Coverage Report

Created: 2021-01-19 06:58

/Users/buildslave/jenkins/workspace/coverage/llvm-project/clang/lib/Tooling/CommonOptionsParser.cpp
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//===--- CommonOptionsParser.cpp - common options for clang tools ---------===//
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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 implements the CommonOptionsParser class used to parse common
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//  command-line options for clang tools, so that they can be run as separate
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//  command-line applications with a consistent common interface for handling
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//  compilation database and input files.
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//
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//  It provides a common subset of command-line options, common algorithm
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//  for locating a compilation database and source files, and help messages
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//  for the basic command-line interface.
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//
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//  It creates a CompilationDatabase and reads common command-line options.
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//
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//  This class uses the Clang Tooling infrastructure, see
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//    http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html
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//  for details on setting it up with LLVM source tree.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Tooling/CommonOptionsParser.h"
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#include "clang/Tooling/Tooling.h"
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#include "llvm/Support/CommandLine.h"
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using namespace clang::tooling;
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using namespace llvm;
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const char *const CommonOptionsParser::HelpMessage =
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    "\n"
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    "-p <build-path> is used to read a compile command database.\n"
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    "\n"
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    "\tFor example, it can be a CMake build directory in which a file named\n"
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    "\tcompile_commands.json exists (use -DCMAKE_EXPORT_COMPILE_COMMANDS=ON\n"
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    "\tCMake option to get this output). When no build path is specified,\n"
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    "\ta search for compile_commands.json will be attempted through all\n"
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    "\tparent paths of the first input file . See:\n"
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    "\thttps://clang.llvm.org/docs/HowToSetupToolingForLLVM.html for an\n"
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    "\texample of setting up Clang Tooling on a source tree.\n"
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    "\n"
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    "<source0> ... specify the paths of source files. These paths are\n"
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    "\tlooked up in the compile command database. If the path of a file is\n"
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    "\tabsolute, it needs to point into CMake's source tree. If the path is\n"
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    "\trelative, the current working directory needs to be in the CMake\n"
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    "\tsource tree and the file must be in a subdirectory of the current\n"
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    "\tworking directory. \"./\" prefixes in the relative files will be\n"
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    "\tautomatically removed, but the rest of a relative path must be a\n"
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    "\tsuffix of a path in the compile command database.\n"
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    "\n";
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void ArgumentsAdjustingCompilations::appendArgumentsAdjuster(
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    ArgumentsAdjuster Adjuster) {
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  Adjusters.push_back(std::move(Adjuster));
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}
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std::vector<CompileCommand> ArgumentsAdjustingCompilations::getCompileCommands(
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    StringRef FilePath) const {
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  return adjustCommands(Compilations->getCompileCommands(FilePath));
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}
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std::vector<std::string>
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ArgumentsAdjustingCompilations::getAllFiles() const {
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  return Compilations->getAllFiles();
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}
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std::vector<CompileCommand>
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ArgumentsAdjustingCompilations::getAllCompileCommands() const {
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  return adjustCommands(Compilations->getAllCompileCommands());
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}
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std::vector<CompileCommand> ArgumentsAdjustingCompilations::adjustCommands(
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    std::vector<CompileCommand> Commands) const {
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  for (CompileCommand &Command : Commands)
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    for (const auto &Adjuster : Adjusters)
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      Command.CommandLine = Adjuster(Command.CommandLine, Command.Filename);
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  return Commands;
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}
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llvm::Error CommonOptionsParser::init(
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    int &argc, const char **argv, cl::OptionCategory &Category,
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    llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
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  static cl::opt<std::string> BuildPath("p", cl::desc("Build path"),
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                                        cl::Optional, cl::cat(Category),
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                                        cl::sub(*cl::AllSubCommands));
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  static cl::list<std::string> SourcePaths(
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      cl::Positional, cl::desc("<source0> [... <sourceN>]"), OccurrencesFlag,
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      cl::cat(Category), cl::sub(*cl::AllSubCommands));
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  static cl::list<std::string> ArgsAfter(
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      "extra-arg",
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      cl::desc("Additional argument to append to the compiler command line"),
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      cl::cat(Category), cl::sub(*cl::AllSubCommands));
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  static cl::list<std::string> ArgsBefore(
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      "extra-arg-before",
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      cl::desc("Additional argument to prepend to the compiler command line"),
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      cl::cat(Category), cl::sub(*cl::AllSubCommands));
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  cl::ResetAllOptionOccurrences();
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  cl::HideUnrelatedOptions(Category);
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  std::string ErrorMessage;
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  Compilations =
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      FixedCompilationDatabase::loadFromCommandLine(argc, argv, ErrorMessage);
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  if (!ErrorMessage.empty())
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    ErrorMessage.append("\n");
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  llvm::raw_string_ostream OS(ErrorMessage);
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  // Stop initializing if command-line option parsing failed.
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  if (!cl::ParseCommandLineOptions(argc, argv, Overview, &OS)) {
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    OS.flush();
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    return llvm::make_error<llvm::StringError>("[CommonOptionsParser]: " +
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                                                   ErrorMessage,
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                                               llvm::inconvertibleErrorCode());
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  }
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  cl::PrintOptionValues();
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  SourcePathList = SourcePaths;
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  if ((OccurrencesFlag == cl::ZeroOrMore || 
OccurrencesFlag == cl::Optional109
) &&
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      SourcePathList.empty())
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    return llvm::Error::success();
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  if (!Compilations) {
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    if (!BuildPath.empty()) {
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      Compilations =
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          CompilationDatabase::autoDetectFromDirectory(BuildPath, ErrorMessage);
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    } else {
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      Compilations = CompilationDatabase::autoDetectFromSource(SourcePaths[0],
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                                                               ErrorMessage);
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    }
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    if (!Compilations) {
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      llvm::errs() << "Error while trying to load a compilation database:\n"
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                   << ErrorMessage << "Running without flags.\n";
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      Compilations.reset(
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          new FixedCompilationDatabase(".", std::vector<std::string>()));
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    }
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  }
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  auto AdjustingCompilations =
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      std::make_unique<ArgumentsAdjustingCompilations>(
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          std::move(Compilations));
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  Adjuster =
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      getInsertArgumentAdjuster(ArgsBefore, ArgumentInsertPosition::BEGIN);
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  Adjuster = combineAdjusters(
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      std::move(Adjuster),
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      getInsertArgumentAdjuster(ArgsAfter, ArgumentInsertPosition::END));
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  AdjustingCompilations->appendArgumentsAdjuster(Adjuster);
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  Compilations = std::move(AdjustingCompilations);
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  return llvm::Error::success();
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}
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llvm::Expected<CommonOptionsParser> CommonOptionsParser::create(
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    int &argc, const char **argv, llvm::cl::OptionCategory &Category,
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    llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
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  CommonOptionsParser Parser;
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  llvm::Error Err =
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      Parser.init(argc, argv, Category, OccurrencesFlag, Overview);
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  if (Err)
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    return std::move(Err);
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  return std::move(Parser);
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}
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CommonOptionsParser::CommonOptionsParser(
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    int &argc, const char **argv, cl::OptionCategory &Category,
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    llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
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  llvm::Error Err = init(argc, argv, Category, OccurrencesFlag, Overview);
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  if (Err) {
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    llvm::report_fatal_error(
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        "CommonOptionsParser: failed to parse command-line arguments. " +
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        llvm::toString(std::move(Err)));
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  }
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}