Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 1997-2009 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.CPP - Routines for handling a parser file buffer

 #include "adlc.hpp"

 using namespace std;

 //------------------------------FileBuff---------------------------------------

 // Create a new parsing buffer

 FileBuff::FileBuff( BufferedFile *fptr, ArchDesc& archDesc) : _fp(fptr), _AD(archDesc) {

   _err = fseek(_fp->_fp, 0, SEEK_END);  // Seek to end of file

   if (_err) {

     file_error(SEMERR, 0, "File seek error reading input file");

     exit(1);                    // Exit on seek error

   }

   _filepos = ftell(_fp->_fp);   // Find offset of end of file

   _bufferSize = _filepos + 5;   // Filepos points to last char, so add padding

   _err = fseek(_fp->_fp, 0, SEEK_SET);  // Reset to beginning of file

   if (_err) {

     file_error(SEMERR, 0, "File seek error reading input file\n");

     exit(1);                    // Exit on seek error

   }

   _filepos = ftell(_fp->_fp);      // Reset current file position

   _linenum = 0;

   _bigbuf = new char[_bufferSize]; // Create buffer to hold text for parser

   if( !_bigbuf ) {

     file_error(SEMERR, 0, "Buffer allocation failed\n");

     exit(1);                    // Exit on allocation failure

   }

   *_bigbuf = '\n';               // Lead with a sentinel newline

   _buf = _bigbuf+1;                     // Skip sentinel

   _bufmax = _buf;               // Buffer is empty

   _bufeol = _bigbuf;              // _bufeol points at sentinel

   _filepos = -1;                 // filepos is in sync with _bufeol

   _bufoff = _offset = 0L;       // Offset at file start

   _bufmax += fread(_buf, 1, _bufferSize-2, _fp->_fp); // Fill buffer & set end value

   if (_bufmax == _buf) {

     file_error(SEMERR, 0, "File read error, no input read\n");

     exit(1);                     // Exit on read error

   }

   *_bufmax = '\n';               // End with a sentinel new-line

   *(_bufmax+1) = '\0';           // Then end with a sentinel NULL

 }

 //------------------------------~FileBuff--------------------------------------

 // Nuke the FileBuff

 FileBuff::~FileBuff() {

   delete _bigbuf;

 }

 //------------------------------get_line----------------------------------------

 char *FileBuff::get_line(void) {

   char *retval;

   // Check for end of file & return NULL

   if (_bufeol >= _bufmax) return NULL;

   _linenum++;

   retval = ++_bufeol;      // return character following end of previous line

   if (*retval == '\0') return NULL; // Check for EOF sentinel

   // Search for newline character which must end each line

   for(_filepos++; *_bufeol != '\n'; _bufeol++)

     _filepos++;                    // keep filepos in sync with _bufeol

   // _bufeol & filepos point at end of current line, so return pointer to start

   return retval;

 }

 //------------------------------FileBuffRegion---------------------------------

 // Create a new region in a FileBuff.

 FileBuffRegion::FileBuffRegion( FileBuff* bufr, int soln, int ln,

                                 int off, int len)

 : _bfr(bufr), _sol(soln), _line(ln), _offset(off), _length(len) {

   _next = NULL;                 // No chained regions

 }

 //------------------------------~FileBuffRegion--------------------------------

 // Delete the entire linked list of buffer regions.

 FileBuffRegion::~FileBuffRegion() {

   if( _next ) delete _next;

 }

 //------------------------------copy-------------------------------------------

 // Deep copy a FileBuffRegion

 FileBuffRegion *FileBuffRegion::copy() {

   if( !this ) return NULL;      // The empty buffer region

   FileBuffRegion *br = new FileBuffRegion(_bfr,_sol,_line,_offset,_length);

   if( _next ) br->_next = _next->copy();

   return br;

 }

 //------------------------------merge------------------------------------------

 // Merge another buffer region into this buffer region.  Make overlapping areas

 // become a single region.  Remove (delete) the input FileBuffRegion.

 // Since the buffer regions are sorted by file offset, this is a varient of a

 // "sorted-merge" running in linear time.

 FileBuffRegion *FileBuffRegion::merge( FileBuffRegion *br ) {

   if( !br ) return this;        // Merging nothing

   if( !this ) return br;        // Merging into nothing

   assert( _bfr == br->_bfr, "" );     // Check for pointer-equivalent buffers

   if( _offset < br->_offset ) { // "this" starts before "br"

     if( _offset+_length < br->_offset ) { // "this" ends before "br"

       if( _next ) _next->merge( br );    // Merge with remainder of list

       else _next = br;                 // No more in this list; just append.

     } else {                           // Regions overlap.

       int l = br->_offset + br->_length - _offset;

       if( l > _length ) _length = l;     // Pick larger region

       FileBuffRegion *nr = br->_next;     // Get rest of region

       br->_next = NULL;         // Remove indication of rest of region

       delete br;                // Delete this region (it's been subsumed).

       if( nr ) merge( nr );     // Merge with rest of region

     }                           // End of if regions overlap or not.

   } else {                      // "this" starts after "br"

     if( br->_offset+br->_length < _offset ) {    // "br" ends before "this"

       FileBuffRegion *nr = new FileBuffRegion(_bfr,_sol,_line,_offset,_length);

       nr->_next = _next;                // Structure copy "this" guy to "nr"

       *this = *br;              // Structure copy "br" over "this".

       br->_next = NULL;         // Remove indication of rest of region

       delete br;                // Delete this region (it's been copied)

       merge( nr );              // Finish merging

     } else {                    // Regions overlap.

       int l = _offset + _length - br->_offset;

       if( l > _length ) _length = l;    // Pick larger region

       _offset = br->_offset;            // Start with earlier region

       _sol = br->_sol;                  // Also use earlier line start

       _line = br->_line;                        // Also use earlier line

       FileBuffRegion *nr = br->_next;   // Get rest of region

       br->_next = NULL;         // Remove indication of rest of region

       delete br;                // Delete this region (it's been subsumed).

       if( nr ) merge( nr );     // Merge with rest of region

     }                           // End of if regions overlap or not.

   }

   return this;

 }

 //------------------------------expandtab--------------------------------------

 static int expandtab( ostream &os, int off, char c, char fill1, char fill2 ) {

   if( c == '\t' ) {             // Tab?

     do os << fill1;             // Expand the tab; Output space

     while( (++off) & 7 );       // Expand to tab stop

   } else {                      // Normal character

     os << fill2;                // Display normal character

     off++;                      // Increment "cursor" offset

   }

   return off;

 }

 //------------------------------printline--------------------------------------

 // Print and highlite a region of a line.  Return the amount of highliting left

 // to do (i.e. highlite length minus length of line).

 static int printline( ostream& os, const char *fname, int line,

                         const char *_sol, int skip, int len ) {

   // Display the entire tab-expanded line

   os << fname << ":" << line << ": ";

   const char *t = strchr(_sol,'\n')+1; // End of line

   int off = 0;                  // Cursor offset for tab expansion

   const char *s = _sol;         // Nice string pointer

   while( t-s ) {                // Display whole line

     char c = *s++;              // Get next character to display

     off = expandtab(os,off,c,' ',c);

   }

   // Display the tab-expanded skippings before underlining.

   os << fname << ":" << line << ": ";

   off = 0;                      // Cursor offset for tab expansion

   s = _sol;                     // Restart string pointer

   // Start underlining.

   if( skip != -1 ) {            // The no-start-indicating flag

     const char *u = _sol+skip;  // Amount to skip

     while( u-s )                // Display skipped part

       off = expandtab(os,off,*s++,' ',' ');

     os << '^';                  // Start region

     off++;                      // Moved cursor

     len--;                      // 1 less char to do

     if( *s++ == '\t' )          // Starting character is a tab?

       off = expandtab(os,off,'\t','-','^');

   }

   // Long region doesn't end on this line

   int llen = (int)(t-s);        // Length of line, minus what's already done

   if( len > llen ) {            // Doing entire rest of line?

     while( t-s )                // Display rest of line

       off = expandtab(os,off,*s++,'-','-');

     os << '\n';                 // EOL

     return len-llen;            // Return what's not yet done.

   }

   // Region does end on this line.  This code fails subtly if the region ends

   // in a tab character.

   int i;

   for( i=1; i<len; i++ )        // Underline just what's needed

     off = expandtab(os,off,*s++,'-','-');

   if( i == len ) os << '^';     // Mark end of region

   os << '\n';                   // End of marked line

   return 0;                     // All done

 }

 //------------------------------print------------------------------------------

 //std::ostream& operator<< ( std::ostream& os, FileBuffRegion &br ) {

 ostream& operator<< ( ostream& os, FileBuffRegion &br ) {

   if( &br == NULL ) return os;  // The empty buffer region

   FileBuffRegion *brp = &br;    // Pointer to region

   while( brp ) {                // While have chained regions

     brp->print(os);             // Print region

     brp = brp->_next;           // Chain to next

   }

   return os;                    // Return final stream

 }

 //------------------------------print------------------------------------------

 // Print the FileBuffRegion to a stream. FileBuffRegions are printed with the

 // filename and line number to the left, and complete text lines to the right.

 // Selected portions (portions of a line actually in the FileBuffRegion are

 // underlined.  Ellipses are used for long multi-line regions.

 //void FileBuffRegion::print( std::ostream& os ) {

 void FileBuffRegion::print( ostream& os ) {

   if( !this ) return;           // Nothing to print

   char *s = _bfr->get_line();

   int skip = (int)(_offset - _sol);     // Amount to skip to start of data

   int len = printline( os, _bfr->_fp->_name, _line, s, skip, _length );

   if( !len ) return;                    // All done; exit

   // Here we require at least 2 lines

   int off1 = _length - len + skip;      // Length of line 1

   int off2 = off1 + _sol;               // Offset to start of line 2

   char *s2 = _bfr->get_line();           // Start of line 2

   char *s3 = strchr( s2, '\n' )+1;      // Start of line 3 (unread)

   if( len <= (s3-s2) ) {                // It all fits on the next line

     printline( os, _bfr->_fp->_name, _line+1, s2, -1, len ); // Print&underline

     return;

   }

   // Here we require at least 3 lines

   int off3 = off2 + (int)(s3-s2);       // Offset to start of line 3

   s3 = _bfr->get_line();                // Start of line 3 (read)

   const char *s4 = strchr( s3, '\n' )+1;// Start of line 4 (unread)

   if( len < (s4-s3) ) {                 // It all fits on the next 2 lines

     s2 = _bfr->get_line();

     len = printline( os, _bfr->_fp->_name, _line+1, s2, -1, len ); // Line 2

     s3 = _bfr->get_line();

     printline( os, _bfr->_fp->_name, _line+2, s3, -1, len );     // Line 3

     return;

   }

   // Here we require at least 4 lines.

   // Print only the 1st and last line, with ellipses in middle.

   os << "...\n";                // The ellipses

   int cline = _line+1;          // Skipped 2 lines

   do {                          // Do until find last line

     len -= (int)(s3-s2);        // Remove length of line

     cline++;                    // Next line

     s2 = _bfr->get_line();      // Get next line from end of this line

     s3 = strchr( s2, '\n' ) + 1;// Get end of next line

   } while( len > (s3-s2) );     // Repeat until last line

   printline( os, _bfr->_fp->_name, cline, s2, -1, len ); // Print & underline

 }

 //------------------------------file_error-------------------------------------

 void FileBuff::file_error(int flag, int linenum, const char *fmt, ...)

 {

   va_list args;

   va_start(args, fmt);

   switch (flag) {

   case 0: _AD._warnings += _AD.emit_msg(0, flag, linenum, fmt, args);

   case 1: _AD._syntax_errs += _AD.emit_msg(0, flag, linenum, fmt, args);

   case 2: _AD._semantic_errs += _AD.emit_msg(0, flag, linenum, fmt, args);

   default: assert(0, ""); break;

   }

   va_end(args);

   _AD._no_output = 1;

 }