//===--- HeaderIncludes.cpp - Generate Header Includes --------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// #include "clang/Frontend/Utils.h" #include "clang/Basic/SourceManager.h" #include "clang/Lex/Preprocessor.h" using namespace clang; namespace { class HeaderIncludesCallback : public PPCallbacks { SourceManager &SM; unsigned CurrentIncludeDepth; bool ShowAllHeaders; bool HasProcessedPredefines; public: HeaderIncludesCallback(const Preprocessor *PP, bool ShowAllHeaders_) : SM(PP->getSourceManager()), CurrentIncludeDepth(0), ShowAllHeaders(ShowAllHeaders_), HasProcessedPredefines(false) {} virtual void FileChanged(SourceLocation Loc, FileChangeReason Reason, SrcMgr::CharacteristicKind FileType); }; } void clang::AttachHeaderIncludeGen(Preprocessor &PP, bool ShowAllHeaders, llvm::StringRef OutputPath) { PP.addPPCallbacks(new HeaderIncludesCallback(&PP, ShowAllHeaders)); } void HeaderIncludesCallback::FileChanged(SourceLocation Loc, FileChangeReason Reason, SrcMgr::CharacteristicKind NewFileType) { // Unless we are exiting a #include, make sure to skip ahead to the line the // #include directive was at. PresumedLoc UserLoc = SM.getPresumedLoc(Loc); if (UserLoc.isInvalid()) return; // Adjust the current include depth. if (Reason == PPCallbacks::EnterFile) { ++CurrentIncludeDepth; } else { if (CurrentIncludeDepth) --CurrentIncludeDepth; // We track when we are done with the predefines by watching for the first // place where we drop back to a nesting depth of 0. if (CurrentIncludeDepth == 0 && !HasProcessedPredefines) HasProcessedPredefines = true; } // Show the header if we are (a) past the predefines, or (b) showing all // headers and in the predefines at a depth past the initial file and command // line buffers. bool ShowHeader = (HasProcessedPredefines || (ShowAllHeaders && CurrentIncludeDepth > 2)); // Dump the header include information we are past the predefines buffer or // are showing all headers. if (ShowHeader && Reason == PPCallbacks::EnterFile) { // Write to a temporary string to avoid unnecessary flushing on errs(). llvm::SmallString<512> Filename(UserLoc.getFilename()); Lexer::Stringify(Filename); llvm::SmallString<256> Msg; for (unsigned i = 0; i != CurrentIncludeDepth; ++i) Msg += '.'; Msg += ' '; Msg += Filename; Msg += '\n'; llvm::errs() << Msg; } }