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cuberite-2a/squirrel_3_0_1_stable/squirrel/sqcompiler.cpp
cedeel@gmail.com 92c59963f8 Attempt to bring sanity to newlines across systems. 
git-svn-id: http://mc-server.googlecode.com/svn/trunk@606 0a769ca7-a7f5-676a-18bf-c427514a06d6
2012-06-14 13:06:06 +00:00

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/*
see copyright notice in squirrel.h
*/
#include "sqpcheader.h"
#ifndef NO_COMPILER
#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"
#include "sqtable.h"
#define EXPR 1
#define OBJECT 2
#define BASE 3
#define LOCAL 4
#define OUTER 5
struct SQExpState {
SQInteger etype; /* expr. type; one of EXPR, OBJECT, BASE, OUTER or LOCAL */
SQInteger epos; /* expr. location on stack; -1 for OBJECT and BASE */
bool donot_get; /* signal not to deref the next value */
};
struct SQScope {
SQInteger outers;
SQInteger stacksize;
};
#define BEGIN_SCOPE() SQScope __oldscope__ = _scope; \
_scope.outers = _fs->_outers; \
_scope.stacksize = _fs->GetStackSize();
#define RESOLVE_OUTERS() if(_fs->GetStackSize() != _scope.stacksize) { \
if(_fs->CountOuters(_scope.stacksize)) { \
_fs->AddInstruction(_OP_CLOSE,0,_scope.stacksize); \
} \
}
#define END_SCOPE_NO_CLOSE() { if(_fs->GetStackSize() != _scope.stacksize) { \
_fs->SetStackSize(_scope.stacksize); \
} \
_scope = __oldscope__; \
}
#define END_SCOPE() { SQInteger oldouters = _fs->_outers;\
if(_fs->GetStackSize() != _scope.stacksize) { \
_fs->SetStackSize(_scope.stacksize); \
if(oldouters != _fs->_outers) { \
_fs->AddInstruction(_OP_CLOSE,0,_scope.stacksize); \
} \
} \
_scope = __oldscope__; \
}
#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;
_scope.outers = 0;
_scope.stacksize = 0;
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();}
SQObject Expect(SQInteger tok)
{
if(_token != tok) {
if(_token == TK_CONSTRUCTOR && tok == TK_IDENTIFIER) {
//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->AddParameter(_fs->CreateString(_SC("vargv")));
_fs->_varparams = true;
_fs->_sourcename = _sourcename;
SQInteger stacksize = _fs->GetStackSize();
if(setjmp(_errorjmp) == 0) {
Lex();
while(_token > 0){
Statement();
if(_lex._prevtoken != _SC('}') && _lex._prevtoken != _SC(';')) OptionalSemicolon();
}
_fs->SetStackSize(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(bool closeframe = true)
{
_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(),_fs->GetStackSize());
}
else{
if(op == _OP_RETURN && _fs->_traps > 0)
_fs->AddInstruction(_OP_POPTRAP, _fs->_traps ,0);
_fs->_returnexp = -1;
_fs->AddInstruction(op, 0xFF,0,_fs->GetStackSize());
}
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);
}
RESOLVE_OUTERS();
_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);
}
RESOLVE_OUTERS();
_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 TK_ENUM:
EnumStatement();
break;
case _SC('{'):{
BEGIN_SCOPE();
Lex();
Statements();
Expect(_SC('}'));
if(closeframe) {
END_SCOPE();
}
else {
END_SCOPE_NO_CLOSE();
}
}
break;
case TK_TRY:
TryCatchStatement();
break;
case TK_THROW:
Lex();
CommaExpr();
_fs->AddInstruction(_OP_THROW, _fs->PopTarget());
break;
case TK_CONST:
{
Lex();
SQObject id = Expect(TK_IDENTIFIER);
Expect('=');
SQObject val = ExpectScalar();
OptionalSemicolon();
SQTable *enums = _table(_ss(_vm)->_consts);
SQObjectPtr strongid = id;
enums->NewSlot(strongid,SQObjectPtr(val));
strongid.Null();
}
break;
default:
CommaExpr();
_fs->DiscardTarget();
//_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, SQInteger etype, SQInteger pos)
{
/* Generate code depending on the expression type */
switch(etype) {
case LOCAL:{
SQInteger p2 = _fs->PopTarget(); //src in OP_GET
SQInteger p1 = _fs->PopTarget(); //key in OP_GET
_fs->PushTarget(p1);
//EmitCompArithLocal(tok, p1, p1, p2);
_fs->AddInstruction(ChooseArithOpByToken(tok),p1, p2, p1, 0);
}
break;
case OBJECT:
case BASE:
{
SQInteger val = _fs->PopTarget();
SQInteger key = _fs->PopTarget();
SQInteger src = _fs->PopTarget();
/* _OP_COMPARITH mixes dest obj and source val in the arg1 */
_fs->AddInstruction(_OP_COMPARITH, _fs->PushTarget(), (src<<16)|val, key, ChooseCompArithCharByToken(tok));
}
break;
case OUTER:
{
SQInteger val = _fs->TopTarget();
SQInteger tmp = _fs->PushTarget();
_fs->AddInstruction(_OP_GETOUTER, tmp, pos);
_fs->AddInstruction(ChooseArithOpByToken(tok), tmp, val, tmp, 0);
_fs->AddInstruction(_OP_SETOUTER, tmp, pos, tmp);
}
break;
}
}
void CommaExpr()
{
for(Expression();_token == ',';_fs->PopTarget(), Lex(), CommaExpr());
}
void Expression()
{
SQExpState es = _es;
_es.etype = EXPR;
_es.epos = -1;
_es.donot_get = false;
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 = _es.etype;
SQInteger pos = _es.epos;
if(ds == EXPR) Error(_SC("can't assign expression"));
Lex(); Expression();
switch(op){
case TK_NEWSLOT:
if(ds == OBJECT || ds == BASE)
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
switch(ds) {
case LOCAL:
{
SQInteger src = _fs->PopTarget();
SQInteger dst = _fs->TopTarget();
_fs->AddInstruction(_OP_MOVE, dst, src);
}
break;
case OBJECT:
case BASE:
EmitDerefOp(_OP_SET);
break;
case OUTER:
{
SQInteger src = _fs->PopTarget();
SQInteger dst = _fs->PushTarget();
_fs->AddInstruction(_OP_SETOUTER, dst, pos, src);
}
}
break;
case TK_MINUSEQ:
case TK_PLUSEQ:
case TK_MULEQ:
case TK_DIVEQ:
case TK_MODEQ:
EmitCompoundArith(op, ds, pos);
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;
}
_es = es;
}
template<typename T> void BIN_EXP(SQOpcode op, T f,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()
{
EqExp();
for(;;) if(_token == _SC('&'))
{BIN_EXP(_OP_BITW, &SQCompiler::EqExp,BW_AND);
}else return;
}
void EqExp()
{
CompExp();
for(;;) switch(_token) {
case TK_EQ: BIN_EXP(_OP_EQ, &SQCompiler::CompExp); break;
case TK_NE: BIN_EXP(_OP_NE, &SQCompiler::CompExp); break;
case TK_3WAYSCMP: BIN_EXP(_OP_CMP, &SQCompiler::CompExp,CMP_3W); break;
default: return;
}
}
void CompExp()
{
ShiftExp();
for(;;) switch(_token) {
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;
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;
}
}
SQOpcode ChooseArithOpByToken(SQInteger tok)
{
switch(tok) {
case TK_PLUSEQ: case '+': return _OP_ADD;
case TK_MINUSEQ: case '-': return _OP_SUB;
case TK_MULEQ: case '*': return _OP_MUL;
case TK_DIVEQ: case '/': return _OP_DIV;
case TK_MODEQ: case '%': return _OP_MOD;
default: assert(0);
}
return _OP_ADD;
}
SQInteger ChooseCompArithCharByToken(SQInteger tok)
{
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;
};
return oper;
}
void PlusExp()
{
MultExp();
for(;;) switch(_token) {
case _SC('+'): case _SC('-'):
BIN_EXP(ChooseArithOpByToken(_token), &SQCompiler::MultExp); break;
default: return;
}
}
void MultExp()
{
PrefixedExpr();
for(;;) switch(_token) {
case _SC('*'): case _SC('/'): case _SC('%'):
BIN_EXP(ChooseArithOpByToken(_token), &SQCompiler::PrefixedExpr); 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();
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(Expect(TK_IDENTIFIER)));
if(_es.etype==BASE) {
Emit2ArgsOP(_OP_GET);
pos = _fs->TopTarget();
_es.etype = EXPR;
_es.epos = pos;
}
else {
if(NeedGet()) {
Emit2ArgsOP(_OP_GET);
}
_es.etype = OBJECT;
}
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(_es.etype==BASE) {
Emit2ArgsOP(_OP_GET);
pos = _fs->TopTarget();
_es.etype = EXPR;
_es.epos = pos;
}
else {
if(NeedGet()) {
Emit2ArgsOP(_OP_GET);
}
_es.etype = OBJECT;
}
break;
case TK_MINUSMINUS:
case TK_PLUSPLUS:
{
if(IsEndOfStatement()) return;
SQInteger diff = (_token==TK_MINUSMINUS) ? -1 : 1;
Lex();
switch(_es.etype)
{
case EXPR: Error(_SC("can't '++' or '--' an expression")); break;
case OBJECT:
case BASE:
Emit2ArgsOP(_OP_PINC, diff);
break;
case LOCAL: {
SQInteger src = _fs->PopTarget();
_fs->AddInstruction(_OP_PINCL, _fs->PushTarget(), src, 0, diff);
}
break;
case OUTER: {
SQInteger tmp1 = _fs->PushTarget();
SQInteger tmp2 = _fs->PushTarget();
_fs->AddInstruction(_OP_GETOUTER, tmp2, _es.epos);
_fs->AddInstruction(_OP_PINCL, tmp1, tmp2, 0, diff);
_fs->AddInstruction(_OP_SETOUTER, tmp2, _es.epos, tmp2);
_fs->PopTarget();
}
}
}
return;
break;
case _SC('('):
switch(_es.etype) {
case OBJECT: {
SQInteger key = _fs->PopTarget(); /* location of the key */
SQInteger table = _fs->PopTarget(); /* location of the object */
SQInteger closure = _fs->PushTarget(); /* location for the closure */
SQInteger ttarget = _fs->PushTarget(); /* location for 'this' pointer */
_fs->AddInstruction(_OP_PREPCALL, closure, key, table, ttarget);
}
break;
case BASE:
//Emit2ArgsOP(_OP_GET);
_fs->AddInstruction(_OP_MOVE, _fs->PushTarget(), 0);
break;
case OUTER:
_fs->AddInstruction(_OP_GETOUTER, _fs->PushTarget(), _es.epos);
_fs->AddInstruction(_OP_MOVE, _fs->PushTarget(), 0);
break;
default:
_fs->AddInstruction(_OP_MOVE, _fs->PushTarget(), 0);
}
_es.etype = EXPR;
Lex();
FunctionCallArgs();
break;
default: return;
}
}
}
SQInteger Factor()
{
_es.etype = EXPR;
switch(_token)
{
case TK_STRING_LITERAL:
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(_fs->CreateString(_lex._svalue,_lex._longstr.size()-1)));
Lex();
break;
case TK_BASE:
Lex();
_fs->AddInstruction(_OP_GETBASE, _fs->PushTarget());
_es.etype = BASE;
_es.epos = _fs->TopTarget();
return (_es.epos);
break;
case TK_IDENTIFIER:
case TK_CONSTRUCTOR:
case TK_THIS:{
SQObject id;
SQObject constant;
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) {
/* Handle a local variable (includes 'this') */
_fs->PushTarget(pos);
_es.etype = LOCAL;
_es.epos = pos;
}
else if((pos = _fs->GetOuterVariable(id)) != -1) {
/* Handle a free var */
if(NeedGet()) {
_es.epos = _fs->PushTarget();
_fs->AddInstruction(_OP_GETOUTER, _es.epos, pos);
/* _es.etype = EXPR; already default value */
}
else {
_es.etype = OUTER;
_es.epos = pos;
}
}
else if(_fs->IsConstant(id, constant)) {
/* Handle named constant */
SQObjectPtr constval;
SQObject constid;
if(type(constant) == OT_TABLE) {
Expect('.');
constid = Expect(TK_IDENTIFIER);
if(!_table(constant)->Get(constid, constval)) {
constval.Null();
Error(_SC("invalid constant [%s.%s]"), _stringval(id), _stringval(constid));
}
}
else {
constval = constant;
}
_es.epos = _fs->PushTarget();
/* generate direct or literal function depending on size */
SQObjectType ctype = type(constval);
switch(ctype) {
case OT_INTEGER: EmitLoadConstInt(_integer(constval),_es.epos); break;
case OT_FLOAT: EmitLoadConstFloat(_float(constval),_es.epos); break;
default: _fs->AddInstruction(_OP_LOAD,_es.epos,_fs->GetConstant(constval)); break;
}
_es.etype = EXPR;
}
else {
/* Handle a non-local variable, aka a field. Push the 'this' pointer on
* the virtual stack (always found in offset 0, so no instruction needs to
* be generated), and push the key next. Generate an _OP_LOAD instruction
* for the latter. If we are not using the variable as a dref expr, generate
* the _OP_GET instruction.
*/
_fs->PushTarget(0);
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(id));
if(NeedGet()) {
Emit2ArgsOP(_OP_GET);
}
_es.etype = OBJECT;
}
return _es.epos;
}
break;
case TK_DOUBLE_COLON: // "::"
_fs->AddInstruction(_OP_LOADROOT, _fs->PushTarget());
_es.etype = OBJECT;
_token = _SC('.'); /* hack: drop into PrefixExpr, case '.'*/
_es.epos = -1;
return _es.epos;
break;
case TK_NULL:
_fs->AddInstruction(_OP_LOADNULLS, _fs->PushTarget(),1);
Lex();
break;
case TK_INTEGER: EmitLoadConstInt(_lex._nvalue,-1); Lex(); break;
case TK_FLOAT: EmitLoadConstFloat(_lex._fvalue,-1); 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_NEWOBJ, _fs->PushTarget(),0,0,NOT_ARRAY);
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, AAT_STACK);
key++;
}
_fs->SetIntructionParam(apos, 1, key);
Lex();
}
break;
case _SC('{'):
_fs->AddInstruction(_OP_NEWOBJ, _fs->PushTarget(),0,NOT_TABLE);
Lex();ParseTableOrClass(_SC(','),_SC('}'));
break;
case TK_FUNCTION: FunctionExp(_token);break;
case _SC('@'): FunctionExp(_token,true);break;
case TK_CLASS: Lex(); ClassExp();break;
case _SC('-'):
Lex();
switch(_token) {
case TK_INTEGER: EmitLoadConstInt(-_lex._nvalue,-1); Lex(); break;
case TK_FLOAT: EmitLoadConstFloat(-_lex._fvalue,-1); Lex(); break;
default: UnaryOP(_OP_NEG);
}
break;
case _SC('!'): Lex(); UnaryOP(_OP_NOT); break;
case _SC('~'):
Lex();
if(_token == TK_INTEGER) { EmitLoadConstInt(~_lex._nvalue,-1); Lex(); break; }
UnaryOP(_OP_BWNOT);
break;
case TK_TYPEOF : Lex() ;UnaryOP(_OP_TYPEOF); break;
case TK_RESUME : Lex(); UnaryOP(_OP_RESUME); break;
case TK_CLONE : Lex(); UnaryOP(_OP_CLONE); break;
case TK_MINUSMINUS :
case TK_PLUSPLUS :PrefixIncDec(_token); break;
case TK_DELETE : DeleteExpr(); break;
case _SC('('): Lex(); CommaExpr(); Expect(_SC(')'));
break;
default: Error(_SC("expression expected"));
}
return -1;
}
void EmitLoadConstInt(SQInteger value,SQInteger target)
{
if(target < 0) {
target = _fs->PushTarget();
}
if((value & (~((SQInteger)0xFFFFFFFF))) == 0) { //does it fit in 32 bits?
_fs->AddInstruction(_OP_LOADINT, target,value);
}
else {
_fs->AddInstruction(_OP_LOAD, target, _fs->GetNumericConstant(value));
}
}
void EmitLoadConstFloat(SQFloat value,SQInteger target)
{
if(target < 0) {
target = _fs->PushTarget();
}
if(sizeof(SQFloat) == sizeof(SQInt32)) {
_fs->AddInstruction(_OP_LOADFLOAT, target,*((SQInt32 *)&value));
}
else {
_fs->AddInstruction(_OP_LOAD, target, _fs->GetNumericConstant(value));
}
}
void UnaryOP(SQOpcode op)
{
PrefixedExpr();
SQInteger src = _fs->PopTarget();
_fs->AddInstruction(op, _fs->PushTarget(), src);
}
bool NeedGet()
{
switch(_token) {
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 false;
}
return (!_es.donot_get || ( _es.donot_get && (_token == _SC('.') || _token == _SC('['))));
}
void FunctionCallArgs()
{
SQInteger nargs = 1;//this
while(_token != _SC(')')) {
Expression();
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_NEWOBJ, _fs->PushTarget(),0,NOT_TABLE); 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;
case TK_STRING_LITERAL: //JSON
if(separator == ',') { //only works for tables
_fs->AddInstruction(_OP_LOAD, _fs->PushTarget(), _fs->GetConstant(Expect(TK_STRING_LITERAL)));
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
if(separator == _SC(',')) { //hack recognizes a table from the separator
_fs->AddInstruction(_OP_NEWSLOT, 0xFF, table, key, val);
}
else {
_fs->AddInstruction(_OP_NEWSLOTA, flags, table, key, val); //this for classes only as it invokes _newmember
}
}
if(separator == _SC(',')) //hack recognizes a table from the separator
_fs->SetIntructionParam(tpos, 1, nkeys);
Lex();
}
void LocalDeclStatement()
{
SQObject varname;
Lex();
if( _token == TK_FUNCTION) {
Lex();
varname = Expect(TK_IDENTIFIER);
Expect(_SC('('));
CreateFunction(varname,false);
_fs->AddInstruction(_OP_CLOSURE, _fs->PushTarget(), _fs->_functions.size() - 1, 0);
_fs->PopTarget();
_fs->PushLocalVariable(varname);
return;
}
do {
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);
if(_token == _SC(',')) Lex(); else break;
} while(1);
}
void IfStatement()
{
SQInteger jmppos;
bool haselse = false;
Lex(); Expect(_SC('(')); CommaExpr(); Expect(_SC(')'));
_fs->AddInstruction(_OP_JZ, _fs->PopTarget());
SQInteger jnepos = _fs->GetCurrentPos();
BEGIN_SCOPE();
Statement();
//
if(_token != _SC('}') && _token != TK_ELSE) OptionalSemicolon();
END_SCOPE();
SQInteger endifblock = _fs->GetCurrentPos();
if(_token == TK_ELSE){
haselse = true;
BEGIN_SCOPE();
_fs->AddInstruction(_OP_JMP);
jmppos = _fs->GetCurrentPos();
Lex();
Statement(); OptionalSemicolon();
END_SCOPE();
_fs->SetIntructionParam(jmppos, 1, _fs->GetCurrentPos() - jmppos);
}
_fs->SetIntructionParam(jnepos, 1, endifblock - jnepos + (haselse?1:0));
}
void WhileStatement()
{
SQInteger jzpos, jmppos;
jmppos = _fs->GetCurrentPos();
Lex(); Expect(_SC('(')); CommaExpr(); Expect(_SC(')'));
BEGIN_BREAKBLE_BLOCK();
_fs->AddInstruction(_OP_JZ, _fs->PopTarget());
jzpos = _fs->GetCurrentPos();
BEGIN_SCOPE();
Statement();
END_SCOPE();
_fs->AddInstruction(_OP_JMP, 0, jmppos - _fs->GetCurrentPos() - 1);
_fs->SetIntructionParam(jzpos, 1, _fs->GetCurrentPos() - jzpos);
END_BREAKBLE_BLOCK(jmppos);
}
void DoWhileStatement()
{
Lex();
SQInteger jmptrg = _fs->GetCurrentPos();
BEGIN_BREAKBLE_BLOCK()
BEGIN_SCOPE();
Statement();
END_SCOPE();
Expect(TK_WHILE);
SQInteger continuetrg = _fs->GetCurrentPos();
Expect(_SC('(')); CommaExpr(); Expect(_SC(')'));
_fs->AddInstruction(_OP_JZ, _fs->PopTarget(), 1);
_fs->AddInstruction(_OP_JMP, 0, jmptrg - _fs->GetCurrentPos() - 1);
END_BREAKBLE_BLOCK(continuetrg);
}
void ForStatement()
{
Lex();
BEGIN_SCOPE();
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);
END_SCOPE();
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
BEGIN_SCOPE();
//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();
_fs->AddInstruction(_OP_POSTFOREACH, container, 0, indexpos);
//generate the statement code
BEGIN_BREAKBLE_BLOCK()
Statement();
_fs->AddInstruction(_OP_JMP, 0, jmppos - _fs->GetCurrentPos() - 1);
_fs->SetIntructionParam(foreachpos, 1, _fs->GetCurrentPos() - foreachpos);
_fs->SetIntructionParam(foreachpos + 1, 1, _fs->GetCurrentPos() - foreachpos);
END_BREAKBLE_BLOCK(foreachpos - 1);
//restore the local variable stack(remove index,val and ref idx)
END_SCOPE();
}
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) {
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();
BEGIN_SCOPE();
Statements();
END_SCOPE();
bfirst = false;
}
if(tonextcondjmp != -1)
_fs->SetIntructionParam(tonextcondjmp, 1, _fs->GetCurrentPos() - tonextcondjmp);
if(_token == TK_DEFAULT) {
Lex(); Expect(_SC(':'));
BEGIN_SCOPE();
Statements();
END_SCOPE();
}
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()
{
SQExpState es;
Lex();
es = _es;
_es.donot_get = true;
PrefixedExpr();
if(_es.etype == EXPR) {
Error(_SC("invalid class name"));
}
else if(_es.etype == OBJECT || _es.etype == BASE) {
ClassExp();
EmitDerefOp(_OP_NEWSLOT);
_fs->PopTarget();
}
else {
Error(_SC("cannot create a class in a local with the syntax(class <local>)"));
}
_es = es;
}
SQObject ExpectScalar()
{
SQObject val;
val._type = OT_NULL; val._unVal.nInteger = 0; //shut up GCC 4.x
switch(_token) {
case TK_INTEGER:
val._type = OT_INTEGER;
val._unVal.nInteger = _lex._nvalue;
break;
case TK_FLOAT:
val._type = OT_FLOAT;
val._unVal.fFloat = _lex._fvalue;
break;
case TK_STRING_LITERAL:
val = _fs->CreateString(_lex._svalue,_lex._longstr.size()-1);
break;
case '-':
Lex();
switch(_token)
{
case TK_INTEGER:
val._type = OT_INTEGER;
val._unVal.nInteger = -_lex._nvalue;
break;
case TK_FLOAT:
val._type = OT_FLOAT;
val._unVal.fFloat = -_lex._fvalue;
break;
default:
Error(_SC("scalar expected : integer,float"));
}
break;
default:
Error(_SC("scalar expected : integer,float or string"));
}
Lex();
return val;
}
void EnumStatement()
{
Lex();
SQObject id = Expect(TK_IDENTIFIER);
Expect(_SC('{'));
SQObject table = _fs->CreateTable();
SQInteger nval = 0;
while(_token != _SC('}')) {
SQObject key = Expect(TK_IDENTIFIER);
SQObject val;
if(_token == _SC('=')) {
Lex();
val = ExpectScalar();
}
else {
val._type = OT_INTEGER;
val._unVal.nInteger = nval++;
}
_table(table)->NewSlot(SQObjectPtr(key),SQObjectPtr(val));
if(_token == ',') Lex();
}
SQTable *enums = _table(_ss(_vm)->_consts);
SQObjectPtr strongid = id;
enums->NewSlot(SQObjectPtr(strongid),SQObjectPtr(table));
strongid.Null();
Lex();
}
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();
{
BEGIN_SCOPE();
Statement();
END_SCOPE();
}
_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(')'));
{
BEGIN_SCOPE();
SQInteger ex_target = _fs->PushLocalVariable(exid);
_fs->SetIntructionParam(trappos, 0, ex_target);
Statement();
_fs->SetIntructionParams(jmppos, 0, (_fs->GetCurrentPos() - jmppos), 0);
END_SCOPE();
}
}
void FunctionExp(SQInteger ftype,bool lambda = false)
{
Lex(); Expect(_SC('('));
SQObjectPtr dummy;
CreateFunction(dummy,lambda);
_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_NEWOBJ, _fs->PushTarget(),0,NOT_TABLE);
ParseTableOrClass(_SC(','),TK_ATTR_CLOSE);
attrs = _fs->TopTarget();
}
Expect(_SC('{'));
if(attrs != -1) _fs->PopTarget();
if(base != -1) _fs->PopTarget();
_fs->AddInstruction(_OP_NEWOBJ, _fs->PushTarget(), base, attrs,NOT_CLASS);
ParseTableOrClass(_SC(';'),_SC('}'));
}
void DeleteExpr()
{
SQExpState es;
Lex();
es = _es;
_es.donot_get = true;
PrefixedExpr();
if(_es.etype==EXPR) Error(_SC("can't delete an expression"));
if(_es.etype==OBJECT || _es.etype==BASE) {
Emit2ArgsOP(_OP_DELETE);
}
else {
Error(_SC("cannot delete an (outer) local"));
}
_es = es;
}
void PrefixIncDec(SQInteger token)
{
SQExpState es;
SQInteger diff = (token==TK_MINUSMINUS) ? -1 : 1;
Lex();
es = _es;
_es.donot_get = true;
PrefixedExpr();
if(_es.etype==EXPR) {
Error(_SC("can't '++' or '--' an expression"));
}
else if(_es.etype==OBJECT || _es.etype==BASE) {
Emit2ArgsOP(_OP_INC, diff);
}
else if(_es.etype==LOCAL) {
SQInteger src = _fs->TopTarget();
_fs->AddInstruction(_OP_INCL, src, src, 0, diff);
}
else if(_es.etype==OUTER) {
SQInteger tmp = _fs->PushTarget();
_fs->AddInstruction(_OP_GETOUTER, tmp, _es.epos);
_fs->AddInstruction(_OP_INCL, tmp, tmp, 0, diff);
_fs->AddInstruction(_OP_SETOUTER, tmp, _es.epos, tmp);
}
_es = es;
}
void CreateFunction(SQObject &name,bool lambda = false)
{
SQFuncState *funcstate = _fs->PushChildState(_ss(_vm));
funcstate->_name = name;
SQObject paramname;
funcstate->AddParameter(_fs->CreateString(_SC("this")));
funcstate->_sourcename = _sourcename;
SQInteger defparams = 0;
while(_token!=_SC(')')) {
if(_token == TK_VARPARAMS) {
if(defparams > 0) Error(_SC("function with default parameters cannot have variable number of parameters"));
funcstate->AddParameter(_fs->CreateString(_SC("vargv")));
funcstate->_varparams = true;
Lex();
if(_token != _SC(')')) Error(_SC("expected ')'"));
break;
}
else {
paramname = Expect(TK_IDENTIFIER);
funcstate->AddParameter(paramname);
if(_token == _SC('=')) {
Lex();
Expression();
funcstate->AddDefaultParam(_fs->TopTarget());
defparams++;
}
else {
if(defparams > 0) Error(_SC("expected '='"));
}
if(_token == _SC(',')) Lex();
else if(_token != _SC(')')) Error(_SC("expected ')' or ','"));
}
}
Expect(_SC(')'));
for(SQInteger n = 0; n < defparams; n++) {
_fs->PopTarget();
}
SQFuncState *currchunk = _fs;
_fs = funcstate;
if(lambda) {
Expression();
_fs->AddInstruction(_OP_RETURN, 1, _fs->PopTarget());}
else {
Statement(false);
}
funcstate->AddLineInfos(_lex._prevtoken == _SC('\n')?_lex._lasttokenline:_lex._currentline, _lineinfo, true);
funcstate->AddInstruction(_OP_RETURN, -1);
funcstate->SetStackSize(0);
SQFunctionProto *func = funcstate->BuildProto();
#ifdef _DEBUG_DUMP
funcstate->Dump(func);
#endif
_fs = currchunk;
_fs->_functions.push_back(func);
_fs->PopChildState();
}
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;
SQExpState _es;
SQScope _scope;
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);
}
#endif
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