public void atStmnt(Stmnt st) throws CompileError {
if (st == null) return; // empty
int op = st.getOperator();
if (op == EXPR) {
ASTree expr = st.getLeft();
doTypeCheck(expr);
if (expr instanceof AssignExpr) atAssignExpr((AssignExpr) expr, false);
else if (isPlusPlusExpr(expr)) {
Expr e = (Expr) expr;
atPlusPlus(e.getOperator(), e.oprand1(), e, false);
} else {
expr.accept(this);
if (is2word(exprType, arrayDim)) bytecode.addOpcode(POP2);
else if (exprType != VOID) bytecode.addOpcode(POP);
}
} else if (op == DECL || op == BLOCK) {
ASTList list = st;
while (list != null) {
ASTree h = list.head();
list = list.tail();
if (h != null) h.accept(this);
}
} else if (op == IF) atIfStmnt(st);
else if (op == WHILE || op == DO) atWhileStmnt(st, op == WHILE);
else if (op == FOR) atForStmnt(st);
else if (op == BREAK || op == CONTINUE) atBreakStmnt(st, op == BREAK);
else if (op == TokenId.RETURN) atReturnStmnt(st);
else if (op == THROW) atThrowStmnt(st);
else if (op == TRY) atTryStmnt(st);
else if (op == SWITCH) atSwitchStmnt(st);
else if (op == SYNCHRONIZED) atSyncStmnt(st);
else {
// LABEL, SWITCH label stament might be null?.
hasReturned = false;
throw new CompileError("sorry, not supported statement: TokenId " + op);
}
}
public void atAssignExpr(AssignExpr expr) throws CompileError {
atAssignExpr(expr, true);
}