1 //===--- CommonOptionsParser.cpp - common options for clang tools ---------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the CommonOptionsParser class used to parse common
11 // command-line options for clang tools, so that they can be run as separate
12 // command-line applications with a consistent common interface for handling
13 // compilation database and input files.
14 //
15 // It provides a common subset of command-line options, common algorithm
16 // for locating a compilation database and source files, and help messages
17 // for the basic command-line interface.
18 //
19 // It creates a CompilationDatabase and reads common command-line options.
20 //
21 // This class uses the Clang Tooling infrastructure, see
22 // http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html
23 // for details on setting it up with LLVM source tree.
24 //
25 //===----------------------------------------------------------------------===//
26
27 #include "clang/Tooling/CommonOptionsParser.h"
28 #include "clang/Tooling/Tooling.h"
29 #include "llvm/Support/CommandLine.h"
30
31 using namespace clang::tooling;
32 using namespace llvm;
33
34 const char *const CommonOptionsParser::HelpMessage =
35 "\n"
36 "-p <build-path> is used to read a compile command database.\n"
37 "\n"
38 "\tFor example, it can be a CMake build directory in which a file named\n"
39 "\tcompile_commands.json exists (use -DCMAKE_EXPORT_COMPILE_COMMANDS=ON\n"
40 "\tCMake option to get this output). When no build path is specified,\n"
41 "\ta search for compile_commands.json will be attempted through all\n"
42 "\tparent paths of the first input file . See:\n"
43 "\thttp://clang.llvm.org/docs/HowToSetupToolingForLLVM.html for an\n"
44 "\texample of setting up Clang Tooling on a source tree.\n"
45 "\n"
46 "<source0> ... specify the paths of source files. These paths are\n"
47 "\tlooked up in the compile command database. If the path of a file is\n"
48 "\tabsolute, it needs to point into CMake's source tree. If the path is\n"
49 "\trelative, the current working directory needs to be in the CMake\n"
50 "\tsource tree and the file must be in a subdirectory of the current\n"
51 "\tworking directory. \"./\" prefixes in the relative files will be\n"
52 "\tautomatically removed, but the rest of a relative path must be a\n"
53 "\tsuffix of a path in the compile command database.\n"
54 "\n";
55
appendArgumentsAdjuster(ArgumentsAdjuster Adjuster)56 void ArgumentsAdjustingCompilations::appendArgumentsAdjuster(
57 ArgumentsAdjuster Adjuster) {
58 Adjusters.push_back(std::move(Adjuster));
59 }
60
getCompileCommands(StringRef FilePath) const61 std::vector<CompileCommand> ArgumentsAdjustingCompilations::getCompileCommands(
62 StringRef FilePath) const {
63 return adjustCommands(Compilations->getCompileCommands(FilePath));
64 }
65
66 std::vector<std::string>
getAllFiles() const67 ArgumentsAdjustingCompilations::getAllFiles() const {
68 return Compilations->getAllFiles();
69 }
70
71 std::vector<CompileCommand>
getAllCompileCommands() const72 ArgumentsAdjustingCompilations::getAllCompileCommands() const {
73 return adjustCommands(Compilations->getAllCompileCommands());
74 }
75
adjustCommands(std::vector<CompileCommand> Commands) const76 std::vector<CompileCommand> ArgumentsAdjustingCompilations::adjustCommands(
77 std::vector<CompileCommand> Commands) const {
78 for (CompileCommand &Command : Commands)
79 for (const auto &Adjuster : Adjusters)
80 Command.CommandLine = Adjuster(Command.CommandLine, Command.Filename);
81 return Commands;
82 }
83
init(int & argc,const char ** argv,cl::OptionCategory & Category,llvm::cl::NumOccurrencesFlag OccurrencesFlag,const char * Overview)84 llvm::Error CommonOptionsParser::init(
85 int &argc, const char **argv, cl::OptionCategory &Category,
86 llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
87 static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden,
88 cl::sub(*cl::AllSubCommands));
89
90 static cl::opt<std::string> BuildPath("p", cl::desc("Build path"),
91 cl::Optional, cl::cat(Category),
92 cl::sub(*cl::AllSubCommands));
93
94 static cl::list<std::string> SourcePaths(
95 cl::Positional, cl::desc("<source0> [... <sourceN>]"), OccurrencesFlag,
96 cl::cat(Category), cl::sub(*cl::AllSubCommands));
97
98 static cl::list<std::string> ArgsAfter(
99 "extra-arg",
100 cl::desc("Additional argument to append to the compiler command line"),
101 cl::cat(Category), cl::sub(*cl::AllSubCommands));
102
103 static cl::list<std::string> ArgsBefore(
104 "extra-arg-before",
105 cl::desc("Additional argument to prepend to the compiler command line"),
106 cl::cat(Category), cl::sub(*cl::AllSubCommands));
107
108 cl::ResetAllOptionOccurrences();
109
110 cl::HideUnrelatedOptions(Category);
111
112 std::string ErrorMessage;
113 Compilations =
114 FixedCompilationDatabase::loadFromCommandLine(argc, argv, ErrorMessage);
115 if (!ErrorMessage.empty())
116 ErrorMessage.append("\n");
117 llvm::raw_string_ostream OS(ErrorMessage);
118 // Stop initializing if command-line option parsing failed.
119 if (!cl::ParseCommandLineOptions(argc, argv, Overview, &OS)) {
120 OS.flush();
121 return llvm::make_error<llvm::StringError>("[CommonOptionsParser]: " +
122 ErrorMessage,
123 llvm::inconvertibleErrorCode());
124 }
125
126 cl::PrintOptionValues();
127
128 SourcePathList = SourcePaths;
129 if ((OccurrencesFlag == cl::ZeroOrMore || OccurrencesFlag == cl::Optional) &&
130 SourcePathList.empty())
131 return llvm::Error::success();
132 if (!Compilations) {
133 if (!BuildPath.empty()) {
134 Compilations =
135 CompilationDatabase::autoDetectFromDirectory(BuildPath, ErrorMessage);
136 } else {
137 Compilations = CompilationDatabase::autoDetectFromSource(SourcePaths[0],
138 ErrorMessage);
139 }
140 if (!Compilations) {
141 llvm::errs() << "Error while trying to load a compilation database:\n"
142 << ErrorMessage << "Running without flags.\n";
143 Compilations.reset(
144 new FixedCompilationDatabase(".", std::vector<std::string>()));
145 }
146 }
147 auto AdjustingCompilations =
148 llvm::make_unique<ArgumentsAdjustingCompilations>(
149 std::move(Compilations));
150 Adjuster =
151 getInsertArgumentAdjuster(ArgsBefore, ArgumentInsertPosition::BEGIN);
152 Adjuster = combineAdjusters(
153 std::move(Adjuster),
154 getInsertArgumentAdjuster(ArgsAfter, ArgumentInsertPosition::END));
155 AdjustingCompilations->appendArgumentsAdjuster(Adjuster);
156 Compilations = std::move(AdjustingCompilations);
157 return llvm::Error::success();
158 }
159
create(int & argc,const char ** argv,llvm::cl::OptionCategory & Category,llvm::cl::NumOccurrencesFlag OccurrencesFlag,const char * Overview)160 llvm::Expected<CommonOptionsParser> CommonOptionsParser::create(
161 int &argc, const char **argv, llvm::cl::OptionCategory &Category,
162 llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
163 CommonOptionsParser Parser;
164 llvm::Error Err =
165 Parser.init(argc, argv, Category, OccurrencesFlag, Overview);
166 if (Err)
167 return std::move(Err);
168 return std::move(Parser);
169 }
170
CommonOptionsParser(int & argc,const char ** argv,cl::OptionCategory & Category,llvm::cl::NumOccurrencesFlag OccurrencesFlag,const char * Overview)171 CommonOptionsParser::CommonOptionsParser(
172 int &argc, const char **argv, cl::OptionCategory &Category,
173 llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
174 llvm::Error Err = init(argc, argv, Category, OccurrencesFlag, Overview);
175 if (Err) {
176 llvm::report_fatal_error(
177 "CommonOptionsParser: failed to parse command-line arguments. " +
178 llvm::toString(std::move(Err)));
179 }
180 }
181