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brintos / llvm-project-archived public Read only

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1//===- FileList.cpp ---------------------------------------------*- C++ -*-===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "clang/InstallAPI/FileList.h"10#include "llvm/ADT/StringSwitch.h"11#include "llvm/Support/Error.h"12#include "llvm/Support/JSON.h"13#include "llvm/TextAPI/TextAPIError.h"14#include <optional>15 16// clang-format off17/*18InstallAPI JSON Input Format specification.19 20{21  "headers" : [                              # Required: Key must exist.22    {                                        # Optional: May contain 0 or more header inputs.23      "path" : "/usr/include/mach-o/dlfn.h", # Required: Path should point to destination24                                             #           location where applicable.25      "type" : "public",                     # Required: Maps to HeaderType for header.26      "language": "c++"                      # Optional: Language mode for header.27    }28  ],29  "version" : "3"                            # Required: Version 3 supports language mode30                                                         & project header input.31}32*/33// clang-format on34 35using namespace llvm;36using namespace llvm::json;37using namespace llvm::MachO;38using namespace clang::installapi;39 40namespace {41class Implementation {42private:43  Expected<StringRef> parseString(const Object *Obj, StringRef Key,44                                  StringRef Error);45  Expected<StringRef> parsePath(const Object *Obj);46  Expected<HeaderType> parseType(const Object *Obj);47  std::optional<clang::Language> parseLanguage(const Object *Obj);48  Error parseHeaders(Array &Headers);49 50public:51  std::unique_ptr<MemoryBuffer> InputBuffer;52  clang::FileManager *FM;53  unsigned Version;54  HeaderSeq HeaderList;55 56  Error parse(StringRef Input);57};58 59Expected<StringRef>60Implementation::parseString(const Object *Obj, StringRef Key, StringRef Error) {61  auto Str = Obj->getString(Key);62  if (!Str)63    return make_error<StringError>(Error, inconvertibleErrorCode());64  return *Str;65}66 67Expected<HeaderType> Implementation::parseType(const Object *Obj) {68  auto TypeStr =69      parseString(Obj, "type", "required field 'type' not specified");70  if (!TypeStr)71    return TypeStr.takeError();72 73  if (*TypeStr == "public")74    return HeaderType::Public;75  else if (*TypeStr == "private")76    return HeaderType::Private;77  else if (*TypeStr == "project" && Version >= 2)78    return HeaderType::Project;79 80  return make_error<TextAPIError>(TextAPIErrorCode::InvalidInputFormat,81                                  "unsupported header type");82}83 84Expected<StringRef> Implementation::parsePath(const Object *Obj) {85  auto Path = parseString(Obj, "path", "required field 'path' not specified");86  if (!Path)87    return Path.takeError();88 89  return *Path;90}91 92std::optional<clang::Language>93Implementation::parseLanguage(const Object *Obj) {94  auto Language = Obj->getString("language");95  if (!Language)96    return std::nullopt;97 98  return StringSwitch<clang::Language>(*Language)99      .Case("c", clang::Language::C)100      .Case("c++", clang::Language::CXX)101      .Case("objective-c", clang::Language::ObjC)102      .Case("objective-c++", clang::Language::ObjCXX)103      .Default(clang::Language::Unknown);104}105 106Error Implementation::parseHeaders(Array &Headers) {107  for (const auto &H : Headers) {108    auto *Obj = H.getAsObject();109    if (!Obj)110      return make_error<StringError>("expect a JSON object",111                                     inconvertibleErrorCode());112    auto Type = parseType(Obj);113    if (!Type)114      return Type.takeError();115    auto Path = parsePath(Obj);116    if (!Path)117      return Path.takeError();118    auto Language = parseLanguage(Obj);119 120    StringRef PathStr = *Path;121    if (*Type == HeaderType::Project) {122      HeaderList.emplace_back(123          HeaderFile{PathStr, *Type, /*IncludeName=*/"", Language});124      continue;125    }126 127    if (FM)128      if (!FM->getOptionalFileRef(PathStr))129        return createFileError(130            PathStr, make_error_code(std::errc::no_such_file_or_directory));131 132    auto IncludeName = createIncludeHeaderName(PathStr);133    HeaderList.emplace_back(PathStr, *Type,134                            IncludeName.has_value() ? IncludeName.value() : "",135                            Language);136  }137 138  return Error::success();139}140 141Error Implementation::parse(StringRef Input) {142  auto Val = json::parse(Input);143  if (!Val)144    return Val.takeError();145 146  auto *Root = Val->getAsObject();147  if (!Root)148    return make_error<StringError>("not a JSON object",149                                   inconvertibleErrorCode());150 151  auto VersionStr = Root->getString("version");152  if (!VersionStr)153    return make_error<TextAPIError>(TextAPIErrorCode::InvalidInputFormat,154                                    "required field 'version' not specified");155  if (VersionStr->getAsInteger(10, Version))156    return make_error<TextAPIError>(TextAPIErrorCode::InvalidInputFormat,157                                    "invalid version number");158 159  if (Version < 1 || Version > 3)160    return make_error<TextAPIError>(TextAPIErrorCode::InvalidInputFormat,161                                    "unsupported version");162 163  // Not specifying any header files should be atypical, but valid.164  auto Headers = Root->getArray("headers");165  if (!Headers)166    return Error::success();167 168  Error Err = parseHeaders(*Headers);169  if (Err)170    return Err;171 172  return Error::success();173}174} // namespace175 176llvm::Error177FileListReader::loadHeaders(std::unique_ptr<MemoryBuffer> InputBuffer,178                            HeaderSeq &Destination, clang::FileManager *FM) {179  Implementation Impl;180  Impl.InputBuffer = std::move(InputBuffer);181  Impl.FM = FM;182 183  if (llvm::Error Err = Impl.parse(Impl.InputBuffer->getBuffer()))184    return Err;185 186  Destination.reserve(Destination.size() + Impl.HeaderList.size());187  llvm::move(Impl.HeaderList, std::back_inserter(Destination));188 189  return Error::success();190}191