<< 14-06-2025 >>
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11:47:07FromDiscord<madonuko> nim scripts are kinda brokey
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11:47:56fabriciowhat's up with concurrency libs going for the async/await route instead of golang style csp or perhaps even erlang style actors?
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13:39:28Guest32Hey hey, noobish question here about C interop.
13:39:29Guest32I'm using libgccjit from Nim, with simple importc bindings. Nim's been great so far!
13:39:29Guest32All is well until I actually try and call my generated code.
13:39:30Guest32libgccjit has a function called `gcc_jit_result_get_code`:
13:39:30Guest32```
13:39:31Guest32   This will need to be cast to a function pointer of the
13:39:32Guest32   correct type before it can be called. */
13:39:32Guest32extern void *
13:39:33Guest32gcc_jit_result_get_code (gcc_jit_result *result,
13:39:33Guest32             const char *funcname);
13:39:34Guest32```
13:39:34Guest32I seem to get a reasonable looking pointer back. How do I cast this to something I can pass arguments to from Nim? (If calling conventions are annoying, I'd be happy to settle for not being able to pass arguments.)
13:41:25Guest32I've tried every variety of cast I can to invoke this function pointer, and sadly the docs didn't have much to say about this case (dynamically generated code -- just calling a function pointer created at runtime)
13:51:33Guest32(for future readers who also just need 'a hacky thing to make this work')
13:51:34Guest32I made an `invoke_trampoline.c` file that just does this job on Nim's behalf:
13:51:34Guest32```
13:51:35Guest32void invoke_trampoline(void* fp, int argc, char** argv) {
13:51:35Guest32    int (*fp2)(int, char**) = fp;
13:51:36Guest32    fp2(argc, argv);
13:51:36Guest32}
13:51:37Guest32```
13:51:37Guest32And then simply pull this in from Nim usage code:
13:51:38Guest32```
13:51:38Guest32{.compile: "invoke_trampoline.c".}
13:51:39Guest32proc invokeTrampoline(fp: pointer, argc: cint, argv: ptr ptr char): void {.cdecl, importc: "invoke_trampoline".}
13:51:39Guest32```
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21:19:57FromDiscord<godalming123> sent a code paste, see https://play.nim-lang.org/#pasty=fZLDqCLx
21:30:15FromDiscord<Elegantbeef> `discard`
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