forked from OSchip/llvm-project
437 lines
15 KiB
C++
437 lines
15 KiB
C++
//===- 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/VirtualFileSystem.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) {
|
|
#ifdef _WIN32
|
|
// Assume Windows command line parsing on Win32
|
|
Syntax = JSONCommandLineSyntax::Windows;
|
|
#else
|
|
Syntax = JSONCommandLineSyntax::Gnu;
|
|
#endif
|
|
}
|
|
|
|
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(expandResponseFiles(
|
|
std::move(Base), llvm::vfs::getRealFileSystem())))
|
|
: 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, /*IsText=*/false,
|
|
/*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::getMemBufferCopy(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" ||
|
|
Wrapper == "sccache") {
|
|
// 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(std::string(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") {
|
|
if (!SequenceString) {
|
|
ErrorMessage = "Expected sequence as value.";
|
|
return false;
|
|
}
|
|
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 (!ValueString) {
|
|
ErrorMessage = "Expected string as value.";
|
|
return false;
|
|
}
|
|
if (KeyValue == "directory") {
|
|
Directory = ValueString;
|
|
} 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;
|
|
}
|