Hello,
I have a problem with the compiler.
I write quite extensive code and I encountered a problem with "optimization". If I use -O2 optimization, the problem occurs, if I don't use optimization, the problem is gone.
Maybe you will advise how to find out where the problem is?
A few tips I have noticed:
- There is a problem with the procedural procedure
- if I don't use the last third variable, it works fine
- if I use this variable, the data changed in this procedure do not affect the outside.
Now some code:
1. In file project_eth.lpr in the loop calling SocketProcess(data_buf) from ethernet.pas.
2. In SocketProcess calling ETH_Process from 117 line
3. ETH_Process calling ETH_Process_Frame from 99 line
4. ETH_Process_Frame calling ETH_Protocol_IP from ETH_Process_Frame (55 line)
5. ETH_Protocol_IP_TCP calling socket^.recv_func from line 341
socket^.recv_func it contains the address server_recv80 procedure
the procedure is performed but has no effect on external variables.
if use variable "rcv_size" in server_recv80 procedure, that server_recv80 not change data with the help of SocketSendData(tcb_id, @snd_buff[0], size); <<< ---- write the addres snd_buff and write size to TCB
SocketClose(tcb_id); <<< ---- Set flag = FLAG_FIN in TCB
I test this with code after calling this procedure in ethernet_ip_tcp.pas line 342
I no use optimization in FPC, all calling OK and code from 342 line is true.
my question is what makes the same code after -O2 optimization not work.
Or why if I use the -O2 optimization and comment the code from line 84-95, it also works correctly.
how to find it?
In lib directory asm in non -O2 version, and -O2 version
Link to sources :
https://github.com/devport/LPC1114Sorry for the english, written with the help of google translator
Recent
