blob: cf35a2566637b661d063ab3137162bf2de605081 [file] [log] [blame]
//===--- 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