]>
Commit | Line | Data |
---|---|---|
29df5715 | 1 | /* Usage example for libgccjit.so's C++ API |
a945c346 | 2 | Copyright (C) 2014-2024 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 | /* | |
29 | Simple sum-of-squares, to test conditionals and looping | |
30 | ||
31 | int loop_test (int n) | |
32 | { | |
33 | int i; | |
34 | int sum = 0; | |
35 | for (i = 0; i < n ; i ++) | |
36 | { | |
37 | sum += i * i; | |
38 | } | |
39 | return sum; | |
40 | */ | |
41 | gccjit::type the_type = ctxt.get_int_type <int> (); | |
42 | gccjit::type return_type = the_type; | |
43 | ||
44 | gccjit::param n = ctxt.new_param (the_type, "n"); | |
45 | std::vector<gccjit::param> params; | |
46 | params.push_back (n); | |
47 | gccjit::function func = | |
48 | ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED, | |
49 | return_type, | |
50 | "loop_test", | |
51 | params, 0); | |
52 | ||
53 | /* Build locals: */ | |
54 | gccjit::lvalue i = func.new_local (the_type, "i"); | |
55 | gccjit::lvalue sum = func.new_local (the_type, "sum"); | |
56 | ||
57 | gccjit::block b_initial = func.new_block ("initial"); | |
58 | gccjit::block b_loop_cond = func.new_block ("loop_cond"); | |
59 | gccjit::block b_loop_body = func.new_block ("loop_body"); | |
60 | gccjit::block b_after_loop = func.new_block ("after_loop"); | |
61 | ||
62 | /* sum = 0; */ | |
63 | b_initial.add_assignment (sum, ctxt.zero (the_type)); | |
64 | ||
65 | /* i = 0; */ | |
66 | b_initial.add_assignment (i, ctxt.zero (the_type)); | |
67 | ||
68 | b_initial.end_with_jump (b_loop_cond); | |
69 | ||
70 | /* if (i >= n) */ | |
71 | b_loop_cond.end_with_conditional ( | |
72 | i >= n, | |
73 | b_after_loop, | |
74 | b_loop_body); | |
75 | ||
76 | /* sum += i * i */ | |
77 | b_loop_body.add_assignment_op (sum, | |
78 | GCC_JIT_BINARY_OP_PLUS, | |
79 | i * i); | |
80 | ||
81 | /* i++ */ | |
82 | b_loop_body.add_assignment_op (i, | |
83 | GCC_JIT_BINARY_OP_PLUS, | |
84 | ctxt.one (the_type)); | |
85 | ||
86 | b_loop_body.end_with_jump (b_loop_cond); | |
87 | ||
88 | /* return sum */ | |
89 | b_after_loop.end_with_return (sum); | |
90 | } | |
91 | ||
92 | int | |
93 | main (int argc, char **argv) | |
94 | { | |
95 | gccjit::context ctxt; | |
96 | gcc_jit_result *result = NULL; | |
97 | ||
98 | /* Get a "context" object for working with the library. */ | |
99 | ctxt = gccjit::context::acquire (); | |
100 | ||
101 | /* Set some options on the context. | |
102 | Turn this on to see the code being generated, in assembler form. */ | |
103 | ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, | |
104 | 0); | |
105 | ||
106 | /* Populate the context. */ | |
107 | create_code (ctxt); | |
108 | ||
109 | /* Compile the code. */ | |
110 | result = ctxt.compile (); | |
111 | ||
112 | ctxt.release (); | |
113 | ||
114 | if (!result) | |
115 | { | |
116 | fprintf (stderr, "NULL result"); | |
117 | return 1; | |
118 | } | |
119 | ||
120 | /* Extract the generated code from "result". */ | |
121 | typedef int (*loop_test_fn_type) (int); | |
122 | loop_test_fn_type loop_test = | |
123 | (loop_test_fn_type)gcc_jit_result_get_code (result, "loop_test"); | |
124 | if (!loop_test) | |
125 | { | |
126 | fprintf (stderr, "NULL loop_test"); | |
127 | gcc_jit_result_release (result); | |
128 | return 1; | |
129 | } | |
130 | ||
131 | /* Run the generated code. */ | |
132 | int val = loop_test (10); | |
133 | printf("loop_test returned: %d\n", val); | |
134 | ||
135 | gcc_jit_result_release (result); | |
136 | return 0; | |
137 | } |