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hotspot/src/share/vm/adlc/filebuff.hpp

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+/*
+ * Copyright 1997-2004 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// FILEBUFF.HPP - Definitions for parser file buffering routines
+
+#if _MSC_VER >= 1300  // Visual C++ 7.0 or later
+#include <iostream>
+#else
+#include <iostream.h>
+#endif
+
+// STRUCTURE FOR HANDLING INPUT AND OUTPUT FILES
+typedef struct {
+  const char *_name;
+  FILE *_fp;
+} BufferedFile;
+
+class ArchDesc;
+
+//------------------------------FileBuff--------------------------------------
+// This class defines a nicely behaved buffer of text.  Entire file of text
+// is read into buffer at creation, with sentinals at start and end.
+class FileBuff {
+  friend class FileBuffRegion;
+ private:
+  long  _bufferSize;            // Size of text holding buffer.
+  long  _offset;                // Expected filepointer offset.
+  long  _bufoff;                // Start of buffer file offset
+
+  char *_buf;                   // The buffer itself.
+  char *_bigbuf;                // The buffer plus sentinals; actual heap area
+  char *_bufmax;                // A pointer to the buffer end sentinal
+  char *_bufeol;                // A pointer to the last complete line end
+
+  int   _err;                   // Error flag for file seek/read operations
+  long  _filepos;               // Current offset from start of file
+
+  ArchDesc& _AD;                // Reference to Architecture Description
+
+  // Error reporting function
+  void file_error(int flag, int linenum, const char *fmt, ...);
+
+ public:
+  const BufferedFile *_fp;           // File to be buffered
+
+  FileBuff(BufferedFile *fp, ArchDesc& archDesc); // Constructor
+  ~FileBuff();                  // Destructor
+
+  // This returns a pointer to the start of the current line in the buffer,
+  // and increments bufeol and filepos to point at the end of that line.
+  char *get_line(void);
+
+  // This converts a pointer into the buffer to a file offset.  It only works
+  // when the pointer is valid (i.e. just obtained from getline()).
+  int getoff(const char *s) { return _bufoff+(int)(s-_buf); }
+};
+
+//------------------------------FileBuffRegion---------------------------------
+// A buffer region is really a region of some file, specified as a linked list
+// of offsets and lengths.  These regions can be merged; overlapping regions
+// will coalesce.
+class FileBuffRegion {
+ public:                        // Workaround dev-studio friend/private bug
+  FileBuffRegion *_next;        // Linked list of regions sorted by offset.
+ private:
+  FileBuff       *_bfr;         // The Buffer of the file
+  int _offset, _length;         // The file area
+  int             _sol;         // Start of line where the file area starts
+  int             _line;        // First line of region
+
+ public:
+  FileBuffRegion(FileBuff*, int sol, int line, int offset, int len);
+  ~FileBuffRegion();
+
+  FileBuffRegion *copy();                   // Deep copy
+  FileBuffRegion *merge(FileBuffRegion*); // Merge 2 regions; delete input
+
+//  void print(std::ostream&);
+//  friend std::ostream& operator<< (std::ostream&, FileBuffRegion&);
+  void print(ostream&);
+  friend ostream& operator<< (ostream&, FileBuffRegion&);
+};