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/* Usage example for libgccjit.so's C++ API
Copyright (C) 2014-2022 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)
{
/*
Simple sum-of-squares, to test conditionals and looping
int loop_test (int n)
{
int i;
int sum = 0;
for (i = 0; i < n ; i ++)
{
sum += i * i;
}
return sum;
*/
gccjit::type the_type = ctxt.get_int_type <int> ();
gccjit::type return_type = the_type;
gccjit::param n = ctxt.new_param (the_type, "n");
std::vector<gccjit::param> params;
params.push_back (n);
gccjit::function func =
ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED,
return_type,
"loop_test",
params, 0);
/* Build locals: */
gccjit::lvalue i = func.new_local (the_type, "i");
gccjit::lvalue sum = func.new_local (the_type, "sum");
gccjit::block b_initial = func.new_block ("initial");
gccjit::block b_loop_cond = func.new_block ("loop_cond");
gccjit::block b_loop_body = func.new_block ("loop_body");
gccjit::block b_after_loop = func.new_block ("after_loop");
/* sum = 0; */
b_initial.add_assignment (sum, ctxt.zero (the_type));
/* i = 0; */
b_initial.add_assignment (i, ctxt.zero (the_type));
b_initial.end_with_jump (b_loop_cond);
/* if (i >= n) */
b_loop_cond.end_with_conditional (
i >= n,
b_after_loop,
b_loop_body);
/* sum += i * i */
b_loop_body.add_assignment_op (sum,
GCC_JIT_BINARY_OP_PLUS,
i * i);
/* i++ */
b_loop_body.add_assignment_op (i,
GCC_JIT_BINARY_OP_PLUS,
ctxt.one (the_type));
b_loop_body.end_with_jump (b_loop_cond);
/* return sum */
b_after_loop.end_with_return (sum);
}
int
main (int argc, char **argv)
{
gccjit::context ctxt;
gcc_jit_result *result = NULL;
/* Get a "context" object for working with the library. */
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. */
result = ctxt.compile ();
ctxt.release ();
if (!result)
{
fprintf (stderr, "NULL result");
return 1;
}
/* Extract the generated code from "result". */
typedef int (*loop_test_fn_type) (int);
loop_test_fn_type loop_test =
(loop_test_fn_type)gcc_jit_result_get_code (result, "loop_test");
if (!loop_test)
{
fprintf (stderr, "NULL loop_test");
gcc_jit_result_release (result);
return 1;
}
/* Run the generated code. */
int val = loop_test (10);
printf("loop_test returned: %d\n", val);
gcc_jit_result_release (result);
return 0;
}
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