Naked functions can't access to their parameters

[Dadoum]

import ldc.attributes;
import ldc.llvmasm;

void test(void* del) @naked {
	__asm("jmp *$0", "{rax}", del);
}

This causes LDC to output a stacktrace without writing any readable error.

[kinke]

The prologue is skipped for naked functions, so params can only be accessed via underlying register/stack slot. E.g., for Posix x86_64:

void test(void* del) @naked {
    asm { "jmp *%%rdi"; }
}

[dnadlinger]

I was curious seeing this scroll by – it only fails in SelectionDAG when optimisations are enabled; at -O0, LLVM seems happy enough to emit machine code for this. Please include the exact output and compiler version/flags when filing issues!

Seems like we should disallow parameter access in @naked functions in the frontend layer.