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