Update clang to 91430.

1 files changed, 32 insertions, 43 deletions

diff --git a/include/clang/Basic/SourceManager.h b/include/clang/Basic/SourceManager.h
index 7e9ac53..b4cf959 100644
--- a/include/clang/Basic/SourceManager.h
+++ b/include/clang/Basic/SourceManager.h
@@ -54,9 +54,6 @@ namespace SrcMgr {
     /// file.  This is owned by the ContentCache object.
     mutable const llvm::MemoryBuffer *Buffer;
 
-    /// The line and column at which we should truncate the file.
-    unsigned TruncateAtLine, TruncateAtColumn;
-    
   public:
     /// Reference to the file entry.  This reference does not own
     /// the FileEntry object.  It is possible for this to be NULL if
@@ -72,13 +69,10 @@ namespace SrcMgr {
     /// if SourceLineCache is non-null.
     unsigned NumLines;
 
-    /// FirstFID - First FileID that was created for this ContentCache.
-    /// Represents the first source inclusion of the file associated with this
-    /// ContentCache.
-    mutable FileID FirstFID;
-
-    /// getBuffer - Returns the memory buffer for the associated content.
-    const llvm::MemoryBuffer *getBuffer() const;
+    /// getBuffer - Returns the memory buffer for the associated content.  If
+    /// there is an error opening this buffer the first time, this manufactures
+    /// a temporary buffer and returns a non-empty error string.
+    const llvm::MemoryBuffer *getBuffer(std::string *ErrorStr = 0) const;
 
     /// getSize - Returns the size of the content encapsulated by this
     ///  ContentCache. This can be the size of the source file or the size of an
@@ -96,28 +90,19 @@ namespace SrcMgr {
       Buffer = B;
     }
 
-    /// \brief Truncate this file at the given line and column.
-    ///
-    /// \param Line the line on which to truncate the current file (1-based).
-    /// \param Column the column at which to truncate the current file.
-    /// (1-based).
-    void truncateAt(unsigned Line, unsigned Column);
-    
-    /// \brief Determines whether the file was artificially truncated with
-    /// truncateAt().
-    bool isTruncated() const { return TruncateAtLine && TruncateAtColumn; }
-      
+    /// \brief Replace the existing buffer (which will be deleted)
+    /// with the given buffer.
+    void replaceBuffer(const llvm::MemoryBuffer *B);
+
     ContentCache(const FileEntry *Ent = 0)
-      : Buffer(0), TruncateAtLine(0), TruncateAtColumn(0), Entry(Ent), 
-        SourceLineCache(0), NumLines(0) {}
+      : Buffer(0), Entry(Ent), SourceLineCache(0), NumLines(0) {}
 
     ~ContentCache();
 
     /// The copy ctor does not allow copies where source object has either
     ///  a non-NULL Buffer or SourceLineCache.  Ownership of allocated memory
     ///  is not transfered, so this is a logical error.
-    ContentCache(const ContentCache &RHS) 
-      : Buffer(0), TruncateAtLine(0), TruncateAtColumn(0), SourceLineCache(0) {
+    ContentCache(const ContentCache &RHS) : Buffer(0), SourceLineCache(0) {
       Entry = RHS.Entry;
 
       assert (RHS.Buffer == 0 && RHS.SourceLineCache == 0
@@ -347,19 +332,13 @@ class SourceManager {
   mutable FileID LastRFIDForBeforeTUCheck;
   mutable bool   LastResForBeforeTUCheck;
 
-  // Keep track of the file/line/column that we should truncate.
-  const FileEntry *TruncateFile;
-  unsigned TruncateAtLine;
-  unsigned TruncateAtColumn;
-  
   // SourceManager doesn't support copy construction.
   explicit SourceManager(const SourceManager&);
   void operator=(const SourceManager&);
 public:
   SourceManager()
-    : ExternalSLocEntries(0), LineTable(0), NumLinearScans(0),
-      NumBinaryProbes(0), TruncateFile(0), TruncateAtLine(0),
-      TruncateAtColumn(0) {
+    : ExternalSLocEntries(0), LineTable(0), NumLinearScans(0), 
+      NumBinaryProbes(0) {
     clearIDTables();
   }
   ~SourceManager();
@@ -428,14 +407,30 @@ public:
                                         unsigned PreallocatedID = 0,
                                         unsigned Offset = 0);
 
+  /// \brief Retrieve the memory buffer associated with the given file.
+  const llvm::MemoryBuffer *getMemoryBufferForFile(const FileEntry *File);
+
+  /// \brief Override the contents of the given source file by providing an
+  /// already-allocated buffer.
+  ///
+  /// \param SourceFile the source file whose contents will be override.
+  ///
+  /// \param Buffer the memory buffer whose contents will be used as the
+  /// data in the given source file.
+  ///
+  /// \returns true if an error occurred, false otherwise.
+  bool overrideFileContents(const FileEntry *SourceFile,
+                            const llvm::MemoryBuffer *Buffer);
+
   //===--------------------------------------------------------------------===//
   // FileID manipulation methods.
   //===--------------------------------------------------------------------===//
 
-  /// getBuffer - Return the buffer for the specified FileID.
-  ///
-  const llvm::MemoryBuffer *getBuffer(FileID FID) const {
-    return getSLocEntry(FID).getFile().getContentCache()->getBuffer();
+  /// getBuffer - Return the buffer for the specified FileID. If there is an
+  /// error opening this buffer the first time, this manufactures a temporary
+  /// buffer and returns a non-empty error string.
+  const llvm::MemoryBuffer *getBuffer(FileID FID, std::string *Error = 0) const{
+    return getSLocEntry(FID).getFile().getContentCache()->getBuffer(Error);
   }
 
   /// getFileEntryForID - Returns the FileEntry record for the provided FileID.
@@ -669,12 +664,6 @@ public:
   /// \returns true if LHS source location comes before RHS, false otherwise.
   bool isBeforeInTranslationUnit(SourceLocation LHS, SourceLocation RHS) const;
 
-  /// \brief Truncate the given file at the specified line/column.
-  void truncateFileAt(const FileEntry *Entry, unsigned Line, unsigned Column);
-  
-  /// \brief Determine whether this file was truncated.
-  bool isTruncatedFile(FileID FID) const;
-  
   // Iterators over FileInfos.
   typedef llvm::DenseMap<const FileEntry*, SrcMgr::ContentCache*>
       ::const_iterator fileinfo_iterator;