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//===--- Token.h - Token interface ------------------------------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file defines the Token interface.
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/TokenKinds.h"
#include "llvm/ADT/StringRef.h"
#include <cassert>
namespace clang {
class IdentifierInfo;
/// Token - This structure provides full information about a lexed token.
/// It is not intended to be space efficient, it is intended to return as much
/// information as possible about each returned token. This is expected to be
/// compressed into a smaller form if memory footprint is important.
/// The parser can create a special "annotation token" representing a stream of
/// tokens that were parsed and semantically resolved, e.g.: "foo::MyClass<int>"
/// can be represented by a single typename annotation token that carries
/// information about the SourceRange of the tokens and the type object.
class Token {
/// The location of the token. This is actually a SourceLocation.
unsigned Loc;
// Conceptually these next two fields could be in a union. However, this
// causes gcc 4.2 to pessimize LexTokenInternal, a very performance critical
// routine. Keeping as separate members with casts until a more beautiful fix
// presents itself.
/// UintData - This holds either the length of the token text, when
/// a normal token, or the end of the SourceRange when an annotation
/// token.
unsigned UintData;
/// PtrData - This is a union of four different pointer types, which depends
/// on what type of token this is:
/// Identifiers, keywords, etc:
/// This is an IdentifierInfo*, which contains the uniqued identifier
/// spelling.
/// Literals: isLiteral() returns true.
/// This is a pointer to the start of the token in a text buffer, which
/// may be dirty (have trigraphs / escaped newlines).
/// Annotations (resolved type names, C++ scopes, etc): isAnnotation().
/// This is a pointer to sema-specific data for the annotation token.
/// Eof:
// This is a pointer to a Decl.
/// Other:
/// This is null.
void *PtrData;
/// Kind - The actual flavor of token this is.
tok::TokenKind Kind;
/// Flags - Bits we track about this token, members of the TokenFlags enum.
unsigned short Flags;
// Various flags set per token:
enum TokenFlags {
StartOfLine = 0x01, // At start of line or only after whitespace
// (considering the line after macro expansion).
LeadingSpace = 0x02, // Whitespace exists before this token (considering
// whitespace after macro expansion).
DisableExpand = 0x04, // This identifier may never be macro expanded.
NeedsCleaning = 0x08, // Contained an escaped newline or trigraph.
LeadingEmptyMacro = 0x10, // Empty macro exists before this token.
HasUDSuffix = 0x20, // This string or character literal has a ud-suffix.
HasUCN = 0x40, // This identifier contains a UCN.
IgnoredComma = 0x80, // This comma is not a macro argument separator (MS).
StringifiedInMacro = 0x100, // This string or character literal is formed by
// macro stringizing or charizing operator.
CommaAfterElided = 0x200, // The comma following this token was elided (MS).
IsEditorPlaceholder = 0x400, // This identifier is a placeholder.
tok::TokenKind getKind() const { return Kind; }
void setKind(tok::TokenKind K) { Kind = K; }
/// is/isNot - Predicates to check if this token is a specific kind, as in
/// "if ( {...}".
bool is(tok::TokenKind K) const { return Kind == K; }
bool isNot(tok::TokenKind K) const { return Kind != K; }
bool isOneOf(tok::TokenKind K1, tok::TokenKind K2) const {
return is(K1) || is(K2);
template <typename... Ts>
bool isOneOf(tok::TokenKind K1, tok::TokenKind K2, Ts... Ks) const {
return is(K1) || isOneOf(K2, Ks...);
/// \brief Return true if this is a raw identifier (when lexing
/// in raw mode) or a non-keyword identifier (when lexing in non-raw mode).
bool isAnyIdentifier() const {
return tok::isAnyIdentifier(getKind());
/// \brief Return true if this is a "literal", like a numeric
/// constant, string, etc.
bool isLiteral() const {
return tok::isLiteral(getKind());
/// \brief Return true if this is any of tok::annot_* kind tokens.
bool isAnnotation() const {
return tok::isAnnotation(getKind());
/// \brief Return a source location identifier for the specified
/// offset in the current file.
SourceLocation getLocation() const {
return SourceLocation::getFromRawEncoding(Loc);
unsigned getLength() const {
assert(!isAnnotation() && "Annotation tokens have no length field");
return UintData;
void setLocation(SourceLocation L) { Loc = L.getRawEncoding(); }
void setLength(unsigned Len) {
assert(!isAnnotation() && "Annotation tokens have no length field");
UintData = Len;
SourceLocation getAnnotationEndLoc() const {
assert(isAnnotation() && "Used AnnotEndLocID on non-annotation token");
return SourceLocation::getFromRawEncoding(UintData ? UintData : Loc);
void setAnnotationEndLoc(SourceLocation L) {
assert(isAnnotation() && "Used AnnotEndLocID on non-annotation token");
UintData = L.getRawEncoding();
SourceLocation getLastLoc() const {
return isAnnotation() ? getAnnotationEndLoc() : getLocation();
SourceLocation getEndLoc() const {
return isAnnotation() ? getAnnotationEndLoc()
: getLocation().getLocWithOffset(getLength());
/// \brief SourceRange of the group of tokens that this annotation token
/// represents.
SourceRange getAnnotationRange() const {
return SourceRange(getLocation(), getAnnotationEndLoc());
void setAnnotationRange(SourceRange R) {
const char *getName() const { return tok::getTokenName(Kind); }
/// \brief Reset all flags to cleared.
void startToken() {
Kind = tok::unknown;
Flags = 0;
PtrData = nullptr;
UintData = 0;
Loc = SourceLocation().getRawEncoding();
IdentifierInfo *getIdentifierInfo() const {
assert(isNot(tok::raw_identifier) &&
"getIdentifierInfo() on a tok::raw_identifier token!");
assert(!isAnnotation() &&
"getIdentifierInfo() on an annotation token!");
if (isLiteral()) return nullptr;
if (is(tok::eof)) return nullptr;
return (IdentifierInfo*) PtrData;
void setIdentifierInfo(IdentifierInfo *II) {
PtrData = (void*) II;
const void *getEofData() const {
return reinterpret_cast<const void *>(PtrData);
void setEofData(const void *D) {
PtrData = const_cast<void *>(D);
/// getRawIdentifier - For a raw identifier token (i.e., an identifier
/// lexed in raw mode), returns a reference to the text substring in the
/// buffer if known.
StringRef getRawIdentifier() const {
return StringRef(reinterpret_cast<const char *>(PtrData), getLength());
void setRawIdentifierData(const char *Ptr) {
PtrData = const_cast<char*>(Ptr);
/// getLiteralData - For a literal token (numeric constant, string, etc), this
/// returns a pointer to the start of it in the text buffer if known, null
/// otherwise.
const char *getLiteralData() const {
assert(isLiteral() && "Cannot get literal data of non-literal");
return reinterpret_cast<const char*>(PtrData);
void setLiteralData(const char *Ptr) {
assert(isLiteral() && "Cannot set literal data of non-literal");
PtrData = const_cast<char*>(Ptr);
void *getAnnotationValue() const {
assert(isAnnotation() && "Used AnnotVal on non-annotation token");
return PtrData;
void setAnnotationValue(void *val) {
assert(isAnnotation() && "Used AnnotVal on non-annotation token");
PtrData = val;
/// \brief Set the specified flag.
void setFlag(TokenFlags Flag) {
Flags |= Flag;
/// \brief Get the specified flag.
bool getFlag(TokenFlags Flag) const {
return (Flags & Flag) != 0;
/// \brief Unset the specified flag.
void clearFlag(TokenFlags Flag) {
Flags &= ~Flag;
/// \brief Return the internal represtation of the flags.
/// This is only intended for low-level operations such as writing tokens to
/// disk.
unsigned getFlags() const {
return Flags;
/// \brief Set a flag to either true or false.
void setFlagValue(TokenFlags Flag, bool Val) {
if (Val)
/// isAtStartOfLine - Return true if this token is at the start of a line.
bool isAtStartOfLine() const { return getFlag(StartOfLine); }
/// \brief Return true if this token has whitespace before it.
bool hasLeadingSpace() const { return getFlag(LeadingSpace); }
/// \brief Return true if this identifier token should never
/// be expanded in the future, due to C99
bool isExpandDisabled() const { return getFlag(DisableExpand); }
/// \brief Return true if we have an ObjC keyword identifier.
bool isObjCAtKeyword(tok::ObjCKeywordKind objcKey) const;
/// \brief Return the ObjC keyword kind.
tok::ObjCKeywordKind getObjCKeywordID() const;
/// \brief Return true if this token has trigraphs or escaped newlines in it.
bool needsCleaning() const { return getFlag(NeedsCleaning); }
/// \brief Return true if this token has an empty macro before it.
bool hasLeadingEmptyMacro() const { return getFlag(LeadingEmptyMacro); }
/// \brief Return true if this token is a string or character literal which
/// has a ud-suffix.
bool hasUDSuffix() const { return getFlag(HasUDSuffix); }
/// Returns true if this token contains a universal character name.
bool hasUCN() const { return getFlag(HasUCN); }
/// Returns true if this token is formed by macro by stringizing or charizing
/// operator.
bool stringifiedInMacro() const { return getFlag(StringifiedInMacro); }
/// Returns true if the comma after this token was elided.
bool commaAfterElided() const { return getFlag(CommaAfterElided); }
/// Returns true if this token is an editor placeholder.
/// Editor placeholders are produced by the code-completion engine and are
/// represented as characters between '<#' and '#>' in the source code. The
/// lexer uses identifier tokens to represent placeholders.
bool isEditorPlaceholder() const { return getFlag(IsEditorPlaceholder); }
/// \brief Information about the conditional stack (\#if directives)
/// currently active.
struct PPConditionalInfo {
/// \brief Location where the conditional started.
SourceLocation IfLoc;
/// \brief True if this was contained in a skipping directive, e.g.,
/// in a "\#if 0" block.
bool WasSkipping;
/// \brief True if we have emitted tokens already, and now we're in
/// an \#else block or something. Only useful in Skipping blocks.
bool FoundNonSkip;
/// \brief True if we've seen a \#else in this block. If so,
/// \#elif/\#else directives are not allowed.
bool FoundElse;
} // end namespace clang
namespace llvm {
template <>
struct isPodLike<clang::Token> { static const bool value = true; };
} // end namespace llvm