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 //===----------------------------------------------------------------------===//
11 /// \brief Defines the clang::SourceLocation class and associated facilities.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CLANG_SOURCELOCATION_H
16 #define LLVM_CLANG_SOURCELOCATION_H
18 #include "clang/Basic/LLVM.h"
19 #include "llvm/Support/PointerLikeTypeTraits.h"
20 #include "llvm/Support/Compiler.h"
27 template <typename T> struct DenseMapInfo;
28 template <typename T> struct isPodLike;
35 /// \brief An opaque identifier used by SourceManager which refers to a
36 /// source file (MemoryBuffer) along with its \#include path and \#line data.
39 /// \brief A mostly-opaque identifier, where 0 is "invalid", >0 is
40 /// this module, and <-1 is something loaded from another module.
45 bool isInvalid() const { return ID == 0; }
47 bool operator==(const FileID &RHS) const { return ID == RHS.ID; }
48 bool operator<(const FileID &RHS) const { return ID < RHS.ID; }
49 bool operator<=(const FileID &RHS) const { return ID <= RHS.ID; }
50 bool operator!=(const FileID &RHS) const { return !(*this == RHS); }
51 bool operator>(const FileID &RHS) const { return RHS < *this; }
52 bool operator>=(const FileID &RHS) const { return RHS <= *this; }
54 static FileID getSentinel() { return get(-1); }
55 unsigned getHashValue() const { return static_cast<unsigned>(ID); }
58 friend class SourceManager;
59 friend class ASTWriter;
60 friend class ASTReader;
62 static FileID get(int V) {
67 int getOpaqueValue() const { return ID; }
71 /// \brief Encodes a location in the source. The SourceManager can decode this
72 /// to get at the full include stack, line and column information.
74 /// Technically, a source location is simply an offset into the manager's view
75 /// of the input source, which is all input buffers (including macro
76 /// expansions) concatenated in an effectively arbitrary order. The manager
77 /// actually maintains two blocks of input buffers. One, starting at offset
78 /// 0 and growing upwards, contains all buffers from this module. The other,
79 /// starting at the highest possible offset and growing downwards, contains
80 /// buffers of loaded modules.
82 /// In addition, one bit of SourceLocation is used for quick access to the
83 /// information whether the location is in a file or a macro expansion.
85 /// It is important that this type remains small. It is currently 32 bits wide.
86 class SourceLocation {
88 friend class SourceManager;
89 friend class ASTReader;
90 friend class ASTWriter;
96 SourceLocation() : ID(0) {}
98 bool isFileID() const { return (ID & MacroIDBit) == 0; }
99 bool isMacroID() const { return (ID & MacroIDBit) != 0; }
101 /// \brief Return true if this is a valid SourceLocation object.
103 /// Invalid SourceLocations are often used when events have no corresponding
104 /// location in the source (e.g. a diagnostic is required for a command line
106 bool isValid() const { return ID != 0; }
107 bool isInvalid() const { return ID == 0; }
110 /// \brief Return the offset into the manager's global input view.
111 unsigned getOffset() const {
112 return ID & ~MacroIDBit;
115 static SourceLocation getFileLoc(unsigned ID) {
116 assert((ID & MacroIDBit) == 0 && "Ran out of source locations!");
122 static SourceLocation getMacroLoc(unsigned ID) {
123 assert((ID & MacroIDBit) == 0 && "Ran out of source locations!");
125 L.ID = MacroIDBit | ID;
130 /// \brief Return a source location with the specified offset from this
132 SourceLocation getLocWithOffset(int Offset) const {
133 assert(((getOffset()+Offset) & MacroIDBit) == 0 && "offset overflow");
139 /// \brief When a SourceLocation itself cannot be used, this returns
140 /// an (opaque) 32-bit integer encoding for it.
142 /// This should only be passed to SourceLocation::getFromRawEncoding, it
143 /// should not be inspected directly.
144 unsigned getRawEncoding() const { return ID; }
146 /// \brief Turn a raw encoding of a SourceLocation object into
147 /// a real SourceLocation.
149 /// \see getRawEncoding.
150 static SourceLocation getFromRawEncoding(unsigned Encoding) {
156 /// \brief When a SourceLocation itself cannot be used, this returns
157 /// an (opaque) pointer encoding for it.
159 /// This should only be passed to SourceLocation::getFromPtrEncoding, it
160 /// should not be inspected directly.
161 void* getPtrEncoding() const {
162 // Double cast to avoid a warning "cast to pointer from integer of different
164 return (void*)(uintptr_t)getRawEncoding();
167 /// getFromPtrEncoding - Turn a pointer encoding of a SourceLocation object
168 /// into a real SourceLocation.
169 static SourceLocation getFromPtrEncoding(const void *Encoding) {
170 return getFromRawEncoding((unsigned)(uintptr_t)Encoding);
173 void print(raw_ostream &OS, const SourceManager &SM) const;
174 LLVM_ATTRIBUTE_USED std::string printToString(const SourceManager &SM) const;
175 void dump(const SourceManager &SM) const;
178 inline bool operator==(const SourceLocation &LHS, const SourceLocation &RHS) {
179 return LHS.getRawEncoding() == RHS.getRawEncoding();
182 inline bool operator!=(const SourceLocation &LHS, const SourceLocation &RHS) {
183 return !(LHS == RHS);
186 inline bool operator<(const SourceLocation &LHS, const SourceLocation &RHS) {
187 return LHS.getRawEncoding() < RHS.getRawEncoding();
190 /// \brief A trival tuple used to represent a source range.
195 SourceRange(): B(SourceLocation()), E(SourceLocation()) {}
196 SourceRange(SourceLocation loc) : B(loc), E(loc) {}
197 SourceRange(SourceLocation begin, SourceLocation end) : B(begin), E(end) {}
199 SourceLocation getBegin() const { return B; }
200 SourceLocation getEnd() const { return E; }
202 void setBegin(SourceLocation b) { B = b; }
203 void setEnd(SourceLocation e) { E = e; }
205 bool isValid() const { return B.isValid() && E.isValid(); }
206 bool isInvalid() const { return !isValid(); }
208 bool operator==(const SourceRange &X) const {
209 return B == X.B && E == X.E;
212 bool operator!=(const SourceRange &X) const {
213 return B != X.B || E != X.E;
217 /// \brief Represents a character-granular source range.
219 /// The underlying SourceRange can either specify the starting/ending character
220 /// of the range, or it can specify the start or the range and the start of the
221 /// last token of the range (a "token range"). In the token range case, the
222 /// size of the last token must be measured to determine the actual end of the
224 class CharSourceRange {
228 CharSourceRange() : IsTokenRange(false) {}
229 CharSourceRange(SourceRange R, bool ITR) : Range(R),IsTokenRange(ITR){}
231 static CharSourceRange getTokenRange(SourceRange R) {
232 CharSourceRange Result;
234 Result.IsTokenRange = true;
238 static CharSourceRange getCharRange(SourceRange R) {
239 CharSourceRange Result;
241 Result.IsTokenRange = false;
245 static CharSourceRange getTokenRange(SourceLocation B, SourceLocation E) {
246 return getTokenRange(SourceRange(B, E));
248 static CharSourceRange getCharRange(SourceLocation B, SourceLocation E) {
249 return getCharRange(SourceRange(B, E));
252 /// \brief Return true if the end of this range specifies the start of
253 /// the last token. Return false if the end of this range specifies the last
254 /// character in the range.
255 bool isTokenRange() const { return IsTokenRange; }
256 bool isCharRange() const { return !IsTokenRange; }
258 SourceLocation getBegin() const { return Range.getBegin(); }
259 SourceLocation getEnd() const { return Range.getEnd(); }
260 const SourceRange &getAsRange() const { return Range; }
262 void setBegin(SourceLocation b) { Range.setBegin(b); }
263 void setEnd(SourceLocation e) { Range.setEnd(e); }
265 bool isValid() const { return Range.isValid(); }
266 bool isInvalid() const { return !isValid(); }
269 /// \brief A SourceLocation and its associated SourceManager.
271 /// This is useful for argument passing to functions that expect both objects.
272 class FullSourceLoc : public SourceLocation {
273 const SourceManager *SrcMgr;
275 /// \brief Creates a FullSourceLoc where isValid() returns \c false.
276 explicit FullSourceLoc() : SrcMgr(0) {}
278 explicit FullSourceLoc(SourceLocation Loc, const SourceManager &SM)
279 : SourceLocation(Loc), SrcMgr(&SM) {}
281 /// \pre This FullSourceLoc has an associated SourceManager.
282 const SourceManager &getManager() const {
283 assert(SrcMgr && "SourceManager is NULL.");
287 FileID getFileID() const;
289 FullSourceLoc getExpansionLoc() const;
290 FullSourceLoc getSpellingLoc() const;
292 unsigned getExpansionLineNumber(bool *Invalid = 0) const;
293 unsigned getExpansionColumnNumber(bool *Invalid = 0) const;
295 unsigned getSpellingLineNumber(bool *Invalid = 0) const;
296 unsigned getSpellingColumnNumber(bool *Invalid = 0) const;
298 const char *getCharacterData(bool *Invalid = 0) const;
300 const llvm::MemoryBuffer* getBuffer(bool *Invalid = 0) const;
302 /// \brief Return a StringRef to the source buffer data for the
303 /// specified FileID.
304 StringRef getBufferData(bool *Invalid = 0) const;
306 /// \brief Decompose the specified location into a raw FileID + Offset pair.
308 /// The first element is the FileID, the second is the offset from the
309 /// start of the buffer of the location.
310 std::pair<FileID, unsigned> getDecomposedLoc() const;
312 bool isInSystemHeader() const;
314 /// \brief Determines the order of 2 source locations in the translation unit.
316 /// \returns true if this source location comes before 'Loc', false otherwise.
317 bool isBeforeInTranslationUnitThan(SourceLocation Loc) const;
319 /// \brief Determines the order of 2 source locations in the translation unit.
321 /// \returns true if this source location comes before 'Loc', false otherwise.
322 bool isBeforeInTranslationUnitThan(FullSourceLoc Loc) const {
323 assert(Loc.isValid());
324 assert(SrcMgr == Loc.SrcMgr && "Loc comes from another SourceManager!");
325 return isBeforeInTranslationUnitThan((SourceLocation)Loc);
328 /// \brief Comparison function class, useful for sorting FullSourceLocs.
329 struct BeforeThanCompare : public std::binary_function<FullSourceLoc,
330 FullSourceLoc, bool> {
331 bool operator()(const FullSourceLoc& lhs, const FullSourceLoc& rhs) const {
332 return lhs.isBeforeInTranslationUnitThan(rhs);
336 /// \brief Prints information about this FullSourceLoc to stderr.
338 /// This is useful for debugging.
339 LLVM_ATTRIBUTE_USED void dump() const;
342 operator==(const FullSourceLoc &LHS, const FullSourceLoc &RHS) {
343 return LHS.getRawEncoding() == RHS.getRawEncoding() &&
344 LHS.SrcMgr == RHS.SrcMgr;
348 operator!=(const FullSourceLoc &LHS, const FullSourceLoc &RHS) {
349 return !(LHS == RHS);
354 /// \brief Represents an unpacked "presumed" location which can be presented
357 /// A 'presumed' location can be modified by \#line and GNU line marker
358 /// directives and is always the expansion point of a normal location.
360 /// You can get a PresumedLoc from a SourceLocation with SourceManager.
362 const char *Filename;
364 SourceLocation IncludeLoc;
366 PresumedLoc() : Filename(0) {}
367 PresumedLoc(const char *FN, unsigned Ln, unsigned Co, SourceLocation IL)
368 : Filename(FN), Line(Ln), Col(Co), IncludeLoc(IL) {
371 /// \brief Return true if this object is invalid or uninitialized.
373 /// This occurs when created with invalid source locations or when walking
374 /// off the top of a \#include stack.
375 bool isInvalid() const { return Filename == 0; }
376 bool isValid() const { return Filename != 0; }
378 /// \brief Return the presumed filename of this location.
380 /// This can be affected by \#line etc.
381 const char *getFilename() const { return Filename; }
383 /// \brief Return the presumed line number of this location.
385 /// This can be affected by \#line etc.
386 unsigned getLine() const { return Line; }
388 /// \brief Return the presumed column number of this location.
390 /// This cannot be affected by \#line, but is packaged here for convenience.
391 unsigned getColumn() const { return Col; }
393 /// \brief Return the presumed include location of this location.
395 /// This can be affected by GNU linemarker directives.
396 SourceLocation getIncludeLoc() const { return IncludeLoc; }
400 } // end namespace clang
403 /// Define DenseMapInfo so that FileID's can be used as keys in DenseMap and
406 struct DenseMapInfo<clang::FileID> {
407 static inline clang::FileID getEmptyKey() {
408 return clang::FileID();
410 static inline clang::FileID getTombstoneKey() {
411 return clang::FileID::getSentinel();
414 static unsigned getHashValue(clang::FileID S) {
415 return S.getHashValue();
418 static bool isEqual(clang::FileID LHS, clang::FileID RHS) {
424 struct isPodLike<clang::SourceLocation> { static const bool value = true; };
426 struct isPodLike<clang::FileID> { static const bool value = true; };
428 // Teach SmallPtrSet how to handle SourceLocation.
430 class PointerLikeTypeTraits<clang::SourceLocation> {
432 static inline void *getAsVoidPointer(clang::SourceLocation L) {
433 return L.getPtrEncoding();
435 static inline clang::SourceLocation getFromVoidPointer(void *P) {
436 return clang::SourceLocation::getFromRawEncoding((unsigned)(uintptr_t)P);
438 enum { NumLowBitsAvailable = 0 };
441 } // end namespace llvm