1 //===--- CompilationDatabase.h - --------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides an interface and multiple implementations for
11 // CompilationDatabases.
13 // While C++ refactoring and analysis tools are not compilers, and thus
14 // don't run as part of the build system, they need the exact information
15 // of a build in order to be able to correctly understand the C++ code of
16 // the project. This information is provided via the CompilationDatabase
19 // To create a CompilationDatabase from a build directory one can call
20 // CompilationDatabase::loadFromDirectory(), which deduces the correct
21 // compilation database from the root of the build tree.
23 // See the concrete subclasses of CompilationDatabase for currently supported
26 //===----------------------------------------------------------------------===//
28 #ifndef LLVM_CLANG_TOOLING_COMPILATIONDATABASE_H
29 #define LLVM_CLANG_TOOLING_COMPILATIONDATABASE_H
31 #include "clang/Basic/LLVM.h"
32 #include "llvm/ADT/ArrayRef.h"
33 #include "llvm/ADT/StringRef.h"
34 #include "llvm/ADT/Twine.h"
42 /// \brief Specifies the working directory and command of a compilation.
43 struct CompileCommand {
45 CompileCommand(Twine Directory, Twine Filename,
46 std::vector<std::string> CommandLine, Twine Output)
47 : Directory(Directory.str()),
48 Filename(Filename.str()),
49 CommandLine(std::move(CommandLine)),
50 Output(Output.str()){}
52 /// \brief The working directory the command was executed from.
53 std::string Directory;
55 /// The source file associated with the command.
58 /// \brief The command line that was executed.
59 std::vector<std::string> CommandLine;
61 /// The output file associated with the command.
64 /// \brief An optional mapping from each file's path to its content for all
65 /// files needed for the compilation that are not available via the file
68 /// Note that a tool implementation is required to fall back to the file
69 /// system if a source file is not provided in the mapped sources, as
70 /// compilation databases will usually not provide all files in mapped sources
71 /// for performance reasons.
72 std::vector<std::pair<std::string, std::string> > MappedSources;
75 /// \brief Interface for compilation databases.
77 /// A compilation database allows the user to retrieve all compile command lines
78 /// that a specified file is compiled with in a project.
79 /// The retrieved compile command lines can be used to run clang tools over
80 /// a subset of the files in a project.
81 class CompilationDatabase {
83 virtual ~CompilationDatabase();
85 /// \brief Loads a compilation database from a build directory.
87 /// Looks at the specified 'BuildDirectory' and creates a compilation database
88 /// that allows to query compile commands for source files in the
89 /// corresponding source tree.
91 /// Returns NULL and sets ErrorMessage if we were not able to build up a
92 /// compilation database for the build directory.
94 /// FIXME: Currently only supports JSON compilation databases, which
95 /// are named 'compile_commands.json' in the given directory. Extend this
96 /// for other build types (like ninja build files).
97 static std::unique_ptr<CompilationDatabase>
98 loadFromDirectory(StringRef BuildDirectory, std::string &ErrorMessage);
100 /// \brief Tries to detect a compilation database location and load it.
102 /// Looks for a compilation database in all parent paths of file 'SourceFile'
103 /// by calling loadFromDirectory.
104 static std::unique_ptr<CompilationDatabase>
105 autoDetectFromSource(StringRef SourceFile, std::string &ErrorMessage);
107 /// \brief Tries to detect a compilation database location and load it.
109 /// Looks for a compilation database in directory 'SourceDir' and all
110 /// its parent paths by calling loadFromDirectory.
111 static std::unique_ptr<CompilationDatabase>
112 autoDetectFromDirectory(StringRef SourceDir, std::string &ErrorMessage);
114 /// \brief Returns all compile commands in which the specified file was
117 /// This includes compile comamnds that span multiple source files.
118 /// For example, consider a project with the following compilations:
119 /// $ clang++ -o test a.cc b.cc t.cc
120 /// $ clang++ -o production a.cc b.cc -DPRODUCTION
121 /// A compilation database representing the project would return both command
122 /// lines for a.cc and b.cc and only the first command line for t.cc.
123 virtual std::vector<CompileCommand> getCompileCommands(
124 StringRef FilePath) const = 0;
126 /// \brief Returns the list of all files available in the compilation database.
127 virtual std::vector<std::string> getAllFiles() const = 0;
129 /// \brief Returns all compile commands for all the files in the compilation
132 /// FIXME: Add a layer in Tooling that provides an interface to run a tool
133 /// over all files in a compilation database. Not all build systems have the
134 /// ability to provide a feasible implementation for \c getAllCompileCommands.
135 virtual std::vector<CompileCommand> getAllCompileCommands() const = 0;
138 /// \brief Interface for compilation database plugins.
140 /// A compilation database plugin allows the user to register custom compilation
141 /// databases that are picked up as compilation database if the corresponding
142 /// library is linked in. To register a plugin, declare a static variable like:
145 /// static CompilationDatabasePluginRegistry::Add<MyDatabasePlugin>
146 /// X("my-compilation-database", "Reads my own compilation database");
148 class CompilationDatabasePlugin {
150 virtual ~CompilationDatabasePlugin();
152 /// \brief Loads a compilation database from a build directory.
154 /// \see CompilationDatabase::loadFromDirectory().
155 virtual std::unique_ptr<CompilationDatabase>
156 loadFromDirectory(StringRef Directory, std::string &ErrorMessage) = 0;
159 /// \brief A compilation database that returns a single compile command line.
161 /// Useful when we want a tool to behave more like a compiler invocation.
162 class FixedCompilationDatabase : public CompilationDatabase {
164 /// \brief Creates a FixedCompilationDatabase from the arguments after "--".
166 /// Parses the given command line for "--". If "--" is found, the rest of
167 /// the arguments will make up the command line in the returned
168 /// FixedCompilationDatabase.
169 /// The arguments after "--" must not include positional parameters or the
170 /// argv[0] of the tool. Those will be added by the FixedCompilationDatabase
171 /// when a CompileCommand is requested. The argv[0] of the returned command
172 /// line will be "clang-tool".
174 /// Returns NULL in case "--" is not found.
176 /// The argument list is meant to be compatible with normal llvm command line
177 /// parsing in main methods.
178 /// int main(int argc, char **argv) {
179 /// std::unique_ptr<FixedCompilationDatabase> Compilations(
180 /// FixedCompilationDatabase::loadFromCommandLine(argc, argv));
181 /// cl::ParseCommandLineOptions(argc, argv);
185 /// \param Argc The number of command line arguments - will be changed to
186 /// the number of arguments before "--", if "--" was found in the argument
188 /// \param Argv Points to the command line arguments.
189 /// \param Directory The base directory used in the FixedCompilationDatabase.
190 static FixedCompilationDatabase *loadFromCommandLine(int &Argc,
191 const char *const *Argv,
192 Twine Directory = ".");
194 /// \brief Constructs a compilation data base from a specified directory
195 /// and command line.
196 FixedCompilationDatabase(Twine Directory, ArrayRef<std::string> CommandLine);
198 /// \brief Returns the given compile command.
200 /// Will always return a vector with one entry that contains the directory
201 /// and command line specified at construction with "clang-tool" as argv[0]
202 /// and 'FilePath' as positional argument.
203 std::vector<CompileCommand>
204 getCompileCommands(StringRef FilePath) const override;
206 /// \brief Returns the list of all files available in the compilation database.
208 /// Note: This is always an empty list for the fixed compilation database.
209 std::vector<std::string> getAllFiles() const override;
211 /// \brief Returns all compile commands for all the files in the compilation
214 /// Note: This is always an empty list for the fixed compilation database.
215 std::vector<CompileCommand> getAllCompileCommands() const override;
218 /// This is built up to contain a single entry vector to be returned from
219 /// getCompileCommands after adding the positional argument.
220 std::vector<CompileCommand> CompileCommands;
223 } // end namespace tooling
224 } // end namespace clang