Mercurial > hg > truffle
annotate src/share/vm/adlc/filebuff.cpp @ 14517:3812c088b945
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author | lana |
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 // FILEBUFF.CPP - Routines for handling a parser file buffer | |
26 #include "adlc.hpp" | |
27 | |
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28 using namespace std; |
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29 |
0 | 30 //------------------------------FileBuff--------------------------------------- |
31 // Create a new parsing buffer | |
32 FileBuff::FileBuff( BufferedFile *fptr, ArchDesc& archDesc) : _fp(fptr), _AD(archDesc) { | |
33 _err = fseek(_fp->_fp, 0, SEEK_END); // Seek to end of file | |
34 if (_err) { | |
35 file_error(SEMERR, 0, "File seek error reading input file"); | |
36 exit(1); // Exit on seek error | |
37 } | |
38 _filepos = ftell(_fp->_fp); // Find offset of end of file | |
39 _bufferSize = _filepos + 5; // Filepos points to last char, so add padding | |
40 _err = fseek(_fp->_fp, 0, SEEK_SET); // Reset to beginning of file | |
41 if (_err) { | |
42 file_error(SEMERR, 0, "File seek error reading input file\n"); | |
43 exit(1); // Exit on seek error | |
44 } | |
45 _filepos = ftell(_fp->_fp); // Reset current file position | |
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46 _linenum = 0; |
0 | 47 |
48 _bigbuf = new char[_bufferSize]; // Create buffer to hold text for parser | |
49 if( !_bigbuf ) { | |
50 file_error(SEMERR, 0, "Buffer allocation failed\n"); | |
51 exit(1); // Exit on allocation failure | |
52 } | |
605 | 53 *_bigbuf = '\n'; // Lead with a sentinel newline |
54 _buf = _bigbuf+1; // Skip sentinel | |
0 | 55 _bufmax = _buf; // Buffer is empty |
605 | 56 _bufeol = _bigbuf; // _bufeol points at sentinel |
0 | 57 _filepos = -1; // filepos is in sync with _bufeol |
58 _bufoff = _offset = 0L; // Offset at file start | |
59 | |
60 _bufmax += fread(_buf, 1, _bufferSize-2, _fp->_fp); // Fill buffer & set end value | |
61 if (_bufmax == _buf) { | |
62 file_error(SEMERR, 0, "File read error, no input read\n"); | |
63 exit(1); // Exit on read error | |
64 } | |
605 | 65 *_bufmax = '\n'; // End with a sentinel new-line |
66 *(_bufmax+1) = '\0'; // Then end with a sentinel NULL | |
0 | 67 } |
68 | |
69 //------------------------------~FileBuff-------------------------------------- | |
70 // Nuke the FileBuff | |
71 FileBuff::~FileBuff() { | |
72 delete _bigbuf; | |
73 } | |
74 | |
75 //------------------------------get_line---------------------------------------- | |
76 char *FileBuff::get_line(void) { | |
77 char *retval; | |
78 | |
79 // Check for end of file & return NULL | |
80 if (_bufeol >= _bufmax) return NULL; | |
81 | |
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82 _linenum++; |
0 | 83 retval = ++_bufeol; // return character following end of previous line |
605 | 84 if (*retval == '\0') return NULL; // Check for EOF sentinel |
0 | 85 // Search for newline character which must end each line |
86 for(_filepos++; *_bufeol != '\n'; _bufeol++) | |
87 _filepos++; // keep filepos in sync with _bufeol | |
88 // _bufeol & filepos point at end of current line, so return pointer to start | |
89 return retval; | |
90 } | |
91 | |
92 //------------------------------FileBuffRegion--------------------------------- | |
93 // Create a new region in a FileBuff. | |
94 FileBuffRegion::FileBuffRegion( FileBuff* bufr, int soln, int ln, | |
95 int off, int len) | |
96 : _bfr(bufr), _sol(soln), _line(ln), _offset(off), _length(len) { | |
97 _next = NULL; // No chained regions | |
98 } | |
99 | |
100 //------------------------------~FileBuffRegion-------------------------------- | |
101 // Delete the entire linked list of buffer regions. | |
102 FileBuffRegion::~FileBuffRegion() { | |
103 if( _next ) delete _next; | |
104 } | |
105 | |
106 //------------------------------copy------------------------------------------- | |
107 // Deep copy a FileBuffRegion | |
108 FileBuffRegion *FileBuffRegion::copy() { | |
109 if( !this ) return NULL; // The empty buffer region | |
110 FileBuffRegion *br = new FileBuffRegion(_bfr,_sol,_line,_offset,_length); | |
111 if( _next ) br->_next = _next->copy(); | |
112 return br; | |
113 } | |
114 | |
115 //------------------------------merge------------------------------------------ | |
116 // Merge another buffer region into this buffer region. Make overlapping areas | |
117 // become a single region. Remove (delete) the input FileBuffRegion. | |
118 // Since the buffer regions are sorted by file offset, this is a varient of a | |
119 // "sorted-merge" running in linear time. | |
120 FileBuffRegion *FileBuffRegion::merge( FileBuffRegion *br ) { | |
121 if( !br ) return this; // Merging nothing | |
122 if( !this ) return br; // Merging into nothing | |
123 | |
124 assert( _bfr == br->_bfr, "" ); // Check for pointer-equivalent buffers | |
125 | |
126 if( _offset < br->_offset ) { // "this" starts before "br" | |
127 if( _offset+_length < br->_offset ) { // "this" ends before "br" | |
128 if( _next ) _next->merge( br ); // Merge with remainder of list | |
129 else _next = br; // No more in this list; just append. | |
130 } else { // Regions overlap. | |
131 int l = br->_offset + br->_length - _offset; | |
132 if( l > _length ) _length = l; // Pick larger region | |
133 FileBuffRegion *nr = br->_next; // Get rest of region | |
134 br->_next = NULL; // Remove indication of rest of region | |
135 delete br; // Delete this region (it's been subsumed). | |
136 if( nr ) merge( nr ); // Merge with rest of region | |
137 } // End of if regions overlap or not. | |
138 } else { // "this" starts after "br" | |
139 if( br->_offset+br->_length < _offset ) { // "br" ends before "this" | |
140 FileBuffRegion *nr = new FileBuffRegion(_bfr,_sol,_line,_offset,_length); | |
141 nr->_next = _next; // Structure copy "this" guy to "nr" | |
142 *this = *br; // Structure copy "br" over "this". | |
143 br->_next = NULL; // Remove indication of rest of region | |
144 delete br; // Delete this region (it's been copied) | |
145 merge( nr ); // Finish merging | |
146 } else { // Regions overlap. | |
147 int l = _offset + _length - br->_offset; | |
148 if( l > _length ) _length = l; // Pick larger region | |
149 _offset = br->_offset; // Start with earlier region | |
150 _sol = br->_sol; // Also use earlier line start | |
151 _line = br->_line; // Also use earlier line | |
152 FileBuffRegion *nr = br->_next; // Get rest of region | |
153 br->_next = NULL; // Remove indication of rest of region | |
154 delete br; // Delete this region (it's been subsumed). | |
155 if( nr ) merge( nr ); // Merge with rest of region | |
156 } // End of if regions overlap or not. | |
157 } | |
158 return this; | |
159 } | |
160 | |
161 //------------------------------expandtab-------------------------------------- | |
162 static int expandtab( ostream &os, int off, char c, char fill1, char fill2 ) { | |
163 if( c == '\t' ) { // Tab? | |
164 do os << fill1; // Expand the tab; Output space | |
165 while( (++off) & 7 ); // Expand to tab stop | |
166 } else { // Normal character | |
167 os << fill2; // Display normal character | |
168 off++; // Increment "cursor" offset | |
169 } | |
170 return off; | |
171 } | |
172 | |
173 //------------------------------printline-------------------------------------- | |
174 // Print and highlite a region of a line. Return the amount of highliting left | |
175 // to do (i.e. highlite length minus length of line). | |
176 static int printline( ostream& os, const char *fname, int line, | |
177 const char *_sol, int skip, int len ) { | |
178 | |
179 // Display the entire tab-expanded line | |
180 os << fname << ":" << line << ": "; | |
181 const char *t = strchr(_sol,'\n')+1; // End of line | |
182 int off = 0; // Cursor offset for tab expansion | |
183 const char *s = _sol; // Nice string pointer | |
184 while( t-s ) { // Display whole line | |
185 char c = *s++; // Get next character to display | |
186 off = expandtab(os,off,c,' ',c); | |
187 } | |
188 | |
189 // Display the tab-expanded skippings before underlining. | |
190 os << fname << ":" << line << ": "; | |
191 off = 0; // Cursor offset for tab expansion | |
192 s = _sol; // Restart string pointer | |
193 | |
194 // Start underlining. | |
195 if( skip != -1 ) { // The no-start-indicating flag | |
196 const char *u = _sol+skip; // Amount to skip | |
197 while( u-s ) // Display skipped part | |
198 off = expandtab(os,off,*s++,' ',' '); | |
199 os << '^'; // Start region | |
200 off++; // Moved cursor | |
201 len--; // 1 less char to do | |
202 if( *s++ == '\t' ) // Starting character is a tab? | |
203 off = expandtab(os,off,'\t','-','^'); | |
204 } | |
205 | |
206 // Long region doesn't end on this line | |
207 int llen = (int)(t-s); // Length of line, minus what's already done | |
208 if( len > llen ) { // Doing entire rest of line? | |
209 while( t-s ) // Display rest of line | |
210 off = expandtab(os,off,*s++,'-','-'); | |
211 os << '\n'; // EOL | |
212 return len-llen; // Return what's not yet done. | |
213 } | |
214 | |
215 // Region does end on this line. This code fails subtly if the region ends | |
216 // in a tab character. | |
217 int i; | |
218 for( i=1; i<len; i++ ) // Underline just what's needed | |
219 off = expandtab(os,off,*s++,'-','-'); | |
220 if( i == len ) os << '^'; // Mark end of region | |
221 os << '\n'; // End of marked line | |
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222 return 0; // All done |
0 | 223 } |
224 | |
225 //------------------------------print------------------------------------------ | |
226 //std::ostream& operator<< ( std::ostream& os, FileBuffRegion &br ) { | |
227 ostream& operator<< ( ostream& os, FileBuffRegion &br ) { | |
228 if( &br == NULL ) return os; // The empty buffer region | |
229 FileBuffRegion *brp = &br; // Pointer to region | |
230 while( brp ) { // While have chained regions | |
231 brp->print(os); // Print region | |
232 brp = brp->_next; // Chain to next | |
233 } | |
234 return os; // Return final stream | |
235 } | |
236 | |
237 //------------------------------print------------------------------------------ | |
238 // Print the FileBuffRegion to a stream. FileBuffRegions are printed with the | |
239 // filename and line number to the left, and complete text lines to the right. | |
240 // Selected portions (portions of a line actually in the FileBuffRegion are | |
241 // underlined. Ellipses are used for long multi-line regions. | |
242 //void FileBuffRegion::print( std::ostream& os ) { | |
243 void FileBuffRegion::print( ostream& os ) { | |
244 if( !this ) return; // Nothing to print | |
245 char *s = _bfr->get_line(); | |
246 int skip = (int)(_offset - _sol); // Amount to skip to start of data | |
247 int len = printline( os, _bfr->_fp->_name, _line, s, skip, _length ); | |
248 | |
249 if( !len ) return; // All done; exit | |
250 | |
251 // Here we require at least 2 lines | |
252 int off1 = _length - len + skip; // Length of line 1 | |
253 int off2 = off1 + _sol; // Offset to start of line 2 | |
254 char *s2 = _bfr->get_line(); // Start of line 2 | |
255 char *s3 = strchr( s2, '\n' )+1; // Start of line 3 (unread) | |
256 if( len <= (s3-s2) ) { // It all fits on the next line | |
257 printline( os, _bfr->_fp->_name, _line+1, s2, -1, len ); // Print&underline | |
258 return; | |
259 } | |
260 | |
261 // Here we require at least 3 lines | |
262 int off3 = off2 + (int)(s3-s2); // Offset to start of line 3 | |
263 s3 = _bfr->get_line(); // Start of line 3 (read) | |
264 const char *s4 = strchr( s3, '\n' )+1;// Start of line 4 (unread) | |
265 if( len < (s4-s3) ) { // It all fits on the next 2 lines | |
266 s2 = _bfr->get_line(); | |
267 len = printline( os, _bfr->_fp->_name, _line+1, s2, -1, len ); // Line 2 | |
268 s3 = _bfr->get_line(); | |
269 printline( os, _bfr->_fp->_name, _line+2, s3, -1, len ); // Line 3 | |
270 return; | |
271 } | |
272 | |
273 // Here we require at least 4 lines. | |
274 // Print only the 1st and last line, with ellipses in middle. | |
275 os << "...\n"; // The ellipses | |
276 int cline = _line+1; // Skipped 2 lines | |
277 do { // Do until find last line | |
278 len -= (int)(s3-s2); // Remove length of line | |
279 cline++; // Next line | |
280 s2 = _bfr->get_line(); // Get next line from end of this line | |
281 s3 = strchr( s2, '\n' ) + 1;// Get end of next line | |
282 } while( len > (s3-s2) ); // Repeat until last line | |
283 printline( os, _bfr->_fp->_name, cline, s2, -1, len ); // Print & underline | |
284 } | |
285 | |
286 //------------------------------file_error------------------------------------- | |
287 void FileBuff::file_error(int flag, int linenum, const char *fmt, ...) | |
288 { | |
289 va_list args; | |
290 | |
291 va_start(args, fmt); | |
292 switch (flag) { | |
293 case 0: _AD._warnings += _AD.emit_msg(0, flag, linenum, fmt, args); | |
294 case 1: _AD._syntax_errs += _AD.emit_msg(0, flag, linenum, fmt, args); | |
295 case 2: _AD._semantic_errs += _AD.emit_msg(0, flag, linenum, fmt, args); | |
296 default: assert(0, ""); break; | |
297 } | |
298 va_end(args); | |
299 _AD._no_output = 1; | |
300 } |