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//===--- SourceLocation.h - Compact identifier for Source Files -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and 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
namespace clang {
/// 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;
public:
enum {
FileIDBits = 14,
FilePosBits = 32-FileIDBits
};
SourceLocation() : ID(0) {} // 0 is an invalid FileID.
/// SourceLocation constructor - Create a new SourceLocation object with the
/// specified FileID and FilePos.
SourceLocation(unsigned FileID, unsigned FilePos) {
// If a FilePos is larger than (1<<FilePosBits), the SourceManager makes
// enough consequtive FileIDs that we have one for each chunk.
if (FilePos >= (1 << FilePosBits)) {
FileID += FilePos >> FilePosBits;
FilePos &= (1 << FilePosBits)-1;
}
// FIXME: Find a way to handle out of FileID bits! Maybe MaxFileID is an
// escape of some sort?
if (FileID >= (1 << FileIDBits))
FileID = (1 << FileIDBits)-1;
ID = (FileID << FilePosBits) | FilePos;
}
/// 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; }
/// getFileID - Return the file identifier for this SourceLocation. This
/// FileID can be used with the SourceManager object to obtain an entire
/// include stack for a file position reference.
unsigned getFileID() const { return ID >> FilePosBits; }
/// getRawFilePos - Return the byte offset from the start of the file-chunk
/// referred to by FileID. This method should not be used to get the offset
/// from the start of the file, instead you should use
/// SourceManager::getFilePos. This method will be incorrect for large files.
unsigned getRawFilePos() const { return ID & ((1 << FilePosBits)-1); }
/// 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;
}
};
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);
}
/// 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 Begin() const { return B; }
SourceLocation End() const { return E; }
bool isValid() const { return B.isValid() && E.isValid(); }
};
} // end namespace clang
#endif
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