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"
43 /// Specifies the working directory and command of a compilation.
44 struct CompileCommand {
45 CompileCommand() = default;
46 CompileCommand(Twine Directory, Twine Filename,
47 std::vector<std::string> CommandLine, Twine Output)
48 : Directory(Directory.str()), Filename(Filename.str()),
49 CommandLine(std::move(CommandLine)), Output(Output.str()){}
51 /// The working directory the command was executed from.
52 std::string Directory;
54 /// The source file associated with the command.
57 /// The command line that was executed.
58 std::vector<std::string> CommandLine;
60 /// The output file associated with the command.
63 friend bool operator==(const CompileCommand &LHS, const CompileCommand &RHS) {
64 return LHS.Directory == RHS.Directory && LHS.Filename == RHS.Filename &&
65 LHS.CommandLine == RHS.CommandLine && LHS.Output == RHS.Output;
68 friend bool operator!=(const CompileCommand &LHS, const CompileCommand &RHS) {
73 /// Interface for compilation databases.
75 /// A compilation database allows the user to retrieve compile command lines
76 /// for the files in a project.
78 /// Many implementations are enumerable, allowing all command lines to be
79 /// retrieved. These can be used to run clang tools over a subset of the files
81 class CompilationDatabase {
83 virtual ~CompilationDatabase();
85 /// 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 /// 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 /// 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 /// Returns all compile commands in which the specified file was
117 /// This includes compile commands 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 /// Returns the list of all files available in the compilation database.
128 /// By default, returns nothing. Implementations should override this if they
129 /// can enumerate their source files.
130 virtual std::vector<std::string> getAllFiles() const { return {}; }
132 /// Returns all compile commands for all the files in the compilation
135 /// FIXME: Add a layer in Tooling that provides an interface to run a tool
136 /// over all files in a compilation database. Not all build systems have the
137 /// ability to provide a feasible implementation for \c getAllCompileCommands.
139 /// By default, this is implemented in terms of getAllFiles() and
140 /// getCompileCommands(). Subclasses may override this for efficiency.
141 virtual std::vector<CompileCommand> getAllCompileCommands() const;
144 /// Interface for compilation database plugins.
146 /// A compilation database plugin allows the user to register custom compilation
147 /// databases that are picked up as compilation database if the corresponding
148 /// library is linked in. To register a plugin, declare a static variable like:
151 /// static CompilationDatabasePluginRegistry::Add<MyDatabasePlugin>
152 /// X("my-compilation-database", "Reads my own compilation database");
154 class CompilationDatabasePlugin {
156 virtual ~CompilationDatabasePlugin();
158 /// Loads a compilation database from a build directory.
160 /// \see CompilationDatabase::loadFromDirectory().
161 virtual std::unique_ptr<CompilationDatabase>
162 loadFromDirectory(StringRef Directory, std::string &ErrorMessage) = 0;
165 /// A compilation database that returns a single compile command line.
167 /// Useful when we want a tool to behave more like a compiler invocation.
168 /// This compilation database is not enumerable: getAllFiles() returns {}.
169 class FixedCompilationDatabase : public CompilationDatabase {
171 /// Creates a FixedCompilationDatabase from the arguments after "--".
173 /// Parses the given command line for "--". If "--" is found, the rest of
174 /// the arguments will make up the command line in the returned
175 /// FixedCompilationDatabase.
176 /// The arguments after "--" must not include positional parameters or the
177 /// argv[0] of the tool. Those will be added by the FixedCompilationDatabase
178 /// when a CompileCommand is requested. The argv[0] of the returned command
179 /// line will be "clang-tool".
181 /// Returns NULL in case "--" is not found.
183 /// The argument list is meant to be compatible with normal llvm command line
184 /// parsing in main methods.
185 /// int main(int argc, char **argv) {
186 /// std::unique_ptr<FixedCompilationDatabase> Compilations(
187 /// FixedCompilationDatabase::loadFromCommandLine(argc, argv));
188 /// cl::ParseCommandLineOptions(argc, argv);
192 /// \param Argc The number of command line arguments - will be changed to
193 /// the number of arguments before "--", if "--" was found in the argument
195 /// \param Argv Points to the command line arguments.
196 /// \param ErrorMsg Contains error text if the function returns null pointer.
197 /// \param Directory The base directory used in the FixedCompilationDatabase.
198 static std::unique_ptr<FixedCompilationDatabase> loadFromCommandLine(
199 int &Argc, const char *const *Argv, std::string &ErrorMsg,
200 Twine Directory = ".");
202 /// Reads flags from the given file, one-per line.
203 /// Returns nullptr and sets ErrorMessage if we can't read the file.
204 static std::unique_ptr<FixedCompilationDatabase>
205 loadFromFile(StringRef Path, std::string &ErrorMsg);
207 /// Constructs a compilation data base from a specified directory
208 /// and command line.
209 FixedCompilationDatabase(Twine Directory, ArrayRef<std::string> CommandLine);
211 /// Returns the given compile command.
213 /// Will always return a vector with one entry that contains the directory
214 /// and command line specified at construction with "clang-tool" as argv[0]
215 /// and 'FilePath' as positional argument.
216 std::vector<CompileCommand>
217 getCompileCommands(StringRef FilePath) const override;
220 /// This is built up to contain a single entry vector to be returned from
221 /// getCompileCommands after adding the positional argument.
222 std::vector<CompileCommand> CompileCommands;
225 /// Returns a wrapped CompilationDatabase that defers to the provided one,
226 /// but getCompileCommands() will infer commands for unknown files.
227 /// The return value of getAllFiles() or getAllCompileCommands() is unchanged.
228 /// See InterpolatingCompilationDatabase.cpp for details on heuristics.
229 std::unique_ptr<CompilationDatabase>
230 inferMissingCompileCommands(std::unique_ptr<CompilationDatabase>);
232 } // namespace tooling
235 #endif // LLVM_CLANG_TOOLING_COMPILATIONDATABASE_H