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/*
* Copyright 2001-2018 Adrian Thurston <thurston@colm.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _C_GOTO_H
#define _C_GOTO_H
#include <iostream>
#include "codegen.h"
/* Forwards. */
struct CodeGenData;
struct NameInst;
struct RedTransAp;
struct RedStateAp;
struct GenStateCond;
struct IpLabel
{
IpLabel()
:
type(None),
stid(0),
isReferenced(false)
{}
enum Type
{
None = 1,
TestEof,
Ctr,
St,
Out,
Pop
};
std::string reference()
{
isReferenced = true;
return define();
}
std::string define()
{
std::stringstream ss;
switch ( type ) {
case None: break;
case TestEof:
ss << "_test_eof" << stid;
break;
case Ctr:
ss << "_ctr" << stid;
break;
case St:
ss << "_st" << stid;
break;
case Out:
ss << "_out" << stid;
break;
case Pop:
ss << "_pop" << stid;
break;
}
return ss.str();
}
Type type;
int stid;
bool isReferenced;
};
/*
* Goto driven fsm.
*/
class Goto
: public CodeGen
{
public:
enum Type {
Loop = 1,
Exp,
Ip
};
Goto( const CodeGenArgs &args, Type type )
:
CodeGen( args ),
type(type),
acts( "_acts" ),
nacts( "_nacts" ),
ck( "_ck" ),
nbreak( "_nbreak" ),
ps( "_ps" ),
_out("_out"),
_pop("_pop"),
_again("_again"),
_resume("_resume"),
_test_eof("_test_eof"),
actions( "actions", *this ),
toStateActions( "to_state_actions", *this ),
fromStateActions( "from_state_actions", *this ),
eofActions( "eof_actions", *this ),
ctrLabel(0)
{}
void tableDataPass();
virtual void genAnalysis();
virtual void writeData();
virtual void writeExec();
std::ostream &TRANSITION( RedCondPair *pair );
void FROM_STATE_ACTION_EMIT( RedStateAp *state );
std::ostream &STATE_CASES();
std::ostream &TRANSITIONS();
Type type;
Variable acts;
Variable nacts;
Variable ck;
Variable nbreak;
Variable ps;
GotoLabel _out;
GotoLabel _pop;
GotoLabel _again;
GotoLabel _resume;
GotoLabel _test_eof;
TableArray actions;
TableArray toStateActions;
TableArray fromStateActions;
TableArray eofActions;
IpLabel *ctrLabel;
void taActions();
void taToStateActions();
void taFromStateActions();
void taEofActions();
void taNfaTargs();
void taNfaOffsets();
void taNfaPushActions();
void taNfaPopTrans();
void EOF_CHECK( ostream &ret );
void GOTO( ostream &ret, int gotoDest, bool inFinish );
void CALL( ostream &ret, int callDest, int targState, bool inFinish );
void NCALL( ostream &ret, int callDest, int targState, bool inFinish );
void NEXT( ostream &ret, int nextDest, bool inFinish );
void GOTO_EXPR( ostream &ret, GenInlineItem *ilItem, bool inFinish );
void NEXT_EXPR( ostream &ret, GenInlineItem *ilItem, bool inFinish );
void CALL_EXPR( ostream &ret, GenInlineItem *ilItem, int targState, bool inFinish );
void NCALL_EXPR( ostream &ret, GenInlineItem *ilItem, int targState, bool inFinish );
void CURS( ostream &ret, bool inFinish );
void TARGS( ostream &ret, bool inFinish, int targState );
void RET( ostream &ret, bool inFinish );
void NRET( ostream &ret, bool inFinish );
void BREAK( ostream &ret, int targState, bool csForced );
void NBREAK( ostream &ret, int targState, bool csForced );
virtual unsigned int TO_STATE_ACTION( RedStateAp *state );
virtual unsigned int FROM_STATE_ACTION( RedStateAp *state );
virtual unsigned int EOF_ACTION( RedStateAp *state );
virtual std::ostream &EXEC_FUNCS() = 0;
virtual std::ostream &TO_STATE_ACTION_SWITCH() = 0;
virtual std::ostream &FROM_STATE_ACTION_SWITCH() = 0;
virtual std::ostream &EOF_ACTION_SWITCH() = 0;
std::ostream &ACTIONS_ARRAY();
void setTableState( TableArray::State );
virtual std::ostream &COND_GOTO( RedCondPair *trans );
string CKEY( CondKey key );
void COND_B_SEARCH( RedTransAp *trans, CondKey lower, CondKey upper, int low, int high);
virtual std::ostream &TRANS_GOTO( RedTransAp *trans );
void SINGLE_SWITCH( RedStateAp *state );
void RANGE_B_SEARCH( RedStateAp *state, Key lower, Key upper, int low, int high );
/* Called from STATE_GOTOS just before writing the gotos */
virtual void GOTO_HEADER( RedStateAp *state );
virtual void STATE_GOTO_ERROR();
virtual void NFA_PUSH_ACTION( RedNfaTarg *targ ) = 0;
virtual void NFA_POP_TEST( RedNfaTarg *targ ) {}
virtual void NFA_FROM_STATE_ACTION_EXEC() = 0;
void NFA_POP() {}
virtual void FROM_STATE_ACTIONS() = 0;
virtual void TO_STATE_ACTIONS() = 0;
virtual void REG_ACTIONS() = 0;
virtual void EOF_ACTIONS() = 0;
IpLabel *allocateLabels( IpLabel *labels, IpLabel::Type type, int n );
};
#endif
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