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 /// Defines the clang::SourceLocation class and associated facilities.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CLANG_BASIC_SOURCELOCATION_H
16 #define LLVM_CLANG_BASIC_SOURCELOCATION_H
18 #include "clang/Basic/LLVM.h"
19 #include "llvm/ADT/StringRef.h"
20 #include "llvm/Support/PointerLikeTypeTraits.h"
28 template <typename T> struct DenseMapInfo;
29 template <typename T> struct isPodLike;
37 /// An opaque identifier used by SourceManager which refers to a
38 /// source file (MemoryBuffer) along with its \#include path and \#line data.
41 /// A mostly-opaque identifier, where 0 is "invalid", >0 is
42 /// this module, and <-1 is something loaded from another module.
46 bool isValid() const { return ID != 0; }
47 bool isInvalid() const { return ID == 0; }
49 bool operator==(const FileID &RHS) const { return ID == RHS.ID; }
50 bool operator<(const FileID &RHS) const { return ID < RHS.ID; }
51 bool operator<=(const FileID &RHS) const { return ID <= RHS.ID; }
52 bool operator!=(const FileID &RHS) const { return !(*this == RHS); }
53 bool operator>(const FileID &RHS) const { return RHS < *this; }
54 bool operator>=(const FileID &RHS) const { return RHS <= *this; }
56 static FileID getSentinel() { return get(-1); }
57 unsigned getHashValue() const { return static_cast<unsigned>(ID); }
60 friend class ASTWriter;
61 friend class ASTReader;
62 friend class SourceManager;
64 static FileID get(int V) {
70 int getOpaqueValue() const { return ID; }
73 /// Encodes a location in the source. The SourceManager can decode this
74 /// to get at the full include stack, line and column information.
76 /// Technically, a source location is simply an offset into the manager's view
77 /// of the input source, which is all input buffers (including macro
78 /// expansions) concatenated in an effectively arbitrary order. The manager
79 /// actually maintains two blocks of input buffers. One, starting at offset
80 /// 0 and growing upwards, contains all buffers from this module. The other,
81 /// starting at the highest possible offset and growing downwards, contains
82 /// buffers of loaded modules.
84 /// In addition, one bit of SourceLocation is used for quick access to the
85 /// information whether the location is in a file or a macro expansion.
87 /// It is important that this type remains small. It is currently 32 bits wide.
88 class SourceLocation {
89 friend class ASTReader;
90 friend class ASTWriter;
91 friend class SourceManager;
100 bool isFileID() const { return (ID & MacroIDBit) == 0; }
101 bool isMacroID() const { return (ID & MacroIDBit) != 0; }
103 /// Return true if this is a valid SourceLocation object.
105 /// Invalid SourceLocations are often used when events have no corresponding
106 /// location in the source (e.g. a diagnostic is required for a command line
108 bool isValid() const { return ID != 0; }
109 bool isInvalid() const { return ID == 0; }
112 /// Return the offset into the manager's global input view.
113 unsigned getOffset() const {
114 return ID & ~MacroIDBit;
117 static SourceLocation getFileLoc(unsigned ID) {
118 assert((ID & MacroIDBit) == 0 && "Ran out of source locations!");
124 static SourceLocation getMacroLoc(unsigned ID) {
125 assert((ID & MacroIDBit) == 0 && "Ran out of source locations!");
127 L.ID = MacroIDBit | ID;
132 /// Return a source location with the specified offset from this
134 SourceLocation getLocWithOffset(int Offset) const {
135 assert(((getOffset()+Offset) & MacroIDBit) == 0 && "offset overflow");
141 /// When a SourceLocation itself cannot be used, this returns
142 /// an (opaque) 32-bit integer encoding for it.
144 /// This should only be passed to SourceLocation::getFromRawEncoding, it
145 /// should not be inspected directly.
146 unsigned getRawEncoding() const { return ID; }
148 /// Turn a raw encoding of a SourceLocation object into
149 /// a real SourceLocation.
151 /// \see getRawEncoding.
152 static SourceLocation getFromRawEncoding(unsigned Encoding) {
158 /// When a SourceLocation itself cannot be used, this returns
159 /// an (opaque) pointer encoding for it.
161 /// This should only be passed to SourceLocation::getFromPtrEncoding, it
162 /// should not be inspected directly.
163 void* getPtrEncoding() const {
164 // Double cast to avoid a warning "cast to pointer from integer of different
166 return (void*)(uintptr_t)getRawEncoding();
169 /// Turn a pointer encoding of a SourceLocation object back
170 /// into a real SourceLocation.
171 static SourceLocation getFromPtrEncoding(const void *Encoding) {
172 return getFromRawEncoding((unsigned)(uintptr_t)Encoding);
175 static bool isPairOfFileLocations(SourceLocation Start, SourceLocation End) {
176 return Start.isValid() && Start.isFileID() && End.isValid() &&
180 void print(raw_ostream &OS, const SourceManager &SM) const;
181 std::string printToString(const SourceManager &SM) const;
182 void dump(const SourceManager &SM) const;
185 inline bool operator==(const SourceLocation &LHS, const SourceLocation &RHS) {
186 return LHS.getRawEncoding() == RHS.getRawEncoding();
189 inline bool operator!=(const SourceLocation &LHS, const SourceLocation &RHS) {
190 return !(LHS == RHS);
193 inline bool operator<(const SourceLocation &LHS, const SourceLocation &RHS) {
194 return LHS.getRawEncoding() < RHS.getRawEncoding();
197 /// A trivial tuple used to represent a source range.
203 SourceRange() = default;
204 SourceRange(SourceLocation loc) : B(loc), E(loc) {}
205 SourceRange(SourceLocation begin, SourceLocation end) : B(begin), E(end) {}
207 SourceLocation getBegin() const { return B; }
208 SourceLocation getEnd() const { return E; }
210 void setBegin(SourceLocation b) { B = b; }
211 void setEnd(SourceLocation e) { E = e; }
213 bool isValid() const { return B.isValid() && E.isValid(); }
214 bool isInvalid() const { return !isValid(); }
216 bool operator==(const SourceRange &X) const {
217 return B == X.B && E == X.E;
220 bool operator!=(const SourceRange &X) const {
221 return B != X.B || E != X.E;
225 /// Represents a character-granular source range.
227 /// The underlying SourceRange can either specify the starting/ending character
228 /// of the range, or it can specify the start of the range and the start of the
229 /// last token of the range (a "token range"). In the token range case, the
230 /// size of the last token must be measured to determine the actual end of the
232 class CharSourceRange {
234 bool IsTokenRange = false;
237 CharSourceRange() = default;
238 CharSourceRange(SourceRange R, bool ITR) : Range(R), IsTokenRange(ITR) {}
240 static CharSourceRange getTokenRange(SourceRange R) {
241 return CharSourceRange(R, true);
244 static CharSourceRange getCharRange(SourceRange R) {
245 return CharSourceRange(R, false);
248 static CharSourceRange getTokenRange(SourceLocation B, SourceLocation E) {
249 return getTokenRange(SourceRange(B, E));
252 static CharSourceRange getCharRange(SourceLocation B, SourceLocation E) {
253 return getCharRange(SourceRange(B, E));
256 /// Return true if the end of this range specifies the start of
257 /// the last token. Return false if the end of this range specifies the last
258 /// character in the range.
259 bool isTokenRange() const { return IsTokenRange; }
260 bool isCharRange() const { return !IsTokenRange; }
262 SourceLocation getBegin() const { return Range.getBegin(); }
263 SourceLocation getEnd() const { return Range.getEnd(); }
264 SourceRange getAsRange() const { return Range; }
266 void setBegin(SourceLocation b) { Range.setBegin(b); }
267 void setEnd(SourceLocation e) { Range.setEnd(e); }
268 void setTokenRange(bool TR) { IsTokenRange = TR; }
270 bool isValid() const { return Range.isValid(); }
271 bool isInvalid() const { return !isValid(); }
274 /// Represents an unpacked "presumed" location which can be presented
277 /// A 'presumed' location can be modified by \#line and GNU line marker
278 /// directives and is always the expansion point of a normal location.
280 /// You can get a PresumedLoc from a SourceLocation with SourceManager.
282 const char *Filename = nullptr;
284 SourceLocation IncludeLoc;
287 PresumedLoc() = default;
288 PresumedLoc(const char *FN, unsigned Ln, unsigned Co, SourceLocation IL)
289 : Filename(FN), Line(Ln), Col(Co), IncludeLoc(IL) {}
291 /// Return true if this object is invalid or uninitialized.
293 /// This occurs when created with invalid source locations or when walking
294 /// off the top of a \#include stack.
295 bool isInvalid() const { return Filename == nullptr; }
296 bool isValid() const { return Filename != nullptr; }
298 /// Return the presumed filename of this location.
300 /// This can be affected by \#line etc.
301 const char *getFilename() const {
306 /// Return the presumed line number of this location.
308 /// This can be affected by \#line etc.
309 unsigned getLine() const {
314 /// Return the presumed column number of this location.
316 /// This cannot be affected by \#line, but is packaged here for convenience.
317 unsigned getColumn() const {
322 /// Return the presumed include location of this location.
324 /// This can be affected by GNU linemarker directives.
325 SourceLocation getIncludeLoc() const {
333 /// A SourceLocation and its associated SourceManager.
335 /// This is useful for argument passing to functions that expect both objects.
336 class FullSourceLoc : public SourceLocation {
337 const SourceManager *SrcMgr = nullptr;
340 /// Creates a FullSourceLoc where isValid() returns \c false.
341 FullSourceLoc() = default;
343 explicit FullSourceLoc(SourceLocation Loc, const SourceManager &SM)
344 : SourceLocation(Loc), SrcMgr(&SM) {}
346 bool hasManager() const {
347 bool hasSrcMgr = SrcMgr != nullptr;
348 assert(hasSrcMgr == isValid() && "FullSourceLoc has location but no manager");
352 /// \pre This FullSourceLoc has an associated SourceManager.
353 const SourceManager &getManager() const {
354 assert(SrcMgr && "SourceManager is NULL.");
358 FileID getFileID() const;
360 FullSourceLoc getExpansionLoc() const;
361 FullSourceLoc getSpellingLoc() const;
362 FullSourceLoc getFileLoc() const;
363 PresumedLoc getPresumedLoc(bool UseLineDirectives = true) const;
364 bool isMacroArgExpansion(FullSourceLoc *StartLoc = nullptr) const;
365 FullSourceLoc getImmediateMacroCallerLoc() const;
366 std::pair<FullSourceLoc, StringRef> getModuleImportLoc() const;
367 unsigned getFileOffset() const;
369 unsigned getExpansionLineNumber(bool *Invalid = nullptr) const;
370 unsigned getExpansionColumnNumber(bool *Invalid = nullptr) const;
372 unsigned getSpellingLineNumber(bool *Invalid = nullptr) const;
373 unsigned getSpellingColumnNumber(bool *Invalid = nullptr) const;
375 const char *getCharacterData(bool *Invalid = nullptr) const;
377 unsigned getLineNumber(bool *Invalid = nullptr) const;
378 unsigned getColumnNumber(bool *Invalid = nullptr) const;
380 const FileEntry *getFileEntry() const;
382 /// Return a StringRef to the source buffer data for the
383 /// specified FileID.
384 StringRef getBufferData(bool *Invalid = nullptr) const;
386 /// Decompose the specified location into a raw FileID + Offset pair.
388 /// The first element is the FileID, the second is the offset from the
389 /// start of the buffer of the location.
390 std::pair<FileID, unsigned> getDecomposedLoc() const;
392 bool isInSystemHeader() const;
394 /// Determines the order of 2 source locations in the translation unit.
396 /// \returns true if this source location comes before 'Loc', false otherwise.
397 bool isBeforeInTranslationUnitThan(SourceLocation Loc) const;
399 /// Determines the order of 2 source locations in the translation unit.
401 /// \returns true if this source location comes before 'Loc', false otherwise.
402 bool isBeforeInTranslationUnitThan(FullSourceLoc Loc) const {
403 assert(Loc.isValid());
404 assert(SrcMgr == Loc.SrcMgr && "Loc comes from another SourceManager!");
405 return isBeforeInTranslationUnitThan((SourceLocation)Loc);
408 /// Comparison function class, useful for sorting FullSourceLocs.
409 struct BeforeThanCompare {
410 bool operator()(const FullSourceLoc& lhs, const FullSourceLoc& rhs) const {
411 return lhs.isBeforeInTranslationUnitThan(rhs);
415 /// Prints information about this FullSourceLoc to stderr.
417 /// This is useful for debugging.
421 operator==(const FullSourceLoc &LHS, const FullSourceLoc &RHS) {
422 return LHS.getRawEncoding() == RHS.getRawEncoding() &&
423 LHS.SrcMgr == RHS.SrcMgr;
427 operator!=(const FullSourceLoc &LHS, const FullSourceLoc &RHS) {
428 return !(LHS == RHS);
436 /// Define DenseMapInfo so that FileID's can be used as keys in DenseMap and
439 struct DenseMapInfo<clang::FileID> {
440 static clang::FileID getEmptyKey() {
444 static clang::FileID getTombstoneKey() {
445 return clang::FileID::getSentinel();
448 static unsigned getHashValue(clang::FileID S) {
449 return S.getHashValue();
452 static bool isEqual(clang::FileID LHS, clang::FileID RHS) {
458 struct isPodLike<clang::SourceLocation> { static const bool value = true; };
460 struct isPodLike<clang::FileID> { static const bool value = true; };
462 // Teach SmallPtrSet how to handle SourceLocation.
464 struct PointerLikeTypeTraits<clang::SourceLocation> {
465 enum { NumLowBitsAvailable = 0 };
467 static void *getAsVoidPointer(clang::SourceLocation L) {
468 return L.getPtrEncoding();
471 static clang::SourceLocation getFromVoidPointer(void *P) {
472 return clang::SourceLocation::getFromRawEncoding((unsigned)(uintptr_t)P);
478 #endif // LLVM_CLANG_BASIC_SOURCELOCATION_H