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-rw-r--r--lib/Lex/TokenConcatenation.cpp297
1 files changed, 0 insertions, 297 deletions
diff --git a/lib/Lex/TokenConcatenation.cpp b/lib/Lex/TokenConcatenation.cpp
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--- a/lib/Lex/TokenConcatenation.cpp
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-//===--- TokenConcatenation.cpp - Token Concatenation Avoidance -----------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements the TokenConcatenation class.
-//
-//===----------------------------------------------------------------------===//
-
-#include "clang/Lex/TokenConcatenation.h"
-#include "clang/Basic/CharInfo.h"
-#include "clang/Lex/Preprocessor.h"
-#include "llvm/Support/ErrorHandling.h"
-using namespace clang;
-
-
-/// IsStringPrefix - Return true if Str is a string prefix.
-/// 'L', 'u', 'U', or 'u8'. Including raw versions.
-static bool IsStringPrefix(StringRef Str, bool CPlusPlus11) {
-
- if (Str[0] == 'L' ||
- (CPlusPlus11 && (Str[0] == 'u' || Str[0] == 'U' || Str[0] == 'R'))) {
-
- if (Str.size() == 1)
- return true; // "L", "u", "U", and "R"
-
- // Check for raw flavors. Need to make sure the first character wasn't
- // already R. Need CPlusPlus11 check for "LR".
- if (Str[1] == 'R' && Str[0] != 'R' && Str.size() == 2 && CPlusPlus11)
- return true; // "LR", "uR", "UR"
-
- // Check for "u8" and "u8R"
- if (Str[0] == 'u' && Str[1] == '8') {
- if (Str.size() == 2) return true; // "u8"
- if (Str.size() == 3 && Str[2] == 'R') return true; // "u8R"
- }
- }
-
- return false;
-}
-
-/// IsIdentifierStringPrefix - Return true if the spelling of the token
-/// is literally 'L', 'u', 'U', or 'u8'. Including raw versions.
-bool TokenConcatenation::IsIdentifierStringPrefix(const Token &Tok) const {
- const LangOptions &LangOpts = PP.getLangOpts();
-
- if (!Tok.needsCleaning()) {
- if (Tok.getLength() < 1 || Tok.getLength() > 3)
- return false;
- SourceManager &SM = PP.getSourceManager();
- const char *Ptr = SM.getCharacterData(SM.getSpellingLoc(Tok.getLocation()));
- return IsStringPrefix(StringRef(Ptr, Tok.getLength()),
- LangOpts.CPlusPlus11);
- }
-
- if (Tok.getLength() < 256) {
- char Buffer[256];
- const char *TokPtr = Buffer;
- unsigned length = PP.getSpelling(Tok, TokPtr);
- return IsStringPrefix(StringRef(TokPtr, length), LangOpts.CPlusPlus11);
- }
-
- return IsStringPrefix(StringRef(PP.getSpelling(Tok)), LangOpts.CPlusPlus11);
-}
-
-TokenConcatenation::TokenConcatenation(const Preprocessor &pp) : PP(pp) {
- memset(TokenInfo, 0, sizeof(TokenInfo));
-
- // These tokens have custom code in AvoidConcat.
- TokenInfo[tok::identifier ] |= aci_custom;
- TokenInfo[tok::numeric_constant] |= aci_custom_firstchar;
- TokenInfo[tok::period ] |= aci_custom_firstchar;
- TokenInfo[tok::amp ] |= aci_custom_firstchar;
- TokenInfo[tok::plus ] |= aci_custom_firstchar;
- TokenInfo[tok::minus ] |= aci_custom_firstchar;
- TokenInfo[tok::slash ] |= aci_custom_firstchar;
- TokenInfo[tok::less ] |= aci_custom_firstchar;
- TokenInfo[tok::greater ] |= aci_custom_firstchar;
- TokenInfo[tok::pipe ] |= aci_custom_firstchar;
- TokenInfo[tok::percent ] |= aci_custom_firstchar;
- TokenInfo[tok::colon ] |= aci_custom_firstchar;
- TokenInfo[tok::hash ] |= aci_custom_firstchar;
- TokenInfo[tok::arrow ] |= aci_custom_firstchar;
-
- // These tokens have custom code in C++11 mode.
- if (PP.getLangOpts().CPlusPlus11) {
- TokenInfo[tok::string_literal ] |= aci_custom;
- TokenInfo[tok::wide_string_literal ] |= aci_custom;
- TokenInfo[tok::utf8_string_literal ] |= aci_custom;
- TokenInfo[tok::utf16_string_literal] |= aci_custom;
- TokenInfo[tok::utf32_string_literal] |= aci_custom;
- TokenInfo[tok::char_constant ] |= aci_custom;
- TokenInfo[tok::wide_char_constant ] |= aci_custom;
- TokenInfo[tok::utf16_char_constant ] |= aci_custom;
- TokenInfo[tok::utf32_char_constant ] |= aci_custom;
- }
-
- // These tokens have custom code in C++17 mode.
- if (PP.getLangOpts().CPlusPlus17)
- TokenInfo[tok::utf8_char_constant] |= aci_custom;
-
- // These tokens have custom code in C++2a mode.
- if (PP.getLangOpts().CPlusPlus2a)
- TokenInfo[tok::lessequal ] |= aci_custom_firstchar;
-
- // These tokens change behavior if followed by an '='.
- TokenInfo[tok::amp ] |= aci_avoid_equal; // &=
- TokenInfo[tok::plus ] |= aci_avoid_equal; // +=
- TokenInfo[tok::minus ] |= aci_avoid_equal; // -=
- TokenInfo[tok::slash ] |= aci_avoid_equal; // /=
- TokenInfo[tok::less ] |= aci_avoid_equal; // <=
- TokenInfo[tok::greater ] |= aci_avoid_equal; // >=
- TokenInfo[tok::pipe ] |= aci_avoid_equal; // |=
- TokenInfo[tok::percent ] |= aci_avoid_equal; // %=
- TokenInfo[tok::star ] |= aci_avoid_equal; // *=
- TokenInfo[tok::exclaim ] |= aci_avoid_equal; // !=
- TokenInfo[tok::lessless ] |= aci_avoid_equal; // <<=
- TokenInfo[tok::greatergreater] |= aci_avoid_equal; // >>=
- TokenInfo[tok::caret ] |= aci_avoid_equal; // ^=
- TokenInfo[tok::equal ] |= aci_avoid_equal; // ==
-}
-
-/// GetFirstChar - Get the first character of the token \arg Tok,
-/// avoiding calls to getSpelling where possible.
-static char GetFirstChar(const Preprocessor &PP, const Token &Tok) {
- if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
- // Avoid spelling identifiers, the most common form of token.
- return II->getNameStart()[0];
- } else if (!Tok.needsCleaning()) {
- if (Tok.isLiteral() && Tok.getLiteralData()) {
- return *Tok.getLiteralData();
- } else {
- SourceManager &SM = PP.getSourceManager();
- return *SM.getCharacterData(SM.getSpellingLoc(Tok.getLocation()));
- }
- } else if (Tok.getLength() < 256) {
- char Buffer[256];
- const char *TokPtr = Buffer;
- PP.getSpelling(Tok, TokPtr);
- return TokPtr[0];
- } else {
- return PP.getSpelling(Tok)[0];
- }
-}
-
-/// AvoidConcat - If printing PrevTok immediately followed by Tok would cause
-/// the two individual tokens to be lexed as a single token, return true
-/// (which causes a space to be printed between them). This allows the output
-/// of -E mode to be lexed to the same token stream as lexing the input
-/// directly would.
-///
-/// This code must conservatively return true if it doesn't want to be 100%
-/// accurate. This will cause the output to include extra space characters,
-/// but the resulting output won't have incorrect concatenations going on.
-/// Examples include "..", which we print with a space between, because we
-/// don't want to track enough to tell "x.." from "...".
-bool TokenConcatenation::AvoidConcat(const Token &PrevPrevTok,
- const Token &PrevTok,
- const Token &Tok) const {
- // Conservatively assume that every annotation token that has a printable
- // form requires whitespace.
- if (PrevTok.isAnnotation())
- return true;
-
- // First, check to see if the tokens were directly adjacent in the original
- // source. If they were, it must be okay to stick them together: if there
- // were an issue, the tokens would have been lexed differently.
- SourceManager &SM = PP.getSourceManager();
- SourceLocation PrevSpellLoc = SM.getSpellingLoc(PrevTok.getLocation());
- SourceLocation SpellLoc = SM.getSpellingLoc(Tok.getLocation());
- if (PrevSpellLoc.getLocWithOffset(PrevTok.getLength()) == SpellLoc)
- return false;
-
- tok::TokenKind PrevKind = PrevTok.getKind();
- if (!PrevTok.isAnnotation() && PrevTok.getIdentifierInfo())
- PrevKind = tok::identifier; // Language keyword or named operator.
-
- // Look up information on when we should avoid concatenation with prevtok.
- unsigned ConcatInfo = TokenInfo[PrevKind];
-
- // If prevtok never causes a problem for anything after it, return quickly.
- if (ConcatInfo == 0) return false;
-
- if (ConcatInfo & aci_avoid_equal) {
- // If the next token is '=' or '==', avoid concatenation.
- if (Tok.isOneOf(tok::equal, tok::equalequal))
- return true;
- ConcatInfo &= ~aci_avoid_equal;
- }
- if (Tok.isAnnotation()) {
- // Modules annotation can show up when generated automatically for includes.
- assert(Tok.isOneOf(tok::annot_module_include, tok::annot_module_begin,
- tok::annot_module_end) &&
- "unexpected annotation in AvoidConcat");
- ConcatInfo = 0;
- }
-
- if (ConcatInfo == 0)
- return false;
-
- // Basic algorithm: we look at the first character of the second token, and
- // determine whether it, if appended to the first token, would form (or
- // would contribute) to a larger token if concatenated.
- char FirstChar = 0;
- if (ConcatInfo & aci_custom) {
- // If the token does not need to know the first character, don't get it.
- } else {
- FirstChar = GetFirstChar(PP, Tok);
- }
-
- switch (PrevKind) {
- default:
- llvm_unreachable("InitAvoidConcatTokenInfo built wrong");
-
- case tok::raw_identifier:
- llvm_unreachable("tok::raw_identifier in non-raw lexing mode!");
-
- case tok::string_literal:
- case tok::wide_string_literal:
- case tok::utf8_string_literal:
- case tok::utf16_string_literal:
- case tok::utf32_string_literal:
- case tok::char_constant:
- case tok::wide_char_constant:
- case tok::utf8_char_constant:
- case tok::utf16_char_constant:
- case tok::utf32_char_constant:
- if (!PP.getLangOpts().CPlusPlus11)
- return false;
-
- // In C++11, a string or character literal followed by an identifier is a
- // single token.
- if (Tok.getIdentifierInfo())
- return true;
-
- // A ud-suffix is an identifier. If the previous token ends with one, treat
- // it as an identifier.
- if (!PrevTok.hasUDSuffix())
- return false;
- LLVM_FALLTHROUGH;
- case tok::identifier: // id+id or id+number or id+L"foo".
- // id+'.'... will not append.
- if (Tok.is(tok::numeric_constant))
- return GetFirstChar(PP, Tok) != '.';
-
- if (Tok.getIdentifierInfo() ||
- Tok.isOneOf(tok::wide_string_literal, tok::utf8_string_literal,
- tok::utf16_string_literal, tok::utf32_string_literal,
- tok::wide_char_constant, tok::utf8_char_constant,
- tok::utf16_char_constant, tok::utf32_char_constant))
- return true;
-
- // If this isn't identifier + string, we're done.
- if (Tok.isNot(tok::char_constant) && Tok.isNot(tok::string_literal))
- return false;
-
- // Otherwise, this is a narrow character or string. If the *identifier*
- // is a literal 'L', 'u8', 'u' or 'U', avoid pasting L "foo" -> L"foo".
- return IsIdentifierStringPrefix(PrevTok);
-
- case tok::numeric_constant:
- return isPreprocessingNumberBody(FirstChar) ||
- FirstChar == '+' || FirstChar == '-';
- case tok::period: // ..., .*, .1234
- return (FirstChar == '.' && PrevPrevTok.is(tok::period)) ||
- isDigit(FirstChar) ||
- (PP.getLangOpts().CPlusPlus && FirstChar == '*');
- case tok::amp: // &&
- return FirstChar == '&';
- case tok::plus: // ++
- return FirstChar == '+';
- case tok::minus: // --, ->, ->*
- return FirstChar == '-' || FirstChar == '>';
- case tok::slash: //, /*, //
- return FirstChar == '*' || FirstChar == '/';
- case tok::less: // <<, <<=, <:, <%
- return FirstChar == '<' || FirstChar == ':' || FirstChar == '%';
- case tok::greater: // >>, >>=
- return FirstChar == '>';
- case tok::pipe: // ||
- return FirstChar == '|';
- case tok::percent: // %>, %:
- return FirstChar == '>' || FirstChar == ':';
- case tok::colon: // ::, :>
- return FirstChar == '>' ||
- (PP.getLangOpts().CPlusPlus && FirstChar == ':');
- case tok::hash: // ##, #@, %:%:
- return FirstChar == '#' || FirstChar == '@' || FirstChar == '%';
- case tok::arrow: // ->*
- return PP.getLangOpts().CPlusPlus && FirstChar == '*';
- case tok::lessequal: // <=> (C++2a)
- return PP.getLangOpts().CPlusPlus2a && FirstChar == '>';
- }
-}
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