1//===- SourceManager.h - Track and cache source files -----------*- C++ -*-===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10/// \file
11/// Defines the SourceManager interface.
12///
13/// There are three different types of locations in a %file: a spelling
14/// location, an expansion location, and a presumed location.
15///
16/// Given an example of:
17/// \code
18/// #define min(x, y) x < y ? x : y
19/// \endcode
20///
21/// and then later on a use of min:
22/// \code
23/// #line 17
24/// return min(a, b);
25/// \endcode
26///
27/// The expansion location is the line in the source code where the macro
28/// was expanded (the return statement), the spelling location is the
29/// location in the source where the macro was originally defined,
30/// and the presumed location is where the line directive states that
31/// the line is 17, or any other line.
32//
33//===----------------------------------------------------------------------===//
34
35#ifndef LLVM_CLANG_BASIC_SOURCEMANAGER_H
36#define LLVM_CLANG_BASIC_SOURCEMANAGER_H
37
38#include "clang/Basic/Diagnostic.h"
39#include "clang/Basic/FileManager.h"
40#include "clang/Basic/SourceLocation.h"
41#include "llvm/ADT/ArrayRef.h"
42#include "llvm/ADT/BitVector.h"
43#include "llvm/ADT/DenseMap.h"
44#include "llvm/ADT/DenseSet.h"
45#include "llvm/ADT/IntrusiveRefCntPtr.h"
46#include "llvm/ADT/PointerIntPair.h"
47#include "llvm/ADT/SmallVector.h"
48#include "llvm/ADT/StringRef.h"
49#include "llvm/Support/Allocator.h"
50#include "llvm/Support/Compiler.h"
51#include "llvm/Support/MemoryBuffer.h"
52#include <cassert>
53#include <cstddef>
54#include <map>
55#include <memory>
56#include <string>
57#include <utility>
58#include <vector>
59
60namespace clang {
61
62class ASTReader;
63class ASTWriter;
64class LineTableInfo;
65class SourceManager;
66
67/// Public enums and private classes that are part of the
68/// SourceManager implementation.
69namespace SrcMgr {
70
71 /// Indicates whether a file or directory holds normal user code,
72 /// system code, or system code which is implicitly 'extern "C"' in C++ mode.
73 ///
74 /// Entire directories can be tagged with this (this is maintained by
75 /// DirectoryLookup and friends) as can specific FileInfos when a \#pragma
76 /// system_header is seen or in various other cases.
77 ///
78 enum CharacteristicKind {
79 C_User, C_System, C_ExternCSystem, C_User_ModuleMap, C_System_ModuleMap
80 };
81
82 /// Determine whether a file / directory characteristic is for system code.
83 inline bool isSystem(CharacteristicKind CK) {
84 return CK != C_User && CK != C_User_ModuleMap;
85 }
86
87 /// Determine whether a file characteristic is for a module map.
88 inline bool isModuleMap(CharacteristicKind CK) {
89 return CK == C_User_ModuleMap || CK == C_System_ModuleMap;
90 }
91
92 /// One instance of this struct is kept for every file loaded or used.
93 ///
94 /// This object owns the MemoryBuffer object.
95 class LLVM_ALIGNAS(8) ContentCache {
96 enum CCFlags {
97 /// Whether the buffer is invalid.
98 InvalidFlag = 0x01,
99
100 /// Whether the buffer should not be freed on destruction.
101 DoNotFreeFlag = 0x02
102 };
103
104 /// The actual buffer containing the characters from the input
105 /// file.
106 ///
107 /// This is owned by the ContentCache object. The bits indicate
108 /// whether the buffer is invalid.
109 mutable llvm::PointerIntPair<llvm::MemoryBuffer *, 2> Buffer;
110
111 public:
112 /// Reference to the file entry representing this ContentCache.
113 ///
114 /// This reference does not own the FileEntry object.
115 ///
116 /// It is possible for this to be NULL if the ContentCache encapsulates
117 /// an imaginary text buffer.
118 const FileEntry *OrigEntry;
119
120 /// References the file which the contents were actually loaded from.
121 ///
122 /// Can be different from 'Entry' if we overridden the contents of one file
123 /// with the contents of another file.
124 const FileEntry *ContentsEntry;
125
126 /// A bump pointer allocated array of offsets for each source line.
127 ///
128 /// This is lazily computed. This is owned by the SourceManager
129 /// BumpPointerAllocator object.
130 unsigned *SourceLineCache = nullptr;
131
132 /// The number of lines in this ContentCache.
133 ///
134 /// This is only valid if SourceLineCache is non-null.
135 unsigned NumLines = 0;
136
137 /// Indicates whether the buffer itself was provided to override
138 /// the actual file contents.
139 ///
140 /// When true, the original entry may be a virtual file that does not
141 /// exist.
142 unsigned BufferOverridden : 1;
143
144 /// True if this content cache was initially created for a source
145 /// file considered as a system one.
146 unsigned IsSystemFile : 1;
147
148 /// True if this file may be transient, that is, if it might not
149 /// exist at some later point in time when this content entry is used,
150 /// after serialization and deserialization.
151 unsigned IsTransient : 1;
152
153 ContentCache(const FileEntry *Ent = nullptr) : ContentCache(Ent, Ent) {}
154
155 ContentCache(const FileEntry *Ent, const FileEntry *contentEnt)
156 : Buffer(nullptr, false), OrigEntry(Ent), ContentsEntry(contentEnt),
157 BufferOverridden(false), IsSystemFile(false), IsTransient(false) {}
158
159 /// The copy ctor does not allow copies where source object has either
160 /// a non-NULL Buffer or SourceLineCache. Ownership of allocated memory
161 /// is not transferred, so this is a logical error.
162 ContentCache(const ContentCache &RHS)
163 : Buffer(nullptr, false), BufferOverridden(false), IsSystemFile(false),
164 IsTransient(false) {
165 OrigEntry = RHS.OrigEntry;
166 ContentsEntry = RHS.ContentsEntry;
167
168 assert(RHS.Buffer.getPointer() == nullptr &&
169 RHS.SourceLineCache == nullptr &&
170 "Passed ContentCache object cannot own a buffer.");
171
172 NumLines = RHS.NumLines;
173 }
174
175 ContentCache &operator=(const ContentCache& RHS) = delete;
176
177 ~ContentCache();
178
179 /// Returns the memory buffer for the associated content.
180 ///
181 /// \param Diag Object through which diagnostics will be emitted if the
182 /// buffer cannot be retrieved.
183 ///
184 /// \param Loc If specified, is the location that invalid file diagnostics
185 /// will be emitted at.
186 ///
187 /// \param Invalid If non-NULL, will be set \c true if an error occurred.
188 llvm::MemoryBuffer *getBuffer(DiagnosticsEngine &Diag,
189 const SourceManager &SM,
190 SourceLocation Loc = SourceLocation(),
191 bool *Invalid = nullptr) const;
192
193 /// Returns the size of the content encapsulated by this
194 /// ContentCache.
195 ///
196 /// This can be the size of the source file or the size of an
197 /// arbitrary scratch buffer. If the ContentCache encapsulates a source
198 /// file this size is retrieved from the file's FileEntry.
199 unsigned getSize() const;
200
201 /// Returns the number of bytes actually mapped for this
202 /// ContentCache.
203 ///
204 /// This can be 0 if the MemBuffer was not actually expanded.
205 unsigned getSizeBytesMapped() const;
206
207 /// Returns the kind of memory used to back the memory buffer for
208 /// this content cache. This is used for performance analysis.
209 llvm::MemoryBuffer::BufferKind getMemoryBufferKind() const;
210
211 /// Get the underlying buffer, returning NULL if the buffer is not
212 /// yet available.
213 llvm::MemoryBuffer *getRawBuffer() const { return Buffer.getPointer(); }
214
215 /// Replace the existing buffer (which will be deleted)
216 /// with the given buffer.
217 void replaceBuffer(llvm::MemoryBuffer *B, bool DoNotFree = false);
218
219 /// Determine whether the buffer itself is invalid.
220 bool isBufferInvalid() const {
221 return Buffer.getInt() & InvalidFlag;
222 }
223
224 /// Determine whether the buffer should be freed.
225 bool shouldFreeBuffer() const {
226 return (Buffer.getInt() & DoNotFreeFlag) == 0;
227 }
228 };
229
230 // Assert that the \c ContentCache objects will always be 8-byte aligned so
231 // that we can pack 3 bits of integer into pointers to such objects.
232 static_assert(alignof(ContentCache) >= 8,
233 "ContentCache must be 8-byte aligned.");
234
235 /// Information about a FileID, basically just the logical file
236 /// that it represents and include stack information.
237 ///
238 /// Each FileInfo has include stack information, indicating where it came
239 /// from. This information encodes the \#include chain that a token was
240 /// expanded from. The main include file has an invalid IncludeLoc.
241 ///
242 /// FileInfos contain a "ContentCache *", with the contents of the file.
243 ///
244 class FileInfo {
245 friend class clang::SourceManager;
246 friend class clang::ASTWriter;
247 friend class clang::ASTReader;
248
249 /// The location of the \#include that brought in this file.
250 ///
251 /// This is an invalid SLOC for the main file (top of the \#include chain).
252 unsigned IncludeLoc; // Really a SourceLocation
253
254 /// Number of FileIDs (files and macros) that were created during
255 /// preprocessing of this \#include, including this SLocEntry.
256 ///
257 /// Zero means the preprocessor didn't provide such info for this SLocEntry.
258 unsigned NumCreatedFIDs : 31;
259
260 /// Whether this FileInfo has any \#line directives.
261 unsigned HasLineDirectives : 1;
262
263 /// The content cache and the characteristic of the file.
264 llvm::PointerIntPair<const ContentCache*, 3, CharacteristicKind>
265 ContentAndKind;
266
267 public:
268 /// Return a FileInfo object.
269 static FileInfo get(SourceLocation IL, const ContentCache *Con,
270 CharacteristicKind FileCharacter) {
271 FileInfo X;
272 X.IncludeLoc = IL.getRawEncoding();
273 X.NumCreatedFIDs = 0;
274 X.HasLineDirectives = false;
275 X.ContentAndKind.setPointer(Con);
276 X.ContentAndKind.setInt(FileCharacter);
277 return X;
278 }
279
280 SourceLocation getIncludeLoc() const {
281 return SourceLocation::getFromRawEncoding(IncludeLoc);
282 }
283
284 const ContentCache *getContentCache() const {
285 return ContentAndKind.getPointer();
286 }
287
288 /// Return whether this is a system header or not.
289 CharacteristicKind getFileCharacteristic() const {
290 return ContentAndKind.getInt();
291 }
292
293 /// Return true if this FileID has \#line directives in it.
294 bool hasLineDirectives() const { return HasLineDirectives; }
295
296 /// Set the flag that indicates that this FileID has
297 /// line table entries associated with it.
298 void setHasLineDirectives() {
299 HasLineDirectives = true;
300 }
301 };
302
303 /// Each ExpansionInfo encodes the expansion location - where
304 /// the token was ultimately expanded, and the SpellingLoc - where the actual
305 /// character data for the token came from.
306 class ExpansionInfo {
307 // Really these are all SourceLocations.
308
309 /// Where the spelling for the token can be found.
310 unsigned SpellingLoc;
311
312 /// In a macro expansion, ExpansionLocStart and ExpansionLocEnd
313 /// indicate the start and end of the expansion. In object-like macros,
314 /// they will be the same. In a function-like macro expansion, the start
315 /// will be the identifier and the end will be the ')'. Finally, in
316 /// macro-argument instantiations, the end will be 'SourceLocation()', an
317 /// invalid location.
318 unsigned ExpansionLocStart, ExpansionLocEnd;
319
320 /// Whether the expansion range is a token range.
321 bool ExpansionIsTokenRange;
322
323 public:
324 SourceLocation getSpellingLoc() const {
325 SourceLocation SpellLoc = SourceLocation::getFromRawEncoding(SpellingLoc);
326 return SpellLoc.isInvalid() ? getExpansionLocStart() : SpellLoc;
327 }
328
329 SourceLocation getExpansionLocStart() const {
330 return SourceLocation::getFromRawEncoding(ExpansionLocStart);
331 }
332
333 SourceLocation getExpansionLocEnd() const {
334 SourceLocation EndLoc =
335 SourceLocation::getFromRawEncoding(ExpansionLocEnd);
336 return EndLoc.isInvalid() ? getExpansionLocStart() : EndLoc;
337 }
338
339 bool isExpansionTokenRange() const {
340 return ExpansionIsTokenRange;
341 }
342
343 CharSourceRange getExpansionLocRange() const {
344 return CharSourceRange(
345 SourceRange(getExpansionLocStart(), getExpansionLocEnd()),
346 isExpansionTokenRange());
347 }
348
349 bool isMacroArgExpansion() const {
350 // Note that this needs to return false for default constructed objects.
351 return getExpansionLocStart().isValid() &&
352 SourceLocation::getFromRawEncoding(ExpansionLocEnd).isInvalid();
353 }
354
355 bool isMacroBodyExpansion() const {
356 return getExpansionLocStart().isValid() &&
357 SourceLocation::getFromRawEncoding(ExpansionLocEnd).isValid();
358 }
359
360 bool isFunctionMacroExpansion() const {
361 return getExpansionLocStart().isValid() &&
362 getExpansionLocStart() != getExpansionLocEnd();
363 }
364
365 /// Return a ExpansionInfo for an expansion.
366 ///
367 /// Start and End specify the expansion range (where the macro is
368 /// expanded), and SpellingLoc specifies the spelling location (where
369 /// the characters from the token come from). All three can refer to
370 /// normal File SLocs or expansion locations.
371 static ExpansionInfo create(SourceLocation SpellingLoc,
372 SourceLocation Start, SourceLocation End,
373 bool ExpansionIsTokenRange = true) {
374 ExpansionInfo X;
375 X.SpellingLoc = SpellingLoc.getRawEncoding();
376 X.ExpansionLocStart = Start.getRawEncoding();
377 X.ExpansionLocEnd = End.getRawEncoding();
378 X.ExpansionIsTokenRange = ExpansionIsTokenRange;
379 return X;
380 }
381
382 /// Return a special ExpansionInfo for the expansion of
383 /// a macro argument into a function-like macro's body.
384 ///
385 /// ExpansionLoc specifies the expansion location (where the macro is
386 /// expanded). This doesn't need to be a range because a macro is always
387 /// expanded at a macro parameter reference, and macro parameters are
388 /// always exactly one token. SpellingLoc specifies the spelling location
389 /// (where the characters from the token come from). ExpansionLoc and
390 /// SpellingLoc can both refer to normal File SLocs or expansion locations.
391 ///
392 /// Given the code:
393 /// \code
394 /// #define F(x) f(x)
395 /// F(42);
396 /// \endcode
397 ///
398 /// When expanding '\c F(42)', the '\c x' would call this with an
399 /// SpellingLoc pointing at '\c 42' and an ExpansionLoc pointing at its
400 /// location in the definition of '\c F'.
401 static ExpansionInfo createForMacroArg(SourceLocation SpellingLoc,
402 SourceLocation ExpansionLoc) {
403 // We store an intentionally invalid source location for the end of the
404 // expansion range to mark that this is a macro argument location rather
405 // than a normal one.
406 return create(SpellingLoc, ExpansionLoc, SourceLocation());
407 }
408
409 /// Return a special ExpansionInfo representing a token that ends
410 /// prematurely. This is used to model a '>>' token that has been split
411 /// into '>' tokens and similar cases. Unlike for the other forms of
412 /// expansion, the expansion range in this case is a character range, not
413 /// a token range.
414 static ExpansionInfo createForTokenSplit(SourceLocation SpellingLoc,
415 SourceLocation Start,
416 SourceLocation End) {
417 return create(SpellingLoc, Start, End, false);
418 }
419 };
420
421 /// This is a discriminated union of FileInfo and ExpansionInfo.
422 ///
423 /// SourceManager keeps an array of these objects, and they are uniquely
424 /// identified by the FileID datatype.
425 class SLocEntry {
426 unsigned Offset : 31;
427 unsigned IsExpansion : 1;
428 union {
429 FileInfo File;
430 ExpansionInfo Expansion;
431 };
432
433 public:
434 SLocEntry() : Offset(), IsExpansion(), File() {}
435
436 unsigned getOffset() const { return Offset; }
437
438 bool isExpansion() const { return IsExpansion; }
439 bool isFile() const { return !isExpansion(); }
440
441 const FileInfo &getFile() const {
442 assert(isFile() && "Not a file SLocEntry!");
443 return File;
444 }
445
446 const ExpansionInfo &getExpansion() const {
447 assert(isExpansion() && "Not a macro expansion SLocEntry!");
448 return Expansion;
449 }
450
451 static SLocEntry get(unsigned Offset, const FileInfo &FI) {
452 assert(!(Offset & (1 << 31)) && "Offset is too large");
453 SLocEntry E;
454 E.Offset = Offset;
455 E.IsExpansion = false;
456 E.File = FI;
457 return E;
458 }
459
460 static SLocEntry get(unsigned Offset, const ExpansionInfo &Expansion) {
461 assert(!(Offset & (1 << 31)) && "Offset is too large");
462 SLocEntry E;
463 E.Offset = Offset;
464 E.IsExpansion = true;
465 E.Expansion = Expansion;
466 return E;
467 }
468 };
469
470} // namespace SrcMgr
471
472/// External source of source location entries.
473class ExternalSLocEntrySource {
474public:
475 virtual ~ExternalSLocEntrySource();
476
477 /// Read the source location entry with index ID, which will always be
478 /// less than -1.
479 ///
480 /// \returns true if an error occurred that prevented the source-location
481 /// entry from being loaded.
482 virtual bool ReadSLocEntry(int ID) = 0;
483
484 /// Retrieve the module import location and name for the given ID, if
485 /// in fact it was loaded from a module (rather than, say, a precompiled
486 /// header).
487 virtual std::pair<SourceLocation, StringRef> getModuleImportLoc(int ID) = 0;
488};
489
490/// Holds the cache used by isBeforeInTranslationUnit.
491///
492/// The cache structure is complex enough to be worth breaking out of
493/// SourceManager.
494class InBeforeInTUCacheEntry {
495 /// The FileID's of the cached query.
496 ///
497 /// If these match up with a subsequent query, the result can be reused.
498 FileID LQueryFID, RQueryFID;
499
500 /// True if LQueryFID was created before RQueryFID.
501 ///
502 /// This is used to compare macro expansion locations.
503 bool IsLQFIDBeforeRQFID;
504
505 /// The file found in common between the two \#include traces, i.e.,
506 /// the nearest common ancestor of the \#include tree.
507 FileID CommonFID;
508
509 /// The offset of the previous query in CommonFID.
510 ///
511 /// Usually, this represents the location of the \#include for QueryFID, but
512 /// if LQueryFID is a parent of RQueryFID (or vice versa) then these can be a
513 /// random token in the parent.
514 unsigned LCommonOffset, RCommonOffset;
515
516public:
517 /// Return true if the currently cached values match up with
518 /// the specified LHS/RHS query.
519 ///
520 /// If not, we can't use the cache.
521 bool isCacheValid(FileID LHS, FileID RHS) const {
522 return LQueryFID == LHS && RQueryFID == RHS;
523 }
524
525 /// If the cache is valid, compute the result given the
526 /// specified offsets in the LHS/RHS FileID's.
527 bool getCachedResult(unsigned LOffset, unsigned ROffset) const {
528 // If one of the query files is the common file, use the offset. Otherwise,
529 // use the #include loc in the common file.
530 if (LQueryFID != CommonFID) LOffset = LCommonOffset;
531 if (RQueryFID != CommonFID) ROffset = RCommonOffset;
532
533 // It is common for multiple macro expansions to be "included" from the same
534 // location (expansion location), in which case use the order of the FileIDs
535 // to determine which came first. This will also take care the case where
536 // one of the locations points at the inclusion/expansion point of the other
537 // in which case its FileID will come before the other.
538 if (LOffset == ROffset)
539 return IsLQFIDBeforeRQFID;
540
541 return LOffset < ROffset;
542 }
543
544 /// Set up a new query.
545 void setQueryFIDs(FileID LHS, FileID RHS, bool isLFIDBeforeRFID) {
546 assert(LHS != RHS);
547 LQueryFID = LHS;
548 RQueryFID = RHS;
549 IsLQFIDBeforeRQFID = isLFIDBeforeRFID;
550 }
551
552 void clear() {
553 LQueryFID = RQueryFID = FileID();
554 IsLQFIDBeforeRQFID = false;
555 }
556
557 void setCommonLoc(FileID commonFID, unsigned lCommonOffset,
558 unsigned rCommonOffset) {
559 CommonFID = commonFID;
560 LCommonOffset = lCommonOffset;
561 RCommonOffset = rCommonOffset;
562 }
563};
564
565/// The stack used when building modules on demand, which is used
566/// to provide a link between the source managers of the different compiler
567/// instances.
568using ModuleBuildStack = ArrayRef<std::pair<std::string, FullSourceLoc>>;
569
570/// This class handles loading and caching of source files into memory.
571///
572/// This object owns the MemoryBuffer objects for all of the loaded
573/// files and assigns unique FileID's for each unique \#include chain.
574///
575/// The SourceManager can be queried for information about SourceLocation
576/// objects, turning them into either spelling or expansion locations. Spelling
577/// locations represent where the bytes corresponding to a token came from and
578/// expansion locations represent where the location is in the user's view. In
579/// the case of a macro expansion, for example, the spelling location indicates
580/// where the expanded token came from and the expansion location specifies
581/// where it was expanded.
582class SourceManager : public RefCountedBase<SourceManager> {
583 /// DiagnosticsEngine object.
584 DiagnosticsEngine &Diag;
585
586 FileManager &FileMgr;
587
588 mutable llvm::BumpPtrAllocator ContentCacheAlloc;
589
590 /// Memoized information about all of the files tracked by this
591 /// SourceManager.
592 ///
593 /// This map allows us to merge ContentCache entries based
594 /// on their FileEntry*. All ContentCache objects will thus have unique,
595 /// non-null, FileEntry pointers.
596 llvm::DenseMap<const FileEntry*, SrcMgr::ContentCache*> FileInfos;
597
598 /// True if the ContentCache for files that are overridden by other
599 /// files, should report the original file name. Defaults to true.
600 bool OverridenFilesKeepOriginalName = true;
601
602 /// True if non-system source files should be treated as volatile
603 /// (likely to change while trying to use them). Defaults to false.
604 bool UserFilesAreVolatile;
605
606 /// True if all files read during this compilation should be treated
607 /// as transient (may not be present in later compilations using a module
608 /// file created from this compilation). Defaults to false.
609 bool FilesAreTransient = false;
610
611 struct OverriddenFilesInfoTy {
612 /// Files that have been overridden with the contents from another
613 /// file.
614 llvm::DenseMap<const FileEntry *, const FileEntry *> OverriddenFiles;
615
616 /// Files that were overridden with a memory buffer.
617 llvm::DenseSet<const FileEntry *> OverriddenFilesWithBuffer;
618 };
619
620 /// Lazily create the object keeping overridden files info, since
621 /// it is uncommonly used.
622 std::unique_ptr<OverriddenFilesInfoTy> OverriddenFilesInfo;
623
624 OverriddenFilesInfoTy &getOverriddenFilesInfo() {
625 if (!OverriddenFilesInfo)
626 OverriddenFilesInfo.reset(new OverriddenFilesInfoTy);
627 return *OverriddenFilesInfo;
628 }
629
630 /// Information about various memory buffers that we have read in.
631 ///
632 /// All FileEntry* within the stored ContentCache objects are NULL,
633 /// as they do not refer to a file.
634 std::vector<SrcMgr::ContentCache*> MemBufferInfos;
635
636 /// The table of SLocEntries that are local to this module.
637 ///
638 /// Positive FileIDs are indexes into this table. Entry 0 indicates an invalid
639 /// expansion.
640 SmallVector<SrcMgr::SLocEntry, 0> LocalSLocEntryTable;
641
642 /// The table of SLocEntries that are loaded from other modules.
643 ///
644 /// Negative FileIDs are indexes into this table. To get from ID to an index,
645 /// use (-ID - 2).
646 mutable SmallVector<SrcMgr::SLocEntry, 0> LoadedSLocEntryTable;
647
648 /// The starting offset of the next local SLocEntry.
649 ///
650 /// This is LocalSLocEntryTable.back().Offset + the size of that entry.
651 unsigned NextLocalOffset;
652
653 /// The starting offset of the latest batch of loaded SLocEntries.
654 ///
655 /// This is LoadedSLocEntryTable.back().Offset, except that that entry might
656 /// not have been loaded, so that value would be unknown.
657 unsigned CurrentLoadedOffset;
658
659 /// The highest possible offset is 2^31-1, so CurrentLoadedOffset
660 /// starts at 2^31.
661 static const unsigned MaxLoadedOffset = 1U << 31U;
662
663 /// A bitmap that indicates whether the entries of LoadedSLocEntryTable
664 /// have already been loaded from the external source.
665 ///
666 /// Same indexing as LoadedSLocEntryTable.
667 llvm::BitVector SLocEntryLoaded;
668
669 /// An external source for source location entries.
670 ExternalSLocEntrySource *ExternalSLocEntries = nullptr;
671
672 /// A one-entry cache to speed up getFileID.
673 ///
674 /// LastFileIDLookup records the last FileID looked up or created, because it
675 /// is very common to look up many tokens from the same file.
676 mutable FileID LastFileIDLookup;
677
678 /// Holds information for \#line directives.
679 ///
680 /// This is referenced by indices from SLocEntryTable.
681 LineTableInfo *LineTable = nullptr;
682
683 /// These ivars serve as a cache used in the getLineNumber
684 /// method which is used to speedup getLineNumber calls to nearby locations.
685 mutable FileID LastLineNoFileIDQuery;
686 mutable SrcMgr::ContentCache *LastLineNoContentCache;
687 mutable unsigned LastLineNoFilePos;
688 mutable unsigned LastLineNoResult;
689
690 /// The file ID for the main source file of the translation unit.
691 FileID MainFileID;
692
693 /// The file ID for the precompiled preamble there is one.
694 FileID PreambleFileID;
695
696 // Statistics for -print-stats.
697 mutable unsigned NumLinearScans = 0;
698 mutable unsigned NumBinaryProbes = 0;
699
700 /// Associates a FileID with its "included/expanded in" decomposed
701 /// location.
702 ///
703 /// Used to cache results from and speed-up \c getDecomposedIncludedLoc
704 /// function.
705 mutable llvm::DenseMap<FileID, std::pair<FileID, unsigned>> IncludedLocMap;
706
707 /// The key value into the IsBeforeInTUCache table.
708 using IsBeforeInTUCacheKey = std::pair<FileID, FileID>;
709
710 /// The IsBeforeInTranslationUnitCache is a mapping from FileID pairs
711 /// to cache results.
712 using InBeforeInTUCache =
713 llvm::DenseMap<IsBeforeInTUCacheKey, InBeforeInTUCacheEntry>;
714
715 /// Cache results for the isBeforeInTranslationUnit method.
716 mutable InBeforeInTUCache IBTUCache;
717 mutable InBeforeInTUCacheEntry IBTUCacheOverflow;
718
719 /// Return the cache entry for comparing the given file IDs
720 /// for isBeforeInTranslationUnit.
721 InBeforeInTUCacheEntry &getInBeforeInTUCache(FileID LFID, FileID RFID) const;
722
723 // Cache for the "fake" buffer used for error-recovery purposes.
724 mutable std::unique_ptr<llvm::MemoryBuffer> FakeBufferForRecovery;
725
726 mutable std::unique_ptr<SrcMgr::ContentCache> FakeContentCacheForRecovery;
727
728 /// Lazily computed map of macro argument chunks to their expanded
729 /// source location.
730 using MacroArgsMap = std::map<unsigned, SourceLocation>;
731
732 mutable llvm::DenseMap<FileID, std::unique_ptr<MacroArgsMap>>
733 MacroArgsCacheMap;
734
735 /// The stack of modules being built, which is used to detect
736 /// cycles in the module dependency graph as modules are being built, as
737 /// well as to describe why we're rebuilding a particular module.
738 ///
739 /// There is no way to set this value from the command line. If we ever need
740 /// to do so (e.g., if on-demand module construction moves out-of-process),
741 /// we can add a cc1-level option to do so.
742 SmallVector<std::pair<std::string, FullSourceLoc>, 2> StoredModuleBuildStack;
743
744public:
745 SourceManager(DiagnosticsEngine &Diag, FileManager &FileMgr,
746 bool UserFilesAreVolatile = false);
747 explicit SourceManager(const SourceManager &) = delete;
748 SourceManager &operator=(const SourceManager &) = delete;
749 ~SourceManager();
750
751 void clearIDTables();
752
753 /// Initialize this source manager suitably to replay the compilation
754 /// described by \p Old. Requires that \p Old outlive \p *this.
755 void initializeForReplay(const SourceManager &Old);
756
757 DiagnosticsEngine &getDiagnostics() const { return Diag; }
758
759 FileManager &getFileManager() const { return FileMgr; }
760
761 /// Set true if the SourceManager should report the original file name
762 /// for contents of files that were overridden by other files. Defaults to
763 /// true.
764 void setOverridenFilesKeepOriginalName(bool value) {
765 OverridenFilesKeepOriginalName = value;
766 }
767
768 /// True if non-system source files should be treated as volatile
769 /// (likely to change while trying to use them).
770 bool userFilesAreVolatile() const { return UserFilesAreVolatile; }
771
772 /// Retrieve the module build stack.
773 ModuleBuildStack getModuleBuildStack() const {
774 return StoredModuleBuildStack;
775 }
776
777 /// Set the module build stack.
778 void setModuleBuildStack(ModuleBuildStack stack) {
779 StoredModuleBuildStack.clear();
780 StoredModuleBuildStack.append(stack.begin(), stack.end());
781 }
782
783 /// Push an entry to the module build stack.
784 void pushModuleBuildStack(StringRef moduleName, FullSourceLoc importLoc) {
785 StoredModuleBuildStack.push_back(std::make_pair(moduleName.str(),importLoc));
786 }
787
788 //===--------------------------------------------------------------------===//
789 // MainFileID creation and querying methods.
790 //===--------------------------------------------------------------------===//
791
792 /// Returns the FileID of the main source file.
793 FileID getMainFileID() const { return MainFileID; }
794
795 /// Set the file ID for the main source file.
796 void setMainFileID(FileID FID) {
797 MainFileID = FID;
798 }
799
800 /// Set the file ID for the precompiled preamble.
801 void setPreambleFileID(FileID Preamble) {
802 assert(PreambleFileID.isInvalid() && "PreambleFileID already set!");
803 PreambleFileID = Preamble;
804 }
805
806 /// Get the file ID for the precompiled preamble if there is one.
807 FileID getPreambleFileID() const { return PreambleFileID; }
808
809 //===--------------------------------------------------------------------===//
810 // Methods to create new FileID's and macro expansions.
811 //===--------------------------------------------------------------------===//
812
813 /// Create a new FileID that represents the specified file
814 /// being \#included from the specified IncludePosition.
815 ///
816 /// This translates NULL into standard input.
817 FileID createFileID(const FileEntry *SourceFile, SourceLocation IncludePos,
818 SrcMgr::CharacteristicKind FileCharacter,
819 int LoadedID = 0, unsigned LoadedOffset = 0) {
820 const SrcMgr::ContentCache *IR =
821 getOrCreateContentCache(SourceFile, isSystem(FileCharacter));
822 assert(IR && "getOrCreateContentCache() cannot return NULL");
823 return createFileID(IR, IncludePos, FileCharacter, LoadedID, LoadedOffset);
824 }
825
826 /// Create a new FileID that represents the specified memory buffer.
827 ///
828 /// This does no caching of the buffer and takes ownership of the
829 /// MemoryBuffer, so only pass a MemoryBuffer to this once.
830 FileID createFileID(std::unique_ptr<llvm::MemoryBuffer> Buffer,
831 SrcMgr::CharacteristicKind FileCharacter = SrcMgr::C_User,
832 int LoadedID = 0, unsigned LoadedOffset = 0,
833 SourceLocation IncludeLoc = SourceLocation()) {
834 return createFileID(
835 createMemBufferContentCache(Buffer.release(), /*DoNotFree*/ false),
836 IncludeLoc, FileCharacter, LoadedID, LoadedOffset);
837 }
838
839 enum UnownedTag { Unowned };
840
841 /// Create a new FileID that represents the specified memory buffer.
842 ///
843 /// This does no caching of the buffer and takes ownership of the
844 /// MemoryBuffer, so only pass a MemoryBuffer to this once.
845 FileID createFileID(UnownedTag, llvm::MemoryBuffer *Buffer,
846 SrcMgr::CharacteristicKind FileCharacter = SrcMgr::C_User,
847 int LoadedID = 0, unsigned LoadedOffset = 0,
848 SourceLocation IncludeLoc = SourceLocation()) {
849 return createFileID(createMemBufferContentCache(Buffer, /*DoNotFree*/true),
850 IncludeLoc, FileCharacter, LoadedID, LoadedOffset);
851 }
852
853 /// Get the FileID for \p SourceFile if it exists. Otherwise, create a
854 /// new FileID for the \p SourceFile.
855 FileID getOrCreateFileID(const FileEntry *SourceFile,
856 SrcMgr::CharacteristicKind FileCharacter) {
857 FileID ID = translateFile(SourceFile);
858 return ID.isValid() ? ID : createFileID(SourceFile, SourceLocation(),
859 FileCharacter);
860 }
861
862 /// Return a new SourceLocation that encodes the
863 /// fact that a token from SpellingLoc should actually be referenced from
864 /// ExpansionLoc, and that it represents the expansion of a macro argument
865 /// into the function-like macro body.
866 SourceLocation createMacroArgExpansionLoc(SourceLocation Loc,
867 SourceLocation ExpansionLoc,
868 unsigned TokLength);
869
870 /// Return a new SourceLocation that encodes the fact
871 /// that a token from SpellingLoc should actually be referenced from
872 /// ExpansionLoc.
873 SourceLocation createExpansionLoc(SourceLocation Loc,
874 SourceLocation ExpansionLocStart,
875 SourceLocation ExpansionLocEnd,
876 unsigned TokLength,
877 bool ExpansionIsTokenRange = true,
878 int LoadedID = 0,
879 unsigned LoadedOffset = 0);
880
881 /// Return a new SourceLocation that encodes that the token starting
882 /// at \p TokenStart ends prematurely at \p TokenEnd.
883 SourceLocation createTokenSplitLoc(SourceLocation SpellingLoc,
884 SourceLocation TokenStart,
885 SourceLocation TokenEnd);
886
887 /// Retrieve the memory buffer associated with the given file.
888 ///
889 /// \param Invalid If non-NULL, will be set \c true if an error
890 /// occurs while retrieving the memory buffer.
891 llvm::MemoryBuffer *getMemoryBufferForFile(const FileEntry *File,
892 bool *Invalid = nullptr);
893
894 /// Override the contents of the given source file by providing an
895 /// already-allocated buffer.
896 ///
897 /// \param SourceFile the source file whose contents will be overridden.
898 ///
899 /// \param Buffer the memory buffer whose contents will be used as the
900 /// data in the given source file.
901 ///
902 /// \param DoNotFree If true, then the buffer will not be freed when the
903 /// source manager is destroyed.
904 void overrideFileContents(const FileEntry *SourceFile,
905 llvm::MemoryBuffer *Buffer, bool DoNotFree);
906 void overrideFileContents(const FileEntry *SourceFile,
907 std::unique_ptr<llvm::MemoryBuffer> Buffer) {
908 overrideFileContents(SourceFile, Buffer.release(), /*DoNotFree*/ false);
909 }
910
911 /// Override the given source file with another one.
912 ///
913 /// \param SourceFile the source file which will be overridden.
914 ///
915 /// \param NewFile the file whose contents will be used as the
916 /// data instead of the contents of the given source file.
917 void overrideFileContents(const FileEntry *SourceFile,
918 const FileEntry *NewFile);
919
920 /// Returns true if the file contents have been overridden.
921 bool isFileOverridden(const FileEntry *File) const {
922 if (OverriddenFilesInfo) {
923 if (OverriddenFilesInfo->OverriddenFilesWithBuffer.count(File))
924 return true;
925 if (OverriddenFilesInfo->OverriddenFiles.find(File) !=
926 OverriddenFilesInfo->OverriddenFiles.end())
927 return true;
928 }
929 return false;
930 }
931
932 /// Disable overridding the contents of a file, previously enabled
933 /// with #overrideFileContents.
934 ///
935 /// This should be called before parsing has begun.
936 void disableFileContentsOverride(const FileEntry *File);
937
938 /// Specify that a file is transient.
939 void setFileIsTransient(const FileEntry *SourceFile);
940
941 /// Specify that all files that are read during this compilation are
942 /// transient.
943 void setAllFilesAreTransient(bool Transient) {
944 FilesAreTransient = Transient;
945 }
946
947 //===--------------------------------------------------------------------===//
948 // FileID manipulation methods.
949 //===--------------------------------------------------------------------===//
950
951 /// Return the buffer for the specified FileID.
952 ///
953 /// If there is an error opening this buffer the first time, this
954 /// manufactures a temporary buffer and returns a non-empty error string.
955 llvm::MemoryBuffer *getBuffer(FileID FID, SourceLocation Loc,
956 bool *Invalid = nullptr) const {
957 bool MyInvalid = false;
958 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &MyInvalid);
959 if (MyInvalid || !Entry.isFile()) {
960 if (Invalid)
961 *Invalid = true;
962
963 return getFakeBufferForRecovery();
964 }
965
966 return Entry.getFile().getContentCache()->getBuffer(Diag, *this, Loc,
967 Invalid);
968 }
969
970 llvm::MemoryBuffer *getBuffer(FileID FID, bool *Invalid = nullptr) const {
971 bool MyInvalid = false;
972 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &MyInvalid);
973 if (MyInvalid || !Entry.isFile()) {
974 if (Invalid)
975 *Invalid = true;
976
977 return getFakeBufferForRecovery();
978 }
979
980 return Entry.getFile().getContentCache()->getBuffer(Diag, *this,
981 SourceLocation(),
982 Invalid);
983 }
984
985 /// Returns the FileEntry record for the provided FileID.
986 const FileEntry *getFileEntryForID(FileID FID) const {
987 bool MyInvalid = false;
988 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &MyInvalid);
989 if (MyInvalid || !Entry.isFile())
990 return nullptr;
991
992 const SrcMgr::ContentCache *Content = Entry.getFile().getContentCache();
993 if (!Content)
994 return nullptr;
995 return Content->OrigEntry;
996 }
997
998 /// Returns the FileEntry record for the provided SLocEntry.
999 const FileEntry *getFileEntryForSLocEntry(const SrcMgr::SLocEntry &sloc) const
1000 {
1001 const SrcMgr::ContentCache *Content = sloc.getFile().getContentCache();
1002 if (!Content)
1003 return nullptr;
1004 return Content->OrigEntry;
1005 }
1006
1007 /// Return a StringRef to the source buffer data for the
1008 /// specified FileID.
1009 ///
1010 /// \param FID The file ID whose contents will be returned.
1011 /// \param Invalid If non-NULL, will be set true if an error occurred.
1012 StringRef getBufferData(FileID FID, bool *Invalid = nullptr) const;
1013
1014 /// Get the number of FileIDs (files and macros) that were created
1015 /// during preprocessing of \p FID, including it.
1016 unsigned getNumCreatedFIDsForFileID(FileID FID) const {
1017 bool Invalid = false;
1018 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &Invalid);
1019 if (Invalid || !Entry.isFile())
1020 return 0;
1021
1022 return Entry.getFile().NumCreatedFIDs;
1023 }
1024
1025 /// Set the number of FileIDs (files and macros) that were created
1026 /// during preprocessing of \p FID, including it.
1027 void setNumCreatedFIDsForFileID(FileID FID, unsigned NumFIDs) const {
1028 bool Invalid = false;
1029 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &Invalid);
1030 if (Invalid || !Entry.isFile())
1031 return;
1032
1033 assert(Entry.getFile().NumCreatedFIDs == 0 && "Already set!");
1034 const_cast<SrcMgr::FileInfo &>(Entry.getFile()).NumCreatedFIDs = NumFIDs;
1035 }
1036
1037 //===--------------------------------------------------------------------===//
1038 // SourceLocation manipulation methods.
1039 //===--------------------------------------------------------------------===//
1040
1041 /// Return the FileID for a SourceLocation.
1042 ///
1043 /// This is a very hot method that is used for all SourceManager queries
1044 /// that start with a SourceLocation object. It is responsible for finding
1045 /// the entry in SLocEntryTable which contains the specified location.
1046 ///
1047 FileID getFileID(SourceLocation SpellingLoc) const {
1048 unsigned SLocOffset = SpellingLoc.getOffset();
1049
1050 // If our one-entry cache covers this offset, just return it.
1051 if (isOffsetInFileID(LastFileIDLookup, SLocOffset))
1052 return LastFileIDLookup;
1053
1054 return getFileIDSlow(SLocOffset);
1055 }
1056
1057 /// Return the filename of the file containing a SourceLocation.
1058 StringRef getFilename(SourceLocation SpellingLoc) const {
1059 if (const FileEntry *F = getFileEntryForID(getFileID(SpellingLoc)))
1060 return F->getName();
1061 return StringRef();
1062 }
1063
1064 /// Return the source location corresponding to the first byte of
1065 /// the specified file.
1066 SourceLocation getLocForStartOfFile(FileID FID) const {
1067 bool Invalid = false;
1068 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &Invalid);
1069 if (Invalid || !Entry.isFile())
1070 return SourceLocation();
1071
1072 unsigned FileOffset = Entry.getOffset();
1073 return SourceLocation::getFileLoc(FileOffset);
1074 }
1075
1076 /// Return the source location corresponding to the last byte of the
1077 /// specified file.
1078 SourceLocation getLocForEndOfFile(FileID FID) const {
1079 bool Invalid = false;
1080 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &Invalid);
1081 if (Invalid || !Entry.isFile())
1082 return SourceLocation();
1083
1084 unsigned FileOffset = Entry.getOffset();
1085 return SourceLocation::getFileLoc(FileOffset + getFileIDSize(FID));
1086 }
1087
1088 /// Returns the include location if \p FID is a \#include'd file
1089 /// otherwise it returns an invalid location.
1090 SourceLocation getIncludeLoc(FileID FID) const {
1091 bool Invalid = false;
1092 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &Invalid);
1093 if (Invalid || !Entry.isFile())
1094 return SourceLocation();
1095
1096 return Entry.getFile().getIncludeLoc();
1097 }
1098
1099 // Returns the import location if the given source location is
1100 // located within a module, or an invalid location if the source location
1101 // is within the current translation unit.
1102 std::pair<SourceLocation, StringRef>
1103 getModuleImportLoc(SourceLocation Loc) const {
1104 FileID FID = getFileID(Loc);
1105
1106 // Positive file IDs are in the current translation unit, and -1 is a
1107 // placeholder.
1108 if (FID.ID >= -1)
1109 return std::make_pair(SourceLocation(), "");
1110
1111 return ExternalSLocEntries->getModuleImportLoc(FID.ID);
1112 }
1113
1114 /// Given a SourceLocation object \p Loc, return the expansion
1115 /// location referenced by the ID.
1116 SourceLocation getExpansionLoc(SourceLocation Loc) const {
1117 // Handle the non-mapped case inline, defer to out of line code to handle
1118 // expansions.
1119 if (Loc.isFileID()) return Loc;
1120 return getExpansionLocSlowCase(Loc);
1121 }
1122
1123 /// Given \p Loc, if it is a macro location return the expansion
1124 /// location or the spelling location, depending on if it comes from a
1125 /// macro argument or not.
1126 SourceLocation getFileLoc(SourceLocation Loc) const {
1127 if (Loc.isFileID()) return Loc;
1128 return getFileLocSlowCase(Loc);
1129 }
1130
1131 /// Return the start/end of the expansion information for an
1132 /// expansion location.
1133 ///
1134 /// \pre \p Loc is required to be an expansion location.
1135 CharSourceRange getImmediateExpansionRange(SourceLocation Loc) const;
1136
1137 /// Given a SourceLocation object, return the range of
1138 /// tokens covered by the expansion in the ultimate file.
1139 CharSourceRange getExpansionRange(SourceLocation Loc) const;
1140
1141 /// Given a SourceRange object, return the range of
1142 /// tokens or characters covered by the expansion in the ultimate file.
1143 CharSourceRange getExpansionRange(SourceRange Range) const {
1144 SourceLocation Begin = getExpansionRange(Range.getBegin()).getBegin();
1145 CharSourceRange End = getExpansionRange(Range.getEnd());
1146 return CharSourceRange(SourceRange(Begin, End.getEnd()),
1147 End.isTokenRange());
1148 }
1149
1150 /// Given a CharSourceRange object, return the range of
1151 /// tokens or characters covered by the expansion in the ultimate file.
1152 CharSourceRange getExpansionRange(CharSourceRange Range) const {
1153 CharSourceRange Expansion = getExpansionRange(Range.getAsRange());
1154 if (Expansion.getEnd() == Range.getEnd())
1155 Expansion.setTokenRange(Range.isTokenRange());
1156 return Expansion;
1157 }
1158
1159 /// Given a SourceLocation object, return the spelling
1160 /// location referenced by the ID.
1161 ///
1162 /// This is the place where the characters that make up the lexed token
1163 /// can be found.
1164 SourceLocation getSpellingLoc(SourceLocation Loc) const {
1165 // Handle the non-mapped case inline, defer to out of line code to handle
1166 // expansions.
1167 if (Loc.isFileID()) return Loc;
1168 return getSpellingLocSlowCase(Loc);
1169 }
1170
1171 /// Given a SourceLocation object, return the spelling location
1172 /// referenced by the ID.
1173 ///
1174 /// This is the first level down towards the place where the characters
1175 /// that make up the lexed token can be found. This should not generally
1176 /// be used by clients.
1177 SourceLocation getImmediateSpellingLoc(SourceLocation Loc) const;
1178
1179 /// Form a SourceLocation from a FileID and Offset pair.
1180 SourceLocation getComposedLoc(FileID FID, unsigned Offset) const {
1181 bool Invalid = false;
1182 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID, &Invalid);
1183 if (Invalid)
1184 return SourceLocation();
1185
1186 unsigned GlobalOffset = Entry.getOffset() + Offset;
1187 return Entry.isFile() ? SourceLocation::getFileLoc(GlobalOffset)
1188 : SourceLocation::getMacroLoc(GlobalOffset);
1189 }
1190
1191 /// Decompose the specified location into a raw FileID + Offset pair.
1192 ///
1193 /// The first element is the FileID, the second is the offset from the
1194 /// start of the buffer of the location.
1195 std::pair<FileID, unsigned> getDecomposedLoc(SourceLocation Loc) const {
1196 FileID FID = getFileID(Loc);
1197 bool Invalid = false;
1198 const SrcMgr::SLocEntry &E = getSLocEntry(FID, &Invalid);
1199 if (Invalid)
1200 return std::make_pair(FileID(), 0);
1201 return std::make_pair(FID, Loc.getOffset()-E.getOffset());
1202 }
1203
1204 /// Decompose the specified location into a raw FileID + Offset pair.
1205 ///
1206 /// If the location is an expansion record, walk through it until we find
1207 /// the final location expanded.
1208 std::pair<FileID, unsigned>
1209 getDecomposedExpansionLoc(SourceLocation Loc) const {
1210 FileID FID = getFileID(Loc);
1211 bool Invalid = false;
1212 const SrcMgr::SLocEntry *E = &getSLocEntry(FID, &Invalid);
1213 if (Invalid)
1214 return std::make_pair(FileID(), 0);
1215
1216 unsigned Offset = Loc.getOffset()-E->getOffset();
1217 if (Loc.isFileID())
1218 return std::make_pair(FID, Offset);
1219
1220 return getDecomposedExpansionLocSlowCase(E);
1221 }
1222
1223 /// Decompose the specified location into a raw FileID + Offset pair.
1224 ///
1225 /// If the location is an expansion record, walk through it until we find
1226 /// its spelling record.
1227 std::pair<FileID, unsigned>
1228 getDecomposedSpellingLoc(SourceLocation Loc) const {
1229 FileID FID = getFileID(Loc);
1230 bool Invalid = false;
1231 const SrcMgr::SLocEntry *E = &getSLocEntry(FID, &Invalid);
1232 if (Invalid)
1233 return std::make_pair(FileID(), 0);
1234
1235 unsigned Offset = Loc.getOffset()-E->getOffset();
1236 if (Loc.isFileID())
1237 return std::make_pair(FID, Offset);
1238 return getDecomposedSpellingLocSlowCase(E, Offset);
1239 }
1240
1241 /// Returns the "included/expanded in" decomposed location of the given
1242 /// FileID.
1243 std::pair<FileID, unsigned> getDecomposedIncludedLoc(FileID FID) const;
1244
1245 /// Returns the offset from the start of the file that the
1246 /// specified SourceLocation represents.
1247 ///
1248 /// This is not very meaningful for a macro ID.
1249 unsigned getFileOffset(SourceLocation SpellingLoc) const {
1250 return getDecomposedLoc(SpellingLoc).second;
1251 }
1252
1253 /// Tests whether the given source location represents a macro
1254 /// argument's expansion into the function-like macro definition.
1255 ///
1256 /// \param StartLoc If non-null and function returns true, it is set to the
1257 /// start location of the macro argument expansion.
1258 ///
1259 /// Such source locations only appear inside of the expansion
1260 /// locations representing where a particular function-like macro was
1261 /// expanded.
1262 bool isMacroArgExpansion(SourceLocation Loc,
1263 SourceLocation *StartLoc = nullptr) const;
1264
1265 /// Tests whether the given source location represents the expansion of
1266 /// a macro body.
1267 ///
1268 /// This is equivalent to testing whether the location is part of a macro
1269 /// expansion but not the expansion of an argument to a function-like macro.
1270 bool isMacroBodyExpansion(SourceLocation Loc) const;
1271
1272 /// Returns true if the given MacroID location points at the beginning
1273 /// of the immediate macro expansion.
1274 ///
1275 /// \param MacroBegin If non-null and function returns true, it is set to the
1276 /// begin location of the immediate macro expansion.
1277 bool isAtStartOfImmediateMacroExpansion(SourceLocation Loc,
1278 SourceLocation *MacroBegin = nullptr) const;
1279
1280 /// Returns true if the given MacroID location points at the character
1281 /// end of the immediate macro expansion.
1282 ///
1283 /// \param MacroEnd If non-null and function returns true, it is set to the
1284 /// character end location of the immediate macro expansion.
1285 bool
1286 isAtEndOfImmediateMacroExpansion(SourceLocation Loc,
1287 SourceLocation *MacroEnd = nullptr) const;
1288
1289 /// Returns true if \p Loc is inside the [\p Start, +\p Length)
1290 /// chunk of the source location address space.
1291 ///
1292 /// If it's true and \p RelativeOffset is non-null, it will be set to the
1293 /// relative offset of \p Loc inside the chunk.
1294 bool isInSLocAddrSpace(SourceLocation Loc,
1295 SourceLocation Start, unsigned Length,
1296 unsigned *RelativeOffset = nullptr) const {
1297 assert(((Start.getOffset() < NextLocalOffset &&
1298 Start.getOffset()+Length <= NextLocalOffset) ||
1299 (Start.getOffset() >= CurrentLoadedOffset &&
1300 Start.getOffset()+Length < MaxLoadedOffset)) &&
1301 "Chunk is not valid SLoc address space");
1302 unsigned LocOffs = Loc.getOffset();
1303 unsigned BeginOffs = Start.getOffset();
1304 unsigned EndOffs = BeginOffs + Length;
1305 if (LocOffs >= BeginOffs && LocOffs < EndOffs) {
1306 if (RelativeOffset)
1307 *RelativeOffset = LocOffs - BeginOffs;
1308 return true;
1309 }
1310
1311 return false;
1312 }
1313
1314 /// Return true if both \p LHS and \p RHS are in the local source
1315 /// location address space or the loaded one.
1316 ///
1317 /// If it's true and \p RelativeOffset is non-null, it will be set to the
1318 /// offset of \p RHS relative to \p LHS.
1319 bool isInSameSLocAddrSpace(SourceLocation LHS, SourceLocation RHS,
1320 int *RelativeOffset) const {
1321 unsigned LHSOffs = LHS.getOffset(), RHSOffs = RHS.getOffset();
1322 bool LHSLoaded = LHSOffs >= CurrentLoadedOffset;
1323 bool RHSLoaded = RHSOffs >= CurrentLoadedOffset;
1324
1325 if (LHSLoaded == RHSLoaded) {
1326 if (RelativeOffset)
1327 *RelativeOffset = RHSOffs - LHSOffs;
1328 return true;
1329 }
1330
1331 return false;
1332 }
1333
1334 //===--------------------------------------------------------------------===//
1335 // Queries about the code at a SourceLocation.
1336 //===--------------------------------------------------------------------===//
1337
1338 /// Return a pointer to the start of the specified location
1339 /// in the appropriate spelling MemoryBuffer.
1340 ///
1341 /// \param Invalid If non-NULL, will be set \c true if an error occurs.
1342 const char *getCharacterData(SourceLocation SL,
1343 bool *Invalid = nullptr) const;
1344
1345 /// Return the column # for the specified file position.
1346 ///
1347 /// This is significantly cheaper to compute than the line number. This
1348 /// returns zero if the column number isn't known. This may only be called
1349 /// on a file sloc, so you must choose a spelling or expansion location
1350 /// before calling this method.
1351 unsigned getColumnNumber(FileID FID, unsigned FilePos,
1352 bool *Invalid = nullptr) const;
1353 unsigned getSpellingColumnNumber(SourceLocation Loc,
1354 bool *Invalid = nullptr) const;
1355 unsigned getExpansionColumnNumber(SourceLocation Loc,
1356 bool *Invalid = nullptr) const;
1357 unsigned getPresumedColumnNumber(SourceLocation Loc,
1358 bool *Invalid = nullptr) const;
1359
1360 /// Given a SourceLocation, return the spelling line number
1361 /// for the position indicated.
1362 ///
1363 /// This requires building and caching a table of line offsets for the
1364 /// MemoryBuffer, so this is not cheap: use only when about to emit a
1365 /// diagnostic.
1366 unsigned getLineNumber(FileID FID, unsigned FilePos, bool *Invalid = nullptr) const;
1367 unsigned getSpellingLineNumber(SourceLocation Loc, bool *Invalid = nullptr) const;
1368 unsigned getExpansionLineNumber(SourceLocation Loc, bool *Invalid = nullptr) const;
1369 unsigned getPresumedLineNumber(SourceLocation Loc, bool *Invalid = nullptr) const;
1370
1371 /// Return the filename or buffer identifier of the buffer the
1372 /// location is in.
1373 ///
1374 /// Note that this name does not respect \#line directives. Use
1375 /// getPresumedLoc for normal clients.
1376 StringRef getBufferName(SourceLocation Loc, bool *Invalid = nullptr) const;
1377
1378 /// Return the file characteristic of the specified source
1379 /// location, indicating whether this is a normal file, a system
1380 /// header, or an "implicit extern C" system header.
1381 ///
1382 /// This state can be modified with flags on GNU linemarker directives like:
1383 /// \code
1384 /// # 4 "foo.h" 3
1385 /// \endcode
1386 /// which changes all source locations in the current file after that to be
1387 /// considered to be from a system header.
1388 SrcMgr::CharacteristicKind getFileCharacteristic(SourceLocation Loc) const;
1389
1390 /// Returns the "presumed" location of a SourceLocation specifies.
1391 ///
1392 /// A "presumed location" can be modified by \#line or GNU line marker
1393 /// directives. This provides a view on the data that a user should see
1394 /// in diagnostics, for example.
1395 ///
1396 /// Note that a presumed location is always given as the expansion point of
1397 /// an expansion location, not at the spelling location.
1398 ///
1399 /// \returns The presumed location of the specified SourceLocation. If the
1400 /// presumed location cannot be calculated (e.g., because \p Loc is invalid
1401 /// or the file containing \p Loc has changed on disk), returns an invalid
1402 /// presumed location.
1403 PresumedLoc getPresumedLoc(SourceLocation Loc,
1404 bool UseLineDirectives = true) const;
1405
1406 /// Returns whether the PresumedLoc for a given SourceLocation is
1407 /// in the main file.
1408 ///
1409 /// This computes the "presumed" location for a SourceLocation, then checks
1410 /// whether it came from a file other than the main file. This is different
1411 /// from isWrittenInMainFile() because it takes line marker directives into
1412 /// account.
1413 bool isInMainFile(SourceLocation Loc) const;
1414
1415 /// Returns true if the spelling locations for both SourceLocations
1416 /// are part of the same file buffer.
1417 ///
1418 /// This check ignores line marker directives.
1419 bool isWrittenInSameFile(SourceLocation Loc1, SourceLocation Loc2) const {
1420 return getFileID(Loc1) == getFileID(Loc2);
1421 }
1422
1423 /// Returns true if the spelling location for the given location
1424 /// is in the main file buffer.
1425 ///
1426 /// This check ignores line marker directives.
1427 bool isWrittenInMainFile(SourceLocation Loc) const {
1428 return getFileID(Loc) == getMainFileID();
1429 }
1430
1431 /// Returns if a SourceLocation is in a system header.
1432 bool isInSystemHeader(SourceLocation Loc) const {
1433 return isSystem(getFileCharacteristic(Loc));
1434 }
1435
1436 /// Returns if a SourceLocation is in an "extern C" system header.
1437 bool isInExternCSystemHeader(SourceLocation Loc) const {
1438 return getFileCharacteristic(Loc) == SrcMgr::C_ExternCSystem;
1439 }
1440
1441 /// Returns whether \p Loc is expanded from a macro in a system header.
1442 bool isInSystemMacro(SourceLocation loc) const {
1443 return loc.isMacroID() && isInSystemHeader(getSpellingLoc(loc));
1444 }
1445
1446 /// The size of the SLocEntry that \p FID represents.
1447 unsigned getFileIDSize(FileID FID) const;
1448
1449 /// Given a specific FileID, returns true if \p Loc is inside that
1450 /// FileID chunk and sets relative offset (offset of \p Loc from beginning
1451 /// of FileID) to \p relativeOffset.
1452 bool isInFileID(SourceLocation Loc, FileID FID,
1453 unsigned *RelativeOffset = nullptr) const {
1454 unsigned Offs = Loc.getOffset();
1455 if (isOffsetInFileID(FID, Offs)) {
1456 if (RelativeOffset)
1457 *RelativeOffset = Offs - getSLocEntry(FID).getOffset();
1458 return true;
1459 }
1460
1461 return false;
1462 }
1463
1464 //===--------------------------------------------------------------------===//
1465 // Line Table Manipulation Routines
1466 //===--------------------------------------------------------------------===//
1467
1468 /// Return the uniqued ID for the specified filename.
1469 unsigned getLineTableFilenameID(StringRef Str);
1470
1471 /// Add a line note to the line table for the FileID and offset
1472 /// specified by Loc.
1473 ///
1474 /// If FilenameID is -1, it is considered to be unspecified.
1475 void AddLineNote(SourceLocation Loc, unsigned LineNo, int FilenameID,
1476 bool IsFileEntry, bool IsFileExit,
1477 SrcMgr::CharacteristicKind FileKind);
1478
1479 /// Determine if the source manager has a line table.
1480 bool hasLineTable() const { return LineTable != nullptr; }
1481
1482 /// Retrieve the stored line table.
1483 LineTableInfo &getLineTable();
1484
1485 //===--------------------------------------------------------------------===//
1486 // Queries for performance analysis.
1487 //===--------------------------------------------------------------------===//
1488
1489 /// Return the total amount of physical memory allocated by the
1490 /// ContentCache allocator.
1491 size_t getContentCacheSize() const {
1492 return ContentCacheAlloc.getTotalMemory();
1493 }
1494
1495 struct MemoryBufferSizes {
1496 const size_t malloc_bytes;
1497 const size_t mmap_bytes;
1498
1499 MemoryBufferSizes(size_t malloc_bytes, size_t mmap_bytes)
1500 : malloc_bytes(malloc_bytes), mmap_bytes(mmap_bytes) {}
1501 };
1502
1503 /// Return the amount of memory used by memory buffers, breaking down
1504 /// by heap-backed versus mmap'ed memory.
1505 MemoryBufferSizes getMemoryBufferSizes() const;
1506
1507 /// Return the amount of memory used for various side tables and
1508 /// data structures in the SourceManager.
1509 size_t getDataStructureSizes() const;
1510
1511 //===--------------------------------------------------------------------===//
1512 // Other miscellaneous methods.
1513 //===--------------------------------------------------------------------===//
1514
1515 /// Get the source location for the given file:line:col triplet.
1516 ///
1517 /// If the source file is included multiple times, the source location will
1518 /// be based upon the first inclusion.
1519 SourceLocation translateFileLineCol(const FileEntry *SourceFile,
1520 unsigned Line, unsigned Col) const;
1521
1522 /// Get the FileID for the given file.
1523 ///
1524 /// If the source file is included multiple times, the FileID will be the
1525 /// first inclusion.
1526 FileID translateFile(const FileEntry *SourceFile) const;
1527
1528 /// Get the source location in \p FID for the given line:col.
1529 /// Returns null location if \p FID is not a file SLocEntry.
1530 SourceLocation translateLineCol(FileID FID,
1531 unsigned Line, unsigned Col) const;
1532
1533 /// If \p Loc points inside a function macro argument, the returned
1534 /// location will be the macro location in which the argument was expanded.
1535 /// If a macro argument is used multiple times, the expanded location will
1536 /// be at the first expansion of the argument.
1537 /// e.g.
1538 /// MY_MACRO(foo);
1539 /// ^
1540 /// Passing a file location pointing at 'foo', will yield a macro location
1541 /// where 'foo' was expanded into.
1542 SourceLocation getMacroArgExpandedLocation(SourceLocation Loc) const;
1543
1544 /// Determines the order of 2 source locations in the translation unit.
1545 ///
1546 /// \returns true if LHS source location comes before RHS, false otherwise.
1547 bool isBeforeInTranslationUnit(SourceLocation LHS, SourceLocation RHS) const;
1548
1549 /// Determines whether the two decomposed source location is in the
1550 /// same translation unit. As a byproduct, it also calculates the order
1551 /// of the source locations in case they are in the same TU.
1552 ///
1553 /// \returns Pair of bools the first component is true if the two locations
1554 /// are in the same TU. The second bool is true if the first is true
1555 /// and \p LOffs is before \p ROffs.
1556 std::pair<bool, bool>
1557 isInTheSameTranslationUnit(std::pair<FileID, unsigned> &LOffs,
1558 std::pair<FileID, unsigned> &ROffs) const;
1559
1560 /// Determines the order of 2 source locations in the "source location
1561 /// address space".
1562 bool isBeforeInSLocAddrSpace(SourceLocation LHS, SourceLocation RHS) const {
1563 return isBeforeInSLocAddrSpace(LHS, RHS.getOffset());
1564 }
1565
1566 /// Determines the order of a source location and a source location
1567 /// offset in the "source location address space".
1568 ///
1569 /// Note that we always consider source locations loaded from
1570 bool isBeforeInSLocAddrSpace(SourceLocation LHS, unsigned RHS) const {
1571 unsigned LHSOffset = LHS.getOffset();
1572 bool LHSLoaded = LHSOffset >= CurrentLoadedOffset;
1573 bool RHSLoaded = RHS >= CurrentLoadedOffset;
1574 if (LHSLoaded == RHSLoaded)
1575 return LHSOffset < RHS;
1576
1577 return LHSLoaded;
1578 }
1579
1580 /// Return true if the Point is within Start and End.
1581 bool isPointWithin(SourceLocation Location, SourceLocation Start,
1582 SourceLocation End) const {
1583 return Location == Start || Location == End ||
1584 (isBeforeInTranslationUnit(Start, Location) &&
1585 isBeforeInTranslationUnit(Location, End));
1586 }
1587
1588 // Iterators over FileInfos.
1589 using fileinfo_iterator =
1590 llvm::DenseMap<const FileEntry*, SrcMgr::ContentCache*>::const_iterator;
1591
1592 fileinfo_iterator fileinfo_begin() const { return FileInfos.begin(); }
1593 fileinfo_iterator fileinfo_end() const { return FileInfos.end(); }
1594 bool hasFileInfo(const FileEntry *File) const {
1595 return FileInfos.find(File) != FileInfos.end();
1596 }
1597
1598 /// Print statistics to stderr.
1599 void PrintStats() const;
1600
1601 void dump() const;
1602
1603 /// Get the number of local SLocEntries we have.
1604 unsigned local_sloc_entry_size() const { return LocalSLocEntryTable.size(); }
1605
1606 /// Get a local SLocEntry. This is exposed for indexing.
1607 const SrcMgr::SLocEntry &getLocalSLocEntry(unsigned Index,
1608 bool *Invalid = nullptr) const {
1609 assert(Index < LocalSLocEntryTable.size() && "Invalid index");
1610 return LocalSLocEntryTable[Index];
1611 }
1612
1613 /// Get the number of loaded SLocEntries we have.
1614 unsigned loaded_sloc_entry_size() const { return LoadedSLocEntryTable.size();}
1615
1616 /// Get a loaded SLocEntry. This is exposed for indexing.
1617 const SrcMgr::SLocEntry &getLoadedSLocEntry(unsigned Index,
1618 bool *Invalid = nullptr) const {
1619 assert(Index < LoadedSLocEntryTable.size() && "Invalid index");
1620 if (SLocEntryLoaded[Index])
1621 return LoadedSLocEntryTable[Index];
1622 return loadSLocEntry(Index, Invalid);
1623 }
1624
1625 const SrcMgr::SLocEntry &getSLocEntry(FileID FID,
1626 bool *Invalid = nullptr) const {
1627 if (FID.ID == 0 || FID.ID == -1) {
1628 if (Invalid) *Invalid = true;
1629 return LocalSLocEntryTable[0];
1630 }
1631 return getSLocEntryByID(FID.ID, Invalid);
1632 }
1633
1634 unsigned getNextLocalOffset() const { return NextLocalOffset; }
1635
1636 void setExternalSLocEntrySource(ExternalSLocEntrySource *Source) {
1637 assert(LoadedSLocEntryTable.empty() &&
1638 "Invalidating existing loaded entries");
1639 ExternalSLocEntries = Source;
1640 }
1641
1642 /// Allocate a number of loaded SLocEntries, which will be actually
1643 /// loaded on demand from the external source.
1644 ///
1645 /// NumSLocEntries will be allocated, which occupy a total of TotalSize space
1646 /// in the global source view. The lowest ID and the base offset of the
1647 /// entries will be returned.
1648 std::pair<int, unsigned>
1649 AllocateLoadedSLocEntries(unsigned NumSLocEntries, unsigned TotalSize);
1650
1651 /// Returns true if \p Loc came from a PCH/Module.
1652 bool isLoadedSourceLocation(SourceLocation Loc) const {
1653 return Loc.getOffset() >= CurrentLoadedOffset;
1654 }
1655
1656 /// Returns true if \p Loc did not come from a PCH/Module.
1657 bool isLocalSourceLocation(SourceLocation Loc) const {
1658 return Loc.getOffset() < NextLocalOffset;
1659 }
1660
1661 /// Returns true if \p FID came from a PCH/Module.
1662 bool isLoadedFileID(FileID FID) const {
1663 assert(FID.ID != -1 && "Using FileID sentinel value");
1664 return FID.ID < 0;
1665 }
1666
1667 /// Returns true if \p FID did not come from a PCH/Module.
1668 bool isLocalFileID(FileID FID) const {
1669 return !isLoadedFileID(FID);
1670 }
1671
1672 /// Gets the location of the immediate macro caller, one level up the stack
1673 /// toward the initial macro typed into the source.
1674 SourceLocation getImmediateMacroCallerLoc(SourceLocation Loc) const {
1675 if (!Loc.isMacroID()) return Loc;
1676
1677 // When we have the location of (part of) an expanded parameter, its
1678 // spelling location points to the argument as expanded in the macro call,
1679 // and therefore is used to locate the macro caller.
1680 if (isMacroArgExpansion(Loc))
1681 return getImmediateSpellingLoc(Loc);
1682
1683 // Otherwise, the caller of the macro is located where this macro is
1684 // expanded (while the spelling is part of the macro definition).
1685 return getImmediateExpansionRange(Loc).getBegin();
1686 }
1687
1688 /// \return Location of the top-level macro caller.
1689 SourceLocation getTopMacroCallerLoc(SourceLocation Loc) const;
1690
1691private:
1692 friend class ASTReader;
1693 friend class ASTWriter;
1694
1695 llvm::MemoryBuffer *getFakeBufferForRecovery() const;
1696 const SrcMgr::ContentCache *getFakeContentCacheForRecovery() const;
1697
1698 const SrcMgr::SLocEntry &loadSLocEntry(unsigned Index, bool *Invalid) const;
1699
1700 /// Get the entry with the given unwrapped FileID.
1701 const SrcMgr::SLocEntry &getSLocEntryByID(int ID,
1702 bool *Invalid = nullptr) const {
1703 assert(ID != -1 && "Using FileID sentinel value");
1704 if (ID < 0)
1705 return getLoadedSLocEntryByID(ID, Invalid);
1706 return getLocalSLocEntry(static_cast<unsigned>(ID), Invalid);
1707 }
1708
1709 const SrcMgr::SLocEntry &
1710 getLoadedSLocEntryByID(int ID, bool *Invalid = nullptr) const {
1711 return getLoadedSLocEntry(static_cast<unsigned>(-ID - 2), Invalid);
1712 }
1713
1714 /// Implements the common elements of storing an expansion info struct into
1715 /// the SLocEntry table and producing a source location that refers to it.
1716 SourceLocation createExpansionLocImpl(const SrcMgr::ExpansionInfo &Expansion,
1717 unsigned TokLength,
1718 int LoadedID = 0,
1719 unsigned LoadedOffset = 0);
1720
1721 /// Return true if the specified FileID contains the
1722 /// specified SourceLocation offset. This is a very hot method.
1723 inline bool isOffsetInFileID(FileID FID, unsigned SLocOffset) const {
1724 const SrcMgr::SLocEntry &Entry = getSLocEntry(FID);
1725 // If the entry is after the offset, it can't contain it.
1726 if (SLocOffset < Entry.getOffset()) return false;
1727
1728 // If this is the very last entry then it does.
1729 if (FID.ID == -2)
1730 return true;
1731
1732 // If it is the last local entry, then it does if the location is local.
1733 if (FID.ID+1 == static_cast<int>(LocalSLocEntryTable.size()))
1734 return SLocOffset < NextLocalOffset;
1735
1736 // Otherwise, the entry after it has to not include it. This works for both
1737 // local and loaded entries.
1738 return SLocOffset < getSLocEntryByID(FID.ID+1).getOffset();
1739 }
1740
1741 /// Returns the previous in-order FileID or an invalid FileID if there
1742 /// is no previous one.
1743 FileID getPreviousFileID(FileID FID) const;
1744
1745 /// Returns the next in-order FileID or an invalid FileID if there is
1746 /// no next one.
1747 FileID getNextFileID(FileID FID) const;
1748
1749 /// Create a new fileID for the specified ContentCache and
1750 /// include position.
1751 ///
1752 /// This works regardless of whether the ContentCache corresponds to a
1753 /// file or some other input source.
1754 FileID createFileID(const SrcMgr::ContentCache* File,
1755 SourceLocation IncludePos,
1756 SrcMgr::CharacteristicKind DirCharacter,
1757 int LoadedID, unsigned LoadedOffset);
1758
1759 const SrcMgr::ContentCache *
1760 getOrCreateContentCache(const FileEntry *SourceFile,
1761 bool isSystemFile = false);
1762
1763 /// Create a new ContentCache for the specified memory buffer.
1764 const SrcMgr::ContentCache *
1765 createMemBufferContentCache(llvm::MemoryBuffer *Buf, bool DoNotFree);
1766
1767 FileID getFileIDSlow(unsigned SLocOffset) const;
1768 FileID getFileIDLocal(unsigned SLocOffset) const;
1769 FileID getFileIDLoaded(unsigned SLocOffset) const;
1770
1771 SourceLocation getExpansionLocSlowCase(SourceLocation Loc) const;
1772 SourceLocation getSpellingLocSlowCase(SourceLocation Loc) const;
1773 SourceLocation getFileLocSlowCase(SourceLocation Loc) const;
1774
1775 std::pair<FileID, unsigned>
1776 getDecomposedExpansionLocSlowCase(const SrcMgr::SLocEntry *E) const;
1777 std::pair<FileID, unsigned>
1778 getDecomposedSpellingLocSlowCase(const SrcMgr::SLocEntry *E,
1779 unsigned Offset) const;
1780 void computeMacroArgsCache(MacroArgsMap &MacroArgsCache, FileID FID) const;
1781 void associateFileChunkWithMacroArgExp(MacroArgsMap &MacroArgsCache,
1782 FileID FID,
1783 SourceLocation SpellLoc,
1784 SourceLocation ExpansionLoc,
1785 unsigned ExpansionLength) const;
1786};
1787
1788/// Comparison function object.
1789template<typename T>
1790class BeforeThanCompare;
1791
1792/// Compare two source locations.
1793template<>
1794class BeforeThanCompare<SourceLocation> {
1795 SourceManager &SM;
1796
1797public:
1798 explicit BeforeThanCompare(SourceManager &SM) : SM(SM) {}
1799
1800 bool operator()(SourceLocation LHS, SourceLocation RHS) const {
1801 return SM.isBeforeInTranslationUnit(LHS, RHS);
1802 }
1803};
1804
1805/// Compare two non-overlapping source ranges.
1806template<>
1807class BeforeThanCompare<SourceRange> {
1808 SourceManager &SM;
1809
1810public:
1811 explicit BeforeThanCompare(SourceManager &SM) : SM(SM) {}
1812
1813 bool operator()(SourceRange LHS, SourceRange RHS) const {
1814 return SM.isBeforeInTranslationUnit(LHS.getBegin(), RHS.getBegin());
1815 }
1816};
1817
1818/// SourceManager and necessary depdencies (e.g. VFS, FileManager) for a single
1819/// in-memorty file.
1820class SourceManagerForFile {
1821public:
1822 /// Creates SourceManager and necessary depdencies (e.g. VFS, FileManager).
1823 /// The main file in the SourceManager will be \p FileName with \p Content.
1824 SourceManagerForFile(StringRef FileName, StringRef Content);
1825
1826 SourceManager &get() {
1827 assert(SourceMgr);
1828 return *SourceMgr;
1829 }
1830
1831private:
1832 // The order of these fields are important - they should be in the same order
1833 // as they are created in `createSourceManagerForFile` so that they can be
1834 // deleted in the reverse order as they are created.
1835 std::unique_ptr<FileManager> FileMgr;
1836 std::unique_ptr<DiagnosticsEngine> Diagnostics;
1837 std::unique_ptr<SourceManager> SourceMgr;
1838};
1839
1840} // namespace clang
1841
1842#endif // LLVM_CLANG_BASIC_SOURCEMANAGER_H
1843