[llvm-dev] mcjit C interface problems

[Andres Freund via llvm-dev]

Hi,

On 2017-01-25 18:16:09 -0800, Toshiyasu Morita wrote:
> Thanks for the tip - getting closer:
> 
> $ ./capi_test 5 6
> args[0]: 5
> args[1]: 6
> result: 4294959200
> 
> Here's the code I changed:
> 
>   printf("args[0]: %d\n", (int)LLVMGenericValueToInt(args[0], 0));
>   printf("args[1]: %d\n", (int)LLVMGenericValueToInt(args[1], 0));
> 
>   uint64_t (*func)();
>   func = (uint64_t (*)())LLVMGetFunctionAddress(engine, "sum");
>   printf("result: %lu\n", (*func)());

You're calling the function without arguments, but it's (in IR) declared
to take two. And you're miscasting the return value to be int64, instead
of int32 as the function's declared.

Andres