAdjuster Adjuster) {
57 Adjusters.push_back(std::move(Adjuster));
58 }
59
getCompileCommands(StringRef FilePath) const60 std::vector<CompileCommand> ArgumentsAdjustingCompilations::getCompileCommands(
61 StringRef FilePath) const {
62 return adjustCommands(Compilations->getCompileCommands(FilePath));
63 }
64
65 std::vector<std::string>
getAllFiles() const66 ArgumentsAdjustingCompilations::getAllFiles() const {
67 return Compilations->getAllFiles();
68 }
69
70 std::vector<CompileCommand>
getAllCompileCommands() const71 ArgumentsAdjustingCompilations::getAllCompileCommands() const {
72 return adjustCommands(Compilations->getAllCompileCommands());
73 }
74
adjustCommands(std::vector<CompileCommand> Commands) const75 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);
80 return Commands;
81 }
82
init(int & argc,const char ** argv,cl::OptionCategory & Category,llvm::cl::NumOccurrencesFlag OccurrencesFlag,const char * Overview)83 llvm::Error CommonOptionsParser::init(
84 int &argc, const char **argv, cl::OptionCategory &Category,
85 llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
86
87 static cl::opt<std::string> BuildPath("p", cl::desc("Build path"),
88 cl::Optional, cl::cat(Category),
89 cl::sub(cl::SubCommand::getAll()));
90
91 static cl::list<std::string> SourcePaths(
92 cl::Positional, cl::desc("<source0> [... <sourceN>]"), OccurrencesFlag,
93 cl::cat(Category), cl::sub(cl::SubCommand::getAll()));
94
95 static cl::list<std::string> ArgsAfter(
96 "extra-arg",
97 cl::desc("Additional argument to append to the compiler command line"),
98 cl::cat(Category), cl::sub(cl::SubCommand::getAll()));
99
100 static cl::list<std::string> ArgsBefore(
101 "extra-arg-before",
102 cl::desc("Additional argument to prepend to the compiler command line"),
103 cl::cat(Category), cl::sub(cl::SubCommand::getAll()));
104
105 cl::ResetAllOptionOccurrences();
106
107 cl::HideUnrelatedOptions(Category);
108
109 std::string ErrorMessage;
110 Compilations =
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)) {
117 OS.flush();
118 return llvm::make_error<llvm::StringError>(ErrorMessage,
119 llvm::inconvertibleErrorCode());
120 }
121
122 cl::PrintOptionValues();
123
124 SourcePathList = SourcePaths;
125 if ((OccurrencesFlag == cl::ZeroOrMore || OccurrencesFlag == cl::Optional) &&
126 SourcePathList.empty())
127 return llvm::Error::success();
128 if (!Compilations) {
129 if (!BuildPath.empty()) {
130 Compilations =
131 CompilationDatabase::autoDetectFromDirectory(BuildPath, ErrorMessage);
132 } else {
133 Compilations = CompilationDatabase::autoDetectFromSource(SourcePaths[0],
134 ErrorMessage);
135 }
136 if (!Compilations) {
137 llvm::errs() << "Error while trying to load a compilation database:\n"
138 << ErrorMessage << "Running without flags.\n";
139 Compilations.reset(
140 new FixedCompilationDatabase(".", std::vector<std::string>()));
141 }
142 }
143 auto AdjustingCompilations =
144 std::make_unique<ArgumentsAdjustingCompilations>(
145 std::move(Compilations));
146 Adjuster =
147 getInsertArgumentAdjuster(ArgsBefore, ArgumentInsertPosition::BEGIN);
148 Adjuster = combineAdjusters(
149 std::move(Adjuster),
150 getInsertArgumentAdjuster(ArgsAfter, ArgumentInsertPosition::END));
151 AdjustingCompilations->appendArgumentsAdjuster(Adjuster);
152 Compilations = std::move(AdjustingCompilations);
153 return llvm::Error::success();
154 }
155
create(int & argc,const char ** argv,llvm::cl::OptionCategory & Category,llvm::cl::NumOccurrencesFlag OccurrencesFlag,const char * Overview)156 llvm::Expected<CommonOptionsParser> CommonOptionsParser::create(
157 int &argc, const char **argv, llvm::cl::OptionCategory &Category,
158 llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
159 CommonOptionsParser Parser;
160 llvm::Error Err =
161 Parser.init(argc, argv, Category, OccurrencesFlag, Overview);
162 if (Err)
163 return std::move(Err);
164 return std::move(Parser);
165 }
166
CommonOptionsParser(int & argc,const char ** argv,cl::OptionCategory & Category,llvm::cl::NumOccurrencesFlag OccurrencesFlag,const char * Overview)167 CommonOptionsParser::CommonOptionsParser(
168 int &argc, const char **argv, cl::OptionCategory &Category,
169 llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
170 llvm::Error Err = init(argc, argv, Category, OccurrencesFlag, Overview);
171 if (Err) {
172 llvm::report_fatal_error(
173 Twine("CommonOptionsParser: failed to parse command-line arguments. ") +
174 llvm::toString(std::move(Err)));
175 }
176 }
177