1/* Usage example for libgccjit.so 2 Copyright (C) 2014-2015 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify it 7under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 3, or (at your option) 9any later version. 10 11GCC is distributed in the hope that it will be useful, but 12WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14General Public License for more details. 15 16You should have received a copy of the GNU General Public License 17along 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 25void 26create_code (gcc_jit_context *ctxt) 27{ 28 /* Let's try to inject the equivalent of: 29 30 int square (int i) 31 { 32 return i * i; 33 } 34 */ 35 gcc_jit_type *int_type = 36 gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT); 37 gcc_jit_param *param_i = 38 gcc_jit_context_new_param (ctxt, NULL, int_type, "i"); 39 gcc_jit_function *func = 40 gcc_jit_context_new_function (ctxt, NULL, 41 GCC_JIT_FUNCTION_EXPORTED, 42 int_type, 43 "square", 44 1, ¶m_i, 45 0); 46 47 gcc_jit_block *block = gcc_jit_function_new_block (func, NULL); 48 49 gcc_jit_rvalue *expr = 50 gcc_jit_context_new_binary_op ( 51 ctxt, NULL, 52 GCC_JIT_BINARY_OP_MULT, int_type, 53 gcc_jit_param_as_rvalue (param_i), 54 gcc_jit_param_as_rvalue (param_i)); 55 56 gcc_jit_block_end_with_return (block, NULL, expr); 57} 58 59int 60main (int argc, char **argv) 61{ 62 gcc_jit_context *ctxt = NULL; 63 gcc_jit_result *result = NULL; 64 65 /* Get a "context" object for working with the library. */ 66 ctxt = gcc_jit_context_acquire (); 67 if (!ctxt) 68 { 69 fprintf (stderr, "NULL ctxt"); 70 goto error; 71 } 72 73 /* Set some options on the context. 74 Let's see the code being generated, in assembler form. */ 75 gcc_jit_context_set_bool_option ( 76 ctxt, 77 GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, 78 0); 79 80 /* Populate the context. */ 81 create_code (ctxt); 82 83 /* Compile the code. */ 84 result = gcc_jit_context_compile (ctxt); 85 if (!result) 86 { 87 fprintf (stderr, "NULL result"); 88 goto error; 89 } 90 91 /* We're done with the context; we can release it: */ 92 gcc_jit_context_release (ctxt); 93 ctxt = NULL; 94 95 /* Extract the generated code from "result". */ 96 void *fn_ptr = gcc_jit_result_get_code (result, "square"); 97 if (!fn_ptr) 98 { 99 fprintf (stderr, "NULL fn_ptr"); 100 goto error; 101 } 102 103 typedef int (*fn_type) (int); 104 fn_type square = (fn_type)fn_ptr; 105 printf ("result: %d\n", square (5)); 106 107 error: 108 if (ctxt) 109 gcc_jit_context_release (ctxt); 110 if (result) 111 gcc_jit_result_release (result); 112 return 0; 113} 114