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//===- FileList.cpp ---------------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "clang/InstallAPI/FileList.h"
#include "clang/Basic/DiagnosticFrontend.h"
#include "clang/InstallAPI/FileList.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/JSON.h"
#include "llvm/TextAPI/TextAPIError.h"
#include <optional>
// clang-format off
/*
InstallAPI JSON Input Format specification.
{
"headers" : [ # Required: Key must exist.
{ # Optional: May contain 0 or more header inputs.
"path" : "/usr/include/mach-o/dlfn.h", # Required: Path should point to destination
# location where applicable.
"type" : "public", # Required: Maps to HeaderType for header.
"language": "c++" # Optional: Language mode for header.
}
],
"version" : "3" # Required: Version 3 supports language mode
& project header input.
}
*/
// clang-format on
using namespace llvm;
using namespace llvm::json;
using namespace llvm::MachO;
using namespace clang::installapi;
namespace {
class Implementation {
private:
Expected<StringRef> parseString(const Object *Obj, StringRef Key,
StringRef Error);
Expected<StringRef> parsePath(const Object *Obj);
Expected<HeaderType> parseType(const Object *Obj);
std::optional<clang::Language> parseLanguage(const Object *Obj);
Error parseHeaders(Array &Headers);
public:
std::unique_ptr<MemoryBuffer> InputBuffer;
clang::FileManager *FM;
unsigned Version;
HeaderSeq HeaderList;
Error parse(StringRef Input);
};
Expected<StringRef>
Implementation::parseString(const Object *Obj, StringRef Key, StringRef Error) {
auto Str = Obj->getString(Key);
if (!Str)
return make_error<StringError>(Error, inconvertibleErrorCode());
return *Str;
}
Expected<HeaderType> Implementation::parseType(const Object *Obj) {
auto TypeStr =
parseString(Obj, "type", "required field 'type' not specified");
if (!TypeStr)
return TypeStr.takeError();
if (*TypeStr == "public")
return HeaderType::Public;
else if (*TypeStr == "private")
return HeaderType::Private;
else if (*TypeStr == "project" && Version >= 2)
return HeaderType::Project;
return make_error<TextAPIError>(TextAPIErrorCode::InvalidInputFormat,
"unsupported header type");
}
Expected<StringRef> Implementation::parsePath(const Object *Obj) {
auto Path = parseString(Obj, "path", "required field 'path' not specified");
if (!Path)
return Path.takeError();
return *Path;
}
std::optional<clang::Language>
Implementation::parseLanguage(const Object *Obj) {
auto Language = Obj->getString("language");
if (!Language)
return std::nullopt;
return StringSwitch<clang::Language>(*Language)
.Case("c", clang::Language::C)
.Case("c++", clang::Language::CXX)
.Case("objective-c", clang::Language::ObjC)
.Case("objective-c++", clang::Language::ObjCXX)
.Default(clang::Language::Unknown);
}
Error Implementation::parseHeaders(Array &Headers) {
for (const auto &H : Headers) {
auto *Obj = H.getAsObject();
if (!Obj)
return make_error<StringError>("expect a JSON object",
inconvertibleErrorCode());
auto Type = parseType(Obj);
if (!Type)
return Type.takeError();
auto Path = parsePath(Obj);
if (!Path)
return Path.takeError();
auto Language = parseLanguage(Obj);
StringRef PathStr = *Path;
if (*Type == HeaderType::Project) {
HeaderList.emplace_back(
HeaderFile{PathStr, *Type, /*IncludeName=*/"", Language});
continue;
}
if (FM)
if (!FM->getOptionalFileRef(PathStr))
return createFileError(
PathStr, make_error_code(std::errc::no_such_file_or_directory));
auto IncludeName = createIncludeHeaderName(PathStr);
HeaderList.emplace_back(PathStr, *Type,
IncludeName.has_value() ? IncludeName.value() : "",
Language);
}
return Error::success();
}
Error Implementation::parse(StringRef Input) {
auto Val = json::parse(Input);
if (!Val)
return Val.takeError();
auto *Root = Val->getAsObject();
if (!Root)
return make_error<StringError>("not a JSON object",
inconvertibleErrorCode());
auto VersionStr = Root->getString("version");
if (!VersionStr)
return make_error<TextAPIError>(TextAPIErrorCode::InvalidInputFormat,
"required field 'version' not specified");
if (VersionStr->getAsInteger(10, Version))
return make_error<TextAPIError>(TextAPIErrorCode::InvalidInputFormat,
"invalid version number");
if (Version < 1 || Version > 3)
return make_error<TextAPIError>(TextAPIErrorCode::InvalidInputFormat,
"unsupported version");
// Not specifying any header files should be atypical, but valid.
auto Headers = Root->getArray("headers");
if (!Headers)
return Error::success();
Error Err = parseHeaders(*Headers);
if (Err)
return Err;
return Error::success();
}
} // namespace
llvm::Error
FileListReader::loadHeaders(std::unique_ptr<MemoryBuffer> InputBuffer,
HeaderSeq &Destination, clang::FileManager *FM) {
Implementation Impl;
Impl.InputBuffer = std::move(InputBuffer);
Impl.FM = FM;
if (llvm::Error Err = Impl.parse(Impl.InputBuffer->getBuffer()))
return Err;
Destination.reserve(Destination.size() + Impl.HeaderList.size());
llvm::move(Impl.HeaderList, std::back_inserter(Destination));
return Error::success();
}
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