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1 /* Smoketest example for libgccjit.so C++ API
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2 Copyright (C) 2014-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GCC is distributed in the hope that it will be useful, but
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12 WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include <libgccjit++.h>
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21
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22 #include <stdlib.h>
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23 #include <stdio.h>
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24
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25 static void
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26 create_code (gccjit::context ctxt)
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27 {
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28 /* Let's try to inject the equivalent of this C code:
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29 void
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30 greet (const char *name)
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31 {
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32 printf ("hello %s\n", name);
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33 }
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34 */
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35 gccjit::type void_type = ctxt.get_type (GCC_JIT_TYPE_VOID);
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36 gccjit::type const_char_ptr_type =
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37 ctxt.get_type (GCC_JIT_TYPE_CONST_CHAR_PTR);
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38 gccjit::param param_name =
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39 ctxt.new_param (const_char_ptr_type, "name");
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40 std::vector<gccjit::param> func_params;
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41 func_params.push_back (param_name);
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42 gccjit::function func =
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43 ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED,
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44 void_type,
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45 "greet",
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46 func_params, 0);
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47
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48 gccjit::param param_format =
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49 ctxt.new_param (const_char_ptr_type, "format");
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50 std::vector<gccjit::param> printf_params;
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51 printf_params.push_back (param_format);
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52 gccjit::function printf_func =
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53 ctxt.new_function (GCC_JIT_FUNCTION_IMPORTED,
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54 ctxt.get_type (GCC_JIT_TYPE_INT),
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55 "printf",
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56 printf_params, 1);
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57
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58 gccjit::block block = func.new_block ();
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59 block.add_eval (ctxt.new_call (printf_func,
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60 ctxt.new_rvalue ("hello %s\n"),
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61 param_name));
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62 block.end_with_return ();
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63 }
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64
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65 int
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66 main (int argc, char **argv)
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67 {
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68 gccjit::context ctxt;
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69 gcc_jit_result *result;
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70
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71 /* Get a "context" object for working with the library. */
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72 ctxt = gccjit::context::acquire ();
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73
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74 /* Set some options on the context.
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75 Turn this on to see the code being generated, in assembler form. */
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76 ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, 0);
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77
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78 /* Populate the context. */
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79 create_code (ctxt);
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80
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81 /* Compile the code. */
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82 result = ctxt.compile ();
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83 if (!result)
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84 {
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85 fprintf (stderr, "NULL result");
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86 exit (1);
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87 }
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88
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89 ctxt.release ();
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90
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91 /* Extract the generated code from "result". */
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92 typedef void (*fn_type) (const char *);
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93 fn_type greet =
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94 (fn_type)gcc_jit_result_get_code (result, "greet");
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95 if (!greet)
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96 {
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97 fprintf (stderr, "NULL greet");
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98 exit (1);
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99 }
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100
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101 /* Now call the generated function: */
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102 greet ("world");
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103 fflush (stdout);
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104
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105 gcc_jit_result_release (result);
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106 return 0;
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107 }
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