1 //===--- SourceLocation.h - Compact identifier for Source Files -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the SourceLocation class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_SOURCELOCATION_H
15 #define LLVM_CLANG_SOURCELOCATION_H
17 #include "clang/Basic/LLVM.h"
18 #include "llvm/Support/PointerLikeTypeTraits.h"
25 template <typename T> struct DenseMapInfo;
26 template <typename T> struct isPodLike;
33 /// FileID - This is an opaque identifier used by SourceManager which refers to
34 /// a source file (MemoryBuffer) along with its #include path and #line data.
37 /// ID - Opaque identifier, 0 is "invalid". >0 is this module, <-1 is
38 /// something loaded from another module.
43 bool isInvalid() const { return ID == 0; }
45 bool operator==(const FileID &RHS) const { return ID == RHS.ID; }
46 bool operator<(const FileID &RHS) const { return ID < RHS.ID; }
47 bool operator<=(const FileID &RHS) const { return ID <= RHS.ID; }
48 bool operator!=(const FileID &RHS) const { return !(*this == RHS); }
49 bool operator>(const FileID &RHS) const { return RHS < *this; }
50 bool operator>=(const FileID &RHS) const { return RHS <= *this; }
52 static FileID getSentinel() { return get(-1); }
53 unsigned getHashValue() const { return static_cast<unsigned>(ID); }
56 friend class SourceManager;
57 friend class ASTWriter;
58 friend class ASTReader;
60 static FileID get(int V) {
65 int getOpaqueValue() const { return ID; }
69 /// \brief Encodes a location in the source. The SourceManager can decode this
70 /// to get at the full include stack, line and column information.
72 /// Technically, a source location is simply an offset into the manager's view
73 /// of the input source, which is all input buffers (including macro
74 /// instantiations) concatenated in an effectively arbitrary order. The manager
75 /// actually maintains two blocks of input buffers. One, starting at offset 0
76 /// and growing upwards, contains all buffers from this module. The other,
77 /// starting at the highest possible offset and growing downwards, contains
78 /// buffers of loaded modules.
80 /// In addition, one bit of SourceLocation is used for quick access to the
81 /// information whether the location is in a file or a macro instantiation.
83 /// It is important that this type remains small. It is currently 32 bits wide.
84 class SourceLocation {
86 friend class SourceManager;
92 SourceLocation() : ID(0) {}
94 bool isFileID() const { return (ID & MacroIDBit) == 0; }
95 bool isMacroID() const { return (ID & MacroIDBit) != 0; }
97 /// \brief Return true if this is a valid SourceLocation object.
99 /// Invalid SourceLocations are often used when events have no corresponding
100 /// location in the source (e.g. a diagnostic is required for a command line
102 bool isValid() const { return ID != 0; }
103 bool isInvalid() const { return ID == 0; }
106 /// \brief Return the offset into the manager's global input view.
107 unsigned getOffset() const {
108 return ID & ~MacroIDBit;
111 static SourceLocation getFileLoc(unsigned ID) {
112 assert((ID & MacroIDBit) == 0 && "Ran out of source locations!");
118 static SourceLocation getMacroLoc(unsigned ID) {
119 assert((ID & MacroIDBit) == 0 && "Ran out of source locations!");
121 L.ID = MacroIDBit | ID;
126 /// getFileLocWithOffset - Return a source location with the specified offset
127 /// from this file SourceLocation.
128 SourceLocation getFileLocWithOffset(int Offset) const {
129 assert(((getOffset()+Offset) & MacroIDBit) == 0 &&
130 "offset overflow or macro loc");
136 /// getRawEncoding - When a SourceLocation itself cannot be used, this returns
137 /// an (opaque) 32-bit integer encoding for it. This should only be passed
138 /// to SourceLocation::getFromRawEncoding, it should not be inspected
140 unsigned getRawEncoding() const { return ID; }
142 /// getFromRawEncoding - Turn a raw encoding of a SourceLocation object into
143 /// a real SourceLocation.
144 static SourceLocation getFromRawEncoding(unsigned Encoding) {
150 /// getPtrEncoding - When a SourceLocation itself cannot be used, this returns
151 /// an (opaque) pointer encoding for it. This should only be passed
152 /// to SourceLocation::getFromPtrEncoding, it should not be inspected
154 void* getPtrEncoding() const {
155 // Double cast to avoid a warning "cast to pointer from integer of different
157 return (void*)(uintptr_t)getRawEncoding();
160 /// getFromPtrEncoding - Turn a pointer encoding of a SourceLocation object
161 /// into a real SourceLocation.
162 static SourceLocation getFromPtrEncoding(void *Encoding) {
163 return getFromRawEncoding((unsigned)(uintptr_t)Encoding);
166 void print(raw_ostream &OS, const SourceManager &SM) const;
167 void dump(const SourceManager &SM) const;
170 inline bool operator==(const SourceLocation &LHS, const SourceLocation &RHS) {
171 return LHS.getRawEncoding() == RHS.getRawEncoding();
174 inline bool operator!=(const SourceLocation &LHS, const SourceLocation &RHS) {
175 return !(LHS == RHS);
178 inline bool operator<(const SourceLocation &LHS, const SourceLocation &RHS) {
179 return LHS.getRawEncoding() < RHS.getRawEncoding();
182 /// SourceRange - a trival tuple used to represent a source range.
187 SourceRange(): B(SourceLocation()), E(SourceLocation()) {}
188 SourceRange(SourceLocation loc) : B(loc), E(loc) {}
189 SourceRange(SourceLocation begin, SourceLocation end) : B(begin), E(end) {}
191 SourceLocation getBegin() const { return B; }
192 SourceLocation getEnd() const { return E; }
194 void setBegin(SourceLocation b) { B = b; }
195 void setEnd(SourceLocation e) { E = e; }
197 bool isValid() const { return B.isValid() && E.isValid(); }
198 bool isInvalid() const { return !isValid(); }
200 bool operator==(const SourceRange &X) const {
201 return B == X.B && E == X.E;
204 bool operator!=(const SourceRange &X) const {
205 return B != X.B || E != X.E;
209 /// CharSourceRange - This class represents a character granular source range.
210 /// The underlying SourceRange can either specify the starting/ending character
211 /// of the range, or it can specify the start or the range and the start of the
212 /// last token of the range (a "token range"). In the token range case, the
213 /// size of the last token must be measured to determine the actual end of the
215 class CharSourceRange {
219 CharSourceRange() : IsTokenRange(false) {}
220 CharSourceRange(SourceRange R, bool ITR) : Range(R),IsTokenRange(ITR){}
222 static CharSourceRange getTokenRange(SourceRange R) {
223 CharSourceRange Result;
225 Result.IsTokenRange = true;
229 static CharSourceRange getCharRange(SourceRange R) {
230 CharSourceRange Result;
232 Result.IsTokenRange = false;
236 static CharSourceRange getTokenRange(SourceLocation B, SourceLocation E) {
237 return getTokenRange(SourceRange(B, E));
239 static CharSourceRange getCharRange(SourceLocation B, SourceLocation E) {
240 return getCharRange(SourceRange(B, E));
243 /// isTokenRange - Return true if the end of this range specifies the start of
244 /// the last token. Return false if the end of this range specifies the last
245 /// character in the range.
246 bool isTokenRange() const { return IsTokenRange; }
248 SourceLocation getBegin() const { return Range.getBegin(); }
249 SourceLocation getEnd() const { return Range.getEnd(); }
250 const SourceRange &getAsRange() const { return Range; }
252 void setBegin(SourceLocation b) { Range.setBegin(b); }
253 void setEnd(SourceLocation e) { Range.setEnd(e); }
255 bool isValid() const { return Range.isValid(); }
256 bool isInvalid() const { return !isValid(); }
259 /// FullSourceLoc - A SourceLocation and its associated SourceManager. Useful
260 /// for argument passing to functions that expect both objects.
261 class FullSourceLoc : public SourceLocation {
262 const SourceManager *SrcMgr;
264 /// Creates a FullSourceLoc where isValid() returns false.
265 explicit FullSourceLoc() : SrcMgr(0) {}
267 explicit FullSourceLoc(SourceLocation Loc, const SourceManager &SM)
268 : SourceLocation(Loc), SrcMgr(&SM) {}
270 const SourceManager &getManager() const {
271 assert(SrcMgr && "SourceManager is NULL.");
275 FileID getFileID() const;
277 FullSourceLoc getInstantiationLoc() const;
278 FullSourceLoc getSpellingLoc() const;
280 unsigned getInstantiationLineNumber(bool *Invalid = 0) const;
281 unsigned getInstantiationColumnNumber(bool *Invalid = 0) const;
283 unsigned getSpellingLineNumber(bool *Invalid = 0) const;
284 unsigned getSpellingColumnNumber(bool *Invalid = 0) const;
286 const char *getCharacterData(bool *Invalid = 0) const;
288 const llvm::MemoryBuffer* getBuffer(bool *Invalid = 0) const;
290 /// getBufferData - Return a StringRef to the source buffer data for the
291 /// specified FileID.
292 StringRef getBufferData(bool *Invalid = 0) const;
294 /// getDecomposedLoc - Decompose the specified location into a raw FileID +
295 /// Offset pair. The first element is the FileID, the second is the
296 /// offset from the start of the buffer of the location.
297 std::pair<FileID, unsigned> getDecomposedLoc() const;
299 bool isInSystemHeader() const;
301 /// \brief Determines the order of 2 source locations in the translation unit.
303 /// \returns true if this source location comes before 'Loc', false otherwise.
304 bool isBeforeInTranslationUnitThan(SourceLocation Loc) const;
306 /// \brief Determines the order of 2 source locations in the translation unit.
308 /// \returns true if this source location comes before 'Loc', false otherwise.
309 bool isBeforeInTranslationUnitThan(FullSourceLoc Loc) const {
310 assert(Loc.isValid());
311 assert(SrcMgr == Loc.SrcMgr && "Loc comes from another SourceManager!");
312 return isBeforeInTranslationUnitThan((SourceLocation)Loc);
315 /// \brief Comparison function class, useful for sorting FullSourceLocs.
316 struct BeforeThanCompare : public std::binary_function<FullSourceLoc,
317 FullSourceLoc, bool> {
318 bool operator()(const FullSourceLoc& lhs, const FullSourceLoc& rhs) const {
319 return lhs.isBeforeInTranslationUnitThan(rhs);
323 /// Prints information about this FullSourceLoc to stderr. Useful for
325 void dump() const { SourceLocation::dump(*SrcMgr); }
328 operator==(const FullSourceLoc &LHS, const FullSourceLoc &RHS) {
329 return LHS.getRawEncoding() == RHS.getRawEncoding() &&
330 LHS.SrcMgr == RHS.SrcMgr;
334 operator!=(const FullSourceLoc &LHS, const FullSourceLoc &RHS) {
335 return !(LHS == RHS);
340 /// PresumedLoc - This class represents an unpacked "presumed" location which
341 /// can be presented to the user. A 'presumed' location can be modified by
342 /// #line and GNU line marker directives and is always the instantiation point
343 /// of a normal location.
345 /// You can get a PresumedLoc from a SourceLocation with SourceManager.
347 const char *Filename;
349 SourceLocation IncludeLoc;
351 PresumedLoc() : Filename(0) {}
352 PresumedLoc(const char *FN, unsigned Ln, unsigned Co, SourceLocation IL)
353 : Filename(FN), Line(Ln), Col(Co), IncludeLoc(IL) {
356 /// isInvalid - Return true if this object is invalid or uninitialized. This
357 /// occurs when created with invalid source locations or when walking off
358 /// the top of a #include stack.
359 bool isInvalid() const { return Filename == 0; }
360 bool isValid() const { return Filename != 0; }
362 /// getFilename - Return the presumed filename of this location. This can be
363 /// affected by #line etc.
364 const char *getFilename() const { return Filename; }
366 /// getLine - Return the presumed line number of this location. This can be
367 /// affected by #line etc.
368 unsigned getLine() const { return Line; }
370 /// getColumn - Return the presumed column number of this location. This can
371 /// not be affected by #line, but is packaged here for convenience.
372 unsigned getColumn() const { return Col; }
374 /// getIncludeLoc - Return the presumed include location of this location.
375 /// This can be affected by GNU linemarker directives.
376 SourceLocation getIncludeLoc() const { return IncludeLoc; }
380 } // end namespace clang
383 /// Define DenseMapInfo so that FileID's can be used as keys in DenseMap and
386 struct DenseMapInfo<clang::FileID> {
387 static inline clang::FileID getEmptyKey() {
388 return clang::FileID();
390 static inline clang::FileID getTombstoneKey() {
391 return clang::FileID::getSentinel();
394 static unsigned getHashValue(clang::FileID S) {
395 return S.getHashValue();
398 static bool isEqual(clang::FileID LHS, clang::FileID RHS) {
404 struct isPodLike<clang::SourceLocation> { static const bool value = true; };
406 struct isPodLike<clang::FileID> { static const bool value = true; };
408 // Teach SmallPtrSet how to handle SourceLocation.
410 class PointerLikeTypeTraits<clang::SourceLocation> {
412 static inline void *getAsVoidPointer(clang::SourceLocation L) {
413 return L.getPtrEncoding();
415 static inline clang::SourceLocation getFromVoidPointer(void *P) {
416 return clang::SourceLocation::getFromRawEncoding((unsigned)(uintptr_t)P);
418 enum { NumLowBitsAvailable = 0 };
421 } // end namespace llvm