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29df5715 | 1 | /* Usage example for libgccjit.so's C++ API |
818ab71a | 2 | Copyright (C) 2014-2016 Free Software Foundation, Inc. |
29df5715 DM |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <libgccjit++.h> | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <stdio.h> | |
24 | ||
25 | void | |
26 | create_code (gccjit::context ctxt) | |
27 | { | |
28 | /* Let's try to inject the equivalent of this C code: | |
29 | ||
30 | int square (int i) | |
31 | { | |
32 | return i * i; | |
33 | } | |
34 | */ | |
35 | gccjit::type int_type = ctxt.get_type (GCC_JIT_TYPE_INT); | |
36 | gccjit::param param_i = ctxt.new_param (int_type, "i"); | |
37 | std::vector<gccjit::param> params; | |
38 | params.push_back (param_i); | |
39 | gccjit::function func = ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED, | |
40 | int_type, | |
41 | "square", | |
42 | params, 0); | |
43 | ||
44 | gccjit::block block = func.new_block (); | |
45 | ||
46 | gccjit::rvalue expr = | |
47 | ctxt.new_binary_op (GCC_JIT_BINARY_OP_MULT, int_type, | |
48 | param_i, param_i); | |
49 | ||
50 | block.end_with_return (expr); | |
51 | } | |
52 | ||
53 | int | |
54 | main (int argc, char **argv) | |
55 | { | |
56 | /* Get a "context" object for working with the library. */ | |
57 | gccjit::context ctxt = gccjit::context::acquire (); | |
58 | ||
59 | /* Set some options on the context. | |
60 | Turn this on to see the code being generated, in assembler form. */ | |
61 | ctxt.set_bool_option ( | |
62 | GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, | |
63 | 0); | |
64 | ||
65 | /* Populate the context. */ | |
66 | create_code (ctxt); | |
67 | ||
68 | /* Compile the code. */ | |
69 | gcc_jit_result *result = ctxt.compile (); | |
70 | ||
71 | /* We're done with the context; we can release it: */ | |
72 | ctxt.release (); | |
73 | ||
74 | if (!result) | |
75 | { | |
76 | fprintf (stderr, "NULL result"); | |
77 | return 1; | |
78 | } | |
79 | ||
80 | /* Extract the generated code from "result". */ | |
81 | void *fn_ptr = gcc_jit_result_get_code (result, "square"); | |
82 | if (!fn_ptr) | |
83 | { | |
84 | fprintf (stderr, "NULL fn_ptr"); | |
85 | gcc_jit_result_release (result); | |
86 | return 1; | |
87 | } | |
88 | ||
89 | typedef int (*fn_type) (int); | |
90 | fn_type square = (fn_type)fn_ptr; | |
91 | printf ("result: %d\n", square (5)); | |
92 | ||
93 | gcc_jit_result_release (result); | |
94 | return 0; | |
95 | } |