llvm/clang/lib/Frontend/HeaderIncludeGen.cpp

//===-- HeaderIncludeGen.cpp - Generate Header Includes -------------------===//
//
// 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/Frontend/DependencyOutputOptions.h"
#include "clang/Frontend/Utils.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/JSON.h"
#include "llvm/Support/raw_ostream.h"
usingnamespaceclang;

namespace {
class HeaderIncludesCallback : public PPCallbacks { … };

/// A callback for emitting header usage information to a file in JSON. Each
/// line in the file is a JSON object that includes the source file name and
/// the list of headers directly or indirectly included from it. For example:
///
/// {"source":"/tmp/foo.c",
///  "includes":["/usr/include/stdio.h", "/usr/include/stdlib.h"]}
///
/// To reduce the amount of data written to the file, we only record system
/// headers that are directly included from a file that isn't in the system
/// directory.
class HeaderIncludesJSONCallback : public PPCallbacks { … };
}

static void PrintHeaderInfo(raw_ostream *OutputFile, StringRef Filename,
                            bool ShowDepth, unsigned CurrentIncludeDepth,
                            bool MSStyle) { … }

void clang::AttachHeaderIncludeGen(Preprocessor &PP,
                                   const DependencyOutputOptions &DepOpts,
                                   bool ShowAllHeaders, StringRef OutputPath,
                                   bool ShowDepth, bool MSStyle) { … }

void HeaderIncludesCallback::FileChanged(SourceLocation Loc,
                                         FileChangeReason Reason,
                                         SrcMgr::CharacteristicKind NewFileType,
                                         FileID PrevFID) { … }

void HeaderIncludesCallback::FileSkipped(const FileEntryRef &SkippedFile, const
                                         Token &FilenameTok,
                                         SrcMgr::CharacteristicKind FileType) { … }

void HeaderIncludesJSONCallback::EndOfMainFile() { … }

/// Determine whether the header file should be recorded. The header file should
/// be recorded only if the header file is a system header and the current file
/// isn't a system header.
static bool shouldRecordNewFile(SrcMgr::CharacteristicKind NewFileType,
                                SourceLocation PrevLoc, SourceManager &SM) { … }

void HeaderIncludesJSONCallback::FileChanged(
    SourceLocation Loc, FileChangeReason Reason,
    SrcMgr::CharacteristicKind NewFileType, FileID PrevFID) { … }

void HeaderIncludesJSONCallback::FileSkipped(
    const FileEntryRef &SkippedFile, const Token &FilenameTok,
    SrcMgr::CharacteristicKind FileType) { … }