forked from OSchip/llvm-project
543 lines
23 KiB
C++
543 lines
23 KiB
C++
//===--- InclusionRewriter.cpp - Rewrite includes into their expansions ---===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This code rewrites include invocations into their expansions. This gives you
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// a file with all included files merged into it.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Rewrite/Frontend/Rewriters.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Frontend/PreprocessorOutputOptions.h"
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#include "clang/Lex/HeaderSearch.h"
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#include "clang/Lex/Pragma.h"
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#include "clang/Lex/Preprocessor.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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using namespace llvm;
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namespace {
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class InclusionRewriter : public PPCallbacks {
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/// Information about which #includes were actually performed,
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/// created by preprocessor callbacks.
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struct FileChange {
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const Module *Mod;
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SourceLocation From;
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FileID Id;
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SrcMgr::CharacteristicKind FileType;
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FileChange(SourceLocation From, const Module *Mod) : Mod(Mod), From(From) {
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}
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};
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Preprocessor &PP; ///< Used to find inclusion directives.
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SourceManager &SM; ///< Used to read and manage source files.
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raw_ostream &OS; ///< The destination stream for rewritten contents.
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const llvm::MemoryBuffer *PredefinesBuffer; ///< The preprocessor predefines.
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bool ShowLineMarkers; ///< Show #line markers.
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bool UseLineDirective; ///< Use of line directives or line markers.
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typedef std::map<unsigned, FileChange> FileChangeMap;
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FileChangeMap FileChanges; ///< Tracks which files were included where.
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/// Used transitively for building up the FileChanges mapping over the
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/// various \c PPCallbacks callbacks.
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FileChangeMap::iterator LastInsertedFileChange;
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public:
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InclusionRewriter(Preprocessor &PP, raw_ostream &OS, bool ShowLineMarkers);
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bool Process(FileID FileId, SrcMgr::CharacteristicKind FileType);
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void setPredefinesBuffer(const llvm::MemoryBuffer *Buf) {
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PredefinesBuffer = Buf;
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}
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private:
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void FileChanged(SourceLocation Loc, FileChangeReason Reason,
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SrcMgr::CharacteristicKind FileType,
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FileID PrevFID) override;
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void FileSkipped(const FileEntry &ParentFile, const Token &FilenameTok,
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SrcMgr::CharacteristicKind FileType) override;
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void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
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StringRef FileName, bool IsAngled,
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CharSourceRange FilenameRange, const FileEntry *File,
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StringRef SearchPath, StringRef RelativePath,
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const Module *Imported) override;
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void WriteLineInfo(const char *Filename, int Line,
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SrcMgr::CharacteristicKind FileType,
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StringRef EOL, StringRef Extra = StringRef());
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void WriteImplicitModuleImport(const Module *Mod, StringRef EOL);
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void OutputContentUpTo(const MemoryBuffer &FromFile,
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unsigned &WriteFrom, unsigned WriteTo,
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StringRef EOL, int &lines,
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bool EnsureNewline);
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void CommentOutDirective(Lexer &DirectivesLex, const Token &StartToken,
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const MemoryBuffer &FromFile, StringRef EOL,
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unsigned &NextToWrite, int &Lines);
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bool HandleHasInclude(FileID FileId, Lexer &RawLex,
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const DirectoryLookup *Lookup, Token &Tok,
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bool &FileExists);
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const FileChange *FindFileChangeLocation(SourceLocation Loc) const;
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StringRef NextIdentifierName(Lexer &RawLex, Token &RawToken);
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};
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} // end anonymous namespace
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/// Initializes an InclusionRewriter with a \p PP source and \p OS destination.
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InclusionRewriter::InclusionRewriter(Preprocessor &PP, raw_ostream &OS,
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bool ShowLineMarkers)
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: PP(PP), SM(PP.getSourceManager()), OS(OS), PredefinesBuffer(0),
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ShowLineMarkers(ShowLineMarkers),
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LastInsertedFileChange(FileChanges.end()) {
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// If we're in microsoft mode, use normal #line instead of line markers.
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UseLineDirective = PP.getLangOpts().MicrosoftExt;
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}
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/// Write appropriate line information as either #line directives or GNU line
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/// markers depending on what mode we're in, including the \p Filename and
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/// \p Line we are located at, using the specified \p EOL line separator, and
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/// any \p Extra context specifiers in GNU line directives.
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void InclusionRewriter::WriteLineInfo(const char *Filename, int Line,
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SrcMgr::CharacteristicKind FileType,
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StringRef EOL, StringRef Extra) {
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if (!ShowLineMarkers)
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return;
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if (UseLineDirective) {
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OS << "#line" << ' ' << Line << ' ' << '"';
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OS.write_escaped(Filename);
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OS << '"';
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} else {
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// Use GNU linemarkers as described here:
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// http://gcc.gnu.org/onlinedocs/cpp/Preprocessor-Output.html
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OS << '#' << ' ' << Line << ' ' << '"';
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OS.write_escaped(Filename);
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OS << '"';
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if (!Extra.empty())
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OS << Extra;
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if (FileType == SrcMgr::C_System)
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// "`3' This indicates that the following text comes from a system header
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// file, so certain warnings should be suppressed."
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OS << " 3";
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else if (FileType == SrcMgr::C_ExternCSystem)
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// as above for `3', plus "`4' This indicates that the following text
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// should be treated as being wrapped in an implicit extern "C" block."
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OS << " 3 4";
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}
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OS << EOL;
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}
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void InclusionRewriter::WriteImplicitModuleImport(const Module *Mod,
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StringRef EOL) {
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OS << "@import " << Mod->getFullModuleName() << ";"
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<< " /* clang -frewrite-includes: implicit import */" << EOL;
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}
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/// FileChanged - Whenever the preprocessor enters or exits a #include file
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/// it invokes this handler.
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void InclusionRewriter::FileChanged(SourceLocation Loc,
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FileChangeReason Reason,
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SrcMgr::CharacteristicKind NewFileType,
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FileID) {
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if (Reason != EnterFile)
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return;
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if (LastInsertedFileChange == FileChanges.end())
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// we didn't reach this file (eg: the main file) via an inclusion directive
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return;
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LastInsertedFileChange->second.Id = FullSourceLoc(Loc, SM).getFileID();
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LastInsertedFileChange->second.FileType = NewFileType;
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LastInsertedFileChange = FileChanges.end();
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}
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/// Called whenever an inclusion is skipped due to canonical header protection
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/// macros.
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void InclusionRewriter::FileSkipped(const FileEntry &/*ParentFile*/,
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const Token &/*FilenameTok*/,
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SrcMgr::CharacteristicKind /*FileType*/) {
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assert(LastInsertedFileChange != FileChanges.end() && "A file, that wasn't "
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"found via an inclusion directive, was skipped");
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FileChanges.erase(LastInsertedFileChange);
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LastInsertedFileChange = FileChanges.end();
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}
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/// This should be called whenever the preprocessor encounters include
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/// directives. It does not say whether the file has been included, but it
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/// provides more information about the directive (hash location instead
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/// of location inside the included file). It is assumed that the matching
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/// FileChanged() or FileSkipped() is called after this.
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void InclusionRewriter::InclusionDirective(SourceLocation HashLoc,
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const Token &/*IncludeTok*/,
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StringRef /*FileName*/,
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bool /*IsAngled*/,
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CharSourceRange /*FilenameRange*/,
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const FileEntry * /*File*/,
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StringRef /*SearchPath*/,
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StringRef /*RelativePath*/,
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const Module *Imported) {
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assert(LastInsertedFileChange == FileChanges.end() && "Another inclusion "
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"directive was found before the previous one was processed");
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std::pair<FileChangeMap::iterator, bool> p = FileChanges.insert(
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std::make_pair(HashLoc.getRawEncoding(), FileChange(HashLoc, Imported)));
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assert(p.second && "Unexpected revisitation of the same include directive");
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if (!Imported)
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LastInsertedFileChange = p.first;
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}
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/// Simple lookup for a SourceLocation (specifically one denoting the hash in
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/// an inclusion directive) in the map of inclusion information, FileChanges.
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const InclusionRewriter::FileChange *
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InclusionRewriter::FindFileChangeLocation(SourceLocation Loc) const {
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FileChangeMap::const_iterator I = FileChanges.find(Loc.getRawEncoding());
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if (I != FileChanges.end())
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return &I->second;
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return NULL;
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}
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/// Detect the likely line ending style of \p FromFile by examining the first
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/// newline found within it.
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static StringRef DetectEOL(const MemoryBuffer &FromFile) {
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// detect what line endings the file uses, so that added content does not mix
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// the style
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const char *Pos = strchr(FromFile.getBufferStart(), '\n');
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if (Pos == NULL)
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return "\n";
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if (Pos + 1 < FromFile.getBufferEnd() && Pos[1] == '\r')
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return "\n\r";
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if (Pos - 1 >= FromFile.getBufferStart() && Pos[-1] == '\r')
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return "\r\n";
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return "\n";
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}
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/// Writes out bytes from \p FromFile, starting at \p NextToWrite and ending at
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/// \p WriteTo - 1.
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void InclusionRewriter::OutputContentUpTo(const MemoryBuffer &FromFile,
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unsigned &WriteFrom, unsigned WriteTo,
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StringRef EOL, int &Line,
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bool EnsureNewline) {
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if (WriteTo <= WriteFrom)
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return;
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if (&FromFile == PredefinesBuffer) {
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// Ignore the #defines of the predefines buffer.
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WriteFrom = WriteTo;
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return;
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}
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OS.write(FromFile.getBufferStart() + WriteFrom, WriteTo - WriteFrom);
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// count lines manually, it's faster than getPresumedLoc()
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Line += std::count(FromFile.getBufferStart() + WriteFrom,
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FromFile.getBufferStart() + WriteTo, '\n');
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if (EnsureNewline) {
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char LastChar = FromFile.getBufferStart()[WriteTo - 1];
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if (LastChar != '\n' && LastChar != '\r')
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OS << EOL;
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}
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WriteFrom = WriteTo;
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}
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/// Print characters from \p FromFile starting at \p NextToWrite up until the
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/// inclusion directive at \p StartToken, then print out the inclusion
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/// inclusion directive disabled by a #if directive, updating \p NextToWrite
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/// and \p Line to track the number of source lines visited and the progress
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/// through the \p FromFile buffer.
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void InclusionRewriter::CommentOutDirective(Lexer &DirectiveLex,
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const Token &StartToken,
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const MemoryBuffer &FromFile,
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StringRef EOL,
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unsigned &NextToWrite, int &Line) {
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OutputContentUpTo(FromFile, NextToWrite,
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SM.getFileOffset(StartToken.getLocation()), EOL, Line, false);
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Token DirectiveToken;
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do {
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DirectiveLex.LexFromRawLexer(DirectiveToken);
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} while (!DirectiveToken.is(tok::eod) && DirectiveToken.isNot(tok::eof));
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OS << "#if 0 /* expanded by -frewrite-includes */" << EOL;
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OutputContentUpTo(FromFile, NextToWrite,
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SM.getFileOffset(DirectiveToken.getLocation()) + DirectiveToken.getLength(),
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EOL, Line, true);
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OS << "#endif /* expanded by -frewrite-includes */" << EOL;
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}
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/// Find the next identifier in the pragma directive specified by \p RawToken.
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StringRef InclusionRewriter::NextIdentifierName(Lexer &RawLex,
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Token &RawToken) {
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RawLex.LexFromRawLexer(RawToken);
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if (RawToken.is(tok::raw_identifier))
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PP.LookUpIdentifierInfo(RawToken);
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if (RawToken.is(tok::identifier))
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return RawToken.getIdentifierInfo()->getName();
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return StringRef();
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}
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// Expand __has_include and __has_include_next if possible. If there's no
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// definitive answer return false.
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bool InclusionRewriter::HandleHasInclude(
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FileID FileId, Lexer &RawLex, const DirectoryLookup *Lookup, Token &Tok,
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bool &FileExists) {
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// Lex the opening paren.
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RawLex.LexFromRawLexer(Tok);
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if (Tok.isNot(tok::l_paren))
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return false;
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RawLex.LexFromRawLexer(Tok);
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SmallString<128> FilenameBuffer;
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StringRef Filename;
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// Since the raw lexer doesn't give us angle_literals we have to parse them
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// ourselves.
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// FIXME: What to do if the file name is a macro?
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if (Tok.is(tok::less)) {
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RawLex.LexFromRawLexer(Tok);
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FilenameBuffer += '<';
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do {
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if (Tok.is(tok::eod)) // Sanity check.
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return false;
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if (Tok.is(tok::raw_identifier))
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PP.LookUpIdentifierInfo(Tok);
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// Get the string piece.
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SmallVector<char, 128> TmpBuffer;
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bool Invalid = false;
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StringRef TmpName = PP.getSpelling(Tok, TmpBuffer, &Invalid);
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if (Invalid)
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return false;
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FilenameBuffer += TmpName;
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RawLex.LexFromRawLexer(Tok);
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} while (Tok.isNot(tok::greater));
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FilenameBuffer += '>';
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Filename = FilenameBuffer;
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} else {
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if (Tok.isNot(tok::string_literal))
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return false;
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bool Invalid = false;
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Filename = PP.getSpelling(Tok, FilenameBuffer, &Invalid);
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if (Invalid)
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return false;
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}
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// Lex the closing paren.
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RawLex.LexFromRawLexer(Tok);
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if (Tok.isNot(tok::r_paren))
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return false;
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// Now ask HeaderInfo if it knows about the header.
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// FIXME: Subframeworks aren't handled here. Do we care?
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bool isAngled = PP.GetIncludeFilenameSpelling(Tok.getLocation(), Filename);
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const DirectoryLookup *CurDir;
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const FileEntry *File = PP.getHeaderSearchInfo().LookupFile(
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Filename, SourceLocation(), isAngled, 0, CurDir,
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PP.getSourceManager().getFileEntryForID(FileId), 0, 0, 0, false);
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FileExists = File != 0;
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return true;
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}
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/// Use a raw lexer to analyze \p FileId, incrementally copying parts of it
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/// and including content of included files recursively.
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bool InclusionRewriter::Process(FileID FileId,
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SrcMgr::CharacteristicKind FileType)
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{
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bool Invalid;
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const MemoryBuffer &FromFile = *SM.getBuffer(FileId, &Invalid);
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if (Invalid) // invalid inclusion
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return false;
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const char *FileName = FromFile.getBufferIdentifier();
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Lexer RawLex(FileId, &FromFile, PP.getSourceManager(), PP.getLangOpts());
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RawLex.SetCommentRetentionState(false);
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StringRef EOL = DetectEOL(FromFile);
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// Per the GNU docs: "1" indicates the start of a new file.
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WriteLineInfo(FileName, 1, FileType, EOL, " 1");
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if (SM.getFileIDSize(FileId) == 0)
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return false;
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// The next byte to be copied from the source file, which may be non-zero if
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// the lexer handled a BOM.
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unsigned NextToWrite = SM.getFileOffset(RawLex.getSourceLocation());
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assert(SM.getLineNumber(FileId, NextToWrite) == 1);
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int Line = 1; // The current input file line number.
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Token RawToken;
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RawLex.LexFromRawLexer(RawToken);
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// TODO: Consider adding a switch that strips possibly unimportant content,
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// such as comments, to reduce the size of repro files.
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while (RawToken.isNot(tok::eof)) {
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if (RawToken.is(tok::hash) && RawToken.isAtStartOfLine()) {
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RawLex.setParsingPreprocessorDirective(true);
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Token HashToken = RawToken;
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RawLex.LexFromRawLexer(RawToken);
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if (RawToken.is(tok::raw_identifier))
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PP.LookUpIdentifierInfo(RawToken);
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if (RawToken.getIdentifierInfo() != NULL) {
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switch (RawToken.getIdentifierInfo()->getPPKeywordID()) {
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case tok::pp_include:
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case tok::pp_include_next:
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case tok::pp_import: {
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CommentOutDirective(RawLex, HashToken, FromFile, EOL, NextToWrite,
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Line);
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StringRef LineInfoExtra;
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if (const FileChange *Change = FindFileChangeLocation(
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HashToken.getLocation())) {
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if (Change->Mod) {
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WriteImplicitModuleImport(Change->Mod, EOL);
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// else now include and recursively process the file
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} else if (Process(Change->Id, Change->FileType)) {
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// and set lineinfo back to this file, if the nested one was
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// actually included
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// `2' indicates returning to a file (after having included
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// another file.
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LineInfoExtra = " 2";
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}
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}
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// fix up lineinfo (since commented out directive changed line
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// numbers) for inclusions that were skipped due to header guards
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WriteLineInfo(FileName, Line, FileType, EOL, LineInfoExtra);
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break;
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}
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case tok::pp_pragma: {
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StringRef Identifier = NextIdentifierName(RawLex, RawToken);
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if (Identifier == "clang" || Identifier == "GCC") {
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if (NextIdentifierName(RawLex, RawToken) == "system_header") {
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// keep the directive in, commented out
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CommentOutDirective(RawLex, HashToken, FromFile, EOL,
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NextToWrite, Line);
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// update our own type
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FileType = SM.getFileCharacteristic(RawToken.getLocation());
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WriteLineInfo(FileName, Line, FileType, EOL);
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}
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} else if (Identifier == "once") {
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// keep the directive in, commented out
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CommentOutDirective(RawLex, HashToken, FromFile, EOL,
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NextToWrite, Line);
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WriteLineInfo(FileName, Line, FileType, EOL);
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}
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break;
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}
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case tok::pp_if:
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case tok::pp_elif: {
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bool elif = (RawToken.getIdentifierInfo()->getPPKeywordID() ==
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tok::pp_elif);
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// Rewrite special builtin macros to avoid pulling in host details.
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do {
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// Walk over the directive.
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RawLex.LexFromRawLexer(RawToken);
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if (RawToken.is(tok::raw_identifier))
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PP.LookUpIdentifierInfo(RawToken);
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if (RawToken.is(tok::identifier)) {
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bool HasFile;
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SourceLocation Loc = RawToken.getLocation();
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// Rewrite __has_include(x)
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if (RawToken.getIdentifierInfo()->isStr("__has_include")) {
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if (!HandleHasInclude(FileId, RawLex, 0, RawToken, HasFile))
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continue;
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// Rewrite __has_include_next(x)
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} else if (RawToken.getIdentifierInfo()->isStr(
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"__has_include_next")) {
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const DirectoryLookup *Lookup = PP.GetCurDirLookup();
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if (Lookup)
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++Lookup;
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if (!HandleHasInclude(FileId, RawLex, Lookup, RawToken,
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HasFile))
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continue;
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} else {
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continue;
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}
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// Replace the macro with (0) or (1), followed by the commented
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// out macro for reference.
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OutputContentUpTo(FromFile, NextToWrite, SM.getFileOffset(Loc),
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EOL, Line, false);
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OS << '(' << (int) HasFile << ")/*";
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OutputContentUpTo(FromFile, NextToWrite,
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SM.getFileOffset(RawToken.getLocation()) +
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RawToken.getLength(),
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EOL, Line, false);
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OS << "*/";
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}
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} while (RawToken.isNot(tok::eod));
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if (elif) {
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OutputContentUpTo(FromFile, NextToWrite,
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SM.getFileOffset(RawToken.getLocation()) +
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RawToken.getLength(),
|
|
EOL, Line, /*EnsureNewLine*/ true);
|
|
WriteLineInfo(FileName, Line, FileType, EOL);
|
|
}
|
|
break;
|
|
}
|
|
case tok::pp_endif:
|
|
case tok::pp_else: {
|
|
// We surround every #include by #if 0 to comment it out, but that
|
|
// changes line numbers. These are fixed up right after that, but
|
|
// the whole #include could be inside a preprocessor conditional
|
|
// that is not processed. So it is necessary to fix the line
|
|
// numbers one the next line after each #else/#endif as well.
|
|
RawLex.SetKeepWhitespaceMode(true);
|
|
do {
|
|
RawLex.LexFromRawLexer(RawToken);
|
|
} while (RawToken.isNot(tok::eod) && RawToken.isNot(tok::eof));
|
|
OutputContentUpTo(
|
|
FromFile, NextToWrite,
|
|
SM.getFileOffset(RawToken.getLocation()) + RawToken.getLength(),
|
|
EOL, Line, /*EnsureNewLine*/ true);
|
|
WriteLineInfo(FileName, Line, FileType, EOL);
|
|
RawLex.SetKeepWhitespaceMode(false);
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
RawLex.setParsingPreprocessorDirective(false);
|
|
}
|
|
RawLex.LexFromRawLexer(RawToken);
|
|
}
|
|
OutputContentUpTo(FromFile, NextToWrite,
|
|
SM.getFileOffset(SM.getLocForEndOfFile(FileId)), EOL, Line,
|
|
/*EnsureNewline*/true);
|
|
return true;
|
|
}
|
|
|
|
/// InclusionRewriterInInput - Implement -frewrite-includes mode.
|
|
void clang::RewriteIncludesInInput(Preprocessor &PP, raw_ostream *OS,
|
|
const PreprocessorOutputOptions &Opts) {
|
|
SourceManager &SM = PP.getSourceManager();
|
|
InclusionRewriter *Rewrite = new InclusionRewriter(PP, *OS,
|
|
Opts.ShowLineMarkers);
|
|
PP.addPPCallbacks(Rewrite);
|
|
// Ignore all pragmas, otherwise there will be warnings about unknown pragmas
|
|
// (because there's nothing to handle them).
|
|
PP.AddPragmaHandler(new EmptyPragmaHandler());
|
|
// Ignore also all pragma in all namespaces created
|
|
// in Preprocessor::RegisterBuiltinPragmas().
|
|
PP.AddPragmaHandler("GCC", new EmptyPragmaHandler());
|
|
PP.AddPragmaHandler("clang", new EmptyPragmaHandler());
|
|
|
|
// First let the preprocessor process the entire file and call callbacks.
|
|
// Callbacks will record which #include's were actually performed.
|
|
PP.EnterMainSourceFile();
|
|
Token Tok;
|
|
// Only preprocessor directives matter here, so disable macro expansion
|
|
// everywhere else as an optimization.
|
|
// TODO: It would be even faster if the preprocessor could be switched
|
|
// to a mode where it would parse only preprocessor directives and comments,
|
|
// nothing else matters for parsing or processing.
|
|
PP.SetMacroExpansionOnlyInDirectives();
|
|
do {
|
|
PP.Lex(Tok);
|
|
} while (Tok.isNot(tok::eof));
|
|
Rewrite->setPredefinesBuffer(SM.getBuffer(PP.getPredefinesFileID()));
|
|
Rewrite->Process(PP.getPredefinesFileID(), SrcMgr::C_User);
|
|
Rewrite->Process(SM.getMainFileID(), SrcMgr::C_User);
|
|
OS->flush();
|
|
}
|