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bluecore/squirrel/squirrel/sqcompiler.cpp

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/*
see copyright notice in squirrel.h
*/
#include "sqpcheader.h"
#include <stdarg.h>
#include <setjmp.h>
#include "sqopcodes.h"
#include "sqstring.h"
#include "sqfuncproto.h"
#include "sqcompiler.h"
#include "sqfuncstate.h"
#include "sqlexer.h"
#include "sqvm.h"
#define DEREF_NO_DEREF -1
#define DEREF_FIELD -2
struct ExpState
{
ExpState()
{
_deref = DEREF_NO_DEREF;
_freevar = false;
_class_or_delete = false;
_funcarg = false;
}
bool _class_or_delete;
bool _funcarg;
bool _freevar;
SQInteger _deref;
};
typedef sqvector<ExpState> ExpStateVec;
#define _exst (_expstates.top())
#define BEGIN_BREAKBLE_BLOCK() SQInteger __nbreaks__=_fs->_unresolvedbreaks.size(); \
SQInteger __ncontinues__=_fs->_unresolvedcontinues.size(); \
_fs->_breaktargets.push_back(0);_fs->_continuetargets.push_back(0);
#define END_BREAKBLE_BLOCK(continue_target) {__nbreaks__=_fs->_unresolvedbreaks.size()-__nbreaks__; \
__ncontinues__=_fs->_unresolvedcontinues.size()-__ncontinues__; \
if(__ncontinues__>0)ResolveContinues(_fs,__ncontinues__,continue_target); \
if(__nbreaks__>0)ResolveBreaks(_fs,__nbreaks__); \
_fs->_breaktargets.pop_back();_fs->_continuetargets.pop_back();}
class SQCompiler
{
public:
SQCompiler(SQVM *v, SQLEXREADFUNC rg, SQUserPointer up, const SQChar* sourcename, bool raiseerror, bool lineinfo)
{
_vm=v;
_lex.Init(_ss(v), rg, up,ThrowError,this);
_sourcename = SQString::Create(_ss(v), sourcename);
_lineinfo = lineinfo;_raiseerror = raiseerror;
compilererror = NULL;
}
static void ThrowError(void *ud, const SQChar *s) {
SQCompiler *c = (SQCompiler *)ud;
c->Error(s);
}
void Error(const SQChar *s, ...)
{
static SQChar temp[256];
va_list vl;
va_start(vl, s);
scvsprintf(temp, s, vl);
va_end(vl);
compilererror = temp;
longjmp(_errorjmp,1);
}
void Lex(){ _token = _lex.Lex();}
void PushExpState(){ _expstates.push_back(ExpState()); }
bool IsDerefToken(SQInteger tok)
{
switch(tok){
case _SC('='): case _SC('('): case TK_NEWSLOT:
case TK_MODEQ: case TK_MULEQ: case TK_DIVEQ: case TK_MINUSEQ: case TK_PLUSEQ: case TK_PLUSPLUS: case TK_MINUSMINUS: return true;
}
return false;
}
ExpState PopExpState()
{
ExpState ret = _expstates.top();
_expstates.pop_back();
return ret;
}
SQObject Expect(SQInteger tok)
{
if(_token != tok) {
if(_token == TK_CONSTRUCTOR && tok == TK_IDENTIFIER) {
//ret = SQString::Create(_ss(_vm),_SC("constructor"));
//do nothing
}
else {
const SQChar *etypename;
if(tok > 255) {
switch(tok)
{
case TK_IDENTIFIER:
etypename = _SC("IDENTIFIER");
break;
case TK_STRING_LITERAL:
etypename = _SC("STRING_LITERAL");
break;
case TK_INTEGER:
etypename = _SC("INTEGER");
break;
case TK_FLOAT:
etypename = _SC("FLOAT");
break;
default:
etypename = _lex.Tok2Str(tok);
}
Error(_SC("expected '%s'"), etypename);
}
Error(_SC("expected '%c'"), tok);
}
}
SQObjectPtr ret;
switch(tok)
{
case TK_IDENTIFIER:
ret = _fs->CreateString(_lex._svalue);
break;
case TK_STRING_LITERAL:
ret = _fs->CreateString(_lex._svalue,_lex._longstr.size()-1);
break;
case TK_INTEGER:
ret = SQObjectPtr(_lex._nvalue);
break;
case TK_FLOAT:
ret = SQObjectPtr(_lex._fvalue);
break;
}
Lex();
return ret;
}
bool IsEndOfStatement() { return ((_lex._prevtoken == _SC('\n')) || (_token == SQUIRREL_EOB) || (_token == _SC('}')) || (_token == _SC(';'))); }
void OptionalSemicolon()
{
if(_token == _SC(';')) { Lex(); return; }
if(!IsEndOfStatement()) {
Error(_SC("end of statement expected (; or lf)"));
}
}
void MoveIfCurrentTargetIsLocal() {
SQInteger trg = _fs->TopTarget();
if(_fs->IsLocal(trg)) {
trg = _fs->PopTarget(); //no pops the target and move it
_fs->AddInstruction(_OP_MOVE, _fs->PushTarget(), trg);
}
}
bool Compile(SQObjectPtr &o)
{
_debugline = 1;
_debugop = 0;
SQFuncState funcstate(_ss(_vm), NULL,ThrowError,this);
funcstate._name = SQString::Create(_ss(_vm), _SC("main"));
_fs = &funcstate;
_fs->AddParameter(_fs->CreateString(_SC("this")));
_fs->_sourcename = _sourcename;
SQInteger stacksize = _fs->GetStackSize();
if(setjmp(_errorjmp) == 0) {
Lex();
while(_token > 0){
Statement();
if(_lex._prevtoken != _SC('}')) OptionalSemicolon();
}
CleanStack(stacksize);
_fs->AddLineInfos(_lex._currentline, _lineinfo, true);
_fs->AddInstruction(_OP_RETURN, 0xFF);
_fs->SetStackSize(0);
o =_fs->BuildProto();
#ifdef _DEBUG_DUMP
_fs->Dump(_funcproto(o));
#endif
}
else {
if(_raiseerror && _ss(_vm)->_compilererrorhandler) {
_ss(_vm)->_compilererrorhandler(_vm, compilererror, type(_sourcename) == OT_STRING?_stringval(_sourcename):_SC("unknown"),
_lex._currentline, _lex._currentcolumn);
}
_vm->_lasterror = SQString::Create(_ss(_vm), compilererror, -1);
return false;
}
return true;
}
void Statements()
{
while(_token != _SC('}') && _token != TK_DEFAULT && _token != TK_CASE) {
Statement();
if(_lex._prevtoken != _SC('}') && _lex._prevtoken != _SC(';')) OptionalSemicolon();
}
}
void Statement()
{
_fs->AddLineInfos(_lex._currentline, _lineinfo);
switch(_token){
case _SC(';'): Lex(); break;
case TK_IF: IfStatement(); break;
case TK_WHILE: WhileStatement(); break;
case TK_DO: DoWhileStatement(); break;
case TK_FOR: ForStatement(); break;
case TK_FOREACH: ForEachStatement(); break;
case TK_SWITCH: SwitchStatement(); break;
case TK_LOCAL: LocalDeclStatement(); break;
case TK_RETURN:
case TK_YIELD: {
SQOpcode op;
if(_token == TK_RETURN) {
op = _OP_RETURN;
}
else {
op = _OP_YIELD;
_fs->_bgenerator = true;
}
Lex();
if(!IsEndOfStatement()) {
SQInteger retexp = _fs->GetCurrentPos()+1;
CommaExpr();
if(op == _OP_RETURN && _fs->_traps > 0)
_fs->AddInstruction(_OP_POPTRAP, _fs->_traps, 0);
_fs->_returnexp = retexp;
_fs->AddInstruction(op, 1, _fs->PopTarget());
}
else{
if(op == _OP_RETURN && _fs->_traps > 0)
_fs->AddInstruction(_OP_POPTRAP, _fs->_traps ,0);
_fs->_returnexp = -1;
_fs->AddInstruction(op, 0xFF);
}
break;}
case TK_BREAK:
if(_fs->_breaktargets.size() <= 0)Error(_SC("'break' has to be in a loop block"));
if(_fs->_breaktargets.top() > 0){
_fs->AddInstruction(_OP_POPTRAP, _fs->_breaktargets.top(), 0);
}
_fs->AddInstruction(_OP_JMP, 0, -1234);
_fs->_unresolvedbreaks.push_back(_fs->GetCurrentPos());
Lex();
break;
case TK_CONTINUE:
if(_fs->_continuetargets.size() <= 0)Error(_SC("'continue' has to be in a loop block"));
if(_fs->_continuetargets.top() > 0) {
_fs->AddInstruction(_OP_POPTRAP, _fs->_continuetargets.top(), 0);
}
_fs->AddInstruction(_OP_JMP, 0, -1234);
_fs->_unresolvedcontinues.push_back(_fs->GetCurrentPos());
Lex();
break;
case TK_FUNCTION:
FunctionStatement();
break;
case TK_CLASS:
ClassStatement();
break;
case _SC('{'):{
SQInteger stacksize = _fs->GetStackSize();
Lex();
Statements();
Expect(_SC('}'));
_fs->SetStackSize(stacksize);
}
break;
case TK_TRY:
TryCatchStatement();
break;
case TK_THROW:
Lex();
CommaExpr();
_fs->AddInstruction(_OP_THROW, _fs->PopTarget());
break;
default:
CommaExpr();
_fs->PopTarget();
break;
}
_fs->SnoozeOpt();
}
void EmitDerefOp(SQOpcode op)
{
SQInteger val = _fs->PopTarget();
SQInteger key = _fs->PopTarget();
SQInteger src = _fs->PopTarget();
_fs->AddInstruction(op,_fs->PushTarget(),src,key,val);
}
void Emit2ArgsOP(SQOpcode op, SQInteger p3 = 0)
{
SQInteger p2 = _fs->PopTarget(); //src in OP_GET
SQInteger p1 = _fs->PopTarget(); //key in OP_GET
_fs->AddInstruction(op,_fs->PushTarget(), p1, p2, p3);
}
void EmitCompoundArith(SQInteger tok,bool deref)
{
SQInteger oper;
switch(tok){
case TK_MINUSEQ: oper = '-'; break;
case TK_PLUSEQ: oper = '+'; break;
case TK_MULEQ: oper = '*'; break;
case TK_DIVEQ: oper = '/'; break;
case TK_MODEQ: oper = '%'; break;
default: oper = 0; //shut up compiler
assert(0); break;
};
if(deref) {
SQInteger val = _fs->PopTarget();
SQInteger key = _fs->PopTarget();
SQInteger src = _fs->PopTarget();
//mixes dest obj and source val in the arg1(hack?)
_fs->AddInstruction(_OP_COMPARITH,_fs->PushTarget(),(src<<16)|val,key,oper);
}
else {
Emit2ArgsOP(_OP_COMPARITHL, oper);
}
}
void CommaExpr()
{
for(Expression();_token == ',';_fs->PopTarget(), Lex(), CommaExpr());
}
ExpState Expression(bool funcarg = false)
{
PushExpState();
_exst._class_or_delete = false;
_exst._funcarg = funcarg;
LogicalOrExp();
switch(_token) {
case _SC('='):
case TK_NEWSLOT:
case TK_MINUSEQ:
case TK_PLUSEQ:
case TK_MULEQ:
case TK_DIVEQ:
case TK_MODEQ:
{
SQInteger op = _token;
SQInteger ds = _exst._deref;
bool freevar = _exst._freevar;
if(ds == DEREF_NO_DEREF) Error(_SC("can't assign expression"));
Lex(); Expression();
switch(op){
case TK_NEWSLOT:
if(freevar) Error(_SC("free variables cannot be modified"));
if(ds == DEREF_FIELD)
EmitDerefOp(_OP_NEWSLOT);
else //if _derefstate != DEREF_NO_DEREF && DEREF_FIELD so is the index of a local
Error(_SC("can't 'create' a local slot"));
break;
case _SC('='): //ASSIGN
if(freevar) Error(_SC("free variables cannot be modified"));
if(ds == DEREF_FIELD)
EmitDerefOp(_OP_SET);
else {//if _derefstate != DEREF_NO_DEREF && DEREF_FIELD so is the index of a local
SQInteger p2 = _fs->PopTarget(); //src in OP_GET
SQInteger p1 = _fs->TopTarget(); //key in OP_GET
_fs->AddInstruction(_OP_MOVE, p1, p2);
}
break;
case TK_MINUSEQ:
case TK_PLUSEQ:
case TK_MULEQ:
case TK_DIVEQ:
case TK_MODEQ:
EmitCompoundArith(op,ds == DEREF_FIELD);
break;
}
}
break;
case _SC('?'): {
Lex();
_fs->AddInstruction(_OP_JZ, _fs->PopTarget());
SQInteger jzpos = _fs->GetCurrentPos();
SQInteger trg = _fs->PushTarget();
Expression();
SQInteger first_exp = _fs->PopTarget();
if(trg != first_exp) _fs->AddInstruction(_OP_MOVE, trg, first_exp);
SQInteger endfirstexp = _fs->GetCurrentPos();
_fs->AddInstruction(_OP_JMP, 0, 0);
Expect(_SC(':'));
SQInteger jmppos = _fs->GetCurrentPos();
Expression();
SQInteger second_exp = _fs->PopTarget();
if(trg != second_exp) _fs->AddInstruction(_OP_MOVE, trg, second_exp);
_fs->SetIntructionParam(jmppos, 1, _fs->GetCurrentPos() - jmppos);
_fs->SetIntructionParam(jzpos, 1, endfirstexp - jzpos + 1);
_fs->SnoozeOpt();
}
break;
}
return PopExpState();
}
void BIN_EXP(SQOpcode op, void (SQCompiler::*f)(void),SQInteger op3 = 0)
{
Lex(); (this->*f)();
SQInteger op1 = _fs->PopTarget();SQInteger op2 = _fs->PopTarget();
_fs->AddInstruction(op, _fs->PushTarget(), op1, op2, op3);
}
void LogicalOrExp()
{
LogicalAndExp();
for(;;) if(_token == TK_OR) {
SQInteger first_exp = _fs->PopTarget();
SQInteger trg = _fs->PushTarget();
_fs->AddInstruction(_OP_OR, trg, 0, first_exp, 0);
SQInteger jpos = _fs->GetCurrentPos();
if(trg != first_exp) _fs->AddInstruction(_OP_MOVE, trg, first_exp);
Lex(); LogicalOrExp();
_fs->SnoozeOpt();
SQInteger second_exp = _fs->PopTarget();
if(trg != second_exp) _fs->AddInstruction(_OP_MOVE, trg, second_exp);
_fs->SnoozeOpt();
_fs->SetIntructionParam(jpos, 1, (_fs->GetCurrentPos() - jpos));
break;
}else return;
}
void LogicalAndExp()
{
BitwiseOrExp();
for(;;) switch(_token) {
case TK_AND: {
SQInteger first_exp = _fs->PopTarget();
SQInteger trg = _fs->PushTarget();
_fs->AddInstruction(_OP_AND, trg, 0, first_exp, 0);
SQInteger jpos = _fs->GetCurrentPos();
if(trg != first_exp) _fs->AddInstruction(_OP_MOVE, trg, first_exp);
Lex(); LogicalAndExp();
_fs->SnoozeOpt();
SQInteger second_exp = _fs->PopTarget();
if(trg != second_exp) _fs->AddInstruction(_OP_MOVE, trg, second_exp);
_fs->SnoozeOpt();
_fs->SetIntructionParam(jpos, 1, (_fs->GetCurrentPos() - jpos));
break;
}
case TK_IN: BIN_EXP(_OP_EXISTS, &SQCompiler::BitwiseOrExp); break;
case TK_INSTANCEOF: BIN_EXP(_OP_INSTANCEOF, &SQCompiler::BitwiseOrExp); break;
default:
return;
}
}
void BitwiseOrExp()
{
BitwiseXorExp();
for(;;) if(_token == _SC('|'))
{BIN_EXP(_OP_BITW, &SQCompiler::BitwiseXorExp,BW_OR);
}else return;
}
void BitwiseXorExp()
{
BitwiseAndExp();
for(;;) if(_token == _SC('^'))
{BIN_EXP(_OP_BITW, &SQCompiler::BitwiseAndExp,BW_XOR);
}else return;
}
void BitwiseAndExp()
{
CompExp();
for(;;) if(_token == _SC('&'))
{BIN_EXP(_OP_BITW, &SQCompiler::CompExp,BW_AND);
}else return;
}
void CompExp()
{
ShiftExp();
for(;;) switch(_token) {
case TK_EQ: BIN_EXP(_OP_EQ, &SQCompiler::ShiftExp); break;
case _SC('>'): BIN_EXP(_OP_CMP, &SQCompiler::ShiftExp,CMP_G); break;
case _SC('<'): BIN_EXP(_OP_CMP, &SQCompiler::ShiftExp,CMP_L); break;
case TK_GE: BIN_EXP(_OP_CMP, &SQCompiler::ShiftExp,CMP_GE); break;
case TK_LE: BIN_EXP(_OP_CMP, &SQCompiler::ShiftExp,CMP_LE); break;
case TK_NE: BIN_EXP(_OP_NE, &SQCompiler::ShiftExp); break;
default: return;
}
}
void ShiftExp()
{
PlusExp();
for(;;) switch(_token) {
case TK_USHIFTR: BIN_EXP(_OP_BITW, &SQCompiler::PlusExp,BW_USHIFTR); break;
case TK_SHIFTL: BIN_EXP(_OP_BITW, &SQCompiler::PlusExp,BW_SHIFTL); break;
case TK_SHIFTR: BIN_EXP(_OP_BITW, &SQCompiler::PlusExp,BW_SHIFTR); break;
default: return;
}
}
void PlusExp()
{
MultExp();
for(;;) switch(_token) {
case _SC('+'): case _SC('-'):
BIN_EXP(_OP_ARITH, &SQCompiler::MultExp,_token); break;
default: return;
}
}
void MultExp()
{
PrefixedExpr();
for(;;) switch(_token) {
case _SC('*'): case _SC('/'): case _SC('%'):
BIN_EXP(_OP_ARITH, &SQCompiler::PrefixedExpr,_token); break;
default: return;
}
}
//if 'pos' != -1 the previous variable is a local variable
void PrefixedExpr()
{
SQInteger pos = Factor();
for(;;) {
switch(_token) {
case _SC('.'): {
pos = -1;
Lex();
if(_token == TK_PARENT) {
Lex();
if(!NeedGet())
Error(_SC("parent cannot be set"));
SQInteger src = _fs->PopTarget();
_fs->AddInstruction(_OP_GETPARENT, _fs->PushTarget(), src);
}
else {
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(Expect(TK_IDENTIFIER)));
if(NeedGet()) Emit2ArgsOP(_OP_GET);
}
_exst._deref = DEREF_FIELD;
_exst._freevar = false;
}
break;
case _SC('['):
if(_lex._prevtoken == _SC('\n')) Error(_SC("cannot brake deref/or comma needed after [exp]=exp slot declaration"));
Lex(); Expression(); Expect(_SC(']'));
pos = -1;
if(NeedGet()) Emit2ArgsOP(_OP_GET);
_exst._deref = DEREF_FIELD;
_exst._freevar = false;
break;
case TK_MINUSMINUS:
case TK_PLUSPLUS:
if(_exst._deref != DEREF_NO_DEREF && !IsEndOfStatement()) {
SQInteger tok = _token; Lex();
if(pos < 0)
Emit2ArgsOP(_OP_PINC,tok == TK_MINUSMINUS?-1:1);
else {//if _derefstate != DEREF_NO_DEREF && DEREF_FIELD so is the index of a local
SQInteger src = _fs->PopTarget();
_fs->AddInstruction(_OP_PINCL, _fs->PushTarget(), src, 0, tok == TK_MINUSMINUS?-1:1);
}
}
return;
break;
case _SC('('):
{
if(_exst._deref != DEREF_NO_DEREF) {
if(pos<0) {
SQInteger key = _fs->PopTarget(); //key
SQInteger table = _fs->PopTarget(); //table etc...
SQInteger closure = _fs->PushTarget();
SQInteger ttarget = _fs->PushTarget();
_fs->AddInstruction(_OP_PREPCALL, closure, key, table, ttarget);
}
else{
_fs->AddInstruction(_OP_MOVE, _fs->PushTarget(), 0);
}
}
else
_fs->AddInstruction(_OP_MOVE, _fs->PushTarget(), 0);
_exst._deref = DEREF_NO_DEREF;
Lex();
FunctionCallArgs();
}
break;
default: return;
}
}
}
SQInteger Factor()
{
switch(_token)
{
case TK_STRING_LITERAL: {
//SQObjectPtr id(SQString::Create(_ss(_vm), _lex._svalue,_lex._longstr.size()-1));
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(_fs->CreateString(_lex._svalue,_lex._longstr.size()-1)));
Lex();
}
break;
case TK_VARGC: Lex(); _fs->AddInstruction(_OP_VARGC, _fs->PushTarget()); break;
case TK_VARGV: { Lex();
Expect(_SC('['));
Expression();
Expect(_SC(']'));
SQInteger src = _fs->PopTarget();
_fs->AddInstruction(_OP_GETVARGV, _fs->PushTarget(), src);
}
break;
case TK_IDENTIFIER:
case TK_CONSTRUCTOR:
case TK_THIS:{
_exst._freevar = false;
SQObject id;
switch(_token) {
case TK_IDENTIFIER: id = _fs->CreateString(_lex._svalue); break;
case TK_THIS: id = _fs->CreateString(_SC("this")); break;
case TK_CONSTRUCTOR: id = _fs->CreateString(_SC("constructor")); break;
}
SQInteger pos = -1;
Lex();
if((pos = _fs->GetLocalVariable(id)) == -1) {
//checks if is a free variable
if((pos = _fs->GetOuterVariable(id)) != -1) {
_exst._deref = _fs->PushTarget();
_fs->AddInstruction(_OP_LOADFREEVAR, _exst._deref ,pos);
_exst._freevar = true;
} else {
_fs->PushTarget(0);
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(id));
if(NeedGet()) Emit2ArgsOP(_OP_GET);
_exst._deref = DEREF_FIELD;
}
}
else{
_fs->PushTarget(pos);
_exst._deref = pos;
}
return _exst._deref;
}
break;
case TK_PARENT: Lex();_fs->AddInstruction(_OP_GETPARENT, _fs->PushTarget(), 0); break;
case TK_DOUBLE_COLON: // "::"
_fs->AddInstruction(_OP_LOADROOTTABLE, _fs->PushTarget());
_exst._deref = DEREF_FIELD;
_token = _SC('.'); //hack
return -1;
break;
case TK_NULL:
_fs->AddInstruction(_OP_LOADNULLS, _fs->PushTarget(),1);
Lex();
break;
case TK_INTEGER: {
if((_lex._nvalue & (~0x7FFFFFFF)) == 0) { //does it fit in 32 bits?
_fs->AddInstruction(_OP_LOADINT, _fs->PushTarget(),_lex._nvalue);
}
else {
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetNumericConstant(_lex._nvalue));
}
Lex();
}
break;
case TK_FLOAT:
if(sizeof(SQFloat) == sizeof(SQInt32)) {
_fs->AddInstruction(_OP_LOADFLOAT, _fs->PushTarget(),*((SQInt32 *)&_lex._fvalue));
}
else {
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetNumericConstant(_lex._fvalue));
}
Lex();
break;
case TK_TRUE: case TK_FALSE:
_fs->AddInstruction(_OP_LOADBOOL, _fs->PushTarget(),_token == TK_TRUE?1:0);
Lex();
break;
case _SC('['): {
_fs->AddInstruction(_OP_NEWARRAY, _fs->PushTarget());
SQInteger apos = _fs->GetCurrentPos(),key = 0;
Lex();
while(_token != _SC(']')) {
Expression();
if(_token == _SC(',')) Lex();
SQInteger val = _fs->PopTarget();
SQInteger array = _fs->TopTarget();
_fs->AddInstruction(_OP_APPENDARRAY, array, val);
key++;
}
_fs->SetIntructionParam(apos, 1, key);
Lex();
}
break;
case _SC('{'):{
_fs->AddInstruction(_OP_NEWTABLE, _fs->PushTarget());
Lex();ParseTableOrClass(_SC(','));
}
break;
case TK_FUNCTION: FunctionExp(_token);break;
case TK_CLASS: Lex(); ClassExp();break;
case _SC('-'): UnaryOP(_OP_NEG); break;
case _SC('!'): UnaryOP(_OP_NOT); break;
case _SC('~'): UnaryOP(_OP_BWNOT); break;
case TK_TYPEOF : UnaryOP(_OP_TYPEOF); break;
case TK_RESUME : UnaryOP(_OP_RESUME); break;
case TK_CLONE : UnaryOP(_OP_CLONE); break;
case TK_MINUSMINUS :
case TK_PLUSPLUS :PrefixIncDec(_token); break;
case TK_DELETE : DeleteExpr(); break;
case TK_DELEGATE : DelegateExpr(); break;
case _SC('('): Lex(); CommaExpr(); Expect(_SC(')'));
break;
default: Error(_SC("expression expected"));
}
return -1;
}
void UnaryOP(SQOpcode op)
{
Lex(); PrefixedExpr();
SQInteger src = _fs->PopTarget();
_fs->AddInstruction(op, _fs->PushTarget(), src);
}
bool NeedGet()
{
switch(_token) {
case _SC('='): case _SC('('): case TK_NEWSLOT: case TK_PLUSPLUS: case TK_MINUSMINUS:
case TK_PLUSEQ: case TK_MINUSEQ: case TK_MULEQ: case TK_DIVEQ: case TK_MODEQ:
return false;
}
return (!_exst._class_or_delete) || (_exst._class_or_delete && (_token == _SC('.') || _token == _SC('[')));
}
void FunctionCallArgs()
{
SQInteger nargs = 1;//this
while(_token != _SC(')')) {
Expression(true);
MoveIfCurrentTargetIsLocal();
nargs++;
if(_token == _SC(',')){
Lex();
if(_token == ')') Error(_SC("expression expected, found ')'"));
}
}
Lex();
for(SQInteger i = 0; i < (nargs - 1); i++) _fs->PopTarget();
SQInteger stackbase = _fs->PopTarget();
SQInteger closure = _fs->PopTarget();
_fs->AddInstruction(_OP_CALL, _fs->PushTarget(), closure, stackbase, nargs);
}
void ParseTableOrClass(SQInteger separator,SQInteger terminator = '}')
{
SQInteger tpos = _fs->GetCurrentPos(),nkeys = 0;
while(_token != terminator) {
bool hasattrs = false;
bool isstatic = false;
//check if is an attribute
if(separator == ';') {
if(_token == TK_ATTR_OPEN) {
_fs->AddInstruction(_OP_NEWTABLE, _fs->PushTarget()); Lex();
ParseTableOrClass(',',TK_ATTR_CLOSE);
hasattrs = true;
}
if(_token == TK_STATIC) {
isstatic = true;
Lex();
}
}
switch(_token) {
case TK_FUNCTION:
case TK_CONSTRUCTOR:{
SQInteger tk = _token;
Lex();
SQObject id = tk == TK_FUNCTION ? Expect(TK_IDENTIFIER) : _fs->CreateString(_SC("constructor"));
Expect(_SC('('));
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(id));
CreateFunction(id);
_fs->AddInstruction(_OP_CLOSURE, _fs->PushTarget(), _fs->_functions.size() - 1, 0);
}
break;
case _SC('['):
Lex(); CommaExpr(); Expect(_SC(']'));
Expect(_SC('=')); Expression();
break;
default :
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(Expect(TK_IDENTIFIER)));
Expect(_SC('=')); Expression();
}
if(_token == separator) Lex();//optional comma/semicolon
nkeys++;
SQInteger val = _fs->PopTarget();
SQInteger key = _fs->PopTarget();
SQInteger attrs = hasattrs ? _fs->PopTarget():-1;
assert(hasattrs && attrs == key-1 || !hasattrs);
unsigned char flags = (hasattrs?NEW_SLOT_ATTRIBUTES_FLAG:0)|(isstatic?NEW_SLOT_STATIC_FLAG:0);
SQInteger table = _fs->TopTarget(); //<<BECAUSE OF THIS NO COMMON EMIT FUNC IS POSSIBLE
_fs->AddInstruction(_OP_NEWSLOTA, flags, table, key, val);
//_fs->PopTarget();
}
if(separator == _SC(',')) //hack recognizes a table from the separator
_fs->SetIntructionParam(tpos, 1, nkeys);
Lex();
}
void LocalDeclStatement()
{
SQObject varname;
do {
Lex(); varname = Expect(TK_IDENTIFIER);
if(_token == _SC('=')) {
Lex(); Expression();
SQInteger src = _fs->PopTarget();
SQInteger dest = _fs->PushTarget();
if(dest != src) _fs->AddInstruction(_OP_MOVE, dest, src);
}
else{
_fs->AddInstruction(_OP_LOADNULLS, _fs->PushTarget(),1);
}
_fs->PopTarget();
_fs->PushLocalVariable(varname);
} while(_token == _SC(','));
}
void IfStatement()
{
SQInteger jmppos;
bool haselse = false;
Lex(); Expect(_SC('(')); CommaExpr(); Expect(_SC(')'));
_fs->AddInstruction(_OP_JZ, _fs->PopTarget());
SQInteger jnepos = _fs->GetCurrentPos();
SQInteger stacksize = _fs->GetStackSize();
Statement();
//
if(_token != _SC('}') && _token != TK_ELSE) OptionalSemicolon();
CleanStack(stacksize);
SQInteger endifblock = _fs->GetCurrentPos();
if(_token == TK_ELSE){
haselse = true;
stacksize = _fs->GetStackSize();
_fs->AddInstruction(_OP_JMP);
jmppos = _fs->GetCurrentPos();
Lex();
Statement(); OptionalSemicolon();
CleanStack(stacksize);
_fs->SetIntructionParam(jmppos, 1, _fs->GetCurrentPos() - jmppos);
}
_fs->SetIntructionParam(jnepos, 1, endifblock - jnepos + (haselse?1:0));
}
void WhileStatement()
{
SQInteger jzpos, jmppos;
SQInteger stacksize = _fs->GetStackSize();
jmppos = _fs->GetCurrentPos();
Lex(); Expect(_SC('(')); CommaExpr(); Expect(_SC(')'));
BEGIN_BREAKBLE_BLOCK();
_fs->AddInstruction(_OP_JZ, _fs->PopTarget());
jzpos = _fs->GetCurrentPos();
stacksize = _fs->GetStackSize();
Statement();
CleanStack(stacksize);
_fs->AddInstruction(_OP_JMP, 0, jmppos - _fs->GetCurrentPos() - 1);
_fs->SetIntructionParam(jzpos, 1, _fs->GetCurrentPos() - jzpos);
END_BREAKBLE_BLOCK(jmppos);
}
void DoWhileStatement()
{
Lex();
SQInteger jzpos = _fs->GetCurrentPos();
SQInteger stacksize = _fs->GetStackSize();
BEGIN_BREAKBLE_BLOCK()
Statement();
CleanStack(stacksize);
Expect(TK_WHILE);
SQInteger continuetrg = _fs->GetCurrentPos();
Expect(_SC('(')); CommaExpr(); Expect(_SC(')'));
_fs->AddInstruction(_OP_JNZ, _fs->PopTarget(), jzpos - _fs->GetCurrentPos() - 1);
END_BREAKBLE_BLOCK(continuetrg);
}
void ForStatement()
{
Lex();
SQInteger stacksize = _fs->GetStackSize();
Expect(_SC('('));
if(_token == TK_LOCAL) LocalDeclStatement();
else if(_token != _SC(';')){
CommaExpr();
_fs->PopTarget();
}
Expect(_SC(';'));
_fs->SnoozeOpt();
SQInteger jmppos = _fs->GetCurrentPos();
SQInteger jzpos = -1;
if(_token != _SC(';')) { CommaExpr(); _fs->AddInstruction(_OP_JZ, _fs->PopTarget()); jzpos = _fs->GetCurrentPos(); }
Expect(_SC(';'));
_fs->SnoozeOpt();
SQInteger expstart = _fs->GetCurrentPos() + 1;
if(_token != _SC(')')) {
CommaExpr();
_fs->PopTarget();
}
Expect(_SC(')'));
_fs->SnoozeOpt();
SQInteger expend = _fs->GetCurrentPos();
SQInteger expsize = (expend - expstart) + 1;
SQInstructionVec exp;
if(expsize > 0) {
for(SQInteger i = 0; i < expsize; i++)
exp.push_back(_fs->GetInstruction(expstart + i));
_fs->PopInstructions(expsize);
}
BEGIN_BREAKBLE_BLOCK()
Statement();
SQInteger continuetrg = _fs->GetCurrentPos();
if(expsize > 0) {
for(SQInteger i = 0; i < expsize; i++)
_fs->AddInstruction(exp[i]);
}
_fs->AddInstruction(_OP_JMP, 0, jmppos - _fs->GetCurrentPos() - 1, 0);
if(jzpos> 0) _fs->SetIntructionParam(jzpos, 1, _fs->GetCurrentPos() - jzpos);
CleanStack(stacksize);
END_BREAKBLE_BLOCK(continuetrg);
}
void ForEachStatement()
{
SQObject idxname, valname;
Lex(); Expect(_SC('(')); valname = Expect(TK_IDENTIFIER);
if(_token == _SC(',')) {
idxname = valname;
Lex(); valname = Expect(TK_IDENTIFIER);
}
else{
idxname = _fs->CreateString(_SC("@INDEX@"));
}
Expect(TK_IN);
//save the stack size
SQInteger stacksize = _fs->GetStackSize();
//put the table in the stack(evaluate the table expression)
Expression(); Expect(_SC(')'));
SQInteger container = _fs->TopTarget();
//push the index local var
SQInteger indexpos = _fs->PushLocalVariable(idxname);
_fs->AddInstruction(_OP_LOADNULLS, indexpos,1);
//push the value local var
SQInteger valuepos = _fs->PushLocalVariable(valname);
_fs->AddInstruction(_OP_LOADNULLS, valuepos,1);
//push reference index
SQInteger itrpos = _fs->PushLocalVariable(_fs->CreateString(_SC("@ITERATOR@"))); //use invalid id to make it inaccessible
_fs->AddInstruction(_OP_LOADNULLS, itrpos,1);
SQInteger jmppos = _fs->GetCurrentPos();
_fs->AddInstruction(_OP_FOREACH, container, 0, indexpos);
SQInteger foreachpos = _fs->GetCurrentPos();
//generate the statement code
BEGIN_BREAKBLE_BLOCK()
Statement();
_fs->AddInstruction(_OP_JMP, 0, jmppos - _fs->GetCurrentPos() - 1);
_fs->SetIntructionParam(foreachpos, 1, _fs->GetCurrentPos() - foreachpos);
//restore the local variable stack(remove index,val and ref idx)
CleanStack(stacksize);
END_BREAKBLE_BLOCK(foreachpos - 1);
}
void SwitchStatement()
{
Lex(); Expect(_SC('(')); CommaExpr(); Expect(_SC(')'));
Expect(_SC('{'));
SQInteger expr = _fs->TopTarget();
bool bfirst = true;
SQInteger tonextcondjmp = -1;
SQInteger skipcondjmp = -1;
SQInteger __nbreaks__ = _fs->_unresolvedbreaks.size();
_fs->_breaktargets.push_back(0);
while(_token == TK_CASE) {
//_fs->AddLineInfos(_lex._currentline, _lineinfo); think about this one
if(!bfirst) {
_fs->AddInstruction(_OP_JMP, 0, 0);
skipcondjmp = _fs->GetCurrentPos();
_fs->SetIntructionParam(tonextcondjmp, 1, _fs->GetCurrentPos() - tonextcondjmp);
}
//condition
Lex(); Expression(); Expect(_SC(':'));
SQInteger trg = _fs->PopTarget();
_fs->AddInstruction(_OP_EQ, trg, trg, expr);
_fs->AddInstruction(_OP_JZ, trg, 0);
//end condition
if(skipcondjmp != -1) {
_fs->SetIntructionParam(skipcondjmp, 1, (_fs->GetCurrentPos() - skipcondjmp));
}
tonextcondjmp = _fs->GetCurrentPos();
SQInteger stacksize = _fs->GetStackSize();
Statements();
_fs->SetStackSize(stacksize);
bfirst = false;
}
if(tonextcondjmp != -1)
_fs->SetIntructionParam(tonextcondjmp, 1, _fs->GetCurrentPos() - tonextcondjmp);
if(_token == TK_DEFAULT) {
// _fs->AddLineInfos(_lex._currentline, _lineinfo);
Lex(); Expect(_SC(':'));
SQInteger stacksize = _fs->GetStackSize();
Statements();
_fs->SetStackSize(stacksize);
}
Expect(_SC('}'));
_fs->PopTarget();
__nbreaks__ = _fs->_unresolvedbreaks.size() - __nbreaks__;
if(__nbreaks__ > 0)ResolveBreaks(_fs, __nbreaks__);
_fs->_breaktargets.pop_back();
}
void FunctionStatement()
{
SQObject id;
Lex(); id = Expect(TK_IDENTIFIER);
_fs->PushTarget(0);
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(id));
if(_token == TK_DOUBLE_COLON) Emit2ArgsOP(_OP_GET);
while(_token == TK_DOUBLE_COLON) {
Lex();
id = Expect(TK_IDENTIFIER);
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(id));
if(_token == TK_DOUBLE_COLON) Emit2ArgsOP(_OP_GET);
}
Expect(_SC('('));
CreateFunction(id);
_fs->AddInstruction(_OP_CLOSURE, _fs->PushTarget(), _fs->_functions.size() - 1, 0);
EmitDerefOp(_OP_NEWSLOT);
_fs->PopTarget();
}
void ClassStatement()
{
ExpState es;
Lex(); PushExpState();
_exst._class_or_delete = true;
_exst._funcarg = false;
PrefixedExpr();
es = PopExpState();
if(es._deref == DEREF_NO_DEREF) Error(_SC("invalid class name"));
if(es._deref == DEREF_FIELD) {
ClassExp();
EmitDerefOp(_OP_NEWSLOT);
_fs->PopTarget();
}
else Error(_SC("cannot create a class in a local with the syntax(class <local>)"));
}
void TryCatchStatement()
{
SQObject exid;
Lex();
_fs->AddInstruction(_OP_PUSHTRAP,0,0);
_fs->_traps++;
if(_fs->_breaktargets.size()) _fs->_breaktargets.top()++;
if(_fs->_continuetargets.size()) _fs->_continuetargets.top()++;
SQInteger trappos = _fs->GetCurrentPos();
Statement();
_fs->_traps--;
_fs->AddInstruction(_OP_POPTRAP, 1, 0);
if(_fs->_breaktargets.size()) _fs->_breaktargets.top()--;
if(_fs->_continuetargets.size()) _fs->_continuetargets.top()--;
_fs->AddInstruction(_OP_JMP, 0, 0);
SQInteger jmppos = _fs->GetCurrentPos();
_fs->SetIntructionParam(trappos, 1, (_fs->GetCurrentPos() - trappos));
Expect(TK_CATCH); Expect(_SC('(')); exid = Expect(TK_IDENTIFIER); Expect(_SC(')'));
SQInteger stacksize = _fs->GetStackSize();
SQInteger ex_target = _fs->PushLocalVariable(exid);
_fs->SetIntructionParam(trappos, 0, ex_target);
Statement();
_fs->SetIntructionParams(jmppos, 0, (_fs->GetCurrentPos() - jmppos), 0);
CleanStack(stacksize);
}
void FunctionExp(SQInteger ftype)
{
Lex(); Expect(_SC('('));
CreateFunction(_null_);
_fs->AddInstruction(_OP_CLOSURE, _fs->PushTarget(), _fs->_functions.size() - 1, ftype == TK_FUNCTION?0:1);
}
void ClassExp()
{
SQInteger base = -1;
SQInteger attrs = -1;
if(_token == TK_EXTENDS) {
Lex(); Expression();
base = _fs->TopTarget();
}
if(_token == TK_ATTR_OPEN) {
Lex();
_fs->AddInstruction(_OP_NEWTABLE, _fs->PushTarget());
ParseTableOrClass(_SC(','),TK_ATTR_CLOSE);
attrs = _fs->TopTarget();
}
Expect(_SC('{'));
if(attrs != -1) _fs->PopTarget();
if(base != -1) _fs->PopTarget();
_fs->AddInstruction(_OP_CLASS, _fs->PushTarget(), base, attrs);
ParseTableOrClass(_SC(';'));
}
void DelegateExpr()
{
Lex(); CommaExpr();
Expect(_SC(':'));
CommaExpr();
SQInteger table = _fs->PopTarget(), delegate = _fs->PopTarget();
_fs->AddInstruction(_OP_DELEGATE, _fs->PushTarget(), table, delegate);
}
void DeleteExpr()
{
ExpState es;
Lex(); PushExpState();
_exst._class_or_delete = true;
_exst._funcarg = false;
PrefixedExpr();
es = PopExpState();
if(es._deref == DEREF_NO_DEREF) Error(_SC("can't delete an expression"));
if(es._deref == DEREF_FIELD) Emit2ArgsOP(_OP_DELETE);
else Error(_SC("cannot delete a local"));
}
void PrefixIncDec(SQInteger token)
{
ExpState es;
Lex(); PushExpState();
_exst._class_or_delete = true;
_exst._funcarg = false;
PrefixedExpr();
es = PopExpState();
if(es._deref == DEREF_FIELD) Emit2ArgsOP(_OP_INC,token == TK_MINUSMINUS?-1:1);
else {
SQInteger src = _fs->PopTarget();
_fs->AddInstruction(_OP_INCL, _fs->PushTarget(), src, 0, token == TK_MINUSMINUS?-1:1);
}
}
void CreateFunction(SQObject &name)
{
SQFuncState *funcstate = _fs->PushChildState(_ss(_vm));
funcstate->_name = name;
SQObject paramname;
funcstate->AddParameter(_fs->CreateString(_SC("this")));
funcstate->_sourcename = _sourcename;
while(_token!=_SC(')')) {
if(_token == TK_VARPARAMS) {
funcstate->_varparams = true;
Lex();
if(_token != _SC(')')) Error(_SC("expected ')'"));
break;
}
else {
paramname = Expect(TK_IDENTIFIER);
funcstate->AddParameter(paramname);
if(_token == _SC(',')) Lex();
else if(_token != _SC(')')) Error(_SC("expected ')' or ','"));
}
}
Expect(_SC(')'));
//outer values
if(_token == _SC(':')) {
Lex(); Expect(_SC('('));
while(_token != _SC(')')) {
paramname = Expect(TK_IDENTIFIER);
//outers are treated as implicit local variables
funcstate->AddOuterValue(paramname);
if(_token == _SC(',')) Lex();
else if(_token != _SC(')')) Error(_SC("expected ')' or ','"));
}
Lex();
}
SQFuncState *currchunk = _fs;
_fs = funcstate;
Statement();
funcstate->AddLineInfos(_lex._prevtoken == _SC('\n')?_lex._lasttokenline:_lex._currentline, _lineinfo, true);
funcstate->AddInstruction(_OP_RETURN, -1);
funcstate->SetStackSize(0);
//_fs->->_stacksize = _fs->_stacksize;
SQFunctionProto *func = funcstate->BuildProto();
#ifdef _DEBUG_DUMP
funcstate->Dump(func);
#endif
_fs = currchunk;
_fs->_functions.push_back(func);
_fs->PopChildState();
}
void CleanStack(SQInteger stacksize)
{
if(_fs->GetStackSize() != stacksize)
_fs->SetStackSize(stacksize);
}
void ResolveBreaks(SQFuncState *funcstate, SQInteger ntoresolve)
{
while(ntoresolve > 0) {
SQInteger pos = funcstate->_unresolvedbreaks.back();
funcstate->_unresolvedbreaks.pop_back();
//set the jmp instruction
funcstate->SetIntructionParams(pos, 0, funcstate->GetCurrentPos() - pos, 0);
ntoresolve--;
}
}
void ResolveContinues(SQFuncState *funcstate, SQInteger ntoresolve, SQInteger targetpos)
{
while(ntoresolve > 0) {
SQInteger pos = funcstate->_unresolvedcontinues.back();
funcstate->_unresolvedcontinues.pop_back();
//set the jmp instruction
funcstate->SetIntructionParams(pos, 0, targetpos - pos, 0);
ntoresolve--;
}
}
private:
SQInteger _token;
SQFuncState *_fs;
SQObjectPtr _sourcename;
SQLexer _lex;
bool _lineinfo;
bool _raiseerror;
SQInteger _debugline;
SQInteger _debugop;
ExpStateVec _expstates;
SQChar *compilererror;
jmp_buf _errorjmp;
SQVM *_vm;
};
bool Compile(SQVM *vm,SQLEXREADFUNC rg, SQUserPointer up, const SQChar *sourcename, SQObjectPtr &out, bool raiseerror, bool lineinfo)
{
SQCompiler p(vm, rg, up, sourcename, raiseerror, lineinfo);
return p.Compile(out);
}
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