path: root/include/clang/Basic/SourceLocation.h

//===--- SourceLocation.h - Compact identifier for Source Files -*- 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 SourceLocation class.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_SOURCELOCATION_H
#define LLVM_CLANG_SOURCELOCATION_H

#include <utility>
#include <cassert>

namespace llvm {
  class MemoryBuffer;
  class raw_ostream;
  class StringRef;
  template <typename T> struct DenseMapInfo;
  template <typename T> struct isPodLike;
}

namespace clang {

class SourceManager;

/// FileID - This is an opaque identifier used by SourceManager which refers to
/// a source file (MemoryBuffer) along with its #include path and #line data.
///
class FileID {
  /// ID - Opaque identifier, 0 is "invalid".
  unsigned ID;
public:
  FileID() : ID(0) {}

  bool isInvalid() const { return ID == 0; }

  bool operator==(const FileID &RHS) const { return ID == RHS.ID; }
  bool operator<(const FileID &RHS) const { return ID < RHS.ID; }
  bool operator<=(const FileID &RHS) const { return ID <= RHS.ID; }
  bool operator!=(const FileID &RHS) const { return !(*this == RHS); }
  bool operator>(const FileID &RHS) const { return RHS < *this; }
  bool operator>=(const FileID &RHS) const { return RHS <= *this; }

  static FileID getSentinel() { return get(~0U); }
  unsigned getHashValue() const { return ID; }

private:
  friend class SourceManager;
  static FileID get(unsigned V) {
    FileID F;
    F.ID = V;
    return F;
  }
  unsigned getOpaqueValue() const { return ID; }
};


/// SourceLocation - This is a carefully crafted 32-bit identifier that encodes
/// a full include stack, line and column number information for a position in
/// an input translation unit.
class SourceLocation {
  unsigned ID;
  friend class SourceManager;
  enum {
    MacroIDBit = 1U << 31
  };
public:

  SourceLocation() : ID(0) {}  // 0 is an invalid FileID.

  bool isFileID() const  { return (ID & MacroIDBit) == 0; }
  bool isMacroID() const { return (ID & MacroIDBit) != 0; }

  /// isValid - Return true if this is a valid SourceLocation object.  Invalid
  /// SourceLocations are often used when events have no corresponding location
  /// in the source (e.g. a diagnostic is required for a command line option).
  ///
  bool isValid() const { return ID != 0; }
  bool isInvalid() const { return ID == 0; }

private:
  /// getOffset - Return the index for SourceManager's SLocEntryTable table,
  /// note that this is not an index *into* it though.
  unsigned getOffset() const {
    return ID & ~MacroIDBit;
  }

  static SourceLocation getFileLoc(unsigned ID) {
    assert((ID & MacroIDBit) == 0 && "Ran out of source locations!");
    SourceLocation L;
    L.ID = ID;
    return L;
  }

  static SourceLocation getMacroLoc(unsigned ID) {
    assert((ID & MacroIDBit) == 0 && "Ran out of source locations!");
    SourceLocation L;
    L.ID = MacroIDBit | ID;
    return L;
  }
public:

  /// getFileLocWithOffset - Return a source location with the specified offset
  /// from this file SourceLocation.
  SourceLocation getFileLocWithOffset(int Offset) const {
    assert(((getOffset()+Offset) & MacroIDBit) == 0 && "invalid location");
    SourceLocation L;
    L.ID = ID+Offset;
    return L;
  }

  /// getRawEncoding - When a SourceLocation itself cannot be used, this returns
  /// an (opaque) 32-bit integer encoding for it.  This should only be passed
  /// to SourceLocation::getFromRawEncoding, it should not be inspected
  /// directly.
  unsigned getRawEncoding() const { return ID; }


  /// getFromRawEncoding - Turn a raw encoding of a SourceLocation object into
  /// a real SourceLocation.
  static SourceLocation getFromRawEncoding(unsigned Encoding) {
    SourceLocation X;
    X.ID = Encoding;
    return X;
  }

  void print(llvm::raw_ostream &OS, const SourceManager &SM) const;
  void dump(const SourceManager &SM) const;
};

inline bool operator==(const SourceLocation &LHS, const SourceLocation &RHS) {
  return LHS.getRawEncoding() == RHS.getRawEncoding();
}

inline bool operator!=(const SourceLocation &LHS, const SourceLocation &RHS) {
  return !(LHS == RHS);
}

inline bool operator<(const SourceLocation &LHS, const SourceLocation &RHS) {
  return LHS.getRawEncoding() < RHS.getRawEncoding();
}

/// SourceRange - a trival tuple used to represent a source range.
class SourceRange {
  SourceLocation B;
  SourceLocation E;
public:
  SourceRange(): B(SourceLocation()), E(SourceLocation()) {}
  SourceRange(SourceLocation loc) : B(loc), E(loc) {}
  SourceRange(SourceLocation begin, SourceLocation end) : B(begin), E(end) {}

  SourceLocation getBegin() const { return B; }
  SourceLocation getEnd() const { return E; }

  void setBegin(SourceLocation b) { B = b; }
  void setEnd(SourceLocation e) { E = e; }

  bool isValid() const { return B.isValid() && E.isValid(); }
  bool isInvalid() const { return !isValid(); }

  bool operator==(const SourceRange &X) const {
    return B == X.B && E == X.E;
  }

  bool operator!=(const SourceRange &X) const {
    return B != X.B || E != X.E;
  }
};
  
/// CharSourceRange - This class represents a character granular source range.
/// The underlying SourceRange can either specify the starting/ending character
/// of the range, or it can specify the start or the range and the start of the
/// last token of the range (a "token range").  In the token range case, the
/// size of the last token must be measured to determine the actual end of the
/// range.
class CharSourceRange { 
  SourceRange Range;
  bool IsTokenRange;
public:
  CharSourceRange() : IsTokenRange(false) {}
  CharSourceRange(SourceRange R, bool ITR) : Range(R),IsTokenRange(ITR){}

  static CharSourceRange getTokenRange(SourceRange R) {
    CharSourceRange Result;
    Result.Range = R;
    Result.IsTokenRange = true;
    return Result;
  }

  static CharSourceRange getCharRange(SourceRange R) {
    CharSourceRange Result;
    Result.Range = R;
    Result.IsTokenRange = false;
    return Result;
  }
    
  static CharSourceRange getTokenRange(SourceLocation B, SourceLocation E) {
    return getTokenRange(SourceRange(B, E));
  }
  static CharSourceRange getCharRange(SourceLocation B, SourceLocation E) {
    return getCharRange(SourceRange(B, E));
  }
  
  /// isTokenRange - Return true if the end of this range specifies the start of
  /// the last token.  Return false if the end of this range specifies the last
  /// character in the range.
  bool isTokenRange() const { return IsTokenRange; }
  
  SourceLocation getBegin() const { return Range.getBegin(); }
  SourceLocation getEnd() const { return Range.getEnd(); }
  const SourceRange &getAsRange() const { return Range; }
 
  void setBegin(SourceLocation b) { Range.setBegin(b); }
  void setEnd(SourceLocation e) { Range.setEnd(e); }
  
  bool isValid() const { return Range.isValid(); }
  bool isInvalid() const { return !isValid(); }
};

/// FullSourceLoc - A SourceLocation and its associated SourceManager.  Useful
/// for argument passing to functions that expect both objects.
class FullSourceLoc :