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llvm-project/clang/lib/Lex/TokenLexer.cpp

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//===--- TokenLexer.cpp - Lex from a token stream -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the TokenLexer interface.
//
//===----------------------------------------------------------------------===//
#include "clang/Lex/TokenLexer.h"
#include "clang/Lex/MacroArgs.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/LexDiagnostic.h"
#include "clang/Lex/MacroInfo.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/SmallString.h"
using namespace clang;
/// Create a TokenLexer for the specified macro with the specified actual
/// arguments. Note that this ctor takes ownership of the ActualArgs pointer.
void TokenLexer::Init(Token &Tok, SourceLocation ELEnd, MacroInfo *MI,
MacroArgs *Actuals) {
// If the client is reusing a TokenLexer, make sure to free any memory
// associated with it.
destroy();
Macro = MI;
ActualArgs = Actuals;
CurToken = 0;
ExpandLocStart = Tok.getLocation();
ExpandLocEnd = ELEnd;
AtStartOfLine = Tok.isAtStartOfLine();
HasLeadingSpace = Tok.hasLeadingSpace();
Tokens = &*Macro->tokens_begin();
OwnsTokens = false;
DisableMacroExpansion = false;
NumTokens = Macro->tokens_end()-Macro->tokens_begin();
MacroExpansionStart = SourceLocation();
SourceManager &SM = PP.getSourceManager();
MacroStartSLocOffset = SM.getNextLocalOffset();
if (NumTokens > 0) {
assert(Tokens[0].getLocation().isValid());
assert((Tokens[0].getLocation().isFileID() || Tokens[0].is(tok::comment)) &&
"Macro defined in macro?");
assert(ExpandLocStart.isValid());
// Reserve a source location entry chunk for the length of the macro
// definition. Tokens that get lexed directly from the definition will
// have their locations pointing inside this chunk. This is to avoid
// creating separate source location entries for each token.
MacroDefStart = SM.getExpansionLoc(Tokens[0].getLocation());
MacroDefLength = Macro->getDefinitionLength(SM);
MacroExpansionStart = SM.createExpansionLoc(MacroDefStart,
ExpandLocStart,
ExpandLocEnd,
MacroDefLength);
}
// If this is a function-like macro, expand the arguments and change
// Tokens to point to the expanded tokens.
if (Macro->isFunctionLike() && Macro->getNumArgs())
ExpandFunctionArguments();
// Mark the macro as currently disabled, so that it is not recursively
// expanded. The macro must be disabled only after argument pre-expansion of
// function-like macro arguments occurs.
Macro->DisableMacro();
}
/// Create a TokenLexer for the specified token stream. This does not
/// take ownership of the specified token vector.
void TokenLexer::Init(const Token *TokArray, unsigned NumToks,
bool disableMacroExpansion, bool ownsTokens) {
// If the client is reusing a TokenLexer, make sure to free any memory
// associated with it.
destroy();
Macro = 0;
ActualArgs = 0;
Tokens = TokArray;
OwnsTokens = ownsTokens;
DisableMacroExpansion = disableMacroExpansion;
NumTokens = NumToks;
CurToken = 0;
ExpandLocStart = ExpandLocEnd = SourceLocation();
AtStartOfLine = false;
HasLeadingSpace = false;
MacroExpansionStart = SourceLocation();
// Set HasLeadingSpace/AtStartOfLine so that the first token will be
// returned unmodified.
if (NumToks != 0) {
AtStartOfLine = TokArray[0].isAtStartOfLine();
HasLeadingSpace = TokArray[0].hasLeadingSpace();
}
}
void TokenLexer::destroy() {
// If this was a function-like macro that actually uses its arguments, delete
// the expanded tokens.
if (OwnsTokens) {
delete [] Tokens;
Tokens = 0;
OwnsTokens = false;
}
// TokenLexer owns its formal arguments.
if (ActualArgs) ActualArgs->destroy(PP);
}
/// Remove comma ahead of __VA_ARGS__, if present, according to compiler dialect
/// settings. Returns true if the comma is removed.
static bool MaybeRemoveCommaBeforeVaArgs(SmallVectorImpl<Token> &ResultToks,
bool &NextTokGetsSpace,
bool HasPasteOperator,
MacroInfo *Macro, unsigned MacroArgNo,
Preprocessor &PP) {
// Is the macro argument __VA_ARGS__?
if (!Macro->isVariadic() || MacroArgNo != Macro->getNumArgs()-1)
return false;
// In Microsoft-compatibility mode, a comma is removed in the expansion
// of " ... , __VA_ARGS__ " if __VA_ARGS__ is empty. This extension is
// not supported by gcc.
if (!HasPasteOperator && !PP.getLangOpts().MicrosoftMode)
return false;
// GCC removes the comma in the expansion of " ... , ## __VA_ARGS__ " if
// __VA_ARGS__ is empty, but not in strict C99 mode where there are no
// named arguments, where it remains. In all other modes, including C99
// with GNU extensions, it is removed regardless of named arguments.
// Microsoft also appears to support this extension, unofficially.
if (PP.getLangOpts().C99 && !PP.getLangOpts().GNUMode
&& Macro->getNumArgs() < 2)
return false;
// Is a comma available to be removed?
if (ResultToks.empty() || !ResultToks.back().is(tok::comma))
return false;
// Issue an extension diagnostic for the paste operator.
if (HasPasteOperator)
PP.Diag(ResultToks.back().getLocation(), diag::ext_paste_comma);
// Remove the comma.
ResultToks.pop_back();
// If the comma was right after another paste (e.g. "X##,##__VA_ARGS__"),
// then removal of the comma should produce a placemarker token (in C99
// terms) which we model by popping off the previous ##, giving us a plain
// "X" when __VA_ARGS__ is empty.
if (!ResultToks.empty() && ResultToks.back().is(tok::hashhash))
ResultToks.pop_back();
// Never add a space, even if the comma, ##, or arg had a space.
NextTokGetsSpace = false;
return true;
}
/// Expand the arguments of a function-like macro so that we can quickly
/// return preexpanded tokens from Tokens.
void TokenLexer::ExpandFunctionArguments() {
SmallVector<Token, 128> ResultToks;
// Loop through 'Tokens', expanding them into ResultToks. Keep
// track of whether we change anything. If not, no need to keep them. If so,
// we install the newly expanded sequence as the new 'Tokens' list.
bool MadeChange = false;
// NextTokGetsSpace - When this is true, the next token appended to the
// output list will get a leading space, regardless of whether it had one to
// begin with or not. This is used for placemarker support.
bool NextTokGetsSpace = false;
for (unsigned i = 0, e = NumTokens; i != e; ++i) {
// If we found the stringify operator, get the argument stringified. The
// preprocessor already verified that the following token is a macro name
// when the #define was parsed.
const Token &CurTok = Tokens[i];
if (CurTok.is(tok::hash) || CurTok.is(tok::hashat)) {
int ArgNo = Macro->getArgumentNum(Tokens[i+1].getIdentifierInfo());
assert(ArgNo != -1 && "Token following # is not an argument?");
SourceLocation ExpansionLocStart =
getExpansionLocForMacroDefLoc(CurTok.getLocation());
SourceLocation ExpansionLocEnd =
getExpansionLocForMacroDefLoc(Tokens[i+1].getLocation());
Token Res;
if (CurTok.is(tok::hash)) // Stringify
Res = ActualArgs->getStringifiedArgument(ArgNo, PP,
ExpansionLocStart,
ExpansionLocEnd);
else {
// 'charify': don't bother caching these.
Res = MacroArgs::StringifyArgument(ActualArgs->getUnexpArgument(ArgNo),
PP, true,
ExpansionLocStart,
ExpansionLocEnd);
}
// The stringified/charified string leading space flag gets set to match
// the #/#@ operator.
if (CurTok.hasLeadingSpace() || NextTokGetsSpace)
Res.setFlag(Token::LeadingSpace);
ResultToks.push_back(Res);
MadeChange = true;
++i; // Skip arg name.
NextTokGetsSpace = false;
continue;
}
// Otherwise, if this is not an argument token, just add the token to the
// output buffer.
IdentifierInfo *II = CurTok.getIdentifierInfo();
int ArgNo = II ? Macro->getArgumentNum(II) : -1;
if (ArgNo == -1) {
// This isn't an argument, just add it.
ResultToks.push_back(CurTok);
if (NextTokGetsSpace) {
ResultToks.back().setFlag(Token::LeadingSpace);
NextTokGetsSpace = false;
}
continue;
}
// An argument is expanded somehow, the result is different than the
// input.
MadeChange = true;
// Otherwise, this is a use of the argument. Find out if there is a paste
// (##) operator before or after the argument.
bool NonEmptyPasteBefore =
!ResultToks.empty() && ResultToks.back().is(tok::hashhash);
bool PasteBefore = i != 0 && Tokens[i-1].is(tok::hashhash);
bool PasteAfter = i+1 != e && Tokens[i+1].is(tok::hashhash);
assert(!NonEmptyPasteBefore || PasteBefore);
// In Microsoft mode, remove the comma before __VA_ARGS__ to ensure there
// are no trailing commas if __VA_ARGS__ is empty.
if (!PasteBefore && ActualArgs->isVarargsElidedUse() &&
MaybeRemoveCommaBeforeVaArgs(ResultToks, NextTokGetsSpace,
/*HasPasteOperator=*/false,
Macro, ArgNo, PP))
continue;
// If it is not the LHS/RHS of a ## operator, we must pre-expand the
// argument and substitute the expanded tokens into the result. This is
// C99 6.10.3.1p1.
if (!PasteBefore && !PasteAfter) {
const Token *ResultArgToks;
// Only preexpand the argument if it could possibly need it. This
// avoids some work in common cases.
const Token *ArgTok = ActualArgs->getUnexpArgument(ArgNo);
if (ActualArgs->ArgNeedsPreexpansion(ArgTok, PP))
ResultArgToks = &ActualArgs->getPreExpArgument(ArgNo, Macro, PP)[0];
else
ResultArgToks = ArgTok; // Use non-preexpanded tokens.
// If the arg token expanded into anything, append it.
if (ResultArgToks->isNot(tok::eof)) {
unsigned FirstResult = ResultToks.size();
unsigned NumToks = MacroArgs::getArgLength(ResultArgToks);
ResultToks.append(ResultArgToks, ResultArgToks+NumToks);
// In Microsoft-compatibility mode, we follow MSVC's preprocessing
// behavior by not considering single commas from nested macro
// expansions as argument separators. Set a flag on the token so we can
// test for this later when the macro expansion is processed.
if (PP.getLangOpts().MicrosoftMode && NumToks == 1 &&
ResultToks.back().is(tok::comma))
ResultToks.back().setFlag(Token::IgnoredComma);
// If the '##' came from expanding an argument, turn it into 'unknown'
// to avoid pasting.
for (unsigned i = FirstResult, e = ResultToks.size(); i != e; ++i) {
Token &Tok = ResultToks[i];
if (Tok.is(tok::hashhash))
Tok.setKind(tok::unknown);
}
if(ExpandLocStart.isValid()) {
updateLocForMacroArgTokens(CurTok.getLocation(),
ResultToks.begin()+FirstResult,
ResultToks.end());
}
// If any tokens were substituted from the argument, the whitespace
// before the first token should match the whitespace of the arg
// identifier.
ResultToks[FirstResult].setFlagValue(Token::LeadingSpace,
CurTok.hasLeadingSpace() ||
NextTokGetsSpace);
NextTokGetsSpace = false;
} else {
// If this is an empty argument, and if there was whitespace before the
// formal token, make sure the next token gets whitespace before it.
NextTokGetsSpace = CurTok.hasLeadingSpace();
}
continue;
}
// Okay, we have a token that is either the LHS or RHS of a paste (##)
// argument. It gets substituted as its non-pre-expanded tokens.
const Token *ArgToks = ActualArgs->getUnexpArgument(ArgNo);
unsigned NumToks = MacroArgs::getArgLength(ArgToks);
if (NumToks) { // Not an empty argument?
// If this is the GNU ", ## __VA_ARGS__" extension, and we just learned
// that __VA_ARGS__ expands to multiple tokens, avoid a pasting error when
// the expander trys to paste ',' with the first token of the __VA_ARGS__
// expansion.
if (NonEmptyPasteBefore && ResultToks.size() >= 2 &&
ResultToks[ResultToks.size()-2].is(tok::comma) &&
(unsigned)ArgNo == Macro->getNumArgs()-1 &&
Macro->isVariadic()) {
// Remove the paste operator, report use of the extension.
PP.Diag(ResultToks.back().getLocation(), diag::ext_paste_comma);
ResultToks.pop_back();
}
ResultToks.append(ArgToks, ArgToks+NumToks);
// If the '##' came from expanding an argument, turn it into 'unknown'
// to avoid pasting.
for (unsigned i = ResultToks.size() - NumToks, e = ResultToks.size();
i != e; ++i) {
Token &Tok = ResultToks[i];
if (Tok.is(tok::hashhash))
Tok.setKind(tok::unknown);
}
if (ExpandLocStart.isValid()) {
updateLocForMacroArgTokens(CurTok.getLocation(),
ResultToks.end()-NumToks, ResultToks.end());
}
// If this token (the macro argument) was supposed to get leading
// whitespace, transfer this information onto the first token of the
// expansion.
//
// Do not do this if the paste operator occurs before the macro argument,
// as in "A ## MACROARG". In valid code, the first token will get
// smooshed onto the preceding one anyway (forming AMACROARG). In
// assembler-with-cpp mode, invalid pastes are allowed through: in this
// case, we do not want the extra whitespace to be added. For example,
// we want ". ## foo" -> ".foo" not ". foo".
if ((CurTok.hasLeadingSpace() || NextTokGetsSpace) &&
!NonEmptyPasteBefore)
ResultToks[ResultToks.size()-NumToks].setFlag(Token::LeadingSpace);
NextTokGetsSpace = false;
continue;
}
// If an empty argument is on the LHS or RHS of a paste, the standard (C99
// 6.10.3.3p2,3) calls for a bunch of placemarker stuff to occur. We
// implement this by eating ## operators when a LHS or RHS expands to
// empty.
NextTokGetsSpace |= CurTok.hasLeadingSpace();
if (PasteAfter) {
// Discard the argument token and skip (don't copy to the expansion
// buffer) the paste operator after it.
NextTokGetsSpace |= Tokens[i+1].hasLeadingSpace();
++i;
continue;
}
// If this is on the RHS of a paste operator, we've already copied the
// paste operator to the ResultToks list, unless the LHS was empty too.
// Remove it.
assert(PasteBefore);
if (NonEmptyPasteBefore) {
assert(ResultToks.back().is(tok::hashhash));
NextTokGetsSpace |= ResultToks.back().hasLeadingSpace();
ResultToks.pop_back();
}
// If this is the __VA_ARGS__ token, and if the argument wasn't provided,
// and if the macro had at least one real argument, and if the token before
// the ## was a comma, remove the comma. This is a GCC extension which is
// disabled when using -std=c99.
if (ActualArgs->isVarargsElidedUse())
MaybeRemoveCommaBeforeVaArgs(ResultToks, NextTokGetsSpace,
/*HasPasteOperator=*/true,
Macro, ArgNo, PP);
continue;
}
// If anything changed, install this as the new Tokens list.
if (MadeChange) {
assert(!OwnsTokens && "This would leak if we already own the token list");
// This is deleted in the dtor.
NumTokens = ResultToks.size();
// The tokens will be added to Preprocessor's cache and will be removed
// when this TokenLexer finishes lexing them.
Tokens = PP.cacheMacroExpandedTokens(this, ResultToks);
// The preprocessor cache of macro expanded tokens owns these tokens,not us.
OwnsTokens = false;
}
}
/// Lex - Lex and return a token from this macro stream.
///
void TokenLexer::Lex(Token &Tok) {
// Lexing off the end of the macro, pop this macro off the expansion stack.
if (isAtEnd()) {
// If this is a macro (not a token stream), mark the macro enabled now
// that it is no longer being expanded.
if (Macro) Macro->EnableMacro();
// Pop this context off the preprocessors lexer stack and get the next
// token. This will delete "this" so remember the PP instance var.
Preprocessor &PPCache = PP;
if (PP.HandleEndOfTokenLexer(Tok))
return;
// HandleEndOfTokenLexer may not return a token. If it doesn't, lex
// whatever is next.
return PPCache.Lex(Tok);
}
SourceManager &SM = PP.getSourceManager();
// If this is the first token of the expanded result, we inherit spacing
// properties later.
bool isFirstToken = CurToken == 0;
// Get the next token to return.
Tok = Tokens[CurToken++];
bool TokenIsFromPaste = false;
// If this token is followed by a token paste (##) operator, paste the tokens!
// Note that ## is a normal token when not expanding a macro.
if (!isAtEnd() && Tokens[CurToken].is(tok::hashhash) && Macro) {
// When handling the microsoft /##/ extension, the final token is
// returned by PasteTokens, not the pasted token.
if (PasteTokens(Tok))
return;
TokenIsFromPaste = true;
}
// 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 they came from
// ExpansionLoc. Pull this information together into a new SourceLocation
// that captures all of this.
if (ExpandLocStart.isValid() && // Don't do this for token streams.
// 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);
}
// Handle recursive expansion!
if (!Tok.isAnnotation() && Tok.getIdentifierInfo() != 0) {
// 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())
PP.HandleIdentifier(Tok);
}
// Otherwise, return a normal token.
}
/// 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) {
SmallString<128> Buffer;
const char *ResultTokStrPtr = 0;
SourceLocation StartLoc = Tok.getLocation();
SourceLocation PasteOpLoc;
do {
// Consume the ## operator.
PasteOpLoc = Tokens[CurToken].getLocation();
++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[LHSLen];
unsigned RHSLen = PP.getSpelling(RHS, BufPtr, &Invalid);
if (Invalid)
return true;
if (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) {
// 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);
return true;
}
// Do not emit the error when preprocessing assembler code.
if (!PP.getLangOpts().AsmPreprocessor) {
// 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);
// If we're in microsoft extensions mode, downgrade this from a hard
// error to a warning that defaults to an error. This allows
// disabling it.
PP.Diag(Loc,
PP.getLangOpts().MicrosoftExt ? diag::err_pp_bad_paste_ms
: diag::err_pp_bad_paste)
<< Buffer.str();
}
// 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) {
// 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;
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);
}
}
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