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asutherland
Joined: 16 Dec 2013
Posts: 4
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 Posted: Wed Sep 24, 2014 6:49 pm Post subject: BSC 2014.05.C Generated VPI wrapper crashes iverilog sim |
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I have a BDPI function:
import "BDPI" function ActionValue#(Bit#(32)) read_pixel();
The generated vpi_wrapper causes iverilog simulator to crash trying to free a null pointer. This can be corrected by commenting out 3 lines of unused code. (see version below)
| Code: | /* VPI wrapper function */
PLI_INT32 read_pixel_calltf(PLI_BYTE8 *user_data)
{
vpiHandle hCall;
unsigned int vpi_result;
vpiHandle *handle_array;
/* retrieve handle array */
hCall = vpi_handle(vpiSysTfCall, 0);
handle_array = vpi_get_userdata(hCall);
if (handle_array == NULL)
{
vpiHandle hArgList;
hArgList = vpi_iterate(vpiArgument, hCall);
handle_array = malloc(sizeof(vpiHandle) * 1u);
handle_array[0u] = hCall;
vpi_put_userdata(hCall, handle_array);
vpi_free_object(hArgList); <----------------------------------------------------------------------------
}
/* create return value */
make_vpi_result(handle_array[0u], &vpi_result, DIRECT);
/* call the imported C function */
vpi_result = read_pixel();
/* copy out return value */
put_vpi_result(handle_array[0u], &vpi_result, DIRECT);
vpi_free_object(hCall);
return 0;
}
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Comment out unused hArgList to correct.
| Code: | ...
if (handle_array == NULL)
{
// vpiHandle hArgList;
// hArgList = vpi_iterate(vpiArgument, hCall);
handle_array = malloc(sizeof(vpiHandle) * 1u);
handle_array[0u] = hCall;
vpi_put_userdata(hCall, handle_array);
// vpi_free_object(hArgList);
}
... |
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quark
Site Admin
Joined: 02 Nov 2007
Posts: 496
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| Posted: Thu Sep 25, 2014 2:10 pm Post subject: Re: BSC 2014.05.C Generated VPI wrapper crashes iverilog sim |
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I am able to reproduce this problem, with iverilog 0.9.7. I get this error:
| Code: | vvp: vpi_priv.cc:138: PLI_INT32 vpi_free_object(__vpiHandle*): Assertion `ref' failed.
Abort
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The example works when using a commercial simulator, though. So it may be a bug in iverilog. I'll have a look. Thank you for reporting this issue. |
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asutherland
Joined: 16 Dec 2013
Posts: 4
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| Posted: Mon Sep 29, 2014 3:24 pm Post subject: |
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Just realized that adding a dummy param is a work around for this.
Obvious, but it took me a while to get there. |
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