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/* Usage example for libgccjit.so's C++ API
Copyright (C) 2014-2020 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include <libgccjit++.h>
#include <stdlib.h>
#include <stdio.h>
void
create_code (gccjit::context ctxt)
{
/* Let's try to inject the equivalent of this C code:
int square (int i)
{
return i * i;
}
*/
gccjit::type int_type = ctxt.get_type (GCC_JIT_TYPE_INT);
gccjit::param param_i = ctxt.new_param (int_type, "i");
std::vector<gccjit::param> params;
params.push_back (param_i);
gccjit::function func = ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED,
int_type,
"square",
params, 0);
gccjit::block block = func.new_block ();
gccjit::rvalue expr =
ctxt.new_binary_op (GCC_JIT_BINARY_OP_MULT, int_type,
param_i, param_i);
block.end_with_return (expr);
}
int
main (int argc, char **argv)
{
/* Get a "context" object for working with the library. */
gccjit::context ctxt = gccjit::context::acquire ();
/* Set some options on the context.
Turn this on to see the code being generated, in assembler form. */
ctxt.set_bool_option (
GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE,
0);
/* Populate the context. */
create_code (ctxt);
/* Compile the code. */
gcc_jit_result *result = ctxt.compile ();
/* We're done with the context; we can release it: */
ctxt.release ();
if (!result)
{
fprintf (stderr, "NULL result");
return 1;
}
/* Extract the generated code from "result". */
void *fn_ptr = gcc_jit_result_get_code (result, "square");
if (!fn_ptr)
{
fprintf (stderr, "NULL fn_ptr");
gcc_jit_result_release (result);
return 1;
}
typedef int (*fn_type) (int);
fn_type square = (fn_type)fn_ptr;
printf ("result: %d\n", square (5));
gcc_jit_result_release (result);
return 0;
}
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