2 see copyright notice in squirrel.h
4 #include "sqpcheader.h"
9 #include "sqfuncproto.h"
10 #include "sqcompiler.h"
11 #include "sqfuncstate.h"
15 #define DEREF_NO_DEREF -1
16 #define DEREF_FIELD -2
22 _deref = DEREF_NO_DEREF;
24 _class_or_delete = false;
27 bool _class_or_delete;
33 typedef sqvector<ExpState> ExpStateVec;
35 #define _exst (_expstates.top())
37 #define BEGIN_BREAKBLE_BLOCK() SQInteger __nbreaks__=_fs->_unresolvedbreaks.size(); \
38 SQInteger __ncontinues__=_fs->_unresolvedcontinues.size(); \
39 _fs->_breaktargets.push_back(0);_fs->_continuetargets.push_back(0);
41 #define END_BREAKBLE_BLOCK(continue_target) {__nbreaks__=_fs->_unresolvedbreaks.size()-__nbreaks__; \
42 __ncontinues__=_fs->_unresolvedcontinues.size()-__ncontinues__; \
43 if(__ncontinues__>0)ResolveContinues(_fs,__ncontinues__,continue_target); \
44 if(__nbreaks__>0)ResolveBreaks(_fs,__nbreaks__); \
45 _fs->_breaktargets.pop_back();_fs->_continuetargets.pop_back();}
50 SQCompiler(SQVM *v, SQLEXREADFUNC rg, SQUserPointer up, const SQChar* sourcename, bool raiseerror, bool lineinfo)
53 _lex.Init(_ss(v), rg, up,ThrowError,this);
54 _sourcename = SQString::Create(_ss(v), sourcename);
55 _lineinfo = lineinfo;_raiseerror = raiseerror;
58 static void ThrowError(void *ud, const SQChar *s) {
59 SQCompiler *c = (SQCompiler *)ud;
62 void Error(const SQChar *s, ...)
64 static SQChar temp[256];
67 scvsprintf(temp, s, vl);
72 void Lex(){ _token = _lex.Lex();}
73 void PushExpState(){ _expstates.push_back(ExpState()); }
74 bool IsDerefToken(SQInteger tok)
77 case _SC('='): case _SC('('): case TK_NEWSLOT:
78 case TK_MODEQ: case TK_MULEQ: case TK_DIVEQ: case TK_MINUSEQ: case TK_PLUSEQ: case TK_PLUSPLUS: case TK_MINUSMINUS: return true;
82 ExpState PopExpState()
84 ExpState ret = _expstates.top();
85 _expstates.pop_back();
88 SQObject Expect(SQInteger tok)
92 if(_token == TK_CONSTRUCTOR && tok == TK_IDENTIFIER) {
93 //ret = SQString::Create(_ss(_vm),_SC("constructor"));
97 const SQChar *etypename;
102 etypename = _SC("IDENTIFIER");
104 case TK_STRING_LITERAL:
105 etypename = _SC("STRING_LITERAL");
108 etypename = _SC("INTEGER");
111 etypename = _SC("FLOAT");
114 etypename = _lex.Tok2Str(tok);
116 Error(_SC("expected '%s'"), etypename);
118 Error(_SC("expected '%c'"), tok);
125 ret = _fs->CreateString(_lex._svalue);
127 case TK_STRING_LITERAL:
128 ret = _fs->CreateString(_lex._svalue,_lex._longstr.size()-1);
131 ret = SQObjectPtr(_lex._nvalue);
134 ret = SQObjectPtr(_lex._fvalue);
140 bool IsEndOfStatement() { return ((_lex._prevtoken == _SC('\n')) || (_token == SQUIRREL_EOB) || (_token == _SC('}')) || (_token == _SC(';'))); }
141 void OptionalSemicolon()
143 if(_token == _SC(';')) { Lex(); return; }
144 if(!IsEndOfStatement()) {
145 Error(_SC("end of statement expected (; or lf)"));
148 void MoveIfCurrentTargetIsLocal() {
149 SQInteger trg = _fs->TopTarget();
150 if(_fs->IsLocal(trg)) {
151 trg = _fs->PopTarget(); //no pops the target and move it
152 _fs->AddInstruction(_OP_MOVE, _fs->PushTarget(), trg);
155 bool Compile(SQObjectPtr &o)
160 SQFuncState funcstate(_ss(_vm), NULL,ThrowError,this);
161 funcstate._name = SQString::Create(_ss(_vm), _SC("main"));
163 _fs->AddParameter(_fs->CreateString(_SC("this")));
164 _fs->_sourcename = _sourcename;
165 SQInteger stacksize = _fs->GetStackSize();
166 if(setjmp(_errorjmp) == 0) {
170 if(_lex._prevtoken != _SC('}')) OptionalSemicolon();
172 CleanStack(stacksize);
173 _fs->AddLineInfos(_lex._currentline, _lineinfo, true);
174 _fs->AddInstruction(_OP_RETURN, 0xFF);
175 _fs->SetStackSize(0);
176 o =_fs->BuildProto();
178 _fs->Dump(_funcproto(o));
182 if(_raiseerror && _ss(_vm)->_compilererrorhandler) {
183 _ss(_vm)->_compilererrorhandler(_vm, compilererror, type(_sourcename) == OT_STRING?_stringval(_sourcename):_SC("unknown"),
184 _lex._currentline, _lex._currentcolumn);
186 _vm->_lasterror = SQString::Create(_ss(_vm), compilererror, -1);
193 while(_token != _SC('}') && _token != TK_DEFAULT && _token != TK_CASE) {
195 if(_lex._prevtoken != _SC('}') && _lex._prevtoken != _SC(';')) OptionalSemicolon();
200 _fs->AddLineInfos(_lex._currentline, _lineinfo);
202 case _SC(';'): Lex(); break;
203 case TK_IF: IfStatement(); break;
204 case TK_WHILE: WhileStatement(); break;
205 case TK_DO: DoWhileStatement(); break;
206 case TK_FOR: ForStatement(); break;
207 case TK_FOREACH: ForEachStatement(); break;
208 case TK_SWITCH: SwitchStatement(); break;
209 case TK_LOCAL: LocalDeclStatement(); break;
213 if(_token == TK_RETURN) {
219 _fs->_bgenerator = true;
222 if(!IsEndOfStatement()) {
223 SQInteger retexp = _fs->GetCurrentPos()+1;
225 if(op == _OP_RETURN && _fs->_traps > 0)
226 _fs->AddInstruction(_OP_POPTRAP, _fs->_traps, 0);
227 _fs->_returnexp = retexp;
228 _fs->AddInstruction(op, 1, _fs->PopTarget());
231 if(op == _OP_RETURN && _fs->_traps > 0)
232 _fs->AddInstruction(_OP_POPTRAP, _fs->_traps ,0);
233 _fs->_returnexp = -1;
234 _fs->AddInstruction(op, 0xFF);
238 if(_fs->_breaktargets.size() <= 0)Error(_SC("'break' has to be in a loop block"));
239 if(_fs->_breaktargets.top() > 0){
240 _fs->AddInstruction(_OP_POPTRAP, _fs->_breaktargets.top(), 0);
242 _fs->AddInstruction(_OP_JMP, 0, -1234);
243 _fs->_unresolvedbreaks.push_back(_fs->GetCurrentPos());
247 if(_fs->_continuetargets.size() <= 0)Error(_SC("'continue' has to be in a loop block"));
248 if(_fs->_continuetargets.top() > 0) {
249 _fs->AddInstruction(_OP_POPTRAP, _fs->_continuetargets.top(), 0);
251 _fs->AddInstruction(_OP_JMP, 0, -1234);
252 _fs->_unresolvedcontinues.push_back(_fs->GetCurrentPos());
262 SQInteger stacksize = _fs->GetStackSize();
266 _fs->SetStackSize(stacksize);
275 _fs->AddInstruction(_OP_THROW, _fs->PopTarget());
284 void EmitDerefOp(SQOpcode op)
286 SQInteger val = _fs->PopTarget();
287 SQInteger key = _fs->PopTarget();
288 SQInteger src = _fs->PopTarget();
289 _fs->AddInstruction(op,_fs->PushTarget(),src,key,val);
291 void Emit2ArgsOP(SQOpcode op, SQInteger p3 = 0)
293 SQInteger p2 = _fs->PopTarget(); //src in OP_GET
294 SQInteger p1 = _fs->PopTarget(); //key in OP_GET
295 _fs->AddInstruction(op,_fs->PushTarget(), p1, p2, p3);
297 void EmitCompoundArith(SQInteger tok,bool deref)
301 case TK_MINUSEQ: oper = '-'; break;
302 case TK_PLUSEQ: oper = '+'; break;
303 case TK_MULEQ: oper = '*'; break;
304 case TK_DIVEQ: oper = '/'; break;
305 case TK_MODEQ: oper = '%'; break;
306 default: oper = 0; //shut up compiler
310 SQInteger val = _fs->PopTarget();
311 SQInteger key = _fs->PopTarget();
312 SQInteger src = _fs->PopTarget();
313 //mixes dest obj and source val in the arg1(hack?)
314 _fs->AddInstruction(_OP_COMPARITH,_fs->PushTarget(),(src<<16)|val,key,oper);
317 Emit2ArgsOP(_OP_COMPARITHL, oper);
322 for(Expression();_token == ',';_fs->PopTarget(), Lex(), CommaExpr());
324 ExpState Expression(bool funcarg = false)
327 _exst._class_or_delete = false;
328 _exst._funcarg = funcarg;
339 SQInteger op = _token;
340 SQInteger ds = _exst._deref;
341 bool freevar = _exst._freevar;
342 if(ds == DEREF_NO_DEREF) Error(_SC("can't assign expression"));
347 if(freevar) Error(_SC("free variables cannot be modified"));
348 if(ds == DEREF_FIELD)
349 EmitDerefOp(_OP_NEWSLOT);
350 else //if _derefstate != DEREF_NO_DEREF && DEREF_FIELD so is the index of a local
351 Error(_SC("can't 'create' a local slot"));
353 case _SC('='): //ASSIGN
354 if(freevar) Error(_SC("free variables cannot be modified"));
355 if(ds == DEREF_FIELD)
356 EmitDerefOp(_OP_SET);
357 else {//if _derefstate != DEREF_NO_DEREF && DEREF_FIELD so is the index of a local
358 SQInteger p2 = _fs->PopTarget(); //src in OP_GET
359 SQInteger p1 = _fs->TopTarget(); //key in OP_GET
360 _fs->AddInstruction(_OP_MOVE, p1, p2);
368 EmitCompoundArith(op,ds == DEREF_FIELD);
375 _fs->AddInstruction(_OP_JZ, _fs->PopTarget());
376 SQInteger jzpos = _fs->GetCurrentPos();
377 SQInteger trg = _fs->PushTarget();
379 SQInteger first_exp = _fs->PopTarget();
380 if(trg != first_exp) _fs->AddInstruction(_OP_MOVE, trg, first_exp);
381 SQInteger endfirstexp = _fs->GetCurrentPos();
382 _fs->AddInstruction(_OP_JMP, 0, 0);
384 SQInteger jmppos = _fs->GetCurrentPos();
386 SQInteger second_exp = _fs->PopTarget();
387 if(trg != second_exp) _fs->AddInstruction(_OP_MOVE, trg, second_exp);
388 _fs->SetIntructionParam(jmppos, 1, _fs->GetCurrentPos() - jmppos);
389 _fs->SetIntructionParam(jzpos, 1, endfirstexp - jzpos + 1);
394 return PopExpState();
396 void BIN_EXP(SQOpcode op, void (SQCompiler::*f)(void),SQInteger op3 = 0)
399 SQInteger op1 = _fs->PopTarget();SQInteger op2 = _fs->PopTarget();
400 _fs->AddInstruction(op, _fs->PushTarget(), op1, op2, op3);
405 for(;;) if(_token == TK_OR) {
406 SQInteger first_exp = _fs->PopTarget();
407 SQInteger trg = _fs->PushTarget();
408 _fs->AddInstruction(_OP_OR, trg, 0, first_exp, 0);
409 SQInteger jpos = _fs->GetCurrentPos();
410 if(trg != first_exp) _fs->AddInstruction(_OP_MOVE, trg, first_exp);
411 Lex(); LogicalOrExp();
413 SQInteger second_exp = _fs->PopTarget();
414 if(trg != second_exp) _fs->AddInstruction(_OP_MOVE, trg, second_exp);
416 _fs->SetIntructionParam(jpos, 1, (_fs->GetCurrentPos() - jpos));
423 for(;;) switch(_token) {
425 SQInteger first_exp = _fs->PopTarget();
426 SQInteger trg = _fs->PushTarget();
427 _fs->AddInstruction(_OP_AND, trg, 0, first_exp, 0);
428 SQInteger jpos = _fs->GetCurrentPos();
429 if(trg != first_exp) _fs->AddInstruction(_OP_MOVE, trg, first_exp);
430 Lex(); LogicalAndExp();
432 SQInteger second_exp = _fs->PopTarget();
433 if(trg != second_exp) _fs->AddInstruction(_OP_MOVE, trg, second_exp);
435 _fs->SetIntructionParam(jpos, 1, (_fs->GetCurrentPos() - jpos));
438 case TK_IN: BIN_EXP(_OP_EXISTS, &SQCompiler::BitwiseOrExp); break;
439 case TK_INSTANCEOF: BIN_EXP(_OP_INSTANCEOF, &SQCompiler::BitwiseOrExp); break;
447 for(;;) if(_token == _SC('|'))
448 {BIN_EXP(_OP_BITW, &SQCompiler::BitwiseXorExp,BW_OR);
454 for(;;) if(_token == _SC('^'))
455 {BIN_EXP(_OP_BITW, &SQCompiler::BitwiseAndExp,BW_XOR);
461 for(;;) if(_token == _SC('&'))
462 {BIN_EXP(_OP_BITW, &SQCompiler::CompExp,BW_AND);
468 for(;;) switch(_token) {
469 case TK_EQ: BIN_EXP(_OP_EQ, &SQCompiler::ShiftExp); break;
470 case _SC('>'): BIN_EXP(_OP_CMP, &SQCompiler::ShiftExp,CMP_G); break;
471 case _SC('<'): BIN_EXP(_OP_CMP, &SQCompiler::ShiftExp,CMP_L); break;
472 case TK_GE: BIN_EXP(_OP_CMP, &SQCompiler::ShiftExp,CMP_GE); break;
473 case TK_LE: BIN_EXP(_OP_CMP, &SQCompiler::ShiftExp,CMP_LE); break;
474 case TK_NE: BIN_EXP(_OP_NE, &SQCompiler::ShiftExp); break;
481 for(;;) switch(_token) {
482 case TK_USHIFTR: BIN_EXP(_OP_BITW, &SQCompiler::PlusExp,BW_USHIFTR); break;
483 case TK_SHIFTL: BIN_EXP(_OP_BITW, &SQCompiler::PlusExp,BW_SHIFTL); break;
484 case TK_SHIFTR: BIN_EXP(_OP_BITW, &SQCompiler::PlusExp,BW_SHIFTR); break;
491 for(;;) switch(_token) {
492 case _SC('+'): case _SC('-'):
493 BIN_EXP(_OP_ARITH, &SQCompiler::MultExp,_token); break;
501 for(;;) switch(_token) {
502 case _SC('*'): case _SC('/'): case _SC('%'):
503 BIN_EXP(_OP_ARITH, &SQCompiler::PrefixedExpr,_token); break;
507 //if 'pos' != -1 the previous variable is a local variable
510 SQInteger pos = Factor();
516 if(_token == TK_PARENT) {
519 Error(_SC("parent cannot be set"));
520 SQInteger src = _fs->PopTarget();
521 _fs->AddInstruction(_OP_GETPARENT, _fs->PushTarget(), src);
524 _fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(Expect(TK_IDENTIFIER)));
525 if(NeedGet()) Emit2ArgsOP(_OP_GET);
527 _exst._deref = DEREF_FIELD;
528 _exst._freevar = false;
532 if(_lex._prevtoken == _SC('\n')) Error(_SC("cannot brake deref/or comma needed after [exp]=exp slot declaration"));
533 Lex(); Expression(); Expect(_SC(']'));
535 if(NeedGet()) Emit2ArgsOP(_OP_GET);
536 _exst._deref = DEREF_FIELD;
537 _exst._freevar = false;
541 if(_exst._deref != DEREF_NO_DEREF && !IsEndOfStatement()) {
542 SQInteger tok = _token; Lex();
544 Emit2ArgsOP(_OP_PINC,tok == TK_MINUSMINUS?-1:1);
545 else {//if _derefstate != DEREF_NO_DEREF && DEREF_FIELD so is the index of a local
546 SQInteger src = _fs->PopTarget();
547 _fs->AddInstruction(_OP_PINCL, _fs->PushTarget(), src, 0, tok == TK_MINUSMINUS?-1:1);
555 if(_exst._deref != DEREF_NO_DEREF) {
557 SQInteger key = _fs->PopTarget(); //key
558 SQInteger table = _fs->PopTarget(); //table etc...
559 SQInteger closure = _fs->PushTarget();
560 SQInteger ttarget = _fs->PushTarget();
561 _fs->AddInstruction(_OP_PREPCALL, closure, key, table, ttarget);
564 _fs->AddInstruction(_OP_MOVE, _fs->PushTarget(), 0);
568 _fs->AddInstruction(_OP_MOVE, _fs->PushTarget(), 0);
569 _exst._deref = DEREF_NO_DEREF;
582 case TK_STRING_LITERAL: {
583 //SQObjectPtr id(SQString::Create(_ss(_vm), _lex._svalue,_lex._longstr.size()-1));
584 _fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(_fs->CreateString(_lex._svalue,_lex._longstr.size()-1)));
588 case TK_VARGC: Lex(); _fs->AddInstruction(_OP_VARGC, _fs->PushTarget()); break;
589 case TK_VARGV: { Lex();
593 SQInteger src = _fs->PopTarget();
594 _fs->AddInstruction(_OP_GETVARGV, _fs->PushTarget(), src);
600 _exst._freevar = false;
603 case TK_IDENTIFIER: id = _fs->CreateString(_lex._svalue); break;
604 case TK_THIS: id = _fs->CreateString(_SC("this")); break;
605 case TK_CONSTRUCTOR: id = _fs->CreateString(_SC("constructor")); break;
609 if((pos = _fs->GetLocalVariable(id)) == -1) {
610 //checks if is a free variable
611 if((pos = _fs->GetOuterVariable(id)) != -1) {
612 _exst._deref = _fs->PushTarget();
613 _fs->AddInstruction(_OP_LOADFREEVAR, _exst._deref ,pos);
614 _exst._freevar = true;
617 _fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(id));
618 if(NeedGet()) Emit2ArgsOP(_OP_GET);
619 _exst._deref = DEREF_FIELD;
623 _fs->PushTarget(pos);
629 case TK_PARENT: Lex();_fs->AddInstruction(_OP_GETPARENT, _fs->PushTarget(), 0); break;
630 case TK_DOUBLE_COLON: // "::"
631 _fs->AddInstruction(_OP_LOADROOTTABLE, _fs->PushTarget());
632 _exst._deref = DEREF_FIELD;
633 _token = _SC('.'); //hack
637 _fs->AddInstruction(_OP_LOADNULLS, _fs->PushTarget(),1);
641 if((_lex._nvalue & (~0x7FFFFFFF)) == 0) { //does it fit in 32 bits?
642 _fs->AddInstruction(_OP_LOADINT, _fs->PushTarget(),_lex._nvalue);
645 _fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetNumericConstant(_lex._nvalue));
651 _fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetNumericConstant(_lex._fvalue));
654 case TK_TRUE: case TK_FALSE:
655 _fs->AddInstruction(_OP_LOADBOOL, _fs->PushTarget(),_token == TK_TRUE?1:0);
659 _fs->AddInstruction(_OP_NEWARRAY, _fs->PushTarget());
660 SQInteger apos = _fs->GetCurrentPos(),key = 0;
662 while(_token != _SC(']')) {
664 if(_token == _SC(',')) Lex();
665 SQInteger val = _fs->PopTarget();
666 SQInteger array = _fs->TopTarget();
667 _fs->AddInstruction(_OP_APPENDARRAY, array, val);
670 _fs->SetIntructionParam(apos, 1, key);
675 _fs->AddInstruction(_OP_NEWTABLE, _fs->PushTarget());
676 Lex();ParseTableOrClass(_SC(','));
679 case TK_FUNCTION: FunctionExp(_token);break;
680 case TK_CLASS: Lex(); ClassExp();break;
681 case _SC('-'): UnaryOP(_OP_NEG); break;
682 case _SC('!'): UnaryOP(_OP_NOT); break;
683 case _SC('~'): UnaryOP(_OP_BWNOT); break;
684 case TK_TYPEOF : UnaryOP(_OP_TYPEOF); break;
685 case TK_RESUME : UnaryOP(_OP_RESUME); break;
686 case TK_CLONE : UnaryOP(_OP_CLONE); break;
688 case TK_PLUSPLUS :PrefixIncDec(_token); break;
689 case TK_DELETE : DeleteExpr(); break;
690 case TK_DELEGATE : DelegateExpr(); break;
691 case _SC('('): Lex(); CommaExpr(); Expect(_SC(')'));
693 default: Error(_SC("expression expected"));
697 void UnaryOP(SQOpcode op)
699 Lex(); PrefixedExpr();
700 SQInteger src = _fs->PopTarget();
701 _fs->AddInstruction(op, _fs->PushTarget(), src);
706 case _SC('='): case _SC('('): case TK_NEWSLOT: case TK_PLUSPLUS: case TK_MINUSMINUS:
707 case TK_PLUSEQ: case TK_MINUSEQ: case TK_MULEQ: case TK_DIVEQ: case TK_MODEQ:
710 return (!_exst._class_or_delete) || (_exst._class_or_delete && (_token == _SC('.') || _token == _SC('[')));
713 void FunctionCallArgs()
715 SQInteger nargs = 1;//this
716 while(_token != _SC(')')) {
718 MoveIfCurrentTargetIsLocal();
720 if(_token == _SC(',')){
722 if(_token == ')') Error(_SC("expression expected, found ')'"));
726 for(SQInteger i = 0; i < (nargs - 1); i++) _fs->PopTarget();
727 SQInteger stackbase = _fs->PopTarget();
728 SQInteger closure = _fs->PopTarget();
729 _fs->AddInstruction(_OP_CALL, _fs->PushTarget(), closure, stackbase, nargs);
731 void ParseTableOrClass(SQInteger separator,SQInteger terminator = '}')
733 SQInteger tpos = _fs->GetCurrentPos(),nkeys = 0;
735 while(_token != terminator) {
736 bool hasattrs = false;
737 bool isstatic = false;
738 //check if is an attribute
739 if(separator == ';') {
740 if(_token == TK_ATTR_OPEN) {
741 _fs->AddInstruction(_OP_NEWTABLE, _fs->PushTarget()); Lex();
742 ParseTableOrClass(',',TK_ATTR_CLOSE);
745 if(_token == TK_STATIC) {
752 case TK_CONSTRUCTOR:{
753 SQInteger tk = _token;
755 SQObject id = tk == TK_FUNCTION ? Expect(TK_IDENTIFIER) : _fs->CreateString(_SC("constructor"));
757 _fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(id));
759 _fs->AddInstruction(_OP_CLOSURE, _fs->PushTarget(), _fs->_functions.size() - 1, 0);
763 Lex(); CommaExpr(); Expect(_SC(']'));
764 Expect(_SC('=')); Expression();
767 _fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(Expect(TK_IDENTIFIER)));
768 Expect(_SC('=')); Expression();
771 if(_token == separator) Lex();//optional comma/semicolon
773 SQInteger val = _fs->PopTarget();
774 SQInteger key = _fs->PopTarget();
775 SQInteger attrs = hasattrs ? _fs->PopTarget():-1;
776 assert(hasattrs && attrs == key-1 || !hasattrs);
777 unsigned char flags = (hasattrs?NEW_SLOT_ATTRIBUTES_FLAG:0)|(isstatic?NEW_SLOT_STATIC_FLAG:0);
778 SQInteger table = _fs->TopTarget(); //<<BECAUSE OF THIS NO COMMON EMIT FUNC IS POSSIBLE
779 _fs->AddInstruction(_OP_NEWSLOTA, flags, table, key, val);
782 if(separator == _SC(',')) //hack recognizes a table from the separator
783 _fs->SetIntructionParam(tpos, 1, nkeys);
786 void LocalDeclStatement()
790 Lex(); varname = Expect(TK_IDENTIFIER);
791 if(_token == _SC('=')) {
793 SQInteger src = _fs->PopTarget();
794 SQInteger dest = _fs->PushTarget();
795 if(dest != src) _fs->AddInstruction(_OP_MOVE, dest, src);
798 _fs->AddInstruction(_OP_LOADNULLS, _fs->PushTarget(),1);
801 _fs->PushLocalVariable(varname);
803 } while(_token == _SC(','));
808 bool haselse = false;
809 Lex(); Expect(_SC('(')); CommaExpr(); Expect(_SC(')'));
810 _fs->AddInstruction(_OP_JZ, _fs->PopTarget());
811 SQInteger jnepos = _fs->GetCurrentPos();
812 SQInteger stacksize = _fs->GetStackSize();
816 if(_token != _SC('}') && _token != TK_ELSE) OptionalSemicolon();
818 CleanStack(stacksize);
819 SQInteger endifblock = _fs->GetCurrentPos();
820 if(_token == TK_ELSE){
822 stacksize = _fs->GetStackSize();
823 _fs->AddInstruction(_OP_JMP);
824 jmppos = _fs->GetCurrentPos();
826 Statement(); OptionalSemicolon();
827 CleanStack(stacksize);
828 _fs->SetIntructionParam(jmppos, 1, _fs->GetCurrentPos() - jmppos);
830 _fs->SetIntructionParam(jnepos, 1, endifblock - jnepos + (haselse?1:0));
832 void WhileStatement()
834 SQInteger jzpos, jmppos;
835 SQInteger stacksize = _fs->GetStackSize();
836 jmppos = _fs->GetCurrentPos();
837 Lex(); Expect(_SC('(')); CommaExpr(); Expect(_SC(')'));
839 BEGIN_BREAKBLE_BLOCK();
840 _fs->AddInstruction(_OP_JZ, _fs->PopTarget());
841 jzpos = _fs->GetCurrentPos();
842 stacksize = _fs->GetStackSize();
846 CleanStack(stacksize);
847 _fs->AddInstruction(_OP_JMP, 0, jmppos - _fs->GetCurrentPos() - 1);
848 _fs->SetIntructionParam(jzpos, 1, _fs->GetCurrentPos() - jzpos);
850 END_BREAKBLE_BLOCK(jmppos);
852 void DoWhileStatement()
855 SQInteger jzpos = _fs->GetCurrentPos();
856 SQInteger stacksize = _fs->GetStackSize();
857 BEGIN_BREAKBLE_BLOCK()
859 CleanStack(stacksize);
861 SQInteger continuetrg = _fs->GetCurrentPos();
862 Expect(_SC('(')); CommaExpr(); Expect(_SC(')'));
863 _fs->AddInstruction(_OP_JNZ, _fs->PopTarget(), jzpos - _fs->GetCurrentPos() - 1);
864 END_BREAKBLE_BLOCK(continuetrg);
869 SQInteger stacksize = _fs->GetStackSize();
871 if(_token == TK_LOCAL) LocalDeclStatement();
872 else if(_token != _SC(';')){
878 SQInteger jmppos = _fs->GetCurrentPos();
879 SQInteger jzpos = -1;
880 if(_token != _SC(';')) { CommaExpr(); _fs->AddInstruction(_OP_JZ, _fs->PopTarget()); jzpos = _fs->GetCurrentPos(); }
883 SQInteger expstart = _fs->GetCurrentPos() + 1;
884 if(_token != _SC(')')) {
890 SQInteger expend = _fs->GetCurrentPos();
891 SQInteger expsize = (expend - expstart) + 1;
892 SQInstructionVec exp;
894 for(SQInteger i = 0; i < expsize; i++)
895 exp.push_back(_fs->GetInstruction(expstart + i));
896 _fs->PopInstructions(expsize);
898 BEGIN_BREAKBLE_BLOCK()
900 SQInteger continuetrg = _fs->GetCurrentPos();
902 for(SQInteger i = 0; i < expsize; i++)
903 _fs->AddInstruction(exp[i]);
905 _fs->AddInstruction(_OP_JMP, 0, jmppos - _fs->GetCurrentPos() - 1, 0);
906 if(jzpos> 0) _fs->SetIntructionParam(jzpos, 1, _fs->GetCurrentPos() - jzpos);
907 CleanStack(stacksize);
909 END_BREAKBLE_BLOCK(continuetrg);
911 void ForEachStatement()
913 SQObject idxname, valname;
914 Lex(); Expect(_SC('(')); valname = Expect(TK_IDENTIFIER);
915 if(_token == _SC(',')) {
917 Lex(); valname = Expect(TK_IDENTIFIER);
920 idxname = _fs->CreateString(_SC("@INDEX@"));
924 //save the stack size
925 SQInteger stacksize = _fs->GetStackSize();
926 //put the table in the stack(evaluate the table expression)
927 Expression(); Expect(_SC(')'));
928 SQInteger container = _fs->TopTarget();
929 //push the index local var
930 SQInteger indexpos = _fs->PushLocalVariable(idxname);
931 _fs->AddInstruction(_OP_LOADNULLS, indexpos,1);
932 //push the value local var
933 SQInteger valuepos = _fs->PushLocalVariable(valname);
934 _fs->AddInstruction(_OP_LOADNULLS, valuepos,1);
935 //push reference index
936 SQInteger itrpos = _fs->PushLocalVariable(_fs->CreateString(_SC("@ITERATOR@"))); //use invalid id to make it inaccessible
937 _fs->AddInstruction(_OP_LOADNULLS, itrpos,1);
938 SQInteger jmppos = _fs->GetCurrentPos();
939 _fs->AddInstruction(_OP_FOREACH, container, 0, indexpos);
940 SQInteger foreachpos = _fs->GetCurrentPos();
941 //generate the statement code
942 BEGIN_BREAKBLE_BLOCK()
944 _fs->AddInstruction(_OP_JMP, 0, jmppos - _fs->GetCurrentPos() - 1);
945 _fs->SetIntructionParam(foreachpos, 1, _fs->GetCurrentPos() - foreachpos);
946 //restore the local variable stack(remove index,val and ref idx)
947 CleanStack(stacksize);
948 END_BREAKBLE_BLOCK(foreachpos - 1);
950 void SwitchStatement()
952 Lex(); Expect(_SC('(')); CommaExpr(); Expect(_SC(')'));
954 SQInteger expr = _fs->TopTarget();
956 SQInteger tonextcondjmp = -1;
957 SQInteger skipcondjmp = -1;
958 SQInteger __nbreaks__ = _fs->_unresolvedbreaks.size();
959 _fs->_breaktargets.push_back(0);
960 while(_token == TK_CASE) {
961 //_fs->AddLineInfos(_lex._currentline, _lineinfo); think about this one
963 _fs->AddInstruction(_OP_JMP, 0, 0);
964 skipcondjmp = _fs->GetCurrentPos();
965 _fs->SetIntructionParam(tonextcondjmp, 1, _fs->GetCurrentPos() - tonextcondjmp);
968 Lex(); Expression(); Expect(_SC(':'));
969 SQInteger trg = _fs->PopTarget();
970 _fs->AddInstruction(_OP_EQ, trg, trg, expr);
971 _fs->AddInstruction(_OP_JZ, trg, 0);
973 if(skipcondjmp != -1) {
974 _fs->SetIntructionParam(skipcondjmp, 1, (_fs->GetCurrentPos() - skipcondjmp));
976 tonextcondjmp = _fs->GetCurrentPos();
977 SQInteger stacksize = _fs->GetStackSize();
979 _fs->SetStackSize(stacksize);
982 if(tonextcondjmp != -1)
983 _fs->SetIntructionParam(tonextcondjmp, 1, _fs->GetCurrentPos() - tonextcondjmp);
984 if(_token == TK_DEFAULT) {
985 // _fs->AddLineInfos(_lex._currentline, _lineinfo);
986 Lex(); Expect(_SC(':'));
987 SQInteger stacksize = _fs->GetStackSize();
989 _fs->SetStackSize(stacksize);
993 __nbreaks__ = _fs->_unresolvedbreaks.size() - __nbreaks__;
994 if(__nbreaks__ > 0)ResolveBreaks(_fs, __nbreaks__);
995 _fs->_breaktargets.pop_back();
998 void FunctionStatement()
1001 Lex(); id = Expect(TK_IDENTIFIER);
1003 _fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(id));
1004 if(_token == TK_DOUBLE_COLON) Emit2ArgsOP(_OP_GET);
1006 while(_token == TK_DOUBLE_COLON) {
1008 id = Expect(TK_IDENTIFIER);
1009 _fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(id));
1010 if(_token == TK_DOUBLE_COLON) Emit2ArgsOP(_OP_GET);
1014 _fs->AddInstruction(_OP_CLOSURE, _fs->PushTarget(), _fs->_functions.size() - 1, 0);
1015 EmitDerefOp(_OP_NEWSLOT);
1018 void ClassStatement()
1021 Lex(); PushExpState();
1022 _exst._class_or_delete = true;
1023 _exst._funcarg = false;
1026 if(es._deref == DEREF_NO_DEREF) Error(_SC("invalid class name"));
1027 if(es._deref == DEREF_FIELD) {
1029 EmitDerefOp(_OP_NEWSLOT);
1032 else Error(_SC("cannot create a class in a local with the syntax(class <local>)"));
1034 void TryCatchStatement()
1038 _fs->AddInstruction(_OP_PUSHTRAP,0,0);
1040 if(_fs->_breaktargets.size()) _fs->_breaktargets.top()++;
1041 if(_fs->_continuetargets.size()) _fs->_continuetargets.top()++;
1042 SQInteger trappos = _fs->GetCurrentPos();
1045 _fs->AddInstruction(_OP_POPTRAP, 1, 0);
1046 if(_fs->_breaktargets.size()) _fs->_breaktargets.top()--;
1047 if(_fs->_continuetargets.size()) _fs->_continuetargets.top()--;
1048 _fs->AddInstruction(_OP_JMP, 0, 0);
1049 SQInteger jmppos = _fs->GetCurrentPos();
1050 _fs->SetIntructionParam(trappos, 1, (_fs->GetCurrentPos() - trappos));
1051 Expect(TK_CATCH); Expect(_SC('(')); exid = Expect(TK_IDENTIFIER); Expect(_SC(')'));
1052 SQInteger stacksize = _fs->GetStackSize();
1053 SQInteger ex_target = _fs->PushLocalVariable(exid);
1054 _fs->SetIntructionParam(trappos, 0, ex_target);
1056 _fs->SetIntructionParams(jmppos, 0, (_fs->GetCurrentPos() - jmppos), 0);
1057 CleanStack(stacksize);
1059 void FunctionExp(SQInteger ftype)
1061 Lex(); Expect(_SC('('));
1062 CreateFunction(_null_);
1063 _fs->AddInstruction(_OP_CLOSURE, _fs->PushTarget(), _fs->_functions.size() - 1, ftype == TK_FUNCTION?0:1);
1067 SQInteger base = -1;
1068 SQInteger attrs = -1;
1069 if(_token == TK_EXTENDS) {
1070 Lex(); Expression();
1071 base = _fs->TopTarget();
1073 if(_token == TK_ATTR_OPEN) {
1075 _fs->AddInstruction(_OP_NEWTABLE, _fs->PushTarget());
1076 ParseTableOrClass(_SC(','),TK_ATTR_CLOSE);
1077 attrs = _fs->TopTarget();
1080 if(attrs != -1) _fs->PopTarget();
1081 if(base != -1) _fs->PopTarget();
1082 _fs->AddInstruction(_OP_CLASS, _fs->PushTarget(), base, attrs);
1083 ParseTableOrClass(_SC(';'));
1090 SQInteger table = _fs->PopTarget(), delegate = _fs->PopTarget();
1091 _fs->AddInstruction(_OP_DELEGATE, _fs->PushTarget(), table, delegate);
1096 Lex(); PushExpState();
1097 _exst._class_or_delete = true;
1098 _exst._funcarg = false;
1101 if(es._deref == DEREF_NO_DEREF) Error(_SC("can't delete an expression"));
1102 if(es._deref == DEREF_FIELD) Emit2ArgsOP(_OP_DELETE);
1103 else Error(_SC("cannot delete a local"));
1105 void PrefixIncDec(SQInteger token)
1108 Lex(); PushExpState();
1109 _exst._class_or_delete = true;
1110 _exst._funcarg = false;
1113 if(es._deref == DEREF_FIELD) Emit2ArgsOP(_OP_INC,token == TK_MINUSMINUS?-1:1);
1115 SQInteger src = _fs->PopTarget();
1116 _fs->AddInstruction(_OP_INCL, _fs->PushTarget(), src, 0, token == TK_MINUSMINUS?-1:1);
1119 void CreateFunction(SQObject &name)
1122 SQFuncState *funcstate = _fs->PushChildState(_ss(_vm));
1123 funcstate->_name = name;
1125 funcstate->AddParameter(_fs->CreateString(_SC("this")));
1126 funcstate->_sourcename = _sourcename;
1127 while(_token!=_SC(')')) {
1128 if(_token == TK_VARPARAMS) {
1129 funcstate->_varparams = true;
1131 if(_token != _SC(')')) Error(_SC("expected ')'"));
1135 paramname = Expect(TK_IDENTIFIER);
1136 funcstate->AddParameter(paramname);
1137 if(_token == _SC(',')) Lex();
1138 else if(_token != _SC(')')) Error(_SC("expected ')' or ','"));
1143 if(_token == _SC(':')) {
1144 Lex(); Expect(_SC('('));
1145 while(_token != _SC(')')) {
1146 paramname = Expect(TK_IDENTIFIER);
1147 //outers are treated as implicit local variables
1148 funcstate->AddOuterValue(paramname);
1149 if(_token == _SC(',')) Lex();
1150 else if(_token != _SC(')')) Error(_SC("expected ')' or ','"));
1155 SQFuncState *currchunk = _fs;
1158 funcstate->AddLineInfos(_lex._prevtoken == _SC('\n')?_lex._lasttokenline:_lex._currentline, _lineinfo, true);
1159 funcstate->AddInstruction(_OP_RETURN, -1);
1160 funcstate->SetStackSize(0);
1161 //_fs->->_stacksize = _fs->_stacksize;
1162 SQFunctionProto *func = funcstate->BuildProto();
1164 funcstate->Dump(func);
1167 _fs->_functions.push_back(func);
1168 _fs->PopChildState();
1170 void CleanStack(SQInteger stacksize)
1172 if(_fs->GetStackSize() != stacksize)
1173 _fs->SetStackSize(stacksize);
1175 void ResolveBreaks(SQFuncState *funcstate, SQInteger ntoresolve)
1177 while(ntoresolve > 0) {
1178 SQInteger pos = funcstate->_unresolvedbreaks.back();
1179 funcstate->_unresolvedbreaks.pop_back();
1180 //set the jmp instruction
1181 funcstate->SetIntructionParams(pos, 0, funcstate->GetCurrentPos() - pos, 0);
1185 void ResolveContinues(SQFuncState *funcstate, SQInteger ntoresolve, SQInteger targetpos)
1187 while(ntoresolve > 0) {
1188 SQInteger pos = funcstate->_unresolvedcontinues.back();
1189 funcstate->_unresolvedcontinues.pop_back();
1190 //set the jmp instruction
1191 funcstate->SetIntructionParams(pos, 0, targetpos - pos, 0);
1198 SQObjectPtr _sourcename;
1202 SQInteger _debugline;
1204 ExpStateVec _expstates;
1205 SQChar *compilererror;
1210 bool Compile(SQVM *vm,SQLEXREADFUNC rg, SQUserPointer up, const SQChar *sourcename, SQObjectPtr &out, bool raiseerror, bool lineinfo)
1212 SQCompiler p(vm, rg, up, sourcename, raiseerror, lineinfo);
1213 return p.Compile(out);