1 /*
2 * DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
3 * Version 2, December 2004
4 *
5 * Copyright (C) 2018 Olaf Wintermann <olaf.wintermann@gmail.com>
6 *
7 * Everyone is permitted to copy and distribute verbatim or modified
8 * copies of this license document, and changing it is allowed as long
9 * as the name is changed.
10 *
11 * DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
12 * TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
13 *
14 * 0. You just DO WHAT THE FUCK YOU WANT TO.
15 */
16
17 // GraalVM example: mixing Java and native Code (LLVM bitcode)
18
19 import org.graalvm.polyglot.*;
20 import java.io.*;
21
22 /*
23 * create a file test.c with the following content and compile it with:
24 * clang -c -O1 -emit-llvm test.c
25
26 #include <stdio.h>
27
28 int main(void) {
29 printf("Hello World!\n");
30 return 0;
31 }
32
33 int add(int a, int b) {
34 return a+b;
35 }
36
37 */
38
39 public class HelloPolyglot {
40 public static void main(String[] args) {
41 try {
42 // create a polyglot context that can access the native interface
43 Context ctx = Context.newBuilder().allowAllAccess(true).build();
44
45 // load an llvm bitcode file
46 File file = new File("test.bc");
47 Source source = Source.newBuilder("llvm", file).build();
48 Value c = ctx.eval(source);
49
50 // get the main function and execute it
51 c.getMember("main").execute();
52
53 // get add function
54 Value add = c.getMember("add");
55 Value ret = add.execute(10, 20);
56 System.out.println(ret.asInt());
57 } catch (IOException e) {
58 System.err.println(e);
59 }
60 }
61 }
62