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diff --git a/contrib/llvm/tools/clang/lib/Tooling/JSONCompilationDatabase.cpp b/contrib/llvm/tools/clang/lib/Tooling/JSONCompilationDatabase.cpp
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+//===--- JSONCompilationDatabase.cpp - ------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the implementation of the JSONCompilationDatabase.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Tooling/JSONCompilationDatabase.h"
+
+#include "clang/Tooling/CompilationDatabase.h"
+#include "clang/Tooling/CompilationDatabasePluginRegistry.h"
+#include "clang/Tooling/Tooling.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/system_error.h"
+
+namespace clang {
+namespace tooling {
+
+namespace {
+
+/// \brief 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 (!parseQuotedStringInto(String)) return false;
+ } else {
+ if (!parseFreeStringInto(String)) return false;
+ }
+ } while (*Position != ' ');
+ return true;
+ }
+
+ bool parseQuotedStringInto(std::string &String) {
+ if (!next()) return false;
+ while (*Position != '"') {
+ if (!skipEscapeCharacter()) return false;
+ 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 != '"');
+ 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(
+ StringRef EscapedCommandLine) {
+ CommandLineArgumentParser parser(EscapedCommandLine);
+ return parser.parse();
+}
+
+} // end namespace
+
+class JSONCompilationDatabasePlugin : public CompilationDatabasePlugin {
+ virtual CompilationDatabase *loadFromDirectory(
+ StringRef Directory, std::string &ErrorMessage) {
+ llvm::SmallString<1024> JSONDatabasePath(Directory);
+ llvm::sys::path::append(JSONDatabasePath, "compile_commands.json");
+ llvm::OwningPtr<CompilationDatabase> Database(
+ JSONCompilationDatabase::loadFromFile(JSONDatabasePath, ErrorMessage));
+ if (!Database)
+ return NULL;
+ return Database.take();
+ }
+};
+
+// Register the JSONCompilationDatabasePlugin with the
+// CompilationDatabasePluginRegistry using this statically initialized variable.
+static CompilationDatabasePluginRegistry::Add<JSONCompilationDatabasePlugin>
+X("json-compilation-database", "Reads JSON formatted compilation databases");
+
+// This anchor is used to force the linker to link in the generated object file
+// and thus register the JSONCompilationDatabasePlugin.
+volatile int JSONAnchorSource = 0;
+
+JSONCompilationDatabase *
+JSONCompilationDatabase::loadFromFile(StringRef FilePath,
+ std::string &ErrorMessage) {
+ llvm::OwningPtr<llvm::MemoryBuffer> DatabaseBuffer;
+ llvm::error_code Result =
+ llvm::MemoryBuffer::getFile(FilePath, DatabaseBuffer);
+ if (Result != 0) {
+ ErrorMessage = "Error while opening JSON database: " + Result.message();
+ return NULL;
+ }
+ llvm::OwningPtr<JSONCompilationDatabase> Database(
+ new JSONCompilationDatabase(DatabaseBuffer.take()));
+ if (!Database->parse(ErrorMessage))
+ return NULL;
+ return Database.take();
+}
+
+JSONCompilationDatabase *
+JSONCompilationDatabase::loadFromBuffer(StringRef DatabaseString,
+ std::string &ErrorMessage) {
+ llvm::OwningPtr<llvm::MemoryBuffer> DatabaseBuffer(
+ llvm::MemoryBuffer::getMemBuffer(DatabaseString));
+ llvm::OwningPtr<JSONCompilationDatabase> Database(
+ new JSONCompilationDatabase(DatabaseBuffer.take()));
+ if (!Database->parse(ErrorMessage))
+ return NULL;
+ return Database.take();
+}
+
+std::vector<CompileCommand>
+JSONCompilationDatabase::getCompileCommands(StringRef FilePath) const {
+ llvm::SmallString<128> NativeFilePath;
+ llvm::sys::path::native(FilePath, NativeFilePath);
+ std::vector<StringRef> PossibleMatches;
+ std::string Error;
+ llvm::raw_string_ostream ES(Error);
+ StringRef Match = MatchTrie.findEquivalent(NativeFilePath.str(), ES);
+ if (Match.empty()) {
+ if (Error.empty())
+ Error = "No match found.";
+ llvm::outs() << Error << "\n";
+ return std::vector<CompileCommand>();
+ }
+ llvm::StringMap< std::vector<CompileCommandRef> >::const_iterator
+ CommandsRefI = IndexByFile.find(Match);
+ if (CommandsRefI == IndexByFile.end())
+ return std::vector<CompileCommand>();
+ const std::vector<CompileCommandRef> &CommandsRef = CommandsRefI->getValue();
+ std::vector<CompileCommand> Commands;
+ for (int I = 0, E = CommandsRef.size(); I != E; ++I) {
+ llvm::SmallString<8> DirectoryStorage;
+ llvm::SmallString<1024> CommandStorage;
+ Commands.push_back(CompileCommand(
+ // FIXME: Escape correctly:
+ CommandsRef[I].first->getValue(DirectoryStorage),
+ unescapeCommandLine(CommandsRef[I].second->getValue(CommandStorage))));
+ }
+ return Commands;
+}
+
+std::vector<std::string>
+JSONCompilationDatabase::getAllFiles() const {
+ std::vector<std::string> Result;
+
+ llvm::StringMap< std::vector<CompileCommandRef> >::const_iterator
+ CommandsRefI = IndexByFile.begin();
+ const llvm::StringMap< std::vector<CompileCommandRef> >::const_iterator
+ CommandsRefEnd = IndexByFile.end();
+ for (; CommandsRefI != CommandsRefEnd; ++CommandsRefI) {
+ Result.push_back(CommandsRefI->first().str());
+ }
+
+ return Result;
+}
+
+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 == NULL) {
+ ErrorMessage = "Error while parsing YAML.";
+ return false;
+ }
+ llvm::yaml::SequenceNode *Array =
+ llvm::dyn_cast<llvm::yaml::SequenceNode>(Root);
+ if (Array == NULL) {
+ ErrorMessage = "Expected array.";
+ return false;
+ }
+ for (llvm::yaml::SequenceNode::iterator AI = Array->begin(),
+ AE = Array->end();
+ AI != AE; ++AI) {
+ llvm::yaml::MappingNode *Object =
+ llvm::dyn_cast<llvm::yaml::MappingNode>(&*AI);
+ if (Object == NULL) {
+ ErrorMessage = "Expected object.";
+ return false;
+ }
+ llvm::yaml::ScalarNode *Directory = NULL;
+ llvm::yaml::ScalarNode *Command = NULL;
+ llvm::yaml::ScalarNode *File = NULL;
+ for (llvm::yaml::MappingNode::iterator KVI = Object->begin(),
+ KVE = Object->end();
+ KVI != KVE; ++KVI) {
+ llvm::yaml::Node *Value = (*KVI).getValue();
+ if (Value == NULL) {
+ ErrorMessage = "Expected value.";
+ return false;
+ }
+ llvm::yaml::ScalarNode *ValueString =
+ llvm::dyn_cast<llvm::yaml::ScalarNode>(Value);
+ if (ValueString == NULL) {
+ ErrorMessage = "Expected string as value.";
+ return false;
+ }
+ llvm::yaml::ScalarNode *KeyString =
+ llvm::dyn_cast<llvm::yaml::ScalarNode>((*KVI).getKey());
+ if (KeyString == NULL) {
+ ErrorMessage = "Expected strings as key.";
+ return false;
+ }
+ llvm::SmallString<8> KeyStorage;
+ if (KeyString->getValue(KeyStorage) == "directory") {
+ Directory = ValueString;
+ } else if (KeyString->getValue(KeyStorage) == "command") {
+ Command = ValueString;
+ } else if (KeyString->getValue(KeyStorage) == "file") {
+ File = ValueString;
+ } else {
+ ErrorMessage = ("Unknown key: \"" +
+ KeyString->getRawValue() + "\"").str();
+ return false;
+ }
+ }
+ if (!File) {
+ ErrorMessage = "Missing key: \"file\".";
+ return false;
+ }
+ if (!Command) {
+ ErrorMessage = "Missing key: \"command\".";
+ return false;
+ }
+ if (!Directory) {
+ ErrorMessage = "Missing key: \"directory\".";
+ return false;
+ }
+ llvm::SmallString<8> FileStorage;
+ StringRef FileName = File->getValue(FileStorage);
+ llvm::SmallString<128> NativeFilePath;
+ if (llvm::sys::path::is_relative(FileName)) {
+ llvm::SmallString<8> DirectoryStorage;
+ llvm::SmallString<128> AbsolutePath(
+ Directory->getValue(DirectoryStorage));
+ llvm::sys::path::append(AbsolutePath, FileName);
+ llvm::sys::path::native(AbsolutePath.str(), NativeFilePath);
+ } else {
+ llvm::sys::path::native(FileName, NativeFilePath);
+ }
+ IndexByFile[NativeFilePath].push_back(
+ CompileCommandRef(Directory, Command));
+ MatchTrie.insert(NativeFilePath.str());
+ }
+ return true;
+}
+
+} // end namespace tooling
+} // end namespace clang
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