forked from OSchip/llvm-project
222 lines
8.8 KiB
C++
222 lines
8.8 KiB
C++
//===--- TokenConcatenation.cpp - Token Concatenation Avoidance -----------===//
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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 the TokenConcatenation class.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Lex/TokenConcatenation.h"
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#include "clang/Lex/Preprocessor.h"
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using namespace clang;
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/// StartsWithL - Return true if the spelling of this token starts with 'L'.
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bool TokenConcatenation::StartsWithL(const Token &Tok) const {
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if (!Tok.needsCleaning()) {
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SourceManager &SM = PP.getSourceManager();
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return *SM.getCharacterData(SM.getSpellingLoc(Tok.getLocation())) == 'L';
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}
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if (Tok.getLength() < 256) {
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char Buffer[256];
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const char *TokPtr = Buffer;
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PP.getSpelling(Tok, TokPtr);
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return TokPtr[0] == 'L';
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}
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return PP.getSpelling(Tok)[0] == 'L';
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}
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/// IsIdentifierL - Return true if the spelling of this token is literally
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/// 'L'.
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bool TokenConcatenation::IsIdentifierL(const Token &Tok) const {
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if (!Tok.needsCleaning()) {
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if (Tok.getLength() != 1)
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return false;
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SourceManager &SM = PP.getSourceManager();
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return *SM.getCharacterData(SM.getSpellingLoc(Tok.getLocation())) == 'L';
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}
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if (Tok.getLength() < 256) {
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char Buffer[256];
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const char *TokPtr = Buffer;
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if (PP.getSpelling(Tok, TokPtr) != 1)
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return false;
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return TokPtr[0] == 'L';
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}
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return PP.getSpelling(Tok) == "L";
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}
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TokenConcatenation::TokenConcatenation(Preprocessor &pp) : PP(pp) {
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memset(TokenInfo, 0, sizeof(TokenInfo));
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// These tokens have custom code in AvoidConcat.
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TokenInfo[tok::identifier ] |= aci_custom;
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TokenInfo[tok::numeric_constant] |= aci_custom_firstchar;
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TokenInfo[tok::period ] |= aci_custom_firstchar;
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TokenInfo[tok::amp ] |= aci_custom_firstchar;
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TokenInfo[tok::plus ] |= aci_custom_firstchar;
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TokenInfo[tok::minus ] |= aci_custom_firstchar;
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TokenInfo[tok::slash ] |= aci_custom_firstchar;
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TokenInfo[tok::less ] |= aci_custom_firstchar;
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TokenInfo[tok::greater ] |= aci_custom_firstchar;
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TokenInfo[tok::pipe ] |= aci_custom_firstchar;
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TokenInfo[tok::percent ] |= aci_custom_firstchar;
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TokenInfo[tok::colon ] |= aci_custom_firstchar;
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TokenInfo[tok::hash ] |= aci_custom_firstchar;
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TokenInfo[tok::arrow ] |= aci_custom_firstchar;
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// These tokens change behavior if followed by an '='.
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TokenInfo[tok::amp ] |= aci_avoid_equal; // &=
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TokenInfo[tok::plus ] |= aci_avoid_equal; // +=
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TokenInfo[tok::minus ] |= aci_avoid_equal; // -=
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TokenInfo[tok::slash ] |= aci_avoid_equal; // /=
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TokenInfo[tok::less ] |= aci_avoid_equal; // <=
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TokenInfo[tok::greater ] |= aci_avoid_equal; // >=
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TokenInfo[tok::pipe ] |= aci_avoid_equal; // |=
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TokenInfo[tok::percent ] |= aci_avoid_equal; // %=
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TokenInfo[tok::star ] |= aci_avoid_equal; // *=
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TokenInfo[tok::exclaim ] |= aci_avoid_equal; // !=
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TokenInfo[tok::lessless ] |= aci_avoid_equal; // <<=
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TokenInfo[tok::greaterequal] |= aci_avoid_equal; // >>=
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TokenInfo[tok::caret ] |= aci_avoid_equal; // ^=
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TokenInfo[tok::equal ] |= aci_avoid_equal; // ==
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}
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/// GetFirstChar - Get the first character of the token \arg Tok,
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/// avoiding calls to getSpelling where possible.
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static char GetFirstChar(Preprocessor &PP, const Token &Tok) {
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if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
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// Avoid spelling identifiers, the most common form of token.
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return II->getNameStart()[0];
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} else if (!Tok.needsCleaning()) {
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if (Tok.isLiteral() && Tok.getLiteralData()) {
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return *Tok.getLiteralData();
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} else {
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SourceManager &SM = PP.getSourceManager();
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return *SM.getCharacterData(SM.getSpellingLoc(Tok.getLocation()));
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}
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} else if (Tok.getLength() < 256) {
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char Buffer[256];
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const char *TokPtr = Buffer;
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PP.getSpelling(Tok, TokPtr);
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return TokPtr[0];
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} else {
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return PP.getSpelling(Tok)[0];
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}
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}
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/// AvoidConcat - If printing PrevTok immediately followed by Tok would cause
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/// the two individual tokens to be lexed as a single token, return true
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/// (which causes a space to be printed between them). This allows the output
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/// of -E mode to be lexed to the same token stream as lexing the input
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/// directly would.
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///
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/// This code must conservatively return true if it doesn't want to be 100%
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/// accurate. This will cause the output to include extra space characters,
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/// but the resulting output won't have incorrect concatenations going on.
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/// Examples include "..", which we print with a space between, because we
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/// don't want to track enough to tell "x.." from "...".
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bool TokenConcatenation::AvoidConcat(const Token &PrevTok,
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const Token &Tok) const {
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// First, check to see if the tokens were directly adjacent in the original
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// source. If they were, it must be okay to stick them together: if there
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// were an issue, the tokens would have been lexed differently.
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if (PrevTok.getLocation().isFileID() && Tok.getLocation().isFileID() &&
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PrevTok.getLocation().getFileLocWithOffset(PrevTok.getLength()) ==
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Tok.getLocation())
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return false;
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tok::TokenKind PrevKind = PrevTok.getKind();
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if (PrevTok.getIdentifierInfo()) // Language keyword or named operator.
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PrevKind = tok::identifier;
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// Look up information on when we should avoid concatenation with prevtok.
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unsigned ConcatInfo = TokenInfo[PrevKind];
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// If prevtok never causes a problem for anything after it, return quickly.
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if (ConcatInfo == 0) return false;
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if (ConcatInfo & aci_avoid_equal) {
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// If the next token is '=' or '==', avoid concatenation.
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if (Tok.is(tok::equal) || Tok.is(tok::equalequal))
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return true;
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ConcatInfo &= ~aci_avoid_equal;
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}
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if (ConcatInfo == 0) return false;
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// Basic algorithm: we look at the first character of the second token, and
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// determine whether it, if appended to the first token, would form (or
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// would contribute) to a larger token if concatenated.
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char FirstChar = 0;
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if (ConcatInfo & aci_custom) {
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// If the token does not need to know the first character, don't get it.
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} else {
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FirstChar = GetFirstChar(PP, Tok);
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}
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switch (PrevKind) {
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default: assert(0 && "InitAvoidConcatTokenInfo built wrong");
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case tok::identifier: // id+id or id+number or id+L"foo".
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// id+'.'... will not append.
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if (Tok.is(tok::numeric_constant))
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return GetFirstChar(PP, Tok) != '.';
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if (Tok.getIdentifierInfo() || Tok.is(tok::wide_string_literal) /* ||
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Tok.is(tok::wide_char_literal)*/)
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return true;
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// If this isn't identifier + string, we're done.
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if (Tok.isNot(tok::char_constant) && Tok.isNot(tok::string_literal))
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return false;
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// FIXME: need a wide_char_constant!
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// If the string was a wide string L"foo" or wide char L'f', it would
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// concat with the previous identifier into fooL"bar". Avoid this.
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if (StartsWithL(Tok))
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return true;
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// Otherwise, this is a narrow character or string. If the *identifier*
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// is a literal 'L', avoid pasting L "foo" -> L"foo".
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return IsIdentifierL(PrevTok);
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case tok::numeric_constant:
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return isalnum(FirstChar) || Tok.is(tok::numeric_constant) ||
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FirstChar == '+' || FirstChar == '-' || FirstChar == '.';
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case tok::period: // ..., .*, .1234
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return FirstChar == '.' || isdigit(FirstChar) ||
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(PP.getLangOptions().CPlusPlus && FirstChar == '*');
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case tok::amp: // &&
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return FirstChar == '&';
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case tok::plus: // ++
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return FirstChar == '+';
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case tok::minus: // --, ->, ->*
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return FirstChar == '-' || FirstChar == '>';
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case tok::slash: //, /*, //
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return FirstChar == '*' || FirstChar == '/';
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case tok::less: // <<, <<=, <:, <%
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return FirstChar == '<' || FirstChar == ':' || FirstChar == '%';
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case tok::greater: // >>, >>=
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return FirstChar == '>';
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case tok::pipe: // ||
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return FirstChar == '|';
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case tok::percent: // %>, %:
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return FirstChar == '>' || FirstChar == ':';
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case tok::colon: // ::, :>
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return FirstChar == '>' ||
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(PP.getLangOptions().CPlusPlus && FirstChar == ':');
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case tok::hash: // ##, #@, %:%:
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return FirstChar == '#' || FirstChar == '@' || FirstChar == '%';
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case tok::arrow: // ->*
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return PP.getLangOptions().CPlusPlus && FirstChar == '*';
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}
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}
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