Use LLVM's plugin registry to enable registering new compilation
databases. Move JSONCompilationDatabase.h to its own files and register it as plugin. llvm-svn: 162541
This commit is contained in:
Daniel Jasper
283
clang/lib/Tooling/JSONCompilationDatabase.cpp
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283
clang/lib/Tooling/JSONCompilationDatabase.cpp
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//===--- JSONCompilationDatabase.cpp - ------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the implementation of the JSONCompilationDatabase.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Tooling/JSONCompilationDatabase.h"
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#include "clang/Tooling/CompilationDatabase.h"
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#include "clang/Tooling/CompilationDatabasePluginRegistry.h"
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#include "clang/Tooling/Tooling.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/system_error.h"
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namespace clang {
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namespace tooling {
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namespace {
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/// \brief A parser for escaped strings of command line arguments.
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///
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/// Assumes \-escaping for quoted arguments (see the documentation of
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/// unescapeCommandLine(...)).
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class CommandLineArgumentParser {
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public:
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CommandLineArgumentParser(StringRef CommandLine)
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: Input(CommandLine), Position(Input.begin()-1) {}
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std::vector<std::string> parse() {
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bool HasMoreInput = true;
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while (HasMoreInput && nextNonWhitespace()) {
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std::string Argument;
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HasMoreInput = parseStringInto(Argument);
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CommandLine.push_back(Argument);
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}
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return CommandLine;
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}
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private:
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// All private methods return true if there is more input available.
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bool parseStringInto(std::string &String) {
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do {
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if (*Position == '"') {
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if (!parseQuotedStringInto(String)) return false;
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} else {
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if (!parseFreeStringInto(String)) return false;
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}
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} while (*Position != ' ');
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return true;
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}
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bool parseQuotedStringInto(std::string &String) {
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if (!next()) return false;
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while (*Position != '"') {
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if (!skipEscapeCharacter()) return false;
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String.push_back(*Position);
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if (!next()) return false;
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}
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return next();
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}
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bool parseFreeStringInto(std::string &String) {
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do {
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if (!skipEscapeCharacter()) return false;
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String.push_back(*Position);
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if (!next()) return false;
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} while (*Position != ' ' && *Position != '"');
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return true;
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}
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bool skipEscapeCharacter() {
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if (*Position == '\\') {
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return next();
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}
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return true;
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}
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bool nextNonWhitespace() {
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do {
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if (!next()) return false;
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} while (*Position == ' ');
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return true;
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}
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bool next() {
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++Position;
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return Position != Input.end();
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}
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const StringRef Input;
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StringRef::iterator Position;
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std::vector<std::string> CommandLine;
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};
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std::vector<std::string> unescapeCommandLine(
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StringRef EscapedCommandLine) {
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CommandLineArgumentParser parser(EscapedCommandLine);
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return parser.parse();
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}
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} // end namespace
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class JSONCompilationDatabasePlugin : public CompilationDatabasePlugin {
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virtual CompilationDatabase *loadFromDirectory(
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StringRef Directory, std::string &ErrorMessage) {
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llvm::SmallString<1024> JSONDatabasePath(Directory);
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llvm::sys::path::append(JSONDatabasePath, "compile_commands.json");
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llvm::OwningPtr<CompilationDatabase> Database(
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JSONCompilationDatabase::loadFromFile(JSONDatabasePath, ErrorMessage));
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if (!Database)
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return NULL;
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return Database.take();
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}
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};
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// Register the JSONCompilationDatabasePlugin with the
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// CompilationDatabasePluginRegistry using this statically initialized variable.
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static CompilationDatabasePluginRegistry::Add<JSONCompilationDatabasePlugin>
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X("json-compilation-database", "Reads JSON formatted compilation databases");
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// This anchor is used to force the linker to link in the generated object file
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// and thus register the JSONCompilationDatabasePlugin.
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int JSONAnchorSource = 0;
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JSONCompilationDatabase *
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JSONCompilationDatabase::loadFromFile(StringRef FilePath,
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std::string &ErrorMessage) {
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llvm::OwningPtr<llvm::MemoryBuffer> DatabaseBuffer;
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llvm::error_code Result =
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llvm::MemoryBuffer::getFile(FilePath, DatabaseBuffer);
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if (Result != 0) {
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ErrorMessage = "Error while opening JSON database: " + Result.message();
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return NULL;
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}
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llvm::OwningPtr<JSONCompilationDatabase> Database(
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new JSONCompilationDatabase(DatabaseBuffer.take()));
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if (!Database->parse(ErrorMessage))
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return NULL;
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return Database.take();
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}
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JSONCompilationDatabase *
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JSONCompilationDatabase::loadFromBuffer(StringRef DatabaseString,
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std::string &ErrorMessage) {
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llvm::OwningPtr<llvm::MemoryBuffer> DatabaseBuffer(
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llvm::MemoryBuffer::getMemBuffer(DatabaseString));
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llvm::OwningPtr<JSONCompilationDatabase> Database(
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new JSONCompilationDatabase(DatabaseBuffer.take()));
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if (!Database->parse(ErrorMessage))
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return NULL;
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return Database.take();
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}
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std::vector<CompileCommand>
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JSONCompilationDatabase::getCompileCommands(StringRef FilePath) const {
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llvm::SmallString<128> NativeFilePath;
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llvm::sys::path::native(FilePath, NativeFilePath);
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llvm::StringMap< std::vector<CompileCommandRef> >::const_iterator
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CommandsRefI = IndexByFile.find(NativeFilePath);
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if (CommandsRefI == IndexByFile.end())
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return std::vector<CompileCommand>();
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const std::vector<CompileCommandRef> &CommandsRef = CommandsRefI->getValue();
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std::vector<CompileCommand> Commands;
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for (int I = 0, E = CommandsRef.size(); I != E; ++I) {
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llvm::SmallString<8> DirectoryStorage;
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llvm::SmallString<1024> CommandStorage;
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Commands.push_back(CompileCommand(
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// FIXME: Escape correctly:
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CommandsRef[I].first->getValue(DirectoryStorage),
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unescapeCommandLine(CommandsRef[I].second->getValue(CommandStorage))));
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}
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return Commands;
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}
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std::vector<std::string>
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JSONCompilationDatabase::getAllFiles() const {
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std::vector<std::string> Result;
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llvm::StringMap< std::vector<CompileCommandRef> >::const_iterator
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CommandsRefI = IndexByFile.begin();
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const llvm::StringMap< std::vector<CompileCommandRef> >::const_iterator
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CommandsRefEnd = IndexByFile.end();
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for (; CommandsRefI != CommandsRefEnd; ++CommandsRefI) {
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Result.push_back(CommandsRefI->first().str());
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}
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return Result;
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}
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bool JSONCompilationDatabase::parse(std::string &ErrorMessage) {
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llvm::yaml::document_iterator I = YAMLStream.begin();
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if (I == YAMLStream.end()) {
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ErrorMessage = "Error while parsing YAML.";
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return false;
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}
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llvm::yaml::Node *Root = I->getRoot();
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if (Root == NULL) {
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ErrorMessage = "Error while parsing YAML.";
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return false;
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}
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llvm::yaml::SequenceNode *Array =
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llvm::dyn_cast<llvm::yaml::SequenceNode>(Root);
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if (Array == NULL) {
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ErrorMessage = "Expected array.";
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return false;
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}
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for (llvm::yaml::SequenceNode::iterator AI = Array->begin(),
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AE = Array->end();
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AI != AE; ++AI) {
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llvm::yaml::MappingNode *Object =
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llvm::dyn_cast<llvm::yaml::MappingNode>(&*AI);
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if (Object == NULL) {
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ErrorMessage = "Expected object.";
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return false;
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}
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llvm::yaml::ScalarNode *Directory = NULL;
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llvm::yaml::ScalarNode *Command = NULL;
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llvm::yaml::ScalarNode *File = NULL;
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for (llvm::yaml::MappingNode::iterator KVI = Object->begin(),
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KVE = Object->end();
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KVI != KVE; ++KVI) {
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llvm::yaml::Node *Value = (*KVI).getValue();
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if (Value == NULL) {
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ErrorMessage = "Expected value.";
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return false;
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}
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llvm::yaml::ScalarNode *ValueString =
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llvm::dyn_cast<llvm::yaml::ScalarNode>(Value);
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if (ValueString == NULL) {
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ErrorMessage = "Expected string as value.";
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return false;
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}
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llvm::yaml::ScalarNode *KeyString =
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llvm::dyn_cast<llvm::yaml::ScalarNode>((*KVI).getKey());
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if (KeyString == NULL) {
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ErrorMessage = "Expected strings as key.";
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return false;
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}
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llvm::SmallString<8> KeyStorage;
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if (KeyString->getValue(KeyStorage) == "directory") {
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Directory = ValueString;
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} else if (KeyString->getValue(KeyStorage) == "command") {
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Command = ValueString;
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} else if (KeyString->getValue(KeyStorage) == "file") {
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File = ValueString;
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} else {
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ErrorMessage = ("Unknown key: \"" +
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KeyString->getRawValue() + "\"").str();
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return false;
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}
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}
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if (!File) {
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ErrorMessage = "Missing key: \"file\".";
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return false;
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}
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if (!Command) {
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ErrorMessage = "Missing key: \"command\".";
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return false;
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}
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if (!Directory) {
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ErrorMessage = "Missing key: \"directory\".";
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return false;
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}
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llvm::SmallString<8> FileStorage;
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llvm::SmallString<128> NativeFilePath;
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llvm::sys::path::native(File->getValue(FileStorage), NativeFilePath);
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IndexByFile[NativeFilePath].push_back(
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CompileCommandRef(Directory, Command));
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}
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return true;
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}
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} // end namespace tooling
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} // end namespace clang
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