| //===- JSONCompilationDatabase.cpp ----------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains the implementation of the JSONCompilationDatabase. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/Tooling/JSONCompilationDatabase.h" |
| #include "clang/Basic/LLVM.h" |
| #include "clang/Tooling/CompilationDatabase.h" |
| #include "clang/Tooling/CompilationDatabasePluginRegistry.h" |
| #include "clang/Tooling/Tooling.h" |
| #include "llvm/ADT/Optional.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/ADT/StringRef.h" |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/Support/Allocator.h" |
| #include "llvm/Support/Casting.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/ErrorOr.h" |
| #include "llvm/Support/Host.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| #include "llvm/Support/Path.h" |
| #include "llvm/Support/StringSaver.h" |
| #include "llvm/Support/YAMLParser.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <cassert> |
| #include <memory> |
| #include <string> |
| #include <system_error> |
| #include <tuple> |
| #include <utility> |
| #include <vector> |
| |
| using namespace clang; |
| using namespace tooling; |
| |
| namespace { |
| |
| /// A parser for escaped strings of command line arguments. |
| /// |
| /// Assumes \-escaping for quoted arguments (see the documentation of |
| /// unescapeCommandLine(...)). |
| class CommandLineArgumentParser { |
| public: |
| CommandLineArgumentParser(StringRef CommandLine) |
| : Input(CommandLine), Position(Input.begin()-1) {} |
| |
| std::vector<std::string> parse() { |
| bool HasMoreInput = true; |
| while (HasMoreInput && nextNonWhitespace()) { |
| std::string Argument; |
| HasMoreInput = parseStringInto(Argument); |
| CommandLine.push_back(Argument); |
| } |
| return CommandLine; |
| } |
| |
| private: |
| // All private methods return true if there is more input available. |
| |
| bool parseStringInto(std::string &String) { |
| do { |
| if (*Position == '"') { |
| if (!parseDoubleQuotedStringInto(String)) return false; |
| } else if (*Position == '\'') { |
| if (!parseSingleQuotedStringInto(String)) return false; |
| } else { |
| if (!parseFreeStringInto(String)) return false; |
| } |
| } while (*Position != ' '); |
| return true; |
| } |
| |
| bool parseDoubleQuotedStringInto(std::string &String) { |
| if (!next()) return false; |
| while (*Position != '"') { |
| if (!skipEscapeCharacter()) return false; |
| String.push_back(*Position); |
| if (!next()) return false; |
| } |
| return next(); |
| } |
| |
| bool parseSingleQuotedStringInto(std::string &String) { |
| if (!next()) return false; |
| while (*Position != '\'') { |
| String.push_back(*Position); |
| if (!next()) return false; |
| } |
| return next(); |
| } |
| |
| bool parseFreeStringInto(std::string &String) { |
| do { |
| if (!skipEscapeCharacter()) return false; |
| String.push_back(*Position); |
| if (!next()) return false; |
| } while (*Position != ' ' && *Position != '"' && *Position != '\''); |
| return true; |
| } |
| |
| bool skipEscapeCharacter() { |
| if (*Position == '\\') { |
| return next(); |
| } |
| return true; |
| } |
| |
| bool nextNonWhitespace() { |
| do { |
| if (!next()) return false; |
| } while (*Position == ' '); |
| return true; |
| } |
| |
| bool next() { |
| ++Position; |
| return Position != Input.end(); |
| } |
| |
| const StringRef Input; |
| StringRef::iterator Position; |
| std::vector<std::string> CommandLine; |
| }; |
| |
| std::vector<std::string> unescapeCommandLine(JSONCommandLineSyntax Syntax, |
| StringRef EscapedCommandLine) { |
| if (Syntax == JSONCommandLineSyntax::AutoDetect) { |
| Syntax = JSONCommandLineSyntax::Gnu; |
| llvm::Triple Triple(llvm::sys::getProcessTriple()); |
| if (Triple.getOS() == llvm::Triple::OSType::Win32) { |
| // Assume Windows command line parsing on Win32 unless the triple |
| // explicitly tells us otherwise. |
| if (!Triple.hasEnvironment() || |
| Triple.getEnvironment() == llvm::Triple::EnvironmentType::MSVC) |
| Syntax = JSONCommandLineSyntax::Windows; |
| } |
| } |
| |
| if (Syntax == JSONCommandLineSyntax::Windows) { |
| llvm::BumpPtrAllocator Alloc; |
| llvm::StringSaver Saver(Alloc); |
| llvm::SmallVector<const char *, 64> T; |
| llvm::cl::TokenizeWindowsCommandLine(EscapedCommandLine, Saver, T); |
| std::vector<std::string> Result(T.begin(), T.end()); |
| return Result; |
| } |
| assert(Syntax == JSONCommandLineSyntax::Gnu); |
| CommandLineArgumentParser parser(EscapedCommandLine); |
| return parser.parse(); |
| } |
| |
| // This plugin locates a nearby compile_command.json file, and also infers |
| // compile commands for files not present in the database. |
| class JSONCompilationDatabasePlugin : public CompilationDatabasePlugin { |
| std::unique_ptr<CompilationDatabase> |
| loadFromDirectory(StringRef Directory, std::string &ErrorMessage) override { |
| SmallString<1024> JSONDatabasePath(Directory); |
| llvm::sys::path::append(JSONDatabasePath, "compile_commands.json"); |
| auto Base = JSONCompilationDatabase::loadFromFile( |
| JSONDatabasePath, ErrorMessage, JSONCommandLineSyntax::AutoDetect); |
| return Base ? inferTargetAndDriverMode( |
| inferMissingCompileCommands(std::move(Base))) |
| : nullptr; |
| } |
| }; |
| |
| } // namespace |
| |
| // Register the JSONCompilationDatabasePlugin with the |
| // CompilationDatabasePluginRegistry using this statically initialized variable. |
| static CompilationDatabasePluginRegistry::Add<JSONCompilationDatabasePlugin> |
| X("json-compilation-database", "Reads JSON formatted compilation databases"); |
| |
| namespace clang { |
| namespace tooling { |
| |
| // This anchor is used to force the linker to link in the generated object file |
| // and thus register the JSONCompilationDatabasePlugin. |
| volatile int JSONAnchorSource = 0; |
| |
| } // namespace tooling |
| } // namespace clang |
| |
| std::unique_ptr<JSONCompilationDatabase> |
| JSONCompilationDatabase::loadFromFile(StringRef FilePath, |
| std::string &ErrorMessage, |
| JSONCommandLineSyntax Syntax) { |
| // Don't mmap: if we're a long-lived process, the build system may overwrite. |
| llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> DatabaseBuffer = |
| llvm::MemoryBuffer::getFile(FilePath, /*FileSize=*/-1, |
| /*RequiresNullTerminator=*/true, |
| /*IsVolatile=*/true); |
| if (std::error_code Result = DatabaseBuffer.getError()) { |
| ErrorMessage = "Error while opening JSON database: " + Result.message(); |
| return nullptr; |
| } |
| std::unique_ptr<JSONCompilationDatabase> Database( |
| new JSONCompilationDatabase(std::move(*DatabaseBuffer), Syntax)); |
| if (!Database->parse(ErrorMessage)) |
| return nullptr; |
| return Database; |
| } |
| |
| std::unique_ptr<JSONCompilationDatabase> |
| JSONCompilationDatabase::loadFromBuffer(StringRef DatabaseString, |
| std::string &ErrorMessage, |
| JSONCommandLineSyntax Syntax) { |
| std::unique_ptr<llvm::MemoryBuffer> DatabaseBuffer( |
| llvm::MemoryBuffer::getMemBuffer(DatabaseString)); |
| std::unique_ptr<JSONCompilationDatabase> Database( |
| new JSONCompilationDatabase(std::move(DatabaseBuffer), Syntax)); |
| if (!Database->parse(ErrorMessage)) |
| return nullptr; |
| return Database; |
| } |
| |
| std::vector<CompileCommand> |
| JSONCompilationDatabase::getCompileCommands(StringRef FilePath) const { |
| SmallString<128> NativeFilePath; |
| llvm::sys::path::native(FilePath, NativeFilePath); |
| |
| std::string Error; |
| llvm::raw_string_ostream ES(Error); |
| StringRef Match = MatchTrie.findEquivalent(NativeFilePath, ES); |
| if (Match.empty()) |
| return {}; |
| const auto CommandsRefI = IndexByFile.find(Match); |
| if (CommandsRefI == IndexByFile.end()) |
| return {}; |
| std::vector<CompileCommand> Commands; |
| getCommands(CommandsRefI->getValue(), Commands); |
| return Commands; |
| } |
| |
| std::vector<std::string> |
| JSONCompilationDatabase::getAllFiles() const { |
| std::vector<std::string> Result; |
| for (const auto &CommandRef : IndexByFile) |
| Result.push_back(CommandRef.first().str()); |
| return Result; |
| } |
| |
| std::vector<CompileCommand> |
| JSONCompilationDatabase::getAllCompileCommands() const { |
| std::vector<CompileCommand> Commands; |
| getCommands(AllCommands, Commands); |
| return Commands; |
| } |
| |
| static llvm::StringRef stripExecutableExtension(llvm::StringRef Name) { |
| Name.consume_back(".exe"); |
| return Name; |
| } |
| |
| // There are compiler-wrappers (ccache, distcc, gomacc) that take the "real" |
| // compiler as an argument, e.g. distcc gcc -O3 foo.c. |
| // These end up in compile_commands.json when people set CC="distcc gcc". |
| // Clang's driver doesn't understand this, so we need to unwrap. |
| static bool unwrapCommand(std::vector<std::string> &Args) { |
| if (Args.size() < 2) |
| return false; |
| StringRef Wrapper = |
| stripExecutableExtension(llvm::sys::path::filename(Args.front())); |
| if (Wrapper == "distcc" || Wrapper == "gomacc" || Wrapper == "ccache") { |
| // Most of these wrappers support being invoked 3 ways: |
| // `distcc g++ file.c` This is the mode we're trying to match. |
| // We need to drop `distcc`. |
| // `distcc file.c` This acts like compiler is cc or similar. |
| // Clang's driver can handle this, no change needed. |
| // `g++ file.c` g++ is a symlink to distcc. |
| // We don't even notice this case, and all is well. |
| // |
| // We need to distinguish between the first and second case. |
| // The wrappers themselves don't take flags, so Args[1] is a compiler flag, |
| // an input file, or a compiler. Inputs have extensions, compilers don't. |
| bool HasCompiler = |
| (Args[1][0] != '-') && |
| !llvm::sys::path::has_extension(stripExecutableExtension(Args[1])); |
| if (HasCompiler) { |
| Args.erase(Args.begin()); |
| return true; |
| } |
| // If !HasCompiler, wrappers act like GCC. Fine: so do we. |
| } |
| return false; |
| } |
| |
| static std::vector<std::string> |
| nodeToCommandLine(JSONCommandLineSyntax Syntax, |
| const std::vector<llvm::yaml::ScalarNode *> &Nodes) { |
| SmallString<1024> Storage; |
| std::vector<std::string> Arguments; |
| if (Nodes.size() == 1) |
| Arguments = unescapeCommandLine(Syntax, Nodes[0]->getValue(Storage)); |
| else |
| for (const auto *Node : Nodes) |
| Arguments.push_back(Node->getValue(Storage)); |
| // There may be multiple wrappers: using distcc and ccache together is common. |
| while (unwrapCommand(Arguments)) |
| ; |
| return Arguments; |
| } |
| |
| void JSONCompilationDatabase::getCommands( |
| ArrayRef<CompileCommandRef> CommandsRef, |
| std::vector<CompileCommand> &Commands) const { |
| for (const auto &CommandRef : CommandsRef) { |
| SmallString<8> DirectoryStorage; |
| SmallString<32> FilenameStorage; |
| SmallString<32> OutputStorage; |
| auto Output = std::get<3>(CommandRef); |
| Commands.emplace_back( |
| std::get<0>(CommandRef)->getValue(DirectoryStorage), |
| std::get<1>(CommandRef)->getValue(FilenameStorage), |
| nodeToCommandLine(Syntax, std::get<2>(CommandRef)), |
| Output ? Output->getValue(OutputStorage) : ""); |
| } |
| } |
| |
| bool JSONCompilationDatabase::parse(std::string &ErrorMessage) { |
| llvm::yaml::document_iterator I = YAMLStream.begin(); |
| if (I == YAMLStream.end()) { |
| ErrorMessage = "Error while parsing YAML."; |
| return false; |
| } |
| llvm::yaml::Node *Root = I->getRoot(); |
| if (!Root) { |
| ErrorMessage = "Error while parsing YAML."; |
| return false; |
| } |
| auto *Array = dyn_cast<llvm::yaml::SequenceNode>(Root); |
| if (!Array) { |
| ErrorMessage = "Expected array."; |
| return false; |
| } |
| for (auto &NextObject : *Array) { |
| auto *Object = dyn_cast<llvm::yaml::MappingNode>(&NextObject); |
| if (!Object) { |
| ErrorMessage = "Expected object."; |
| return false; |
| } |
| llvm::yaml::ScalarNode *Directory = nullptr; |
| llvm::Optional<std::vector<llvm::yaml::ScalarNode *>> Command; |
| llvm::yaml::ScalarNode *File = nullptr; |
| llvm::yaml::ScalarNode *Output = nullptr; |
| for (auto& NextKeyValue : *Object) { |
| auto *KeyString = dyn_cast<llvm::yaml::ScalarNode>(NextKeyValue.getKey()); |
| if (!KeyString) { |
| ErrorMessage = "Expected strings as key."; |
| return false; |
| } |
| SmallString<10> KeyStorage; |
| StringRef KeyValue = KeyString->getValue(KeyStorage); |
| llvm::yaml::Node *Value = NextKeyValue.getValue(); |
| if (!Value) { |
| ErrorMessage = "Expected value."; |
| return false; |
| } |
| auto *ValueString = dyn_cast<llvm::yaml::ScalarNode>(Value); |
| auto *SequenceString = dyn_cast<llvm::yaml::SequenceNode>(Value); |
| if (KeyValue == "arguments" && !SequenceString) { |
| ErrorMessage = "Expected sequence as value."; |
| return false; |
| } else if (KeyValue != "arguments" && !ValueString) { |
| ErrorMessage = "Expected string as value."; |
| return false; |
| } |
| if (KeyValue == "directory") { |
| Directory = ValueString; |
| } else if (KeyValue == "arguments") { |
| Command = std::vector<llvm::yaml::ScalarNode *>(); |
| for (auto &Argument : *SequenceString) { |
| auto *Scalar = dyn_cast<llvm::yaml::ScalarNode>(&Argument); |
| if (!Scalar) { |
| ErrorMessage = "Only strings are allowed in 'arguments'."; |
| return false; |
| } |
| Command->push_back(Scalar); |
| } |
| } else if (KeyValue == "command") { |
| if (!Command) |
| Command = std::vector<llvm::yaml::ScalarNode *>(1, ValueString); |
| } else if (KeyValue == "file") { |
| File = ValueString; |
| } else if (KeyValue == "output") { |
| Output = ValueString; |
| } else { |
| ErrorMessage = ("Unknown key: \"" + |
| KeyString->getRawValue() + "\"").str(); |
| return false; |
| } |
| } |
| if (!File) { |
| ErrorMessage = "Missing key: \"file\"."; |
| return false; |
| } |
| if (!Command) { |
| ErrorMessage = "Missing key: \"command\" or \"arguments\"."; |
| return false; |
| } |
| if (!Directory) { |
| ErrorMessage = "Missing key: \"directory\"."; |
| return false; |
| } |
| SmallString<8> FileStorage; |
| StringRef FileName = File->getValue(FileStorage); |
| SmallString<128> NativeFilePath; |
| if (llvm::sys::path::is_relative(FileName)) { |
| SmallString<8> DirectoryStorage; |
| SmallString<128> AbsolutePath( |
| Directory->getValue(DirectoryStorage)); |
| llvm::sys::path::append(AbsolutePath, FileName); |
| llvm::sys::path::remove_dots(AbsolutePath, /*remove_dot_dot=*/ true); |
| llvm::sys::path::native(AbsolutePath, NativeFilePath); |
| } else { |
| llvm::sys::path::native(FileName, NativeFilePath); |
| } |
| auto Cmd = CompileCommandRef(Directory, File, *Command, Output); |
| IndexByFile[NativeFilePath].push_back(Cmd); |
| AllCommands.push_back(Cmd); |
| MatchTrie.insert(NativeFilePath); |
| } |
| return true; |
| } |