1 //===--- CompilationDatabase.cpp - ----------------------------------------===//
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 contains multiple implementations for CompilationDatabases.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Tooling/CompilationDatabase.h"
15 #include "llvm/ADT/SmallString.h"
16 #include "llvm/Support/YAMLParser.h"
17 #include "llvm/Support/Path.h"
18 #include "llvm/Support/system_error.h"
25 /// \brief A parser for escaped strings of command line arguments.
27 /// Assumes \-escaping for quoted arguments (see the documentation of
28 /// unescapeCommandLine(...)).
29 class CommandLineArgumentParser {
31 CommandLineArgumentParser(StringRef CommandLine)
32 : Input(CommandLine), Position(Input.begin()-1) {}
34 std::vector<std::string> parse() {
35 bool HasMoreInput = true;
36 while (HasMoreInput && nextNonWhitespace()) {
38 HasMoreInput = parseStringInto(Argument);
39 CommandLine.push_back(Argument);
45 // All private methods return true if there is more input available.
47 bool parseStringInto(std::string &String) {
49 if (*Position == '"') {
50 if (!parseQuotedStringInto(String)) return false;
52 if (!parseFreeStringInto(String)) return false;
54 } while (*Position != ' ');
58 bool parseQuotedStringInto(std::string &String) {
59 if (!next()) return false;
60 while (*Position != '"') {
61 if (!skipEscapeCharacter()) return false;
62 String.push_back(*Position);
63 if (!next()) return false;
68 bool parseFreeStringInto(std::string &String) {
70 if (!skipEscapeCharacter()) return false;
71 String.push_back(*Position);
72 if (!next()) return false;
73 } while (*Position != ' ' && *Position != '"');
77 bool skipEscapeCharacter() {
78 if (*Position == '\\') {
84 bool nextNonWhitespace() {
86 if (!next()) return false;
87 } while (*Position == ' ');
93 return Position != Input.end();
96 const StringRef Input;
97 StringRef::iterator Position;
98 std::vector<std::string> CommandLine;
101 std::vector<std::string> unescapeCommandLine(
102 StringRef EscapedCommandLine) {
103 CommandLineArgumentParser parser(EscapedCommandLine);
104 return parser.parse();
109 CompilationDatabase::~CompilationDatabase() {}
111 CompilationDatabase *
112 CompilationDatabase::loadFromDirectory(StringRef BuildDirectory,
113 std::string &ErrorMessage) {
114 llvm::SmallString<1024> JSONDatabasePath(BuildDirectory);
115 llvm::sys::path::append(JSONDatabasePath, "compile_commands.json");
116 llvm::OwningPtr<CompilationDatabase> Database(
117 JSONCompilationDatabase::loadFromFile(JSONDatabasePath, ErrorMessage));
121 return Database.take();
124 FixedCompilationDatabase *
125 FixedCompilationDatabase::loadFromCommandLine(int &Argc,
128 const char **DoubleDash = std::find(Argv, Argv + Argc, StringRef("--"));
129 if (DoubleDash == Argv + Argc)
131 std::vector<std::string> CommandLine(DoubleDash + 1, Argv + Argc);
132 Argc = DoubleDash - Argv;
133 return new FixedCompilationDatabase(Directory, CommandLine);
136 FixedCompilationDatabase::
137 FixedCompilationDatabase(Twine Directory, ArrayRef<std::string> CommandLine) {
138 std::vector<std::string> ToolCommandLine(1, "clang-tool");
139 ToolCommandLine.insert(ToolCommandLine.end(),
140 CommandLine.begin(), CommandLine.end());
141 CompileCommands.push_back(CompileCommand(Directory, ToolCommandLine));
144 std::vector<CompileCommand>
145 FixedCompilationDatabase::getCompileCommands(StringRef FilePath) const {
146 std::vector<CompileCommand> Result(CompileCommands);
147 Result[0].CommandLine.push_back(FilePath);
151 JSONCompilationDatabase *
152 JSONCompilationDatabase::loadFromFile(StringRef FilePath,
153 std::string &ErrorMessage) {
154 llvm::OwningPtr<llvm::MemoryBuffer> DatabaseBuffer;
155 llvm::error_code Result =
156 llvm::MemoryBuffer::getFile(FilePath, DatabaseBuffer);
158 ErrorMessage = "Error while opening JSON database: " + Result.message();
161 llvm::OwningPtr<JSONCompilationDatabase> Database(
162 new JSONCompilationDatabase(DatabaseBuffer.take()));
163 if (!Database->parse(ErrorMessage))
165 return Database.take();
168 JSONCompilationDatabase *
169 JSONCompilationDatabase::loadFromBuffer(StringRef DatabaseString,
170 std::string &ErrorMessage) {
171 llvm::OwningPtr<llvm::MemoryBuffer> DatabaseBuffer(
172 llvm::MemoryBuffer::getMemBuffer(DatabaseString));
173 llvm::OwningPtr<JSONCompilationDatabase> Database(
174 new JSONCompilationDatabase(DatabaseBuffer.take()));
175 if (!Database->parse(ErrorMessage))
177 return Database.take();
180 std::vector<CompileCommand>
181 JSONCompilationDatabase::getCompileCommands(StringRef FilePath) const {
182 llvm::StringMap< std::vector<CompileCommandRef> >::const_iterator
183 CommandsRefI = IndexByFile.find(FilePath);
184 if (CommandsRefI == IndexByFile.end())
185 return std::vector<CompileCommand>();
186 const std::vector<CompileCommandRef> &CommandsRef = CommandsRefI->getValue();
187 std::vector<CompileCommand> Commands;
188 for (int I = 0, E = CommandsRef.size(); I != E; ++I) {
189 llvm::SmallString<8> DirectoryStorage;
190 llvm::SmallString<1024> CommandStorage;
191 Commands.push_back(CompileCommand(
192 // FIXME: Escape correctly:
193 CommandsRef[I].first->getValue(DirectoryStorage),
194 unescapeCommandLine(CommandsRef[I].second->getValue(CommandStorage))));
199 bool JSONCompilationDatabase::parse(std::string &ErrorMessage) {
200 llvm::yaml::document_iterator I = YAMLStream.begin();
201 if (I == YAMLStream.end()) {
202 ErrorMessage = "Error while parsing YAML.";
205 llvm::yaml::Node *Root = I->getRoot();
207 ErrorMessage = "Error while parsing YAML.";
210 llvm::yaml::SequenceNode *Array =
211 llvm::dyn_cast<llvm::yaml::SequenceNode>(Root);
213 ErrorMessage = "Expected array.";
216 for (llvm::yaml::SequenceNode::iterator AI = Array->begin(),
219 llvm::yaml::MappingNode *Object =
220 llvm::dyn_cast<llvm::yaml::MappingNode>(&*AI);
221 if (Object == NULL) {
222 ErrorMessage = "Expected object.";
225 llvm::yaml::ScalarNode *Directory;
226 llvm::yaml::ScalarNode *Command;
227 llvm::SmallString<8> FileStorage;
228 llvm::StringRef File;
229 for (llvm::yaml::MappingNode::iterator KVI = Object->begin(),
232 llvm::yaml::Node *Value = (*KVI).getValue();
234 ErrorMessage = "Expected value.";
237 llvm::yaml::ScalarNode *ValueString =
238 llvm::dyn_cast<llvm::yaml::ScalarNode>(Value);
239 if (ValueString == NULL) {
240 ErrorMessage = "Expected string as value.";
243 llvm::yaml::ScalarNode *KeyString =
244 llvm::dyn_cast<llvm::yaml::ScalarNode>((*KVI).getKey());
245 llvm::SmallString<8> KeyStorage;
246 if (KeyString->getValue(KeyStorage) == "directory") {
247 Directory = ValueString;
248 } else if (KeyString->getValue(KeyStorage) == "command") {
249 Command = ValueString;
250 } else if (KeyString->getValue(KeyStorage) == "file") {
251 File = ValueString->getValue(FileStorage);
253 ErrorMessage = ("Unknown key: \"" +
254 KeyString->getRawValue() + "\"").str();
258 IndexByFile[File].push_back(
259 CompileCommandRef(Directory, Command));
264 } // end namespace tooling
265 } // end namespace clang