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1 /* |
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2 * Copyright 1997-2002 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 * |
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23 */ |
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24 |
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25 // FILEBUFF.CPP - Routines for handling a parser file buffer |
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26 #include "adlc.hpp" |
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27 |
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28 //------------------------------FileBuff--------------------------------------- |
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29 // Create a new parsing buffer |
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30 FileBuff::FileBuff( BufferedFile *fptr, ArchDesc& archDesc) : _fp(fptr), _AD(archDesc) { |
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31 _err = fseek(_fp->_fp, 0, SEEK_END); // Seek to end of file |
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32 if (_err) { |
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33 file_error(SEMERR, 0, "File seek error reading input file"); |
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34 exit(1); // Exit on seek error |
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35 } |
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36 _filepos = ftell(_fp->_fp); // Find offset of end of file |
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37 _bufferSize = _filepos + 5; // Filepos points to last char, so add padding |
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38 _err = fseek(_fp->_fp, 0, SEEK_SET); // Reset to beginning of file |
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39 if (_err) { |
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40 file_error(SEMERR, 0, "File seek error reading input file\n"); |
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41 exit(1); // Exit on seek error |
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42 } |
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43 _filepos = ftell(_fp->_fp); // Reset current file position |
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44 |
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45 _bigbuf = new char[_bufferSize]; // Create buffer to hold text for parser |
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46 if( !_bigbuf ) { |
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47 file_error(SEMERR, 0, "Buffer allocation failed\n"); |
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48 exit(1); // Exit on allocation failure |
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49 } |
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50 *_bigbuf = '\n'; // Lead with a sentinal newline |
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51 _buf = _bigbuf+1; // Skip sentinal |
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52 _bufmax = _buf; // Buffer is empty |
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53 _bufeol = _bigbuf; // _bufeol points at sentinal |
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54 _filepos = -1; // filepos is in sync with _bufeol |
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55 _bufoff = _offset = 0L; // Offset at file start |
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56 |
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57 _bufmax += fread(_buf, 1, _bufferSize-2, _fp->_fp); // Fill buffer & set end value |
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58 if (_bufmax == _buf) { |
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59 file_error(SEMERR, 0, "File read error, no input read\n"); |
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60 exit(1); // Exit on read error |
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61 } |
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62 *_bufmax = '\n'; // End with a sentinal new-line |
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63 *(_bufmax+1) = '\0'; // Then end with a sentinal NULL |
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64 } |
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65 |
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66 //------------------------------~FileBuff-------------------------------------- |
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67 // Nuke the FileBuff |
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68 FileBuff::~FileBuff() { |
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69 delete _bigbuf; |
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70 } |
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71 |
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72 //------------------------------get_line---------------------------------------- |
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73 char *FileBuff::get_line(void) { |
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74 char *retval; |
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75 |
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76 // Check for end of file & return NULL |
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77 if (_bufeol >= _bufmax) return NULL; |
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78 |
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79 retval = ++_bufeol; // return character following end of previous line |
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80 if (*retval == '\0') return NULL; // Check for EOF sentinal |
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81 // Search for newline character which must end each line |
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82 for(_filepos++; *_bufeol != '\n'; _bufeol++) |
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83 _filepos++; // keep filepos in sync with _bufeol |
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84 // _bufeol & filepos point at end of current line, so return pointer to start |
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85 return retval; |
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86 } |
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87 |
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88 //------------------------------FileBuffRegion--------------------------------- |
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89 // Create a new region in a FileBuff. |
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90 FileBuffRegion::FileBuffRegion( FileBuff* bufr, int soln, int ln, |
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91 int off, int len) |
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92 : _bfr(bufr), _sol(soln), _line(ln), _offset(off), _length(len) { |
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93 _next = NULL; // No chained regions |
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94 } |
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95 |
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96 //------------------------------~FileBuffRegion-------------------------------- |
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97 // Delete the entire linked list of buffer regions. |
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98 FileBuffRegion::~FileBuffRegion() { |
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99 if( _next ) delete _next; |
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100 } |
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101 |
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102 //------------------------------copy------------------------------------------- |
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103 // Deep copy a FileBuffRegion |
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104 FileBuffRegion *FileBuffRegion::copy() { |
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105 if( !this ) return NULL; // The empty buffer region |
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106 FileBuffRegion *br = new FileBuffRegion(_bfr,_sol,_line,_offset,_length); |
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107 if( _next ) br->_next = _next->copy(); |
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108 return br; |
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109 } |
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110 |
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111 //------------------------------merge------------------------------------------ |
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112 // Merge another buffer region into this buffer region. Make overlapping areas |
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113 // become a single region. Remove (delete) the input FileBuffRegion. |
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114 // Since the buffer regions are sorted by file offset, this is a varient of a |
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115 // "sorted-merge" running in linear time. |
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116 FileBuffRegion *FileBuffRegion::merge( FileBuffRegion *br ) { |
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117 if( !br ) return this; // Merging nothing |
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118 if( !this ) return br; // Merging into nothing |
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119 |
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120 assert( _bfr == br->_bfr, "" ); // Check for pointer-equivalent buffers |
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121 |
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122 if( _offset < br->_offset ) { // "this" starts before "br" |
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123 if( _offset+_length < br->_offset ) { // "this" ends before "br" |
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124 if( _next ) _next->merge( br ); // Merge with remainder of list |
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125 else _next = br; // No more in this list; just append. |
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126 } else { // Regions overlap. |
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127 int l = br->_offset + br->_length - _offset; |
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128 if( l > _length ) _length = l; // Pick larger region |
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129 FileBuffRegion *nr = br->_next; // Get rest of region |
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130 br->_next = NULL; // Remove indication of rest of region |
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131 delete br; // Delete this region (it's been subsumed). |
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132 if( nr ) merge( nr ); // Merge with rest of region |
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133 } // End of if regions overlap or not. |
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134 } else { // "this" starts after "br" |
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135 if( br->_offset+br->_length < _offset ) { // "br" ends before "this" |
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136 FileBuffRegion *nr = new FileBuffRegion(_bfr,_sol,_line,_offset,_length); |
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137 nr->_next = _next; // Structure copy "this" guy to "nr" |
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138 *this = *br; // Structure copy "br" over "this". |
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139 br->_next = NULL; // Remove indication of rest of region |
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140 delete br; // Delete this region (it's been copied) |
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141 merge( nr ); // Finish merging |
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142 } else { // Regions overlap. |
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143 int l = _offset + _length - br->_offset; |
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144 if( l > _length ) _length = l; // Pick larger region |
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145 _offset = br->_offset; // Start with earlier region |
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146 _sol = br->_sol; // Also use earlier line start |
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147 _line = br->_line; // Also use earlier line |
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148 FileBuffRegion *nr = br->_next; // Get rest of region |
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149 br->_next = NULL; // Remove indication of rest of region |
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150 delete br; // Delete this region (it's been subsumed). |
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151 if( nr ) merge( nr ); // Merge with rest of region |
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152 } // End of if regions overlap or not. |
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153 } |
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154 return this; |
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155 } |
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156 |
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157 //------------------------------expandtab-------------------------------------- |
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158 static int expandtab( ostream &os, int off, char c, char fill1, char fill2 ) { |
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159 if( c == '\t' ) { // Tab? |
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160 do os << fill1; // Expand the tab; Output space |
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161 while( (++off) & 7 ); // Expand to tab stop |
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162 } else { // Normal character |
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163 os << fill2; // Display normal character |
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164 off++; // Increment "cursor" offset |
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165 } |
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166 return off; |
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167 } |
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168 |
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169 //------------------------------printline-------------------------------------- |
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170 // Print and highlite a region of a line. Return the amount of highliting left |
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171 // to do (i.e. highlite length minus length of line). |
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172 static int printline( ostream& os, const char *fname, int line, |
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173 const char *_sol, int skip, int len ) { |
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174 |
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175 // Display the entire tab-expanded line |
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176 os << fname << ":" << line << ": "; |
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177 const char *t = strchr(_sol,'\n')+1; // End of line |
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178 int off = 0; // Cursor offset for tab expansion |
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179 const char *s = _sol; // Nice string pointer |
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180 while( t-s ) { // Display whole line |
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181 char c = *s++; // Get next character to display |
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182 off = expandtab(os,off,c,' ',c); |
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183 } |
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184 |
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185 // Display the tab-expanded skippings before underlining. |
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186 os << fname << ":" << line << ": "; |
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187 off = 0; // Cursor offset for tab expansion |
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188 s = _sol; // Restart string pointer |
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189 |
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190 // Start underlining. |
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191 if( skip != -1 ) { // The no-start-indicating flag |
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192 const char *u = _sol+skip; // Amount to skip |
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193 while( u-s ) // Display skipped part |
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194 off = expandtab(os,off,*s++,' ',' '); |
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195 os << '^'; // Start region |
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196 off++; // Moved cursor |
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197 len--; // 1 less char to do |
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198 if( *s++ == '\t' ) // Starting character is a tab? |
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199 off = expandtab(os,off,'\t','-','^'); |
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200 } |
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201 |
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202 // Long region doesn't end on this line |
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203 int llen = (int)(t-s); // Length of line, minus what's already done |
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204 if( len > llen ) { // Doing entire rest of line? |
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205 while( t-s ) // Display rest of line |
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206 off = expandtab(os,off,*s++,'-','-'); |
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207 os << '\n'; // EOL |
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208 return len-llen; // Return what's not yet done. |
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209 } |
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210 |
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211 // Region does end on this line. This code fails subtly if the region ends |
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212 // in a tab character. |
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213 int i; |
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214 for( i=1; i<len; i++ ) // Underline just what's needed |
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215 off = expandtab(os,off,*s++,'-','-'); |
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216 if( i == len ) os << '^'; // Mark end of region |
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217 os << '\n'; // End of marked line |
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218 return 0L; // All done |
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219 } |
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220 |
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221 //------------------------------print------------------------------------------ |
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222 //std::ostream& operator<< ( std::ostream& os, FileBuffRegion &br ) { |
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223 ostream& operator<< ( ostream& os, FileBuffRegion &br ) { |
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224 if( &br == NULL ) return os; // The empty buffer region |
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225 FileBuffRegion *brp = &br; // Pointer to region |
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226 while( brp ) { // While have chained regions |
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227 brp->print(os); // Print region |
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228 brp = brp->_next; // Chain to next |
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229 } |
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230 return os; // Return final stream |
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231 } |
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232 |
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233 //------------------------------print------------------------------------------ |
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234 // Print the FileBuffRegion to a stream. FileBuffRegions are printed with the |
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235 // filename and line number to the left, and complete text lines to the right. |
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236 // Selected portions (portions of a line actually in the FileBuffRegion are |
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237 // underlined. Ellipses are used for long multi-line regions. |
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238 //void FileBuffRegion::print( std::ostream& os ) { |
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239 void FileBuffRegion::print( ostream& os ) { |
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240 if( !this ) return; // Nothing to print |
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241 char *s = _bfr->get_line(); |
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242 int skip = (int)(_offset - _sol); // Amount to skip to start of data |
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243 int len = printline( os, _bfr->_fp->_name, _line, s, skip, _length ); |
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244 |
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245 if( !len ) return; // All done; exit |
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246 |
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247 // Here we require at least 2 lines |
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248 int off1 = _length - len + skip; // Length of line 1 |
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249 int off2 = off1 + _sol; // Offset to start of line 2 |
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250 char *s2 = _bfr->get_line(); // Start of line 2 |
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251 char *s3 = strchr( s2, '\n' )+1; // Start of line 3 (unread) |
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252 if( len <= (s3-s2) ) { // It all fits on the next line |
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253 printline( os, _bfr->_fp->_name, _line+1, s2, -1, len ); // Print&underline |
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254 return; |
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255 } |
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256 |
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257 // Here we require at least 3 lines |
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258 int off3 = off2 + (int)(s3-s2); // Offset to start of line 3 |
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259 s3 = _bfr->get_line(); // Start of line 3 (read) |
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260 const char *s4 = strchr( s3, '\n' )+1;// Start of line 4 (unread) |
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261 if( len < (s4-s3) ) { // It all fits on the next 2 lines |
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262 s2 = _bfr->get_line(); |
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263 len = printline( os, _bfr->_fp->_name, _line+1, s2, -1, len ); // Line 2 |
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264 s3 = _bfr->get_line(); |
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265 printline( os, _bfr->_fp->_name, _line+2, s3, -1, len ); // Line 3 |
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266 return; |
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267 } |
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268 |
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269 // Here we require at least 4 lines. |
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270 // Print only the 1st and last line, with ellipses in middle. |
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271 os << "...\n"; // The ellipses |
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272 int cline = _line+1; // Skipped 2 lines |
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273 do { // Do until find last line |
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274 len -= (int)(s3-s2); // Remove length of line |
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275 cline++; // Next line |
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276 s2 = _bfr->get_line(); // Get next line from end of this line |
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277 s3 = strchr( s2, '\n' ) + 1;// Get end of next line |
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278 } while( len > (s3-s2) ); // Repeat until last line |
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279 printline( os, _bfr->_fp->_name, cline, s2, -1, len ); // Print & underline |
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280 } |
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281 |
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282 //------------------------------file_error------------------------------------- |
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283 void FileBuff::file_error(int flag, int linenum, const char *fmt, ...) |
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284 { |
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285 va_list args; |
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286 |
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287 va_start(args, fmt); |
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288 switch (flag) { |
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289 case 0: _AD._warnings += _AD.emit_msg(0, flag, linenum, fmt, args); |
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290 case 1: _AD._syntax_errs += _AD.emit_msg(0, flag, linenum, fmt, args); |
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291 case 2: _AD._semantic_errs += _AD.emit_msg(0, flag, linenum, fmt, args); |
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292 default: assert(0, ""); break; |
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293 } |
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294 va_end(args); |
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295 _AD._no_output = 1; |
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296 } |