程式語言 - GNU - NanoJIT - Hello, world!

參考資訊：
https://github.com/dibyendumajumdar/nanojit

main.cpp

#include <stdio.h>
#include <nanojitextra.h>

static void myfun(void)
{
    printf("Hello, world!\n");
}

int main(int argc, char *argv[])
{
    int (*pfn)(void);
    NJXContextRef jit = NJX_create_context(true);
    NJX_register_C_function(jit, "myfun", reinterpret_cast<void *>(myfun), NJXValueKind_V, nullptr, 0);
    NJXFunctionBuilderRef builder = NJX_create_function_builder(jit, "test", NJXValueKind_I, nullptr, 0, true);
    NJX_callv(builder, "myfun", NJXCallAbiKind::NJX_CALLABI_CDECL, 0, nullptr);
    auto zero = NJX_immi(builder, 0);
    auto ret = NJX_reti(builder, zero);
    pfn = (int (*)(void))NJX_finalize(builder);
    NJX_destroy_function_builder(builder);

    pfn();

    NJX_destroy_context(jit);
    return 0;
}

編譯、執行

$ export LD_LIBRARY_PATH=/usr/local/lib
$ g++ main.cpp -o test -I/usr/local/include/nanojit /usr/local/lib/libnanojitextra.so -ggdb
$ ./test
    Hello, world!

$ gdb ./test

(gdb) b main.cpp:21
(gdb) r
(gdb) x/20i f
    0x7ffff7f7bfa4:	push   %rbp
    0x7ffff7f7bfa5:	mov    %rsp,%rbp
    0x7ffff7f7bfa8:	sub    $0x30,%rsp
    0x7ffff7f7bfac:	mov    %rbx,-0x28(%rbp)
    0x7ffff7f7bfb0:	mov    %r12,-0x20(%rbp)
    0x7ffff7f7bfb4:	mov    %r13,-0x18(%rbp)
    0x7ffff7f7bfb8:	mov    %r14,-0x10(%rbp)
    0x7ffff7f7bfbc:	mov    %r15,-0x8(%rbp)
    0x7ffff7f7bfc0:	movabs $0x555555555269,%rax
    0x7ffff7f7bfca:	call   *%rax
    0x7ffff7f7bfcc:	xor    %eax,%eax
    0x7ffff7f7bfce:	mov    %rbp,%rsp
    0x7ffff7f7bfd1:	pop    %rbp
    0x7ffff7f7bfd2:	ret