Coverage Report

Created: 2019-02-23 12:57

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/tools/clang/lib/Rewrite/TokenRewriter.cpp
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//===- TokenRewriter.cpp - Token-based code rewriting interface -----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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//  This file implements the TokenRewriter class, which is used for code
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//  transformations.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Rewrite/Core/TokenRewriter.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Lex/ScratchBuffer.h"
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#include "clang/Lex/Token.h"
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#include <cassert>
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#include <cstring>
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#include <map>
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#include <utility>
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using namespace clang;
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TokenRewriter::TokenRewriter(FileID FID, SourceManager &SM,
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                             const LangOptions &LangOpts) {
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  ScratchBuf.reset(new ScratchBuffer(SM));
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  // Create a lexer to lex all the tokens of the main file in raw mode.
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  const llvm::MemoryBuffer *FromFile = SM.getBuffer(FID);
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  Lexer RawLex(FID, FromFile, SM, LangOpts);
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  // Return all comments and whitespace as tokens.
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  RawLex.SetKeepWhitespaceMode(true);
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  // Lex the file, populating our datastructures.
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  Token RawTok;
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  RawLex.LexFromRawLexer(RawTok);
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  while (RawTok.isNot(tok::eof)) {
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#if 0
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    if (Tok.is(tok::raw_identifier)) {
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      // Look up the identifier info for the token.  This should use
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      // IdentifierTable directly instead of PP.
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      PP.LookUpIdentifierInfo(Tok);
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    }
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#endif
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    AddToken(RawTok, TokenList.end());
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    RawLex.LexFromRawLexer(RawTok);
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  }
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}
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TokenRewriter::~TokenRewriter() = default;
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/// RemapIterator - Convert from token_iterator (a const iterator) to
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/// TokenRefTy (a non-const iterator).
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TokenRewriter::TokenRefTy TokenRewriter::RemapIterator(token_iterator I) {
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  if (I == token_end()) return TokenList.end();
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  // FIXME: This is horrible, we should use our own list or something to avoid
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  // this.
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  std::map<SourceLocation, TokenRefTy>::iterator MapIt =
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    TokenAtLoc.find(I->getLocation());
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  assert(MapIt != TokenAtLoc.end() && "iterator not in rewriter?");
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  return MapIt->second;
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}
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/// AddToken - Add the specified token into the Rewriter before the other
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/// position.
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TokenRewriter::TokenRefTy
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TokenRewriter::AddToken(const Token &T, TokenRefTy Where) {
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  Where = TokenList.insert(Where, T);
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  bool InsertSuccess = TokenAtLoc.insert(std::make_pair(T.getLocation(),
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                                                        Where)).second;
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  assert(InsertSuccess && "Token location already in rewriter!");
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  (void)InsertSuccess;
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  return Where;
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}
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TokenRewriter::token_iterator
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TokenRewriter::AddTokenBefore(token_iterator I, const char *Val) {
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  unsigned Len = strlen(Val);
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  // Plop the string into the scratch buffer, then create a token for this
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  // string.
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  Token Tok;
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  Tok.startToken();
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  const char *Spelling;
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  Tok.setLocation(ScratchBuf->getToken(Val, Len, Spelling));
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  Tok.setLength(Len);
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  // TODO: Form a whole lexer around this and relex the token!  For now, just
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  // set kind to tok::unknown.
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  Tok.setKind(tok::unknown);
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  return AddToken(Tok, RemapIterator(I));
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}