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858 lines
34 KiB
858 lines
34 KiB
//===--- TokenLexer.cpp - Lex from a token stream -------------------------===//
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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 TokenLexer interface.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Lex/TokenLexer.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Lex/LexDiagnostic.h"
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#include "clang/Lex/MacroArgs.h"
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#include "clang/Lex/MacroInfo.h"
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#include "clang/Lex/Preprocessor.h"
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#include "llvm/ADT/SmallString.h"
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using namespace clang;
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/// Create a TokenLexer for the specified macro with the specified actual
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/// arguments. Note that this ctor takes ownership of the ActualArgs pointer.
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void TokenLexer::Init(Token &Tok, SourceLocation ELEnd, MacroInfo *MI,
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MacroArgs *Actuals) {
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// If the client is reusing a TokenLexer, make sure to free any memory
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// associated with it.
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destroy();
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Macro = MI;
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ActualArgs = Actuals;
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CurToken = 0;
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ExpandLocStart = Tok.getLocation();
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ExpandLocEnd = ELEnd;
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AtStartOfLine = Tok.isAtStartOfLine();
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HasLeadingSpace = Tok.hasLeadingSpace();
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NextTokGetsSpace = false;
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Tokens = &*Macro->tokens_begin();
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OwnsTokens = false;
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DisableMacroExpansion = false;
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NumTokens = Macro->tokens_end()-Macro->tokens_begin();
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MacroExpansionStart = SourceLocation();
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SourceManager &SM = PP.getSourceManager();
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MacroStartSLocOffset = SM.getNextLocalOffset();
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if (NumTokens > 0) {
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assert(Tokens[0].getLocation().isValid());
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assert((Tokens[0].getLocation().isFileID() || Tokens[0].is(tok::comment)) &&
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"Macro defined in macro?");
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assert(ExpandLocStart.isValid());
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// Reserve a source location entry chunk for the length of the macro
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// definition. Tokens that get lexed directly from the definition will
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// have their locations pointing inside this chunk. This is to avoid
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// creating separate source location entries for each token.
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MacroDefStart = SM.getExpansionLoc(Tokens[0].getLocation());
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MacroDefLength = Macro->getDefinitionLength(SM);
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MacroExpansionStart = SM.createExpansionLoc(MacroDefStart,
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ExpandLocStart,
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ExpandLocEnd,
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MacroDefLength);
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}
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// If this is a function-like macro, expand the arguments and change
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// Tokens to point to the expanded tokens.
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if (Macro->isFunctionLike() && Macro->getNumArgs())
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ExpandFunctionArguments();
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// Mark the macro as currently disabled, so that it is not recursively
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// expanded. The macro must be disabled only after argument pre-expansion of
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// function-like macro arguments occurs.
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Macro->DisableMacro();
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}
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/// Create a TokenLexer for the specified token stream. This does not
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/// take ownership of the specified token vector.
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void TokenLexer::Init(const Token *TokArray, unsigned NumToks,
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bool disableMacroExpansion, bool ownsTokens) {
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// If the client is reusing a TokenLexer, make sure to free any memory
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// associated with it.
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destroy();
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Macro = nullptr;
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ActualArgs = nullptr;
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Tokens = TokArray;
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OwnsTokens = ownsTokens;
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DisableMacroExpansion = disableMacroExpansion;
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NumTokens = NumToks;
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CurToken = 0;
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ExpandLocStart = ExpandLocEnd = SourceLocation();
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AtStartOfLine = false;
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HasLeadingSpace = false;
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NextTokGetsSpace = false;
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MacroExpansionStart = SourceLocation();
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// Set HasLeadingSpace/AtStartOfLine so that the first token will be
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// returned unmodified.
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if (NumToks != 0) {
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AtStartOfLine = TokArray[0].isAtStartOfLine();
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HasLeadingSpace = TokArray[0].hasLeadingSpace();
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}
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}
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void TokenLexer::destroy() {
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// If this was a function-like macro that actually uses its arguments, delete
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// the expanded tokens.
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if (OwnsTokens) {
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delete [] Tokens;
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Tokens = nullptr;
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OwnsTokens = false;
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}
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// TokenLexer owns its formal arguments.
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if (ActualArgs) ActualArgs->destroy(PP);
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}
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bool TokenLexer::MaybeRemoveCommaBeforeVaArgs(
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SmallVectorImpl<Token> &ResultToks, bool HasPasteOperator, MacroInfo *Macro,
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unsigned MacroArgNo, Preprocessor &PP) {
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// Is the macro argument __VA_ARGS__?
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if (!Macro->isVariadic() || MacroArgNo != Macro->getNumArgs()-1)
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return false;
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// In Microsoft-compatibility mode, a comma is removed in the expansion
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// of " ... , __VA_ARGS__ " if __VA_ARGS__ is empty. This extension is
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// not supported by gcc.
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if (!HasPasteOperator && !PP.getLangOpts().MSVCCompat)
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return false;
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// GCC removes the comma in the expansion of " ... , ## __VA_ARGS__ " if
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// __VA_ARGS__ is empty, but not in strict C99 mode where there are no
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// named arguments, where it remains. In all other modes, including C99
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// with GNU extensions, it is removed regardless of named arguments.
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// Microsoft also appears to support this extension, unofficially.
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if (PP.getLangOpts().C99 && !PP.getLangOpts().GNUMode
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&& Macro->getNumArgs() < 2)
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return false;
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// Is a comma available to be removed?
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if (ResultToks.empty() || !ResultToks.back().is(tok::comma))
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return false;
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// Issue an extension diagnostic for the paste operator.
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if (HasPasteOperator)
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PP.Diag(ResultToks.back().getLocation(), diag::ext_paste_comma);
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// Remove the comma.
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ResultToks.pop_back();
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if (!ResultToks.empty()) {
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// If the comma was right after another paste (e.g. "X##,##__VA_ARGS__"),
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// then removal of the comma should produce a placemarker token (in C99
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// terms) which we model by popping off the previous ##, giving us a plain
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// "X" when __VA_ARGS__ is empty.
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if (ResultToks.back().is(tok::hashhash))
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ResultToks.pop_back();
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// Remember that this comma was elided.
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ResultToks.back().setFlag(Token::CommaAfterElided);
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}
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// Never add a space, even if the comma, ##, or arg had a space.
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NextTokGetsSpace = false;
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return true;
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}
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/// Expand the arguments of a function-like macro so that we can quickly
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/// return preexpanded tokens from Tokens.
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void TokenLexer::ExpandFunctionArguments() {
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SmallVector<Token, 128> ResultToks;
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// Loop through 'Tokens', expanding them into ResultToks. Keep
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// track of whether we change anything. If not, no need to keep them. If so,
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// we install the newly expanded sequence as the new 'Tokens' list.
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bool MadeChange = false;
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for (unsigned i = 0, e = NumTokens; i != e; ++i) {
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// If we found the stringify operator, get the argument stringified. The
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// preprocessor already verified that the following token is a macro name
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// when the #define was parsed.
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const Token &CurTok = Tokens[i];
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if (i != 0 && !Tokens[i-1].is(tok::hashhash) && CurTok.hasLeadingSpace())
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NextTokGetsSpace = true;
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if (CurTok.isOneOf(tok::hash, tok::hashat)) {
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int ArgNo = Macro->getArgumentNum(Tokens[i+1].getIdentifierInfo());
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assert(ArgNo != -1 && "Token following # is not an argument?");
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SourceLocation ExpansionLocStart =
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getExpansionLocForMacroDefLoc(CurTok.getLocation());
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SourceLocation ExpansionLocEnd =
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getExpansionLocForMacroDefLoc(Tokens[i+1].getLocation());
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Token Res;
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if (CurTok.is(tok::hash)) // Stringify
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Res = ActualArgs->getStringifiedArgument(ArgNo, PP,
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ExpansionLocStart,
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ExpansionLocEnd);
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else {
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// 'charify': don't bother caching these.
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Res = MacroArgs::StringifyArgument(ActualArgs->getUnexpArgument(ArgNo),
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PP, true,
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ExpansionLocStart,
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ExpansionLocEnd);
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}
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Res.setFlag(Token::StringifiedInMacro);
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// The stringified/charified string leading space flag gets set to match
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// the #/#@ operator.
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if (NextTokGetsSpace)
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Res.setFlag(Token::LeadingSpace);
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ResultToks.push_back(Res);
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MadeChange = true;
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++i; // Skip arg name.
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NextTokGetsSpace = false;
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continue;
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}
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// Find out if there is a paste (##) operator before or after the token.
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bool NonEmptyPasteBefore =
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!ResultToks.empty() && ResultToks.back().is(tok::hashhash);
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bool PasteBefore = i != 0 && Tokens[i-1].is(tok::hashhash);
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bool PasteAfter = i+1 != e && Tokens[i+1].is(tok::hashhash);
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assert(!NonEmptyPasteBefore || PasteBefore);
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// Otherwise, if this is not an argument token, just add the token to the
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// output buffer.
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IdentifierInfo *II = CurTok.getIdentifierInfo();
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int ArgNo = II ? Macro->getArgumentNum(II) : -1;
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if (ArgNo == -1) {
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// This isn't an argument, just add it.
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ResultToks.push_back(CurTok);
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if (NextTokGetsSpace) {
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ResultToks.back().setFlag(Token::LeadingSpace);
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NextTokGetsSpace = false;
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} else if (PasteBefore && !NonEmptyPasteBefore)
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ResultToks.back().clearFlag(Token::LeadingSpace);
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continue;
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}
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// An argument is expanded somehow, the result is different than the
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// input.
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MadeChange = true;
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// Otherwise, this is a use of the argument.
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// In Microsoft mode, remove the comma before __VA_ARGS__ to ensure there
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// are no trailing commas if __VA_ARGS__ is empty.
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if (!PasteBefore && ActualArgs->isVarargsElidedUse() &&
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MaybeRemoveCommaBeforeVaArgs(ResultToks,
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/*HasPasteOperator=*/false,
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Macro, ArgNo, PP))
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continue;
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// If it is not the LHS/RHS of a ## operator, we must pre-expand the
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// argument and substitute the expanded tokens into the result. This is
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// C99 6.10.3.1p1.
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if (!PasteBefore && !PasteAfter) {
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const Token *ResultArgToks;
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// Only preexpand the argument if it could possibly need it. This
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// avoids some work in common cases.
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const Token *ArgTok = ActualArgs->getUnexpArgument(ArgNo);
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if (ActualArgs->ArgNeedsPreexpansion(ArgTok, PP))
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ResultArgToks = &ActualArgs->getPreExpArgument(ArgNo, Macro, PP)[0];
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else
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ResultArgToks = ArgTok; // Use non-preexpanded tokens.
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// If the arg token expanded into anything, append it.
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if (ResultArgToks->isNot(tok::eof)) {
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unsigned FirstResult = ResultToks.size();
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unsigned NumToks = MacroArgs::getArgLength(ResultArgToks);
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ResultToks.append(ResultArgToks, ResultArgToks+NumToks);
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// In Microsoft-compatibility mode, we follow MSVC's preprocessing
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// behavior by not considering single commas from nested macro
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// expansions as argument separators. Set a flag on the token so we can
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// test for this later when the macro expansion is processed.
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if (PP.getLangOpts().MSVCCompat && NumToks == 1 &&
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ResultToks.back().is(tok::comma))
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ResultToks.back().setFlag(Token::IgnoredComma);
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// If the '##' came from expanding an argument, turn it into 'unknown'
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// to avoid pasting.
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for (unsigned i = FirstResult, e = ResultToks.size(); i != e; ++i) {
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Token &Tok = ResultToks[i];
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if (Tok.is(tok::hashhash))
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Tok.setKind(tok::unknown);
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}
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if(ExpandLocStart.isValid()) {
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updateLocForMacroArgTokens(CurTok.getLocation(),
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ResultToks.begin()+FirstResult,
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ResultToks.end());
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}
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// If any tokens were substituted from the argument, the whitespace
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// before the first token should match the whitespace of the arg
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// identifier.
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ResultToks[FirstResult].setFlagValue(Token::LeadingSpace,
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NextTokGetsSpace);
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ResultToks[FirstResult].setFlagValue(Token::StartOfLine, false);
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NextTokGetsSpace = false;
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}
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continue;
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}
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// Okay, we have a token that is either the LHS or RHS of a paste (##)
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// argument. It gets substituted as its non-pre-expanded tokens.
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const Token *ArgToks = ActualArgs->getUnexpArgument(ArgNo);
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unsigned NumToks = MacroArgs::getArgLength(ArgToks);
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if (NumToks) { // Not an empty argument?
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// If this is the GNU ", ## __VA_ARGS__" extension, and we just learned
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// that __VA_ARGS__ expands to multiple tokens, avoid a pasting error when
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// the expander trys to paste ',' with the first token of the __VA_ARGS__
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// expansion.
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if (NonEmptyPasteBefore && ResultToks.size() >= 2 &&
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ResultToks[ResultToks.size()-2].is(tok::comma) &&
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(unsigned)ArgNo == Macro->getNumArgs()-1 &&
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Macro->isVariadic()) {
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// Remove the paste operator, report use of the extension.
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PP.Diag(ResultToks.pop_back_val().getLocation(), diag::ext_paste_comma);
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}
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ResultToks.append(ArgToks, ArgToks+NumToks);
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// If the '##' came from expanding an argument, turn it into 'unknown'
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// to avoid pasting.
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for (unsigned i = ResultToks.size() - NumToks, e = ResultToks.size();
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i != e; ++i) {
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Token &Tok = ResultToks[i];
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if (Tok.is(tok::hashhash))
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Tok.setKind(tok::unknown);
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}
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if (ExpandLocStart.isValid()) {
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updateLocForMacroArgTokens(CurTok.getLocation(),
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ResultToks.end()-NumToks, ResultToks.end());
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}
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// If this token (the macro argument) was supposed to get leading
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// whitespace, transfer this information onto the first token of the
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// expansion.
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//
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// Do not do this if the paste operator occurs before the macro argument,
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// as in "A ## MACROARG". In valid code, the first token will get
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// smooshed onto the preceding one anyway (forming AMACROARG). In
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// assembler-with-cpp mode, invalid pastes are allowed through: in this
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// case, we do not want the extra whitespace to be added. For example,
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// we want ". ## foo" -> ".foo" not ". foo".
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if (NextTokGetsSpace)
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ResultToks[ResultToks.size()-NumToks].setFlag(Token::LeadingSpace);
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NextTokGetsSpace = false;
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continue;
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}
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// If an empty argument is on the LHS or RHS of a paste, the standard (C99
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// 6.10.3.3p2,3) calls for a bunch of placemarker stuff to occur. We
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// implement this by eating ## operators when a LHS or RHS expands to
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// empty.
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if (PasteAfter) {
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// Discard the argument token and skip (don't copy to the expansion
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// buffer) the paste operator after it.
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++i;
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continue;
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}
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// If this is on the RHS of a paste operator, we've already copied the
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// paste operator to the ResultToks list, unless the LHS was empty too.
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// Remove it.
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assert(PasteBefore);
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if (NonEmptyPasteBefore) {
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assert(ResultToks.back().is(tok::hashhash));
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ResultToks.pop_back();
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}
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// If this is the __VA_ARGS__ token, and if the argument wasn't provided,
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// and if the macro had at least one real argument, and if the token before
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// the ## was a comma, remove the comma. This is a GCC extension which is
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// disabled when using -std=c99.
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if (ActualArgs->isVarargsElidedUse())
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MaybeRemoveCommaBeforeVaArgs(ResultToks,
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/*HasPasteOperator=*/true,
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Macro, ArgNo, PP);
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}
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// If anything changed, install this as the new Tokens list.
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if (MadeChange) {
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assert(!OwnsTokens && "This would leak if we already own the token list");
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// This is deleted in the dtor.
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NumTokens = ResultToks.size();
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// The tokens will be added to Preprocessor's cache and will be removed
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// when this TokenLexer finishes lexing them.
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Tokens = PP.cacheMacroExpandedTokens(this, ResultToks);
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// The preprocessor cache of macro expanded tokens owns these tokens,not us.
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OwnsTokens = false;
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}
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}
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/// \brief Checks if two tokens form wide string literal.
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static bool isWideStringLiteralFromMacro(const Token &FirstTok,
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const Token &SecondTok) {
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return FirstTok.is(tok::identifier) &&
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FirstTok.getIdentifierInfo()->isStr("L") && SecondTok.isLiteral() &&
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SecondTok.stringifiedInMacro();
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}
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/// Lex - Lex and return a token from this macro stream.
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///
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bool TokenLexer::Lex(Token &Tok) {
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// Lexing off the end of the macro, pop this macro off the expansion stack.
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if (isAtEnd()) {
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// If this is a macro (not a token stream), mark the macro enabled now
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// that it is no longer being expanded.
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if (Macro) Macro->EnableMacro();
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Tok.startToken();
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Tok.setFlagValue(Token::StartOfLine , AtStartOfLine);
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Tok.setFlagValue(Token::LeadingSpace, HasLeadingSpace || NextTokGetsSpace);
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if (CurToken == 0)
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Tok.setFlag(Token::LeadingEmptyMacro);
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return PP.HandleEndOfTokenLexer(Tok);
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}
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SourceManager &SM = PP.getSourceManager();
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// If this is the first token of the expanded result, we inherit spacing
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// properties later.
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bool isFirstToken = CurToken == 0;
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// Get the next token to return.
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Tok = Tokens[CurToken++];
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bool TokenIsFromPaste = false;
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// If this token is followed by a token paste (##) operator, paste the tokens!
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// Note that ## is a normal token when not expanding a macro.
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if (!isAtEnd() && Macro &&
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(Tokens[CurToken].is(tok::hashhash) ||
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// Special processing of L#x macros in -fms-compatibility mode.
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// Microsoft compiler is able to form a wide string literal from
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// 'L#macro_arg' construct in a function-like macro.
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(PP.getLangOpts().MSVCCompat &&
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isWideStringLiteralFromMacro(Tok, Tokens[CurToken])))) {
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// When handling the microsoft /##/ extension, the final token is
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// returned by PasteTokens, not the pasted token.
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if (PasteTokens(Tok))
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return true;
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TokenIsFromPaste = true;
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}
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// The token's current location indicate where the token was lexed from. We
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// need this information to compute the spelling of the token, but any
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// diagnostics for the expanded token should appear as if they came from
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// ExpansionLoc. Pull this information together into a new SourceLocation
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// that captures all of this.
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if (ExpandLocStart.isValid() && // Don't do this for token streams.
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// Check that the token's location was not already set properly.
|
|
SM.isBeforeInSLocAddrSpace(Tok.getLocation(), MacroStartSLocOffset)) {
|
|
SourceLocation instLoc;
|
|
if (Tok.is(tok::comment)) {
|
|
instLoc = SM.createExpansionLoc(Tok.getLocation(),
|
|
ExpandLocStart,
|
|
ExpandLocEnd,
|
|
Tok.getLength());
|
|
} else {
|
|
instLoc = getExpansionLocForMacroDefLoc(Tok.getLocation());
|
|
}
|
|
|
|
Tok.setLocation(instLoc);
|
|
}
|
|
|
|
// If this is the first token, set the lexical properties of the token to
|
|
// match the lexical properties of the macro identifier.
|
|
if (isFirstToken) {
|
|
Tok.setFlagValue(Token::StartOfLine , AtStartOfLine);
|
|
Tok.setFlagValue(Token::LeadingSpace, HasLeadingSpace);
|
|
} else {
|
|
// If this is not the first token, we may still need to pass through
|
|
// leading whitespace if we've expanded a macro.
|
|
if (AtStartOfLine) Tok.setFlag(Token::StartOfLine);
|
|
if (HasLeadingSpace) Tok.setFlag(Token::LeadingSpace);
|
|
}
|
|
AtStartOfLine = false;
|
|
HasLeadingSpace = false;
|
|
|
|
// Handle recursive expansion!
|
|
if (!Tok.isAnnotation() && Tok.getIdentifierInfo() != nullptr) {
|
|
// Change the kind of this identifier to the appropriate token kind, e.g.
|
|
// turning "for" into a keyword.
|
|
IdentifierInfo *II = Tok.getIdentifierInfo();
|
|
Tok.setKind(II->getTokenID());
|
|
|
|
// If this identifier was poisoned and from a paste, emit an error. This
|
|
// won't be handled by Preprocessor::HandleIdentifier because this is coming
|
|
// from a macro expansion.
|
|
if (II->isPoisoned() && TokenIsFromPaste) {
|
|
PP.HandlePoisonedIdentifier(Tok);
|
|
}
|
|
|
|
if (!DisableMacroExpansion && II->isHandleIdentifierCase())
|
|
return PP.HandleIdentifier(Tok);
|
|
}
|
|
|
|
// Otherwise, return a normal token.
|
|
return true;
|
|
}
|
|
|
|
/// PasteTokens - Tok is the LHS of a ## operator, and CurToken is the ##
|
|
/// operator. Read the ## and RHS, and paste the LHS/RHS together. If there
|
|
/// are more ## after it, chomp them iteratively. Return the result as Tok.
|
|
/// If this returns true, the caller should immediately return the token.
|
|
bool TokenLexer::PasteTokens(Token &Tok) {
|
|
// MSVC: If previous token was pasted, this must be a recovery from an invalid
|
|
// paste operation. Ignore spaces before this token to mimic MSVC output.
|
|
// Required for generating valid UUID strings in some MS headers.
|
|
if (PP.getLangOpts().MicrosoftExt && (CurToken >= 2) &&
|
|
Tokens[CurToken - 2].is(tok::hashhash))
|
|
Tok.clearFlag(Token::LeadingSpace);
|
|
|
|
SmallString<128> Buffer;
|
|
const char *ResultTokStrPtr = nullptr;
|
|
SourceLocation StartLoc = Tok.getLocation();
|
|
SourceLocation PasteOpLoc;
|
|
do {
|
|
// Consume the ## operator if any.
|
|
PasteOpLoc = Tokens[CurToken].getLocation();
|
|
if (Tokens[CurToken].is(tok::hashhash))
|
|
++CurToken;
|
|
assert(!isAtEnd() && "No token on the RHS of a paste operator!");
|
|
|
|
// Get the RHS token.
|
|
const Token &RHS = Tokens[CurToken];
|
|
|
|
// Allocate space for the result token. This is guaranteed to be enough for
|
|
// the two tokens.
|
|
Buffer.resize(Tok.getLength() + RHS.getLength());
|
|
|
|
// Get the spelling of the LHS token in Buffer.
|
|
const char *BufPtr = &Buffer[0];
|
|
bool Invalid = false;
|
|
unsigned LHSLen = PP.getSpelling(Tok, BufPtr, &Invalid);
|
|
if (BufPtr != &Buffer[0]) // Really, we want the chars in Buffer!
|
|
memcpy(&Buffer[0], BufPtr, LHSLen);
|
|
if (Invalid)
|
|
return true;
|
|
|
|
BufPtr = Buffer.data() + LHSLen;
|
|
unsigned RHSLen = PP.getSpelling(RHS, BufPtr, &Invalid);
|
|
if (Invalid)
|
|
return true;
|
|
if (RHSLen && BufPtr != &Buffer[LHSLen])
|
|
// Really, we want the chars in Buffer!
|
|
memcpy(&Buffer[LHSLen], BufPtr, RHSLen);
|
|
|
|
// Trim excess space.
|
|
Buffer.resize(LHSLen+RHSLen);
|
|
|
|
// Plop the pasted result (including the trailing newline and null) into a
|
|
// scratch buffer where we can lex it.
|
|
Token ResultTokTmp;
|
|
ResultTokTmp.startToken();
|
|
|
|
// Claim that the tmp token is a string_literal so that we can get the
|
|
// character pointer back from CreateString in getLiteralData().
|
|
ResultTokTmp.setKind(tok::string_literal);
|
|
PP.CreateString(Buffer, ResultTokTmp);
|
|
SourceLocation ResultTokLoc = ResultTokTmp.getLocation();
|
|
ResultTokStrPtr = ResultTokTmp.getLiteralData();
|
|
|
|
// Lex the resultant pasted token into Result.
|
|
Token Result;
|
|
|
|
if (Tok.isAnyIdentifier() && RHS.isAnyIdentifier()) {
|
|
// Common paste case: identifier+identifier = identifier. Avoid creating
|
|
// a lexer and other overhead.
|
|
PP.IncrementPasteCounter(true);
|
|
Result.startToken();
|
|
Result.setKind(tok::raw_identifier);
|
|
Result.setRawIdentifierData(ResultTokStrPtr);
|
|
Result.setLocation(ResultTokLoc);
|
|
Result.setLength(LHSLen+RHSLen);
|
|
} else {
|
|
PP.IncrementPasteCounter(false);
|
|
|
|
assert(ResultTokLoc.isFileID() &&
|
|
"Should be a raw location into scratch buffer");
|
|
SourceManager &SourceMgr = PP.getSourceManager();
|
|
FileID LocFileID = SourceMgr.getFileID(ResultTokLoc);
|
|
|
|
bool Invalid = false;
|
|
const char *ScratchBufStart
|
|
= SourceMgr.getBufferData(LocFileID, &Invalid).data();
|
|
if (Invalid)
|
|
return false;
|
|
|
|
// Make a lexer to lex this string from. Lex just this one token.
|
|
// Make a lexer object so that we lex and expand the paste result.
|
|
Lexer TL(SourceMgr.getLocForStartOfFile(LocFileID),
|
|
PP.getLangOpts(), ScratchBufStart,
|
|
ResultTokStrPtr, ResultTokStrPtr+LHSLen+RHSLen);
|
|
|
|
// Lex a token in raw mode. This way it won't look up identifiers
|
|
// automatically, lexing off the end will return an eof token, and
|
|
// warnings are disabled. This returns true if the result token is the
|
|
// entire buffer.
|
|
bool isInvalid = !TL.LexFromRawLexer(Result);
|
|
|
|
// If we got an EOF token, we didn't form even ONE token. For example, we
|
|
// did "/ ## /" to get "//".
|
|
isInvalid |= Result.is(tok::eof);
|
|
|
|
// If pasting the two tokens didn't form a full new token, this is an
|
|
// error. This occurs with "x ## +" and other stuff. Return with Tok
|
|
// unmodified and with RHS as the next token to lex.
|
|
if (isInvalid) {
|
|
// Explicitly convert the token location to have proper expansion
|
|
// information so that the user knows where it came from.
|
|
SourceManager &SM = PP.getSourceManager();
|
|
SourceLocation Loc =
|
|
SM.createExpansionLoc(PasteOpLoc, ExpandLocStart, ExpandLocEnd, 2);
|
|
|
|
// Test for the Microsoft extension of /##/ turning into // here on the
|
|
// error path.
|
|
if (PP.getLangOpts().MicrosoftExt && Tok.is(tok::slash) &&
|
|
RHS.is(tok::slash)) {
|
|
HandleMicrosoftCommentPaste(Tok, Loc);
|
|
return true;
|
|
}
|
|
|
|
// Do not emit the error when preprocessing assembler code.
|
|
if (!PP.getLangOpts().AsmPreprocessor) {
|
|
// If we're in microsoft extensions mode, downgrade this from a hard
|
|
// error to an extension that defaults to an error. This allows
|
|
// disabling it.
|
|
PP.Diag(Loc, PP.getLangOpts().MicrosoftExt ? diag::ext_pp_bad_paste_ms
|
|
: diag::err_pp_bad_paste)
|
|
<< Buffer;
|
|
}
|
|
|
|
// An error has occurred so exit loop.
|
|
break;
|
|
}
|
|
|
|
// Turn ## into 'unknown' to avoid # ## # from looking like a paste
|
|
// operator.
|
|
if (Result.is(tok::hashhash))
|
|
Result.setKind(tok::unknown);
|
|
}
|
|
|
|
// Transfer properties of the LHS over the Result.
|
|
Result.setFlagValue(Token::StartOfLine , Tok.isAtStartOfLine());
|
|
Result.setFlagValue(Token::LeadingSpace, Tok.hasLeadingSpace());
|
|
|
|
// Finally, replace LHS with the result, consume the RHS, and iterate.
|
|
++CurToken;
|
|
Tok = Result;
|
|
} while (!isAtEnd() && Tokens[CurToken].is(tok::hashhash));
|
|
|
|
SourceLocation EndLoc = Tokens[CurToken - 1].getLocation();
|
|
|
|
// The token's current location indicate where the token was lexed from. We
|
|
// need this information to compute the spelling of the token, but any
|
|
// diagnostics for the expanded token should appear as if the token was
|
|
// expanded from the full ## expression. Pull this information together into
|
|
// a new SourceLocation that captures all of this.
|
|
SourceManager &SM = PP.getSourceManager();
|
|
if (StartLoc.isFileID())
|
|
StartLoc = getExpansionLocForMacroDefLoc(StartLoc);
|
|
if (EndLoc.isFileID())
|
|
EndLoc = getExpansionLocForMacroDefLoc(EndLoc);
|
|
FileID MacroFID = SM.getFileID(MacroExpansionStart);
|
|
while (SM.getFileID(StartLoc) != MacroFID)
|
|
StartLoc = SM.getImmediateExpansionRange(StartLoc).first;
|
|
while (SM.getFileID(EndLoc) != MacroFID)
|
|
EndLoc = SM.getImmediateExpansionRange(EndLoc).second;
|
|
|
|
Tok.setLocation(SM.createExpansionLoc(Tok.getLocation(), StartLoc, EndLoc,
|
|
Tok.getLength()));
|
|
|
|
// Now that we got the result token, it will be subject to expansion. Since
|
|
// token pasting re-lexes the result token in raw mode, identifier information
|
|
// isn't looked up. As such, if the result is an identifier, look up id info.
|
|
if (Tok.is(tok::raw_identifier)) {
|
|
// Look up the identifier info for the token. We disabled identifier lookup
|
|
// by saying we're skipping contents, so we need to do this manually.
|
|
PP.LookUpIdentifierInfo(Tok);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// isNextTokenLParen - If the next token lexed will pop this macro off the
|
|
/// expansion stack, return 2. If the next unexpanded token is a '(', return
|
|
/// 1, otherwise return 0.
|
|
unsigned TokenLexer::isNextTokenLParen() const {
|
|
// Out of tokens?
|
|
if (isAtEnd())
|
|
return 2;
|
|
return Tokens[CurToken].is(tok::l_paren);
|
|
}
|
|
|
|
/// isParsingPreprocessorDirective - Return true if we are in the middle of a
|
|
/// preprocessor directive.
|
|
bool TokenLexer::isParsingPreprocessorDirective() const {
|
|
return Tokens[NumTokens-1].is(tok::eod) && !isAtEnd();
|
|
}
|
|
|
|
/// HandleMicrosoftCommentPaste - In microsoft compatibility mode, /##/ pastes
|
|
/// together to form a comment that comments out everything in the current
|
|
/// macro, other active macros, and anything left on the current physical
|
|
/// source line of the expanded buffer. Handle this by returning the
|
|
/// first token on the next line.
|
|
void TokenLexer::HandleMicrosoftCommentPaste(Token &Tok, SourceLocation OpLoc) {
|
|
PP.Diag(OpLoc, diag::ext_comment_paste_microsoft);
|
|
|
|
// We 'comment out' the rest of this macro by just ignoring the rest of the
|
|
// tokens that have not been lexed yet, if any.
|
|
|
|
// Since this must be a macro, mark the macro enabled now that it is no longer
|
|
// being expanded.
|
|
assert(Macro && "Token streams can't paste comments");
|
|
Macro->EnableMacro();
|
|
|
|
PP.HandleMicrosoftCommentPaste(Tok);
|
|
}
|
|
|
|
/// \brief If \arg loc is a file ID and points inside the current macro
|
|
/// definition, returns the appropriate source location pointing at the
|
|
/// macro expansion source location entry, otherwise it returns an invalid
|
|
/// SourceLocation.
|
|
SourceLocation
|
|
TokenLexer::getExpansionLocForMacroDefLoc(SourceLocation loc) const {
|
|
assert(ExpandLocStart.isValid() && MacroExpansionStart.isValid() &&
|
|
"Not appropriate for token streams");
|
|
assert(loc.isValid() && loc.isFileID());
|
|
|
|
SourceManager &SM = PP.getSourceManager();
|
|
assert(SM.isInSLocAddrSpace(loc, MacroDefStart, MacroDefLength) &&
|
|
"Expected loc to come from the macro definition");
|
|
|
|
unsigned relativeOffset = 0;
|
|
SM.isInSLocAddrSpace(loc, MacroDefStart, MacroDefLength, &relativeOffset);
|
|
return MacroExpansionStart.getLocWithOffset(relativeOffset);
|
|
}
|
|
|
|
/// \brief Finds the tokens that are consecutive (from the same FileID)
|
|
/// creates a single SLocEntry, and assigns SourceLocations to each token that
|
|
/// point to that SLocEntry. e.g for
|
|
/// assert(foo == bar);
|
|
/// There will be a single SLocEntry for the "foo == bar" chunk and locations
|
|
/// for the 'foo', '==', 'bar' tokens will point inside that chunk.
|
|
///
|
|
/// \arg begin_tokens will be updated to a position past all the found
|
|
/// consecutive tokens.
|
|
static void updateConsecutiveMacroArgTokens(SourceManager &SM,
|
|
SourceLocation InstLoc,
|
|
Token *&begin_tokens,
|
|
Token * end_tokens) {
|
|
assert(begin_tokens < end_tokens);
|
|
|
|
SourceLocation FirstLoc = begin_tokens->getLocation();
|
|
SourceLocation CurLoc = FirstLoc;
|
|
|
|
// Compare the source location offset of tokens and group together tokens that
|
|
// are close, even if their locations point to different FileIDs. e.g.
|
|
//
|
|
// |bar | foo | cake | (3 tokens from 3 consecutive FileIDs)
|
|
// ^ ^
|
|
// |bar foo cake| (one SLocEntry chunk for all tokens)
|
|
//
|
|
// we can perform this "merge" since the token's spelling location depends
|
|
// on the relative offset.
|
|
|
|
Token *NextTok = begin_tokens + 1;
|
|
for (; NextTok < end_tokens; ++NextTok) {
|
|
SourceLocation NextLoc = NextTok->getLocation();
|
|
if (CurLoc.isFileID() != NextLoc.isFileID())
|
|
break; // Token from different kind of FileID.
|
|
|
|
int RelOffs;
|
|
if (!SM.isInSameSLocAddrSpace(CurLoc, NextLoc, &RelOffs))
|
|
break; // Token from different local/loaded location.
|
|
// Check that token is not before the previous token or more than 50
|
|
// "characters" away.
|
|
if (RelOffs < 0 || RelOffs > 50)
|
|
break;
|
|
|
|
if (CurLoc.isMacroID() && !SM.isWrittenInSameFile(CurLoc, NextLoc))
|
|
break; // Token from a different macro.
|
|
|
|
CurLoc = NextLoc;
|
|
}
|
|
|
|
// For the consecutive tokens, find the length of the SLocEntry to contain
|
|
// all of them.
|
|
Token &LastConsecutiveTok = *(NextTok-1);
|
|
int LastRelOffs = 0;
|
|
SM.isInSameSLocAddrSpace(FirstLoc, LastConsecutiveTok.getLocation(),
|
|
&LastRelOffs);
|
|
unsigned FullLength = LastRelOffs + LastConsecutiveTok.getLength();
|
|
|
|
// Create a macro expansion SLocEntry that will "contain" all of the tokens.
|
|
SourceLocation Expansion =
|
|
SM.createMacroArgExpansionLoc(FirstLoc, InstLoc,FullLength);
|
|
|
|
// Change the location of the tokens from the spelling location to the new
|
|
// expanded location.
|
|
for (; begin_tokens < NextTok; ++begin_tokens) {
|
|
Token &Tok = *begin_tokens;
|
|
int RelOffs = 0;
|
|
SM.isInSameSLocAddrSpace(FirstLoc, Tok.getLocation(), &RelOffs);
|
|
Tok.setLocation(Expansion.getLocWithOffset(RelOffs));
|
|
}
|
|
}
|
|
|
|
/// \brief Creates SLocEntries and updates the locations of macro argument
|
|
/// tokens to their new expanded locations.
|
|
///
|
|
/// \param ArgIdDefLoc the location of the macro argument id inside the macro
|
|
/// definition.
|
|
/// \param Tokens the macro argument tokens to update.
|
|
void TokenLexer::updateLocForMacroArgTokens(SourceLocation ArgIdSpellLoc,
|
|
Token *begin_tokens,
|
|
Token *end_tokens) {
|
|
SourceManager &SM = PP.getSourceManager();
|
|
|
|
SourceLocation InstLoc =
|
|
getExpansionLocForMacroDefLoc(ArgIdSpellLoc);
|
|
|
|
while (begin_tokens < end_tokens) {
|
|
// If there's only one token just create a SLocEntry for it.
|
|
if (end_tokens - begin_tokens == 1) {
|
|
Token &Tok = *begin_tokens;
|
|
Tok.setLocation(SM.createMacroArgExpansionLoc(Tok.getLocation(),
|
|
InstLoc,
|
|
Tok.getLength()));
|
|
return;
|
|
}
|
|
|
|
updateConsecutiveMacroArgTokens(SM, InstLoc, begin_tokens, end_tokens);
|
|
}
|
|
}
|
|
|
|
void TokenLexer::PropagateLineStartLeadingSpaceInfo(Token &Result) {
|
|
AtStartOfLine = Result.isAtStartOfLine();
|
|
HasLeadingSpace = Result.hasLeadingSpace();
|
|
}
|