rlcodegen/javacodegen.cpp

   1 /*
   2  *  Copyright 2006 Adrian Thurston <thurston@cs.queensu.ca>
   3  */
   4
   5 /*  This file is part of Ragel.
   6  *
   7  *  Ragel is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  Ragel is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with Ragel; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "javacodegen.h"
  23 #include "rlcodegen.h"
  24 #include "tabcodegen.h"
  25 #include "redfsm.h"
  26 #include "gendata.h"
  27
  28 void JavaTabCodeGen::GOTO( ostream &ret, int gotoDest, bool inFinish )
  29 {
  30         ret << "{" << CS() << " = " << gotoDest << "; " <<
  31                         CTRL_FLOW() << "break _again;}";
  32 }
  33
  34 void JavaTabCodeGen::GOTO_EXPR( ostream &ret, InlineItem *ilItem, bool inFinish )
  35 {
  36         ret << "{" << CS() << " = (";
  37         INLINE_LIST( ret, ilItem->children, 0, inFinish );
  38         ret << "); " << CTRL_FLOW() << "break _again;}";
  39 }
  40
  41 void JavaTabCodeGen::CALL( ostream &ret, int callDest, int targState, bool inFinish )
  42 {
  43         ret << "{" << STACK() << "[" << TOP() << "++] = " << CS() << "; " << CS() << " = " <<
  44                         callDest << "; " << CTRL_FLOW() << "break _again;}";
  45 }
  46
  47 void JavaTabCodeGen::CALL_EXPR( ostream &ret, InlineItem *ilItem, int targState, bool inFinish )
  48 {
  49         ret << "{" << STACK() << "[" << TOP() << "++] = " << CS() << "; " << CS() << " = (";
  50         INLINE_LIST( ret, ilItem->children, targState, inFinish );
  51         ret << "); " << CTRL_FLOW() << "break _again;}";
  52 }
  53
  54 void JavaTabCodeGen::RET( ostream &ret, bool inFinish )
  55 {
  56         ret << "{" << CS() << " = " << STACK() << "[--" << TOP()
  57                         << "]; " << CTRL_FLOW() << "break _again;}";
  58 }
  59
  60 void JavaTabCodeGen::BREAK( ostream &ret, int targState )
  61 {
  62         ret << CTRL_FLOW() << "break _resume;";
  63 }
  64
  65 void JavaTabCodeGen::COND_TRANSLATE()
  66 {
  67         out <<
  68                 "       _widec = " << GET_KEY() << ";\n"
  69                 "       _keys = " << CO() << "[" << CS() << "]*2\n;"
  70                 "       _klen = " << CL() << "[" << CS() << "];\n"
  71                 "       if ( _klen > 0 ) {\n"
  72                 "               int _lower = _keys\n;"
  73                 "               int _mid;\n"
  74                 "               int _upper = _keys + (_klen<<1) - 2;\n"
  75                 "               while (true) {\n"
  76                 "                       if ( _upper < _lower )\n"
  77                 "                               break;\n"
  78                 "\n"
  79                 "                       _mid = _lower + (((_upper-_lower) >> 1) & ~1);\n"
  80                 "                       if ( " << GET_WIDE_KEY() << " < " << CK() << "[_mid] )\n"
  81                 "                               _upper = _mid - 2;\n"
  82                 "                       else if ( " << GET_WIDE_KEY() << " > " << CK() << "[_mid] )\n"
  83                 "                               _lower = _mid + 2;\n"
  84                 "                       else {\n"
  85                 "                               switch ( " << C() << "[" << CO() << "[" << CS() << "]"
  86                                                         " + ((_mid - _keys)>>1)] ) {\n"
  87                 ;
  88
  89         for ( CondSpaceList::Iter csi = cgd->condSpaceList; csi.lte(); csi++ ) {
  90                 CondSpace *condSpace = csi;
  91                 out << "        case " << condSpace->condSpaceId << ": {\n";
  92                 out << TABS(2) << "_widec = " << KEY(condSpace->baseKey) <<
  93                                 " + (" << GET_KEY() << " - " << KEY(keyOps->minKey) << ");\n";
  94
  95                 for ( CondSet::Iter csi = condSpace->condSet; csi.lte(); csi++ ) {
  96                         out << TABS(2) << "if ( ";
  97                         CONDITION( out, *csi );
  98                         Size condValOffset = ((1 << csi.pos()) * keyOps->alphSize());
  99                         out << " ) _widec += " << condValOffset << ";\n";
 100                 }
 101
 102                 out <<
 103                         "               break;\n"
 104                         "       }\n";
 105         }
 106
 107         out <<
 108                 "                               }\n"
 109                 "                               break;\n"
 110                 "                       }\n"
 111                 "               }\n"
 112                 "       }\n"
 113                 "\n";
 114 }
 115
 116
 117 void JavaTabCodeGen::LOCATE_TRANS()
 118 {
 119         out <<
 120                 "       _match: do {\n"
 121                 "       _keys = " << KO() << "[" << CS() << "]" << ";\n"
 122                 "       _trans = " << IO() << "[" << CS() << "];\n"
 123                 "       _klen = " << SL() << "[" << CS() << "];\n"
 124                 "       if ( _klen > 0 ) {\n"
 125                 "               int _lower = _keys;\n"
 126                 "               int _mid;\n"
 127                 "               int _upper = _keys + _klen - 1;\n"
 128                 "               while (true) {\n"
 129                 "                       if ( _upper < _lower )\n"
 130                 "                               break;\n"
 131                 "\n"
 132                 "                       _mid = _lower + ((_upper-_lower) >> 1);\n"
 133                 "                       if ( " << GET_WIDE_KEY() << " < " << K() << "[_mid] )\n"
 134                 "                               _upper = _mid - 1;\n"
 135                 "                       else if ( " << GET_WIDE_KEY() << " > " << K() << "[_mid] )\n"
 136                 "                               _lower = _mid + 1;\n"
 137                 "                       else {\n"
 138                 "                               _trans += (_mid - _keys);\n"
 139                 "                               break _match;\n"
 140                 "                       }\n"
 141                 "               }\n"
 142                 "               _keys += _klen;\n"
 143                 "               _trans += _klen;\n"
 144                 "       }\n"
 145                 "\n"
 146                 "       _klen = " << RL() << "[" << CS() << "];\n"
 147                 "       if ( _klen > 0 ) {\n"
 148                 "               int _lower = _keys;\n"
 149                 "               int _mid;\n"
 150                 "               int _upper = _keys + (_klen<<1) - 2;\n"
 151                 "               while (true) {\n"
 152                 "                       if ( _upper < _lower )\n"
 153                 "                               break;\n"
 154                 "\n"
 155                 "                       _mid = _lower + (((_upper-_lower) >> 1) & ~1);\n"
 156                 "                       if ( " << GET_WIDE_KEY() << " < " << K() << "[_mid] )\n"
 157                 "                               _upper = _mid - 2;\n"
 158                 "                       else if ( " << GET_WIDE_KEY() << " > " << K() << "[_mid+1] )\n"
 159                 "                               _lower = _mid + 2;\n"
 160                 "                       else {\n"
 161                 "                               _trans += ((_mid - _keys)>>1);\n"
 162                 "                               break _match;\n"
 163                 "                       }\n"
 164                 "               }\n"
 165                 "               _trans += _klen;\n"
 166                 "       }\n"
 167                 "       } while (false);\n"
 168                 "\n";
 169 }
 170
 171 void JavaTabCodeGen::writeOutExec()
 172 {
 173         out <<
 174                 "       {\n"
 175                 "       int _klen";
 176
 177         if ( anyRegCurStateRef() )
 178                 out << ", _ps";
 179
 180         out <<
 181                 ";\n"
 182                 "       int _trans;\n";
 183
 184         if ( anyConditions() )
 185                 out << "        int _widec;\n";
 186
 187         if ( anyToStateActions() || anyRegActions() || anyFromStateActions() ) {
 188                 out <<
 189                         "       int _acts;\n"
 190                         "       int _nacts;\n";
 191         }
 192
 193         out <<
 194                 "       int _keys;\n"
 195                 "\n";
 196
 197         if ( cgd->hasEnd )
 198                 out << "        if ( " << P() << " != " << PE() << " ) {\n";
 199
 200         out << "        _resume: while ( true ) {\n";
 201
 202         out << "        _again: do {\n";
 203
 204         if ( redFsm->errState != 0 ) {
 205                 out <<
 206                         "       if ( " << CS() << " == " << redFsm->errState->id << " )\n"
 207                         "               break _resume;\n";
 208         }
 209
 210         if ( anyFromStateActions() ) {
 211                 out <<
 212                         "       _acts = " << FSA() << "[" << CS() << "]" << ";\n"
 213                         "       _nacts = " << CAST("int") << " " << A() << "[_acts++];\n"
 214                         "       while ( _nacts-- > 0 ) {\n"
 215                         "               switch ( " << A() << "[_acts++] ) {\n";
 216                         FROM_STATE_ACTION_SWITCH();
 217                         SWITCH_DEFAULT() <<
 218                         "               }\n"
 219                         "       }\n"
 220                         "\n";
 221         }
 222
 223         if ( anyConditions() )
 224                 COND_TRANSLATE();
 225
 226         LOCATE_TRANS();
 227
 228         if ( anyRegCurStateRef() )
 229                 out << "        _ps = " << CS() << ";\n";
 230
 231         if ( useIndicies )
 232                 out << "        _trans = " << I() << "[_trans];\n";
 233
 234         out <<
 235                 "       " << CS() << " = " << TT() << "[_trans];\n"
 236                 "\n";
 237
 238         if ( anyRegActions() ) {
 239                 out <<
 240                         "       if ( " << TA() << "[_trans] == 0 )\n"
 241                         "               break _again;\n"
 242                         "\n"
 243                         "       _acts = " <<  TA() << "[_trans]" << ";\n"
 244                         "       _nacts = " << CAST("int") << " " <<  A() << "[_acts++];\n"
 245                         "       while ( _nacts-- > 0 )\n        {\n"
 246                         "               switch ( " << A() << "[_acts++] )\n"
 247                         "               {\n";
 248                         ACTION_SWITCH();
 249                         SWITCH_DEFAULT() <<
 250                         "               }\n"
 251                         "       }\n"
 252                         "\n";
 253         }
 254
 255         /* Again loop, functions as again label. */
 256         out << "        } while (false);\n";
 257
 258         if ( anyToStateActions() ) {
 259                 out <<
 260                         "       _acts = " << TSA() << "[" << CS() << "]" << ";\n"
 261                         "       _nacts = " << CAST("int") << " " << A() << "[_acts++];\n"
 262                         "       while ( _nacts-- > 0 ) {\n"
 263                         "               switch ( " << A() << "[_acts++] ) {\n";
 264                         TO_STATE_ACTION_SWITCH();
 265                         SWITCH_DEFAULT() <<
 266                         "               }\n"
 267                         "       }\n"
 268                         "\n";
 269         }
 270
 271         if ( cgd->hasEnd ) {
 272                 out <<
 273                         "       if ( ++" << P() << " == " << PE() << " )\n"
 274                         "               break _resume;\n";
 275         }
 276         else {
 277                 out <<
 278                         "       " << P() << " += 1;\n";
 279         }
 280
 281         /* Close the resume loop. */
 282         out << "        }\n";
 283
 284         /* The if guarding on empty string. */
 285         if ( cgd->hasEnd )
 286                 out << "        }\n";
 287
 288         /* The execute block. */
 289         out << "        }\n";
 290 }
 291
 292 void JavaTabCodeGen::writeOutEOF()
 293 {
 294         if ( anyEofActions() ) {
 295                 out <<
 296                         "       int _acts = " << EA() << "[" << CS() << "]" << ";\n"
 297                         "       int _nacts = " << CAST("int") << " " << A() << "[_acts++];\n"
 298                         "       while ( _nacts-- > 0 ) {\n"
 299                         "               switch ( " << A() << "[_acts++] ) {\n";
 300                         EOF_ACTION_SWITCH();
 301                         SWITCH_DEFAULT() <<
 302                         "               }\n"
 303                         "       }\n"
 304                         "\n";
 305         }
 306 }
 307