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Diffstat (limited to 'src/fsmexec.cc')
| -rw-r--r-- | src/fsmexec.cc | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/fsmexec.cc b/src/fsmexec.cc new file mode 100644 index 0000000..bec899f --- /dev/null +++ b/src/fsmexec.cc @@ -0,0 +1,223 @@ +/* + * Copyright 2007-2012 Adrian Thurston <thurston@complang.org> + */ + +/* This file is part of Colm. + * + * Colm is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Colm 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 for more details. + * + * You should have received a copy of the GNU General Public License + * along with Colm; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <string.h> +#include <iostream> + +#include "config.h" +#include "defs.h" +#include "redfsm.h" +#include "parsedata.h" +#include "parsetree.h" +#include "pdarun.h" +#include "global.h" + +void execAction( FsmRun *fsmRun, GenAction *genAction ) +{ + for ( InlineList::Iter item = *genAction->inlineList; item.lte(); item++ ) { + switch ( item->type ) { + case InlineItem::Text: + assert(false); + break; + case InlineItem::LmSetActId: + fsmRun->act = item->longestMatchPart->longestMatchId; + break; + case InlineItem::LmSetTokEnd: + fsmRun->tokend = fsmRun->toklen + ( fsmRun->p - fsmRun->start ) + 1; + break; + case InlineItem::LmInitTokStart: + assert(false); + break; + case InlineItem::LmInitAct: + fsmRun->act = 0; + break; + case InlineItem::LmSetTokStart: + fsmRun->tokstart = fsmRun->p; + break; + case InlineItem::LmSwitch: + /* If the switch handles error then we also forced the error state. It + * will exist. */ + fsmRun->toklen = fsmRun->tokend; + if ( item->tokenRegion->lmSwitchHandlesError && fsmRun->act == 0 ) { + fsmRun->cs = fsmRun->tables->errorState; + } + else { + for ( TokenInstanceListReg::Iter lmi = item->tokenRegion->tokenInstanceList; + lmi.lte(); lmi++ ) + { + if ( lmi->inLmSelect && fsmRun->act == lmi->longestMatchId ) + fsmRun->matchedToken = lmi->tokenDef->tdLangEl->id; + } + } + fsmRun->returnResult = true; + fsmRun->skipToklen = true; + break; + case InlineItem::LmOnLast: + fsmRun->p += 1; + fsmRun->matchedToken = item->longestMatchPart->tokenDef->tdLangEl->id; + fsmRun->returnResult = true; + break; + case InlineItem::LmOnNext: + fsmRun->matchedToken = item->longestMatchPart->tokenDef->tdLangEl->id; + fsmRun->returnResult = true; + break; + case InlineItem::LmOnLagBehind: + fsmRun->toklen = fsmRun->tokend; + fsmRun->matchedToken = item->longestMatchPart->tokenDef->tdLangEl->id; + fsmRun->returnResult = true; + fsmRun->skipToklen = true; + break; + } + } + + if ( genAction->markType == MarkMark ) + fsmRun->mark[genAction->markId-1] = fsmRun->p; +} + +extern "C" void internalFsmExecute( FsmRun *fsmRun, StreamImpl *inputStream ) +{ + int _klen; + unsigned int _trans; + const long *_acts; + unsigned int _nacts; + const char *_keys; + + fsmRun->start = fsmRun->p; + + /* Init the token match to nothing (the sentinal). */ + fsmRun->matchedToken = 0; + +/*_resume:*/ + if ( fsmRun->cs == fsmRun->tables->errorState ) + goto out; + + if ( fsmRun->p == fsmRun->pe ) + goto out; + +_loop_head: + _acts = fsmRun->tables->actions + fsmRun->tables->fromStateActions[fsmRun->cs]; + _nacts = (unsigned int) *_acts++; + while ( _nacts-- > 0 ) + execAction( fsmRun, fsmRun->tables->actionSwitch[*_acts++] ); + + _keys = fsmRun->tables->transKeys + fsmRun->tables->keyOffsets[fsmRun->cs]; + _trans = fsmRun->tables->indexOffsets[fsmRun->cs]; + + _klen = fsmRun->tables->singleLengths[fsmRun->cs]; + if ( _klen > 0 ) { + const char *_lower = _keys; + const char *_mid; + const char *_upper = _keys + _klen - 1; + while (1) { + if ( _upper < _lower ) + break; + + _mid = _lower + ((_upper-_lower) >> 1); + if ( (*fsmRun->p) < *_mid ) + _upper = _mid - 1; + else if ( (*fsmRun->p) > *_mid ) + _lower = _mid + 1; + else { + _trans += (_mid - _keys); + goto _match; + } + } + _keys += _klen; + _trans += _klen; + } + + _klen = fsmRun->tables->rangeLengths[fsmRun->cs]; + if ( _klen > 0 ) { + const char *_lower = _keys; + const char *_mid; + const char *_upper = _keys + (_klen<<1) - 2; + while (1) { + if ( _upper < _lower ) + break; + + _mid = _lower + (((_upper-_lower) >> 1) & ~1); + if ( (*fsmRun->p) < _mid[0] ) + _upper = _mid - 2; + else if ( (*fsmRun->p) > _mid[1] ) + _lower = _mid + 2; + else { + _trans += ((_mid - _keys)>>1); + goto _match; + } + } + _trans += _klen; + } + +_match: + fsmRun->cs = fsmRun->tables->transTargsWI[_trans]; + + if ( fsmRun->tables->transActionsWI[_trans] == 0 ) + goto _again; + + fsmRun->returnResult = false; + fsmRun->skipToklen = false; + _acts = fsmRun->tables->actions + fsmRun->tables->transActionsWI[_trans]; + _nacts = (unsigned int) *_acts++; + while ( _nacts-- > 0 ) + execAction( fsmRun, fsmRun->tables->actionSwitch[*_acts++] ); + if ( fsmRun->returnResult ) { + if ( fsmRun->skipToklen ) + goto skip_toklen; + goto final; + } + +_again: + _acts = fsmRun->tables->actions + fsmRun->tables->toStateActions[fsmRun->cs]; + _nacts = (unsigned int) *_acts++; + while ( _nacts-- > 0 ) + execAction( fsmRun, fsmRun->tables->actionSwitch[*_acts++] ); + + if ( fsmRun->cs == fsmRun->tables->errorState ) + goto out; + + if ( ++fsmRun->p != fsmRun->pe ) + goto _loop_head; +out: + if ( fsmRun->eof ) { + fsmRun->returnResult = false; + fsmRun->skipToklen = false; + _acts = fsmRun->tables->actions + fsmRun->tables->eofActions[fsmRun->cs]; + _nacts = (unsigned int) *_acts++; + + if ( fsmRun->tables->eofTargs[fsmRun->cs] >= 0 ) + fsmRun->cs = fsmRun->tables->eofTargs[fsmRun->cs]; + + while ( _nacts-- > 0 ) + execAction( fsmRun, fsmRun->tables->actionSwitch[*_acts++] ); + if ( fsmRun->returnResult ) { + if ( fsmRun->skipToklen ) + goto skip_toklen; + goto final; + } + } + +final: + + if ( fsmRun->p != 0 ) + fsmRun->toklen += fsmRun->p - fsmRun->start; +skip_toklen: + {} +} |