private void atStringPlusEq(Expr expr, int type, int dim, String cname, ASTree right) throws CompileError { if (!jvmJavaLangString.equals(cname)) badAssign(expr); convToString(type, dim); // the value might be null. right.accept(this); convToString(exprType, arrayDim); bytecode.addInvokevirtual(javaLangString, "concat", "(Ljava/lang/String;)Ljava/lang/String;"); exprType = CLASS; arrayDim = 0; className = jvmJavaLangString; }
protected void atAssignCore(Expr expr, int op, ASTree right, int type, int dim, String cname) throws CompileError { if (op == PLUS_E && dim == 0 && type == CLASS) atStringPlusEq(expr, type, dim, cname, right); else { right.accept(this); if (invalidDim(exprType, arrayDim, className, type, dim, cname, false) || (op != '=' && dim > 0)) badAssign(expr); if (op != '=') { int token = assignOps[op - MOD_E]; int k = lookupBinOp(token); if (k < 0) fatal(); atArithBinExpr(expr, token, k, type); } } if (op != '=' || (dim == 0 && !isRefType(type))) atNumCastExpr(exprType, type); // type check should be done here. }