private void CodeWhile(WhileStatement whileStatement, List<LocalVariable> locals, List<GlobalVariable> globals, FuncParam[] parameters, ILGenerator il,
Stack<Label> breaks, List<Function> allFuncs, LocalBuilder tmpVar)
{
var endLabel = il.DefineLabel();
var startLabel = il.DefineLabel();
breaks.Push(endLabel);
il.MarkLabel(startLabel);
CodeExpression(whileStatement.Condition, locals, globals, parameters, il, allFuncs, tmpVar);
il.Emit(OpCodes.Brfalse_S, endLabel);
CodeStatement(whileStatement.Statement, locals, globals, parameters, il, breaks, allFuncs, tmpVar);
il.Emit(OpCodes.Br_S, startLabel);
il.MarkLabel(breaks.Pop());
}
private Statement Smth()
{
Statement st = null;
if (_la == Terminals.Id || _la == Terminals.Num || _la == Terminals.LPar || _la == Terminals.Minus ||
_la == Terminals.Inv)
{
st = Expr();
Expect(Terminals.Semicolon);
}
else if (_la == Terminals.Return)
{
Get();
var r = Expr();
Expect(Terminals.Semicolon);
st = new ReturnStatement(r);
}
else if (_la == Terminals.Read)
{
Get();
var v = Expect(Terminals.Id) as Id;
Expect(Terminals.Semicolon);
st = new ReadStatement(v);
}
else if (_la == Terminals.Write)
{
Get();
var r = Expr();
Expect(Terminals.Semicolon);
st = new WriteStatement(r);
}
else if (_la == Terminals.Writeln)
{
Get();
Expect(Terminals.Semicolon);
st = new WritelnStatement();
}
else if (_la == Terminals.Break)
{
Get();
Expect(Terminals.Semicolon);
st = new BreakStatement();
}
else if (_la == Terminals.If)
{
Get();
Expect(Terminals.LPar);
var c = Expr();
Expect(Terminals.RPar);
var t = Smth();
Expect(Terminals.Else);
var f = Smth();
st = new IfStatement(c, t, f);
}
else if (_la == Terminals.While)
{
Get();
Expect(Terminals.LPar);
var c = Expr();
Expect(Terminals.RPar);
var s = Smth();
st = new WhileStatement(c, s);
}
else if (_la == Terminals.Start)
{
st = Block();
}
else
SynErr(37);
return st;
}