587 lines
23 KiB
C++
587 lines
23 KiB
C++
//===--- PPLexerChange.cpp - Handle changing lexers in the preprocessor ---===//
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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 file implements pieces of the Preprocessor interface that manage the
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// current lexer stack.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Lex/HeaderSearch.h"
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#include "clang/Lex/LexDiagnostic.h"
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#include "clang/Lex/MacroInfo.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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using namespace clang;
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PPCallbacks::~PPCallbacks() {}
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//===----------------------------------------------------------------------===//
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// Miscellaneous Methods.
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//===----------------------------------------------------------------------===//
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/// isInPrimaryFile - Return true if we're in the top-level file, not in a
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/// \#include. This looks through macro expansions and active _Pragma lexers.
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bool Preprocessor::isInPrimaryFile() const {
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if (IsFileLexer())
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return IncludeMacroStack.empty();
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// If there are any stacked lexers, we're in a #include.
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assert(IsFileLexer(IncludeMacroStack[0]) &&
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"Top level include stack isn't our primary lexer?");
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for (unsigned i = 1, e = IncludeMacroStack.size(); i != e; ++i)
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if (IsFileLexer(IncludeMacroStack[i]))
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return false;
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return true;
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}
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/// getCurrentLexer - Return the current file lexer being lexed from. Note
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/// that this ignores any potentially active macro expansions and _Pragma
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/// expansions going on at the time.
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PreprocessorLexer *Preprocessor::getCurrentFileLexer() const {
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if (IsFileLexer())
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return CurPPLexer;
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// Look for a stacked lexer.
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for (unsigned i = IncludeMacroStack.size(); i != 0; --i) {
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const IncludeStackInfo& ISI = IncludeMacroStack[i-1];
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if (IsFileLexer(ISI))
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return ISI.ThePPLexer;
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}
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return 0;
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}
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//===----------------------------------------------------------------------===//
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// Methods for Entering and Callbacks for leaving various contexts
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//===----------------------------------------------------------------------===//
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/// EnterSourceFile - Add a source file to the top of the include stack and
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/// start lexing tokens from it instead of the current buffer.
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void Preprocessor::EnterSourceFile(FileID FID, const DirectoryLookup *CurDir,
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SourceLocation Loc) {
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assert(!CurTokenLexer && "Cannot #include a file inside a macro!");
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++NumEnteredSourceFiles;
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if (MaxIncludeStackDepth < IncludeMacroStack.size())
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MaxIncludeStackDepth = IncludeMacroStack.size();
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if (PTH) {
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if (PTHLexer *PL = PTH->CreateLexer(FID)) {
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EnterSourceFileWithPTH(PL, CurDir);
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return;
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}
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}
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// Get the MemoryBuffer for this FID, if it fails, we fail.
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bool Invalid = false;
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const llvm::MemoryBuffer *InputFile =
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getSourceManager().getBuffer(FID, Loc, &Invalid);
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if (Invalid) {
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SourceLocation FileStart = SourceMgr.getLocForStartOfFile(FID);
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Diag(Loc, diag::err_pp_error_opening_file)
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<< std::string(SourceMgr.getBufferName(FileStart)) << "";
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return;
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}
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if (isCodeCompletionEnabled() &&
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SourceMgr.getFileEntryForID(FID) == CodeCompletionFile) {
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CodeCompletionFileLoc = SourceMgr.getLocForStartOfFile(FID);
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CodeCompletionLoc =
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CodeCompletionFileLoc.getLocWithOffset(CodeCompletionOffset);
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}
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EnterSourceFileWithLexer(new Lexer(FID, InputFile, *this), CurDir);
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return;
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}
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/// EnterSourceFileWithLexer - Add a source file to the top of the include stack
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/// and start lexing tokens from it instead of the current buffer.
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void Preprocessor::EnterSourceFileWithLexer(Lexer *TheLexer,
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const DirectoryLookup *CurDir) {
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// Add the current lexer to the include stack.
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if (CurPPLexer || CurTokenLexer)
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PushIncludeMacroStack();
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CurLexer.reset(TheLexer);
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CurPPLexer = TheLexer;
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CurDirLookup = CurDir;
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if (CurLexerKind != CLK_LexAfterModuleImport)
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CurLexerKind = CLK_Lexer;
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// Notify the client, if desired, that we are in a new source file.
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if (Callbacks && !CurLexer->Is_PragmaLexer) {
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SrcMgr::CharacteristicKind FileType =
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SourceMgr.getFileCharacteristic(CurLexer->getFileLoc());
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Callbacks->FileChanged(CurLexer->getFileLoc(),
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PPCallbacks::EnterFile, FileType);
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}
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}
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/// EnterSourceFileWithPTH - Add a source file to the top of the include stack
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/// and start getting tokens from it using the PTH cache.
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void Preprocessor::EnterSourceFileWithPTH(PTHLexer *PL,
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const DirectoryLookup *CurDir) {
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if (CurPPLexer || CurTokenLexer)
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PushIncludeMacroStack();
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CurDirLookup = CurDir;
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CurPTHLexer.reset(PL);
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CurPPLexer = CurPTHLexer.get();
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if (CurLexerKind != CLK_LexAfterModuleImport)
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CurLexerKind = CLK_PTHLexer;
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// Notify the client, if desired, that we are in a new source file.
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if (Callbacks) {
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FileID FID = CurPPLexer->getFileID();
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SourceLocation EnterLoc = SourceMgr.getLocForStartOfFile(FID);
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SrcMgr::CharacteristicKind FileType =
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SourceMgr.getFileCharacteristic(EnterLoc);
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Callbacks->FileChanged(EnterLoc, PPCallbacks::EnterFile, FileType);
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}
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}
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/// EnterMacro - Add a Macro to the top of the include stack and start lexing
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/// tokens from it instead of the current buffer.
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void Preprocessor::EnterMacro(Token &Tok, SourceLocation ILEnd,
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MacroInfo *Macro, MacroArgs *Args) {
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TokenLexer *TokLexer;
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if (NumCachedTokenLexers == 0) {
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TokLexer = new TokenLexer(Tok, ILEnd, Macro, Args, *this);
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} else {
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TokLexer = TokenLexerCache[--NumCachedTokenLexers];
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TokLexer->Init(Tok, ILEnd, Macro, Args);
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}
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PushIncludeMacroStack();
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CurDirLookup = 0;
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CurTokenLexer.reset(TokLexer);
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if (CurLexerKind != CLK_LexAfterModuleImport)
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CurLexerKind = CLK_TokenLexer;
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}
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/// EnterTokenStream - Add a "macro" context to the top of the include stack,
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/// which will cause the lexer to start returning the specified tokens.
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///
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/// If DisableMacroExpansion is true, tokens lexed from the token stream will
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/// not be subject to further macro expansion. Otherwise, these tokens will
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/// be re-macro-expanded when/if expansion is enabled.
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///
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/// If OwnsTokens is false, this method assumes that the specified stream of
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/// tokens has a permanent owner somewhere, so they do not need to be copied.
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/// If it is true, it assumes the array of tokens is allocated with new[] and
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/// must be freed.
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///
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void Preprocessor::EnterTokenStream(const Token *Toks, unsigned NumToks,
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bool DisableMacroExpansion,
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bool OwnsTokens) {
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// Create a macro expander to expand from the specified token stream.
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TokenLexer *TokLexer;
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if (NumCachedTokenLexers == 0) {
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TokLexer = new TokenLexer(Toks, NumToks, DisableMacroExpansion,
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OwnsTokens, *this);
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} else {
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TokLexer = TokenLexerCache[--NumCachedTokenLexers];
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TokLexer->Init(Toks, NumToks, DisableMacroExpansion, OwnsTokens);
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}
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// Save our current state.
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PushIncludeMacroStack();
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CurDirLookup = 0;
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CurTokenLexer.reset(TokLexer);
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if (CurLexerKind != CLK_LexAfterModuleImport)
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CurLexerKind = CLK_TokenLexer;
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}
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/// \brief Compute the relative path that names the given file relative to
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/// the given directory.
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static void computeRelativePath(FileManager &FM, const DirectoryEntry *Dir,
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const FileEntry *File,
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SmallString<128> &Result) {
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Result.clear();
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StringRef FilePath = File->getDir()->getName();
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StringRef Path = FilePath;
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while (!Path.empty()) {
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if (const DirectoryEntry *CurDir = FM.getDirectory(Path)) {
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if (CurDir == Dir) {
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Result = FilePath.substr(Path.size());
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llvm::sys::path::append(Result,
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llvm::sys::path::filename(File->getName()));
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return;
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}
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}
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Path = llvm::sys::path::parent_path(Path);
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}
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Result = File->getName();
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}
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void Preprocessor::PropagateLineStartLeadingSpaceInfo(Token &Result) {
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if (CurTokenLexer) {
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CurTokenLexer->PropagateLineStartLeadingSpaceInfo(Result);
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return;
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}
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if (CurLexer) {
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CurLexer->PropagateLineStartLeadingSpaceInfo(Result);
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return;
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}
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// FIXME: Handle other kinds of lexers? It generally shouldn't matter,
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// but it might if they're empty?
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}
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/// HandleEndOfFile - This callback is invoked when the lexer hits the end of
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/// the current file. This either returns the EOF token or pops a level off
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/// the include stack and keeps going.
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bool Preprocessor::HandleEndOfFile(Token &Result, bool isEndOfMacro) {
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assert(!CurTokenLexer &&
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"Ending a file when currently in a macro!");
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// See if this file had a controlling macro.
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if (CurPPLexer) { // Not ending a macro, ignore it.
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if (const IdentifierInfo *ControllingMacro =
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CurPPLexer->MIOpt.GetControllingMacroAtEndOfFile()) {
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// Okay, this has a controlling macro, remember in HeaderFileInfo.
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if (const FileEntry *FE =
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SourceMgr.getFileEntryForID(CurPPLexer->getFileID())) {
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HeaderInfo.SetFileControllingMacro(FE, ControllingMacro);
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if (const IdentifierInfo *DefinedMacro =
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CurPPLexer->MIOpt.GetDefinedMacro()) {
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if (!ControllingMacro->hasMacroDefinition() &&
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DefinedMacro != ControllingMacro &&
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HeaderInfo.FirstTimeLexingFile(FE)) {
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// If the edit distance between the two macros is more than 50%,
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// DefinedMacro may not be header guard, or can be header guard of
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// another header file. Therefore, it maybe defining something
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// completely different. This can be observed in the wild when
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// handling feature macros or header guards in different files.
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const StringRef ControllingMacroName = ControllingMacro->getName();
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const StringRef DefinedMacroName = DefinedMacro->getName();
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const size_t MaxHalfLength = std::max(ControllingMacroName.size(),
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DefinedMacroName.size()) / 2;
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const unsigned ED = ControllingMacroName.edit_distance(
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DefinedMacroName, true, MaxHalfLength);
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if (ED <= MaxHalfLength) {
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// Emit a warning for a bad header guard.
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Diag(CurPPLexer->MIOpt.GetMacroLocation(),
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diag::warn_header_guard)
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<< CurPPLexer->MIOpt.GetMacroLocation() << ControllingMacro;
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Diag(CurPPLexer->MIOpt.GetDefinedLocation(),
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diag::note_header_guard)
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<< CurPPLexer->MIOpt.GetDefinedLocation() << DefinedMacro
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<< ControllingMacro
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<< FixItHint::CreateReplacement(
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CurPPLexer->MIOpt.GetDefinedLocation(),
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ControllingMacro->getName());
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}
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}
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}
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}
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}
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}
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// Complain about reaching a true EOF within arc_cf_code_audited.
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// We don't want to complain about reaching the end of a macro
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// instantiation or a _Pragma.
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if (PragmaARCCFCodeAuditedLoc.isValid() &&
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!isEndOfMacro && !(CurLexer && CurLexer->Is_PragmaLexer)) {
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Diag(PragmaARCCFCodeAuditedLoc, diag::err_pp_eof_in_arc_cf_code_audited);
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// Recover by leaving immediately.
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PragmaARCCFCodeAuditedLoc = SourceLocation();
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}
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// If this is a #include'd file, pop it off the include stack and continue
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// lexing the #includer file.
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if (!IncludeMacroStack.empty()) {
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// If we lexed the code-completion file, act as if we reached EOF.
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if (isCodeCompletionEnabled() && CurPPLexer &&
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SourceMgr.getLocForStartOfFile(CurPPLexer->getFileID()) ==
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CodeCompletionFileLoc) {
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if (CurLexer) {
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Result.startToken();
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CurLexer->FormTokenWithChars(Result, CurLexer->BufferEnd, tok::eof);
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CurLexer.reset();
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} else {
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assert(CurPTHLexer && "Got EOF but no current lexer set!");
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CurPTHLexer->getEOF(Result);
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CurPTHLexer.reset();
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}
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CurPPLexer = 0;
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return true;
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}
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if (!isEndOfMacro && CurPPLexer &&
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SourceMgr.getIncludeLoc(CurPPLexer->getFileID()).isValid()) {
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// Notify SourceManager to record the number of FileIDs that were created
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// during lexing of the #include'd file.
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unsigned NumFIDs =
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SourceMgr.local_sloc_entry_size() -
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CurPPLexer->getInitialNumSLocEntries() + 1/*#include'd file*/;
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SourceMgr.setNumCreatedFIDsForFileID(CurPPLexer->getFileID(), NumFIDs);
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}
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FileID ExitedFID;
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if (Callbacks && !isEndOfMacro && CurPPLexer)
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ExitedFID = CurPPLexer->getFileID();
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// We're done with the #included file.
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RemoveTopOfLexerStack();
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// Propagate info about start-of-line/leading white-space/etc.
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PropagateLineStartLeadingSpaceInfo(Result);
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// Notify the client, if desired, that we are in a new source file.
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if (Callbacks && !isEndOfMacro && CurPPLexer) {
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SrcMgr::CharacteristicKind FileType =
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SourceMgr.getFileCharacteristic(CurPPLexer->getSourceLocation());
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Callbacks->FileChanged(CurPPLexer->getSourceLocation(),
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PPCallbacks::ExitFile, FileType, ExitedFID);
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}
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// Client should lex another token.
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return false;
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}
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// If the file ends with a newline, form the EOF token on the newline itself,
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// rather than "on the line following it", which doesn't exist. This makes
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// diagnostics relating to the end of file include the last file that the user
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// actually typed, which is goodness.
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if (CurLexer) {
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const char *EndPos = CurLexer->BufferEnd;
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if (EndPos != CurLexer->BufferStart &&
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(EndPos[-1] == '\n' || EndPos[-1] == '\r')) {
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--EndPos;
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// Handle \n\r and \r\n:
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if (EndPos != CurLexer->BufferStart &&
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(EndPos[-1] == '\n' || EndPos[-1] == '\r') &&
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EndPos[-1] != EndPos[0])
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--EndPos;
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}
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Result.startToken();
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CurLexer->BufferPtr = EndPos;
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CurLexer->FormTokenWithChars(Result, EndPos, tok::eof);
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if (isCodeCompletionEnabled()) {
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// Inserting the code-completion point increases the source buffer by 1,
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// but the main FileID was created before inserting the point.
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// Compensate by reducing the EOF location by 1, otherwise the location
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// will point to the next FileID.
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// FIXME: This is hacky, the code-completion point should probably be
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// inserted before the main FileID is created.
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if (CurLexer->getFileLoc() == CodeCompletionFileLoc)
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Result.setLocation(Result.getLocation().getLocWithOffset(-1));
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}
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if (!isIncrementalProcessingEnabled())
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// We're done with lexing.
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CurLexer.reset();
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} else {
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assert(CurPTHLexer && "Got EOF but no current lexer set!");
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CurPTHLexer->getEOF(Result);
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CurPTHLexer.reset();
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}
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if (!isIncrementalProcessingEnabled())
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CurPPLexer = 0;
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// This is the end of the top-level file. 'WarnUnusedMacroLocs' has collected
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// all macro locations that we need to warn because they are not used.
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for (WarnUnusedMacroLocsTy::iterator
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I=WarnUnusedMacroLocs.begin(), E=WarnUnusedMacroLocs.end(); I!=E; ++I)
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Diag(*I, diag::pp_macro_not_used);
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// If we are building a module that has an umbrella header, make sure that
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// each of the headers within the directory covered by the umbrella header
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// was actually included by the umbrella header.
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if (Module *Mod = getCurrentModule()) {
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if (Mod->getUmbrellaHeader()) {
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SourceLocation StartLoc
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= SourceMgr.getLocForStartOfFile(SourceMgr.getMainFileID());
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if (getDiagnostics().getDiagnosticLevel(
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diag::warn_uncovered_module_header,
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StartLoc) != DiagnosticsEngine::Ignored) {
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ModuleMap &ModMap = getHeaderSearchInfo().getModuleMap();
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typedef llvm::sys::fs::recursive_directory_iterator
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recursive_directory_iterator;
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const DirectoryEntry *Dir = Mod->getUmbrellaDir();
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llvm::error_code EC;
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for (recursive_directory_iterator Entry(Dir->getName(), EC), End;
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Entry != End && !EC; Entry.increment(EC)) {
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using llvm::StringSwitch;
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// Check whether this entry has an extension typically associated with
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// headers.
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if (!StringSwitch<bool>(llvm::sys::path::extension(Entry->path()))
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.Cases(".h", ".H", ".hh", ".hpp", true)
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.Default(false))
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continue;
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if (const FileEntry *Header = getFileManager().getFile(Entry->path()))
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if (!getSourceManager().hasFileInfo(Header)) {
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if (!ModMap.isHeaderInUnavailableModule(Header)) {
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// Find the relative path that would access this header.
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SmallString<128> RelativePath;
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computeRelativePath(FileMgr, Dir, Header, RelativePath);
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Diag(StartLoc, diag::warn_uncovered_module_header)
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<< Mod->getFullModuleName() << RelativePath;
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}
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}
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}
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}
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}
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// Check whether there are any headers that were included, but not
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// mentioned at all in the module map. Such headers
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SourceLocation StartLoc
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= SourceMgr.getLocForStartOfFile(SourceMgr.getMainFileID());
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if (getDiagnostics().getDiagnosticLevel(diag::warn_forgotten_module_header,
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StartLoc)
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!= DiagnosticsEngine::Ignored) {
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ModuleMap &ModMap = getHeaderSearchInfo().getModuleMap();
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for (unsigned I = 0, N = SourceMgr.local_sloc_entry_size(); I != N; ++I) {
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// We only care about file entries.
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const SrcMgr::SLocEntry &Entry = SourceMgr.getLocalSLocEntry(I);
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if (!Entry.isFile())
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continue;
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// Dig out the actual file.
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const FileEntry *File = Entry.getFile().getContentCache()->OrigEntry;
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if (!File)
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continue;
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|
|
|
// If it's not part of a module and not unknown, complain.
|
|
if (!ModMap.findModuleForHeader(File) &&
|
|
!ModMap.isHeaderInUnavailableModule(File)) {
|
|
Diag(StartLoc, diag::warn_forgotten_module_header)
|
|
<< File->getName() << Mod->getFullModuleName();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/// HandleEndOfTokenLexer - This callback is invoked when the current TokenLexer
|
|
/// hits the end of its token stream.
|
|
bool Preprocessor::HandleEndOfTokenLexer(Token &Result) {
|
|
assert(CurTokenLexer && !CurPPLexer &&
|
|
"Ending a macro when currently in a #include file!");
|
|
|
|
if (!MacroExpandingLexersStack.empty() &&
|
|
MacroExpandingLexersStack.back().first == CurTokenLexer.get())
|
|
removeCachedMacroExpandedTokensOfLastLexer();
|
|
|
|
// Delete or cache the now-dead macro expander.
|
|
if (NumCachedTokenLexers == TokenLexerCacheSize)
|
|
CurTokenLexer.reset();
|
|
else
|
|
TokenLexerCache[NumCachedTokenLexers++] = CurTokenLexer.take();
|
|
|
|
// Handle this like a #include file being popped off the stack.
|
|
return HandleEndOfFile(Result, true);
|
|
}
|
|
|
|
/// RemoveTopOfLexerStack - Pop the current lexer/macro exp off the top of the
|
|
/// lexer stack. This should only be used in situations where the current
|
|
/// state of the top-of-stack lexer is unknown.
|
|
void Preprocessor::RemoveTopOfLexerStack() {
|
|
assert(!IncludeMacroStack.empty() && "Ran out of stack entries to load");
|
|
|
|
if (CurTokenLexer) {
|
|
// Delete or cache the now-dead macro expander.
|
|
if (NumCachedTokenLexers == TokenLexerCacheSize)
|
|
CurTokenLexer.reset();
|
|
else
|
|
TokenLexerCache[NumCachedTokenLexers++] = CurTokenLexer.take();
|
|
}
|
|
|
|
PopIncludeMacroStack();
|
|
}
|
|
|
|
/// HandleMicrosoftCommentPaste - When the macro expander pastes together a
|
|
/// comment (/##/) in microsoft mode, this method handles updating the current
|
|
/// state, returning the token on the next source line.
|
|
void Preprocessor::HandleMicrosoftCommentPaste(Token &Tok) {
|
|
assert(CurTokenLexer && !CurPPLexer &&
|
|
"Pasted comment can only be formed from macro");
|
|
|
|
// We handle this by scanning for the closest real lexer, switching it to
|
|
// raw mode and preprocessor mode. This will cause it to return \n as an
|
|
// explicit EOD token.
|
|
PreprocessorLexer *FoundLexer = 0;
|
|
bool LexerWasInPPMode = false;
|
|
for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) {
|
|
IncludeStackInfo &ISI = *(IncludeMacroStack.end()-i-1);
|
|
if (ISI.ThePPLexer == 0) continue; // Scan for a real lexer.
|
|
|
|
// Once we find a real lexer, mark it as raw mode (disabling macro
|
|
// expansions) and preprocessor mode (return EOD). We know that the lexer
|
|
// was *not* in raw mode before, because the macro that the comment came
|
|
// from was expanded. However, it could have already been in preprocessor
|
|
// mode (#if COMMENT) in which case we have to return it to that mode and
|
|
// return EOD.
|
|
FoundLexer = ISI.ThePPLexer;
|
|
FoundLexer->LexingRawMode = true;
|
|
LexerWasInPPMode = FoundLexer->ParsingPreprocessorDirective;
|
|
FoundLexer->ParsingPreprocessorDirective = true;
|
|
break;
|
|
}
|
|
|
|
// Okay, we either found and switched over the lexer, or we didn't find a
|
|
// lexer. In either case, finish off the macro the comment came from, getting
|
|
// the next token.
|
|
if (!HandleEndOfTokenLexer(Tok)) Lex(Tok);
|
|
|
|
// Discarding comments as long as we don't have EOF or EOD. This 'comments
|
|
// out' the rest of the line, including any tokens that came from other macros
|
|
// that were active, as in:
|
|
// #define submacro a COMMENT b
|
|
// submacro c
|
|
// which should lex to 'a' only: 'b' and 'c' should be removed.
|
|
while (Tok.isNot(tok::eod) && Tok.isNot(tok::eof))
|
|
Lex(Tok);
|
|
|
|
// If we got an eod token, then we successfully found the end of the line.
|
|
if (Tok.is(tok::eod)) {
|
|
assert(FoundLexer && "Can't get end of line without an active lexer");
|
|
// Restore the lexer back to normal mode instead of raw mode.
|
|
FoundLexer->LexingRawMode = false;
|
|
|
|
// If the lexer was already in preprocessor mode, just return the EOD token
|
|
// to finish the preprocessor line.
|
|
if (LexerWasInPPMode) return;
|
|
|
|
// Otherwise, switch out of PP mode and return the next lexed token.
|
|
FoundLexer->ParsingPreprocessorDirective = false;
|
|
return Lex(Tok);
|
|
}
|
|
|
|
// If we got an EOF token, then we reached the end of the token stream but
|
|
// didn't find an explicit \n. This can only happen if there was no lexer
|
|
// active (an active lexer would return EOD at EOF if there was no \n in
|
|
// preprocessor directive mode), so just return EOF as our token.
|
|
assert(!FoundLexer && "Lexer should return EOD before EOF in PP mode");
|
|
}
|